Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

301 files changed, 62815 insertions, 0 deletions

diff --git a/vendor/rustix/src/backend/libc/c.rs b/vendor/rustix/src/backend/libc/c.rs
new file mode 100644
index 0000000..d3a1e5f
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/c.rs
@@ -0,0 +1,468 @@
+//! Libc and supplemental types and constants.
+
+#![allow(unused_imports)]
+
+// Import everything from libc, but we'll add some stuff and override some
+// things below.
+pub(crate) use libc::*;
+
+/// `PROC_SUPER_MAGIC`—The magic number for the procfs filesystem.
+#[cfg(all(linux_kernel, target_env = "musl"))]
+pub(crate) const PROC_SUPER_MAGIC: u32 = 0x0000_9fa0;
+
+/// `NFS_SUPER_MAGIC`—The magic number for the NFS filesystem.
+#[cfg(all(linux_kernel, target_env = "musl"))]
+pub(crate) const NFS_SUPER_MAGIC: u32 = 0x0000_6969;
+
+#[cfg(feature = "process")]
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+pub(crate) const EXIT_SIGNALED_SIGABRT: c_int = 128 + SIGABRT as c_int;
+
+// TODO: Upstream these.
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_TSN: c_int = linux_raw_sys::if_ether::ETH_P_TSN as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_ERSPAN2: c_int = linux_raw_sys::if_ether::ETH_P_ERSPAN2 as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_ERSPAN: c_int = linux_raw_sys::if_ether::ETH_P_ERSPAN as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_PROFINET: c_int = linux_raw_sys::if_ether::ETH_P_PROFINET as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_REALTEK: c_int = linux_raw_sys::if_ether::ETH_P_REALTEK as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_ETHERCAT: c_int = linux_raw_sys::if_ether::ETH_P_ETHERCAT as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_PREAUTH: c_int = linux_raw_sys::if_ether::ETH_P_PREAUTH as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_LLDP: c_int = linux_raw_sys::if_ether::ETH_P_LLDP as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_MRP: c_int = linux_raw_sys::if_ether::ETH_P_MRP as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_NCSI: c_int = linux_raw_sys::if_ether::ETH_P_NCSI as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_CFM: c_int = linux_raw_sys::if_ether::ETH_P_CFM as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_IBOE: c_int = linux_raw_sys::if_ether::ETH_P_IBOE as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_HSR: c_int = linux_raw_sys::if_ether::ETH_P_HSR as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_NSH: c_int = linux_raw_sys::if_ether::ETH_P_NSH as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_DSA_8021Q: c_int = linux_raw_sys::if_ether::ETH_P_DSA_8021Q as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_DSA_A5PSW: c_int = linux_raw_sys::if_ether::ETH_P_DSA_A5PSW as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_IFE: c_int = linux_raw_sys::if_ether::ETH_P_IFE as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_CAN: c_int = linux_raw_sys::if_ether::ETH_P_CAN as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_CANXL: c_int = linux_raw_sys::if_ether::ETH_P_CANXL as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_XDSA: c_int = linux_raw_sys::if_ether::ETH_P_XDSA as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_MAP: c_int = linux_raw_sys::if_ether::ETH_P_MAP as _;
+#[cfg(all(linux_kernel, feature = "net"))]
+pub(crate) const ETH_P_MCTP: c_int = linux_raw_sys::if_ether::ETH_P_MCTP as _;
+
+#[cfg(all(
+    linux_kernel,
+    any(
+        target_arch = "mips",
+        target_arch = "mips32r6",
+        target_arch = "mips64",
+        target_arch = "mips64r6",
+        target_arch = "sparc",
+        target_arch = "sparc64"
+    )
+))]
+pub(crate) const SIGEMT: c_int = linux_raw_sys::general::SIGEMT as _;
+
+// TODO: Upstream these.
+#[cfg(all(linux_kernel, feature = "termios"))]
+pub(crate) const IUCLC: tcflag_t = linux_raw_sys::general::IUCLC as _;
+#[cfg(all(linux_kernel, feature = "termios"))]
+pub(crate) const XCASE: tcflag_t = linux_raw_sys::general::XCASE as _;
+
+#[cfg(target_os = "aix")]
+pub(crate) const MSG_DONTWAIT: c_int = libc::MSG_NONBLOCK;
+
+// TODO: Remove once https://github.com/rust-lang/libc/pull/3377 is merged and released.
+#[cfg(target_os = "netbsd")]
+#[cfg(feature = "net")]
+pub(crate) const SO_NOSIGPIPE: c_int = 0x0800;
+
+// On PowerPC, the regular `termios` has the `termios2` fields and there is no
+// `termios2`. linux-raw-sys has aliases `termios2` to `termios` to cover this
+// difference, but we still need to manually import it since `libc` doesn't
+// have this.
+#[cfg(all(
+    linux_kernel,
+    feature = "termios",
+    any(target_arch = "powerpc", target_arch = "powerpc64")
+))]
+pub(crate) use {
+    linux_raw_sys::general::{termios2, CIBAUD},
+    linux_raw_sys::ioctl::{TCGETS2, TCSETS2, TCSETSF2, TCSETSW2},
+};
+
+// Automatically enable “large file” support (LFS) features.
+
+#[cfg(target_os = "vxworks")]
+pub(super) use libc::_Vx_ticks64_t as _Vx_ticks_t;
+#[cfg(linux_kernel)]
+pub(super) use libc::fallocate64 as fallocate;
+#[cfg(not(any(target_arch = "aarch64", target_arch = "riscv64")))]
+#[cfg(any(linux_like, target_os = "aix"))]
+pub(super) use libc::open64 as open;
+#[cfg(any(
+    linux_kernel,
+    target_os = "aix",
+    target_os = "hurd",
+    target_os = "l4re"
+))]
+pub(super) use libc::posix_fallocate64 as posix_fallocate;
+#[cfg(any(all(linux_like, not(target_os = "android")), target_os = "aix"))]
+pub(super) use libc::{blkcnt64_t as blkcnt_t, rlim64_t as rlim_t};
+// TODO: AIX has `stat64x`, `fstat64x`, `lstat64x`, and `stat64xat`; add them
+// to the upstream libc crate and implement rustix's `statat` etc. with them.
+#[cfg(target_os = "aix")]
+pub(super) use libc::{
+    blksize64_t as blksize_t, fstat64 as fstat, fstatfs64 as fstatfs, fstatvfs64 as fstatvfs,
+    ftruncate64 as ftruncate, getrlimit64 as getrlimit, ino_t, lseek64 as lseek, mmap,
+    off64_t as off_t, openat, posix_fadvise64 as posix_fadvise, preadv, pwritev,
+    rlimit64 as rlimit, setrlimit64 as setrlimit, stat64at as fstatat, statfs64 as statfs,
+    statvfs64 as statvfs, RLIM_INFINITY,
+};
+#[cfg(any(linux_like, target_os = "hurd"))]
+pub(super) use libc::{
+    fstat64 as fstat, fstatat64 as fstatat, fstatfs64 as fstatfs, fstatvfs64 as fstatvfs,
+    ftruncate64 as ftruncate, getrlimit64 as getrlimit, ino64_t as ino_t, lseek64 as lseek,
+    mmap64 as mmap, off64_t as off_t, openat64 as openat, posix_fadvise64 as posix_fadvise,
+    rlimit64 as rlimit, setrlimit64 as setrlimit, statfs64 as statfs, statvfs64 as statvfs,
+    RLIM64_INFINITY as RLIM_INFINITY,
+};
+#[cfg(apple)]
+pub(super) use libc::{
+    host_info64_t as host_info_t, host_statistics64 as host_statistics,
+    vm_statistics64_t as vm_statistics_t,
+};
+#[cfg(not(all(
+    linux_kernel,
+    any(
+        target_pointer_width = "32",
+        target_arch = "mips64",
+        target_arch = "mips64r6"
+    )
+)))]
+#[cfg(any(linux_like, target_os = "aix", target_os = "hurd"))]
+pub(super) use libc::{lstat64 as lstat, stat64 as stat};
+#[cfg(any(
+    linux_kernel,
+    target_os = "aix",
+    target_os = "hurd",
+    target_os = "emscripten"
+))]
+pub(super) use libc::{pread64 as pread, pwrite64 as pwrite};
+#[cfg(any(target_os = "linux", target_os = "hurd", target_os = "emscripten"))]
+pub(super) use libc::{preadv64 as preadv, pwritev64 as pwritev};
+
+#[cfg(all(target_os = "linux", target_env = "gnu"))]
+pub(super) unsafe fn prlimit(
+    pid: libc::pid_t,
+    resource: libc::__rlimit_resource_t,
+    new_limit: *const libc::rlimit64,
+    old_limit: *mut libc::rlimit64,
+) -> libc::c_int {
+    // `prlimit64` wasn't supported in glibc until 2.13.
+    weak_or_syscall! {
+        fn prlimit64(
+            pid: libc::pid_t,
+            resource: libc::__rlimit_resource_t,
+            new_limit: *const libc::rlimit64,
+            old_limit: *mut libc::rlimit64
+        ) via SYS_prlimit64 -> libc::c_int
+    }
+
+    prlimit64(pid, resource, new_limit, old_limit)
+}
+
+#[cfg(all(target_os = "linux", target_env = "musl"))]
+pub(super) unsafe fn prlimit(
+    pid: libc::pid_t,
+    resource: libc::c_int,
+    new_limit: *const libc::rlimit64,
+    old_limit: *mut libc::rlimit64,
+) -> libc::c_int {
+    weak_or_syscall! {
+        fn prlimit64(
+            pid: libc::pid_t,
+            resource: libc::c_int,
+            new_limit: *const libc::rlimit64,
+            old_limit: *mut libc::rlimit64
+        ) via SYS_prlimit64 -> libc::c_int
+    }
+
+    prlimit64(pid, resource, new_limit, old_limit)
+}
+
+#[cfg(target_os = "android")]
+pub(super) unsafe fn prlimit(
+    pid: libc::pid_t,
+    resource: libc::c_int,
+    new_limit: *const libc::rlimit64,
+    old_limit: *mut libc::rlimit64,
+) -> libc::c_int {
+    weak_or_syscall! {
+        fn prlimit64(
+            pid: libc::pid_t,
+            resource: libc::c_int,
+            new_limit: *const libc::rlimit64,
+            old_limit: *mut libc::rlimit64
+        ) via SYS_prlimit64 -> libc::c_int
+    }
+
+    prlimit64(pid, resource, new_limit, old_limit)
+}
+
+#[cfg(target_os = "android")]
+mod readwrite_pv64 {
+    use super::*;
+
+    pub(in super::super) unsafe fn preadv64(
+        fd: libc::c_int,
+        iov: *const libc::iovec,
+        iovcnt: libc::c_int,
+        offset: libc::off64_t,
+    ) -> libc::ssize_t {
+        // Older Android libc lacks `preadv64`, so use the `weak!` mechanism to
+        // test for it, and call back to `libc::syscall`. We don't use
+        // `weak_or_syscall` here because we need to pass the 64-bit offset
+        // specially.
+        weak! {
+            fn preadv64(libc::c_int, *const libc::iovec, libc::c_int, libc::off64_t) -> libc::ssize_t
+        }
+        if let Some(fun) = preadv64.get() {
+            fun(fd, iov, iovcnt, offset)
+        } else {
+            // Unlike the plain "p" functions, the "pv" functions pass their
+            // offset in an endian-independent way, and always in two registers.
+            syscall! {
+                fn preadv(
+                    fd: libc::c_int,
+                    iov: *const libc::iovec,
+                    iovcnt: libc::c_int,
+                    offset_lo: usize,
+                    offset_hi: usize
+                ) via SYS_preadv -> libc::ssize_t
+            }
+            preadv(fd, iov, iovcnt, offset as usize, (offset >> 32) as usize)
+        }
+    }
+    pub(in super::super) unsafe fn pwritev64(
+        fd: libc::c_int,
+        iov: *const libc::iovec,
+        iovcnt: libc::c_int,
+        offset: libc::off64_t,
+    ) -> libc::ssize_t {
+        // See the comments in `preadv64`.
+        weak! {
+            fn pwritev64(libc::c_int, *const libc::iovec, libc::c_int, libc::off64_t) -> libc::ssize_t
+        }
+        if let Some(fun) = pwritev64.get() {
+            fun(fd, iov, iovcnt, offset)
+        } else {
+            // Unlike the plain "p" functions, the "pv" functions pass their
+            // offset in an endian-independent way, and always in two registers.
+            syscall! {
+                fn pwritev(
+                    fd: libc::c_int,
+                    iov: *const libc::iovec,
+                    iovcnt: libc::c_int,
+                    offset_lo: usize,
+                    offset_hi: usize
+                ) via SYS_pwritev -> libc::ssize_t
+            }
+            pwritev(fd, iov, iovcnt, offset as usize, (offset >> 32) as usize)
+        }
+    }
+}
+#[cfg(target_os = "android")]
+pub(super) use readwrite_pv64::{preadv64 as preadv, pwritev64 as pwritev};
+
+// macOS added `preadv` and `pwritev` in version 11.0.
+#[cfg(apple)]
+mod readwrite_pv {
+    weakcall! {
+        pub(in super::super) fn preadv(
+            fd: libc::c_int,
+            iov: *const libc::iovec,
+            iovcnt: libc::c_int,
+            offset: libc::off_t
+        ) -> libc::ssize_t
+    }
+    weakcall! {
+        pub(in super::super) fn pwritev(
+            fd: libc::c_int,
+            iov: *const libc::iovec,
+            iovcnt: libc::c_int, offset: libc::off_t
+        ) -> libc::ssize_t
+    }
+}
+#[cfg(apple)]
+pub(super) use readwrite_pv::{preadv, pwritev};
+
+// glibc added `preadv64v2` and `pwritev64v2` in version 2.26.
+#[cfg(all(target_os = "linux", target_env = "gnu"))]
+mod readwrite_pv64v2 {
+    use super::*;
+
+    pub(in super::super) unsafe fn preadv64v2(
+        fd: libc::c_int,
+        iov: *const libc::iovec,
+        iovcnt: libc::c_int,
+        offset: libc::off64_t,
+        flags: libc::c_int,
+    ) -> libc::ssize_t {
+        // Older glibc lacks `preadv64v2`, so use the `weak!` mechanism to
+        // test for it, and call back to `libc::syscall`. We don't use
+        // `weak_or_syscall` here because we need to pass the 64-bit offset
+        // specially.
+        weak! {
+            fn preadv64v2(libc::c_int, *const libc::iovec, libc::c_int, libc::off64_t, libc::c_int) -> libc::ssize_t
+        }
+        if let Some(fun) = preadv64v2.get() {
+            fun(fd, iov, iovcnt, offset, flags)
+        } else {
+            // Unlike the plain "p" functions, the "pv" functions pass their
+            // offset in an endian-independent way, and always in two registers.
+            syscall! {
+                fn preadv2(
+                    fd: libc::c_int,
+                    iov: *const libc::iovec,
+                    iovcnt: libc::c_int,
+                    offset_lo: usize,
+                    offset_hi: usize,
+                    flags: libc::c_int
+                ) via SYS_preadv2 -> libc::ssize_t
+            }
+            preadv2(
+                fd,
+                iov,
+                iovcnt,
+                offset as usize,
+                (offset >> 32) as usize,
+                flags,
+            )
+        }
+    }
+    pub(in super::super) unsafe fn pwritev64v2(
+        fd: libc::c_int,
+        iov: *const libc::iovec,
+        iovcnt: libc::c_int,
+        offset: libc::off64_t,
+        flags: libc::c_int,
+    ) -> libc::ssize_t {
+        // See the comments in `preadv64v2`.
+        weak! {
+            fn pwritev64v2(libc::c_int, *const libc::iovec, libc::c_int, libc::off64_t, libc::c_int) -> libc::ssize_t
+        }
+        if let Some(fun) = pwritev64v2.get() {
+            fun(fd, iov, iovcnt, offset, flags)
+        } else {
+            // Unlike the plain "p" functions, the "pv" functions pass their
+            // offset in an endian-independent way, and always in two registers.
+            syscall! {
+                fn pwritev2(
+                    fd: libc::c_int,
+                    iov: *const libc::iovec,
+                    iovec: libc::c_int,
+                    offset_lo: usize,
+                    offset_hi: usize,
+                    flags: libc::c_int
+                ) via SYS_pwritev2 -> libc::ssize_t
+            }
+            pwritev2(
+                fd,
+                iov,
+                iovcnt,
+                offset as usize,
+                (offset >> 32) as usize,
+                flags,
+            )
+        }
+    }
+}
+#[cfg(all(target_os = "linux", target_env = "gnu"))]
+pub(super) use readwrite_pv64v2::{preadv64v2 as preadv2, pwritev64v2 as pwritev2};
+
+// On non-glibc, assume we don't have `pwritev2`/`preadv2` in libc and use
+// `c::syscall` instead.
+#[cfg(any(
+    target_os = "android",
+    all(target_os = "linux", not(target_env = "gnu")),
+))]
+mod readwrite_pv64v2 {
+    use super::*;
+
+    pub(in super::super) unsafe fn preadv64v2(
+        fd: libc::c_int,
+        iov: *const libc::iovec,
+        iovcnt: libc::c_int,
+        offset: libc::off64_t,
+        flags: libc::c_int,
+    ) -> libc::ssize_t {
+        // Unlike the plain "p" functions, the "pv" functions pass their offset
+        // in an endian-independent way, and always in two registers.
+        syscall! {
+            fn preadv2(
+                fd: libc::c_int,
+                iov: *const libc::iovec,
+                iovcnt: libc::c_int,
+                offset_lo: usize,
+                offset_hi: usize,
+                flags: libc::c_int
+            ) via SYS_preadv2 -> libc::ssize_t
+        }
+        preadv2(
+            fd,
+            iov,
+            iovcnt,
+            offset as usize,
+            (offset >> 32) as usize,
+            flags,
+        )
+    }
+    pub(in super::super) unsafe fn pwritev64v2(
+        fd: libc::c_int,
+        iov: *const libc::iovec,
+        iovcnt: libc::c_int,
+        offset: libc::off64_t,
+        flags: libc::c_int,
+    ) -> libc::ssize_t {
+        // Unlike the plain "p" functions, the "pv" functions pass their offset
+        // in an endian-independent way, and always in two registers.
+        syscall! {
+            fn pwritev2(
+                fd: libc::c_int,
+                iov: *const libc::iovec,
+                iovcnt: libc::c_int,
+                offset_lo: usize,
+                offset_hi: usize,
+                flags: libc::c_int
+            ) via SYS_pwritev2 -> libc::ssize_t
+        }
+        pwritev2(
+            fd,
+            iov,
+            iovcnt,
+            offset as usize,
+            (offset >> 32) as usize,
+            flags,
+        )
+    }
+}
+#[cfg(any(
+    target_os = "android",
+    all(target_os = "linux", not(target_env = "gnu")),
+))]
+pub(super) use readwrite_pv64v2::{preadv64v2 as preadv2, pwritev64v2 as pwritev2};
diff --git a/vendor/rustix/src/backend/libc/conv.rs b/vendor/rustix/src/backend/libc/conv.rs
new file mode 100644
index 0000000..2539510
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/conv.rs
@@ -0,0 +1,247 @@
+//! Libc call arguments and return values are often things like `c_int`,
+//! `c_uint`, or libc-specific pointer types. This module provides functions
+//! for converting between rustix's types and libc types.
+
+use super::c;
+#[cfg(all(feature = "alloc", not(any(windows, target_os = "espidf"))))]
+use super::fd::IntoRawFd;
+use super::fd::{AsRawFd, BorrowedFd, FromRawFd, LibcFd, OwnedFd, RawFd};
+#[cfg(not(windows))]
+use crate::ffi::CStr;
+use crate::io;
+
+#[cfg(not(windows))]
+#[inline]
+pub(super) fn c_str(c: &CStr) -> *const c::c_char {
+    c.as_ptr()
+}
+
+#[cfg(not(any(windows, target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+#[inline]
+pub(super) fn no_fd() -> LibcFd {
+    -1
+}
+
+#[inline]
+pub(super) fn borrowed_fd(fd: BorrowedFd<'_>) -> LibcFd {
+    fd.as_raw_fd() as LibcFd
+}
+
+#[cfg(all(
+    feature = "alloc",
+    not(any(windows, target_os = "espidf", target_os = "redox"))
+))]
+#[inline]
+pub(super) fn owned_fd(fd: OwnedFd) -> LibcFd {
+    fd.into_raw_fd() as LibcFd
+}
+
+#[inline]
+pub(super) fn ret(raw: c::c_int) -> io::Result<()> {
+    if raw == 0 {
+        Ok(())
+    } else {
+        Err(io::Errno::last_os_error())
+    }
+}
+
+#[cfg(apple)]
+#[inline]
+pub(super) fn nonnegative_ret(raw: c::c_int) -> io::Result<()> {
+    if raw >= 0 {
+        Ok(())
+    } else {
+        Err(io::Errno::last_os_error())
+    }
+}
+
+#[cfg(not(any(windows, target_os = "wasi")))]
+#[inline]
+pub(super) unsafe fn ret_infallible(raw: c::c_int) {
+    debug_assert_eq!(raw, 0, "unexpected error: {:?}", io::Errno::last_os_error());
+}
+
+#[inline]
+pub(super) fn ret_c_int(raw: c::c_int) -> io::Result<c::c_int> {
+    if raw == -1 {
+        Err(io::Errno::last_os_error())
+    } else {
+        Ok(raw)
+    }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(super) fn ret_u32(raw: c::c_int) -> io::Result<u32> {
+    if raw == -1 {
+        Err(io::Errno::last_os_error())
+    } else {
+        Ok(raw as u32)
+    }
+}
+
+#[inline]
+pub(super) fn ret_usize(raw: c::ssize_t) -> io::Result<usize> {
+    if raw == -1 {
+        Err(io::Errno::last_os_error())
+    } else {
+        debug_assert!(raw >= 0);
+        Ok(raw as usize)
+    }
+}
+
+#[cfg(not(windows))]
+#[cfg(feature = "fs")]
+#[inline]
+pub(super) fn ret_off_t(raw: c::off_t) -> io::Result<c::off_t> {
+    if raw == -1 {
+        Err(io::Errno::last_os_error())
+    } else {
+        Ok(raw)
+    }
+}
+
+#[cfg(not(any(windows, target_os = "wasi")))]
+#[inline]
+pub(super) fn ret_pid_t(raw: c::pid_t) -> io::Result<c::pid_t> {
+    if raw == -1 {
+        Err(io::Errno::last_os_error())
+    } else {
+        Ok(raw)
+    }
+}
+
+/// Convert a `c_int` returned from a libc function to an `OwnedFd`, if valid.
+///
+/// # Safety
+///
+/// The caller must ensure that this is the return value of a libc function
+/// which returns an owned file descriptor.
+#[inline]
+pub(super) unsafe fn ret_owned_fd(raw: LibcFd) -> io::Result<OwnedFd> {
+    if raw == !0 {
+        Err(io::Errno::last_os_error())
+    } else {
+        Ok(OwnedFd::from_raw_fd(raw as RawFd))
+    }
+}
+
+#[cfg(not(any(windows, target_os = "wasi")))]
+#[inline]
+pub(super) fn ret_discarded_fd(raw: LibcFd) -> io::Result<()> {
+    if raw == !0 {
+        Err(io::Errno::last_os_error())
+    } else {
+        Ok(())
+    }
+}
+
+#[cfg(all(feature = "alloc", not(any(windows, target_os = "wasi"))))]
+#[inline]
+pub(super) fn ret_discarded_char_ptr(raw: *mut c::c_char) -> io::Result<()> {
+    if raw.is_null() {
+        Err(io::Errno::last_os_error())
+    } else {
+        Ok(())
+    }
+}
+
+/// Convert the buffer-length argument value of a `send` or `recv` call.
+#[cfg(not(any(windows, target_os = "redox", target_os = "wasi")))]
+#[inline]
+pub(super) fn send_recv_len(len: usize) -> usize {
+    len
+}
+
+/// Convert the buffer-length argument value of a `send` or `recv` call.
+#[cfg(windows)]
+#[inline]
+pub(super) fn send_recv_len(len: usize) -> i32 {
+    // On Windows, the length argument has type `i32`; saturate the length,
+    // since `send` and `recv` are allowed to send and recv less data than
+    // requested.
+    len.try_into().unwrap_or(i32::MAX)
+}
+
+/// Convert the return value of a `send` or `recv` call.
+#[cfg(not(any(windows, target_os = "redox", target_os = "wasi")))]
+#[inline]
+pub(super) fn ret_send_recv(len: isize) -> io::Result<usize> {
+    ret_usize(len)
+}
+
+/// Convert the return value of a `send` or `recv` call.
+#[cfg(windows)]
+#[inline]
+pub(super) fn ret_send_recv(len: i32) -> io::Result<usize> {
+    ret_usize(len as isize)
+}
+
+/// Convert the value to the `msg_iovlen` field of a `msghdr` struct.
+#[cfg(all(
+    not(any(windows, target_os = "espidf", target_os = "redox", target_os = "wasi")),
+    any(
+        target_os = "android",
+        all(target_os = "linux", not(target_env = "musl"))
+    )
+))]
+#[inline]
+pub(super) fn msg_iov_len(len: usize) -> c::size_t {
+    len
+}
+
+/// Convert the value to the `msg_iovlen` field of a `msghdr` struct.
+#[cfg(all(
+    not(any(
+        windows,
+        target_os = "espidf",
+        target_os = "redox",
+        target_os = "vita",
+        target_os = "wasi"
+    )),
+    not(any(
+        target_os = "android",
+        all(target_os = "linux", not(target_env = "musl"))
+    ))
+))]
+#[inline]
+pub(crate) fn msg_iov_len(len: usize) -> c::c_int {
+    len.try_into().unwrap_or(c::c_int::MAX)
+}
+
+/// Convert the value to a `socklen_t`.
+#[cfg(any(
+    bsd,
+    solarish,
+    target_env = "musl",
+    target_os = "aix",
+    target_os = "emscripten",
+    target_os = "fuchsia",
+    target_os = "haiku",
+    target_os = "nto",
+))]
+#[inline]
+pub(crate) fn msg_control_len(len: usize) -> c::socklen_t {
+    len.try_into().unwrap_or(c::socklen_t::MAX)
+}
+
+/// Convert the value to a `size_t`.
+#[cfg(not(any(
+    bsd,
+    solarish,
+    windows,
+    target_env = "musl",
+    target_os = "aix",
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+#[inline]
+pub(crate) fn msg_control_len(len: usize) -> c::size_t {
+    len
+}
diff --git a/vendor/rustix/src/backend/libc/event/epoll.rs b/vendor/rustix/src/backend/libc/event/epoll.rs
new file mode 100644
index 0000000..ced3be1
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/event/epoll.rs
@@ -0,0 +1,496 @@
+//! Linux `epoll` support.
+//!
+//! # Examples
+//!
+//! ```no_run
+//! # #[cfg(feature = "net")]
+//! # fn main() -> std::io::Result<()> {
+//! use rustix::event::epoll;
+//! use rustix::fd::AsFd;
+//! use rustix::io::{ioctl_fionbio, read, write};
+//! use rustix::net::{
+//!     accept, bind_v4, listen, socket, AddressFamily, Ipv4Addr, SocketAddrV4, SocketType,
+//! };
+//! use std::collections::HashMap;
+//! use std::os::unix::io::AsRawFd;
+//!
+//! // Create a socket and listen on it.
+//! let listen_sock = socket(AddressFamily::INET, SocketType::STREAM, None)?;
+//! bind_v4(&listen_sock, &SocketAddrV4::new(Ipv4Addr::LOCALHOST, 0))?;
+//! listen(&listen_sock, 1)?;
+//!
+//! // Create an epoll object. Using `Owning` here means the epoll object will
+//! // take ownership of the file descriptors registered with it.
+//! let epoll = epoll::create(epoll::CreateFlags::CLOEXEC)?;
+//!
+//! // Register the socket with the epoll object.
+//! epoll::add(
+//!     &epoll,
+//!     &listen_sock,
+//!     epoll::EventData::new_u64(1),
+//!     epoll::EventFlags::IN,
+//! )?;
+//!
+//! // Keep track of the sockets we've opened.
+//! let mut next_id = epoll::EventData::new_u64(2);
+//! let mut sockets = HashMap::new();
+//!
+//! // Process events.
+//! let mut event_list = epoll::EventVec::with_capacity(4);
+//! loop {
+//!     epoll::wait(&epoll, &mut event_list, -1)?;
+//!     for event in &event_list {
+//!         let target = event.data;
+//!         if target.u64() == 1 {
+//!             // Accept a new connection, set it to non-blocking, and
+//!             // register to be notified when it's ready to write to.
+//!             let conn_sock = accept(&listen_sock)?;
+//!             ioctl_fionbio(&conn_sock, true)?;
+//!             epoll::add(
+//!                 &epoll,
+//!                 &conn_sock,
+//!                 next_id,
+//!                 epoll::EventFlags::OUT | epoll::EventFlags::ET,
+//!             )?;
+//!
+//!             // Keep track of the socket.
+//!             sockets.insert(next_id, conn_sock);
+//!             next_id = epoll::EventData::new_u64(next_id.u64() + 1);
+//!         } else {
+//!             // Write a message to the stream and then unregister it.
+//!             let target = sockets.remove(&target).unwrap();
+//!             write(&target, b"hello\n")?;
+//!             let _ = epoll::delete(&epoll, &target)?;
+//!         }
+//!     }
+//! }
+//! # }
+//! # #[cfg(not(feature = "net"))]
+//! # fn main() {}
+//! ```
+
+use crate::backend::c;
+#[cfg(feature = "alloc")]
+use crate::backend::conv::ret_u32;
+use crate::backend::conv::{ret, ret_owned_fd};
+use crate::fd::{AsFd, AsRawFd, OwnedFd};
+use crate::io;
+use crate::utils::as_mut_ptr;
+#[cfg(feature = "alloc")]
+use alloc::vec::Vec;
+use bitflags::bitflags;
+use core::ffi::c_void;
+use core::hash::{Hash, Hasher};
+use core::ptr::null_mut;
+use core::slice;
+
+bitflags! {
+    /// `EPOLL_*` for use with [`new`].
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct CreateFlags: u32 {
+        /// `EPOLL_CLOEXEC`
+        const CLOEXEC = bitcast!(c::EPOLL_CLOEXEC);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `EPOLL*` for use with [`add`].
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct EventFlags: u32 {
+        /// `EPOLLIN`
+        const IN = bitcast!(c::EPOLLIN);
+
+        /// `EPOLLOUT`
+        const OUT = bitcast!(c::EPOLLOUT);
+
+        /// `EPOLLPRI`
+        const PRI = bitcast!(c::EPOLLPRI);
+
+        /// `EPOLLERR`
+        const ERR = bitcast!(c::EPOLLERR);
+
+        /// `EPOLLHUP`
+        const HUP = bitcast!(c::EPOLLHUP);
+
+        /// `EPOLLRDNORM`
+        const RDNORM = bitcast!(c::EPOLLRDNORM);
+
+        /// `EPOLLRDBAND`
+        const RDBAND = bitcast!(c::EPOLLRDBAND);
+
+        /// `EPOLLWRNORM`
+        const WRNORM = bitcast!(c::EPOLLWRNORM);
+
+        /// `EPOLLWRBAND`
+        const WRBAND = bitcast!(c::EPOLLWRBAND);
+
+        /// `EPOLLMSG`
+        const MSG = bitcast!(c::EPOLLMSG);
+
+        /// `EPOLLRDHUP`
+        const RDHUP = bitcast!(c::EPOLLRDHUP);
+
+        /// `EPOLLET`
+        const ET = bitcast!(c::EPOLLET);
+
+        /// `EPOLLONESHOT`
+        const ONESHOT = bitcast!(c::EPOLLONESHOT);
+
+        /// `EPOLLWAKEUP`
+        const WAKEUP = bitcast!(c::EPOLLWAKEUP);
+
+        /// `EPOLLEXCLUSIVE`
+        #[cfg(not(target_os = "android"))]
+        const EXCLUSIVE = bitcast!(c::EPOLLEXCLUSIVE);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `epoll_create1(flags)`—Creates a new epoll object.
+///
+/// Use the [`CreateFlags::CLOEXEC`] flag to prevent the resulting file
+/// descriptor from being implicitly passed across `exec` boundaries.
+#[inline]
+#[doc(alias = "epoll_create1")]
+pub fn create(flags: CreateFlags) -> io::Result<OwnedFd> {
+    // SAFETY: We're calling `epoll_create1` via FFI and we know how it
+    // behaves.
+    unsafe { ret_owned_fd(c::epoll_create1(bitflags_bits!(flags))) }
+}
+
+/// `epoll_ctl(self, EPOLL_CTL_ADD, data, event)`—Adds an element to an epoll
+/// object.
+///
+/// This registers interest in any of the events set in `events` occurring on
+/// the file descriptor associated with `data`.
+///
+/// If [`delete`] is not called on the I/O source passed into this function
+/// before the I/O source is `close`d, then the `epoll` will act as if the I/O
+/// source is still registered with it. This can lead to spurious events being
+/// returned from [`wait`]. If a file descriptor is an
+/// `Arc<dyn SystemResource>`, then `epoll` can be thought to maintain a
+/// `Weak<dyn SystemResource>` to the file descriptor.
+#[doc(alias = "epoll_ctl")]
+pub fn add(
+    epoll: impl AsFd,
+    source: impl AsFd,
+    data: EventData,
+    event_flags: EventFlags,
+) -> io::Result<()> {
+    // SAFETY: We're calling `epoll_ctl` via FFI and we know how it
+    // behaves. We use our own `Event` struct instead of libc's because
+    // ours preserves pointer provenance instead of just using a `u64`,
+    // and we have tests elsehwere for layout equivalence.
+    unsafe {
+        let raw_fd = source.as_fd().as_raw_fd();
+        ret(c::epoll_ctl(
+            epoll.as_fd().as_raw_fd(),
+            c::EPOLL_CTL_ADD,
+            raw_fd,
+            as_mut_ptr(&mut Event {
+                flags: event_flags,
+                data,
+            })
+            .cast(),
+        ))
+    }
+}
+
+/// `epoll_ctl(self, EPOLL_CTL_MOD, target, event)`—Modifies an element in a
+/// given epoll object.
+///
+/// This sets the events of interest with `target` to `events`.
+#[doc(alias = "epoll_ctl")]
+pub fn modify(
+    epoll: impl AsFd,
+    source: impl AsFd,
+    data: EventData,
+    event_flags: EventFlags,
+) -> io::Result<()> {
+    let raw_fd = source.as_fd().as_raw_fd();
+
+    // SAFETY: We're calling `epoll_ctl` via FFI and we know how it
+    // behaves. We use our own `Event` struct instead of libc's because
+    // ours preserves pointer provenance instead of just using a `u64`,
+    // and we have tests elsehwere for layout equivalence.
+    unsafe {
+        ret(c::epoll_ctl(
+            epoll.as_fd().as_raw_fd(),
+            c::EPOLL_CTL_MOD,
+            raw_fd,
+            as_mut_ptr(&mut Event {
+                flags: event_flags,
+                data,
+            })
+            .cast(),
+        ))
+    }
+}
+
+/// `epoll_ctl(self, EPOLL_CTL_DEL, target, NULL)`—Removes an element in a
+/// given epoll object.
+#[doc(alias = "epoll_ctl")]
+pub fn delete(epoll: impl AsFd, source: impl AsFd) -> io::Result<()> {
+    // SAFETY: We're calling `epoll_ctl` via FFI and we know how it
+    // behaves.
+    unsafe {
+        let raw_fd = source.as_fd().as_raw_fd();
+        ret(c::epoll_ctl(
+            epoll.as_fd().as_raw_fd(),
+            c::EPOLL_CTL_DEL,
+            raw_fd,
+            null_mut(),
+        ))
+    }
+}
+
+/// `epoll_wait(self, events, timeout)`—Waits for registered events of
+/// interest.
+///
+/// For each event of interest, an element is written to `events`. On
+/// success, this returns the number of written elements.
+#[cfg(feature = "alloc")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
+pub fn wait(epoll: impl AsFd, event_list: &mut EventVec, timeout: c::c_int) -> io::Result<()> {
+    // SAFETY: We're calling `epoll_wait` via FFI and we know how it
+    // behaves.
+    unsafe {
+        event_list.events.set_len(0);
+        let nfds = ret_u32(c::epoll_wait(
+            epoll.as_fd().as_raw_fd(),
+            event_list.events.as_mut_ptr().cast::<c::epoll_event>(),
+            event_list.events.capacity().try_into().unwrap_or(i32::MAX),
+            timeout,
+        ))?;
+        event_list.events.set_len(nfds as usize);
+    }
+
+    Ok(())
+}
+
+/// An iterator over the `Event`s in an `EventVec`.
+pub struct Iter<'a> {
+    /// Use `Copied` to copy the struct, since `Event` is `packed` on some
+    /// platforms, and it's common for users to directly destructure it, which
+    /// would lead to errors about forming references to packed fields.
+    iter: core::iter::Copied<slice::Iter<'a, Event>>,
+}
+
+impl<'a> Iterator for Iter<'a> {
+    type Item = Event;
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next()
+    }
+}
+
+/// A record of an event that occurred.
+#[repr(C)]
+#[cfg_attr(
+    any(
+        all(
+            target_arch = "x86",
+            not(target_env = "musl"),
+            not(target_os = "android"),
+        ),
+        target_arch = "x86_64",
+    ),
+    repr(packed)
+)]
+#[derive(Copy, Clone, Eq, PartialEq, Hash)]
+pub struct Event {
+    /// Which specific event(s) occurred.
+    pub flags: EventFlags,
+    /// User data.
+    pub data: EventData,
+}
+
+/// Data associated with an [`Event`]. This can either be a 64-bit integer
+/// value or a pointer which preserves pointer provenance.
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub union EventData {
+    /// A 64-bit integer value.
+    as_u64: u64,
+
+    /// A `*mut c_void` which preserves pointer provenance, extended to be
+    /// 64-bit so that if we read the value as a `u64` union field, we don't
+    /// get uninitialized memory.
+    sixty_four_bit_pointer: SixtyFourBitPointer,
+}
+
+impl EventData {
+    /// Construct a new value containing a `u64`.
+    #[inline]
+    pub const fn new_u64(value: u64) -> Self {
+        Self { as_u64: value }
+    }
+
+    /// Construct a new value containing a `*mut c_void`.
+    #[inline]
+    pub const fn new_ptr(value: *mut c_void) -> Self {
+        Self {
+            sixty_four_bit_pointer: SixtyFourBitPointer {
+                pointer: value,
+                #[cfg(target_pointer_width = "32")]
+                _padding: 0,
+            },
+        }
+    }
+
+    /// Return the value as a `u64`.
+    ///
+    /// If the stored value was a pointer, the pointer is zero-extended to a
+    /// `u64`.
+    #[inline]
+    pub fn u64(self) -> u64 {
+        unsafe { self.as_u64 }
+    }
+
+    /// Return the value as a `*mut c_void`.
+    ///
+    /// If the stored value was a `u64`, the least-significant bits of the
+    /// `u64` are returned as a pointer value.
+    #[inline]
+    pub fn ptr(self) -> *mut c_void {
+        unsafe { self.sixty_four_bit_pointer.pointer }
+    }
+}
+
+impl PartialEq for EventData {
+    #[inline]
+    fn eq(&self, other: &Self) -> bool {
+        self.u64() == other.u64()
+    }
+}
+
+impl Eq for EventData {}
+
+impl Hash for EventData {
+    #[inline]
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.u64().hash(state)
+    }
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+struct SixtyFourBitPointer {
+    #[cfg(target_endian = "big")]
+    #[cfg(target_pointer_width = "32")]
+    _padding: u32,
+
+    pointer: *mut c_void,
+
+    #[cfg(target_endian = "little")]
+    #[cfg(target_pointer_width = "32")]
+    _padding: u32,
+}
+
+/// A vector of `Event`s, plus context for interpreting them.
+#[cfg(feature = "alloc")]
+pub struct EventVec {
+    events: Vec<Event>,
+}
+
+#[cfg(feature = "alloc")]
+impl EventVec {
+    /// Constructs an `EventVec` from raw pointer, length, and capacity.
+    ///
+    /// # Safety
+    ///
+    /// This function calls [`Vec::from_raw_parts`] with its arguments.
+    ///
+    /// [`Vec::from_raw_parts`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.from_raw_parts
+    #[inline]
+    pub unsafe fn from_raw_parts(ptr: *mut Event, len: usize, capacity: usize) -> Self {
+        Self {
+            events: Vec::from_raw_parts(ptr, len, capacity),
+        }
+    }
+
+    /// Constructs an `EventVec` with memory for `capacity` `Event`s.
+    #[inline]
+    pub fn with_capacity(capacity: usize) -> Self {
+        Self {
+            events: Vec::with_capacity(capacity),
+        }
+    }
+
+    /// Returns the current `Event` capacity of this `EventVec`.
+    #[inline]
+    pub fn capacity(&self) -> usize {
+        self.events.capacity()
+    }
+
+    /// Reserves enough memory for at least `additional` more `Event`s.
+    #[inline]
+    pub fn reserve(&mut self, additional: usize) {
+        self.events.reserve(additional);
+    }
+
+    /// Reserves enough memory for exactly `additional` more `Event`s.
+    #[inline]
+    pub fn reserve_exact(&mut self, additional: usize) {
+        self.events.reserve_exact(additional);
+    }
+
+    /// Clears all the `Events` out of this `EventVec`.
+    #[inline]
+    pub fn clear(&mut self) {
+        self.events.clear();
+    }
+
+    /// Shrinks the capacity of this `EventVec` as much as possible.
+    #[inline]
+    pub fn shrink_to_fit(&mut self) {
+        self.events.shrink_to_fit();
+    }
+
+    /// Returns an iterator over the `Event`s in this `EventVec`.
+    #[inline]
+    pub fn iter(&self) -> Iter<'_> {
+        Iter {
+            iter: self.events.iter().copied(),
+        }
+    }
+
+    /// Returns the number of `Event`s logically contained in this `EventVec`.
+    #[inline]
+    pub fn len(&mut self) -> usize {
+        self.events.len()
+    }
+
+    /// Tests whether this `EventVec` is logically empty.
+    #[inline]
+    pub fn is_empty(&mut self) -> bool {
+        self.events.is_empty()
+    }
+}
+
+#[cfg(feature = "alloc")]
+impl<'a> IntoIterator for &'a EventVec {
+    type IntoIter = Iter<'a>;
+    type Item = Event;
+
+    #[inline]
+    fn into_iter(self) -> Self::IntoIter {
+        self.iter()
+    }
+}
+
+#[test]
+fn test_epoll_layouts() {
+    check_renamed_type!(Event, epoll_event);
+    check_renamed_type!(Event, epoll_event);
+    check_renamed_struct_renamed_field!(Event, epoll_event, flags, events);
+    check_renamed_struct_renamed_field!(Event, epoll_event, data, u64);
+}
diff --git a/vendor/rustix/src/backend/libc/event/mod.rs b/vendor/rustix/src/backend/libc/event/mod.rs
new file mode 100644
index 0000000..6aed461
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/event/mod.rs
@@ -0,0 +1,9 @@
+pub(crate) mod poll_fd;
+#[cfg(not(windows))]
+pub(crate) mod types;
+
+#[cfg_attr(windows, path = "windows_syscalls.rs")]
+pub(crate) mod syscalls;
+
+#[cfg(linux_kernel)]
+pub mod epoll;
diff --git a/vendor/rustix/src/backend/libc/event/poll_fd.rs b/vendor/rustix/src/backend/libc/event/poll_fd.rs
new file mode 100644
index 0000000..32fd83d
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/event/poll_fd.rs
@@ -0,0 +1,142 @@
+use crate::backend::c;
+use crate::backend::conv::borrowed_fd;
+use crate::backend::fd::{AsFd, AsRawFd, BorrowedFd, LibcFd};
+use bitflags::bitflags;
+use core::marker::PhantomData;
+#[cfg(windows)]
+use {
+    crate::backend::fd::{AsSocket, RawFd},
+    core::fmt,
+};
+
+bitflags! {
+    /// `POLL*` flags for use with [`poll`].
+    ///
+    /// [`poll`]: crate::event::poll
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct PollFlags: c::c_short {
+        /// `POLLIN`
+        const IN = c::POLLIN;
+        /// `POLLPRI`
+        #[cfg(not(target_os = "wasi"))]
+        const PRI = c::POLLPRI;
+        /// `POLLOUT`
+        const OUT = c::POLLOUT;
+        /// `POLLRDNORM`
+        const RDNORM = c::POLLRDNORM;
+        /// `POLLWRNORM`
+        #[cfg(not(target_os = "l4re"))]
+        const WRNORM = c::POLLWRNORM;
+        /// `POLLRDBAND`
+        #[cfg(not(any(target_os = "l4re", target_os = "wasi")))]
+        const RDBAND = c::POLLRDBAND;
+        /// `POLLWRBAND`
+        #[cfg(not(any(target_os = "l4re", target_os = "wasi")))]
+        const WRBAND = c::POLLWRBAND;
+        /// `POLLERR`
+        const ERR = c::POLLERR;
+        /// `POLLHUP`
+        const HUP = c::POLLHUP;
+        /// `POLLNVAL`
+        #[cfg(not(target_os = "espidf"))]
+        const NVAL = c::POLLNVAL;
+        /// `POLLRDHUP`
+        #[cfg(all(
+            linux_kernel,
+            not(any(target_arch = "sparc", target_arch = "sparc64"))),
+        )]
+        const RDHUP = c::POLLRDHUP;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `struct pollfd`—File descriptor and flags for use with [`poll`].
+///
+/// [`poll`]: crate::event::poll
+#[doc(alias = "pollfd")]
+#[derive(Clone)]
+#[cfg_attr(not(windows), derive(Debug))]
+#[repr(transparent)]
+pub struct PollFd<'fd> {
+    pollfd: c::pollfd,
+    _phantom: PhantomData<BorrowedFd<'fd>>,
+}
+
+#[cfg(windows)]
+impl<'fd> fmt::Debug for PollFd<'fd> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt.debug_struct("pollfd")
+            .field("fd", &self.pollfd.fd)
+            .field("events", &self.pollfd.events)
+            .field("revents", &self.pollfd.revents)
+            .finish()
+    }
+}
+
+impl<'fd> PollFd<'fd> {
+    /// Constructs a new `PollFd` holding `fd` and `events`.
+    #[inline]
+    pub fn new<Fd: AsFd>(fd: &'fd Fd, events: PollFlags) -> Self {
+        Self::from_borrowed_fd(fd.as_fd(), events)
+    }
+
+    /// Sets the contained file descriptor to `fd`.
+    #[inline]
+    pub fn set_fd<Fd: AsFd>(&mut self, fd: &'fd Fd) {
+        self.pollfd.fd = fd.as_fd().as_raw_fd() as LibcFd;
+    }
+
+    /// Clears the ready events.
+    #[inline]
+    pub fn clear_revents(&mut self) {
+        self.pollfd.revents = 0;
+    }
+
+    /// Constructs a new `PollFd` holding `fd` and `events`.
+    ///
+    /// This is the same as `new`, but can be used to avoid borrowing the
+    /// `BorrowedFd`, which can be tricky in situations where the `BorrowedFd`
+    /// is a temporary.
+    #[inline]
+    pub fn from_borrowed_fd(fd: BorrowedFd<'fd>, events: PollFlags) -> Self {
+        Self {
+            pollfd: c::pollfd {
+                fd: borrowed_fd(fd),
+                events: events.bits(),
+                revents: 0,
+            },
+            _phantom: PhantomData,
+        }
+    }
+
+    /// Returns the ready events.
+    #[inline]
+    pub fn revents(&self) -> PollFlags {
+        // Use `.unwrap()` here because in theory we know we know all the bits
+        // the OS might set here, but OS's have added extensions in the past.
+        PollFlags::from_bits(self.pollfd.revents).unwrap()
+    }
+}
+
+#[cfg(not(windows))]
+impl<'fd> AsFd for PollFd<'fd> {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        // SAFETY: Our constructors and `set_fd` require `pollfd.fd` to be
+        // valid for the `'fd` lifetime.
+        unsafe { BorrowedFd::borrow_raw(self.pollfd.fd) }
+    }
+}
+
+#[cfg(windows)]
+impl<'fd> AsSocket for PollFd<'fd> {
+    #[inline]
+    fn as_socket(&self) -> BorrowedFd<'_> {
+        // SAFETY: Our constructors and `set_fd` require `pollfd.fd` to be
+        // valid for the `'fd` lifetime.
+        unsafe { BorrowedFd::borrow_raw(self.pollfd.fd as RawFd) }
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/event/syscalls.rs b/vendor/rustix/src/backend/libc/event/syscalls.rs
new file mode 100644
index 0000000..725ec82
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/event/syscalls.rs
@@ -0,0 +1,191 @@
+//! libc syscalls supporting `rustix::event`.
+
+use crate::backend::c;
+use crate::backend::conv::ret_c_int;
+#[cfg(any(apple, netbsdlike, target_os = "dragonfly", target_os = "solaris"))]
+use crate::backend::conv::ret_owned_fd;
+use crate::event::PollFd;
+#[cfg(any(linux_kernel, bsd, solarish, target_os = "espidf"))]
+use crate::fd::OwnedFd;
+use crate::io;
+#[cfg(any(bsd, solarish))]
+use {crate::backend::conv::borrowed_fd, crate::fd::BorrowedFd, core::mem::MaybeUninit};
+#[cfg(solarish)]
+use {
+    crate::backend::conv::ret, crate::event::port::Event, crate::utils::as_mut_ptr,
+    core::ptr::null_mut,
+};
+#[cfg(any(
+    linux_kernel,
+    target_os = "freebsd",
+    target_os = "illumos",
+    target_os = "espidf"
+))]
+use {crate::backend::conv::ret_owned_fd, crate::event::EventfdFlags};
+#[cfg(all(feature = "alloc", bsd))]
+use {crate::event::kqueue::Event, crate::utils::as_ptr, core::ptr::null};
+
+#[cfg(any(
+    linux_kernel,
+    target_os = "freebsd",
+    target_os = "illumos",
+    target_os = "espidf"
+))]
+pub(crate) fn eventfd(initval: u32, flags: EventfdFlags) -> io::Result<OwnedFd> {
+    #[cfg(linux_kernel)]
+    unsafe {
+        syscall! {
+            fn eventfd2(
+                initval: c::c_uint,
+                flags: c::c_int
+            ) via SYS_eventfd2 -> c::c_int
+        }
+        ret_owned_fd(eventfd2(initval, bitflags_bits!(flags)))
+    }
+
+    // `eventfd` was added in FreeBSD 13, so it isn't available on FreeBSD 12.
+    #[cfg(target_os = "freebsd")]
+    unsafe {
+        weakcall! {
+            fn eventfd(
+                initval: c::c_uint,
+                flags: c::c_int
+            ) -> c::c_int
+        }
+        ret_owned_fd(eventfd(initval, bitflags_bits!(flags)))
+    }
+
+    #[cfg(any(target_os = "illumos", target_os = "espidf"))]
+    unsafe {
+        ret_owned_fd(c::eventfd(initval, bitflags_bits!(flags)))
+    }
+}
+
+#[cfg(all(feature = "alloc", bsd))]
+pub(crate) fn kqueue() -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(c::kqueue()) }
+}
+
+#[cfg(all(feature = "alloc", bsd))]
+pub(crate) unsafe fn kevent(
+    kq: BorrowedFd<'_>,
+    changelist: &[Event],
+    eventlist: &mut [MaybeUninit<Event>],
+    timeout: Option<&c::timespec>,
+) -> io::Result<c::c_int> {
+    ret_c_int(c::kevent(
+        borrowed_fd(kq),
+        changelist.as_ptr().cast(),
+        changelist
+            .len()
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        eventlist.as_mut_ptr().cast(),
+        eventlist
+            .len()
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        timeout.map_or(null(), as_ptr),
+    ))
+}
+
+#[inline]
+pub(crate) fn poll(fds: &mut [PollFd<'_>], timeout: c::c_int) -> io::Result<usize> {
+    let nfds = fds
+        .len()
+        .try_into()
+        .map_err(|_convert_err| io::Errno::INVAL)?;
+
+    ret_c_int(unsafe { c::poll(fds.as_mut_ptr().cast(), nfds, timeout) })
+        .map(|nready| nready as usize)
+}
+
+#[cfg(solarish)]
+pub(crate) fn port_create() -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(c::port_create()) }
+}
+
+#[cfg(solarish)]
+pub(crate) unsafe fn port_associate(
+    port: BorrowedFd<'_>,
+    source: c::c_int,
+    object: c::uintptr_t,
+    events: c::c_int,
+    user: *mut c::c_void,
+) -> io::Result<()> {
+    ret(c::port_associate(
+        borrowed_fd(port),
+        source,
+        object,
+        events,
+        user,
+    ))
+}
+
+#[cfg(solarish)]
+pub(crate) unsafe fn port_dissociate(
+    port: BorrowedFd<'_>,
+    source: c::c_int,
+    object: c::uintptr_t,
+) -> io::Result<()> {
+    ret(c::port_dissociate(borrowed_fd(port), source, object))
+}
+
+#[cfg(solarish)]
+pub(crate) fn port_get(
+    port: BorrowedFd<'_>,
+    timeout: Option<&mut c::timespec>,
+) -> io::Result<Event> {
+    let mut event = MaybeUninit::<c::port_event>::uninit();
+    let timeout = timeout.map_or(null_mut(), as_mut_ptr);
+
+    unsafe {
+        ret(c::port_get(borrowed_fd(port), event.as_mut_ptr(), timeout))?;
+    }
+
+    // If we're done, initialize the event and return it.
+    Ok(Event(unsafe { event.assume_init() }))
+}
+
+#[cfg(all(feature = "alloc", solarish))]
+pub(crate) fn port_getn(
+    port: BorrowedFd<'_>,
+    timeout: Option<&mut c::timespec>,
+    events: &mut Vec<Event>,
+    mut nget: u32,
+) -> io::Result<()> {
+    let timeout = timeout.map_or(null_mut(), as_mut_ptr);
+    unsafe {
+        ret(c::port_getn(
+            borrowed_fd(port),
+            events.as_mut_ptr().cast(),
+            events.len().try_into().unwrap(),
+            &mut nget,
+            timeout,
+        ))?;
+    }
+
+    // Update the vector length.
+    unsafe {
+        events.set_len(nget.try_into().unwrap());
+    }
+
+    Ok(())
+}
+
+#[cfg(solarish)]
+pub(crate) fn port_send(
+    port: BorrowedFd<'_>,
+    events: c::c_int,
+    userdata: *mut c::c_void,
+) -> io::Result<()> {
+    unsafe { ret(c::port_send(borrowed_fd(port), events, userdata)) }
+}
+
+#[cfg(not(any(windows, target_os = "redox", target_os = "wasi")))]
+pub(crate) fn pause() {
+    let r = unsafe { libc::pause() };
+    let errno = libc_errno::errno().0;
+    debug_assert_eq!(r, -1);
+    debug_assert_eq!(errno, libc::EINTR);
+}
diff --git a/vendor/rustix/src/backend/libc/event/types.rs b/vendor/rustix/src/backend/libc/event/types.rs
new file mode 100644
index 0000000..a04d7e6
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/event/types.rs
@@ -0,0 +1,37 @@
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "illumos"))]
+use crate::backend::c;
+#[cfg(any(
+    linux_kernel,
+    target_os = "freebsd",
+    target_os = "illumos",
+    target_os = "espidf"
+))]
+use bitflags::bitflags;
+
+#[cfg(any(
+    linux_kernel,
+    target_os = "freebsd",
+    target_os = "illumos",
+    target_os = "espidf"
+))]
+bitflags! {
+    /// `EFD_*` flags for use with [`eventfd`].
+    ///
+    /// [`eventfd`]: crate::event::eventfd
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct EventfdFlags: u32 {
+        /// `EFD_CLOEXEC`
+        #[cfg(not(target_os = "espidf"))]
+        const CLOEXEC = bitcast!(c::EFD_CLOEXEC);
+        /// `EFD_NONBLOCK`
+        #[cfg(not(target_os = "espidf"))]
+        const NONBLOCK = bitcast!(c::EFD_NONBLOCK);
+        /// `EFD_SEMAPHORE`
+        #[cfg(not(target_os = "espidf"))]
+        const SEMAPHORE = bitcast!(c::EFD_SEMAPHORE);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/event/windows_syscalls.rs b/vendor/rustix/src/backend/libc/event/windows_syscalls.rs
new file mode 100644
index 0000000..8ccad47
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/event/windows_syscalls.rs
@@ -0,0 +1,16 @@
+//! Windows system calls in the `event` module.
+
+use crate::backend::c;
+use crate::backend::conv::ret_c_int;
+use crate::event::PollFd;
+use crate::io;
+
+pub(crate) fn poll(fds: &mut [PollFd<'_>], timeout: c::c_int) -> io::Result<usize> {
+    let nfds = fds
+        .len()
+        .try_into()
+        .map_err(|_convert_err| io::Errno::INVAL)?;
+
+    ret_c_int(unsafe { c::poll(fds.as_mut_ptr().cast(), nfds, timeout) })
+        .map(|nready| nready as usize)
+}
diff --git a/vendor/rustix/src/backend/libc/fs/dir.rs b/vendor/rustix/src/backend/libc/fs/dir.rs
new file mode 100644
index 0000000..82a0a90
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/fs/dir.rs
@@ -0,0 +1,423 @@
+#[cfg(not(any(solarish, target_os = "haiku", target_os = "nto", target_os = "vita")))]
+use super::types::FileType;
+use crate::backend::c;
+use crate::backend::conv::owned_fd;
+use crate::fd::{AsFd, BorrowedFd, OwnedFd};
+use crate::ffi::{CStr, CString};
+use crate::fs::{fcntl_getfl, openat, Mode, OFlags};
+#[cfg(not(target_os = "vita"))]
+use crate::fs::{fstat, Stat};
+#[cfg(not(any(
+    solarish,
+    target_os = "haiku",
+    target_os = "netbsd",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+use crate::fs::{fstatfs, StatFs};
+#[cfg(not(any(
+    solarish,
+    target_os = "haiku",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+use crate::fs::{fstatvfs, StatVfs};
+use crate::io;
+#[cfg(not(any(target_os = "fuchsia", target_os = "vita", target_os = "wasi")))]
+#[cfg(feature = "process")]
+use crate::process::fchdir;
+use alloc::borrow::ToOwned;
+#[cfg(not(any(linux_like, target_os = "hurd")))]
+use c::readdir as libc_readdir;
+#[cfg(any(linux_like, target_os = "hurd"))]
+use c::readdir64 as libc_readdir;
+use core::fmt;
+use core::ptr::NonNull;
+use libc_errno::{errno, set_errno, Errno};
+
+/// `DIR*`
+pub struct Dir {
+    /// The `libc` `DIR` pointer.
+    libc_dir: NonNull<c::DIR>,
+
+    /// Have we seen any errors in this iteration?
+    any_errors: bool,
+}
+
+impl Dir {
+    /// Take ownership of `fd` and construct a `Dir` that reads entries from
+    /// the given directory file descriptor.
+    #[inline]
+    pub fn new<Fd: Into<OwnedFd>>(fd: Fd) -> io::Result<Self> {
+        Self::_new(fd.into())
+    }
+
+    #[inline]
+    fn _new(fd: OwnedFd) -> io::Result<Self> {
+        let raw = owned_fd(fd);
+        unsafe {
+            let libc_dir = c::fdopendir(raw);
+
+            if let Some(libc_dir) = NonNull::new(libc_dir) {
+                Ok(Self {
+                    libc_dir,
+                    any_errors: false,
+                })
+            } else {
+                let err = io::Errno::last_os_error();
+                let _ = c::close(raw);
+                Err(err)
+            }
+        }
+    }
+
+    /// Borrow `fd` and construct a `Dir` that reads entries from the given
+    /// directory file descriptor.
+    #[inline]
+    pub fn read_from<Fd: AsFd>(fd: Fd) -> io::Result<Self> {
+        Self::_read_from(fd.as_fd())
+    }
+
+    #[inline]
+    #[allow(unused_mut)]
+    fn _read_from(fd: BorrowedFd<'_>) -> io::Result<Self> {
+        let mut any_errors = false;
+
+        // Given an arbitrary `OwnedFd`, it's impossible to know whether the
+        // user holds a `dup`'d copy which could continue to modify the
+        // file description state, which would cause Undefined Behavior after
+        // our call to `fdopendir`. To prevent this, we obtain an independent
+        // `OwnedFd`.
+        let flags = fcntl_getfl(fd)?;
+        let fd_for_dir = match openat(fd, cstr!("."), flags | OFlags::CLOEXEC, Mode::empty()) {
+            Ok(fd) => fd,
+            #[cfg(not(target_os = "wasi"))]
+            Err(io::Errno::NOENT) => {
+                // If "." doesn't exist, it means the directory was removed.
+                // We treat that as iterating through a directory with no
+                // entries.
+                any_errors = true;
+                crate::io::dup(fd)?
+            }
+            Err(err) => return Err(err),
+        };
+
+        let raw = owned_fd(fd_for_dir);
+        unsafe {
+            let libc_dir = c::fdopendir(raw);
+
+            if let Some(libc_dir) = NonNull::new(libc_dir) {
+                Ok(Self {
+                    libc_dir,
+                    any_errors,
+                })
+            } else {
+                let err = io::Errno::last_os_error();
+                let _ = c::close(raw);
+                Err(err)
+            }
+        }
+    }
+
+    /// `rewinddir(self)`
+    #[inline]
+    pub fn rewind(&mut self) {
+        self.any_errors = false;
+        unsafe { c::rewinddir(self.libc_dir.as_ptr()) }
+    }
+
+    /// `readdir(self)`, where `None` means the end of the directory.
+    pub fn read(&mut self) -> Option<io::Result<DirEntry>> {
+        // If we've seen errors, don't continue to try to read anyting further.
+        if self.any_errors {
+            return None;
+        }
+
+        set_errno(Errno(0));
+        let dirent_ptr = unsafe { libc_readdir(self.libc_dir.as_ptr()) };
+        if dirent_ptr.is_null() {
+            let curr_errno = errno().0;
+            if curr_errno == 0 {
+                // We successfully reached the end of the stream.
+                None
+            } else {
+                // `errno` is unknown or non-zero, so an error occurred.
+                self.any_errors = true;
+                Some(Err(io::Errno(curr_errno)))
+            }
+        } else {
+            // We successfully read an entry.
+            unsafe {
+                let dirent = &*dirent_ptr;
+
+                // We have our own copy of OpenBSD's dirent; check that the
+                // layout minimally matches libc's.
+                #[cfg(target_os = "openbsd")]
+                check_dirent_layout(dirent);
+
+                let result = DirEntry {
+                    #[cfg(not(any(
+                        solarish,
+                        target_os = "aix",
+                        target_os = "haiku",
+                        target_os = "nto",
+                        target_os = "vita"
+                    )))]
+                    d_type: dirent.d_type,
+
+                    #[cfg(not(any(freebsdlike, netbsdlike, target_os = "vita")))]
+                    d_ino: dirent.d_ino,
+
+                    #[cfg(any(freebsdlike, netbsdlike))]
+                    d_fileno: dirent.d_fileno,
+
+                    name: CStr::from_ptr(dirent.d_name.as_ptr()).to_owned(),
+                };
+
+                Some(Ok(result))
+            }
+        }
+    }
+
+    /// `fstat(self)`
+    #[cfg(not(target_os = "vita"))]
+    #[inline]
+    pub fn stat(&self) -> io::Result<Stat> {
+        fstat(unsafe { BorrowedFd::borrow_raw(c::dirfd(self.libc_dir.as_ptr())) })
+    }
+
+    /// `fstatfs(self)`
+    #[cfg(not(any(
+        solarish,
+        target_os = "haiku",
+        target_os = "netbsd",
+        target_os = "nto",
+        target_os = "redox",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    #[inline]
+    pub fn statfs(&self) -> io::Result<StatFs> {
+        fstatfs(unsafe { BorrowedFd::borrow_raw(c::dirfd(self.libc_dir.as_ptr())) })
+    }
+
+    /// `fstatvfs(self)`
+    #[cfg(not(any(
+        solarish,
+        target_os = "haiku",
+        target_os = "redox",
+        target_os = "vita",
+        target_os = "wasi"
+    )))]
+    #[inline]
+    pub fn statvfs(&self) -> io::Result<StatVfs> {
+        fstatvfs(unsafe { BorrowedFd::borrow_raw(c::dirfd(self.libc_dir.as_ptr())) })
+    }
+
+    /// `fchdir(self)`
+    #[cfg(feature = "process")]
+    #[cfg(not(any(target_os = "fuchsia", target_os = "vita", target_os = "wasi")))]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "process")))]
+    #[inline]
+    pub fn chdir(&self) -> io::Result<()> {
+        fchdir(unsafe { BorrowedFd::borrow_raw(c::dirfd(self.libc_dir.as_ptr())) })
+    }
+}
+
+/// `Dir` implements `Send` but not `Sync`, because we use `readdir` which is
+/// not guaranteed to be thread-safe. Users can wrap this in a `Mutex` if they
+/// need `Sync`, which is effectively what'd need to do to implement `Sync`
+/// ourselves.
+unsafe impl Send for Dir {}
+
+impl Drop for Dir {
+    #[inline]
+    fn drop(&mut self) {
+        unsafe { c::closedir(self.libc_dir.as_ptr()) };
+    }
+}
+
+impl Iterator for Dir {
+    type Item = io::Result<DirEntry>;
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        Self::read(self)
+    }
+}
+
+impl fmt::Debug for Dir {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let mut s = f.debug_struct("Dir");
+        #[cfg(not(target_os = "vita"))]
+        s.field("fd", unsafe { &c::dirfd(self.libc_dir.as_ptr()) });
+        s.finish()
+    }
+}
+
+/// `struct dirent`
+#[derive(Debug)]
+pub struct DirEntry {
+    #[cfg(not(any(
+        solarish,
+        target_os = "aix",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita"
+    )))]
+    d_type: u8,
+
+    #[cfg(not(any(freebsdlike, netbsdlike, target_os = "vita")))]
+    d_ino: c::ino_t,
+
+    #[cfg(any(freebsdlike, netbsdlike))]
+    d_fileno: c::ino_t,
+
+    name: CString,
+}
+
+impl DirEntry {
+    /// Returns the file name of this directory entry.
+    #[inline]
+    pub fn file_name(&self) -> &CStr {
+        &self.name
+    }
+
+    /// Returns the type of this directory entry.
+    #[cfg(not(any(
+        solarish,
+        target_os = "aix",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita"
+    )))]
+    #[inline]
+    pub fn file_type(&self) -> FileType {
+        FileType::from_dirent_d_type(self.d_type)
+    }
+
+    /// Return the inode number of this directory entry.
+    #[cfg(not(any(freebsdlike, netbsdlike, target_os = "vita")))]
+    #[inline]
+    pub fn ino(&self) -> u64 {
+        self.d_ino as u64
+    }
+
+    /// Return the inode number of this directory entry.
+    #[cfg(any(freebsdlike, netbsdlike))]
+    #[inline]
+    pub fn ino(&self) -> u64 {
+        #[allow(clippy::useless_conversion)]
+        self.d_fileno.into()
+    }
+}
+
+/// libc's OpenBSD `dirent` has a private field so we can't construct it
+/// directly, so we declare it ourselves to make all fields accessible.
+#[cfg(target_os = "openbsd")]
+#[repr(C)]
+#[derive(Debug)]
+struct libc_dirent {
+    d_fileno: c::ino_t,
+    d_off: c::off_t,
+    d_reclen: u16,
+    d_type: u8,
+    d_namlen: u8,
+    __d_padding: [u8; 4],
+    d_name: [c::c_char; 256],
+}
+
+/// We have our own copy of OpenBSD's dirent; check that the layout
+/// minimally matches libc's.
+#[cfg(target_os = "openbsd")]
+fn check_dirent_layout(dirent: &c::dirent) {
+    use crate::utils::as_ptr;
+
+    // Check that the basic layouts match.
+    #[cfg(test)]
+    {
+        assert_eq_size!(libc_dirent, c::dirent);
+        assert_eq_size!(libc_dirent, c::dirent);
+    }
+
+    // Check that the field offsets match.
+    assert_eq!(
+        {
+            let z = libc_dirent {
+                d_fileno: 0_u64,
+                d_off: 0_i64,
+                d_reclen: 0_u16,
+                d_type: 0_u8,
+                d_namlen: 0_u8,
+                __d_padding: [0_u8; 4],
+                d_name: [0 as c::c_char; 256],
+            };
+            let base = as_ptr(&z) as usize;
+            (
+                (as_ptr(&z.d_fileno) as usize) - base,
+                (as_ptr(&z.d_off) as usize) - base,
+                (as_ptr(&z.d_reclen) as usize) - base,
+                (as_ptr(&z.d_type) as usize) - base,
+                (as_ptr(&z.d_namlen) as usize) - base,
+                (as_ptr(&z.d_name) as usize) - base,
+            )
+        },
+        {
+            let z = dirent;
+            let base = as_ptr(z) as usize;
+            (
+                (as_ptr(&z.d_fileno) as usize) - base,
+                (as_ptr(&z.d_off) as usize) - base,
+                (as_ptr(&z.d_reclen) as usize) - base,
+                (as_ptr(&z.d_type) as usize) - base,
+                (as_ptr(&z.d_namlen) as usize) - base,
+                (as_ptr(&z.d_name) as usize) - base,
+            )
+        }
+    );
+}
+
+#[test]
+fn dir_iterator_handles_io_errors() {
+    // create a dir, keep the FD, then delete the dir
+    let tmp = tempfile::tempdir().unwrap();
+    let fd = crate::fs::openat(
+        crate::fs::CWD,
+        tmp.path(),
+        crate::fs::OFlags::RDONLY | crate::fs::OFlags::CLOEXEC,
+        crate::fs::Mode::empty(),
+    )
+    .unwrap();
+
+    let file_fd = crate::fs::openat(
+        &fd,
+        tmp.path().join("test.txt"),
+        crate::fs::OFlags::WRONLY | crate::fs::OFlags::CREATE,
+        crate::fs::Mode::RWXU,
+    )
+    .unwrap();
+
+    let mut dir = Dir::read_from(&fd).unwrap();
+
+    // Reach inside the `Dir` and replace its directory with a file, which
+    // will cause the subsequent `readdir` to fail.
+    unsafe {
+        let raw_fd = c::dirfd(dir.libc_dir.as_ptr());
+        let mut owned_fd: crate::fd::OwnedFd = crate::fd::FromRawFd::from_raw_fd(raw_fd);
+        crate::io::dup2(&file_fd, &mut owned_fd).unwrap();
+        core::mem::forget(owned_fd);
+    }
+
+    // FreeBSD and macOS seem to read some directory entries before we call
+    // `.next()`.
+    #[cfg(any(apple, freebsdlike))]
+    {
+        dir.rewind();
+    }
+
+    assert!(matches!(dir.next(), Some(Err(_))));
+    assert!(dir.next().is_none());
+}
diff --git a/vendor/rustix/src/backend/libc/fs/inotify.rs b/vendor/rustix/src/backend/libc/fs/inotify.rs
new file mode 100644
index 0000000..2044bd9
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/fs/inotify.rs
@@ -0,0 +1,131 @@
+//! inotify support for working with inotifies
+
+use crate::backend::c;
+use crate::backend::conv::{borrowed_fd, c_str, ret, ret_c_int, ret_owned_fd};
+use crate::fd::{BorrowedFd, OwnedFd};
+use crate::io;
+use bitflags::bitflags;
+
+bitflags! {
+    /// `IN_*` for use with [`inotify_init`].
+    ///
+    /// [`inotify_init`]: crate::fs::inotify::inotify_init
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct CreateFlags: u32 {
+        /// `IN_CLOEXEC`
+        const CLOEXEC = bitcast!(c::IN_CLOEXEC);
+        /// `IN_NONBLOCK`
+        const NONBLOCK = bitcast!(c::IN_NONBLOCK);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `IN*` for use with [`inotify_add_watch`].
+    ///
+    /// [`inotify_add_watch`]: crate::fs::inotify::inotify_add_watch
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct WatchFlags: u32 {
+        /// `IN_ACCESS`
+        const ACCESS = c::IN_ACCESS;
+        /// `IN_ATTRIB`
+        const ATTRIB = c::IN_ATTRIB;
+        /// `IN_CLOSE_NOWRITE`
+        const CLOSE_NOWRITE = c::IN_CLOSE_NOWRITE;
+        /// `IN_CLOSE_WRITE`
+        const CLOSE_WRITE = c::IN_CLOSE_WRITE;
+        /// `IN_CREATE`
+        const CREATE = c::IN_CREATE;
+        /// `IN_DELETE`
+        const DELETE = c::IN_DELETE;
+        /// `IN_DELETE_SELF`
+        const DELETE_SELF = c::IN_DELETE_SELF;
+        /// `IN_MODIFY`
+        const MODIFY = c::IN_MODIFY;
+        /// `IN_MOVE_SELF`
+        const MOVE_SELF = c::IN_MOVE_SELF;
+        /// `IN_MOVED_FROM`
+        const MOVED_FROM = c::IN_MOVED_FROM;
+        /// `IN_MOVED_TO`
+        const MOVED_TO = c::IN_MOVED_TO;
+        /// `IN_OPEN`
+        const OPEN = c::IN_OPEN;
+
+        /// `IN_CLOSE`
+        const CLOSE = c::IN_CLOSE;
+        /// `IN_MOVE`
+        const MOVE = c::IN_MOVE;
+        /// `IN_ALL_EVENTS`
+        const ALL_EVENTS = c::IN_ALL_EVENTS;
+
+        /// `IN_DONT_FOLLOW`
+        const DONT_FOLLOW = c::IN_DONT_FOLLOW;
+        /// `IN_EXCL_UNLINK`
+        const EXCL_UNLINK = 1;
+        /// `IN_MASK_ADD`
+        const MASK_ADD = 1;
+        /// `IN_MASK_CREATE`
+        const MASK_CREATE = 1;
+        /// `IN_ONESHOT`
+        const ONESHOT = c::IN_ONESHOT;
+        /// `IN_ONLYDIR`
+        const ONLYDIR = c::IN_ONLYDIR;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `inotify_init1(flags)`—Creates a new inotify object.
+///
+/// Use the [`CreateFlags::CLOEXEC`] flag to prevent the resulting file
+/// descriptor from being implicitly passed across `exec` boundaries.
+#[doc(alias = "inotify_init1")]
+pub fn inotify_init(flags: CreateFlags) -> io::Result<OwnedFd> {
+    // SAFETY: `inotify_init1` has no safety preconditions.
+    unsafe { ret_owned_fd(c::inotify_init1(bitflags_bits!(flags))) }
+}
+
+/// `inotify_add_watch(self, path, flags)`—Adds a watch to inotify.
+///
+/// This registers or updates a watch for the filesystem path `path` and
+/// returns a watch descriptor corresponding to this watch.
+///
+/// Note: Due to the existence of hardlinks, providing two different paths to
+/// this method may result in it returning the same watch descriptor. An
+/// application should keep track of this externally to avoid logic errors.
+pub fn inotify_add_watch<P: crate::path::Arg>(
+    inot: BorrowedFd<'_>,
+    path: P,
+    flags: WatchFlags,
+) -> io::Result<i32> {
+    path.into_with_c_str(|path| {
+        // SAFETY: The fd and path we are passing is guaranteed valid by the
+        // type system.
+        unsafe {
+            ret_c_int(c::inotify_add_watch(
+                borrowed_fd(inot),
+                c_str(path),
+                flags.bits(),
+            ))
+        }
+    })
+}
+
+/// `inotify_rm_watch(self, wd)`—Removes a watch from this inotify.
+///
+/// The watch descriptor provided should have previously been returned by
+/// [`inotify_add_watch`] and not previously have been removed.
+#[doc(alias = "inotify_rm_watch")]
+pub fn inotify_remove_watch(inot: BorrowedFd<'_>, wd: i32) -> io::Result<()> {
+    // Android's `inotify_rm_watch` takes `u32` despite that
+    // `inotify_add_watch` expects a `i32`.
+    #[cfg(target_os = "android")]
+    let wd = wd as u32;
+    // SAFETY: The fd is valid and closing an arbitrary wd is valid.
+    unsafe { ret(c::inotify_rm_watch(borrowed_fd(inot), wd)) }
+}
diff --git a/vendor/rustix/src/backend/libc/fs/makedev.rs b/vendor/rustix/src/backend/libc/fs/makedev.rs
new file mode 100644
index 0000000..aa12102
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/fs/makedev.rs
@@ -0,0 +1,138 @@
+#[cfg(not(all(target_os = "android", target_pointer_width = "32")))]
+use crate::backend::c;
+use crate::fs::Dev;
+
+#[cfg(not(any(
+    apple,
+    solarish,
+    target_os = "aix",
+    target_os = "android",
+    target_os = "emscripten",
+)))]
+#[inline]
+pub(crate) fn makedev(maj: u32, min: u32) -> Dev {
+    c::makedev(maj, min)
+}
+
+#[cfg(solarish)]
+pub(crate) fn makedev(maj: u32, min: u32) -> Dev {
+    // SAFETY: Solarish's `makedev` is marked unsafe but it isn't doing
+    // anything unsafe.
+    unsafe { c::makedev(maj, min) }
+}
+
+#[cfg(all(target_os = "android", not(target_pointer_width = "32")))]
+#[inline]
+pub(crate) fn makedev(maj: u32, min: u32) -> Dev {
+    c::makedev(maj, min)
+}
+
+#[cfg(all(target_os = "android", target_pointer_width = "32"))]
+#[inline]
+pub(crate) fn makedev(maj: u32, min: u32) -> Dev {
+    // 32-bit Android's `dev_t` is 32-bit, but its `st_dev` is 64-bit, so we do
+    // it ourselves.
+    ((u64::from(maj) & 0xffff_f000_u64) << 32)
+        | ((u64::from(maj) & 0x0000_0fff_u64) << 8)
+        | ((u64::from(min) & 0xffff_ff00_u64) << 12)
+        | (u64::from(min) & 0x0000_00ff_u64)
+}
+
+#[cfg(target_os = "emscripten")]
+#[inline]
+pub(crate) fn makedev(maj: u32, min: u32) -> Dev {
+    // Emscripten's `makedev` has a 32-bit return value.
+    Dev::from(c::makedev(maj, min))
+}
+
+#[cfg(apple)]
+#[inline]
+pub(crate) fn makedev(maj: u32, min: u32) -> Dev {
+    // Apple's `makedev` oddly has signed argument types and is `unsafe`.
+    unsafe { c::makedev(maj as i32, min as i32) }
+}
+
+#[cfg(target_os = "aix")]
+#[inline]
+pub(crate) fn makedev(maj: u32, min: u32) -> Dev {
+    // AIX's `makedev` oddly is `unsafe`.
+    unsafe { c::makedev(maj, min) }
+}
+
+#[cfg(not(any(
+    apple,
+    freebsdlike,
+    target_os = "android",
+    target_os = "emscripten",
+    target_os = "netbsd"
+)))]
+#[inline]
+pub(crate) fn major(dev: Dev) -> u32 {
+    unsafe { c::major(dev) }
+}
+
+#[cfg(any(
+    apple,
+    freebsdlike,
+    target_os = "netbsd",
+    all(target_os = "android", not(target_pointer_width = "32")),
+))]
+#[inline]
+pub(crate) fn major(dev: Dev) -> u32 {
+    // On some platforms `major` oddly has signed return types.
+    (unsafe { c::major(dev) }) as u32
+}
+
+#[cfg(all(target_os = "android", target_pointer_width = "32"))]
+#[inline]
+pub(crate) fn major(dev: Dev) -> u32 {
+    // 32-bit Android's `dev_t` is 32-bit, but its `st_dev` is 64-bit, so we do
+    // it ourselves.
+    (((dev >> 31 >> 1) & 0xffff_f000) | ((dev >> 8) & 0x0000_0fff)) as u32
+}
+
+#[cfg(target_os = "emscripten")]
+#[inline]
+pub(crate) fn major(dev: Dev) -> u32 {
+    // Emscripten's `major` has a 32-bit argument value.
+    unsafe { c::major(dev as u32) }
+}
+
+#[cfg(not(any(
+    apple,
+    freebsdlike,
+    target_os = "android",
+    target_os = "emscripten",
+    target_os = "netbsd"
+)))]
+#[inline]
+pub(crate) fn minor(dev: Dev) -> u32 {
+    unsafe { c::minor(dev) }
+}
+
+#[cfg(any(
+    apple,
+    freebsdlike,
+    target_os = "netbsd",
+    all(target_os = "android", not(target_pointer_width = "32"))
+))]
+#[inline]
+pub(crate) fn minor(dev: Dev) -> u32 {
+    // On some platforms, `minor` oddly has signed return types.
+    (unsafe { c::minor(dev) }) as u32
+}
+
+#[cfg(all(target_os = "android", target_pointer_width = "32"))]
+#[inline]
+pub(crate) fn minor(dev: Dev) -> u32 {
+    // 32-bit Android's `dev_t` is 32-bit, but its `st_dev` is 64-bit, so we do
+    // it ourselves.
+    (((dev >> 12) & 0xffff_ff00) | (dev & 0x0000_00ff)) as u32
+}
+
+#[cfg(target_os = "emscripten")]
+#[inline]
+pub(crate) fn minor(dev: Dev) -> u32 {
+    // Emscripten's `minor` has a 32-bit argument value.
+    unsafe { c::minor(dev as u32) }
+}
diff --git a/vendor/rustix/src/backend/libc/fs/mod.rs b/vendor/rustix/src/backend/libc/fs/mod.rs
new file mode 100644
index 0000000..c17e863
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/fs/mod.rs
@@ -0,0 +1,23 @@
+#[cfg(all(feature = "alloc", not(any(target_os = "espidf", target_os = "redox"))))]
+pub(crate) mod dir;
+#[cfg(linux_kernel)]
+pub mod inotify;
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+pub(crate) mod makedev;
+#[cfg(not(windows))]
+pub(crate) mod syscalls;
+pub(crate) mod types;
+
+// TODO: Fix linux-raw-sys to define ioctl codes for sparc.
+#[cfg(all(linux_kernel, any(target_arch = "sparc", target_arch = "sparc64")))]
+pub(crate) const EXT4_IOC_RESIZE_FS: crate::ioctl::RawOpcode = 0x8008_6610;
+
+#[cfg(all(linux_kernel, not(any(target_arch = "sparc", target_arch = "sparc64"))))]
+pub(crate) const EXT4_IOC_RESIZE_FS: crate::ioctl::RawOpcode =
+    linux_raw_sys::ioctl::EXT4_IOC_RESIZE_FS as crate::ioctl::RawOpcode;
diff --git a/vendor/rustix/src/backend/libc/fs/syscalls.rs b/vendor/rustix/src/backend/libc/fs/syscalls.rs
new file mode 100644
index 0000000..70e86cf
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/fs/syscalls.rs
@@ -0,0 +1,2514 @@
+//! libc syscalls supporting `rustix::fs`.
+
+use crate::backend::c;
+#[cfg(any(
+    not(target_os = "redox"),
+    feature = "alloc",
+    all(linux_kernel, feature = "procfs")
+))]
+use crate::backend::conv::ret_usize;
+use crate::backend::conv::{borrowed_fd, c_str, ret, ret_c_int, ret_off_t, ret_owned_fd};
+use crate::fd::{BorrowedFd, OwnedFd};
+use crate::ffi::CStr;
+#[cfg(all(apple, feature = "alloc"))]
+use crate::ffi::CString;
+#[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+use crate::fs::Access;
+#[cfg(not(any(
+    apple,
+    netbsdlike,
+    solarish,
+    target_os = "dragonfly",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "redox",
+    target_os = "vita",
+)))]
+use crate::fs::Advice;
+#[cfg(not(any(target_os = "espidf", target_os = "redox")))]
+use crate::fs::AtFlags;
+#[cfg(not(any(
+    netbsdlike,
+    solarish,
+    target_os = "aix",
+    target_os = "dragonfly",
+    target_os = "espidf",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+)))]
+use crate::fs::FallocateFlags;
+#[cfg(not(any(target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+use crate::fs::FlockOperation;
+#[cfg(any(linux_kernel, target_os = "freebsd"))]
+use crate::fs::MemfdFlags;
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
+use crate::fs::SealFlags;
+#[cfg(not(any(
+    solarish,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "netbsd",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+use crate::fs::StatFs;
+#[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+use crate::fs::Timestamps;
+#[cfg(not(any(
+    apple,
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+use crate::fs::{Dev, FileType};
+use crate::fs::{Mode, OFlags, SeekFrom, Stat};
+#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+use crate::fs::{StatVfs, StatVfsMountFlags};
+use crate::io;
+#[cfg(all(target_env = "gnu", fix_y2038))]
+use crate::timespec::LibcTimespec;
+#[cfg(not(target_os = "wasi"))]
+use crate::ugid::{Gid, Uid};
+#[cfg(all(apple, feature = "alloc"))]
+use alloc::vec;
+use core::mem::MaybeUninit;
+#[cfg(apple)]
+use {
+    crate::backend::conv::nonnegative_ret,
+    crate::fs::{copyfile_state_t, CloneFlags, CopyfileFlags},
+};
+#[cfg(any(apple, linux_kernel))]
+use {crate::fs::XattrFlags, core::mem::size_of, core::ptr::null_mut};
+#[cfg(linux_kernel)]
+use {
+    crate::fs::{RenameFlags, ResolveFlags, Statx, StatxFlags, CWD},
+    core::ptr::null,
+};
+
+#[cfg(all(target_env = "gnu", fix_y2038))]
+weak!(fn __utimensat64(c::c_int, *const c::c_char, *const LibcTimespec, c::c_int) -> c::c_int);
+#[cfg(all(target_env = "gnu", fix_y2038))]
+weak!(fn __futimens64(c::c_int, *const LibcTimespec) -> c::c_int);
+
+/// Use a direct syscall (via libc) for `open`.
+///
+/// This is only currently necessary as a workaround for old glibc; see below.
+#[cfg(all(unix, target_env = "gnu"))]
+fn open_via_syscall(path: &CStr, oflags: OFlags, mode: Mode) -> io::Result<OwnedFd> {
+    // Linux on aarch64, loongarch64 and riscv64 has no `open` syscall so use
+    // `openat`.
+    #[cfg(any(
+        target_arch = "aarch64",
+        target_arch = "riscv32",
+        target_arch = "riscv64",
+        target_arch = "csky",
+        target_arch = "loongarch64"
+    ))]
+    {
+        openat_via_syscall(CWD, path, oflags, mode)
+    }
+
+    // Use the `open` syscall.
+    #[cfg(not(any(
+        target_arch = "aarch64",
+        target_arch = "riscv32",
+        target_arch = "riscv64",
+        target_arch = "csky",
+        target_arch = "loongarch64"
+    )))]
+    unsafe {
+        syscall! {
+            fn open(
+                pathname: *const c::c_char,
+                oflags: c::c_int,
+                mode: c::mode_t
+            ) via SYS_open -> c::c_int
+        }
+
+        ret_owned_fd(open(
+            c_str(path),
+            bitflags_bits!(oflags),
+            bitflags_bits!(mode),
+        ))
+    }
+}
+
+pub(crate) fn open(path: &CStr, oflags: OFlags, mode: Mode) -> io::Result<OwnedFd> {
+    // Work around <https://sourceware.org/bugzilla/show_bug.cgi?id=17523>.
+    // glibc versions before 2.25 don't handle `O_TMPFILE` correctly.
+    #[cfg(all(unix, target_env = "gnu", not(target_os = "hurd")))]
+    if oflags.contains(OFlags::TMPFILE) && crate::backend::if_glibc_is_less_than_2_25() {
+        return open_via_syscall(path, oflags, mode);
+    }
+
+    // On these platforms, `mode_t` is `u16` and can't be passed directly to a
+    // variadic function.
+    #[cfg(any(
+        apple,
+        freebsdlike,
+        all(target_os = "android", target_pointer_width = "32")
+    ))]
+    let mode: c::c_uint = mode.bits().into();
+
+    // Otherwise, cast to `mode_t` as that's what `open` is documented to take.
+    #[cfg(not(any(
+        apple,
+        freebsdlike,
+        all(target_os = "android", target_pointer_width = "32")
+    )))]
+    let mode: c::mode_t = mode.bits() as _;
+
+    unsafe { ret_owned_fd(c::open(c_str(path), bitflags_bits!(oflags), mode)) }
+}
+
+/// Use a direct syscall (via libc) for `openat`.
+///
+/// This is only currently necessary as a workaround for old glibc; see below.
+#[cfg(all(unix, target_env = "gnu", not(target_os = "hurd")))]
+fn openat_via_syscall(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    oflags: OFlags,
+    mode: Mode,
+) -> io::Result<OwnedFd> {
+    syscall! {
+        fn openat(
+            base_dirfd: c::c_int,
+            pathname: *const c::c_char,
+            oflags: c::c_int,
+            mode: c::mode_t
+        ) via SYS_openat -> c::c_int
+    }
+
+    unsafe {
+        ret_owned_fd(openat(
+            borrowed_fd(dirfd),
+            c_str(path),
+            bitflags_bits!(oflags),
+            bitflags_bits!(mode),
+        ))
+    }
+}
+
+#[cfg(not(target_os = "redox"))]
+pub(crate) fn openat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    oflags: OFlags,
+    mode: Mode,
+) -> io::Result<OwnedFd> {
+    // Work around <https://sourceware.org/bugzilla/show_bug.cgi?id=17523>.
+    // glibc versions before 2.25 don't handle `O_TMPFILE` correctly.
+    #[cfg(all(unix, target_env = "gnu", not(target_os = "hurd")))]
+    if oflags.contains(OFlags::TMPFILE) && crate::backend::if_glibc_is_less_than_2_25() {
+        return openat_via_syscall(dirfd, path, oflags, mode);
+    }
+
+    // On these platforms, `mode_t` is `u16` and can't be passed directly to a
+    // variadic function.
+    #[cfg(any(
+        apple,
+        freebsdlike,
+        all(target_os = "android", target_pointer_width = "32")
+    ))]
+    let mode: c::c_uint = mode.bits().into();
+
+    // Otherwise, cast to `mode_t` as that's what `open` is documented to take.
+    #[cfg(not(any(
+        apple,
+        freebsdlike,
+        all(target_os = "android", target_pointer_width = "32")
+    )))]
+    let mode: c::mode_t = mode.bits() as _;
+
+    unsafe {
+        ret_owned_fd(c::openat(
+            borrowed_fd(dirfd),
+            c_str(path),
+            bitflags_bits!(oflags),
+            mode,
+        ))
+    }
+}
+
+#[cfg(not(any(
+    solarish,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "netbsd",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+#[inline]
+pub(crate) fn statfs(filename: &CStr) -> io::Result<StatFs> {
+    unsafe {
+        let mut result = MaybeUninit::<StatFs>::uninit();
+        ret(c::statfs(c_str(filename), result.as_mut_ptr()))?;
+        Ok(result.assume_init())
+    }
+}
+
+#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+#[inline]
+pub(crate) fn statvfs(filename: &CStr) -> io::Result<StatVfs> {
+    unsafe {
+        let mut result = MaybeUninit::<c::statvfs>::uninit();
+        ret(c::statvfs(c_str(filename), result.as_mut_ptr()))?;
+        Ok(libc_statvfs_to_statvfs(result.assume_init()))
+    }
+}
+
+#[cfg(feature = "alloc")]
+#[inline]
+pub(crate) fn readlink(path: &CStr, buf: &mut [u8]) -> io::Result<usize> {
+    unsafe {
+        ret_usize(
+            c::readlink(c_str(path), buf.as_mut_ptr().cast::<c::c_char>(), buf.len()) as isize,
+        )
+    }
+}
+
+#[cfg(not(target_os = "redox"))]
+#[inline]
+pub(crate) fn readlinkat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    buf: &mut [MaybeUninit<u8>],
+) -> io::Result<usize> {
+    unsafe {
+        ret_usize(c::readlinkat(
+            borrowed_fd(dirfd),
+            c_str(path),
+            buf.as_mut_ptr().cast::<c::c_char>(),
+            buf.len(),
+        ) as isize)
+    }
+}
+
+pub(crate) fn mkdir(path: &CStr, mode: Mode) -> io::Result<()> {
+    unsafe { ret(c::mkdir(c_str(path), mode.bits() as c::mode_t)) }
+}
+
+#[cfg(not(target_os = "redox"))]
+pub(crate) fn mkdirat(dirfd: BorrowedFd<'_>, path: &CStr, mode: Mode) -> io::Result<()> {
+    unsafe {
+        ret(c::mkdirat(
+            borrowed_fd(dirfd),
+            c_str(path),
+            mode.bits() as c::mode_t,
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+pub(crate) fn getdents_uninit(
+    fd: BorrowedFd<'_>,
+    buf: &mut [MaybeUninit<u8>],
+) -> io::Result<usize> {
+    syscall! {
+        fn getdents64(
+            fd: c::c_int,
+            dirp: *mut c::c_void,
+            count: usize
+        ) via SYS_getdents64 -> c::ssize_t
+    }
+    unsafe {
+        ret_usize(getdents64(
+            borrowed_fd(fd),
+            buf.as_mut_ptr().cast::<c::c_void>(),
+            buf.len(),
+        ))
+    }
+}
+
+pub(crate) fn link(old_path: &CStr, new_path: &CStr) -> io::Result<()> {
+    unsafe { ret(c::link(c_str(old_path), c_str(new_path))) }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "redox")))]
+pub(crate) fn linkat(
+    old_dirfd: BorrowedFd<'_>,
+    old_path: &CStr,
+    new_dirfd: BorrowedFd<'_>,
+    new_path: &CStr,
+    flags: AtFlags,
+) -> io::Result<()> {
+    // macOS <= 10.9 lacks `linkat`.
+    #[cfg(target_os = "macos")]
+    unsafe {
+        weak! {
+            fn linkat(
+                c::c_int,
+                *const c::c_char,
+                c::c_int,
+                *const c::c_char,
+                c::c_int
+            ) -> c::c_int
+        }
+        // If we have `linkat`, use it.
+        if let Some(libc_linkat) = linkat.get() {
+            return ret(libc_linkat(
+                borrowed_fd(old_dirfd),
+                c_str(old_path),
+                borrowed_fd(new_dirfd),
+                c_str(new_path),
+                bitflags_bits!(flags),
+            ));
+        }
+        // Otherwise, see if we can emulate the `AT_FDCWD` case.
+        if borrowed_fd(old_dirfd) != c::AT_FDCWD || borrowed_fd(new_dirfd) != c::AT_FDCWD {
+            return Err(io::Errno::NOSYS);
+        }
+        if flags.intersects(!AtFlags::SYMLINK_FOLLOW) {
+            return Err(io::Errno::INVAL);
+        }
+        if !flags.is_empty() {
+            return Err(io::Errno::OPNOTSUPP);
+        }
+        ret(c::link(c_str(old_path), c_str(new_path)))
+    }
+
+    #[cfg(not(target_os = "macos"))]
+    unsafe {
+        ret(c::linkat(
+            borrowed_fd(old_dirfd),
+            c_str(old_path),
+            borrowed_fd(new_dirfd),
+            c_str(new_path),
+            bitflags_bits!(flags),
+        ))
+    }
+}
+
+pub(crate) fn rmdir(path: &CStr) -> io::Result<()> {
+    unsafe { ret(c::rmdir(c_str(path))) }
+}
+
+pub(crate) fn unlink(path: &CStr) -> io::Result<()> {
+    unsafe { ret(c::unlink(c_str(path))) }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "redox")))]
+pub(crate) fn unlinkat(dirfd: BorrowedFd<'_>, path: &CStr, flags: AtFlags) -> io::Result<()> {
+    // macOS <= 10.9 lacks `unlinkat`.
+    #[cfg(target_os = "macos")]
+    unsafe {
+        weak! {
+            fn unlinkat(
+                c::c_int,
+                *const c::c_char,
+                c::c_int
+            ) -> c::c_int
+        }
+        // If we have `unlinkat`, use it.
+        if let Some(libc_unlinkat) = unlinkat.get() {
+            return ret(libc_unlinkat(
+                borrowed_fd(dirfd),
+                c_str(path),
+                bitflags_bits!(flags),
+            ));
+        }
+        // Otherwise, see if we can emulate the `AT_FDCWD` case.
+        if borrowed_fd(dirfd) != c::AT_FDCWD {
+            return Err(io::Errno::NOSYS);
+        }
+        if flags.intersects(!AtFlags::REMOVEDIR) {
+            return Err(io::Errno::INVAL);
+        }
+        if flags.contains(AtFlags::REMOVEDIR) {
+            ret(c::rmdir(c_str(path)))
+        } else {
+            ret(c::unlink(c_str(path)))
+        }
+    }
+
+    #[cfg(not(target_os = "macos"))]
+    unsafe {
+        ret(c::unlinkat(
+            borrowed_fd(dirfd),
+            c_str(path),
+            bitflags_bits!(flags),
+        ))
+    }
+}
+
+pub(crate) fn rename(old_path: &CStr, new_path: &CStr) -> io::Result<()> {
+    unsafe { ret(c::rename(c_str(old_path), c_str(new_path))) }
+}
+
+#[cfg(not(target_os = "redox"))]
+pub(crate) fn renameat(
+    old_dirfd: BorrowedFd<'_>,
+    old_path: &CStr,
+    new_dirfd: BorrowedFd<'_>,
+    new_path: &CStr,
+) -> io::Result<()> {
+    // macOS <= 10.9 lacks `renameat`.
+    #[cfg(target_os = "macos")]
+    unsafe {
+        weak! {
+            fn renameat(
+                c::c_int,
+                *const c::c_char,
+                c::c_int,
+                *const c::c_char
+            ) -> c::c_int
+        }
+        // If we have `renameat`, use it.
+        if let Some(libc_renameat) = renameat.get() {
+            return ret(libc_renameat(
+                borrowed_fd(old_dirfd),
+                c_str(old_path),
+                borrowed_fd(new_dirfd),
+                c_str(new_path),
+            ));
+        }
+        // Otherwise, see if we can emulate the `AT_FDCWD` case.
+        if borrowed_fd(old_dirfd) != c::AT_FDCWD || borrowed_fd(new_dirfd) != c::AT_FDCWD {
+            return Err(io::Errno::NOSYS);
+        }
+        ret(c::rename(c_str(old_path), c_str(new_path)))
+    }
+
+    #[cfg(not(target_os = "macos"))]
+    unsafe {
+        ret(c::renameat(
+            borrowed_fd(old_dirfd),
+            c_str(old_path),
+            borrowed_fd(new_dirfd),
+            c_str(new_path),
+        ))
+    }
+}
+
+#[cfg(all(target_os = "linux", target_env = "gnu"))]
+pub(crate) fn renameat2(
+    old_dirfd: BorrowedFd<'_>,
+    old_path: &CStr,
+    new_dirfd: BorrowedFd<'_>,
+    new_path: &CStr,
+    flags: RenameFlags,
+) -> io::Result<()> {
+    // `renameat2` wasn't supported in glibc until 2.28.
+    weak_or_syscall! {
+        fn renameat2(
+            olddirfd: c::c_int,
+            oldpath: *const c::c_char,
+            newdirfd: c::c_int,
+            newpath: *const c::c_char,
+            flags: c::c_uint
+        ) via SYS_renameat2 -> c::c_int
+    }
+
+    unsafe {
+        ret(renameat2(
+            borrowed_fd(old_dirfd),
+            c_str(old_path),
+            borrowed_fd(new_dirfd),
+            c_str(new_path),
+            flags.bits(),
+        ))
+    }
+}
+
+#[cfg(any(
+    target_os = "android",
+    all(target_os = "linux", not(target_env = "gnu")),
+))]
+#[inline]
+pub(crate) fn renameat2(
+    old_dirfd: BorrowedFd<'_>,
+    old_path: &CStr,
+    new_dirfd: BorrowedFd<'_>,
+    new_path: &CStr,
+    flags: RenameFlags,
+) -> io::Result<()> {
+    // At present, `libc` only has `renameat2` defined for glibc. If we have
+    // no flags, we can use plain `renameat`, but otherwise we use `syscall!`.
+    // to call `renameat2` ourselves.
+    if flags.is_empty() {
+        renameat(old_dirfd, old_path, new_dirfd, new_path)
+    } else {
+        syscall! {
+            fn renameat2(
+                olddirfd: c::c_int,
+                oldpath: *const c::c_char,
+                newdirfd: c::c_int,
+                newpath: *const c::c_char,
+                flags: c::c_uint
+            ) via SYS_renameat2 -> c::c_int
+        }
+
+        unsafe {
+            ret(renameat2(
+                borrowed_fd(old_dirfd),
+                c_str(old_path),
+                borrowed_fd(new_dirfd),
+                c_str(new_path),
+                flags.bits(),
+            ))
+        }
+    }
+}
+
+pub(crate) fn symlink(old_path: &CStr, new_path: &CStr) -> io::Result<()> {
+    unsafe { ret(c::symlink(c_str(old_path), c_str(new_path))) }
+}
+
+#[cfg(not(target_os = "redox"))]
+pub(crate) fn symlinkat(
+    old_path: &CStr,
+    new_dirfd: BorrowedFd<'_>,
+    new_path: &CStr,
+) -> io::Result<()> {
+    unsafe {
+        ret(c::symlinkat(
+            c_str(old_path),
+            borrowed_fd(new_dirfd),
+            c_str(new_path),
+        ))
+    }
+}
+
+pub(crate) fn stat(path: &CStr) -> io::Result<Stat> {
+    // See the comments in `fstat` about using `crate::fs::statx` here.
+    #[cfg(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    ))]
+    {
+        match crate::fs::statx(
+            crate::fs::CWD,
+            path,
+            AtFlags::empty(),
+            StatxFlags::BASIC_STATS,
+        ) {
+            Ok(x) => statx_to_stat(x),
+            Err(io::Errno::NOSYS) => statat_old(crate::fs::CWD, path, AtFlags::empty()),
+            Err(err) => Err(err),
+        }
+    }
+
+    // Main version: libc is y2038 safe. Or, the platform is not y2038 safe and
+    // there's nothing practical we can do.
+    #[cfg(not(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    )))]
+    unsafe {
+        let mut stat = MaybeUninit::<Stat>::uninit();
+        ret(c::stat(c_str(path), stat.as_mut_ptr()))?;
+        Ok(stat.assume_init())
+    }
+}
+
+pub(crate) fn lstat(path: &CStr) -> io::Result<Stat> {
+    // See the comments in `fstat` about using `crate::fs::statx` here.
+    #[cfg(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    ))]
+    {
+        match crate::fs::statx(
+            crate::fs::CWD,
+            path,
+            AtFlags::SYMLINK_NOFOLLOW,
+            StatxFlags::BASIC_STATS,
+        ) {
+            Ok(x) => statx_to_stat(x),
+            Err(io::Errno::NOSYS) => statat_old(crate::fs::CWD, path, AtFlags::SYMLINK_NOFOLLOW),
+            Err(err) => Err(err),
+        }
+    }
+
+    // Main version: libc is y2038 safe. Or, the platform is not y2038 safe and
+    // there's nothing practical we can do.
+    #[cfg(not(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    )))]
+    unsafe {
+        let mut stat = MaybeUninit::<Stat>::uninit();
+        ret(c::lstat(c_str(path), stat.as_mut_ptr()))?;
+        Ok(stat.assume_init())
+    }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "redox")))]
+pub(crate) fn statat(dirfd: BorrowedFd<'_>, path: &CStr, flags: AtFlags) -> io::Result<Stat> {
+    // See the comments in `fstat` about using `crate::fs::statx` here.
+    #[cfg(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    ))]
+    {
+        match crate::fs::statx(dirfd, path, flags, StatxFlags::BASIC_STATS) {
+            Ok(x) => statx_to_stat(x),
+            Err(io::Errno::NOSYS) => statat_old(dirfd, path, flags),
+            Err(err) => Err(err),
+        }
+    }
+
+    // Main version: libc is y2038 safe. Or, the platform is not y2038 safe and
+    // there's nothing practical we can do.
+    #[cfg(not(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    )))]
+    unsafe {
+        let mut stat = MaybeUninit::<Stat>::uninit();
+        ret(c::fstatat(
+            borrowed_fd(dirfd),
+            c_str(path),
+            stat.as_mut_ptr(),
+            bitflags_bits!(flags),
+        ))?;
+        Ok(stat.assume_init())
+    }
+}
+
+#[cfg(all(
+    linux_kernel,
+    any(
+        target_pointer_width = "32",
+        target_arch = "mips64",
+        target_arch = "mips64r6"
+    )
+))]
+fn statat_old(dirfd: BorrowedFd<'_>, path: &CStr, flags: AtFlags) -> io::Result<Stat> {
+    unsafe {
+        let mut result = MaybeUninit::<c::stat64>::uninit();
+        ret(c::fstatat(
+            borrowed_fd(dirfd),
+            c_str(path),
+            result.as_mut_ptr(),
+            bitflags_bits!(flags),
+        ))?;
+        stat64_to_stat(result.assume_init())
+    }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "emscripten", target_os = "vita")))]
+pub(crate) fn access(path: &CStr, access: Access) -> io::Result<()> {
+    unsafe { ret(c::access(c_str(path), access.bits())) }
+}
+
+#[cfg(not(any(
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita"
+)))]
+pub(crate) fn accessat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    access: Access,
+    flags: AtFlags,
+) -> io::Result<()> {
+    // macOS <= 10.9 lacks `faccessat`.
+    #[cfg(target_os = "macos")]
+    unsafe {
+        weak! {
+            fn faccessat(
+                c::c_int,
+                *const c::c_char,
+                c::c_int,
+                c::c_int
+            ) -> c::c_int
+        }
+        // If we have `faccessat`, use it.
+        if let Some(libc_faccessat) = faccessat.get() {
+            return ret(libc_faccessat(
+                borrowed_fd(dirfd),
+                c_str(path),
+                bitflags_bits!(access),
+                bitflags_bits!(flags),
+            ));
+        }
+        // Otherwise, see if we can emulate the `AT_FDCWD` case.
+        if borrowed_fd(dirfd) != c::AT_FDCWD {
+            return Err(io::Errno::NOSYS);
+        }
+        if flags.intersects(!(AtFlags::EACCESS | AtFlags::SYMLINK_NOFOLLOW)) {
+            return Err(io::Errno::INVAL);
+        }
+        if !flags.is_empty() {
+            return Err(io::Errno::OPNOTSUPP);
+        }
+        ret(c::access(c_str(path), bitflags_bits!(access)))
+    }
+
+    #[cfg(not(target_os = "macos"))]
+    unsafe {
+        ret(c::faccessat(
+            borrowed_fd(dirfd),
+            c_str(path),
+            bitflags_bits!(access),
+            bitflags_bits!(flags),
+        ))
+    }
+}
+
+#[cfg(target_os = "emscripten")]
+pub(crate) fn access(_path: &CStr, _access: Access) -> io::Result<()> {
+    Ok(())
+}
+
+#[cfg(target_os = "emscripten")]
+pub(crate) fn accessat(
+    _dirfd: BorrowedFd<'_>,
+    _path: &CStr,
+    _access: Access,
+    _flags: AtFlags,
+) -> io::Result<()> {
+    Ok(())
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "redox", target_os = "vita")))]
+pub(crate) fn utimensat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    times: &Timestamps,
+    flags: AtFlags,
+) -> io::Result<()> {
+    // Old 32-bit version: libc has `utimensat` but it is not y2038 safe by
+    // default. But there may be a `__utimensat16` we can use.
+    #[cfg(fix_y2038)]
+    {
+        #[cfg(target_env = "gnu")]
+        if let Some(libc_utimensat) = __utimensat64.get() {
+            let libc_times: [LibcTimespec; 2] = [
+                times.last_access.clone().into(),
+                times.last_modification.clone().into(),
+            ];
+
+            unsafe {
+                return ret(libc_utimensat(
+                    borrowed_fd(dirfd),
+                    c_str(path),
+                    libc_times.as_ptr(),
+                    bitflags_bits!(flags),
+                ));
+            }
+        }
+
+        utimensat_old(dirfd, path, times, flags)
+    }
+
+    // Main version: libc is y2038 safe and has `utimensat`. Or, the platform
+    // is not y2038 safe and there's nothing practical we can do.
+    #[cfg(not(any(apple, fix_y2038)))]
+    unsafe {
+        use crate::utils::as_ptr;
+
+        ret(c::utimensat(
+            borrowed_fd(dirfd),
+            c_str(path),
+            as_ptr(times).cast(),
+            bitflags_bits!(flags),
+        ))
+    }
+
+    // Apple version: `utimensat` was introduced in macOS 10.13.
+    #[cfg(apple)]
+    unsafe {
+        use crate::utils::as_ptr;
+
+        // ABI details
+        weak! {
+            fn utimensat(
+                c::c_int,
+                *const c::c_char,
+                *const c::timespec,
+                c::c_int
+            ) -> c::c_int
+        }
+        extern "C" {
+            fn setattrlist(
+                path: *const c::c_char,
+                attr_list: *const Attrlist,
+                attr_buf: *const c::c_void,
+                attr_buf_size: c::size_t,
+                options: c::c_ulong,
+            ) -> c::c_int;
+        }
+        const FSOPT_NOFOLLOW: c::c_ulong = 0x0000_0001;
+
+        // If we have `utimensat`, use it.
+        if let Some(have_utimensat) = utimensat.get() {
+            return ret(have_utimensat(
+                borrowed_fd(dirfd),
+                c_str(path),
+                as_ptr(times).cast(),
+                bitflags_bits!(flags),
+            ));
+        }
+
+        // `setattrlistat` was introduced in 10.13 along with `utimensat`, so
+        // if we don't have `utimensat`, we don't have `setattrlistat` either.
+        // Emulate it using `fork`, and `fchdir` and [`setattrlist`].
+        //
+        // [`setattrlist`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setattrlist.2.html
+        match c::fork() {
+            -1 => Err(io::Errno::IO),
+            0 => {
+                if c::fchdir(borrowed_fd(dirfd)) != 0 {
+                    let code = match libc_errno::errno().0 {
+                        c::EACCES => 2,
+                        c::ENOTDIR => 3,
+                        _ => 1,
+                    };
+                    c::_exit(code);
+                }
+
+                let mut flags_arg = 0;
+                if flags.contains(AtFlags::SYMLINK_NOFOLLOW) {
+                    flags_arg |= FSOPT_NOFOLLOW;
+                }
+
+                let (attrbuf_size, times, attrs) = times_to_attrlist(times);
+
+                if setattrlist(
+                    c_str(path),
+                    &attrs,
+                    as_ptr(&times).cast(),
+                    attrbuf_size,
+                    flags_arg,
+                ) != 0
+                {
+                    // Translate expected `errno` codes into ad-hoc integer
+                    // values suitable for exit statuses.
+                    let code = match libc_errno::errno().0 {
+                        c::EACCES => 2,
+                        c::ENOTDIR => 3,
+                        c::EPERM => 4,
+                        c::EROFS => 5,
+                        c::ELOOP => 6,
+                        c::ENOENT => 7,
+                        c::ENAMETOOLONG => 8,
+                        c::EINVAL => 9,
+                        c::ESRCH => 10,
+                        c::ENOTSUP => 11,
+                        _ => 1,
+                    };
+                    c::_exit(code);
+                }
+
+                c::_exit(0);
+            }
+            child_pid => {
+                let mut wstatus = 0;
+                let _ = ret_c_int(c::waitpid(child_pid, &mut wstatus, 0))?;
+                if c::WIFEXITED(wstatus) {
+                    // Translate our ad-hoc exit statuses back to `errno`
+                    // codes.
+                    match c::WEXITSTATUS(wstatus) {
+                        0 => Ok(()),
+                        2 => Err(io::Errno::ACCESS),
+                        3 => Err(io::Errno::NOTDIR),
+                        4 => Err(io::Errno::PERM),
+                        5 => Err(io::Errno::ROFS),
+                        6 => Err(io::Errno::LOOP),
+                        7 => Err(io::Errno::NOENT),
+                        8 => Err(io::Errno::NAMETOOLONG),
+                        9 => Err(io::Errno::INVAL),
+                        10 => Err(io::Errno::SRCH),
+                        11 => Err(io::Errno::NOTSUP),
+                        _ => Err(io::Errno::IO),
+                    }
+                } else {
+                    Err(io::Errno::IO)
+                }
+            }
+        }
+    }
+}
+
+#[cfg(fix_y2038)]
+fn utimensat_old(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    times: &Timestamps,
+    flags: AtFlags,
+) -> io::Result<()> {
+    let old_times = [
+        c::timespec {
+            tv_sec: times
+                .last_access
+                .tv_sec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+            tv_nsec: times
+                .last_access
+                .tv_nsec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+        },
+        c::timespec {
+            tv_sec: times
+                .last_modification
+                .tv_sec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+            tv_nsec: times
+                .last_modification
+                .tv_nsec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+        },
+    ];
+    unsafe {
+        ret(c::utimensat(
+            borrowed_fd(dirfd),
+            c_str(path),
+            old_times.as_ptr(),
+            bitflags_bits!(flags),
+        ))
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+pub(crate) fn chmod(path: &CStr, mode: Mode) -> io::Result<()> {
+    unsafe { ret(c::chmod(c_str(path), mode.bits() as c::mode_t)) }
+}
+
+#[cfg(not(any(
+    linux_kernel,
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "wasi"
+)))]
+pub(crate) fn chmodat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    mode: Mode,
+    flags: AtFlags,
+) -> io::Result<()> {
+    unsafe {
+        ret(c::fchmodat(
+            borrowed_fd(dirfd),
+            c_str(path),
+            mode.bits() as c::mode_t,
+            bitflags_bits!(flags),
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+pub(crate) fn chmodat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    mode: Mode,
+    flags: AtFlags,
+) -> io::Result<()> {
+    // Linux's `fchmodat` does not have a flags argument.
+    //
+    // Use `c::syscall` rather than `c::fchmodat` because some libc
+    // implementations, such as musl, add extra logic to `fchmod` to emulate
+    // support for `AT_SYMLINK_NOFOLLOW`, which uses `/proc` outside our
+    // control.
+    syscall! {
+        fn fchmodat(
+            base_dirfd: c::c_int,
+            pathname: *const c::c_char,
+            mode: c::mode_t
+        ) via SYS_fchmodat -> c::c_int
+    }
+    if flags == AtFlags::SYMLINK_NOFOLLOW {
+        return Err(io::Errno::OPNOTSUPP);
+    }
+    if !flags.is_empty() {
+        return Err(io::Errno::INVAL);
+    }
+    unsafe {
+        ret(fchmodat(
+            borrowed_fd(dirfd),
+            c_str(path),
+            mode.bits() as c::mode_t,
+        ))
+    }
+}
+
+#[cfg(apple)]
+pub(crate) fn fclonefileat(
+    srcfd: BorrowedFd<'_>,
+    dst_dirfd: BorrowedFd<'_>,
+    dst: &CStr,
+    flags: CloneFlags,
+) -> io::Result<()> {
+    syscall! {
+        fn fclonefileat(
+            srcfd: BorrowedFd<'_>,
+            dst_dirfd: BorrowedFd<'_>,
+            dst: *const c::c_char,
+            flags: c::c_int
+        ) via SYS_fclonefileat -> c::c_int
+    }
+
+    unsafe {
+        ret(fclonefileat(
+            srcfd,
+            dst_dirfd,
+            c_str(dst),
+            bitflags_bits!(flags),
+        ))
+    }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "redox", target_os = "wasi")))]
+pub(crate) fn chownat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    owner: Option<Uid>,
+    group: Option<Gid>,
+    flags: AtFlags,
+) -> io::Result<()> {
+    unsafe {
+        let (ow, gr) = crate::ugid::translate_fchown_args(owner, group);
+        ret(c::fchownat(
+            borrowed_fd(dirfd),
+            c_str(path),
+            ow,
+            gr,
+            bitflags_bits!(flags),
+        ))
+    }
+}
+
+#[cfg(not(any(
+    apple,
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+pub(crate) fn mknodat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    file_type: FileType,
+    mode: Mode,
+    dev: Dev,
+) -> io::Result<()> {
+    unsafe {
+        ret(c::mknodat(
+            borrowed_fd(dirfd),
+            c_str(path),
+            (mode.bits() | file_type.as_raw_mode()) as c::mode_t,
+            dev.try_into().map_err(|_e| io::Errno::PERM)?,
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+pub(crate) fn copy_file_range(
+    fd_in: BorrowedFd<'_>,
+    off_in: Option<&mut u64>,
+    fd_out: BorrowedFd<'_>,
+    off_out: Option<&mut u64>,
+    len: usize,
+) -> io::Result<usize> {
+    syscall! {
+        fn copy_file_range(
+            fd_in: c::c_int,
+            off_in: *mut c::loff_t,
+            fd_out: c::c_int,
+            off_out: *mut c::loff_t,
+            len: usize,
+            flags: c::c_uint
+        ) via SYS_copy_file_range -> c::ssize_t
+    }
+
+    let mut off_in_val: c::loff_t = 0;
+    let mut off_out_val: c::loff_t = 0;
+    // Silently cast; we'll get `EINVAL` if the value is negative.
+    let off_in_ptr = if let Some(off_in) = &off_in {
+        off_in_val = **off_in as i64;
+        &mut off_in_val
+    } else {
+        null_mut()
+    };
+    let off_out_ptr = if let Some(off_out) = &off_out {
+        off_out_val = **off_out as i64;
+        &mut off_out_val
+    } else {
+        null_mut()
+    };
+    let copied = unsafe {
+        ret_usize(copy_file_range(
+            borrowed_fd(fd_in),
+            off_in_ptr,
+            borrowed_fd(fd_out),
+            off_out_ptr,
+            len,
+            0, // no flags are defined yet
+        ))?
+    };
+    if let Some(off_in) = off_in {
+        *off_in = off_in_val as u64;
+    }
+    if let Some(off_out) = off_out {
+        *off_out = off_out_val as u64;
+    }
+    Ok(copied)
+}
+
+#[cfg(not(any(
+    apple,
+    netbsdlike,
+    solarish,
+    target_os = "dragonfly",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "redox",
+    target_os = "vita",
+)))]
+pub(crate) fn fadvise(fd: BorrowedFd<'_>, offset: u64, len: u64, advice: Advice) -> io::Result<()> {
+    let offset = offset as i64;
+    let len = len as i64;
+
+    // FreeBSD returns `EINVAL` on invalid offsets; emulate the POSIX behavior.
+    #[cfg(target_os = "freebsd")]
+    let offset = if (offset as i64) < 0 {
+        i64::MAX
+    } else {
+        offset
+    };
+
+    // FreeBSD returns `EINVAL` on overflow; emulate the POSIX behavior.
+    #[cfg(target_os = "freebsd")]
+    let len = if len > 0 && offset.checked_add(len).is_none() {
+        i64::MAX - offset
+    } else {
+        len
+    };
+
+    let err = unsafe { c::posix_fadvise(borrowed_fd(fd), offset, len, advice as c::c_int) };
+
+    // `posix_fadvise` returns its error status rather than using `errno`.
+    if err == 0 {
+        Ok(())
+    } else {
+        Err(io::Errno(err))
+    }
+}
+
+pub(crate) fn fcntl_getfl(fd: BorrowedFd<'_>) -> io::Result<OFlags> {
+    let flags = unsafe { ret_c_int(c::fcntl(borrowed_fd(fd), c::F_GETFL))? };
+    Ok(OFlags::from_bits_retain(bitcast!(flags)))
+}
+
+pub(crate) fn fcntl_setfl(fd: BorrowedFd<'_>, flags: OFlags) -> io::Result<()> {
+    unsafe { ret(c::fcntl(borrowed_fd(fd), c::F_SETFL, flags.bits())) }
+}
+
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
+pub(crate) fn fcntl_get_seals(fd: BorrowedFd<'_>) -> io::Result<SealFlags> {
+    let flags = unsafe { ret_c_int(c::fcntl(borrowed_fd(fd), c::F_GET_SEALS))? };
+    Ok(SealFlags::from_bits_retain(bitcast!(flags)))
+}
+
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
+pub(crate) fn fcntl_add_seals(fd: BorrowedFd<'_>, seals: SealFlags) -> io::Result<()> {
+    unsafe { ret(c::fcntl(borrowed_fd(fd), c::F_ADD_SEALS, seals.bits())) }
+}
+
+#[cfg(not(any(
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+pub(crate) fn fcntl_lock(fd: BorrowedFd<'_>, operation: FlockOperation) -> io::Result<()> {
+    use c::{flock, F_RDLCK, F_SETLK, F_SETLKW, F_UNLCK, F_WRLCK, SEEK_SET};
+
+    let (cmd, l_type) = match operation {
+        FlockOperation::LockShared => (F_SETLKW, F_RDLCK),
+        FlockOperation::LockExclusive => (F_SETLKW, F_WRLCK),
+        FlockOperation::Unlock => (F_SETLKW, F_UNLCK),
+        FlockOperation::NonBlockingLockShared => (F_SETLK, F_RDLCK),
+        FlockOperation::NonBlockingLockExclusive => (F_SETLK, F_WRLCK),
+        FlockOperation::NonBlockingUnlock => (F_SETLK, F_UNLCK),
+    };
+
+    unsafe {
+        let mut lock: flock = core::mem::zeroed();
+        lock.l_type = l_type as _;
+
+        // When `l_len` is zero, this locks all the bytes from
+        // `l_whence`/`l_start` to the end of the file, even as the
+        // file grows dynamically.
+        lock.l_whence = SEEK_SET as _;
+        lock.l_start = 0;
+        lock.l_len = 0;
+
+        ret(c::fcntl(borrowed_fd(fd), cmd, &lock))
+    }
+}
+
+pub(crate) fn seek(fd: BorrowedFd<'_>, pos: SeekFrom) -> io::Result<u64> {
+    let (whence, offset) = match pos {
+        SeekFrom::Start(pos) => {
+            let pos: u64 = pos;
+            // Silently cast; we'll get `EINVAL` if the value is negative.
+            (c::SEEK_SET, pos as i64)
+        }
+        SeekFrom::End(offset) => (c::SEEK_END, offset),
+        SeekFrom::Current(offset) => (c::SEEK_CUR, offset),
+        #[cfg(any(apple, freebsdlike, linux_kernel, solarish))]
+        SeekFrom::Data(offset) => (c::SEEK_DATA, offset),
+        #[cfg(any(apple, freebsdlike, linux_kernel, solarish))]
+        SeekFrom::Hole(offset) => (c::SEEK_HOLE, offset),
+    };
+
+    // ESP-IDF and Vita don't support 64-bit offsets.
+    #[cfg(any(target_os = "espidf", target_os = "vita"))]
+    let offset: i32 = offset.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+
+    let offset = unsafe { ret_off_t(c::lseek(borrowed_fd(fd), offset, whence))? };
+    Ok(offset as u64)
+}
+
+pub(crate) fn tell(fd: BorrowedFd<'_>) -> io::Result<u64> {
+    let offset = unsafe { ret_off_t(c::lseek(borrowed_fd(fd), 0, c::SEEK_CUR))? };
+    Ok(offset as u64)
+}
+
+#[cfg(not(any(linux_kernel, target_os = "wasi")))]
+pub(crate) fn fchmod(fd: BorrowedFd<'_>, mode: Mode) -> io::Result<()> {
+    unsafe { ret(c::fchmod(borrowed_fd(fd), bitflags_bits!(mode))) }
+}
+
+#[cfg(linux_kernel)]
+pub(crate) fn fchmod(fd: BorrowedFd<'_>, mode: Mode) -> io::Result<()> {
+    // Use `c::syscall` rather than `c::fchmod` because some libc
+    // implementations, such as musl, add extra logic to `fchmod` to emulate
+    // support for `O_PATH`, which uses `/proc` outside our control and
+    // interferes with our own use of `O_PATH`.
+    syscall! {
+        fn fchmod(
+            fd: c::c_int,
+            mode: c::mode_t
+        ) via SYS_fchmod -> c::c_int
+    }
+    unsafe { ret(fchmod(borrowed_fd(fd), mode.bits() as c::mode_t)) }
+}
+
+#[cfg(not(target_os = "wasi"))]
+pub(crate) fn chown(path: &CStr, owner: Option<Uid>, group: Option<Gid>) -> io::Result<()> {
+    unsafe {
+        let (ow, gr) = crate::ugid::translate_fchown_args(owner, group);
+        ret(c::chown(c_str(path), ow, gr))
+    }
+}
+
+#[cfg(linux_kernel)]
+pub(crate) fn fchown(fd: BorrowedFd<'_>, owner: Option<Uid>, group: Option<Gid>) -> io::Result<()> {
+    // Use `c::syscall` rather than `c::fchown` because some libc
+    // implementations, such as musl, add extra logic to `fchown` to emulate
+    // support for `O_PATH`, which uses `/proc` outside our control and
+    // interferes with our own use of `O_PATH`.
+    syscall! {
+        fn fchown(
+            fd: c::c_int,
+            owner: c::uid_t,
+            group: c::gid_t
+        ) via SYS_fchown -> c::c_int
+    }
+    unsafe {
+        let (ow, gr) = crate::ugid::translate_fchown_args(owner, group);
+        ret(fchown(borrowed_fd(fd), ow, gr))
+    }
+}
+
+#[cfg(not(any(linux_kernel, target_os = "wasi")))]
+pub(crate) fn fchown(fd: BorrowedFd<'_>, owner: Option<Uid>, group: Option<Gid>) -> io::Result<()> {
+    unsafe {
+        let (ow, gr) = crate::ugid::translate_fchown_args(owner, group);
+        ret(c::fchown(borrowed_fd(fd), ow, gr))
+    }
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "solaris",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+pub(crate) fn flock(fd: BorrowedFd<'_>, operation: FlockOperation) -> io::Result<()> {
+    unsafe { ret(c::flock(borrowed_fd(fd), operation as c::c_int)) }
+}
+
+#[cfg(linux_kernel)]
+pub(crate) fn syncfs(fd: BorrowedFd<'_>) -> io::Result<()> {
+    // Some versions of Android libc lack a `syncfs` function.
+    #[cfg(target_os = "android")]
+    syscall! {
+        fn syncfs(fd: c::c_int) via SYS_syncfs -> c::c_int
+    }
+
+    // `syncfs` was added to glibc in 2.20.
+    #[cfg(not(target_os = "android"))]
+    weak_or_syscall! {
+        fn syncfs(fd: c::c_int) via SYS_syncfs -> c::c_int
+    }
+
+    unsafe { ret(syncfs(borrowed_fd(fd))) }
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+pub(crate) fn sync() {
+    unsafe { c::sync() }
+}
+
+pub(crate) fn fstat(fd: BorrowedFd<'_>) -> io::Result<Stat> {
+    // 32-bit and mips64 Linux: `struct stat64` is not y2038 compatible; use
+    // `statx`.
+    //
+    // And, some old platforms don't support `statx`, and some fail with a
+    // confusing error code, so we call `crate::fs::statx` to handle that. If
+    // `statx` isn't available, fall back to the buggy system call.
+    #[cfg(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    ))]
+    {
+        match crate::fs::statx(fd, cstr!(""), AtFlags::EMPTY_PATH, StatxFlags::BASIC_STATS) {
+            Ok(x) => statx_to_stat(x),
+            Err(io::Errno::NOSYS) => fstat_old(fd),
+            Err(err) => Err(err),
+        }
+    }
+
+    // Main version: libc is y2038 safe. Or, the platform is not y2038 safe and
+    // there's nothing practical we can do.
+    #[cfg(not(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    )))]
+    unsafe {
+        let mut stat = MaybeUninit::<Stat>::uninit();
+        ret(c::fstat(borrowed_fd(fd), stat.as_mut_ptr()))?;
+        Ok(stat.assume_init())
+    }
+}
+
+#[cfg(all(
+    linux_kernel,
+    any(
+        target_pointer_width = "32",
+        target_arch = "mips64",
+        target_arch = "mips64r6"
+    )
+))]
+fn fstat_old(fd: BorrowedFd<'_>) -> io::Result<Stat> {
+    unsafe {
+        let mut result = MaybeUninit::<c::stat64>::uninit();
+        ret(c::fstat(borrowed_fd(fd), result.as_mut_ptr()))?;
+        stat64_to_stat(result.assume_init())
+    }
+}
+
+#[cfg(not(any(
+    solarish,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "netbsd",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+pub(crate) fn fstatfs(fd: BorrowedFd<'_>) -> io::Result<StatFs> {
+    let mut statfs = MaybeUninit::<StatFs>::uninit();
+    unsafe {
+        ret(c::fstatfs(borrowed_fd(fd), statfs.as_mut_ptr()))?;
+        Ok(statfs.assume_init())
+    }
+}
+
+#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+pub(crate) fn fstatvfs(fd: BorrowedFd<'_>) -> io::Result<StatVfs> {
+    let mut statvfs = MaybeUninit::<c::statvfs>::uninit();
+    unsafe {
+        ret(c::fstatvfs(borrowed_fd(fd), statvfs.as_mut_ptr()))?;
+        Ok(libc_statvfs_to_statvfs(statvfs.assume_init()))
+    }
+}
+
+#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+fn libc_statvfs_to_statvfs(from: c::statvfs) -> StatVfs {
+    StatVfs {
+        f_bsize: from.f_bsize as u64,
+        f_frsize: from.f_frsize as u64,
+        f_blocks: from.f_blocks as u64,
+        f_bfree: from.f_bfree as u64,
+        f_bavail: from.f_bavail as u64,
+        f_files: from.f_files as u64,
+        f_ffree: from.f_ffree as u64,
+        f_favail: from.f_ffree as u64,
+        #[cfg(not(target_os = "aix"))]
+        f_fsid: from.f_fsid as u64,
+        #[cfg(target_os = "aix")]
+        f_fsid: ((from.f_fsid.val[0] as u64) << 32) | from.f_fsid.val[1],
+        f_flag: StatVfsMountFlags::from_bits_retain(from.f_flag as u64),
+        f_namemax: from.f_namemax as u64,
+    }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+pub(crate) fn futimens(fd: BorrowedFd<'_>, times: &Timestamps) -> io::Result<()> {
+    // Old 32-bit version: libc has `futimens` but it is not y2038 safe by
+    // default. But there may be a `__futimens64` we can use.
+    #[cfg(fix_y2038)]
+    {
+        #[cfg(target_env = "gnu")]
+        if let Some(libc_futimens) = __futimens64.get() {
+            let libc_times: [LibcTimespec; 2] = [
+                times.last_access.clone().into(),
+                times.last_modification.clone().into(),
+            ];
+
+            unsafe {
+                return ret(libc_futimens(borrowed_fd(fd), libc_times.as_ptr()));
+            }
+        }
+
+        futimens_old(fd, times)
+    }
+
+    // Main version: libc is y2038 safe and has `futimens`. Or, the platform
+    // is not y2038 safe and there's nothing practical we can do.
+    #[cfg(not(any(apple, fix_y2038)))]
+    unsafe {
+        use crate::utils::as_ptr;
+
+        ret(c::futimens(borrowed_fd(fd), as_ptr(times).cast()))
+    }
+
+    // Apple version: `futimens` was introduced in macOS 10.13.
+    #[cfg(apple)]
+    unsafe {
+        use crate::utils::as_ptr;
+
+        // ABI details.
+        weak! {
+            fn futimens(c::c_int, *const c::timespec) -> c::c_int
+        }
+        extern "C" {
+            fn fsetattrlist(
+                fd: c::c_int,
+                attr_list: *const Attrlist,
+                attr_buf: *const c::c_void,
+                attr_buf_size: c::size_t,
+                options: c::c_ulong,
+            ) -> c::c_int;
+        }
+
+        // If we have `futimens`, use it.
+        if let Some(have_futimens) = futimens.get() {
+            return ret(have_futimens(borrowed_fd(fd), as_ptr(times).cast()));
+        }
+
+        // Otherwise use `fsetattrlist`.
+        let (attrbuf_size, times, attrs) = times_to_attrlist(times);
+
+        ret(fsetattrlist(
+            borrowed_fd(fd),
+            &attrs,
+            as_ptr(&times).cast(),
+            attrbuf_size,
+            0,
+        ))
+    }
+}
+
+#[cfg(fix_y2038)]
+fn futimens_old(fd: BorrowedFd<'_>, times: &Timestamps) -> io::Result<()> {
+    let old_times = [
+        c::timespec {
+            tv_sec: times
+                .last_access
+                .tv_sec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+            tv_nsec: times
+                .last_access
+                .tv_nsec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+        },
+        c::timespec {
+            tv_sec: times
+                .last_modification
+                .tv_sec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+            tv_nsec: times
+                .last_modification
+                .tv_nsec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+        },
+    ];
+
+    unsafe { ret(c::futimens(borrowed_fd(fd), old_times.as_ptr())) }
+}
+
+#[cfg(not(any(
+    apple,
+    netbsdlike,
+    solarish,
+    target_os = "aix",
+    target_os = "dragonfly",
+    target_os = "espidf",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+)))]
+pub(crate) fn fallocate(
+    fd: BorrowedFd<'_>,
+    mode: FallocateFlags,
+    offset: u64,
+    len: u64,
+) -> io::Result<()> {
+    // Silently cast; we'll get `EINVAL` if the value is negative.
+    let offset = offset as i64;
+    let len = len as i64;
+
+    #[cfg(any(linux_kernel, target_os = "fuchsia"))]
+    unsafe {
+        ret(c::fallocate(
+            borrowed_fd(fd),
+            bitflags_bits!(mode),
+            offset,
+            len,
+        ))
+    }
+
+    #[cfg(not(any(linux_kernel, target_os = "fuchsia")))]
+    {
+        assert!(mode.is_empty());
+        let err = unsafe { c::posix_fallocate(borrowed_fd(fd), offset, len) };
+
+        // `posix_fallocate` returns its error status rather than using
+        // `errno`.
+        if err == 0 {
+            Ok(())
+        } else {
+            Err(io::Errno(err))
+        }
+    }
+}
+
+#[cfg(apple)]
+pub(crate) fn fallocate(
+    fd: BorrowedFd<'_>,
+    mode: FallocateFlags,
+    offset: u64,
+    len: u64,
+) -> io::Result<()> {
+    let offset: i64 = offset.try_into().map_err(|_e| io::Errno::INVAL)?;
+    let len = len as i64;
+
+    assert!(mode.is_empty());
+
+    let new_len = offset.checked_add(len).ok_or(io::Errno::FBIG)?;
+    let mut store = c::fstore_t {
+        fst_flags: c::F_ALLOCATECONTIG,
+        fst_posmode: c::F_PEOFPOSMODE,
+        fst_offset: 0,
+        fst_length: new_len,
+        fst_bytesalloc: 0,
+    };
+    unsafe {
+        if c::fcntl(borrowed_fd(fd), c::F_PREALLOCATE, &store) == -1 {
+            // Unable to allocate contiguous disk space; attempt to allocate
+            // non-contiguously.
+            store.fst_flags = c::F_ALLOCATEALL;
+            let _ = ret_c_int(c::fcntl(borrowed_fd(fd), c::F_PREALLOCATE, &store))?;
+        }
+        ret(c::ftruncate(borrowed_fd(fd), new_len))
+    }
+}
+
+pub(crate) fn fsync(fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe { ret(c::fsync(borrowed_fd(fd))) }
+}
+
+#[cfg(not(any(
+    apple,
+    target_os = "dragonfly",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "redox",
+    target_os = "vita",
+)))]
+pub(crate) fn fdatasync(fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe { ret(c::fdatasync(borrowed_fd(fd))) }
+}
+
+pub(crate) fn ftruncate(fd: BorrowedFd<'_>, length: u64) -> io::Result<()> {
+    let length = length.try_into().map_err(|_overflow_err| io::Errno::FBIG)?;
+    unsafe { ret(c::ftruncate(borrowed_fd(fd), length)) }
+}
+
+#[cfg(any(linux_kernel, target_os = "freebsd"))]
+pub(crate) fn memfd_create(name: &CStr, flags: MemfdFlags) -> io::Result<OwnedFd> {
+    #[cfg(target_os = "freebsd")]
+    weakcall! {
+        fn memfd_create(
+            name: *const c::c_char,
+            flags: c::c_uint
+        ) -> c::c_int
+    }
+
+    #[cfg(linux_kernel)]
+    weak_or_syscall! {
+        fn memfd_create(
+            name: *const c::c_char,
+            flags: c::c_uint
+        ) via SYS_memfd_create -> c::c_int
+    }
+
+    unsafe { ret_owned_fd(memfd_create(c_str(name), bitflags_bits!(flags))) }
+}
+
+#[cfg(linux_kernel)]
+pub(crate) fn openat2(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    oflags: OFlags,
+    mode: Mode,
+    resolve: ResolveFlags,
+) -> io::Result<OwnedFd> {
+    use linux_raw_sys::general::open_how;
+
+    syscall! {
+        fn openat2(
+            base_dirfd: c::c_int,
+            pathname: *const c::c_char,
+            how: *mut open_how,
+            size: usize
+        ) via SYS_OPENAT2 -> c::c_int
+    }
+
+    let oflags = oflags.bits();
+    let mut open_how = open_how {
+        flags: u64::from(oflags),
+        mode: u64::from(mode.bits()),
+        resolve: resolve.bits(),
+    };
+
+    unsafe {
+        ret_owned_fd(openat2(
+            borrowed_fd(dirfd),
+            c_str(path),
+            &mut open_how,
+            size_of::<open_how>(),
+        ))
+    }
+}
+#[cfg(all(linux_kernel, target_pointer_width = "32"))]
+const SYS_OPENAT2: i32 = 437;
+#[cfg(all(linux_kernel, target_pointer_width = "64"))]
+const SYS_OPENAT2: i64 = 437;
+
+#[cfg(target_os = "linux")]
+pub(crate) fn sendfile(
+    out_fd: BorrowedFd<'_>,
+    in_fd: BorrowedFd<'_>,
+    offset: Option<&mut u64>,
+    count: usize,
+) -> io::Result<usize> {
+    unsafe {
+        ret_usize(c::sendfile64(
+            borrowed_fd(out_fd),
+            borrowed_fd(in_fd),
+            offset.map_or(null_mut(), crate::utils::as_mut_ptr).cast(),
+            count,
+        ))
+    }
+}
+
+/// Convert from a Linux `statx` value to rustix's `Stat`.
+#[cfg(all(linux_kernel, target_pointer_width = "32"))]
+fn statx_to_stat(x: crate::fs::Statx) -> io::Result<Stat> {
+    Ok(Stat {
+        st_dev: crate::fs::makedev(x.stx_dev_major, x.stx_dev_minor).into(),
+        st_mode: x.stx_mode.into(),
+        st_nlink: x.stx_nlink.into(),
+        st_uid: x.stx_uid.into(),
+        st_gid: x.stx_gid.into(),
+        st_rdev: crate::fs::makedev(x.stx_rdev_major, x.stx_rdev_minor).into(),
+        st_size: x.stx_size.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_blksize: x.stx_blksize.into(),
+        st_blocks: x.stx_blocks.into(),
+        st_atime: x
+            .stx_atime
+            .tv_sec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        st_atime_nsec: x.stx_atime.tv_nsec as _,
+        st_mtime: x
+            .stx_mtime
+            .tv_sec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        st_mtime_nsec: x.stx_mtime.tv_nsec as _,
+        st_ctime: x
+            .stx_ctime
+            .tv_sec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        st_ctime_nsec: x.stx_ctime.tv_nsec as _,
+        st_ino: x.stx_ino.into(),
+    })
+}
+
+/// Convert from a Linux `statx` value to rustix's `Stat`.
+///
+/// mips64' `struct stat64` in libc has private fields, and `stx_blocks`
+#[cfg(all(linux_kernel, any(target_arch = "mips64", target_arch = "mips64r6")))]
+fn statx_to_stat(x: crate::fs::Statx) -> io::Result<Stat> {
+    let mut result: Stat = unsafe { core::mem::zeroed() };
+
+    result.st_dev = crate::fs::makedev(x.stx_dev_major, x.stx_dev_minor);
+    result.st_mode = x.stx_mode.into();
+    result.st_nlink = x.stx_nlink.into();
+    result.st_uid = x.stx_uid.into();
+    result.st_gid = x.stx_gid.into();
+    result.st_rdev = crate::fs::makedev(x.stx_rdev_major, x.stx_rdev_minor);
+    result.st_size = x.stx_size.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_blksize = x.stx_blksize.into();
+    result.st_blocks = x.stx_blocks.try_into().map_err(|_e| io::Errno::OVERFLOW)?;
+    result.st_atime = x
+        .stx_atime
+        .tv_sec
+        .try_into()
+        .map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_atime_nsec = x.stx_atime.tv_nsec as _;
+    result.st_mtime = x
+        .stx_mtime
+        .tv_sec
+        .try_into()
+        .map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_mtime_nsec = x.stx_mtime.tv_nsec as _;
+    result.st_ctime = x
+        .stx_ctime
+        .tv_sec
+        .try_into()
+        .map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_ctime_nsec = x.stx_ctime.tv_nsec as _;
+    result.st_ino = x.stx_ino.into();
+
+    Ok(result)
+}
+
+/// Convert from a Linux `stat64` value to rustix's `Stat`.
+#[cfg(all(linux_kernel, target_pointer_width = "32"))]
+fn stat64_to_stat(s64: c::stat64) -> io::Result<Stat> {
+    Ok(Stat {
+        st_dev: s64.st_dev.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_mode: s64.st_mode.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_nlink: s64.st_nlink.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_uid: s64.st_uid.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_gid: s64.st_gid.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_rdev: s64.st_rdev.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_size: s64.st_size.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_blksize: s64.st_blksize.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_blocks: s64.st_blocks.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_atime: s64.st_atime.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_atime_nsec: s64
+            .st_atime_nsec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        st_mtime: s64.st_mtime.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_mtime_nsec: s64
+            .st_mtime_nsec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        st_ctime: s64.st_ctime.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_ctime_nsec: s64
+            .st_ctime_nsec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        st_ino: s64.st_ino.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+    })
+}
+
+/// Convert from a Linux `stat64` value to rustix's `Stat`.
+///
+/// mips64' `struct stat64` in libc has private fields, and `st_blocks` has
+/// type `i64`.
+#[cfg(all(linux_kernel, any(target_arch = "mips64", target_arch = "mips64r6")))]
+fn stat64_to_stat(s64: c::stat64) -> io::Result<Stat> {
+    let mut result: Stat = unsafe { core::mem::zeroed() };
+
+    result.st_dev = s64.st_dev.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_mode = s64.st_mode.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_nlink = s64.st_nlink.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_uid = s64.st_uid.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_gid = s64.st_gid.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_rdev = s64.st_rdev.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_size = s64.st_size.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_blksize = s64.st_blksize.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_blocks = s64.st_blocks.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_atime = s64.st_atime.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_atime_nsec = s64
+        .st_atime_nsec
+        .try_into()
+        .map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_mtime = s64.st_mtime.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_mtime_nsec = s64
+        .st_mtime_nsec
+        .try_into()
+        .map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_ctime = s64.st_ctime.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_ctime_nsec = s64
+        .st_ctime_nsec
+        .try_into()
+        .map_err(|_| io::Errno::OVERFLOW)?;
+    result.st_ino = s64.st_ino.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+
+    Ok(result)
+}
+
+#[cfg(linux_kernel)]
+#[allow(non_upper_case_globals)]
+mod sys {
+    use super::{c, BorrowedFd, Statx};
+
+    weak_or_syscall! {
+        pub(super) fn statx(
+            dirfd_: BorrowedFd<'_>,
+            path: *const c::c_char,
+            flags: c::c_int,
+            mask: c::c_uint,
+            buf: *mut Statx
+        ) via SYS_statx -> c::c_int
+    }
+}
+
+#[cfg(linux_kernel)]
+#[allow(non_upper_case_globals)]
+pub(crate) fn statx(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    flags: AtFlags,
+    mask: StatxFlags,
+) -> io::Result<Statx> {
+    // If a future Linux kernel adds more fields to `struct statx` and users
+    // passing flags unknown to rustix in `StatxFlags`, we could end up
+    // writing outside of the buffer. To prevent this possibility, we mask off
+    // any flags that we don't know about.
+    //
+    // This includes `STATX__RESERVED`, which has a value that we know, but
+    // which could take on arbitrary new meaning in the future. Linux currently
+    // rejects this flag with `EINVAL`, so we do the same.
+    //
+    // This doesn't rely on `STATX_ALL` because [it's deprecated] and already
+    // doesn't represent all the known flags.
+    //
+    // [it's deprecated]: https://patchwork.kernel.org/project/linux-fsdevel/patch/20200505095915.11275-7-mszeredi@redhat.com/
+    #[cfg(not(any(target_os = "android", target_env = "musl")))]
+    const STATX__RESERVED: u32 = c::STATX__RESERVED as u32;
+    #[cfg(any(target_os = "android", target_env = "musl"))]
+    const STATX__RESERVED: u32 = linux_raw_sys::general::STATX__RESERVED;
+    if (mask.bits() & STATX__RESERVED) == STATX__RESERVED {
+        return Err(io::Errno::INVAL);
+    }
+    let mask = mask & StatxFlags::all();
+
+    let mut statx_buf = MaybeUninit::<Statx>::uninit();
+    unsafe {
+        ret(sys::statx(
+            dirfd,
+            c_str(path),
+            bitflags_bits!(flags),
+            mask.bits(),
+            statx_buf.as_mut_ptr(),
+        ))?;
+        Ok(statx_buf.assume_init())
+    }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn is_statx_available() -> bool {
+    unsafe {
+        // Call `statx` with null pointers so that if it fails for any reason
+        // other than `EFAULT`, we know it's not supported.
+        matches!(
+            ret(sys::statx(CWD, null(), 0, 0, null_mut())),
+            Err(io::Errno::FAULT)
+        )
+    }
+}
+
+#[cfg(apple)]
+pub(crate) unsafe fn fcopyfile(
+    from: BorrowedFd<'_>,
+    to: BorrowedFd<'_>,
+    state: copyfile_state_t,
+    flags: CopyfileFlags,
+) -> io::Result<()> {
+    extern "C" {
+        fn fcopyfile(
+            from: c::c_int,
+            to: c::c_int,
+            state: copyfile_state_t,
+            flags: c::c_uint,
+        ) -> c::c_int;
+    }
+
+    nonnegative_ret(fcopyfile(
+        borrowed_fd(from),
+        borrowed_fd(to),
+        state,
+        bitflags_bits!(flags),
+    ))
+}
+
+#[cfg(apple)]
+pub(crate) fn copyfile_state_alloc() -> io::Result<copyfile_state_t> {
+    extern "C" {
+        fn copyfile_state_alloc() -> copyfile_state_t;
+    }
+
+    let result = unsafe { copyfile_state_alloc() };
+    if result.0.is_null() {
+        Err(io::Errno::last_os_error())
+    } else {
+        Ok(result)
+    }
+}
+
+#[cfg(apple)]
+pub(crate) unsafe fn copyfile_state_free(state: copyfile_state_t) -> io::Result<()> {
+    extern "C" {
+        fn copyfile_state_free(state: copyfile_state_t) -> c::c_int;
+    }
+
+    nonnegative_ret(copyfile_state_free(state))
+}
+
+#[cfg(apple)]
+const COPYFILE_STATE_COPIED: u32 = 8;
+
+#[cfg(apple)]
+pub(crate) unsafe fn copyfile_state_get_copied(state: copyfile_state_t) -> io::Result<u64> {
+    let mut copied = MaybeUninit::<u64>::uninit();
+    copyfile_state_get(state, COPYFILE_STATE_COPIED, copied.as_mut_ptr().cast())?;
+    Ok(copied.assume_init())
+}
+
+#[cfg(apple)]
+pub(crate) unsafe fn copyfile_state_get(
+    state: copyfile_state_t,
+    flag: u32,
+    dst: *mut c::c_void,
+) -> io::Result<()> {
+    extern "C" {
+        fn copyfile_state_get(state: copyfile_state_t, flag: u32, dst: *mut c::c_void) -> c::c_int;
+    }
+
+    nonnegative_ret(copyfile_state_get(state, flag, dst))
+}
+
+#[cfg(all(apple, feature = "alloc"))]
+pub(crate) fn getpath(fd: BorrowedFd<'_>) -> io::Result<CString> {
+    // The use of `PATH_MAX` is generally not encouraged, but it
+    // is inevitable in this case because macOS defines `fcntl` with
+    // `F_GETPATH` in terms of `MAXPATHLEN`, and there are no
+    // alternatives. If a better method is invented, it should be used
+    // instead.
+    let mut buf = vec![0; c::PATH_MAX as usize];
+
+    // From the [macOS `fcntl` manual page]:
+    // `F_GETPATH` - Get the path of the file descriptor `Fildes`. The argument
+    //               must be a buffer of size `MAXPATHLEN` or greater.
+    //
+    // [macOS `fcntl` manual page]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
+    unsafe {
+        ret(c::fcntl(borrowed_fd(fd), c::F_GETPATH, buf.as_mut_ptr()))?;
+    }
+
+    let l = buf.iter().position(|&c| c == 0).unwrap();
+    buf.truncate(l);
+    buf.shrink_to_fit();
+
+    Ok(CString::new(buf).unwrap())
+}
+
+#[cfg(apple)]
+pub(crate) fn fcntl_rdadvise(fd: BorrowedFd<'_>, offset: u64, len: u64) -> io::Result<()> {
+    // From the [macOS `fcntl` manual page]:
+    // `F_RDADVISE` - Issue an advisory read async with no copy to user.
+    //
+    // The `F_RDADVISE` command operates on the following structure which holds
+    // information passed from the user to the system:
+    //
+    // ```c
+    // struct radvisory {
+    //      off_t   ra_offset;  /* offset into the file */
+    //      int     ra_count;   /* size of the read     */
+    // };
+    // ```
+    //
+    // [macOS `fcntl` manual page]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
+    let ra_offset = match offset.try_into() {
+        Ok(len) => len,
+        // If this conversion fails, the user is providing an offset outside
+        // any possible file extent, so just ignore it.
+        Err(_) => return Ok(()),
+    };
+    let ra_count = match len.try_into() {
+        Ok(len) => len,
+        // If this conversion fails, the user is providing a dubiously large
+        // hint which is unlikely to improve performance.
+        Err(_) => return Ok(()),
+    };
+    unsafe {
+        let radvisory = c::radvisory {
+            ra_offset,
+            ra_count,
+        };
+        ret(c::fcntl(borrowed_fd(fd), c::F_RDADVISE, &radvisory))
+    }
+}
+
+#[cfg(apple)]
+pub(crate) fn fcntl_fullfsync(fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe { ret(c::fcntl(borrowed_fd(fd), c::F_FULLFSYNC)) }
+}
+
+#[cfg(apple)]
+pub(crate) fn fcntl_nocache(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    unsafe { ret(c::fcntl(borrowed_fd(fd), c::F_NOCACHE, value as c::c_int)) }
+}
+
+#[cfg(apple)]
+pub(crate) fn fcntl_global_nocache(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    unsafe {
+        ret(c::fcntl(
+            borrowed_fd(fd),
+            c::F_GLOBAL_NOCACHE,
+            value as c::c_int,
+        ))
+    }
+}
+
+/// Convert `times` from a `futimens`/`utimensat` argument into `setattrlist`
+/// arguments.
+#[cfg(apple)]
+fn times_to_attrlist(times: &Timestamps) -> (c::size_t, [c::timespec; 2], Attrlist) {
+    // ABI details.
+    const ATTR_CMN_MODTIME: u32 = 0x0000_0400;
+    const ATTR_CMN_ACCTIME: u32 = 0x0000_1000;
+    const ATTR_BIT_MAP_COUNT: u16 = 5;
+
+    let mut times = times.clone();
+
+    // If we have any `UTIME_NOW` elements, replace them with the current time.
+    if times.last_access.tv_nsec == c::UTIME_NOW || times.last_modification.tv_nsec == c::UTIME_NOW
+    {
+        let now = {
+            let mut tv = c::timeval {
+                tv_sec: 0,
+                tv_usec: 0,
+            };
+            unsafe {
+                let r = c::gettimeofday(&mut tv, null_mut());
+                assert_eq!(r, 0);
+            }
+            c::timespec {
+                tv_sec: tv.tv_sec,
+                tv_nsec: (tv.tv_usec * 1000) as _,
+            }
+        };
+        if times.last_access.tv_nsec == c::UTIME_NOW {
+            times.last_access = now;
+        }
+        if times.last_modification.tv_nsec == c::UTIME_NOW {
+            times.last_modification = now;
+        }
+    }
+
+    // Pack the return values following the rules for [`getattrlist`].
+    //
+    // [`getattrlist`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getattrlist.2.html
+    let mut times_size = 0;
+    let mut attrs = Attrlist {
+        bitmapcount: ATTR_BIT_MAP_COUNT,
+        reserved: 0,
+        commonattr: 0,
+        volattr: 0,
+        dirattr: 0,
+        fileattr: 0,
+        forkattr: 0,
+    };
+    let mut return_times = [c::timespec {
+        tv_sec: 0,
+        tv_nsec: 0,
+    }; 2];
+    let mut times_index = 0;
+    if times.last_modification.tv_nsec != c::UTIME_OMIT {
+        attrs.commonattr |= ATTR_CMN_MODTIME;
+        return_times[times_index] = times.last_modification;
+        times_index += 1;
+        times_size += size_of::<c::timespec>();
+    }
+    if times.last_access.tv_nsec != c::UTIME_OMIT {
+        attrs.commonattr |= ATTR_CMN_ACCTIME;
+        return_times[times_index] = times.last_access;
+        times_size += size_of::<c::timespec>();
+    }
+
+    (times_size, return_times, attrs)
+}
+
+/// Support type for `Attrlist`.
+#[cfg(apple)]
+type Attrgroup = u32;
+
+/// Attribute list for use with `setattrlist`.
+#[cfg(apple)]
+#[repr(C)]
+struct Attrlist {
+    bitmapcount: u16,
+    reserved: u16,
+    commonattr: Attrgroup,
+    volattr: Attrgroup,
+    dirattr: Attrgroup,
+    fileattr: Attrgroup,
+    forkattr: Attrgroup,
+}
+
+#[cfg(any(apple, linux_kernel))]
+pub(crate) fn getxattr(path: &CStr, name: &CStr, value: &mut [u8]) -> io::Result<usize> {
+    let value_ptr = value.as_mut_ptr();
+
+    #[cfg(not(apple))]
+    unsafe {
+        ret_usize(c::getxattr(
+            path.as_ptr(),
+            name.as_ptr(),
+            value_ptr.cast::<c::c_void>(),
+            value.len(),
+        ))
+    }
+
+    #[cfg(apple)]
+    unsafe {
+        ret_usize(c::getxattr(
+            path.as_ptr(),
+            name.as_ptr(),
+            value_ptr.cast::<c::c_void>(),
+            value.len(),
+            0,
+            0,
+        ))
+    }
+}
+
+#[cfg(any(apple, linux_kernel))]
+pub(crate) fn lgetxattr(path: &CStr, name: &CStr, value: &mut [u8]) -> io::Result<usize> {
+    let value_ptr = value.as_mut_ptr();
+
+    #[cfg(not(apple))]
+    unsafe {
+        ret_usize(c::lgetxattr(
+            path.as_ptr(),
+            name.as_ptr(),
+            value_ptr.cast::<c::c_void>(),
+            value.len(),
+        ))
+    }
+
+    #[cfg(apple)]
+    unsafe {
+        ret_usize(c::getxattr(
+            path.as_ptr(),
+            name.as_ptr(),
+            value_ptr.cast::<c::c_void>(),
+            value.len(),
+            0,
+            c::XATTR_NOFOLLOW,
+        ))
+    }
+}
+
+#[cfg(any(apple, linux_kernel))]
+pub(crate) fn fgetxattr(fd: BorrowedFd<'_>, name: &CStr, value: &mut [u8]) -> io::Result<usize> {
+    let value_ptr = value.as_mut_ptr();
+
+    #[cfg(not(apple))]
+    unsafe {
+        ret_usize(c::fgetxattr(
+            borrowed_fd(fd),
+            name.as_ptr(),
+            value_ptr.cast::<c::c_void>(),
+            value.len(),
+        ))
+    }
+
+    #[cfg(apple)]
+    unsafe {
+        ret_usize(c::fgetxattr(
+            borrowed_fd(fd),
+            name.as_ptr(),
+            value_ptr.cast::<c::c_void>(),
+            value.len(),
+            0,
+            0,
+        ))
+    }
+}
+
+#[cfg(any(apple, linux_kernel))]
+pub(crate) fn setxattr(
+    path: &CStr,
+    name: &CStr,
+    value: &[u8],
+    flags: XattrFlags,
+) -> io::Result<()> {
+    #[cfg(not(apple))]
+    unsafe {
+        ret(c::setxattr(
+            path.as_ptr(),
+            name.as_ptr(),
+            value.as_ptr().cast::<c::c_void>(),
+            value.len(),
+            flags.bits() as i32,
+        ))
+    }
+
+    #[cfg(apple)]
+    unsafe {
+        ret(c::setxattr(
+            path.as_ptr(),
+            name.as_ptr(),
+            value.as_ptr().cast::<c::c_void>(),
+            value.len(),
+            0,
+            flags.bits() as i32,
+        ))
+    }
+}
+
+#[cfg(any(apple, linux_kernel))]
+pub(crate) fn lsetxattr(
+    path: &CStr,
+    name: &CStr,
+    value: &[u8],
+    flags: XattrFlags,
+) -> io::Result<()> {
+    #[cfg(not(apple))]
+    unsafe {
+        ret(c::lsetxattr(
+            path.as_ptr(),
+            name.as_ptr(),
+            value.as_ptr().cast::<c::c_void>(),
+            value.len(),
+            flags.bits() as i32,
+        ))
+    }
+
+    #[cfg(apple)]
+    unsafe {
+        ret(c::setxattr(
+            path.as_ptr(),
+            name.as_ptr(),
+            value.as_ptr().cast::<c::c_void>(),
+            value.len(),
+            0,
+            flags.bits() as i32 | c::XATTR_NOFOLLOW,
+        ))
+    }
+}
+
+#[cfg(any(apple, linux_kernel))]
+pub(crate) fn fsetxattr(
+    fd: BorrowedFd<'_>,
+    name: &CStr,
+    value: &[u8],
+    flags: XattrFlags,
+) -> io::Result<()> {
+    #[cfg(not(apple))]
+    unsafe {
+        ret(c::fsetxattr(
+            borrowed_fd(fd),
+            name.as_ptr(),
+            value.as_ptr().cast::<c::c_void>(),
+            value.len(),
+            flags.bits() as i32,
+        ))
+    }
+
+    #[cfg(apple)]
+    unsafe {
+        ret(c::fsetxattr(
+            borrowed_fd(fd),
+            name.as_ptr(),
+            value.as_ptr().cast::<c::c_void>(),
+            value.len(),
+            0,
+            flags.bits() as i32,
+        ))
+    }
+}
+
+#[cfg(any(apple, linux_kernel))]
+pub(crate) fn listxattr(path: &CStr, list: &mut [c::c_char]) -> io::Result<usize> {
+    #[cfg(not(apple))]
+    unsafe {
+        ret_usize(c::listxattr(path.as_ptr(), list.as_mut_ptr(), list.len()))
+    }
+
+    #[cfg(apple)]
+    unsafe {
+        ret_usize(c::listxattr(
+            path.as_ptr(),
+            list.as_mut_ptr(),
+            list.len(),
+            0,
+        ))
+    }
+}
+
+#[cfg(any(apple, linux_kernel))]
+pub(crate) fn llistxattr(path: &CStr, list: &mut [c::c_char]) -> io::Result<usize> {
+    #[cfg(not(apple))]
+    unsafe {
+        ret_usize(c::llistxattr(path.as_ptr(), list.as_mut_ptr(), list.len()))
+    }
+
+    #[cfg(apple)]
+    unsafe {
+        ret_usize(c::listxattr(
+            path.as_ptr(),
+            list.as_mut_ptr(),
+            list.len(),
+            c::XATTR_NOFOLLOW,
+        ))
+    }
+}
+
+#[cfg(any(apple, linux_kernel))]
+pub(crate) fn flistxattr(fd: BorrowedFd<'_>, list: &mut [c::c_char]) -> io::Result<usize> {
+    let fd = borrowed_fd(fd);
+
+    #[cfg(not(apple))]
+    unsafe {
+        ret_usize(c::flistxattr(fd, list.as_mut_ptr(), list.len()))
+    }
+
+    #[cfg(apple)]
+    unsafe {
+        ret_usize(c::flistxattr(fd, list.as_mut_ptr(), list.len(), 0))
+    }
+}
+
+#[cfg(any(apple, linux_kernel))]
+pub(crate) fn removexattr(path: &CStr, name: &CStr) -> io::Result<()> {
+    #[cfg(not(apple))]
+    unsafe {
+        ret(c::removexattr(path.as_ptr(), name.as_ptr()))
+    }
+
+    #[cfg(apple)]
+    unsafe {
+        ret(c::removexattr(path.as_ptr(), name.as_ptr(), 0))
+    }
+}
+
+#[cfg(any(apple, linux_kernel))]
+pub(crate) fn lremovexattr(path: &CStr, name: &CStr) -> io::Result<()> {
+    #[cfg(not(apple))]
+    unsafe {
+        ret(c::lremovexattr(path.as_ptr(), name.as_ptr()))
+    }
+
+    #[cfg(apple)]
+    unsafe {
+        ret(c::removexattr(
+            path.as_ptr(),
+            name.as_ptr(),
+            c::XATTR_NOFOLLOW,
+        ))
+    }
+}
+
+#[cfg(any(apple, linux_kernel))]
+pub(crate) fn fremovexattr(fd: BorrowedFd<'_>, name: &CStr) -> io::Result<()> {
+    let fd = borrowed_fd(fd);
+
+    #[cfg(not(apple))]
+    unsafe {
+        ret(c::fremovexattr(fd, name.as_ptr()))
+    }
+
+    #[cfg(apple)]
+    unsafe {
+        ret(c::fremovexattr(fd, name.as_ptr(), 0))
+    }
+}
+
+#[test]
+fn test_sizes() {
+    #[cfg(linux_kernel)]
+    assert_eq_size!(c::loff_t, u64);
+
+    // Assert that `Timestamps` has the expected layout. If we're not fixing
+    // y2038, libc's type should match ours. If we are, it's smaller.
+    #[cfg(not(fix_y2038))]
+    assert_eq_size!([c::timespec; 2], Timestamps);
+    #[cfg(fix_y2038)]
+    assert!(core::mem::size_of::<[c::timespec; 2]>() < core::mem::size_of::<Timestamps>());
+}
diff --git a/vendor/rustix/src/backend/libc/fs/types.rs b/vendor/rustix/src/backend/libc/fs/types.rs
new file mode 100644
index 0000000..19508c2
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/fs/types.rs
@@ -0,0 +1,1164 @@
+use crate::backend::c;
+use bitflags::bitflags;
+
+#[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+bitflags! {
+    /// `*_OK` constants for use with [`accessat`].
+    ///
+    /// [`accessat`]: fn.accessat.html
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct Access: c::c_int {
+        /// `R_OK`
+        const READ_OK = c::R_OK;
+
+        /// `W_OK`
+        const WRITE_OK = c::W_OK;
+
+        /// `X_OK`
+        const EXEC_OK = c::X_OK;
+
+        /// `F_OK`
+        const EXISTS = c::F_OK;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "redox")))]
+bitflags! {
+    /// `AT_*` constants for use with [`openat`], [`statat`], and other `*at`
+    /// functions.
+    ///
+    /// [`openat`]: crate::fs::openat
+    /// [`statat`]: crate::fs::statat
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct AtFlags: u32 {
+        /// `AT_SYMLINK_NOFOLLOW`
+        const SYMLINK_NOFOLLOW = bitcast!(c::AT_SYMLINK_NOFOLLOW);
+
+        /// `AT_EACCESS`
+        #[cfg(not(any(target_os = "emscripten", target_os = "android")))]
+        const EACCESS = bitcast!(c::AT_EACCESS);
+
+        /// `AT_REMOVEDIR`
+        const REMOVEDIR = bitcast!(c::AT_REMOVEDIR);
+
+        /// `AT_SYMLINK_FOLLOW`
+        const SYMLINK_FOLLOW = bitcast!(c::AT_SYMLINK_FOLLOW);
+
+        /// `AT_NO_AUTOMOUNT`
+        #[cfg(any(linux_like, target_os = "fuchsia"))]
+        const NO_AUTOMOUNT = bitcast!(c::AT_NO_AUTOMOUNT);
+
+        /// `AT_EMPTY_PATH`
+        #[cfg(any(
+            linux_kernel,
+            target_os = "freebsd",
+            target_os = "fuchsia",
+        ))]
+        const EMPTY_PATH = bitcast!(c::AT_EMPTY_PATH);
+
+        /// `AT_RESOLVE_BENEATH`
+        #[cfg(target_os = "freebsd")]
+        const RESOLVE_BENEATH = bitcast!(c::AT_RESOLVE_BENEATH);
+
+        /// `AT_STATX_SYNC_AS_STAT`
+        #[cfg(all(target_os = "linux", target_env = "gnu"))]
+        const STATX_SYNC_AS_STAT = bitcast!(c::AT_STATX_SYNC_AS_STAT);
+
+        /// `AT_STATX_FORCE_SYNC`
+        #[cfg(all(target_os = "linux", target_env = "gnu"))]
+        const STATX_FORCE_SYNC = bitcast!(c::AT_STATX_FORCE_SYNC);
+
+        /// `AT_STATX_DONT_SYNC`
+        #[cfg(all(target_os = "linux", target_env = "gnu"))]
+        const STATX_DONT_SYNC = bitcast!(c::AT_STATX_DONT_SYNC);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `S_I*` constants for use with [`openat`], [`chmodat`], and [`fchmod`].
+    ///
+    /// [`openat`]: crate::fs::openat
+    /// [`chmodat`]: crate::fs::chmodat
+    /// [`fchmod`]: crate::fs::fchmod
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct Mode: RawMode {
+        /// `S_IRWXU`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const RWXU = c::S_IRWXU as RawMode;
+
+        /// `S_IRUSR`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const RUSR = c::S_IRUSR as RawMode;
+
+        /// `S_IWUSR`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const WUSR = c::S_IWUSR as RawMode;
+
+        /// `S_IXUSR`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const XUSR = c::S_IXUSR as RawMode;
+
+        /// `S_IRWXG`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const RWXG = c::S_IRWXG as RawMode;
+
+        /// `S_IRGRP`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const RGRP = c::S_IRGRP as RawMode;
+
+        /// `S_IWGRP`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const WGRP = c::S_IWGRP as RawMode;
+
+        /// `S_IXGRP`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const XGRP = c::S_IXGRP as RawMode;
+
+        /// `S_IRWXO`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const RWXO = c::S_IRWXO as RawMode;
+
+        /// `S_IROTH`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const ROTH = c::S_IROTH as RawMode;
+
+        /// `S_IWOTH`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const WOTH = c::S_IWOTH as RawMode;
+
+        /// `S_IXOTH`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const XOTH = c::S_IXOTH as RawMode;
+
+        /// `S_ISUID`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const SUID = c::S_ISUID as RawMode;
+
+        /// `S_ISGID`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const SGID = c::S_ISGID as RawMode;
+
+        /// `S_ISVTX`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const SVTX = c::S_ISVTX as RawMode;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(not(target_os = "espidf"))]
+impl Mode {
+    /// Construct a `Mode` from the mode bits of the `st_mode` field of a
+    /// `Mode`.
+    #[inline]
+    pub const fn from_raw_mode(st_mode: RawMode) -> Self {
+        Self::from_bits_truncate(st_mode)
+    }
+
+    /// Construct an `st_mode` value from a `Mode`.
+    #[inline]
+    pub const fn as_raw_mode(self) -> RawMode {
+        self.bits()
+    }
+}
+
+#[cfg(not(target_os = "espidf"))]
+impl From<RawMode> for Mode {
+    /// Support conversions from raw mode values to `Mode`.
+    ///
+    /// ```
+    /// use rustix::fs::{Mode, RawMode};
+    /// assert_eq!(Mode::from(0o700), Mode::RWXU);
+    /// ```
+    #[inline]
+    fn from(st_mode: RawMode) -> Self {
+        Self::from_raw_mode(st_mode)
+    }
+}
+
+#[cfg(not(target_os = "espidf"))]
+impl From<Mode> for RawMode {
+    /// Support conversions from `Mode` to raw mode values.
+    ///
+    /// ```
+    /// use rustix::fs::{Mode, RawMode};
+    /// assert_eq!(RawMode::from(Mode::RWXU), 0o700);
+    /// ```
+    #[inline]
+    fn from(mode: Mode) -> Self {
+        mode.as_raw_mode()
+    }
+}
+
+bitflags! {
+    /// `O_*` constants for use with [`openat`].
+    ///
+    /// [`openat`]: crate::fs::openat
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct OFlags: u32 {
+        /// `O_ACCMODE`
+        const ACCMODE = bitcast!(c::O_ACCMODE);
+
+        /// Similar to `ACCMODE`, but just includes the read/write flags, and
+        /// no other flags.
+        ///
+        /// On some platforms, `PATH` may be included in `ACCMODE`, when
+        /// sometimes we really just want the read/write bits. Caution is
+        /// indicated, as the presence of `PATH` may mean that the read/write
+        /// bits don't have their usual meaning.
+        const RWMODE = bitcast!(c::O_RDONLY | c::O_WRONLY | c::O_RDWR);
+
+        /// `O_APPEND`
+        const APPEND = bitcast!(c::O_APPEND);
+
+        /// `O_CREAT`
+        #[doc(alias = "CREAT")]
+        const CREATE = bitcast!(c::O_CREAT);
+
+        /// `O_DIRECTORY`
+        #[cfg(not(target_os = "espidf"))]
+        const DIRECTORY = bitcast!(c::O_DIRECTORY);
+
+        /// `O_DSYNC`
+        #[cfg(not(any(target_os = "dragonfly", target_os = "espidf", target_os = "l4re", target_os = "redox", target_os = "vita")))]
+        const DSYNC = bitcast!(c::O_DSYNC);
+
+        /// `O_EXCL`
+        const EXCL = bitcast!(c::O_EXCL);
+
+        /// `O_FSYNC`
+        #[cfg(any(
+            bsd,
+            all(target_os = "linux", not(target_env = "musl")),
+        ))]
+        const FSYNC = bitcast!(c::O_FSYNC);
+
+        /// `O_NOFOLLOW`
+        #[cfg(not(target_os = "espidf"))]
+        const NOFOLLOW = bitcast!(c::O_NOFOLLOW);
+
+        /// `O_NONBLOCK`
+        const NONBLOCK = bitcast!(c::O_NONBLOCK);
+
+        /// `O_RDONLY`
+        const RDONLY = bitcast!(c::O_RDONLY);
+
+        /// `O_WRONLY`
+        const WRONLY = bitcast!(c::O_WRONLY);
+
+        /// `O_RDWR`
+        ///
+        /// This is not equal to `RDONLY | WRONLY`. It's a distinct flag.
+        const RDWR = bitcast!(c::O_RDWR);
+
+        /// `O_NOCTTY`
+        #[cfg(not(any(target_os = "espidf", target_os = "l4re", target_os = "redox", target_os = "vita")))]
+        const NOCTTY = bitcast!(c::O_NOCTTY);
+
+        /// `O_RSYNC`
+        #[cfg(any(
+            linux_kernel,
+            netbsdlike,
+            target_os = "emscripten",
+            target_os = "wasi",
+        ))]
+        const RSYNC = bitcast!(c::O_RSYNC);
+
+        /// `O_SYNC`
+        #[cfg(not(any(target_os = "l4re", target_os = "redox")))]
+        const SYNC = bitcast!(c::O_SYNC);
+
+        /// `O_TRUNC`
+        const TRUNC = bitcast!(c::O_TRUNC);
+
+        /// `O_PATH`
+        #[cfg(any(
+            linux_kernel,
+            target_os = "emscripten",
+            target_os = "freebsd",
+            target_os = "fuchsia",
+            target_os = "redox",
+        ))]
+        const PATH = bitcast!(c::O_PATH);
+
+        /// `O_CLOEXEC`
+        const CLOEXEC = bitcast!(c::O_CLOEXEC);
+
+        /// `O_TMPFILE`
+        #[cfg(any(
+            linux_kernel,
+            target_os = "emscripten",
+            target_os = "fuchsia",
+        ))]
+        const TMPFILE = bitcast!(c::O_TMPFILE);
+
+        /// `O_NOATIME`
+        #[cfg(any(
+            linux_kernel,
+            target_os = "fuchsia",
+        ))]
+        const NOATIME = bitcast!(c::O_NOATIME);
+
+        /// `O_DIRECT`
+        #[cfg(any(
+            linux_kernel,
+            target_os = "emscripten",
+            target_os = "freebsd",
+            target_os = "fuchsia",
+            target_os = "netbsd",
+        ))]
+        const DIRECT = bitcast!(c::O_DIRECT);
+
+        /// `O_RESOLVE_BENEATH`
+        #[cfg(target_os = "freebsd")]
+        const RESOLVE_BENEATH = bitcast!(c::O_RESOLVE_BENEATH);
+
+        /// `O_EMPTY_PATH`
+        #[cfg(target_os = "freebsd")]
+        const EMPTY_PATH = bitcast!(c::O_EMPTY_PATH);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(apple)]
+bitflags! {
+    /// `CLONE_*` constants for use with [`fclonefileat`].
+    ///
+    /// [`fclonefileat`]: crate::fs::fclonefileat
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct CloneFlags: u32 {
+        /// `CLONE_NOFOLLOW`
+        const NOFOLLOW = 1;
+
+        /// `CLONE_NOOWNERCOPY`
+        const NOOWNERCOPY = 2;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(apple)]
+mod copyfile {
+    pub(super) const ACL: u32 = 1 << 0;
+    pub(super) const STAT: u32 = 1 << 1;
+    pub(super) const XATTR: u32 = 1 << 2;
+    pub(super) const DATA: u32 = 1 << 3;
+    pub(super) const SECURITY: u32 = STAT | ACL;
+    pub(super) const METADATA: u32 = SECURITY | XATTR;
+    pub(super) const ALL: u32 = METADATA | DATA;
+}
+
+#[cfg(apple)]
+bitflags! {
+    /// `COPYFILE_*` constants for use with [`fcopyfile`].
+    ///
+    /// [`fcopyfile`]: crate::fs::fcopyfile
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct CopyfileFlags: c::c_uint {
+        /// `COPYFILE_ACL`
+        const ACL = copyfile::ACL;
+
+        /// `COPYFILE_STAT`
+        const STAT = copyfile::STAT;
+
+        /// `COPYFILE_XATTR`
+        const XATTR = copyfile::XATTR;
+
+        /// `COPYFILE_DATA`
+        const DATA = copyfile::DATA;
+
+        /// `COPYFILE_SECURITY`
+        const SECURITY = copyfile::SECURITY;
+
+        /// `COPYFILE_METADATA`
+        const METADATA = copyfile::METADATA;
+
+        /// `COPYFILE_ALL`
+        const ALL = copyfile::ALL;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `RESOLVE_*` constants for use with [`openat2`].
+    ///
+    /// [`openat2`]: crate::fs::openat2
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct ResolveFlags: u64 {
+        /// `RESOLVE_NO_XDEV`
+        const NO_XDEV = 0x01;
+
+        /// `RESOLVE_NO_MAGICLINKS`
+        const NO_MAGICLINKS = 0x02;
+
+        /// `RESOLVE_NO_SYMLINKS`
+        const NO_SYMLINKS = 0x04;
+
+        /// `RESOLVE_BENEATH`
+        const BENEATH = 0x08;
+
+        /// `RESOLVE_IN_ROOT`
+        const IN_ROOT = 0x10;
+
+        /// `RESOLVE_CACHED` (since Linux 5.12)
+        const CACHED = 0x20;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `RENAME_*` constants for use with [`renameat_with`].
+    ///
+    /// [`renameat_with`]: crate::fs::renameat_with
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct RenameFlags: c::c_uint {
+        /// `RENAME_EXCHANGE`
+        const EXCHANGE = bitcast!(c::RENAME_EXCHANGE);
+
+        /// `RENAME_NOREPLACE`
+        const NOREPLACE = bitcast!(c::RENAME_NOREPLACE);
+
+        /// `RENAME_WHITEOUT`
+        const WHITEOUT = bitcast!(c::RENAME_WHITEOUT);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `S_IF*` constants for use with [`mknodat`] and [`Stat`]'s `st_mode` field.
+///
+/// [`mknodat`]: crate::fs::mknodat
+/// [`Stat`]: crate::fs::Stat
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum FileType {
+    /// `S_IFREG`
+    RegularFile = c::S_IFREG as isize,
+
+    /// `S_IFDIR`
+    Directory = c::S_IFDIR as isize,
+
+    /// `S_IFLNK`
+    Symlink = c::S_IFLNK as isize,
+
+    /// `S_IFIFO`
+    #[cfg(not(target_os = "wasi"))] // TODO: Use WASI's `S_IFIFO`.
+    #[doc(alias = "IFO")]
+    Fifo = c::S_IFIFO as isize,
+
+    /// `S_IFSOCK`
+    #[cfg(not(target_os = "wasi"))] // TODO: Use WASI's `S_IFSOCK`.
+    Socket = c::S_IFSOCK as isize,
+
+    /// `S_IFCHR`
+    CharacterDevice = c::S_IFCHR as isize,
+
+    /// `S_IFBLK`
+    BlockDevice = c::S_IFBLK as isize,
+
+    /// An unknown filesystem object.
+    Unknown,
+}
+
+impl FileType {
+    /// Construct a `FileType` from the `S_IFMT` bits of the `st_mode` field of
+    /// a `Stat`.
+    #[inline]
+    pub const fn from_raw_mode(st_mode: RawMode) -> Self {
+        match (st_mode as c::mode_t) & c::S_IFMT {
+            c::S_IFREG => Self::RegularFile,
+            c::S_IFDIR => Self::Directory,
+            c::S_IFLNK => Self::Symlink,
+            #[cfg(not(target_os = "wasi"))] // TODO: Use WASI's `S_IFIFO`.
+            c::S_IFIFO => Self::Fifo,
+            #[cfg(not(target_os = "wasi"))] // TODO: Use WASI's `S_IFSOCK`.
+            c::S_IFSOCK => Self::Socket,
+            c::S_IFCHR => Self::CharacterDevice,
+            c::S_IFBLK => Self::BlockDevice,
+            _ => Self::Unknown,
+        }
+    }
+
+    /// Construct an `st_mode` value from a `FileType`.
+    #[inline]
+    pub const fn as_raw_mode(self) -> RawMode {
+        match self {
+            Self::RegularFile => c::S_IFREG as RawMode,
+            Self::Directory => c::S_IFDIR as RawMode,
+            Self::Symlink => c::S_IFLNK as RawMode,
+            #[cfg(not(target_os = "wasi"))] // TODO: Use WASI's `S_IFIFO`.
+            Self::Fifo => c::S_IFIFO as RawMode,
+            #[cfg(not(target_os = "wasi"))] // TODO: Use WASI's `S_IFSOCK`.
+            Self::Socket => c::S_IFSOCK as RawMode,
+            Self::CharacterDevice => c::S_IFCHR as RawMode,
+            Self::BlockDevice => c::S_IFBLK as RawMode,
+            Self::Unknown => c::S_IFMT as RawMode,
+        }
+    }
+
+    /// Construct a `FileType` from the `d_type` field of a `c::dirent`.
+    #[cfg(not(any(
+        solarish,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "redox",
+        target_os = "vita"
+    )))]
+    #[inline]
+    pub(crate) const fn from_dirent_d_type(d_type: u8) -> Self {
+        match d_type {
+            c::DT_REG => Self::RegularFile,
+            c::DT_DIR => Self::Directory,
+            c::DT_LNK => Self::Symlink,
+            #[cfg(not(target_os = "wasi"))] // TODO: Use WASI's `DT_SOCK`.
+            c::DT_SOCK => Self::Socket,
+            #[cfg(not(target_os = "wasi"))] // TODO: Use WASI's `DT_FIFO`.
+            c::DT_FIFO => Self::Fifo,
+            c::DT_CHR => Self::CharacterDevice,
+            c::DT_BLK => Self::BlockDevice,
+            // c::DT_UNKNOWN |
+            _ => Self::Unknown,
+        }
+    }
+}
+
+/// `POSIX_FADV_*` constants for use with [`fadvise`].
+///
+/// [`fadvise`]: crate::fs::fadvise
+#[cfg(not(any(
+    apple,
+    netbsdlike,
+    solarish,
+    target_os = "dragonfly",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "redox",
+    target_os = "vita",
+)))]
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[repr(u32)]
+pub enum Advice {
+    /// `POSIX_FADV_NORMAL`
+    Normal = c::POSIX_FADV_NORMAL as c::c_uint,
+
+    /// `POSIX_FADV_SEQUENTIAL`
+    Sequential = c::POSIX_FADV_SEQUENTIAL as c::c_uint,
+
+    /// `POSIX_FADV_RANDOM`
+    Random = c::POSIX_FADV_RANDOM as c::c_uint,
+
+    /// `POSIX_FADV_NOREUSE`
+    NoReuse = c::POSIX_FADV_NOREUSE as c::c_uint,
+
+    /// `POSIX_FADV_WILLNEED`
+    WillNeed = c::POSIX_FADV_WILLNEED as c::c_uint,
+
+    /// `POSIX_FADV_DONTNEED`
+    DontNeed = c::POSIX_FADV_DONTNEED as c::c_uint,
+}
+
+#[cfg(any(linux_kernel, target_os = "freebsd"))]
+bitflags! {
+    /// `MFD_*` constants for use with [`memfd_create`].
+    ///
+    /// [`memfd_create`]: crate::fs::memfd_create
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MemfdFlags: c::c_uint {
+        /// `MFD_CLOEXEC`
+        const CLOEXEC = c::MFD_CLOEXEC;
+
+        /// `MFD_ALLOW_SEALING`
+        const ALLOW_SEALING = c::MFD_ALLOW_SEALING;
+
+        /// `MFD_HUGETLB` (since Linux 4.14)
+        const HUGETLB = c::MFD_HUGETLB;
+
+        /// `MFD_HUGE_64KB`
+        const HUGE_64KB = c::MFD_HUGE_64KB;
+        /// `MFD_HUGE_512JB`
+        const HUGE_512KB = c::MFD_HUGE_512KB;
+        /// `MFD_HUGE_1MB`
+        const HUGE_1MB = c::MFD_HUGE_1MB;
+        /// `MFD_HUGE_2MB`
+        const HUGE_2MB = c::MFD_HUGE_2MB;
+        /// `MFD_HUGE_8MB`
+        const HUGE_8MB = c::MFD_HUGE_8MB;
+        /// `MFD_HUGE_16MB`
+        const HUGE_16MB = c::MFD_HUGE_16MB;
+        /// `MFD_HUGE_32MB`
+        const HUGE_32MB = c::MFD_HUGE_32MB;
+        /// `MFD_HUGE_256MB`
+        const HUGE_256MB = c::MFD_HUGE_256MB;
+        /// `MFD_HUGE_512MB`
+        const HUGE_512MB = c::MFD_HUGE_512MB;
+        /// `MFD_HUGE_1GB`
+        const HUGE_1GB = c::MFD_HUGE_1GB;
+        /// `MFD_HUGE_2GB`
+        const HUGE_2GB = c::MFD_HUGE_2GB;
+        /// `MFD_HUGE_16GB`
+        const HUGE_16GB = c::MFD_HUGE_16GB;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
+bitflags! {
+    /// `F_SEAL_*` constants for use with [`fcntl_add_seals`] and
+    /// [`fcntl_get_seals`].
+    ///
+    /// [`fcntl_add_seals`]: crate::fs::fcntl_add_seals
+    /// [`fcntl_get_seals`]: crate::fs::fcntl_get_seals
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct SealFlags: u32 {
+        /// `F_SEAL_SEAL`
+        const SEAL = bitcast!(c::F_SEAL_SEAL);
+        /// `F_SEAL_SHRINK`
+        const SHRINK = bitcast!(c::F_SEAL_SHRINK);
+        /// `F_SEAL_GROW`
+        const GROW = bitcast!(c::F_SEAL_GROW);
+        /// `F_SEAL_WRITE`
+        const WRITE = bitcast!(c::F_SEAL_WRITE);
+        /// `F_SEAL_FUTURE_WRITE` (since Linux 5.1)
+        #[cfg(linux_kernel)]
+        const FUTURE_WRITE = bitcast!(c::F_SEAL_FUTURE_WRITE);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(all(target_os = "linux", target_env = "gnu"))]
+bitflags! {
+    /// `STATX_*` constants for use with [`statx`].
+    ///
+    /// [`statx`]: crate::fs::statx
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct StatxFlags: u32 {
+        /// `STATX_TYPE`
+        const TYPE = c::STATX_TYPE;
+
+        /// `STATX_MODE`
+        const MODE = c::STATX_MODE;
+
+        /// `STATX_NLINK`
+        const NLINK = c::STATX_NLINK;
+
+        /// `STATX_UID`
+        const UID = c::STATX_UID;
+
+        /// `STATX_GID`
+        const GID = c::STATX_GID;
+
+        /// `STATX_ATIME`
+        const ATIME = c::STATX_ATIME;
+
+        /// `STATX_MTIME`
+        const MTIME = c::STATX_MTIME;
+
+        /// `STATX_CTIME`
+        const CTIME = c::STATX_CTIME;
+
+        /// `STATX_INO`
+        const INO = c::STATX_INO;
+
+        /// `STATX_SIZE`
+        const SIZE = c::STATX_SIZE;
+
+        /// `STATX_BLOCKS`
+        const BLOCKS = c::STATX_BLOCKS;
+
+        /// `STATX_BASIC_STATS`
+        const BASIC_STATS = c::STATX_BASIC_STATS;
+
+        /// `STATX_BTIME`
+        const BTIME = c::STATX_BTIME;
+
+        /// `STATX_MNT_ID` (since Linux 5.8)
+        const MNT_ID = c::STATX_MNT_ID;
+
+        /// `STATX_DIOALIGN` (since Linux 6.1)
+        const DIOALIGN = c::STATX_DIOALIGN;
+
+        /// `STATX_ALL`
+        const ALL = c::STATX_ALL;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(any(
+    target_os = "android",
+    all(target_os = "linux", not(target_env = "gnu")),
+))]
+bitflags! {
+    /// `STATX_*` constants for use with [`statx`].
+    ///
+    /// [`statx`]: crate::fs::statx
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct StatxFlags: u32 {
+        /// `STATX_TYPE`
+        const TYPE = 0x0001;
+
+        /// `STATX_MODE`
+        const MODE = 0x0002;
+
+        /// `STATX_NLINK`
+        const NLINK = 0x0004;
+
+        /// `STATX_UID`
+        const UID = 0x0008;
+
+        /// `STATX_GID`
+        const GID = 0x0010;
+
+        /// `STATX_ATIME`
+        const ATIME = 0x0020;
+
+        /// `STATX_MTIME`
+        const MTIME = 0x0040;
+
+        /// `STATX_CTIME`
+        const CTIME = 0x0080;
+
+        /// `STATX_INO`
+        const INO = 0x0100;
+
+        /// `STATX_SIZE`
+        const SIZE = 0x0200;
+
+        /// `STATX_BLOCKS`
+        const BLOCKS = 0x0400;
+
+        /// `STATX_BASIC_STATS`
+        const BASIC_STATS = 0x07ff;
+
+        /// `STATX_BTIME`
+        const BTIME = 0x800;
+
+        /// `STATX_MNT_ID` (since Linux 5.8)
+        const MNT_ID = 0x1000;
+
+        /// `STATX_ALL`
+        const ALL = 0xfff;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(not(any(
+    netbsdlike,
+    solarish,
+    target_os = "aix",
+    target_os = "espidf",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita"
+)))]
+bitflags! {
+    /// `FALLOC_FL_*` constants for use with [`fallocate`].
+    ///
+    /// [`fallocate`]: crate::fs::fallocate
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct FallocateFlags: u32 {
+        /// `FALLOC_FL_KEEP_SIZE`
+        #[cfg(not(any(
+            bsd,
+            target_os = "aix",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "wasi",
+        )))]
+        const KEEP_SIZE = bitcast!(c::FALLOC_FL_KEEP_SIZE);
+        /// `FALLOC_FL_PUNCH_HOLE`
+        #[cfg(not(any(
+            bsd,
+            target_os = "aix",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "wasi",
+        )))]
+        const PUNCH_HOLE = bitcast!(c::FALLOC_FL_PUNCH_HOLE);
+        /// `FALLOC_FL_NO_HIDE_STALE`
+        #[cfg(not(any(
+            bsd,
+            target_os = "aix",
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "l4re",
+            target_os = "linux",
+            target_os = "wasi",
+        )))]
+        const NO_HIDE_STALE = bitcast!(c::FALLOC_FL_NO_HIDE_STALE);
+        /// `FALLOC_FL_COLLAPSE_RANGE`
+        #[cfg(not(any(
+            bsd,
+            target_os = "aix",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "emscripten",
+            target_os = "wasi",
+        )))]
+        const COLLAPSE_RANGE = bitcast!(c::FALLOC_FL_COLLAPSE_RANGE);
+        /// `FALLOC_FL_ZERO_RANGE`
+        #[cfg(not(any(
+            bsd,
+            target_os = "aix",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "emscripten",
+            target_os = "wasi",
+        )))]
+        const ZERO_RANGE = bitcast!(c::FALLOC_FL_ZERO_RANGE);
+        /// `FALLOC_FL_INSERT_RANGE`
+        #[cfg(not(any(
+            bsd,
+            target_os = "aix",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "emscripten",
+            target_os = "wasi",
+        )))]
+        const INSERT_RANGE = bitcast!(c::FALLOC_FL_INSERT_RANGE);
+        /// `FALLOC_FL_UNSHARE_RANGE`
+        #[cfg(not(any(
+            bsd,
+            target_os = "aix",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "emscripten",
+            target_os = "wasi",
+        )))]
+        const UNSHARE_RANGE = bitcast!(c::FALLOC_FL_UNSHARE_RANGE);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+bitflags! {
+    /// `ST_*` constants for use with [`StatVfs`].
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct StatVfsMountFlags: u64 {
+        /// `ST_MANDLOCK`
+        #[cfg(any(linux_kernel, target_os = "emscripten", target_os = "fuchsia"))]
+        const MANDLOCK = c::ST_MANDLOCK as u64;
+
+        /// `ST_NOATIME`
+        #[cfg(any(linux_kernel, target_os = "emscripten", target_os = "fuchsia"))]
+        const NOATIME = c::ST_NOATIME as u64;
+
+        /// `ST_NODEV`
+        #[cfg(any(
+            linux_kernel,
+            target_os = "aix",
+            target_os = "emscripten",
+            target_os = "fuchsia"
+        ))]
+        const NODEV = c::ST_NODEV as u64;
+
+        /// `ST_NODIRATIME`
+        #[cfg(any(linux_kernel, target_os = "emscripten", target_os = "fuchsia"))]
+        const NODIRATIME = c::ST_NODIRATIME as u64;
+
+        /// `ST_NOEXEC`
+        #[cfg(any(linux_kernel, target_os = "emscripten", target_os = "fuchsia"))]
+        const NOEXEC = c::ST_NOEXEC as u64;
+
+        /// `ST_NOSUID`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const NOSUID = c::ST_NOSUID as u64;
+
+        /// `ST_RDONLY`
+        #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+        const RDONLY = c::ST_RDONLY as u64;
+
+        /// `ST_RELATIME`
+        #[cfg(any(target_os = "android", all(target_os = "linux", target_env = "gnu")))]
+        const RELATIME = c::ST_RELATIME as u64;
+
+        /// `ST_SYNCHRONOUS`
+        #[cfg(any(linux_kernel, target_os = "emscripten", target_os = "fuchsia"))]
+        const SYNCHRONOUS = c::ST_SYNCHRONOUS as u64;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `LOCK_*` constants for use with [`flock`] and [`fcntl_lock`].
+///
+/// [`flock`]: crate::fs::flock
+/// [`fcntl_lock`]: crate::fs::fcntl_lock
+#[cfg(not(any(target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+#[repr(u32)]
+pub enum FlockOperation {
+    /// `LOCK_SH`
+    LockShared = bitcast!(c::LOCK_SH),
+    /// `LOCK_EX`
+    LockExclusive = bitcast!(c::LOCK_EX),
+    /// `LOCK_UN`
+    Unlock = bitcast!(c::LOCK_UN),
+    /// `LOCK_SH | LOCK_NB`
+    NonBlockingLockShared = bitcast!(c::LOCK_SH | c::LOCK_NB),
+    /// `LOCK_EX | LOCK_NB`
+    NonBlockingLockExclusive = bitcast!(c::LOCK_EX | c::LOCK_NB),
+    /// `LOCK_UN | LOCK_NB`
+    NonBlockingUnlock = bitcast!(c::LOCK_UN | c::LOCK_NB),
+}
+
+/// `struct stat` for use with [`statat`] and [`fstat`].
+///
+/// [`statat`]: crate::fs::statat
+/// [`fstat`]: crate::fs::fstat
+#[cfg(not(any(linux_like, target_os = "hurd")))]
+pub type Stat = c::stat;
+
+/// `struct stat` for use with [`statat`] and [`fstat`].
+///
+/// [`statat`]: crate::fs::statat
+/// [`fstat`]: crate::fs::fstat
+#[cfg(any(
+    all(linux_kernel, target_pointer_width = "64"),
+    target_os = "hurd",
+    target_os = "emscripten",
+    target_os = "l4re",
+))]
+pub type Stat = c::stat64;
+
+/// `struct stat` for use with [`statat`] and [`fstat`].
+///
+/// [`statat`]: crate::fs::statat
+/// [`fstat`]: crate::fs::fstat
+// On 32-bit, Linux's `struct stat64` has a 32-bit `st_mtime` and friends, so
+// we use our own struct, populated from `statx` where possible, to avoid the
+// y2038 bug.
+#[cfg(all(linux_kernel, target_pointer_width = "32"))]
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+#[allow(missing_docs)]
+pub struct Stat {
+    pub st_dev: u64,
+    pub st_mode: u32,
+    pub st_nlink: u32,
+    pub st_uid: u32,
+    pub st_gid: u32,
+    pub st_rdev: u64,
+    pub st_size: i64,
+    pub st_blksize: u32,
+    pub st_blocks: u64,
+    pub st_atime: u64,
+    pub st_atime_nsec: u32,
+    pub st_mtime: u64,
+    pub st_mtime_nsec: u32,
+    pub st_ctime: u64,
+    pub st_ctime_nsec: u32,
+    pub st_ino: u64,
+}
+
+/// `struct statfs` for use with [`statfs`] and [`fstatfs`].
+///
+/// [`statfs`]: crate::fs::statfs
+/// [`fstatfs`]: crate::fs::fstatfs
+#[cfg(not(any(
+    linux_like,
+    solarish,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "netbsd",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+#[allow(clippy::module_name_repetitions)]
+pub type StatFs = c::statfs;
+
+/// `struct statfs` for use with [`statfs`] and [`fstatfs`].
+///
+/// [`statfs`]: crate::fs::statfs
+/// [`fstatfs`]: crate::fs::fstatfs
+#[cfg(linux_like)]
+pub type StatFs = c::statfs64;
+
+/// `struct statvfs` for use with [`statvfs`] and [`fstatvfs`].
+///
+/// [`statvfs`]: crate::fs::statvfs
+/// [`fstatvfs`]: crate::fs::fstatvfs
+#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+#[allow(missing_docs)]
+pub struct StatVfs {
+    pub f_bsize: u64,
+    pub f_frsize: u64,
+    pub f_blocks: u64,
+    pub f_bfree: u64,
+    pub f_bavail: u64,
+    pub f_files: u64,
+    pub f_ffree: u64,
+    pub f_favail: u64,
+    pub f_fsid: u64,
+    pub f_flag: StatVfsMountFlags,
+    pub f_namemax: u64,
+}
+
+/// `struct statx` for use with [`statx`].
+///
+/// [`statx`]: crate::fs::statx
+#[cfg(all(target_os = "linux", target_env = "gnu"))]
+// Use the glibc `struct statx`.
+pub type Statx = c::statx;
+
+/// `struct statx_timestamp` for use with [`Statx`].
+#[cfg(all(target_os = "linux", target_env = "gnu"))]
+// Use the glibc `struct statx_timestamp`.
+pub type StatxTimestamp = c::statx;
+
+/// `struct statx` for use with [`statx`].
+///
+/// [`statx`]: crate::fs::statx
+// Non-glibc ABIs don't currently declare a `struct statx`, so we declare it
+// ourselves.
+#[cfg(any(
+    target_os = "android",
+    all(target_os = "linux", not(target_env = "gnu")),
+))]
+#[repr(C)]
+#[allow(missing_docs)]
+pub struct Statx {
+    pub stx_mask: u32,
+    pub stx_blksize: u32,
+    pub stx_attributes: u64,
+    pub stx_nlink: u32,
+    pub stx_uid: u32,
+    pub stx_gid: u32,
+    pub stx_mode: u16,
+    __statx_pad1: [u16; 1],
+    pub stx_ino: u64,
+    pub stx_size: u64,
+    pub stx_blocks: u64,
+    pub stx_attributes_mask: u64,
+    pub stx_atime: StatxTimestamp,
+    pub stx_btime: StatxTimestamp,
+    pub stx_ctime: StatxTimestamp,
+    pub stx_mtime: StatxTimestamp,
+    pub stx_rdev_major: u32,
+    pub stx_rdev_minor: u32,
+    pub stx_dev_major: u32,
+    pub stx_dev_minor: u32,
+    pub stx_mnt_id: u64,
+    __statx_pad2: u64,
+    __statx_pad3: [u64; 12],
+}
+
+/// `struct statx_timestamp` for use with [`Statx`].
+// Non-glibc ABIs don't currently declare a `struct statx_timestamp`, so we
+// declare it ourselves.
+#[cfg(any(
+    target_os = "android",
+    all(target_os = "linux", not(target_env = "gnu")),
+))]
+#[repr(C)]
+#[allow(missing_docs)]
+pub struct StatxTimestamp {
+    pub tv_sec: i64,
+    pub tv_nsec: u32,
+    pub __statx_timestamp_pad1: [i32; 1],
+}
+
+/// `mode_t`
+#[cfg(not(all(target_os = "android", target_pointer_width = "32")))]
+pub type RawMode = c::mode_t;
+
+/// `mode_t`
+#[cfg(all(target_os = "android", target_pointer_width = "32"))]
+pub type RawMode = c::c_uint;
+
+/// `dev_t`
+#[cfg(not(all(target_os = "android", target_pointer_width = "32")))]
+pub type Dev = c::dev_t;
+
+/// `dev_t`
+#[cfg(all(target_os = "android", target_pointer_width = "32"))]
+pub type Dev = c::c_ulonglong;
+
+/// `__fsword_t`
+#[cfg(all(
+    target_os = "linux",
+    not(target_env = "musl"),
+    not(target_arch = "s390x"),
+))]
+pub type FsWord = c::__fsword_t;
+
+/// `__fsword_t`
+#[cfg(all(
+    any(target_os = "android", all(target_os = "linux", target_env = "musl")),
+    target_pointer_width = "32",
+))]
+pub type FsWord = u32;
+
+/// `__fsword_t`
+#[cfg(all(
+    any(target_os = "android", all(target_os = "linux", target_env = "musl")),
+    not(target_arch = "s390x"),
+    target_pointer_width = "64",
+))]
+pub type FsWord = u64;
+
+/// `__fsword_t`
+// s390x uses `u32` for `statfs` entries on glibc, even though `__fsword_t` is
+// `u64`.
+#[cfg(all(target_os = "linux", target_arch = "s390x", target_env = "gnu"))]
+pub type FsWord = u32;
+
+/// `__fsword_t`
+// s390x uses `u64` for `statfs` entries on musl.
+#[cfg(all(target_os = "linux", target_arch = "s390x", target_env = "musl"))]
+pub type FsWord = u64;
+
+/// `copyfile_state_t`—State for use with [`fcopyfile`].
+///
+/// [`fcopyfile`]: crate::fs::fcopyfile
+#[cfg(apple)]
+#[allow(non_camel_case_types)]
+#[repr(transparent)]
+#[derive(Copy, Clone)]
+pub struct copyfile_state_t(pub(crate) *mut c::c_void);
diff --git a/vendor/rustix/src/backend/libc/io/errno.rs b/vendor/rustix/src/backend/libc/io/errno.rs
new file mode 100644
index 0000000..805ea67
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/io/errno.rs
@@ -0,0 +1,1052 @@
+//! The `rustix` `Errno` type.
+//!
+//! This type holds an OS error code, which conceptually corresponds to an
+//! `errno` value.
+
+use crate::backend::c;
+use libc_errno::errno;
+
+/// `errno`—An error code.
+///
+/// The error type for `rustix` APIs. This is similar to [`std::io::Error`],
+/// but only holds an OS error code, and no extra error value.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/errno.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/errno.3.html
+/// [Winsock]: https://learn.microsoft.com/en-us/windows/win32/winsock/windows-sockets-error-codes-2
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?errno
+/// [NetBSD]: https://man.netbsd.org/errno.2
+/// [OpenBSD]: https://man.openbsd.org/errno.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=errno&section=2
+/// [illumos]: https://illumos.org/man/3C/errno
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Error-Codes.html
+/// [`std::io::Error`]: Result
+#[repr(transparent)]
+#[doc(alias = "errno")]
+#[derive(Eq, PartialEq, Hash, Copy, Clone)]
+pub struct Errno(pub(crate) c::c_int);
+
+impl Errno {
+    /// `EACCES`
+    #[doc(alias = "ACCES")]
+    pub const ACCESS: Self = Self(c::EACCES);
+    /// `EADDRINUSE`
+    pub const ADDRINUSE: Self = Self(c::EADDRINUSE);
+    /// `EADDRNOTAVAIL`
+    pub const ADDRNOTAVAIL: Self = Self(c::EADDRNOTAVAIL);
+    /// `EADV`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const ADV: Self = Self(c::EADV);
+    /// `EAFNOSUPPORT`
+    #[cfg(not(target_os = "l4re"))]
+    pub const AFNOSUPPORT: Self = Self(c::EAFNOSUPPORT);
+    /// `EAGAIN`
+    pub const AGAIN: Self = Self(c::EAGAIN);
+    /// `EALREADY`
+    #[cfg(not(target_os = "l4re"))]
+    pub const ALREADY: Self = Self(c::EALREADY);
+    /// `EAUTH`
+    #[cfg(bsd)]
+    pub const AUTH: Self = Self(c::EAUTH);
+    /// `EBADE`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const BADE: Self = Self(c::EBADE);
+    /// `EBADF`
+    pub const BADF: Self = Self(c::EBADF);
+    /// `EBADFD`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const BADFD: Self = Self(c::EBADFD);
+    /// `EBADMSG`
+    #[cfg(not(any(windows, target_os = "l4re")))]
+    pub const BADMSG: Self = Self(c::EBADMSG);
+    /// `EBADR`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const BADR: Self = Self(c::EBADR);
+    /// `EBADRPC`
+    #[cfg(bsd)]
+    pub const BADRPC: Self = Self(c::EBADRPC);
+    /// `EBADRQC`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const BADRQC: Self = Self(c::EBADRQC);
+    /// `EBADSLT`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const BADSLT: Self = Self(c::EBADSLT);
+    /// `EBFONT`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const BFONT: Self = Self(c::EBFONT);
+    /// `EBUSY`
+    #[cfg(not(windows))]
+    pub const BUSY: Self = Self(c::EBUSY);
+    /// `ECANCELED`
+    #[cfg(not(target_os = "l4re"))]
+    pub const CANCELED: Self = Self(c::ECANCELED);
+    /// `ECAPMODE`
+    #[cfg(target_os = "freebsd")]
+    pub const CAPMODE: Self = Self(c::ECAPMODE);
+    /// `ECHILD`
+    #[cfg(not(windows))]
+    pub const CHILD: Self = Self(c::ECHILD);
+    /// `ECHRNG`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi"
+    )))]
+    pub const CHRNG: Self = Self(c::ECHRNG);
+    /// `ECOMM`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const COMM: Self = Self(c::ECOMM);
+    /// `ECONNABORTED`
+    pub const CONNABORTED: Self = Self(c::ECONNABORTED);
+    /// `ECONNREFUSED`
+    pub const CONNREFUSED: Self = Self(c::ECONNREFUSED);
+    /// `ECONNRESET`
+    pub const CONNRESET: Self = Self(c::ECONNRESET);
+    /// `EDEADLK`
+    #[cfg(not(windows))]
+    pub const DEADLK: Self = Self(c::EDEADLK);
+    /// `EDEADLOCK`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "android",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const DEADLOCK: Self = Self(c::EDEADLOCK);
+    /// `EDESTADDRREQ`
+    #[cfg(not(target_os = "l4re"))]
+    pub const DESTADDRREQ: Self = Self(c::EDESTADDRREQ);
+    /// `EDISCON`
+    #[cfg(windows)]
+    pub const DISCON: Self = Self(c::EDISCON);
+    /// `EDOM`
+    #[cfg(not(windows))]
+    pub const DOM: Self = Self(c::EDOM);
+    /// `EDOOFUS`
+    #[cfg(freebsdlike)]
+    pub const DOOFUS: Self = Self(c::EDOOFUS);
+    /// `EDOTDOT`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "nto",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const DOTDOT: Self = Self(c::EDOTDOT);
+    /// `EDQUOT`
+    pub const DQUOT: Self = Self(c::EDQUOT);
+    /// `EEXIST`
+    #[cfg(not(windows))]
+    pub const EXIST: Self = Self(c::EEXIST);
+    /// `EFAULT`
+    pub const FAULT: Self = Self(c::EFAULT);
+    /// `EFBIG`
+    #[cfg(not(windows))]
+    pub const FBIG: Self = Self(c::EFBIG);
+    /// `EFTYPE`
+    #[cfg(any(bsd, target_env = "newlib"))]
+    pub const FTYPE: Self = Self(c::EFTYPE);
+    /// `EHOSTDOWN`
+    #[cfg(not(any(target_os = "l4re", target_os = "wasi")))]
+    pub const HOSTDOWN: Self = Self(c::EHOSTDOWN);
+    /// `EHOSTUNREACH`
+    pub const HOSTUNREACH: Self = Self(c::EHOSTUNREACH);
+    /// `EHWPOISON`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "android",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "nto",
+        target_os = "redox",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const HWPOISON: Self = Self(c::EHWPOISON);
+    /// `EIDRM`
+    #[cfg(not(any(windows, target_os = "l4re")))]
+    pub const IDRM: Self = Self(c::EIDRM);
+    /// `EILSEQ`
+    #[cfg(not(any(windows, target_os = "l4re")))]
+    pub const ILSEQ: Self = Self(c::EILSEQ);
+    /// `EINPROGRESS`
+    #[cfg(not(target_os = "l4re"))]
+    pub const INPROGRESS: Self = Self(c::EINPROGRESS);
+    /// `EINTR`
+    ///
+    /// For a convenient way to retry system calls that exit with `INTR`, use
+    /// [`retry_on_intr`].
+    ///
+    /// [`retry_on_intr`]: crate::io::retry_on_intr
+    pub const INTR: Self = Self(c::EINTR);
+    /// `EINVAL`
+    pub const INVAL: Self = Self(c::EINVAL);
+    /// `EINVALIDPROCTABLE`
+    #[cfg(windows)]
+    pub const INVALIDPROCTABLE: Self = Self(c::EINVALIDPROCTABLE);
+    /// `EINVALIDPROVIDER`
+    #[cfg(windows)]
+    pub const INVALIDPROVIDER: Self = Self(c::EINVALIDPROVIDER);
+    /// `EIO`
+    #[cfg(not(windows))]
+    pub const IO: Self = Self(c::EIO);
+    /// `EISCONN`
+    #[cfg(not(target_os = "l4re"))]
+    pub const ISCONN: Self = Self(c::EISCONN);
+    /// `EISDIR`
+    #[cfg(not(windows))]
+    pub const ISDIR: Self = Self(c::EISDIR);
+    /// `EISNAM`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "nto",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const ISNAM: Self = Self(c::EISNAM);
+    /// `EKEYEXPIRED`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "nto",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const KEYEXPIRED: Self = Self(c::EKEYEXPIRED);
+    /// `EKEYREJECTED`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "nto",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const KEYREJECTED: Self = Self(c::EKEYREJECTED);
+    /// `EKEYREVOKED`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "nto",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const KEYREVOKED: Self = Self(c::EKEYREVOKED);
+    /// `EL2HLT`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi"
+    )))]
+    pub const L2HLT: Self = Self(c::EL2HLT);
+    /// `EL2NSYNC`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi"
+    )))]
+    pub const L2NSYNC: Self = Self(c::EL2NSYNC);
+    /// `EL3HLT`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi"
+    )))]
+    pub const L3HLT: Self = Self(c::EL3HLT);
+    /// `EL3RST`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi"
+    )))]
+    pub const L3RST: Self = Self(c::EL3RST);
+    /// `ELIBACC`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const LIBACC: Self = Self(c::ELIBACC);
+    /// `ELIBBAD`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const LIBBAD: Self = Self(c::ELIBBAD);
+    /// `ELIBEXEC`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const LIBEXEC: Self = Self(c::ELIBEXEC);
+    /// `ELIBMAX`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const LIBMAX: Self = Self(c::ELIBMAX);
+    /// `ELIBSCN`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const LIBSCN: Self = Self(c::ELIBSCN);
+    /// `ELNRNG`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi"
+    )))]
+    pub const LNRNG: Self = Self(c::ELNRNG);
+    /// `ELOOP`
+    pub const LOOP: Self = Self(c::ELOOP);
+    /// `EMEDIUMTYPE`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "nto",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const MEDIUMTYPE: Self = Self(c::EMEDIUMTYPE);
+    /// `EMFILE`
+    pub const MFILE: Self = Self(c::EMFILE);
+    /// `EMLINK`
+    #[cfg(not(windows))]
+    pub const MLINK: Self = Self(c::EMLINK);
+    /// `EMSGSIZE`
+    #[cfg(not(target_os = "l4re"))]
+    pub const MSGSIZE: Self = Self(c::EMSGSIZE);
+    /// `EMULTIHOP`
+    #[cfg(not(any(windows, target_os = "l4re", target_os = "openbsd")))]
+    pub const MULTIHOP: Self = Self(c::EMULTIHOP);
+    /// `ENAMETOOLONG`
+    pub const NAMETOOLONG: Self = Self(c::ENAMETOOLONG);
+    /// `ENAVAIL`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "nto",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const NAVAIL: Self = Self(c::ENAVAIL);
+    /// `ENEEDAUTH`
+    #[cfg(bsd)]
+    pub const NEEDAUTH: Self = Self(c::ENEEDAUTH);
+    /// `ENETDOWN`
+    pub const NETDOWN: Self = Self(c::ENETDOWN);
+    /// `ENETRESET`
+    #[cfg(not(target_os = "l4re"))]
+    pub const NETRESET: Self = Self(c::ENETRESET);
+    /// `ENETUNREACH`
+    pub const NETUNREACH: Self = Self(c::ENETUNREACH);
+    /// `ENFILE`
+    #[cfg(not(windows))]
+    pub const NFILE: Self = Self(c::ENFILE);
+    /// `ENOANO`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const NOANO: Self = Self(c::ENOANO);
+    /// `ENOATTR`
+    #[cfg(any(bsd, target_os = "haiku"))]
+    pub const NOATTR: Self = Self(c::ENOATTR);
+    /// `ENOBUFS`
+    #[cfg(not(target_os = "l4re"))]
+    pub const NOBUFS: Self = Self(c::ENOBUFS);
+    /// `ENOCSI`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi"
+    )))]
+    pub const NOCSI: Self = Self(c::ENOCSI);
+    /// `ENODATA`
+    #[cfg(not(any(
+        freebsdlike,
+        windows,
+        target_os = "haiku",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const NODATA: Self = Self(c::ENODATA);
+    /// `ENODEV`
+    #[cfg(not(windows))]
+    pub const NODEV: Self = Self(c::ENODEV);
+    /// `ENOENT`
+    #[cfg(not(windows))]
+    pub const NOENT: Self = Self(c::ENOENT);
+    /// `ENOEXEC`
+    #[cfg(not(windows))]
+    pub const NOEXEC: Self = Self(c::ENOEXEC);
+    /// `ENOKEY`
+    #[cfg(not(any(
+        solarish,
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "nto",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const NOKEY: Self = Self(c::ENOKEY);
+    /// `ENOLCK`
+    #[cfg(not(any(windows, target_os = "l4re")))]
+    pub const NOLCK: Self = Self(c::ENOLCK);
+    /// `ENOLINK`
+    #[cfg(not(any(windows, target_os = "l4re", target_os = "openbsd")))]
+    pub const NOLINK: Self = Self(c::ENOLINK);
+    /// `ENOMEDIUM`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "nto",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const NOMEDIUM: Self = Self(c::ENOMEDIUM);
+    /// `ENOMEM`
+    #[cfg(not(windows))]
+    pub const NOMEM: Self = Self(c::ENOMEM);
+    /// `ENOMORE`
+    #[cfg(windows)]
+    pub const NOMORE: Self = Self(c::ENOMORE);
+    /// `ENOMSG`
+    #[cfg(not(any(windows, target_os = "l4re")))]
+    pub const NOMSG: Self = Self(c::ENOMSG);
+    /// `ENONET`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const NONET: Self = Self(c::ENONET);
+    /// `ENOPKG`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const NOPKG: Self = Self(c::ENOPKG);
+    /// `ENOPROTOOPT`
+    #[cfg(not(target_os = "l4re"))]
+    pub const NOPROTOOPT: Self = Self(c::ENOPROTOOPT);
+    /// `ENOSPC`
+    #[cfg(not(windows))]
+    pub const NOSPC: Self = Self(c::ENOSPC);
+    /// `ENOSR`
+    #[cfg(not(any(
+        freebsdlike,
+        windows,
+        target_os = "haiku",
+        target_os = "l4re",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const NOSR: Self = Self(c::ENOSR);
+    /// `ENOSTR`
+    #[cfg(not(any(
+        freebsdlike,
+        windows,
+        target_os = "haiku",
+        target_os = "l4re",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const NOSTR: Self = Self(c::ENOSTR);
+    /// `ENOSYS`
+    #[cfg(not(windows))]
+    pub const NOSYS: Self = Self(c::ENOSYS);
+    /// `ENOTBLK`
+    #[cfg(not(any(
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita",
+        target_os = "wasi"
+    )))]
+    pub const NOTBLK: Self = Self(c::ENOTBLK);
+    /// `ENOTCAPABLE`
+    #[cfg(any(target_os = "freebsd", target_os = "wasi"))]
+    pub const NOTCAPABLE: Self = Self(c::ENOTCAPABLE);
+    /// `ENOTCONN`
+    pub const NOTCONN: Self = Self(c::ENOTCONN);
+    /// `ENOTDIR`
+    #[cfg(not(windows))]
+    pub const NOTDIR: Self = Self(c::ENOTDIR);
+    /// `ENOTEMPTY`
+    pub const NOTEMPTY: Self = Self(c::ENOTEMPTY);
+    /// `ENOTNAM`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "nto",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const NOTNAM: Self = Self(c::ENOTNAM);
+    /// `ENOTRECOVERABLE`
+    #[cfg(not(any(
+        freebsdlike,
+        netbsdlike,
+        windows,
+        target_os = "haiku",
+        target_os = "l4re"
+    )))]
+    pub const NOTRECOVERABLE: Self = Self(c::ENOTRECOVERABLE);
+    /// `ENOTSOCK`
+    #[cfg(not(target_os = "l4re"))]
+    pub const NOTSOCK: Self = Self(c::ENOTSOCK);
+    /// `ENOTSUP`
+    #[cfg(not(any(windows, target_os = "haiku", target_os = "redox")))]
+    pub const NOTSUP: Self = Self(c::ENOTSUP);
+    /// `ENOTTY`
+    #[cfg(not(windows))]
+    pub const NOTTY: Self = Self(c::ENOTTY);
+    /// `ENOTUNIQ`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const NOTUNIQ: Self = Self(c::ENOTUNIQ);
+    /// `ENXIO`
+    #[cfg(not(windows))]
+    pub const NXIO: Self = Self(c::ENXIO);
+    /// `EOPNOTSUPP`
+    pub const OPNOTSUPP: Self = Self(c::EOPNOTSUPP);
+    /// `EOVERFLOW`
+    #[cfg(not(any(windows, target_os = "l4re")))]
+    pub const OVERFLOW: Self = Self(c::EOVERFLOW);
+    /// `EOWNERDEAD`
+    #[cfg(not(any(
+        freebsdlike,
+        netbsdlike,
+        windows,
+        target_os = "haiku",
+        target_os = "l4re"
+    )))]
+    pub const OWNERDEAD: Self = Self(c::EOWNERDEAD);
+    /// `EPERM`
+    #[cfg(not(windows))]
+    pub const PERM: Self = Self(c::EPERM);
+    /// `EPFNOSUPPORT`
+    #[cfg(not(any(target_os = "l4re", target_os = "wasi")))]
+    pub const PFNOSUPPORT: Self = Self(c::EPFNOSUPPORT);
+    /// `EPIPE`
+    #[cfg(not(windows))]
+    pub const PIPE: Self = Self(c::EPIPE);
+    /// `EPROCLIM`
+    #[cfg(bsd)]
+    pub const PROCLIM: Self = Self(c::EPROCLIM);
+    /// `EPROCUNAVAIL`
+    #[cfg(bsd)]
+    pub const PROCUNAVAIL: Self = Self(c::EPROCUNAVAIL);
+    /// `EPROGMISMATCH`
+    #[cfg(bsd)]
+    pub const PROGMISMATCH: Self = Self(c::EPROGMISMATCH);
+    /// `EPROGUNAVAIL`
+    #[cfg(bsd)]
+    pub const PROGUNAVAIL: Self = Self(c::EPROGUNAVAIL);
+    /// `EPROTO`
+    #[cfg(not(any(windows, target_os = "l4re")))]
+    pub const PROTO: Self = Self(c::EPROTO);
+    /// `EPROTONOSUPPORT`
+    #[cfg(not(target_os = "l4re"))]
+    pub const PROTONOSUPPORT: Self = Self(c::EPROTONOSUPPORT);
+    /// `EPROTOTYPE`
+    #[cfg(not(target_os = "l4re"))]
+    pub const PROTOTYPE: Self = Self(c::EPROTOTYPE);
+    /// `EPROVIDERFAILEDINIT`
+    #[cfg(windows)]
+    pub const PROVIDERFAILEDINIT: Self = Self(c::EPROVIDERFAILEDINIT);
+    /// `ERANGE`
+    #[cfg(not(windows))]
+    pub const RANGE: Self = Self(c::ERANGE);
+    /// `EREFUSED`
+    #[cfg(windows)]
+    pub const REFUSED: Self = Self(c::EREFUSED);
+    /// `EREMCHG`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const REMCHG: Self = Self(c::EREMCHG);
+    /// `EREMOTE`
+    #[cfg(not(any(
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi"
+    )))]
+    pub const REMOTE: Self = Self(c::EREMOTE);
+    /// `EREMOTEIO`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "nto",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const REMOTEIO: Self = Self(c::EREMOTEIO);
+    /// `ERESTART`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi"
+    )))]
+    pub const RESTART: Self = Self(c::ERESTART);
+    /// `ERFKILL`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "android",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "nto",
+        target_os = "redox",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const RFKILL: Self = Self(c::ERFKILL);
+    /// `EROFS`
+    #[cfg(not(windows))]
+    pub const ROFS: Self = Self(c::EROFS);
+    /// `ERPCMISMATCH`
+    #[cfg(bsd)]
+    pub const RPCMISMATCH: Self = Self(c::ERPCMISMATCH);
+    /// `ESHUTDOWN`
+    #[cfg(not(any(
+        target_os = "espidf",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi"
+    )))]
+    pub const SHUTDOWN: Self = Self(c::ESHUTDOWN);
+    /// `ESOCKTNOSUPPORT`
+    #[cfg(not(any(
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi"
+    )))]
+    pub const SOCKTNOSUPPORT: Self = Self(c::ESOCKTNOSUPPORT);
+    /// `ESPIPE`
+    #[cfg(not(windows))]
+    pub const SPIPE: Self = Self(c::ESPIPE);
+    /// `ESRCH`
+    #[cfg(not(windows))]
+    pub const SRCH: Self = Self(c::ESRCH);
+    /// `ESRMNT`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const SRMNT: Self = Self(c::ESRMNT);
+    /// `ESTALE`
+    pub const STALE: Self = Self(c::ESTALE);
+    /// `ESTRPIPE`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const STRPIPE: Self = Self(c::ESTRPIPE);
+    /// `ETIME`
+    #[cfg(not(any(
+        freebsdlike,
+        windows,
+        target_os = "l4re",
+        target_os = "openbsd",
+        target_os = "wasi"
+    )))]
+    pub const TIME: Self = Self(c::ETIME);
+    /// `ETIMEDOUT`
+    pub const TIMEDOUT: Self = Self(c::ETIMEDOUT);
+    /// `E2BIG`
+    #[cfg(not(windows))]
+    #[doc(alias = "2BIG")]
+    pub const TOOBIG: Self = Self(c::E2BIG);
+    /// `ETOOMANYREFS`
+    #[cfg(not(any(target_os = "haiku", target_os = "l4re", target_os = "wasi")))]
+    pub const TOOMANYREFS: Self = Self(c::ETOOMANYREFS);
+    /// `ETXTBSY`
+    #[cfg(not(windows))]
+    pub const TXTBSY: Self = Self(c::ETXTBSY);
+    /// `EUCLEAN`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "nto",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const UCLEAN: Self = Self(c::EUCLEAN);
+    /// `EUNATCH`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi"
+    )))]
+    pub const UNATCH: Self = Self(c::EUNATCH);
+    /// `EUSERS`
+    #[cfg(not(any(
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi"
+    )))]
+    pub const USERS: Self = Self(c::EUSERS);
+    /// `EWOULDBLOCK`
+    pub const WOULDBLOCK: Self = Self(c::EWOULDBLOCK);
+    /// `EXDEV`
+    #[cfg(not(windows))]
+    pub const XDEV: Self = Self(c::EXDEV);
+    /// `EXFULL`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "l4re",
+        target_os = "vita",
+        target_os = "wasi",
+    )))]
+    pub const XFULL: Self = Self(c::EXFULL);
+}
+
+impl Errno {
+    /// Extract an `Errno` value from a `std::io::Error`.
+    ///
+    /// This isn't a `From` conversion because it's expected to be relatively
+    /// uncommon.
+    #[cfg(feature = "std")]
+    #[inline]
+    pub fn from_io_error(io_err: &std::io::Error) -> Option<Self> {
+        io_err
+            .raw_os_error()
+            .and_then(|raw| if raw != 0 { Some(Self(raw)) } else { None })
+    }
+
+    /// Extract the raw OS error number from this error.
+    #[inline]
+    pub const fn raw_os_error(self) -> i32 {
+        self.0
+    }
+
+    /// Construct an `Errno` from a raw OS error number.
+    #[inline]
+    pub const fn from_raw_os_error(raw: i32) -> Self {
+        Self(raw)
+    }
+
+    pub(crate) fn last_os_error() -> Self {
+        Self(errno().0)
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/io/mod.rs b/vendor/rustix/src/backend/libc/io/mod.rs
new file mode 100644
index 0000000..4873885
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/io/mod.rs
@@ -0,0 +1,6 @@
+pub(crate) mod errno;
+#[cfg(not(windows))]
+pub(crate) mod types;
+
+#[cfg_attr(windows, path = "windows_syscalls.rs")]
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/libc/io/syscalls.rs b/vendor/rustix/src/backend/libc/io/syscalls.rs
new file mode 100644
index 0000000..e28e6be
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/io/syscalls.rs
@@ -0,0 +1,340 @@
+//! libc syscalls supporting `rustix::io`.
+
+use crate::backend::c;
+#[cfg(not(target_os = "wasi"))]
+use crate::backend::conv::ret_discarded_fd;
+use crate::backend::conv::{borrowed_fd, ret, ret_c_int, ret_owned_fd, ret_usize};
+use crate::fd::{AsFd, BorrowedFd, OwnedFd, RawFd};
+#[cfg(not(any(
+    target_os = "aix",
+    target_os = "espidf",
+    target_os = "nto",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+use crate::io::DupFlags;
+#[cfg(linux_kernel)]
+use crate::io::ReadWriteFlags;
+use crate::io::{self, FdFlags};
+use crate::ioctl::{IoctlOutput, RawOpcode};
+use core::cmp::min;
+#[cfg(all(feature = "fs", feature = "net"))]
+use libc_errno::errno;
+#[cfg(not(target_os = "espidf"))]
+use {
+    crate::backend::MAX_IOV,
+    crate::io::{IoSlice, IoSliceMut},
+};
+
+pub(crate) unsafe fn read(fd: BorrowedFd<'_>, buf: *mut u8, len: usize) -> io::Result<usize> {
+    ret_usize(c::read(borrowed_fd(fd), buf.cast(), min(len, READ_LIMIT)))
+}
+
+pub(crate) fn write(fd: BorrowedFd<'_>, buf: &[u8]) -> io::Result<usize> {
+    unsafe {
+        ret_usize(c::write(
+            borrowed_fd(fd),
+            buf.as_ptr().cast(),
+            min(buf.len(), READ_LIMIT),
+        ))
+    }
+}
+
+pub(crate) unsafe fn pread(
+    fd: BorrowedFd<'_>,
+    buf: *mut u8,
+    len: usize,
+    offset: u64,
+) -> io::Result<usize> {
+    let len = min(len, READ_LIMIT);
+
+    // Silently cast; we'll get `EINVAL` if the value is negative.
+    let offset = offset as i64;
+
+    // ESP-IDF and Vita don't support 64-bit offsets.
+    #[cfg(any(target_os = "espidf", target_os = "vita"))]
+    let offset: i32 = offset.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+
+    ret_usize(c::pread(borrowed_fd(fd), buf.cast(), len, offset))
+}
+
+pub(crate) fn pwrite(fd: BorrowedFd<'_>, buf: &[u8], offset: u64) -> io::Result<usize> {
+    let len = min(buf.len(), READ_LIMIT);
+
+    // Silently cast; we'll get `EINVAL` if the value is negative.
+    let offset = offset as i64;
+
+    // ESP-IDF and Vita don't support 64-bit offsets.
+    #[cfg(any(target_os = "espidf", target_os = "vita"))]
+    let offset: i32 = offset.try_into().map_err(|_| io::Errno::OVERFLOW)?;
+
+    unsafe { ret_usize(c::pwrite(borrowed_fd(fd), buf.as_ptr().cast(), len, offset)) }
+}
+
+#[cfg(not(target_os = "espidf"))]
+pub(crate) fn readv(fd: BorrowedFd<'_>, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
+    unsafe {
+        ret_usize(c::readv(
+            borrowed_fd(fd),
+            bufs.as_ptr().cast::<c::iovec>(),
+            min(bufs.len(), MAX_IOV) as c::c_int,
+        ))
+    }
+}
+
+#[cfg(not(target_os = "espidf"))]
+pub(crate) fn writev(fd: BorrowedFd<'_>, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
+    unsafe {
+        ret_usize(c::writev(
+            borrowed_fd(fd),
+            bufs.as_ptr().cast::<c::iovec>(),
+            min(bufs.len(), MAX_IOV) as c::c_int,
+        ))
+    }
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "solaris",
+    target_os = "vita"
+)))]
+pub(crate) fn preadv(
+    fd: BorrowedFd<'_>,
+    bufs: &mut [IoSliceMut<'_>],
+    offset: u64,
+) -> io::Result<usize> {
+    // Silently cast; we'll get `EINVAL` if the value is negative.
+    let offset = offset as i64;
+    unsafe {
+        ret_usize(c::preadv(
+            borrowed_fd(fd),
+            bufs.as_ptr().cast::<c::iovec>(),
+            min(bufs.len(), MAX_IOV) as c::c_int,
+            offset,
+        ))
+    }
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "solaris",
+    target_os = "vita"
+)))]
+pub(crate) fn pwritev(fd: BorrowedFd<'_>, bufs: &[IoSlice<'_>], offset: u64) -> io::Result<usize> {
+    // Silently cast; we'll get `EINVAL` if the value is negative.
+    let offset = offset as i64;
+    unsafe {
+        ret_usize(c::pwritev(
+            borrowed_fd(fd),
+            bufs.as_ptr().cast::<c::iovec>(),
+            min(bufs.len(), MAX_IOV) as c::c_int,
+            offset,
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+pub(crate) fn preadv2(
+    fd: BorrowedFd<'_>,
+    bufs: &mut [IoSliceMut<'_>],
+    offset: u64,
+    flags: ReadWriteFlags,
+) -> io::Result<usize> {
+    // Silently cast; we'll get `EINVAL` if the value is negative.
+    let offset = offset as i64;
+    unsafe {
+        ret_usize(c::preadv2(
+            borrowed_fd(fd),
+            bufs.as_ptr().cast::<c::iovec>(),
+            min(bufs.len(), MAX_IOV) as c::c_int,
+            offset,
+            bitflags_bits!(flags),
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+pub(crate) fn pwritev2(
+    fd: BorrowedFd<'_>,
+    bufs: &[IoSlice<'_>],
+    offset: u64,
+    flags: ReadWriteFlags,
+) -> io::Result<usize> {
+    // Silently cast; we'll get `EINVAL` if the value is negative.
+    let offset = offset as i64;
+    unsafe {
+        ret_usize(c::pwritev2(
+            borrowed_fd(fd),
+            bufs.as_ptr().cast::<c::iovec>(),
+            min(bufs.len(), MAX_IOV) as c::c_int,
+            offset,
+            bitflags_bits!(flags),
+        ))
+    }
+}
+
+// These functions are derived from Rust's library/std/src/sys/unix/fd.rs at
+// revision 326ef470a8b379a180d6dc4bbef08990698a737a.
+
+// The maximum read limit on most POSIX-like systems is `SSIZE_MAX`, with the
+// manual page quoting that if the count of bytes to read is greater than
+// `SSIZE_MAX` the result is “unspecified”.
+//
+// On macOS, however, apparently the 64-bit libc is either buggy or
+// intentionally showing odd behavior by rejecting any read with a size larger
+// than or equal to `INT_MAX`. To handle both of these the read size is capped
+// on both platforms.
+#[cfg(target_os = "macos")]
+const READ_LIMIT: usize = c::c_int::MAX as usize - 1;
+#[cfg(not(target_os = "macos"))]
+const READ_LIMIT: usize = c::ssize_t::MAX as usize;
+
+pub(crate) unsafe fn close(raw_fd: RawFd) {
+    let _ = c::close(raw_fd as c::c_int);
+}
+
+#[inline]
+pub(crate) unsafe fn ioctl(
+    fd: BorrowedFd<'_>,
+    request: RawOpcode,
+    arg: *mut c::c_void,
+) -> io::Result<IoctlOutput> {
+    ret_c_int(c::ioctl(borrowed_fd(fd), request, arg))
+}
+
+#[inline]
+pub(crate) unsafe fn ioctl_readonly(
+    fd: BorrowedFd<'_>,
+    request: RawOpcode,
+    arg: *mut c::c_void,
+) -> io::Result<IoctlOutput> {
+    ioctl(fd, request, arg)
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+#[cfg(all(feature = "fs", feature = "net"))]
+pub(crate) fn is_read_write(fd: BorrowedFd<'_>) -> io::Result<(bool, bool)> {
+    use core::mem::MaybeUninit;
+
+    let (mut read, mut write) = crate::fs::fd::_is_file_read_write(fd)?;
+    let mut not_socket = false;
+    if read {
+        // Do a `recv` with `PEEK` and `DONTWAIT` for 1 byte. A 0 indicates
+        // the read side is shut down; an `EWOULDBLOCK` indicates the read
+        // side is still open.
+        match unsafe {
+            c::recv(
+                borrowed_fd(fd),
+                MaybeUninit::<[u8; 1]>::uninit()
+                    .as_mut_ptr()
+                    .cast::<c::c_void>(),
+                1,
+                c::MSG_PEEK | c::MSG_DONTWAIT,
+            )
+        } {
+            0 => read = false,
+            -1 => {
+                #[allow(unreachable_patterns)] // `EAGAIN` may equal `EWOULDBLOCK`
+                match errno().0 {
+                    c::EAGAIN | c::EWOULDBLOCK => (),
+                    c::ENOTSOCK => not_socket = true,
+                    err => return Err(io::Errno(err)),
+                }
+            }
+            _ => (),
+        }
+    }
+    if write && !not_socket {
+        // Do a `send` with `DONTWAIT` for 0 bytes. An `EPIPE` indicates
+        // the write side is shut down.
+        if unsafe { c::send(borrowed_fd(fd), [].as_ptr(), 0, c::MSG_DONTWAIT) } == -1 {
+            #[allow(unreachable_patterns)] // `EAGAIN` may equal `EWOULDBLOCK`
+            match errno().0 {
+                c::EAGAIN | c::EWOULDBLOCK | c::ENOTSOCK => (),
+                c::EPIPE => write = false,
+                err => return Err(io::Errno(err)),
+            }
+        }
+    }
+    Ok((read, write))
+}
+
+#[cfg(target_os = "wasi")]
+#[cfg(all(feature = "fs", feature = "net"))]
+pub(crate) fn is_read_write(_fd: BorrowedFd<'_>) -> io::Result<(bool, bool)> {
+    todo!("Implement is_read_write for WASI in terms of fd_fdstat_get");
+}
+
+pub(crate) fn fcntl_getfd(fd: BorrowedFd<'_>) -> io::Result<FdFlags> {
+    let flags = unsafe { ret_c_int(c::fcntl(borrowed_fd(fd), c::F_GETFD))? };
+    Ok(FdFlags::from_bits_retain(bitcast!(flags)))
+}
+
+pub(crate) fn fcntl_setfd(fd: BorrowedFd<'_>, flags: FdFlags) -> io::Result<()> {
+    unsafe { ret(c::fcntl(borrowed_fd(fd), c::F_SETFD, flags.bits())) }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+pub(crate) fn fcntl_dupfd_cloexec(fd: BorrowedFd<'_>, min: RawFd) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(c::fcntl(borrowed_fd(fd), c::F_DUPFD_CLOEXEC, min)) }
+}
+
+#[cfg(target_os = "espidf")]
+pub(crate) fn fcntl_dupfd(fd: BorrowedFd<'_>, min: RawFd) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(c::fcntl(borrowed_fd(fd), c::F_DUPFD, min)) }
+}
+
+#[cfg(not(target_os = "wasi"))]
+pub(crate) fn dup(fd: BorrowedFd<'_>) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(c::dup(borrowed_fd(fd))) }
+}
+
+#[allow(clippy::needless_pass_by_ref_mut)]
+#[cfg(not(target_os = "wasi"))]
+pub(crate) fn dup2(fd: BorrowedFd<'_>, new: &mut OwnedFd) -> io::Result<()> {
+    unsafe { ret_discarded_fd(c::dup2(borrowed_fd(fd), borrowed_fd(new.as_fd()))) }
+}
+
+#[allow(clippy::needless_pass_by_ref_mut)]
+#[cfg(not(any(
+    apple,
+    target_os = "aix",
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+pub(crate) fn dup3(fd: BorrowedFd<'_>, new: &mut OwnedFd, flags: DupFlags) -> io::Result<()> {
+    unsafe {
+        ret_discarded_fd(c::dup3(
+            borrowed_fd(fd),
+            borrowed_fd(new.as_fd()),
+            bitflags_bits!(flags),
+        ))
+    }
+}
+
+#[cfg(any(
+    apple,
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "haiku",
+    target_os = "redox",
+))]
+pub(crate) fn dup3(fd: BorrowedFd<'_>, new: &mut OwnedFd, _flags: DupFlags) -> io::Result<()> {
+    // Android 5.0 has `dup3`, but libc doesn't have bindings. Emulate it
+    // using `dup2`. We don't need to worry about the difference between
+    // `dup2` and `dup3` when the file descriptors are equal because we
+    // have an `&mut OwnedFd` which means `fd` doesn't alias it.
+    dup2(fd, new)
+}
diff --git a/vendor/rustix/src/backend/libc/io/types.rs b/vendor/rustix/src/backend/libc/io/types.rs
new file mode 100644
index 0000000..510206f
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/io/types.rs
@@ -0,0 +1,65 @@
+use crate::backend::c;
+use bitflags::bitflags;
+
+bitflags! {
+    /// `FD_*` constants for use with [`fcntl_getfd`] and [`fcntl_setfd`].
+    ///
+    /// [`fcntl_getfd`]: crate::io::fcntl_getfd
+    /// [`fcntl_setfd`]: crate::io::fcntl_setfd
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct FdFlags: u32 {
+        /// `FD_CLOEXEC`
+        const CLOEXEC = bitcast!(c::FD_CLOEXEC);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `RWF_*` constants for use with [`preadv2`] and [`pwritev2`].
+    ///
+    /// [`preadv2`]: crate::io::preadv2
+    /// [`pwritev2`]: crate::io::pwritev
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct ReadWriteFlags: u32 {
+        /// `RWF_DSYNC` (since Linux 4.7)
+        const DSYNC = linux_raw_sys::general::RWF_DSYNC;
+        /// `RWF_HIPRI` (since Linux 4.6)
+        const HIPRI = linux_raw_sys::general::RWF_HIPRI;
+        /// `RWF_SYNC` (since Linux 4.7)
+        const SYNC = linux_raw_sys::general::RWF_SYNC;
+        /// `RWF_NOWAIT` (since Linux 4.14)
+        const NOWAIT = linux_raw_sys::general::RWF_NOWAIT;
+        /// `RWF_APPEND` (since Linux 4.16)
+        const APPEND = linux_raw_sys::general::RWF_APPEND;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+bitflags! {
+    /// `O_*` constants for use with [`dup2`].
+    ///
+    /// [`dup2`]: crate::io::dup2
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct DupFlags: u32 {
+        /// `O_CLOEXEC`
+        #[cfg(not(any(
+            apple,
+            target_os = "aix",
+            target_os = "android",
+            target_os = "redox",
+        )))] // Android 5.0 has dup3, but libc doesn't have bindings
+        const CLOEXEC = bitcast!(c::O_CLOEXEC);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/io/windows_syscalls.rs b/vendor/rustix/src/backend/libc/io/windows_syscalls.rs
new file mode 100644
index 0000000..049221d
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/io/windows_syscalls.rs
@@ -0,0 +1,30 @@
+//! Windows system calls in the `io` module.
+
+use crate::backend::c;
+use crate::backend::conv::{borrowed_fd, ret_c_int};
+use crate::backend::fd::LibcFd;
+use crate::fd::{BorrowedFd, RawFd};
+use crate::io;
+use crate::ioctl::{IoctlOutput, RawOpcode};
+
+pub(crate) unsafe fn close(raw_fd: RawFd) {
+    let _ = c::close(raw_fd as LibcFd);
+}
+
+#[inline]
+pub(crate) unsafe fn ioctl(
+    fd: BorrowedFd<'_>,
+    request: RawOpcode,
+    arg: *mut c::c_void,
+) -> io::Result<IoctlOutput> {
+    ret_c_int(c::ioctl(borrowed_fd(fd), request, arg.cast()))
+}
+
+#[inline]
+pub(crate) unsafe fn ioctl_readonly(
+    fd: BorrowedFd<'_>,
+    request: RawOpcode,
+    arg: *mut c::c_void,
+) -> io::Result<IoctlOutput> {
+    ioctl(fd, request, arg)
+}
diff --git a/vendor/rustix/src/backend/libc/io_uring/mod.rs b/vendor/rustix/src/backend/libc/io_uring/mod.rs
new file mode 100644
index 0000000..ef944f0
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/io_uring/mod.rs
@@ -0,0 +1 @@
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/libc/io_uring/syscalls.rs b/vendor/rustix/src/backend/libc/io_uring/syscalls.rs
new file mode 100644
index 0000000..8e81824
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/io_uring/syscalls.rs
@@ -0,0 +1,70 @@
+//! libc syscalls supporting `rustix::io_uring`.
+
+use crate::backend::c;
+use crate::backend::conv::{borrowed_fd, ret_owned_fd, ret_u32};
+use crate::fd::{BorrowedFd, OwnedFd};
+use crate::io;
+use crate::io_uring::{io_uring_params, IoringEnterFlags, IoringRegisterOp};
+
+#[inline]
+pub(crate) fn io_uring_setup(entries: u32, params: &mut io_uring_params) -> io::Result<OwnedFd> {
+    syscall! {
+        fn io_uring_setup(
+            entries: u32,
+            params: *mut io_uring_params
+        ) via SYS_io_uring_setup -> c::c_int
+    }
+    unsafe { ret_owned_fd(io_uring_setup(entries, params)) }
+}
+
+#[inline]
+pub(crate) unsafe fn io_uring_register(
+    fd: BorrowedFd<'_>,
+    opcode: IoringRegisterOp,
+    arg: *const c::c_void,
+    nr_args: u32,
+) -> io::Result<u32> {
+    syscall! {
+        fn io_uring_register(
+            fd: c::c_uint,
+            opcode: c::c_uint,
+            arg: *const c::c_void,
+            nr_args: c::c_uint
+        ) via SYS_io_uring_register -> c::c_int
+    }
+    ret_u32(io_uring_register(
+        borrowed_fd(fd) as _,
+        opcode as u32,
+        arg,
+        nr_args,
+    ))
+}
+
+#[inline]
+pub(crate) unsafe fn io_uring_enter(
+    fd: BorrowedFd<'_>,
+    to_submit: u32,
+    min_complete: u32,
+    flags: IoringEnterFlags,
+    arg: *const c::c_void,
+    size: usize,
+) -> io::Result<u32> {
+    syscall! {
+        fn io_uring_enter2(
+            fd: c::c_uint,
+            to_submit: c::c_uint,
+            min_complete: c::c_uint,
+            flags: c::c_uint,
+            arg: *const c::c_void,
+            size: usize
+        ) via SYS_io_uring_enter -> c::c_int
+    }
+    ret_u32(io_uring_enter2(
+        borrowed_fd(fd) as _,
+        to_submit,
+        min_complete,
+        bitflags_bits!(flags),
+        arg,
+        size,
+    ))
+}
diff --git a/vendor/rustix/src/backend/libc/mm/mod.rs b/vendor/rustix/src/backend/libc/mm/mod.rs
new file mode 100644
index 0000000..1e0181a
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/mm/mod.rs
@@ -0,0 +1,2 @@
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/libc/mm/syscalls.rs b/vendor/rustix/src/backend/libc/mm/syscalls.rs
new file mode 100644
index 0000000..33bc9ca
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/mm/syscalls.rs
@@ -0,0 +1,244 @@
+//! libc syscalls supporting `rustix::mm`.
+
+#[cfg(not(target_os = "redox"))]
+use super::types::Advice;
+#[cfg(any(linux_kernel, freebsdlike, netbsdlike))]
+use super::types::MlockAllFlags;
+#[cfg(any(target_os = "emscripten", target_os = "linux"))]
+use super::types::MremapFlags;
+use super::types::{MapFlags, MprotectFlags, MsyncFlags, ProtFlags};
+#[cfg(linux_kernel)]
+use super::types::{MlockFlags, UserfaultfdFlags};
+use crate::backend::c;
+#[cfg(linux_kernel)]
+use crate::backend::conv::ret_owned_fd;
+use crate::backend::conv::{borrowed_fd, no_fd, ret};
+use crate::fd::BorrowedFd;
+#[cfg(linux_kernel)]
+use crate::fd::OwnedFd;
+use crate::io;
+
+#[cfg(not(target_os = "redox"))]
+pub(crate) fn madvise(addr: *mut c::c_void, len: usize, advice: Advice) -> io::Result<()> {
+    // On Linux platforms, `MADV_DONTNEED` has the same value as
+    // `POSIX_MADV_DONTNEED` but different behavior. We remap it to a different
+    // value, and check for it here.
+    #[cfg(target_os = "linux")]
+    if let Advice::LinuxDontNeed = advice {
+        return unsafe { ret(c::madvise(addr, len, c::MADV_DONTNEED)) };
+    }
+
+    #[cfg(not(target_os = "android"))]
+    {
+        let err = unsafe { c::posix_madvise(addr, len, advice as c::c_int) };
+
+        // `posix_madvise` returns its error status rather than using `errno`.
+        if err == 0 {
+            Ok(())
+        } else {
+            Err(io::Errno(err))
+        }
+    }
+
+    #[cfg(target_os = "android")]
+    {
+        if let Advice::DontNeed = advice {
+            // Do nothing. Linux's `MADV_DONTNEED` isn't the same as
+            // `POSIX_MADV_DONTNEED`, so just discard `MADV_DONTNEED`.
+            Ok(())
+        } else {
+            unsafe { ret(c::madvise(addr, len, advice as c::c_int)) }
+        }
+    }
+}
+
+pub(crate) unsafe fn msync(addr: *mut c::c_void, len: usize, flags: MsyncFlags) -> io::Result<()> {
+    let err = c::msync(addr, len, bitflags_bits!(flags));
+
+    // `msync` returns its error status rather than using `errno`.
+    if err == 0 {
+        Ok(())
+    } else {
+        Err(io::Errno(err))
+    }
+}
+
+/// # Safety
+///
+/// `mmap` is primarily unsafe due to the `addr` parameter, as anything working
+/// with memory pointed to by raw pointers is unsafe.
+pub(crate) unsafe fn mmap(
+    ptr: *mut c::c_void,
+    len: usize,
+    prot: ProtFlags,
+    flags: MapFlags,
+    fd: BorrowedFd<'_>,
+    offset: u64,
+) -> io::Result<*mut c::c_void> {
+    let res = c::mmap(
+        ptr,
+        len,
+        bitflags_bits!(prot),
+        bitflags_bits!(flags),
+        borrowed_fd(fd),
+        offset as i64,
+    );
+    if res == c::MAP_FAILED {
+        Err(io::Errno::last_os_error())
+    } else {
+        Ok(res)
+    }
+}
+
+/// # Safety
+///
+/// `mmap` is primarily unsafe due to the `addr` parameter, as anything working
+/// with memory pointed to by raw pointers is unsafe.
+pub(crate) unsafe fn mmap_anonymous(
+    ptr: *mut c::c_void,
+    len: usize,
+    prot: ProtFlags,
+    flags: MapFlags,
+) -> io::Result<*mut c::c_void> {
+    let res = c::mmap(
+        ptr,
+        len,
+        bitflags_bits!(prot),
+        bitflags_bits!(flags | MapFlags::from_bits_retain(bitcast!(c::MAP_ANONYMOUS))),
+        no_fd(),
+        0,
+    );
+    if res == c::MAP_FAILED {
+        Err(io::Errno::last_os_error())
+    } else {
+        Ok(res)
+    }
+}
+
+pub(crate) unsafe fn mprotect(
+    ptr: *mut c::c_void,
+    len: usize,
+    flags: MprotectFlags,
+) -> io::Result<()> {
+    ret(c::mprotect(ptr, len, bitflags_bits!(flags)))
+}
+
+pub(crate) unsafe fn munmap(ptr: *mut c::c_void, len: usize) -> io::Result<()> {
+    ret(c::munmap(ptr, len))
+}
+
+/// # Safety
+///
+/// `mremap` is primarily unsafe due to the `old_address` parameter, as
+/// anything working with memory pointed to by raw pointers is unsafe.
+#[cfg(any(target_os = "emscripten", target_os = "linux"))]
+pub(crate) unsafe fn mremap(
+    old_address: *mut c::c_void,
+    old_size: usize,
+    new_size: usize,
+    flags: MremapFlags,
+) -> io::Result<*mut c::c_void> {
+    let res = c::mremap(old_address, old_size, new_size, bitflags_bits!(flags));
+    if res == c::MAP_FAILED {
+        Err(io::Errno::last_os_error())
+    } else {
+        Ok(res)
+    }
+}
+
+/// # Safety
+///
+/// `mremap_fixed` is primarily unsafe due to the `old_address` and
+/// `new_address` parameters, as anything working with memory pointed to by raw
+/// pointers is unsafe.
+#[cfg(any(target_os = "emscripten", target_os = "linux"))]
+pub(crate) unsafe fn mremap_fixed(
+    old_address: *mut c::c_void,
+    old_size: usize,
+    new_size: usize,
+    flags: MremapFlags,
+    new_address: *mut c::c_void,
+) -> io::Result<*mut c::c_void> {
+    let res = c::mremap(
+        old_address,
+        old_size,
+        new_size,
+        bitflags_bits!(flags | MremapFlags::from_bits_retain(bitcast!(c::MAP_FIXED))),
+        new_address,
+    );
+    if res == c::MAP_FAILED {
+        Err(io::Errno::last_os_error())
+    } else {
+        Ok(res)
+    }
+}
+
+/// # Safety
+///
+/// `mlock` operates on raw pointers and may round out to the nearest page
+/// boundaries.
+#[inline]
+pub(crate) unsafe fn mlock(addr: *mut c::c_void, length: usize) -> io::Result<()> {
+    ret(c::mlock(addr, length))
+}
+
+/// # Safety
+///
+/// `mlock_with` operates on raw pointers and may round out to the nearest page
+/// boundaries.
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) unsafe fn mlock_with(
+    addr: *mut c::c_void,
+    length: usize,
+    flags: MlockFlags,
+) -> io::Result<()> {
+    weak_or_syscall! {
+        fn mlock2(
+            addr: *const c::c_void,
+            len: c::size_t,
+            flags: c::c_int
+        ) via SYS_mlock2 -> c::c_int
+    }
+
+    ret(mlock2(addr, length, bitflags_bits!(flags)))
+}
+
+/// # Safety
+///
+/// `munlock` operates on raw pointers and may round out to the nearest page
+/// boundaries.
+#[inline]
+pub(crate) unsafe fn munlock(addr: *mut c::c_void, length: usize) -> io::Result<()> {
+    ret(c::munlock(addr, length))
+}
+
+#[cfg(linux_kernel)]
+pub(crate) unsafe fn userfaultfd(flags: UserfaultfdFlags) -> io::Result<OwnedFd> {
+    syscall! {
+        fn userfaultfd(
+            flags: c::c_int
+        ) via SYS_userfaultfd -> c::c_int
+    }
+    ret_owned_fd(userfaultfd(bitflags_bits!(flags)))
+}
+
+/// Locks all pages mapped into the address space of the calling process.
+///
+/// This includes the pages of the code, data, and stack segment, as well as
+/// shared libraries, user space kernel data, shared memory, and memory-mapped
+/// files. All mapped pages are guaranteed to be resident in RAM when the call
+/// returns successfully; the pages are guaranteed to stay in RAM until later
+/// unlocked.
+#[inline]
+#[cfg(any(linux_kernel, freebsdlike, netbsdlike))]
+pub(crate) fn mlockall(flags: MlockAllFlags) -> io::Result<()> {
+    unsafe { ret(c::mlockall(bitflags_bits!(flags))) }
+}
+
+/// Unlocks all pages mapped into the address space of the calling process.
+#[inline]
+#[cfg(any(linux_kernel, freebsdlike, netbsdlike))]
+pub(crate) fn munlockall() -> io::Result<()> {
+    unsafe { ret(c::munlockall()) }
+}
diff --git a/vendor/rustix/src/backend/libc/mm/types.rs b/vendor/rustix/src/backend/libc/mm/types.rs
new file mode 100644
index 0000000..a4aa3e2
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/mm/types.rs
@@ -0,0 +1,477 @@
+use crate::backend::c;
+use bitflags::bitflags;
+
+bitflags! {
+    /// `PROT_*` flags for use with [`mmap`].
+    ///
+    /// For `PROT_NONE`, use `ProtFlags::empty()`.
+    ///
+    /// [`mmap`]: crate::mm::mmap
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct ProtFlags: u32 {
+        /// `PROT_READ`
+        const READ = bitcast!(c::PROT_READ);
+        /// `PROT_WRITE`
+        const WRITE = bitcast!(c::PROT_WRITE);
+        /// `PROT_EXEC`
+        const EXEC = bitcast!(c::PROT_EXEC);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `PROT_*` flags for use with [`mprotect`].
+    ///
+    /// For `PROT_NONE`, use `MprotectFlags::empty()`.
+    ///
+    /// [`mprotect`]: crate::mm::mprotect
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MprotectFlags: u32 {
+        /// `PROT_READ`
+        const READ = bitcast!(c::PROT_READ);
+        /// `PROT_WRITE`
+        const WRITE = bitcast!(c::PROT_WRITE);
+        /// `PROT_EXEC`
+        const EXEC = bitcast!(c::PROT_EXEC);
+        /// `PROT_GROWSUP`
+        #[cfg(linux_kernel)]
+        const GROWSUP = bitcast!(c::PROT_GROWSUP);
+        /// `PROT_GROWSDOWN`
+        #[cfg(linux_kernel)]
+        const GROWSDOWN = bitcast!(c::PROT_GROWSDOWN);
+        /// `PROT_SEM`
+        #[cfg(linux_kernel)]
+        const SEM = linux_raw_sys::general::PROT_SEM;
+        /// `PROT_BTI`
+        #[cfg(all(linux_kernel, target_arch = "aarch64"))]
+        const BTI = linux_raw_sys::general::PROT_BTI;
+        /// `PROT_MTE`
+        #[cfg(all(linux_kernel, target_arch = "aarch64"))]
+        const MTE = linux_raw_sys::general::PROT_MTE;
+        /// `PROT_SAO`
+        #[cfg(all(linux_kernel, any(target_arch = "powerpc", target_arch = "powerpc64")))]
+        const SAO = linux_raw_sys::general::PROT_SAO;
+        /// `PROT_ADI`
+        #[cfg(all(linux_kernel, any(target_arch = "sparc", target_arch = "sparc64")))]
+        const ADI = linux_raw_sys::general::PROT_ADI;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `MAP_*` flags for use with [`mmap`].
+    ///
+    /// For `MAP_ANONYMOUS` (aka `MAP_ANON`), see [`mmap_anonymous`].
+    ///
+    /// [`mmap`]: crate::mm::mmap
+    /// [`mmap_anonymous`]: crates::mm::mmap_anonymous
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MapFlags: u32 {
+        /// `MAP_SHARED`
+        const SHARED = bitcast!(c::MAP_SHARED);
+        /// `MAP_SHARED_VALIDATE`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            target_os = "aix",
+            target_os = "android",
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "redox",
+        )))]
+        const SHARED_VALIDATE = bitcast!(c::MAP_SHARED_VALIDATE);
+        /// `MAP_PRIVATE`
+        const PRIVATE = bitcast!(c::MAP_PRIVATE);
+        /// `MAP_DENYWRITE`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            target_os = "aix",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "redox",
+        )))]
+        const DENYWRITE = bitcast!(c::MAP_DENYWRITE);
+        /// `MAP_FIXED`
+        const FIXED = bitcast!(c::MAP_FIXED);
+        /// `MAP_FIXED_NOREPLACE`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            target_os = "aix",
+            target_os = "android",
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "redox",
+        )))]
+        const FIXED_NOREPLACE = bitcast!(c::MAP_FIXED_NOREPLACE);
+        /// `MAP_GROWSDOWN`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            target_os = "aix",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "redox",
+        )))]
+        const GROWSDOWN = bitcast!(c::MAP_GROWSDOWN);
+        /// `MAP_HUGETLB`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            target_os = "aix",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "redox",
+        )))]
+        const HUGETLB = bitcast!(c::MAP_HUGETLB);
+        /// `MAP_HUGE_2MB`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            target_os = "aix",
+            target_os = "android",
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "redox",
+        )))]
+        const HUGE_2MB = bitcast!(c::MAP_HUGE_2MB);
+        /// `MAP_HUGE_1GB`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            target_os = "aix",
+            target_os = "android",
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "redox",
+        )))]
+        const HUGE_1GB = bitcast!(c::MAP_HUGE_1GB);
+        /// `MAP_LOCKED`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            target_os = "aix",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "redox",
+        )))]
+        const LOCKED = bitcast!(c::MAP_LOCKED);
+        /// `MAP_NOCORE`
+        #[cfg(freebsdlike)]
+        const NOCORE = bitcast!(c::MAP_NOCORE);
+        /// `MAP_NORESERVE`
+        #[cfg(not(any(
+            freebsdlike,
+            target_os = "aix",
+            target_os = "nto",
+            target_os = "redox",
+        )))]
+        const NORESERVE = bitcast!(c::MAP_NORESERVE);
+        /// `MAP_NOSYNC`
+        #[cfg(freebsdlike)]
+        const NOSYNC = bitcast!(c::MAP_NOSYNC);
+        /// `MAP_POPULATE`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            target_os = "aix",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "redox",
+        )))]
+        const POPULATE = bitcast!(c::MAP_POPULATE);
+        /// `MAP_STACK`
+        #[cfg(not(any(
+            apple,
+            solarish,
+            target_os = "aix",
+            target_os = "dragonfly",
+            target_os = "haiku",
+            target_os = "netbsd",
+            target_os = "redox",
+        )))]
+        const STACK = bitcast!(c::MAP_STACK);
+        /// `MAP_PREFAULT_READ`
+        #[cfg(target_os = "freebsd")]
+        const PREFAULT_READ = bitcast!(c::MAP_PREFAULT_READ);
+        /// `MAP_SYNC`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            target_os = "aix",
+            target_os = "android",
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "redox",
+            all(
+                linux_kernel,
+                any(target_arch = "mips", target_arch = "mips32r6", target_arch = "mips64", target_arch = "mips64r6"),
+            )
+        )))]
+        const SYNC = bitcast!(c::MAP_SYNC);
+        /// `MAP_UNINITIALIZED`
+        #[cfg(any())]
+        const UNINITIALIZED = bitcast!(c::MAP_UNINITIALIZED);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(any(target_os = "emscripten", target_os = "linux"))]
+bitflags! {
+    /// `MREMAP_*` flags for use with [`mremap`].
+    ///
+    /// For `MREMAP_FIXED`, see [`mremap_fixed`].
+    ///
+    /// [`mremap`]: crate::mm::mremap
+    /// [`mremap_fixed`]: crate::mm::mremap_fixed
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MremapFlags: u32 {
+        /// `MREMAP_MAYMOVE`
+        const MAYMOVE = bitcast!(c::MREMAP_MAYMOVE);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `MS_*` flags for use with [`msync`].
+    ///
+    /// [`msync`]: crate::mm::msync
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MsyncFlags: u32 {
+        /// `MS_SYNC`—Requests an update and waits for it to complete.
+        const SYNC = bitcast!(c::MS_SYNC);
+        /// `MS_ASYNC`—Specifies that an update be scheduled, but the call
+        /// returns immediately.
+        const ASYNC = bitcast!(c::MS_ASYNC);
+        /// `MS_INVALIDATE`—Asks to invalidate other mappings of the same
+        /// file (so that they can be updated with the fresh values just
+        /// written).
+        const INVALIDATE = bitcast!(c::MS_INVALIDATE);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `MLOCK_*` flags for use with [`mlock_with`].
+    ///
+    /// [`mlock_with`]: crate::mm::mlock_with
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MlockFlags: u32 {
+        /// `MLOCK_ONFAULT`
+        const ONFAULT = bitcast!(c::MLOCK_ONFAULT);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `POSIX_MADV_*` constants for use with [`madvise`].
+///
+/// [`madvise`]: crate::mm::madvise
+#[cfg(not(target_os = "redox"))]
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[repr(u32)]
+#[non_exhaustive]
+pub enum Advice {
+    /// `POSIX_MADV_NORMAL`
+    #[cfg(not(any(target_os = "android", target_os = "haiku")))]
+    Normal = bitcast!(c::POSIX_MADV_NORMAL),
+
+    /// `POSIX_MADV_NORMAL`
+    #[cfg(any(target_os = "android", target_os = "haiku"))]
+    Normal = bitcast!(c::MADV_NORMAL),
+
+    /// `POSIX_MADV_SEQUENTIAL`
+    #[cfg(not(any(target_os = "android", target_os = "haiku")))]
+    Sequential = bitcast!(c::POSIX_MADV_SEQUENTIAL),
+
+    /// `POSIX_MADV_SEQUENTIAL`
+    #[cfg(any(target_os = "android", target_os = "haiku"))]
+    Sequential = bitcast!(c::MADV_SEQUENTIAL),
+
+    /// `POSIX_MADV_RANDOM`
+    #[cfg(not(any(target_os = "android", target_os = "haiku")))]
+    Random = bitcast!(c::POSIX_MADV_RANDOM),
+
+    /// `POSIX_MADV_RANDOM`
+    #[cfg(any(target_os = "android", target_os = "haiku"))]
+    Random = bitcast!(c::MADV_RANDOM),
+
+    /// `POSIX_MADV_WILLNEED`
+    #[cfg(not(any(target_os = "android", target_os = "haiku")))]
+    WillNeed = bitcast!(c::POSIX_MADV_WILLNEED),
+
+    /// `POSIX_MADV_WILLNEED`
+    #[cfg(any(target_os = "android", target_os = "haiku"))]
+    WillNeed = bitcast!(c::MADV_WILLNEED),
+
+    /// `POSIX_MADV_DONTNEED`
+    #[cfg(not(any(target_os = "android", target_os = "emscripten", target_os = "haiku")))]
+    DontNeed = bitcast!(c::POSIX_MADV_DONTNEED),
+
+    /// `POSIX_MADV_DONTNEED`
+    #[cfg(any(target_os = "android", target_os = "haiku"))]
+    DontNeed = bitcast!(i32::MAX - 1),
+
+    /// `MADV_DONTNEED`
+    // `MADV_DONTNEED` has the same value as `POSIX_MADV_DONTNEED`. We don't
+    // have a separate `posix_madvise` from `madvise`, so we expose a special
+    // value which we special-case.
+    #[cfg(target_os = "linux")]
+    LinuxDontNeed = bitcast!(i32::MAX),
+
+    /// `MADV_DONTNEED`
+    #[cfg(target_os = "android")]
+    LinuxDontNeed = bitcast!(c::MADV_DONTNEED),
+    /// `MADV_FREE`
+    #[cfg(linux_kernel)]
+    LinuxFree = bitcast!(c::MADV_FREE),
+    /// `MADV_REMOVE`
+    #[cfg(linux_kernel)]
+    LinuxRemove = bitcast!(c::MADV_REMOVE),
+    /// `MADV_DONTFORK`
+    #[cfg(linux_kernel)]
+    LinuxDontFork = bitcast!(c::MADV_DONTFORK),
+    /// `MADV_DOFORK`
+    #[cfg(linux_kernel)]
+    LinuxDoFork = bitcast!(c::MADV_DOFORK),
+    /// `MADV_HWPOISON`
+    #[cfg(linux_kernel)]
+    LinuxHwPoison = bitcast!(c::MADV_HWPOISON),
+    /// `MADV_SOFT_OFFLINE`
+    #[cfg(all(
+        linux_kernel,
+        not(any(
+            target_arch = "mips",
+            target_arch = "mips32r6",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        ))
+    ))]
+    LinuxSoftOffline = bitcast!(c::MADV_SOFT_OFFLINE),
+    /// `MADV_MERGEABLE`
+    #[cfg(linux_kernel)]
+    LinuxMergeable = bitcast!(c::MADV_MERGEABLE),
+    /// `MADV_UNMERGEABLE`
+    #[cfg(linux_kernel)]
+    LinuxUnmergeable = bitcast!(c::MADV_UNMERGEABLE),
+    /// `MADV_HUGEPAGE`
+    #[cfg(linux_kernel)]
+    LinuxHugepage = bitcast!(c::MADV_HUGEPAGE),
+    /// `MADV_NOHUGEPAGE`
+    #[cfg(linux_kernel)]
+    LinuxNoHugepage = bitcast!(c::MADV_NOHUGEPAGE),
+    /// `MADV_DONTDUMP` (since Linux 3.4)
+    #[cfg(linux_kernel)]
+    LinuxDontDump = bitcast!(c::MADV_DONTDUMP),
+    /// `MADV_DODUMP` (since Linux 3.4)
+    #[cfg(linux_kernel)]
+    LinuxDoDump = bitcast!(c::MADV_DODUMP),
+    /// `MADV_WIPEONFORK` (since Linux 4.14)
+    #[cfg(linux_kernel)]
+    LinuxWipeOnFork = bitcast!(c::MADV_WIPEONFORK),
+    /// `MADV_KEEPONFORK` (since Linux 4.14)
+    #[cfg(linux_kernel)]
+    LinuxKeepOnFork = bitcast!(c::MADV_KEEPONFORK),
+    /// `MADV_COLD` (since Linux 5.4)
+    #[cfg(linux_kernel)]
+    LinuxCold = bitcast!(c::MADV_COLD),
+    /// `MADV_PAGEOUT` (since Linux 5.4)
+    #[cfg(linux_kernel)]
+    LinuxPageOut = bitcast!(c::MADV_PAGEOUT),
+    /// `MADV_POPULATE_READ` (since Linux 5.14)
+    #[cfg(linux_kernel)]
+    LinuxPopulateRead = bitcast!(c::MADV_POPULATE_READ),
+    /// `MADV_POPULATE_WRITE` (since Linux 5.14)
+    #[cfg(linux_kernel)]
+    LinuxPopulateWrite = bitcast!(c::MADV_POPULATE_WRITE),
+    /// `MADV_DONTNEED_LOCKED` (since Linux 5.18)
+    #[cfg(linux_kernel)]
+    LinuxDontneedLocked = bitcast!(c::MADV_DONTNEED_LOCKED),
+}
+
+#[cfg(target_os = "emscripten")]
+#[allow(non_upper_case_globals)]
+impl Advice {
+    /// `POSIX_MADV_DONTNEED`
+    pub const DontNeed: Self = Self::Normal;
+}
+
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `O_*` flags for use with [`userfaultfd`].
+    ///
+    /// [`userfaultfd`]: crate::mm::userfaultfd
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct UserfaultfdFlags: u32 {
+        /// `O_CLOEXEC`
+        const CLOEXEC = bitcast!(c::O_CLOEXEC);
+        /// `O_NONBLOCK`
+        const NONBLOCK = bitcast!(c::O_NONBLOCK);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(any(linux_kernel, freebsdlike, netbsdlike))]
+bitflags! {
+    /// `MCL_*` flags for use with [`mlockall`].
+    ///
+    /// [`mlockall`]: crate::mm::mlockall
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MlockAllFlags: u32 {
+        /// Used together with `MCL_CURRENT`, `MCL_FUTURE`, or both. Mark all
+        /// current (with `MCL_CURRENT`) or future (with `MCL_FUTURE`) mappings
+        /// to lock pages when they are faulted in. When used with
+        /// `MCL_CURRENT`, all present pages are locked, but `mlockall` will
+        /// not fault in non-present pages. When used with `MCL_FUTURE`, all
+        /// future mappings will be marked to lock pages when they are faulted
+        /// in, but they will not be populated by the lock when the mapping is
+        /// created. `MCL_ONFAULT` must be used with either `MCL_CURRENT` or
+        /// `MCL_FUTURE` or both.
+        #[cfg(linux_kernel)]
+        const ONFAULT = bitcast!(libc::MCL_ONFAULT);
+        /// Lock all pages which will become mapped into the address space of
+        /// the process in the future. These could be, for instance, new pages
+        /// required by a growing heap and stack as well as new memory-mapped
+        /// files or shared memory regions.
+        const FUTURE = bitcast!(libc::MCL_FUTURE);
+        /// Lock all pages which are currently mapped into the address space of
+        /// the process.
+        const CURRENT = bitcast!(libc::MCL_CURRENT);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/mod.rs b/vendor/rustix/src/backend/libc/mod.rs
new file mode 100644
index 0000000..9ecb09f
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/mod.rs
@@ -0,0 +1,215 @@
+//! The libc backend.
+//!
+//! On most platforms, this uses the `libc` crate to make system calls. On
+//! Windows, this uses the Winsock API in `windows-sys`, which can be adapted
+//! to have a very `libc`-like interface.
+
+// Every FFI call requires an unsafe block, and there are a lot of FFI
+// calls. For now, set this to allow for the libc backend.
+#![allow(clippy::undocumented_unsafe_blocks)]
+// Lots of libc types vary between platforms, so we often need a `.into()` on
+// one platform where it's redundant on another.
+#![allow(clippy::useless_conversion)]
+
+mod conv;
+
+#[cfg(windows)]
+pub(crate) mod fd {
+    pub use crate::maybe_polyfill::os::windows::io::{
+        AsRawSocket, AsSocket, BorrowedSocket as BorrowedFd, FromRawSocket, IntoRawSocket,
+        OwnedSocket as OwnedFd, RawSocket as RawFd,
+    };
+    pub(crate) use windows_sys::Win32::Networking::WinSock::SOCKET as LibcFd;
+
+    /// A version of [`AsRawFd`] for use with Winsock API.
+    ///
+    /// [`AsRawFd`]: https://doc.rust-lang.org/stable/std/os/fd/trait.AsRawFd.html
+    pub trait AsRawFd {
+        /// A version of [`as_raw_fd`] for use with Winsock API.
+        ///
+        /// [`as_raw_fd`]: https://doc.rust-lang.org/stable/std/os/fd/trait.FromRawFd.html#tymethod.as_raw_fd
+        fn as_raw_fd(&self) -> RawFd;
+    }
+    impl<T: AsRawSocket> AsRawFd for T {
+        #[inline]
+        fn as_raw_fd(&self) -> RawFd {
+            self.as_raw_socket()
+        }
+    }
+
+    /// A version of [`IntoRawFd`] for use with Winsock API.
+    ///
+    /// [`IntoRawFd`]: https://doc.rust-lang.org/stable/std/os/fd/trait.IntoRawFd.html
+    pub trait IntoRawFd {
+        /// A version of [`into_raw_fd`] for use with Winsock API.
+        ///
+        /// [`into_raw_fd`]: https://doc.rust-lang.org/stable/std/os/fd/trait.FromRawFd.html#tymethod.into_raw_fd
+        fn into_raw_fd(self) -> RawFd;
+    }
+    impl<T: IntoRawSocket> IntoRawFd for T {
+        #[inline]
+        fn into_raw_fd(self) -> RawFd {
+            self.into_raw_socket()
+        }
+    }
+
+    /// A version of [`FromRawFd`] for use with Winsock API.
+    ///
+    /// [`FromRawFd`]: https://doc.rust-lang.org/stable/std/os/fd/trait.FromRawFd.html
+    pub trait FromRawFd {
+        /// A version of [`from_raw_fd`] for use with Winsock API.
+        ///
+        /// # Safety
+        ///
+        /// See the [safety requirements] for [`from_raw_fd`].
+        ///
+        /// [`from_raw_fd`]: https://doc.rust-lang.org/stable/std/os/fd/trait.FromRawFd.html#tymethod.from_raw_fd
+        /// [safety requirements]: https://doc.rust-lang.org/stable/std/os/fd/trait.FromRawFd.html#safety
+        unsafe fn from_raw_fd(raw_fd: RawFd) -> Self;
+    }
+    impl<T: FromRawSocket> FromRawFd for T {
+        #[inline]
+        unsafe fn from_raw_fd(raw_fd: RawFd) -> Self {
+            Self::from_raw_socket(raw_fd)
+        }
+    }
+
+    /// A version of [`AsFd`] for use with Winsock API.
+    ///
+    /// [`AsFd`]: https://doc.rust-lang.org/stable/std/os/fd/trait.AsFd.html
+    pub trait AsFd {
+        /// An `as_fd` function for Winsock, where a `Fd` is a `Socket`.
+        fn as_fd(&self) -> BorrowedFd;
+    }
+    impl<T: AsSocket> AsFd for T {
+        #[inline]
+        fn as_fd(&self) -> BorrowedFd {
+            self.as_socket()
+        }
+    }
+}
+#[cfg(not(windows))]
+pub(crate) mod fd {
+    pub use crate::maybe_polyfill::os::fd::{
+        AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd,
+    };
+    #[allow(unused_imports)]
+    pub(crate) use RawFd as LibcFd;
+}
+
+// On Windows we emulate selected libc-compatible interfaces. On non-Windows,
+// we just use libc here, since this is the libc backend.
+#[cfg_attr(windows, path = "winsock_c.rs")]
+pub(crate) mod c;
+
+#[cfg(feature = "event")]
+pub(crate) mod event;
+#[cfg(not(windows))]
+#[cfg(feature = "fs")]
+pub(crate) mod fs;
+pub(crate) mod io;
+#[cfg(linux_kernel)]
+#[cfg(feature = "io_uring")]
+pub(crate) mod io_uring;
+#[cfg(not(any(windows, target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+#[cfg(feature = "mm")]
+pub(crate) mod mm;
+#[cfg(linux_kernel)]
+#[cfg(feature = "mount")]
+pub(crate) mod mount;
+#[cfg(linux_kernel)]
+#[cfg(all(feature = "fs", not(feature = "mount")))]
+pub(crate) mod mount; // for deprecated mount functions in "fs"
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+#[cfg(feature = "net")]
+pub(crate) mod net;
+#[cfg(not(any(windows, target_os = "espidf")))]
+#[cfg(any(
+    feature = "param",
+    feature = "runtime",
+    feature = "time",
+    target_arch = "x86",
+))]
+pub(crate) mod param;
+#[cfg(not(windows))]
+#[cfg(feature = "pipe")]
+pub(crate) mod pipe;
+#[cfg(not(windows))]
+#[cfg(feature = "process")]
+pub(crate) mod process;
+#[cfg(not(windows))]
+#[cfg(not(target_os = "wasi"))]
+#[cfg(feature = "pty")]
+pub(crate) mod pty;
+#[cfg(not(windows))]
+#[cfg(feature = "rand")]
+pub(crate) mod rand;
+#[cfg(not(windows))]
+#[cfg(not(target_os = "wasi"))]
+#[cfg(feature = "system")]
+pub(crate) mod system;
+#[cfg(not(any(windows, target_os = "vita")))]
+#[cfg(feature = "termios")]
+pub(crate) mod termios;
+#[cfg(not(windows))]
+#[cfg(feature = "thread")]
+pub(crate) mod thread;
+#[cfg(not(any(windows, target_os = "espidf")))]
+#[cfg(feature = "time")]
+pub(crate) mod time;
+
+/// If the host libc is glibc, return `true` if it is less than version 2.25.
+///
+/// To restate and clarify, this function returning true does not mean the libc
+/// is glibc just that if it is glibc, it is less than version 2.25.
+///
+/// For now, this function is only available on Linux, but if it ends up being
+/// used beyond that, this could be changed to e.g. `#[cfg(unix)]`.
+#[cfg(all(unix, target_env = "gnu"))]
+pub(crate) fn if_glibc_is_less_than_2_25() -> bool {
+    // This is also defined inside `weak_or_syscall!` in
+    // backend/libc/rand/syscalls.rs, but it's not convenient to re-export the
+    // weak symbol from that macro, so we duplicate it at a small cost here.
+    weak! { fn getrandom(*mut c::c_void, c::size_t, c::c_uint) -> c::ssize_t }
+
+    // glibc 2.25 has `getrandom`, which is how we satisfy the API contract of
+    // this function. But, there are likely other libc versions which have it.
+    getrandom.get().is_none()
+}
+
+// Private modules used by multiple public modules.
+#[cfg(any(feature = "procfs", feature = "process", feature = "runtime"))]
+#[cfg(not(any(windows, target_os = "wasi")))]
+pub(crate) mod pid;
+#[cfg(any(feature = "process", feature = "thread"))]
+#[cfg(linux_kernel)]
+pub(crate) mod prctl;
+#[cfg(not(any(
+    windows,
+    target_os = "android",
+    target_os = "espidf",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[cfg(feature = "shm")]
+pub(crate) mod shm;
+#[cfg(any(feature = "fs", feature = "thread", feature = "process"))]
+#[cfg(not(any(windows, target_os = "wasi")))]
+pub(crate) mod ugid;
+
+#[cfg(bsd)]
+const MAX_IOV: usize = c::IOV_MAX as usize;
+
+#[cfg(any(linux_kernel, target_os = "emscripten", target_os = "nto"))]
+const MAX_IOV: usize = c::UIO_MAXIOV as usize;
+
+#[cfg(not(any(
+    bsd,
+    linux_kernel,
+    windows,
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "nto",
+    target_os = "horizon",
+)))]
+const MAX_IOV: usize = 16; // The minimum value required by POSIX.
diff --git a/vendor/rustix/src/backend/libc/mount/mod.rs b/vendor/rustix/src/backend/libc/mount/mod.rs
new file mode 100644
index 0000000..1e0181a
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/mount/mod.rs
@@ -0,0 +1,2 @@
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/libc/mount/syscalls.rs b/vendor/rustix/src/backend/libc/mount/syscalls.rs
new file mode 100644
index 0000000..7245114
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/mount/syscalls.rs
@@ -0,0 +1,272 @@
+use crate::backend::c;
+use crate::backend::conv::ret;
+#[cfg(feature = "mount")]
+use crate::backend::conv::{borrowed_fd, c_str, ret_owned_fd};
+#[cfg(feature = "mount")]
+use crate::fd::{BorrowedFd, OwnedFd};
+use crate::ffi::CStr;
+use crate::io;
+use core::ptr::null;
+
+#[cfg(linux_kernel)]
+pub(crate) fn mount(
+    source: Option<&CStr>,
+    target: &CStr,
+    file_system_type: Option<&CStr>,
+    flags: super::types::MountFlagsArg,
+    data: Option<&CStr>,
+) -> io::Result<()> {
+    unsafe {
+        ret(c::mount(
+            source.map_or_else(null, CStr::as_ptr),
+            target.as_ptr(),
+            file_system_type.map_or_else(null, CStr::as_ptr),
+            flags.0,
+            data.map_or_else(null, CStr::as_ptr).cast(),
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+pub(crate) fn unmount(target: &CStr, flags: super::types::UnmountFlags) -> io::Result<()> {
+    unsafe { ret(c::umount2(target.as_ptr(), bitflags_bits!(flags))) }
+}
+
+#[cfg(linux_kernel)]
+#[cfg(feature = "mount")]
+pub(crate) fn fsopen(fs_name: &CStr, flags: super::types::FsOpenFlags) -> io::Result<OwnedFd> {
+    syscall! {
+        fn fsopen(
+            fs_name: *const c::c_char,
+            flags: c::c_uint
+        ) via SYS_fsopen -> c::c_int
+    }
+    unsafe { ret_owned_fd(fsopen(c_str(fs_name), flags.bits())) }
+}
+
+#[cfg(linux_kernel)]
+#[cfg(feature = "mount")]
+pub(crate) fn fsmount(
+    fs_fd: BorrowedFd<'_>,
+    flags: super::types::FsMountFlags,
+    attr_flags: super::types::MountAttrFlags,
+) -> io::Result<OwnedFd> {
+    syscall! {
+        fn fsmount(
+            fs_fd: c::c_int,
+            flags: c::c_uint,
+            attr_flags: c::c_uint
+        ) via SYS_fsmount -> c::c_int
+    }
+    unsafe { ret_owned_fd(fsmount(borrowed_fd(fs_fd), flags.bits(), attr_flags.bits())) }
+}
+
+#[cfg(linux_kernel)]
+#[cfg(feature = "mount")]
+pub(crate) fn move_mount(
+    from_dfd: BorrowedFd<'_>,
+    from_pathname: &CStr,
+    to_dfd: BorrowedFd<'_>,
+    to_pathname: &CStr,
+    flags: super::types::MoveMountFlags,
+) -> io::Result<()> {
+    syscall! {
+        fn move_mount(
+            from_dfd: c::c_int,
+            from_pathname: *const c::c_char,
+            to_dfd: c::c_int,
+            to_pathname: *const c::c_char,
+            flags: c::c_uint
+        ) via SYS_move_mount -> c::c_int
+    }
+    unsafe {
+        ret(move_mount(
+            borrowed_fd(from_dfd),
+            c_str(from_pathname),
+            borrowed_fd(to_dfd),
+            c_str(to_pathname),
+            flags.bits(),
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+#[cfg(feature = "mount")]
+pub(crate) fn open_tree(
+    dfd: BorrowedFd<'_>,
+    filename: &CStr,
+    flags: super::types::OpenTreeFlags,
+) -> io::Result<OwnedFd> {
+    syscall! {
+        fn open_tree(
+            dfd: c::c_int,
+            filename: *const c::c_char,
+            flags: c::c_uint
+        ) via SYS_open_tree -> c::c_int
+    }
+
+    unsafe { ret_owned_fd(open_tree(borrowed_fd(dfd), c_str(filename), flags.bits())) }
+}
+
+#[cfg(linux_kernel)]
+#[cfg(feature = "mount")]
+pub(crate) fn fspick(
+    dfd: BorrowedFd<'_>,
+    path: &CStr,
+    flags: super::types::FsPickFlags,
+) -> io::Result<OwnedFd> {
+    syscall! {
+        fn fspick(
+            dfd: c::c_int,
+            path: *const c::c_char,
+            flags: c::c_uint
+        ) via SYS_fspick -> c::c_int
+    }
+
+    unsafe { ret_owned_fd(fspick(borrowed_fd(dfd), c_str(path), flags.bits())) }
+}
+
+#[cfg(feature = "mount")]
+#[cfg(linux_kernel)]
+syscall! {
+    fn fsconfig(
+        fs_fd: c::c_int,
+        cmd: c::c_uint,
+        key: *const c::c_char,
+        val: *const c::c_char,
+        aux: c::c_int
+    ) via SYS_fsconfig -> c::c_int
+}
+
+#[cfg(linux_kernel)]
+#[cfg(feature = "mount")]
+pub(crate) fn fsconfig_set_flag(fs_fd: BorrowedFd<'_>, key: &CStr) -> io::Result<()> {
+    unsafe {
+        ret(fsconfig(
+            borrowed_fd(fs_fd),
+            super::types::FsConfigCmd::SetFlag as _,
+            c_str(key),
+            null(),
+            0,
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+#[cfg(feature = "mount")]
+pub(crate) fn fsconfig_set_string(
+    fs_fd: BorrowedFd<'_>,
+    key: &CStr,
+    value: &CStr,
+) -> io::Result<()> {
+    unsafe {
+        ret(fsconfig(
+            borrowed_fd(fs_fd),
+            super::types::FsConfigCmd::SetString as _,
+            c_str(key),
+            c_str(value),
+            0,
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+#[cfg(feature = "mount")]
+pub(crate) fn fsconfig_set_binary(
+    fs_fd: BorrowedFd<'_>,
+    key: &CStr,
+    value: &[u8],
+) -> io::Result<()> {
+    unsafe {
+        ret(fsconfig(
+            borrowed_fd(fs_fd),
+            super::types::FsConfigCmd::SetBinary as _,
+            c_str(key),
+            value.as_ptr().cast(),
+            value.len().try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+#[cfg(feature = "mount")]
+pub(crate) fn fsconfig_set_fd(
+    fs_fd: BorrowedFd<'_>,
+    key: &CStr,
+    fd: BorrowedFd<'_>,
+) -> io::Result<()> {
+    unsafe {
+        ret(fsconfig(
+            borrowed_fd(fs_fd),
+            super::types::FsConfigCmd::SetFd as _,
+            c_str(key),
+            null(),
+            borrowed_fd(fd),
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+#[cfg(feature = "mount")]
+pub(crate) fn fsconfig_set_path(
+    fs_fd: BorrowedFd<'_>,
+    key: &CStr,
+    path: &CStr,
+    fd: BorrowedFd<'_>,
+) -> io::Result<()> {
+    unsafe {
+        ret(fsconfig(
+            borrowed_fd(fs_fd),
+            super::types::FsConfigCmd::SetPath as _,
+            c_str(key),
+            c_str(path),
+            borrowed_fd(fd),
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+#[cfg(feature = "mount")]
+pub(crate) fn fsconfig_set_path_empty(
+    fs_fd: BorrowedFd<'_>,
+    key: &CStr,
+    fd: BorrowedFd<'_>,
+) -> io::Result<()> {
+    unsafe {
+        ret(fsconfig(
+            borrowed_fd(fs_fd),
+            super::types::FsConfigCmd::SetPathEmpty as _,
+            c_str(key),
+            c_str(cstr!("")),
+            borrowed_fd(fd),
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+#[cfg(feature = "mount")]
+pub(crate) fn fsconfig_create(fs_fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe {
+        ret(fsconfig(
+            borrowed_fd(fs_fd),
+            super::types::FsConfigCmd::Create as _,
+            null(),
+            null(),
+            0,
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+#[cfg(feature = "mount")]
+pub(crate) fn fsconfig_reconfigure(fs_fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe {
+        ret(fsconfig(
+            borrowed_fd(fs_fd),
+            super::types::FsConfigCmd::Reconfigure as _,
+            null(),
+            null(),
+            0,
+        ))
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/mount/types.rs b/vendor/rustix/src/backend/libc/mount/types.rs
new file mode 100644
index 0000000..1023686
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/mount/types.rs
@@ -0,0 +1,340 @@
+use crate::backend::c;
+use bitflags::bitflags;
+
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `MS_*` constants for use with [`mount`].
+    ///
+    /// [`mount`]: crate::mount::mount
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MountFlags: c::c_ulong {
+        /// `MS_BIND`
+        const BIND = c::MS_BIND;
+
+        /// `MS_DIRSYNC`
+        const DIRSYNC = c::MS_DIRSYNC;
+
+        /// `MS_LAZYTIME`
+        const LAZYTIME = c::MS_LAZYTIME;
+
+        /// `MS_MANDLOCK`
+        #[doc(alias = "MANDLOCK")]
+        const PERMIT_MANDATORY_FILE_LOCKING = c::MS_MANDLOCK;
+
+        /// `MS_NOATIME`
+        const NOATIME = c::MS_NOATIME;
+
+        /// `MS_NODEV`
+        const NODEV = c::MS_NODEV;
+
+        /// `MS_NODIRATIME`
+        const NODIRATIME = c::MS_NODIRATIME;
+
+        /// `MS_NOEXEC`
+        const NOEXEC = c::MS_NOEXEC;
+
+        /// `MS_NOSUID`
+        const NOSUID = c::MS_NOSUID;
+
+        /// `MS_RDONLY`
+        const RDONLY = c::MS_RDONLY;
+
+        /// `MS_REC`
+        const REC = c::MS_REC;
+
+        /// `MS_RELATIME`
+        const RELATIME = c::MS_RELATIME;
+
+        /// `MS_SILENT`
+        const SILENT = c::MS_SILENT;
+
+        /// `MS_STRICTATIME`
+        const STRICTATIME = c::MS_STRICTATIME;
+
+        /// `MS_SYNCHRONOUS`
+        const SYNCHRONOUS = c::MS_SYNCHRONOUS;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `MNT_*` constants for use with [`unmount`].
+    ///
+    /// [`unmount`]: crate::mount::unmount
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct UnmountFlags: u32 {
+        /// `MNT_FORCE`
+        const FORCE = bitcast!(c::MNT_FORCE);
+        /// `MNT_DETACH`
+        const DETACH = bitcast!(c::MNT_DETACH);
+        /// `MNT_EXPIRE`
+        const EXPIRE = bitcast!(c::MNT_EXPIRE);
+        /// `UMOUNT_NOFOLLOW`
+        const NOFOLLOW = bitcast!(c::UMOUNT_NOFOLLOW);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(feature = "mount")]
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `FSOPEN_*` constants for use with [`fsopen`].
+    ///
+    /// [`fsopen`]: crate::mount::fsopen
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct FsOpenFlags: c::c_uint {
+        /// `FSOPEN_CLOEXEC`
+        const FSOPEN_CLOEXEC = 0x0000_0001;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(feature = "mount")]
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `FSMOUNT_*` constants for use with [`fsmount`].
+    ///
+    /// [`fsmount`]: crate::mount::fsmount
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct FsMountFlags: c::c_uint {
+        /// `FSMOUNT_CLOEXEC`
+        const FSMOUNT_CLOEXEC = 0x0000_0001;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `FSCONFIG_*` constants for use with the `fsconfig` syscall.
+#[cfg(feature = "mount")]
+#[cfg(linux_kernel)]
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[repr(u32)]
+pub(crate) enum FsConfigCmd {
+    /// `FSCONFIG_SET_FLAG`
+    SetFlag = 0,
+
+    /// `FSCONFIG_SET_STRING`
+    SetString = 1,
+
+    /// `FSCONFIG_SET_BINARY`
+    SetBinary = 2,
+
+    /// `FSCONFIG_SET_PATH`
+    SetPath = 3,
+
+    /// `FSCONFIG_SET_PATH_EMPTY`
+    SetPathEmpty = 4,
+
+    /// `FSCONFIG_SET_FD`
+    SetFd = 5,
+
+    /// `FSCONFIG_CMD_CREATE`
+    Create = 6,
+
+    /// `FSCONFIG_CMD_RECONFIGURE`
+    Reconfigure = 7,
+}
+
+#[cfg(feature = "mount")]
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `MOUNT_ATTR_*` constants for use with [`fsmount`].
+    ///
+    /// [`fsmount`]: crate::mount::fsmount
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MountAttrFlags: c::c_uint {
+        /// `MOUNT_ATTR_RDONLY`
+        const MOUNT_ATTR_RDONLY = 0x0000_0001;
+
+        /// `MOUNT_ATTR_NOSUID`
+        const MOUNT_ATTR_NOSUID = 0x0000_0002;
+
+        /// `MOUNT_ATTR_NODEV`
+        const MOUNT_ATTR_NODEV = 0x0000_0004;
+
+        /// `MOUNT_ATTR_NOEXEC`
+        const MOUNT_ATTR_NOEXEC = 0x0000_0008;
+
+        /// `MOUNT_ATTR__ATIME`
+        const MOUNT_ATTR__ATIME = 0x0000_0070;
+
+        /// `MOUNT_ATTR_RELATIME`
+        const MOUNT_ATTR_RELATIME = 0x0000_0000;
+
+        /// `MOUNT_ATTR_NOATIME`
+        const MOUNT_ATTR_NOATIME = 0x0000_0010;
+
+        /// `MOUNT_ATTR_STRICTATIME`
+        const MOUNT_ATTR_STRICTATIME = 0x0000_0020;
+
+        /// `MOUNT_ATTR_NODIRATIME`
+        const MOUNT_ATTR_NODIRATIME = 0x0000_0080;
+
+        /// `MOUNT_ATTR_NOUSER`
+        const MOUNT_ATTR_IDMAP = 0x0010_0000;
+
+        /// `MOUNT_ATTR__ATIME_FLAGS`
+        const MOUNT_ATTR_NOSYMFOLLOW = 0x0020_0000;
+
+        /// `MOUNT_ATTR__ATIME_FLAGS`
+        const MOUNT_ATTR_SIZE_VER0 = 32;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(feature = "mount")]
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `MOVE_MOUNT_*` constants for use with [`move_mount`].
+    ///
+    /// [`move_mount`]: crate::mount::move_mount
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MoveMountFlags: c::c_uint {
+        /// `MOVE_MOUNT_F_EMPTY_PATH`
+        const MOVE_MOUNT_F_SYMLINKS = 0x0000_0001;
+
+        /// `MOVE_MOUNT_F_AUTOMOUNTS`
+        const MOVE_MOUNT_F_AUTOMOUNTS = 0x0000_0002;
+
+        /// `MOVE_MOUNT_F_EMPTY_PATH`
+        const MOVE_MOUNT_F_EMPTY_PATH = 0x0000_0004;
+
+        /// `MOVE_MOUNT_T_SYMLINKS`
+        const MOVE_MOUNT_T_SYMLINKS = 0x0000_0010;
+
+        /// `MOVE_MOUNT_T_AUTOMOUNTS`
+        const MOVE_MOUNT_T_AUTOMOUNTS = 0x0000_0020;
+
+        /// `MOVE_MOUNT_T_EMPTY_PATH`
+        const MOVE_MOUNT_T_EMPTY_PATH = 0x0000_0040;
+
+        /// `MOVE_MOUNT__MASK`
+        const MOVE_MOUNT_SET_GROUP = 0x0000_0100;
+
+        // TODO: add when Linux 6.5 is released
+        // /// `MOVE_MOUNT_BENEATH`
+        // const MOVE_MOUNT_BENEATH = 0x0000_0200;
+
+        /// `MOVE_MOUNT__MASK`
+        const MOVE_MOUNT__MASK = 0x0000_0377;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(feature = "mount")]
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `OPENTREE_*` constants for use with [`open_tree`].
+    ///
+    /// [`open_tree`]: crate::mount::open_tree
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct OpenTreeFlags: c::c_uint {
+        /// `OPENTREE_CLONE`
+        const OPEN_TREE_CLONE = 1;
+
+        /// `OPENTREE_CLOEXEC`
+        const OPEN_TREE_CLOEXEC = c::O_CLOEXEC as c::c_uint;
+
+        /// `AT_EMPTY_PATH`
+        const AT_EMPTY_PATH = c::AT_EMPTY_PATH as c::c_uint;
+
+        /// `AT_NO_AUTOMOUNT`
+        const AT_NO_AUTOMOUNT = c::AT_NO_AUTOMOUNT as c::c_uint;
+
+        /// `AT_RECURSIVE`
+        const AT_RECURSIVE = c::AT_RECURSIVE as c::c_uint;
+
+        /// `AT_SYMLINK_NOFOLLOW`
+        const AT_SYMLINK_NOFOLLOW = c::AT_SYMLINK_NOFOLLOW as c::c_uint;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(feature = "mount")]
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `FSPICK_*` constants for use with [`fspick`].
+    ///
+    /// [`fspick`]: crate::mount::fspick
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct FsPickFlags: c::c_uint {
+        /// `FSPICK_CLOEXEC`
+        const FSPICK_CLOEXEC = 0x0000_0001;
+
+        /// `FSPICK_SYMLINK_NOFOLLOW`
+        const FSPICK_SYMLINK_NOFOLLOW = 0x0000_0002;
+
+        /// `FSPICK_NO_AUTOMOUNT`
+        const FSPICK_NO_AUTOMOUNT = 0x0000_0004;
+
+        /// `FSPICK_EMPTY_PATH`
+        const FSPICK_EMPTY_PATH = 0x0000_0008;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `MS_*` constants for use with [`mount_change`].
+    ///
+    /// [`mount_change`]: crate::mount::mount_change
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MountPropagationFlags: c::c_ulong {
+        /// `MS_SILENT`
+        const SILENT = c::MS_SILENT;
+        /// `MS_SHARED`
+        const SHARED = c::MS_SHARED;
+        /// `MS_PRIVATE`
+        const PRIVATE = c::MS_PRIVATE;
+        /// `MS_SLAVE`
+        const SLAVE = c::MS_SLAVE;
+        /// `MS_UNBINDABLE`
+        const UNBINDABLE = c::MS_UNBINDABLE;
+        /// `MS_REC`
+        const REC = c::MS_REC;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(linux_kernel)]
+bitflags! {
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub(crate) struct InternalMountFlags: c::c_ulong {
+        const REMOUNT = c::MS_REMOUNT;
+        const MOVE = c::MS_MOVE;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(linux_kernel)]
+pub(crate) struct MountFlagsArg(pub(crate) c::c_ulong);
diff --git a/vendor/rustix/src/backend/libc/net/addr.rs b/vendor/rustix/src/backend/libc/net/addr.rs
new file mode 100644
index 0000000..719a549
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/addr.rs
@@ -0,0 +1,245 @@
+//! Socket address utilities.
+
+use crate::backend::c;
+#[cfg(unix)]
+use {
+    crate::ffi::CStr,
+    crate::io,
+    crate::path,
+    core::cmp::Ordering,
+    core::fmt,
+    core::hash::{Hash, Hasher},
+    core::slice,
+};
+
+/// `struct sockaddr_un`
+#[cfg(unix)]
+#[derive(Clone)]
+#[doc(alias = "sockaddr_un")]
+pub struct SocketAddrUnix {
+    pub(crate) unix: c::sockaddr_un,
+    #[cfg(not(any(bsd, target_os = "haiku")))]
+    len: c::socklen_t,
+}
+
+#[cfg(unix)]
+impl SocketAddrUnix {
+    /// Construct a new Unix-domain address from a filesystem path.
+    #[inline]
+    pub fn new<P: path::Arg>(path: P) -> io::Result<Self> {
+        path.into_with_c_str(Self::_new)
+    }
+
+    #[inline]
+    fn _new(path: &CStr) -> io::Result<Self> {
+        let mut unix = Self::init();
+        let bytes = path.to_bytes_with_nul();
+        if bytes.len() > unix.sun_path.len() {
+            return Err(io::Errno::NAMETOOLONG);
+        }
+        for (i, b) in bytes.iter().enumerate() {
+            unix.sun_path[i] = *b as c::c_char;
+        }
+
+        #[cfg(any(bsd, target_os = "haiku"))]
+        {
+            unix.sun_len = (offsetof_sun_path() + bytes.len()).try_into().unwrap();
+        }
+
+        Ok(Self {
+            unix,
+            #[cfg(not(any(bsd, target_os = "haiku")))]
+            len: (offsetof_sun_path() + bytes.len()).try_into().unwrap(),
+        })
+    }
+
+    /// Construct a new abstract Unix-domain address from a byte slice.
+    #[cfg(linux_kernel)]
+    #[inline]
+    pub fn new_abstract_name(name: &[u8]) -> io::Result<Self> {
+        let mut unix = Self::init();
+        if 1 + name.len() > unix.sun_path.len() {
+            return Err(io::Errno::NAMETOOLONG);
+        }
+        unix.sun_path[0] = 0;
+        for (i, b) in name.iter().enumerate() {
+            unix.sun_path[1 + i] = *b as c::c_char;
+        }
+        let len = offsetof_sun_path() + 1 + name.len();
+        let len = len.try_into().unwrap();
+        Ok(Self {
+            unix,
+            #[cfg(not(any(bsd, target_os = "haiku")))]
+            len,
+        })
+    }
+
+    fn init() -> c::sockaddr_un {
+        c::sockaddr_un {
+            #[cfg(any(bsd, target_os = "aix", target_os = "haiku", target_os = "nto"))]
+            sun_len: 0,
+            #[cfg(target_os = "vita")]
+            ss_len: 0,
+            sun_family: c::AF_UNIX as _,
+            #[cfg(any(bsd, target_os = "nto"))]
+            sun_path: [0; 104],
+            #[cfg(not(any(bsd, target_os = "aix", target_os = "haiku", target_os = "nto")))]
+            sun_path: [0; 108],
+            #[cfg(target_os = "haiku")]
+            sun_path: [0; 126],
+            #[cfg(target_os = "aix")]
+            sun_path: [0; 1023],
+        }
+    }
+
+    /// For a filesystem path address, return the path.
+    #[inline]
+    pub fn path(&self) -> Option<&CStr> {
+        let len = self.len();
+        if len != 0 && self.unix.sun_path[0] != 0 {
+            let end = len as usize - offsetof_sun_path();
+            let bytes = &self.unix.sun_path[..end];
+            // SAFETY: `from_raw_parts` to convert from `&[c_char]` to `&[u8]`.
+            // And `from_bytes_with_nul_unchecked` since the string is
+            // NUL-terminated.
+            unsafe {
+                Some(CStr::from_bytes_with_nul_unchecked(slice::from_raw_parts(
+                    bytes.as_ptr().cast(),
+                    bytes.len(),
+                )))
+            }
+        } else {
+            None
+        }
+    }
+
+    /// For an abstract address, return the identifier.
+    #[cfg(linux_kernel)]
+    #[inline]
+    pub fn abstract_name(&self) -> Option<&[u8]> {
+        let len = self.len();
+        if len != 0 && self.unix.sun_path[0] == 0 {
+            let end = len as usize - offsetof_sun_path();
+            let bytes = &self.unix.sun_path[1..end];
+            // SAFETY: `from_raw_parts` to convert from `&[c_char]` to `&[u8]`.
+            unsafe { Some(slice::from_raw_parts(bytes.as_ptr().cast(), bytes.len())) }
+        } else {
+            None
+        }
+    }
+
+    #[inline]
+    pub(crate) fn addr_len(&self) -> c::socklen_t {
+        #[cfg(not(any(bsd, target_os = "haiku")))]
+        {
+            self.len
+        }
+        #[cfg(any(bsd, target_os = "haiku"))]
+        {
+            c::socklen_t::from(self.unix.sun_len)
+        }
+    }
+
+    #[inline]
+    pub(crate) fn len(&self) -> usize {
+        self.addr_len() as usize
+    }
+}
+
+#[cfg(unix)]
+impl PartialEq for SocketAddrUnix {
+    #[inline]
+    fn eq(&self, other: &Self) -> bool {
+        let self_len = self.len() - offsetof_sun_path();
+        let other_len = other.len() - offsetof_sun_path();
+        self.unix.sun_path[..self_len].eq(&other.unix.sun_path[..other_len])
+    }
+}
+
+#[cfg(unix)]
+impl Eq for SocketAddrUnix {}
+
+#[cfg(unix)]
+impl PartialOrd for SocketAddrUnix {
+    #[inline]
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+#[cfg(unix)]
+impl Ord for SocketAddrUnix {
+    #[inline]
+    fn cmp(&self, other: &Self) -> Ordering {
+        let self_len = self.len() - offsetof_sun_path();
+        let other_len = other.len() - offsetof_sun_path();
+        self.unix.sun_path[..self_len].cmp(&other.unix.sun_path[..other_len])
+    }
+}
+
+#[cfg(unix)]
+impl Hash for SocketAddrUnix {
+    #[inline]
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        let self_len = self.len() - offsetof_sun_path();
+        self.unix.sun_path[..self_len].hash(state)
+    }
+}
+
+#[cfg(unix)]
+impl fmt::Debug for SocketAddrUnix {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        if let Some(path) = self.path() {
+            path.fmt(fmt)
+        } else {
+            #[cfg(linux_kernel)]
+            if let Some(name) = self.abstract_name() {
+                return name.fmt(fmt);
+            }
+
+            "(unnamed)".fmt(fmt)
+        }
+    }
+}
+
+/// `struct sockaddr_storage` as a raw struct.
+pub type SocketAddrStorage = c::sockaddr_storage;
+
+/// Return the offset of the `sun_path` field of `sockaddr_un`.
+#[cfg(not(windows))]
+#[inline]
+pub(crate) fn offsetof_sun_path() -> usize {
+    let z = c::sockaddr_un {
+        #[cfg(any(bsd, target_os = "aix", target_os = "haiku", target_os = "nto"))]
+        sun_len: 0_u8,
+        #[cfg(target_os = "vita")]
+        ss_len: 0,
+        #[cfg(any(
+            bsd,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "vita"
+        ))]
+        sun_family: 0_u8,
+        #[cfg(not(any(
+            bsd,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "vita"
+        )))]
+        sun_family: 0_u16,
+        #[cfg(any(bsd, target_os = "nto"))]
+        sun_path: [0; 104],
+        #[cfg(not(any(bsd, target_os = "aix", target_os = "haiku", target_os = "nto")))]
+        sun_path: [0; 108],
+        #[cfg(target_os = "haiku")]
+        sun_path: [0; 126],
+        #[cfg(target_os = "aix")]
+        sun_path: [0; 1023],
+    };
+    (crate::utils::as_ptr(&z.sun_path) as usize) - (crate::utils::as_ptr(&z) as usize)
+}
diff --git a/vendor/rustix/src/backend/libc/net/ext.rs b/vendor/rustix/src/backend/libc/net/ext.rs
new file mode 100644
index 0000000..2e11c05
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/ext.rs
@@ -0,0 +1,135 @@
+use crate::backend::c;
+
+/// The windows `sockaddr_in6` type is a union with accessor functions which
+/// are not `const fn`. Define our own layout-compatible version so that we
+/// can transmute in and out of it.
+#[cfg(windows)]
+#[repr(C)]
+struct sockaddr_in6 {
+    sin6_family: u16,
+    sin6_port: u16,
+    sin6_flowinfo: u32,
+    sin6_addr: c::in6_addr,
+    sin6_scope_id: u32,
+}
+
+#[cfg(not(windows))]
+#[inline]
+pub(crate) const fn in_addr_s_addr(addr: c::in_addr) -> u32 {
+    addr.s_addr
+}
+
+#[cfg(windows)]
+#[inline]
+pub(crate) const fn in_addr_s_addr(addr: c::in_addr) -> u32 {
+    // This should be `*addr.S_un.S_addr()`, except that isn't a `const fn`.
+    unsafe { core::mem::transmute(addr) }
+}
+
+#[cfg(not(windows))]
+#[inline]
+pub(crate) const fn in_addr_new(s_addr: u32) -> c::in_addr {
+    c::in_addr { s_addr }
+}
+
+#[cfg(windows)]
+#[inline]
+pub(crate) const fn in_addr_new(s_addr: u32) -> c::in_addr {
+    unsafe { core::mem::transmute(s_addr) }
+}
+
+#[cfg(not(windows))]
+#[inline]
+pub(crate) const fn in6_addr_s6_addr(addr: c::in6_addr) -> [u8; 16] {
+    addr.s6_addr
+}
+
+#[cfg(windows)]
+#[inline]
+pub(crate) const fn in6_addr_s6_addr(addr: c::in6_addr) -> [u8; 16] {
+    unsafe { core::mem::transmute(addr) }
+}
+
+#[cfg(not(windows))]
+#[inline]
+pub(crate) const fn in6_addr_new(s6_addr: [u8; 16]) -> c::in6_addr {
+    c::in6_addr { s6_addr }
+}
+
+#[cfg(windows)]
+#[inline]
+pub(crate) const fn in6_addr_new(s6_addr: [u8; 16]) -> c::in6_addr {
+    unsafe { core::mem::transmute(s6_addr) }
+}
+
+#[cfg(not(windows))]
+#[inline]
+pub(crate) const fn sockaddr_in6_sin6_scope_id(addr: &c::sockaddr_in6) -> u32 {
+    addr.sin6_scope_id
+}
+
+#[cfg(windows)]
+#[inline]
+pub(crate) const fn sockaddr_in6_sin6_scope_id(addr: &c::sockaddr_in6) -> u32 {
+    let addr: &sockaddr_in6 = unsafe { core::mem::transmute(addr) };
+    addr.sin6_scope_id
+}
+
+#[cfg(not(windows))]
+#[inline]
+pub(crate) const fn sockaddr_in6_new(
+    #[cfg(any(
+        bsd,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita"
+    ))]
+    sin6_len: u8,
+    sin6_family: c::sa_family_t,
+    sin6_port: u16,
+    sin6_flowinfo: u32,
+    sin6_addr: c::in6_addr,
+    sin6_scope_id: u32,
+) -> c::sockaddr_in6 {
+    c::sockaddr_in6 {
+        #[cfg(any(
+            bsd,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "vita"
+        ))]
+        sin6_len,
+        sin6_family,
+        sin6_port,
+        sin6_flowinfo,
+        sin6_addr,
+        sin6_scope_id,
+        #[cfg(solarish)]
+        __sin6_src_id: 0,
+        #[cfg(target_os = "vita")]
+        sin6_vport: 0,
+    }
+}
+
+#[cfg(windows)]
+#[inline]
+pub(crate) const fn sockaddr_in6_new(
+    sin6_family: u16,
+    sin6_port: u16,
+    sin6_flowinfo: u32,
+    sin6_addr: c::in6_addr,
+    sin6_scope_id: u32,
+) -> c::sockaddr_in6 {
+    let addr = sockaddr_in6 {
+        sin6_family,
+        sin6_port,
+        sin6_flowinfo,
+        sin6_addr,
+        sin6_scope_id,
+    };
+    unsafe { core::mem::transmute(addr) }
+}
diff --git a/vendor/rustix/src/backend/libc/net/mod.rs b/vendor/rustix/src/backend/libc/net/mod.rs
new file mode 100644
index 0000000..d7ab68d
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/mod.rs
@@ -0,0 +1,16 @@
+pub(crate) mod addr;
+pub(crate) mod ext;
+#[cfg(not(any(
+    windows,
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+pub(crate) mod msghdr;
+pub(crate) mod read_sockaddr;
+pub(crate) mod send_recv;
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) mod sockopt;
+pub(crate) mod syscalls;
+pub(crate) mod write_sockaddr;
diff --git a/vendor/rustix/src/backend/libc/net/msghdr.rs b/vendor/rustix/src/backend/libc/net/msghdr.rs
new file mode 100644
index 0000000..dd9b156
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/msghdr.rs
@@ -0,0 +1,134 @@
+//! Utilities for dealing with message headers.
+//!
+//! These take closures rather than returning a `c::msghdr` directly because
+//! the message headers may reference stack-local data.
+
+use crate::backend::c;
+use crate::backend::conv::{msg_control_len, msg_iov_len};
+use crate::backend::net::write_sockaddr::{encode_sockaddr_v4, encode_sockaddr_v6};
+
+use crate::io::{self, IoSlice, IoSliceMut};
+use crate::net::{RecvAncillaryBuffer, SendAncillaryBuffer, SocketAddrV4, SocketAddrV6};
+use crate::utils::as_ptr;
+
+use core::mem::{size_of, zeroed, MaybeUninit};
+
+/// Create a message header intended to receive a datagram.
+pub(crate) fn with_recv_msghdr<R>(
+    name: &mut MaybeUninit<c::sockaddr_storage>,
+    iov: &mut [IoSliceMut<'_>],
+    control: &mut RecvAncillaryBuffer<'_>,
+    f: impl FnOnce(&mut c::msghdr) -> io::Result<R>,
+) -> io::Result<R> {
+    control.clear();
+
+    let namelen = size_of::<c::sockaddr_storage>() as c::socklen_t;
+    let mut msghdr = {
+        let mut h = zero_msghdr();
+        h.msg_name = name.as_mut_ptr().cast();
+        h.msg_namelen = namelen;
+        h.msg_iov = iov.as_mut_ptr().cast();
+        h.msg_iovlen = msg_iov_len(iov.len());
+        h.msg_control = control.as_control_ptr().cast();
+        h.msg_controllen = msg_control_len(control.control_len());
+        h
+    };
+
+    let res = f(&mut msghdr);
+
+    // Reset the control length.
+    if res.is_ok() {
+        unsafe {
+            control.set_control_len(msghdr.msg_controllen.try_into().unwrap_or(usize::MAX));
+        }
+    }
+
+    res
+}
+
+/// Create a message header intended to send without an address.
+pub(crate) fn with_noaddr_msghdr<R>(
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    f: impl FnOnce(c::msghdr) -> R,
+) -> R {
+    f({
+        let mut h = zero_msghdr();
+        h.msg_iov = iov.as_ptr() as _;
+        h.msg_iovlen = msg_iov_len(iov.len());
+        h.msg_control = control.as_control_ptr().cast();
+        h.msg_controllen = msg_control_len(control.control_len());
+        h
+    })
+}
+
+/// Create a message header intended to send with an IPv4 address.
+pub(crate) fn with_v4_msghdr<R>(
+    addr: &SocketAddrV4,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    f: impl FnOnce(c::msghdr) -> R,
+) -> R {
+    let encoded = encode_sockaddr_v4(addr);
+
+    f({
+        let mut h = zero_msghdr();
+        h.msg_name = as_ptr(&encoded) as _;
+        h.msg_namelen = size_of::<SocketAddrV4>() as _;
+        h.msg_iov = iov.as_ptr() as _;
+        h.msg_iovlen = msg_iov_len(iov.len());
+        h.msg_control = control.as_control_ptr().cast();
+        h.msg_controllen = msg_control_len(control.control_len());
+        h
+    })
+}
+
+/// Create a message header intended to send with an IPv6 address.
+pub(crate) fn with_v6_msghdr<R>(
+    addr: &SocketAddrV6,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    f: impl FnOnce(c::msghdr) -> R,
+) -> R {
+    let encoded = encode_sockaddr_v6(addr);
+
+    f({
+        let mut h = zero_msghdr();
+        h.msg_name = as_ptr(&encoded) as _;
+        h.msg_namelen = size_of::<SocketAddrV6>() as _;
+        h.msg_iov = iov.as_ptr() as _;
+        h.msg_iovlen = msg_iov_len(iov.len());
+        h.msg_control = control.as_control_ptr().cast();
+        h.msg_controllen = msg_control_len(control.control_len());
+        h
+    })
+}
+
+/// Create a message header intended to send with a Unix address.
+#[cfg(all(unix, not(target_os = "redox")))]
+pub(crate) fn with_unix_msghdr<R>(
+    addr: &crate::net::SocketAddrUnix,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    f: impl FnOnce(c::msghdr) -> R,
+) -> R {
+    f({
+        let mut h = zero_msghdr();
+        h.msg_name = as_ptr(&addr.unix) as _;
+        h.msg_namelen = addr.addr_len();
+        h.msg_iov = iov.as_ptr() as _;
+        h.msg_iovlen = msg_iov_len(iov.len());
+        h.msg_control = control.as_control_ptr().cast();
+        h.msg_controllen = msg_control_len(control.control_len());
+        h
+    })
+}
+
+/// Create a zero-initialized message header struct value.
+#[cfg(all(unix, not(target_os = "redox")))]
+pub(crate) fn zero_msghdr() -> c::msghdr {
+    // SAFETY: We can't initialize all the fields by value because on some
+    // platforms the `msghdr` struct in the libc crate contains private padding
+    // fields. But it is still a C type that's meant to be zero-initializable.
+    unsafe { zeroed() }
+}
diff --git a/vendor/rustix/src/backend/libc/net/read_sockaddr.rs b/vendor/rustix/src/backend/libc/net/read_sockaddr.rs
new file mode 100644
index 0000000..6da7a50
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/read_sockaddr.rs
@@ -0,0 +1,306 @@
+//! The BSD sockets API requires us to read the `ss_family` field before we can
+//! interpret the rest of a `sockaddr` produced by the kernel.
+
+#[cfg(unix)]
+use super::addr::SocketAddrUnix;
+use super::ext::{in6_addr_s6_addr, in_addr_s_addr, sockaddr_in6_sin6_scope_id};
+use crate::backend::c;
+#[cfg(not(windows))]
+use crate::ffi::CStr;
+use crate::io;
+use crate::net::{Ipv4Addr, Ipv6Addr, SocketAddrAny, SocketAddrV4, SocketAddrV6};
+use core::mem::size_of;
+
+// This must match the header of `sockaddr`.
+#[repr(C)]
+struct sockaddr_header {
+    #[cfg(any(
+        bsd,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita"
+    ))]
+    sa_len: u8,
+    #[cfg(any(
+        bsd,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita"
+    ))]
+    ss_family: u8,
+    #[cfg(not(any(
+        bsd,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita"
+    )))]
+    ss_family: u16,
+}
+
+/// Read the `ss_family` field from a socket address returned from the OS.
+///
+/// # Safety
+///
+/// `storage` must point to a valid socket address returned from the OS.
+#[inline]
+unsafe fn read_ss_family(storage: *const c::sockaddr_storage) -> u16 {
+    // Assert that we know the layout of `sockaddr`.
+    let _ = c::sockaddr {
+        #[cfg(any(
+            bsd,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "vita"
+        ))]
+        sa_len: 0_u8,
+        #[cfg(any(
+            bsd,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "vita"
+        ))]
+        sa_family: 0_u8,
+        #[cfg(not(any(
+            bsd,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "vita"
+        )))]
+        sa_family: 0_u16,
+        #[cfg(not(target_os = "haiku"))]
+        sa_data: [0; 14],
+        #[cfg(target_os = "haiku")]
+        sa_data: [0; 30],
+    };
+
+    (*storage.cast::<sockaddr_header>()).ss_family.into()
+}
+
+/// Set the `ss_family` field of a socket address to `AF_UNSPEC`, so that we
+/// can test for `AF_UNSPEC` to test whether it was stored to.
+pub(crate) unsafe fn initialize_family_to_unspec(storage: *mut c::sockaddr_storage) {
+    (*storage.cast::<sockaddr_header>()).ss_family = c::AF_UNSPEC as _;
+}
+
+/// Read a socket address encoded in a platform-specific format.
+///
+/// # Safety
+///
+/// `storage` must point to valid socket address storage.
+pub(crate) unsafe fn read_sockaddr(
+    storage: *const c::sockaddr_storage,
+    len: usize,
+) -> io::Result<SocketAddrAny> {
+    #[cfg(unix)]
+    let offsetof_sun_path = super::addr::offsetof_sun_path();
+
+    if len < size_of::<c::sa_family_t>() {
+        return Err(io::Errno::INVAL);
+    }
+    match read_ss_family(storage).into() {
+        c::AF_INET => {
+            if len < size_of::<c::sockaddr_in>() {
+                return Err(io::Errno::INVAL);
+            }
+            let decode = &*storage.cast::<c::sockaddr_in>();
+            Ok(SocketAddrAny::V4(SocketAddrV4::new(
+                Ipv4Addr::from(u32::from_be(in_addr_s_addr(decode.sin_addr))),
+                u16::from_be(decode.sin_port),
+            )))
+        }
+        c::AF_INET6 => {
+            if len < size_of::<c::sockaddr_in6>() {
+                return Err(io::Errno::INVAL);
+            }
+            let decode = &*storage.cast::<c::sockaddr_in6>();
+            #[cfg(not(windows))]
+            let s6_addr = decode.sin6_addr.s6_addr;
+            #[cfg(windows)]
+            let s6_addr = decode.sin6_addr.u.Byte;
+            #[cfg(not(windows))]
+            let sin6_scope_id = decode.sin6_scope_id;
+            #[cfg(windows)]
+            let sin6_scope_id = decode.Anonymous.sin6_scope_id;
+            Ok(SocketAddrAny::V6(SocketAddrV6::new(
+                Ipv6Addr::from(s6_addr),
+                u16::from_be(decode.sin6_port),
+                u32::from_be(decode.sin6_flowinfo),
+                sin6_scope_id,
+            )))
+        }
+        #[cfg(unix)]
+        c::AF_UNIX => {
+            if len < offsetof_sun_path {
+                return Err(io::Errno::INVAL);
+            }
+            if len == offsetof_sun_path {
+                SocketAddrUnix::new(&[][..]).map(SocketAddrAny::Unix)
+            } else {
+                let decode = &*storage.cast::<c::sockaddr_un>();
+
+                // On Linux check for Linux's [abstract namespace].
+                //
+                // [abstract namespace]: https://man7.org/linux/man-pages/man7/unix.7.html
+                #[cfg(linux_kernel)]
+                if decode.sun_path[0] == 0 {
+                    return SocketAddrUnix::new_abstract_name(core::mem::transmute::<
+                        &[c::c_char],
+                        &[u8],
+                    >(
+                        &decode.sun_path[1..len - offsetof_sun_path],
+                    ))
+                    .map(SocketAddrAny::Unix);
+                }
+
+                // Otherwise we expect a NUL-terminated filesystem path.
+
+                // Trim off unused bytes from the end of `path_bytes`.
+                let path_bytes = if cfg!(any(solarish, target_os = "freebsd")) {
+                    // FreeBSD and illumos sometimes set the length to longer
+                    // than the length of the NUL-terminated string. Find the
+                    // NUL and truncate the string accordingly.
+                    &decode.sun_path[..decode
+                        .sun_path
+                        .iter()
+                        .position(|b| *b == 0)
+                        .ok_or(io::Errno::INVAL)?]
+                } else {
+                    // Otherwise, use the provided length.
+                    let provided_len = len - 1 - offsetof_sun_path;
+                    if decode.sun_path[provided_len] != 0 {
+                        return Err(io::Errno::INVAL);
+                    }
+                    debug_assert_eq!(
+                        CStr::from_ptr(decode.sun_path.as_ptr()).to_bytes().len(),
+                        provided_len
+                    );
+                    &decode.sun_path[..provided_len]
+                };
+
+                SocketAddrUnix::new(core::mem::transmute::<&[c::c_char], &[u8]>(path_bytes))
+                    .map(SocketAddrAny::Unix)
+            }
+        }
+        _ => Err(io::Errno::INVAL),
+    }
+}
+
+/// Read an optional socket address returned from the OS.
+///
+/// # Safety
+///
+/// `storage` must point to a valid socket address returned from the OS.
+pub(crate) unsafe fn maybe_read_sockaddr_os(
+    storage: *const c::sockaddr_storage,
+    len: usize,
+) -> Option<SocketAddrAny> {
+    if len == 0 {
+        return None;
+    }
+
+    assert!(len >= size_of::<c::sa_family_t>());
+    let family = read_ss_family(storage).into();
+    if family == c::AF_UNSPEC {
+        None
+    } else {
+        Some(inner_read_sockaddr_os(family, storage, len))
+    }
+}
+
+/// Read a socket address returned from the OS.
+///
+/// # Safety
+///
+/// `storage` must point to a valid socket address returned from the OS.
+pub(crate) unsafe fn read_sockaddr_os(
+    storage: *const c::sockaddr_storage,
+    len: usize,
+) -> SocketAddrAny {
+    assert!(len >= size_of::<c::sa_family_t>());
+    let family = read_ss_family(storage).into();
+    inner_read_sockaddr_os(family, storage, len)
+}
+
+unsafe fn inner_read_sockaddr_os(
+    family: c::c_int,
+    storage: *const c::sockaddr_storage,
+    len: usize,
+) -> SocketAddrAny {
+    #[cfg(unix)]
+    let offsetof_sun_path = super::addr::offsetof_sun_path();
+
+    assert!(len >= size_of::<c::sa_family_t>());
+    match family {
+        c::AF_INET => {
+            assert!(len >= size_of::<c::sockaddr_in>());
+            let decode = &*storage.cast::<c::sockaddr_in>();
+            SocketAddrAny::V4(SocketAddrV4::new(
+                Ipv4Addr::from(u32::from_be(in_addr_s_addr(decode.sin_addr))),
+                u16::from_be(decode.sin_port),
+            ))
+        }
+        c::AF_INET6 => {
+            assert!(len >= size_of::<c::sockaddr_in6>());
+            let decode = &*storage.cast::<c::sockaddr_in6>();
+            SocketAddrAny::V6(SocketAddrV6::new(
+                Ipv6Addr::from(in6_addr_s6_addr(decode.sin6_addr)),
+                u16::from_be(decode.sin6_port),
+                u32::from_be(decode.sin6_flowinfo),
+                sockaddr_in6_sin6_scope_id(decode),
+            ))
+        }
+        #[cfg(unix)]
+        c::AF_UNIX => {
+            assert!(len >= offsetof_sun_path);
+            if len == offsetof_sun_path {
+                SocketAddrAny::Unix(SocketAddrUnix::new(&[][..]).unwrap())
+            } else {
+                let decode = &*storage.cast::<c::sockaddr_un>();
+
+                // On Linux check for Linux's [abstract namespace].
+                //
+                // [abstract namespace]: https://man7.org/linux/man-pages/man7/unix.7.html
+                #[cfg(linux_kernel)]
+                if decode.sun_path[0] == 0 {
+                    return SocketAddrAny::Unix(
+                        SocketAddrUnix::new_abstract_name(core::mem::transmute::<
+                            &[c::c_char],
+                            &[u8],
+                        >(
+                            &decode.sun_path[1..len - offsetof_sun_path],
+                        ))
+                        .unwrap(),
+                    );
+                }
+
+                // Otherwise we expect a NUL-terminated filesystem path.
+                assert_eq!(decode.sun_path[len - 1 - offsetof_sun_path], 0);
+                let path_bytes = &decode.sun_path[..len - 1 - offsetof_sun_path];
+
+                // FreeBSD and illumos sometimes set the length to longer than
+                // the length of the NUL-terminated string. Find the NUL and
+                // truncate the string accordingly.
+                #[cfg(any(solarish, target_os = "freebsd"))]
+                let path_bytes = &path_bytes[..path_bytes.iter().position(|b| *b == 0).unwrap()];
+
+                SocketAddrAny::Unix(
+                    SocketAddrUnix::new(core::mem::transmute::<&[c::c_char], &[u8]>(path_bytes))
+                        .unwrap(),
+                )
+            }
+        }
+        other => unimplemented!("{:?}", other),
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/net/send_recv.rs b/vendor/rustix/src/backend/libc/net/send_recv.rs
new file mode 100644
index 0000000..5dc60dd
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/send_recv.rs
@@ -0,0 +1,103 @@
+use crate::backend::c;
+use bitflags::bitflags;
+
+bitflags! {
+    /// `MSG_*` flags for use with [`send`], [`send_to`], and related
+    /// functions.
+    ///
+    /// [`send`]: crate::net::send
+    /// [`sendto`]: crate::net::sendto
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct SendFlags: u32 {
+        /// `MSG_CONFIRM`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            windows,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "nto",
+            target_os = "haiku",
+            target_os = "vita",
+        )))]
+        const CONFIRM = bitcast!(c::MSG_CONFIRM);
+        /// `MSG_DONTROUTE`
+        const DONTROUTE = bitcast!(c::MSG_DONTROUTE);
+        /// `MSG_DONTWAIT`
+        #[cfg(not(windows))]
+        const DONTWAIT = bitcast!(c::MSG_DONTWAIT);
+        /// `MSG_EOR`
+        #[cfg(not(windows))]
+        const EOT = bitcast!(c::MSG_EOR);
+        /// `MSG_MORE`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            windows,
+            target_os = "aix",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "vita",
+        )))]
+        const MORE = bitcast!(c::MSG_MORE);
+        #[cfg(not(any(apple, windows, target_os = "vita")))]
+        /// `MSG_NOSIGNAL`
+        const NOSIGNAL = bitcast!(c::MSG_NOSIGNAL);
+        /// `MSG_OOB`
+        const OOB = bitcast!(c::MSG_OOB);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `MSG_*` flags for use with [`recv`], [`recvfrom`], and related
+    /// functions.
+    ///
+    /// [`recv`]: crate::net::recv
+    /// [`recvfrom`]: crate::net::recvfrom
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct RecvFlags: u32 {
+        #[cfg(not(any(
+            apple,
+            solarish,
+            windows,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "vita",
+        )))]
+        /// `MSG_CMSG_CLOEXEC`
+        const CMSG_CLOEXEC = bitcast!(c::MSG_CMSG_CLOEXEC);
+        /// `MSG_DONTWAIT`
+        #[cfg(not(windows))]
+        const DONTWAIT = bitcast!(c::MSG_DONTWAIT);
+        /// `MSG_ERRQUEUE`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            windows,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "vita",
+        )))]
+        const ERRQUEUE = bitcast!(c::MSG_ERRQUEUE);
+        /// `MSG_OOB`
+        const OOB = bitcast!(c::MSG_OOB);
+        /// `MSG_PEEK`
+        const PEEK = bitcast!(c::MSG_PEEK);
+        /// `MSG_TRUNC`
+        const TRUNC = bitcast!(c::MSG_TRUNC);
+        /// `MSG_WAITALL`
+        const WAITALL = bitcast!(c::MSG_WAITALL);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/net/sockopt.rs b/vendor/rustix/src/backend/libc/net/sockopt.rs
new file mode 100644
index 0000000..cff2ca2
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/sockopt.rs
@@ -0,0 +1,1065 @@
+//! libc syscalls supporting `rustix::net::sockopt`.
+
+use super::ext::{in6_addr_new, in_addr_new};
+use crate::backend::c;
+use crate::backend::conv::{borrowed_fd, ret};
+use crate::fd::BorrowedFd;
+#[cfg(feature = "alloc")]
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+use crate::ffi::CStr;
+use crate::io;
+use crate::net::sockopt::Timeout;
+#[cfg(not(any(
+    apple,
+    windows,
+    target_os = "aix",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "netbsd",
+    target_os = "nto",
+    target_os = "vita",
+)))]
+use crate::net::AddressFamily;
+#[cfg(any(
+    linux_kernel,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "openbsd",
+    target_os = "redox",
+    target_env = "newlib"
+))]
+use crate::net::Protocol;
+#[cfg(any(
+    linux_kernel,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "openbsd",
+    target_os = "redox",
+    target_env = "newlib"
+))]
+use crate::net::RawProtocol;
+use crate::net::{Ipv4Addr, Ipv6Addr, SocketType};
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+use crate::net::{SocketAddrAny, SocketAddrStorage, SocketAddrV4};
+#[cfg(linux_kernel)]
+use crate::net::{SocketAddrV6, UCred};
+use crate::utils::as_mut_ptr;
+#[cfg(feature = "alloc")]
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+use alloc::borrow::ToOwned;
+#[cfg(feature = "alloc")]
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+use alloc::string::String;
+#[cfg(apple)]
+use c::TCP_KEEPALIVE as TCP_KEEPIDLE;
+#[cfg(not(any(apple, target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+use c::TCP_KEEPIDLE;
+use core::mem::{size_of, MaybeUninit};
+use core::time::Duration;
+#[cfg(windows)]
+use windows_sys::Win32::Foundation::BOOL;
+
+#[inline]
+fn getsockopt<T: Copy>(fd: BorrowedFd<'_>, level: i32, optname: i32) -> io::Result<T> {
+    let mut optlen = core::mem::size_of::<T>().try_into().unwrap();
+    debug_assert!(
+        optlen as usize >= core::mem::size_of::<c::c_int>(),
+        "Socket APIs don't ever use `bool` directly"
+    );
+
+    let mut value = MaybeUninit::<T>::zeroed();
+    getsockopt_raw(fd, level, optname, &mut value, &mut optlen)?;
+
+    // On Windows at least, `getsockopt` has been observed writing 1
+    // byte on at least (`IPPROTO_TCP`, `TCP_NODELAY`), even though
+    // Windows' documentation says that should write a 4-byte `BOOL`.
+    // So, we initialize the memory to zeros above, and just assert
+    // that `getsockopt` doesn't write too many bytes here.
+    assert!(
+        optlen as usize <= size_of::<T>(),
+        "unexpected getsockopt size"
+    );
+
+    unsafe { Ok(value.assume_init()) }
+}
+
+#[inline]
+fn getsockopt_raw<T>(
+    fd: BorrowedFd<'_>,
+    level: i32,
+    optname: i32,
+    value: &mut MaybeUninit<T>,
+    optlen: &mut c::socklen_t,
+) -> io::Result<()> {
+    unsafe {
+        ret(c::getsockopt(
+            borrowed_fd(fd),
+            level,
+            optname,
+            as_mut_ptr(value).cast(),
+            optlen,
+        ))
+    }
+}
+
+#[inline]
+fn setsockopt<T: Copy>(fd: BorrowedFd<'_>, level: i32, optname: i32, value: T) -> io::Result<()> {
+    let optlen = core::mem::size_of::<T>().try_into().unwrap();
+    debug_assert!(
+        optlen as usize >= core::mem::size_of::<c::c_int>(),
+        "Socket APIs don't ever use `bool` directly"
+    );
+    setsockopt_raw(fd, level, optname, &value, optlen)
+}
+
+#[inline]
+fn setsockopt_raw<T>(
+    fd: BorrowedFd<'_>,
+    level: i32,
+    optname: i32,
+    ptr: *const T,
+    optlen: c::socklen_t,
+) -> io::Result<()> {
+    unsafe {
+        ret(c::setsockopt(
+            borrowed_fd(fd),
+            level,
+            optname,
+            ptr.cast(),
+            optlen,
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn get_socket_type(fd: BorrowedFd<'_>) -> io::Result<SocketType> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_TYPE)
+}
+
+#[inline]
+pub(crate) fn set_socket_reuseaddr(fd: BorrowedFd<'_>, reuseaddr: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_REUSEADDR, from_bool(reuseaddr))
+}
+
+#[inline]
+pub(crate) fn get_socket_reuseaddr(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_REUSEADDR).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_broadcast(fd: BorrowedFd<'_>, broadcast: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_BROADCAST, from_bool(broadcast))
+}
+
+#[inline]
+pub(crate) fn get_socket_broadcast(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_BROADCAST).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_linger(fd: BorrowedFd<'_>, linger: Option<Duration>) -> io::Result<()> {
+    // Convert `linger` to seconds, rounding up.
+    let l_linger = if let Some(linger) = linger {
+        duration_to_secs(linger)?
+    } else {
+        0
+    };
+    let linger = c::linger {
+        l_onoff: linger.is_some().into(),
+        l_linger,
+    };
+    setsockopt(fd, c::SOL_SOCKET, c::SO_LINGER, linger)
+}
+
+#[inline]
+pub(crate) fn get_socket_linger(fd: BorrowedFd<'_>) -> io::Result<Option<Duration>> {
+    let linger: c::linger = getsockopt(fd, c::SOL_SOCKET, c::SO_LINGER)?;
+    Ok((linger.l_onoff != 0).then(|| Duration::from_secs(linger.l_linger as u64)))
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn set_socket_passcred(fd: BorrowedFd<'_>, passcred: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_PASSCRED, from_bool(passcred))
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn get_socket_passcred(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_PASSCRED).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_timeout(
+    fd: BorrowedFd<'_>,
+    id: Timeout,
+    timeout: Option<Duration>,
+) -> io::Result<()> {
+    let optname = match id {
+        Timeout::Recv => c::SO_RCVTIMEO,
+        Timeout::Send => c::SO_SNDTIMEO,
+    };
+
+    #[cfg(not(windows))]
+    let timeout = match timeout {
+        Some(timeout) => {
+            if timeout == Duration::ZERO {
+                return Err(io::Errno::INVAL);
+            }
+
+            // Rust's musl libc bindings deprecated `time_t` while they
+            // transition to 64-bit `time_t`. What we want here is just
+            // “whatever type `timeval`'s `tv_sec` is”, so we're ok using
+            // the deprecated type.
+            #[allow(deprecated)]
+            let tv_sec = timeout.as_secs().try_into().unwrap_or(c::time_t::MAX);
+
+            // `subsec_micros` rounds down, so we use `subsec_nanos` and
+            // manually round up.
+            let mut timeout = c::timeval {
+                tv_sec,
+                tv_usec: ((timeout.subsec_nanos() + 999) / 1000) as _,
+            };
+            if timeout.tv_sec == 0 && timeout.tv_usec == 0 {
+                timeout.tv_usec = 1;
+            }
+            timeout
+        }
+        None => c::timeval {
+            tv_sec: 0,
+            tv_usec: 0,
+        },
+    };
+
+    #[cfg(windows)]
+    let timeout: u32 = match timeout {
+        Some(timeout) => {
+            if timeout == Duration::ZERO {
+                return Err(io::Errno::INVAL);
+            }
+
+            // `as_millis` rounds down, so we use `as_nanos` and
+            // manually round up.
+            let mut timeout: u32 = ((timeout.as_nanos() + 999_999) / 1_000_000)
+                .try_into()
+                .map_err(|_convert_err| io::Errno::INVAL)?;
+            if timeout == 0 {
+                timeout = 1;
+            }
+            timeout
+        }
+        None => 0,
+    };
+
+    setsockopt(fd, c::SOL_SOCKET, optname, timeout)
+}
+
+#[inline]
+pub(crate) fn get_socket_timeout(fd: BorrowedFd<'_>, id: Timeout) -> io::Result<Option<Duration>> {
+    let optname = match id {
+        Timeout::Recv => c::SO_RCVTIMEO,
+        Timeout::Send => c::SO_SNDTIMEO,
+    };
+
+    #[cfg(not(windows))]
+    {
+        let timeout: c::timeval = getsockopt(fd, c::SOL_SOCKET, optname)?;
+        if timeout.tv_sec == 0 && timeout.tv_usec == 0 {
+            Ok(None)
+        } else {
+            Ok(Some(
+                Duration::from_secs(timeout.tv_sec as u64)
+                    + Duration::from_micros(timeout.tv_usec as u64),
+            ))
+        }
+    }
+
+    #[cfg(windows)]
+    {
+        let timeout: u32 = getsockopt(fd, c::SOL_SOCKET, optname)?;
+        if timeout == 0 {
+            Ok(None)
+        } else {
+            Ok(Some(Duration::from_millis(timeout as u64)))
+        }
+    }
+}
+
+#[cfg(any(apple, freebsdlike, target_os = "netbsd"))]
+#[inline]
+pub(crate) fn get_socket_nosigpipe(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_NOSIGPIPE).map(to_bool)
+}
+
+#[cfg(any(apple, freebsdlike, target_os = "netbsd"))]
+#[inline]
+pub(crate) fn set_socket_nosigpipe(fd: BorrowedFd<'_>, val: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_NOSIGPIPE, from_bool(val))
+}
+
+#[inline]
+pub(crate) fn get_socket_error(fd: BorrowedFd<'_>) -> io::Result<Result<(), io::Errno>> {
+    let err: c::c_int = getsockopt(fd, c::SOL_SOCKET, c::SO_ERROR)?;
+    Ok(if err == 0 {
+        Ok(())
+    } else {
+        Err(io::Errno::from_raw_os_error(err))
+    })
+}
+
+#[inline]
+pub(crate) fn set_socket_keepalive(fd: BorrowedFd<'_>, keepalive: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_KEEPALIVE, from_bool(keepalive))
+}
+
+#[inline]
+pub(crate) fn get_socket_keepalive(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_KEEPALIVE).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_recv_buffer_size(fd: BorrowedFd<'_>, size: usize) -> io::Result<()> {
+    let size: c::c_int = size.try_into().map_err(|_| io::Errno::INVAL)?;
+    setsockopt(fd, c::SOL_SOCKET, c::SO_RCVBUF, size)
+}
+
+#[inline]
+pub(crate) fn get_socket_recv_buffer_size(fd: BorrowedFd<'_>) -> io::Result<usize> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_RCVBUF).map(|size: u32| size as usize)
+}
+
+#[inline]
+pub(crate) fn set_socket_send_buffer_size(fd: BorrowedFd<'_>, size: usize) -> io::Result<()> {
+    let size: c::c_int = size.try_into().map_err(|_| io::Errno::INVAL)?;
+    setsockopt(fd, c::SOL_SOCKET, c::SO_SNDBUF, size)
+}
+
+#[inline]
+pub(crate) fn get_socket_send_buffer_size(fd: BorrowedFd<'_>) -> io::Result<usize> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_SNDBUF).map(|size: u32| size as usize)
+}
+
+#[inline]
+#[cfg(not(any(
+    apple,
+    windows,
+    target_os = "aix",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "netbsd",
+    target_os = "nto",
+    target_os = "vita",
+)))]
+pub(crate) fn get_socket_domain(fd: BorrowedFd<'_>) -> io::Result<AddressFamily> {
+    let domain: c::c_int = getsockopt(fd, c::SOL_SOCKET, c::SO_DOMAIN)?;
+    Ok(AddressFamily(
+        domain.try_into().map_err(|_| io::Errno::OPNOTSUPP)?,
+    ))
+}
+
+#[inline]
+#[cfg(not(apple))] // Apple platforms declare the constant, but do not actually implement it.
+pub(crate) fn get_socket_acceptconn(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_ACCEPTCONN).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_oobinline(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_OOBINLINE, from_bool(value))
+}
+
+#[inline]
+pub(crate) fn get_socket_oobinline(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_OOBINLINE).map(to_bool)
+}
+
+#[cfg(not(any(solarish, windows)))]
+#[inline]
+pub(crate) fn set_socket_reuseport(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_REUSEPORT, from_bool(value))
+}
+
+#[cfg(not(any(solarish, windows)))]
+#[inline]
+pub(crate) fn get_socket_reuseport(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_REUSEPORT).map(to_bool)
+}
+
+#[cfg(target_os = "freebsd")]
+#[inline]
+pub(crate) fn set_socket_reuseport_lb(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_REUSEPORT_LB, from_bool(value))
+}
+
+#[cfg(target_os = "freebsd")]
+#[inline]
+pub(crate) fn get_socket_reuseport_lb(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_REUSEPORT_LB).map(to_bool)
+}
+
+#[cfg(any(
+    linux_kernel,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "openbsd",
+    target_os = "redox",
+    target_env = "newlib"
+))]
+#[inline]
+pub(crate) fn get_socket_protocol(fd: BorrowedFd<'_>) -> io::Result<Option<Protocol>> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_PROTOCOL)
+        .map(|raw| RawProtocol::new(raw).map(Protocol::from_raw))
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+pub(crate) fn get_socket_cookie(fd: BorrowedFd<'_>) -> io::Result<u64> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_COOKIE)
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+pub(crate) fn get_socket_incoming_cpu(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_INCOMING_CPU)
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+pub(crate) fn set_socket_incoming_cpu(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_INCOMING_CPU, value)
+}
+
+#[inline]
+pub(crate) fn set_ip_ttl(fd: BorrowedFd<'_>, ttl: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_TTL, ttl)
+}
+
+#[inline]
+pub(crate) fn get_ip_ttl(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_TTL)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_v6only(fd: BorrowedFd<'_>, only_v6: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_V6ONLY, from_bool(only_v6))
+}
+
+#[inline]
+pub(crate) fn get_ipv6_v6only(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_V6ONLY).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_ip_multicast_loop(fd: BorrowedFd<'_>, multicast_loop: bool) -> io::Result<()> {
+    setsockopt(
+        fd,
+        c::IPPROTO_IP,
+        c::IP_MULTICAST_LOOP,
+        from_bool(multicast_loop),
+    )
+}
+
+#[inline]
+pub(crate) fn get_ip_multicast_loop(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_MULTICAST_LOOP).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_ip_multicast_ttl(fd: BorrowedFd<'_>, multicast_ttl: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_MULTICAST_TTL, multicast_ttl)
+}
+
+#[inline]
+pub(crate) fn get_ip_multicast_ttl(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_MULTICAST_TTL)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_multicast_loop(fd: BorrowedFd<'_>, multicast_loop: bool) -> io::Result<()> {
+    setsockopt(
+        fd,
+        c::IPPROTO_IPV6,
+        c::IPV6_MULTICAST_LOOP,
+        from_bool(multicast_loop),
+    )
+}
+
+#[inline]
+pub(crate) fn get_ipv6_multicast_loop(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_MULTICAST_LOOP).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_multicast_hops(fd: BorrowedFd<'_>, multicast_hops: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IPV6_MULTICAST_HOPS, multicast_hops)
+}
+
+#[inline]
+pub(crate) fn get_ipv6_multicast_hops(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IP, c::IPV6_MULTICAST_HOPS)
+}
+
+#[inline]
+pub(crate) fn set_ip_add_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+) -> io::Result<()> {
+    let mreq = to_ip_mreq(multiaddr, interface);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_ADD_MEMBERSHIP, mreq)
+}
+
+#[cfg(any(
+    apple,
+    freebsdlike,
+    linux_like,
+    target_os = "fuchsia",
+    target_os = "openbsd"
+))]
+#[inline]
+pub(crate) fn set_ip_add_membership_with_ifindex(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    address: &Ipv4Addr,
+    ifindex: i32,
+) -> io::Result<()> {
+    let mreqn = to_ip_mreqn(multiaddr, address, ifindex);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_ADD_MEMBERSHIP, mreqn)
+}
+
+#[cfg(any(apple, freebsdlike, linux_like, solarish, target_os = "aix"))]
+#[inline]
+pub(crate) fn set_ip_add_source_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+    sourceaddr: &Ipv4Addr,
+) -> io::Result<()> {
+    let mreq_source = to_imr_source(multiaddr, interface, sourceaddr);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_ADD_SOURCE_MEMBERSHIP, mreq_source)
+}
+
+#[cfg(any(apple, freebsdlike, linux_like, solarish, target_os = "aix"))]
+#[inline]
+pub(crate) fn set_ip_drop_source_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+    sourceaddr: &Ipv4Addr,
+) -> io::Result<()> {
+    let mreq_source = to_imr_source(multiaddr, interface, sourceaddr);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_DROP_SOURCE_MEMBERSHIP, mreq_source)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_add_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv6Addr,
+    interface: u32,
+) -> io::Result<()> {
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        target_os = "haiku",
+        target_os = "l4re",
+        target_os = "nto"
+    )))]
+    use c::IPV6_ADD_MEMBERSHIP;
+    #[cfg(any(
+        bsd,
+        solarish,
+        target_os = "haiku",
+        target_os = "l4re",
+        target_os = "nto"
+    ))]
+    use c::IPV6_JOIN_GROUP as IPV6_ADD_MEMBERSHIP;
+
+    let mreq = to_ipv6mr(multiaddr, interface);
+    setsockopt(fd, c::IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, mreq)
+}
+
+#[inline]
+pub(crate) fn set_ip_drop_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+) -> io::Result<()> {
+    let mreq = to_ip_mreq(multiaddr, interface);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_DROP_MEMBERSHIP, mreq)
+}
+
+#[cfg(any(
+    apple,
+    freebsdlike,
+    linux_like,
+    target_os = "fuchsia",
+    target_os = "openbsd"
+))]
+#[inline]
+pub(crate) fn set_ip_drop_membership_with_ifindex(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    address: &Ipv4Addr,
+    ifindex: i32,
+) -> io::Result<()> {
+    let mreqn = to_ip_mreqn(multiaddr, address, ifindex);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_DROP_MEMBERSHIP, mreqn)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_drop_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv6Addr,
+    interface: u32,
+) -> io::Result<()> {
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        target_os = "haiku",
+        target_os = "l4re",
+        target_os = "nto"
+    )))]
+    use c::IPV6_DROP_MEMBERSHIP;
+    #[cfg(any(
+        bsd,
+        solarish,
+        target_os = "haiku",
+        target_os = "l4re",
+        target_os = "nto"
+    ))]
+    use c::IPV6_LEAVE_GROUP as IPV6_DROP_MEMBERSHIP;
+
+    let mreq = to_ipv6mr(multiaddr, interface);
+    setsockopt(fd, c::IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, mreq)
+}
+
+#[inline]
+pub(crate) fn get_ipv6_unicast_hops(fd: BorrowedFd<'_>) -> io::Result<u8> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_UNICAST_HOPS).map(|hops: c::c_int| hops as u8)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_unicast_hops(fd: BorrowedFd<'_>, hops: Option<u8>) -> io::Result<()> {
+    let hops = match hops {
+        Some(hops) => hops as c::c_int,
+        None => -1,
+    };
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_UNICAST_HOPS, hops)
+}
+
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "haiku",
+    target_os = "nto",
+    target_env = "newlib"
+))]
+#[inline]
+pub(crate) fn set_ip_tos(fd: BorrowedFd<'_>, value: u8) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_TOS, i32::from(value))
+}
+
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "haiku",
+    target_os = "nto",
+    target_env = "newlib"
+))]
+#[inline]
+pub(crate) fn get_ip_tos(fd: BorrowedFd<'_>) -> io::Result<u8> {
+    let value: i32 = getsockopt(fd, c::IPPROTO_IP, c::IP_TOS)?;
+    Ok(value as u8)
+}
+
+#[cfg(any(apple, linux_like, target_os = "freebsd", target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn set_ip_recvtos(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_RECVTOS, from_bool(value))
+}
+
+#[cfg(any(apple, linux_like, target_os = "freebsd", target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn get_ip_recvtos(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_RECVTOS).map(to_bool)
+}
+
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "nto"
+))]
+#[inline]
+pub(crate) fn set_ipv6_recvtclass(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_RECVTCLASS, from_bool(value))
+}
+
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "nto"
+))]
+#[inline]
+pub(crate) fn get_ipv6_recvtclass(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_RECVTCLASS).map(to_bool)
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn set_ip_freebind(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_FREEBIND, from_bool(value))
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn get_ip_freebind(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_FREEBIND).map(to_bool)
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn set_ipv6_freebind(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_FREEBIND, from_bool(value))
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn get_ipv6_freebind(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_FREEBIND).map(to_bool)
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn get_ip_original_dst(fd: BorrowedFd<'_>) -> io::Result<SocketAddrV4> {
+    let level = c::IPPROTO_IP;
+    let optname = c::SO_ORIGINAL_DST;
+    let mut value = MaybeUninit::<SocketAddrStorage>::uninit();
+    let mut optlen = core::mem::size_of_val(&value).try_into().unwrap();
+
+    getsockopt_raw(fd, level, optname, &mut value, &mut optlen)?;
+
+    let any = unsafe { SocketAddrAny::read(value.as_ptr(), optlen as usize)? };
+    match any {
+        SocketAddrAny::V4(v4) => Ok(v4),
+        _ => unreachable!(),
+    }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn get_ipv6_original_dst(fd: BorrowedFd<'_>) -> io::Result<SocketAddrV6> {
+    let level = c::IPPROTO_IPV6;
+    let optname = c::IP6T_SO_ORIGINAL_DST;
+    let mut value = MaybeUninit::<SocketAddrStorage>::uninit();
+    let mut optlen = core::mem::size_of_val(&value).try_into().unwrap();
+
+    getsockopt_raw(fd, level, optname, &mut value, &mut optlen)?;
+
+    let any = unsafe { SocketAddrAny::read(value.as_ptr(), optlen as usize)? };
+    match any {
+        SocketAddrAny::V6(v6) => Ok(v6),
+        _ => unreachable!(),
+    }
+}
+
+#[cfg(not(any(
+    solarish,
+    windows,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "vita"
+)))]
+#[inline]
+pub(crate) fn set_ipv6_tclass(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_TCLASS, value)
+}
+
+#[cfg(not(any(
+    solarish,
+    windows,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "vita"
+)))]
+#[inline]
+pub(crate) fn get_ipv6_tclass(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_TCLASS)
+}
+
+#[inline]
+pub(crate) fn set_tcp_nodelay(fd: BorrowedFd<'_>, nodelay: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_NODELAY, from_bool(nodelay))
+}
+
+#[inline]
+pub(crate) fn get_tcp_nodelay(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_NODELAY).map(to_bool)
+}
+
+#[inline]
+#[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+pub(crate) fn set_tcp_keepcnt(fd: BorrowedFd<'_>, count: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_KEEPCNT, count)
+}
+
+#[inline]
+#[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+pub(crate) fn get_tcp_keepcnt(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_KEEPCNT)
+}
+
+#[inline]
+#[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+pub(crate) fn set_tcp_keepidle(fd: BorrowedFd<'_>, duration: Duration) -> io::Result<()> {
+    let secs: c::c_uint = duration_to_secs(duration)?;
+    setsockopt(fd, c::IPPROTO_TCP, TCP_KEEPIDLE, secs)
+}
+
+#[inline]
+#[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+pub(crate) fn get_tcp_keepidle(fd: BorrowedFd<'_>) -> io::Result<Duration> {
+    let secs: c::c_uint = getsockopt(fd, c::IPPROTO_TCP, TCP_KEEPIDLE)?;
+    Ok(Duration::from_secs(secs as u64))
+}
+
+#[inline]
+#[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+pub(crate) fn set_tcp_keepintvl(fd: BorrowedFd<'_>, duration: Duration) -> io::Result<()> {
+    let secs: c::c_uint = duration_to_secs(duration)?;
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_KEEPINTVL, secs)
+}
+
+#[inline]
+#[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+pub(crate) fn get_tcp_keepintvl(fd: BorrowedFd<'_>) -> io::Result<Duration> {
+    let secs: c::c_uint = getsockopt(fd, c::IPPROTO_TCP, c::TCP_KEEPINTVL)?;
+    Ok(Duration::from_secs(secs as u64))
+}
+
+#[inline]
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+pub(crate) fn set_tcp_user_timeout(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_USER_TIMEOUT, value)
+}
+
+#[inline]
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+pub(crate) fn get_tcp_user_timeout(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_USER_TIMEOUT)
+}
+
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn set_tcp_quickack(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_QUICKACK, from_bool(value))
+}
+
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn get_tcp_quickack(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_QUICKACK).map(to_bool)
+}
+
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+#[inline]
+pub(crate) fn set_tcp_congestion(fd: BorrowedFd<'_>, value: &str) -> io::Result<()> {
+    let level = c::IPPROTO_TCP;
+    let optname = c::TCP_CONGESTION;
+    let optlen = value.len().try_into().unwrap();
+    setsockopt_raw(fd, level, optname, value.as_ptr(), optlen)
+}
+
+#[cfg(feature = "alloc")]
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+#[inline]
+pub(crate) fn get_tcp_congestion(fd: BorrowedFd<'_>) -> io::Result<String> {
+    let level = c::IPPROTO_TCP;
+    let optname = c::TCP_CONGESTION;
+    const OPTLEN: c::socklen_t = 16;
+    let mut value = MaybeUninit::<[MaybeUninit<u8>; OPTLEN as usize]>::uninit();
+    let mut optlen = OPTLEN;
+    getsockopt_raw(fd, level, optname, &mut value, &mut optlen)?;
+    unsafe {
+        let value = value.assume_init();
+        let slice: &[u8] = core::mem::transmute(&value[..optlen as usize]);
+        assert!(slice.iter().any(|b| *b == b'\0'));
+        Ok(
+            core::str::from_utf8(CStr::from_ptr(slice.as_ptr().cast()).to_bytes())
+                .unwrap()
+                .to_owned(),
+        )
+    }
+}
+
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn set_tcp_thin_linear_timeouts(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(
+        fd,
+        c::IPPROTO_TCP,
+        c::TCP_THIN_LINEAR_TIMEOUTS,
+        from_bool(value),
+    )
+}
+
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn get_tcp_thin_linear_timeouts(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_THIN_LINEAR_TIMEOUTS).map(to_bool)
+}
+
+#[cfg(any(linux_like, solarish, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn set_tcp_cork(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_CORK, from_bool(value))
+}
+
+#[cfg(any(linux_like, solarish, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn get_tcp_cork(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_CORK).map(to_bool)
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn get_socket_peercred(fd: BorrowedFd<'_>) -> io::Result<UCred> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_PEERCRED)
+}
+
+#[inline]
+fn to_ip_mreq(multiaddr: &Ipv4Addr, interface: &Ipv4Addr) -> c::ip_mreq {
+    c::ip_mreq {
+        imr_multiaddr: to_imr_addr(multiaddr),
+        imr_interface: to_imr_addr(interface),
+    }
+}
+
+#[cfg(any(
+    apple,
+    freebsdlike,
+    linux_like,
+    target_os = "fuchsia",
+    target_os = "openbsd"
+))]
+#[inline]
+fn to_ip_mreqn(multiaddr: &Ipv4Addr, address: &Ipv4Addr, ifindex: i32) -> c::ip_mreqn {
+    c::ip_mreqn {
+        imr_multiaddr: to_imr_addr(multiaddr),
+        imr_address: to_imr_addr(address),
+        imr_ifindex: ifindex,
+    }
+}
+
+#[cfg(any(apple, freebsdlike, linux_like, solarish, target_os = "aix"))]
+#[inline]
+fn to_imr_source(
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+    sourceaddr: &Ipv4Addr,
+) -> c::ip_mreq_source {
+    c::ip_mreq_source {
+        imr_multiaddr: to_imr_addr(multiaddr),
+        imr_interface: to_imr_addr(interface),
+        imr_sourceaddr: to_imr_addr(sourceaddr),
+    }
+}
+
+#[inline]
+fn to_imr_addr(addr: &Ipv4Addr) -> c::in_addr {
+    in_addr_new(u32::from_ne_bytes(addr.octets()))
+}
+
+#[inline]
+fn to_ipv6mr(multiaddr: &Ipv6Addr, interface: u32) -> c::ipv6_mreq {
+    c::ipv6_mreq {
+        ipv6mr_multiaddr: to_ipv6mr_multiaddr(multiaddr),
+        ipv6mr_interface: to_ipv6mr_interface(interface),
+    }
+}
+
+#[inline]
+fn to_ipv6mr_multiaddr(multiaddr: &Ipv6Addr) -> c::in6_addr {
+    in6_addr_new(multiaddr.octets())
+}
+
+#[cfg(target_os = "android")]
+#[inline]
+fn to_ipv6mr_interface(interface: u32) -> c::c_int {
+    interface as c::c_int
+}
+
+#[cfg(not(target_os = "android"))]
+#[inline]
+fn to_ipv6mr_interface(interface: u32) -> c::c_uint {
+    interface as c::c_uint
+}
+
+// `getsockopt` and `setsockopt` represent boolean values as integers.
+#[cfg(not(windows))]
+type RawSocketBool = c::c_int;
+#[cfg(windows)]
+type RawSocketBool = BOOL;
+
+// Wrap `RawSocketBool` in a newtype to discourage misuse.
+#[repr(transparent)]
+#[derive(Copy, Clone)]
+struct SocketBool(RawSocketBool);
+
+// Convert from a `bool` to a `SocketBool`.
+#[inline]
+fn from_bool(value: bool) -> SocketBool {
+    SocketBool(value.into())
+}
+
+// Convert from a `SocketBool` to a `bool`.
+#[inline]
+fn to_bool(value: SocketBool) -> bool {
+    value.0 != 0
+}
+
+/// Convert to seconds, rounding up if necessary.
+#[inline]
+fn duration_to_secs<T: TryFrom<u64>>(duration: Duration) -> io::Result<T> {
+    let mut secs = duration.as_secs();
+    if duration.subsec_nanos() != 0 {
+        secs = secs.checked_add(1).ok_or(io::Errno::INVAL)?;
+    }
+    T::try_from(secs).map_err(|_e| io::Errno::INVAL)
+}
diff --git a/vendor/rustix/src/backend/libc/net/syscalls.rs b/vendor/rustix/src/backend/libc/net/syscalls.rs
new file mode 100644
index 0000000..48dbf1f
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/syscalls.rs
@@ -0,0 +1,568 @@
+//! libc syscalls supporting `rustix::net`.
+
+#[cfg(unix)]
+use super::addr::SocketAddrUnix;
+use crate::backend::c;
+use crate::backend::conv::{borrowed_fd, ret, ret_owned_fd, ret_send_recv, send_recv_len};
+use crate::fd::{BorrowedFd, OwnedFd};
+use crate::io;
+use crate::net::{SocketAddrAny, SocketAddrV4, SocketAddrV6};
+use crate::utils::as_ptr;
+use core::mem::{size_of, MaybeUninit};
+#[cfg(not(any(
+    windows,
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+use {
+    super::msghdr::{with_noaddr_msghdr, with_recv_msghdr, with_v4_msghdr, with_v6_msghdr},
+    crate::io::{IoSlice, IoSliceMut},
+    crate::net::{RecvAncillaryBuffer, RecvMsgReturn, SendAncillaryBuffer},
+};
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+use {
+    super::read_sockaddr::{initialize_family_to_unspec, maybe_read_sockaddr_os, read_sockaddr_os},
+    super::send_recv::{RecvFlags, SendFlags},
+    super::write_sockaddr::{encode_sockaddr_v4, encode_sockaddr_v6},
+    crate::net::{AddressFamily, Protocol, Shutdown, SocketFlags, SocketType},
+    core::ptr::null_mut,
+};
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) unsafe fn recv(
+    fd: BorrowedFd<'_>,
+    buf: *mut u8,
+    len: usize,
+    flags: RecvFlags,
+) -> io::Result<usize> {
+    ret_send_recv(c::recv(
+        borrowed_fd(fd),
+        buf.cast(),
+        send_recv_len(len),
+        bitflags_bits!(flags),
+    ))
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn send(fd: BorrowedFd<'_>, buf: &[u8], flags: SendFlags) -> io::Result<usize> {
+    unsafe {
+        ret_send_recv(c::send(
+            borrowed_fd(fd),
+            buf.as_ptr().cast(),
+            send_recv_len(buf.len()),
+            bitflags_bits!(flags),
+        ))
+    }
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) unsafe fn recvfrom(
+    fd: BorrowedFd<'_>,
+    buf: *mut u8,
+    buf_len: usize,
+    flags: RecvFlags,
+) -> io::Result<(usize, Option<SocketAddrAny>)> {
+    let mut storage = MaybeUninit::<c::sockaddr_storage>::uninit();
+    let mut len = size_of::<c::sockaddr_storage>() as c::socklen_t;
+
+    // `recvfrom` does not write to the storage if the socket is
+    // connection-oriented sockets, so we initialize the family field to
+    // `AF_UNSPEC` so that we can detect this case.
+    initialize_family_to_unspec(storage.as_mut_ptr());
+
+    ret_send_recv(c::recvfrom(
+        borrowed_fd(fd),
+        buf.cast(),
+        send_recv_len(buf_len),
+        bitflags_bits!(flags),
+        storage.as_mut_ptr().cast(),
+        &mut len,
+    ))
+    .map(|nread| {
+        (
+            nread,
+            maybe_read_sockaddr_os(storage.as_ptr(), len.try_into().unwrap()),
+        )
+    })
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn sendto_v4(
+    fd: BorrowedFd<'_>,
+    buf: &[u8],
+    flags: SendFlags,
+    addr: &SocketAddrV4,
+) -> io::Result<usize> {
+    unsafe {
+        ret_send_recv(c::sendto(
+            borrowed_fd(fd),
+            buf.as_ptr().cast(),
+            send_recv_len(buf.len()),
+            bitflags_bits!(flags),
+            as_ptr(&encode_sockaddr_v4(addr)).cast::<c::sockaddr>(),
+            size_of::<c::sockaddr_in>() as c::socklen_t,
+        ))
+    }
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn sendto_v6(
+    fd: BorrowedFd<'_>,
+    buf: &[u8],
+    flags: SendFlags,
+    addr: &SocketAddrV6,
+) -> io::Result<usize> {
+    unsafe {
+        ret_send_recv(c::sendto(
+            borrowed_fd(fd),
+            buf.as_ptr().cast(),
+            send_recv_len(buf.len()),
+            bitflags_bits!(flags),
+            as_ptr(&encode_sockaddr_v6(addr)).cast::<c::sockaddr>(),
+            size_of::<c::sockaddr_in6>() as c::socklen_t,
+        ))
+    }
+}
+
+#[cfg(not(any(windows, target_os = "redox", target_os = "wasi")))]
+pub(crate) fn sendto_unix(
+    fd: BorrowedFd<'_>,
+    buf: &[u8],
+    flags: SendFlags,
+    addr: &SocketAddrUnix,
+) -> io::Result<usize> {
+    unsafe {
+        ret_send_recv(c::sendto(
+            borrowed_fd(fd),
+            buf.as_ptr().cast(),
+            send_recv_len(buf.len()),
+            bitflags_bits!(flags),
+            as_ptr(&addr.unix).cast(),
+            addr.addr_len(),
+        ))
+    }
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn socket(
+    domain: AddressFamily,
+    type_: SocketType,
+    protocol: Option<Protocol>,
+) -> io::Result<OwnedFd> {
+    let raw_protocol = match protocol {
+        Some(p) => p.0.get(),
+        None => 0,
+    };
+    unsafe {
+        ret_owned_fd(c::socket(
+            domain.0 as c::c_int,
+            type_.0 as c::c_int,
+            raw_protocol as c::c_int,
+        ))
+    }
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn socket_with(
+    domain: AddressFamily,
+    type_: SocketType,
+    flags: SocketFlags,
+    protocol: Option<Protocol>,
+) -> io::Result<OwnedFd> {
+    let raw_protocol = match protocol {
+        Some(p) => p.0.get(),
+        None => 0,
+    };
+    unsafe {
+        ret_owned_fd(c::socket(
+            domain.0 as c::c_int,
+            (type_.0 | flags.bits()) as c::c_int,
+            raw_protocol as c::c_int,
+        ))
+    }
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn bind_v4(sockfd: BorrowedFd<'_>, addr: &SocketAddrV4) -> io::Result<()> {
+    unsafe {
+        ret(c::bind(
+            borrowed_fd(sockfd),
+            as_ptr(&encode_sockaddr_v4(addr)).cast(),
+            size_of::<c::sockaddr_in>() as c::socklen_t,
+        ))
+    }
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn bind_v6(sockfd: BorrowedFd<'_>, addr: &SocketAddrV6) -> io::Result<()> {
+    unsafe {
+        ret(c::bind(
+            borrowed_fd(sockfd),
+            as_ptr(&encode_sockaddr_v6(addr)).cast(),
+            size_of::<c::sockaddr_in6>() as c::socklen_t,
+        ))
+    }
+}
+
+#[cfg(not(any(windows, target_os = "redox", target_os = "wasi")))]
+pub(crate) fn bind_unix(sockfd: BorrowedFd<'_>, addr: &SocketAddrUnix) -> io::Result<()> {
+    unsafe {
+        ret(c::bind(
+            borrowed_fd(sockfd),
+            as_ptr(&addr.unix).cast(),
+            addr.addr_len(),
+        ))
+    }
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn connect_v4(sockfd: BorrowedFd<'_>, addr: &SocketAddrV4) -> io::Result<()> {
+    unsafe {
+        ret(c::connect(
+            borrowed_fd(sockfd),
+            as_ptr(&encode_sockaddr_v4(addr)).cast(),
+            size_of::<c::sockaddr_in>() as c::socklen_t,
+        ))
+    }
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn connect_v6(sockfd: BorrowedFd<'_>, addr: &SocketAddrV6) -> io::Result<()> {
+    unsafe {
+        ret(c::connect(
+            borrowed_fd(sockfd),
+            as_ptr(&encode_sockaddr_v6(addr)).cast(),
+            size_of::<c::sockaddr_in6>() as c::socklen_t,
+        ))
+    }
+}
+
+#[cfg(not(any(windows, target_os = "redox", target_os = "wasi")))]
+pub(crate) fn connect_unix(sockfd: BorrowedFd<'_>, addr: &SocketAddrUnix) -> io::Result<()> {
+    unsafe {
+        ret(c::connect(
+            borrowed_fd(sockfd),
+            as_ptr(&addr.unix).cast(),
+            addr.addr_len(),
+        ))
+    }
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn connect_unspec(sockfd: BorrowedFd<'_>) -> io::Result<()> {
+    debug_assert_eq!(c::AF_UNSPEC, 0);
+    let addr = MaybeUninit::<c::sockaddr_storage>::zeroed();
+    unsafe {
+        ret(c::connect(
+            borrowed_fd(sockfd),
+            as_ptr(&addr).cast(),
+            size_of::<c::sockaddr_storage>() as c::socklen_t,
+        ))
+    }
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn listen(sockfd: BorrowedFd<'_>, backlog: c::c_int) -> io::Result<()> {
+    unsafe { ret(c::listen(borrowed_fd(sockfd), backlog)) }
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn accept(sockfd: BorrowedFd<'_>) -> io::Result<OwnedFd> {
+    unsafe {
+        let owned_fd = ret_owned_fd(c::accept(borrowed_fd(sockfd), null_mut(), null_mut()))?;
+        Ok(owned_fd)
+    }
+}
+
+#[cfg(not(any(
+    windows,
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+pub(crate) fn recvmsg(
+    sockfd: BorrowedFd<'_>,
+    iov: &mut [IoSliceMut<'_>],
+    control: &mut RecvAncillaryBuffer<'_>,
+    msg_flags: RecvFlags,
+) -> io::Result<RecvMsgReturn> {
+    let mut storage = MaybeUninit::<c::sockaddr_storage>::uninit();
+
+    with_recv_msghdr(&mut storage, iov, control, |msghdr| {
+        let result = unsafe {
+            ret_send_recv(c::recvmsg(
+                borrowed_fd(sockfd),
+                msghdr,
+                bitflags_bits!(msg_flags),
+            ))
+        };
+
+        result.map(|bytes| {
+            // Get the address of the sender, if any.
+            let addr =
+                unsafe { maybe_read_sockaddr_os(msghdr.msg_name as _, msghdr.msg_namelen as _) };
+
+            RecvMsgReturn {
+                bytes,
+                address: addr,
+                flags: RecvFlags::from_bits_retain(bitcast!(msghdr.msg_flags)),
+            }
+        })
+    })
+}
+
+#[cfg(not(any(
+    windows,
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+pub(crate) fn sendmsg(
+    sockfd: BorrowedFd<'_>,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    msg_flags: SendFlags,
+) -> io::Result<usize> {
+    with_noaddr_msghdr(iov, control, |msghdr| unsafe {
+        ret_send_recv(c::sendmsg(
+            borrowed_fd(sockfd),
+            &msghdr,
+            bitflags_bits!(msg_flags),
+        ))
+    })
+}
+
+#[cfg(not(any(
+    windows,
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+pub(crate) fn sendmsg_v4(
+    sockfd: BorrowedFd<'_>,
+    addr: &SocketAddrV4,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    msg_flags: SendFlags,
+) -> io::Result<usize> {
+    with_v4_msghdr(addr, iov, control, |msghdr| unsafe {
+        ret_send_recv(c::sendmsg(
+            borrowed_fd(sockfd),
+            &msghdr,
+            bitflags_bits!(msg_flags),
+        ))
+    })
+}
+
+#[cfg(not(any(
+    windows,
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+pub(crate) fn sendmsg_v6(
+    sockfd: BorrowedFd<'_>,
+    addr: &SocketAddrV6,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    msg_flags: SendFlags,
+) -> io::Result<usize> {
+    with_v6_msghdr(addr, iov, control, |msghdr| unsafe {
+        ret_send_recv(c::sendmsg(
+            borrowed_fd(sockfd),
+            &msghdr,
+            bitflags_bits!(msg_flags),
+        ))
+    })
+}
+
+#[cfg(all(
+    unix,
+    not(any(target_os = "espidf", target_os = "redox", target_os = "vita"))
+))]
+pub(crate) fn sendmsg_unix(
+    sockfd: BorrowedFd<'_>,
+    addr: &SocketAddrUnix,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    msg_flags: SendFlags,
+) -> io::Result<usize> {
+    super::msghdr::with_unix_msghdr(addr, iov, control, |msghdr| unsafe {
+        ret_send_recv(c::sendmsg(
+            borrowed_fd(sockfd),
+            &msghdr,
+            bitflags_bits!(msg_flags),
+        ))
+    })
+}
+
+#[cfg(not(any(
+    apple,
+    windows,
+    target_os = "aix",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "redox",
+    target_os = "nto",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+pub(crate) fn accept_with(sockfd: BorrowedFd<'_>, flags: SocketFlags) -> io::Result<OwnedFd> {
+    unsafe {
+        let owned_fd = ret_owned_fd(c::accept4(
+            borrowed_fd(sockfd),
+            null_mut(),
+            null_mut(),
+            flags.bits() as c::c_int,
+        ))?;
+        Ok(owned_fd)
+    }
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn acceptfrom(sockfd: BorrowedFd<'_>) -> io::Result<(OwnedFd, Option<SocketAddrAny>)> {
+    unsafe {
+        let mut storage = MaybeUninit::<c::sockaddr_storage>::uninit();
+        let mut len = size_of::<c::sockaddr_storage>() as c::socklen_t;
+        let owned_fd = ret_owned_fd(c::accept(
+            borrowed_fd(sockfd),
+            storage.as_mut_ptr().cast(),
+            &mut len,
+        ))?;
+        Ok((
+            owned_fd,
+            maybe_read_sockaddr_os(storage.as_ptr(), len.try_into().unwrap()),
+        ))
+    }
+}
+
+#[cfg(not(any(
+    apple,
+    windows,
+    target_os = "aix",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+pub(crate) fn acceptfrom_with(
+    sockfd: BorrowedFd<'_>,
+    flags: SocketFlags,
+) -> io::Result<(OwnedFd, Option<SocketAddrAny>)> {
+    unsafe {
+        let mut storage = MaybeUninit::<c::sockaddr_storage>::uninit();
+        let mut len = size_of::<c::sockaddr_storage>() as c::socklen_t;
+        let owned_fd = ret_owned_fd(c::accept4(
+            borrowed_fd(sockfd),
+            storage.as_mut_ptr().cast(),
+            &mut len,
+            flags.bits() as c::c_int,
+        ))?;
+        Ok((
+            owned_fd,
+            maybe_read_sockaddr_os(storage.as_ptr(), len.try_into().unwrap()),
+        ))
+    }
+}
+
+/// Darwin lacks `accept4`, but does have `accept`. We define
+/// `SocketFlags` to have no flags, so we can discard it here.
+#[cfg(any(
+    apple,
+    windows,
+    target_os = "aix",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "vita",
+))]
+pub(crate) fn accept_with(sockfd: BorrowedFd<'_>, _flags: SocketFlags) -> io::Result<OwnedFd> {
+    accept(sockfd)
+}
+
+/// Darwin lacks `accept4`, but does have `accept`. We define
+/// `SocketFlags` to have no flags, so we can discard it here.
+#[cfg(any(
+    apple,
+    windows,
+    target_os = "aix",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "vita",
+))]
+pub(crate) fn acceptfrom_with(
+    sockfd: BorrowedFd<'_>,
+    _flags: SocketFlags,
+) -> io::Result<(OwnedFd, Option<SocketAddrAny>)> {
+    acceptfrom(sockfd)
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn shutdown(sockfd: BorrowedFd<'_>, how: Shutdown) -> io::Result<()> {
+    unsafe { ret(c::shutdown(borrowed_fd(sockfd), how as c::c_int)) }
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn getsockname(sockfd: BorrowedFd<'_>) -> io::Result<SocketAddrAny> {
+    unsafe {
+        let mut storage = MaybeUninit::<c::sockaddr_storage>::uninit();
+        let mut len = size_of::<c::sockaddr_storage>() as c::socklen_t;
+        ret(c::getsockname(
+            borrowed_fd(sockfd),
+            storage.as_mut_ptr().cast(),
+            &mut len,
+        ))?;
+        Ok(read_sockaddr_os(storage.as_ptr(), len.try_into().unwrap()))
+    }
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+pub(crate) fn getpeername(sockfd: BorrowedFd<'_>) -> io::Result<Option<SocketAddrAny>> {
+    unsafe {
+        let mut storage = MaybeUninit::<c::sockaddr_storage>::uninit();
+        let mut len = size_of::<c::sockaddr_storage>() as c::socklen_t;
+        ret(c::getpeername(
+            borrowed_fd(sockfd),
+            storage.as_mut_ptr().cast(),
+            &mut len,
+        ))?;
+        Ok(maybe_read_sockaddr_os(
+            storage.as_ptr(),
+            len.try_into().unwrap(),
+        ))
+    }
+}
+
+#[cfg(not(any(windows, target_os = "redox", target_os = "wasi")))]
+pub(crate) fn socketpair(
+    domain: AddressFamily,
+    type_: SocketType,
+    flags: SocketFlags,
+    protocol: Option<Protocol>,
+) -> io::Result<(OwnedFd, OwnedFd)> {
+    let raw_protocol = match protocol {
+        Some(p) => p.0.get(),
+        None => 0,
+    };
+    unsafe {
+        let mut fds = MaybeUninit::<[OwnedFd; 2]>::uninit();
+        ret(c::socketpair(
+            c::c_int::from(domain.0),
+            (type_.0 | flags.bits()) as c::c_int,
+            raw_protocol as c::c_int,
+            fds.as_mut_ptr().cast::<c::c_int>(),
+        ))?;
+
+        let [fd0, fd1] = fds.assume_init();
+        Ok((fd0, fd1))
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/net/write_sockaddr.rs b/vendor/rustix/src/backend/libc/net/write_sockaddr.rs
new file mode 100644
index 0000000..2eee98c
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/write_sockaddr.rs
@@ -0,0 +1,103 @@
+//! The BSD sockets API requires us to read the `ss_family` field before we can
+//! interpret the rest of a `sockaddr` produced by the kernel.
+
+use super::addr::SocketAddrStorage;
+#[cfg(unix)]
+use super::addr::SocketAddrUnix;
+use super::ext::{in6_addr_new, in_addr_new, sockaddr_in6_new};
+use crate::backend::c;
+use crate::net::{SocketAddrAny, SocketAddrV4, SocketAddrV6};
+use core::mem::size_of;
+
+pub(crate) unsafe fn write_sockaddr(
+    addr: &SocketAddrAny,
+    storage: *mut SocketAddrStorage,
+) -> usize {
+    match addr {
+        SocketAddrAny::V4(v4) => write_sockaddr_v4(v4, storage),
+        SocketAddrAny::V6(v6) => write_sockaddr_v6(v6, storage),
+        #[cfg(unix)]
+        SocketAddrAny::Unix(unix) => write_sockaddr_unix(unix, storage),
+    }
+}
+
+pub(crate) fn encode_sockaddr_v4(v4: &SocketAddrV4) -> c::sockaddr_in {
+    c::sockaddr_in {
+        #[cfg(any(
+            bsd,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "vita",
+        ))]
+        sin_len: size_of::<c::sockaddr_in>() as _,
+        sin_family: c::AF_INET as _,
+        sin_port: u16::to_be(v4.port()),
+        sin_addr: in_addr_new(u32::from_ne_bytes(v4.ip().octets())),
+        #[cfg(not(any(target_os = "haiku", target_os = "vita")))]
+        sin_zero: [0; 8_usize],
+        #[cfg(target_os = "haiku")]
+        sin_zero: [0; 24_usize],
+        #[cfg(target_os = "vita")]
+        sin_zero: [0; 6_usize],
+        #[cfg(target_os = "vita")]
+        sin_vport: 0,
+    }
+}
+
+unsafe fn write_sockaddr_v4(v4: &SocketAddrV4, storage: *mut SocketAddrStorage) -> usize {
+    let encoded = encode_sockaddr_v4(v4);
+    core::ptr::write(storage.cast(), encoded);
+    size_of::<c::sockaddr_in>()
+}
+
+pub(crate) fn encode_sockaddr_v6(v6: &SocketAddrV6) -> c::sockaddr_in6 {
+    #[cfg(any(
+        bsd,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita"
+    ))]
+    {
+        sockaddr_in6_new(
+            size_of::<c::sockaddr_in6>() as _,
+            c::AF_INET6 as _,
+            u16::to_be(v6.port()),
+            u32::to_be(v6.flowinfo()),
+            in6_addr_new(v6.ip().octets()),
+            v6.scope_id(),
+        )
+    }
+    #[cfg(not(any(
+        bsd,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita"
+    )))]
+    {
+        sockaddr_in6_new(
+            c::AF_INET6 as _,
+            u16::to_be(v6.port()),
+            u32::to_be(v6.flowinfo()),
+            in6_addr_new(v6.ip().octets()),
+            v6.scope_id(),
+        )
+    }
+}
+
+unsafe fn write_sockaddr_v6(v6: &SocketAddrV6, storage: *mut SocketAddrStorage) -> usize {
+    let encoded = encode_sockaddr_v6(v6);
+    core::ptr::write(storage.cast(), encoded);
+    size_of::<c::sockaddr_in6>()
+}
+
+#[cfg(unix)]
+unsafe fn write_sockaddr_unix(unix: &SocketAddrUnix, storage: *mut SocketAddrStorage) -> usize {
+    core::ptr::write(storage.cast(), unix.unix);
+    unix.len()
+}
diff --git a/vendor/rustix/src/backend/libc/param/auxv.rs b/vendor/rustix/src/backend/libc/param/auxv.rs
new file mode 100644
index 0000000..880a1d4
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/param/auxv.rs
@@ -0,0 +1,54 @@
+use crate::backend::c;
+#[cfg(any(
+    all(target_os = "android", target_pointer_width = "64"),
+    target_os = "linux",
+))]
+use crate::ffi::CStr;
+
+// `getauxval` wasn't supported in glibc until 2.16.
+#[cfg(any(
+    all(target_os = "android", target_pointer_width = "64"),
+    target_os = "linux",
+))]
+weak!(fn getauxval(c::c_ulong) -> *mut c::c_void);
+
+#[inline]
+pub(crate) fn page_size() -> usize {
+    unsafe { c::sysconf(c::_SC_PAGESIZE) as usize }
+}
+
+#[cfg(not(any(target_os = "vita", target_os = "wasi")))]
+#[inline]
+pub(crate) fn clock_ticks_per_second() -> u64 {
+    unsafe { c::sysconf(c::_SC_CLK_TCK) as u64 }
+}
+
+#[cfg(any(
+    all(target_os = "android", target_pointer_width = "64"),
+    target_os = "linux",
+))]
+#[inline]
+pub(crate) fn linux_hwcap() -> (usize, usize) {
+    if let Some(libc_getauxval) = getauxval.get() {
+        unsafe {
+            let hwcap = libc_getauxval(c::AT_HWCAP) as usize;
+            let hwcap2 = libc_getauxval(c::AT_HWCAP2) as usize;
+            (hwcap, hwcap2)
+        }
+    } else {
+        (0, 0)
+    }
+}
+
+#[cfg(any(
+    all(target_os = "android", target_pointer_width = "64"),
+    target_os = "linux",
+))]
+#[inline]
+pub(crate) fn linux_execfn() -> &'static CStr {
+    if let Some(libc_getauxval) = getauxval.get() {
+        unsafe { CStr::from_ptr(libc_getauxval(c::AT_EXECFN).cast()) }
+    } else {
+        cstr!("")
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/param/mod.rs b/vendor/rustix/src/backend/libc/param/mod.rs
new file mode 100644
index 0000000..2cb2fe7
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/param/mod.rs
@@ -0,0 +1 @@
+pub(crate) mod auxv;
diff --git a/vendor/rustix/src/backend/libc/pid/mod.rs b/vendor/rustix/src/backend/libc/pid/mod.rs
new file mode 100644
index 0000000..ef944f0
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/pid/mod.rs
@@ -0,0 +1 @@
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/libc/pid/syscalls.rs b/vendor/rustix/src/backend/libc/pid/syscalls.rs
new file mode 100644
index 0000000..d0ed4bc
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/pid/syscalls.rs
@@ -0,0 +1,14 @@
+//! libc syscalls for PIDs
+
+use crate::backend::c;
+use crate::pid::Pid;
+
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+#[must_use]
+pub(crate) fn getpid() -> Pid {
+    unsafe {
+        let pid = c::getpid();
+        Pid::from_raw_unchecked(pid)
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/pipe/mod.rs b/vendor/rustix/src/backend/libc/pipe/mod.rs
new file mode 100644
index 0000000..1e0181a
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/pipe/mod.rs
@@ -0,0 +1,2 @@
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/libc/pipe/syscalls.rs b/vendor/rustix/src/backend/libc/pipe/syscalls.rs
new file mode 100644
index 0000000..cff932d
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/pipe/syscalls.rs
@@ -0,0 +1,125 @@
+use crate::backend::c;
+use crate::backend::conv::ret;
+use crate::fd::OwnedFd;
+use crate::io;
+#[cfg(not(any(
+    apple,
+    target_os = "aix",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "wasi"
+)))]
+use crate::pipe::PipeFlags;
+use core::mem::MaybeUninit;
+#[cfg(linux_kernel)]
+use {
+    crate::backend::conv::{borrowed_fd, ret_c_int, ret_usize},
+    crate::backend::MAX_IOV,
+    crate::fd::BorrowedFd,
+    crate::pipe::{IoSliceRaw, SpliceFlags},
+    crate::utils::option_as_mut_ptr,
+    core::cmp::min,
+};
+
+#[cfg(not(target_os = "wasi"))]
+pub(crate) fn pipe() -> io::Result<(OwnedFd, OwnedFd)> {
+    unsafe {
+        let mut result = MaybeUninit::<[OwnedFd; 2]>::uninit();
+        ret(c::pipe(result.as_mut_ptr().cast::<i32>()))?;
+        let [p0, p1] = result.assume_init();
+        Ok((p0, p1))
+    }
+}
+
+#[cfg(not(any(
+    apple,
+    target_os = "aix",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "wasi"
+)))]
+pub(crate) fn pipe_with(flags: PipeFlags) -> io::Result<(OwnedFd, OwnedFd)> {
+    unsafe {
+        let mut result = MaybeUninit::<[OwnedFd; 2]>::uninit();
+        ret(c::pipe2(
+            result.as_mut_ptr().cast::<i32>(),
+            bitflags_bits!(flags),
+        ))?;
+        let [p0, p1] = result.assume_init();
+        Ok((p0, p1))
+    }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub fn splice(
+    fd_in: BorrowedFd<'_>,
+    off_in: Option<&mut u64>,
+    fd_out: BorrowedFd<'_>,
+    off_out: Option<&mut u64>,
+    len: usize,
+    flags: SpliceFlags,
+) -> io::Result<usize> {
+    let off_in = option_as_mut_ptr(off_in).cast();
+    let off_out = option_as_mut_ptr(off_out).cast();
+
+    unsafe {
+        ret_usize(c::splice(
+            borrowed_fd(fd_in),
+            off_in,
+            borrowed_fd(fd_out),
+            off_out,
+            len,
+            flags.bits(),
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub unsafe fn vmsplice(
+    fd: BorrowedFd<'_>,
+    bufs: &[IoSliceRaw<'_>],
+    flags: SpliceFlags,
+) -> io::Result<usize> {
+    ret_usize(c::vmsplice(
+        borrowed_fd(fd),
+        bufs.as_ptr().cast::<c::iovec>(),
+        min(bufs.len(), MAX_IOV),
+        flags.bits(),
+    ))
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub fn tee(
+    fd_in: BorrowedFd<'_>,
+    fd_out: BorrowedFd<'_>,
+    len: usize,
+    flags: SpliceFlags,
+) -> io::Result<usize> {
+    unsafe {
+        ret_usize(c::tee(
+            borrowed_fd(fd_in),
+            borrowed_fd(fd_out),
+            len,
+            flags.bits(),
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn fcntl_getpipe_sz(fd: BorrowedFd<'_>) -> io::Result<usize> {
+    unsafe { ret_c_int(c::fcntl(borrowed_fd(fd), c::F_GETPIPE_SZ)).map(|size| size as usize) }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn fcntl_setpipe_sz(fd: BorrowedFd<'_>, size: usize) -> io::Result<()> {
+    let size: c::c_int = size.try_into().map_err(|_| io::Errno::PERM)?;
+
+    unsafe { ret(c::fcntl(borrowed_fd(fd), c::F_SETPIPE_SZ, size)) }
+}
diff --git a/vendor/rustix/src/backend/libc/pipe/types.rs b/vendor/rustix/src/backend/libc/pipe/types.rs
new file mode 100644
index 0000000..78fc2fc
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/pipe/types.rs
@@ -0,0 +1,103 @@
+#[cfg(linux_kernel)]
+use core::marker::PhantomData;
+#[cfg(not(any(apple, target_os = "wasi")))]
+use {crate::backend::c, bitflags::bitflags};
+
+#[cfg(not(any(apple, target_os = "wasi")))]
+bitflags! {
+    /// `O_*` constants for use with [`pipe_with`].
+    ///
+    /// [`pipe_with`]: crate::pipe::pipe_with
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct PipeFlags: u32 {
+        /// `O_CLOEXEC`
+        const CLOEXEC = bitcast!(c::O_CLOEXEC);
+        /// `O_DIRECT`
+        #[cfg(not(any(
+            solarish,
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "openbsd",
+            target_os = "redox",
+            target_os = "vita",
+        )))]
+        const DIRECT = bitcast!(c::O_DIRECT);
+        /// `O_NONBLOCK`
+        const NONBLOCK = bitcast!(c::O_NONBLOCK);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `SPLICE_F_*` constants for use with [`splice`], [`vmsplice`], and
+    /// [`tee`].
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct SpliceFlags: c::c_uint {
+        /// `SPLICE_F_MOVE`
+        const MOVE = c::SPLICE_F_MOVE;
+        /// `SPLICE_F_NONBLOCK`
+        const NONBLOCK = c::SPLICE_F_NONBLOCK;
+        /// `SPLICE_F_MORE`
+        const MORE = c::SPLICE_F_MORE;
+        /// `SPLICE_F_GIFT`
+        const GIFT = c::SPLICE_F_GIFT;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// A buffer type for use with [`vmsplice`].
+///
+/// It is guaranteed to be ABI compatible with the iovec type on Unix platforms
+/// and `WSABUF` on Windows. Unlike `IoSlice` and `IoSliceMut` it is
+/// semantically like a raw pointer, and therefore can be shared or mutated as
+/// needed.
+///
+/// [`vmsplice`]: crate::pipe::vmsplice
+#[cfg(linux_kernel)]
+#[repr(transparent)]
+pub struct IoSliceRaw<'a> {
+    _buf: c::iovec,
+    _lifetime: PhantomData<&'a ()>,
+}
+
+#[cfg(linux_kernel)]
+impl<'a> IoSliceRaw<'a> {
+    /// Creates a new `IoSlice` wrapping a byte slice.
+    pub fn from_slice(buf: &'a [u8]) -> Self {
+        IoSliceRaw {
+            _buf: c::iovec {
+                iov_base: buf.as_ptr() as *mut u8 as *mut c::c_void,
+                iov_len: buf.len() as _,
+            },
+            _lifetime: PhantomData,
+        }
+    }
+
+    /// Creates a new `IoSlice` wrapping a mutable byte slice.
+    pub fn from_slice_mut(buf: &'a mut [u8]) -> Self {
+        IoSliceRaw {
+            _buf: c::iovec {
+                iov_base: buf.as_mut_ptr() as *mut c::c_void,
+                iov_len: buf.len() as _,
+            },
+            _lifetime: PhantomData,
+        }
+    }
+}
+
+#[cfg(not(any(apple, target_os = "wasi")))]
+#[test]
+fn test_types() {
+    assert_eq_size!(PipeFlags, c::c_int);
+
+    #[cfg(linux_kernel)]
+    assert_eq_size!(SpliceFlags, c::c_int);
+}
diff --git a/vendor/rustix/src/backend/libc/prctl/mod.rs b/vendor/rustix/src/backend/libc/prctl/mod.rs
new file mode 100644
index 0000000..ef944f0
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/prctl/mod.rs
@@ -0,0 +1 @@
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/libc/prctl/syscalls.rs b/vendor/rustix/src/backend/libc/prctl/syscalls.rs
new file mode 100644
index 0000000..451cecc
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/prctl/syscalls.rs
@@ -0,0 +1,14 @@
+use crate::backend::c;
+use crate::backend::conv::ret_c_int;
+use crate::io;
+
+#[inline]
+pub(crate) unsafe fn prctl(
+    option: c::c_int,
+    arg2: *mut c::c_void,
+    arg3: *mut c::c_void,
+    arg4: *mut c::c_void,
+    arg5: *mut c::c_void,
+) -> io::Result<c::c_int> {
+    ret_c_int(c::prctl(option, arg2, arg3, arg4, arg5))
+}
diff --git a/vendor/rustix/src/backend/libc/process/cpu_set.rs b/vendor/rustix/src/backend/libc/process/cpu_set.rs
new file mode 100644
index 0000000..4cf06b9
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/process/cpu_set.rs
@@ -0,0 +1,50 @@
+//! Rust implementation of the `CPU_*` macro API.
+
+#![allow(non_snake_case)]
+
+use super::types::{RawCpuSet, CPU_SETSIZE};
+use crate::backend::c;
+
+#[inline]
+pub(crate) fn CPU_SET(cpu: usize, cpuset: &mut RawCpuSet) {
+    assert!(
+        cpu < CPU_SETSIZE,
+        "cpu out of bounds: the cpu max is {} but the cpu is {}",
+        CPU_SETSIZE,
+        cpu
+    );
+    unsafe { c::CPU_SET(cpu, cpuset) }
+}
+
+#[inline]
+pub(crate) fn CPU_ZERO(cpuset: &mut RawCpuSet) {
+    unsafe { c::CPU_ZERO(cpuset) }
+}
+
+#[inline]
+pub(crate) fn CPU_CLR(cpu: usize, cpuset: &mut RawCpuSet) {
+    assert!(
+        cpu < CPU_SETSIZE,
+        "cpu out of bounds: the cpu max is {} but the cpu is {}",
+        CPU_SETSIZE,
+        cpu
+    );
+    unsafe { c::CPU_CLR(cpu, cpuset) }
+}
+
+#[inline]
+pub(crate) fn CPU_ISSET(cpu: usize, cpuset: &RawCpuSet) -> bool {
+    assert!(
+        cpu < CPU_SETSIZE,
+        "cpu out of bounds: the cpu max is {} but the cpu is {}",
+        CPU_SETSIZE,
+        cpu
+    );
+    unsafe { c::CPU_ISSET(cpu, cpuset) }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn CPU_COUNT(cpuset: &RawCpuSet) -> u32 {
+    unsafe { c::CPU_COUNT(cpuset).try_into().unwrap() }
+}
diff --git a/vendor/rustix/src/backend/libc/process/mod.rs b/vendor/rustix/src/backend/libc/process/mod.rs
new file mode 100644
index 0000000..39803b5
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/process/mod.rs
@@ -0,0 +1,7 @@
+#[cfg(any(freebsdlike, linux_kernel, target_os = "fuchsia"))]
+pub(crate) mod cpu_set;
+#[cfg(not(windows))]
+pub(crate) mod syscalls;
+pub(crate) mod types;
+#[cfg(not(any(target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+pub(crate) mod wait;
diff --git a/vendor/rustix/src/backend/libc/process/syscalls.rs b/vendor/rustix/src/backend/libc/process/syscalls.rs
new file mode 100644
index 0000000..46fd182
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/process/syscalls.rs
@@ -0,0 +1,713 @@
+//! libc syscalls supporting `rustix::process`.
+
+#[cfg(any(freebsdlike, linux_kernel, target_os = "fuchsia"))]
+use super::types::RawCpuSet;
+use crate::backend::c;
+#[cfg(not(any(target_os = "wasi", target_os = "fuchsia")))]
+use crate::backend::conv::borrowed_fd;
+#[cfg(feature = "fs")]
+use crate::backend::conv::c_str;
+#[cfg(all(feature = "alloc", feature = "fs", not(target_os = "wasi")))]
+use crate::backend::conv::ret_discarded_char_ptr;
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+use crate::backend::conv::ret_infallible;
+#[cfg(not(target_os = "wasi"))]
+use crate::backend::conv::ret_pid_t;
+#[cfg(linux_kernel)]
+use crate::backend::conv::ret_u32;
+#[cfg(all(feature = "alloc", not(target_os = "wasi")))]
+use crate::backend::conv::ret_usize;
+use crate::backend::conv::{ret, ret_c_int};
+#[cfg(not(any(target_os = "wasi", target_os = "fuchsia")))]
+use crate::fd::BorrowedFd;
+#[cfg(target_os = "linux")]
+use crate::fd::{AsRawFd, OwnedFd, RawFd};
+#[cfg(feature = "fs")]
+use crate::ffi::CStr;
+#[cfg(feature = "fs")]
+use crate::fs::Mode;
+use crate::io;
+#[cfg(all(feature = "alloc", not(target_os = "wasi")))]
+use crate::process::Gid;
+#[cfg(not(target_os = "wasi"))]
+use crate::process::Pid;
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+use crate::process::Signal;
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+use crate::process::Uid;
+#[cfg(linux_kernel)]
+use crate::process::{Cpuid, MembarrierCommand, MembarrierQuery};
+#[cfg(not(any(target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+use crate::process::{RawPid, WaitOptions, WaitStatus};
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+use crate::process::{Resource, Rlimit};
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "openbsd",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+use crate::process::{WaitId, WaitidOptions, WaitidStatus};
+use core::mem::MaybeUninit;
+#[cfg(target_os = "linux")]
+use {
+    super::super::conv::ret_owned_fd, crate::process::PidfdFlags, crate::process::PidfdGetfdFlags,
+};
+
+#[cfg(any(linux_kernel, target_os = "dragonfly"))]
+#[inline]
+pub(crate) fn sched_getcpu() -> usize {
+    let r = unsafe { libc::sched_getcpu() };
+    debug_assert!(r >= 0);
+    r as usize
+}
+
+#[cfg(feature = "fs")]
+#[cfg(not(target_os = "wasi"))]
+pub(crate) fn chdir(path: &CStr) -> io::Result<()> {
+    unsafe { ret(c::chdir(c_str(path))) }
+}
+
+#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))]
+pub(crate) fn fchdir(dirfd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe { ret(c::fchdir(borrowed_fd(dirfd))) }
+}
+
+#[cfg(feature = "fs")]
+#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))]
+pub(crate) fn chroot(path: &CStr) -> io::Result<()> {
+    unsafe { ret(c::chroot(c_str(path))) }
+}
+
+#[cfg(all(feature = "alloc", feature = "fs"))]
+#[cfg(not(target_os = "wasi"))]
+pub(crate) fn getcwd(buf: &mut [MaybeUninit<u8>]) -> io::Result<()> {
+    unsafe { ret_discarded_char_ptr(c::getcwd(buf.as_mut_ptr().cast(), buf.len())) }
+}
+
+// The `membarrier` syscall has a third argument, but it's only used when
+// the `flags` argument is `MEMBARRIER_CMD_FLAG_CPU`.
+#[cfg(linux_kernel)]
+syscall! {
+    fn membarrier_all(
+        cmd: c::c_int,
+        flags: c::c_uint
+    ) via SYS_membarrier -> c::c_int
+}
+
+#[cfg(linux_kernel)]
+pub(crate) fn membarrier_query() -> MembarrierQuery {
+    // glibc does not have a wrapper for `membarrier`; [the documentation]
+    // says to use `syscall`.
+    //
+    // [the documentation]: https://man7.org/linux/man-pages/man2/membarrier.2.html#NOTES
+    const MEMBARRIER_CMD_QUERY: u32 = 0;
+    unsafe {
+        match ret_u32(membarrier_all(MEMBARRIER_CMD_QUERY as i32, 0)) {
+            Ok(query) => MembarrierQuery::from_bits_retain(query),
+            Err(_) => MembarrierQuery::empty(),
+        }
+    }
+}
+
+#[cfg(linux_kernel)]
+pub(crate) fn membarrier(cmd: MembarrierCommand) -> io::Result<()> {
+    unsafe { ret(membarrier_all(cmd as i32, 0)) }
+}
+
+#[cfg(linux_kernel)]
+pub(crate) fn membarrier_cpu(cmd: MembarrierCommand, cpu: Cpuid) -> io::Result<()> {
+    const MEMBARRIER_CMD_FLAG_CPU: u32 = 1;
+
+    syscall! {
+        fn membarrier_cpu(
+            cmd: c::c_int,
+            flags: c::c_uint,
+            cpu_id: c::c_int
+        ) via SYS_membarrier -> c::c_int
+    }
+
+    unsafe {
+        ret(membarrier_cpu(
+            cmd as i32,
+            MEMBARRIER_CMD_FLAG_CPU,
+            bitcast!(cpu.as_raw()),
+        ))
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+#[must_use]
+pub(crate) fn getppid() -> Option<Pid> {
+    unsafe {
+        let pid: i32 = c::getppid();
+        Pid::from_raw(pid)
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub(crate) fn getpgid(pid: Option<Pid>) -> io::Result<Pid> {
+    unsafe {
+        let pgid = ret_pid_t(c::getpgid(Pid::as_raw(pid) as _))?;
+        Ok(Pid::from_raw_unchecked(pgid))
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub(crate) fn setpgid(pid: Option<Pid>, pgid: Option<Pid>) -> io::Result<()> {
+    unsafe { ret(c::setpgid(Pid::as_raw(pid) as _, Pid::as_raw(pgid) as _)) }
+}
+
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+#[must_use]
+pub(crate) fn getpgrp() -> Pid {
+    unsafe {
+        let pgid = c::getpgrp();
+        Pid::from_raw_unchecked(pgid)
+    }
+}
+
+#[cfg(any(freebsdlike, linux_kernel, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn sched_getaffinity(pid: Option<Pid>, cpuset: &mut RawCpuSet) -> io::Result<()> {
+    unsafe {
+        ret(c::sched_getaffinity(
+            Pid::as_raw(pid) as _,
+            core::mem::size_of::<RawCpuSet>(),
+            cpuset,
+        ))
+    }
+}
+
+#[cfg(any(freebsdlike, linux_kernel, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn sched_setaffinity(pid: Option<Pid>, cpuset: &RawCpuSet) -> io::Result<()> {
+    unsafe {
+        ret(c::sched_setaffinity(
+            Pid::as_raw(pid) as _,
+            core::mem::size_of::<RawCpuSet>(),
+            cpuset,
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn sched_yield() {
+    unsafe {
+        let _ = c::sched_yield();
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+#[cfg(feature = "fs")]
+#[inline]
+pub(crate) fn umask(mask: Mode) -> Mode {
+    unsafe { Mode::from_bits_retain(c::umask(mask.bits() as c::mode_t).into()) }
+}
+
+#[cfg(not(any(target_os = "fuchsia", target_os = "vita", target_os = "wasi")))]
+#[inline]
+pub(crate) fn nice(inc: i32) -> io::Result<i32> {
+    libc_errno::set_errno(libc_errno::Errno(0));
+    let r = unsafe { c::nice(inc) };
+    if libc_errno::errno().0 != 0 {
+        ret_c_int(r)
+    } else {
+        Ok(r)
+    }
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+pub(crate) fn getpriority_user(uid: Uid) -> io::Result<i32> {
+    libc_errno::set_errno(libc_errno::Errno(0));
+    let r = unsafe { c::getpriority(c::PRIO_USER, uid.as_raw() as _) };
+    if libc_errno::errno().0 != 0 {
+        ret_c_int(r)
+    } else {
+        Ok(r)
+    }
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+pub(crate) fn getpriority_pgrp(pgid: Option<Pid>) -> io::Result<i32> {
+    libc_errno::set_errno(libc_errno::Errno(0));
+    let r = unsafe { c::getpriority(c::PRIO_PGRP, Pid::as_raw(pgid) as _) };
+    if libc_errno::errno().0 != 0 {
+        ret_c_int(r)
+    } else {
+        Ok(r)
+    }
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+pub(crate) fn getpriority_process(pid: Option<Pid>) -> io::Result<i32> {
+    libc_errno::set_errno(libc_errno::Errno(0));
+    let r = unsafe { c::getpriority(c::PRIO_PROCESS, Pid::as_raw(pid) as _) };
+    if libc_errno::errno().0 != 0 {
+        ret_c_int(r)
+    } else {
+        Ok(r)
+    }
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+pub(crate) fn setpriority_user(uid: Uid, priority: i32) -> io::Result<()> {
+    unsafe { ret(c::setpriority(c::PRIO_USER, uid.as_raw() as _, priority)) }
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+pub(crate) fn setpriority_pgrp(pgid: Option<Pid>, priority: i32) -> io::Result<()> {
+    unsafe {
+        ret(c::setpriority(
+            c::PRIO_PGRP,
+            Pid::as_raw(pgid) as _,
+            priority,
+        ))
+    }
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+pub(crate) fn setpriority_process(pid: Option<Pid>, priority: i32) -> io::Result<()> {
+    unsafe {
+        ret(c::setpriority(
+            c::PRIO_PROCESS,
+            Pid::as_raw(pid) as _,
+            priority,
+        ))
+    }
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+pub(crate) fn getrlimit(limit: Resource) -> Rlimit {
+    let mut result = MaybeUninit::<c::rlimit>::uninit();
+    unsafe {
+        ret_infallible(c::getrlimit(limit as _, result.as_mut_ptr()));
+        rlimit_from_libc(result.assume_init())
+    }
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+pub(crate) fn setrlimit(limit: Resource, new: Rlimit) -> io::Result<()> {
+    let lim = rlimit_to_libc(new)?;
+    unsafe { ret(c::setrlimit(limit as _, &lim)) }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn prlimit(pid: Option<Pid>, limit: Resource, new: Rlimit) -> io::Result<Rlimit> {
+    let lim = rlimit_to_libc(new)?;
+    let mut result = MaybeUninit::<c::rlimit>::uninit();
+    unsafe {
+        ret(c::prlimit(
+            Pid::as_raw(pid),
+            limit as _,
+            &lim,
+            result.as_mut_ptr(),
+        ))?;
+        Ok(rlimit_from_libc(result.assume_init()))
+    }
+}
+
+/// Convert a Rust [`Rlimit`] to a C `c::rlimit`.
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+fn rlimit_from_libc(lim: c::rlimit) -> Rlimit {
+    let current = if lim.rlim_cur == c::RLIM_INFINITY {
+        None
+    } else {
+        Some(lim.rlim_cur.try_into().unwrap())
+    };
+    let maximum = if lim.rlim_max == c::RLIM_INFINITY {
+        None
+    } else {
+        Some(lim.rlim_max.try_into().unwrap())
+    };
+    Rlimit { current, maximum }
+}
+
+/// Convert a C `c::rlimit` to a Rust `Rlimit`.
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+fn rlimit_to_libc(lim: Rlimit) -> io::Result<c::rlimit> {
+    let Rlimit { current, maximum } = lim;
+    let rlim_cur = match current {
+        Some(r) => r.try_into().map_err(|_e| io::Errno::INVAL)?,
+        None => c::RLIM_INFINITY as _,
+    };
+    let rlim_max = match maximum {
+        Some(r) => r.try_into().map_err(|_e| io::Errno::INVAL)?,
+        None => c::RLIM_INFINITY as _,
+    };
+    Ok(c::rlimit { rlim_cur, rlim_max })
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+#[inline]
+pub(crate) fn wait(waitopts: WaitOptions) -> io::Result<Option<(Pid, WaitStatus)>> {
+    _waitpid(!0, waitopts)
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+#[inline]
+pub(crate) fn waitpid(
+    pid: Option<Pid>,
+    waitopts: WaitOptions,
+) -> io::Result<Option<(Pid, WaitStatus)>> {
+    _waitpid(Pid::as_raw(pid), waitopts)
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+#[inline]
+pub(crate) fn waitpgid(pgid: Pid, waitopts: WaitOptions) -> io::Result<Option<(Pid, WaitStatus)>> {
+    _waitpid(-pgid.as_raw_nonzero().get(), waitopts)
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+#[inline]
+pub(crate) fn _waitpid(
+    pid: RawPid,
+    waitopts: WaitOptions,
+) -> io::Result<Option<(Pid, WaitStatus)>> {
+    unsafe {
+        let mut status: c::c_int = 0;
+        let pid = ret_c_int(c::waitpid(pid as _, &mut status, waitopts.bits() as _))?;
+        Ok(Pid::from_raw(pid).map(|pid| (pid, WaitStatus::new(status as _))))
+    }
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "openbsd",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+pub(crate) fn waitid(id: WaitId<'_>, options: WaitidOptions) -> io::Result<Option<WaitidStatus>> {
+    // Get the id to wait on.
+    match id {
+        WaitId::All => _waitid_all(options),
+        WaitId::Pid(pid) => _waitid_pid(pid, options),
+        WaitId::Pgid(pgid) => _waitid_pgid(pgid, options),
+        #[cfg(target_os = "linux")]
+        WaitId::PidFd(fd) => _waitid_pidfd(fd, options),
+        #[cfg(not(target_os = "linux"))]
+        WaitId::__EatLifetime(_) => unreachable!(),
+    }
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "openbsd",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+fn _waitid_all(options: WaitidOptions) -> io::Result<Option<WaitidStatus>> {
+    // `waitid` can return successfully without initializing the struct (no
+    // children found when using `WNOHANG`)
+    let mut status = MaybeUninit::<c::siginfo_t>::zeroed();
+    unsafe {
+        ret(c::waitid(
+            c::P_ALL,
+            0,
+            status.as_mut_ptr(),
+            options.bits() as _,
+        ))?
+    };
+
+    Ok(unsafe { cvt_waitid_status(status) })
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "openbsd",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+fn _waitid_pid(pid: Pid, options: WaitidOptions) -> io::Result<Option<WaitidStatus>> {
+    // `waitid` can return successfully without initializing the struct (no
+    // children found when using `WNOHANG`)
+    let mut status = MaybeUninit::<c::siginfo_t>::zeroed();
+    unsafe {
+        ret(c::waitid(
+            c::P_PID,
+            Pid::as_raw(Some(pid)) as _,
+            status.as_mut_ptr(),
+            options.bits() as _,
+        ))?
+    };
+
+    Ok(unsafe { cvt_waitid_status(status) })
+}
+
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "openbsd",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+fn _waitid_pgid(pgid: Option<Pid>, options: WaitidOptions) -> io::Result<Option<WaitidStatus>> {
+    // `waitid` can return successfully without initializing the struct (no
+    // children found when using `WNOHANG`)
+    let mut status = MaybeUninit::<c::siginfo_t>::zeroed();
+    unsafe {
+        ret(c::waitid(
+            c::P_PGID,
+            Pid::as_raw(pgid) as _,
+            status.as_mut_ptr(),
+            options.bits() as _,
+        ))?
+    };
+
+    Ok(unsafe { cvt_waitid_status(status) })
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+fn _waitid_pidfd(fd: BorrowedFd<'_>, options: WaitidOptions) -> io::Result<Option<WaitidStatus>> {
+    // `waitid` can return successfully without initializing the struct (no
+    // children found when using `WNOHANG`)
+    let mut status = MaybeUninit::<c::siginfo_t>::zeroed();
+    unsafe {
+        ret(c::waitid(
+            c::P_PIDFD,
+            fd.as_raw_fd() as _,
+            status.as_mut_ptr(),
+            options.bits() as _,
+        ))?
+    };
+
+    Ok(unsafe { cvt_waitid_status(status) })
+}
+
+/// Convert a `siginfo_t` to a `WaitidStatus`.
+///
+/// # Safety
+///
+/// The caller must ensure that `status` is initialized and that `waitid`
+/// returned successfully.
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "openbsd",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+unsafe fn cvt_waitid_status(status: MaybeUninit<c::siginfo_t>) -> Option<WaitidStatus> {
+    let status = status.assume_init();
+    // `si_pid` is supposedly the better way to check that the struct has been
+    // filled, e.g. the Linux manpage says about the `WNOHANG` case “zero out
+    // the si_pid field before the call and check for a nonzero value”.
+    // But e.g. NetBSD/OpenBSD don't have it exposed in the libc crate for now,
+    // and some platforms don't have it at all. For simplicity, always check
+    // `si_signo`. We have zero-initialized the whole struct, and all kernels
+    // should set `SIGCHLD` here.
+    if status.si_signo == 0 {
+        None
+    } else {
+        Some(WaitidStatus(status))
+    }
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+#[inline]
+pub(crate) fn getsid(pid: Option<Pid>) -> io::Result<Pid> {
+    unsafe {
+        let pid = ret_pid_t(c::getsid(Pid::as_raw(pid) as _))?;
+        Ok(Pid::from_raw_unchecked(pid))
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub(crate) fn setsid() -> io::Result<Pid> {
+    unsafe {
+        let pid = ret_c_int(c::setsid())?;
+        Ok(Pid::from_raw_unchecked(pid))
+    }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+#[inline]
+pub(crate) fn kill_process(pid: Pid, sig: Signal) -> io::Result<()> {
+    unsafe { ret(c::kill(pid.as_raw_nonzero().get(), sig as i32)) }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+#[inline]
+pub(crate) fn kill_process_group(pid: Pid, sig: Signal) -> io::Result<()> {
+    unsafe {
+        ret(c::kill(
+            pid.as_raw_nonzero().get().wrapping_neg(),
+            sig as i32,
+        ))
+    }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+#[inline]
+pub(crate) fn kill_current_process_group(sig: Signal) -> io::Result<()> {
+    unsafe { ret(c::kill(0, sig as i32)) }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+pub(crate) fn test_kill_process(pid: Pid) -> io::Result<()> {
+    unsafe { ret(c::kill(pid.as_raw_nonzero().get(), 0)) }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+#[inline]
+pub(crate) fn test_kill_process_group(pid: Pid) -> io::Result<()> {
+    unsafe { ret(c::kill(pid.as_raw_nonzero().get().wrapping_neg(), 0)) }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+#[inline]
+pub(crate) fn test_kill_current_process_group() -> io::Result<()> {
+    unsafe { ret(c::kill(0, 0)) }
+}
+
+#[cfg(freebsdlike)]
+#[inline]
+pub(crate) unsafe fn procctl(
+    idtype: c::idtype_t,
+    id: c::id_t,
+    option: c::c_int,
+    data: *mut c::c_void,
+) -> io::Result<()> {
+    ret(c::procctl(idtype, id, option, data))
+}
+
+#[cfg(target_os = "linux")]
+pub(crate) fn pidfd_open(pid: Pid, flags: PidfdFlags) -> io::Result<OwnedFd> {
+    syscall! {
+        fn pidfd_open(
+            pid: c::pid_t,
+            flags: c::c_uint
+        ) via SYS_pidfd_open -> c::c_int
+    }
+    unsafe {
+        ret_owned_fd(pidfd_open(
+            pid.as_raw_nonzero().get(),
+            bitflags_bits!(flags),
+        ))
+    }
+}
+
+#[cfg(target_os = "linux")]
+pub(crate) fn pidfd_getfd(
+    pidfd: BorrowedFd<'_>,
+    targetfd: RawFd,
+    flags: PidfdGetfdFlags,
+) -> io::Result<OwnedFd> {
+    syscall! {
+        fn pidfd_getfd(
+            pidfd: c::c_int,
+            targetfd: c::c_int,
+            flags: c::c_uint
+        ) via SYS_pidfd_getfd -> c::c_int
+    }
+    unsafe {
+        ret_owned_fd(pidfd_getfd(
+            borrowed_fd(pidfd),
+            targetfd,
+            bitflags_bits!(flags),
+        ))
+    }
+}
+
+#[cfg(all(feature = "alloc", not(target_os = "wasi")))]
+pub(crate) fn getgroups(buf: &mut [Gid]) -> io::Result<usize> {
+    let len = buf.len().try_into().map_err(|_| io::Errno::NOMEM)?;
+
+    unsafe { ret_usize(c::getgroups(len, buf.as_mut_ptr().cast()) as isize) }
+}
diff --git a/vendor/rustix/src/backend/libc/process/types.rs b/vendor/rustix/src/backend/libc/process/types.rs
new file mode 100644
index 0000000..f914128
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/process/types.rs
@@ -0,0 +1,172 @@
+#[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+use crate::backend::c;
+
+/// A command for use with [`membarrier`] and [`membarrier_cpu`].
+///
+/// For `MEMBARRIER_CMD_QUERY`, see [`membarrier_query`].
+///
+/// [`membarrier`]: crate::process::membarrier
+/// [`membarrier_cpu`]: crate::process::membarrier_cpu
+/// [`membarrier_query`]: crate::process::membarrier_query
+#[cfg(linux_kernel)]
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
+#[repr(u32)]
+pub enum MembarrierCommand {
+    /// `MEMBARRIER_CMD_GLOBAL`
+    #[doc(alias = "Shared")]
+    #[doc(alias = "MEMBARRIER_CMD_SHARED")]
+    Global = c::MEMBARRIER_CMD_GLOBAL as u32,
+    /// `MEMBARRIER_CMD_GLOBAL_EXPEDITED`
+    GlobalExpedited = c::MEMBARRIER_CMD_GLOBAL_EXPEDITED as u32,
+    /// `MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED`
+    RegisterGlobalExpedited = c::MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED as u32,
+    /// `MEMBARRIER_CMD_PRIVATE_EXPEDITED`
+    PrivateExpedited = c::MEMBARRIER_CMD_PRIVATE_EXPEDITED as u32,
+    /// `MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED`
+    RegisterPrivateExpedited = c::MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED as u32,
+    /// `MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE`
+    PrivateExpeditedSyncCore = c::MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE as u32,
+    /// `MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE`
+    RegisterPrivateExpeditedSyncCore =
+        c::MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE as u32,
+    /// `MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ` (since Linux 5.10)
+    PrivateExpeditedRseq = c::MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ as u32,
+    /// `MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_RSEQ` (since Linux 5.10)
+    RegisterPrivateExpeditedRseq = c::MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_RSEQ as u32,
+}
+
+/// A resource value for use with [`getrlimit`], [`setrlimit`], and
+/// [`prlimit`].
+///
+/// [`getrlimit`]: crate::process::getrlimit
+/// [`setrlimit`]: crate::process::setrlimit
+/// [`prlimit`]: crate::process::prlimit
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(not(target_os = "l4re"), repr(u32))]
+#[cfg_attr(target_os = "l4re", repr(u64))]
+pub enum Resource {
+    /// `RLIMIT_CPU`
+    Cpu = bitcast!(c::RLIMIT_CPU),
+    /// `RLIMIT_FSIZE`
+    Fsize = bitcast!(c::RLIMIT_FSIZE),
+    /// `RLIMIT_DATA`
+    Data = bitcast!(c::RLIMIT_DATA),
+    /// `RLIMIT_STACK`
+    Stack = bitcast!(c::RLIMIT_STACK),
+    /// `RLIMIT_CORE`
+    #[cfg(not(target_os = "haiku"))]
+    Core = bitcast!(c::RLIMIT_CORE),
+    /// `RLIMIT_RSS`
+    // "nto" has `RLIMIT_RSS`, but it has the same value as `RLIMIT_AS`.
+    #[cfg(not(any(apple, solarish, target_os = "nto", target_os = "haiku")))]
+    Rss = bitcast!(c::RLIMIT_RSS),
+    /// `RLIMIT_NPROC`
+    #[cfg(not(any(solarish, target_os = "haiku")))]
+    Nproc = bitcast!(c::RLIMIT_NPROC),
+    /// `RLIMIT_NOFILE`
+    Nofile = bitcast!(c::RLIMIT_NOFILE),
+    /// `RLIMIT_MEMLOCK`
+    #[cfg(not(any(solarish, target_os = "aix", target_os = "haiku")))]
+    Memlock = bitcast!(c::RLIMIT_MEMLOCK),
+    /// `RLIMIT_AS`
+    #[cfg(not(target_os = "openbsd"))]
+    As = bitcast!(c::RLIMIT_AS),
+    /// `RLIMIT_LOCKS`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        target_os = "aix",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "nto"
+    )))]
+    Locks = bitcast!(c::RLIMIT_LOCKS),
+    /// `RLIMIT_SIGPENDING`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        target_os = "aix",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "nto"
+    )))]
+    Sigpending = bitcast!(c::RLIMIT_SIGPENDING),
+    /// `RLIMIT_MSGQUEUE`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        target_os = "aix",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "nto"
+    )))]
+    Msgqueue = bitcast!(c::RLIMIT_MSGQUEUE),
+    /// `RLIMIT_NICE`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        target_os = "aix",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "nto"
+    )))]
+    Nice = bitcast!(c::RLIMIT_NICE),
+    /// `RLIMIT_RTPRIO`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        target_os = "aix",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "nto"
+    )))]
+    Rtprio = bitcast!(c::RLIMIT_RTPRIO),
+    /// `RLIMIT_RTTIME`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        target_os = "aix",
+        target_os = "android",
+        target_os = "emscripten",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "nto",
+    )))]
+    Rttime = bitcast!(c::RLIMIT_RTTIME),
+}
+
+#[cfg(apple)]
+#[allow(non_upper_case_globals)]
+impl Resource {
+    /// `RLIMIT_RSS`
+    pub const Rss: Self = Self::As;
+}
+
+/// A CPU identifier as a raw integer.
+#[cfg(linux_kernel)]
+pub type RawCpuid = u32;
+#[cfg(freebsdlike)]
+pub type RawId = c::id_t;
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+pub(crate) type RawCpuSet = c::cpu_set_t;
+#[cfg(freebsdlike)]
+pub(crate) type RawCpuSet = c::cpuset_t;
+
+#[cfg(any(freebsdlike, linux_kernel, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn raw_cpu_set_new() -> RawCpuSet {
+    let mut set = unsafe { core::mem::zeroed() };
+    super::cpu_set::CPU_ZERO(&mut set);
+    set
+}
+
+#[cfg(any(freebsdlike, linux_kernel, target_os = "fuchsia"))]
+pub(crate) const CPU_SETSIZE: usize = c::CPU_SETSIZE as usize;
diff --git a/vendor/rustix/src/backend/libc/process/wait.rs b/vendor/rustix/src/backend/libc/process/wait.rs
new file mode 100644
index 0000000..9a932cf
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/process/wait.rs
@@ -0,0 +1,9 @@
+use crate::backend::c;
+
+pub(crate) use c::{
+    WCONTINUED, WEXITSTATUS, WIFCONTINUED, WIFEXITED, WIFSIGNALED, WIFSTOPPED, WNOHANG, WSTOPSIG,
+    WTERMSIG, WUNTRACED,
+};
+
+#[cfg(not(any(target_os = "openbsd", target_os = "redox", target_os = "wasi")))]
+pub(crate) use c::{WEXITED, WNOWAIT, WSTOPPED};
diff --git a/vendor/rustix/src/backend/libc/pty/mod.rs b/vendor/rustix/src/backend/libc/pty/mod.rs
new file mode 100644
index 0000000..ef944f0
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/pty/mod.rs
@@ -0,0 +1 @@
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/libc/pty/syscalls.rs b/vendor/rustix/src/backend/libc/pty/syscalls.rs
new file mode 100644
index 0000000..2395efd
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/pty/syscalls.rs
@@ -0,0 +1,106 @@
+//! libc syscalls supporting `rustix::pty`.
+
+use crate::backend::c;
+use crate::backend::conv::{borrowed_fd, ret};
+use crate::fd::BorrowedFd;
+use crate::io;
+#[cfg(all(
+    feature = "alloc",
+    any(apple, linux_like, target_os = "freebsd", target_os = "fuchsia")
+))]
+use {
+    crate::ffi::{CStr, CString},
+    crate::path::SMALL_PATH_BUFFER_SIZE,
+    alloc::borrow::ToOwned,
+    alloc::vec::Vec,
+};
+
+#[cfg(not(linux_kernel))]
+use crate::{backend::conv::ret_owned_fd, fd::OwnedFd, pty::OpenptFlags};
+
+#[cfg(not(linux_kernel))]
+#[inline]
+pub(crate) fn openpt(flags: OpenptFlags) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(c::posix_openpt(flags.bits() as _)) }
+}
+
+#[cfg(all(
+    feature = "alloc",
+    any(apple, linux_like, target_os = "freebsd", target_os = "fuchsia")
+))]
+#[inline]
+pub(crate) fn ptsname(fd: BorrowedFd<'_>, mut buffer: Vec<u8>) -> io::Result<CString> {
+    // This code would benefit from having a better way to read into
+    // uninitialized memory, but that requires `unsafe`.
+    buffer.clear();
+    buffer.reserve(SMALL_PATH_BUFFER_SIZE);
+    buffer.resize(buffer.capacity(), 0_u8);
+
+    loop {
+        // On platforms with `ptsname_r`, use it.
+        #[cfg(any(linux_like, target_os = "fuchsia"))]
+        let r = unsafe { c::ptsname_r(borrowed_fd(fd), buffer.as_mut_ptr().cast(), buffer.len()) };
+
+        // FreeBSD 12 doesn't have `ptsname_r`.
+        #[cfg(target_os = "freebsd")]
+        let r = unsafe {
+            weak! {
+                fn ptsname_r(
+                     c::c_int,
+                     *mut c::c_char,
+                     c::size_t
+                ) -> c::c_int
+            }
+            if let Some(func) = ptsname_r.get() {
+                func(borrowed_fd(fd), buffer.as_mut_ptr().cast(), buffer.len())
+            } else {
+                libc::ENOSYS
+            }
+        };
+
+        // macOS 10.13.4 has `ptsname_r`; use it if we have it, otherwise fall
+        // back to calling the underlying ioctl directly.
+        #[cfg(apple)]
+        let r = unsafe {
+            weak! { fn ptsname_r(c::c_int, *mut c::c_char, c::size_t) -> c::c_int }
+
+            if let Some(libc_ptsname_r) = ptsname_r.get() {
+                libc_ptsname_r(borrowed_fd(fd), buffer.as_mut_ptr().cast(), buffer.len())
+            } else {
+                // The size declared in the `TIOCPTYGNAME` macro in
+                // sys/ttycom.h is 128.
+                let mut name: [u8; 128] = [0_u8; 128];
+                match c::ioctl(borrowed_fd(fd), c::TIOCPTYGNAME as _, &mut name) {
+                    0 => {
+                        let len = CStr::from_ptr(name.as_ptr().cast()).to_bytes().len();
+                        std::ptr::copy_nonoverlapping(name.as_ptr(), buffer.as_mut_ptr(), len + 1);
+                        0
+                    }
+                    _ => libc_errno::errno().0,
+                }
+            }
+        };
+
+        if r == 0 {
+            return Ok(unsafe { CStr::from_ptr(buffer.as_ptr().cast()).to_owned() });
+        }
+        if r != c::ERANGE {
+            return Err(io::Errno::from_raw_os_error(r));
+        }
+
+        // Use `Vec` reallocation strategy to grow capacity exponentially.
+        buffer.reserve(1);
+        buffer.resize(buffer.capacity(), 0_u8);
+    }
+}
+
+#[inline]
+pub(crate) fn unlockpt(fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe { ret(c::unlockpt(borrowed_fd(fd))) }
+}
+
+#[cfg(not(linux_kernel))]
+#[inline]
+pub(crate) fn grantpt(fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe { ret(c::grantpt(borrowed_fd(fd))) }
+}
diff --git a/vendor/rustix/src/backend/libc/rand/mod.rs b/vendor/rustix/src/backend/libc/rand/mod.rs
new file mode 100644
index 0000000..1e0181a
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/rand/mod.rs
@@ -0,0 +1,2 @@
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/libc/rand/syscalls.rs b/vendor/rustix/src/backend/libc/rand/syscalls.rs
new file mode 100644
index 0000000..3a3929e
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/rand/syscalls.rs
@@ -0,0 +1,18 @@
+//! libc syscalls supporting `rustix::rand`.
+
+#[cfg(linux_kernel)]
+use {crate::backend::c, crate::backend::conv::ret_usize, crate::io, crate::rand::GetRandomFlags};
+
+#[cfg(linux_kernel)]
+pub(crate) unsafe fn getrandom(
+    buf: *mut u8,
+    cap: usize,
+    flags: GetRandomFlags,
+) -> io::Result<usize> {
+    // `getrandom` wasn't supported in glibc until 2.25.
+    weak_or_syscall! {
+        fn getrandom(buf: *mut c::c_void, buflen: c::size_t, flags: c::c_uint) via SYS_getrandom -> c::ssize_t
+    }
+
+    ret_usize(getrandom(buf.cast(), cap, flags.bits()))
+}
diff --git a/vendor/rustix/src/backend/libc/rand/types.rs b/vendor/rustix/src/backend/libc/rand/types.rs
new file mode 100644
index 0000000..46690b5
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/rand/types.rs
@@ -0,0 +1,24 @@
+#[cfg(linux_kernel)]
+use crate::backend::c;
+#[cfg(linux_kernel)]
+use bitflags::bitflags;
+
+#[cfg(linux_kernel)]
+bitflags! {
+    /// `GRND_*` flags for use with [`getrandom`].
+    ///
+    /// [`getrandom`]: crate::rand::getrandom
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct GetRandomFlags: u32 {
+        /// `GRND_RANDOM`
+        const RANDOM = c::GRND_RANDOM;
+        /// `GRND_NONBLOCK`
+        const NONBLOCK = c::GRND_NONBLOCK;
+        /// `GRND_INSECURE`
+        const INSECURE = c::GRND_INSECURE;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/shm/mod.rs b/vendor/rustix/src/backend/libc/shm/mod.rs
new file mode 100644
index 0000000..1e0181a
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/shm/mod.rs
@@ -0,0 +1,2 @@
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/libc/shm/syscalls.rs b/vendor/rustix/src/backend/libc/shm/syscalls.rs
new file mode 100644
index 0000000..b0d907f
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/shm/syscalls.rs
@@ -0,0 +1,25 @@
+use crate::ffi::CStr;
+
+use crate::backend::c;
+use crate::backend::conv::{c_str, ret, ret_owned_fd};
+use crate::fd::OwnedFd;
+use crate::fs::Mode;
+use crate::io;
+use crate::shm::ShmOFlags;
+
+pub(crate) fn shm_open(name: &CStr, oflags: ShmOFlags, mode: Mode) -> io::Result<OwnedFd> {
+    // On this platforms, `mode_t` is `u16` and can't be passed directly to a
+    // variadic function.
+    #[cfg(apple)]
+    let mode: c::c_uint = mode.bits().into();
+
+    // Otherwise, cast to `mode_t` as that's what `open` is documented to take.
+    #[cfg(not(apple))]
+    let mode: c::mode_t = mode.bits() as _;
+
+    unsafe { ret_owned_fd(c::shm_open(c_str(name), bitflags_bits!(oflags), mode)) }
+}
+
+pub(crate) fn shm_unlink(name: &CStr) -> io::Result<()> {
+    unsafe { ret(c::shm_unlink(c_str(name))) }
+}
diff --git a/vendor/rustix/src/backend/libc/shm/types.rs b/vendor/rustix/src/backend/libc/shm/types.rs
new file mode 100644
index 0000000..6575ef5
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/shm/types.rs
@@ -0,0 +1,30 @@
+use crate::backend::c;
+use bitflags::bitflags;
+
+bitflags! {
+    /// `O_*` constants for use with [`shm_open`].
+    ///
+    /// [`shm_open`]: crate:shm::shm_open
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct ShmOFlags: u32 {
+        /// `O_CREAT`
+        #[doc(alias = "CREAT")]
+        const CREATE = bitcast!(c::O_CREAT);
+
+        /// `O_EXCL`
+        const EXCL = bitcast!(c::O_EXCL);
+
+        /// `O_RDONLY`
+        const RDONLY = bitcast!(c::O_RDONLY);
+
+        /// `O_RDWR`
+        const RDWR = bitcast!(c::O_RDWR);
+
+        /// `O_TRUNC`
+        const TRUNC = bitcast!(c::O_TRUNC);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/system/mod.rs b/vendor/rustix/src/backend/libc/system/mod.rs
new file mode 100644
index 0000000..bff7fd5
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/system/mod.rs
@@ -0,0 +1,3 @@
+#[cfg(not(windows))]
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/libc/system/syscalls.rs b/vendor/rustix/src/backend/libc/system/syscalls.rs
new file mode 100644
index 0000000..05d674b
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/system/syscalls.rs
@@ -0,0 +1,67 @@
+//! libc syscalls supporting `rustix::process`.
+
+use super::types::RawUname;
+use crate::backend::c;
+#[cfg(not(target_os = "wasi"))]
+use crate::backend::conv::ret_infallible;
+#[cfg(target_os = "linux")]
+use crate::system::RebootCommand;
+#[cfg(linux_kernel)]
+use crate::system::Sysinfo;
+use core::mem::MaybeUninit;
+#[cfg(not(any(
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+use {crate::backend::conv::ret, crate::io};
+
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub(crate) fn uname() -> RawUname {
+    let mut uname = MaybeUninit::<RawUname>::uninit();
+    unsafe {
+        let r = c::uname(uname.as_mut_ptr());
+
+        // On POSIX, `uname` is documented to return non-negative on success
+        // instead of the usual 0, though some specific systems do document
+        // that they always use zero allowing us to skip this check.
+        #[cfg(not(any(apple, freebsdlike, linux_like, target_os = "netbsd")))]
+        let r = core::cmp::min(r, 0);
+
+        ret_infallible(r);
+        uname.assume_init()
+    }
+}
+
+#[cfg(linux_kernel)]
+pub(crate) fn sysinfo() -> Sysinfo {
+    let mut info = MaybeUninit::<Sysinfo>::uninit();
+    unsafe {
+        ret_infallible(c::sysinfo(info.as_mut_ptr()));
+        info.assume_init()
+    }
+}
+
+#[cfg(not(any(
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+pub(crate) fn sethostname(name: &[u8]) -> io::Result<()> {
+    unsafe {
+        ret(c::sethostname(
+            name.as_ptr().cast(),
+            name.len().try_into().map_err(|_| io::Errno::INVAL)?,
+        ))
+    }
+}
+
+#[cfg(target_os = "linux")]
+pub(crate) fn reboot(cmd: RebootCommand) -> io::Result<()> {
+    unsafe { ret(c::reboot(cmd as i32)) }
+}
diff --git a/vendor/rustix/src/backend/libc/system/types.rs b/vendor/rustix/src/backend/libc/system/types.rs
new file mode 100644
index 0000000..731e89b
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/system/types.rs
@@ -0,0 +1,8 @@
+use crate::backend::c;
+
+/// `sysinfo`
+#[cfg(linux_kernel)]
+pub type Sysinfo = c::sysinfo;
+
+#[cfg(not(target_os = "wasi"))]
+pub(crate) type RawUname = c::utsname;
diff --git a/vendor/rustix/src/backend/libc/termios/mod.rs b/vendor/rustix/src/backend/libc/termios/mod.rs
new file mode 100644
index 0000000..ef944f0
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/termios/mod.rs
@@ -0,0 +1 @@
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/libc/termios/syscalls.rs b/vendor/rustix/src/backend/libc/termios/syscalls.rs
new file mode 100644
index 0000000..a833aea
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/termios/syscalls.rs
@@ -0,0 +1,403 @@
+//! libc syscalls supporting `rustix::termios`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend::syscalls` module documentation for details.
+
+use crate::backend::c;
+#[cfg(not(target_os = "wasi"))]
+use crate::backend::conv::ret_pid_t;
+use crate::backend::conv::{borrowed_fd, ret};
+use crate::fd::BorrowedFd;
+#[cfg(all(feature = "alloc", feature = "procfs"))]
+#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))]
+use crate::ffi::CStr;
+#[cfg(any(
+    not(target_os = "espidf"),
+    all(
+        feature = "procfs",
+        not(any(target_os = "fuchsia", target_os = "wasi"))
+    )
+))]
+use core::mem::MaybeUninit;
+#[cfg(not(target_os = "wasi"))]
+use {crate::io, crate::pid::Pid};
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+use {
+    crate::termios::{Action, OptionalActions, QueueSelector, Termios, Winsize},
+    crate::utils::as_mut_ptr,
+};
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+pub(crate) fn tcgetattr(fd: BorrowedFd<'_>) -> io::Result<Termios> {
+    // If we have `TCGETS2`, use it, so that we fill in the `c_ispeed` and
+    // `c_ospeed` fields.
+    #[cfg(linux_kernel)]
+    {
+        use crate::termios::{ControlModes, InputModes, LocalModes, OutputModes, SpecialCodes};
+        use crate::utils::default_array;
+
+        let termios2 = unsafe {
+            let mut termios2 = MaybeUninit::<c::termios2>::uninit();
+
+            // QEMU's `TCGETS2` doesn't currently set `input_speed` or
+            // `output_speed` on PowerPC, so zero out the fields ourselves.
+            #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
+            {
+                termios2.write(core::mem::zeroed());
+            }
+
+            ret(c::ioctl(
+                borrowed_fd(fd),
+                c::TCGETS2 as _,
+                termios2.as_mut_ptr(),
+            ))?;
+
+            termios2.assume_init()
+        };
+
+        // Convert from the Linux `termios2` to our `Termios`.
+        let mut result = Termios {
+            input_modes: InputModes::from_bits_retain(termios2.c_iflag),
+            output_modes: OutputModes::from_bits_retain(termios2.c_oflag),
+            control_modes: ControlModes::from_bits_retain(termios2.c_cflag),
+            local_modes: LocalModes::from_bits_retain(termios2.c_lflag),
+            line_discipline: termios2.c_line,
+            special_codes: SpecialCodes(default_array()),
+            input_speed: termios2.c_ispeed,
+            output_speed: termios2.c_ospeed,
+        };
+
+        // QEMU's `TCGETS2` doesn't currently set `input_speed` or
+        // `output_speed` on PowerPC, so set them manually if we can.
+        #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
+        {
+            use crate::termios::speed;
+
+            if result.output_speed == 0 && (termios2.c_cflag & c::CBAUD) != c::BOTHER {
+                if let Some(output_speed) = speed::decode(termios2.c_cflag & c::CBAUD) {
+                    result.output_speed = output_speed;
+                }
+            }
+            if result.input_speed == 0
+                && ((termios2.c_cflag & c::CIBAUD) >> c::IBSHIFT) != c::BOTHER
+            {
+                // For input speeds, `B0` is special-cased to mean the input
+                // speed is the same as the output speed.
+                if ((termios2.c_cflag & c::CIBAUD) >> c::IBSHIFT) == c::B0 {
+                    result.input_speed = result.output_speed;
+                } else if let Some(input_speed) =
+                    speed::decode((termios2.c_cflag & c::CIBAUD) >> c::IBSHIFT)
+                {
+                    result.input_speed = input_speed;
+                }
+            }
+        }
+
+        result.special_codes.0[..termios2.c_cc.len()].copy_from_slice(&termios2.c_cc);
+
+        Ok(result)
+    }
+
+    #[cfg(not(linux_kernel))]
+    unsafe {
+        let mut result = MaybeUninit::<Termios>::uninit();
+
+        // `result` is a `Termios` which starts with the same layout as
+        // `libc::termios`, so we can cast the pointer.
+        ret(c::tcgetattr(borrowed_fd(fd), result.as_mut_ptr().cast()))?;
+
+        Ok(result.assume_init())
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+pub(crate) fn tcgetpgrp(fd: BorrowedFd<'_>) -> io::Result<Pid> {
+    unsafe {
+        let pid = ret_pid_t(c::tcgetpgrp(borrowed_fd(fd)))?;
+
+        // This doesn't appear to be documented, but on Linux, it appears
+        // `tcsetpgrp` can succceed and set the pid to 0 if we pass it a
+        // pseudo-terminal device fd. For now, translate it into `OPNOTSUPP`.
+        #[cfg(linux_kernel)]
+        if pid == 0 {
+            return Err(io::Errno::OPNOTSUPP);
+        }
+
+        Ok(Pid::from_raw_unchecked(pid))
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+pub(crate) fn tcsetpgrp(fd: BorrowedFd<'_>, pid: Pid) -> io::Result<()> {
+    unsafe { ret(c::tcsetpgrp(borrowed_fd(fd), pid.as_raw_nonzero().get())) }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+pub(crate) fn tcsetattr(
+    fd: BorrowedFd<'_>,
+    optional_actions: OptionalActions,
+    termios: &Termios,
+) -> io::Result<()> {
+    // If we have `TCSETS2`, use it, so that we use the `c_ispeed` and
+    // `c_ospeed` fields.
+    #[cfg(linux_kernel)]
+    {
+        use crate::termios::speed;
+        use crate::utils::default_array;
+        use linux_raw_sys::general::{termios2, BOTHER, CBAUD, IBSHIFT};
+
+        #[cfg(not(any(target_arch = "sparc", target_arch = "sparc64")))]
+        use linux_raw_sys::ioctl::{TCSETS, TCSETS2};
+
+        // linux-raw-sys' ioctl-generation script for sparc isn't working yet,
+        // so as a temporary workaround, declare these manually.
+        #[cfg(any(target_arch = "sparc", target_arch = "sparc64"))]
+        const TCSETS: u32 = 0x8024_5409;
+        #[cfg(any(target_arch = "sparc", target_arch = "sparc64"))]
+        const TCSETS2: u32 = 0x802c_540d;
+
+        // Translate from `optional_actions` into an ioctl request code. On
+        // MIPS, `optional_actions` already has `TCGETS` added to it.
+        let request = TCSETS2
+            + if cfg!(any(
+                target_arch = "mips",
+                target_arch = "mips32r6",
+                target_arch = "mips64",
+                target_arch = "mips64r6"
+            )) {
+                optional_actions as u32 - TCSETS
+            } else {
+                optional_actions as u32
+            };
+
+        let input_speed = termios.input_speed();
+        let output_speed = termios.output_speed();
+        let mut termios2 = termios2 {
+            c_iflag: termios.input_modes.bits(),
+            c_oflag: termios.output_modes.bits(),
+            c_cflag: termios.control_modes.bits(),
+            c_lflag: termios.local_modes.bits(),
+            c_line: termios.line_discipline,
+            c_cc: default_array(),
+            c_ispeed: input_speed,
+            c_ospeed: output_speed,
+        };
+        // Ensure that our input and output speeds are set, as `libc`
+        // routines don't always support setting these separately.
+        termios2.c_cflag &= !CBAUD;
+        termios2.c_cflag |= speed::encode(output_speed).unwrap_or(BOTHER);
+        termios2.c_cflag &= !(CBAUD << IBSHIFT);
+        termios2.c_cflag |= speed::encode(input_speed).unwrap_or(BOTHER) << IBSHIFT;
+        let nccs = termios2.c_cc.len();
+        termios2
+            .c_cc
+            .copy_from_slice(&termios.special_codes.0[..nccs]);
+
+        unsafe { ret(c::ioctl(borrowed_fd(fd), request as _, &termios2)) }
+    }
+
+    #[cfg(not(linux_kernel))]
+    unsafe {
+        ret(c::tcsetattr(
+            borrowed_fd(fd),
+            optional_actions as _,
+            crate::utils::as_ptr(termios).cast(),
+        ))
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+pub(crate) fn tcsendbreak(fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe { ret(c::tcsendbreak(borrowed_fd(fd), 0)) }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+pub(crate) fn tcdrain(fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe { ret(c::tcdrain(borrowed_fd(fd))) }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+pub(crate) fn tcflush(fd: BorrowedFd<'_>, queue_selector: QueueSelector) -> io::Result<()> {
+    unsafe { ret(c::tcflush(borrowed_fd(fd), queue_selector as _)) }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+pub(crate) fn tcflow(fd: BorrowedFd<'_>, action: Action) -> io::Result<()> {
+    unsafe { ret(c::tcflow(borrowed_fd(fd), action as _)) }
+}
+
+#[cfg(not(target_os = "wasi"))]
+pub(crate) fn tcgetsid(fd: BorrowedFd<'_>) -> io::Result<Pid> {
+    unsafe {
+        let pid = ret_pid_t(c::tcgetsid(borrowed_fd(fd)))?;
+        Ok(Pid::from_raw_unchecked(pid))
+    }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+pub(crate) fn tcsetwinsize(fd: BorrowedFd<'_>, winsize: Winsize) -> io::Result<()> {
+    unsafe { ret(c::ioctl(borrowed_fd(fd), c::TIOCSWINSZ, &winsize)) }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+pub(crate) fn tcgetwinsize(fd: BorrowedFd<'_>) -> io::Result<Winsize> {
+    unsafe {
+        let mut buf = MaybeUninit::<Winsize>::uninit();
+        ret(c::ioctl(
+            borrowed_fd(fd),
+            c::TIOCGWINSZ.into(),
+            buf.as_mut_ptr(),
+        ))?;
+        Ok(buf.assume_init())
+    }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "nto", target_os = "wasi")))]
+#[inline]
+pub(crate) fn set_speed(termios: &mut Termios, arbitrary_speed: u32) -> io::Result<()> {
+    #[cfg(bsd)]
+    let encoded_speed = arbitrary_speed;
+
+    #[cfg(not(bsd))]
+    let encoded_speed = match crate::termios::speed::encode(arbitrary_speed) {
+        Some(encoded_speed) => encoded_speed,
+        #[cfg(linux_kernel)]
+        None => c::BOTHER,
+        #[cfg(not(linux_kernel))]
+        None => return Err(io::Errno::INVAL),
+    };
+
+    #[cfg(not(linux_kernel))]
+    unsafe {
+        ret(c::cfsetspeed(
+            as_mut_ptr(termios).cast(),
+            encoded_speed.into(),
+        ))
+    }
+
+    // Linux libc implementations don't support arbitrary speeds, so we encode
+    // the speed manually.
+    #[cfg(linux_kernel)]
+    {
+        use crate::termios::ControlModes;
+
+        debug_assert_eq!(encoded_speed & !c::CBAUD, 0);
+
+        termios.control_modes -= ControlModes::from_bits_retain(c::CBAUD | c::CIBAUD);
+        termios.control_modes |=
+            ControlModes::from_bits_retain(encoded_speed | (encoded_speed << c::IBSHIFT));
+
+        termios.input_speed = arbitrary_speed;
+        termios.output_speed = arbitrary_speed;
+
+        Ok(())
+    }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+#[inline]
+pub(crate) fn set_output_speed(termios: &mut Termios, arbitrary_speed: u32) -> io::Result<()> {
+    #[cfg(bsd)]
+    let encoded_speed = arbitrary_speed;
+
+    #[cfg(not(bsd))]
+    let encoded_speed = match crate::termios::speed::encode(arbitrary_speed) {
+        Some(encoded_speed) => encoded_speed,
+        #[cfg(linux_kernel)]
+        None => c::BOTHER,
+        #[cfg(not(linux_kernel))]
+        None => return Err(io::Errno::INVAL),
+    };
+
+    #[cfg(not(linux_kernel))]
+    unsafe {
+        ret(c::cfsetospeed(
+            as_mut_ptr(termios).cast(),
+            encoded_speed.into(),
+        ))
+    }
+
+    // Linux libc implementations don't support arbitrary speeds or setting the
+    // input and output speeds separately, so we encode the speed manually.
+    #[cfg(linux_kernel)]
+    {
+        use crate::termios::ControlModes;
+
+        debug_assert_eq!(encoded_speed & !c::CBAUD, 0);
+
+        termios.control_modes -= ControlModes::from_bits_retain(c::CBAUD);
+        termios.control_modes |= ControlModes::from_bits_retain(encoded_speed);
+
+        termios.output_speed = arbitrary_speed;
+
+        Ok(())
+    }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+#[inline]
+pub(crate) fn set_input_speed(termios: &mut Termios, arbitrary_speed: u32) -> io::Result<()> {
+    #[cfg(bsd)]
+    let encoded_speed = arbitrary_speed;
+
+    #[cfg(not(bsd))]
+    let encoded_speed = match crate::termios::speed::encode(arbitrary_speed) {
+        Some(encoded_speed) => encoded_speed,
+        #[cfg(linux_kernel)]
+        None => c::BOTHER,
+        #[cfg(not(linux_kernel))]
+        None => return Err(io::Errno::INVAL),
+    };
+
+    #[cfg(not(linux_kernel))]
+    unsafe {
+        ret(c::cfsetispeed(
+            as_mut_ptr(termios).cast(),
+            encoded_speed.into(),
+        ))
+    }
+
+    // Linux libc implementations don't support arbitrary speeds or setting the
+    // input and output speeds separately, so we encode the speed manually.
+    #[cfg(linux_kernel)]
+    {
+        use crate::termios::ControlModes;
+
+        debug_assert_eq!(encoded_speed & !c::CBAUD, 0);
+
+        termios.control_modes -= ControlModes::from_bits_retain(c::CIBAUD);
+        termios.control_modes |= ControlModes::from_bits_retain(encoded_speed << c::IBSHIFT);
+
+        termios.input_speed = arbitrary_speed;
+
+        Ok(())
+    }
+}
+
+#[cfg(not(any(target_os = "espidf", target_os = "nto", target_os = "wasi")))]
+#[inline]
+pub(crate) fn cfmakeraw(termios: &mut Termios) {
+    unsafe { c::cfmakeraw(as_mut_ptr(termios).cast()) }
+}
+
+pub(crate) fn isatty(fd: BorrowedFd<'_>) -> bool {
+    // Use the return value of `isatty` alone. We don't check `errno` because
+    // we return `bool` rather than `io::Result<bool>`, because we assume
+    // `BorrowedFd` protects us from `EBADF`, and any other reasonably
+    // anticipated `errno` value would end up interpreted as “assume it's not a
+    // terminal” anyway.
+    unsafe { c::isatty(borrowed_fd(fd)) != 0 }
+}
+
+#[cfg(all(feature = "alloc", feature = "procfs"))]
+#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))]
+pub(crate) fn ttyname(dirfd: BorrowedFd<'_>, buf: &mut [MaybeUninit<u8>]) -> io::Result<usize> {
+    unsafe {
+        // `ttyname_r` returns its error status rather than using `errno`.
+        match c::ttyname_r(borrowed_fd(dirfd), buf.as_mut_ptr().cast(), buf.len()) {
+            0 => Ok(CStr::from_ptr(buf.as_ptr().cast()).to_bytes().len()),
+            err => Err(io::Errno::from_raw_os_error(err)),
+        }
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/thread/futex.rs b/vendor/rustix/src/backend/libc/thread/futex.rs
new file mode 100644
index 0000000..44d96f0
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/thread/futex.rs
@@ -0,0 +1,43 @@
+use crate::backend::c;
+
+bitflags::bitflags! {
+    /// `FUTEX_*` flags for use with [`futex`].
+    ///
+    /// [`futex`]: crate::thread::futex
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct FutexFlags: u32 {
+        /// `FUTEX_PRIVATE_FLAG`
+        const PRIVATE = bitcast!(c::FUTEX_PRIVATE_FLAG);
+        /// `FUTEX_CLOCK_REALTIME`
+        const CLOCK_REALTIME = bitcast!(c::FUTEX_CLOCK_REALTIME);
+    }
+}
+
+/// `FUTEX_*` operations for use with [`futex`].
+///
+/// [`futex`]: crate::thread::futex
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[repr(u32)]
+pub enum FutexOperation {
+    /// `FUTEX_WAIT`
+    Wait = bitcast!(c::FUTEX_WAIT),
+    /// `FUTEX_WAKE`
+    Wake = bitcast!(c::FUTEX_WAKE),
+    /// `FUTEX_FD`
+    Fd = bitcast!(c::FUTEX_FD),
+    /// `FUTEX_REQUEUE`
+    Requeue = bitcast!(c::FUTEX_REQUEUE),
+    /// `FUTEX_CMP_REQUEUE`
+    CmpRequeue = bitcast!(c::FUTEX_CMP_REQUEUE),
+    /// `FUTEX_WAKE_OP`
+    WakeOp = bitcast!(c::FUTEX_WAKE_OP),
+    /// `FUTEX_LOCK_PI`
+    LockPi = bitcast!(c::FUTEX_LOCK_PI),
+    /// `FUTEX_UNLOCK_PI`
+    UnlockPi = bitcast!(c::FUTEX_UNLOCK_PI),
+    /// `FUTEX_TRYLOCK_PI`
+    TrylockPi = bitcast!(c::FUTEX_TRYLOCK_PI),
+    /// `FUTEX_WAIT_BITSET`
+    WaitBitset = bitcast!(c::FUTEX_WAIT_BITSET),
+}
diff --git a/vendor/rustix/src/backend/libc/thread/mod.rs b/vendor/rustix/src/backend/libc/thread/mod.rs
new file mode 100644
index 0000000..4f8c87c
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/thread/mod.rs
@@ -0,0 +1,4 @@
+#[cfg(linux_kernel)]
+pub(crate) mod futex;
+#[cfg(not(windows))]
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/libc/thread/syscalls.rs b/vendor/rustix/src/backend/libc/thread/syscalls.rs
new file mode 100644
index 0000000..33750f4
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/thread/syscalls.rs
@@ -0,0 +1,523 @@
+//! libc syscalls supporting `rustix::thread`.
+
+use crate::backend::c;
+use crate::backend::conv::ret;
+use crate::io;
+#[cfg(not(target_os = "redox"))]
+use crate::thread::{NanosleepRelativeResult, Timespec};
+#[cfg(all(target_env = "gnu", fix_y2038))]
+use crate::timespec::LibcTimespec;
+use core::mem::MaybeUninit;
+#[cfg(linux_kernel)]
+use {
+    crate::backend::conv::{borrowed_fd, ret_c_int, ret_usize},
+    crate::fd::BorrowedFd,
+    crate::pid::Pid,
+    crate::thread::{FutexFlags, FutexOperation},
+    crate::utils::as_mut_ptr,
+};
+#[cfg(not(any(
+    apple,
+    freebsdlike,
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "openbsd",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+use {crate::thread::ClockId, core::ptr::null_mut};
+
+#[cfg(all(target_env = "gnu", fix_y2038))]
+weak!(fn __clock_nanosleep_time64(c::clockid_t, c::c_int, *const LibcTimespec, *mut LibcTimespec) -> c::c_int);
+#[cfg(all(target_env = "gnu", fix_y2038))]
+weak!(fn __nanosleep64(*const LibcTimespec, *mut LibcTimespec) -> c::c_int);
+
+#[cfg(not(any(
+    apple,
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "freebsd", // FreeBSD 12 has clock_nanosleep, but libc targets FreeBSD 11.
+    target_os = "haiku",
+    target_os = "openbsd",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+#[inline]
+pub(crate) fn clock_nanosleep_relative(id: ClockId, request: &Timespec) -> NanosleepRelativeResult {
+    // Old 32-bit version: libc has `clock_nanosleep` but it is not y2038 safe
+    // by default. But there may be a `__clock_nanosleep_time64` we can use.
+    #[cfg(fix_y2038)]
+    {
+        #[cfg(target_env = "gnu")]
+        if let Some(libc_clock_nanosleep) = __clock_nanosleep_time64.get() {
+            let flags = 0;
+            let mut remain = MaybeUninit::<LibcTimespec>::uninit();
+
+            unsafe {
+                return match libc_clock_nanosleep(
+                    id as c::clockid_t,
+                    flags,
+                    &request.clone().into(),
+                    remain.as_mut_ptr(),
+                ) {
+                    0 => NanosleepRelativeResult::Ok,
+                    err if err == io::Errno::INTR.0 => {
+                        NanosleepRelativeResult::Interrupted(remain.assume_init().into())
+                    }
+                    err => NanosleepRelativeResult::Err(io::Errno(err)),
+                };
+            }
+        }
+
+        clock_nanosleep_relative_old(id, request)
+    }
+
+    // Main version: libc is y2038 safe and has `clock_nanosleep`.
+    #[cfg(not(fix_y2038))]
+    unsafe {
+        let flags = 0;
+        let mut remain = MaybeUninit::<Timespec>::uninit();
+
+        match c::clock_nanosleep(id as c::clockid_t, flags, request, remain.as_mut_ptr()) {
+            0 => NanosleepRelativeResult::Ok,
+            err if err == io::Errno::INTR.0 => {
+                NanosleepRelativeResult::Interrupted(remain.assume_init())
+            }
+            err => NanosleepRelativeResult::Err(io::Errno(err)),
+        }
+    }
+}
+
+#[cfg(all(
+    fix_y2038,
+    not(any(
+        apple,
+        target_os = "emscripten",
+        target_os = "haiku",
+        target_os = "vita"
+    ))
+))]
+fn clock_nanosleep_relative_old(id: ClockId, request: &Timespec) -> NanosleepRelativeResult {
+    let tv_sec = match request.tv_sec.try_into() {
+        Ok(tv_sec) => tv_sec,
+        Err(_) => return NanosleepRelativeResult::Err(io::Errno::OVERFLOW),
+    };
+    let tv_nsec = match request.tv_nsec.try_into() {
+        Ok(tv_nsec) => tv_nsec,
+        Err(_) => return NanosleepRelativeResult::Err(io::Errno::INVAL),
+    };
+    let old_request = c::timespec { tv_sec, tv_nsec };
+    let mut old_remain = MaybeUninit::<c::timespec>::uninit();
+    let flags = 0;
+
+    unsafe {
+        match c::clock_nanosleep(
+            id as c::clockid_t,
+            flags,
+            &old_request,
+            old_remain.as_mut_ptr(),
+        ) {
+            0 => NanosleepRelativeResult::Ok,
+            err if err == io::Errno::INTR.0 => {
+                let old_remain = old_remain.assume_init();
+                let remain = Timespec {
+                    tv_sec: old_remain.tv_sec.into(),
+                    tv_nsec: old_remain.tv_nsec.into(),
+                };
+                NanosleepRelativeResult::Interrupted(remain)
+            }
+            err => NanosleepRelativeResult::Err(io::Errno(err)),
+        }
+    }
+}
+
+#[cfg(not(any(
+    apple,
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "freebsd", // FreeBSD 12 has clock_nanosleep, but libc targets FreeBSD 11.
+    target_os = "haiku",
+    target_os = "openbsd",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+#[inline]
+pub(crate) fn clock_nanosleep_absolute(id: ClockId, request: &Timespec) -> io::Result<()> {
+    // Old 32-bit version: libc has `clock_nanosleep` but it is not y2038 safe
+    // by default. But there may be a `__clock_nanosleep_time64` we can use.
+    #[cfg(fix_y2038)]
+    {
+        #[cfg(target_env = "gnu")]
+        if let Some(libc_clock_nanosleep) = __clock_nanosleep_time64.get() {
+            let flags = c::TIMER_ABSTIME;
+            unsafe {
+                return match {
+                    libc_clock_nanosleep(
+                        id as c::clockid_t,
+                        flags,
+                        &request.clone().into(),
+                        null_mut(),
+                    )
+                } {
+                    0 => Ok(()),
+                    err => Err(io::Errno(err)),
+                };
+            }
+        }
+
+        clock_nanosleep_absolute_old(id, request)
+    }
+
+    // Main version: libc is y2038 safe and has `clock_nanosleep`.
+    #[cfg(not(fix_y2038))]
+    {
+        let flags = c::TIMER_ABSTIME;
+
+        match unsafe { c::clock_nanosleep(id as c::clockid_t, flags as _, request, null_mut()) } {
+            0 => Ok(()),
+            err => Err(io::Errno(err)),
+        }
+    }
+}
+
+#[cfg(all(
+    fix_y2038,
+    not(any(
+        apple,
+        target_os = "emscripten",
+        target_os = "haiku",
+        target_os = "vita"
+    ))
+))]
+fn clock_nanosleep_absolute_old(id: ClockId, request: &Timespec) -> io::Result<()> {
+    let flags = c::TIMER_ABSTIME;
+
+    let old_request = c::timespec {
+        tv_sec: request.tv_sec.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        tv_nsec: request.tv_nsec.try_into().map_err(|_| io::Errno::INVAL)?,
+    };
+    match unsafe { c::clock_nanosleep(id as c::clockid_t, flags, &old_request, null_mut()) } {
+        0 => Ok(()),
+        err => Err(io::Errno(err)),
+    }
+}
+
+#[cfg(not(target_os = "redox"))]
+#[inline]
+pub(crate) fn nanosleep(request: &Timespec) -> NanosleepRelativeResult {
+    // Old 32-bit version: libc has `nanosleep` but it is not y2038 safe by
+    // default. But there may be a `__nanosleep64` we can use.
+    #[cfg(fix_y2038)]
+    {
+        #[cfg(target_env = "gnu")]
+        if let Some(libc_nanosleep) = __nanosleep64.get() {
+            let mut remain = MaybeUninit::<LibcTimespec>::uninit();
+            unsafe {
+                return match ret(libc_nanosleep(&request.clone().into(), remain.as_mut_ptr())) {
+                    Ok(()) => NanosleepRelativeResult::Ok,
+                    Err(io::Errno::INTR) => {
+                        NanosleepRelativeResult::Interrupted(remain.assume_init().into())
+                    }
+                    Err(err) => NanosleepRelativeResult::Err(err),
+                };
+            }
+        }
+
+        nanosleep_old(request)
+    }
+
+    // Main version: libc is y2038 safe and has `nanosleep`.
+    #[cfg(not(fix_y2038))]
+    unsafe {
+        let mut remain = MaybeUninit::<Timespec>::uninit();
+
+        match ret(c::nanosleep(request, remain.as_mut_ptr())) {
+            Ok(()) => NanosleepRelativeResult::Ok,
+            Err(io::Errno::INTR) => NanosleepRelativeResult::Interrupted(remain.assume_init()),
+            Err(err) => NanosleepRelativeResult::Err(err),
+        }
+    }
+}
+
+#[cfg(fix_y2038)]
+fn nanosleep_old(request: &Timespec) -> NanosleepRelativeResult {
+    let tv_sec = match request.tv_sec.try_into() {
+        Ok(tv_sec) => tv_sec,
+        Err(_) => return NanosleepRelativeResult::Err(io::Errno::OVERFLOW),
+    };
+    let tv_nsec = match request.tv_nsec.try_into() {
+        Ok(tv_nsec) => tv_nsec,
+        Err(_) => return NanosleepRelativeResult::Err(io::Errno::INVAL),
+    };
+    let old_request = c::timespec { tv_sec, tv_nsec };
+    let mut old_remain = MaybeUninit::<c::timespec>::uninit();
+
+    unsafe {
+        match ret(c::nanosleep(&old_request, old_remain.as_mut_ptr())) {
+            Ok(()) => NanosleepRelativeResult::Ok,
+            Err(io::Errno::INTR) => {
+                let old_remain = old_remain.assume_init();
+                let remain = Timespec {
+                    tv_sec: old_remain.tv_sec.into(),
+                    tv_nsec: old_remain.tv_nsec.into(),
+                };
+                NanosleepRelativeResult::Interrupted(remain)
+            }
+            Err(err) => NanosleepRelativeResult::Err(err),
+        }
+    }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+#[must_use]
+pub(crate) fn gettid() -> Pid {
+    // `gettid` wasn't supported in glibc until 2.30, and musl until 1.2.2,
+    // so use `syscall`.
+    // <https://sourceware.org/bugzilla/show_bug.cgi?id=6399#c62>
+    weak_or_syscall! {
+        fn gettid() via SYS_gettid -> c::pid_t
+    }
+
+    unsafe {
+        let tid = gettid();
+        Pid::from_raw_unchecked(tid)
+    }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn setns(fd: BorrowedFd<'_>, nstype: c::c_int) -> io::Result<c::c_int> {
+    // `setns` wasn't supported in glibc until 2.14, and musl until 0.9.5,
+    // so use `syscall`.
+    weak_or_syscall! {
+        fn setns(fd: c::c_int, nstype: c::c_int) via SYS_setns -> c::c_int
+    }
+
+    unsafe { ret_c_int(setns(borrowed_fd(fd), nstype)) }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn unshare(flags: crate::thread::UnshareFlags) -> io::Result<()> {
+    unsafe { ret(c::unshare(flags.bits() as i32)) }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn capget(
+    header: &mut linux_raw_sys::general::__user_cap_header_struct,
+    data: &mut [MaybeUninit<linux_raw_sys::general::__user_cap_data_struct>],
+) -> io::Result<()> {
+    syscall! {
+        fn capget(
+            hdrp: *mut linux_raw_sys::general::__user_cap_header_struct,
+            data: *mut linux_raw_sys::general::__user_cap_data_struct
+        ) via SYS_capget -> c::c_int
+    }
+
+    unsafe {
+        ret(capget(
+            as_mut_ptr(header),
+            data.as_mut_ptr()
+                .cast::<linux_raw_sys::general::__user_cap_data_struct>(),
+        ))
+    }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn capset(
+    header: &mut linux_raw_sys::general::__user_cap_header_struct,
+    data: &[linux_raw_sys::general::__user_cap_data_struct],
+) -> io::Result<()> {
+    syscall! {
+        fn capset(
+            hdrp: *mut linux_raw_sys::general::__user_cap_header_struct,
+            data: *const linux_raw_sys::general::__user_cap_data_struct
+        ) via SYS_capset -> c::c_int
+    }
+
+    unsafe { ret(capset(as_mut_ptr(header), data.as_ptr())) }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn setuid_thread(uid: crate::ugid::Uid) -> io::Result<()> {
+    syscall! {
+        fn setuid(uid: c::uid_t) via SYS_setuid -> c::c_int
+    }
+
+    unsafe { ret(setuid(uid.as_raw())) }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn setresuid_thread(
+    ruid: crate::ugid::Uid,
+    euid: crate::ugid::Uid,
+    suid: crate::ugid::Uid,
+) -> io::Result<()> {
+    #[cfg(any(target_arch = "x86", target_arch = "arm", target_arch = "sparc"))]
+    const SYS: c::c_long = c::SYS_setresuid32 as c::c_long;
+    #[cfg(not(any(target_arch = "x86", target_arch = "arm", target_arch = "sparc")))]
+    const SYS: c::c_long = c::SYS_setresuid as c::c_long;
+
+    syscall! {
+        fn setresuid(ruid: c::uid_t, euid: c::uid_t, suid: c::uid_t) via SYS -> c::c_int
+    }
+
+    unsafe { ret(setresuid(ruid.as_raw(), euid.as_raw(), suid.as_raw())) }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn setgid_thread(gid: crate::ugid::Gid) -> io::Result<()> {
+    syscall! {
+        fn setgid(gid: c::gid_t) via SYS_setgid -> c::c_int
+    }
+
+    unsafe { ret(setgid(gid.as_raw())) }
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn setresgid_thread(
+    rgid: crate::ugid::Gid,
+    egid: crate::ugid::Gid,
+    sgid: crate::ugid::Gid,
+) -> io::Result<()> {
+    #[cfg(any(target_arch = "x86", target_arch = "arm", target_arch = "sparc"))]
+    const SYS: c::c_long = c::SYS_setresgid32 as c::c_long;
+    #[cfg(not(any(target_arch = "x86", target_arch = "arm", target_arch = "sparc")))]
+    const SYS: c::c_long = c::SYS_setresgid as c::c_long;
+
+    syscall! {
+        fn setresgid(rgid: c::gid_t, egid: c::gid_t, sgid: c::gid_t) via SYS -> c::c_int
+    }
+
+    unsafe { ret(setresgid(rgid.as_raw(), egid.as_raw(), sgid.as_raw())) }
+}
+
+// TODO: This could be de-multiplexed.
+#[cfg(linux_kernel)]
+pub(crate) unsafe fn futex(
+    uaddr: *mut u32,
+    op: FutexOperation,
+    flags: FutexFlags,
+    val: u32,
+    utime: *const Timespec,
+    uaddr2: *mut u32,
+    val3: u32,
+) -> io::Result<usize> {
+    #[cfg(all(
+        target_pointer_width = "32",
+        not(any(target_arch = "aarch64", target_arch = "x86_64"))
+    ))]
+    {
+        // TODO: Upstream this to the libc crate.
+        #[allow(non_upper_case_globals)]
+        const SYS_futex_time64: i32 = linux_raw_sys::general::__NR_futex_time64 as i32;
+
+        syscall! {
+            fn futex_time64(
+                uaddr: *mut u32,
+                futex_op: c::c_int,
+                val: u32,
+                timeout: *const Timespec,
+                uaddr2: *mut u32,
+                val3: u32
+            ) via SYS_futex_time64 -> c::ssize_t
+        }
+
+        ret_usize(futex_time64(
+            uaddr,
+            op as i32 | flags.bits() as i32,
+            val,
+            utime,
+            uaddr2,
+            val3,
+        ))
+        .or_else(|err| {
+            // See the comments in `rustix_clock_gettime_via_syscall` about
+            // emulation.
+            if err == io::Errno::NOSYS {
+                futex_old(uaddr, op, flags, val, utime, uaddr2, val3)
+            } else {
+                Err(err)
+            }
+        })
+    }
+
+    #[cfg(any(
+        target_pointer_width = "64",
+        target_arch = "aarch64",
+        target_arch = "x86_64"
+    ))]
+    {
+        syscall! {
+            fn futex(
+                uaddr: *mut u32,
+                futex_op: c::c_int,
+                val: u32,
+                timeout: *const linux_raw_sys::general::__kernel_timespec,
+                uaddr2: *mut u32,
+                val3: u32
+            ) via SYS_futex -> c::c_long
+        }
+
+        ret_usize(futex(
+            uaddr,
+            op as i32 | flags.bits() as i32,
+            val,
+            utime.cast(),
+            uaddr2,
+            val3,
+        ) as isize)
+    }
+}
+
+#[cfg(linux_kernel)]
+#[cfg(all(
+    target_pointer_width = "32",
+    not(any(target_arch = "aarch64", target_arch = "x86_64"))
+))]
+unsafe fn futex_old(
+    uaddr: *mut u32,
+    op: FutexOperation,
+    flags: FutexFlags,
+    val: u32,
+    utime: *const Timespec,
+    uaddr2: *mut u32,
+    val3: u32,
+) -> io::Result<usize> {
+    syscall! {
+        fn futex(
+            uaddr: *mut u32,
+            futex_op: c::c_int,
+            val: u32,
+            timeout: *const linux_raw_sys::general::__kernel_old_timespec,
+            uaddr2: *mut u32,
+            val3: u32
+        ) via SYS_futex -> c::c_long
+    }
+
+    let old_utime = linux_raw_sys::general::__kernel_old_timespec {
+        tv_sec: (*utime).tv_sec.try_into().map_err(|_| io::Errno::INVAL)?,
+        tv_nsec: (*utime).tv_nsec.try_into().map_err(|_| io::Errno::INVAL)?,
+    };
+    ret_usize(futex(
+        uaddr,
+        op as i32 | flags.bits() as i32,
+        val,
+        &old_utime,
+        uaddr2,
+        val3,
+    ) as isize)
+}
diff --git a/vendor/rustix/src/backend/libc/time/mod.rs b/vendor/rustix/src/backend/libc/time/mod.rs
new file mode 100644
index 0000000..bff7fd5
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/time/mod.rs
@@ -0,0 +1,3 @@
+#[cfg(not(windows))]
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/libc/time/syscalls.rs b/vendor/rustix/src/backend/libc/time/syscalls.rs
new file mode 100644
index 0000000..6b1c9fd
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/time/syscalls.rs
@@ -0,0 +1,452 @@
+//! libc syscalls supporting `rustix::time`.
+
+use crate::backend::c;
+use crate::backend::conv::ret;
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(feature = "time")]
+#[cfg(any(all(target_env = "gnu", fix_y2038), not(fix_y2038)))]
+use crate::backend::time::types::LibcItimerspec;
+#[cfg(not(target_os = "wasi"))]
+use crate::clockid::{ClockId, DynamicClockId};
+use crate::io;
+#[cfg(all(target_env = "gnu", fix_y2038))]
+use crate::timespec::LibcTimespec;
+use crate::timespec::Timespec;
+use core::mem::MaybeUninit;
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(feature = "time")]
+use {
+    crate::backend::conv::{borrowed_fd, ret_owned_fd},
+    crate::fd::{BorrowedFd, OwnedFd},
+    crate::time::{Itimerspec, TimerfdClockId, TimerfdFlags, TimerfdTimerFlags},
+};
+
+#[cfg(all(target_env = "gnu", fix_y2038))]
+weak!(fn __clock_gettime64(c::clockid_t, *mut LibcTimespec) -> c::c_int);
+#[cfg(all(target_env = "gnu", fix_y2038))]
+weak!(fn __clock_settime64(c::clockid_t, *const LibcTimespec) -> c::c_int);
+#[cfg(all(target_env = "gnu", fix_y2038))]
+weak!(fn __clock_getres64(c::clockid_t, *mut LibcTimespec) -> c::c_int);
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(all(target_env = "gnu", fix_y2038))]
+#[cfg(feature = "time")]
+weak!(fn __timerfd_gettime64(c::c_int, *mut LibcItimerspec) -> c::c_int);
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(all(target_env = "gnu", fix_y2038))]
+#[cfg(feature = "time")]
+weak!(fn __timerfd_settime64(c::c_int, c::c_int, *const LibcItimerspec, *mut LibcItimerspec) -> c::c_int);
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+#[inline]
+#[must_use]
+pub(crate) fn clock_getres(id: ClockId) -> Timespec {
+    // Old 32-bit version: libc has `clock_getres` but it is not y2038 safe by
+    // default. But there may be a `__clock_getres64` we can use.
+    #[cfg(fix_y2038)]
+    {
+        #[cfg(target_env = "gnu")]
+        if let Some(libc_clock_getres) = __clock_getres64.get() {
+            let mut timespec = MaybeUninit::<LibcTimespec>::uninit();
+            unsafe {
+                ret(libc_clock_getres(id as c::clockid_t, timespec.as_mut_ptr())).unwrap();
+                return timespec.assume_init().into();
+            }
+        }
+
+        clock_getres_old(id)
+    }
+
+    // Main version: libc is y2038 safe and has `clock_getres`.
+    #[cfg(not(fix_y2038))]
+    unsafe {
+        let mut timespec = MaybeUninit::<Timespec>::uninit();
+        let _ = c::clock_getres(id as c::clockid_t, timespec.as_mut_ptr());
+        timespec.assume_init()
+    }
+}
+
+#[cfg(fix_y2038)]
+#[must_use]
+fn clock_getres_old(id: ClockId) -> Timespec {
+    let mut old_timespec = MaybeUninit::<c::timespec>::uninit();
+
+    let old_timespec = unsafe {
+        ret(c::clock_getres(
+            id as c::clockid_t,
+            old_timespec.as_mut_ptr(),
+        ))
+        .unwrap();
+        old_timespec.assume_init()
+    };
+
+    Timespec {
+        tv_sec: old_timespec.tv_sec.into(),
+        tv_nsec: old_timespec.tv_nsec.into(),
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+#[must_use]
+pub(crate) fn clock_gettime(id: ClockId) -> Timespec {
+    // Old 32-bit version: libc has `clock_gettime` but it is not y2038 safe by
+    // default. But there may be a `__clock_gettime64` we can use.
+    #[cfg(fix_y2038)]
+    {
+        #[cfg(target_env = "gnu")]
+        if let Some(libc_clock_gettime) = __clock_gettime64.get() {
+            let mut timespec = MaybeUninit::<LibcTimespec>::uninit();
+            unsafe {
+                ret(libc_clock_gettime(
+                    id as c::clockid_t,
+                    timespec.as_mut_ptr(),
+                ))
+                .unwrap();
+                return timespec.assume_init().into();
+            }
+        }
+
+        clock_gettime_old(id)
+    }
+
+    // Use `.unwrap()` here because `clock_getres` can fail if the clock itself
+    // overflows a number of seconds, but if that happens, the monotonic clocks
+    // can't maintain their invariants, or the realtime clocks aren't properly
+    // configured.
+    #[cfg(not(fix_y2038))]
+    unsafe {
+        let mut timespec = MaybeUninit::<Timespec>::uninit();
+        ret(c::clock_gettime(id as c::clockid_t, timespec.as_mut_ptr())).unwrap();
+        timespec.assume_init()
+    }
+}
+
+#[cfg(fix_y2038)]
+#[must_use]
+fn clock_gettime_old(id: ClockId) -> Timespec {
+    let mut old_timespec = MaybeUninit::<c::timespec>::uninit();
+
+    let old_timespec = unsafe {
+        ret(c::clock_gettime(
+            id as c::clockid_t,
+            old_timespec.as_mut_ptr(),
+        ))
+        .unwrap();
+        old_timespec.assume_init()
+    };
+
+    Timespec {
+        tv_sec: old_timespec.tv_sec.into(),
+        tv_nsec: old_timespec.tv_nsec.into(),
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub(crate) fn clock_gettime_dynamic(id: DynamicClockId<'_>) -> io::Result<Timespec> {
+    let id: c::clockid_t = match id {
+        DynamicClockId::Known(id) => id as c::clockid_t,
+
+        #[cfg(linux_kernel)]
+        DynamicClockId::Dynamic(fd) => {
+            use crate::fd::AsRawFd;
+            const CLOCKFD: i32 = 3;
+            (!fd.as_raw_fd() << 3) | CLOCKFD
+        }
+
+        #[cfg(not(linux_kernel))]
+        DynamicClockId::Dynamic(_fd) => {
+            // Dynamic clocks are not supported on this platform.
+            return Err(io::Errno::INVAL);
+        }
+
+        #[cfg(linux_kernel)]
+        DynamicClockId::RealtimeAlarm => c::CLOCK_REALTIME_ALARM,
+
+        #[cfg(linux_kernel)]
+        DynamicClockId::Tai => c::CLOCK_TAI,
+
+        #[cfg(any(
+            freebsdlike,
+            linux_kernel,
+            target_os = "fuchsia",
+            target_os = "openbsd"
+        ))]
+        DynamicClockId::Boottime => c::CLOCK_BOOTTIME,
+
+        #[cfg(any(linux_kernel, target_os = "fuchsia"))]
+        DynamicClockId::BoottimeAlarm => c::CLOCK_BOOTTIME_ALARM,
+    };
+
+    // Old 32-bit version: libc has `clock_gettime` but it is not y2038
+    // safe by default. But there may be a `__clock_gettime64` we can use.
+    #[cfg(fix_y2038)]
+    {
+        #[cfg(target_env = "gnu")]
+        if let Some(libc_clock_gettime) = __clock_gettime64.get() {
+            let mut timespec = MaybeUninit::<LibcTimespec>::uninit();
+            unsafe {
+                ret(libc_clock_gettime(
+                    id as c::clockid_t,
+                    timespec.as_mut_ptr(),
+                ))?;
+
+                return Ok(timespec.assume_init().into());
+            }
+        }
+
+        clock_gettime_dynamic_old(id)
+    }
+
+    // Main version: libc is y2038 safe and has `clock_gettime`.
+    #[cfg(not(fix_y2038))]
+    unsafe {
+        let mut timespec = MaybeUninit::<Timespec>::uninit();
+
+        ret(c::clock_gettime(id as c::clockid_t, timespec.as_mut_ptr()))?;
+
+        Ok(timespec.assume_init())
+    }
+}
+
+#[cfg(fix_y2038)]
+#[inline]
+fn clock_gettime_dynamic_old(id: c::clockid_t) -> io::Result<Timespec> {
+    let mut old_timespec = MaybeUninit::<c::timespec>::uninit();
+
+    let old_timespec = unsafe {
+        ret(c::clock_gettime(
+            id as c::clockid_t,
+            old_timespec.as_mut_ptr(),
+        ))?;
+
+        old_timespec.assume_init()
+    };
+
+    Ok(Timespec {
+        tv_sec: old_timespec.tv_sec.into(),
+        tv_nsec: old_timespec.tv_nsec.into(),
+    })
+}
+
+#[cfg(not(any(
+    target_os = "redox",
+    target_os = "wasi",
+    all(apple, not(target_os = "macos"))
+)))]
+#[inline]
+pub(crate) fn clock_settime(id: ClockId, timespec: Timespec) -> io::Result<()> {
+    // Old 32-bit version: libc has `clock_gettime` but it is not y2038 safe by
+    // default. But there may be a `__clock_settime64` we can use.
+    #[cfg(fix_y2038)]
+    {
+        #[cfg(target_env = "gnu")]
+        if let Some(libc_clock_settime) = __clock_settime64.get() {
+            unsafe {
+                let mut new_timespec = core::mem::zeroed::<LibcTimespec>();
+                new_timespec.tv_sec = timespec.tv_sec;
+                new_timespec.tv_nsec = timespec.tv_nsec as _;
+                return ret(libc_clock_settime(id as c::clockid_t, &new_timespec));
+            }
+        }
+
+        clock_settime_old(id, timespec)
+    }
+
+    // Main version: libc is y2038 safe and has `clock_settime`.
+    #[cfg(not(fix_y2038))]
+    unsafe {
+        ret(c::clock_settime(id as c::clockid_t, &timespec))
+    }
+}
+
+#[cfg(not(any(
+    target_os = "redox",
+    target_os = "wasi",
+    all(apple, not(target_os = "macos"))
+)))]
+#[cfg(fix_y2038)]
+fn clock_settime_old(id: ClockId, timespec: Timespec) -> io::Result<()> {
+    let old_timespec = c::timespec {
+        tv_sec: timespec
+            .tv_sec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        tv_nsec: timespec.tv_nsec as _,
+    };
+
+    unsafe { ret(c::clock_settime(id as c::clockid_t, &old_timespec)) }
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(feature = "time")]
+pub(crate) fn timerfd_create(id: TimerfdClockId, flags: TimerfdFlags) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(c::timerfd_create(id as c::clockid_t, bitflags_bits!(flags))) }
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(feature = "time")]
+pub(crate) fn timerfd_settime(
+    fd: BorrowedFd<'_>,
+    flags: TimerfdTimerFlags,
+    new_value: &Itimerspec,
+) -> io::Result<Itimerspec> {
+    // Old 32-bit version: libc has `timerfd_settime` but it is not y2038 safe
+    // by default. But there may be a `__timerfd_settime64` we can use.
+    #[cfg(fix_y2038)]
+    {
+        #[cfg(target_env = "gnu")]
+        if let Some(libc_timerfd_settime) = __timerfd_settime64.get() {
+            let mut result = MaybeUninit::<LibcItimerspec>::uninit();
+            unsafe {
+                ret(libc_timerfd_settime(
+                    borrowed_fd(fd),
+                    bitflags_bits!(flags),
+                    &new_value.clone().into(),
+                    result.as_mut_ptr(),
+                ))?;
+                return Ok(result.assume_init().into());
+            }
+        }
+
+        timerfd_settime_old(fd, flags, new_value)
+    }
+
+    #[cfg(not(fix_y2038))]
+    unsafe {
+        let mut result = MaybeUninit::<LibcItimerspec>::uninit();
+        ret(c::timerfd_settime(
+            borrowed_fd(fd),
+            bitflags_bits!(flags),
+            new_value,
+            result.as_mut_ptr(),
+        ))?;
+        Ok(result.assume_init())
+    }
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(fix_y2038)]
+#[cfg(feature = "time")]
+fn timerfd_settime_old(
+    fd: BorrowedFd<'_>,
+    flags: TimerfdTimerFlags,
+    new_value: &Itimerspec,
+) -> io::Result<Itimerspec> {
+    let mut old_result = MaybeUninit::<c::itimerspec>::uninit();
+
+    // Convert `new_value` to the old `itimerspec` format.
+    let old_new_value = c::itimerspec {
+        it_interval: c::timespec {
+            tv_sec: new_value
+                .it_interval
+                .tv_sec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+            tv_nsec: new_value
+                .it_interval
+                .tv_nsec
+                .try_into()
+                .map_err(|_| io::Errno::INVAL)?,
+        },
+        it_value: c::timespec {
+            tv_sec: new_value
+                .it_value
+                .tv_sec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+            tv_nsec: new_value
+                .it_value
+                .tv_nsec
+                .try_into()
+                .map_err(|_| io::Errno::INVAL)?,
+        },
+    };
+
+    let old_result = unsafe {
+        ret(c::timerfd_settime(
+            borrowed_fd(fd),
+            bitflags_bits!(flags),
+            &old_new_value,
+            old_result.as_mut_ptr(),
+        ))?;
+        old_result.assume_init()
+    };
+
+    Ok(Itimerspec {
+        it_interval: Timespec {
+            tv_sec: old_result
+                .it_interval
+                .tv_sec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+            tv_nsec: old_result.it_interval.tv_nsec as _,
+        },
+        it_value: Timespec {
+            tv_sec: old_result
+                .it_interval
+                .tv_sec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+            tv_nsec: old_result.it_interval.tv_nsec as _,
+        },
+    })
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(feature = "time")]
+pub(crate) fn timerfd_gettime(fd: BorrowedFd<'_>) -> io::Result<Itimerspec> {
+    // Old 32-bit version: libc has `timerfd_gettime` but it is not y2038 safe
+    // by default. But there may be a `__timerfd_gettime64` we can use.
+    #[cfg(fix_y2038)]
+    {
+        #[cfg(target_env = "gnu")]
+        if let Some(libc_timerfd_gettime) = __timerfd_gettime64.get() {
+            let mut result = MaybeUninit::<LibcItimerspec>::uninit();
+            unsafe {
+                ret(libc_timerfd_gettime(borrowed_fd(fd), result.as_mut_ptr()))?;
+                return Ok(result.assume_init().into());
+            }
+        }
+
+        timerfd_gettime_old(fd)
+    }
+
+    #[cfg(not(fix_y2038))]
+    unsafe {
+        let mut result = MaybeUninit::<LibcItimerspec>::uninit();
+        ret(c::timerfd_gettime(borrowed_fd(fd), result.as_mut_ptr()))?;
+        Ok(result.assume_init())
+    }
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(fix_y2038)]
+#[cfg(feature = "time")]
+fn timerfd_gettime_old(fd: BorrowedFd<'_>) -> io::Result<Itimerspec> {
+    let mut old_result = MaybeUninit::<c::itimerspec>::uninit();
+
+    let old_result = unsafe {
+        ret(c::timerfd_gettime(borrowed_fd(fd), old_result.as_mut_ptr()))?;
+        old_result.assume_init()
+    };
+
+    Ok(Itimerspec {
+        it_interval: Timespec {
+            tv_sec: old_result
+                .it_interval
+                .tv_sec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+            tv_nsec: old_result.it_interval.tv_nsec as _,
+        },
+        it_value: Timespec {
+            tv_sec: old_result
+                .it_interval
+                .tv_sec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+            tv_nsec: old_result.it_interval.tv_nsec as _,
+        },
+    })
+}
diff --git a/vendor/rustix/src/backend/libc/time/types.rs b/vendor/rustix/src/backend/libc/time/types.rs
new file mode 100644
index 0000000..5254c6b
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/time/types.rs
@@ -0,0 +1,177 @@
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+use crate::backend::c;
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(fix_y2038)]
+use crate::timespec::LibcTimespec;
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(fix_y2038)]
+use crate::timespec::Timespec;
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+use bitflags::bitflags;
+
+/// `struct itimerspec` for use with [`timerfd_gettime`] and
+/// [`timerfd_settime`].
+///
+/// [`timerfd_gettime`]: crate::time::timerfd_gettime
+/// [`timerfd_settime`]: crate::time::timerfd_settime
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(not(fix_y2038))]
+pub type Itimerspec = c::itimerspec;
+
+/// `struct itimerspec` for use with [`timerfd_gettime`] and
+/// [`timerfd_settime`].
+///
+/// [`timerfd_gettime`]: crate::time::timerfd_gettime
+/// [`timerfd_settime`]: crate::time::timerfd_settime
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(fix_y2038)]
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct Itimerspec {
+    /// The interval of an interval timer.
+    pub it_interval: Timespec,
+    /// Time remaining in the current interval.
+    pub it_value: Timespec,
+}
+
+/// On most platforms, `LibcItimerspec` is just `Itimerspec`.
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(not(fix_y2038))]
+pub(crate) type LibcItimerspec = Itimerspec;
+
+/// On 32-bit glibc platforms, `LibcTimespec` differs from `Timespec`, so we
+/// define our own struct, with bidirectional `From` impls.
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(fix_y2038)]
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub(crate) struct LibcItimerspec {
+    pub it_interval: LibcTimespec,
+    pub it_value: LibcTimespec,
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(fix_y2038)]
+impl From<LibcItimerspec> for Itimerspec {
+    #[inline]
+    fn from(t: LibcItimerspec) -> Self {
+        Self {
+            it_interval: t.it_interval.into(),
+            it_value: t.it_value.into(),
+        }
+    }
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[cfg(fix_y2038)]
+impl From<Itimerspec> for LibcItimerspec {
+    #[inline]
+    fn from(t: Itimerspec) -> Self {
+        Self {
+            it_interval: t.it_interval.into(),
+            it_value: t.it_value.into(),
+        }
+    }
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+bitflags! {
+    /// `TFD_*` flags for use with [`timerfd_create`].
+    ///
+    /// [`timerfd_create`]: crate::time::timerfd_create
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct TimerfdFlags: u32 {
+        /// `TFD_NONBLOCK`
+        #[doc(alias = "TFD_NONBLOCK")]
+        const NONBLOCK = bitcast!(c::TFD_NONBLOCK);
+
+        /// `TFD_CLOEXEC`
+        #[doc(alias = "TFD_CLOEXEC")]
+        const CLOEXEC = bitcast!(c::TFD_CLOEXEC);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+bitflags! {
+    /// `TFD_TIMER_*` flags for use with [`timerfd_settime`].
+    ///
+    /// [`timerfd_settime`]: crate::time::timerfd_settime
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct TimerfdTimerFlags: u32 {
+        /// `TFD_TIMER_ABSTIME`
+        #[doc(alias = "TFD_TIMER_ABSTIME")]
+        const ABSTIME = bitcast!(c::TFD_TIMER_ABSTIME);
+
+        /// `TFD_TIMER_CANCEL_ON_SET`
+        #[cfg(linux_kernel)]
+        #[doc(alias = "TFD_TIMER_CANCEL_ON_SET")]
+        const CANCEL_ON_SET = bitcast!(c::TFD_TIMER_CANCEL_ON_SET);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `CLOCK_*` constants for use with [`timerfd_create`].
+///
+/// [`timerfd_create`]: crate::time::timerfd_create
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+#[repr(u32)]
+#[non_exhaustive]
+pub enum TimerfdClockId {
+    /// `CLOCK_REALTIME`—A clock that tells the “real” time.
+    ///
+    /// This is a clock that tells the amount of time elapsed since the Unix
+    /// epoch, 1970-01-01T00:00:00Z. The clock is externally settable, so it is
+    /// not monotonic. Successive reads may see decreasing times, so it isn't
+    /// reliable for measuring durations.
+    #[doc(alias = "CLOCK_REALTIME")]
+    Realtime = bitcast!(c::CLOCK_REALTIME),
+
+    /// `CLOCK_MONOTONIC`—A clock that tells an abstract time.
+    ///
+    /// Unlike `Realtime`, this clock is not based on a fixed known epoch, so
+    /// individual times aren't meaningful. However, since it isn't settable,
+    /// it is reliable for measuring durations.
+    ///
+    /// This clock does not advance while the system is suspended; see
+    /// `Boottime` for a clock that does.
+    #[doc(alias = "CLOCK_MONOTONIC")]
+    Monotonic = bitcast!(c::CLOCK_MONOTONIC),
+
+    /// `CLOCK_BOOTTIME`—Like `Monotonic`, but advances while suspended.
+    ///
+    /// This clock is similar to `Monotonic`, but does advance while the system
+    /// is suspended.
+    #[doc(alias = "CLOCK_BOOTTIME")]
+    Boottime = bitcast!(c::CLOCK_BOOTTIME),
+
+    /// `CLOCK_REALTIME_ALARM`—Like `Realtime`, but wakes a suspended system.
+    ///
+    /// This clock is like `Realtime`, but can wake up a suspended system.
+    ///
+    /// Use of this clock requires the `CAP_WAKE_ALARM` Linux capability.
+    #[doc(alias = "CLOCK_REALTIME_ALARM")]
+    RealtimeAlarm = bitcast!(c::CLOCK_REALTIME_ALARM),
+
+    /// `CLOCK_BOOTTIME_ALARM`—Like `Boottime`, but wakes a suspended system.
+    ///
+    /// This clock is like `Boottime`, but can wake up a suspended system.
+    ///
+    /// Use of this clock requires the `CAP_WAKE_ALARM` Linux capability.
+    #[doc(alias = "CLOCK_BOOTTIME_ALARM")]
+    BoottimeAlarm = bitcast!(c::CLOCK_BOOTTIME_ALARM),
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[test]
+fn test_types() {
+    assert_eq_size!(TimerfdFlags, c::c_int);
+    assert_eq_size!(TimerfdTimerFlags, c::c_int);
+}
diff --git a/vendor/rustix/src/backend/libc/ugid/mod.rs b/vendor/rustix/src/backend/libc/ugid/mod.rs
new file mode 100644
index 0000000..ef944f0
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/ugid/mod.rs
@@ -0,0 +1 @@
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/libc/ugid/syscalls.rs b/vendor/rustix/src/backend/libc/ugid/syscalls.rs
new file mode 100644
index 0000000..0d3f622
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/ugid/syscalls.rs
@@ -0,0 +1,42 @@
+use crate::backend::c;
+use crate::ugid::{Gid, Uid};
+
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+#[must_use]
+pub(crate) fn getuid() -> Uid {
+    unsafe {
+        let uid = c::getuid();
+        Uid::from_raw(uid)
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+#[must_use]
+pub(crate) fn geteuid() -> Uid {
+    unsafe {
+        let uid = c::geteuid();
+        Uid::from_raw(uid)
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+#[must_use]
+pub(crate) fn getgid() -> Gid {
+    unsafe {
+        let gid = c::getgid();
+        Gid::from_raw(gid)
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+#[must_use]
+pub(crate) fn getegid() -> Gid {
+    unsafe {
+        let gid = c::getegid();
+        Gid::from_raw(gid)
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/winsock_c.rs b/vendor/rustix/src/backend/libc/winsock_c.rs
new file mode 100644
index 0000000..ee2704a
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/winsock_c.rs
@@ -0,0 +1,59 @@
+//! Adapt the Winsock API to resemble a POSIX-style libc API.
+
+#![allow(unused_imports)]
+#![allow(non_camel_case_types)]
+#![allow(dead_code)]
+
+use windows_sys::Win32::Networking::WinSock;
+
+// Define the basic C types. With Rust 1.64, we can use these from `core::ffi`.
+pub(crate) type c_schar = i8;
+pub(crate) type c_uchar = u8;
+pub(crate) type c_short = i16;
+pub(crate) type c_ushort = u16;
+pub(crate) type c_int = i32;
+pub(crate) type c_uint = u32;
+pub(crate) type c_longlong = i64;
+pub(crate) type c_ulonglong = u64;
+pub(crate) type ssize_t = isize;
+pub(crate) type c_char = i8;
+pub(crate) type c_long = i32;
+pub(crate) type c_ulong = u32;
+pub(crate) use core::ffi::c_void;
+
+// windows-sys declares these constants as u16. For better compatibility
+// with Unix-family APIs, redeclare them as u32.
+pub(crate) const AF_INET: i32 = WinSock::AF_INET as _;
+pub(crate) const AF_INET6: i32 = WinSock::AF_INET6 as _;
+pub(crate) const AF_UNSPEC: i32 = WinSock::AF_UNSPEC as _;
+
+// Include the contents of `WinSock`, renaming as needed to match POSIX.
+//
+// Use `WSA_E_CANCELLED` for `ECANCELED` instead of `WSAECANCELLED`, because
+// `WSAECANCELLED` will be removed in the future.
+// <https://docs.microsoft.com/en-us/windows/win32/api/ws2spi/nc-ws2spi-lpnsplookupserviceend#remarks>
+pub(crate) use WinSock::{
+    closesocket as close, ioctlsocket as ioctl, WSAPoll as poll, ADDRESS_FAMILY as sa_family_t,
+    ADDRINFOA as addrinfo, IN6_ADDR as in6_addr, IN_ADDR as in_addr, IPV6_MREQ as ipv6_mreq,
+    IP_MREQ as ip_mreq, LINGER as linger, SD_BOTH as SHUT_RDWR, SD_RECEIVE as SHUT_RD,
+    SD_SEND as SHUT_WR, SOCKADDR as sockaddr, SOCKADDR_IN as sockaddr_in,
+    SOCKADDR_IN6 as sockaddr_in6, SOCKADDR_STORAGE as sockaddr_storage, WSAEACCES as EACCES,
+    WSAEADDRINUSE as EADDRINUSE, WSAEADDRNOTAVAIL as EADDRNOTAVAIL,
+    WSAEAFNOSUPPORT as EAFNOSUPPORT, WSAEALREADY as EALREADY, WSAEBADF as EBADF,
+    WSAECONNABORTED as ECONNABORTED, WSAECONNREFUSED as ECONNREFUSED, WSAECONNRESET as ECONNRESET,
+    WSAEDESTADDRREQ as EDESTADDRREQ, WSAEDISCON as EDISCON, WSAEDQUOT as EDQUOT,
+    WSAEFAULT as EFAULT, WSAEHOSTDOWN as EHOSTDOWN, WSAEHOSTUNREACH as EHOSTUNREACH,
+    WSAEINPROGRESS as EINPROGRESS, WSAEINTR as EINTR, WSAEINVAL as EINVAL,
+    WSAEINVALIDPROCTABLE as EINVALIDPROCTABLE, WSAEINVALIDPROVIDER as EINVALIDPROVIDER,
+    WSAEISCONN as EISCONN, WSAELOOP as ELOOP, WSAEMFILE as EMFILE, WSAEMSGSIZE as EMSGSIZE,
+    WSAENAMETOOLONG as ENAMETOOLONG, WSAENETDOWN as ENETDOWN, WSAENETRESET as ENETRESET,
+    WSAENETUNREACH as ENETUNREACH, WSAENOBUFS as ENOBUFS, WSAENOMORE as ENOMORE,
+    WSAENOPROTOOPT as ENOPROTOOPT, WSAENOTCONN as ENOTCONN, WSAENOTEMPTY as ENOTEMPTY,
+    WSAENOTSOCK as ENOTSOCK, WSAEOPNOTSUPP as EOPNOTSUPP, WSAEPFNOSUPPORT as EPFNOSUPPORT,
+    WSAEPROCLIM as EPROCLIM, WSAEPROTONOSUPPORT as EPROTONOSUPPORT, WSAEPROTOTYPE as EPROTOTYPE,
+    WSAEPROVIDERFAILEDINIT as EPROVIDERFAILEDINIT, WSAEREFUSED as EREFUSED, WSAEREMOTE as EREMOTE,
+    WSAESHUTDOWN as ESHUTDOWN, WSAESOCKTNOSUPPORT as ESOCKTNOSUPPORT, WSAESTALE as ESTALE,
+    WSAETIMEDOUT as ETIMEDOUT, WSAETOOMANYREFS as ETOOMANYREFS, WSAEUSERS as EUSERS,
+    WSAEWOULDBLOCK as EWOULDBLOCK, WSAEWOULDBLOCK as EAGAIN, WSAPOLLFD as pollfd,
+    WSA_E_CANCELLED as ECANCELED, *,
+};
diff --git a/vendor/rustix/src/backend/linux_raw/arch/aarch64.rs b/vendor/rustix/src/backend/linux_raw/arch/aarch64.rs
new file mode 100644
index 0000000..d4cf247
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/arch/aarch64.rs
@@ -0,0 +1,268 @@
+//! aarch64 Linux system calls.
+
+use crate::backend::reg::{
+    ArgReg, FromAsm, RetReg, SyscallNumber, ToAsm, A0, A1, A2, A3, A4, A5, R0,
+};
+use core::arch::asm;
+
+#[cfg(target_pointer_width = "32")]
+compile_error!("arm64-ilp32 is not supported yet");
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall0_readonly(nr: SyscallNumber<'_>) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("x8") nr.to_asm(),
+        lateout("x0") r0,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("x8") nr.to_asm(),
+        inlateout("x0") a0.to_asm() => r0,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("x8") nr.to_asm(),
+        inlateout("x0") a0.to_asm() => r0,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_noreturn(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> ! {
+    asm!(
+        "svc 0",
+        in("x8") nr.to_asm(),
+        in("x0") a0.to_asm(),
+        options(nostack, noreturn)
+    )
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("x8") nr.to_asm(),
+        inlateout("x0") a0.to_asm() => r0,
+        in("x1") a1.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("x8") nr.to_asm(),
+        inlateout("x0") a0.to_asm() => r0,
+        in("x1") a1.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("x8") nr.to_asm(),
+        inlateout("x0") a0.to_asm() => r0,
+        in("x1") a1.to_asm(),
+        in("x2") a2.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("x8") nr.to_asm(),
+        inlateout("x0") a0.to_asm() => r0,
+        in("x1") a1.to_asm(),
+        in("x2") a2.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("x8") nr.to_asm(),
+        inlateout("x0") a0.to_asm() => r0,
+        in("x1") a1.to_asm(),
+        in("x2") a2.to_asm(),
+        in("x3") a3.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("x8") nr.to_asm(),
+        inlateout("x0") a0.to_asm() => r0,
+        in("x1") a1.to_asm(),
+        in("x2") a2.to_asm(),
+        in("x3") a3.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("x8") nr.to_asm(),
+        inlateout("x0") a0.to_asm() => r0,
+        in("x1") a1.to_asm(),
+        in("x2") a2.to_asm(),
+        in("x3") a3.to_asm(),
+        in("x4") a4.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("x8") nr.to_asm(),
+        inlateout("x0") a0.to_asm() => r0,
+        in("x1") a1.to_asm(),
+        in("x2") a2.to_asm(),
+        in("x3") a3.to_asm(),
+        in("x4") a4.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("x8") nr.to_asm(),
+        inlateout("x0") a0.to_asm() => r0,
+        in("x1") a1.to_asm(),
+        in("x2") a2.to_asm(),
+        in("x3") a3.to_asm(),
+        in("x4") a4.to_asm(),
+        in("x5") a5.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("x8") nr.to_asm(),
+        inlateout("x0") a0.to_asm() => r0,
+        in("x1") a1.to_asm(),
+        in("x2") a2.to_asm(),
+        in("x3") a3.to_asm(),
+        in("x4") a4.to_asm(),
+        in("x5") a5.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
diff --git a/vendor/rustix/src/backend/linux_raw/arch/arm.rs b/vendor/rustix/src/backend/linux_raw/arch/arm.rs
new file mode 100644
index 0000000..77c1f82
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/arch/arm.rs
@@ -0,0 +1,265 @@
+//! arm Linux system calls.
+
+use crate::backend::reg::{
+    ArgReg, FromAsm, RetReg, SyscallNumber, ToAsm, A0, A1, A2, A3, A4, A5, R0,
+};
+use core::arch::asm;
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall0_readonly(nr: SyscallNumber<'_>) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("r7") nr.to_asm(),
+        lateout("r0") r0,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("r7") nr.to_asm(),
+        inlateout("r0") a0.to_asm() => r0,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("r7") nr.to_asm(),
+        inlateout("r0") a0.to_asm() => r0,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_noreturn(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> ! {
+    asm!(
+        "svc 0",
+        in("r7") nr.to_asm(),
+        in("r0") a0.to_asm(),
+        options(nostack, noreturn)
+    )
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("r7") nr.to_asm(),
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("r7") nr.to_asm(),
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("r7") nr.to_asm(),
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("r7") nr.to_asm(),
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("r7") nr.to_asm(),
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        in("r3") a3.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("r7") nr.to_asm(),
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        in("r3") a3.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("r7") nr.to_asm(),
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        in("r3") a3.to_asm(),
+        in("r4") a4.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("r7") nr.to_asm(),
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        in("r3") a3.to_asm(),
+        in("r4") a4.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("r7") nr.to_asm(),
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        in("r3") a3.to_asm(),
+        in("r4") a4.to_asm(),
+        in("r5") a5.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "svc 0",
+        in("r7") nr.to_asm(),
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        in("r3") a3.to_asm(),
+        in("r4") a4.to_asm(),
+        in("r5") a5.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
diff --git a/vendor/rustix/src/backend/linux_raw/arch/mips.rs b/vendor/rustix/src/backend/linux_raw/arch/mips.rs
new file mode 100644
index 0000000..37932e0
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/arch/mips.rs
@@ -0,0 +1,543 @@
+//! mipsel Linux system calls.
+//!
+//! On mipsel, Linux indicates success or failure using `$a3` rather
+//! than by returning a negative error code as most other architectures do.
+//!
+//! Mips-family platforms have a special calling convention for `__NR_pipe`,
+//! however we use `__NR_pipe2` instead to avoid having to implement it.
+
+use crate::backend::reg::{
+    ArgReg, FromAsm, RetReg, SyscallNumber, ToAsm, A0, A1, A2, A3, A4, A5, A6, R0,
+};
+use core::arch::asm;
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall0_readonly(nr: SyscallNumber) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_noreturn(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> ! {
+    asm!(
+        "syscall",
+        in("$2" /*$v0*/) nr.to_asm(),
+        in("$4" /*$a0*/) a0.to_asm(),
+        options(nostack, noreturn)
+    )
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        ".set noat",
+        "subu $sp, 32",
+        "sw {}, 16($sp)",
+        "syscall",
+        "addu $sp, 32",
+        ".set at",
+        in(reg) a4.to_asm(),
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        ".set noat",
+        "subu $sp, 32",
+        "sw {}, 16($sp)",
+        "syscall",
+        "addu $sp, 32",
+        ".set at",
+        in(reg) a4.to_asm(),
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        ".set noat",
+        "subu $sp, 32",
+        "sw {}, 16($sp)",
+        "sw {}, 20($sp)",
+        "syscall",
+        "addu $sp, 32",
+        ".set at",
+        in(reg) a4.to_asm(),
+        in(reg) a5.to_asm(),
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        ".set noat",
+        "subu $sp, 32",
+        "sw {}, 16($sp)",
+        "sw {}, 20($sp)",
+        "syscall",
+        "addu $sp, 32",
+        ".set at",
+        in(reg) a4.to_asm(),
+        in(reg) a5.to_asm(),
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall7_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+    a6: ArgReg<'_, A6>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        ".set noat",
+        "subu $sp, 32",
+        "sw {}, 16($sp)",
+        "sw {}, 20($sp)",
+        "sw {}, 24($sp)",
+        "syscall",
+        "addu $sp, 32",
+        ".set at",
+        in(reg) a4.to_asm(),
+        in(reg) a5.to_asm(),
+        in(reg) a6.to_asm(),
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
diff --git a/vendor/rustix/src/backend/linux_raw/arch/mips32r6.rs b/vendor/rustix/src/backend/linux_raw/arch/mips32r6.rs
new file mode 100644
index 0000000..c2d9244
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/arch/mips32r6.rs
@@ -0,0 +1,543 @@
+//! mipsisa32r6el Linux system calls.
+//!
+//! On mipsisa32r6el, Linux indicates success or failure using `$a3` rather
+//! than by returning a negative error code as most other architectures do.
+//!
+//! Mips-family platforms have a special calling convention for `__NR_pipe`,
+//! however we use `__NR_pipe2` instead to avoid having to implement it.
+
+use crate::backend::reg::{
+    ArgReg, FromAsm, RetReg, SyscallNumber, ToAsm, A0, A1, A2, A3, A4, A5, A6, R0,
+};
+use core::arch::asm;
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall0_readonly(nr: SyscallNumber) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_noreturn(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> ! {
+    asm!(
+        "syscall",
+        in("$2" /*$v0*/) nr.to_asm(),
+        in("$4" /*$a0*/) a0.to_asm(),
+        options(nostack, noreturn)
+    )
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        ".set noat",
+        "subu $sp, 32",
+        "sw {}, 16($sp)",
+        "syscall",
+        "addu $sp, 32",
+        ".set at",
+        in(reg) a4.to_asm(),
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        ".set noat",
+        "subu $sp, 32",
+        "sw {}, 16($sp)",
+        "syscall",
+        "addu $sp, 32",
+        ".set at",
+        in(reg) a4.to_asm(),
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        ".set noat",
+        "subu $sp, 32",
+        "sw {}, 16($sp)",
+        "sw {}, 20($sp)",
+        "syscall",
+        "addu $sp, 32",
+        ".set at",
+        in(reg) a4.to_asm(),
+        in(reg) a5.to_asm(),
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        ".set noat",
+        "subu $sp, 32",
+        "sw {}, 16($sp)",
+        "sw {}, 20($sp)",
+        "syscall",
+        "addu $sp, 32",
+        ".set at",
+        in(reg) a4.to_asm(),
+        in(reg) a5.to_asm(),
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall7_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+    a6: ArgReg<'_, A6>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        ".set noat",
+        "subu $sp, 32",
+        "sw {}, 16($sp)",
+        "sw {}, 20($sp)",
+        "sw {}, 24($sp)",
+        "syscall",
+        "addu $sp, 32",
+        ".set at",
+        in(reg) a4.to_asm(),
+        in(reg) a5.to_asm(),
+        in(reg) a6.to_asm(),
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$t0*/) _,
+        lateout("$9" /*$t1*/) _,
+        lateout("$10" /*$t2*/) _,
+        lateout("$11" /*$t3*/) _,
+        lateout("$12" /*$t4*/) _,
+        lateout("$13" /*$t5*/) _,
+        lateout("$14" /*$t6*/) _,
+        lateout("$15" /*$t7*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
diff --git a/vendor/rustix/src/backend/linux_raw/arch/mips64.rs b/vendor/rustix/src/backend/linux_raw/arch/mips64.rs
new file mode 100644
index 0000000..244daf3
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/arch/mips64.rs
@@ -0,0 +1,466 @@
+//! mips64el Linux system calls.
+//!
+//! On mips64el, Linux indicates success or failure using `$a3` (`$7`) rather
+//! than by returning a negative error code as most other architectures do.
+//!
+//! Mips-family platforms have a special calling convention for `__NR_pipe`,
+//! however we use `__NR_pipe2` instead to avoid having to implement it.
+
+use crate::backend::reg::{
+    ArgReg, FromAsm, RetReg, SyscallNumber, ToAsm, A0, A1, A2, A3, A4, A5, R0,
+};
+use core::arch::asm;
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall0_readonly(nr: SyscallNumber) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_noreturn(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> ! {
+    asm!(
+        "syscall",
+        in("$2" /*$v0*/) nr.to_asm(),
+        in("$4" /*$a0*/) a0.to_asm(),
+        options(nostack, noreturn)
+    )
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        inlateout("$8" /*$a4*/) a4.to_asm() => _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        inlateout("$8" /*$a4*/) a4.to_asm() => _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        inlateout("$8" /*$a4*/) a4.to_asm() => _,
+        inlateout("$9" /*$a5*/) a5.to_asm() => _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        inlateout("$8" /*$a4*/) a4.to_asm() => _,
+        inlateout("$9" /*$a5*/) a5.to_asm() => _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
diff --git a/vendor/rustix/src/backend/linux_raw/arch/mips64r6.rs b/vendor/rustix/src/backend/linux_raw/arch/mips64r6.rs
new file mode 100644
index 0000000..8c06d9e
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/arch/mips64r6.rs
@@ -0,0 +1,470 @@
+//! mipsisa64r6el Linux system calls.
+//!
+//! On mipsisa64r6el, Linux indicates success or failure using `$a3` (`$7`)
+//! rather than by returning a negative error code as most other architectures
+//! do.
+//!
+//! Mips-family platforms have a special calling convention for `__NR_pipe`,
+//! however we use `__NR_pipe2` instead to avoid having to implement it.
+//!
+//! Note that MIPS R6 inline assembly currently doesn't differ from MIPS,
+//! because no explicit call of R6-only or R2-only instructions exist here.
+
+use crate::backend::reg::{
+    ArgReg, FromAsm, RetReg, SyscallNumber, ToAsm, A0, A1, A2, A3, A4, A5, R0,
+};
+use core::arch::asm;
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall0_readonly(nr: SyscallNumber) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_noreturn(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> ! {
+    asm!(
+        "syscall",
+        in("$2" /*$v0*/) nr.to_asm(),
+        in("$4" /*$a0*/) a0.to_asm(),
+        options(nostack, noreturn)
+    )
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        lateout("$7" /*$a3*/) err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        lateout("$8" /*$a4*/) _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        inlateout("$8" /*$a4*/) a4.to_asm() => _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        inlateout("$8" /*$a4*/) a4.to_asm() => _,
+        lateout("$9" /*$a5*/) _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        inlateout("$8" /*$a4*/) a4.to_asm() => _,
+        inlateout("$9" /*$a5*/) a5.to_asm() => _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let x0;
+    let err: usize;
+    asm!(
+        "syscall",
+        inlateout("$2" /*$v0*/) nr.to_asm() => x0,
+        in("$4" /*$a0*/) a0.to_asm(),
+        in("$5" /*$a1*/) a1.to_asm(),
+        in("$6" /*$a2*/) a2.to_asm(),
+        inlateout("$7" /*$a3*/) a3.to_asm() => err,
+        inlateout("$8" /*$a4*/) a4.to_asm() => _,
+        inlateout("$9" /*$a5*/) a5.to_asm() => _,
+        lateout("$10" /*$a6*/) _,
+        lateout("$11" /*$a7*/) _,
+        lateout("$12" /*$t0*/) _,
+        lateout("$13" /*$t1*/) _,
+        lateout("$14" /*$t2*/) _,
+        lateout("$15" /*$t3*/) _,
+        lateout("$24" /*$t8*/) _,
+        lateout("$25" /*$t9*/) _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(if err != 0 {
+        (x0 as usize).wrapping_neg() as *mut _
+    } else {
+        x0
+    })
+}
diff --git a/vendor/rustix/src/backend/linux_raw/arch/mod.rs b/vendor/rustix/src/backend/linux_raw/arch/mod.rs
new file mode 100644
index 0000000..ac9e25f
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/arch/mod.rs
@@ -0,0 +1,317 @@
+//! Architecture-specific syscall code.
+//!
+//! This module also has a `choose` submodule which chooses a scheme and is
+//! what most of the `rustix` syscalls use.
+//!
+//! Compilers should really have intrinsics for making system calls. They're
+//! much like regular calls, with custom calling conventions, and calling
+//! conventions are otherwise the compiler's job. But for now, use inline asm.
+//!
+//! The calling conventions for Linux syscalls are [documented here].
+//!
+//! [documented here]: https://man7.org/linux/man-pages/man2/syscall.2.html
+//!
+//! # Safety
+//!
+//! This contains the inline `asm` statements performing the syscall
+//! instructions.
+
+#![allow(unsafe_code)]
+#![cfg_attr(not(feature = "all-apis"), allow(unused_imports))]
+// We'll use as many arguments as syscalls need.
+#![allow(clippy::too_many_arguments)]
+
+// These functions always use the machine's syscall instruction, even when it
+// isn't the fastest option available.
+#[cfg_attr(target_arch = "aarch64", path = "aarch64.rs")]
+#[cfg_attr(all(target_arch = "arm", not(thumb_mode)), path = "arm.rs")]
+#[cfg_attr(all(target_arch = "arm", thumb_mode), path = "thumb.rs")]
+#[cfg_attr(target_arch = "mips", path = "mips.rs")]
+#[cfg_attr(target_arch = "mips32r6", path = "mips32r6.rs")]
+#[cfg_attr(target_arch = "mips64", path = "mips64.rs")]
+#[cfg_attr(target_arch = "mips64r6", path = "mips64r6.rs")]
+#[cfg_attr(target_arch = "powerpc64", path = "powerpc64.rs")]
+#[cfg_attr(target_arch = "riscv64", path = "riscv64.rs")]
+#[cfg_attr(target_arch = "x86", path = "x86.rs")]
+#[cfg_attr(target_arch = "x86_64", path = "x86_64.rs")]
+pub(in crate::backend) mod asm;
+
+// On most architectures, the architecture syscall instruction is fast, so use
+// it directly.
+#[cfg(any(
+    target_arch = "arm",
+    target_arch = "aarch64",
+    target_arch = "mips",
+    target_arch = "mips32r6",
+    target_arch = "mips64",
+    target_arch = "mips64r6",
+    target_arch = "powerpc64",
+    target_arch = "riscv64",
+    target_arch = "x86_64",
+))]
+pub(in crate::backend) use self::asm as choose;
+
+// On 32-bit x86, use vDSO wrappers for all syscalls. We could use the
+// architecture syscall instruction (`int 0x80`), but the vDSO kernel_vsyscall
+// mechanism is much faster.
+#[cfg(target_arch = "x86")]
+pub(in crate::backend) use super::vdso_wrappers::x86_via_vdso as choose;
+
+// This would be the code for always using `int 0x80` on 32-bit x86.
+//#[cfg(target_arch = "x86")]
+//pub(in crate::backend) use self::asm as choose;
+
+// Macros for invoking system calls.
+//
+// These factor out:
+//  - Calling `nr` on the syscall number to convert it into `SyscallNumber`.
+//  - Calling `.into()` on each of the arguments to convert them into `ArgReg`.
+//  - Qualifying the `syscall*` and `__NR_*` identifiers.
+//  - Counting the number of arguments.
+macro_rules! syscall {
+    ($nr:ident) => {
+        $crate::backend::arch::choose::syscall0($crate::backend::reg::nr(
+            linux_raw_sys::general::$nr,
+        ))
+    };
+
+    ($nr:ident, $a0:expr) => {
+        $crate::backend::arch::choose::syscall1(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr) => {
+        $crate::backend::arch::choose::syscall2(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr, $a2:expr) => {
+        $crate::backend::arch::choose::syscall3(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+            $a2.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr) => {
+        $crate::backend::arch::choose::syscall4(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+            $a2.into(),
+            $a3.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr) => {
+        $crate::backend::arch::choose::syscall5(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+            $a2.into(),
+            $a3.into(),
+            $a4.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr) => {
+        $crate::backend::arch::choose::syscall6(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+            $a2.into(),
+            $a3.into(),
+            $a4.into(),
+            $a5.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr, $a6:expr) => {
+        $crate::backend::arch::choose::syscall7(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+            $a2.into(),
+            $a3.into(),
+            $a4.into(),
+            $a5.into(),
+            $a6.into(),
+        )
+    };
+}
+
+// Macro to invoke a syscall that always uses direct assembly, rather than the
+// vDSO. Useful when still finding the vDSO.
+#[allow(unused_macros)]
+macro_rules! syscall_always_asm {
+    ($nr:ident) => {
+        $crate::backend::arch::asm::syscall0($crate::backend::reg::nr(linux_raw_sys::general::$nr))
+    };
+
+    ($nr:ident, $a0:expr) => {
+        $crate::backend::arch::asm::syscall1(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr) => {
+        $crate::backend::arch::asm::syscall2(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr, $a2:expr) => {
+        $crate::backend::arch::asm::syscall3(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+            $a2.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr) => {
+        $crate::backend::arch::asm::syscall4(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+            $a2.into(),
+            $a3.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr) => {
+        $crate::backend::arch::asm::syscall5(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+            $a2.into(),
+            $a3.into(),
+            $a4.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr) => {
+        $crate::backend::arch::asm::syscall6(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+            $a2.into(),
+            $a3.into(),
+            $a4.into(),
+            $a5.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr, $a6:expr) => {
+        $crate::backend::arch::asm::syscall7(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+            $a2.into(),
+            $a3.into(),
+            $a4.into(),
+            $a5.into(),
+            $a6.into(),
+        )
+    };
+}
+
+/// Like `syscall`, but adds the `readonly` attribute to the inline asm, which
+/// indicates that the syscall does not mutate any memory.
+macro_rules! syscall_readonly {
+    ($nr:ident) => {
+        $crate::backend::arch::choose::syscall0_readonly($crate::backend::reg::nr(
+            linux_raw_sys::general::$nr,
+        ))
+    };
+
+    ($nr:ident, $a0:expr) => {
+        $crate::backend::arch::choose::syscall1_readonly(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr) => {
+        $crate::backend::arch::choose::syscall2_readonly(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr, $a2:expr) => {
+        $crate::backend::arch::choose::syscall3_readonly(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+            $a2.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr) => {
+        $crate::backend::arch::choose::syscall4_readonly(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+            $a2.into(),
+            $a3.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr) => {
+        $crate::backend::arch::choose::syscall5_readonly(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+            $a2.into(),
+            $a3.into(),
+            $a4.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr) => {
+        $crate::backend::arch::choose::syscall6_readonly(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+            $a2.into(),
+            $a3.into(),
+            $a4.into(),
+            $a5.into(),
+        )
+    };
+
+    ($nr:ident, $a0:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr, $a6:expr) => {
+        $crate::backend::arch::choose::syscall7_readonly(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+            $a1.into(),
+            $a2.into(),
+            $a3.into(),
+            $a4.into(),
+            $a5.into(),
+            $a6.into(),
+        )
+    };
+}
+
+/// Like `syscall`, but indicates that the syscall does not return.
+#[cfg(feature = "runtime")]
+macro_rules! syscall_noreturn {
+    ($nr:ident, $a0:expr) => {
+        $crate::backend::arch::choose::syscall1_noreturn(
+            $crate::backend::reg::nr(linux_raw_sys::general::$nr),
+            $a0.into(),
+        )
+    };
+}
diff --git a/vendor/rustix/src/backend/linux_raw/arch/powerpc64.rs b/vendor/rustix/src/backend/linux_raw/arch/powerpc64.rs
new file mode 100644
index 0000000..14866c2
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/arch/powerpc64.rs
@@ -0,0 +1,413 @@
+//! powerpc64le Linux system calls.
+//!
+//! On powerpc64le, Linux indicates success or failure using `cr0.SO` rather
+//! than by returning a negative error code as most other architectures do. In
+//! theory we could immediately translate this into a `Result`, and it'd save a
+//! few branches. And in theory we could have specialized sequences for use
+//! with syscalls that are known to never fail. However, those would require
+//! more extensive changes in rustix's platform-independent code. For now, we
+//! check the flag and negate the error value to make PowerPC64 look like other
+//! architectures.
+
+use crate::backend::reg::{
+    ArgReg, FromAsm, RetReg, SyscallNumber, ToAsm, A0, A1, A2, A3, A4, A5, R0,
+};
+use core::arch::asm;
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall0_readonly(nr: SyscallNumber<'_>) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "sc",
+        "bns 0f",
+        "neg 3, 3",
+        "0:",
+        inlateout("r0") nr.to_asm() => _,
+        lateout("r3") r0,
+        lateout("r4") _,
+        lateout("r5") _,
+        lateout("r6") _,
+        lateout("r7") _,
+        lateout("r8") _,
+        lateout("r9") _,
+        lateout("r10") _,
+        lateout("r11") _,
+        lateout("r12") _,
+        lateout("cr0") _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "sc",
+        "bns 0f",
+        "neg 3, 3",
+        "0:",
+        inlateout("r0") nr.to_asm() => _,
+        inlateout("r3") a0.to_asm() => r0,
+        lateout("r4") _,
+        lateout("r5") _,
+        lateout("r6") _,
+        lateout("r7") _,
+        lateout("r8") _,
+        lateout("r9") _,
+        lateout("r10") _,
+        lateout("r11") _,
+        lateout("r12") _,
+        lateout("cr0") _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "sc",
+        "bns 0f",
+        "neg 3, 3",
+        "0:",
+        inlateout("r0") nr.to_asm() => _,
+        inlateout("r3") a0.to_asm() => r0,
+        lateout("r4") _,
+        lateout("r5") _,
+        lateout("r6") _,
+        lateout("r7") _,
+        lateout("r8") _,
+        lateout("r9") _,
+        lateout("r10") _,
+        lateout("r11") _,
+        lateout("r12") _,
+        lateout("cr0") _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_noreturn(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> ! {
+    asm!(
+        "sc",
+        in("r0") nr.to_asm(),
+        in("r3") a0.to_asm(),
+        options(nostack, noreturn)
+    )
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "sc",
+        "bns 0f",
+        "neg 3, 3",
+        "0:",
+        inlateout("r0") nr.to_asm() => _,
+        inlateout("r3") a0.to_asm() => r0,
+        inlateout("r4") a1.to_asm() => _,
+        lateout("r5") _,
+        lateout("r6") _,
+        lateout("r7") _,
+        lateout("r8") _,
+        lateout("r9") _,
+        lateout("r10") _,
+        lateout("r11") _,
+        lateout("r12") _,
+        lateout("cr0") _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "sc",
+        "bns 0f",
+        "neg 3, 3",
+        "0:",
+        inlateout("r0") nr.to_asm() => _,
+        inlateout("r3") a0.to_asm() => r0,
+        inlateout("r4") a1.to_asm() => _,
+        lateout("r5") _,
+        lateout("r6") _,
+        lateout("r7") _,
+        lateout("r8") _,
+        lateout("r9") _,
+        lateout("r10") _,
+        lateout("r11") _,
+        lateout("r12") _,
+        lateout("cr0") _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "sc",
+        "bns 0f",
+        "neg 3, 3",
+        "0:",
+        inlateout("r0") nr.to_asm() => _,
+        inlateout("r3") a0.to_asm() => r0,
+        inlateout("r4") a1.to_asm() => _,
+        inlateout("r5") a2.to_asm() => _,
+        lateout("r6") _,
+        lateout("r7") _,
+        lateout("r8") _,
+        lateout("r9") _,
+        lateout("r10") _,
+        lateout("r11") _,
+        lateout("r12") _,
+        lateout("cr0") _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "sc",
+        "bns 0f",
+        "neg 3, 3",
+        "0:",
+        inlateout("r0") nr.to_asm() => _,
+        inlateout("r3") a0.to_asm() => r0,
+        inlateout("r4") a1.to_asm() => _,
+        inlateout("r5") a2.to_asm() => _,
+        lateout("r6") _,
+        lateout("r7") _,
+        lateout("r8") _,
+        lateout("r9") _,
+        lateout("r10") _,
+        lateout("r11") _,
+        lateout("r12") _,
+        lateout("cr0") _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "sc",
+        "bns 0f",
+        "neg 3, 3",
+        "0:",
+        inlateout("r0") nr.to_asm() => _,
+        inlateout("r3") a0.to_asm() => r0,
+        inlateout("r4") a1.to_asm() => _,
+        inlateout("r5") a2.to_asm() => _,
+        inlateout("r6") a3.to_asm() => _,
+        lateout("r7") _,
+        lateout("r8") _,
+        lateout("r9") _,
+        lateout("r10") _,
+        lateout("r11") _,
+        lateout("r12") _,
+        lateout("cr0") _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "sc",
+        "bns 0f",
+        "neg 3, 3",
+        "0:",
+        inlateout("r0") nr.to_asm() => _,
+        inlateout("r3") a0.to_asm() => r0,
+        inlateout("r4") a1.to_asm() => _,
+        inlateout("r5") a2.to_asm() => _,
+        inlateout("r6") a3.to_asm() => _,
+        lateout("r7") _,
+        lateout("r8") _,
+        lateout("r9") _,
+        lateout("r10") _,
+        lateout("r11") _,
+        lateout("r12") _,
+        lateout("cr0") _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "sc",
+        "bns 0f",
+        "neg 3, 3",
+        "0:",
+        inlateout("r0") nr.to_asm() => _,
+        inlateout("r3") a0.to_asm() => r0,
+        inlateout("r4") a1.to_asm() => _,
+        inlateout("r5") a2.to_asm() => _,
+        inlateout("r6") a3.to_asm() => _,
+        inlateout("r7") a4.to_asm() => _,
+        lateout("r8") _,
+        lateout("r9") _,
+        lateout("r10") _,
+        lateout("r11") _,
+        lateout("r12") _,
+        lateout("cr0") _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "sc",
+        "bns 0f",
+        "neg 3, 3",
+        "0:",
+        inlateout("r0") nr.to_asm() => _,
+        inlateout("r3") a0.to_asm() => r0,
+        inlateout("r4") a1.to_asm() => _,
+        inlateout("r5") a2.to_asm() => _,
+        inlateout("r6") a3.to_asm() => _,
+        inlateout("r7") a4.to_asm() => _,
+        lateout("r8") _,
+        lateout("r9") _,
+        lateout("r10") _,
+        lateout("r11") _,
+        lateout("r12") _,
+        lateout("cr0") _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "sc",
+        "bns 0f",
+        "neg 3, 3",
+        "0:",
+        inlateout("r0") nr.to_asm() => _,
+        inlateout("r3") a0.to_asm() => r0,
+        inlateout("r4") a1.to_asm() => _,
+        inlateout("r5") a2.to_asm() => _,
+        inlateout("r6") a3.to_asm() => _,
+        inlateout("r7") a4.to_asm() => _,
+        inlateout("r8") a5.to_asm() => _,
+        lateout("r9") _,
+        lateout("r10") _,
+        lateout("r11") _,
+        lateout("r12") _,
+        lateout("cr0") _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "sc",
+        "bns 0f",
+        "neg 3, 3",
+        "0:",
+        inlateout("r0") nr.to_asm() => _,
+        inlateout("r3") a0.to_asm() => r0,
+        inlateout("r4") a1.to_asm() => _,
+        inlateout("r5") a2.to_asm() => _,
+        inlateout("r6") a3.to_asm() => _,
+        inlateout("r7") a4.to_asm() => _,
+        inlateout("r8") a5.to_asm() => _,
+        lateout("r9") _,
+        lateout("r10") _,
+        lateout("r11") _,
+        lateout("r12") _,
+        lateout("cr0") _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
diff --git a/vendor/rustix/src/backend/linux_raw/arch/riscv64.rs b/vendor/rustix/src/backend/linux_raw/arch/riscv64.rs
new file mode 100644
index 0000000..7b8533d
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/arch/riscv64.rs
@@ -0,0 +1,265 @@
+//! riscv64 Linux system calls.
+
+use crate::backend::reg::{
+    ArgReg, FromAsm, RetReg, SyscallNumber, ToAsm, A0, A1, A2, A3, A4, A5, R0,
+};
+use core::arch::asm;
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall0_readonly(nr: SyscallNumber<'_>) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "ecall",
+        in("a7") nr.to_asm(),
+        lateout("a0") r0,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "ecall",
+        in("a7") nr.to_asm(),
+        inlateout("a0") a0.to_asm() => r0,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "ecall",
+        in("a7") nr.to_asm(),
+        inlateout("a0") a0.to_asm() => r0,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_noreturn(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> ! {
+    asm!(
+        "ecall",
+        in("a7") nr.to_asm(),
+        in("a0") a0.to_asm(),
+        options(nostack, noreturn)
+    );
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "ecall",
+        in("a7") nr.to_asm(),
+        inlateout("a0") a0.to_asm() => r0,
+        in("a1") a1.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "ecall",
+        in("a7") nr.to_asm(),
+        inlateout("a0") a0.to_asm() => r0,
+        in("a1") a1.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "ecall",
+        in("a7") nr.to_asm(),
+        inlateout("a0") a0.to_asm() => r0,
+        in("a1") a1.to_asm(),
+        in("a2") a2.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "ecall",
+        in("a7") nr.to_asm(),
+        inlateout("a0") a0.to_asm() => r0,
+        in("a1") a1.to_asm(),
+        in("a2") a2.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "ecall",
+        in("a7") nr.to_asm(),
+        inlateout("a0") a0.to_asm() => r0,
+        in("a1") a1.to_asm(),
+        in("a2") a2.to_asm(),
+        in("a3") a3.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "ecall",
+        in("a7") nr.to_asm(),
+        inlateout("a0") a0.to_asm() => r0,
+        in("a1") a1.to_asm(),
+        in("a2") a2.to_asm(),
+        in("a3") a3.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "ecall",
+        in("a7") nr.to_asm(),
+        inlateout("a0") a0.to_asm() => r0,
+        in("a1") a1.to_asm(),
+        in("a2") a2.to_asm(),
+        in("a3") a3.to_asm(),
+        in("a4") a4.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "ecall",
+        in("a7") nr.to_asm(),
+        inlateout("a0") a0.to_asm() => r0,
+        in("a1") a1.to_asm(),
+        in("a2") a2.to_asm(),
+        in("a3") a3.to_asm(),
+        in("a4") a4.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "ecall",
+        in("a7") nr.to_asm(),
+        inlateout("a0") a0.to_asm() => r0,
+        in("a1") a1.to_asm(),
+        in("a2") a2.to_asm(),
+        in("a3") a3.to_asm(),
+        in("a4") a4.to_asm(),
+        in("a5") a5.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "ecall",
+        in("a7") nr.to_asm(),
+        inlateout("a0") a0.to_asm() => r0,
+        in("a1") a1.to_asm(),
+        in("a2") a2.to_asm(),
+        in("a3") a3.to_asm(),
+        in("a4") a4.to_asm(),
+        in("a5") a5.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
diff --git a/vendor/rustix/src/backend/linux_raw/arch/thumb.rs b/vendor/rustix/src/backend/linux_raw/arch/thumb.rs
new file mode 100644
index 0000000..73f9c1c
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/arch/thumb.rs
@@ -0,0 +1,322 @@
+//! arm Linux system calls, using thumb-mode.
+//!
+//! In thumb-mode, r7 is the frame pointer and is not permitted to be used in
+//! an inline asm operand, so we have to use a different register and copy it
+//! into r7 inside the inline asm.
+
+use crate::backend::reg::{
+    ArgReg, FromAsm, RetReg, SyscallNumber, ToAsm, A0, A1, A2, A3, A4, A5, R0,
+};
+use core::arch::asm;
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall0_readonly(nr: SyscallNumber<'_>) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "mov {tmp}, r7",
+        "mov r7, {nr}",
+        "svc 0",
+        "mov r7, {tmp}",
+        nr = in(reg) nr.to_asm(),
+        tmp = out(reg) _,
+        lateout("r0") r0,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "mov {tmp}, r7",
+        "mov r7, {nr}",
+        "svc 0",
+        "mov r7, {tmp}",
+        nr = in(reg) nr.to_asm(),
+        tmp = out(reg) _,
+        inlateout("r0") a0.to_asm() => r0,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "mov {tmp}, r7",
+        "mov r7, {nr}",
+        "svc 0",
+        "mov r7, {tmp}",
+        nr = in(reg) nr.to_asm(),
+        tmp = out(reg) _,
+        inlateout("r0") a0.to_asm() => r0,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_noreturn(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> ! {
+    asm!(
+        "mov r7, {nr}",
+        "svc 0",
+        nr = in(reg) nr.to_asm(),
+        in("r0") a0.to_asm(),
+        options(nostack, noreturn)
+    )
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "mov {tmp}, r7",
+        "mov r7, {nr}",
+        "svc 0",
+        "mov r7, {tmp}",
+        nr = in(reg) nr.to_asm(),
+        tmp = out(reg) _,
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "mov {tmp}, r7",
+        "mov r7, {nr}",
+        "svc 0",
+        "mov r7, {tmp}",
+        nr = in(reg) nr.to_asm(),
+        tmp = out(reg) _,
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "mov {tmp}, r7",
+        "mov r7, {nr}",
+        "svc 0",
+        "mov r7, {tmp}",
+        nr = in(reg) nr.to_asm(),
+        tmp = out(reg) _,
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "mov {tmp}, r7",
+        "mov r7, {nr}",
+        "svc 0",
+        "mov r7, {tmp}",
+        nr = in(reg) nr.to_asm(),
+        tmp = out(reg) _,
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "mov {tmp}, r7",
+        "mov r7, {nr}",
+        "svc 0",
+        "mov r7, {tmp}",
+        nr = in(reg) nr.to_asm(),
+        tmp = out(reg) _,
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        in("r3") a3.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "mov {tmp}, r7",
+        "mov r7, {nr}",
+        "svc 0",
+        "mov r7, {tmp}",
+        nr = in(reg) nr.to_asm(),
+        tmp = out(reg) _,
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        in("r3") a3.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "mov {tmp}, r7",
+        "mov r7, {nr}",
+        "svc 0",
+        "mov r7, {tmp}",
+        nr = in(reg) nr.to_asm(),
+        tmp = out(reg) _,
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        in("r3") a3.to_asm(),
+        in("r4") a4.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "mov {tmp}, r7",
+        "mov r7, {nr}",
+        "svc 0",
+        "mov r7, {tmp}",
+        nr = in(reg) nr.to_asm(),
+        tmp = out(reg) _,
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        in("r3") a3.to_asm(),
+        in("r4") a4.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "mov {tmp}, r7",
+        "mov r7, {nr}",
+        "svc 0",
+        "mov r7, {tmp}",
+        nr = in(reg) nr.to_asm(),
+        tmp = out(reg) _,
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        in("r3") a3.to_asm(),
+        in("r4") a4.to_asm(),
+        in("r5") a5.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "mov {tmp}, r7",
+        "mov r7, {nr}",
+        "svc 0",
+        "mov r7, {tmp}",
+        nr = in(reg) nr.to_asm(),
+        tmp = out(reg) _,
+        inlateout("r0") a0.to_asm() => r0,
+        in("r1") a1.to_asm(),
+        in("r2") a2.to_asm(),
+        in("r3") a3.to_asm(),
+        in("r4") a4.to_asm(),
+        in("r5") a5.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
diff --git a/vendor/rustix/src/backend/linux_raw/arch/x86.rs b/vendor/rustix/src/backend/linux_raw/arch/x86.rs
new file mode 100644
index 0000000..e789181
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/arch/x86.rs
@@ -0,0 +1,489 @@
+//! 32-bit x86 Linux system calls.
+//!
+//! There are two forms; `indirect_*` which take a callee, which allow calling
+//! through the vDSO when possible, and plain forms, which use the `int 0x80`
+//! instruction.
+//!
+//! Most `rustix` syscalls use the vsyscall mechanism rather than going using
+//! `int 0x80` sequences, as vsyscall is much faster.
+//!
+//! Syscalls made with `int 0x80` preserve the flags register, while syscalls
+//! made using vsyscall do not.
+
+#![allow(dead_code)]
+
+use crate::backend::reg::{
+    ArgReg, FromAsm, RetReg, SyscallNumber, ToAsm, A0, A1, A2, A3, A4, A5, R0,
+};
+use crate::backend::vdso_wrappers::SyscallType;
+use core::arch::asm;
+
+#[inline]
+pub(in crate::backend) unsafe fn indirect_syscall0(
+    callee: SyscallType,
+    nr: SyscallNumber<'_>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "call {callee}",
+        callee = in(reg) callee,
+        inlateout("eax") nr.to_asm() => r0,
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn indirect_syscall1(
+    callee: SyscallType,
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "call {callee}",
+        callee = in(reg) callee,
+        inlateout("eax") nr.to_asm() => r0,
+        in("ebx") a0.to_asm(),
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn indirect_syscall1_noreturn(
+    callee: SyscallType,
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+) -> ! {
+    asm!(
+        "call {callee}",
+        callee = in(reg) callee,
+        in("eax") nr.to_asm(),
+        in("ebx") a0.to_asm(),
+        options(noreturn)
+    )
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn indirect_syscall2(
+    callee: SyscallType,
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "call {callee}",
+        callee = in(reg) callee,
+        inlateout("eax") nr.to_asm() => r0,
+        in("ebx") a0.to_asm(),
+        in("ecx") a1.to_asm(),
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn indirect_syscall3(
+    callee: SyscallType,
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "call {callee}",
+        callee = in(reg) callee,
+        inlateout("eax") nr.to_asm() => r0,
+        in("ebx") a0.to_asm(),
+        in("ecx") a1.to_asm(),
+        in("edx") a2.to_asm(),
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn indirect_syscall4(
+    callee: SyscallType,
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let r0;
+    // a3 should go in esi, but `asm!` won't let us use it as an operand.
+    // Temporarily swap it into place, and then swap it back afterward.
+    //
+    // We hard-code the callee operand to use edi instead of `in(reg)` because
+    // even though we can't name esi as an operand, the compiler can use esi to
+    // satisfy `in(reg)`.
+    asm!(
+        "xchg esi, {a3}",
+        "call edi",
+        "xchg esi, {a3}",
+        a3 = in(reg) a3.to_asm(),
+        in("edi") callee,
+        inlateout("eax") nr.to_asm() => r0,
+        in("ebx") a0.to_asm(),
+        in("ecx") a1.to_asm(),
+        in("edx") a2.to_asm(),
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn indirect_syscall5(
+    callee: SyscallType,
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let r0;
+    // Oof. a3 should go in esi, and `asm!` won't let us use that register as
+    // an operand. And we can't request stack slots. And there are no other
+    // registers free. Use eax as a temporary pointer to a slice, since it gets
+    // clobbered as the return value anyway.
+    asm!(
+        "push esi",
+        "push [eax + 0]",
+        "mov esi, [eax + 4]",
+        "mov eax, [eax + 8]",
+        "call [esp]",
+        "pop esi",
+        "pop esi",
+        inout("eax") &[callee as _, a3.to_asm(), nr.to_asm()] => r0,
+        in("ebx") a0.to_asm(),
+        in("ecx") a1.to_asm(),
+        in("edx") a2.to_asm(),
+        in("edi") a4.to_asm(),
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn indirect_syscall6(
+    callee: SyscallType,
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let r0;
+    // Oof again. a3 should go in esi, and a5 should go in ebp, and `asm!`
+    // won't let us use either of those registers as operands. And we can't
+    // request stack slots. And there are no other registers free. Use eax as a
+    // temporary pointer to a slice, since it gets clobbered as the return
+    // value anyway.
+    //
+    // This is another reason that syscalls should be compiler intrinsics
+    // rather than inline asm.
+    asm!(
+        "push ebp",
+        "push esi",
+        "push [eax + 0]",
+        "mov esi, [eax + 4]",
+        "mov ebp, [eax + 8]",
+        "mov eax, [eax + 12]",
+        "call [esp]",
+        "pop esi",
+        "pop esi",
+        "pop ebp",
+        inout("eax") &[callee as _, a3.to_asm(), a5.to_asm(), nr.to_asm()] => r0,
+        in("ebx") a0.to_asm(),
+        in("ecx") a1.to_asm(),
+        in("edx") a2.to_asm(),
+        in("edi") a4.to_asm(),
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall0_readonly(nr: SyscallNumber<'_>) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "int $$0x80",
+        inlateout("eax") nr.to_asm() => r0,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "int $$0x80",
+        inlateout("eax") nr.to_asm() => r0,
+        in("ebx") a0.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "int $$0x80",
+        inlateout("eax") nr.to_asm() => r0,
+        in("ebx") a0.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_noreturn(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> ! {
+    asm!(
+        "int $$0x80",
+        in("eax") nr.to_asm(),
+        in("ebx") a0.to_asm(),
+        options(nostack, noreturn)
+    )
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "int $$0x80",
+        inlateout("eax") nr.to_asm() => r0,
+        in("ebx") a0.to_asm(),
+        in("ecx") a1.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "int $$0x80",
+        inlateout("eax") nr.to_asm() => r0,
+        in("ebx") a0.to_asm(),
+        in("ecx") a1.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "int $$0x80",
+        inlateout("eax") nr.to_asm() => r0,
+        in("ebx") a0.to_asm(),
+        in("ecx") a1.to_asm(),
+        in("edx") a2.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "int $$0x80",
+        inlateout("eax") nr.to_asm() => r0,
+        in("ebx") a0.to_asm(),
+        in("ecx") a1.to_asm(),
+        in("edx") a2.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let r0;
+    // a3 should go in esi, but `asm!` won't let us use it as an operand.
+    // Temporarily swap it into place, and then swap it back afterward.
+    asm!(
+        "xchg esi, {a3}",
+        "int $$0x80",
+        "xchg esi, {a3}",
+        a3 = in(reg) a3.to_asm(),
+        inlateout("eax") nr.to_asm() => r0,
+        in("ebx") a0.to_asm(),
+        in("ecx") a1.to_asm(),
+        in("edx") a2.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "xchg esi, {a3}",
+        "int $$0x80",
+        "xchg esi, {a3}",
+        a3 = in(reg) a3.to_asm(),
+        inlateout("eax") nr.to_asm() => r0,
+        in("ebx") a0.to_asm(),
+        in("ecx") a1.to_asm(),
+        in("edx") a2.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let r0;
+    // As in `syscall4`, use xchg to handle a3. a4 should go in edi, and we can
+    // use that register as an operand. Unlike in `indirect_syscall5`, we don't
+    // have a `callee` operand taking up a register, so we have enough
+    // registers and don't need to use a slice.
+    asm!(
+        "xchg esi, {a3}",
+        "int $$0x80",
+        "xchg esi, {a3}",
+        a3 = in(reg) a3.to_asm(),
+        inlateout("eax") nr.to_asm() => r0,
+        in("ebx") a0.to_asm(),
+        in("ecx") a1.to_asm(),
+        in("edx") a2.to_asm(),
+        in("edi") a4.to_asm(),
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let r0;
+    // See the comments in `syscall5`.
+    asm!(
+        "xchg esi, {a3}",
+        "int $$0x80",
+        "xchg esi, {a3}",
+        a3 = in(reg) a3.to_asm(),
+        inlateout("eax") nr.to_asm() => r0,
+        in("ebx") a0.to_asm(),
+        in("ecx") a1.to_asm(),
+        in("edx") a2.to_asm(),
+        in("edi") a4.to_asm(),
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let r0;
+    // See the comments in `indirect_syscall6`.
+    asm!(
+        "push ebp",
+        "push esi",
+        "mov esi, [eax + 0]",
+        "mov ebp, [eax + 4]",
+        "mov eax, [eax + 8]",
+        "int $$0x80",
+        "pop esi",
+        "pop ebp",
+        inout("eax") &[a3.to_asm(), a5.to_asm(), nr.to_asm()] => r0,
+        in("ebx") a0.to_asm(),
+        in("ecx") a1.to_asm(),
+        in("edx") a2.to_asm(),
+        in("edi") a4.to_asm(),
+        options(preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let r0;
+    // See the comments in `indirect_syscall6`.
+    asm!(
+        "push ebp",
+        "push esi",
+        "mov esi, [eax + 0]",
+        "mov ebp, [eax + 4]",
+        "mov eax, [eax + 8]",
+        "int $$0x80",
+        "pop esi",
+        "pop ebp",
+        inout("eax") &[a3.to_asm(), a5.to_asm(), nr.to_asm()] => r0,
+        in("ebx") a0.to_asm(),
+        in("ecx") a1.to_asm(),
+        in("edx") a2.to_asm(),
+        in("edi") a4.to_asm(),
+        options(preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
diff --git a/vendor/rustix/src/backend/linux_raw/arch/x86_64.rs b/vendor/rustix/src/backend/linux_raw/arch/x86_64.rs
new file mode 100644
index 0000000..62f35d9
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/arch/x86_64.rs
@@ -0,0 +1,293 @@
+//! x86-64 Linux system calls.
+
+use crate::backend::reg::{
+    ArgReg, FromAsm, RetReg, SyscallNumber, ToAsm, A0, A1, A2, A3, A4, A5, R0,
+};
+use core::arch::asm;
+
+#[cfg(target_pointer_width = "32")]
+compile_error!("x32 is not yet supported");
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall0_readonly(nr: SyscallNumber<'_>) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "syscall",
+        inlateout("rax") nr.to_asm() => r0,
+        lateout("rcx") _,
+        lateout("r11") _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "syscall",
+        inlateout("rax") nr.to_asm() => r0,
+        in("rdi") a0.to_asm(),
+        lateout("rcx") _,
+        lateout("r11") _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "syscall",
+        inlateout("rax") nr.to_asm() => r0,
+        in("rdi") a0.to_asm(),
+        lateout("rcx") _,
+        lateout("r11") _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall1_noreturn(nr: SyscallNumber<'_>, a0: ArgReg<'_, A0>) -> ! {
+    asm!(
+        "syscall",
+        in("rax") nr.to_asm(),
+        in("rdi") a0.to_asm(),
+        options(nostack, noreturn)
+    )
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "syscall",
+        inlateout("rax") nr.to_asm() => r0,
+        in("rdi") a0.to_asm(),
+        in("rsi") a1.to_asm(),
+        lateout("rcx") _,
+        lateout("r11") _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall2_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "syscall",
+        inlateout("rax") nr.to_asm() => r0,
+        in("rdi") a0.to_asm(),
+        in("rsi") a1.to_asm(),
+        lateout("rcx") _,
+        lateout("r11") _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "syscall",
+        inlateout("rax") nr.to_asm() => r0,
+        in("rdi") a0.to_asm(),
+        in("rsi") a1.to_asm(),
+        in("rdx") a2.to_asm(),
+        lateout("rcx") _,
+        lateout("r11") _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall3_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "syscall",
+        inlateout("rax") nr.to_asm() => r0,
+        in("rdi") a0.to_asm(),
+        in("rsi") a1.to_asm(),
+        in("rdx") a2.to_asm(),
+        lateout("rcx") _,
+        lateout("r11") _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "syscall",
+        inlateout("rax") nr.to_asm() => r0,
+        in("rdi") a0.to_asm(),
+        in("rsi") a1.to_asm(),
+        in("rdx") a2.to_asm(),
+        in("r10") a3.to_asm(),
+        lateout("rcx") _,
+        lateout("r11") _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall4_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "syscall",
+        inlateout("rax") nr.to_asm() => r0,
+        in("rdi") a0.to_asm(),
+        in("rsi") a1.to_asm(),
+        in("rdx") a2.to_asm(),
+        in("r10") a3.to_asm(),
+        lateout("rcx") _,
+        lateout("r11") _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "syscall",
+        inlateout("rax") nr.to_asm() => r0,
+        in("rdi") a0.to_asm(),
+        in("rsi") a1.to_asm(),
+        in("rdx") a2.to_asm(),
+        in("r10") a3.to_asm(),
+        in("r8") a4.to_asm(),
+        lateout("rcx") _,
+        lateout("r11") _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall5_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "syscall",
+        inlateout("rax") nr.to_asm() => r0,
+        in("rdi") a0.to_asm(),
+        in("rsi") a1.to_asm(),
+        in("rdx") a2.to_asm(),
+        in("r10") a3.to_asm(),
+        in("r8") a4.to_asm(),
+        lateout("rcx") _,
+        lateout("r11") _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "syscall",
+        inlateout("rax") nr.to_asm() => r0,
+        in("rdi") a0.to_asm(),
+        in("rsi") a1.to_asm(),
+        in("rdx") a2.to_asm(),
+        in("r10") a3.to_asm(),
+        in("r8") a4.to_asm(),
+        in("r9") a5.to_asm(),
+        lateout("rcx") _,
+        lateout("r11") _,
+        options(nostack, preserves_flags)
+    );
+    FromAsm::from_asm(r0)
+}
+
+#[inline]
+pub(in crate::backend) unsafe fn syscall6_readonly(
+    nr: SyscallNumber<'_>,
+    a0: ArgReg<'_, A0>,
+    a1: ArgReg<'_, A1>,
+    a2: ArgReg<'_, A2>,
+    a3: ArgReg<'_, A3>,
+    a4: ArgReg<'_, A4>,
+    a5: ArgReg<'_, A5>,
+) -> RetReg<R0> {
+    let r0;
+    asm!(
+        "syscall",
+        inlateout("rax") nr.to_asm() => r0,
+        in("rdi") a0.to_asm(),
+        in("rsi") a1.to_asm(),
+        in("rdx") a2.to_asm(),
+        in("r10") a3.to_asm(),
+        in("r8") a4.to_asm(),
+        in("r9") a5.to_asm(),
+        lateout("rcx") _,
+        lateout("r11") _,
+        options(nostack, preserves_flags, readonly)
+    );
+    FromAsm::from_asm(r0)
+}
diff --git a/vendor/rustix/src/backend/linux_raw/c.rs b/vendor/rustix/src/backend/linux_raw/c.rs
new file mode 100644
index 0000000..edc9eb8
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/c.rs
@@ -0,0 +1,304 @@
+//! Adapt the Linux API to resemble a POSIX-style libc API.
+//!
+//! The linux_raw backend doesn't use actual libc; this just defines certain
+//! types that are convenient to have defined.
+
+#![allow(unused_imports)]
+#![allow(non_camel_case_types)]
+
+pub(crate) type size_t = usize;
+pub(crate) use linux_raw_sys::ctypes::*;
+pub(crate) use linux_raw_sys::errno::EINVAL;
+pub(crate) use linux_raw_sys::ioctl::{FIONBIO, FIONREAD};
+// Import the kernel's `uid_t` and `gid_t` if they're 32-bit.
+#[cfg(not(any(target_arch = "arm", target_arch = "sparc", target_arch = "x86")))]
+pub(crate) use linux_raw_sys::general::{__kernel_gid_t as gid_t, __kernel_uid_t as uid_t};
+pub(crate) use linux_raw_sys::general::{
+    __kernel_pid_t as pid_t, __kernel_time64_t as time_t, __kernel_timespec as timespec, iovec,
+    O_CLOEXEC, O_NOCTTY, O_NONBLOCK, O_RDWR,
+};
+
+#[cfg(feature = "event")]
+#[cfg(test)]
+pub(crate) use linux_raw_sys::general::epoll_event;
+
+#[cfg(any(
+    feature = "fs",
+    all(
+        not(feature = "use-libc-auxv"),
+        not(feature = "use-explicitly-provided-auxv"),
+        any(
+            feature = "param",
+            feature = "process",
+            feature = "runtime",
+            feature = "time",
+            target_arch = "x86",
+        )
+    )
+))]
+pub(crate) use linux_raw_sys::general::{
+    AT_FDCWD, NFS_SUPER_MAGIC, O_LARGEFILE, PROC_SUPER_MAGIC, UTIME_NOW, UTIME_OMIT, XATTR_CREATE,
+    XATTR_REPLACE,
+};
+
+pub(crate) use linux_raw_sys::ioctl::{BLKPBSZGET, BLKSSZGET, FICLONE};
+
+#[cfg(feature = "io_uring")]
+pub(crate) use linux_raw_sys::{general::open_how, io_uring::*};
+
+#[cfg(feature = "net")]
+pub(crate) use linux_raw_sys::{
+    cmsg_macros::*,
+    general::{O_CLOEXEC as SOCK_CLOEXEC, O_NONBLOCK as SOCK_NONBLOCK},
+    if_ether::*,
+    net::{
+        linger, msghdr, sockaddr, sockaddr_in, sockaddr_in6, sockaddr_un, socklen_t, AF_DECnet,
+        __kernel_sa_family_t as sa_family_t, __kernel_sockaddr_storage as sockaddr_storage,
+        cmsghdr, in6_addr, in_addr, ip_mreq, ip_mreq_source, ip_mreqn, ipv6_mreq, AF_APPLETALK,
+        AF_ASH, AF_ATMPVC, AF_ATMSVC, AF_AX25, AF_BLUETOOTH, AF_BRIDGE, AF_CAN, AF_ECONET,
+        AF_IEEE802154, AF_INET, AF_INET6, AF_IPX, AF_IRDA, AF_ISDN, AF_IUCV, AF_KEY, AF_LLC,
+        AF_NETBEUI, AF_NETLINK, AF_NETROM, AF_PACKET, AF_PHONET, AF_PPPOX, AF_RDS, AF_ROSE,
+        AF_RXRPC, AF_SECURITY, AF_SNA, AF_TIPC, AF_UNIX, AF_UNSPEC, AF_WANPIPE, AF_X25,
+        IP6T_SO_ORIGINAL_DST, IPPROTO_FRAGMENT, IPPROTO_ICMPV6, IPPROTO_MH, IPPROTO_ROUTING,
+        IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_FREEBIND, IPV6_MULTICAST_HOPS,
+        IPV6_MULTICAST_LOOP, IPV6_RECVTCLASS, IPV6_TCLASS, IPV6_UNICAST_HOPS, IPV6_V6ONLY,
+        IP_ADD_MEMBERSHIP, IP_ADD_SOURCE_MEMBERSHIP, IP_DROP_MEMBERSHIP, IP_DROP_SOURCE_MEMBERSHIP,
+        IP_FREEBIND, IP_MULTICAST_LOOP, IP_MULTICAST_TTL, IP_RECVTOS, IP_TOS, IP_TTL,
+        MSG_CMSG_CLOEXEC, MSG_CONFIRM, MSG_DONTROUTE, MSG_DONTWAIT, MSG_EOR, MSG_ERRQUEUE,
+        MSG_MORE, MSG_NOSIGNAL, MSG_OOB, MSG_PEEK, MSG_TRUNC, MSG_WAITALL, SCM_CREDENTIALS,
+        SCM_RIGHTS, SHUT_RD, SHUT_RDWR, SHUT_WR, SOCK_DGRAM, SOCK_RAW, SOCK_RDM, SOCK_SEQPACKET,
+        SOCK_STREAM, SOL_SOCKET, SO_ACCEPTCONN, SO_BROADCAST, SO_COOKIE, SO_DOMAIN, SO_ERROR,
+        SO_INCOMING_CPU, SO_KEEPALIVE, SO_LINGER, SO_OOBINLINE, SO_ORIGINAL_DST, SO_PASSCRED,
+        SO_PROTOCOL, SO_RCVBUF, SO_RCVTIMEO_NEW, SO_RCVTIMEO_NEW as SO_RCVTIMEO, SO_RCVTIMEO_OLD,
+        SO_REUSEADDR, SO_REUSEPORT, SO_SNDBUF, SO_SNDTIMEO_NEW, SO_SNDTIMEO_NEW as SO_SNDTIMEO,
+        SO_SNDTIMEO_OLD, SO_TYPE, TCP_CONGESTION, TCP_CORK, TCP_KEEPCNT, TCP_KEEPIDLE,
+        TCP_KEEPINTVL, TCP_NODELAY, TCP_QUICKACK, TCP_THIN_LINEAR_TIMEOUTS, TCP_USER_TIMEOUT,
+    },
+    netlink::*,
+};
+
+// Cast away bindgen's `enum` type to make these consistent with the other
+// `setsockopt`/`getsockopt` level values.
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_IP: u32 = linux_raw_sys::net::IPPROTO_IP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_ICMP: u32 = linux_raw_sys::net::IPPROTO_ICMP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_IGMP: u32 = linux_raw_sys::net::IPPROTO_IGMP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_IPIP: u32 = linux_raw_sys::net::IPPROTO_IPIP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_TCP: u32 = linux_raw_sys::net::IPPROTO_TCP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_EGP: u32 = linux_raw_sys::net::IPPROTO_EGP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_PUP: u32 = linux_raw_sys::net::IPPROTO_PUP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_UDP: u32 = linux_raw_sys::net::IPPROTO_UDP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_IDP: u32 = linux_raw_sys::net::IPPROTO_IDP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_TP: u32 = linux_raw_sys::net::IPPROTO_TP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_DCCP: u32 = linux_raw_sys::net::IPPROTO_DCCP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_IPV6: u32 = linux_raw_sys::net::IPPROTO_IPV6 as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_RSVP: u32 = linux_raw_sys::net::IPPROTO_RSVP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_GRE: u32 = linux_raw_sys::net::IPPROTO_GRE as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_ESP: u32 = linux_raw_sys::net::IPPROTO_ESP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_AH: u32 = linux_raw_sys::net::IPPROTO_AH as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_MTP: u32 = linux_raw_sys::net::IPPROTO_MTP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_BEETPH: u32 = linux_raw_sys::net::IPPROTO_BEETPH as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_ENCAP: u32 = linux_raw_sys::net::IPPROTO_ENCAP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_PIM: u32 = linux_raw_sys::net::IPPROTO_PIM as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_COMP: u32 = linux_raw_sys::net::IPPROTO_COMP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_SCTP: u32 = linux_raw_sys::net::IPPROTO_SCTP as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_UDPLITE: u32 = linux_raw_sys::net::IPPROTO_UDPLITE as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_MPLS: u32 = linux_raw_sys::net::IPPROTO_MPLS as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_ETHERNET: u32 = linux_raw_sys::net::IPPROTO_ETHERNET as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_RAW: u32 = linux_raw_sys::net::IPPROTO_RAW as _;
+#[cfg(feature = "net")]
+pub(crate) const IPPROTO_MPTCP: u32 = linux_raw_sys::net::IPPROTO_MPTCP as _;
+
+#[cfg(any(feature = "process", feature = "runtime"))]
+pub(crate) use linux_raw_sys::general::siginfo_t;
+
+#[cfg(any(feature = "process", feature = "runtime"))]
+pub(crate) const EXIT_SUCCESS: c_int = 0;
+#[cfg(any(feature = "process", feature = "runtime"))]
+pub(crate) const EXIT_FAILURE: c_int = 1;
+#[cfg(feature = "process")]
+pub(crate) const EXIT_SIGNALED_SIGABRT: c_int = 128 + linux_raw_sys::general::SIGABRT as c_int;
+#[cfg(feature = "runtime")]
+pub(crate) const CLONE_CHILD_SETTID: c_int = linux_raw_sys::general::CLONE_CHILD_SETTID as c_int;
+
+#[cfg(feature = "process")]
+pub(crate) use linux_raw_sys::{
+    general::{
+        CLD_CONTINUED, CLD_DUMPED, CLD_EXITED, CLD_KILLED, CLD_STOPPED, CLD_TRAPPED,
+        O_NONBLOCK as PIDFD_NONBLOCK, P_ALL, P_PGID, P_PID, P_PIDFD,
+    },
+    ioctl::TIOCSCTTY,
+};
+
+#[cfg(feature = "pty")]
+pub(crate) use linux_raw_sys::ioctl::TIOCGPTPEER;
+
+#[cfg(feature = "termios")]
+pub(crate) use linux_raw_sys::{
+    general::{
+        cc_t, speed_t, tcflag_t, termios, termios2, winsize, B0, B1000000, B110, B115200, B1152000,
+        B1200, B134, B150, B1500000, B1800, B19200, B200, B2000000, B230400, B2400, B2500000, B300,
+        B3000000, B3500000, B38400, B4000000, B460800, B4800, B50, B500000, B57600, B576000, B600,
+        B75, B921600, B9600, BOTHER, BRKINT, BS0, BS1, BSDLY, CBAUD, CBAUDEX, CIBAUD, CLOCAL,
+        CMSPAR, CR0, CR1, CR2, CR3, CRDLY, CREAD, CRTSCTS, CS5, CS6, CS7, CS8, CSIZE, CSTOPB, ECHO,
+        ECHOCTL, ECHOE, ECHOK, ECHOKE, ECHONL, ECHOPRT, EXTA, EXTB, EXTPROC, FF0, FF1, FFDLY,
+        FLUSHO, HUPCL, IBSHIFT, ICANON, ICRNL, IEXTEN, IGNBRK, IGNCR, IGNPAR, IMAXBEL, INLCR,
+        INPCK, ISIG, ISTRIP, IUCLC, IUTF8, IXANY, IXOFF, IXON, NCCS, NL0, NL1, NLDLY, NOFLSH,
+        OCRNL, OFDEL, OFILL, OLCUC, ONLCR, ONLRET, ONOCR, OPOST, PARENB, PARMRK, PARODD, PENDIN,
+        TAB0, TAB1, TAB2, TAB3, TABDLY, TCIFLUSH, TCIOFF, TCIOFLUSH, TCION, TCOFLUSH, TCOOFF,
+        TCOON, TCSADRAIN, TCSAFLUSH, TCSANOW, TOSTOP, VDISCARD, VEOF, VEOL, VEOL2, VERASE, VINTR,
+        VKILL, VLNEXT, VMIN, VQUIT, VREPRINT, VSTART, VSTOP, VSUSP, VSWTC, VT0, VT1, VTDLY, VTIME,
+        VWERASE, XCASE, XTABS,
+    },
+    ioctl::{TCGETS2, TCSETS2, TCSETSF2, TCSETSW2, TIOCEXCL, TIOCNXCL},
+};
+
+// On MIPS, `TCSANOW` et al have `TCSETS` added to them, so we need it to
+// subtract it out.
+#[cfg(all(
+    feature = "termios",
+    any(
+        target_arch = "mips",
+        target_arch = "mips32r6",
+        target_arch = "mips64",
+        target_arch = "mips64r6"
+    )
+))]
+pub(crate) use linux_raw_sys::ioctl::TCSETS;
+
+// Define our own `uid_t` and `gid_t` if the kernel's versions are not 32-bit.
+#[cfg(any(target_arch = "arm", target_arch = "sparc", target_arch = "x86"))]
+pub(crate) type uid_t = u32;
+#[cfg(any(target_arch = "arm", target_arch = "sparc", target_arch = "x86"))]
+pub(crate) type gid_t = u32;
+
+// Bindgen infers `u32` for many of these macro types which meant to be
+// used with `c_int` in the C APIs, so cast them to `c_int`.
+
+// Convert the signal constants from `u32` to `c_int`.
+pub(crate) const SIGHUP: c_int = linux_raw_sys::general::SIGHUP as _;
+pub(crate) const SIGINT: c_int = linux_raw_sys::general::SIGINT as _;
+pub(crate) const SIGQUIT: c_int = linux_raw_sys::general::SIGQUIT as _;
+pub(crate) const SIGILL: c_int = linux_raw_sys::general::SIGILL as _;
+pub(crate) const SIGTRAP: c_int = linux_raw_sys::general::SIGTRAP as _;
+pub(crate) const SIGABRT: c_int = linux_raw_sys::general::SIGABRT as _;
+pub(crate) const SIGBUS: c_int = linux_raw_sys::general::SIGBUS as _;
+pub(crate) const SIGFPE: c_int = linux_raw_sys::general::SIGFPE as _;
+pub(crate) const SIGKILL: c_int = linux_raw_sys::general::SIGKILL as _;
+pub(crate) const SIGUSR1: c_int = linux_raw_sys::general::SIGUSR1 as _;
+pub(crate) const SIGSEGV: c_int = linux_raw_sys::general::SIGSEGV as _;
+pub(crate) const SIGUSR2: c_int = linux_raw_sys::general::SIGUSR2 as _;
+pub(crate) const SIGPIPE: c_int = linux_raw_sys::general::SIGPIPE as _;
+pub(crate) const SIGALRM: c_int = linux_raw_sys::general::SIGALRM as _;
+pub(crate) const SIGTERM: c_int = linux_raw_sys::general::SIGTERM as _;
+#[cfg(not(any(
+    target_arch = "mips",
+    target_arch = "mips32r6",
+    target_arch = "mips64",
+    target_arch = "mips64r6",
+    target_arch = "sparc",
+    target_arch = "sparc64"
+)))]
+pub(crate) const SIGSTKFLT: c_int = linux_raw_sys::general::SIGSTKFLT as _;
+pub(crate) const SIGCHLD: c_int = linux_raw_sys::general::SIGCHLD as _;
+pub(crate) const SIGCONT: c_int = linux_raw_sys::general::SIGCONT as _;
+pub(crate) const SIGSTOP: c_int = linux_raw_sys::general::SIGSTOP as _;
+pub(crate) const SIGTSTP: c_int = linux_raw_sys::general::SIGTSTP as _;
+pub(crate) const SIGTTIN: c_int = linux_raw_sys::general::SIGTTIN as _;
+pub(crate) const SIGTTOU: c_int = linux_raw_sys::general::SIGTTOU as _;
+pub(crate) const SIGURG: c_int = linux_raw_sys::general::SIGURG as _;
+pub(crate) const SIGXCPU: c_int = linux_raw_sys::general::SIGXCPU as _;
+pub(crate) const SIGXFSZ: c_int = linux_raw_sys::general::SIGXFSZ as _;
+pub(crate) const SIGVTALRM: c_int = linux_raw_sys::general::SIGVTALRM as _;
+pub(crate) const SIGPROF: c_int = linux_raw_sys::general::SIGPROF as _;
+pub(crate) const SIGWINCH: c_int = linux_raw_sys::general::SIGWINCH as _;
+pub(crate) const SIGIO: c_int = linux_raw_sys::general::SIGIO as _;
+pub(crate) const SIGPWR: c_int = linux_raw_sys::general::SIGPWR as _;
+pub(crate) const SIGSYS: c_int = linux_raw_sys::general::SIGSYS as _;
+#[cfg(any(
+    target_arch = "mips",
+    target_arch = "mips32r6",
+    target_arch = "mips64",
+    target_arch = "mips64r6",
+    target_arch = "sparc",
+    target_arch = "sparc64"
+))]
+pub(crate) const SIGEMT: c_int = linux_raw_sys::general::SIGEMT as _;
+
+#[cfg(feature = "stdio")]
+pub(crate) const STDIN_FILENO: c_int = linux_raw_sys::general::STDIN_FILENO as _;
+#[cfg(feature = "stdio")]
+pub(crate) const STDOUT_FILENO: c_int = linux_raw_sys::general::STDOUT_FILENO as _;
+#[cfg(feature = "stdio")]
+pub(crate) const STDERR_FILENO: c_int = linux_raw_sys::general::STDERR_FILENO as _;
+
+pub(crate) const PIPE_BUF: usize = linux_raw_sys::general::PIPE_BUF as _;
+
+pub(crate) const CLOCK_MONOTONIC: c_int = linux_raw_sys::general::CLOCK_MONOTONIC as _;
+pub(crate) const CLOCK_REALTIME: c_int = linux_raw_sys::general::CLOCK_REALTIME as _;
+pub(crate) const CLOCK_MONOTONIC_RAW: c_int = linux_raw_sys::general::CLOCK_MONOTONIC_RAW as _;
+pub(crate) const CLOCK_MONOTONIC_COARSE: c_int =
+    linux_raw_sys::general::CLOCK_MONOTONIC_COARSE as _;
+pub(crate) const CLOCK_REALTIME_COARSE: c_int = linux_raw_sys::general::CLOCK_REALTIME_COARSE as _;
+pub(crate) const CLOCK_THREAD_CPUTIME_ID: c_int =
+    linux_raw_sys::general::CLOCK_THREAD_CPUTIME_ID as _;
+pub(crate) const CLOCK_PROCESS_CPUTIME_ID: c_int =
+    linux_raw_sys::general::CLOCK_PROCESS_CPUTIME_ID as _;
+#[cfg(any(feature = "thread", feature = "time", target_arch = "x86"))]
+pub(crate) const CLOCK_BOOTTIME: c_int = linux_raw_sys::general::CLOCK_BOOTTIME as _;
+#[cfg(any(feature = "thread", feature = "time", target_arch = "x86"))]
+pub(crate) const CLOCK_BOOTTIME_ALARM: c_int = linux_raw_sys::general::CLOCK_BOOTTIME_ALARM as _;
+#[cfg(any(feature = "thread", feature = "time", target_arch = "x86"))]
+pub(crate) const CLOCK_TAI: c_int = linux_raw_sys::general::CLOCK_TAI as _;
+#[cfg(any(feature = "thread", feature = "time", target_arch = "x86"))]
+pub(crate) const CLOCK_REALTIME_ALARM: c_int = linux_raw_sys::general::CLOCK_REALTIME_ALARM as _;
+
+#[cfg(feature = "system")]
+mod reboot_symbols {
+    use super::c_int;
+
+    pub(crate) const LINUX_REBOOT_MAGIC1: c_int = linux_raw_sys::general::LINUX_REBOOT_MAGIC1 as _;
+    pub(crate) const LINUX_REBOOT_MAGIC2: c_int = linux_raw_sys::general::LINUX_REBOOT_MAGIC2 as _;
+
+    pub(crate) const LINUX_REBOOT_CMD_RESTART: c_int =
+        linux_raw_sys::general::LINUX_REBOOT_CMD_RESTART as _;
+    pub(crate) const LINUX_REBOOT_CMD_HALT: c_int =
+        linux_raw_sys::general::LINUX_REBOOT_CMD_HALT as _;
+    pub(crate) const LINUX_REBOOT_CMD_CAD_ON: c_int =
+        linux_raw_sys::general::LINUX_REBOOT_CMD_CAD_ON as _;
+    pub(crate) const LINUX_REBOOT_CMD_CAD_OFF: c_int =
+        linux_raw_sys::general::LINUX_REBOOT_CMD_CAD_OFF as _;
+    pub(crate) const LINUX_REBOOT_CMD_POWER_OFF: c_int =
+        linux_raw_sys::general::LINUX_REBOOT_CMD_POWER_OFF as _;
+    pub(crate) const LINUX_REBOOT_CMD_SW_SUSPEND: c_int =
+        linux_raw_sys::general::LINUX_REBOOT_CMD_SW_SUSPEND as _;
+    pub(crate) const LINUX_REBOOT_CMD_KEXEC: c_int =
+        linux_raw_sys::general::LINUX_REBOOT_CMD_KEXEC as _;
+}
+#[cfg(feature = "system")]
+pub(crate) use reboot_symbols::*;
diff --git a/vendor/rustix/src/backend/linux_raw/conv.rs b/vendor/rustix/src/backend/linux_raw/conv.rs
new file mode 100644
index 0000000..f0de45a
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/conv.rs
@@ -0,0 +1,1019 @@
+//! Convert values to [`ArgReg`] and from [`RetReg`].
+//!
+//! System call arguments and return values are all communicated with inline
+//! asm and FFI as `*mut Opaque`. To protect these raw pointers from escaping
+//! or being accidentally misused as they travel through the code, we wrap them
+//! in [`ArgReg`] and [`RetReg`] structs. This file provides `From`
+//! implementations and explicit conversion functions for converting values
+//! into and out of these wrapper structs.
+//!
+//! # Safety
+//!
+//! Some of this code is `unsafe` in order to work with raw file descriptors,
+//! and some is `unsafe` to interpret the values in a `RetReg`.
+#![allow(unsafe_code)]
+
+use super::c;
+use super::fd::{AsRawFd, BorrowedFd, FromRawFd, RawFd};
+#[cfg(any(feature = "event", feature = "runtime"))]
+use super::io::errno::try_decode_error;
+#[cfg(target_pointer_width = "64")]
+use super::io::errno::try_decode_u64;
+#[cfg(not(debug_assertions))]
+use super::io::errno::{
+    decode_c_int_infallible, decode_c_uint_infallible, decode_usize_infallible,
+};
+use super::io::errno::{
+    try_decode_c_int, try_decode_c_uint, try_decode_raw_fd, try_decode_usize, try_decode_void,
+    try_decode_void_star,
+};
+use super::reg::{raw_arg, ArgNumber, ArgReg, RetReg, R0};
+#[cfg(feature = "time")]
+use super::time::types::TimerfdClockId;
+#[cfg(any(feature = "thread", feature = "time", target_arch = "x86"))]
+use crate::clockid::ClockId;
+use crate::fd::OwnedFd;
+use crate::ffi::CStr;
+use crate::io;
+#[cfg(any(feature = "process", feature = "runtime", feature = "termios"))]
+use crate::pid::Pid;
+#[cfg(feature = "process")]
+use crate::process::Resource;
+#[cfg(any(feature = "process", feature = "runtime"))]
+use crate::signal::Signal;
+use crate::utils::{as_mut_ptr, as_ptr};
+use core::mem::MaybeUninit;
+use core::ptr::null_mut;
+#[cfg(any(feature = "thread", feature = "time", target_arch = "x86"))]
+use linux_raw_sys::general::__kernel_clockid_t;
+#[cfg(target_pointer_width = "64")]
+use linux_raw_sys::general::__kernel_loff_t;
+#[cfg(feature = "net")]
+use linux_raw_sys::net::socklen_t;
+
+/// Convert `SYS_*` constants for socketcall.
+#[cfg(target_arch = "x86")]
+#[inline]
+pub(super) fn x86_sys<'a, Num: ArgNumber>(sys: u32) -> ArgReg<'a, Num> {
+    pass_usize(sys as usize)
+}
+
+/// Pass the "low" half of the endian-specific memory encoding of a `u64`, for
+/// 32-bit architectures.
+#[cfg(target_pointer_width = "32")]
+#[inline]
+pub(super) fn lo<'a, Num: ArgNumber>(x: u64) -> ArgReg<'a, Num> {
+    #[cfg(target_endian = "little")]
+    let x = x >> 32;
+    #[cfg(target_endian = "big")]
+    let x = x & 0xffff_ffff;
+
+    pass_usize(x as usize)
+}
+
+/// Pass the "high" half of the endian-specific memory encoding of a `u64`, for
+/// 32-bit architectures.
+#[cfg(target_pointer_width = "32")]
+#[inline]
+pub(super) fn hi<'a, Num: ArgNumber>(x: u64) -> ArgReg<'a, Num> {
+    #[cfg(target_endian = "little")]
+    let x = x & 0xffff_ffff;
+    #[cfg(target_endian = "big")]
+    let x = x >> 32;
+
+    pass_usize(x as usize)
+}
+
+/// Pass a zero, or null, argument.
+#[inline]
+pub(super) fn zero<'a, Num: ArgNumber>() -> ArgReg<'a, Num> {
+    raw_arg(null_mut())
+}
+
+/// Pass the `mem::size_of` of a type.
+#[inline]
+pub(super) fn size_of<'a, T: Sized, Num: ArgNumber>() -> ArgReg<'a, Num> {
+    pass_usize(core::mem::size_of::<T>())
+}
+
+/// Pass an arbitrary `usize` value.
+///
+/// For passing pointers, use `void_star` or other functions which take a raw
+/// pointer instead of casting to `usize`, so that provenance is preserved.
+#[inline]
+pub(super) fn pass_usize<'a, Num: ArgNumber>(t: usize) -> ArgReg<'a, Num> {
+    raw_arg(t as *mut _)
+}
+
+impl<'a, Num: ArgNumber, T> From<*mut T> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(c: *mut T) -> ArgReg<'a, Num> {
+        raw_arg(c.cast())
+    }
+}
+
+impl<'a, Num: ArgNumber, T> From<*const T> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(c: *const T) -> ArgReg<'a, Num> {
+        let mut_ptr = c as *mut T;
+        raw_arg(mut_ptr.cast())
+    }
+}
+
+impl<'a, Num: ArgNumber> From<&'a CStr> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(c: &'a CStr) -> Self {
+        let mut_ptr = c.as_ptr() as *mut u8;
+        raw_arg(mut_ptr.cast())
+    }
+}
+
+impl<'a, Num: ArgNumber> From<Option<&'a CStr>> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(t: Option<&'a CStr>) -> Self {
+        raw_arg(match t {
+            Some(s) => {
+                let mut_ptr = s.as_ptr() as *mut u8;
+                mut_ptr.cast()
+            }
+            None => null_mut(),
+        })
+    }
+}
+
+/// Pass a borrowed file-descriptor argument.
+impl<'a, Num: ArgNumber> From<BorrowedFd<'a>> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(fd: BorrowedFd<'a>) -> Self {
+        // SAFETY: `BorrowedFd` ensures that the file descriptor is valid, and
+        // the lifetime parameter on the resulting `ArgReg` ensures that the
+        // result is bounded by the `BorrowedFd`'s lifetime.
+        unsafe { raw_fd(fd.as_raw_fd()) }
+    }
+}
+
+/// Pass a raw file-descriptor argument. Most users should use [`ArgReg::from`]
+/// instead, to preserve I/O safety as long as possible.
+///
+/// # Safety
+///
+/// `fd` must be a valid open file descriptor.
+#[inline]
+pub(super) unsafe fn raw_fd<'a, Num: ArgNumber>(fd: RawFd) -> ArgReg<'a, Num> {
+    // Use `no_fd` when passing `-1` is intended.
+    #[cfg(feature = "fs")]
+    debug_assert!(fd == crate::fs::CWD.as_raw_fd() || fd >= 0);
+
+    // Don't pass the `io_uring_register_files_skip` sentry value this way.
+    #[cfg(feature = "io_uring")]
+    debug_assert_ne!(
+        fd,
+        crate::io_uring::io_uring_register_files_skip().as_raw_fd()
+    );
+
+    // Linux doesn't look at the high bits beyond the `c_int`, so use
+    // zero-extension rather than sign-extension because it's a smaller
+    // instruction.
+    let fd: c::c_int = fd;
+    pass_usize(fd as c::c_uint as usize)
+}
+
+/// Deliberately pass `-1` to a file-descriptor argument, for system calls
+/// like `mmap` where this indicates the argument is omitted.
+#[inline]
+pub(super) fn no_fd<'a, Num: ArgNumber>() -> ArgReg<'a, Num> {
+    pass_usize(!0_usize)
+}
+
+#[inline]
+pub(super) fn slice_just_addr<T: Sized, Num: ArgNumber>(v: &[T]) -> ArgReg<'_, Num> {
+    let mut_ptr = v.as_ptr() as *mut T;
+    raw_arg(mut_ptr.cast())
+}
+
+#[inline]
+pub(super) fn slice_just_addr_mut<T: Sized, Num: ArgNumber>(v: &mut [T]) -> ArgReg<'_, Num> {
+    raw_arg(v.as_mut_ptr().cast())
+}
+
+#[inline]
+pub(super) fn slice<T: Sized, Num0: ArgNumber, Num1: ArgNumber>(
+    v: &[T],
+) -> (ArgReg<'_, Num0>, ArgReg<'_, Num1>) {
+    (slice_just_addr(v), pass_usize(v.len()))
+}
+
+#[inline]
+pub(super) fn slice_mut<T: Sized, Num0: ArgNumber, Num1: ArgNumber>(
+    v: &mut [T],
+) -> (ArgReg<'_, Num0>, ArgReg<'_, Num1>) {
+    (raw_arg(v.as_mut_ptr().cast()), pass_usize(v.len()))
+}
+
+#[inline]
+pub(super) fn by_ref<T: Sized, Num: ArgNumber>(t: &T) -> ArgReg<'_, Num> {
+    let mut_ptr = as_ptr(t) as *mut T;
+    raw_arg(mut_ptr.cast())
+}
+
+#[inline]
+pub(super) fn by_mut<T: Sized, Num: ArgNumber>(t: &mut T) -> ArgReg<'_, Num> {
+    raw_arg(as_mut_ptr(t).cast())
+}
+
+/// Convert an optional mutable reference into a `usize` for passing to a
+/// syscall.
+#[inline]
+pub(super) fn opt_mut<T: Sized, Num: ArgNumber>(t: Option<&mut T>) -> ArgReg<'_, Num> {
+    // This optimizes into the equivalent of `transmute(t)`, and has the
+    // advantage of not requiring `unsafe`.
+    match t {
+        Some(t) => by_mut(t),
+        None => raw_arg(null_mut()),
+    }
+}
+
+/// Convert an optional immutable reference into a `usize` for passing to a
+/// syscall.
+#[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))]
+#[inline]
+pub(super) fn opt_ref<T: Sized, Num: ArgNumber>(t: Option<&T>) -> ArgReg<'_, Num> {
+    // This optimizes into the equivalent of `transmute(t)`, and has the
+    // advantage of not requiring `unsafe`.
+    match t {
+        Some(t) => by_ref(t),
+        None => raw_arg(null_mut()),
+    }
+}
+
+/// Convert a `c_int` into an `ArgReg`.
+///
+/// Be sure to use `raw_fd` to pass `RawFd` values.
+#[inline]
+pub(super) fn c_int<'a, Num: ArgNumber>(i: c::c_int) -> ArgReg<'a, Num> {
+    pass_usize(i as usize)
+}
+
+/// Convert a `c_uint` into an `ArgReg`.
+#[inline]
+pub(super) fn c_uint<'a, Num: ArgNumber>(i: c::c_uint) -> ArgReg<'a, Num> {
+    pass_usize(i as usize)
+}
+
+#[cfg(target_pointer_width = "64")]
+#[inline]
+pub(super) fn loff_t<'a, Num: ArgNumber>(i: __kernel_loff_t) -> ArgReg<'a, Num> {
+    pass_usize(i as usize)
+}
+
+#[cfg(target_pointer_width = "64")]
+#[inline]
+pub(super) fn loff_t_from_u64<'a, Num: ArgNumber>(i: u64) -> ArgReg<'a, Num> {
+    // `loff_t` is signed, but syscalls which expect `loff_t` return `EINVAL`
+    // if it's outside the signed `i64` range, so we can silently cast.
+    pass_usize(i as usize)
+}
+
+#[cfg(any(feature = "thread", feature = "time", target_arch = "x86"))]
+impl<'a, Num: ArgNumber> From<ClockId> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(i: ClockId) -> Self {
+        pass_usize(i as __kernel_clockid_t as usize)
+    }
+}
+
+#[cfg(feature = "time")]
+impl<'a, Num: ArgNumber> From<TimerfdClockId> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(i: TimerfdClockId) -> Self {
+        pass_usize(i as __kernel_clockid_t as usize)
+    }
+}
+
+#[cfg(feature = "net")]
+#[inline]
+pub(super) fn socklen_t<'a, Num: ArgNumber>(i: socklen_t) -> ArgReg<'a, Num> {
+    pass_usize(i as usize)
+}
+
+#[cfg(any(
+    feature = "fs",
+    all(
+        not(feature = "use-libc-auxv"),
+        not(feature = "use-explicitly-provided-auxv"),
+        any(
+            feature = "param",
+            feature = "process",
+            feature = "runtime",
+            feature = "time",
+            target_arch = "x86",
+        )
+    )
+))]
+pub(crate) mod fs {
+    use super::*;
+    use crate::fs::{FileType, Mode, OFlags};
+    #[cfg(target_pointer_width = "32")]
+    use linux_raw_sys::general::O_LARGEFILE;
+
+    impl<'a, Num: ArgNumber> From<Mode> for ArgReg<'a, Num> {
+        #[inline]
+        fn from(mode: Mode) -> Self {
+            pass_usize(mode.bits() as usize)
+        }
+    }
+
+    impl<'a, Num: ArgNumber> From<(Mode, FileType)> for ArgReg<'a, Num> {
+        #[inline]
+        fn from(pair: (Mode, FileType)) -> Self {
+            pass_usize(pair.0.as_raw_mode() as usize | pair.1.as_raw_mode() as usize)
+        }
+    }
+
+    impl<'a, Num: ArgNumber> From<crate::fs::AtFlags> for ArgReg<'a, Num> {
+        #[inline]
+        fn from(flags: crate::fs::AtFlags) -> Self {
+            c_uint(flags.bits())
+        }
+    }
+
+    impl<'a, Num: ArgNumber> From<crate::fs::XattrFlags> for ArgReg<'a, Num> {
+        #[inline]
+        fn from(flags: crate::fs::XattrFlags) -> Self {
+            c_uint(flags.bits())
+        }
+    }
+
+    impl<'a, Num: ArgNumber> From<crate::fs::inotify::CreateFlags> for ArgReg<'a, Num> {
+        #[inline]
+        fn from(flags: crate::fs::inotify::CreateFlags) -> Self {
+            c_uint(flags.bits())
+        }
+    }
+
+    impl<'a, Num: ArgNumber> From<crate::fs::inotify::WatchFlags> for ArgReg<'a, Num> {
+        #[inline]
+        fn from(flags: crate::fs::inotify::WatchFlags) -> Self {
+            c_uint(flags.bits())
+        }
+    }
+
+    impl<'a, Num: ArgNumber> From<crate::fs::MemfdFlags> for ArgReg<'a, Num> {
+        #[inline]
+        fn from(flags: crate::fs::MemfdFlags) -> Self {
+            c_uint(flags.bits())
+        }
+    }
+
+    impl<'a, Num: ArgNumber> From<crate::fs::RenameFlags> for ArgReg<'a, Num> {
+        #[inline]
+        fn from(flags: crate::fs::RenameFlags) -> Self {
+            c_uint(flags.bits())
+        }
+    }
+
+    impl<'a, Num: ArgNumber> From<crate::fs::StatxFlags> for ArgReg<'a, Num> {
+        #[inline]
+        fn from(flags: crate::fs::StatxFlags) -> Self {
+            c_uint(flags.bits())
+        }
+    }
+
+    #[cfg(target_pointer_width = "32")]
+    #[inline]
+    fn oflags_bits(oflags: OFlags) -> c::c_uint {
+        let mut bits = oflags.bits();
+        // Add `O_LARGEFILE`, unless `O_PATH` is set, as Linux returns `EINVAL`
+        // when both are set.
+        if !oflags.contains(OFlags::PATH) {
+            bits |= O_LARGEFILE;
+        }
+        bits
+    }
+
+    #[cfg(target_pointer_width = "64")]
+    #[inline]
+    const fn oflags_bits(oflags: OFlags) -> c::c_uint {
+        oflags.bits()
+    }
+
+    impl<'a, Num: ArgNumber> From<OFlags> for ArgReg<'a, Num> {
+        #[inline]
+        fn from(oflags: OFlags) -> Self {
+            pass_usize(oflags_bits(oflags) as usize)
+        }
+    }
+
+    /// Convert an `OFlags` into a `u64` for use in the `open_how` struct.
+    #[inline]
+    pub(crate) fn oflags_for_open_how(oflags: OFlags) -> u64 {
+        u64::from(oflags_bits(oflags))
+    }
+
+    impl<'a, Num: ArgNumber> From<crate::fs::FallocateFlags> for ArgReg<'a, Num> {
+        #[inline]
+        fn from(flags: crate::fs::FallocateFlags) -> Self {
+            c_uint(flags.bits())
+        }
+    }
+
+    impl<'a, Num: ArgNumber> From<crate::fs::Advice> for ArgReg<'a, Num> {
+        #[inline]
+        fn from(advice: crate::fs::Advice) -> Self {
+            c_uint(advice as c::c_uint)
+        }
+    }
+
+    impl<'a, Num: ArgNumber> From<crate::fs::SealFlags> for ArgReg<'a, Num> {
+        #[inline]
+        fn from(flags: crate::fs::SealFlags) -> Self {
+            c_uint(flags.bits())
+        }
+    }
+
+    impl<'a, Num: ArgNumber> From<crate::fs::Access> for ArgReg<'a, Num> {
+        #[inline]
+        fn from(access: crate::fs::Access) -> Self {
+            c_uint(access.bits())
+        }
+    }
+}
+
+#[cfg(any(feature = "fs", feature = "mount"))]
+impl<'a, Num: ArgNumber> From<crate::backend::mount::types::MountFlagsArg> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mount::types::MountFlagsArg) -> Self {
+        c_uint(flags.0)
+    }
+}
+
+// When the deprecated "fs" aliases are removed, we can remove the "fs"
+// here too.
+#[cfg(any(feature = "fs", feature = "mount"))]
+impl<'a, Num: ArgNumber> From<crate::backend::mount::types::UnmountFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mount::types::UnmountFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "mount")]
+impl<'a, Num: ArgNumber> From<crate::mount::FsConfigCmd> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(cmd: crate::mount::FsConfigCmd) -> Self {
+        c_uint(cmd as c::c_uint)
+    }
+}
+
+#[cfg(feature = "mount")]
+impl<'a, Num: ArgNumber> From<crate::backend::mount::types::FsOpenFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mount::types::FsOpenFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "mount")]
+impl<'a, Num: ArgNumber> From<crate::backend::mount::types::FsMountFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mount::types::FsMountFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "mount")]
+impl<'a, Num: ArgNumber> From<crate::backend::mount::types::MountAttrFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mount::types::MountAttrFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "mount")]
+impl<'a, Num: ArgNumber> From<crate::backend::mount::types::OpenTreeFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mount::types::OpenTreeFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "mount")]
+impl<'a, Num: ArgNumber> From<crate::backend::mount::types::FsPickFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mount::types::FsPickFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "mount")]
+impl<'a, Num: ArgNumber> From<crate::backend::mount::types::MoveMountFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mount::types::MoveMountFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+impl<'a, Num: ArgNumber> From<crate::io::FdFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::io::FdFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "pipe")]
+impl<'a, Num: ArgNumber> From<crate::pipe::PipeFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::pipe::PipeFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "pipe")]
+impl<'a, Num: ArgNumber> From<crate::pipe::SpliceFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::pipe::SpliceFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+impl<'a, Num: ArgNumber> From<crate::io::DupFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::io::DupFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+impl<'a, Num: ArgNumber> From<crate::io::ReadWriteFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::io::ReadWriteFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "process")]
+impl<'a, Num: ArgNumber> From<crate::process::PidfdFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::process::PidfdFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "pty")]
+impl<'a, Num: ArgNumber> From<crate::pty::OpenptFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::pty::OpenptFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "thread")]
+impl<'a, Num: ArgNumber> From<crate::thread::UnshareFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::thread::UnshareFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "event")]
+impl<'a, Num: ArgNumber> From<crate::event::EventfdFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::event::EventfdFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "event")]
+impl<'a, Num: ArgNumber> From<crate::event::epoll::CreateFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::event::epoll::CreateFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "mm")]
+impl<'a, Num: ArgNumber> From<crate::backend::mm::types::ProtFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mm::types::ProtFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "mm")]
+impl<'a, Num: ArgNumber> From<crate::backend::mm::types::MsyncFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mm::types::MsyncFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "mm")]
+impl<'a, Num: ArgNumber> From<crate::backend::mm::types::MremapFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mm::types::MremapFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "mm")]
+impl<'a, Num: ArgNumber> From<crate::backend::mm::types::MlockFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mm::types::MlockFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "mm")]
+impl<'a, Num: ArgNumber> From<crate::backend::mm::types::MlockAllFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mm::types::MlockAllFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "mm")]
+impl<'a, Num: ArgNumber> From<crate::backend::mm::types::MapFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mm::types::MapFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "mm")]
+impl<'a, Num: ArgNumber> From<crate::backend::mm::types::MprotectFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mm::types::MprotectFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "mm")]
+impl<'a, Num: ArgNumber> From<crate::backend::mm::types::UserfaultfdFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::backend::mm::types::UserfaultfdFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "process")]
+impl<'a, Num: ArgNumber> From<crate::backend::process::types::MembarrierCommand>
+    for ArgReg<'a, Num>
+{
+    #[inline]
+    fn from(cmd: crate::backend::process::types::MembarrierCommand) -> Self {
+        c_uint(cmd as u32)
+    }
+}
+
+#[cfg(feature = "process")]
+impl<'a, Num: ArgNumber> From<crate::process::Cpuid> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(cpuid: crate::process::Cpuid) -> Self {
+        c_uint(cpuid.as_raw())
+    }
+}
+
+#[cfg(target_pointer_width = "64")]
+#[inline]
+pub(super) fn dev_t<'a, Num: ArgNumber>(dev: u64) -> ArgReg<'a, Num> {
+    pass_usize(dev as usize)
+}
+
+#[cfg(target_pointer_width = "32")]
+#[inline]
+pub(super) fn dev_t<'a, Num: ArgNumber>(dev: u64) -> io::Result<ArgReg<'a, Num>> {
+    Ok(pass_usize(dev.try_into().map_err(|_err| io::Errno::INVAL)?))
+}
+
+/// Convert a `Resource` into a syscall argument.
+#[cfg(feature = "process")]
+impl<'a, Num: ArgNumber> From<Resource> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(resource: Resource) -> Self {
+        c_uint(resource as c::c_uint)
+    }
+}
+
+#[cfg(any(feature = "process", feature = "runtime", feature = "termios"))]
+impl<'a, Num: ArgNumber> From<Pid> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(pid: Pid) -> Self {
+        pass_usize(pid.as_raw_nonzero().get() as usize)
+    }
+}
+
+#[cfg(feature = "process")]
+#[inline]
+pub(super) fn negative_pid<'a, Num: ArgNumber>(pid: Pid) -> ArgReg<'a, Num> {
+    pass_usize(pid.as_raw_nonzero().get().wrapping_neg() as usize)
+}
+
+#[cfg(any(feature = "process", feature = "runtime"))]
+impl<'a, Num: ArgNumber> From<Signal> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(sig: Signal) -> Self {
+        pass_usize(sig as usize)
+    }
+}
+
+#[cfg(feature = "io_uring")]
+impl<'a, Num: ArgNumber> From<crate::io_uring::IoringEnterFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::io_uring::IoringEnterFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "time")]
+impl<'a, Num: ArgNumber> From<crate::time::TimerfdFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::time::TimerfdFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "time")]
+impl<'a, Num: ArgNumber> From<crate::time::TimerfdTimerFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::time::TimerfdTimerFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "rand")]
+impl<'a, Num: ArgNumber> From<crate::rand::GetRandomFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::rand::GetRandomFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "net")]
+impl<'a, Num: ArgNumber> From<crate::net::RecvFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::net::RecvFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "net")]
+impl<'a, Num: ArgNumber> From<crate::net::SendFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::net::SendFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "net")]
+impl<'a, Num: ArgNumber> From<crate::net::SocketFlags> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::net::SocketFlags) -> Self {
+        c_uint(flags.bits())
+    }
+}
+
+#[cfg(feature = "net")]
+impl<'a, Num: ArgNumber> From<crate::net::AddressFamily> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(family: crate::net::AddressFamily) -> Self {
+        c_uint(family.0.into())
+    }
+}
+
+#[cfg(feature = "net")]
+impl<'a, Num: ArgNumber> From<(crate::net::SocketType, crate::net::SocketFlags)>
+    for ArgReg<'a, Num>
+{
+    #[inline]
+    fn from(pair: (crate::net::SocketType, crate::net::SocketFlags)) -> Self {
+        c_uint(pair.0 .0 | pair.1.bits())
+    }
+}
+
+#[cfg(feature = "thread")]
+impl<'a, Num: ArgNumber> From<(crate::thread::FutexOperation, crate::thread::FutexFlags)>
+    for ArgReg<'a, Num>
+{
+    #[inline]
+    fn from(pair: (crate::thread::FutexOperation, crate::thread::FutexFlags)) -> Self {
+        c_uint(pair.0 as u32 | pair.1.bits())
+    }
+}
+
+#[cfg(feature = "net")]
+impl<'a, Num: ArgNumber> From<crate::net::SocketType> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(type_: crate::net::SocketType) -> Self {
+        c_uint(type_.0)
+    }
+}
+
+#[cfg(feature = "net")]
+impl<'a, Num: ArgNumber> From<Option<crate::net::Protocol>> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(protocol: Option<crate::net::Protocol>) -> Self {
+        c_uint(match protocol {
+            Some(p) => p.0.get(),
+            None => 0,
+        })
+    }
+}
+
+impl<'a, Num: ArgNumber, T> From<&'a mut MaybeUninit<T>> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(t: &'a mut MaybeUninit<T>) -> Self {
+        raw_arg(t.as_mut_ptr().cast())
+    }
+}
+
+impl<'a, Num: ArgNumber, T> From<&'a mut [MaybeUninit<T>]> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(t: &'a mut [MaybeUninit<T>]) -> Self {
+        raw_arg(t.as_mut_ptr().cast())
+    }
+}
+
+#[cfg(any(feature = "process", feature = "thread"))]
+impl<'a, Num: ArgNumber> From<crate::ugid::Uid> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(t: crate::ugid::Uid) -> Self {
+        c_uint(t.as_raw())
+    }
+}
+
+#[cfg(any(feature = "process", feature = "thread"))]
+impl<'a, Num: ArgNumber> From<crate::ugid::Gid> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(t: crate::ugid::Gid) -> Self {
+        c_uint(t.as_raw())
+    }
+}
+
+#[cfg(feature = "runtime")]
+impl<'a, Num: ArgNumber> From<crate::runtime::How> for ArgReg<'a, Num> {
+    #[inline]
+    fn from(flags: crate::runtime::How) -> Self {
+        c_uint(flags as u32)
+    }
+}
+
+/// Convert a `usize` returned from a syscall that effectively returns `()` on
+/// success.
+///
+/// # Safety
+///
+/// The caller must ensure that this is the return value of a syscall which
+/// just returns 0 on success.
+#[inline]
+pub(super) unsafe fn ret(raw: RetReg<R0>) -> io::Result<()> {
+    try_decode_void(raw)
+}
+
+/// Convert a `usize` returned from a syscall that doesn't return on success.
+///
+/// # Safety
+///
+/// The caller must ensure that this is the return value of a syscall which
+/// doesn't return on success.
+#[cfg(any(feature = "event", feature = "runtime"))]
+#[inline]
+pub(super) unsafe fn ret_error(raw: RetReg<R0>) -> io::Errno {
+    try_decode_error(raw)
+}
+
+/// Convert a `usize` returned from a syscall that effectively always returns
+/// `()`.
+///
+/// # Safety
+///
+/// The caller must ensure that this is the return value of a syscall which
+/// always returns `()`.
+#[inline]
+pub(super) unsafe fn ret_infallible(raw: RetReg<R0>) {
+    #[cfg(debug_assertions)]
+    {
+        try_decode_void(raw).unwrap()
+    }
+    #[cfg(not(debug_assertions))]
+    drop(raw);
+}
+
+/// Convert a `usize` returned from a syscall that effectively returns a
+/// `c_int` on success.
+#[inline]
+pub(super) fn ret_c_int(raw: RetReg<R0>) -> io::Result<c::c_int> {
+    try_decode_c_int(raw)
+}
+
+/// Convert a `usize` returned from a syscall that effectively returns a
+/// `c_uint` on success.
+#[inline]
+pub(super) fn ret_c_uint(raw: RetReg<R0>) -> io::Result<c::c_uint> {
+    try_decode_c_uint(raw)
+}
+
+/// Convert a `usize` returned from a syscall that effectively returns a `u64`
+/// on success.
+#[cfg(target_pointer_width = "64")]
+#[inline]
+pub(super) fn ret_u64(raw: RetReg<R0>) -> io::Result<u64> {
+    try_decode_u64(raw)
+}
+
+/// Convert a `usize` returned from a syscall that effectively returns a
+/// `usize` on success.
+#[inline]
+pub(super) fn ret_usize(raw: RetReg<R0>) -> io::Result<usize> {
+    try_decode_usize(raw)
+}
+
+/// Convert a `usize` returned from a syscall that effectively always
+/// returns a `usize`.
+///
+/// # Safety
+///
+/// This function must only be used with return values from infallible
+/// syscalls.
+#[inline]
+pub(super) unsafe fn ret_usize_infallible(raw: RetReg<R0>) -> usize {
+    #[cfg(debug_assertions)]
+    {
+        try_decode_usize(raw).unwrap()
+    }
+    #[cfg(not(debug_assertions))]
+    {
+        decode_usize_infallible(raw)
+    }
+}
+
+/// Convert a `c_int` returned from a syscall that effectively always
+/// returns a `c_int`.
+///
+/// # Safety
+///
+/// This function must only be used with return values from infallible
+/// syscalls.
+#[inline]
+pub(super) unsafe fn ret_c_int_infallible(raw: RetReg<R0>) -> c::c_int {
+    #[cfg(debug_assertions)]
+    {
+        try_decode_c_int(raw).unwrap()
+    }
+    #[cfg(not(debug_assertions))]
+    {
+        decode_c_int_infallible(raw)
+    }
+}
+
+/// Convert a `c_uint` returned from a syscall that effectively always
+/// returns a `c_uint`.
+///
+/// # Safety
+///
+/// This function must only be used with return values from infallible
+/// syscalls.
+#[inline]
+pub(super) unsafe fn ret_c_uint_infallible(raw: RetReg<R0>) -> c::c_uint {
+    #[cfg(debug_assertions)]
+    {
+        try_decode_c_uint(raw).unwrap()
+    }
+    #[cfg(not(debug_assertions))]
+    {
+        decode_c_uint_infallible(raw)
+    }
+}
+
+/// Convert a `usize` returned from a syscall that effectively returns an
+/// `OwnedFd` on success.
+///
+/// # Safety
+///
+/// The caller must ensure that this is the return value of a syscall which
+/// returns an owned file descriptor.
+#[inline]
+pub(super) unsafe fn ret_owned_fd(raw: RetReg<R0>) -> io::Result<OwnedFd> {
+    let raw_fd = try_decode_raw_fd(raw)?;
+    Ok(crate::backend::fd::OwnedFd::from_raw_fd(raw_fd))
+}
+
+/// Convert the return value of `dup2` and `dup3`.
+///
+/// When these functions succeed, they return the same value as their second
+/// argument, so we don't construct a new `OwnedFd`.
+///
+/// # Safety
+///
+/// The caller must ensure that this is the return value of a syscall which
+/// returns a file descriptor.
+#[inline]
+pub(super) unsafe fn ret_discarded_fd(raw: RetReg<R0>) -> io::Result<()> {
+    let _raw_fd = try_decode_raw_fd(raw)?;
+    Ok(())
+}
+
+/// Convert a `usize` returned from a syscall that effectively returns a
+/// `*mut c_void` on success.
+#[inline]
+pub(super) fn ret_void_star(raw: RetReg<R0>) -> io::Result<*mut c::c_void> {
+    try_decode_void_star(raw)
+}
diff --git a/vendor/rustix/src/backend/linux_raw/event/epoll.rs b/vendor/rustix/src/backend/linux_raw/event/epoll.rs
new file mode 100644
index 0000000..3d5787b
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/event/epoll.rs
@@ -0,0 +1,470 @@
+//! Linux `epoll` support.
+//!
+//! # Examples
+//!
+//! ```no_run
+//! # #[cfg(feature = "net")]
+//! # fn main() -> std::io::Result<()> {
+//! use rustix::event::epoll;
+//! use rustix::fd::AsFd;
+//! use rustix::io::{ioctl_fionbio, read, write};
+//! use rustix::net::{
+//!     accept, bind_v4, listen, socket, AddressFamily, Ipv4Addr, SocketAddrV4, SocketType,
+//! };
+//! use std::collections::HashMap;
+//! use std::os::unix::io::AsRawFd;
+//!
+//! // Create a socket and listen on it.
+//! let listen_sock = socket(AddressFamily::INET, SocketType::STREAM, None)?;
+//! bind_v4(&listen_sock, &SocketAddrV4::new(Ipv4Addr::LOCALHOST, 0))?;
+//! listen(&listen_sock, 1)?;
+//!
+//! // Create an epoll object. Using `Owning` here means the epoll object will
+//! // take ownership of the file descriptors registered with it.
+//! let epoll = epoll::create(epoll::CreateFlags::CLOEXEC)?;
+//!
+//! // Register the socket with the epoll object.
+//! epoll::add(
+//!     &epoll,
+//!     &listen_sock,
+//!     epoll::EventData::new_u64(1),
+//!     epoll::EventFlags::IN,
+//! )?;
+//!
+//! // Keep track of the sockets we've opened.
+//! let mut next_id = epoll::EventData::new_u64(2);
+//! let mut sockets = HashMap::new();
+//!
+//! // Process events.
+//! let mut event_list = epoll::EventVec::with_capacity(4);
+//! loop {
+//!     epoll::wait(&epoll, &mut event_list, -1)?;
+//!     for event in &event_list {
+//!         let target = event.data;
+//!         if target.u64() == 1 {
+//!             // Accept a new connection, set it to non-blocking, and
+//!             // register to be notified when it's ready to write to.
+//!             let conn_sock = accept(&listen_sock)?;
+//!             ioctl_fionbio(&conn_sock, true)?;
+//!             epoll::add(
+//!                 &epoll,
+//!                 &conn_sock,
+//!                 next_id,
+//!                 epoll::EventFlags::OUT | epoll::EventFlags::ET,
+//!             )?;
+//!
+//!             // Keep track of the socket.
+//!             sockets.insert(next_id, conn_sock);
+//!             next_id = epoll::EventData::new_u64(next_id.u64() + 1);
+//!         } else {
+//!             // Write a message to the stream and then unregister it.
+//!             let target = sockets.remove(&target).unwrap();
+//!             write(&target, b"hello\n")?;
+//!             let _ = epoll::delete(&epoll, &target)?;
+//!         }
+//!     }
+//! }
+//! # }
+//! # #[cfg(not(feature = "net"))]
+//! # fn main() {}
+//! ```
+
+#![allow(unsafe_code)]
+
+use crate::backend::c;
+use crate::backend::event::syscalls;
+use crate::fd::{AsFd, AsRawFd, OwnedFd};
+use crate::io;
+#[cfg(feature = "alloc")]
+use alloc::vec::Vec;
+use bitflags::bitflags;
+use core::ffi::c_void;
+use core::hash::{Hash, Hasher};
+use core::slice;
+
+bitflags! {
+    /// `EPOLL_*` for use with [`new`].
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct CreateFlags: c::c_uint {
+        /// `EPOLL_CLOEXEC`
+        const CLOEXEC = linux_raw_sys::general::EPOLL_CLOEXEC;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `EPOLL*` for use with [`add`].
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct EventFlags: u32 {
+        /// `EPOLLIN`
+        const IN = linux_raw_sys::general::EPOLLIN as u32;
+
+        /// `EPOLLOUT`
+        const OUT = linux_raw_sys::general::EPOLLOUT as u32;
+
+        /// `EPOLLPRI`
+        const PRI = linux_raw_sys::general::EPOLLPRI as u32;
+
+        /// `EPOLLERR`
+        const ERR = linux_raw_sys::general::EPOLLERR as u32;
+
+        /// `EPOLLHUP`
+        const HUP = linux_raw_sys::general::EPOLLHUP as u32;
+
+        /// `EPOLLRDNORM`
+        const RDNORM = linux_raw_sys::general::EPOLLRDNORM as u32;
+
+        /// `EPOLLRDBAND`
+        const RDBAND = linux_raw_sys::general::EPOLLRDBAND as u32;
+
+        /// `EPOLLWRNORM`
+        const WRNORM = linux_raw_sys::general::EPOLLWRNORM as u32;
+
+        /// `EPOLLWRBAND`
+        const WRBAND = linux_raw_sys::general::EPOLLWRBAND as u32;
+
+        /// `EPOLLMSG`
+        const MSG = linux_raw_sys::general::EPOLLMSG as u32;
+
+        /// `EPOLLRDHUP`
+        const RDHUP = linux_raw_sys::general::EPOLLRDHUP as u32;
+
+        /// `EPOLLET`
+        const ET = linux_raw_sys::general::EPOLLET as u32;
+
+        /// `EPOLLONESHOT`
+        const ONESHOT = linux_raw_sys::general::EPOLLONESHOT as u32;
+
+        /// `EPOLLWAKEUP`
+        const WAKEUP = linux_raw_sys::general::EPOLLWAKEUP as u32;
+
+        /// `EPOLLEXCLUSIVE`
+        const EXCLUSIVE = linux_raw_sys::general::EPOLLEXCLUSIVE as u32;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `epoll_create1(flags)`—Creates a new epoll object.
+///
+/// Use the [`CreateFlags::CLOEXEC`] flag to prevent the resulting file
+/// descriptor from being implicitly passed across `exec` boundaries.
+#[inline]
+#[doc(alias = "epoll_create1")]
+pub fn create(flags: CreateFlags) -> io::Result<OwnedFd> {
+    syscalls::epoll_create(flags)
+}
+
+/// `epoll_ctl(self, EPOLL_CTL_ADD, data, event)`—Adds an element to an epoll
+/// object.
+///
+/// This registers interest in any of the events set in `events` occurring on
+/// the file descriptor associated with `data`.
+///
+/// If [`delete`] is not called on the I/O source passed into this function
+/// before the I/O source is `close`d, then the `epoll` will act as if the I/O
+/// source is still registered with it. This can lead to spurious events being
+/// returned from [`wait`]. If a file descriptor is an
+/// `Arc<dyn SystemResource>`, then `epoll` can be thought to maintain a
+/// `Weak<dyn SystemResource>` to the file descriptor.
+#[doc(alias = "epoll_ctl")]
+#[inline]
+pub fn add(
+    epoll: impl AsFd,
+    source: impl AsFd,
+    data: EventData,
+    event_flags: EventFlags,
+) -> io::Result<()> {
+    // SAFETY: We're calling `epoll_ctl` via FFI and we know how it
+    // behaves.
+    unsafe {
+        syscalls::epoll_add(
+            epoll.as_fd(),
+            source.as_fd().as_raw_fd(),
+            &Event {
+                flags: event_flags,
+                data,
+            },
+        )
+    }
+}
+
+/// `epoll_ctl(self, EPOLL_CTL_MOD, target, event)`—Modifies an element in a
+/// given epoll object.
+///
+/// This sets the events of interest with `target` to `events`.
+#[doc(alias = "epoll_ctl")]
+#[inline]
+pub fn modify(
+    epoll: impl AsFd,
+    source: impl AsFd,
+    data: EventData,
+    event_flags: EventFlags,
+) -> io::Result<()> {
+    // SAFETY: We're calling `epoll_ctl` via FFI and we know how it
+    // behaves.
+    unsafe {
+        let raw_fd = source.as_fd().as_raw_fd();
+        syscalls::epoll_mod(
+            epoll.as_fd(),
+            raw_fd,
+            &Event {
+                flags: event_flags,
+                data,
+            },
+        )
+    }
+}
+
+/// `epoll_ctl(self, EPOLL_CTL_DEL, target, NULL)`—Removes an element in a
+/// given epoll object.
+#[doc(alias = "epoll_ctl")]
+#[inline]
+pub fn delete(epoll: impl AsFd, source: impl AsFd) -> io::Result<()> {
+    // SAFETY: We're calling `epoll_ctl` via FFI and we know how it
+    // behaves.
+    unsafe {
+        let raw_fd = source.as_fd().as_raw_fd();
+        syscalls::epoll_del(epoll.as_fd(), raw_fd)
+    }
+}
+
+/// `epoll_wait(self, events, timeout)`—Waits for registered events of
+/// interest.
+///
+/// For each event of interest, an element is written to `events`. On
+/// success, this returns the number of written elements.
+#[cfg(feature = "alloc")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
+#[inline]
+pub fn wait(epoll: impl AsFd, event_list: &mut EventVec, timeout: c::c_int) -> io::Result<()> {
+    // SAFETY: We're calling `epoll_wait` via FFI and we know how it
+    // behaves.
+    unsafe {
+        event_list.events.set_len(0);
+        let nfds = syscalls::epoll_wait(
+            epoll.as_fd(),
+            event_list.events[..].as_mut_ptr().cast(),
+            event_list.events.capacity(),
+            timeout,
+        )?;
+        event_list.events.set_len(nfds);
+    }
+
+    Ok(())
+}
+
+/// An iterator over the `Event`s in an `EventVec`.
+pub struct Iter<'a> {
+    /// Use `Copied` to copy the struct, since `Event` is `packed` on some
+    /// platforms, and it's common for users to directly destructure it, which
+    /// would lead to errors about forming references to packed fields.
+    iter: core::iter::Copied<slice::Iter<'a, Event>>,
+}
+
+impl<'a> Iterator for Iter<'a> {
+    type Item = Event;
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next()
+    }
+}
+
+/// A record of an event that occurred.
+#[repr(C)]
+#[cfg_attr(target_arch = "x86_64", repr(packed))]
+#[derive(Copy, Clone, Eq, PartialEq, Hash)]
+pub struct Event {
+    /// Which specific event(s) occurred.
+    pub flags: EventFlags,
+    /// User data.
+    pub data: EventData,
+}
+
+/// Data associated with an [`Event`]. This can either be a 64-bit integer
+/// value or a pointer which preserves pointer provenance.
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub union EventData {
+    /// A 64-bit integer value.
+    as_u64: u64,
+
+    /// A `*mut c_void` which preserves pointer provenance, extended to be
+    /// 64-bit so that if we read the value as a `u64` union field, we don't
+    /// get uninitialized memory.
+    sixty_four_bit_pointer: SixtyFourBitPointer,
+}
+
+impl EventData {
+    /// Construct a new value containing a `u64`.
+    #[inline]
+    pub const fn new_u64(value: u64) -> Self {
+        Self { as_u64: value }
+    }
+
+    /// Construct a new value containing a `*mut c_void`.
+    #[inline]
+    pub const fn new_ptr(value: *mut c_void) -> Self {
+        Self {
+            sixty_four_bit_pointer: SixtyFourBitPointer {
+                pointer: value,
+                #[cfg(target_pointer_width = "32")]
+                _padding: 0,
+            },
+        }
+    }
+
+    /// Return the value as a `u64`.
+    ///
+    /// If the stored value was a pointer, the pointer is zero-extended to a
+    /// `u64`.
+    #[inline]
+    pub fn u64(self) -> u64 {
+        unsafe { self.as_u64 }
+    }
+
+    /// Return the value as a `*mut c_void`.
+    ///
+    /// If the stored value was a `u64`, the least-significant bits of the
+    /// `u64` are returned as a pointer value.
+    #[inline]
+    pub fn ptr(self) -> *mut c_void {
+        unsafe { self.sixty_four_bit_pointer.pointer }
+    }
+}
+
+impl PartialEq for EventData {
+    #[inline]
+    fn eq(&self, other: &Self) -> bool {
+        self.u64() == other.u64()
+    }
+}
+
+impl Eq for EventData {}
+
+impl Hash for EventData {
+    #[inline]
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.u64().hash(state)
+    }
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+struct SixtyFourBitPointer {
+    #[cfg(target_endian = "big")]
+    #[cfg(target_pointer_width = "32")]
+    _padding: u32,
+
+    pointer: *mut c_void,
+
+    #[cfg(target_endian = "little")]
+    #[cfg(target_pointer_width = "32")]
+    _padding: u32,
+}
+
+/// A vector of `Event`s, plus context for interpreting them.
+#[cfg(feature = "alloc")]
+pub struct EventVec {
+    events: Vec<Event>,
+}
+
+#[cfg(feature = "alloc")]
+impl EventVec {
+    /// Constructs an `EventVec` from raw pointer, length, and capacity.
+    ///
+    /// # Safety
+    ///
+    /// This function calls [`Vec::from_raw_parts`] with its arguments.
+    ///
+    /// [`Vec::from_raw_parts`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.from_raw_parts
+    #[inline]
+    pub unsafe fn from_raw_parts(ptr: *mut Event, len: usize, capacity: usize) -> Self {
+        Self {
+            events: Vec::from_raw_parts(ptr, len, capacity),
+        }
+    }
+
+    /// Constructs an `EventVec` with memory for `capacity` `Event`s.
+    #[inline]
+    pub fn with_capacity(capacity: usize) -> Self {
+        Self {
+            events: Vec::with_capacity(capacity),
+        }
+    }
+
+    /// Returns the current `Event` capacity of this `EventVec`.
+    #[inline]
+    pub fn capacity(&self) -> usize {
+        self.events.capacity()
+    }
+
+    /// Reserves enough memory for at least `additional` more `Event`s.
+    #[inline]
+    pub fn reserve(&mut self, additional: usize) {
+        self.events.reserve(additional);
+    }
+
+    /// Reserves enough memory for exactly `additional` more `Event`s.
+    #[inline]
+    pub fn reserve_exact(&mut self, additional: usize) {
+        self.events.reserve_exact(additional);
+    }
+
+    /// Clears all the `Events` out of this `EventVec`.
+    #[inline]
+    pub fn clear(&mut self) {
+        self.events.clear();
+    }
+
+    /// Shrinks the capacity of this `EventVec` as much as possible.
+    #[inline]
+    pub fn shrink_to_fit(&mut self) {
+        self.events.shrink_to_fit();
+    }
+
+    /// Returns an iterator over the `Event`s in this `EventVec`.
+    #[inline]
+    pub fn iter(&self) -> Iter<'_> {
+        Iter {
+            iter: self.events.iter().copied(),
+        }
+    }
+
+    /// Returns the number of `Event`s logically contained in this `EventVec`.
+    #[inline]
+    pub fn len(&mut self) -> usize {
+        self.events.len()
+    }
+
+    /// Tests whether this `EventVec` is logically empty.
+    #[inline]
+    pub fn is_empty(&mut self) -> bool {
+        self.events.is_empty()
+    }
+}
+
+#[cfg(feature = "alloc")]
+impl<'a> IntoIterator for &'a EventVec {
+    type IntoIter = Iter<'a>;
+    type Item = Event;
+
+    #[inline]
+    fn into_iter(self) -> Self::IntoIter {
+        self.iter()
+    }
+}
+
+#[test]
+fn test_epoll_layouts() {
+    check_renamed_type!(Event, epoll_event);
+    check_renamed_type!(Event, epoll_event);
+    check_renamed_struct_renamed_field!(Event, epoll_event, flags, events);
+    check_renamed_struct_renamed_field!(Event, epoll_event, data, data);
+}
diff --git a/vendor/rustix/src/backend/linux_raw/event/mod.rs b/vendor/rustix/src/backend/linux_raw/event/mod.rs
new file mode 100644
index 0000000..605de25
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/event/mod.rs
@@ -0,0 +1,4 @@
+pub mod epoll;
+pub(crate) mod poll_fd;
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/linux_raw/event/poll_fd.rs b/vendor/rustix/src/backend/linux_raw/event/poll_fd.rs
new file mode 100644
index 0000000..9de43f2
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/event/poll_fd.rs
@@ -0,0 +1,98 @@
+use crate::fd::{AsFd, BorrowedFd};
+use bitflags::bitflags;
+
+bitflags! {
+    /// `POLL*` flags for use with [`poll`].
+    ///
+    /// [`poll`]: crate::event::poll
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct PollFlags: u16 {
+        /// `POLLIN`
+        const IN = linux_raw_sys::general::POLLIN as u16;
+        /// `POLLPRI`
+        const PRI = linux_raw_sys::general::POLLPRI as u16;
+        /// `POLLOUT`
+        const OUT = linux_raw_sys::general::POLLOUT as u16;
+        /// `POLLRDNORM`
+        const RDNORM = linux_raw_sys::general::POLLRDNORM as u16;
+        /// `POLLWRNORM`
+        const WRNORM = linux_raw_sys::general::POLLWRNORM as u16;
+        /// `POLLRDBAND`
+        const RDBAND = linux_raw_sys::general::POLLRDBAND as u16;
+        /// `POLLWRBAND`
+        const WRBAND = linux_raw_sys::general::POLLWRBAND as u16;
+        /// `POLLERR`
+        const ERR = linux_raw_sys::general::POLLERR as u16;
+        /// `POLLHUP`
+        const HUP = linux_raw_sys::general::POLLHUP as u16;
+        /// `POLLNVAL`
+        const NVAL = linux_raw_sys::general::POLLNVAL as u16;
+        /// `POLLRDHUP`
+        const RDHUP = linux_raw_sys::general::POLLRDHUP as u16;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `struct pollfd`—File descriptor and flags for use with [`poll`].
+///
+/// [`poll`]: crate::event::poll
+#[doc(alias = "pollfd")]
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct PollFd<'fd> {
+    pub(crate) fd: BorrowedFd<'fd>,
+    pub(crate) events: u16,
+    pub(crate) revents: u16,
+}
+
+impl<'fd> PollFd<'fd> {
+    /// Constructs a new `PollFd` holding `fd` and `events`.
+    #[inline]
+    pub fn new<Fd: AsFd>(fd: &'fd Fd, events: PollFlags) -> Self {
+        Self::from_borrowed_fd(fd.as_fd(), events)
+    }
+
+    /// Sets the contained file descriptor to `fd`.
+    #[inline]
+    pub fn set_fd<Fd: AsFd>(&mut self, fd: &'fd Fd) {
+        self.fd = fd.as_fd();
+    }
+
+    /// Clears the ready events.
+    #[inline]
+    pub fn clear_revents(&mut self) {
+        self.revents = 0;
+    }
+
+    /// Constructs a new `PollFd` holding `fd` and `events`.
+    ///
+    /// This is the same as `new`, but can be used to avoid borrowing the
+    /// `BorrowedFd`, which can be tricky in situations where the `BorrowedFd`
+    /// is a temporary.
+    #[inline]
+    pub fn from_borrowed_fd(fd: BorrowedFd<'fd>, events: PollFlags) -> Self {
+        Self {
+            fd,
+            events: events.bits(),
+            revents: 0,
+        }
+    }
+
+    /// Returns the ready events.
+    #[inline]
+    pub fn revents(&self) -> PollFlags {
+        // Use `.unwrap()` here because in theory we know we know all the bits
+        // the OS might set here, but OS's have added extensions in the past.
+        PollFlags::from_bits(self.revents).unwrap()
+    }
+}
+
+impl<'fd> AsFd for PollFd<'fd> {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        self.fd.as_fd()
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/event/syscalls.rs b/vendor/rustix/src/backend/linux_raw/event/syscalls.rs
new file mode 100644
index 0000000..0ae7753
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/event/syscalls.rs
@@ -0,0 +1,152 @@
+//! linux_raw syscalls supporting `rustix::event`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::c;
+#[cfg(feature = "alloc")]
+use crate::backend::conv::pass_usize;
+use crate::backend::conv::{
+    by_ref, c_int, c_uint, raw_fd, ret, ret_error, ret_owned_fd, ret_usize, slice_mut, zero,
+};
+use crate::event::{epoll, EventfdFlags, PollFd};
+use crate::fd::{BorrowedFd, OwnedFd};
+use crate::io;
+use linux_raw_sys::general::{EPOLL_CTL_ADD, EPOLL_CTL_DEL, EPOLL_CTL_MOD};
+#[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))]
+use {
+    crate::backend::conv::{opt_ref, size_of},
+    linux_raw_sys::general::{__kernel_timespec, kernel_sigset_t},
+};
+
+#[inline]
+pub(crate) fn poll(fds: &mut [PollFd<'_>], timeout: c::c_int) -> io::Result<usize> {
+    let (fds_addr_mut, fds_len) = slice_mut(fds);
+
+    #[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))]
+    unsafe {
+        let timeout = if timeout >= 0 {
+            Some(__kernel_timespec {
+                tv_sec: (timeout as i64) / 1000,
+                tv_nsec: (timeout as i64) % 1000 * 1_000_000,
+            })
+        } else {
+            None
+        };
+        ret_usize(syscall!(
+            __NR_ppoll,
+            fds_addr_mut,
+            fds_len,
+            opt_ref(timeout.as_ref()),
+            zero(),
+            size_of::<kernel_sigset_t, _>()
+        ))
+    }
+    #[cfg(not(any(target_arch = "aarch64", target_arch = "riscv64")))]
+    unsafe {
+        ret_usize(syscall!(__NR_poll, fds_addr_mut, fds_len, c_int(timeout)))
+    }
+}
+
+#[inline]
+pub(crate) fn epoll_create(flags: epoll::CreateFlags) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(syscall_readonly!(__NR_epoll_create1, flags)) }
+}
+
+#[inline]
+pub(crate) unsafe fn epoll_add(
+    epfd: BorrowedFd<'_>,
+    fd: c::c_int,
+    event: &epoll::Event,
+) -> io::Result<()> {
+    ret(syscall_readonly!(
+        __NR_epoll_ctl,
+        epfd,
+        c_uint(EPOLL_CTL_ADD),
+        raw_fd(fd),
+        by_ref(event)
+    ))
+}
+
+#[inline]
+pub(crate) unsafe fn epoll_mod(
+    epfd: BorrowedFd<'_>,
+    fd: c::c_int,
+    event: &epoll::Event,
+) -> io::Result<()> {
+    ret(syscall_readonly!(
+        __NR_epoll_ctl,
+        epfd,
+        c_uint(EPOLL_CTL_MOD),
+        raw_fd(fd),
+        by_ref(event)
+    ))
+}
+
+#[inline]
+pub(crate) unsafe fn epoll_del(epfd: BorrowedFd<'_>, fd: c::c_int) -> io::Result<()> {
+    ret(syscall_readonly!(
+        __NR_epoll_ctl,
+        epfd,
+        c_uint(EPOLL_CTL_DEL),
+        raw_fd(fd),
+        zero()
+    ))
+}
+
+#[cfg(feature = "alloc")]
+#[inline]
+pub(crate) fn epoll_wait(
+    epfd: BorrowedFd<'_>,
+    events: *mut epoll::Event,
+    num_events: usize,
+    timeout: c::c_int,
+) -> io::Result<usize> {
+    #[cfg(not(any(target_arch = "aarch64", target_arch = "riscv64")))]
+    unsafe {
+        ret_usize(syscall!(
+            __NR_epoll_wait,
+            epfd,
+            events,
+            pass_usize(num_events),
+            c_int(timeout)
+        ))
+    }
+    #[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))]
+    unsafe {
+        ret_usize(syscall!(
+            __NR_epoll_pwait,
+            epfd,
+            events,
+            pass_usize(num_events),
+            c_int(timeout),
+            zero()
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn eventfd(initval: u32, flags: EventfdFlags) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(syscall_readonly!(__NR_eventfd2, c_uint(initval), flags)) }
+}
+
+#[inline]
+pub(crate) fn pause() {
+    unsafe {
+        #[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))]
+        let error = ret_error(syscall_readonly!(
+            __NR_ppoll,
+            zero(),
+            zero(),
+            zero(),
+            zero()
+        ));
+
+        #[cfg(not(any(target_arch = "aarch64", target_arch = "riscv64")))]
+        let error = ret_error(syscall_readonly!(__NR_pause));
+
+        debug_assert_eq!(error, io::Errno::INTR);
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/event/types.rs b/vendor/rustix/src/backend/linux_raw/event/types.rs
new file mode 100644
index 0000000..01611f6
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/event/types.rs
@@ -0,0 +1,21 @@
+use crate::backend::c;
+use bitflags::bitflags;
+
+bitflags! {
+    /// `EFD_*` flags for use with [`eventfd`].
+    ///
+    /// [`eventfd`]: crate::event::eventfd
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct EventfdFlags: c::c_uint {
+        /// `EFD_CLOEXEC`
+        const CLOEXEC = linux_raw_sys::general::EFD_CLOEXEC;
+        /// `EFD_NONBLOCK`
+        const NONBLOCK = linux_raw_sys::general::EFD_NONBLOCK;
+        /// `EFD_SEMAPHORE`
+        const SEMAPHORE = linux_raw_sys::general::EFD_SEMAPHORE;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/fs/dir.rs b/vendor/rustix/src/backend/linux_raw/fs/dir.rs
new file mode 100644
index 0000000..dbddd58
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/fs/dir.rs
@@ -0,0 +1,315 @@
+use crate::fd::{AsFd, BorrowedFd, OwnedFd};
+use crate::ffi::{CStr, CString};
+use crate::fs::{
+    fcntl_getfl, fstat, fstatfs, fstatvfs, openat, FileType, Mode, OFlags, Stat, StatFs, StatVfs,
+};
+use crate::io;
+#[cfg(feature = "process")]
+use crate::process::fchdir;
+use crate::utils::as_ptr;
+use alloc::borrow::ToOwned;
+use alloc::vec::Vec;
+use core::fmt;
+use core::mem::size_of;
+use linux_raw_sys::general::{linux_dirent64, SEEK_SET};
+
+/// `DIR*`
+pub struct Dir {
+    /// The `OwnedFd` that we read directory entries from.
+    fd: OwnedFd,
+
+    /// Have we seen any errors in this iteration?
+    any_errors: bool,
+
+    /// Should we rewind the stream on the next iteration?
+    rewind: bool,
+
+    /// The buffer for `linux_dirent64` entries.
+    buf: Vec<u8>,
+
+    /// Where we are in the buffer.
+    pos: usize,
+}
+
+impl Dir {
+    /// Take ownership of `fd` and construct a `Dir` that reads entries from
+    /// the given directory file descriptor.
+    #[inline]
+    pub fn new<Fd: Into<OwnedFd>>(fd: Fd) -> io::Result<Self> {
+        Self::_new(fd.into())
+    }
+
+    #[inline]
+    fn _new(fd: OwnedFd) -> io::Result<Self> {
+        Ok(Self {
+            fd,
+            any_errors: false,
+            rewind: false,
+            buf: Vec::new(),
+            pos: 0,
+        })
+    }
+
+    /// Borrow `fd` and construct a `Dir` that reads entries from the given
+    /// directory file descriptor.
+    #[inline]
+    pub fn read_from<Fd: AsFd>(fd: Fd) -> io::Result<Self> {
+        Self::_read_from(fd.as_fd())
+    }
+
+    #[inline]
+    fn _read_from(fd: BorrowedFd<'_>) -> io::Result<Self> {
+        let flags = fcntl_getfl(fd)?;
+        let fd_for_dir = openat(fd, cstr!("."), flags | OFlags::CLOEXEC, Mode::empty())?;
+
+        Ok(Self {
+            fd: fd_for_dir,
+            any_errors: false,
+            rewind: false,
+            buf: Vec::new(),
+            pos: 0,
+        })
+    }
+
+    /// `rewinddir(self)`
+    #[inline]
+    pub fn rewind(&mut self) {
+        self.any_errors = false;
+        self.rewind = true;
+        self.pos = self.buf.len();
+    }
+
+    /// `readdir(self)`, where `None` means the end of the directory.
+    pub fn read(&mut self) -> Option<io::Result<DirEntry>> {
+        // If we've seen errors, don't continue to try to read anyting further.
+        if self.any_errors {
+            return None;
+        }
+
+        // If a rewind was requested, seek to the beginning.
+        if self.rewind {
+            self.rewind = false;
+            match io::retry_on_intr(|| {
+                crate::backend::fs::syscalls::_seek(self.fd.as_fd(), 0, SEEK_SET)
+            }) {
+                Ok(_) => (),
+                Err(err) => {
+                    self.any_errors = true;
+                    return Some(Err(err));
+                }
+            }
+        }
+
+        // Compute linux_dirent64 field offsets.
+        let z = linux_dirent64 {
+            d_ino: 0_u64,
+            d_off: 0_i64,
+            d_type: 0_u8,
+            d_reclen: 0_u16,
+            d_name: Default::default(),
+        };
+        let base = as_ptr(&z) as usize;
+        let offsetof_d_reclen = (as_ptr(&z.d_reclen) as usize) - base;
+        let offsetof_d_name = (as_ptr(&z.d_name) as usize) - base;
+        let offsetof_d_ino = (as_ptr(&z.d_ino) as usize) - base;
+        let offsetof_d_type = (as_ptr(&z.d_type) as usize) - base;
+
+        // Test if we need more entries, and if so, read more.
+        if self.buf.len() - self.pos < size_of::<linux_dirent64>() {
+            match self.read_more()? {
+                Ok(()) => (),
+                Err(err) => return Some(Err(err)),
+            }
+        }
+
+        // We successfully read an entry. Extract the fields.
+        let pos = self.pos;
+
+        // Do an unaligned u16 load.
+        let d_reclen = u16::from_ne_bytes([
+            self.buf[pos + offsetof_d_reclen],
+            self.buf[pos + offsetof_d_reclen + 1],
+        ]);
+        assert!(self.buf.len() - pos >= d_reclen as usize);
+        self.pos += d_reclen as usize;
+
+        // Read the NUL-terminated name from the `d_name` field. Without
+        // `unsafe`, we need to scan for the NUL twice: once to obtain a size
+        // for the slice, and then once within `CStr::from_bytes_with_nul`.
+        let name_start = pos + offsetof_d_name;
+        let name_len = self.buf[name_start..]
+            .iter()
+            .position(|x| *x == b'\0')
+            .unwrap();
+        let name = CStr::from_bytes_with_nul(&self.buf[name_start..][..=name_len]).unwrap();
+        let name = name.to_owned();
+        assert!(name.as_bytes().len() <= self.buf.len() - name_start);
+
+        // Do an unaligned u64 load.
+        let d_ino = u64::from_ne_bytes([
+            self.buf[pos + offsetof_d_ino],
+            self.buf[pos + offsetof_d_ino + 1],
+            self.buf[pos + offsetof_d_ino + 2],
+            self.buf[pos + offsetof_d_ino + 3],
+            self.buf[pos + offsetof_d_ino + 4],
+            self.buf[pos + offsetof_d_ino + 5],
+            self.buf[pos + offsetof_d_ino + 6],
+            self.buf[pos + offsetof_d_ino + 7],
+        ]);
+
+        let d_type = self.buf[pos + offsetof_d_type];
+
+        // Check that our types correspond to the `linux_dirent64` types.
+        let _ = linux_dirent64 {
+            d_ino,
+            d_off: 0,
+            d_type,
+            d_reclen,
+            d_name: Default::default(),
+        };
+
+        Some(Ok(DirEntry {
+            d_ino,
+            d_type,
+            name,
+        }))
+    }
+
+    #[must_use]
+    fn read_more(&mut self) -> Option<io::Result<()>> {
+        // The first few times we're called, we allocate a relatively small
+        // buffer, because many directories are small. If we're called more,
+        // use progressively larger allocations, up to a fixed maximum.
+        //
+        // The specific sizes and policy here have not been tuned in detail yet
+        // and may need to be adjusted. In doing so, we should be careful to
+        // avoid unbounded buffer growth. This buffer only exists to share the
+        // cost of a `getdents` call over many entries, so if it gets too big,
+        // cache and heap usage will outweigh the benefit. And ultimately,
+        // directories can contain more entries than we can allocate contiguous
+        // memory for, so we'll always need to cap the size at some point.
+        if self.buf.len() < 1024 * size_of::<linux_dirent64>() {
+            self.buf.reserve(32 * size_of::<linux_dirent64>());
+        }
+        self.buf.resize(self.buf.capacity(), 0);
+        let nread = match io::retry_on_intr(|| {
+            crate::backend::fs::syscalls::getdents(self.fd.as_fd(), &mut self.buf)
+        }) {
+            Ok(nread) => nread,
+            Err(io::Errno::NOENT) => {
+                self.any_errors = true;
+                return None;
+            }
+            Err(err) => {
+                self.any_errors = true;
+                return Some(Err(err));
+            }
+        };
+        self.buf.resize(nread, 0);
+        self.pos = 0;
+        if nread == 0 {
+            None
+        } else {
+            Some(Ok(()))
+        }
+    }
+
+    /// `fstat(self)`
+    #[inline]
+    pub fn stat(&self) -> io::Result<Stat> {
+        fstat(&self.fd)
+    }
+
+    /// `fstatfs(self)`
+    #[inline]
+    pub fn statfs(&self) -> io::Result<StatFs> {
+        fstatfs(&self.fd)
+    }
+
+    /// `fstatvfs(self)`
+    #[inline]
+    pub fn statvfs(&self) -> io::Result<StatVfs> {
+        fstatvfs(&self.fd)
+    }
+
+    /// `fchdir(self)`
+    #[cfg(feature = "process")]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "process")))]
+    #[inline]
+    pub fn chdir(&self) -> io::Result<()> {
+        fchdir(&self.fd)
+    }
+}
+
+impl Iterator for Dir {
+    type Item = io::Result<DirEntry>;
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        Self::read(self)
+    }
+}
+
+impl fmt::Debug for Dir {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Dir").field("fd", &self.fd).finish()
+    }
+}
+
+/// `struct dirent`
+#[derive(Debug)]
+pub struct DirEntry {
+    d_ino: u64,
+    d_type: u8,
+    name: CString,
+}
+
+impl DirEntry {
+    /// Returns the file name of this directory entry.
+    #[inline]
+    pub fn file_name(&self) -> &CStr {
+        &self.name
+    }
+
+    /// Returns the type of this directory entry.
+    #[inline]
+    pub fn file_type(&self) -> FileType {
+        FileType::from_dirent_d_type(self.d_type)
+    }
+
+    /// Return the inode number of this directory entry.
+    #[inline]
+    pub fn ino(&self) -> u64 {
+        self.d_ino
+    }
+}
+
+#[test]
+fn dir_iterator_handles_io_errors() {
+    // create a dir, keep the FD, then delete the dir
+    let tmp = tempfile::tempdir().unwrap();
+    let fd = crate::fs::openat(
+        crate::fs::CWD,
+        tmp.path(),
+        crate::fs::OFlags::RDONLY | crate::fs::OFlags::CLOEXEC,
+        crate::fs::Mode::empty(),
+    )
+    .unwrap();
+
+    let file_fd = crate::fs::openat(
+        &fd,
+        tmp.path().join("test.txt"),
+        crate::fs::OFlags::WRONLY | crate::fs::OFlags::CREATE,
+        crate::fs::Mode::RWXU,
+    )
+    .unwrap();
+
+    let mut dir = Dir::read_from(&fd).unwrap();
+
+    // Reach inside the `Dir` and replace its directory with a file, which
+    // will cause the subsequent `getdents64` to fail.
+    crate::io::dup2(&file_fd, &mut dir.fd).unwrap();
+
+    assert!(matches!(dir.next(), Some(Err(_))));
+    assert!(dir.next().is_none());
+}
diff --git a/vendor/rustix/src/backend/linux_raw/fs/inotify.rs b/vendor/rustix/src/backend/linux_raw/fs/inotify.rs
new file mode 100644
index 0000000..851335b
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/fs/inotify.rs
@@ -0,0 +1,118 @@
+//! inotify support for working with inotifies
+
+use crate::backend::c;
+use crate::backend::fs::syscalls;
+use crate::fd::{BorrowedFd, OwnedFd};
+use crate::io;
+use bitflags::bitflags;
+
+bitflags! {
+    /// `IN_*` for use with [`inotify_init`].
+    ///
+    /// [`inotify_init`]: crate::fs::inotify::inotify_init
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct CreateFlags: c::c_uint {
+        /// `IN_CLOEXEC`
+        const CLOEXEC = linux_raw_sys::general::IN_CLOEXEC;
+        /// `IN_NONBLOCK`
+        const NONBLOCK = linux_raw_sys::general::IN_NONBLOCK;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `IN*` for use with [`inotify_add_watch`].
+    ///
+    /// [`inotify_add_watch`]: crate::fs::inotify::inotify_add_watch
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct WatchFlags: c::c_uint {
+        /// `IN_ACCESS`
+        const ACCESS = linux_raw_sys::general::IN_ACCESS;
+        /// `IN_ATTRIB`
+        const ATTRIB = linux_raw_sys::general::IN_ATTRIB;
+        /// `IN_CLOSE_NOWRITE`
+        const CLOSE_NOWRITE = linux_raw_sys::general::IN_CLOSE_NOWRITE;
+        /// `IN_CLOSE_WRITE`
+        const CLOSE_WRITE = linux_raw_sys::general::IN_CLOSE_WRITE;
+        /// `IN_CREATE`
+        const CREATE = linux_raw_sys::general::IN_CREATE;
+        /// `IN_DELETE`
+        const DELETE = linux_raw_sys::general::IN_DELETE;
+        /// `IN_DELETE_SELF`
+        const DELETE_SELF = linux_raw_sys::general::IN_DELETE_SELF;
+        /// `IN_MODIFY`
+        const MODIFY = linux_raw_sys::general::IN_MODIFY;
+        /// `IN_MOVE_SELF`
+        const MOVE_SELF = linux_raw_sys::general::IN_MOVE_SELF;
+        /// `IN_MOVED_FROM`
+        const MOVED_FROM = linux_raw_sys::general::IN_MOVED_FROM;
+        /// `IN_MOVED_TO`
+        const MOVED_TO = linux_raw_sys::general::IN_MOVED_TO;
+        /// `IN_OPEN`
+        const OPEN = linux_raw_sys::general::IN_OPEN;
+
+        /// `IN_CLOSE`
+        const CLOSE = linux_raw_sys::general::IN_CLOSE;
+        /// `IN_MOVE`
+        const MOVE = linux_raw_sys::general::IN_MOVE;
+        /// `IN_ALL_EVENTS`
+        const ALL_EVENTS = linux_raw_sys::general::IN_ALL_EVENTS;
+
+        /// `IN_DONT_FOLLOW`
+        const DONT_FOLLOW = linux_raw_sys::general::IN_DONT_FOLLOW;
+        /// `IN_EXCL_UNLINK`
+        const EXCL_UNLINK = linux_raw_sys::general::IN_EXCL_UNLINK;
+        /// `IN_MASK_ADD`
+        const MASK_ADD = linux_raw_sys::general::IN_MASK_ADD;
+        /// `IN_MASK_CREATE`
+        const MASK_CREATE = linux_raw_sys::general::IN_MASK_CREATE;
+        /// `IN_ONESHOT`
+        const ONESHOT = linux_raw_sys::general::IN_ONESHOT;
+        /// `IN_ONLYDIR`
+        const ONLYDIR = linux_raw_sys::general::IN_ONLYDIR;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `inotify_init1(flags)`—Creates a new inotify object.
+///
+/// Use the [`CreateFlags::CLOEXEC`] flag to prevent the resulting file
+/// descriptor from being implicitly passed across `exec` boundaries.
+#[doc(alias = "inotify_init1")]
+#[inline]
+pub fn inotify_init(flags: CreateFlags) -> io::Result<OwnedFd> {
+    syscalls::inotify_init1(flags)
+}
+
+/// `inotify_add_watch(self, path, flags)`—Adds a watch to inotify.
+///
+/// This registers or updates a watch for the filesystem path `path` and
+/// returns a watch descriptor corresponding to this watch.
+///
+/// Note: Due to the existence of hardlinks, providing two different paths to
+/// this method may result in it returning the same watch descriptor. An
+/// application should keep track of this externally to avoid logic errors.
+#[inline]
+pub fn inotify_add_watch<P: crate::path::Arg>(
+    inot: BorrowedFd<'_>,
+    path: P,
+    flags: WatchFlags,
+) -> io::Result<i32> {
+    path.into_with_c_str(|path| syscalls::inotify_add_watch(inot, path, flags))
+}
+
+/// `inotify_rm_watch(self, wd)`—Removes a watch from this inotify.
+///
+/// The watch descriptor provided should have previously been returned by
+/// [`inotify_add_watch`] and not previously have been removed.
+#[doc(alias = "inotify_rm_watch")]
+#[inline]
+pub fn inotify_remove_watch(inot: BorrowedFd<'_>, wd: i32) -> io::Result<()> {
+    syscalls::inotify_rm_watch(inot, wd)
+}
diff --git a/vendor/rustix/src/backend/linux_raw/fs/makedev.rs b/vendor/rustix/src/backend/linux_raw/fs/makedev.rs
new file mode 100644
index 0000000..284ba2f
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/fs/makedev.rs
@@ -0,0 +1,19 @@
+use crate::fs::Dev;
+
+#[inline]
+pub(crate) fn makedev(maj: u32, min: u32) -> Dev {
+    ((u64::from(maj) & 0xffff_f000_u64) << 32)
+        | ((u64::from(maj) & 0x0000_0fff_u64) << 8)
+        | ((u64::from(min) & 0xffff_ff00_u64) << 12)
+        | (u64::from(min) & 0x0000_00ff_u64)
+}
+
+#[inline]
+pub(crate) fn major(dev: Dev) -> u32 {
+    (((dev >> 31 >> 1) & 0xffff_f000) | ((dev >> 8) & 0x0000_0fff)) as u32
+}
+
+#[inline]
+pub(crate) fn minor(dev: Dev) -> u32 {
+    (((dev >> 12) & 0xffff_ff00) | (dev & 0x0000_00ff)) as u32
+}
diff --git a/vendor/rustix/src/backend/linux_raw/fs/mod.rs b/vendor/rustix/src/backend/linux_raw/fs/mod.rs
new file mode 100644
index 0000000..9f53c5d
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/fs/mod.rs
@@ -0,0 +1,13 @@
+#[cfg(feature = "alloc")]
+pub(crate) mod dir;
+pub mod inotify;
+pub(crate) mod makedev;
+pub(crate) mod syscalls;
+pub(crate) mod types;
+
+// TODO: Fix linux-raw-sys to define ioctl codes for sparc.
+#[cfg(any(target_arch = "sparc", target_arch = "sparc64"))]
+pub(crate) const EXT4_IOC_RESIZE_FS: u32 = 0x8008_6610;
+
+#[cfg(not(any(target_arch = "sparc", target_arch = "sparc64")))]
+pub(crate) use linux_raw_sys::ioctl::EXT4_IOC_RESIZE_FS;
diff --git a/vendor/rustix/src/backend/linux_raw/fs/syscalls.rs b/vendor/rustix/src/backend/linux_raw/fs/syscalls.rs
new file mode 100644
index 0000000..47d01df
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/fs/syscalls.rs
@@ -0,0 +1,1670 @@
+//! linux_raw syscalls supporting `rustix::fs`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code)]
+#![allow(clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::c;
+use crate::backend::conv::fs::oflags_for_open_how;
+#[cfg(any(
+    not(feature = "linux_4_11"),
+    target_arch = "aarch64",
+    target_arch = "riscv64",
+    target_arch = "mips",
+    target_arch = "mips32r6",
+))]
+use crate::backend::conv::zero;
+use crate::backend::conv::{
+    by_ref, c_int, c_uint, dev_t, opt_mut, pass_usize, raw_fd, ret, ret_c_int, ret_c_uint,
+    ret_infallible, ret_owned_fd, ret_usize, size_of, slice, slice_mut,
+};
+#[cfg(target_pointer_width = "64")]
+use crate::backend::conv::{loff_t, loff_t_from_u64, ret_u64};
+#[cfg(any(
+    target_arch = "aarch64",
+    target_arch = "riscv64",
+    target_arch = "mips64",
+    target_arch = "mips64r6",
+    target_pointer_width = "32",
+))]
+use crate::fd::AsFd;
+use crate::fd::{BorrowedFd, OwnedFd};
+use crate::ffi::CStr;
+#[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))]
+use crate::fs::CWD;
+use crate::fs::{
+    inotify, Access, Advice, AtFlags, FallocateFlags, FileType, FlockOperation, Gid, MemfdFlags,
+    Mode, OFlags, RenameFlags, ResolveFlags, SealFlags, SeekFrom, Stat, StatFs, StatVfs,
+    StatVfsMountFlags, StatxFlags, Timestamps, Uid, XattrFlags,
+};
+use crate::io;
+use core::mem::MaybeUninit;
+#[cfg(any(target_arch = "mips64", target_arch = "mips64r6"))]
+use linux_raw_sys::general::stat as linux_stat64;
+use linux_raw_sys::general::{
+    __kernel_fsid_t, open_how, statx, AT_EACCESS, AT_FDCWD, AT_REMOVEDIR, AT_SYMLINK_NOFOLLOW,
+    F_ADD_SEALS, F_GETFL, F_GET_SEALS, F_SETFL, SEEK_CUR, SEEK_DATA, SEEK_END, SEEK_HOLE, SEEK_SET,
+    STATX__RESERVED,
+};
+#[cfg(target_pointer_width = "32")]
+use {
+    crate::backend::conv::{hi, lo, slice_just_addr},
+    linux_raw_sys::general::stat64 as linux_stat64,
+    linux_raw_sys::general::timespec as __kernel_old_timespec,
+};
+
+#[inline]
+pub(crate) fn open(path: &CStr, flags: OFlags, mode: Mode) -> io::Result<OwnedFd> {
+    // Always enable support for large files.
+    let flags = flags | OFlags::from_bits_retain(c::O_LARGEFILE);
+
+    #[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))]
+    {
+        openat(CWD.as_fd(), path, flags, mode)
+    }
+    #[cfg(not(any(target_arch = "aarch64", target_arch = "riscv64")))]
+    unsafe {
+        ret_owned_fd(syscall_readonly!(__NR_open, path, flags, mode))
+    }
+}
+
+#[inline]
+pub(crate) fn openat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    flags: OFlags,
+    mode: Mode,
+) -> io::Result<OwnedFd> {
+    // Always enable support for large files.
+    let flags = flags | OFlags::from_bits_retain(c::O_LARGEFILE);
+
+    unsafe { ret_owned_fd(syscall_readonly!(__NR_openat, dirfd, path, flags, mode)) }
+}
+
+#[inline]
+pub(crate) fn openat2(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    mut flags: OFlags,
+    mode: Mode,
+    resolve: ResolveFlags,
+) -> io::Result<OwnedFd> {
+    // Enable support for large files, but not with `O_PATH` because
+    // `openat2` doesn't like those flags together.
+    if !flags.contains(OFlags::PATH) {
+        flags |= OFlags::from_bits_retain(c::O_LARGEFILE);
+    }
+
+    unsafe {
+        ret_owned_fd(syscall_readonly!(
+            __NR_openat2,
+            dirfd,
+            path,
+            by_ref(&open_how {
+                flags: oflags_for_open_how(flags),
+                mode: u64::from(mode.bits()),
+                resolve: resolve.bits(),
+            }),
+            size_of::<open_how, _>()
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn chmod(path: &CStr, mode: Mode) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fchmodat,
+            raw_fd(AT_FDCWD),
+            path,
+            mode
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn chmodat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    mode: Mode,
+    flags: AtFlags,
+) -> io::Result<()> {
+    if flags == AtFlags::SYMLINK_NOFOLLOW {
+        return Err(io::Errno::OPNOTSUPP);
+    }
+    if !flags.is_empty() {
+        return Err(io::Errno::INVAL);
+    }
+    unsafe { ret(syscall_readonly!(__NR_fchmodat, dirfd, path, mode)) }
+}
+
+#[inline]
+pub(crate) fn fchmod(fd: BorrowedFd<'_>, mode: Mode) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_fchmod, fd, mode)) }
+}
+
+#[inline]
+pub(crate) fn chownat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    owner: Option<Uid>,
+    group: Option<Gid>,
+    flags: AtFlags,
+) -> io::Result<()> {
+    unsafe {
+        let (ow, gr) = crate::ugid::translate_fchown_args(owner, group);
+        ret(syscall_readonly!(
+            __NR_fchownat,
+            dirfd,
+            path,
+            c_uint(ow),
+            c_uint(gr),
+            flags
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn chown(path: &CStr, owner: Option<Uid>, group: Option<Gid>) -> io::Result<()> {
+    // Most architectures have a `chown` syscall.
+    #[cfg(not(any(target_arch = "aarch64", target_arch = "riscv64")))]
+    unsafe {
+        let (ow, gr) = crate::ugid::translate_fchown_args(owner, group);
+        ret(syscall_readonly!(__NR_chown, path, c_uint(ow), c_uint(gr)))
+    }
+
+    // Aarch64 and RISC-V don't, so use `fchownat`.
+    #[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))]
+    unsafe {
+        let (ow, gr) = crate::ugid::translate_fchown_args(owner, group);
+        ret(syscall_readonly!(
+            __NR_fchownat,
+            raw_fd(AT_FDCWD),
+            path,
+            c_uint(ow),
+            c_uint(gr),
+            zero()
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn fchown(fd: BorrowedFd<'_>, owner: Option<Uid>, group: Option<Gid>) -> io::Result<()> {
+    unsafe {
+        let (ow, gr) = crate::ugid::translate_fchown_args(owner, group);
+        ret(syscall_readonly!(__NR_fchown, fd, c_uint(ow), c_uint(gr)))
+    }
+}
+
+#[inline]
+pub(crate) fn mknodat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    file_type: FileType,
+    mode: Mode,
+    dev: u64,
+) -> io::Result<()> {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_mknodat,
+            dirfd,
+            path,
+            (mode, file_type),
+            dev_t(dev)?
+        ))
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_mknodat,
+            dirfd,
+            path,
+            (mode, file_type),
+            dev_t(dev)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn seek(fd: BorrowedFd<'_>, pos: SeekFrom) -> io::Result<u64> {
+    let (whence, offset) = match pos {
+        SeekFrom::Start(pos) => {
+            let pos: u64 = pos;
+            // Silently cast; we'll get `EINVAL` if the value is negative.
+            (SEEK_SET, pos as i64)
+        }
+        SeekFrom::End(offset) => (SEEK_END, offset),
+        SeekFrom::Current(offset) => (SEEK_CUR, offset),
+        SeekFrom::Data(offset) => (SEEK_DATA, offset),
+        SeekFrom::Hole(offset) => (SEEK_HOLE, offset),
+    };
+    _seek(fd, offset, whence)
+}
+
+#[inline]
+pub(crate) fn _seek(fd: BorrowedFd<'_>, offset: i64, whence: c::c_uint) -> io::Result<u64> {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        let mut result = MaybeUninit::<u64>::uninit();
+        ret(syscall!(
+            __NR__llseek,
+            fd,
+            // Don't use the hi/lo functions here because Linux's llseek
+            // takes its 64-bit argument differently from everything else.
+            pass_usize((offset >> 32) as usize),
+            pass_usize(offset as usize),
+            &mut result,
+            c_uint(whence)
+        ))?;
+        Ok(result.assume_init())
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret_u64(syscall_readonly!(
+            __NR_lseek,
+            fd,
+            loff_t(offset),
+            c_uint(whence)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn tell(fd: BorrowedFd<'_>) -> io::Result<u64> {
+    _seek(fd, 0, SEEK_CUR).map(|x| x as u64)
+}
+
+#[inline]
+pub(crate) fn ftruncate(fd: BorrowedFd<'_>, length: u64) -> io::Result<()> {
+    // <https://github.com/torvalds/linux/blob/fcadab740480e0e0e9fa9bd272acd409884d431a/arch/arm64/kernel/sys32.c#L81-L83>
+    #[cfg(all(
+        target_pointer_width = "32",
+        any(
+            target_arch = "arm",
+            target_arch = "mips",
+            target_arch = "mips32r6",
+            target_arch = "powerpc"
+        ),
+    ))]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_ftruncate64,
+            fd,
+            zero(),
+            hi(length),
+            lo(length)
+        ))
+    }
+    #[cfg(all(
+        target_pointer_width = "32",
+        not(any(
+            target_arch = "arm",
+            target_arch = "mips",
+            target_arch = "mips32r6",
+            target_arch = "powerpc"
+        )),
+    ))]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_ftruncate64,
+            fd,
+            hi(length),
+            lo(length)
+        ))
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_ftruncate,
+            fd,
+            loff_t_from_u64(length)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn fallocate(
+    fd: BorrowedFd<'_>,
+    mode: FallocateFlags,
+    offset: u64,
+    len: u64,
+) -> io::Result<()> {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fallocate,
+            fd,
+            mode,
+            hi(offset),
+            lo(offset),
+            hi(len),
+            lo(len)
+        ))
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fallocate,
+            fd,
+            mode,
+            loff_t_from_u64(offset),
+            loff_t_from_u64(len)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn fadvise(fd: BorrowedFd<'_>, pos: u64, len: u64, advice: Advice) -> io::Result<()> {
+    // On ARM, the arguments are reordered so that the len and pos argument
+    // pairs are aligned. And ARM has a custom syscall code for this.
+    #[cfg(target_arch = "arm")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_arm_fadvise64_64,
+            fd,
+            advice,
+            hi(pos),
+            lo(pos),
+            hi(len),
+            lo(len)
+        ))
+    }
+
+    // On powerpc, the arguments are reordered as on ARM.
+    #[cfg(target_arch = "powerpc")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fadvise64_64,
+            fd,
+            advice,
+            hi(pos),
+            lo(pos),
+            hi(len),
+            lo(len)
+        ))
+    }
+
+    // On mips, the arguments are not reordered, and padding is inserted
+    // instead to ensure alignment.
+    #[cfg(any(target_arch = "mips", target_arch = "mips32r6"))]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fadvise64,
+            fd,
+            zero(),
+            hi(pos),
+            lo(pos),
+            hi(len),
+            lo(len),
+            advice
+        ))
+    }
+
+    // For all other 32-bit architectures, use `fadvise64_64` so that we get a
+    // 64-bit length.
+    #[cfg(all(
+        target_pointer_width = "32",
+        not(any(
+            target_arch = "arm",
+            target_arch = "mips",
+            target_arch = "mips32r6",
+            target_arch = "powerpc"
+        )),
+    ))]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fadvise64_64,
+            fd,
+            hi(pos),
+            lo(pos),
+            hi(len),
+            lo(len),
+            advice
+        ))
+    }
+
+    // On 64-bit architectures, use `fadvise64` which is sufficient.
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fadvise64,
+            fd,
+            loff_t_from_u64(pos),
+            loff_t_from_u64(len),
+            advice
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn fsync(fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_fsync, fd)) }
+}
+
+#[inline]
+pub(crate) fn fdatasync(fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_fdatasync, fd)) }
+}
+
+#[inline]
+pub(crate) fn flock(fd: BorrowedFd<'_>, operation: FlockOperation) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_flock,
+            fd,
+            c_uint(operation as c::c_uint)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn syncfs(fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_syncfs, fd)) }
+}
+
+#[inline]
+pub(crate) fn sync() {
+    unsafe { ret_infallible(syscall_readonly!(__NR_sync)) }
+}
+
+#[inline]
+pub(crate) fn fstat(fd: BorrowedFd<'_>) -> io::Result<Stat> {
+    // 32-bit and mips64 Linux: `struct stat64` is not y2038 compatible; use
+    // `statx`.
+    //
+    // And, some old platforms don't support `statx`, and some fail with a
+    // confusing error code, so we call `crate::fs::statx` to handle that. If
+    // `statx` isn't available, fall back to the buggy system call.
+    #[cfg(any(
+        target_pointer_width = "32",
+        target_arch = "mips64",
+        target_arch = "mips64r6"
+    ))]
+    {
+        match crate::fs::statx(fd, cstr!(""), AtFlags::EMPTY_PATH, StatxFlags::BASIC_STATS) {
+            Ok(x) => statx_to_stat(x),
+            Err(io::Errno::NOSYS) => fstat_old(fd),
+            Err(err) => Err(err),
+        }
+    }
+
+    #[cfg(all(
+        target_pointer_width = "64",
+        not(target_arch = "mips64"),
+        not(target_arch = "mips64r6")
+    ))]
+    unsafe {
+        let mut result = MaybeUninit::<Stat>::uninit();
+        ret(syscall!(__NR_fstat, fd, &mut result))?;
+        Ok(result.assume_init())
+    }
+}
+
+#[cfg(any(
+    target_pointer_width = "32",
+    target_arch = "mips64",
+    target_arch = "mips64r6",
+))]
+fn fstat_old(fd: BorrowedFd<'_>) -> io::Result<Stat> {
+    let mut result = MaybeUninit::<linux_stat64>::uninit();
+
+    #[cfg(any(target_arch = "mips64", target_arch = "mips64r6"))]
+    unsafe {
+        ret(syscall!(__NR_fstat, fd, &mut result))?;
+        stat_to_stat(result.assume_init())
+    }
+
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret(syscall!(__NR_fstat64, fd, &mut result))?;
+        stat_to_stat(result.assume_init())
+    }
+}
+
+#[inline]
+pub(crate) fn stat(path: &CStr) -> io::Result<Stat> {
+    // See the comments in `fstat` about using `crate::fs::statx` here.
+    #[cfg(any(
+        target_pointer_width = "32",
+        target_arch = "mips64",
+        target_arch = "mips64r6"
+    ))]
+    {
+        match crate::fs::statx(
+            crate::fs::CWD.as_fd(),
+            path,
+            AtFlags::empty(),
+            StatxFlags::BASIC_STATS,
+        ) {
+            Ok(x) => statx_to_stat(x),
+            Err(io::Errno::NOSYS) => stat_old(path),
+            Err(err) => Err(err),
+        }
+    }
+
+    #[cfg(all(
+        target_pointer_width = "64",
+        not(target_arch = "mips64"),
+        not(target_arch = "mips64r6"),
+    ))]
+    unsafe {
+        let mut result = MaybeUninit::<Stat>::uninit();
+        ret(syscall!(
+            __NR_newfstatat,
+            raw_fd(AT_FDCWD),
+            path,
+            &mut result,
+            c_uint(0)
+        ))?;
+        Ok(result.assume_init())
+    }
+}
+
+#[cfg(any(
+    target_pointer_width = "32",
+    target_arch = "mips64",
+    target_arch = "mips64r6"
+))]
+fn stat_old(path: &CStr) -> io::Result<Stat> {
+    let mut result = MaybeUninit::<linux_stat64>::uninit();
+
+    #[cfg(any(target_arch = "mips64", target_arch = "mips64r6"))]
+    unsafe {
+        ret(syscall!(
+            __NR_newfstatat,
+            raw_fd(AT_FDCWD),
+            path,
+            &mut result,
+            c_uint(0)
+        ))?;
+        stat_to_stat(result.assume_init())
+    }
+
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret(syscall!(
+            __NR_fstatat64,
+            raw_fd(AT_FDCWD),
+            path,
+            &mut result,
+            c_uint(0)
+        ))?;
+        stat_to_stat(result.assume_init())
+    }
+}
+
+#[inline]
+pub(crate) fn statat(dirfd: BorrowedFd<'_>, path: &CStr, flags: AtFlags) -> io::Result<Stat> {
+    // See the comments in `fstat` about using `crate::fs::statx` here.
+    #[cfg(any(
+        target_pointer_width = "32",
+        target_arch = "mips64",
+        target_arch = "mips64r6"
+    ))]
+    {
+        match crate::fs::statx(dirfd, path, flags, StatxFlags::BASIC_STATS) {
+            Ok(x) => statx_to_stat(x),
+            Err(io::Errno::NOSYS) => statat_old(dirfd, path, flags),
+            Err(err) => Err(err),
+        }
+    }
+
+    #[cfg(all(
+        target_pointer_width = "64",
+        not(target_arch = "mips64"),
+        not(target_arch = "mips64r6"),
+    ))]
+    unsafe {
+        let mut result = MaybeUninit::<Stat>::uninit();
+        ret(syscall!(__NR_newfstatat, dirfd, path, &mut result, flags))?;
+        Ok(result.assume_init())
+    }
+}
+
+#[cfg(any(
+    target_pointer_width = "32",
+    target_arch = "mips64",
+    target_arch = "mips64r6"
+))]
+fn statat_old(dirfd: BorrowedFd<'_>, path: &CStr, flags: AtFlags) -> io::Result<Stat> {
+    let mut result = MaybeUninit::<linux_stat64>::uninit();
+
+    #[cfg(any(target_arch = "mips64", target_arch = "mips64r6"))]
+    unsafe {
+        ret(syscall!(__NR_newfstatat, dirfd, path, &mut result, flags))?;
+        stat_to_stat(result.assume_init())
+    }
+
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret(syscall!(__NR_fstatat64, dirfd, path, &mut result, flags))?;
+        stat_to_stat(result.assume_init())
+    }
+}
+
+#[inline]
+pub(crate) fn lstat(path: &CStr) -> io::Result<Stat> {
+    // See the comments in `fstat` about using `crate::fs::statx` here.
+    #[cfg(any(target_pointer_width = "32", target_arch = "mips64"))]
+    {
+        match crate::fs::statx(
+            crate::fs::CWD.as_fd(),
+            path,
+            AtFlags::SYMLINK_NOFOLLOW,
+            StatxFlags::BASIC_STATS,
+        ) {
+            Ok(x) => statx_to_stat(x),
+            Err(io::Errno::NOSYS) => lstat_old(path),
+            Err(err) => Err(err),
+        }
+    }
+
+    #[cfg(all(target_pointer_width = "64", not(target_arch = "mips64")))]
+    unsafe {
+        let mut result = MaybeUninit::<Stat>::uninit();
+        ret(syscall!(
+            __NR_newfstatat,
+            raw_fd(AT_FDCWD),
+            path,
+            &mut result,
+            c_uint(AT_SYMLINK_NOFOLLOW)
+        ))?;
+        Ok(result.assume_init())
+    }
+}
+
+#[cfg(any(target_pointer_width = "32", target_arch = "mips64"))]
+fn lstat_old(path: &CStr) -> io::Result<Stat> {
+    let mut result = MaybeUninit::<linux_stat64>::uninit();
+
+    #[cfg(any(target_arch = "mips64", target_arch = "mips64r6"))]
+    unsafe {
+        ret(syscall!(
+            __NR_newfstatat,
+            raw_fd(AT_FDCWD),
+            path,
+            &mut result,
+            c_uint(AT_SYMLINK_NOFOLLOW)
+        ))?;
+        stat_to_stat(result.assume_init())
+    }
+
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret(syscall!(
+            __NR_fstatat64,
+            raw_fd(AT_FDCWD),
+            path,
+            &mut result,
+            c_uint(AT_SYMLINK_NOFOLLOW)
+        ))?;
+        stat_to_stat(result.assume_init())
+    }
+}
+
+/// Convert from a Linux `statx` value to rustix's `Stat`.
+#[cfg(any(
+    target_pointer_width = "32",
+    target_arch = "mips64",
+    target_arch = "mips64r6"
+))]
+fn statx_to_stat(x: crate::fs::Statx) -> io::Result<Stat> {
+    Ok(Stat {
+        st_dev: crate::fs::makedev(x.stx_dev_major, x.stx_dev_minor),
+        st_mode: x.stx_mode.into(),
+        st_nlink: x.stx_nlink.into(),
+        st_uid: x.stx_uid.into(),
+        st_gid: x.stx_gid.into(),
+        st_rdev: crate::fs::makedev(x.stx_rdev_major, x.stx_rdev_minor),
+        st_size: x.stx_size.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_blksize: x.stx_blksize.into(),
+        st_blocks: x.stx_blocks.into(),
+        st_atime: x
+            .stx_atime
+            .tv_sec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        st_atime_nsec: x.stx_atime.tv_nsec.into(),
+        st_mtime: x
+            .stx_mtime
+            .tv_sec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        st_mtime_nsec: x.stx_mtime.tv_nsec.into(),
+        st_ctime: x
+            .stx_ctime
+            .tv_sec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        st_ctime_nsec: x.stx_ctime.tv_nsec.into(),
+        st_ino: x.stx_ino.into(),
+    })
+}
+
+/// Convert from a Linux `stat64` value to rustix's `Stat`.
+#[cfg(target_pointer_width = "32")]
+fn stat_to_stat(s64: linux_raw_sys::general::stat64) -> io::Result<Stat> {
+    Ok(Stat {
+        st_dev: s64.st_dev.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_mode: s64.st_mode.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_nlink: s64.st_nlink.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_uid: s64.st_uid.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_gid: s64.st_gid.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_rdev: s64.st_rdev.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_size: s64.st_size.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_blksize: s64.st_blksize.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_blocks: s64.st_blocks.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_atime: s64.st_atime.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_atime_nsec: s64
+            .st_atime_nsec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        st_mtime: s64.st_mtime.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_mtime_nsec: s64
+            .st_mtime_nsec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        st_ctime: s64.st_ctime.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_ctime_nsec: s64
+            .st_ctime_nsec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        st_ino: s64.st_ino.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+    })
+}
+
+/// Convert from a Linux `stat` value to rustix's `Stat`.
+#[cfg(any(target_arch = "mips64", target_arch = "mips64r6"))]
+fn stat_to_stat(s: linux_raw_sys::general::stat) -> io::Result<Stat> {
+    Ok(Stat {
+        st_dev: s.st_dev.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_mode: s.st_mode.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_nlink: s.st_nlink.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_uid: s.st_uid.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_gid: s.st_gid.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_rdev: s.st_rdev.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_size: s.st_size.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_blksize: s.st_blksize.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_blocks: s.st_blocks.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_atime: s.st_atime.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_atime_nsec: s
+            .st_atime_nsec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        st_mtime: s.st_mtime.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_mtime_nsec: s
+            .st_mtime_nsec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        st_ctime: s.st_ctime.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+        st_ctime_nsec: s
+            .st_ctime_nsec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        st_ino: s.st_ino.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+    })
+}
+
+#[inline]
+pub(crate) fn statx(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    flags: AtFlags,
+    mask: StatxFlags,
+) -> io::Result<statx> {
+    // If a future Linux kernel adds more fields to `struct statx` and users
+    // passing flags unknown to rustix in `StatxFlags`, we could end up
+    // writing outside of the buffer. To prevent this possibility, we mask off
+    // any flags that we don't know about.
+    //
+    // This includes `STATX__RESERVED`, which has a value that we know, but
+    // which could take on arbitrary new meaning in the future. Linux currently
+    // rejects this flag with `EINVAL`, so we do the same.
+    //
+    // This doesn't rely on `STATX_ALL` because [it's deprecated] and already
+    // doesn't represent all the known flags.
+    //
+    // [it's deprecated]: https://patchwork.kernel.org/project/linux-fsdevel/patch/20200505095915.11275-7-mszeredi@redhat.com/
+    if (mask.bits() & STATX__RESERVED) == STATX__RESERVED {
+        return Err(io::Errno::INVAL);
+    }
+    let mask = mask & StatxFlags::all();
+
+    unsafe {
+        let mut statx_buf = MaybeUninit::<statx>::uninit();
+        ret(syscall!(
+            __NR_statx,
+            dirfd,
+            path,
+            flags,
+            mask,
+            &mut statx_buf
+        ))?;
+        Ok(statx_buf.assume_init())
+    }
+}
+
+#[cfg(not(feature = "linux_4_11"))]
+#[inline]
+pub(crate) fn is_statx_available() -> bool {
+    unsafe {
+        // Call `statx` with null pointers so that if it fails for any reason
+        // other than `EFAULT`, we know it's not supported. This can use
+        // "readonly" because we don't pass it a buffer to mutate.
+        matches!(
+            ret(syscall_readonly!(
+                __NR_statx,
+                raw_fd(AT_FDCWD),
+                zero(),
+                zero(),
+                zero(),
+                zero()
+            )),
+            Err(io::Errno::FAULT)
+        )
+    }
+}
+
+#[inline]
+pub(crate) fn fstatfs(fd: BorrowedFd<'_>) -> io::Result<StatFs> {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        let mut result = MaybeUninit::<StatFs>::uninit();
+        ret(syscall!(
+            __NR_fstatfs64,
+            fd,
+            size_of::<StatFs, _>(),
+            &mut result
+        ))?;
+        Ok(result.assume_init())
+    }
+
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        let mut result = MaybeUninit::<StatFs>::uninit();
+        ret(syscall!(__NR_fstatfs, fd, &mut result))?;
+        Ok(result.assume_init())
+    }
+}
+
+#[inline]
+pub(crate) fn fstatvfs(fd: BorrowedFd<'_>) -> io::Result<StatVfs> {
+    // Linux doesn't have an `fstatvfs` syscall; we have to do `fstatfs` and
+    // translate the fields as best we can.
+    let statfs = fstatfs(fd)?;
+
+    Ok(statfs_to_statvfs(statfs))
+}
+
+#[inline]
+pub(crate) fn statfs(path: &CStr) -> io::Result<StatFs> {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        let mut result = MaybeUninit::<StatFs>::uninit();
+        ret(syscall!(
+            __NR_statfs64,
+            path,
+            size_of::<StatFs, _>(),
+            &mut result
+        ))?;
+        Ok(result.assume_init())
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        let mut result = MaybeUninit::<StatFs>::uninit();
+        ret(syscall!(__NR_statfs, path, &mut result))?;
+        Ok(result.assume_init())
+    }
+}
+
+#[inline]
+pub(crate) fn statvfs(path: &CStr) -> io::Result<StatVfs> {
+    // Linux doesn't have a `statvfs` syscall; we have to do `statfs` and
+    // translate the fields as best we can.
+    let statfs = statfs(path)?;
+
+    Ok(statfs_to_statvfs(statfs))
+}
+
+fn statfs_to_statvfs(statfs: StatFs) -> StatVfs {
+    let __kernel_fsid_t { val } = statfs.f_fsid;
+    let [f_fsid_val0, f_fsid_val1]: [i32; 2] = val;
+
+    StatVfs {
+        f_bsize: statfs.f_bsize as u64,
+        f_frsize: if statfs.f_frsize != 0 {
+            statfs.f_frsize
+        } else {
+            statfs.f_bsize
+        } as u64,
+        f_blocks: statfs.f_blocks as u64,
+        f_bfree: statfs.f_bfree as u64,
+        f_bavail: statfs.f_bavail as u64,
+        f_files: statfs.f_files as u64,
+        f_ffree: statfs.f_ffree as u64,
+        f_favail: statfs.f_ffree as u64,
+        f_fsid: u64::from(f_fsid_val0 as u32) | u64::from(f_fsid_val1 as u32) << 32,
+        f_flag: StatVfsMountFlags::from_bits_retain(statfs.f_flags as u64),
+        f_namemax: statfs.f_namelen as u64,
+    }
+}
+
+#[cfg(feature = "alloc")]
+#[inline]
+pub(crate) fn readlink(path: &CStr, buf: &mut [u8]) -> io::Result<usize> {
+    let (buf_addr_mut, buf_len) = slice_mut(buf);
+    unsafe {
+        ret_usize(syscall!(
+            __NR_readlinkat,
+            raw_fd(AT_FDCWD),
+            path,
+            buf_addr_mut,
+            buf_len
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn readlinkat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    buf: &mut [MaybeUninit<u8>],
+) -> io::Result<usize> {
+    let (buf_addr_mut, buf_len) = slice_mut(buf);
+    unsafe {
+        ret_usize(syscall!(
+            __NR_readlinkat,
+            dirfd,
+            path,
+            buf_addr_mut,
+            buf_len
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn fcntl_getfl(fd: BorrowedFd<'_>) -> io::Result<OFlags> {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret_c_uint(syscall_readonly!(__NR_fcntl64, fd, c_uint(F_GETFL)))
+            .map(OFlags::from_bits_retain)
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret_c_uint(syscall_readonly!(__NR_fcntl, fd, c_uint(F_GETFL))).map(OFlags::from_bits_retain)
+    }
+}
+
+#[inline]
+pub(crate) fn fcntl_setfl(fd: BorrowedFd<'_>, flags: OFlags) -> io::Result<()> {
+    // Always enable support for large files.
+    let flags = flags | OFlags::from_bits_retain(c::O_LARGEFILE);
+
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret(syscall_readonly!(__NR_fcntl64, fd, c_uint(F_SETFL), flags))
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret(syscall_readonly!(__NR_fcntl, fd, c_uint(F_SETFL), flags))
+    }
+}
+
+#[inline]
+pub(crate) fn fcntl_get_seals(fd: BorrowedFd<'_>) -> io::Result<SealFlags> {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret_c_int(syscall_readonly!(__NR_fcntl64, fd, c_uint(F_GET_SEALS)))
+            .map(|seals| SealFlags::from_bits_retain(seals as u32))
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret_c_int(syscall_readonly!(__NR_fcntl, fd, c_uint(F_GET_SEALS)))
+            .map(|seals| SealFlags::from_bits_retain(seals as u32))
+    }
+}
+
+#[inline]
+pub(crate) fn fcntl_add_seals(fd: BorrowedFd<'_>, seals: SealFlags) -> io::Result<()> {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fcntl64,
+            fd,
+            c_uint(F_ADD_SEALS),
+            seals
+        ))
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fcntl,
+            fd,
+            c_uint(F_ADD_SEALS),
+            seals
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn fcntl_lock(fd: BorrowedFd<'_>, operation: FlockOperation) -> io::Result<()> {
+    #[cfg(target_pointer_width = "64")]
+    use linux_raw_sys::general::{flock, F_SETLK, F_SETLKW};
+    #[cfg(target_pointer_width = "32")]
+    use linux_raw_sys::general::{flock64 as flock, F_SETLK64 as F_SETLK, F_SETLKW64 as F_SETLKW};
+    use linux_raw_sys::general::{F_RDLCK, F_UNLCK, F_WRLCK};
+
+    let (cmd, l_type) = match operation {
+        FlockOperation::LockShared => (F_SETLKW, F_RDLCK),
+        FlockOperation::LockExclusive => (F_SETLKW, F_WRLCK),
+        FlockOperation::Unlock => (F_SETLKW, F_UNLCK),
+        FlockOperation::NonBlockingLockShared => (F_SETLK, F_RDLCK),
+        FlockOperation::NonBlockingLockExclusive => (F_SETLK, F_WRLCK),
+        FlockOperation::NonBlockingUnlock => (F_SETLK, F_UNLCK),
+    };
+
+    let lock = flock {
+        l_type: l_type as _,
+
+        // When `l_len` is zero, this locks all the bytes from
+        // `l_whence`/`l_start` to the end of the file, even as the
+        // file grows dynamically.
+        l_whence: SEEK_SET as _,
+        l_start: 0,
+        l_len: 0,
+
+        // Unused.
+        l_pid: 0,
+    };
+
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fcntl64,
+            fd,
+            c_uint(cmd),
+            by_ref(&lock)
+        ))
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fcntl,
+            fd,
+            c_uint(cmd),
+            by_ref(&lock)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn rename(old_path: &CStr, new_path: &CStr) -> io::Result<()> {
+    #[cfg(target_arch = "riscv64")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_renameat2,
+            raw_fd(AT_FDCWD),
+            old_path,
+            raw_fd(AT_FDCWD),
+            new_path,
+            c_uint(0)
+        ))
+    }
+    #[cfg(not(target_arch = "riscv64"))]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_renameat,
+            raw_fd(AT_FDCWD),
+            old_path,
+            raw_fd(AT_FDCWD),
+            new_path
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn renameat(
+    old_dirfd: BorrowedFd<'_>,
+    old_path: &CStr,
+    new_dirfd: BorrowedFd<'_>,
+    new_path: &CStr,
+) -> io::Result<()> {
+    #[cfg(target_arch = "riscv64")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_renameat2,
+            old_dirfd,
+            old_path,
+            new_dirfd,
+            new_path,
+            c_uint(0)
+        ))
+    }
+    #[cfg(not(target_arch = "riscv64"))]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_renameat,
+            old_dirfd,
+            old_path,
+            new_dirfd,
+            new_path
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn renameat2(
+    old_dirfd: BorrowedFd<'_>,
+    old_path: &CStr,
+    new_dirfd: BorrowedFd<'_>,
+    new_path: &CStr,
+    flags: RenameFlags,
+) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_renameat2,
+            old_dirfd,
+            old_path,
+            new_dirfd,
+            new_path,
+            flags
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn unlink(path: &CStr) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_unlinkat,
+            raw_fd(AT_FDCWD),
+            path,
+            c_uint(0)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn unlinkat(dirfd: BorrowedFd<'_>, path: &CStr, flags: AtFlags) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_unlinkat, dirfd, path, flags)) }
+}
+
+#[inline]
+pub(crate) fn rmdir(path: &CStr) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_unlinkat,
+            raw_fd(AT_FDCWD),
+            path,
+            c_uint(AT_REMOVEDIR)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn link(old_path: &CStr, new_path: &CStr) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_linkat,
+            raw_fd(AT_FDCWD),
+            old_path,
+            raw_fd(AT_FDCWD),
+            new_path,
+            c_uint(0)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn linkat(
+    old_dirfd: BorrowedFd<'_>,
+    old_path: &CStr,
+    new_dirfd: BorrowedFd<'_>,
+    new_path: &CStr,
+    flags: AtFlags,
+) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_linkat,
+            old_dirfd,
+            old_path,
+            new_dirfd,
+            new_path,
+            flags
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn symlink(old_path: &CStr, new_path: &CStr) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_symlinkat,
+            old_path,
+            raw_fd(AT_FDCWD),
+            new_path
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn symlinkat(old_path: &CStr, dirfd: BorrowedFd<'_>, new_path: &CStr) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_symlinkat, old_path, dirfd, new_path)) }
+}
+
+#[inline]
+pub(crate) fn mkdir(path: &CStr, mode: Mode) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_mkdirat,
+            raw_fd(AT_FDCWD),
+            path,
+            mode
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn mkdirat(dirfd: BorrowedFd<'_>, path: &CStr, mode: Mode) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_mkdirat, dirfd, path, mode)) }
+}
+
+#[cfg(feature = "alloc")]
+#[inline]
+pub(crate) fn getdents(fd: BorrowedFd<'_>, dirent: &mut [u8]) -> io::Result<usize> {
+    let (dirent_addr_mut, dirent_len) = slice_mut(dirent);
+
+    unsafe { ret_usize(syscall!(__NR_getdents64, fd, dirent_addr_mut, dirent_len)) }
+}
+
+#[inline]
+pub(crate) fn getdents_uninit(
+    fd: BorrowedFd<'_>,
+    dirent: &mut [MaybeUninit<u8>],
+) -> io::Result<usize> {
+    let (dirent_addr_mut, dirent_len) = slice_mut(dirent);
+
+    unsafe { ret_usize(syscall!(__NR_getdents64, fd, dirent_addr_mut, dirent_len)) }
+}
+
+#[inline]
+pub(crate) fn utimensat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    times: &Timestamps,
+    flags: AtFlags,
+) -> io::Result<()> {
+    _utimensat(dirfd, Some(path), times, flags)
+}
+
+#[inline]
+fn _utimensat(
+    dirfd: BorrowedFd<'_>,
+    path: Option<&CStr>,
+    times: &Timestamps,
+    flags: AtFlags,
+) -> io::Result<()> {
+    // `utimensat_time64` was introduced in Linux 5.1. The old `utimensat`
+    // syscall is not y2038-compatible on 32-bit architectures.
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        match ret(syscall_readonly!(
+            __NR_utimensat_time64,
+            dirfd,
+            path,
+            by_ref(times),
+            flags
+        )) {
+            Err(io::Errno::NOSYS) => _utimensat_old(dirfd, path, times, flags),
+            otherwise => otherwise,
+        }
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_utimensat,
+            dirfd,
+            path,
+            by_ref(times),
+            flags
+        ))
+    }
+}
+
+#[cfg(target_pointer_width = "32")]
+unsafe fn _utimensat_old(
+    dirfd: BorrowedFd<'_>,
+    path: Option<&CStr>,
+    times: &Timestamps,
+    flags: AtFlags,
+) -> io::Result<()> {
+    // See the comments in `rustix_clock_gettime_via_syscall` about
+    // emulation.
+    let old_times = [
+        __kernel_old_timespec {
+            tv_sec: times
+                .last_access
+                .tv_sec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+            tv_nsec: times
+                .last_access
+                .tv_nsec
+                .try_into()
+                .map_err(|_| io::Errno::INVAL)?,
+        },
+        __kernel_old_timespec {
+            tv_sec: times
+                .last_modification
+                .tv_sec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+            tv_nsec: times
+                .last_modification
+                .tv_nsec
+                .try_into()
+                .map_err(|_| io::Errno::INVAL)?,
+        },
+    ];
+    // The length of the array is fixed and not passed into the syscall.
+    let old_times_addr = slice_just_addr(&old_times);
+    ret(syscall_readonly!(
+        __NR_utimensat,
+        dirfd,
+        path,
+        old_times_addr,
+        flags
+    ))
+}
+
+#[inline]
+pub(crate) fn futimens(fd: BorrowedFd<'_>, times: &Timestamps) -> io::Result<()> {
+    _utimensat(fd, None, times, AtFlags::empty())
+}
+
+#[inline]
+pub(crate) fn access(path: &CStr, access: Access) -> io::Result<()> {
+    #[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))]
+    {
+        accessat_noflags(CWD.as_fd(), path, access)
+    }
+
+    #[cfg(not(any(target_arch = "aarch64", target_arch = "riscv64")))]
+    unsafe {
+        ret(syscall_readonly!(__NR_access, path, access))
+    }
+}
+
+pub(crate) fn accessat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    access: Access,
+    flags: AtFlags,
+) -> io::Result<()> {
+    if !flags
+        .difference(AtFlags::EACCESS | AtFlags::SYMLINK_NOFOLLOW)
+        .is_empty()
+    {
+        return Err(io::Errno::INVAL);
+    }
+
+    // Linux's `faccessat` syscall doesn't have a flags argument, so if we have
+    // any flags, use the newer `faccessat2` introduced in Linux 5.8 which
+    // does. Unless we're on Android where using newer system calls can cause
+    // seccomp to abort the process.
+    #[cfg(not(target_os = "android"))]
+    if !flags.is_empty() {
+        unsafe {
+            match ret(syscall_readonly!(
+                __NR_faccessat2,
+                dirfd,
+                path,
+                access,
+                flags
+            )) {
+                Ok(()) => return Ok(()),
+                Err(io::Errno::NOSYS) => {}
+                Err(other) => return Err(other),
+            }
+        }
+    }
+
+    // Linux's `faccessat` doesn't have a flags parameter. If we have
+    // `AT_EACCESS` and we're not setuid or setgid, we can emulate it.
+    if flags.is_empty()
+        || (flags.bits() == AT_EACCESS
+            && crate::backend::ugid::syscalls::getuid()
+                == crate::backend::ugid::syscalls::geteuid()
+            && crate::backend::ugid::syscalls::getgid()
+                == crate::backend::ugid::syscalls::getegid())
+    {
+        return accessat_noflags(dirfd, path, access);
+    }
+
+    Err(io::Errno::NOSYS)
+}
+
+#[inline]
+fn accessat_noflags(dirfd: BorrowedFd<'_>, path: &CStr, access: Access) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_faccessat, dirfd, path, access)) }
+}
+
+#[inline]
+pub(crate) fn copy_file_range(
+    fd_in: BorrowedFd<'_>,
+    off_in: Option<&mut u64>,
+    fd_out: BorrowedFd<'_>,
+    off_out: Option<&mut u64>,
+    len: usize,
+) -> io::Result<usize> {
+    unsafe {
+        ret_usize(syscall!(
+            __NR_copy_file_range,
+            fd_in,
+            opt_mut(off_in),
+            fd_out,
+            opt_mut(off_out),
+            pass_usize(len),
+            c_uint(0)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn memfd_create(name: &CStr, flags: MemfdFlags) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(syscall_readonly!(__NR_memfd_create, name, flags)) }
+}
+
+#[inline]
+pub(crate) fn sendfile(
+    out_fd: BorrowedFd<'_>,
+    in_fd: BorrowedFd<'_>,
+    offset: Option<&mut u64>,
+    count: usize,
+) -> io::Result<usize> {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret_usize(syscall!(
+            __NR_sendfile64,
+            out_fd,
+            in_fd,
+            opt_mut(offset),
+            pass_usize(count)
+        ))
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret_usize(syscall!(
+            __NR_sendfile,
+            out_fd,
+            in_fd,
+            opt_mut(offset),
+            pass_usize(count)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn inotify_init1(flags: inotify::CreateFlags) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(syscall_readonly!(__NR_inotify_init1, flags)) }
+}
+
+#[inline]
+pub(crate) fn inotify_add_watch(
+    infd: BorrowedFd<'_>,
+    path: &CStr,
+    flags: inotify::WatchFlags,
+) -> io::Result<i32> {
+    unsafe { ret_c_int(syscall_readonly!(__NR_inotify_add_watch, infd, path, flags)) }
+}
+
+#[inline]
+pub(crate) fn inotify_rm_watch(infd: BorrowedFd<'_>, wfd: i32) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_inotify_rm_watch, infd, c_int(wfd))) }
+}
+
+#[inline]
+pub(crate) fn getxattr(path: &CStr, name: &CStr, value: &mut [u8]) -> io::Result<usize> {
+    let (value_addr_mut, value_len) = slice_mut(value);
+    unsafe {
+        ret_usize(syscall!(
+            __NR_getxattr,
+            path,
+            name,
+            value_addr_mut,
+            value_len
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn lgetxattr(path: &CStr, name: &CStr, value: &mut [u8]) -> io::Result<usize> {
+    let (value_addr_mut, value_len) = slice_mut(value);
+    unsafe {
+        ret_usize(syscall!(
+            __NR_lgetxattr,
+            path,
+            name,
+            value_addr_mut,
+            value_len
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn fgetxattr(fd: BorrowedFd<'_>, name: &CStr, value: &mut [u8]) -> io::Result<usize> {
+    let (value_addr_mut, value_len) = slice_mut(value);
+    unsafe {
+        ret_usize(syscall!(
+            __NR_fgetxattr,
+            fd,
+            name,
+            value_addr_mut,
+            value_len
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn setxattr(
+    path: &CStr,
+    name: &CStr,
+    value: &[u8],
+    flags: XattrFlags,
+) -> io::Result<()> {
+    let (value_addr, value_len) = slice(value);
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_setxattr,
+            path,
+            name,
+            value_addr,
+            value_len,
+            flags
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn lsetxattr(
+    path: &CStr,
+    name: &CStr,
+    value: &[u8],
+    flags: XattrFlags,
+) -> io::Result<()> {
+    let (value_addr, value_len) = slice(value);
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_lsetxattr,
+            path,
+            name,
+            value_addr,
+            value_len,
+            flags
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn fsetxattr(
+    fd: BorrowedFd<'_>,
+    name: &CStr,
+    value: &[u8],
+    flags: XattrFlags,
+) -> io::Result<()> {
+    let (value_addr, value_len) = slice(value);
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fsetxattr,
+            fd,
+            name,
+            value_addr,
+            value_len,
+            flags
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn listxattr(path: &CStr, list: &mut [c::c_char]) -> io::Result<usize> {
+    let (list_addr_mut, list_len) = slice_mut(list);
+    unsafe { ret_usize(syscall!(__NR_listxattr, path, list_addr_mut, list_len)) }
+}
+
+#[inline]
+pub(crate) fn llistxattr(path: &CStr, list: &mut [c::c_char]) -> io::Result<usize> {
+    let (list_addr_mut, list_len) = slice_mut(list);
+    unsafe { ret_usize(syscall!(__NR_llistxattr, path, list_addr_mut, list_len)) }
+}
+
+#[inline]
+pub(crate) fn flistxattr(fd: BorrowedFd<'_>, list: &mut [c::c_char]) -> io::Result<usize> {
+    let (list_addr_mut, list_len) = slice_mut(list);
+    unsafe { ret_usize(syscall!(__NR_flistxattr, fd, list_addr_mut, list_len)) }
+}
+
+#[inline]
+pub(crate) fn removexattr(path: &CStr, name: &CStr) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_removexattr, path, name)) }
+}
+
+#[inline]
+pub(crate) fn lremovexattr(path: &CStr, name: &CStr) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_lremovexattr, path, name)) }
+}
+
+#[inline]
+pub(crate) fn fremovexattr(fd: BorrowedFd<'_>, name: &CStr) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_fremovexattr, fd, name)) }
+}
+
+#[test]
+fn test_sizes() {
+    assert_eq_size!(linux_raw_sys::general::__kernel_loff_t, u64);
+
+    // Assert that `Timestamps` has the expected layout.
+    assert_eq_size!([linux_raw_sys::general::__kernel_timespec; 2], Timestamps);
+}
diff --git a/vendor/rustix/src/backend/linux_raw/fs/types.rs b/vendor/rustix/src/backend/linux_raw/fs/types.rs
new file mode 100644
index 0000000..39823c4
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/fs/types.rs
@@ -0,0 +1,739 @@
+use crate::backend::c;
+use bitflags::bitflags;
+
+bitflags! {
+    /// `*_OK` constants for use with [`accessat`].
+    ///
+    /// [`accessat`]: fn.accessat.html
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct Access: c::c_uint {
+        /// `R_OK`
+        const READ_OK = linux_raw_sys::general::R_OK;
+
+        /// `W_OK`
+        const WRITE_OK = linux_raw_sys::general::W_OK;
+
+        /// `X_OK`
+        const EXEC_OK = linux_raw_sys::general::X_OK;
+
+        /// `F_OK`
+        const EXISTS = linux_raw_sys::general::F_OK;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `AT_*` constants for use with [`openat`], [`statat`], and other `*at`
+    /// functions.
+    ///
+    /// [`openat`]: crate::fs::openat
+    /// [`statat`]: crate::fs::statat
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct AtFlags: c::c_uint {
+        /// `AT_SYMLINK_NOFOLLOW`
+        const SYMLINK_NOFOLLOW = linux_raw_sys::general::AT_SYMLINK_NOFOLLOW;
+
+        /// `AT_EACCESS`
+        const EACCESS = linux_raw_sys::general::AT_EACCESS;
+
+        /// `AT_REMOVEDIR`
+        const REMOVEDIR = linux_raw_sys::general::AT_REMOVEDIR;
+
+        /// `AT_SYMLINK_FOLLOW`
+        const SYMLINK_FOLLOW = linux_raw_sys::general::AT_SYMLINK_FOLLOW;
+
+        /// `AT_NO_AUTOMOUNT`
+        const NO_AUTOMOUNT = linux_raw_sys::general::AT_NO_AUTOMOUNT;
+
+        /// `AT_EMPTY_PATH`
+        const EMPTY_PATH = linux_raw_sys::general::AT_EMPTY_PATH;
+
+        /// `AT_STATX_SYNC_AS_STAT`
+        const STATX_SYNC_AS_STAT = linux_raw_sys::general::AT_STATX_SYNC_AS_STAT;
+
+        /// `AT_STATX_FORCE_SYNC`
+        const STATX_FORCE_SYNC = linux_raw_sys::general::AT_STATX_FORCE_SYNC;
+
+        /// `AT_STATX_DONT_SYNC`
+        const STATX_DONT_SYNC = linux_raw_sys::general::AT_STATX_DONT_SYNC;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `S_I*` constants for use with [`openat`], [`chmodat`], and [`fchmod`].
+    ///
+    /// [`openat`]: crate::fs::openat
+    /// [`chmodat`]: crate::fs::chmodat
+    /// [`fchmod`]: crate::fs::fchmod
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct Mode: RawMode {
+        /// `S_IRWXU`
+        const RWXU = linux_raw_sys::general::S_IRWXU;
+
+        /// `S_IRUSR`
+        const RUSR = linux_raw_sys::general::S_IRUSR;
+
+        /// `S_IWUSR`
+        const WUSR = linux_raw_sys::general::S_IWUSR;
+
+        /// `S_IXUSR`
+        const XUSR = linux_raw_sys::general::S_IXUSR;
+
+        /// `S_IRWXG`
+        const RWXG = linux_raw_sys::general::S_IRWXG;
+
+        /// `S_IRGRP`
+        const RGRP = linux_raw_sys::general::S_IRGRP;
+
+        /// `S_IWGRP`
+        const WGRP = linux_raw_sys::general::S_IWGRP;
+
+        /// `S_IXGRP`
+        const XGRP = linux_raw_sys::general::S_IXGRP;
+
+        /// `S_IRWXO`
+        const RWXO = linux_raw_sys::general::S_IRWXO;
+
+        /// `S_IROTH`
+        const ROTH = linux_raw_sys::general::S_IROTH;
+
+        /// `S_IWOTH`
+        const WOTH = linux_raw_sys::general::S_IWOTH;
+
+        /// `S_IXOTH`
+        const XOTH = linux_raw_sys::general::S_IXOTH;
+
+        /// `S_ISUID`
+        const SUID = linux_raw_sys::general::S_ISUID;
+
+        /// `S_ISGID`
+        const SGID = linux_raw_sys::general::S_ISGID;
+
+        /// `S_ISVTX`
+        const SVTX = linux_raw_sys::general::S_ISVTX;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+impl Mode {
+    /// Construct a `Mode` from the mode bits of the `st_mode` field of a
+    /// `Mode`.
+    #[inline]
+    pub const fn from_raw_mode(st_mode: RawMode) -> Self {
+        Self::from_bits_truncate(st_mode)
+    }
+
+    /// Construct an `st_mode` value from a `Mode`.
+    #[inline]
+    pub const fn as_raw_mode(self) -> RawMode {
+        self.bits()
+    }
+}
+
+impl From<RawMode> for Mode {
+    /// Support conversions from raw mode values to `Mode`.
+    ///
+    /// ```
+    /// use rustix::fs::{Mode, RawMode};
+    /// assert_eq!(Mode::from(0o700), Mode::RWXU);
+    /// ```
+    #[inline]
+    fn from(st_mode: RawMode) -> Self {
+        Self::from_raw_mode(st_mode)
+    }
+}
+
+impl From<Mode> for RawMode {
+    /// Support conversions from `Mode` to raw mode values.
+    ///
+    /// ```
+    /// use rustix::fs::{Mode, RawMode};
+    /// assert_eq!(RawMode::from(Mode::RWXU), 0o700);
+    /// ```
+    #[inline]
+    fn from(mode: Mode) -> Self {
+        mode.as_raw_mode()
+    }
+}
+
+bitflags! {
+    /// `O_*` constants for use with [`openat`].
+    ///
+    /// [`openat`]: crate::fs::openat
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct OFlags: c::c_uint {
+        /// `O_ACCMODE`
+        const ACCMODE = linux_raw_sys::general::O_ACCMODE;
+
+        /// Similar to `ACCMODE`, but just includes the read/write flags, and
+        /// no other flags.
+        ///
+        /// On some platforms, `PATH` may be included in `ACCMODE`, when
+        /// sometimes we really just want the read/write bits. Caution is
+        /// indicated, as the presence of `PATH` may mean that the read/write
+        /// bits don't have their usual meaning.
+        const RWMODE = linux_raw_sys::general::O_RDONLY |
+                       linux_raw_sys::general::O_WRONLY |
+                       linux_raw_sys::general::O_RDWR;
+
+        /// `O_APPEND`
+        const APPEND = linux_raw_sys::general::O_APPEND;
+
+        /// `O_CREAT`
+        #[doc(alias = "CREAT")]
+        const CREATE = linux_raw_sys::general::O_CREAT;
+
+        /// `O_DIRECTORY`
+        const DIRECTORY = linux_raw_sys::general::O_DIRECTORY;
+
+        /// `O_DSYNC`.
+        const DSYNC = linux_raw_sys::general::O_SYNC;
+
+        /// `O_EXCL`
+        const EXCL = linux_raw_sys::general::O_EXCL;
+
+        /// `O_FSYNC`.
+        const FSYNC = linux_raw_sys::general::O_SYNC;
+
+        /// `O_NOFOLLOW`
+        const NOFOLLOW = linux_raw_sys::general::O_NOFOLLOW;
+
+        /// `O_NONBLOCK`
+        const NONBLOCK = linux_raw_sys::general::O_NONBLOCK;
+
+        /// `O_RDONLY`
+        const RDONLY = linux_raw_sys::general::O_RDONLY;
+
+        /// `O_WRONLY`
+        const WRONLY = linux_raw_sys::general::O_WRONLY;
+
+        /// `O_RDWR`
+        ///
+        /// This is not equal to `RDONLY | WRONLY`. It's a distinct flag.
+        const RDWR = linux_raw_sys::general::O_RDWR;
+
+        /// `O_NOCTTY`
+        const NOCTTY = linux_raw_sys::general::O_NOCTTY;
+
+        /// `O_RSYNC`.
+        const RSYNC = linux_raw_sys::general::O_SYNC;
+
+        /// `O_SYNC`
+        const SYNC = linux_raw_sys::general::O_SYNC;
+
+        /// `O_TRUNC`
+        const TRUNC = linux_raw_sys::general::O_TRUNC;
+
+        /// `O_PATH`
+        const PATH = linux_raw_sys::general::O_PATH;
+
+        /// `O_CLOEXEC`
+        const CLOEXEC = linux_raw_sys::general::O_CLOEXEC;
+
+        /// `O_TMPFILE`
+        const TMPFILE = linux_raw_sys::general::O_TMPFILE;
+
+        /// `O_NOATIME`
+        const NOATIME = linux_raw_sys::general::O_NOATIME;
+
+        /// `O_DIRECT`
+        const DIRECT = linux_raw_sys::general::O_DIRECT;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `RESOLVE_*` constants for use with [`openat2`].
+    ///
+    /// [`openat2`]: crate::fs::openat2
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct ResolveFlags: u64 {
+        /// `RESOLVE_NO_XDEV`
+        const NO_XDEV = linux_raw_sys::general::RESOLVE_NO_XDEV as u64;
+
+        /// `RESOLVE_NO_MAGICLINKS`
+        const NO_MAGICLINKS = linux_raw_sys::general::RESOLVE_NO_MAGICLINKS as u64;
+
+        /// `RESOLVE_NO_SYMLINKS`
+        const NO_SYMLINKS = linux_raw_sys::general::RESOLVE_NO_SYMLINKS as u64;
+
+        /// `RESOLVE_BENEATH`
+        const BENEATH = linux_raw_sys::general::RESOLVE_BENEATH as u64;
+
+        /// `RESOLVE_IN_ROOT`
+        const IN_ROOT = linux_raw_sys::general::RESOLVE_IN_ROOT as u64;
+
+        /// `RESOLVE_CACHED` (since Linux 5.12)
+        const CACHED = linux_raw_sys::general::RESOLVE_CACHED as u64;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `RENAME_*` constants for use with [`renameat_with`].
+    ///
+    /// [`renameat_with`]: crate::fs::renameat_with
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct RenameFlags: c::c_uint {
+        /// `RENAME_EXCHANGE`
+        const EXCHANGE = linux_raw_sys::general::RENAME_EXCHANGE;
+
+        /// `RENAME_NOREPLACE`
+        const NOREPLACE = linux_raw_sys::general::RENAME_NOREPLACE;
+
+        /// `RENAME_WHITEOUT`
+        const WHITEOUT = linux_raw_sys::general::RENAME_WHITEOUT;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `S_IF*` constants for use with [`mknodat`] and [`Stat`]'s `st_mode` field.
+///
+/// [`mknodat`]: crate::fs::mknodat
+/// [`Stat`]: crate::fs::Stat
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum FileType {
+    /// `S_IFREG`
+    RegularFile = linux_raw_sys::general::S_IFREG as isize,
+
+    /// `S_IFDIR`
+    Directory = linux_raw_sys::general::S_IFDIR as isize,
+
+    /// `S_IFLNK`
+    Symlink = linux_raw_sys::general::S_IFLNK as isize,
+
+    /// `S_IFIFO`
+    #[doc(alias = "IFO")]
+    Fifo = linux_raw_sys::general::S_IFIFO as isize,
+
+    /// `S_IFSOCK`
+    Socket = linux_raw_sys::general::S_IFSOCK as isize,
+
+    /// `S_IFCHR`
+    CharacterDevice = linux_raw_sys::general::S_IFCHR as isize,
+
+    /// `S_IFBLK`
+    BlockDevice = linux_raw_sys::general::S_IFBLK as isize,
+
+    /// An unknown filesystem object.
+    Unknown,
+}
+
+impl FileType {
+    /// Construct a `FileType` from the `S_IFMT` bits of the `st_mode` field of
+    /// a `Stat`.
+    #[inline]
+    pub const fn from_raw_mode(st_mode: RawMode) -> Self {
+        match st_mode & linux_raw_sys::general::S_IFMT {
+            linux_raw_sys::general::S_IFREG => Self::RegularFile,
+            linux_raw_sys::general::S_IFDIR => Self::Directory,
+            linux_raw_sys::general::S_IFLNK => Self::Symlink,
+            linux_raw_sys::general::S_IFIFO => Self::Fifo,
+            linux_raw_sys::general::S_IFSOCK => Self::Socket,
+            linux_raw_sys::general::S_IFCHR => Self::CharacterDevice,
+            linux_raw_sys::general::S_IFBLK => Self::BlockDevice,
+            _ => Self::Unknown,
+        }
+    }
+
+    /// Construct an `st_mode` value from a `FileType`.
+    #[inline]
+    pub const fn as_raw_mode(self) -> RawMode {
+        match self {
+            Self::RegularFile => linux_raw_sys::general::S_IFREG,
+            Self::Directory => linux_raw_sys::general::S_IFDIR,
+            Self::Symlink => linux_raw_sys::general::S_IFLNK,
+            Self::Fifo => linux_raw_sys::general::S_IFIFO,
+            Self::Socket => linux_raw_sys::general::S_IFSOCK,
+            Self::CharacterDevice => linux_raw_sys::general::S_IFCHR,
+            Self::BlockDevice => linux_raw_sys::general::S_IFBLK,
+            Self::Unknown => linux_raw_sys::general::S_IFMT,
+        }
+    }
+
+    /// Construct a `FileType` from the `d_type` field of a `c::dirent`.
+    #[inline]
+    pub(crate) const fn from_dirent_d_type(d_type: u8) -> Self {
+        match d_type as u32 {
+            linux_raw_sys::general::DT_REG => Self::RegularFile,
+            linux_raw_sys::general::DT_DIR => Self::Directory,
+            linux_raw_sys::general::DT_LNK => Self::Symlink,
+            linux_raw_sys::general::DT_SOCK => Self::Socket,
+            linux_raw_sys::general::DT_FIFO => Self::Fifo,
+            linux_raw_sys::general::DT_CHR => Self::CharacterDevice,
+            linux_raw_sys::general::DT_BLK => Self::BlockDevice,
+            // linux_raw_sys::general::DT_UNKNOWN |
+            _ => Self::Unknown,
+        }
+    }
+}
+
+/// `POSIX_FADV_*` constants for use with [`fadvise`].
+///
+/// [`fadvise`]: crate::fs::fadvise
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[repr(u32)]
+pub enum Advice {
+    /// `POSIX_FADV_NORMAL`
+    Normal = linux_raw_sys::general::POSIX_FADV_NORMAL,
+
+    /// `POSIX_FADV_SEQUENTIAL`
+    Sequential = linux_raw_sys::general::POSIX_FADV_SEQUENTIAL,
+
+    /// `POSIX_FADV_RANDOM`
+    Random = linux_raw_sys::general::POSIX_FADV_RANDOM,
+
+    /// `POSIX_FADV_NOREUSE`
+    NoReuse = linux_raw_sys::general::POSIX_FADV_NOREUSE,
+
+    /// `POSIX_FADV_WILLNEED`
+    WillNeed = linux_raw_sys::general::POSIX_FADV_WILLNEED,
+
+    /// `POSIX_FADV_DONTNEED`
+    DontNeed = linux_raw_sys::general::POSIX_FADV_DONTNEED,
+}
+
+bitflags! {
+    /// `MFD_*` constants for use with [`memfd_create`].
+    ///
+    /// [`memfd_create`]: crate::fs::memfd_create
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MemfdFlags: c::c_uint {
+        /// `MFD_CLOEXEC`
+        const CLOEXEC = linux_raw_sys::general::MFD_CLOEXEC;
+
+        /// `MFD_ALLOW_SEALING`
+        const ALLOW_SEALING = linux_raw_sys::general::MFD_ALLOW_SEALING;
+
+        /// `MFD_HUGETLB` (since Linux 4.14)
+        const HUGETLB = linux_raw_sys::general::MFD_HUGETLB;
+
+        /// `MFD_HUGE_64KB`
+        const HUGE_64KB = linux_raw_sys::general::MFD_HUGE_64KB;
+        /// `MFD_HUGE_512JB`
+        const HUGE_512KB = linux_raw_sys::general::MFD_HUGE_512KB;
+        /// `MFD_HUGE_1MB`
+        const HUGE_1MB = linux_raw_sys::general::MFD_HUGE_1MB;
+        /// `MFD_HUGE_2MB`
+        const HUGE_2MB = linux_raw_sys::general::MFD_HUGE_2MB;
+        /// `MFD_HUGE_8MB`
+        const HUGE_8MB = linux_raw_sys::general::MFD_HUGE_8MB;
+        /// `MFD_HUGE_16MB`
+        const HUGE_16MB = linux_raw_sys::general::MFD_HUGE_16MB;
+        /// `MFD_HUGE_32MB`
+        const HUGE_32MB = linux_raw_sys::general::MFD_HUGE_32MB;
+        /// `MFD_HUGE_256MB`
+        const HUGE_256MB = linux_raw_sys::general::MFD_HUGE_256MB;
+        /// `MFD_HUGE_512MB`
+        const HUGE_512MB = linux_raw_sys::general::MFD_HUGE_512MB;
+        /// `MFD_HUGE_1GB`
+        const HUGE_1GB = linux_raw_sys::general::MFD_HUGE_1GB;
+        /// `MFD_HUGE_2GB`
+        const HUGE_2GB = linux_raw_sys::general::MFD_HUGE_2GB;
+        /// `MFD_HUGE_16GB`
+        const HUGE_16GB = linux_raw_sys::general::MFD_HUGE_16GB;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `F_SEAL_*` constants for use with [`fcntl_add_seals`] and
+    /// [`fcntl_get_seals`].
+    ///
+    /// [`fcntl_add_seals`]: crate::fs::fcntl_add_seals
+    /// [`fcntl_get_seals`]: crate::fs::fcntl_get_seals
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct SealFlags: u32 {
+        /// `F_SEAL_SEAL`.
+        const SEAL = linux_raw_sys::general::F_SEAL_SEAL;
+        /// `F_SEAL_SHRINK`.
+        const SHRINK = linux_raw_sys::general::F_SEAL_SHRINK;
+        /// `F_SEAL_GROW`.
+        const GROW = linux_raw_sys::general::F_SEAL_GROW;
+        /// `F_SEAL_WRITE`.
+        const WRITE = linux_raw_sys::general::F_SEAL_WRITE;
+        /// `F_SEAL_FUTURE_WRITE` (since Linux 5.1)
+        const FUTURE_WRITE = linux_raw_sys::general::F_SEAL_FUTURE_WRITE;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `STATX_*` constants for use with [`statx`].
+    ///
+    /// [`statx`]: crate::fs::statx
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct StatxFlags: u32 {
+        /// `STATX_TYPE`
+        const TYPE = linux_raw_sys::general::STATX_TYPE;
+
+        /// `STATX_MODE`
+        const MODE = linux_raw_sys::general::STATX_MODE;
+
+        /// `STATX_NLINK`
+        const NLINK = linux_raw_sys::general::STATX_NLINK;
+
+        /// `STATX_UID`
+        const UID = linux_raw_sys::general::STATX_UID;
+
+        /// `STATX_GID`
+        const GID = linux_raw_sys::general::STATX_GID;
+
+        /// `STATX_ATIME`
+        const ATIME = linux_raw_sys::general::STATX_ATIME;
+
+        /// `STATX_MTIME`
+        const MTIME = linux_raw_sys::general::STATX_MTIME;
+
+        /// `STATX_CTIME`
+        const CTIME = linux_raw_sys::general::STATX_CTIME;
+
+        /// `STATX_INO`
+        const INO = linux_raw_sys::general::STATX_INO;
+
+        /// `STATX_SIZE`
+        const SIZE = linux_raw_sys::general::STATX_SIZE;
+
+        /// `STATX_BLOCKS`
+        const BLOCKS = linux_raw_sys::general::STATX_BLOCKS;
+
+        /// `STATX_BASIC_STATS`
+        const BASIC_STATS = linux_raw_sys::general::STATX_BASIC_STATS;
+
+        /// `STATX_BTIME`
+        const BTIME = linux_raw_sys::general::STATX_BTIME;
+
+        /// `STATX_MNT_ID` (since Linux 5.8)
+        const MNT_ID = linux_raw_sys::general::STATX_MNT_ID;
+
+        /// `STATX_DIOALIGN` (since Linux 6.1)
+        const DIOALIGN = linux_raw_sys::general::STATX_DIOALIGN;
+
+        /// `STATX_ALL`
+        const ALL = linux_raw_sys::general::STATX_ALL;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `FALLOC_FL_*` constants for use with [`fallocate`].
+    ///
+    /// [`fallocate`]: crate::fs::fallocate
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct FallocateFlags: u32 {
+        /// `FALLOC_FL_KEEP_SIZE`
+        const KEEP_SIZE = linux_raw_sys::general::FALLOC_FL_KEEP_SIZE;
+        /// `FALLOC_FL_PUNCH_HOLE`
+        const PUNCH_HOLE = linux_raw_sys::general::FALLOC_FL_PUNCH_HOLE;
+        /// `FALLOC_FL_NO_HIDE_STALE`
+        const NO_HIDE_STALE = linux_raw_sys::general::FALLOC_FL_NO_HIDE_STALE;
+        /// `FALLOC_FL_COLLAPSE_RANGE`
+        const COLLAPSE_RANGE = linux_raw_sys::general::FALLOC_FL_COLLAPSE_RANGE;
+        /// `FALLOC_FL_ZERO_RANGE`
+        const ZERO_RANGE = linux_raw_sys::general::FALLOC_FL_ZERO_RANGE;
+        /// `FALLOC_FL_INSERT_RANGE`
+        const INSERT_RANGE = linux_raw_sys::general::FALLOC_FL_INSERT_RANGE;
+        /// `FALLOC_FL_UNSHARE_RANGE`
+        const UNSHARE_RANGE = linux_raw_sys::general::FALLOC_FL_UNSHARE_RANGE;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `ST_*` constants for use with [`StatVfs`].
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct StatVfsMountFlags: u64 {
+        /// `ST_MANDLOCK`
+        const MANDLOCK = linux_raw_sys::general::MS_MANDLOCK as u64;
+
+        /// `ST_NOATIME`
+        const NOATIME = linux_raw_sys::general::MS_NOATIME as u64;
+
+        /// `ST_NODEV`
+        const NODEV = linux_raw_sys::general::MS_NODEV as u64;
+
+        /// `ST_NODIRATIME`
+        const NODIRATIME = linux_raw_sys::general::MS_NODIRATIME as u64;
+
+        /// `ST_NOEXEC`
+        const NOEXEC = linux_raw_sys::general::MS_NOEXEC as u64;
+
+        /// `ST_NOSUID`
+        const NOSUID = linux_raw_sys::general::MS_NOSUID as u64;
+
+        /// `ST_RDONLY`
+        const RDONLY = linux_raw_sys::general::MS_RDONLY as u64;
+
+        /// `ST_RELATIME`
+        const RELATIME = linux_raw_sys::general::MS_RELATIME as u64;
+
+        /// `ST_SYNCHRONOUS`
+        const SYNCHRONOUS = linux_raw_sys::general::MS_SYNCHRONOUS as u64;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `LOCK_*` constants for use with [`flock`] and [`fcntl_lock`].
+///
+/// [`flock`]: crate::fs::flock
+/// [`fcntl_lock`]: crate::fs::fcntl_lock
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+#[repr(u32)]
+pub enum FlockOperation {
+    /// `LOCK_SH`
+    LockShared = linux_raw_sys::general::LOCK_SH,
+    /// `LOCK_EX`
+    LockExclusive = linux_raw_sys::general::LOCK_EX,
+    /// `LOCK_UN`
+    Unlock = linux_raw_sys::general::LOCK_UN,
+    /// `LOCK_SH | LOCK_NB`
+    NonBlockingLockShared = linux_raw_sys::general::LOCK_SH | linux_raw_sys::general::LOCK_NB,
+    /// `LOCK_EX | LOCK_NB`
+    NonBlockingLockExclusive = linux_raw_sys::general::LOCK_EX | linux_raw_sys::general::LOCK_NB,
+    /// `LOCK_UN | LOCK_NB`
+    NonBlockingUnlock = linux_raw_sys::general::LOCK_UN | linux_raw_sys::general::LOCK_NB,
+}
+
+/// `struct stat` for use with [`statat`] and [`fstat`].
+///
+/// [`statat`]: crate::fs::statat
+/// [`fstat`]: crate::fs::fstat
+// On 32-bit, and mips64, Linux's `struct stat64` has a 32-bit `st_mtime` and
+// friends, so we use our own struct, populated from `statx` where possible, to
+// avoid the y2038 bug.
+#[cfg(any(
+    target_pointer_width = "32",
+    target_arch = "mips64",
+    target_arch = "mips64r6"
+))]
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+#[allow(missing_docs)]
+pub struct Stat {
+    pub st_dev: u64,
+    pub st_mode: u32,
+    pub st_nlink: u32,
+    pub st_uid: u32,
+    pub st_gid: u32,
+    pub st_rdev: u64,
+    pub st_size: i64,
+    pub st_blksize: u32,
+    pub st_blocks: u64,
+    pub st_atime: u64,
+    pub st_atime_nsec: u32,
+    pub st_mtime: u64,
+    pub st_mtime_nsec: u32,
+    pub st_ctime: u64,
+    pub st_ctime_nsec: u32,
+    pub st_ino: u64,
+}
+
+/// `struct stat` for use with [`statat`] and [`fstat`].
+///
+/// [`statat`]: crate::fs::statat
+/// [`fstat`]: crate::fs::fstat
+#[cfg(all(
+    target_pointer_width = "64",
+    not(target_arch = "mips64"),
+    not(target_arch = "mips64r6")
+))]
+pub type Stat = linux_raw_sys::general::stat;
+
+/// `struct statfs` for use with [`statfs`] and [`fstatfs`].
+///
+/// [`statfs`]: crate::fs::statfs
+/// [`fstatfs`]: crate::fs::fstatfs
+#[allow(clippy::module_name_repetitions)]
+pub type StatFs = linux_raw_sys::general::statfs64;
+
+/// `struct statvfs` for use with [`statvfs`] and [`fstatvfs`].
+///
+/// [`statvfs`]: crate::fs::statvfs
+/// [`fstatvfs`]: crate::fs::fstatvfs
+#[allow(missing_docs)]
+pub struct StatVfs {
+    pub f_bsize: u64,
+    pub f_frsize: u64,
+    pub f_blocks: u64,
+    pub f_bfree: u64,
+    pub f_bavail: u64,
+    pub f_files: u64,
+    pub f_ffree: u64,
+    pub f_favail: u64,
+    pub f_fsid: u64,
+    pub f_flag: StatVfsMountFlags,
+    pub f_namemax: u64,
+}
+
+/// `struct statx` for use with [`statx`].
+///
+/// [`statx`]: crate::fs::statx
+pub type Statx = linux_raw_sys::general::statx;
+
+/// `struct statx_timestamp` for use with [`Statx`].
+pub type StatxTimestamp = linux_raw_sys::general::statx_timestamp;
+
+/// `mode_t`
+#[cfg(not(any(
+    target_arch = "x86",
+    target_arch = "sparc",
+    target_arch = "avr",
+    target_arch = "arm",
+)))]
+pub type RawMode = linux_raw_sys::general::__kernel_mode_t;
+
+/// `mode_t`
+#[cfg(any(
+    target_arch = "x86",
+    target_arch = "sparc",
+    target_arch = "avr",
+    target_arch = "arm",
+))]
+// Don't use `__kernel_mode_t` since it's `u16` which differs from `st_size`.
+pub type RawMode = c::c_uint;
+
+/// `dev_t`
+// Within the kernel the dev_t is 32-bit, but userspace uses a 64-bit field.
+pub type Dev = u64;
+
+/// `__fsword_t`
+#[cfg(not(any(target_arch = "mips64", target_arch = "mips64r6")))]
+pub type FsWord = linux_raw_sys::general::__fsword_t;
+
+/// `__fsword_t`
+#[cfg(any(target_arch = "mips64", target_arch = "mips64r6"))]
+pub type FsWord = i64;
diff --git a/vendor/rustix/src/backend/linux_raw/io/errno.rs b/vendor/rustix/src/backend/linux_raw/io/errno.rs
new file mode 100644
index 0000000..bc40e9a
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/io/errno.rs
@@ -0,0 +1,553 @@
+//! The `rustix` `Errno` type.
+//!
+//! This type holds an OS error code, which conceptually corresponds to an
+//! `errno` value.
+//!
+//! # Safety
+//!
+//! Linux uses error codes in `-4095..0`; we use rustc attributes to describe
+//! this restricted range of values.
+#![allow(unsafe_code)]
+#![cfg_attr(not(rustc_attrs), allow(unused_unsafe))]
+
+use crate::backend::c;
+use crate::backend::fd::RawFd;
+use crate::backend::reg::{RetNumber, RetReg};
+use crate::io;
+use linux_raw_sys::errno;
+
+/// `errno`—An error code.
+///
+/// The error type for `rustix` APIs. This is similar to [`std::io::Error`],
+/// but only holds an OS error code, and no extra error value.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/errno.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/errno.3.html
+/// [Winsock]: https://learn.microsoft.com/en-us/windows/win32/winsock/windows-sockets-error-codes-2
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?errno
+/// [NetBSD]: https://man.netbsd.org/errno.2
+/// [OpenBSD]: https://man.openbsd.org/errno.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=errno&section=2
+/// [illumos]: https://illumos.org/man/3C/errno
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Error-Codes.html
+/// [`std::io::Error`]: Result
+#[repr(transparent)]
+#[doc(alias = "errno")]
+#[derive(Eq, PartialEq, Hash, Copy, Clone)]
+// Linux returns negated error codes, and we leave them in negated form, so
+// error codes are in `-4095..0`.
+#[cfg_attr(rustc_attrs, rustc_layout_scalar_valid_range_start(0xf001))]
+#[cfg_attr(rustc_attrs, rustc_layout_scalar_valid_range_end(0xffff))]
+pub struct Errno(u16);
+
+impl Errno {
+    /// Extract an `Errno` value from a `std::io::Error`.
+    ///
+    /// This isn't a `From` conversion because it's expected to be relatively
+    /// uncommon.
+    #[cfg(feature = "std")]
+    #[inline]
+    pub fn from_io_error(io_err: &std::io::Error) -> Option<Self> {
+        io_err.raw_os_error().and_then(|raw| {
+            // `std::io::Error` could theoretically have arbitrary OS error
+            // values, so check that they're in Linux's range.
+            if (1..4096).contains(&raw) {
+                Some(Self::from_errno(raw as u32))
+            } else {
+                None
+            }
+        })
+    }
+
+    /// Extract the raw OS error number from this error.
+    #[inline]
+    pub const fn raw_os_error(self) -> i32 {
+        (self.0 as i16 as i32).wrapping_neg()
+    }
+
+    /// Construct an `Errno` from a raw OS error number.
+    #[inline]
+    pub const fn from_raw_os_error(raw: i32) -> Self {
+        Self::from_errno(raw as u32)
+    }
+
+    /// Convert from a C `errno` value (which is positive) to an `Errno`.
+    const fn from_errno(raw: u32) -> Self {
+        // We store error values in negated form, so that we don't have to
+        // negate them after every syscall.
+        let encoded = raw.wrapping_neg() as u16;
+
+        // TODO: Use Range::contains, once that's `const`.
+        assert!(encoded >= 0xf001);
+
+        // SAFETY: Linux syscalls return negated error values in the range
+        // `-4095..0`, which we just asserted.
+        unsafe { Self(encoded) }
+    }
+}
+
+/// Check for an error from the result of a syscall which encodes a
+/// `c::c_int` on success.
+#[inline]
+pub(in crate::backend) fn try_decode_c_int<Num: RetNumber>(
+    raw: RetReg<Num>,
+) -> io::Result<c::c_int> {
+    if raw.is_in_range(-4095..0) {
+        // SAFETY: `raw` must be in `-4095..0`, and we just checked that raw is
+        // in that range.
+        return Err(unsafe { Errno(raw.decode_error_code()) });
+    }
+
+    Ok(raw.decode_c_int())
+}
+
+/// Check for an error from the result of a syscall which encodes a
+/// `c::c_uint` on success.
+#[inline]
+pub(in crate::backend) fn try_decode_c_uint<Num: RetNumber>(
+    raw: RetReg<Num>,
+) -> io::Result<c::c_uint> {
+    if raw.is_in_range(-4095..0) {
+        // SAFETY: `raw` must be in `-4095..0`, and we just checked that raw is
+        // in that range.
+        return Err(unsafe { Errno(raw.decode_error_code()) });
+    }
+
+    Ok(raw.decode_c_uint())
+}
+
+/// Check for an error from the result of a syscall which encodes a `usize` on
+/// success.
+#[inline]
+pub(in crate::backend) fn try_decode_usize<Num: RetNumber>(raw: RetReg<Num>) -> io::Result<usize> {
+    if raw.is_in_range(-4095..0) {
+        // SAFETY: `raw` must be in `-4095..0`, and we just checked that raw is
+        // in that range.
+        return Err(unsafe { Errno(raw.decode_error_code()) });
+    }
+
+    Ok(raw.decode_usize())
+}
+
+/// Check for an error from the result of a syscall which encodes a
+/// `*mut c_void` on success.
+#[inline]
+pub(in crate::backend) fn try_decode_void_star<Num: RetNumber>(
+    raw: RetReg<Num>,
+) -> io::Result<*mut c::c_void> {
+    if raw.is_in_range(-4095..0) {
+        // SAFETY: `raw` must be in `-4095..0`, and we just checked that raw is
+        // in that range.
+        return Err(unsafe { Errno(raw.decode_error_code()) });
+    }
+
+    Ok(raw.decode_void_star())
+}
+
+/// Check for an error from the result of a syscall which encodes a
+/// `u64` on success.
+#[cfg(target_pointer_width = "64")]
+#[inline]
+pub(in crate::backend) fn try_decode_u64<Num: RetNumber>(raw: RetReg<Num>) -> io::Result<u64> {
+    if raw.is_in_range(-4095..0) {
+        // SAFETY: `raw` must be in `-4095..0`, and we just checked that raw is
+        // in that range.
+        return Err(unsafe { Errno(raw.decode_error_code()) });
+    }
+
+    Ok(raw.decode_u64())
+}
+
+/// Check for an error from the result of a syscall which encodes a file
+/// descriptor on success.
+///
+/// # Safety
+///
+/// This must only be used with syscalls which return file descriptors on
+/// success.
+#[inline]
+pub(in crate::backend) unsafe fn try_decode_raw_fd<Num: RetNumber>(
+    raw: RetReg<Num>,
+) -> io::Result<RawFd> {
+    // Instead of using `check_result` here, we just check for negative, since
+    // this function is only used for system calls which return file
+    // descriptors, and this produces smaller code.
+    if raw.is_negative() {
+        debug_assert!(raw.is_in_range(-4095..0));
+
+        // Tell the optimizer that we know the value is in the error range.
+        // This helps it avoid unnecessary integer conversions.
+        #[cfg(core_intrinsics)]
+        {
+            core::intrinsics::assume(raw.is_in_range(-4095..0));
+        }
+
+        return Err(Errno(raw.decode_error_code()));
+    }
+
+    Ok(raw.decode_raw_fd())
+}
+
+/// Check for an error from the result of a syscall which encodes no value on
+/// success. On success, return the unconsumed `raw` value.
+///
+/// # Safety
+///
+/// This must only be used with syscalls which return no value on success.
+#[inline]
+pub(in crate::backend) unsafe fn try_decode_void<Num: RetNumber>(
+    raw: RetReg<Num>,
+) -> io::Result<()> {
+    // Instead of using `check_result` here, we just check for zero, since this
+    // function is only used for system calls which have no other return value,
+    // and this produces smaller code.
+    if raw.is_nonzero() {
+        debug_assert!(raw.is_in_range(-4095..0));
+
+        // Tell the optimizer that we know the value is in the error range.
+        // This helps it avoid unnecessary integer conversions.
+        #[cfg(core_intrinsics)]
+        {
+            core::intrinsics::assume(raw.is_in_range(-4095..0));
+        }
+
+        return Err(Errno(raw.decode_error_code()));
+    }
+
+    raw.decode_void();
+
+    Ok(())
+}
+
+/// Check for an error from the result of a syscall which does not return on
+/// success. On success, return the unconsumed `raw` value.
+///
+/// # Safety
+///
+/// This must only be used with syscalls which do not return on success.
+#[cfg(any(feature = "event", feature = "runtime"))]
+#[inline]
+pub(in crate::backend) unsafe fn try_decode_error<Num: RetNumber>(raw: RetReg<Num>) -> io::Errno {
+    debug_assert!(raw.is_in_range(-4095..0));
+
+    // Tell the optimizer that we know the value is in the error range.
+    // This helps it avoid unnecessary integer conversions.
+    #[cfg(core_intrinsics)]
+    {
+        core::intrinsics::assume(raw.is_in_range(-4095..0));
+    }
+
+    Errno(raw.decode_error_code())
+}
+
+/// Return the contained `usize` value.
+#[cfg(not(debug_assertions))]
+#[inline]
+pub(in crate::backend) fn decode_usize_infallible<Num: RetNumber>(raw: RetReg<Num>) -> usize {
+    raw.decode_usize()
+}
+
+/// Return the contained `c_int` value.
+#[cfg(not(debug_assertions))]
+#[inline]
+pub(in crate::backend) fn decode_c_int_infallible<Num: RetNumber>(raw: RetReg<Num>) -> c::c_int {
+    raw.decode_c_int()
+}
+
+/// Return the contained `c_uint` value.
+#[cfg(not(debug_assertions))]
+#[inline]
+pub(in crate::backend) fn decode_c_uint_infallible<Num: RetNumber>(raw: RetReg<Num>) -> c::c_uint {
+    raw.decode_c_uint()
+}
+
+impl Errno {
+    /// `EACCES`
+    #[doc(alias = "ACCES")]
+    pub const ACCESS: Self = Self::from_errno(errno::EACCES);
+    /// `EADDRINUSE`
+    pub const ADDRINUSE: Self = Self::from_errno(errno::EADDRINUSE);
+    /// `EADDRNOTAVAIL`
+    pub const ADDRNOTAVAIL: Self = Self::from_errno(errno::EADDRNOTAVAIL);
+    /// `EADV`
+    pub const ADV: Self = Self::from_errno(errno::EADV);
+    /// `EAFNOSUPPORT`
+    pub const AFNOSUPPORT: Self = Self::from_errno(errno::EAFNOSUPPORT);
+    /// `EAGAIN`
+    pub const AGAIN: Self = Self::from_errno(errno::EAGAIN);
+    /// `EALREADY`
+    pub const ALREADY: Self = Self::from_errno(errno::EALREADY);
+    /// `EBADE`
+    pub const BADE: Self = Self::from_errno(errno::EBADE);
+    /// `EBADF`
+    pub const BADF: Self = Self::from_errno(errno::EBADF);
+    /// `EBADFD`
+    pub const BADFD: Self = Self::from_errno(errno::EBADFD);
+    /// `EBADMSG`
+    pub const BADMSG: Self = Self::from_errno(errno::EBADMSG);
+    /// `EBADR`
+    pub const BADR: Self = Self::from_errno(errno::EBADR);
+    /// `EBADRQC`
+    pub const BADRQC: Self = Self::from_errno(errno::EBADRQC);
+    /// `EBADSLT`
+    pub const BADSLT: Self = Self::from_errno(errno::EBADSLT);
+    /// `EBFONT`
+    pub const BFONT: Self = Self::from_errno(errno::EBFONT);
+    /// `EBUSY`
+    pub const BUSY: Self = Self::from_errno(errno::EBUSY);
+    /// `ECANCELED`
+    pub const CANCELED: Self = Self::from_errno(errno::ECANCELED);
+    /// `ECHILD`
+    pub const CHILD: Self = Self::from_errno(errno::ECHILD);
+    /// `ECHRNG`
+    pub const CHRNG: Self = Self::from_errno(errno::ECHRNG);
+    /// `ECOMM`
+    pub const COMM: Self = Self::from_errno(errno::ECOMM);
+    /// `ECONNABORTED`
+    pub const CONNABORTED: Self = Self::from_errno(errno::ECONNABORTED);
+    /// `ECONNREFUSED`
+    pub const CONNREFUSED: Self = Self::from_errno(errno::ECONNREFUSED);
+    /// `ECONNRESET`
+    pub const CONNRESET: Self = Self::from_errno(errno::ECONNRESET);
+    /// `EDEADLK`
+    pub const DEADLK: Self = Self::from_errno(errno::EDEADLK);
+    /// `EDEADLOCK`
+    pub const DEADLOCK: Self = Self::from_errno(errno::EDEADLOCK);
+    /// `EDESTADDRREQ`
+    pub const DESTADDRREQ: Self = Self::from_errno(errno::EDESTADDRREQ);
+    /// `EDOM`
+    pub const DOM: Self = Self::from_errno(errno::EDOM);
+    /// `EDOTDOT`
+    pub const DOTDOT: Self = Self::from_errno(errno::EDOTDOT);
+    /// `EDQUOT`
+    pub const DQUOT: Self = Self::from_errno(errno::EDQUOT);
+    /// `EEXIST`
+    pub const EXIST: Self = Self::from_errno(errno::EEXIST);
+    /// `EFAULT`
+    pub const FAULT: Self = Self::from_errno(errno::EFAULT);
+    /// `EFBIG`
+    pub const FBIG: Self = Self::from_errno(errno::EFBIG);
+    /// `EHOSTDOWN`
+    pub const HOSTDOWN: Self = Self::from_errno(errno::EHOSTDOWN);
+    /// `EHOSTUNREACH`
+    pub const HOSTUNREACH: Self = Self::from_errno(errno::EHOSTUNREACH);
+    /// `EHWPOISON`
+    pub const HWPOISON: Self = Self::from_errno(errno::EHWPOISON);
+    /// `EIDRM`
+    pub const IDRM: Self = Self::from_errno(errno::EIDRM);
+    /// `EILSEQ`
+    pub const ILSEQ: Self = Self::from_errno(errno::EILSEQ);
+    /// `EINPROGRESS`
+    pub const INPROGRESS: Self = Self::from_errno(errno::EINPROGRESS);
+    /// `EINTR`.
+    ///
+    /// For a convenient way to retry system calls that exit with `INTR`, use
+    /// [`retry_on_intr`].
+    ///
+    /// [`retry_on_intr`]: io::retry_on_intr
+    pub const INTR: Self = Self::from_errno(errno::EINTR);
+    /// `EINVAL`
+    pub const INVAL: Self = Self::from_errno(errno::EINVAL);
+    /// `EIO`
+    pub const IO: Self = Self::from_errno(errno::EIO);
+    /// `EISCONN`
+    pub const ISCONN: Self = Self::from_errno(errno::EISCONN);
+    /// `EISDIR`
+    pub const ISDIR: Self = Self::from_errno(errno::EISDIR);
+    /// `EISNAM`
+    pub const ISNAM: Self = Self::from_errno(errno::EISNAM);
+    /// `EKEYEXPIRED`
+    pub const KEYEXPIRED: Self = Self::from_errno(errno::EKEYEXPIRED);
+    /// `EKEYREJECTED`
+    pub const KEYREJECTED: Self = Self::from_errno(errno::EKEYREJECTED);
+    /// `EKEYREVOKED`
+    pub const KEYREVOKED: Self = Self::from_errno(errno::EKEYREVOKED);
+    /// `EL2HLT`
+    pub const L2HLT: Self = Self::from_errno(errno::EL2HLT);
+    /// `EL2NSYNC`
+    pub const L2NSYNC: Self = Self::from_errno(errno::EL2NSYNC);
+    /// `EL3HLT`
+    pub const L3HLT: Self = Self::from_errno(errno::EL3HLT);
+    /// `EL3RST`
+    pub const L3RST: Self = Self::from_errno(errno::EL3RST);
+    /// `ELIBACC`
+    pub const LIBACC: Self = Self::from_errno(errno::ELIBACC);
+    /// `ELIBBAD`
+    pub const LIBBAD: Self = Self::from_errno(errno::ELIBBAD);
+    /// `ELIBEXEC`
+    pub const LIBEXEC: Self = Self::from_errno(errno::ELIBEXEC);
+    /// `ELIBMAX`
+    pub const LIBMAX: Self = Self::from_errno(errno::ELIBMAX);
+    /// `ELIBSCN`
+    pub const LIBSCN: Self = Self::from_errno(errno::ELIBSCN);
+    /// `ELNRNG`
+    pub const LNRNG: Self = Self::from_errno(errno::ELNRNG);
+    /// `ELOOP`
+    pub const LOOP: Self = Self::from_errno(errno::ELOOP);
+    /// `EMEDIUMTYPE`
+    pub const MEDIUMTYPE: Self = Self::from_errno(errno::EMEDIUMTYPE);
+    /// `EMFILE`
+    pub const MFILE: Self = Self::from_errno(errno::EMFILE);
+    /// `EMLINK`
+    pub const MLINK: Self = Self::from_errno(errno::EMLINK);
+    /// `EMSGSIZE`
+    pub const MSGSIZE: Self = Self::from_errno(errno::EMSGSIZE);
+    /// `EMULTIHOP`
+    pub const MULTIHOP: Self = Self::from_errno(errno::EMULTIHOP);
+    /// `ENAMETOOLONG`
+    pub const NAMETOOLONG: Self = Self::from_errno(errno::ENAMETOOLONG);
+    /// `ENAVAIL`
+    pub const NAVAIL: Self = Self::from_errno(errno::ENAVAIL);
+    /// `ENETDOWN`
+    pub const NETDOWN: Self = Self::from_errno(errno::ENETDOWN);
+    /// `ENETRESET`
+    pub const NETRESET: Self = Self::from_errno(errno::ENETRESET);
+    /// `ENETUNREACH`
+    pub const NETUNREACH: Self = Self::from_errno(errno::ENETUNREACH);
+    /// `ENFILE`
+    pub const NFILE: Self = Self::from_errno(errno::ENFILE);
+    /// `ENOANO`
+    pub const NOANO: Self = Self::from_errno(errno::ENOANO);
+    /// `ENOBUFS`
+    pub const NOBUFS: Self = Self::from_errno(errno::ENOBUFS);
+    /// `ENOCSI`
+    pub const NOCSI: Self = Self::from_errno(errno::ENOCSI);
+    /// `ENODATA`
+    #[doc(alias = "NOATTR")]
+    pub const NODATA: Self = Self::from_errno(errno::ENODATA);
+    /// `ENODEV`
+    pub const NODEV: Self = Self::from_errno(errno::ENODEV);
+    /// `ENOENT`
+    pub const NOENT: Self = Self::from_errno(errno::ENOENT);
+    /// `ENOEXEC`
+    pub const NOEXEC: Self = Self::from_errno(errno::ENOEXEC);
+    /// `ENOKEY`
+    pub const NOKEY: Self = Self::from_errno(errno::ENOKEY);
+    /// `ENOLCK`
+    pub const NOLCK: Self = Self::from_errno(errno::ENOLCK);
+    /// `ENOLINK`
+    pub const NOLINK: Self = Self::from_errno(errno::ENOLINK);
+    /// `ENOMEDIUM`
+    pub const NOMEDIUM: Self = Self::from_errno(errno::ENOMEDIUM);
+    /// `ENOMEM`
+    pub const NOMEM: Self = Self::from_errno(errno::ENOMEM);
+    /// `ENOMSG`
+    pub const NOMSG: Self = Self::from_errno(errno::ENOMSG);
+    /// `ENONET`
+    pub const NONET: Self = Self::from_errno(errno::ENONET);
+    /// `ENOPKG`
+    pub const NOPKG: Self = Self::from_errno(errno::ENOPKG);
+    /// `ENOPROTOOPT`
+    pub const NOPROTOOPT: Self = Self::from_errno(errno::ENOPROTOOPT);
+    /// `ENOSPC`
+    pub const NOSPC: Self = Self::from_errno(errno::ENOSPC);
+    /// `ENOSR`
+    pub const NOSR: Self = Self::from_errno(errno::ENOSR);
+    /// `ENOSTR`
+    pub const NOSTR: Self = Self::from_errno(errno::ENOSTR);
+    /// `ENOSYS`
+    pub const NOSYS: Self = Self::from_errno(errno::ENOSYS);
+    /// `ENOTBLK`
+    pub const NOTBLK: Self = Self::from_errno(errno::ENOTBLK);
+    /// `ENOTCONN`
+    pub const NOTCONN: Self = Self::from_errno(errno::ENOTCONN);
+    /// `ENOTDIR`
+    pub const NOTDIR: Self = Self::from_errno(errno::ENOTDIR);
+    /// `ENOTEMPTY`
+    pub const NOTEMPTY: Self = Self::from_errno(errno::ENOTEMPTY);
+    /// `ENOTNAM`
+    pub const NOTNAM: Self = Self::from_errno(errno::ENOTNAM);
+    /// `ENOTRECOVERABLE`
+    pub const NOTRECOVERABLE: Self = Self::from_errno(errno::ENOTRECOVERABLE);
+    /// `ENOTSOCK`
+    pub const NOTSOCK: Self = Self::from_errno(errno::ENOTSOCK);
+    /// `ENOTSUP`
+    // On Linux, `ENOTSUP` has the same value as `EOPNOTSUPP`.
+    pub const NOTSUP: Self = Self::from_errno(errno::EOPNOTSUPP);
+    /// `ENOTTY`
+    pub const NOTTY: Self = Self::from_errno(errno::ENOTTY);
+    /// `ENOTUNIQ`
+    pub const NOTUNIQ: Self = Self::from_errno(errno::ENOTUNIQ);
+    /// `ENXIO`
+    pub const NXIO: Self = Self::from_errno(errno::ENXIO);
+    /// `EOPNOTSUPP`
+    pub const OPNOTSUPP: Self = Self::from_errno(errno::EOPNOTSUPP);
+    /// `EOVERFLOW`
+    pub const OVERFLOW: Self = Self::from_errno(errno::EOVERFLOW);
+    /// `EOWNERDEAD`
+    pub const OWNERDEAD: Self = Self::from_errno(errno::EOWNERDEAD);
+    /// `EPERM`
+    pub const PERM: Self = Self::from_errno(errno::EPERM);
+    /// `EPFNOSUPPORT`
+    pub const PFNOSUPPORT: Self = Self::from_errno(errno::EPFNOSUPPORT);
+    /// `EPIPE`
+    pub const PIPE: Self = Self::from_errno(errno::EPIPE);
+    /// `EPROTO`
+    pub const PROTO: Self = Self::from_errno(errno::EPROTO);
+    /// `EPROTONOSUPPORT`
+    pub const PROTONOSUPPORT: Self = Self::from_errno(errno::EPROTONOSUPPORT);
+    /// `EPROTOTYPE`
+    pub const PROTOTYPE: Self = Self::from_errno(errno::EPROTOTYPE);
+    /// `ERANGE`
+    pub const RANGE: Self = Self::from_errno(errno::ERANGE);
+    /// `EREMCHG`
+    pub const REMCHG: Self = Self::from_errno(errno::EREMCHG);
+    /// `EREMOTE`
+    pub const REMOTE: Self = Self::from_errno(errno::EREMOTE);
+    /// `EREMOTEIO`
+    pub const REMOTEIO: Self = Self::from_errno(errno::EREMOTEIO);
+    /// `ERESTART`
+    pub const RESTART: Self = Self::from_errno(errno::ERESTART);
+    /// `ERFKILL`
+    pub const RFKILL: Self = Self::from_errno(errno::ERFKILL);
+    /// `EROFS`
+    pub const ROFS: Self = Self::from_errno(errno::EROFS);
+    /// `ESHUTDOWN`
+    pub const SHUTDOWN: Self = Self::from_errno(errno::ESHUTDOWN);
+    /// `ESOCKTNOSUPPORT`
+    pub const SOCKTNOSUPPORT: Self = Self::from_errno(errno::ESOCKTNOSUPPORT);
+    /// `ESPIPE`
+    pub const SPIPE: Self = Self::from_errno(errno::ESPIPE);
+    /// `ESRCH`
+    pub const SRCH: Self = Self::from_errno(errno::ESRCH);
+    /// `ESRMNT`
+    pub const SRMNT: Self = Self::from_errno(errno::ESRMNT);
+    /// `ESTALE`
+    pub const STALE: Self = Self::from_errno(errno::ESTALE);
+    /// `ESTRPIPE`
+    pub const STRPIPE: Self = Self::from_errno(errno::ESTRPIPE);
+    /// `ETIME`
+    pub const TIME: Self = Self::from_errno(errno::ETIME);
+    /// `ETIMEDOUT`
+    pub const TIMEDOUT: Self = Self::from_errno(errno::ETIMEDOUT);
+    /// `E2BIG`
+    #[doc(alias = "2BIG")]
+    pub const TOOBIG: Self = Self::from_errno(errno::E2BIG);
+    /// `ETOOMANYREFS`
+    pub const TOOMANYREFS: Self = Self::from_errno(errno::ETOOMANYREFS);
+    /// `ETXTBSY`
+    pub const TXTBSY: Self = Self::from_errno(errno::ETXTBSY);
+    /// `EUCLEAN`
+    pub const UCLEAN: Self = Self::from_errno(errno::EUCLEAN);
+    /// `EUNATCH`
+    pub const UNATCH: Self = Self::from_errno(errno::EUNATCH);
+    /// `EUSERS`
+    pub const USERS: Self = Self::from_errno(errno::EUSERS);
+    /// `EWOULDBLOCK`
+    pub const WOULDBLOCK: Self = Self::from_errno(errno::EWOULDBLOCK);
+    /// `EXDEV`
+    pub const XDEV: Self = Self::from_errno(errno::EXDEV);
+    /// `EXFULL`
+    pub const XFULL: Self = Self::from_errno(errno::EXFULL);
+}
diff --git a/vendor/rustix/src/backend/linux_raw/io/mod.rs b/vendor/rustix/src/backend/linux_raw/io/mod.rs
new file mode 100644
index 0000000..9477b9b
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/io/mod.rs
@@ -0,0 +1,3 @@
+pub(crate) mod errno;
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/linux_raw/io/syscalls.rs b/vendor/rustix/src/backend/linux_raw/io/syscalls.rs
new file mode 100644
index 0000000..c38f28f
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/io/syscalls.rs
@@ -0,0 +1,379 @@
+//! linux_raw syscalls supporting `rustix::io`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code)]
+#![allow(clippy::undocumented_unsafe_blocks)]
+
+#[cfg(target_pointer_width = "64")]
+use crate::backend::conv::loff_t_from_u64;
+#[cfg(all(
+    target_pointer_width = "32",
+    any(target_arch = "arm", target_arch = "mips", target_arch = "mips32r6"),
+))]
+use crate::backend::conv::zero;
+use crate::backend::conv::{
+    c_uint, pass_usize, raw_fd, ret, ret_c_int, ret_c_uint, ret_discarded_fd, ret_owned_fd,
+    ret_usize, slice,
+};
+#[cfg(target_pointer_width = "32")]
+use crate::backend::conv::{hi, lo};
+use crate::backend::{c, MAX_IOV};
+use crate::fd::{AsFd, BorrowedFd, OwnedFd, RawFd};
+use crate::io::{self, DupFlags, FdFlags, IoSlice, IoSliceMut, ReadWriteFlags};
+use crate::ioctl::{IoctlOutput, RawOpcode};
+#[cfg(all(feature = "fs", feature = "net"))]
+use crate::net::{RecvFlags, SendFlags};
+use core::cmp;
+use linux_raw_sys::general::{F_DUPFD_CLOEXEC, F_GETFD, F_SETFD};
+
+#[inline]
+pub(crate) unsafe fn read(fd: BorrowedFd<'_>, buf: *mut u8, len: usize) -> io::Result<usize> {
+    ret_usize(syscall!(__NR_read, fd, buf, pass_usize(len)))
+}
+
+#[inline]
+pub(crate) unsafe fn pread(
+    fd: BorrowedFd<'_>,
+    buf: *mut u8,
+    len: usize,
+    pos: u64,
+) -> io::Result<usize> {
+    // <https://github.com/torvalds/linux/blob/fcadab740480e0e0e9fa9bd272acd409884d431a/arch/arm64/kernel/sys32.c#L75>
+    #[cfg(all(
+        target_pointer_width = "32",
+        any(target_arch = "arm", target_arch = "mips", target_arch = "mips32r6"),
+    ))]
+    {
+        ret_usize(syscall!(
+            __NR_pread64,
+            fd,
+            buf,
+            pass_usize(len),
+            zero(),
+            hi(pos),
+            lo(pos)
+        ))
+    }
+    #[cfg(all(
+        target_pointer_width = "32",
+        not(any(target_arch = "arm", target_arch = "mips", target_arch = "mips32r6")),
+    ))]
+    {
+        ret_usize(syscall!(
+            __NR_pread64,
+            fd,
+            buf,
+            pass_usize(len),
+            hi(pos),
+            lo(pos)
+        ))
+    }
+    #[cfg(target_pointer_width = "64")]
+    ret_usize(syscall!(
+        __NR_pread64,
+        fd,
+        buf,
+        pass_usize(len),
+        loff_t_from_u64(pos)
+    ))
+}
+
+#[inline]
+pub(crate) fn readv(fd: BorrowedFd<'_>, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
+    let (bufs_addr, bufs_len) = slice(&bufs[..cmp::min(bufs.len(), MAX_IOV)]);
+
+    unsafe { ret_usize(syscall!(__NR_readv, fd, bufs_addr, bufs_len)) }
+}
+
+#[inline]
+pub(crate) fn preadv(
+    fd: BorrowedFd<'_>,
+    bufs: &mut [IoSliceMut<'_>],
+    pos: u64,
+) -> io::Result<usize> {
+    let (bufs_addr, bufs_len) = slice(&bufs[..cmp::min(bufs.len(), MAX_IOV)]);
+
+    // Unlike the plain "p" functions, the "pv" functions pass their offset in
+    // an endian-independent way, and always in two registers.
+    unsafe {
+        ret_usize(syscall!(
+            __NR_preadv,
+            fd,
+            bufs_addr,
+            bufs_len,
+            pass_usize(pos as usize),
+            pass_usize((pos >> 32) as usize)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn preadv2(
+    fd: BorrowedFd<'_>,
+    bufs: &mut [IoSliceMut<'_>],
+    pos: u64,
+    flags: ReadWriteFlags,
+) -> io::Result<usize> {
+    let (bufs_addr, bufs_len) = slice(&bufs[..cmp::min(bufs.len(), MAX_IOV)]);
+
+    // Unlike the plain "p" functions, the "pv" functions pass their offset in
+    // an endian-independent way, and always in two registers.
+    unsafe {
+        ret_usize(syscall!(
+            __NR_preadv2,
+            fd,
+            bufs_addr,
+            bufs_len,
+            pass_usize(pos as usize),
+            pass_usize((pos >> 32) as usize),
+            flags
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn write(fd: BorrowedFd<'_>, buf: &[u8]) -> io::Result<usize> {
+    let (buf_addr, buf_len) = slice(buf);
+
+    unsafe { ret_usize(syscall_readonly!(__NR_write, fd, buf_addr, buf_len)) }
+}
+
+#[inline]
+pub(crate) fn pwrite(fd: BorrowedFd<'_>, buf: &[u8], pos: u64) -> io::Result<usize> {
+    let (buf_addr, buf_len) = slice(buf);
+
+    // <https://github.com/torvalds/linux/blob/fcadab740480e0e0e9fa9bd272acd409884d431a/arch/arm64/kernel/sys32.c#L81-L83>
+    #[cfg(all(
+        target_pointer_width = "32",
+        any(target_arch = "arm", target_arch = "mips", target_arch = "mips32r6"),
+    ))]
+    unsafe {
+        ret_usize(syscall_readonly!(
+            __NR_pwrite64,
+            fd,
+            buf_addr,
+            buf_len,
+            zero(),
+            hi(pos),
+            lo(pos)
+        ))
+    }
+    #[cfg(all(
+        target_pointer_width = "32",
+        not(any(target_arch = "arm", target_arch = "mips", target_arch = "mips32r6")),
+    ))]
+    unsafe {
+        ret_usize(syscall_readonly!(
+            __NR_pwrite64,
+            fd,
+            buf_addr,
+            buf_len,
+            hi(pos),
+            lo(pos)
+        ))
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret_usize(syscall_readonly!(
+            __NR_pwrite64,
+            fd,
+            buf_addr,
+            buf_len,
+            loff_t_from_u64(pos)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn writev(fd: BorrowedFd<'_>, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
+    let (bufs_addr, bufs_len) = slice(&bufs[..cmp::min(bufs.len(), MAX_IOV)]);
+
+    unsafe { ret_usize(syscall_readonly!(__NR_writev, fd, bufs_addr, bufs_len)) }
+}
+
+#[inline]
+pub(crate) fn pwritev(fd: BorrowedFd<'_>, bufs: &[IoSlice<'_>], pos: u64) -> io::Result<usize> {
+    let (bufs_addr, bufs_len) = slice(&bufs[..cmp::min(bufs.len(), MAX_IOV)]);
+
+    // Unlike the plain "p" functions, the "pv" functions pass their offset in
+    // an endian-independent way, and always in two registers.
+    unsafe {
+        ret_usize(syscall_readonly!(
+            __NR_pwritev,
+            fd,
+            bufs_addr,
+            bufs_len,
+            pass_usize(pos as usize),
+            pass_usize((pos >> 32) as usize)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn pwritev2(
+    fd: BorrowedFd<'_>,
+    bufs: &[IoSlice<'_>],
+    pos: u64,
+    flags: ReadWriteFlags,
+) -> io::Result<usize> {
+    let (bufs_addr, bufs_len) = slice(&bufs[..cmp::min(bufs.len(), MAX_IOV)]);
+
+    // Unlike the plain "p" functions, the "pv" functions pass their offset in
+    // an endian-independent way, and always in two registers.
+    unsafe {
+        ret_usize(syscall_readonly!(
+            __NR_pwritev2,
+            fd,
+            bufs_addr,
+            bufs_len,
+            pass_usize(pos as usize),
+            pass_usize((pos >> 32) as usize),
+            flags
+        ))
+    }
+}
+
+#[inline]
+pub(crate) unsafe fn close(fd: RawFd) {
+    // See the documentation for [`io::close`] for why errors are ignored.
+    syscall_readonly!(__NR_close, raw_fd(fd)).decode_void();
+}
+
+#[inline]
+pub(crate) unsafe fn ioctl(
+    fd: BorrowedFd<'_>,
+    request: RawOpcode,
+    arg: *mut c::c_void,
+) -> io::Result<IoctlOutput> {
+    ret_c_int(syscall!(__NR_ioctl, fd, c_uint(request), arg))
+}
+
+#[inline]
+pub(crate) unsafe fn ioctl_readonly(
+    fd: BorrowedFd<'_>,
+    request: RawOpcode,
+    arg: *mut c::c_void,
+) -> io::Result<IoctlOutput> {
+    ret_c_int(syscall_readonly!(__NR_ioctl, fd, c_uint(request), arg))
+}
+
+#[cfg(all(feature = "fs", feature = "net"))]
+pub(crate) fn is_read_write(fd: BorrowedFd<'_>) -> io::Result<(bool, bool)> {
+    let (mut read, mut write) = crate::fs::fd::_is_file_read_write(fd)?;
+    let mut not_socket = false;
+    if read {
+        // Do a `recv` with `PEEK` and `DONTWAIT` for 1 byte. A 0 indicates
+        // the read side is shut down; an `EWOULDBLOCK` indicates the read
+        // side is still open.
+        let mut buf = [core::mem::MaybeUninit::<u8>::uninit()];
+        match unsafe {
+            crate::backend::net::syscalls::recv(
+                fd,
+                buf.as_mut_ptr() as *mut u8,
+                1,
+                RecvFlags::PEEK | RecvFlags::DONTWAIT,
+            )
+        } {
+            Ok(0) => read = false,
+            Err(err) => {
+                #[allow(unreachable_patterns)] // `EAGAIN` may equal `EWOULDBLOCK`
+                match err {
+                    io::Errno::AGAIN | io::Errno::WOULDBLOCK => (),
+                    io::Errno::NOTSOCK => not_socket = true,
+                    _ => return Err(err),
+                }
+            }
+            Ok(_) => (),
+        }
+    }
+    if write && !not_socket {
+        // Do a `send` with `DONTWAIT` for 0 bytes. An `EPIPE` indicates
+        // the write side is shut down.
+        #[allow(unreachable_patterns)] // `EAGAIN` equals `EWOULDBLOCK`
+        match crate::backend::net::syscalls::send(fd, &[], SendFlags::DONTWAIT) {
+            Err(io::Errno::AGAIN | io::Errno::WOULDBLOCK | io::Errno::NOTSOCK) => (),
+            Err(io::Errno::PIPE) => write = false,
+            Err(err) => return Err(err),
+            Ok(_) => (),
+        }
+    }
+    Ok((read, write))
+}
+
+#[inline]
+pub(crate) fn dup(fd: BorrowedFd<'_>) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(syscall_readonly!(__NR_dup, fd)) }
+}
+
+#[allow(clippy::needless_pass_by_ref_mut)]
+#[inline]
+pub(crate) fn dup2(fd: BorrowedFd<'_>, new: &mut OwnedFd) -> io::Result<()> {
+    #[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))]
+    {
+        // We don't need to worry about the difference between `dup2` and
+        // `dup3` when the file descriptors are equal because we have an
+        // `&mut OwnedFd` which means `fd` doesn't alias it.
+        dup3(fd, new, DupFlags::empty())
+    }
+
+    #[cfg(not(any(target_arch = "aarch64", target_arch = "riscv64")))]
+    unsafe {
+        ret_discarded_fd(syscall_readonly!(__NR_dup2, fd, new.as_fd()))
+    }
+}
+
+#[allow(clippy::needless_pass_by_ref_mut)]
+#[inline]
+pub(crate) fn dup3(fd: BorrowedFd<'_>, new: &mut OwnedFd, flags: DupFlags) -> io::Result<()> {
+    unsafe { ret_discarded_fd(syscall_readonly!(__NR_dup3, fd, new.as_fd(), flags)) }
+}
+
+#[inline]
+pub(crate) fn fcntl_getfd(fd: BorrowedFd<'_>) -> io::Result<FdFlags> {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret_c_uint(syscall_readonly!(__NR_fcntl64, fd, c_uint(F_GETFD)))
+            .map(FdFlags::from_bits_retain)
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret_c_uint(syscall_readonly!(__NR_fcntl, fd, c_uint(F_GETFD)))
+            .map(FdFlags::from_bits_retain)
+    }
+}
+
+#[inline]
+pub(crate) fn fcntl_setfd(fd: BorrowedFd<'_>, flags: FdFlags) -> io::Result<()> {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret(syscall_readonly!(__NR_fcntl64, fd, c_uint(F_SETFD), flags))
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret(syscall_readonly!(__NR_fcntl, fd, c_uint(F_SETFD), flags))
+    }
+}
+
+#[inline]
+pub(crate) fn fcntl_dupfd_cloexec(fd: BorrowedFd<'_>, min: RawFd) -> io::Result<OwnedFd> {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret_owned_fd(syscall_readonly!(
+            __NR_fcntl64,
+            fd,
+            c_uint(F_DUPFD_CLOEXEC),
+            raw_fd(min)
+        ))
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret_owned_fd(syscall_readonly!(
+            __NR_fcntl,
+            fd,
+            c_uint(F_DUPFD_CLOEXEC),
+            raw_fd(min)
+        ))
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/io/types.rs b/vendor/rustix/src/backend/linux_raw/io/types.rs
new file mode 100644
index 0000000..4b3dfc6
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/io/types.rs
@@ -0,0 +1,57 @@
+use crate::backend::c;
+use bitflags::bitflags;
+
+bitflags! {
+    /// `FD_*` constants for use with [`fcntl_getfd`] and [`fcntl_setfd`].
+    ///
+    /// [`fcntl_getfd`]: crate::io::fcntl_getfd
+    /// [`fcntl_setfd`]: crate::io::fcntl_setfd
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct FdFlags: c::c_uint {
+        /// `FD_CLOEXEC`
+        const CLOEXEC = linux_raw_sys::general::FD_CLOEXEC;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `RWF_*` constants for use with [`preadv2`] and [`pwritev2`].
+    ///
+    /// [`preadv2`]: crate::io::preadv2
+    /// [`pwritev2`]: crate::io::pwritev
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct ReadWriteFlags: c::c_uint {
+        /// `RWF_DSYNC` (since Linux 4.7)
+        const DSYNC = linux_raw_sys::general::RWF_DSYNC;
+        /// `RWF_HIPRI` (since Linux 4.6)
+        const HIPRI = linux_raw_sys::general::RWF_HIPRI;
+        /// `RWF_SYNC` (since Linux 4.7)
+        const SYNC = linux_raw_sys::general::RWF_SYNC;
+        /// `RWF_NOWAIT` (since Linux 4.14)
+        const NOWAIT = linux_raw_sys::general::RWF_NOWAIT;
+        /// `RWF_APPEND` (since Linux 4.16)
+        const APPEND = linux_raw_sys::general::RWF_APPEND;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `O_*` constants for use with [`dup2`].
+    ///
+    /// [`dup2`]: crate::io::dup2
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct DupFlags: c::c_uint {
+        /// `O_CLOEXEC`
+        const CLOEXEC = linux_raw_sys::general::O_CLOEXEC;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/io_uring/mod.rs b/vendor/rustix/src/backend/linux_raw/io_uring/mod.rs
new file mode 100644
index 0000000..ef944f0
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/io_uring/mod.rs
@@ -0,0 +1 @@
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/linux_raw/io_uring/syscalls.rs b/vendor/rustix/src/backend/linux_raw/io_uring/syscalls.rs
new file mode 100644
index 0000000..d10cd13
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/io_uring/syscalls.rs
@@ -0,0 +1,62 @@
+//! linux_raw syscalls supporting `rustix::io_uring`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend::syscalls` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::conv::{by_mut, c_uint, pass_usize, ret_c_uint, ret_owned_fd};
+use crate::fd::{BorrowedFd, OwnedFd};
+use crate::io;
+use crate::io_uring::{io_uring_params, IoringEnterFlags, IoringRegisterOp};
+use core::ffi::c_void;
+
+#[inline]
+pub(crate) fn io_uring_setup(entries: u32, params: &mut io_uring_params) -> io::Result<OwnedFd> {
+    unsafe {
+        ret_owned_fd(syscall!(
+            __NR_io_uring_setup,
+            c_uint(entries),
+            by_mut(params)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) unsafe fn io_uring_register(
+    fd: BorrowedFd<'_>,
+    opcode: IoringRegisterOp,
+    arg: *const c_void,
+    nr_args: u32,
+) -> io::Result<u32> {
+    ret_c_uint(syscall_readonly!(
+        __NR_io_uring_register,
+        fd,
+        c_uint(opcode as u32),
+        arg,
+        c_uint(nr_args)
+    ))
+}
+
+#[inline]
+pub(crate) unsafe fn io_uring_enter(
+    fd: BorrowedFd<'_>,
+    to_submit: u32,
+    min_complete: u32,
+    flags: IoringEnterFlags,
+    arg: *const c_void,
+    size: usize,
+) -> io::Result<u32> {
+    // This is not `_readonly` because `io_uring_enter` waits for I/O to
+    // complete, and I/O could involve writing to memory buffers, which
+    // could be a side effect depended on by the caller.
+    ret_c_uint(syscall!(
+        __NR_io_uring_enter,
+        fd,
+        c_uint(to_submit),
+        c_uint(min_complete),
+        flags,
+        arg,
+        pass_usize(size)
+    ))
+}
diff --git a/vendor/rustix/src/backend/linux_raw/mm/mod.rs b/vendor/rustix/src/backend/linux_raw/mm/mod.rs
new file mode 100644
index 0000000..1e0181a
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/mm/mod.rs
@@ -0,0 +1,2 @@
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/linux_raw/mm/syscalls.rs b/vendor/rustix/src/backend/linux_raw/mm/syscalls.rs
new file mode 100644
index 0000000..361f111
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/mm/syscalls.rs
@@ -0,0 +1,237 @@
+//! linux_raw syscalls supporting `rustix::io`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code)]
+#![allow(clippy::undocumented_unsafe_blocks)]
+
+use super::types::{
+    Advice, MapFlags, MlockAllFlags, MlockFlags, MprotectFlags, MremapFlags, MsyncFlags, ProtFlags,
+    UserfaultfdFlags,
+};
+use crate::backend::c;
+#[cfg(target_pointer_width = "64")]
+use crate::backend::conv::loff_t_from_u64;
+use crate::backend::conv::{c_uint, no_fd, pass_usize, ret, ret_owned_fd, ret_void_star};
+use crate::fd::{BorrowedFd, OwnedFd};
+use crate::io;
+use linux_raw_sys::general::MAP_ANONYMOUS;
+
+#[inline]
+pub(crate) fn madvise(addr: *mut c::c_void, len: usize, advice: Advice) -> io::Result<()> {
+    unsafe {
+        ret(syscall!(
+            __NR_madvise,
+            addr,
+            pass_usize(len),
+            c_uint(advice as c::c_uint)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) unsafe fn msync(addr: *mut c::c_void, len: usize, flags: MsyncFlags) -> io::Result<()> {
+    ret(syscall!(__NR_msync, addr, pass_usize(len), flags))
+}
+
+/// # Safety
+///
+/// `mmap` is primarily unsafe due to the `addr` parameter, as anything working
+/// with memory pointed to by raw pointers is unsafe.
+#[inline]
+pub(crate) unsafe fn mmap(
+    addr: *mut c::c_void,
+    length: usize,
+    prot: ProtFlags,
+    flags: MapFlags,
+    fd: BorrowedFd<'_>,
+    offset: u64,
+) -> io::Result<*mut c::c_void> {
+    #[cfg(target_pointer_width = "32")]
+    {
+        ret_void_star(syscall!(
+            __NR_mmap2,
+            addr,
+            pass_usize(length),
+            prot,
+            flags,
+            fd,
+            (offset / 4096)
+                .try_into()
+                .map(pass_usize)
+                .map_err(|_| io::Errno::INVAL)?
+        ))
+    }
+    #[cfg(target_pointer_width = "64")]
+    {
+        ret_void_star(syscall!(
+            __NR_mmap,
+            addr,
+            pass_usize(length),
+            prot,
+            flags,
+            fd,
+            loff_t_from_u64(offset)
+        ))
+    }
+}
+
+/// # Safety
+///
+/// `mmap` is primarily unsafe due to the `addr` parameter, as anything working
+/// with memory pointed to by raw pointers is unsafe.
+#[inline]
+pub(crate) unsafe fn mmap_anonymous(
+    addr: *mut c::c_void,
+    length: usize,
+    prot: ProtFlags,
+    flags: MapFlags,
+) -> io::Result<*mut c::c_void> {
+    #[cfg(target_pointer_width = "32")]
+    {
+        ret_void_star(syscall!(
+            __NR_mmap2,
+            addr,
+            pass_usize(length),
+            prot,
+            c_uint(flags.bits() | MAP_ANONYMOUS),
+            no_fd(),
+            pass_usize(0)
+        ))
+    }
+    #[cfg(target_pointer_width = "64")]
+    {
+        ret_void_star(syscall!(
+            __NR_mmap,
+            addr,
+            pass_usize(length),
+            prot,
+            c_uint(flags.bits() | MAP_ANONYMOUS),
+            no_fd(),
+            loff_t_from_u64(0)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) unsafe fn mprotect(
+    ptr: *mut c::c_void,
+    len: usize,
+    flags: MprotectFlags,
+) -> io::Result<()> {
+    ret(syscall!(__NR_mprotect, ptr, pass_usize(len), flags))
+}
+
+/// # Safety
+///
+/// `munmap` is primarily unsafe due to the `addr` parameter, as anything
+/// working with memory pointed to by raw pointers is unsafe.
+#[inline]
+pub(crate) unsafe fn munmap(addr: *mut c::c_void, length: usize) -> io::Result<()> {
+    ret(syscall!(__NR_munmap, addr, pass_usize(length)))
+}
+
+/// # Safety
+///
+/// `mremap` is primarily unsafe due to the `old_address` parameter, as
+/// anything working with memory pointed to by raw pointers is unsafe.
+#[inline]
+pub(crate) unsafe fn mremap(
+    old_address: *mut c::c_void,
+    old_size: usize,
+    new_size: usize,
+    flags: MremapFlags,
+) -> io::Result<*mut c::c_void> {
+    ret_void_star(syscall!(
+        __NR_mremap,
+        old_address,
+        pass_usize(old_size),
+        pass_usize(new_size),
+        flags
+    ))
+}
+
+/// # Safety
+///
+/// `mremap_fixed` is primarily unsafe due to the `old_address` and
+/// `new_address` parameters, as anything working with memory pointed to by raw
+/// pointers is unsafe.
+#[inline]
+pub(crate) unsafe fn mremap_fixed(
+    old_address: *mut c::c_void,
+    old_size: usize,
+    new_size: usize,
+    flags: MremapFlags,
+    new_address: *mut c::c_void,
+) -> io::Result<*mut c::c_void> {
+    ret_void_star(syscall!(
+        __NR_mremap,
+        old_address,
+        pass_usize(old_size),
+        pass_usize(new_size),
+        flags,
+        new_address
+    ))
+}
+
+/// # Safety
+///
+/// `mlock` operates on raw pointers and may round out to the nearest page
+/// boundaries.
+#[inline]
+pub(crate) unsafe fn mlock(addr: *mut c::c_void, length: usize) -> io::Result<()> {
+    ret(syscall!(__NR_mlock, addr, pass_usize(length)))
+}
+
+/// # Safety
+///
+/// `mlock_with` operates on raw pointers and may round out to the nearest page
+/// boundaries.
+#[inline]
+pub(crate) unsafe fn mlock_with(
+    addr: *mut c::c_void,
+    length: usize,
+    flags: MlockFlags,
+) -> io::Result<()> {
+    ret(syscall!(__NR_mlock2, addr, pass_usize(length), flags))
+}
+
+/// # Safety
+///
+/// `munlock` operates on raw pointers and may round out to the nearest page
+/// boundaries.
+#[inline]
+pub(crate) unsafe fn munlock(addr: *mut c::c_void, length: usize) -> io::Result<()> {
+    ret(syscall!(__NR_munlock, addr, pass_usize(length)))
+}
+
+#[inline]
+pub(crate) unsafe fn userfaultfd(flags: UserfaultfdFlags) -> io::Result<OwnedFd> {
+    ret_owned_fd(syscall_readonly!(__NR_userfaultfd, flags))
+}
+
+/// Locks all pages mapped into the address space of the calling process.
+///
+/// This includes the pages of the code, data, and stack segment, as well as
+/// shared libraries, user space kernel data, shared memory, and memory-mapped
+/// files. All mapped pages are guaranteed to be resident in RAM when the call
+/// returns successfully; the pages are guaranteed to stay in RAM until later
+/// unlocked.
+#[inline]
+pub(crate) fn mlockall(flags: MlockAllFlags) -> io::Result<()> {
+    // When `mlockall` is used with `MCL_ONFAULT | MCL_FUTURE`, the ordering
+    // of `mlockall` with respect to arbitrary loads may be significant,
+    // because if a load happens and evokes a fault before the `mlockall`,
+    // the memory doesn't get locked, but if the load and therefore
+    // the fault happens after, then the memory does get locked.
+    // So to be conservative in this regard, we use `syscall` instead
+    // of `syscall_readonly`
+    unsafe { ret(syscall!(__NR_mlockall, flags)) }
+}
+
+/// Unlocks all pages mapped into the address space of the calling process.
+#[inline]
+pub(crate) fn munlockall() -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_munlockall)) }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/mm/types.rs b/vendor/rustix/src/backend/linux_raw/mm/types.rs
new file mode 100644
index 0000000..68898f5
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/mm/types.rs
@@ -0,0 +1,295 @@
+use crate::backend::c;
+use bitflags::bitflags;
+
+bitflags! {
+    /// `PROT_*` flags for use with [`mmap`].
+    ///
+    /// For `PROT_NONE`, use `ProtFlags::empty()`.
+    ///
+    /// [`mmap`]: crate::mm::mmap
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct ProtFlags: u32 {
+        /// `PROT_READ`
+        const READ = linux_raw_sys::general::PROT_READ;
+        /// `PROT_WRITE`
+        const WRITE = linux_raw_sys::general::PROT_WRITE;
+        /// `PROT_EXEC`
+        const EXEC = linux_raw_sys::general::PROT_EXEC;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `PROT_*` flags for use with [`mprotect`].
+    ///
+    /// For `PROT_NONE`, use `MprotectFlags::empty()`.
+    ///
+    /// [`mprotect`]: crate::mm::mprotect
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MprotectFlags: u32 {
+        /// `PROT_READ`
+        const READ = linux_raw_sys::general::PROT_READ;
+        /// `PROT_WRITE`
+        const WRITE = linux_raw_sys::general::PROT_WRITE;
+        /// `PROT_EXEC`
+        const EXEC = linux_raw_sys::general::PROT_EXEC;
+        /// `PROT_GROWSUP`
+        const GROWSUP = linux_raw_sys::general::PROT_GROWSUP;
+        /// `PROT_GROWSDOWN`
+        const GROWSDOWN = linux_raw_sys::general::PROT_GROWSDOWN;
+        /// `PROT_SEM`
+        const SEM = linux_raw_sys::general::PROT_SEM;
+        /// `PROT_BTI`
+        #[cfg(target_arch = "aarch64")]
+        const BTI = linux_raw_sys::general::PROT_BTI;
+        /// `PROT_MTE`
+        #[cfg(target_arch = "aarch64")]
+        const MTE = linux_raw_sys::general::PROT_MTE;
+        /// `PROT_SAO`
+        #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
+        const SAO = linux_raw_sys::general::PROT_SAO;
+        /// `PROT_ADI`
+        #[cfg(any(target_arch = "sparc", target_arch = "sparc64"))]
+        const ADI = linux_raw_sys::general::PROT_ADI;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `MAP_*` flags for use with [`mmap`].
+    ///
+    /// For `MAP_ANONYMOUS` (aka `MAP_ANON`), see [`mmap_anonymous`].
+    ///
+    /// [`mmap`]: crate::mm::mmap
+    /// [`mmap_anonymous`]: crates::mm::mmap_anonymous
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MapFlags: u32 {
+        /// `MAP_SHARED`
+        const SHARED = linux_raw_sys::general::MAP_SHARED;
+        /// `MAP_SHARED_VALIDATE` (since Linux 4.15)
+        const SHARED_VALIDATE = linux_raw_sys::general::MAP_SHARED_VALIDATE;
+        /// `MAP_PRIVATE`
+        const PRIVATE = linux_raw_sys::general::MAP_PRIVATE;
+        /// `MAP_DENYWRITE`
+        const DENYWRITE = linux_raw_sys::general::MAP_DENYWRITE;
+        /// `MAP_FIXED`
+        const FIXED = linux_raw_sys::general::MAP_FIXED;
+        /// `MAP_FIXED_NOREPLACE` (since Linux 4.17)
+        const FIXED_NOREPLACE = linux_raw_sys::general::MAP_FIXED_NOREPLACE;
+        /// `MAP_GROWSDOWN`
+        const GROWSDOWN = linux_raw_sys::general::MAP_GROWSDOWN;
+        /// `MAP_HUGETLB`
+        const HUGETLB = linux_raw_sys::general::MAP_HUGETLB;
+        /// `MAP_HUGE_2MB` (since Linux 3.8)
+        const HUGE_2MB = linux_raw_sys::general::MAP_HUGE_2MB;
+        /// `MAP_HUGE_1GB` (since Linux 3.8)
+        const HUGE_1GB = linux_raw_sys::general::MAP_HUGE_1GB;
+        /// `MAP_LOCKED`
+        const LOCKED = linux_raw_sys::general::MAP_LOCKED;
+        /// `MAP_NORESERVE`
+        const NORESERVE = linux_raw_sys::general::MAP_NORESERVE;
+        /// `MAP_POPULATE`
+        const POPULATE = linux_raw_sys::general::MAP_POPULATE;
+        /// `MAP_STACK`
+        const STACK = linux_raw_sys::general::MAP_STACK;
+        /// `MAP_SYNC` (since Linux 4.15)
+        #[cfg(not(any(target_arch = "mips", target_arch = "mips32r6", target_arch = "mips64", target_arch = "mips64r6")))]
+        const SYNC = linux_raw_sys::general::MAP_SYNC;
+        /// `MAP_UNINITIALIZED`
+        #[cfg(not(any(target_arch = "mips", target_arch = "mips32r6", target_arch = "mips64", target_arch = "mips64r6")))]
+        const UNINITIALIZED = linux_raw_sys::general::MAP_UNINITIALIZED;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `MREMAP_*` flags for use with [`mremap`].
+    ///
+    /// For `MREMAP_FIXED`, see [`mremap_fixed`].
+    ///
+    /// [`mremap`]: crate::mm::mremap
+    /// [`mremap_fixed`]: crate::mm::mremap_fixed
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MremapFlags: u32 {
+        /// `MREMAP_MAYMOVE`
+        const MAYMOVE = linux_raw_sys::general::MREMAP_MAYMOVE;
+        /// `MREMAP_DONTUNMAP` (since Linux 5.7)
+        const DONTUNMAP = linux_raw_sys::general::MREMAP_DONTUNMAP;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `MS_*` flags for use with [`msync`].
+    ///
+    /// [`msync`]: crate::mm::msync
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MsyncFlags: u32 {
+        /// `MS_SYNC`—Requests an update and waits for it to complete.
+        const SYNC = linux_raw_sys::general::MS_SYNC;
+        /// `MS_ASYNC`—Specifies that an update be scheduled, but the call
+        /// returns immediately.
+        const ASYNC = linux_raw_sys::general::MS_ASYNC;
+        /// `MS_INVALIDATE`—Asks to invalidate other mappings of the same
+        /// file (so that they can be updated with the fresh values just
+        /// written).
+        const INVALIDATE = linux_raw_sys::general::MS_INVALIDATE;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `MLOCK_*` flags for use with [`mlock_with`].
+    ///
+    /// [`mlock_with`]: crate::mm::mlock_with
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MlockFlags: u32 {
+        /// `MLOCK_ONFAULT`
+        const ONFAULT = linux_raw_sys::general::MLOCK_ONFAULT;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `POSIX_MADV_*` constants for use with [`madvise`].
+///
+/// [`madvise`]: crate::mm::madvise
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[repr(u32)]
+#[non_exhaustive]
+pub enum Advice {
+    /// `POSIX_MADV_NORMAL`
+    Normal = linux_raw_sys::general::MADV_NORMAL,
+
+    /// `POSIX_MADV_SEQUENTIAL`
+    Sequential = linux_raw_sys::general::MADV_SEQUENTIAL,
+
+    /// `POSIX_MADV_RANDOM`
+    Random = linux_raw_sys::general::MADV_RANDOM,
+
+    /// `POSIX_MADV_WILLNEED`
+    WillNeed = linux_raw_sys::general::MADV_WILLNEED,
+
+    /// `MADV_DONTNEED`
+    LinuxDontNeed = linux_raw_sys::general::MADV_DONTNEED,
+
+    /// `MADV_FREE` (since Linux 4.5)
+    LinuxFree = linux_raw_sys::general::MADV_FREE,
+    /// `MADV_REMOVE`
+    LinuxRemove = linux_raw_sys::general::MADV_REMOVE,
+    /// `MADV_DONTFORK`
+    LinuxDontFork = linux_raw_sys::general::MADV_DONTFORK,
+    /// `MADV_DOFORK`
+    LinuxDoFork = linux_raw_sys::general::MADV_DOFORK,
+    /// `MADV_HWPOISON`
+    LinuxHwPoison = linux_raw_sys::general::MADV_HWPOISON,
+    /// `MADV_SOFT_OFFLINE`
+    #[cfg(not(any(
+        target_arch = "mips",
+        target_arch = "mips32r6",
+        target_arch = "mips64",
+        target_arch = "mips64r6"
+    )))]
+    LinuxSoftOffline = linux_raw_sys::general::MADV_SOFT_OFFLINE,
+    /// `MADV_MERGEABLE`
+    LinuxMergeable = linux_raw_sys::general::MADV_MERGEABLE,
+    /// `MADV_UNMERGEABLE`
+    LinuxUnmergeable = linux_raw_sys::general::MADV_UNMERGEABLE,
+    /// `MADV_HUGEPAGE`
+    LinuxHugepage = linux_raw_sys::general::MADV_HUGEPAGE,
+    /// `MADV_NOHUGEPAGE`
+    LinuxNoHugepage = linux_raw_sys::general::MADV_NOHUGEPAGE,
+    /// `MADV_DONTDUMP` (since Linux 3.4)
+    LinuxDontDump = linux_raw_sys::general::MADV_DONTDUMP,
+    /// `MADV_DODUMP` (since Linux 3.4)
+    LinuxDoDump = linux_raw_sys::general::MADV_DODUMP,
+    /// `MADV_WIPEONFORK` (since Linux 4.14)
+    LinuxWipeOnFork = linux_raw_sys::general::MADV_WIPEONFORK,
+    /// `MADV_KEEPONFORK` (since Linux 4.14)
+    LinuxKeepOnFork = linux_raw_sys::general::MADV_KEEPONFORK,
+    /// `MADV_COLD` (since Linux 5.4)
+    LinuxCold = linux_raw_sys::general::MADV_COLD,
+    /// `MADV_PAGEOUT` (since Linux 5.4)
+    LinuxPageOut = linux_raw_sys::general::MADV_PAGEOUT,
+    /// `MADV_POPULATE_READ` (since Linux 5.14)
+    LinuxPopulateRead = linux_raw_sys::general::MADV_POPULATE_READ,
+    /// `MADV_POPULATE_WRITE` (since Linux 5.14)
+    LinuxPopulateWrite = linux_raw_sys::general::MADV_POPULATE_WRITE,
+    /// `MADV_DONTNEED_LOCKED` (since Linux 5.18)
+    LinuxDontneedLocked = linux_raw_sys::general::MADV_DONTNEED_LOCKED,
+}
+
+#[allow(non_upper_case_globals)]
+impl Advice {
+    /// `POSIX_MADV_DONTNEED`
+    ///
+    /// On Linux, this is mapped to `POSIX_MADV_NORMAL` because Linux's
+    /// `MADV_DONTNEED` differs from `POSIX_MADV_DONTNEED`. See `LinuxDontNeed`
+    /// for the Linux behavior.
+    pub const DontNeed: Self = Self::Normal;
+}
+
+bitflags! {
+    /// `O_*` flags for use with [`userfaultfd`].
+    ///
+    /// [`userfaultfd`]: crate::mm::userfaultfd
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct UserfaultfdFlags: c::c_uint {
+        /// `O_CLOEXEC`
+        const CLOEXEC = linux_raw_sys::general::O_CLOEXEC;
+        /// `O_NONBLOCK`
+        const NONBLOCK = linux_raw_sys::general::O_NONBLOCK;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `MCL_*` flags for use with [`mlockall`].
+    ///
+    /// [`mlockall`]: crate::mm::mlockall
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MlockAllFlags: u32 {
+        /// Used together with `MCL_CURRENT`, `MCL_FUTURE`, or both. Mark all
+        /// current (with `MCL_CURRENT`) or future (with `MCL_FUTURE`) mappings
+        /// to lock pages when they are faulted in. When used with
+        /// `MCL_CURRENT`, all present pages are locked, but `mlockall` will
+        /// not fault in non-present pages. When used with `MCL_FUTURE`, all
+        /// future mappings will be marked to lock pages when they are faulted
+        /// in, but they will not be populated by the lock when the mapping is
+        /// created. `MCL_ONFAULT` must be used with either `MCL_CURRENT` or
+        /// `MCL_FUTURE` or both.
+        const ONFAULT = linux_raw_sys::general::MCL_ONFAULT;
+        /// Lock all pages which will become mapped into the address space of
+        /// the process in the future. These could be, for instance, new pages
+        /// required by a growing heap and stack as well as new memory-mapped
+        /// files or shared memory regions.
+        const FUTURE = linux_raw_sys::general::MCL_FUTURE;
+        /// Lock all pages which are currently mapped into the address space of
+        /// the process.
+        const CURRENT = linux_raw_sys::general::MCL_CURRENT;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/mod.rs b/vendor/rustix/src/backend/linux_raw/mod.rs
new file mode 100644
index 0000000..0d4e533
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/mod.rs
@@ -0,0 +1,117 @@
+//! The linux_raw backend.
+//!
+//! This makes Linux syscalls directly, without going through libc.
+//!
+//! # Safety
+//!
+//! These files performs raw system calls, and sometimes passes them
+//! uninitialized memory buffers. The signatures in this file are currently
+//! manually maintained and must correspond with the signatures of the actual
+//! Linux syscalls.
+//!
+//! Some of this could be auto-generated from the Linux header file
+//! <linux/syscalls.h>, but we often need more information than it provides,
+//! such as which pointers are array slices, out parameters, or in-out
+//! parameters, which integers are owned or borrowed file descriptors, etc.
+
+#[macro_use]
+mod arch;
+mod conv;
+mod reg;
+#[cfg(any(feature = "time", feature = "process", target_arch = "x86"))]
+mod vdso;
+#[cfg(any(feature = "time", feature = "process", target_arch = "x86"))]
+mod vdso_wrappers;
+
+#[cfg(feature = "event")]
+pub(crate) mod event;
+#[cfg(any(
+    feature = "fs",
+    all(
+        not(feature = "use-libc-auxv"),
+        not(feature = "use-explicitly-provided-auxv"),
+        any(
+            feature = "param",
+            feature = "process",
+            feature = "runtime",
+            feature = "time",
+            target_arch = "x86",
+        )
+    )
+))]
+pub(crate) mod fs;
+pub(crate) mod io;
+#[cfg(feature = "io_uring")]
+pub(crate) mod io_uring;
+#[cfg(feature = "mm")]
+pub(crate) mod mm;
+#[cfg(feature = "mount")]
+pub(crate) mod mount;
+#[cfg(all(feature = "fs", not(feature = "mount")))]
+pub(crate) mod mount; // for deprecated mount functions in "fs"
+#[cfg(feature = "net")]
+pub(crate) mod net;
+#[cfg(any(
+    feature = "param",
+    feature = "process",
+    feature = "runtime",
+    feature = "time",
+    target_arch = "x86",
+))]
+pub(crate) mod param;
+#[cfg(feature = "pipe")]
+pub(crate) mod pipe;
+#[cfg(feature = "process")]
+pub(crate) mod process;
+#[cfg(feature = "pty")]
+pub(crate) mod pty;
+#[cfg(feature = "rand")]
+pub(crate) mod rand;
+#[cfg(feature = "runtime")]
+pub(crate) mod runtime;
+#[cfg(feature = "shm")]
+pub(crate) mod shm;
+#[cfg(feature = "system")]
+pub(crate) mod system;
+#[cfg(feature = "termios")]
+pub(crate) mod termios;
+#[cfg(feature = "thread")]
+pub(crate) mod thread;
+#[cfg(feature = "time")]
+pub(crate) mod time;
+
+pub(crate) mod fd {
+    pub use crate::maybe_polyfill::os::fd::{
+        AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd,
+    };
+}
+
+// The linux_raw backend doesn't use actual libc, so we define selected
+// libc-like definitions in a module called `c`.
+pub(crate) mod c;
+
+// Private modules used by multiple public modules.
+#[cfg(any(feature = "procfs", feature = "process", feature = "runtime"))]
+pub(crate) mod pid;
+#[cfg(any(feature = "process", feature = "thread"))]
+pub(crate) mod prctl;
+#[cfg(any(
+    feature = "fs",
+    feature = "process",
+    feature = "thread",
+    all(
+        not(feature = "use-libc-auxv"),
+        not(feature = "use-explicitly-provided-auxv"),
+        any(
+            feature = "param",
+            feature = "runtime",
+            feature = "time",
+            target_arch = "x86",
+        )
+    )
+))]
+pub(crate) mod ugid;
+
+/// The maximum number of buffers that can be passed into a vectored I/O system
+/// call on the current platform.
+const MAX_IOV: usize = linux_raw_sys::general::UIO_MAXIOV as usize;
diff --git a/vendor/rustix/src/backend/linux_raw/mount/mod.rs b/vendor/rustix/src/backend/linux_raw/mount/mod.rs
new file mode 100644
index 0000000..1e0181a
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/mount/mod.rs
@@ -0,0 +1,2 @@
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/linux_raw/mount/syscalls.rs b/vendor/rustix/src/backend/linux_raw/mount/syscalls.rs
new file mode 100644
index 0000000..5cb80cc
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/mount/syscalls.rs
@@ -0,0 +1,239 @@
+//! linux_raw syscalls supporting `rustix::mount`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code)]
+#![allow(clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::conv::ret;
+#[cfg(feature = "mount")]
+use crate::backend::conv::{ret_owned_fd, slice, zero};
+#[cfg(feature = "mount")]
+use crate::fd::{BorrowedFd, OwnedFd};
+use crate::ffi::CStr;
+use crate::io;
+
+#[inline]
+pub(crate) fn mount(
+    source: Option<&CStr>,
+    target: &CStr,
+    file_system_type: Option<&CStr>,
+    flags: super::types::MountFlagsArg,
+    data: Option<&CStr>,
+) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_mount,
+            source,
+            target,
+            file_system_type,
+            flags,
+            data
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn unmount(target: &CStr, flags: super::types::UnmountFlags) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_umount2, target, flags)) }
+}
+
+#[cfg(feature = "mount")]
+#[inline]
+pub(crate) fn fsopen(fs_name: &CStr, flags: super::types::FsOpenFlags) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(syscall_readonly!(__NR_fsopen, fs_name, flags)) }
+}
+
+#[cfg(feature = "mount")]
+#[inline]
+pub(crate) fn fsmount(
+    fs_fd: BorrowedFd<'_>,
+    flags: super::types::FsMountFlags,
+    attr_flags: super::types::MountAttrFlags,
+) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(syscall_readonly!(__NR_fsmount, fs_fd, flags, attr_flags)) }
+}
+
+#[cfg(feature = "mount")]
+#[inline]
+pub(crate) fn move_mount(
+    from_dfd: BorrowedFd<'_>,
+    from_pathname: &CStr,
+    to_dfd: BorrowedFd<'_>,
+    to_pathname: &CStr,
+    flags: super::types::MoveMountFlags,
+) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_move_mount,
+            from_dfd,
+            from_pathname,
+            to_dfd,
+            to_pathname,
+            flags
+        ))
+    }
+}
+
+#[cfg(feature = "mount")]
+#[inline]
+pub(crate) fn open_tree(
+    dfd: BorrowedFd<'_>,
+    filename: &CStr,
+    flags: super::types::OpenTreeFlags,
+) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(syscall_readonly!(__NR_open_tree, dfd, filename, flags)) }
+}
+
+#[cfg(feature = "mount")]
+#[inline]
+pub(crate) fn fspick(
+    dfd: BorrowedFd<'_>,
+    path: &CStr,
+    flags: super::types::FsPickFlags,
+) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(syscall_readonly!(__NR_fspick, dfd, path, flags)) }
+}
+
+#[cfg(feature = "mount")]
+#[inline]
+pub(crate) fn fsconfig_set_flag(fs_fd: BorrowedFd<'_>, key: &CStr) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fsconfig,
+            fs_fd,
+            super::types::FsConfigCmd::SetFlag,
+            key,
+            zero(),
+            zero()
+        ))
+    }
+}
+
+#[cfg(feature = "mount")]
+#[inline]
+pub(crate) fn fsconfig_set_string(
+    fs_fd: BorrowedFd<'_>,
+    key: &CStr,
+    value: &CStr,
+) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fsconfig,
+            fs_fd,
+            super::types::FsConfigCmd::SetString,
+            key,
+            value,
+            zero()
+        ))
+    }
+}
+
+#[cfg(feature = "mount")]
+#[inline]
+pub(crate) fn fsconfig_set_binary(
+    fs_fd: BorrowedFd<'_>,
+    key: &CStr,
+    value: &[u8],
+) -> io::Result<()> {
+    let (value_addr, value_len) = slice(value);
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fsconfig,
+            fs_fd,
+            super::types::FsConfigCmd::SetBinary,
+            key,
+            value_addr,
+            value_len
+        ))
+    }
+}
+
+#[cfg(feature = "mount")]
+#[inline]
+pub(crate) fn fsconfig_set_fd(
+    fs_fd: BorrowedFd<'_>,
+    key: &CStr,
+    fd: BorrowedFd<'_>,
+) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fsconfig,
+            fs_fd,
+            super::types::FsConfigCmd::SetFd,
+            key,
+            zero(),
+            fd
+        ))
+    }
+}
+
+#[cfg(feature = "mount")]
+#[inline]
+pub(crate) fn fsconfig_set_path(
+    fs_fd: BorrowedFd<'_>,
+    key: &CStr,
+    path: &CStr,
+    fd: BorrowedFd<'_>,
+) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fsconfig,
+            fs_fd,
+            super::types::FsConfigCmd::SetPath,
+            key,
+            path,
+            fd
+        ))
+    }
+}
+
+#[cfg(feature = "mount")]
+#[inline]
+pub(crate) fn fsconfig_set_path_empty(
+    fs_fd: BorrowedFd<'_>,
+    key: &CStr,
+    fd: BorrowedFd<'_>,
+) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fsconfig,
+            fs_fd,
+            super::types::FsConfigCmd::SetPathEmpty,
+            key,
+            cstr!(""),
+            fd
+        ))
+    }
+}
+
+#[cfg(feature = "mount")]
+#[inline]
+pub(crate) fn fsconfig_create(fs_fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fsconfig,
+            fs_fd,
+            super::types::FsConfigCmd::Create,
+            zero(),
+            zero(),
+            zero()
+        ))
+    }
+}
+
+#[cfg(feature = "mount")]
+#[inline]
+pub(crate) fn fsconfig_reconfigure(fs_fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fsconfig,
+            fs_fd,
+            super::types::FsConfigCmd::Reconfigure,
+            zero(),
+            zero(),
+            zero()
+        ))
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/mount/types.rs b/vendor/rustix/src/backend/linux_raw/mount/types.rs
new file mode 100644
index 0000000..43cb8c0
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/mount/types.rs
@@ -0,0 +1,332 @@
+use crate::backend::c;
+use bitflags::bitflags;
+
+bitflags! {
+    /// `MS_*` constants for use with [`mount`].
+    ///
+    /// [`mount`]: crate::mount::mount
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MountFlags: c::c_uint {
+        /// `MS_BIND`
+        const BIND = linux_raw_sys::general::MS_BIND;
+
+        /// `MS_DIRSYNC`
+        const DIRSYNC = linux_raw_sys::general::MS_DIRSYNC;
+
+        /// `MS_LAZYTIME`
+        const LAZYTIME = linux_raw_sys::general::MS_LAZYTIME;
+
+        /// `MS_MANDLOCK`
+        #[doc(alias = "MANDLOCK")]
+        const PERMIT_MANDATORY_FILE_LOCKING = linux_raw_sys::general::MS_MANDLOCK;
+
+        /// `MS_NOATIME`
+        const NOATIME = linux_raw_sys::general::MS_NOATIME;
+
+        /// `MS_NODEV`
+        const NODEV = linux_raw_sys::general::MS_NODEV;
+
+        /// `MS_NODIRATIME`
+        const NODIRATIME = linux_raw_sys::general::MS_NODIRATIME;
+
+        /// `MS_NOEXEC`
+        const NOEXEC = linux_raw_sys::general::MS_NOEXEC;
+
+        /// `MS_NOSUID`
+        const NOSUID = linux_raw_sys::general::MS_NOSUID;
+
+        /// `MS_RDONLY`
+        const RDONLY = linux_raw_sys::general::MS_RDONLY;
+
+        /// `MS_REC`
+        const REC = linux_raw_sys::general::MS_REC;
+
+        /// `MS_RELATIME`
+        const RELATIME = linux_raw_sys::general::MS_RELATIME;
+
+        /// `MS_SILENT`
+        const SILENT = linux_raw_sys::general::MS_SILENT;
+
+        /// `MS_STRICTATIME`
+        const STRICTATIME = linux_raw_sys::general::MS_STRICTATIME;
+
+        /// `MS_SYNCHRONOUS`
+        const SYNCHRONOUS = linux_raw_sys::general::MS_SYNCHRONOUS;
+
+        /// `MS_NOSYMFOLLOW`
+        const NOSYMFOLLOW = linux_raw_sys::general::MS_NOSYMFOLLOW;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `MNT_*` constants for use with [`unmount`].
+    ///
+    /// [`unmount`]: crate::mount::unmount
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct UnmountFlags: c::c_uint {
+        /// `MNT_FORCE`
+        const FORCE = linux_raw_sys::general::MNT_FORCE;
+        /// `MNT_DETACH`
+        const DETACH = linux_raw_sys::general::MNT_DETACH;
+        /// `MNT_EXPIRE`
+        const EXPIRE = linux_raw_sys::general::MNT_EXPIRE;
+        /// `UMOUNT_NOFOLLOW`
+        const NOFOLLOW = linux_raw_sys::general::UMOUNT_NOFOLLOW;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(feature = "mount")]
+bitflags! {
+    /// `FSOPEN_*` constants for use with [`fsopen`].
+    ///
+    /// [`fsopen`]: crate::mount::fsopen
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct FsOpenFlags: c::c_uint {
+        /// `FSOPEN_CLOEXEC`
+        const FSOPEN_CLOEXEC = linux_raw_sys::general::FSOPEN_CLOEXEC;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(feature = "mount")]
+bitflags! {
+    /// `FSMOUNT_*` constants for use with [`fsmount`].
+    ///
+    /// [`fsmount`]: crate::mount::fsmount
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct FsMountFlags: c::c_uint {
+        /// `FSMOUNT_CLOEXEC`
+        const FSMOUNT_CLOEXEC = linux_raw_sys::general::FSMOUNT_CLOEXEC;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `FSCONFIG_*` constants for use with the `fsconfig` syscall.
+#[cfg(feature = "mount")]
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[repr(u32)]
+pub(crate) enum FsConfigCmd {
+    /// `FSCONFIG_SET_FLAG`
+    SetFlag = linux_raw_sys::general::fsconfig_command::FSCONFIG_SET_FLAG as u32,
+
+    /// `FSCONFIG_SET_STRING`
+    SetString = linux_raw_sys::general::fsconfig_command::FSCONFIG_SET_STRING as u32,
+
+    /// `FSCONFIG_SET_BINARY`
+    SetBinary = linux_raw_sys::general::fsconfig_command::FSCONFIG_SET_BINARY as u32,
+
+    /// `FSCONFIG_SET_PATH`
+    SetPath = linux_raw_sys::general::fsconfig_command::FSCONFIG_SET_PATH as u32,
+
+    /// `FSCONFIG_SET_PATH_EMPTY`
+    SetPathEmpty = linux_raw_sys::general::fsconfig_command::FSCONFIG_SET_PATH_EMPTY as u32,
+
+    /// `FSCONFIG_SET_FD`
+    SetFd = linux_raw_sys::general::fsconfig_command::FSCONFIG_SET_FD as u32,
+
+    /// `FSCONFIG_CMD_CREATE`
+    Create = linux_raw_sys::general::fsconfig_command::FSCONFIG_CMD_CREATE as u32,
+
+    /// `FSCONFIG_CMD_RECONFIGURE`
+    Reconfigure = linux_raw_sys::general::fsconfig_command::FSCONFIG_CMD_RECONFIGURE as u32,
+}
+
+#[cfg(feature = "mount")]
+bitflags! {
+    /// `MOUNT_ATTR_*` constants for use with [`fsmount`].
+    ///
+    /// [`fsmount`]: crate::mount::fsmount
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MountAttrFlags: c::c_uint {
+        /// `MOUNT_ATTR_RDONLY`
+        const MOUNT_ATTR_RDONLY = linux_raw_sys::general::MOUNT_ATTR_RDONLY;
+
+        /// `MOUNT_ATTR_NOSUID`
+        const MOUNT_ATTR_NOSUID = linux_raw_sys::general::MOUNT_ATTR_NOSUID;
+
+        /// `MOUNT_ATTR_NODEV`
+        const MOUNT_ATTR_NODEV = linux_raw_sys::general::MOUNT_ATTR_NODEV;
+
+        /// `MOUNT_ATTR_NOEXEC`
+        const MOUNT_ATTR_NOEXEC = linux_raw_sys::general::MOUNT_ATTR_NOEXEC;
+
+        /// `MOUNT_ATTR__ATIME`
+        const MOUNT_ATTR__ATIME = linux_raw_sys::general::MOUNT_ATTR__ATIME;
+
+        /// `MOUNT_ATTR_RELATIME`
+        const MOUNT_ATTR_RELATIME = linux_raw_sys::general::MOUNT_ATTR_RELATIME;
+
+        /// `MOUNT_ATTR_NOATIME`
+        const MOUNT_ATTR_NOATIME = linux_raw_sys::general::MOUNT_ATTR_NOATIME;
+
+        /// `MOUNT_ATTR_STRICTATIME`
+        const MOUNT_ATTR_STRICTATIME = linux_raw_sys::general::MOUNT_ATTR_STRICTATIME;
+
+        /// `MOUNT_ATTR_NODIRATIME`
+        const MOUNT_ATTR_NODIRATIME = linux_raw_sys::general::MOUNT_ATTR_NODIRATIME;
+
+        /// `MOUNT_ATTR_NOUSER`
+        const MOUNT_ATTR_IDMAP = linux_raw_sys::general::MOUNT_ATTR_IDMAP;
+
+        /// `MOUNT_ATTR__ATIME_FLAGS`
+        const MOUNT_ATTR_NOSYMFOLLOW = linux_raw_sys::general::MOUNT_ATTR_NOSYMFOLLOW;
+
+        /// `MOUNT_ATTR__ATIME_FLAGS`
+        const MOUNT_ATTR_SIZE_VER0 = linux_raw_sys::general::MOUNT_ATTR_SIZE_VER0;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(feature = "mount")]
+bitflags! {
+    /// `MOVE_MOUNT_*` constants for use with [`move_mount`].
+    ///
+    /// [`move_mount`]: crate::mount::move_mount
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MoveMountFlags: c::c_uint {
+        /// `MOVE_MOUNT_F_EMPTY_PATH`
+        const MOVE_MOUNT_F_SYMLINKS = linux_raw_sys::general::MOVE_MOUNT_F_SYMLINKS;
+
+        /// `MOVE_MOUNT_F_AUTOMOUNTS`
+        const MOVE_MOUNT_F_AUTOMOUNTS = linux_raw_sys::general::MOVE_MOUNT_F_AUTOMOUNTS;
+
+        /// `MOVE_MOUNT_F_EMPTY_PATH`
+        const MOVE_MOUNT_F_EMPTY_PATH = linux_raw_sys::general::MOVE_MOUNT_F_EMPTY_PATH;
+
+        /// `MOVE_MOUNT_T_SYMLINKS`
+        const MOVE_MOUNT_T_SYMLINKS = linux_raw_sys::general::MOVE_MOUNT_T_SYMLINKS;
+
+        /// `MOVE_MOUNT_T_AUTOMOUNTS`
+        const MOVE_MOUNT_T_AUTOMOUNTS = linux_raw_sys::general::MOVE_MOUNT_T_AUTOMOUNTS;
+
+        /// `MOVE_MOUNT_T_EMPTY_PATH`
+        const MOVE_MOUNT_T_EMPTY_PATH = linux_raw_sys::general::MOVE_MOUNT_T_EMPTY_PATH;
+
+        /// `MOVE_MOUNT__MASK`
+        const MOVE_MOUNT_SET_GROUP = linux_raw_sys::general::MOVE_MOUNT_SET_GROUP;
+
+        // TODO: add when Linux 6.5 is released
+        // /// `MOVE_MOUNT_BENEATH`
+        // const MOVE_MOUNT_BENEATH = linux_raw_sys::general::MOVE_MOUNT_BENEATH;
+
+        /// `MOVE_MOUNT__MASK`
+        const MOVE_MOUNT__MASK = linux_raw_sys::general::MOVE_MOUNT__MASK;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(feature = "mount")]
+bitflags! {
+    /// `OPENTREE_*` constants for use with [`open_tree`].
+    ///
+    /// [`open_tree`]: crate::mount::open_tree
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct OpenTreeFlags: c::c_uint {
+        /// `OPENTREE_CLONE`
+        const OPEN_TREE_CLONE = linux_raw_sys::general::OPEN_TREE_CLONE;
+
+        /// `OPENTREE_CLOEXEC`
+        const OPEN_TREE_CLOEXEC = linux_raw_sys::general::OPEN_TREE_CLOEXEC;
+
+        /// `AT_EMPTY_PATH`
+        const AT_EMPTY_PATH = linux_raw_sys::general::AT_EMPTY_PATH;
+
+        /// `AT_NO_AUTOMOUNT`
+        const AT_NO_AUTOMOUNT = linux_raw_sys::general::AT_NO_AUTOMOUNT;
+
+        /// `AT_RECURSIVE`
+        const AT_RECURSIVE = linux_raw_sys::general::AT_RECURSIVE;
+
+        /// `AT_SYMLINK_NOFOLLOW`
+        const AT_SYMLINK_NOFOLLOW = linux_raw_sys::general::AT_SYMLINK_NOFOLLOW;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(feature = "mount")]
+bitflags! {
+    /// `FSPICK_*` constants for use with [`fspick`].
+    ///
+    /// [`fspick`]: crate::mount::fspick
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct FsPickFlags: c::c_uint {
+        /// `FSPICK_CLOEXEC`
+        const FSPICK_CLOEXEC = linux_raw_sys::general::FSPICK_CLOEXEC;
+
+        /// `FSPICK_SYMLINK_NOFOLLOW`
+        const FSPICK_SYMLINK_NOFOLLOW = linux_raw_sys::general::FSPICK_SYMLINK_NOFOLLOW;
+
+        /// `FSPICK_NO_AUTOMOUNT`
+        const FSPICK_NO_AUTOMOUNT = linux_raw_sys::general::FSPICK_NO_AUTOMOUNT;
+
+        /// `FSPICK_EMPTY_PATH`
+        const FSPICK_EMPTY_PATH = linux_raw_sys::general::FSPICK_EMPTY_PATH;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `MS_*` constants for use with [`mount_change`].
+    ///
+    /// [`mount_change`]: crate::mount::mount_change
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MountPropagationFlags: c::c_uint {
+        /// `MS_SILENT`
+        const SILENT = linux_raw_sys::general::MS_SILENT;
+        /// `MS_SHARED`
+        const SHARED = linux_raw_sys::general::MS_SHARED;
+        /// `MS_PRIVATE`
+        const PRIVATE = linux_raw_sys::general::MS_PRIVATE;
+        /// `MS_SLAVE`
+        const SLAVE = linux_raw_sys::general::MS_SLAVE;
+        /// `MS_UNBINDABLE`
+        const UNBINDABLE = linux_raw_sys::general::MS_UNBINDABLE;
+        /// `MS_REC`
+        const REC = linux_raw_sys::general::MS_REC;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub(crate) struct InternalMountFlags: c::c_uint {
+        const REMOUNT = linux_raw_sys::general::MS_REMOUNT;
+        const MOVE = linux_raw_sys::general::MS_MOVE;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[repr(transparent)]
+pub(crate) struct MountFlagsArg(pub(crate) c::c_uint);
diff --git a/vendor/rustix/src/backend/linux_raw/net/addr.rs b/vendor/rustix/src/backend/linux_raw/net/addr.rs
new file mode 100644
index 0000000..85ba875
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/net/addr.rs
@@ -0,0 +1,178 @@
+//! Socket address utilities.
+//!
+//! # Safety
+//!
+//! This file uses `CStr::from_bytes_with_nul_unchecked` on a string it knows
+//! to be NUL-terminated.
+#![allow(unsafe_code)]
+
+use crate::backend::c;
+use crate::ffi::CStr;
+use crate::{io, path};
+use core::cmp::Ordering;
+use core::fmt;
+use core::hash::{Hash, Hasher};
+use core::slice;
+
+/// `struct sockaddr_un`
+#[derive(Clone)]
+#[doc(alias = "sockaddr_un")]
+pub struct SocketAddrUnix {
+    pub(crate) unix: c::sockaddr_un,
+    len: c::socklen_t,
+}
+
+impl SocketAddrUnix {
+    /// Construct a new Unix-domain address from a filesystem path.
+    #[inline]
+    pub fn new<P: path::Arg>(path: P) -> io::Result<Self> {
+        path.into_with_c_str(Self::_new)
+    }
+
+    #[inline]
+    fn _new(path: &CStr) -> io::Result<Self> {
+        let mut unix = Self::init();
+        let bytes = path.to_bytes_with_nul();
+        if bytes.len() > unix.sun_path.len() {
+            return Err(io::Errno::NAMETOOLONG);
+        }
+        for (i, b) in bytes.iter().enumerate() {
+            unix.sun_path[i] = *b as _;
+        }
+        let len = offsetof_sun_path() + bytes.len();
+        let len = len.try_into().unwrap();
+        Ok(Self { unix, len })
+    }
+
+    /// Construct a new abstract Unix-domain address from a byte slice.
+    #[inline]
+    pub fn new_abstract_name(name: &[u8]) -> io::Result<Self> {
+        let mut unix = Self::init();
+        let id = &mut unix.sun_path[1..];
+
+        // SAFETY: Convert `&mut [c_char]` to `&mut [u8]`.
+        let id = unsafe { slice::from_raw_parts_mut(id.as_mut_ptr().cast::<u8>(), id.len()) };
+
+        if let Some(id) = id.get_mut(..name.len()) {
+            id.copy_from_slice(name);
+            let len = offsetof_sun_path() + 1 + name.len();
+            let len = len.try_into().unwrap();
+            Ok(Self { unix, len })
+        } else {
+            Err(io::Errno::NAMETOOLONG)
+        }
+    }
+
+    const fn init() -> c::sockaddr_un {
+        c::sockaddr_un {
+            sun_family: c::AF_UNIX as _,
+            sun_path: [0; 108],
+        }
+    }
+
+    /// For a filesystem path address, return the path.
+    #[inline]
+    pub fn path(&self) -> Option<&CStr> {
+        let len = self.len();
+        if len != 0 && self.unix.sun_path[0] as u8 != b'\0' {
+            let end = len as usize - offsetof_sun_path();
+            let bytes = &self.unix.sun_path[..end];
+
+            // SAFETY: Convert `&[c_char]` to `&[u8]`.
+            let bytes = unsafe { slice::from_raw_parts(bytes.as_ptr().cast::<u8>(), bytes.len()) };
+
+            // SAFETY: `from_bytes_with_nul_unchecked` since the string is
+            // NUL-terminated.
+            unsafe { Some(CStr::from_bytes_with_nul_unchecked(bytes)) }
+        } else {
+            None
+        }
+    }
+
+    /// For an abstract address, return the identifier.
+    #[inline]
+    pub fn abstract_name(&self) -> Option<&[u8]> {
+        let len = self.len();
+        if len != 0 && self.unix.sun_path[0] as u8 == b'\0' {
+            let end = len as usize - offsetof_sun_path();
+            let bytes = &self.unix.sun_path[1..end];
+
+            // SAFETY: Convert `&[c_char]` to `&[u8]`.
+            let bytes = unsafe { slice::from_raw_parts(bytes.as_ptr().cast::<u8>(), bytes.len()) };
+
+            Some(bytes)
+        } else {
+            None
+        }
+    }
+
+    #[inline]
+    pub(crate) fn addr_len(&self) -> c::socklen_t {
+        self.len
+    }
+
+    #[inline]
+    pub(crate) fn len(&self) -> usize {
+        self.addr_len() as usize
+    }
+}
+
+impl PartialEq for SocketAddrUnix {
+    #[inline]
+    fn eq(&self, other: &Self) -> bool {
+        let self_len = self.len() - offsetof_sun_path();
+        let other_len = other.len() - offsetof_sun_path();
+        self.unix.sun_path[..self_len].eq(&other.unix.sun_path[..other_len])
+    }
+}
+
+impl Eq for SocketAddrUnix {}
+
+impl PartialOrd for SocketAddrUnix {
+    #[inline]
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl Ord for SocketAddrUnix {
+    #[inline]
+    fn cmp(&self, other: &Self) -> Ordering {
+        let self_len = self.len() - offsetof_sun_path();
+        let other_len = other.len() - offsetof_sun_path();
+        self.unix.sun_path[..self_len].cmp(&other.unix.sun_path[..other_len])
+    }
+}
+
+impl Hash for SocketAddrUnix {
+    #[inline]
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        let self_len = self.len() - offsetof_sun_path();
+        self.unix.sun_path[..self_len].hash(state)
+    }
+}
+
+impl fmt::Debug for SocketAddrUnix {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        if let Some(path) = self.path() {
+            path.fmt(fmt)
+        } else if let Some(name) = self.abstract_name() {
+            name.fmt(fmt)
+        } else {
+            "(unnamed)".fmt(fmt)
+        }
+    }
+}
+
+/// `struct sockaddr_storage` as a raw struct.
+pub type SocketAddrStorage = c::sockaddr;
+
+/// Return the offset of the `sun_path` field of `sockaddr_un`.
+#[inline]
+pub(crate) fn offsetof_sun_path() -> usize {
+    let z = c::sockaddr_un {
+        sun_family: 0_u16,
+        sun_path: [0; 108],
+    };
+    (crate::utils::as_ptr(&z.sun_path) as usize) - (crate::utils::as_ptr(&z) as usize)
+}
diff --git a/vendor/rustix/src/backend/linux_raw/net/mod.rs b/vendor/rustix/src/backend/linux_raw/net/mod.rs
new file mode 100644
index 0000000..f83c546
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/net/mod.rs
@@ -0,0 +1,7 @@
+pub(crate) mod addr;
+pub(crate) mod msghdr;
+pub(crate) mod read_sockaddr;
+pub(crate) mod send_recv;
+pub(crate) mod sockopt;
+pub(crate) mod syscalls;
+pub(crate) mod write_sockaddr;
diff --git a/vendor/rustix/src/backend/linux_raw/net/msghdr.rs b/vendor/rustix/src/backend/linux_raw/net/msghdr.rs
new file mode 100644
index 0000000..2b88bfb
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/net/msghdr.rs
@@ -0,0 +1,146 @@
+//! Utilities for dealing with message headers.
+//!
+//! These take closures rather than returning a `c::msghdr` directly because
+//! the message headers may reference stack-local data.
+
+#![allow(unsafe_code)]
+
+use crate::backend::c;
+use crate::backend::net::write_sockaddr::{encode_sockaddr_v4, encode_sockaddr_v6};
+
+use crate::io::{self, IoSlice, IoSliceMut};
+use crate::net::{RecvAncillaryBuffer, SendAncillaryBuffer, SocketAddrV4, SocketAddrV6};
+use crate::utils::as_ptr;
+
+use core::mem::{size_of, MaybeUninit};
+use core::ptr::null_mut;
+
+fn msg_iov_len(len: usize) -> c::size_t {
+    // This cast cannot overflow.
+    len as c::size_t
+}
+
+pub(crate) fn msg_control_len(len: usize) -> c::size_t {
+    // Same as above.
+    len as c::size_t
+}
+
+/// Create a message header intended to receive a datagram.
+pub(crate) fn with_recv_msghdr<R>(
+    name: &mut MaybeUninit<c::sockaddr_storage>,
+    iov: &mut [IoSliceMut<'_>],
+    control: &mut RecvAncillaryBuffer<'_>,
+    f: impl FnOnce(&mut c::msghdr) -> io::Result<R>,
+) -> io::Result<R> {
+    control.clear();
+
+    let namelen = size_of::<c::sockaddr_storage>() as c::c_int;
+    let mut msghdr = c::msghdr {
+        msg_name: name.as_mut_ptr().cast(),
+        msg_namelen: namelen,
+        msg_iov: iov.as_mut_ptr().cast(),
+        msg_iovlen: msg_iov_len(iov.len()),
+        msg_control: control.as_control_ptr().cast(),
+        msg_controllen: msg_control_len(control.control_len()),
+        msg_flags: 0,
+    };
+
+    let res = f(&mut msghdr);
+
+    // Reset the control length.
+    if res.is_ok() {
+        unsafe {
+            control.set_control_len(msghdr.msg_controllen.try_into().unwrap_or(usize::MAX));
+        }
+    }
+
+    res
+}
+
+/// Create a message header intended to send without an address.
+pub(crate) fn with_noaddr_msghdr<R>(
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    f: impl FnOnce(c::msghdr) -> R,
+) -> R {
+    f(c::msghdr {
+        msg_name: null_mut(),
+        msg_namelen: 0,
+        msg_iov: iov.as_ptr() as _,
+        msg_iovlen: msg_iov_len(iov.len()),
+        msg_control: control.as_control_ptr().cast(),
+        msg_controllen: msg_control_len(control.control_len()),
+        msg_flags: 0,
+    })
+}
+
+/// Create a message header intended to send with an IPv4 address.
+pub(crate) fn with_v4_msghdr<R>(
+    addr: &SocketAddrV4,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    f: impl FnOnce(c::msghdr) -> R,
+) -> R {
+    let encoded = encode_sockaddr_v4(addr);
+
+    f(c::msghdr {
+        msg_name: as_ptr(&encoded) as _,
+        msg_namelen: size_of::<SocketAddrV4>() as _,
+        msg_iov: iov.as_ptr() as _,
+        msg_iovlen: msg_iov_len(iov.len()),
+        msg_control: control.as_control_ptr().cast(),
+        msg_controllen: msg_control_len(control.control_len()),
+        msg_flags: 0,
+    })
+}
+
+/// Create a message header intended to send with an IPv6 address.
+pub(crate) fn with_v6_msghdr<R>(
+    addr: &SocketAddrV6,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    f: impl FnOnce(c::msghdr) -> R,
+) -> R {
+    let encoded = encode_sockaddr_v6(addr);
+
+    f(c::msghdr {
+        msg_name: as_ptr(&encoded) as _,
+        msg_namelen: size_of::<SocketAddrV6>() as _,
+        msg_iov: iov.as_ptr() as _,
+        msg_iovlen: msg_iov_len(iov.len()),
+        msg_control: control.as_control_ptr().cast(),
+        msg_controllen: msg_control_len(control.control_len()),
+        msg_flags: 0,
+    })
+}
+
+/// Create a message header intended to send with a Unix address.
+pub(crate) fn with_unix_msghdr<R>(
+    addr: &crate::net::SocketAddrUnix,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    f: impl FnOnce(c::msghdr) -> R,
+) -> R {
+    f(c::msghdr {
+        msg_name: as_ptr(&addr.unix) as _,
+        msg_namelen: addr.addr_len() as _,
+        msg_iov: iov.as_ptr() as _,
+        msg_iovlen: msg_iov_len(iov.len()),
+        msg_control: control.as_control_ptr().cast(),
+        msg_controllen: msg_control_len(control.control_len()),
+        msg_flags: 0,
+    })
+}
+
+/// Create a zero-initialized message header struct value.
+pub(crate) fn zero_msghdr() -> c::msghdr {
+    c::msghdr {
+        msg_name: null_mut(),
+        msg_namelen: 0,
+        msg_iov: null_mut(),
+        msg_iovlen: 0,
+        msg_control: null_mut(),
+        msg_controllen: 0,
+        msg_flags: 0,
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/net/read_sockaddr.rs b/vendor/rustix/src/backend/linux_raw/net/read_sockaddr.rs
new file mode 100644
index 0000000..5a91707
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/net/read_sockaddr.rs
@@ -0,0 +1,195 @@
+//! The BSD sockets API requires us to read the `ss_family` field before we can
+//! interpret the rest of a `sockaddr` produced by the kernel.
+#![allow(unsafe_code)]
+
+use crate::backend::c;
+use crate::io;
+use crate::net::{Ipv4Addr, Ipv6Addr, SocketAddrAny, SocketAddrUnix, SocketAddrV4, SocketAddrV6};
+use core::mem::size_of;
+use core::slice;
+
+// This must match the header of `sockaddr`.
+#[repr(C)]
+struct sockaddr_header {
+    ss_family: u16,
+}
+
+/// Read the `ss_family` field from a socket address returned from the OS.
+///
+/// # Safety
+///
+/// `storage` must point to a valid socket address returned from the OS.
+#[inline]
+unsafe fn read_ss_family(storage: *const c::sockaddr) -> u16 {
+    // Assert that we know the layout of `sockaddr`.
+    let _ = c::sockaddr {
+        __storage: c::sockaddr_storage {
+            __bindgen_anon_1: linux_raw_sys::net::__kernel_sockaddr_storage__bindgen_ty_1 {
+                __bindgen_anon_1:
+                    linux_raw_sys::net::__kernel_sockaddr_storage__bindgen_ty_1__bindgen_ty_1 {
+                        ss_family: 0_u16,
+                        __data: [0; 126_usize],
+                    },
+            },
+        },
+    };
+
+    (*storage.cast::<sockaddr_header>()).ss_family
+}
+
+/// Set the `ss_family` field of a socket address to `AF_UNSPEC`, so that we
+/// can test for `AF_UNSPEC` to test whether it was stored to.
+#[inline]
+pub(crate) unsafe fn initialize_family_to_unspec(storage: *mut c::sockaddr) {
+    (*storage.cast::<sockaddr_header>()).ss_family = c::AF_UNSPEC as _;
+}
+
+/// Read a socket address encoded in a platform-specific format.
+///
+/// # Safety
+///
+/// `storage` must point to valid socket address storage.
+pub(crate) unsafe fn read_sockaddr(
+    storage: *const c::sockaddr,
+    len: usize,
+) -> io::Result<SocketAddrAny> {
+    let offsetof_sun_path = super::addr::offsetof_sun_path();
+
+    if len < size_of::<c::sa_family_t>() {
+        return Err(io::Errno::INVAL);
+    }
+    match read_ss_family(storage).into() {
+        c::AF_INET => {
+            if len < size_of::<c::sockaddr_in>() {
+                return Err(io::Errno::INVAL);
+            }
+            let decode = &*storage.cast::<c::sockaddr_in>();
+            Ok(SocketAddrAny::V4(SocketAddrV4::new(
+                Ipv4Addr::from(u32::from_be(decode.sin_addr.s_addr)),
+                u16::from_be(decode.sin_port),
+            )))
+        }
+        c::AF_INET6 => {
+            if len < size_of::<c::sockaddr_in6>() {
+                return Err(io::Errno::INVAL);
+            }
+            let decode = &*storage.cast::<c::sockaddr_in6>();
+            Ok(SocketAddrAny::V6(SocketAddrV6::new(
+                Ipv6Addr::from(decode.sin6_addr.in6_u.u6_addr8),
+                u16::from_be(decode.sin6_port),
+                u32::from_be(decode.sin6_flowinfo),
+                decode.sin6_scope_id,
+            )))
+        }
+        c::AF_UNIX => {
+            if len < offsetof_sun_path {
+                return Err(io::Errno::INVAL);
+            }
+            if len == offsetof_sun_path {
+                Ok(SocketAddrAny::Unix(SocketAddrUnix::new(&[][..])?))
+            } else {
+                let decode = &*storage.cast::<c::sockaddr_un>();
+
+                // On Linux check for Linux's [abstract namespace].
+                //
+                // [abstract namespace]: https://man7.org/linux/man-pages/man7/unix.7.html
+                if decode.sun_path[0] == 0 {
+                    let bytes = &decode.sun_path[1..len - offsetof_sun_path];
+
+                    // SAFETY: Convert `&[c_char]` to `&[u8]`.
+                    let bytes = slice::from_raw_parts(bytes.as_ptr().cast::<u8>(), bytes.len());
+
+                    return SocketAddrUnix::new_abstract_name(bytes).map(SocketAddrAny::Unix);
+                }
+
+                // Otherwise we expect a NUL-terminated filesystem path.
+                let bytes = &decode.sun_path[..len - 1 - offsetof_sun_path];
+
+                // SAFETY: Convert `&[c_char]` to `&[u8]`.
+                let bytes = slice::from_raw_parts(bytes.as_ptr().cast::<u8>(), bytes.len());
+
+                assert_eq!(decode.sun_path[len - 1 - offsetof_sun_path], 0);
+                Ok(SocketAddrAny::Unix(SocketAddrUnix::new(bytes)?))
+            }
+        }
+        _ => Err(io::Errno::NOTSUP),
+    }
+}
+
+/// Read an optional socket address returned from the OS.
+///
+/// # Safety
+///
+/// `storage` must point to a valid socket address returned from the OS.
+pub(crate) unsafe fn maybe_read_sockaddr_os(
+    storage: *const c::sockaddr,
+    len: usize,
+) -> Option<SocketAddrAny> {
+    if len == 0 {
+        None
+    } else {
+        Some(read_sockaddr_os(storage, len))
+    }
+}
+
+/// Read a socket address returned from the OS.
+///
+/// # Safety
+///
+/// `storage` must point to a valid socket address returned from the OS.
+pub(crate) unsafe fn read_sockaddr_os(storage: *const c::sockaddr, len: usize) -> SocketAddrAny {
+    let offsetof_sun_path = super::addr::offsetof_sun_path();
+
+    assert!(len >= size_of::<c::sa_family_t>());
+    match read_ss_family(storage).into() {
+        c::AF_INET => {
+            assert!(len >= size_of::<c::sockaddr_in>());
+            let decode = &*storage.cast::<c::sockaddr_in>();
+            SocketAddrAny::V4(SocketAddrV4::new(
+                Ipv4Addr::from(u32::from_be(decode.sin_addr.s_addr)),
+                u16::from_be(decode.sin_port),
+            ))
+        }
+        c::AF_INET6 => {
+            assert!(len >= size_of::<c::sockaddr_in6>());
+            let decode = &*storage.cast::<c::sockaddr_in6>();
+            SocketAddrAny::V6(SocketAddrV6::new(
+                Ipv6Addr::from(decode.sin6_addr.in6_u.u6_addr8),
+                u16::from_be(decode.sin6_port),
+                u32::from_be(decode.sin6_flowinfo),
+                decode.sin6_scope_id,
+            ))
+        }
+        c::AF_UNIX => {
+            assert!(len >= offsetof_sun_path);
+            if len == offsetof_sun_path {
+                SocketAddrAny::Unix(SocketAddrUnix::new(&[][..]).unwrap())
+            } else {
+                let decode = &*storage.cast::<c::sockaddr_un>();
+
+                // On Linux check for Linux's [abstract namespace].
+                //
+                // [abstract namespace]: https://man7.org/linux/man-pages/man7/unix.7.html
+                if decode.sun_path[0] == 0 {
+                    let bytes = &decode.sun_path[1..len - offsetof_sun_path];
+
+                    // SAFETY: Convert `&[c_char]` to `&[u8]`.
+                    let bytes = slice::from_raw_parts(bytes.as_ptr().cast::<u8>(), bytes.len());
+
+                    return SocketAddrAny::Unix(SocketAddrUnix::new_abstract_name(bytes).unwrap());
+                }
+
+                // Otherwise we expect a NUL-terminated filesystem path.
+                assert_eq!(decode.sun_path[len - 1 - offsetof_sun_path], 0);
+
+                let bytes = &decode.sun_path[..len - 1 - offsetof_sun_path];
+
+                // SAFETY: Convert `&[c_char]` to `&[u8]`.
+                let bytes = slice::from_raw_parts(bytes.as_ptr().cast::<u8>(), bytes.len());
+
+                SocketAddrAny::Unix(SocketAddrUnix::new(bytes).unwrap())
+            }
+        }
+        other => unimplemented!("{:?}", other),
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/net/send_recv.rs b/vendor/rustix/src/backend/linux_raw/net/send_recv.rs
new file mode 100644
index 0000000..d5cdd07
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/net/send_recv.rs
@@ -0,0 +1,60 @@
+use crate::backend::c;
+use bitflags::bitflags;
+
+bitflags! {
+    /// `MSG_*` flags for use with [`send`], [`send_to`], and related
+    /// functions.
+    ///
+    /// [`send`]: crate::net::send
+    /// [`sendto`]: crate::net::sendto
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct SendFlags: u32 {
+        /// `MSG_CONFIRM`
+        const CONFIRM = c::MSG_CONFIRM;
+        /// `MSG_DONTROUTE`
+        const DONTROUTE = c::MSG_DONTROUTE;
+        /// `MSG_DONTWAIT`
+        const DONTWAIT = c::MSG_DONTWAIT;
+        /// `MSG_EOT`
+        const EOT = c::MSG_EOR;
+        /// `MSG_MORE`
+        const MORE = c::MSG_MORE;
+        /// `MSG_NOSIGNAL`
+        const NOSIGNAL = c::MSG_NOSIGNAL;
+        /// `MSG_OOB`
+        const OOB = c::MSG_OOB;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `MSG_*` flags for use with [`recv`], [`recvfrom`], and related
+    /// functions.
+    ///
+    /// [`recv`]: crate::net::recv
+    /// [`recvfrom`]: crate::net::recvfrom
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct RecvFlags: u32 {
+        /// `MSG_CMSG_CLOEXEC`
+        const CMSG_CLOEXEC = c::MSG_CMSG_CLOEXEC;
+        /// `MSG_DONTWAIT`
+        const DONTWAIT = c::MSG_DONTWAIT;
+        /// `MSG_ERRQUEUE`
+        const ERRQUEUE = c::MSG_ERRQUEUE;
+        /// `MSG_OOB`
+        const OOB = c::MSG_OOB;
+        /// `MSG_PEEK`
+        const PEEK = c::MSG_PEEK;
+        /// `MSG_TRUNC`
+        const TRUNC = c::MSG_TRUNC;
+        /// `MSG_WAITALL`
+        const WAITALL = c::MSG_WAITALL;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/net/sockopt.rs b/vendor/rustix/src/backend/linux_raw/net/sockopt.rs
new file mode 100644
index 0000000..6a740bb
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/net/sockopt.rs
@@ -0,0 +1,879 @@
+//! linux_raw syscalls supporting `rustix::net::sockopt`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::c;
+use crate::backend::conv::{by_mut, c_uint, ret, socklen_t};
+use crate::fd::BorrowedFd;
+#[cfg(feature = "alloc")]
+use crate::ffi::CStr;
+use crate::io;
+use crate::net::sockopt::Timeout;
+use crate::net::{
+    AddressFamily, Ipv4Addr, Ipv6Addr, Protocol, RawProtocol, SocketAddrAny, SocketAddrStorage,
+    SocketAddrV4, SocketAddrV6, SocketType, UCred,
+};
+#[cfg(feature = "alloc")]
+use alloc::borrow::ToOwned;
+#[cfg(feature = "alloc")]
+use alloc::string::String;
+use core::mem::MaybeUninit;
+use core::time::Duration;
+use linux_raw_sys::general::{__kernel_old_timeval, __kernel_sock_timeval};
+#[cfg(target_arch = "x86")]
+use {
+    crate::backend::conv::{slice_just_addr, x86_sys},
+    crate::backend::reg::{ArgReg, SocketArg},
+    linux_raw_sys::net::{SYS_GETSOCKOPT, SYS_SETSOCKOPT},
+};
+
+#[inline]
+fn getsockopt<T: Copy>(fd: BorrowedFd<'_>, level: u32, optname: u32) -> io::Result<T> {
+    let mut optlen: c::socklen_t = core::mem::size_of::<T>().try_into().unwrap();
+    debug_assert!(
+        optlen as usize >= core::mem::size_of::<c::c_int>(),
+        "Socket APIs don't ever use `bool` directly"
+    );
+
+    let mut value = MaybeUninit::<T>::uninit();
+    getsockopt_raw(fd, level, optname, &mut value, &mut optlen)?;
+
+    assert_eq!(
+        optlen as usize,
+        core::mem::size_of::<T>(),
+        "unexpected getsockopt size"
+    );
+
+    unsafe { Ok(value.assume_init()) }
+}
+
+#[inline]
+fn getsockopt_raw<T>(
+    fd: BorrowedFd<'_>,
+    level: u32,
+    optname: u32,
+    value: &mut MaybeUninit<T>,
+    optlen: &mut c::socklen_t,
+) -> io::Result<()> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret(syscall!(
+            __NR_getsockopt,
+            fd,
+            c_uint(level),
+            c_uint(optname),
+            value,
+            by_mut(optlen)
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret(syscall!(
+            __NR_socketcall,
+            x86_sys(SYS_GETSOCKOPT),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                c_uint(level),
+                c_uint(optname),
+                value.into(),
+                by_mut(optlen),
+            ])
+        ))
+    }
+}
+
+#[inline]
+fn setsockopt<T: Copy>(fd: BorrowedFd<'_>, level: u32, optname: u32, value: T) -> io::Result<()> {
+    let optlen = core::mem::size_of::<T>().try_into().unwrap();
+    debug_assert!(
+        optlen as usize >= core::mem::size_of::<c::c_int>(),
+        "Socket APIs don't ever use `bool` directly"
+    );
+    setsockopt_raw(fd, level, optname, &value, optlen)
+}
+
+#[inline]
+fn setsockopt_raw<T>(
+    fd: BorrowedFd<'_>,
+    level: u32,
+    optname: u32,
+    ptr: *const T,
+    optlen: c::socklen_t,
+) -> io::Result<()> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_setsockopt,
+            fd,
+            c_uint(level),
+            c_uint(optname),
+            ptr,
+            socklen_t(optlen)
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_SETSOCKOPT),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                c_uint(level),
+                c_uint(optname),
+                ptr.into(),
+                socklen_t(optlen),
+            ])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn get_socket_type(fd: BorrowedFd<'_>) -> io::Result<SocketType> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_TYPE)
+}
+
+#[inline]
+pub(crate) fn set_socket_reuseaddr(fd: BorrowedFd<'_>, reuseaddr: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_REUSEADDR, from_bool(reuseaddr))
+}
+
+#[inline]
+pub(crate) fn get_socket_reuseaddr(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_REUSEADDR).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_broadcast(fd: BorrowedFd<'_>, broadcast: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_BROADCAST, from_bool(broadcast))
+}
+
+#[inline]
+pub(crate) fn get_socket_broadcast(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_BROADCAST).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_linger(fd: BorrowedFd<'_>, linger: Option<Duration>) -> io::Result<()> {
+    // Convert `linger` to seconds, rounding up.
+    let l_linger = if let Some(linger) = linger {
+        duration_to_secs(linger)?
+    } else {
+        0
+    };
+    let linger = c::linger {
+        l_onoff: c::c_int::from(linger.is_some()),
+        l_linger,
+    };
+    setsockopt(fd, c::SOL_SOCKET, c::SO_LINGER, linger)
+}
+
+#[inline]
+pub(crate) fn get_socket_linger(fd: BorrowedFd<'_>) -> io::Result<Option<Duration>> {
+    let linger: c::linger = getsockopt(fd, c::SOL_SOCKET, c::SO_LINGER)?;
+    Ok((linger.l_onoff != 0).then(|| Duration::from_secs(linger.l_linger as u64)))
+}
+
+#[inline]
+pub(crate) fn set_socket_passcred(fd: BorrowedFd<'_>, passcred: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_PASSCRED, from_bool(passcred))
+}
+
+#[inline]
+pub(crate) fn get_socket_passcred(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_PASSCRED).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_timeout(
+    fd: BorrowedFd<'_>,
+    id: Timeout,
+    timeout: Option<Duration>,
+) -> io::Result<()> {
+    let time = duration_to_linux_sock_timeval(timeout)?;
+    let optname = match id {
+        Timeout::Recv => c::SO_RCVTIMEO_NEW,
+        Timeout::Send => c::SO_SNDTIMEO_NEW,
+    };
+    match setsockopt(fd, c::SOL_SOCKET, optname, time) {
+        Err(io::Errno::NOPROTOOPT) if c::SO_RCVTIMEO_NEW != c::SO_RCVTIMEO_OLD => {
+            set_socket_timeout_old(fd, id, timeout)
+        }
+        otherwise => otherwise,
+    }
+}
+
+/// Same as `set_socket_timeout` but uses `__kernel_old_timeval` instead of
+/// `__kernel_sock_timeval` and `_OLD` constants instead of `_NEW`.
+fn set_socket_timeout_old(
+    fd: BorrowedFd<'_>,
+    id: Timeout,
+    timeout: Option<Duration>,
+) -> io::Result<()> {
+    let time = duration_to_linux_old_timeval(timeout)?;
+    let optname = match id {
+        Timeout::Recv => c::SO_RCVTIMEO_OLD,
+        Timeout::Send => c::SO_SNDTIMEO_OLD,
+    };
+    setsockopt(fd, c::SOL_SOCKET, optname, time)
+}
+
+#[inline]
+pub(crate) fn get_socket_timeout(fd: BorrowedFd<'_>, id: Timeout) -> io::Result<Option<Duration>> {
+    let optname = match id {
+        Timeout::Recv => c::SO_RCVTIMEO_NEW,
+        Timeout::Send => c::SO_SNDTIMEO_NEW,
+    };
+    let time: __kernel_sock_timeval = match getsockopt(fd, c::SOL_SOCKET, optname) {
+        Err(io::Errno::NOPROTOOPT) if c::SO_RCVTIMEO_NEW != c::SO_RCVTIMEO_OLD => {
+            return get_socket_timeout_old(fd, id)
+        }
+        otherwise => otherwise?,
+    };
+    Ok(duration_from_linux_sock_timeval(time))
+}
+
+/// Same as `get_socket_timeout` but uses `__kernel_old_timeval` instead of
+/// `__kernel_sock_timeval` and `_OLD` constants instead of `_NEW`.
+fn get_socket_timeout_old(fd: BorrowedFd<'_>, id: Timeout) -> io::Result<Option<Duration>> {
+    let optname = match id {
+        Timeout::Recv => c::SO_RCVTIMEO_OLD,
+        Timeout::Send => c::SO_SNDTIMEO_OLD,
+    };
+    let time: __kernel_old_timeval = getsockopt(fd, c::SOL_SOCKET, optname)?;
+    Ok(duration_from_linux_old_timeval(time))
+}
+
+/// Convert a `__linux_sock_timeval` to a Rust `Option<Duration>`.
+#[inline]
+fn duration_from_linux_sock_timeval(time: __kernel_sock_timeval) -> Option<Duration> {
+    if time.tv_sec == 0 && time.tv_usec == 0 {
+        None
+    } else {
+        Some(Duration::from_secs(time.tv_sec as u64) + Duration::from_micros(time.tv_usec as u64))
+    }
+}
+
+/// Like `duration_from_linux` but uses Linux's old 32-bit
+/// `__kernel_old_timeval`.
+fn duration_from_linux_old_timeval(time: __kernel_old_timeval) -> Option<Duration> {
+    if time.tv_sec == 0 && time.tv_usec == 0 {
+        None
+    } else {
+        Some(Duration::from_secs(time.tv_sec as u64) + Duration::from_micros(time.tv_usec as u64))
+    }
+}
+
+/// Convert a Rust `Option<Duration>` to a `__kernel_sock_timeval`.
+#[inline]
+fn duration_to_linux_sock_timeval(timeout: Option<Duration>) -> io::Result<__kernel_sock_timeval> {
+    Ok(match timeout {
+        Some(timeout) => {
+            if timeout == Duration::ZERO {
+                return Err(io::Errno::INVAL);
+            }
+            // `subsec_micros` rounds down, so we use `subsec_nanos` and
+            // manually round up.
+            let mut timeout = __kernel_sock_timeval {
+                tv_sec: timeout.as_secs().try_into().unwrap_or(i64::MAX),
+                tv_usec: ((timeout.subsec_nanos() + 999) / 1000) as _,
+            };
+            if timeout.tv_sec == 0 && timeout.tv_usec == 0 {
+                timeout.tv_usec = 1;
+            }
+            timeout
+        }
+        None => __kernel_sock_timeval {
+            tv_sec: 0,
+            tv_usec: 0,
+        },
+    })
+}
+
+/// Like `duration_to_linux` but uses Linux's old 32-bit
+/// `__kernel_old_timeval`.
+fn duration_to_linux_old_timeval(timeout: Option<Duration>) -> io::Result<__kernel_old_timeval> {
+    Ok(match timeout {
+        Some(timeout) => {
+            if timeout == Duration::ZERO {
+                return Err(io::Errno::INVAL);
+            }
+
+            // `subsec_micros` rounds down, so we use `subsec_nanos` and
+            // manually round up.
+            let mut timeout = __kernel_old_timeval {
+                tv_sec: timeout.as_secs().try_into().unwrap_or(c::c_long::MAX),
+                tv_usec: ((timeout.subsec_nanos() + 999) / 1000) as _,
+            };
+            if timeout.tv_sec == 0 && timeout.tv_usec == 0 {
+                timeout.tv_usec = 1;
+            }
+            timeout
+        }
+        None => __kernel_old_timeval {
+            tv_sec: 0,
+            tv_usec: 0,
+        },
+    })
+}
+
+#[inline]
+pub(crate) fn get_socket_error(fd: BorrowedFd<'_>) -> io::Result<Result<(), io::Errno>> {
+    let err: c::c_int = getsockopt(fd, c::SOL_SOCKET, c::SO_ERROR)?;
+    Ok(if err == 0 {
+        Ok(())
+    } else {
+        Err(io::Errno::from_raw_os_error(err))
+    })
+}
+
+#[inline]
+pub(crate) fn set_socket_keepalive(fd: BorrowedFd<'_>, keepalive: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_KEEPALIVE, from_bool(keepalive))
+}
+
+#[inline]
+pub(crate) fn get_socket_keepalive(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_KEEPALIVE).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_recv_buffer_size(fd: BorrowedFd<'_>, size: usize) -> io::Result<()> {
+    let size: c::c_int = size.try_into().map_err(|_| io::Errno::INVAL)?;
+    setsockopt(fd, c::SOL_SOCKET, c::SO_RCVBUF, size)
+}
+
+#[inline]
+pub(crate) fn get_socket_recv_buffer_size(fd: BorrowedFd<'_>) -> io::Result<usize> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_RCVBUF).map(|size: u32| size as usize)
+}
+
+#[inline]
+pub(crate) fn set_socket_send_buffer_size(fd: BorrowedFd<'_>, size: usize) -> io::Result<()> {
+    let size: c::c_int = size.try_into().map_err(|_| io::Errno::INVAL)?;
+    setsockopt(fd, c::SOL_SOCKET, c::SO_SNDBUF, size)
+}
+
+#[inline]
+pub(crate) fn get_socket_send_buffer_size(fd: BorrowedFd<'_>) -> io::Result<usize> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_SNDBUF).map(|size: u32| size as usize)
+}
+
+#[inline]
+pub(crate) fn get_socket_domain(fd: BorrowedFd<'_>) -> io::Result<AddressFamily> {
+    let domain: c::c_int = getsockopt(fd, c::SOL_SOCKET, c::SO_DOMAIN)?;
+    Ok(AddressFamily(
+        domain.try_into().map_err(|_| io::Errno::OPNOTSUPP)?,
+    ))
+}
+
+#[inline]
+pub(crate) fn get_socket_acceptconn(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_ACCEPTCONN).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_oobinline(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_OOBINLINE, from_bool(value))
+}
+
+#[inline]
+pub(crate) fn get_socket_oobinline(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_OOBINLINE).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_reuseport(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_REUSEPORT, from_bool(value))
+}
+
+#[inline]
+pub(crate) fn get_socket_reuseport(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_REUSEPORT).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn get_socket_protocol(fd: BorrowedFd<'_>) -> io::Result<Option<Protocol>> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_PROTOCOL)
+        .map(|raw: u32| RawProtocol::new(raw).map(Protocol::from_raw))
+}
+
+#[inline]
+pub(crate) fn get_socket_cookie(fd: BorrowedFd<'_>) -> io::Result<u64> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_COOKIE)
+}
+
+#[inline]
+pub(crate) fn get_socket_incoming_cpu(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_INCOMING_CPU)
+}
+
+#[inline]
+pub(crate) fn set_socket_incoming_cpu(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_INCOMING_CPU, value)
+}
+
+#[inline]
+pub(crate) fn set_ip_ttl(fd: BorrowedFd<'_>, ttl: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_TTL, ttl)
+}
+
+#[inline]
+pub(crate) fn get_ip_ttl(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_TTL)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_v6only(fd: BorrowedFd<'_>, only_v6: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_V6ONLY, from_bool(only_v6))
+}
+
+#[inline]
+pub(crate) fn get_ipv6_v6only(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_V6ONLY).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_ip_multicast_loop(fd: BorrowedFd<'_>, multicast_loop: bool) -> io::Result<()> {
+    setsockopt(
+        fd,
+        c::IPPROTO_IP,
+        c::IP_MULTICAST_LOOP,
+        from_bool(multicast_loop),
+    )
+}
+
+#[inline]
+pub(crate) fn get_ip_multicast_loop(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_MULTICAST_LOOP).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_ip_multicast_ttl(fd: BorrowedFd<'_>, multicast_ttl: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_MULTICAST_TTL, multicast_ttl)
+}
+
+#[inline]
+pub(crate) fn get_ip_multicast_ttl(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_MULTICAST_TTL)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_multicast_loop(fd: BorrowedFd<'_>, multicast_loop: bool) -> io::Result<()> {
+    setsockopt(
+        fd,
+        c::IPPROTO_IPV6,
+        c::IPV6_MULTICAST_LOOP,
+        from_bool(multicast_loop),
+    )
+}
+
+#[inline]
+pub(crate) fn get_ipv6_multicast_loop(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_MULTICAST_LOOP).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_multicast_hops(fd: BorrowedFd<'_>, multicast_hops: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IPV6_MULTICAST_HOPS, multicast_hops)
+}
+
+#[inline]
+pub(crate) fn get_ipv6_multicast_hops(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IP, c::IPV6_MULTICAST_HOPS)
+}
+
+#[inline]
+pub(crate) fn set_ip_add_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+) -> io::Result<()> {
+    let mreq = to_ip_mreq(multiaddr, interface);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_ADD_MEMBERSHIP, mreq)
+}
+
+#[inline]
+pub(crate) fn set_ip_add_membership_with_ifindex(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    address: &Ipv4Addr,
+    ifindex: i32,
+) -> io::Result<()> {
+    let mreqn = to_ip_mreqn(multiaddr, address, ifindex);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_ADD_MEMBERSHIP, mreqn)
+}
+
+#[inline]
+pub(crate) fn set_ip_add_source_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+    sourceaddr: &Ipv4Addr,
+) -> io::Result<()> {
+    let mreq_source = to_imr_source(multiaddr, interface, sourceaddr);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_ADD_SOURCE_MEMBERSHIP, mreq_source)
+}
+
+#[inline]
+pub(crate) fn set_ip_drop_source_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+    sourceaddr: &Ipv4Addr,
+) -> io::Result<()> {
+    let mreq_source = to_imr_source(multiaddr, interface, sourceaddr);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_DROP_SOURCE_MEMBERSHIP, mreq_source)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_add_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv6Addr,
+    interface: u32,
+) -> io::Result<()> {
+    let mreq = to_ipv6mr(multiaddr, interface);
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_ADD_MEMBERSHIP, mreq)
+}
+
+#[inline]
+pub(crate) fn set_ip_drop_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+) -> io::Result<()> {
+    let mreq = to_ip_mreq(multiaddr, interface);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_DROP_MEMBERSHIP, mreq)
+}
+
+#[inline]
+pub(crate) fn set_ip_drop_membership_with_ifindex(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    address: &Ipv4Addr,
+    ifindex: i32,
+) -> io::Result<()> {
+    let mreqn = to_ip_mreqn(multiaddr, address, ifindex);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_DROP_MEMBERSHIP, mreqn)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_drop_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv6Addr,
+    interface: u32,
+) -> io::Result<()> {
+    let mreq = to_ipv6mr(multiaddr, interface);
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_DROP_MEMBERSHIP, mreq)
+}
+
+#[inline]
+pub(crate) fn get_ipv6_unicast_hops(fd: BorrowedFd<'_>) -> io::Result<u8> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_UNICAST_HOPS).map(|hops: c::c_int| hops as u8)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_unicast_hops(fd: BorrowedFd<'_>, hops: Option<u8>) -> io::Result<()> {
+    let hops = match hops {
+        Some(hops) => hops.into(),
+        None => -1,
+    };
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_UNICAST_HOPS, hops)
+}
+
+#[inline]
+pub(crate) fn set_ip_tos(fd: BorrowedFd<'_>, value: u8) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_TOS, i32::from(value))
+}
+
+#[inline]
+pub(crate) fn get_ip_tos(fd: BorrowedFd<'_>) -> io::Result<u8> {
+    let value: i32 = getsockopt(fd, c::IPPROTO_IP, c::IP_TOS)?;
+    Ok(value as u8)
+}
+
+#[inline]
+pub(crate) fn set_ip_recvtos(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_RECVTOS, from_bool(value))
+}
+
+#[inline]
+pub(crate) fn get_ip_recvtos(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_RECVTOS).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_recvtclass(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_RECVTCLASS, from_bool(value))
+}
+
+#[inline]
+pub(crate) fn get_ipv6_recvtclass(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_RECVTCLASS).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_ip_freebind(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_FREEBIND, from_bool(value))
+}
+
+#[inline]
+pub(crate) fn get_ip_freebind(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_FREEBIND).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_freebind(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_FREEBIND, from_bool(value))
+}
+
+#[inline]
+pub(crate) fn get_ipv6_freebind(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_FREEBIND).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn get_ip_original_dst(fd: BorrowedFd<'_>) -> io::Result<SocketAddrV4> {
+    let level = c::IPPROTO_IP;
+    let optname = c::SO_ORIGINAL_DST;
+    let mut value = MaybeUninit::<SocketAddrStorage>::uninit();
+    let mut optlen = core::mem::size_of_val(&value).try_into().unwrap();
+
+    getsockopt_raw(fd, level, optname, &mut value, &mut optlen)?;
+
+    let any = unsafe { SocketAddrAny::read(value.as_ptr(), optlen as usize)? };
+    match any {
+        SocketAddrAny::V4(v4) => Ok(v4),
+        _ => unreachable!(),
+    }
+}
+
+#[inline]
+pub(crate) fn get_ipv6_original_dst(fd: BorrowedFd<'_>) -> io::Result<SocketAddrV6> {
+    let level = c::IPPROTO_IPV6;
+    let optname = c::IP6T_SO_ORIGINAL_DST;
+    let mut value = MaybeUninit::<SocketAddrStorage>::uninit();
+    let mut optlen = core::mem::size_of_val(&value).try_into().unwrap();
+
+    getsockopt_raw(fd, level, optname, &mut value, &mut optlen)?;
+
+    let any = unsafe { SocketAddrAny::read(value.as_ptr(), optlen as usize)? };
+    match any {
+        SocketAddrAny::V6(v6) => Ok(v6),
+        _ => unreachable!(),
+    }
+}
+
+#[inline]
+pub(crate) fn set_ipv6_tclass(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_TCLASS, value)
+}
+
+#[inline]
+pub(crate) fn get_ipv6_tclass(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_TCLASS)
+}
+
+#[inline]
+pub(crate) fn set_tcp_nodelay(fd: BorrowedFd<'_>, nodelay: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_NODELAY, from_bool(nodelay))
+}
+
+#[inline]
+pub(crate) fn get_tcp_nodelay(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_NODELAY).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_tcp_keepcnt(fd: BorrowedFd<'_>, count: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_KEEPCNT, count)
+}
+
+#[inline]
+pub(crate) fn get_tcp_keepcnt(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_KEEPCNT)
+}
+
+#[inline]
+pub(crate) fn set_tcp_keepidle(fd: BorrowedFd<'_>, duration: Duration) -> io::Result<()> {
+    let secs: c::c_uint = duration_to_secs(duration)?;
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_KEEPIDLE, secs)
+}
+
+#[inline]
+pub(crate) fn get_tcp_keepidle(fd: BorrowedFd<'_>) -> io::Result<Duration> {
+    let secs: c::c_uint = getsockopt(fd, c::IPPROTO_TCP, c::TCP_KEEPIDLE)?;
+    Ok(Duration::from_secs(secs as u64))
+}
+
+#[inline]
+pub(crate) fn set_tcp_keepintvl(fd: BorrowedFd<'_>, duration: Duration) -> io::Result<()> {
+    let secs: c::c_uint = duration_to_secs(duration)?;
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_KEEPINTVL, secs)
+}
+
+#[inline]
+pub(crate) fn get_tcp_keepintvl(fd: BorrowedFd<'_>) -> io::Result<Duration> {
+    let secs: c::c_uint = getsockopt(fd, c::IPPROTO_TCP, c::TCP_KEEPINTVL)?;
+    Ok(Duration::from_secs(secs as u64))
+}
+
+#[inline]
+pub(crate) fn set_tcp_user_timeout(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_USER_TIMEOUT, value)
+}
+
+#[inline]
+pub(crate) fn get_tcp_user_timeout(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_USER_TIMEOUT)
+}
+
+#[inline]
+pub(crate) fn set_tcp_quickack(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_QUICKACK, from_bool(value))
+}
+
+#[inline]
+pub(crate) fn get_tcp_quickack(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_QUICKACK).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_tcp_congestion(fd: BorrowedFd<'_>, value: &str) -> io::Result<()> {
+    let level = c::IPPROTO_TCP;
+    let optname = c::TCP_CONGESTION;
+    let optlen = value.len().try_into().unwrap();
+    setsockopt_raw(fd, level, optname, value.as_ptr(), optlen)
+}
+
+#[cfg(feature = "alloc")]
+#[inline]
+pub(crate) fn get_tcp_congestion(fd: BorrowedFd<'_>) -> io::Result<String> {
+    let level = c::IPPROTO_TCP;
+    let optname = c::TCP_CONGESTION;
+    const OPTLEN: c::socklen_t = 16;
+    let mut value = MaybeUninit::<[MaybeUninit<u8>; OPTLEN as usize]>::uninit();
+    let mut optlen = OPTLEN;
+    getsockopt_raw(fd, level, optname, &mut value, &mut optlen)?;
+    unsafe {
+        let value = value.assume_init();
+        let slice: &[u8] = core::mem::transmute(&value[..optlen as usize]);
+        assert!(slice.iter().any(|b| *b == b'\0'));
+        Ok(
+            core::str::from_utf8(CStr::from_ptr(slice.as_ptr().cast()).to_bytes())
+                .unwrap()
+                .to_owned(),
+        )
+    }
+}
+
+#[inline]
+pub(crate) fn set_tcp_thin_linear_timeouts(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(
+        fd,
+        c::IPPROTO_TCP,
+        c::TCP_THIN_LINEAR_TIMEOUTS,
+        from_bool(value),
+    )
+}
+
+#[inline]
+pub(crate) fn get_tcp_thin_linear_timeouts(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_THIN_LINEAR_TIMEOUTS).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_tcp_cork(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_CORK, from_bool(value))
+}
+
+#[inline]
+pub(crate) fn get_tcp_cork(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_CORK).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn get_socket_peercred(fd: BorrowedFd<'_>) -> io::Result<UCred> {
+    getsockopt(fd, c::SOL_SOCKET, linux_raw_sys::net::SO_PEERCRED)
+}
+
+#[inline]
+fn to_ip_mreq(multiaddr: &Ipv4Addr, interface: &Ipv4Addr) -> c::ip_mreq {
+    c::ip_mreq {
+        imr_multiaddr: to_imr_addr(multiaddr),
+        imr_interface: to_imr_addr(interface),
+    }
+}
+
+#[inline]
+fn to_ip_mreqn(multiaddr: &Ipv4Addr, address: &Ipv4Addr, ifindex: i32) -> c::ip_mreqn {
+    c::ip_mreqn {
+        imr_multiaddr: to_imr_addr(multiaddr),
+        imr_address: to_imr_addr(address),
+        imr_ifindex: ifindex,
+    }
+}
+
+#[inline]
+fn to_imr_source(
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+    sourceaddr: &Ipv4Addr,
+) -> c::ip_mreq_source {
+    c::ip_mreq_source {
+        imr_multiaddr: to_imr_addr(multiaddr).s_addr,
+        imr_interface: to_imr_addr(interface).s_addr,
+        imr_sourceaddr: to_imr_addr(sourceaddr).s_addr,
+    }
+}
+
+#[inline]
+fn to_imr_addr(addr: &Ipv4Addr) -> c::in_addr {
+    c::in_addr {
+        s_addr: u32::from_ne_bytes(addr.octets()),
+    }
+}
+
+#[inline]
+fn to_ipv6mr(multiaddr: &Ipv6Addr, interface: u32) -> c::ipv6_mreq {
+    c::ipv6_mreq {
+        ipv6mr_multiaddr: to_ipv6mr_multiaddr(multiaddr),
+        ipv6mr_ifindex: to_ipv6mr_interface(interface),
+    }
+}
+
+#[inline]
+fn to_ipv6mr_multiaddr(multiaddr: &Ipv6Addr) -> c::in6_addr {
+    c::in6_addr {
+        in6_u: linux_raw_sys::net::in6_addr__bindgen_ty_1 {
+            u6_addr8: multiaddr.octets(),
+        },
+    }
+}
+
+#[inline]
+fn to_ipv6mr_interface(interface: u32) -> c::c_int {
+    interface as c::c_int
+}
+
+#[inline]
+fn from_bool(value: bool) -> c::c_uint {
+    c::c_uint::from(value)
+}
+
+#[inline]
+fn to_bool(value: c::c_uint) -> bool {
+    value != 0
+}
+
+/// Convert to seconds, rounding up if necessary.
+#[inline]
+fn duration_to_secs<T: TryFrom<u64>>(duration: Duration) -> io::Result<T> {
+    let mut secs = duration.as_secs();
+    if duration.subsec_nanos() != 0 {
+        secs = secs.checked_add(1).ok_or(io::Errno::INVAL)?;
+    }
+    T::try_from(secs).map_err(|_e| io::Errno::INVAL)
+}
diff --git a/vendor/rustix/src/backend/linux_raw/net/syscalls.rs b/vendor/rustix/src/backend/linux_raw/net/syscalls.rs
new file mode 100644
index 0000000..726f022
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/net/syscalls.rs
@@ -0,0 +1,949 @@
+//! linux_raw syscalls supporting `rustix::net`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use super::msghdr::{
+    with_noaddr_msghdr, with_recv_msghdr, with_unix_msghdr, with_v4_msghdr, with_v6_msghdr,
+};
+use super::read_sockaddr::{initialize_family_to_unspec, maybe_read_sockaddr_os, read_sockaddr_os};
+use super::send_recv::{RecvFlags, SendFlags};
+use super::write_sockaddr::{encode_sockaddr_v4, encode_sockaddr_v6};
+use crate::backend::c;
+use crate::backend::conv::{
+    by_mut, by_ref, c_int, c_uint, pass_usize, ret, ret_owned_fd, ret_usize, size_of, slice,
+    socklen_t, zero,
+};
+use crate::fd::{BorrowedFd, OwnedFd};
+use crate::io::{self, IoSlice, IoSliceMut};
+use crate::net::{
+    AddressFamily, Protocol, RecvAncillaryBuffer, RecvMsgReturn, SendAncillaryBuffer, Shutdown,
+    SocketAddrAny, SocketAddrUnix, SocketAddrV4, SocketAddrV6, SocketFlags, SocketType,
+};
+use c::{sockaddr, sockaddr_in, sockaddr_in6, socklen_t};
+use core::mem::MaybeUninit;
+#[cfg(target_arch = "x86")]
+use {
+    crate::backend::conv::{slice_just_addr, x86_sys},
+    crate::backend::reg::{ArgReg, SocketArg},
+    linux_raw_sys::net::{
+        SYS_ACCEPT, SYS_ACCEPT4, SYS_BIND, SYS_CONNECT, SYS_GETPEERNAME, SYS_GETSOCKNAME,
+        SYS_LISTEN, SYS_RECV, SYS_RECVFROM, SYS_RECVMSG, SYS_SEND, SYS_SENDMSG, SYS_SENDTO,
+        SYS_SHUTDOWN, SYS_SOCKET, SYS_SOCKETPAIR,
+    },
+};
+
+#[inline]
+pub(crate) fn socket(
+    family: AddressFamily,
+    type_: SocketType,
+    protocol: Option<Protocol>,
+) -> io::Result<OwnedFd> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret_owned_fd(syscall_readonly!(__NR_socket, family, type_, protocol))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret_owned_fd(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_SOCKET),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                family.into(),
+                type_.into(),
+                protocol.into(),
+            ])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn socket_with(
+    family: AddressFamily,
+    type_: SocketType,
+    flags: SocketFlags,
+    protocol: Option<Protocol>,
+) -> io::Result<OwnedFd> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret_owned_fd(syscall_readonly!(
+            __NR_socket,
+            family,
+            (type_, flags),
+            protocol
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret_owned_fd(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_SOCKET),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                family.into(),
+                (type_, flags).into(),
+                protocol.into(),
+            ])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn socketpair(
+    family: AddressFamily,
+    type_: SocketType,
+    flags: SocketFlags,
+    protocol: Option<Protocol>,
+) -> io::Result<(OwnedFd, OwnedFd)> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        let mut result = MaybeUninit::<[OwnedFd; 2]>::uninit();
+        ret(syscall!(
+            __NR_socketpair,
+            family,
+            (type_, flags),
+            protocol,
+            &mut result
+        ))?;
+        let [fd0, fd1] = result.assume_init();
+        Ok((fd0, fd1))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        let mut result = MaybeUninit::<[OwnedFd; 2]>::uninit();
+        ret(syscall!(
+            __NR_socketcall,
+            x86_sys(SYS_SOCKETPAIR),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                family.into(),
+                (type_, flags).into(),
+                protocol.into(),
+                (&mut result).into(),
+            ])
+        ))?;
+        let [fd0, fd1] = result.assume_init();
+        Ok((fd0, fd1))
+    }
+}
+
+#[inline]
+pub(crate) fn accept(fd: BorrowedFd<'_>) -> io::Result<OwnedFd> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        let fd = ret_owned_fd(syscall_readonly!(__NR_accept, fd, zero(), zero()))?;
+        Ok(fd)
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        let fd = ret_owned_fd(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_ACCEPT),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[fd.into(), zero(), zero()])
+        ))?;
+        Ok(fd)
+    }
+}
+
+#[inline]
+pub(crate) fn accept_with(fd: BorrowedFd<'_>, flags: SocketFlags) -> io::Result<OwnedFd> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        let fd = ret_owned_fd(syscall_readonly!(__NR_accept4, fd, zero(), zero(), flags))?;
+        Ok(fd)
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        let fd = ret_owned_fd(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_ACCEPT4),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[fd.into(), zero(), zero(), flags.into()])
+        ))?;
+        Ok(fd)
+    }
+}
+
+#[inline]
+pub(crate) fn acceptfrom(fd: BorrowedFd<'_>) -> io::Result<(OwnedFd, Option<SocketAddrAny>)> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        let mut addrlen = core::mem::size_of::<sockaddr>() as socklen_t;
+        let mut storage = MaybeUninit::<sockaddr>::uninit();
+        let fd = ret_owned_fd(syscall!(
+            __NR_accept,
+            fd,
+            &mut storage,
+            by_mut(&mut addrlen)
+        ))?;
+        Ok((
+            fd,
+            maybe_read_sockaddr_os(&storage.assume_init(), addrlen.try_into().unwrap()),
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        let mut addrlen = core::mem::size_of::<sockaddr>() as socklen_t;
+        let mut storage = MaybeUninit::<sockaddr>::uninit();
+        let fd = ret_owned_fd(syscall!(
+            __NR_socketcall,
+            x86_sys(SYS_ACCEPT),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                (&mut storage).into(),
+                by_mut(&mut addrlen),
+            ])
+        ))?;
+        Ok((
+            fd,
+            maybe_read_sockaddr_os(&storage.assume_init(), addrlen.try_into().unwrap()),
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn acceptfrom_with(
+    fd: BorrowedFd<'_>,
+    flags: SocketFlags,
+) -> io::Result<(OwnedFd, Option<SocketAddrAny>)> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        let mut addrlen = core::mem::size_of::<sockaddr>() as socklen_t;
+        let mut storage = MaybeUninit::<sockaddr>::uninit();
+        let fd = ret_owned_fd(syscall!(
+            __NR_accept4,
+            fd,
+            &mut storage,
+            by_mut(&mut addrlen),
+            flags
+        ))?;
+        Ok((
+            fd,
+            maybe_read_sockaddr_os(&storage.assume_init(), addrlen.try_into().unwrap()),
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        let mut addrlen = core::mem::size_of::<sockaddr>() as socklen_t;
+        let mut storage = MaybeUninit::<sockaddr>::uninit();
+        let fd = ret_owned_fd(syscall!(
+            __NR_socketcall,
+            x86_sys(SYS_ACCEPT4),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                (&mut storage).into(),
+                by_mut(&mut addrlen),
+                flags.into(),
+            ])
+        ))?;
+        Ok((
+            fd,
+            maybe_read_sockaddr_os(&storage.assume_init(), addrlen.try_into().unwrap()),
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn recvmsg(
+    sockfd: BorrowedFd<'_>,
+    iov: &mut [IoSliceMut<'_>],
+    control: &mut RecvAncillaryBuffer<'_>,
+    msg_flags: RecvFlags,
+) -> io::Result<RecvMsgReturn> {
+    let mut storage = MaybeUninit::<c::sockaddr_storage>::uninit();
+
+    with_recv_msghdr(&mut storage, iov, control, |msghdr| {
+        #[cfg(not(target_arch = "x86"))]
+        let result =
+            unsafe { ret_usize(syscall!(__NR_recvmsg, sockfd, by_mut(msghdr), msg_flags)) };
+
+        #[cfg(target_arch = "x86")]
+        let result = unsafe {
+            ret_usize(syscall!(
+                __NR_socketcall,
+                x86_sys(SYS_RECVMSG),
+                slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                    sockfd.into(),
+                    by_mut(msghdr),
+                    msg_flags.into(),
+                ])
+            ))
+        };
+
+        result.map(|bytes| {
+            // Get the address of the sender, if any.
+            let addr =
+                unsafe { maybe_read_sockaddr_os(msghdr.msg_name as _, msghdr.msg_namelen as _) };
+
+            RecvMsgReturn {
+                bytes,
+                address: addr,
+                flags: RecvFlags::from_bits_retain(msghdr.msg_flags),
+            }
+        })
+    })
+}
+
+#[inline]
+pub(crate) fn sendmsg(
+    sockfd: BorrowedFd<'_>,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    msg_flags: SendFlags,
+) -> io::Result<usize> {
+    with_noaddr_msghdr(iov, control, |msghdr| {
+        #[cfg(not(target_arch = "x86"))]
+        let result =
+            unsafe { ret_usize(syscall!(__NR_sendmsg, sockfd, by_ref(&msghdr), msg_flags)) };
+
+        #[cfg(target_arch = "x86")]
+        let result = unsafe {
+            ret_usize(syscall!(
+                __NR_socketcall,
+                x86_sys(SYS_SENDMSG),
+                slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                    sockfd.into(),
+                    by_ref(&msghdr),
+                    msg_flags.into()
+                ])
+            ))
+        };
+
+        result
+    })
+}
+
+#[inline]
+pub(crate) fn sendmsg_v4(
+    sockfd: BorrowedFd<'_>,
+    addr: &SocketAddrV4,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    msg_flags: SendFlags,
+) -> io::Result<usize> {
+    with_v4_msghdr(addr, iov, control, |msghdr| {
+        #[cfg(not(target_arch = "x86"))]
+        let result =
+            unsafe { ret_usize(syscall!(__NR_sendmsg, sockfd, by_ref(&msghdr), msg_flags)) };
+
+        #[cfg(target_arch = "x86")]
+        let result = unsafe {
+            ret_usize(syscall!(
+                __NR_socketcall,
+                x86_sys(SYS_SENDMSG),
+                slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                    sockfd.into(),
+                    by_ref(&msghdr),
+                    msg_flags.into(),
+                ])
+            ))
+        };
+
+        result
+    })
+}
+
+#[inline]
+pub(crate) fn sendmsg_v6(
+    sockfd: BorrowedFd<'_>,
+    addr: &SocketAddrV6,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    msg_flags: SendFlags,
+) -> io::Result<usize> {
+    with_v6_msghdr(addr, iov, control, |msghdr| {
+        #[cfg(not(target_arch = "x86"))]
+        let result =
+            unsafe { ret_usize(syscall!(__NR_sendmsg, sockfd, by_ref(&msghdr), msg_flags)) };
+
+        #[cfg(target_arch = "x86")]
+        let result = unsafe {
+            ret_usize(syscall!(
+                __NR_socketcall,
+                x86_sys(SYS_SENDMSG),
+                slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                    sockfd.into(),
+                    by_ref(&msghdr),
+                    msg_flags.into()
+                ])
+            ))
+        };
+
+        result
+    })
+}
+
+#[inline]
+pub(crate) fn sendmsg_unix(
+    sockfd: BorrowedFd<'_>,
+    addr: &SocketAddrUnix,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    msg_flags: SendFlags,
+) -> io::Result<usize> {
+    with_unix_msghdr(addr, iov, control, |msghdr| {
+        #[cfg(not(target_arch = "x86"))]
+        let result =
+            unsafe { ret_usize(syscall!(__NR_sendmsg, sockfd, by_ref(&msghdr), msg_flags)) };
+
+        #[cfg(target_arch = "x86")]
+        let result = unsafe {
+            ret_usize(syscall!(
+                __NR_socketcall,
+                x86_sys(SYS_SENDMSG),
+                slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                    sockfd.into(),
+                    by_ref(&msghdr),
+                    msg_flags.into()
+                ])
+            ))
+        };
+
+        result
+    })
+}
+
+#[inline]
+pub(crate) fn shutdown(fd: BorrowedFd<'_>, how: Shutdown) -> io::Result<()> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_shutdown,
+            fd,
+            c_uint(how as c::c_uint)
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_SHUTDOWN),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[fd.into(), c_uint(how as c::c_uint)])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn send(fd: BorrowedFd<'_>, buf: &[u8], flags: SendFlags) -> io::Result<usize> {
+    let (buf_addr, buf_len) = slice(buf);
+
+    #[cfg(not(any(
+        target_arch = "aarch64",
+        target_arch = "mips64",
+        target_arch = "mips64r6",
+        target_arch = "riscv64",
+        target_arch = "x86",
+        target_arch = "x86_64",
+    )))]
+    unsafe {
+        ret_usize(syscall_readonly!(__NR_send, fd, buf_addr, buf_len, flags))
+    }
+    #[cfg(any(
+        target_arch = "aarch64",
+        target_arch = "mips64",
+        target_arch = "mips64r6",
+        target_arch = "riscv64",
+        target_arch = "x86_64",
+    ))]
+    unsafe {
+        ret_usize(syscall_readonly!(
+            __NR_sendto,
+            fd,
+            buf_addr,
+            buf_len,
+            flags,
+            zero(),
+            zero()
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret_usize(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_SEND),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                buf_addr,
+                buf_len,
+                flags.into()
+            ])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn sendto_v4(
+    fd: BorrowedFd<'_>,
+    buf: &[u8],
+    flags: SendFlags,
+    addr: &SocketAddrV4,
+) -> io::Result<usize> {
+    let (buf_addr, buf_len) = slice(buf);
+
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret_usize(syscall_readonly!(
+            __NR_sendto,
+            fd,
+            buf_addr,
+            buf_len,
+            flags,
+            by_ref(&encode_sockaddr_v4(addr)),
+            size_of::<sockaddr_in, _>()
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret_usize(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_SENDTO),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                buf_addr,
+                buf_len,
+                flags.into(),
+                by_ref(&encode_sockaddr_v4(addr)),
+                size_of::<sockaddr_in, _>(),
+            ])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn sendto_v6(
+    fd: BorrowedFd<'_>,
+    buf: &[u8],
+    flags: SendFlags,
+    addr: &SocketAddrV6,
+) -> io::Result<usize> {
+    let (buf_addr, buf_len) = slice(buf);
+
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret_usize(syscall_readonly!(
+            __NR_sendto,
+            fd,
+            buf_addr,
+            buf_len,
+            flags,
+            by_ref(&encode_sockaddr_v6(addr)),
+            size_of::<sockaddr_in6, _>()
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret_usize(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_SENDTO),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                buf_addr,
+                buf_len,
+                flags.into(),
+                by_ref(&encode_sockaddr_v6(addr)),
+                size_of::<sockaddr_in6, _>(),
+            ])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn sendto_unix(
+    fd: BorrowedFd<'_>,
+    buf: &[u8],
+    flags: SendFlags,
+    addr: &SocketAddrUnix,
+) -> io::Result<usize> {
+    let (buf_addr, buf_len) = slice(buf);
+
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret_usize(syscall_readonly!(
+            __NR_sendto,
+            fd,
+            buf_addr,
+            buf_len,
+            flags,
+            by_ref(&addr.unix),
+            socklen_t(addr.addr_len())
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret_usize(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_SENDTO),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                buf_addr,
+                buf_len,
+                flags.into(),
+                by_ref(&addr.unix),
+                socklen_t(addr.addr_len()),
+            ])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) unsafe fn recv(
+    fd: BorrowedFd<'_>,
+    buf: *mut u8,
+    len: usize,
+    flags: RecvFlags,
+) -> io::Result<usize> {
+    #[cfg(not(any(
+        target_arch = "aarch64",
+        target_arch = "mips64",
+        target_arch = "mips64r6",
+        target_arch = "riscv64",
+        target_arch = "x86",
+        target_arch = "x86_64",
+    )))]
+    {
+        ret_usize(syscall!(__NR_recv, fd, buf, pass_usize(len), flags))
+    }
+    #[cfg(any(
+        target_arch = "aarch64",
+        target_arch = "mips64",
+        target_arch = "mips64r6",
+        target_arch = "riscv64",
+        target_arch = "x86_64",
+    ))]
+    {
+        ret_usize(syscall!(
+            __NR_recvfrom,
+            fd,
+            buf,
+            pass_usize(len),
+            flags,
+            zero(),
+            zero()
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    {
+        ret_usize(syscall!(
+            __NR_socketcall,
+            x86_sys(SYS_RECV),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                buf.into(),
+                pass_usize(len),
+                flags.into(),
+            ])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) unsafe fn recvfrom(
+    fd: BorrowedFd<'_>,
+    buf: *mut u8,
+    len: usize,
+    flags: RecvFlags,
+) -> io::Result<(usize, Option<SocketAddrAny>)> {
+    let mut addrlen = core::mem::size_of::<sockaddr>() as socklen_t;
+    let mut storage = MaybeUninit::<sockaddr>::uninit();
+
+    // `recvfrom` does not write to the storage if the socket is
+    // connection-oriented sockets, so we initialize the family field to
+    // `AF_UNSPEC` so that we can detect this case.
+    initialize_family_to_unspec(storage.as_mut_ptr());
+
+    #[cfg(not(target_arch = "x86"))]
+    let nread = ret_usize(syscall!(
+        __NR_recvfrom,
+        fd,
+        buf,
+        pass_usize(len),
+        flags,
+        &mut storage,
+        by_mut(&mut addrlen)
+    ))?;
+    #[cfg(target_arch = "x86")]
+    let nread = ret_usize(syscall!(
+        __NR_socketcall,
+        x86_sys(SYS_RECVFROM),
+        slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+            fd.into(),
+            buf.into(),
+            pass_usize(len),
+            flags.into(),
+            (&mut storage).into(),
+            by_mut(&mut addrlen),
+        ])
+    ))?;
+
+    Ok((
+        nread,
+        maybe_read_sockaddr_os(&storage.assume_init(), addrlen.try_into().unwrap()),
+    ))
+}
+
+#[inline]
+pub(crate) fn getpeername(fd: BorrowedFd<'_>) -> io::Result<Option<SocketAddrAny>> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        let mut addrlen = core::mem::size_of::<sockaddr>() as socklen_t;
+        let mut storage = MaybeUninit::<sockaddr>::uninit();
+        ret(syscall!(
+            __NR_getpeername,
+            fd,
+            &mut storage,
+            by_mut(&mut addrlen)
+        ))?;
+        Ok(maybe_read_sockaddr_os(
+            &storage.assume_init(),
+            addrlen.try_into().unwrap(),
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        let mut addrlen = core::mem::size_of::<sockaddr>() as socklen_t;
+        let mut storage = MaybeUninit::<sockaddr>::uninit();
+        ret(syscall!(
+            __NR_socketcall,
+            x86_sys(SYS_GETPEERNAME),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                (&mut storage).into(),
+                by_mut(&mut addrlen),
+            ])
+        ))?;
+        Ok(maybe_read_sockaddr_os(
+            &storage.assume_init(),
+            addrlen.try_into().unwrap(),
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn getsockname(fd: BorrowedFd<'_>) -> io::Result<SocketAddrAny> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        let mut addrlen = core::mem::size_of::<sockaddr>() as socklen_t;
+        let mut storage = MaybeUninit::<sockaddr>::uninit();
+        ret(syscall!(
+            __NR_getsockname,
+            fd,
+            &mut storage,
+            by_mut(&mut addrlen)
+        ))?;
+        Ok(read_sockaddr_os(
+            &storage.assume_init(),
+            addrlen.try_into().unwrap(),
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        let mut addrlen = core::mem::size_of::<sockaddr>() as socklen_t;
+        let mut storage = MaybeUninit::<sockaddr>::uninit();
+        ret(syscall!(
+            __NR_socketcall,
+            x86_sys(SYS_GETSOCKNAME),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                (&mut storage).into(),
+                by_mut(&mut addrlen),
+            ])
+        ))?;
+        Ok(read_sockaddr_os(
+            &storage.assume_init(),
+            addrlen.try_into().unwrap(),
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn bind_v4(fd: BorrowedFd<'_>, addr: &SocketAddrV4) -> io::Result<()> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_bind,
+            fd,
+            by_ref(&encode_sockaddr_v4(addr)),
+            size_of::<sockaddr_in, _>()
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_BIND),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                by_ref(&encode_sockaddr_v4(addr)),
+                size_of::<sockaddr_in, _>(),
+            ])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn bind_v6(fd: BorrowedFd<'_>, addr: &SocketAddrV6) -> io::Result<()> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_bind,
+            fd,
+            by_ref(&encode_sockaddr_v6(addr)),
+            size_of::<sockaddr_in6, _>()
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_BIND),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                by_ref(&encode_sockaddr_v6(addr)),
+                size_of::<sockaddr_in6, _>(),
+            ])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn bind_unix(fd: BorrowedFd<'_>, addr: &SocketAddrUnix) -> io::Result<()> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_bind,
+            fd,
+            by_ref(&addr.unix),
+            socklen_t(addr.addr_len())
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_BIND),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                by_ref(&addr.unix),
+                socklen_t(addr.addr_len()),
+            ])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn connect_v4(fd: BorrowedFd<'_>, addr: &SocketAddrV4) -> io::Result<()> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_connect,
+            fd,
+            by_ref(&encode_sockaddr_v4(addr)),
+            size_of::<sockaddr_in, _>()
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_CONNECT),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                by_ref(&encode_sockaddr_v4(addr)),
+                size_of::<sockaddr_in, _>(),
+            ])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn connect_v6(fd: BorrowedFd<'_>, addr: &SocketAddrV6) -> io::Result<()> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_connect,
+            fd,
+            by_ref(&encode_sockaddr_v6(addr)),
+            size_of::<sockaddr_in6, _>()
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_CONNECT),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                by_ref(&encode_sockaddr_v6(addr)),
+                size_of::<sockaddr_in6, _>(),
+            ])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn connect_unix(fd: BorrowedFd<'_>, addr: &SocketAddrUnix) -> io::Result<()> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_connect,
+            fd,
+            by_ref(&addr.unix),
+            socklen_t(addr.addr_len())
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_CONNECT),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                by_ref(&addr.unix),
+                socklen_t(addr.addr_len()),
+            ])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn connect_unspec(fd: BorrowedFd<'_>) -> io::Result<()> {
+    debug_assert_eq!(c::AF_UNSPEC, 0);
+    let addr = MaybeUninit::<c::sockaddr_storage>::zeroed();
+
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_connect,
+            fd,
+            by_ref(&addr),
+            size_of::<c::sockaddr_storage, _>()
+        ))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_CONNECT),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[
+                fd.into(),
+                by_ref(&addr),
+                size_of::<c::sockaddr_storage, _>(),
+            ])
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn listen(fd: BorrowedFd<'_>, backlog: c::c_int) -> io::Result<()> {
+    #[cfg(not(target_arch = "x86"))]
+    unsafe {
+        ret(syscall_readonly!(__NR_listen, fd, c_int(backlog)))
+    }
+    #[cfg(target_arch = "x86")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_socketcall,
+            x86_sys(SYS_LISTEN),
+            slice_just_addr::<ArgReg<'_, SocketArg>, _>(&[fd.into(), c_int(backlog)])
+        ))
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/net/write_sockaddr.rs b/vendor/rustix/src/backend/linux_raw/net/write_sockaddr.rs
new file mode 100644
index 0000000..24edd49
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/net/write_sockaddr.rs
@@ -0,0 +1,60 @@
+//! The BSD sockets API requires us to read the `ss_family` field before we can
+//! interpret the rest of a `sockaddr` produced by the kernel.
+#![allow(unsafe_code)]
+
+use crate::backend::c;
+use crate::net::{SocketAddrAny, SocketAddrStorage, SocketAddrUnix, SocketAddrV4, SocketAddrV6};
+use core::mem::size_of;
+
+pub(crate) unsafe fn write_sockaddr(
+    addr: &SocketAddrAny,
+    storage: *mut SocketAddrStorage,
+) -> usize {
+    match addr {
+        SocketAddrAny::V4(v4) => write_sockaddr_v4(v4, storage),
+        SocketAddrAny::V6(v6) => write_sockaddr_v6(v6, storage),
+        SocketAddrAny::Unix(unix) => write_sockaddr_unix(unix, storage),
+    }
+}
+
+pub(crate) fn encode_sockaddr_v4(v4: &SocketAddrV4) -> c::sockaddr_in {
+    c::sockaddr_in {
+        sin_family: c::AF_INET as _,
+        sin_port: u16::to_be(v4.port()),
+        sin_addr: c::in_addr {
+            s_addr: u32::from_ne_bytes(v4.ip().octets()),
+        },
+        __pad: [0_u8; 8],
+    }
+}
+
+unsafe fn write_sockaddr_v4(v4: &SocketAddrV4, storage: *mut SocketAddrStorage) -> usize {
+    let encoded = encode_sockaddr_v4(v4);
+    core::ptr::write(storage.cast(), encoded);
+    size_of::<c::sockaddr_in>()
+}
+
+pub(crate) fn encode_sockaddr_v6(v6: &SocketAddrV6) -> c::sockaddr_in6 {
+    c::sockaddr_in6 {
+        sin6_family: c::AF_INET6 as _,
+        sin6_port: u16::to_be(v6.port()),
+        sin6_flowinfo: u32::to_be(v6.flowinfo()),
+        sin6_addr: c::in6_addr {
+            in6_u: linux_raw_sys::net::in6_addr__bindgen_ty_1 {
+                u6_addr8: v6.ip().octets(),
+            },
+        },
+        sin6_scope_id: v6.scope_id(),
+    }
+}
+
+unsafe fn write_sockaddr_v6(v6: &SocketAddrV6, storage: *mut SocketAddrStorage) -> usize {
+    let encoded = encode_sockaddr_v6(v6);
+    core::ptr::write(storage.cast(), encoded);
+    size_of::<c::sockaddr_in6>()
+}
+
+unsafe fn write_sockaddr_unix(unix: &SocketAddrUnix, storage: *mut SocketAddrStorage) -> usize {
+    core::ptr::write(storage.cast(), unix.unix);
+    unix.len()
+}
diff --git a/vendor/rustix/src/backend/linux_raw/param/auxv.rs b/vendor/rustix/src/backend/linux_raw/param/auxv.rs
new file mode 100644
index 0000000..b9ac27e
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/param/auxv.rs
@@ -0,0 +1,507 @@
+//! Linux auxv support.
+//!
+//! # Safety
+//!
+//! This uses raw pointers to locate and read the kernel-provided auxv array.
+#![allow(unsafe_code)]
+
+use crate::backend::c;
+use crate::fd::OwnedFd;
+#[cfg(feature = "param")]
+use crate::ffi::CStr;
+use crate::fs::{Mode, OFlags};
+use crate::utils::{as_ptr, check_raw_pointer};
+#[cfg(feature = "alloc")]
+use alloc::vec::Vec;
+use core::mem::size_of;
+use core::ptr::{null_mut, read_unaligned, NonNull};
+#[cfg(feature = "runtime")]
+use core::sync::atomic::AtomicU8;
+use core::sync::atomic::Ordering::Relaxed;
+use core::sync::atomic::{AtomicPtr, AtomicUsize};
+use linux_raw_sys::elf::*;
+use linux_raw_sys::general::{
+    AT_BASE, AT_CLKTCK, AT_EXECFN, AT_HWCAP, AT_HWCAP2, AT_NULL, AT_PAGESZ, AT_SYSINFO_EHDR,
+};
+#[cfg(feature = "runtime")]
+use linux_raw_sys::general::{
+    AT_EGID, AT_ENTRY, AT_EUID, AT_GID, AT_PHDR, AT_PHENT, AT_PHNUM, AT_RANDOM, AT_SECURE, AT_UID,
+};
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn page_size() -> usize {
+    let mut page_size = PAGE_SIZE.load(Relaxed);
+
+    if page_size == 0 {
+        init_auxv();
+        page_size = PAGE_SIZE.load(Relaxed);
+    }
+
+    page_size
+}
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn clock_ticks_per_second() -> u64 {
+    let mut ticks = CLOCK_TICKS_PER_SECOND.load(Relaxed);
+
+    if ticks == 0 {
+        init_auxv();
+        ticks = CLOCK_TICKS_PER_SECOND.load(Relaxed);
+    }
+
+    ticks as u64
+}
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn linux_hwcap() -> (usize, usize) {
+    let mut hwcap = HWCAP.load(Relaxed);
+    let mut hwcap2 = HWCAP2.load(Relaxed);
+
+    if hwcap == 0 || hwcap2 == 0 {
+        init_auxv();
+        hwcap = HWCAP.load(Relaxed);
+        hwcap2 = HWCAP2.load(Relaxed);
+    }
+
+    (hwcap, hwcap2)
+}
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn linux_execfn() -> &'static CStr {
+    let mut execfn = EXECFN.load(Relaxed);
+
+    if execfn.is_null() {
+        init_auxv();
+        execfn = EXECFN.load(Relaxed);
+    }
+
+    // SAFETY: We assume the `AT_EXECFN` value provided by the kernel is a
+    // valid pointer to a valid NUL-terminated array of bytes.
+    unsafe { CStr::from_ptr(execfn.cast()) }
+}
+
+#[cfg(feature = "runtime")]
+#[inline]
+pub(crate) fn linux_secure() -> bool {
+    let mut secure = SECURE.load(Relaxed);
+
+    // 0 means not initialized yet.
+    if secure == 0 {
+        init_auxv();
+        secure = SECURE.load(Relaxed);
+    }
+
+    // 0 means not present. Libc `getauxval(AT_SECURE)` would return 0.
+    // 1 means not in secure mode.
+    // 2 means in secure mode.
+    secure > 1
+}
+
+#[cfg(feature = "runtime")]
+#[inline]
+pub(crate) fn exe_phdrs() -> (*const c::c_void, usize, usize) {
+    let mut phdr = PHDR.load(Relaxed);
+    let mut phent = PHENT.load(Relaxed);
+    let mut phnum = PHNUM.load(Relaxed);
+
+    if phdr.is_null() || phnum == 0 {
+        init_auxv();
+        phdr = PHDR.load(Relaxed);
+        phent = PHENT.load(Relaxed);
+        phnum = PHNUM.load(Relaxed);
+    }
+
+    (phdr.cast(), phent, phnum)
+}
+
+/// `AT_SYSINFO_EHDR` isn't present on all platforms in all configurations, so
+/// if we don't see it, this function returns a null pointer.
+#[inline]
+pub(in super::super) fn sysinfo_ehdr() -> *const Elf_Ehdr {
+    let mut ehdr = SYSINFO_EHDR.load(Relaxed);
+
+    if ehdr.is_null() {
+        init_auxv();
+        ehdr = SYSINFO_EHDR.load(Relaxed);
+    }
+
+    ehdr
+}
+
+#[cfg(feature = "runtime")]
+#[inline]
+pub(crate) fn entry() -> usize {
+    let mut entry = ENTRY.load(Relaxed);
+
+    if entry == 0 {
+        init_auxv();
+        entry = ENTRY.load(Relaxed);
+    }
+
+    entry
+}
+
+#[cfg(feature = "runtime")]
+#[inline]
+pub(crate) fn random() -> *const [u8; 16] {
+    let mut random = RANDOM.load(Relaxed);
+
+    if random.is_null() {
+        init_auxv();
+        random = RANDOM.load(Relaxed);
+    }
+
+    random
+}
+
+static PAGE_SIZE: AtomicUsize = AtomicUsize::new(0);
+static CLOCK_TICKS_PER_SECOND: AtomicUsize = AtomicUsize::new(0);
+static HWCAP: AtomicUsize = AtomicUsize::new(0);
+static HWCAP2: AtomicUsize = AtomicUsize::new(0);
+static EXECFN: AtomicPtr<c::c_char> = AtomicPtr::new(null_mut());
+static SYSINFO_EHDR: AtomicPtr<Elf_Ehdr> = AtomicPtr::new(null_mut());
+#[cfg(feature = "runtime")]
+static SECURE: AtomicU8 = AtomicU8::new(0);
+#[cfg(feature = "runtime")]
+static PHDR: AtomicPtr<Elf_Phdr> = AtomicPtr::new(null_mut());
+#[cfg(feature = "runtime")]
+static PHENT: AtomicUsize = AtomicUsize::new(0);
+#[cfg(feature = "runtime")]
+static PHNUM: AtomicUsize = AtomicUsize::new(0);
+#[cfg(feature = "runtime")]
+static ENTRY: AtomicUsize = AtomicUsize::new(0);
+#[cfg(feature = "runtime")]
+static RANDOM: AtomicPtr<[u8; 16]> = AtomicPtr::new(null_mut());
+
+#[cfg(feature = "alloc")]
+fn pr_get_auxv() -> crate::io::Result<Vec<u8>> {
+    use super::super::conv::{c_int, pass_usize, ret_usize};
+    const PR_GET_AUXV: c::c_int = 0x4155_5856;
+    let mut buffer = alloc::vec![0u8; 512];
+    let len = unsafe {
+        ret_usize(syscall_always_asm!(
+            __NR_prctl,
+            c_int(PR_GET_AUXV),
+            buffer.as_ptr(),
+            pass_usize(buffer.len()),
+            pass_usize(0),
+            pass_usize(0)
+        ))?
+    };
+    if len <= buffer.len() {
+        buffer.truncate(len);
+        return Ok(buffer);
+    }
+    buffer.resize(len, 0);
+    let len = unsafe {
+        ret_usize(syscall_always_asm!(
+            __NR_prctl,
+            c_int(PR_GET_AUXV),
+            buffer.as_ptr(),
+            pass_usize(buffer.len()),
+            pass_usize(0),
+            pass_usize(0)
+        ))?
+    };
+    assert_eq!(len, buffer.len());
+    return Ok(buffer);
+}
+
+/// If we don't have "use-explicitly-provided-auxv" or "use-libc-auxv", we
+/// read the aux vector via the `prctl` `PR_GET_AUXV`, with a fallback to
+/// /proc/self/auxv for kernels that don't support `PR_GET_AUXV`.
+#[cold]
+fn init_auxv() {
+    #[cfg(feature = "alloc")]
+    {
+        match pr_get_auxv() {
+            Ok(buffer) => {
+                // SAFETY: We assume the kernel returns a valid auxv.
+                unsafe {
+                    init_from_aux_iter(AuxPointer(buffer.as_ptr().cast())).unwrap();
+                }
+                return;
+            }
+            Err(_) => {
+                // Fall back to /proc/self/auxv on error.
+            }
+        }
+    }
+
+    // Open "/proc/self/auxv", either because we trust "/proc", or because
+    // we're running inside QEMU and `proc_self_auxv`'s extra checking foils
+    // QEMU's emulation so we need to do a plain open to get the right
+    // auxv records.
+    let file = crate::fs::open("/proc/self/auxv", OFlags::RDONLY, Mode::empty()).unwrap();
+
+    #[cfg(feature = "alloc")]
+    init_from_auxv_file(file).unwrap();
+
+    #[cfg(not(feature = "alloc"))]
+    unsafe {
+        init_from_aux_iter(AuxFile(file)).unwrap();
+    }
+}
+
+/// Process auxv entries from the open file `auxv`.
+#[cfg(feature = "alloc")]
+#[cold]
+#[must_use]
+fn init_from_auxv_file(auxv: OwnedFd) -> Option<()> {
+    let mut buffer = Vec::<u8>::with_capacity(512);
+    loop {
+        let cur = buffer.len();
+
+        // Request one extra byte; `Vec` will often allocate more.
+        buffer.reserve(1);
+
+        // Use all the space it allocated.
+        buffer.resize(buffer.capacity(), 0);
+
+        // Read up to that many bytes.
+        let n = match crate::io::read(&auxv, &mut buffer[cur..]) {
+            Err(crate::io::Errno::INTR) => 0,
+            Err(_err) => panic!(),
+            Ok(0) => break,
+            Ok(n) => n,
+        };
+
+        // Account for the number of bytes actually read.
+        buffer.resize(cur + n, 0_u8);
+    }
+
+    // SAFETY: We loaded from an auxv file into the buffer.
+    unsafe { init_from_aux_iter(AuxPointer(buffer.as_ptr().cast())) }
+}
+
+/// Process auxv entries from the auxv array pointed to by `auxp`.
+///
+/// # Safety
+///
+/// This must be passed a pointer to an auxv array.
+///
+/// The buffer contains `Elf_aux_t` elements, though it need not be aligned;
+/// function uses `read_unaligned` to read from it.
+#[cold]
+#[must_use]
+unsafe fn init_from_aux_iter(aux_iter: impl Iterator<Item = Elf_auxv_t>) -> Option<()> {
+    let mut pagesz = 0;
+    let mut clktck = 0;
+    let mut hwcap = 0;
+    let mut hwcap2 = 0;
+    let mut execfn = null_mut();
+    let mut sysinfo_ehdr = null_mut();
+    #[cfg(feature = "runtime")]
+    let mut secure = 0;
+    #[cfg(feature = "runtime")]
+    let mut phdr = null_mut();
+    #[cfg(feature = "runtime")]
+    let mut phnum = 0;
+    #[cfg(feature = "runtime")]
+    let mut phent = 0;
+    #[cfg(feature = "runtime")]
+    let mut entry = 0;
+    #[cfg(feature = "runtime")]
+    let mut uid = None;
+    #[cfg(feature = "runtime")]
+    let mut euid = None;
+    #[cfg(feature = "runtime")]
+    let mut gid = None;
+    #[cfg(feature = "runtime")]
+    let mut egid = None;
+    #[cfg(feature = "runtime")]
+    let mut random = null_mut();
+
+    for Elf_auxv_t { a_type, a_val } in aux_iter {
+        match a_type as _ {
+            AT_PAGESZ => pagesz = a_val as usize,
+            AT_CLKTCK => clktck = a_val as usize,
+            AT_HWCAP => hwcap = a_val as usize,
+            AT_HWCAP2 => hwcap2 = a_val as usize,
+            AT_EXECFN => execfn = check_raw_pointer::<c::c_char>(a_val as *mut _)?.as_ptr(),
+            AT_SYSINFO_EHDR => sysinfo_ehdr = check_elf_base(a_val as *mut _)?.as_ptr(),
+
+            AT_BASE => {
+                // The `AT_BASE` value can be NULL in a static executable that
+                // doesn't use a dynamic linker. If so, ignore it.
+                if !a_val.is_null() {
+                    let _ = check_elf_base(a_val.cast())?;
+                }
+            }
+
+            #[cfg(feature = "runtime")]
+            AT_SECURE => secure = (a_val as usize != 0) as u8 + 1,
+            #[cfg(feature = "runtime")]
+            AT_UID => uid = Some(a_val),
+            #[cfg(feature = "runtime")]
+            AT_EUID => euid = Some(a_val),
+            #[cfg(feature = "runtime")]
+            AT_GID => gid = Some(a_val),
+            #[cfg(feature = "runtime")]
+            AT_EGID => egid = Some(a_val),
+            #[cfg(feature = "runtime")]
+            AT_PHDR => phdr = check_raw_pointer::<Elf_Phdr>(a_val as *mut _)?.as_ptr(),
+            #[cfg(feature = "runtime")]
+            AT_PHNUM => phnum = a_val as usize,
+            #[cfg(feature = "runtime")]
+            AT_PHENT => phent = a_val as usize,
+            #[cfg(feature = "runtime")]
+            AT_ENTRY => entry = a_val as usize,
+            #[cfg(feature = "runtime")]
+            AT_RANDOM => random = check_raw_pointer::<[u8; 16]>(a_val as *mut _)?.as_ptr(),
+
+            AT_NULL => break,
+            _ => (),
+        }
+    }
+
+    #[cfg(feature = "runtime")]
+    assert_eq!(phent, size_of::<Elf_Phdr>());
+
+    // If we're running set-uid or set-gid, enable “secure execution” mode,
+    // which doesn't do much, but users may be depending on the things that
+    // it does do.
+    #[cfg(feature = "runtime")]
+    if uid != euid || gid != egid {
+        secure = 2;
+    }
+
+    // The base and sysinfo_ehdr (if present) matches our platform. Accept the
+    // aux values.
+    PAGE_SIZE.store(pagesz, Relaxed);
+    CLOCK_TICKS_PER_SECOND.store(clktck, Relaxed);
+    HWCAP.store(hwcap, Relaxed);
+    HWCAP2.store(hwcap2, Relaxed);
+    EXECFN.store(execfn, Relaxed);
+    SYSINFO_EHDR.store(sysinfo_ehdr, Relaxed);
+    #[cfg(feature = "runtime")]
+    SECURE.store(secure, Relaxed);
+    #[cfg(feature = "runtime")]
+    PHDR.store(phdr, Relaxed);
+    #[cfg(feature = "runtime")]
+    PHNUM.store(phnum, Relaxed);
+    #[cfg(feature = "runtime")]
+    ENTRY.store(entry, Relaxed);
+    #[cfg(feature = "runtime")]
+    RANDOM.store(random, Relaxed);
+
+    Some(())
+}
+
+/// Check that `base` is a valid pointer to the kernel-provided vDSO.
+///
+/// `base` is some value we got from a `AT_SYSINFO_EHDR` aux record somewhere,
+/// which hopefully holds the value of the kernel-provided vDSO in memory. Do a
+/// series of checks to be as sure as we can that it's safe to use.
+#[cold]
+#[must_use]
+unsafe fn check_elf_base(base: *const Elf_Ehdr) -> Option<NonNull<Elf_Ehdr>> {
+    // If we're reading a 64-bit auxv on a 32-bit platform, we'll see a zero
+    // `a_val` because `AT_*` values are never greater than `u32::MAX`. Zero is
+    // used by libc's `getauxval` to indicate errors, so it should never be a
+    // valid value.
+    if base.is_null() {
+        return None;
+    }
+
+    let hdr = match check_raw_pointer::<Elf_Ehdr>(base as *mut _) {
+        Some(hdr) => hdr,
+        None => return None,
+    };
+
+    let hdr = hdr.as_ref();
+    if hdr.e_ident[..SELFMAG] != ELFMAG {
+        return None; // Wrong ELF magic
+    }
+    if !matches!(hdr.e_ident[EI_OSABI], ELFOSABI_SYSV | ELFOSABI_LINUX) {
+        return None; // Unrecognized ELF OS ABI
+    }
+    if hdr.e_ident[EI_ABIVERSION] != ELFABIVERSION {
+        return None; // Unrecognized ELF ABI version
+    }
+    if hdr.e_type != ET_DYN {
+        return None; // Wrong ELF type
+    }
+
+    // If ELF is extended, we'll need to adjust.
+    if hdr.e_ident[EI_VERSION] != EV_CURRENT
+        || hdr.e_ehsize as usize != size_of::<Elf_Ehdr>()
+        || hdr.e_phentsize as usize != size_of::<Elf_Phdr>()
+    {
+        return None;
+    }
+    // We don't currently support extra-large numbers of segments.
+    if hdr.e_phnum == PN_XNUM {
+        return None;
+    }
+
+    // If `e_phoff` is zero, it's more likely that we're looking at memory that
+    // has been zeroed than that the kernel has somehow aliased the `Ehdr` and
+    // the `Phdr`.
+    if hdr.e_phoff < size_of::<Elf_Ehdr>() {
+        return None;
+    }
+
+    // Verify that the `EI_CLASS`/`EI_DATA`/`e_machine` fields match the
+    // architecture we're running as. This helps catch cases where we're
+    // running under QEMU.
+    if hdr.e_ident[EI_CLASS] != ELFCLASS {
+        return None; // Wrong ELF class
+    }
+    if hdr.e_ident[EI_DATA] != ELFDATA {
+        return None; // Wrong ELF data
+    }
+    if hdr.e_machine != EM_CURRENT {
+        return None; // Wrong machine type
+    }
+
+    Some(NonNull::new_unchecked(as_ptr(hdr) as *mut _))
+}
+
+// Aux reading utilities
+
+// Read auxv records from an array in memory.
+struct AuxPointer(*const Elf_auxv_t);
+
+impl Iterator for AuxPointer {
+    type Item = Elf_auxv_t;
+
+    #[cold]
+    fn next(&mut self) -> Option<Self::Item> {
+        unsafe {
+            let value = read_unaligned(self.0);
+            self.0 = self.0.add(1);
+            Some(value)
+        }
+    }
+}
+
+// Read auxv records from a file.
+#[cfg(not(feature = "alloc"))]
+struct AuxFile(OwnedFd);
+
+#[cfg(not(feature = "alloc"))]
+impl Iterator for AuxFile {
+    type Item = Elf_auxv_t;
+
+    // This implementation does lots of `read`s and it isn't amazing, but
+    // hopefully we won't use it often.
+    #[cold]
+    fn next(&mut self) -> Option<Self::Item> {
+        let mut buf = [0_u8; size_of::<Self::Item>()];
+        let mut slice = &mut buf[..];
+        while !slice.is_empty() {
+            match crate::io::read(&self.0, slice) {
+                Ok(0) => panic!("unexpected end of auxv file"),
+                Ok(n) => slice = &mut slice[n..],
+                Err(crate::io::Errno::INTR) => continue,
+                Err(err) => panic!("{:?}", err),
+            }
+        }
+        Some(unsafe { read_unaligned(buf.as_ptr().cast()) })
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/param/init.rs b/vendor/rustix/src/backend/linux_raw/param/init.rs
new file mode 100644
index 0000000..fe29e9c
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/param/init.rs
@@ -0,0 +1,171 @@
+//! Linux auxv `init` function, for "use-explicitly-provided-auxv" mode.
+//!
+//! # Safety
+//!
+//! This uses raw pointers to locate and read the kernel-provided auxv array.
+#![allow(unsafe_code)]
+
+use crate::backend::c;
+#[cfg(feature = "param")]
+use crate::ffi::CStr;
+use core::ffi::c_void;
+use core::ptr::{null_mut, read, NonNull};
+#[cfg(feature = "runtime")]
+use core::sync::atomic::AtomicBool;
+use core::sync::atomic::{AtomicPtr, AtomicUsize, Ordering};
+use linux_raw_sys::elf::*;
+use linux_raw_sys::general::{
+    AT_CLKTCK, AT_EXECFN, AT_HWCAP, AT_HWCAP2, AT_NULL, AT_PAGESZ, AT_SYSINFO_EHDR,
+};
+#[cfg(feature = "runtime")]
+use linux_raw_sys::general::{AT_ENTRY, AT_PHDR, AT_PHENT, AT_PHNUM, AT_RANDOM, AT_SECURE};
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn page_size() -> usize {
+    unsafe { PAGE_SIZE.load(Ordering::Relaxed) }
+}
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn clock_ticks_per_second() -> u64 {
+    unsafe { CLOCK_TICKS_PER_SECOND.load(Ordering::Relaxed) as u64 }
+}
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn linux_hwcap() -> (usize, usize) {
+    unsafe {
+        (
+            HWCAP.load(Ordering::Relaxed),
+            HWCAP2.load(Ordering::Relaxed),
+        )
+    }
+}
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn linux_execfn() -> &'static CStr {
+    let execfn = unsafe { EXECFN.load(Ordering::Relaxed) };
+
+    // SAFETY: We initialize `EXECFN` to a valid `CStr` pointer, and we assume
+    // the `AT_EXECFN` value provided by the kernel points to a valid C string.
+    unsafe { CStr::from_ptr(execfn.cast()) }
+}
+
+#[cfg(feature = "runtime")]
+#[inline]
+pub(crate) fn linux_secure() -> bool {
+    unsafe { SECURE.load(Ordering::Relaxed) }
+}
+
+#[cfg(feature = "runtime")]
+#[inline]
+pub(crate) fn exe_phdrs() -> (*const c_void, usize, usize) {
+    unsafe {
+        (
+            PHDR.load(Ordering::Relaxed).cast(),
+            PHENT.load(Ordering::Relaxed),
+            PHNUM.load(Ordering::Relaxed),
+        )
+    }
+}
+
+/// `AT_SYSINFO_EHDR` isn't present on all platforms in all configurations, so
+/// if we don't see it, this function returns a null pointer.
+#[inline]
+pub(in super::super) fn sysinfo_ehdr() -> *const Elf_Ehdr {
+    unsafe { SYSINFO_EHDR.load(Ordering::Relaxed) }
+}
+
+#[cfg(feature = "runtime")]
+#[inline]
+pub(crate) fn entry() -> usize {
+    unsafe { ENTRY.load(Ordering::Relaxed) }
+}
+
+#[cfg(feature = "runtime")]
+#[inline]
+pub(crate) fn random() -> *const [u8; 16] {
+    unsafe { RANDOM.load(Ordering::Relaxed) }
+}
+
+static mut PAGE_SIZE: AtomicUsize = AtomicUsize::new(0);
+static mut CLOCK_TICKS_PER_SECOND: AtomicUsize = AtomicUsize::new(0);
+static mut HWCAP: AtomicUsize = AtomicUsize::new(0);
+static mut HWCAP2: AtomicUsize = AtomicUsize::new(0);
+static mut SYSINFO_EHDR: AtomicPtr<Elf_Ehdr> = AtomicPtr::new(null_mut());
+// Initialize `EXECFN` to a valid `CStr` pointer so that we don't need to check
+// for null on every `execfn` call.
+static mut EXECFN: AtomicPtr<c::c_char> = AtomicPtr::new(b"\0".as_ptr() as _);
+#[cfg(feature = "runtime")]
+static mut SECURE: AtomicBool = AtomicBool::new(false);
+// Use `dangling` so that we can always treat it like an empty slice.
+#[cfg(feature = "runtime")]
+static mut PHDR: AtomicPtr<Elf_Phdr> = AtomicPtr::new(NonNull::dangling().as_ptr());
+#[cfg(feature = "runtime")]
+static mut PHENT: AtomicUsize = AtomicUsize::new(0);
+#[cfg(feature = "runtime")]
+static mut PHNUM: AtomicUsize = AtomicUsize::new(0);
+#[cfg(feature = "runtime")]
+static mut ENTRY: AtomicUsize = AtomicUsize::new(0);
+#[cfg(feature = "runtime")]
+static mut RANDOM: AtomicPtr<[u8; 16]> = AtomicPtr::new(NonNull::dangling().as_ptr());
+
+/// When "use-explicitly-provided-auxv" is enabled, we export a function to be
+/// called during initialization, and passed a pointer to the original
+/// environment variable block set up by the OS.
+pub(crate) unsafe fn init(envp: *mut *mut u8) {
+    init_from_envp(envp);
+}
+
+/// # Safety
+///
+/// This must be passed a pointer to the environment variable buffer
+/// provided by the kernel, which is followed in memory by the auxv array.
+unsafe fn init_from_envp(mut envp: *mut *mut u8) {
+    while !(*envp).is_null() {
+        envp = envp.add(1);
+    }
+    init_from_auxp(envp.add(1).cast())
+}
+
+/// Process auxv entries from the auxv array pointed to by `auxp`.
+///
+/// # Safety
+///
+/// This must be passed a pointer to an auxv array.
+///
+/// The buffer contains `Elf_aux_t` elements, though it need not be aligned;
+/// function uses `read_unaligned` to read from it.
+unsafe fn init_from_auxp(mut auxp: *const Elf_auxv_t) {
+    loop {
+        let Elf_auxv_t { a_type, a_val } = read(auxp);
+
+        match a_type as _ {
+            AT_PAGESZ => PAGE_SIZE.store(a_val as usize, Ordering::Relaxed),
+            AT_CLKTCK => CLOCK_TICKS_PER_SECOND.store(a_val as usize, Ordering::Relaxed),
+            AT_HWCAP => HWCAP.store(a_val as usize, Ordering::Relaxed),
+            AT_HWCAP2 => HWCAP2.store(a_val as usize, Ordering::Relaxed),
+            AT_EXECFN => EXECFN.store(a_val.cast::<c::c_char>(), Ordering::Relaxed),
+            AT_SYSINFO_EHDR => SYSINFO_EHDR.store(a_val.cast::<Elf_Ehdr>(), Ordering::Relaxed),
+
+            #[cfg(feature = "runtime")]
+            AT_SECURE => SECURE.store(a_val as usize != 0, Ordering::Relaxed),
+            #[cfg(feature = "runtime")]
+            AT_PHDR => PHDR.store(a_val.cast::<Elf_Phdr>(), Ordering::Relaxed),
+            #[cfg(feature = "runtime")]
+            AT_PHNUM => PHNUM.store(a_val as usize, Ordering::Relaxed),
+            #[cfg(feature = "runtime")]
+            AT_PHENT => PHENT.store(a_val as usize, Ordering::Relaxed),
+            #[cfg(feature = "runtime")]
+            AT_ENTRY => ENTRY.store(a_val as usize, Ordering::Relaxed),
+            #[cfg(feature = "runtime")]
+            AT_RANDOM => RANDOM.store(a_val.cast::<[u8; 16]>(), Ordering::Relaxed),
+
+            AT_NULL => break,
+            _ => (),
+        }
+        auxp = auxp.add(1);
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/param/libc_auxv.rs b/vendor/rustix/src/backend/linux_raw/param/libc_auxv.rs
new file mode 100644
index 0000000..cfdd7a5
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/param/libc_auxv.rs
@@ -0,0 +1,175 @@
+//! Linux auxv support, using libc.
+//!
+//! # Safety
+//!
+//! This uses raw pointers to locate and read the kernel-provided auxv array.
+#![allow(unsafe_code)]
+
+use crate::backend::c;
+#[cfg(feature = "param")]
+use crate::ffi::CStr;
+#[cfg(not(feature = "runtime"))]
+use core::ptr::null;
+use linux_raw_sys::elf::*;
+
+// `getauxval` wasn't supported in glibc until 2.16. Also this lets us use
+// `*mut` as the return type to preserve strict provenance.
+#[cfg(not(feature = "runtime"))]
+weak!(fn getauxval(c::c_ulong) -> *mut c::c_void);
+
+// With the "runtime" feature, go ahead and depend on `getauxval` existing so
+// that we never fail.
+#[cfg(feature = "runtime")]
+extern "C" {
+    fn getauxval(type_: c::c_ulong) -> *mut c::c_void;
+}
+
+#[cfg(feature = "runtime")]
+const AT_PHDR: c::c_ulong = 3;
+#[cfg(feature = "runtime")]
+const AT_PHENT: c::c_ulong = 4;
+#[cfg(feature = "runtime")]
+const AT_PHNUM: c::c_ulong = 5;
+#[cfg(feature = "runtime")]
+const AT_ENTRY: c::c_ulong = 9;
+const AT_HWCAP: c::c_ulong = 16;
+#[cfg(feature = "runtime")]
+const AT_RANDOM: c::c_ulong = 25;
+const AT_HWCAP2: c::c_ulong = 26;
+const AT_SECURE: c::c_ulong = 23;
+const AT_EXECFN: c::c_ulong = 31;
+const AT_SYSINFO_EHDR: c::c_ulong = 33;
+
+// Declare `sysconf` ourselves so that we don't depend on all of libc just for
+// this.
+extern "C" {
+    fn sysconf(name: c::c_int) -> c::c_long;
+}
+
+#[cfg(target_os = "android")]
+const _SC_PAGESIZE: c::c_int = 39;
+#[cfg(target_os = "linux")]
+const _SC_PAGESIZE: c::c_int = 30;
+#[cfg(target_os = "android")]
+const _SC_CLK_TCK: c::c_int = 6;
+#[cfg(target_os = "linux")]
+const _SC_CLK_TCK: c::c_int = 2;
+
+#[test]
+fn test_abi() {
+    const_assert_eq!(self::_SC_PAGESIZE, ::libc::_SC_PAGESIZE);
+    const_assert_eq!(self::_SC_CLK_TCK, ::libc::_SC_CLK_TCK);
+    const_assert_eq!(self::AT_HWCAP, ::libc::AT_HWCAP);
+    const_assert_eq!(self::AT_HWCAP2, ::libc::AT_HWCAP2);
+    const_assert_eq!(self::AT_EXECFN, ::libc::AT_EXECFN);
+    const_assert_eq!(self::AT_SECURE, ::libc::AT_SECURE);
+    const_assert_eq!(self::AT_SYSINFO_EHDR, ::libc::AT_SYSINFO_EHDR);
+    #[cfg(feature = "runtime")]
+    const_assert_eq!(self::AT_PHDR, ::libc::AT_PHDR);
+    #[cfg(feature = "runtime")]
+    const_assert_eq!(self::AT_PHNUM, ::libc::AT_PHNUM);
+    #[cfg(feature = "runtime")]
+    const_assert_eq!(self::AT_ENTRY, ::libc::AT_ENTRY);
+    #[cfg(feature = "runtime")]
+    const_assert_eq!(self::AT_RANDOM, ::libc::AT_RANDOM);
+}
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn page_size() -> usize {
+    unsafe { sysconf(_SC_PAGESIZE) as usize }
+}
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn clock_ticks_per_second() -> u64 {
+    unsafe { sysconf(_SC_CLK_TCK) as u64 }
+}
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn linux_hwcap() -> (usize, usize) {
+    #[cfg(not(feature = "runtime"))]
+    unsafe {
+        if let Some(libc_getauxval) = getauxval.get() {
+            let hwcap = libc_getauxval(AT_HWCAP) as usize;
+            let hwcap2 = libc_getauxval(AT_HWCAP2) as usize;
+            (hwcap, hwcap2)
+        } else {
+            (0, 0)
+        }
+    }
+
+    #[cfg(feature = "runtime")]
+    unsafe {
+        let hwcap = getauxval(AT_HWCAP) as usize;
+        let hwcap2 = getauxval(AT_HWCAP2) as usize;
+        (hwcap, hwcap2)
+    }
+}
+
+#[cfg(feature = "param")]
+#[inline]
+pub(crate) fn linux_execfn() -> &'static CStr {
+    #[cfg(not(feature = "runtime"))]
+    unsafe {
+        if let Some(libc_getauxval) = getauxval.get() {
+            CStr::from_ptr(libc_getauxval(AT_EXECFN).cast())
+        } else {
+            cstr!("")
+        }
+    }
+
+    #[cfg(feature = "runtime")]
+    unsafe {
+        CStr::from_ptr(getauxval(AT_EXECFN).cast())
+    }
+}
+
+#[cfg(feature = "runtime")]
+#[inline]
+pub(crate) fn linux_secure() -> bool {
+    unsafe { getauxval(AT_SECURE) as usize != 0 }
+}
+
+#[cfg(feature = "runtime")]
+#[inline]
+pub(crate) fn exe_phdrs() -> (*const c::c_void, usize, usize) {
+    unsafe {
+        let phdr = getauxval(AT_PHDR) as *const c::c_void;
+        let phent = getauxval(AT_PHENT) as usize;
+        let phnum = getauxval(AT_PHNUM) as usize;
+        (phdr, phent, phnum)
+    }
+}
+
+/// `AT_SYSINFO_EHDR` isn't present on all platforms in all configurations, so
+/// if we don't see it, this function returns a null pointer.
+#[inline]
+pub(in super::super) fn sysinfo_ehdr() -> *const Elf_Ehdr {
+    #[cfg(not(feature = "runtime"))]
+    unsafe {
+        if let Some(libc_getauxval) = getauxval.get() {
+            libc_getauxval(AT_SYSINFO_EHDR) as *const Elf_Ehdr
+        } else {
+            null()
+        }
+    }
+
+    #[cfg(feature = "runtime")]
+    unsafe {
+        getauxval(AT_SYSINFO_EHDR) as *const Elf_Ehdr
+    }
+}
+
+#[cfg(feature = "runtime")]
+#[inline]
+pub(crate) fn entry() -> usize {
+    unsafe { getauxval(AT_ENTRY) as usize }
+}
+
+#[cfg(feature = "runtime")]
+#[inline]
+pub(crate) fn random() -> *const [u8; 16] {
+    unsafe { getauxval(AT_RANDOM) as *const [u8; 16] }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/param/mod.rs b/vendor/rustix/src/backend/linux_raw/param/mod.rs
new file mode 100644
index 0000000..365f016
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/param/mod.rs
@@ -0,0 +1,15 @@
+// With "use-explicitly-provided-auxv" enabled, we expect to be initialized
+// with an explicit `rustix::param::init` call.
+//
+// With "use-libc-auxv" enabled, use libc's `getauxval`.
+//
+// Otherwise, we read aux values from /proc/self/auxv.
+#[cfg_attr(feature = "use-explicitly-provided-auxv", path = "init.rs")]
+#[cfg_attr(
+    all(
+        not(feature = "use-explicitly-provided-auxv"),
+        feature = "use-libc-auxv"
+    ),
+    path = "libc_auxv.rs"
+)]
+pub(crate) mod auxv;
diff --git a/vendor/rustix/src/backend/linux_raw/pid/mod.rs b/vendor/rustix/src/backend/linux_raw/pid/mod.rs
new file mode 100644
index 0000000..ef944f0
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/pid/mod.rs
@@ -0,0 +1 @@
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/linux_raw/pid/syscalls.rs b/vendor/rustix/src/backend/linux_raw/pid/syscalls.rs
new file mode 100644
index 0000000..9665ab3
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/pid/syscalls.rs
@@ -0,0 +1,17 @@
+//! linux_raw syscalls for PIDs
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::conv::ret_usize_infallible;
+use crate::pid::{Pid, RawPid};
+
+#[inline]
+pub(crate) fn getpid() -> Pid {
+    unsafe {
+        let pid = ret_usize_infallible(syscall_readonly!(__NR_getpid)) as RawPid;
+        Pid::from_raw_unchecked(pid)
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/pipe/mod.rs b/vendor/rustix/src/backend/linux_raw/pipe/mod.rs
new file mode 100644
index 0000000..1e0181a
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/pipe/mod.rs
@@ -0,0 +1,2 @@
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/linux_raw/pipe/syscalls.rs b/vendor/rustix/src/backend/linux_raw/pipe/syscalls.rs
new file mode 100644
index 0000000..ec3e459
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/pipe/syscalls.rs
@@ -0,0 +1,135 @@
+//! linux_raw syscalls supporting `rustix::pipe`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::conv::{c_int, c_uint, opt_mut, pass_usize, ret, ret_usize, slice};
+use crate::backend::{c, MAX_IOV};
+use crate::fd::{BorrowedFd, OwnedFd};
+use crate::io;
+use crate::pipe::{IoSliceRaw, PipeFlags, SpliceFlags};
+use core::cmp;
+use core::mem::MaybeUninit;
+use linux_raw_sys::general::{F_GETPIPE_SZ, F_SETPIPE_SZ};
+
+#[inline]
+pub(crate) fn pipe() -> io::Result<(OwnedFd, OwnedFd)> {
+    // aarch64 and risc64 omit `__NR_pipe`. On mips, `__NR_pipe` uses a special
+    // calling convention, but using it is not worth complicating our syscall
+    // wrapping infrastructure at this time.
+    #[cfg(any(
+        target_arch = "aarch64",
+        target_arch = "mips",
+        target_arch = "mips32r6",
+        target_arch = "mips64",
+        target_arch = "mips64r6",
+        target_arch = "riscv64",
+    ))]
+    {
+        pipe_with(PipeFlags::empty())
+    }
+    #[cfg(not(any(
+        target_arch = "aarch64",
+        target_arch = "mips",
+        target_arch = "mips32r6",
+        target_arch = "mips64",
+        target_arch = "mips64r6",
+        target_arch = "riscv64",
+    )))]
+    unsafe {
+        let mut result = MaybeUninit::<[OwnedFd; 2]>::uninit();
+        ret(syscall!(__NR_pipe, &mut result))?;
+        let [p0, p1] = result.assume_init();
+        Ok((p0, p1))
+    }
+}
+
+#[inline]
+pub(crate) fn pipe_with(flags: PipeFlags) -> io::Result<(OwnedFd, OwnedFd)> {
+    unsafe {
+        let mut result = MaybeUninit::<[OwnedFd; 2]>::uninit();
+        ret(syscall!(__NR_pipe2, &mut result, flags))?;
+        let [p0, p1] = result.assume_init();
+        Ok((p0, p1))
+    }
+}
+
+#[inline]
+pub fn splice(
+    fd_in: BorrowedFd<'_>,
+    off_in: Option<&mut u64>,
+    fd_out: BorrowedFd<'_>,
+    off_out: Option<&mut u64>,
+    len: usize,
+    flags: SpliceFlags,
+) -> io::Result<usize> {
+    unsafe {
+        ret_usize(syscall!(
+            __NR_splice,
+            fd_in,
+            opt_mut(off_in),
+            fd_out,
+            opt_mut(off_out),
+            pass_usize(len),
+            flags
+        ))
+    }
+}
+
+#[inline]
+pub unsafe fn vmsplice(
+    fd: BorrowedFd<'_>,
+    bufs: &[IoSliceRaw<'_>],
+    flags: SpliceFlags,
+) -> io::Result<usize> {
+    let (bufs_addr, bufs_len) = slice(&bufs[..cmp::min(bufs.len(), MAX_IOV)]);
+    ret_usize(syscall!(__NR_vmsplice, fd, bufs_addr, bufs_len, flags))
+}
+
+#[inline]
+pub fn tee(
+    fd_in: BorrowedFd<'_>,
+    fd_out: BorrowedFd<'_>,
+    len: usize,
+    flags: SpliceFlags,
+) -> io::Result<usize> {
+    unsafe { ret_usize(syscall!(__NR_tee, fd_in, fd_out, pass_usize(len), flags)) }
+}
+
+#[inline]
+pub(crate) fn fcntl_getpipe_sz(fd: BorrowedFd<'_>) -> io::Result<usize> {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret_usize(syscall_readonly!(__NR_fcntl64, fd, c_uint(F_GETPIPE_SZ)))
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret_usize(syscall_readonly!(__NR_fcntl, fd, c_uint(F_GETPIPE_SZ)))
+    }
+}
+
+#[inline]
+pub(crate) fn fcntl_setpipe_sz(fd: BorrowedFd<'_>, size: usize) -> io::Result<()> {
+    let size: c::c_int = size.try_into().map_err(|_| io::Errno::PERM)?;
+
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fcntl64,
+            fd,
+            c_uint(F_SETPIPE_SZ),
+            c_int(size)
+        ))
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_fcntl,
+            fd,
+            c_uint(F_SETPIPE_SZ),
+            c_int(size)
+        ))
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/pipe/types.rs b/vendor/rustix/src/backend/linux_raw/pipe/types.rs
new file mode 100644
index 0000000..2d1ed9a
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/pipe/types.rs
@@ -0,0 +1,80 @@
+use crate::backend::c;
+use bitflags::bitflags;
+use core::marker::PhantomData;
+
+bitflags! {
+    /// `O_*` constants for use with [`pipe_with`].
+    ///
+    /// [`pipe_with`]: crate::pipe::pipe_with
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct PipeFlags: c::c_uint {
+        /// `O_CLOEXEC`
+        const CLOEXEC = linux_raw_sys::general::O_CLOEXEC;
+        /// `O_DIRECT`
+        const DIRECT = linux_raw_sys::general::O_DIRECT;
+        /// `O_NONBLOCK`
+        const NONBLOCK = linux_raw_sys::general::O_NONBLOCK;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `SPLICE_F_*` constants for use with [`splice`], [`vmsplice`], and
+    /// [`tee`].
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct SpliceFlags: c::c_uint {
+        /// `SPLICE_F_MOVE`
+        const MOVE = linux_raw_sys::general::SPLICE_F_MOVE;
+        /// `SPLICE_F_NONBLOCK`
+        const NONBLOCK = linux_raw_sys::general::SPLICE_F_NONBLOCK;
+        /// `SPLICE_F_MORE`
+        const MORE = linux_raw_sys::general::SPLICE_F_MORE;
+        /// `SPLICE_F_GIFT`
+        const GIFT = linux_raw_sys::general::SPLICE_F_GIFT;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// A buffer type for use with [`vmsplice`].
+///
+/// It is guaranteed to be ABI compatible with the iovec type on Unix platforms
+/// and `WSABUF` on Windows. Unlike `IoSlice` and `IoSliceMut` it is
+/// semantically like a raw pointer, and therefore can be shared or mutated as
+/// needed.
+///
+/// [`vmsplice`]: crate::pipe::vmsplice
+#[repr(transparent)]
+pub struct IoSliceRaw<'a> {
+    _buf: c::iovec,
+    _lifetime: PhantomData<&'a ()>,
+}
+
+impl<'a> IoSliceRaw<'a> {
+    /// Creates a new `IoSlice` wrapping a byte slice.
+    pub fn from_slice(buf: &'a [u8]) -> Self {
+        IoSliceRaw {
+            _buf: c::iovec {
+                iov_base: (buf.as_ptr() as *mut u8).cast::<c::c_void>(),
+                iov_len: buf.len() as _,
+            },
+            _lifetime: PhantomData,
+        }
+    }
+
+    /// Creates a new `IoSlice` wrapping a mutable byte slice.
+    pub fn from_slice_mut(buf: &'a mut [u8]) -> Self {
+        IoSliceRaw {
+            _buf: c::iovec {
+                iov_base: buf.as_mut_ptr().cast::<c::c_void>(),
+                iov_len: buf.len() as _,
+            },
+            _lifetime: PhantomData,
+        }
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/prctl/mod.rs b/vendor/rustix/src/backend/linux_raw/prctl/mod.rs
new file mode 100644
index 0000000..ef944f0
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/prctl/mod.rs
@@ -0,0 +1 @@
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/linux_raw/prctl/syscalls.rs b/vendor/rustix/src/backend/linux_raw/prctl/syscalls.rs
new file mode 100644
index 0000000..1410d51
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/prctl/syscalls.rs
@@ -0,0 +1,21 @@
+//! linux_raw syscalls supporting modules that use `prctl`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::c;
+use crate::backend::conv::{c_int, ret_c_int};
+use crate::io;
+
+#[inline]
+pub(crate) unsafe fn prctl(
+    option: c::c_int,
+    arg2: *mut c::c_void,
+    arg3: *mut c::c_void,
+    arg4: *mut c::c_void,
+    arg5: *mut c::c_void,
+) -> io::Result<c::c_int> {
+    ret_c_int(syscall!(__NR_prctl, c_int(option), arg2, arg3, arg4, arg5))
+}
diff --git a/vendor/rustix/src/backend/linux_raw/process/cpu_set.rs b/vendor/rustix/src/backend/linux_raw/process/cpu_set.rs
new file mode 100644
index 0000000..35146cf
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/process/cpu_set.rs
@@ -0,0 +1,46 @@
+//! Rust implementation of the `CPU_*` macro API.
+
+#![allow(non_snake_case)]
+
+use super::types::RawCpuSet;
+use core::mem::size_of_val;
+
+#[inline]
+pub(crate) fn CPU_SET(cpu: usize, cpuset: &mut RawCpuSet) {
+    let size_in_bits = 8 * size_of_val(&cpuset.bits[0]); // 32, 64 etc
+    let (idx, offset) = (cpu / size_in_bits, cpu % size_in_bits);
+    cpuset.bits[idx] |= 1 << offset
+}
+
+#[inline]
+pub(crate) fn CPU_ZERO(cpuset: &mut RawCpuSet) {
+    cpuset.bits.fill(0)
+}
+
+#[inline]
+pub(crate) fn CPU_CLR(cpu: usize, cpuset: &mut RawCpuSet) {
+    let size_in_bits = 8 * size_of_val(&cpuset.bits[0]); // 32, 64 etc
+    let (idx, offset) = (cpu / size_in_bits, cpu % size_in_bits);
+    cpuset.bits[idx] &= !(1 << offset)
+}
+
+#[inline]
+pub(crate) fn CPU_ISSET(cpu: usize, cpuset: &RawCpuSet) -> bool {
+    let size_in_bits = 8 * size_of_val(&cpuset.bits[0]);
+    let (idx, offset) = (cpu / size_in_bits, cpu % size_in_bits);
+    (cpuset.bits[idx] & (1 << offset)) != 0
+}
+
+#[inline]
+pub(crate) fn CPU_COUNT_S(size_in_bytes: usize, cpuset: &RawCpuSet) -> u32 {
+    let size_of_mask = size_of_val(&cpuset.bits[0]);
+    let idx = size_in_bytes / size_of_mask;
+    cpuset.bits[..idx]
+        .iter()
+        .fold(0, |acc, i| acc + i.count_ones())
+}
+
+#[inline]
+pub(crate) fn CPU_COUNT(cpuset: &RawCpuSet) -> u32 {
+    CPU_COUNT_S(core::mem::size_of::<RawCpuSet>(), cpuset)
+}
diff --git a/vendor/rustix/src/backend/linux_raw/process/mod.rs b/vendor/rustix/src/backend/linux_raw/process/mod.rs
new file mode 100644
index 0000000..9b2c25f
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/process/mod.rs
@@ -0,0 +1,4 @@
+pub(crate) mod cpu_set;
+pub(crate) mod syscalls;
+pub(crate) mod types;
+pub(crate) mod wait;
diff --git a/vendor/rustix/src/backend/linux_raw/process/syscalls.rs b/vendor/rustix/src/backend/linux_raw/process/syscalls.rs
new file mode 100644
index 0000000..bc00af9
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/process/syscalls.rs
@@ -0,0 +1,603 @@
+//! linux_raw syscalls supporting `rustix::process`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use super::types::RawCpuSet;
+use crate::backend::c;
+#[cfg(all(feature = "alloc", feature = "fs"))]
+use crate::backend::conv::slice_mut;
+use crate::backend::conv::{
+    by_mut, by_ref, c_int, c_uint, negative_pid, pass_usize, raw_fd, ret, ret_c_int,
+    ret_c_int_infallible, ret_c_uint, ret_infallible, ret_owned_fd, ret_usize, size_of,
+    slice_just_addr, zero,
+};
+use crate::fd::{AsRawFd, BorrowedFd, OwnedFd, RawFd};
+#[cfg(feature = "fs")]
+use crate::ffi::CStr;
+use crate::io;
+use crate::pid::RawPid;
+use crate::process::{
+    Cpuid, MembarrierCommand, MembarrierQuery, Pid, PidfdFlags, PidfdGetfdFlags, Resource, Rlimit,
+    Uid, WaitId, WaitOptions, WaitStatus, WaitidOptions, WaitidStatus,
+};
+use crate::signal::Signal;
+use crate::utils::as_mut_ptr;
+use core::mem::MaybeUninit;
+use core::ptr::{null, null_mut};
+use linux_raw_sys::general::{
+    membarrier_cmd, membarrier_cmd_flag, rlimit64, PRIO_PGRP, PRIO_PROCESS, PRIO_USER,
+    RLIM64_INFINITY,
+};
+#[cfg(feature = "fs")]
+use {crate::backend::conv::ret_c_uint_infallible, crate::fs::Mode};
+#[cfg(feature = "alloc")]
+use {crate::backend::conv::slice_just_addr_mut, crate::process::Gid};
+
+// `sched_getcpu` has special optimizations via the vDSO on some architectures.
+#[cfg(any(
+    target_arch = "x86_64",
+    target_arch = "x86",
+    target_arch = "riscv64",
+    target_arch = "powerpc64"
+))]
+pub(crate) use crate::backend::vdso_wrappers::sched_getcpu;
+
+// `sched_getcpu` on platforms without a vDSO entry for it.
+#[cfg(not(any(
+    target_arch = "x86_64",
+    target_arch = "x86",
+    target_arch = "riscv64",
+    target_arch = "powerpc64"
+)))]
+#[inline]
+pub(crate) fn sched_getcpu() -> usize {
+    let mut cpu = MaybeUninit::<u32>::uninit();
+    unsafe {
+        let r = ret(syscall!(__NR_getcpu, &mut cpu, zero(), zero()));
+        debug_assert!(r.is_ok());
+        cpu.assume_init() as usize
+    }
+}
+
+#[cfg(feature = "fs")]
+#[inline]
+pub(crate) fn chdir(filename: &CStr) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_chdir, filename)) }
+}
+
+#[inline]
+pub(crate) fn fchdir(fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_fchdir, fd)) }
+}
+
+#[cfg(feature = "fs")]
+#[inline]
+pub(crate) fn chroot(filename: &CStr) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_chroot, filename)) }
+}
+
+#[cfg(all(feature = "alloc", feature = "fs"))]
+#[inline]
+pub(crate) fn getcwd(buf: &mut [MaybeUninit<u8>]) -> io::Result<usize> {
+    let (buf_addr_mut, buf_len) = slice_mut(buf);
+    unsafe { ret_usize(syscall!(__NR_getcwd, buf_addr_mut, buf_len)) }
+}
+
+#[inline]
+pub(crate) fn membarrier_query() -> MembarrierQuery {
+    unsafe {
+        match ret_c_uint(syscall!(
+            __NR_membarrier,
+            c_int(membarrier_cmd::MEMBARRIER_CMD_QUERY as _),
+            c_uint(0)
+        )) {
+            Ok(query) => MembarrierQuery::from_bits_retain(query),
+            Err(_) => MembarrierQuery::empty(),
+        }
+    }
+}
+
+#[inline]
+pub(crate) fn membarrier(cmd: MembarrierCommand) -> io::Result<()> {
+    unsafe { ret(syscall!(__NR_membarrier, cmd, c_uint(0))) }
+}
+
+#[inline]
+pub(crate) fn membarrier_cpu(cmd: MembarrierCommand, cpu: Cpuid) -> io::Result<()> {
+    unsafe {
+        ret(syscall!(
+            __NR_membarrier,
+            cmd,
+            c_uint(membarrier_cmd_flag::MEMBARRIER_CMD_FLAG_CPU as _),
+            cpu
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn getppid() -> Option<Pid> {
+    unsafe {
+        let ppid = ret_c_int_infallible(syscall_readonly!(__NR_getppid));
+        Pid::from_raw(ppid)
+    }
+}
+
+#[inline]
+pub(crate) fn getpgid(pid: Option<Pid>) -> io::Result<Pid> {
+    unsafe {
+        let pgid = ret_c_int(syscall_readonly!(__NR_getpgid, c_int(Pid::as_raw(pid))))?;
+        debug_assert!(pgid > 0);
+        Ok(Pid::from_raw_unchecked(pgid))
+    }
+}
+
+#[inline]
+pub(crate) fn setpgid(pid: Option<Pid>, pgid: Option<Pid>) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_setpgid,
+            c_int(Pid::as_raw(pid)),
+            c_int(Pid::as_raw(pgid))
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn getpgrp() -> Pid {
+    // Use the `getpgrp` syscall if available.
+    #[cfg(not(any(target_arch = "aarch64", target_arch = "riscv64")))]
+    unsafe {
+        let pgid = ret_c_int_infallible(syscall_readonly!(__NR_getpgrp));
+        debug_assert!(pgid > 0);
+        Pid::from_raw_unchecked(pgid)
+    }
+
+    // Otherwise use `getpgrp` and pass it zero.
+    #[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))]
+    unsafe {
+        let pgid = ret_c_int_infallible(syscall_readonly!(__NR_getpgid, c_uint(0)));
+        debug_assert!(pgid > 0);
+        Pid::from_raw_unchecked(pgid)
+    }
+}
+
+#[inline]
+pub(crate) fn sched_getaffinity(pid: Option<Pid>, cpuset: &mut RawCpuSet) -> io::Result<()> {
+    unsafe {
+        // The raw Linux syscall returns the size (in bytes) of the `cpumask_t`
+        // data type that is used internally by the kernel to represent the CPU
+        // set bit mask.
+        let size = ret_usize(syscall!(
+            __NR_sched_getaffinity,
+            c_int(Pid::as_raw(pid)),
+            size_of::<RawCpuSet, _>(),
+            by_mut(&mut cpuset.bits)
+        ))?;
+        let bytes = as_mut_ptr(cpuset).cast::<u8>();
+        let rest = bytes.wrapping_add(size);
+        // Zero every byte in the cpuset not set by the kernel.
+        rest.write_bytes(0, core::mem::size_of::<RawCpuSet>() - size);
+        Ok(())
+    }
+}
+
+#[inline]
+pub(crate) fn sched_setaffinity(pid: Option<Pid>, cpuset: &RawCpuSet) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_sched_setaffinity,
+            c_int(Pid::as_raw(pid)),
+            size_of::<RawCpuSet, _>(),
+            slice_just_addr(&cpuset.bits)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn sched_yield() {
+    unsafe {
+        // See the documentation for [`crate::process::sched_yield`] for why
+        // errors are ignored.
+        syscall_readonly!(__NR_sched_yield).decode_void();
+    }
+}
+
+#[cfg(feature = "fs")]
+#[inline]
+pub(crate) fn umask(mode: Mode) -> Mode {
+    unsafe { Mode::from_bits_retain(ret_c_uint_infallible(syscall_readonly!(__NR_umask, mode))) }
+}
+
+#[inline]
+pub(crate) fn nice(inc: i32) -> io::Result<i32> {
+    let priority = (if inc > -40 && inc < 40 {
+        inc + getpriority_process(None)?
+    } else {
+        inc
+    })
+    .clamp(-20, 19);
+    setpriority_process(None, priority)?;
+    Ok(priority)
+}
+
+#[inline]
+pub(crate) fn getpriority_user(uid: Uid) -> io::Result<i32> {
+    unsafe {
+        Ok(20
+            - ret_c_int(syscall_readonly!(
+                __NR_getpriority,
+                c_uint(PRIO_USER),
+                c_uint(uid.as_raw())
+            ))?)
+    }
+}
+
+#[inline]
+pub(crate) fn getpriority_pgrp(pgid: Option<Pid>) -> io::Result<i32> {
+    unsafe {
+        Ok(20
+            - ret_c_int(syscall_readonly!(
+                __NR_getpriority,
+                c_uint(PRIO_PGRP),
+                c_int(Pid::as_raw(pgid))
+            ))?)
+    }
+}
+
+#[inline]
+pub(crate) fn getpriority_process(pid: Option<Pid>) -> io::Result<i32> {
+    unsafe {
+        Ok(20
+            - ret_c_int(syscall_readonly!(
+                __NR_getpriority,
+                c_uint(PRIO_PROCESS),
+                c_int(Pid::as_raw(pid))
+            ))?)
+    }
+}
+
+#[inline]
+pub(crate) fn setpriority_user(uid: Uid, priority: i32) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_setpriority,
+            c_uint(PRIO_USER),
+            c_uint(uid.as_raw()),
+            c_int(priority)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn setpriority_pgrp(pgid: Option<Pid>, priority: i32) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_setpriority,
+            c_uint(PRIO_PGRP),
+            c_int(Pid::as_raw(pgid)),
+            c_int(priority)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn setpriority_process(pid: Option<Pid>, priority: i32) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_setpriority,
+            c_uint(PRIO_PROCESS),
+            c_int(Pid::as_raw(pid)),
+            c_int(priority)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn getrlimit(limit: Resource) -> Rlimit {
+    let mut result = MaybeUninit::<rlimit64>::uninit();
+    unsafe {
+        ret_infallible(syscall!(
+            __NR_prlimit64,
+            c_uint(0),
+            limit,
+            null::<c::c_void>(),
+            &mut result
+        ));
+        rlimit_from_linux(result.assume_init())
+    }
+}
+
+#[inline]
+pub(crate) fn setrlimit(limit: Resource, new: Rlimit) -> io::Result<()> {
+    unsafe {
+        let lim = rlimit_to_linux(new.clone());
+        match ret(syscall_readonly!(
+            __NR_prlimit64,
+            c_uint(0),
+            limit,
+            by_ref(&lim),
+            null_mut::<c::c_void>()
+        )) {
+            Ok(()) => Ok(()),
+            Err(err) => Err(err),
+        }
+    }
+}
+
+#[inline]
+pub(crate) fn prlimit(pid: Option<Pid>, limit: Resource, new: Rlimit) -> io::Result<Rlimit> {
+    let lim = rlimit_to_linux(new);
+    let mut result = MaybeUninit::<rlimit64>::uninit();
+    unsafe {
+        match ret(syscall!(
+            __NR_prlimit64,
+            c_int(Pid::as_raw(pid)),
+            limit,
+            by_ref(&lim),
+            &mut result
+        )) {
+            Ok(()) => Ok(rlimit_from_linux(result.assume_init())),
+            Err(err) => Err(err),
+        }
+    }
+}
+
+/// Convert a Rust [`Rlimit`] to a C `rlimit64`.
+#[inline]
+fn rlimit_from_linux(lim: rlimit64) -> Rlimit {
+    let current = if lim.rlim_cur == RLIM64_INFINITY as _ {
+        None
+    } else {
+        Some(lim.rlim_cur)
+    };
+    let maximum = if lim.rlim_max == RLIM64_INFINITY as _ {
+        None
+    } else {
+        Some(lim.rlim_max)
+    };
+    Rlimit { current, maximum }
+}
+
+/// Convert a C `rlimit64` to a Rust `Rlimit`.
+#[inline]
+fn rlimit_to_linux(lim: Rlimit) -> rlimit64 {
+    let rlim_cur = match lim.current {
+        Some(r) => r,
+        None => RLIM64_INFINITY as _,
+    };
+    let rlim_max = match lim.maximum {
+        Some(r) => r,
+        None => RLIM64_INFINITY as _,
+    };
+    rlimit64 { rlim_cur, rlim_max }
+}
+
+#[inline]
+pub(crate) fn wait(waitopts: WaitOptions) -> io::Result<Option<(Pid, WaitStatus)>> {
+    _waitpid(!0, waitopts)
+}
+
+#[inline]
+pub(crate) fn waitpid(
+    pid: Option<Pid>,
+    waitopts: WaitOptions,
+) -> io::Result<Option<(Pid, WaitStatus)>> {
+    _waitpid(Pid::as_raw(pid), waitopts)
+}
+
+#[inline]
+pub(crate) fn waitpgid(pgid: Pid, waitopts: WaitOptions) -> io::Result<Option<(Pid, WaitStatus)>> {
+    _waitpid(-pgid.as_raw_nonzero().get(), waitopts)
+}
+
+#[inline]
+pub(crate) fn _waitpid(
+    pid: RawPid,
+    waitopts: WaitOptions,
+) -> io::Result<Option<(Pid, WaitStatus)>> {
+    unsafe {
+        let mut status = MaybeUninit::<u32>::uninit();
+        let pid = ret_c_int(syscall!(
+            __NR_wait4,
+            c_int(pid as _),
+            &mut status,
+            c_int(waitopts.bits() as _),
+            zero()
+        ))?;
+        Ok(Pid::from_raw(pid).map(|pid| (pid, WaitStatus::new(status.assume_init()))))
+    }
+}
+
+#[inline]
+pub(crate) fn waitid(id: WaitId<'_>, options: WaitidOptions) -> io::Result<Option<WaitidStatus>> {
+    // Get the id to wait on.
+    match id {
+        WaitId::All => _waitid_all(options),
+        WaitId::Pid(pid) => _waitid_pid(pid, options),
+        WaitId::Pgid(pid) => _waitid_pgid(pid, options),
+        WaitId::PidFd(fd) => _waitid_pidfd(fd, options),
+    }
+}
+
+#[inline]
+fn _waitid_all(options: WaitidOptions) -> io::Result<Option<WaitidStatus>> {
+    // `waitid` can return successfully without initializing the struct (no
+    // children found when using `WNOHANG`)
+    let mut status = MaybeUninit::<c::siginfo_t>::zeroed();
+    unsafe {
+        ret(syscall!(
+            __NR_waitid,
+            c_uint(c::P_ALL),
+            c_uint(0),
+            by_mut(&mut status),
+            c_int(options.bits() as _),
+            zero()
+        ))?
+    };
+
+    Ok(unsafe { cvt_waitid_status(status) })
+}
+
+#[inline]
+fn _waitid_pid(pid: Pid, options: WaitidOptions) -> io::Result<Option<WaitidStatus>> {
+    // `waitid` can return successfully without initializing the struct (no
+    // children found when using `WNOHANG`)
+    let mut status = MaybeUninit::<c::siginfo_t>::zeroed();
+    unsafe {
+        ret(syscall!(
+            __NR_waitid,
+            c_uint(c::P_PID),
+            c_int(Pid::as_raw(Some(pid))),
+            by_mut(&mut status),
+            c_int(options.bits() as _),
+            zero()
+        ))?
+    };
+
+    Ok(unsafe { cvt_waitid_status(status) })
+}
+
+#[inline]
+fn _waitid_pgid(pgid: Option<Pid>, options: WaitidOptions) -> io::Result<Option<WaitidStatus>> {
+    // `waitid` can return successfully without initializing the struct (no
+    // children found when using `WNOHANG`)
+    let mut status = MaybeUninit::<c::siginfo_t>::zeroed();
+    unsafe {
+        ret(syscall!(
+            __NR_waitid,
+            c_uint(c::P_PGID),
+            c_int(Pid::as_raw(pgid)),
+            by_mut(&mut status),
+            c_int(options.bits() as _),
+            zero()
+        ))?
+    };
+
+    Ok(unsafe { cvt_waitid_status(status) })
+}
+
+#[inline]
+fn _waitid_pidfd(fd: BorrowedFd<'_>, options: WaitidOptions) -> io::Result<Option<WaitidStatus>> {
+    // `waitid` can return successfully without initializing the struct (no
+    // children found when using `WNOHANG`)
+    let mut status = MaybeUninit::<c::siginfo_t>::zeroed();
+    unsafe {
+        ret(syscall!(
+            __NR_waitid,
+            c_uint(c::P_PIDFD),
+            c_uint(fd.as_raw_fd() as _),
+            by_mut(&mut status),
+            c_int(options.bits() as _),
+            zero()
+        ))?
+    };
+
+    Ok(unsafe { cvt_waitid_status(status) })
+}
+
+/// Convert a `siginfo_t` to a `WaitidStatus`.
+///
+/// # Safety
+///
+/// The caller must ensure that `status` is initialized and that `waitid`
+/// returned successfully.
+#[inline]
+#[rustfmt::skip]
+unsafe fn cvt_waitid_status(status: MaybeUninit<c::siginfo_t>) -> Option<WaitidStatus> {
+    let status = status.assume_init();
+    if status.__bindgen_anon_1.__bindgen_anon_1._sifields._sigchld._pid == 0 {
+        None
+    } else {
+        Some(WaitidStatus(status))
+    }
+}
+
+#[inline]
+pub(crate) fn getsid(pid: Option<Pid>) -> io::Result<Pid> {
+    unsafe {
+        let pid = ret_c_int(syscall_readonly!(__NR_getsid, c_int(Pid::as_raw(pid))))?;
+        Ok(Pid::from_raw_unchecked(pid))
+    }
+}
+
+#[inline]
+pub(crate) fn setsid() -> io::Result<Pid> {
+    unsafe {
+        let pid = ret_c_int(syscall_readonly!(__NR_setsid))?;
+        Ok(Pid::from_raw_unchecked(pid))
+    }
+}
+
+#[inline]
+pub(crate) fn kill_process(pid: Pid, sig: Signal) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_kill, pid, sig)) }
+}
+
+#[inline]
+pub(crate) fn kill_process_group(pid: Pid, sig: Signal) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_kill, negative_pid(pid), sig)) }
+}
+
+#[inline]
+pub(crate) fn kill_current_process_group(sig: Signal) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_kill, pass_usize(0), sig)) }
+}
+
+#[inline]
+pub(crate) fn test_kill_process(pid: Pid) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_kill, pid, pass_usize(0))) }
+}
+
+#[inline]
+pub(crate) fn test_kill_process_group(pid: Pid) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_kill,
+            negative_pid(pid),
+            pass_usize(0)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn test_kill_current_process_group() -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_kill, pass_usize(0), pass_usize(0))) }
+}
+
+#[inline]
+pub(crate) fn pidfd_getfd(
+    pidfd: BorrowedFd<'_>,
+    targetfd: RawFd,
+    flags: PidfdGetfdFlags,
+) -> io::Result<OwnedFd> {
+    unsafe {
+        ret_owned_fd(syscall_readonly!(
+            __NR_pidfd_getfd,
+            pidfd,
+            raw_fd(targetfd),
+            c_int(flags.bits() as _)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn pidfd_open(pid: Pid, flags: PidfdFlags) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(syscall_readonly!(__NR_pidfd_open, pid, flags)) }
+}
+
+#[cfg(feature = "alloc")]
+#[inline]
+pub(crate) fn getgroups(buf: &mut [Gid]) -> io::Result<usize> {
+    let len = buf.len().try_into().map_err(|_| io::Errno::NOMEM)?;
+
+    unsafe {
+        ret_usize(syscall!(
+            __NR_getgroups,
+            c_int(len),
+            slice_just_addr_mut(buf)
+        ))
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/process/types.rs b/vendor/rustix/src/backend/linux_raw/process/types.rs
new file mode 100644
index 0000000..841668a
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/process/types.rs
@@ -0,0 +1,104 @@
+use linux_raw_sys::general::membarrier_cmd;
+
+/// A command for use with [`membarrier`] and [`membarrier_cpu`].
+///
+/// For `MEMBARRIER_CMD_QUERY`, see [`membarrier_query`].
+///
+/// [`membarrier`]: crate::process::membarrier
+/// [`membarrier_cpu`]: crate::process::membarrier_cpu
+/// [`membarrier_query`]: crate::process::membarrier_query
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
+#[repr(u32)]
+pub enum MembarrierCommand {
+    /// `MEMBARRIER_CMD_GLOBAL`
+    #[doc(alias = "Shared")]
+    #[doc(alias = "MEMBARRIER_CMD_SHARED")]
+    Global = membarrier_cmd::MEMBARRIER_CMD_GLOBAL as _,
+    /// `MEMBARRIER_CMD_GLOBAL_EXPEDITED`
+    GlobalExpedited = membarrier_cmd::MEMBARRIER_CMD_GLOBAL_EXPEDITED as _,
+    /// `MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED`
+    RegisterGlobalExpedited = membarrier_cmd::MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED as _,
+    /// `MEMBARRIER_CMD_PRIVATE_EXPEDITED`
+    PrivateExpedited = membarrier_cmd::MEMBARRIER_CMD_PRIVATE_EXPEDITED as _,
+    /// `MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED`
+    RegisterPrivateExpedited = membarrier_cmd::MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED as _,
+    /// `MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE`
+    PrivateExpeditedSyncCore = membarrier_cmd::MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE as _,
+    /// `MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE`
+    RegisterPrivateExpeditedSyncCore =
+        membarrier_cmd::MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE as _,
+    /// `MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ` (since Linux 5.10)
+    PrivateExpeditedRseq = membarrier_cmd::MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ as _,
+    /// `MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_RSEQ` (since Linux 5.10)
+    RegisterPrivateExpeditedRseq =
+        membarrier_cmd::MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_RSEQ as _,
+}
+
+/// A resource value for use with [`getrlimit`], [`setrlimit`], and
+/// [`prlimit`].
+///
+/// [`getrlimit`]: crate::process::getrlimit
+/// [`setrlimit`]: crate::process::setrlimit
+/// [`prlimit`]: crate::process::prlimit
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(u32)]
+pub enum Resource {
+    /// `RLIMIT_CPU`
+    Cpu = linux_raw_sys::general::RLIMIT_CPU,
+    /// `RLIMIT_FSIZE`
+    Fsize = linux_raw_sys::general::RLIMIT_FSIZE,
+    /// `RLIMIT_DATA`
+    Data = linux_raw_sys::general::RLIMIT_DATA,
+    /// `RLIMIT_STACK`
+    Stack = linux_raw_sys::general::RLIMIT_STACK,
+    /// `RLIMIT_CORE`
+    Core = linux_raw_sys::general::RLIMIT_CORE,
+    /// `RLIMIT_RSS`
+    Rss = linux_raw_sys::general::RLIMIT_RSS,
+    /// `RLIMIT_NPROC`
+    Nproc = linux_raw_sys::general::RLIMIT_NPROC,
+    /// `RLIMIT_NOFILE`
+    Nofile = linux_raw_sys::general::RLIMIT_NOFILE,
+    /// `RLIMIT_MEMLOCK`
+    Memlock = linux_raw_sys::general::RLIMIT_MEMLOCK,
+    /// `RLIMIT_AS`
+    As = linux_raw_sys::general::RLIMIT_AS,
+    /// `RLIMIT_LOCKS`
+    Locks = linux_raw_sys::general::RLIMIT_LOCKS,
+    /// `RLIMIT_SIGPENDING`
+    Sigpending = linux_raw_sys::general::RLIMIT_SIGPENDING,
+    /// `RLIMIT_MSGQUEUE`
+    Msgqueue = linux_raw_sys::general::RLIMIT_MSGQUEUE,
+    /// `RLIMIT_NICE`
+    Nice = linux_raw_sys::general::RLIMIT_NICE,
+    /// `RLIMIT_RTPRIO`
+    Rtprio = linux_raw_sys::general::RLIMIT_RTPRIO,
+    /// `RLIMIT_RTTIME`
+    Rttime = linux_raw_sys::general::RLIMIT_RTTIME,
+}
+
+/// A CPU identifier as a raw integer.
+pub type RawCpuid = u32;
+
+#[repr(C)]
+#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
+pub(crate) struct RawCpuSet {
+    #[cfg(all(target_pointer_width = "32", not(target_arch = "x86_64")))]
+    pub(crate) bits: [u32; 32],
+    #[cfg(not(all(target_pointer_width = "32", not(target_arch = "x86_64"))))]
+    pub(crate) bits: [u64; 16],
+}
+
+#[inline]
+pub(crate) fn raw_cpu_set_new() -> RawCpuSet {
+    #[cfg(all(target_pointer_width = "32", not(target_arch = "x86_64")))]
+    {
+        RawCpuSet { bits: [0; 32] }
+    }
+    #[cfg(not(all(target_pointer_width = "32", not(target_arch = "x86_64"))))]
+    {
+        RawCpuSet { bits: [0; 16] }
+    }
+}
+
+pub(crate) const CPU_SETSIZE: usize = 8 * core::mem::size_of::<RawCpuSet>();
diff --git a/vendor/rustix/src/backend/linux_raw/process/wait.rs b/vendor/rustix/src/backend/linux_raw/process/wait.rs
new file mode 100644
index 0000000..9af7f2b
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/process/wait.rs
@@ -0,0 +1,68 @@
+// The functions replacing the C macros use the same names as in libc.
+#![allow(non_snake_case, unsafe_code)]
+
+use linux_raw_sys::ctypes::c_int;
+pub(crate) use linux_raw_sys::general::{
+    siginfo_t, WCONTINUED, WEXITED, WNOHANG, WNOWAIT, WSTOPPED, WUNTRACED,
+};
+
+#[inline]
+pub(crate) fn WIFSTOPPED(status: u32) -> bool {
+    (status & 0xff) == 0x7f
+}
+
+#[inline]
+pub(crate) fn WSTOPSIG(status: u32) -> u32 {
+    (status >> 8) & 0xff
+}
+
+#[inline]
+pub(crate) fn WIFCONTINUED(status: u32) -> bool {
+    status == 0xffff
+}
+
+#[inline]
+pub(crate) fn WIFSIGNALED(status: u32) -> bool {
+    ((status & 0x7f) + 1) as i8 >= 2
+}
+
+#[inline]
+pub(crate) fn WTERMSIG(status: u32) -> u32 {
+    status & 0x7f
+}
+
+#[inline]
+pub(crate) fn WIFEXITED(status: u32) -> bool {
+    (status & 0x7f) == 0
+}
+
+#[inline]
+pub(crate) fn WEXITSTATUS(status: u32) -> u32 {
+    (status >> 8) & 0xff
+}
+
+pub(crate) trait SiginfoExt {
+    fn si_code(&self) -> c_int;
+    unsafe fn si_status(&self) -> c_int;
+}
+
+impl SiginfoExt for siginfo_t {
+    #[inline]
+    fn si_code(&self) -> c_int {
+        // SAFETY: This is technically a union access, but it's only a union
+        // with padding.
+        unsafe { self.__bindgen_anon_1.__bindgen_anon_1.si_code }
+    }
+
+    /// Return the exit status or signal number recorded in a `siginfo_t`.
+    ///
+    /// # Safety
+    ///
+    /// `si_signo` must equal `SIGCHLD` (as it is guaranteed to do after a
+    /// `waitid` call).
+    #[inline]
+    #[rustfmt::skip]
+    unsafe fn si_status(&self) -> c_int {
+        self.__bindgen_anon_1.__bindgen_anon_1._sifields._sigchld._status
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/pty/mod.rs b/vendor/rustix/src/backend/linux_raw/pty/mod.rs
new file mode 100644
index 0000000..ef944f0
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/pty/mod.rs
@@ -0,0 +1 @@
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/linux_raw/pty/syscalls.rs b/vendor/rustix/src/backend/linux_raw/pty/syscalls.rs
new file mode 100644
index 0000000..b64344f
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/pty/syscalls.rs
@@ -0,0 +1,43 @@
+//! linux_raw syscalls supporting `rustix::pty`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::conv::{by_ref, c_uint, ret};
+use crate::fd::BorrowedFd;
+use crate::io;
+use linux_raw_sys::ioctl::TIOCSPTLCK;
+#[cfg(feature = "alloc")]
+use {
+    crate::backend::c, crate::ffi::CString, crate::path::DecInt, alloc::vec::Vec,
+    core::mem::MaybeUninit, linux_raw_sys::ioctl::TIOCGPTN,
+};
+
+#[cfg(feature = "alloc")]
+#[inline]
+pub(crate) fn ptsname(fd: BorrowedFd<'_>, mut buffer: Vec<u8>) -> io::Result<CString> {
+    unsafe {
+        let mut n = MaybeUninit::<c::c_int>::uninit();
+        ret(syscall!(__NR_ioctl, fd, c_uint(TIOCGPTN), &mut n))?;
+
+        buffer.clear();
+        buffer.extend_from_slice(b"/dev/pts/");
+        buffer.extend_from_slice(DecInt::new(n.assume_init()).as_bytes());
+        buffer.push(b'\0');
+        Ok(CString::from_vec_with_nul_unchecked(buffer))
+    }
+}
+
+#[inline]
+pub(crate) fn unlockpt(fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_ioctl,
+            fd,
+            c_uint(TIOCSPTLCK),
+            by_ref(&0)
+        ))
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/rand/mod.rs b/vendor/rustix/src/backend/linux_raw/rand/mod.rs
new file mode 100644
index 0000000..1e0181a
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/rand/mod.rs
@@ -0,0 +1,2 @@
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/linux_raw/rand/syscalls.rs b/vendor/rustix/src/backend/linux_raw/rand/syscalls.rs
new file mode 100644
index 0000000..c0f497b
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/rand/syscalls.rs
@@ -0,0 +1,19 @@
+//! linux_raw syscalls supporting `rustix::rand`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::conv::{pass_usize, ret_usize};
+use crate::io;
+use crate::rand::GetRandomFlags;
+
+#[inline]
+pub(crate) unsafe fn getrandom(
+    buf: *mut u8,
+    cap: usize,
+    flags: GetRandomFlags,
+) -> io::Result<usize> {
+    ret_usize(syscall!(__NR_getrandom, buf, pass_usize(cap), flags))
+}
diff --git a/vendor/rustix/src/backend/linux_raw/rand/types.rs b/vendor/rustix/src/backend/linux_raw/rand/types.rs
new file mode 100644
index 0000000..9bc857f
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/rand/types.rs
@@ -0,0 +1,20 @@
+use bitflags::bitflags;
+
+bitflags! {
+    /// `GRND_*` flags for use with [`getrandom`].
+    ///
+    /// [`getrandom`]: crate::rand::getrandom
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct GetRandomFlags: u32 {
+        /// `GRND_RANDOM`
+        const RANDOM = linux_raw_sys::general::GRND_RANDOM;
+        /// `GRND_NONBLOCK`
+        const NONBLOCK = linux_raw_sys::general::GRND_NONBLOCK;
+        /// `GRND_INSECURE`
+        const INSECURE = linux_raw_sys::general::GRND_INSECURE;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/reg.rs b/vendor/rustix/src/backend/linux_raw/reg.rs
new file mode 100644
index 0000000..10f95a5
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/reg.rs
@@ -0,0 +1,258 @@
+//! Encapsulation for system call arguments and return values.
+//!
+//! The inline-asm code paths do some amount of reordering of arguments; to
+//! ensure that we don't accidentally misroute an argument or return value, we
+//! use distinct types for each argument index and return value.
+//!
+//! # Safety
+//!
+//! The `ToAsm` and `FromAsm` traits are unsafe to use; they should only be
+//! used by the syscall code which executes actual syscall machine
+//! instructions.
+
+#![allow(unsafe_code)]
+
+use super::c;
+use super::fd::RawFd;
+use core::marker::PhantomData;
+use core::ops::Range;
+
+pub(super) trait ToAsm: private::Sealed {
+    /// Convert `self` to a `usize` ready to be passed to a syscall
+    /// machine instruction.
+    ///
+    /// # Safety
+    ///
+    /// This should be used immediately before the syscall instruction, and the
+    /// returned value shouldn't be used for any other purpose.
+    #[must_use]
+    unsafe fn to_asm(self) -> *mut Opaque;
+}
+
+pub(super) trait FromAsm: private::Sealed {
+    /// Convert `raw` from a value produced by a syscall machine instruction
+    /// into a `Self`.
+    ///
+    /// # Safety
+    ///
+    /// This should be used immediately after the syscall instruction, and the
+    /// operand value shouldn't be used for any other purpose.
+    #[must_use]
+    unsafe fn from_asm(raw: *mut Opaque) -> Self;
+}
+
+/// To preserve provenance, syscall arguments and return values are passed as
+/// pointer types. They need a type to point to, so we define a custom private
+/// type, to prevent it from being used for anything else.
+#[repr(transparent)]
+pub(super) struct Opaque(c::c_void);
+
+// Argument numbers.
+pub(super) struct A0(());
+pub(super) struct A1(());
+pub(super) struct A2(());
+pub(super) struct A3(());
+pub(super) struct A4(());
+pub(super) struct A5(());
+#[cfg(any(target_arch = "mips", target_arch = "mips32r6"))]
+pub(super) struct A6(());
+#[cfg(target_arch = "x86")]
+pub(super) struct SocketArg;
+
+pub(super) trait ArgNumber: private::Sealed {}
+impl ArgNumber for A0 {}
+impl ArgNumber for A1 {}
+impl ArgNumber for A2 {}
+impl ArgNumber for A3 {}
+impl ArgNumber for A4 {}
+impl ArgNumber for A5 {}
+#[cfg(any(target_arch = "mips", target_arch = "mips32r6"))]
+impl ArgNumber for A6 {}
+#[cfg(target_arch = "x86")]
+impl ArgNumber for SocketArg {}
+
+// Return value numbers.
+pub(super) struct R0(());
+
+pub(super) trait RetNumber: private::Sealed {}
+impl RetNumber for R0 {}
+
+/// Syscall arguments use register-sized types. We use a newtype to
+/// discourage accidental misuse of the raw integer values.
+///
+/// This type doesn't implement `Clone` or `Copy`; it should be used exactly
+/// once. And it has a lifetime to ensure that it doesn't outlive any resources
+/// it might be pointing to.
+#[repr(transparent)]
+#[must_use]
+pub(super) struct ArgReg<'a, Num: ArgNumber> {
+    raw: *mut Opaque,
+    _phantom: PhantomData<(&'a (), Num)>,
+}
+
+impl<'a, Num: ArgNumber> ToAsm for ArgReg<'a, Num> {
+    #[inline]
+    unsafe fn to_asm(self) -> *mut Opaque {
+        self.raw
+    }
+}
+
+/// Syscall return values use register-sized types. We use a newtype to
+/// discourage accidental misuse of the raw integer values.
+///
+/// This type doesn't implement `Clone` or `Copy`; it should be used exactly
+/// once.
+#[repr(transparent)]
+#[must_use]
+pub(super) struct RetReg<Num: RetNumber> {
+    raw: *mut Opaque,
+    _phantom: PhantomData<Num>,
+}
+
+impl<Num: RetNumber> RetReg<Num> {
+    #[inline]
+    pub(super) fn decode_usize(self) -> usize {
+        debug_assert!(!(-4095..0).contains(&(self.raw as isize)));
+        self.raw as usize
+    }
+
+    #[inline]
+    pub(super) fn decode_raw_fd(self) -> RawFd {
+        let bits = self.decode_usize();
+        let raw_fd = bits as RawFd;
+
+        // Converting `raw` to `RawFd` should be lossless.
+        debug_assert_eq!(raw_fd as usize, bits);
+
+        raw_fd
+    }
+
+    #[inline]
+    pub(super) fn decode_c_int(self) -> c::c_int {
+        let bits = self.decode_usize();
+        let c_int_ = bits as c::c_int;
+
+        // Converting `raw` to `c_int` should be lossless.
+        debug_assert_eq!(c_int_ as usize, bits);
+
+        c_int_
+    }
+
+    #[inline]
+    pub(super) fn decode_c_uint(self) -> c::c_uint {
+        let bits = self.decode_usize();
+        let c_uint_ = bits as c::c_uint;
+
+        // Converting `raw` to `c_uint` should be lossless.
+        debug_assert_eq!(c_uint_ as usize, bits);
+
+        c_uint_
+    }
+
+    #[inline]
+    pub(super) fn decode_void_star(self) -> *mut c::c_void {
+        self.raw.cast()
+    }
+
+    #[cfg(target_pointer_width = "64")]
+    #[inline]
+    pub(super) fn decode_u64(self) -> u64 {
+        self.decode_usize() as u64
+    }
+
+    #[inline]
+    pub(super) fn decode_void(self) {
+        let ignore = self.decode_usize();
+        debug_assert_eq!(ignore, 0);
+    }
+
+    #[inline]
+    pub(super) fn decode_error_code(self) -> u16 {
+        let bits = self.raw as usize;
+
+        // `raw` must be in `-4095..0`. Linux always returns errors in
+        // `-4095..0`, and we double-check it here.
+        debug_assert!((-4095..0).contains(&(bits as isize)));
+
+        bits as u16
+    }
+
+    #[inline]
+    pub(super) fn is_nonzero(&self) -> bool {
+        !self.raw.is_null()
+    }
+
+    #[inline]
+    pub(super) fn is_negative(&self) -> bool {
+        (self.raw as isize) < 0
+    }
+
+    #[inline]
+    pub(super) fn is_in_range(&self, range: Range<isize>) -> bool {
+        range.contains(&(self.raw as isize))
+    }
+}
+
+impl<Num: RetNumber> FromAsm for RetReg<Num> {
+    #[inline]
+    unsafe fn from_asm(raw: *mut Opaque) -> Self {
+        Self {
+            raw,
+            _phantom: PhantomData,
+        }
+    }
+}
+
+#[repr(transparent)]
+pub(super) struct SyscallNumber<'a> {
+    nr: usize,
+    _phantom: PhantomData<&'a ()>,
+}
+
+impl<'a> ToAsm for SyscallNumber<'a> {
+    #[inline]
+    unsafe fn to_asm(self) -> *mut Opaque {
+        self.nr as usize as *mut Opaque
+    }
+}
+
+/// Encode a system call argument as an `ArgReg`.
+#[inline]
+pub(super) fn raw_arg<'a, Num: ArgNumber>(raw: *mut Opaque) -> ArgReg<'a, Num> {
+    ArgReg {
+        raw,
+        _phantom: PhantomData,
+    }
+}
+
+/// Encode a system call number (a `__NR_*` constant) as a `SyscallNumber`.
+#[inline]
+pub(super) const fn nr<'a>(nr: u32) -> SyscallNumber<'a> {
+    SyscallNumber {
+        nr: nr as usize,
+        _phantom: PhantomData,
+    }
+}
+
+/// Seal our various traits using the technique documented [here].
+///
+/// [here]: https://rust-lang.github.io/api-guidelines/future-proofing.html
+mod private {
+    pub trait Sealed {}
+
+    // Implement for those same types, but no others.
+    impl<'a, Num: super::ArgNumber> Sealed for super::ArgReg<'a, Num> {}
+    impl<Num: super::RetNumber> Sealed for super::RetReg<Num> {}
+    impl<'a> Sealed for super::SyscallNumber<'a> {}
+    impl Sealed for super::A0 {}
+    impl Sealed for super::A1 {}
+    impl Sealed for super::A2 {}
+    impl Sealed for super::A3 {}
+    impl Sealed for super::A4 {}
+    impl Sealed for super::A5 {}
+    #[cfg(any(target_arch = "mips", target_arch = "mips32r6"))]
+    impl Sealed for super::A6 {}
+    #[cfg(target_arch = "x86")]
+    impl Sealed for super::SocketArg {}
+    impl Sealed for super::R0 {}
+}
diff --git a/vendor/rustix/src/backend/linux_raw/runtime/mod.rs b/vendor/rustix/src/backend/linux_raw/runtime/mod.rs
new file mode 100644
index 0000000..0b48649
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/runtime/mod.rs
@@ -0,0 +1,2 @@
+pub(crate) mod syscalls;
+pub(crate) mod tls;
diff --git a/vendor/rustix/src/backend/linux_raw/runtime/syscalls.rs b/vendor/rustix/src/backend/linux_raw/runtime/syscalls.rs
new file mode 100644
index 0000000..e00acc6
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/runtime/syscalls.rs
@@ -0,0 +1,318 @@
+//! linux_raw syscalls supporting `rustix::runtime`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::c;
+#[cfg(target_arch = "x86")]
+use crate::backend::conv::by_mut;
+#[cfg(target_arch = "x86_64")]
+use crate::backend::conv::c_uint;
+use crate::backend::conv::{
+    by_ref, c_int, ret, ret_c_int, ret_c_int_infallible, ret_error, ret_infallible, ret_void_star,
+    size_of, zero,
+};
+#[cfg(feature = "fs")]
+use crate::fd::BorrowedFd;
+use crate::ffi::CStr;
+#[cfg(feature = "fs")]
+use crate::fs::AtFlags;
+use crate::io;
+use crate::pid::{Pid, RawPid};
+use crate::runtime::{Fork, How, Sigaction, Siginfo, Sigset, Stack};
+use crate::signal::Signal;
+use crate::timespec::Timespec;
+use crate::utils::option_as_ptr;
+use core::ffi::c_void;
+use core::mem::MaybeUninit;
+#[cfg(target_pointer_width = "32")]
+use linux_raw_sys::general::__kernel_old_timespec;
+use linux_raw_sys::general::kernel_sigset_t;
+#[cfg(target_arch = "x86_64")]
+use linux_raw_sys::general::ARCH_SET_FS;
+
+#[inline]
+pub(crate) unsafe fn fork() -> io::Result<Fork> {
+    let mut child_pid = MaybeUninit::<RawPid>::uninit();
+
+    // Unix `fork` only returns the child PID in the parent; we'd like it in
+    // the child too, so set `CLONE_CHILD_SETTID` and pass in the address of
+    // a memory location to store it to in the child.
+    //
+    // Architectures differ on the order of the parameters.
+    #[cfg(target_arch = "x86_64")]
+    let pid = ret_c_int(syscall_readonly!(
+        __NR_clone,
+        c_int(c::SIGCHLD | c::CLONE_CHILD_SETTID),
+        zero(),
+        zero(),
+        &mut child_pid,
+        zero()
+    ))?;
+    #[cfg(any(
+        target_arch = "aarch64",
+        target_arch = "arm",
+        target_arch = "mips",
+        target_arch = "mips32r6",
+        target_arch = "mips64",
+        target_arch = "mips64r6",
+        target_arch = "powerpc64",
+        target_arch = "riscv64",
+        target_arch = "x86"
+    ))]
+    let pid = ret_c_int(syscall_readonly!(
+        __NR_clone,
+        c_int(c::SIGCHLD | c::CLONE_CHILD_SETTID),
+        zero(),
+        zero(),
+        zero(),
+        &mut child_pid
+    ))?;
+
+    Ok(if let Some(pid) = Pid::from_raw(pid) {
+        Fork::Parent(pid)
+    } else {
+        Fork::Child(Pid::from_raw_unchecked(child_pid.assume_init()))
+    })
+}
+
+#[cfg(feature = "fs")]
+pub(crate) unsafe fn execveat(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    args: *const *const u8,
+    env_vars: *const *const u8,
+    flags: AtFlags,
+) -> io::Errno {
+    ret_error(syscall_readonly!(
+        __NR_execveat,
+        dirfd,
+        path,
+        args,
+        env_vars,
+        flags
+    ))
+}
+
+pub(crate) unsafe fn execve(
+    path: &CStr,
+    args: *const *const u8,
+    env_vars: *const *const u8,
+) -> io::Errno {
+    ret_error(syscall_readonly!(__NR_execve, path, args, env_vars))
+}
+
+pub(crate) mod tls {
+    use super::*;
+    #[cfg(target_arch = "x86")]
+    use crate::backend::runtime::tls::UserDesc;
+
+    #[cfg(target_arch = "x86")]
+    #[inline]
+    pub(crate) unsafe fn set_thread_area(u_info: &mut UserDesc) -> io::Result<()> {
+        ret(syscall!(__NR_set_thread_area, by_mut(u_info)))
+    }
+
+    #[cfg(target_arch = "arm")]
+    #[inline]
+    pub(crate) unsafe fn arm_set_tls(data: *mut c::c_void) -> io::Result<()> {
+        ret(syscall_readonly!(__ARM_NR_set_tls, data))
+    }
+
+    #[cfg(target_arch = "x86_64")]
+    #[inline]
+    pub(crate) unsafe fn set_fs(data: *mut c::c_void) {
+        ret_infallible(syscall_readonly!(
+            __NR_arch_prctl,
+            c_uint(ARCH_SET_FS),
+            data,
+            zero(),
+            zero(),
+            zero()
+        ))
+    }
+
+    #[inline]
+    pub(crate) unsafe fn set_tid_address(data: *mut c::c_void) -> Pid {
+        let tid: i32 = ret_c_int_infallible(syscall_readonly!(__NR_set_tid_address, data));
+        Pid::from_raw_unchecked(tid)
+    }
+
+    #[inline]
+    pub(crate) fn exit_thread(code: c::c_int) -> ! {
+        unsafe { syscall_noreturn!(__NR_exit, c_int(code)) }
+    }
+}
+
+#[inline]
+pub(crate) unsafe fn sigaction(signal: Signal, new: Option<Sigaction>) -> io::Result<Sigaction> {
+    let mut old = MaybeUninit::<Sigaction>::uninit();
+    let new = option_as_ptr(new.as_ref());
+    ret(syscall!(
+        __NR_rt_sigaction,
+        signal,
+        new,
+        &mut old,
+        size_of::<kernel_sigset_t, _>()
+    ))?;
+    Ok(old.assume_init())
+}
+
+#[inline]
+pub(crate) unsafe fn sigaltstack(new: Option<Stack>) -> io::Result<Stack> {
+    let mut old = MaybeUninit::<Stack>::uninit();
+    let new = option_as_ptr(new.as_ref());
+    ret(syscall!(__NR_sigaltstack, new, &mut old))?;
+    Ok(old.assume_init())
+}
+
+#[inline]
+pub(crate) unsafe fn tkill(tid: Pid, sig: Signal) -> io::Result<()> {
+    ret(syscall_readonly!(__NR_tkill, tid, sig))
+}
+
+#[inline]
+pub(crate) unsafe fn sigprocmask(how: How, new: Option<&Sigset>) -> io::Result<Sigset> {
+    let mut old = MaybeUninit::<Sigset>::uninit();
+    let new = option_as_ptr(new);
+    ret(syscall!(
+        __NR_rt_sigprocmask,
+        how,
+        new,
+        &mut old,
+        size_of::<kernel_sigset_t, _>()
+    ))?;
+    Ok(old.assume_init())
+}
+
+#[inline]
+pub(crate) fn sigpending() -> Sigset {
+    let mut pending = MaybeUninit::<Sigset>::uninit();
+    unsafe {
+        ret_infallible(syscall!(
+            __NR_rt_sigpending,
+            &mut pending,
+            size_of::<kernel_sigset_t, _>()
+        ));
+        pending.assume_init()
+    }
+}
+
+#[inline]
+pub(crate) fn sigsuspend(set: &Sigset) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_rt_sigsuspend,
+            by_ref(set),
+            size_of::<kernel_sigset_t, _>()
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn sigwait(set: &Sigset) -> io::Result<Signal> {
+    unsafe {
+        match Signal::from_raw(ret_c_int(syscall_readonly!(
+            __NR_rt_sigtimedwait,
+            by_ref(set),
+            zero(),
+            zero(),
+            size_of::<kernel_sigset_t, _>()
+        ))?) {
+            Some(signum) => Ok(signum),
+            None => Err(io::Errno::NOTSUP),
+        }
+    }
+}
+
+#[inline]
+pub(crate) fn sigwaitinfo(set: &Sigset) -> io::Result<Siginfo> {
+    let mut info = MaybeUninit::<Siginfo>::uninit();
+    unsafe {
+        let _signum = ret_c_int(syscall!(
+            __NR_rt_sigtimedwait,
+            by_ref(set),
+            &mut info,
+            zero(),
+            size_of::<kernel_sigset_t, _>()
+        ))?;
+        Ok(info.assume_init())
+    }
+}
+
+#[inline]
+pub(crate) fn sigtimedwait(set: &Sigset, timeout: Option<Timespec>) -> io::Result<Siginfo> {
+    let mut info = MaybeUninit::<Siginfo>::uninit();
+    let timeout_ptr = option_as_ptr(timeout.as_ref());
+
+    // `rt_sigtimedwait_time64` was introduced in Linux 5.1. The old
+    // `rt_sigtimedwait` syscall is not y2038-compatible on 32-bit
+    // architectures.
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        match ret_c_int(syscall!(
+            __NR_rt_sigtimedwait_time64,
+            by_ref(set),
+            &mut info,
+            timeout_ptr,
+            size_of::<kernel_sigset_t, _>()
+        )) {
+            Ok(_signum) => (),
+            Err(io::Errno::NOSYS) => sigtimedwait_old(set, timeout, &mut info)?,
+            Err(err) => return Err(err),
+        }
+        Ok(info.assume_init())
+    }
+
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        let _signum = ret_c_int(syscall!(
+            __NR_rt_sigtimedwait,
+            by_ref(set),
+            &mut info,
+            timeout_ptr,
+            size_of::<kernel_sigset_t, _>()
+        ))?;
+        Ok(info.assume_init())
+    }
+}
+
+#[cfg(target_pointer_width = "32")]
+unsafe fn sigtimedwait_old(
+    set: &Sigset,
+    timeout: Option<Timespec>,
+    info: &mut MaybeUninit<Siginfo>,
+) -> io::Result<()> {
+    let old_timeout = match timeout {
+        Some(timeout) => Some(__kernel_old_timespec {
+            tv_sec: timeout.tv_sec.try_into().map_err(|_| io::Errno::OVERFLOW)?,
+            tv_nsec: timeout.tv_nsec as _,
+        }),
+        None => None,
+    };
+
+    let old_timeout_ptr = option_as_ptr(old_timeout.as_ref());
+
+    let _signum = ret_c_int(syscall!(
+        __NR_rt_sigtimedwait,
+        by_ref(set),
+        info,
+        old_timeout_ptr,
+        size_of::<kernel_sigset_t, _>()
+    ))?;
+
+    Ok(())
+}
+
+#[inline]
+pub(crate) fn exit_group(code: c::c_int) -> ! {
+    unsafe { syscall_noreturn!(__NR_exit_group, c_int(code)) }
+}
+
+#[inline]
+pub(crate) unsafe fn brk(addr: *mut c::c_void) -> io::Result<*mut c_void> {
+    // This is non-`readonly`, to prevent loads from being reordered past it.
+    ret_void_star(syscall!(__NR_brk, addr))
+}
diff --git a/vendor/rustix/src/backend/linux_raw/runtime/tls.rs b/vendor/rustix/src/backend/linux_raw/runtime/tls.rs
new file mode 100644
index 0000000..69bd5ce
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/runtime/tls.rs
@@ -0,0 +1,98 @@
+//! TLS utilities.
+//!
+//! # Safety
+//!
+//! This file contains code that reads the raw phdr array pointed to by the
+//! kernel-provided AUXV values.
+#![allow(unsafe_code)]
+
+use crate::backend::c;
+use crate::backend::param::auxv::exe_phdrs;
+use core::arch::global_asm;
+use core::ptr::{null, NonNull};
+use linux_raw_sys::elf::*;
+
+/// For use with [`set_thread_area`].
+///
+/// [`set_thread_area`]: crate::runtime::set_thread_area
+#[cfg(target_arch = "x86")]
+pub type UserDesc = linux_raw_sys::general::user_desc;
+
+pub(crate) fn startup_tls_info() -> StartupTlsInfo {
+    let mut base = null();
+    let mut tls_phdr = null();
+    let mut stack_size = 0;
+
+    let (first_phdr, phent, phnum) = exe_phdrs();
+    let mut current_phdr = first_phdr.cast::<Elf_Phdr>();
+
+    // The dynamic address of the dynamic section, which we can compare with
+    // the `PT_DYNAMIC` header's static address, if present.
+    let dynamic_addr: *const c::c_void = unsafe { &_DYNAMIC };
+
+    // SAFETY: We assume the phdr array pointer and length the kernel provided
+    // to the process describe a valid phdr array.
+    unsafe {
+        let phdrs_end = current_phdr.cast::<u8>().add(phnum * phent).cast();
+        while current_phdr != phdrs_end {
+            let phdr = &*current_phdr;
+            current_phdr = current_phdr.cast::<u8>().add(phent).cast();
+
+            match phdr.p_type {
+                // Compute the offset from the static virtual addresses
+                // in the `p_vaddr` fields to the dynamic addresses. We don't
+                // always get a `PT_PHDR` or `PT_DYNAMIC` header, so use
+                // whichever one we get.
+                PT_PHDR => base = first_phdr.cast::<u8>().wrapping_sub(phdr.p_vaddr),
+                PT_DYNAMIC => base = dynamic_addr.cast::<u8>().wrapping_sub(phdr.p_vaddr),
+
+                PT_TLS => tls_phdr = phdr,
+                PT_GNU_STACK => stack_size = phdr.p_memsz,
+                _ => {}
+            }
+        }
+
+        if tls_phdr.is_null() {
+            StartupTlsInfo {
+                addr: NonNull::dangling().as_ptr(),
+                mem_size: 0,
+                file_size: 0,
+                align: 1,
+                stack_size: 0,
+            }
+        } else {
+            StartupTlsInfo {
+                addr: base.cast::<u8>().wrapping_add((*tls_phdr).p_vaddr).cast(),
+                mem_size: (*tls_phdr).p_memsz,
+                file_size: (*tls_phdr).p_filesz,
+                align: (*tls_phdr).p_align,
+                stack_size,
+            }
+        }
+    }
+}
+
+extern "C" {
+    /// Declare the `_DYNAMIC` symbol so that we can compare its address with
+    /// the static address in the `PT_DYNAMIC` header to learn our offset. Use
+    /// a weak symbol because `_DYNAMIC` is not always present.
+    static _DYNAMIC: c::c_void;
+}
+// Rust has `extern_weak` but it isn't stable, so use a `global_asm`.
+global_asm!(".weak _DYNAMIC");
+
+/// The values returned from [`startup_tls_info`].
+///
+/// [`startup_tls_info`]: crate::runtime::startup_tls_info
+pub struct StartupTlsInfo {
+    /// The base address of the TLS segment.
+    pub addr: *const c::c_void,
+    /// The size of the memory region.
+    pub mem_size: usize,
+    /// The size beyond which all memory is zero-initialized.
+    pub file_size: usize,
+    /// The required alignment for the TLS segment.
+    pub align: usize,
+    /// The requested minimum size for stacks.
+    pub stack_size: usize,
+}
diff --git a/vendor/rustix/src/backend/linux_raw/shm/mod.rs b/vendor/rustix/src/backend/linux_raw/shm/mod.rs
new file mode 100644
index 0000000..1e0181a
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/shm/mod.rs
@@ -0,0 +1,2 @@
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/linux_raw/shm/syscalls.rs b/vendor/rustix/src/backend/linux_raw/shm/syscalls.rs
new file mode 100644
index 0000000..3b083f4
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/shm/syscalls.rs
@@ -0,0 +1,47 @@
+use crate::ffi::CStr;
+
+use crate::backend::fs::syscalls::{open, unlink};
+use crate::backend::fs::types::{Mode, OFlags};
+use crate::fd::OwnedFd;
+use crate::io;
+use crate::shm::ShmOFlags;
+
+const NAME_MAX: usize = 255;
+const SHM_DIR: &[u8] = b"/dev/shm/";
+
+fn get_shm_name(name: &CStr) -> io::Result<([u8; NAME_MAX + SHM_DIR.len() + 1], usize)> {
+    let name = name.to_bytes();
+
+    if name.len() > NAME_MAX {
+        return Err(io::Errno::NAMETOOLONG);
+    }
+
+    let num_slashes = name.iter().take_while(|x| **x == b'/').count();
+    let after_slashes = &name[num_slashes..];
+    if after_slashes.is_empty()
+        || after_slashes == b"."
+        || after_slashes == b".."
+        || after_slashes.contains(&b'/')
+    {
+        return Err(io::Errno::INVAL);
+    }
+
+    let mut path = [0; NAME_MAX + SHM_DIR.len() + 1];
+    path[..SHM_DIR.len()].copy_from_slice(SHM_DIR);
+    path[SHM_DIR.len()..SHM_DIR.len() + name.len()].copy_from_slice(name);
+    Ok((path, SHM_DIR.len() + name.len() + 1))
+}
+
+pub(crate) fn shm_open(name: &CStr, oflags: ShmOFlags, mode: Mode) -> io::Result<OwnedFd> {
+    let (path, len) = get_shm_name(name)?;
+    open(
+        CStr::from_bytes_with_nul(&path[..len]).unwrap(),
+        OFlags::from_bits(oflags.bits()).unwrap() | OFlags::CLOEXEC,
+        mode,
+    )
+}
+
+pub(crate) fn shm_unlink(name: &CStr) -> io::Result<()> {
+    let (path, len) = get_shm_name(name)?;
+    unlink(CStr::from_bytes_with_nul(&path[..len]).unwrap())
+}
diff --git a/vendor/rustix/src/backend/linux_raw/shm/types.rs b/vendor/rustix/src/backend/linux_raw/shm/types.rs
new file mode 100644
index 0000000..3343d44
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/shm/types.rs
@@ -0,0 +1,30 @@
+use crate::backend::c;
+use bitflags::bitflags;
+
+bitflags! {
+    /// `O_*` constants for use with [`shm_open`].
+    ///
+    /// [`shm_open`]: crate:shm::shm_open
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct ShmOFlags: c::c_uint {
+        /// `O_CREAT`
+        #[doc(alias = "CREAT")]
+        const CREATE = linux_raw_sys::general::O_CREAT;
+
+        /// `O_EXCL`
+        const EXCL = linux_raw_sys::general::O_EXCL;
+
+        /// `O_RDONLY`
+        const RDONLY = linux_raw_sys::general::O_RDONLY;
+
+        /// `O_RDWR`
+        const RDWR = linux_raw_sys::general::O_RDWR;
+
+        /// `O_TRUNC`
+        const TRUNC = linux_raw_sys::general::O_TRUNC;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/system/mod.rs b/vendor/rustix/src/backend/linux_raw/system/mod.rs
new file mode 100644
index 0000000..1e0181a
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/system/mod.rs
@@ -0,0 +1,2 @@
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/linux_raw/system/syscalls.rs b/vendor/rustix/src/backend/linux_raw/system/syscalls.rs
new file mode 100644
index 0000000..6b41cdb
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/system/syscalls.rs
@@ -0,0 +1,49 @@
+//! linux_raw syscalls supporting `rustix::system`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use super::types::RawUname;
+use crate::backend::c;
+use crate::backend::conv::{c_int, ret, ret_infallible, slice};
+use crate::io;
+use crate::system::{RebootCommand, Sysinfo};
+use core::mem::MaybeUninit;
+
+#[inline]
+pub(crate) fn uname() -> RawUname {
+    let mut uname = MaybeUninit::<RawUname>::uninit();
+    unsafe {
+        ret_infallible(syscall!(__NR_uname, &mut uname));
+        uname.assume_init()
+    }
+}
+
+#[inline]
+pub(crate) fn sysinfo() -> Sysinfo {
+    let mut info = MaybeUninit::<Sysinfo>::uninit();
+    unsafe {
+        ret_infallible(syscall!(__NR_sysinfo, &mut info));
+        info.assume_init()
+    }
+}
+
+#[inline]
+pub(crate) fn sethostname(name: &[u8]) -> io::Result<()> {
+    let (ptr, len) = slice(name);
+    unsafe { ret(syscall_readonly!(__NR_sethostname, ptr, len)) }
+}
+
+#[inline]
+pub(crate) fn reboot(cmd: RebootCommand) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_reboot,
+            c_int(c::LINUX_REBOOT_MAGIC1),
+            c_int(c::LINUX_REBOOT_MAGIC2),
+            c_int(cmd as i32)
+        ))
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/system/types.rs b/vendor/rustix/src/backend/linux_raw/system/types.rs
new file mode 100644
index 0000000..4729273
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/system/types.rs
@@ -0,0 +1,4 @@
+/// `sysinfo`
+pub type Sysinfo = linux_raw_sys::system::sysinfo;
+
+pub(crate) type RawUname = linux_raw_sys::system::new_utsname;
diff --git a/vendor/rustix/src/backend/linux_raw/termios/mod.rs b/vendor/rustix/src/backend/linux_raw/termios/mod.rs
new file mode 100644
index 0000000..ef944f0
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/termios/mod.rs
@@ -0,0 +1 @@
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/linux_raw/termios/syscalls.rs b/vendor/rustix/src/backend/linux_raw/termios/syscalls.rs
new file mode 100644
index 0000000..5a24c0a
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/termios/syscalls.rs
@@ -0,0 +1,330 @@
+//! linux_raw syscalls supporting `rustix::termios`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::c;
+use crate::backend::conv::{by_ref, c_uint, ret};
+use crate::fd::BorrowedFd;
+use crate::io;
+use crate::pid::Pid;
+#[cfg(all(feature = "alloc", feature = "procfs"))]
+use crate::procfs;
+use crate::termios::{
+    Action, ControlModes, InputModes, LocalModes, OptionalActions, OutputModes, QueueSelector,
+    SpecialCodeIndex, Termios, Winsize,
+};
+#[cfg(all(feature = "alloc", feature = "procfs"))]
+use crate::{ffi::CStr, fs::FileType, path::DecInt};
+use core::mem::MaybeUninit;
+use linux_raw_sys::general::IBSHIFT;
+use linux_raw_sys::ioctl::{
+    TCFLSH, TCSBRK, TCXONC, TIOCGPGRP, TIOCGSID, TIOCGWINSZ, TIOCSPGRP, TIOCSWINSZ,
+};
+
+#[inline]
+pub(crate) fn tcgetwinsize(fd: BorrowedFd<'_>) -> io::Result<Winsize> {
+    unsafe {
+        let mut result = MaybeUninit::<Winsize>::uninit();
+        ret(syscall!(__NR_ioctl, fd, c_uint(TIOCGWINSZ), &mut result))?;
+        Ok(result.assume_init())
+    }
+}
+
+#[inline]
+pub(crate) fn tcgetattr(fd: BorrowedFd<'_>) -> io::Result<Termios> {
+    unsafe {
+        let mut result = MaybeUninit::<Termios>::uninit();
+
+        // QEMU's `TCGETS2` doesn't currently set `input_speed` or
+        // `output_speed` on PowerPC, so zero out the fields ourselves.
+        #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
+        {
+            result.write(core::mem::zeroed());
+        }
+
+        ret(syscall!(__NR_ioctl, fd, c_uint(c::TCGETS2), &mut result))?;
+
+        let result = result.assume_init();
+
+        // QEMU's `TCGETS2` doesn't currently set `input_speed` or
+        // `output_speed` on PowerPC, so set them manually if we can.
+        #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
+        let result = {
+            use crate::termios::speed;
+            let mut result = result;
+            if result.output_speed == 0 && (result.control_modes.bits() & c::CBAUD) != c::BOTHER {
+                if let Some(output_speed) = speed::decode(result.control_modes.bits() & c::CBAUD) {
+                    result.output_speed = output_speed;
+                }
+            }
+            if result.input_speed == 0
+                && ((result.control_modes.bits() & c::CIBAUD) >> c::IBSHIFT) != c::BOTHER
+            {
+                // For input speeds, `B0` is special-cased to mean the input
+                // speed is the same as the output speed.
+                if ((result.control_modes.bits() & c::CIBAUD) >> c::IBSHIFT) == c::B0 {
+                    result.input_speed = result.output_speed;
+                } else if let Some(input_speed) =
+                    speed::decode((result.control_modes.bits() & c::CIBAUD) >> c::IBSHIFT)
+                {
+                    result.input_speed = input_speed;
+                }
+            }
+            result
+        };
+
+        Ok(result)
+    }
+}
+
+#[inline]
+pub(crate) fn tcgetpgrp(fd: BorrowedFd<'_>) -> io::Result<Pid> {
+    unsafe {
+        let mut result = MaybeUninit::<c::pid_t>::uninit();
+        ret(syscall!(__NR_ioctl, fd, c_uint(TIOCGPGRP), &mut result))?;
+        let pid = result.assume_init();
+
+        // This doesn't appear to be documented, but it appears `tcsetpgrp` can
+        // succceed and set the pid to 0 if we pass it a pseudo-terminal device
+        // fd. For now, fail with `OPNOTSUPP`.
+        if pid == 0 {
+            return Err(io::Errno::OPNOTSUPP);
+        }
+
+        Ok(Pid::from_raw_unchecked(pid))
+    }
+}
+
+#[inline]
+pub(crate) fn tcsetattr(
+    fd: BorrowedFd<'_>,
+    optional_actions: OptionalActions,
+    termios: &Termios,
+) -> io::Result<()> {
+    // Translate from `optional_actions` into an ioctl request code. On MIPS,
+    // `optional_actions` already has `TCGETS` added to it.
+    let request = linux_raw_sys::ioctl::TCSETS2
+        + if cfg!(any(
+            target_arch = "mips",
+            target_arch = "mips32r6",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )) {
+            optional_actions as u32 - linux_raw_sys::ioctl::TCSETS
+        } else {
+            optional_actions as u32
+        };
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_ioctl,
+            fd,
+            c_uint(request),
+            by_ref(termios)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn tcsendbreak(fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_ioctl, fd, c_uint(TCSBRK), c_uint(0))) }
+}
+
+#[inline]
+pub(crate) fn tcdrain(fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_ioctl, fd, c_uint(TCSBRK), c_uint(1))) }
+}
+
+#[inline]
+pub(crate) fn tcflush(fd: BorrowedFd<'_>, queue_selector: QueueSelector) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_ioctl,
+            fd,
+            c_uint(TCFLSH),
+            c_uint(queue_selector as u32)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn tcflow(fd: BorrowedFd<'_>, action: Action) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_ioctl,
+            fd,
+            c_uint(TCXONC),
+            c_uint(action as u32)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn tcgetsid(fd: BorrowedFd<'_>) -> io::Result<Pid> {
+    unsafe {
+        let mut result = MaybeUninit::<c::pid_t>::uninit();
+        ret(syscall!(__NR_ioctl, fd, c_uint(TIOCGSID), &mut result))?;
+        let pid = result.assume_init();
+        Ok(Pid::from_raw_unchecked(pid))
+    }
+}
+
+#[inline]
+pub(crate) fn tcsetwinsize(fd: BorrowedFd<'_>, winsize: Winsize) -> io::Result<()> {
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_ioctl,
+            fd,
+            c_uint(TIOCSWINSZ),
+            by_ref(&winsize)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn tcsetpgrp(fd: BorrowedFd<'_>, pid: Pid) -> io::Result<()> {
+    let raw_pid: c::c_int = pid.as_raw_nonzero().get();
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_ioctl,
+            fd,
+            c_uint(TIOCSPGRP),
+            by_ref(&raw_pid)
+        ))
+    }
+}
+
+/// A wrapper around a conceptual `cfsetspeed` which handles an arbitrary
+/// integer speed value.
+#[inline]
+pub(crate) fn set_speed(termios: &mut Termios, arbitrary_speed: u32) -> io::Result<()> {
+    let encoded_speed = crate::termios::speed::encode(arbitrary_speed).unwrap_or(c::BOTHER);
+
+    debug_assert_eq!(encoded_speed & !c::CBAUD, 0);
+
+    termios.control_modes -= ControlModes::from_bits_retain(c::CBAUD | c::CIBAUD);
+    termios.control_modes |=
+        ControlModes::from_bits_retain(encoded_speed | (encoded_speed << IBSHIFT));
+
+    termios.input_speed = arbitrary_speed;
+    termios.output_speed = arbitrary_speed;
+
+    Ok(())
+}
+
+/// A wrapper around a conceptual `cfsetospeed` which handles an arbitrary
+/// integer speed value.
+#[inline]
+pub(crate) fn set_output_speed(termios: &mut Termios, arbitrary_speed: u32) -> io::Result<()> {
+    let encoded_speed = crate::termios::speed::encode(arbitrary_speed).unwrap_or(c::BOTHER);
+
+    debug_assert_eq!(encoded_speed & !c::CBAUD, 0);
+
+    termios.control_modes -= ControlModes::from_bits_retain(c::CBAUD);
+    termios.control_modes |= ControlModes::from_bits_retain(encoded_speed);
+
+    termios.output_speed = arbitrary_speed;
+
+    Ok(())
+}
+
+/// A wrapper around a conceptual `cfsetispeed` which handles an arbitrary
+/// integer speed value.
+#[inline]
+pub(crate) fn set_input_speed(termios: &mut Termios, arbitrary_speed: u32) -> io::Result<()> {
+    let encoded_speed = crate::termios::speed::encode(arbitrary_speed).unwrap_or(c::BOTHER);
+
+    debug_assert_eq!(encoded_speed & !c::CBAUD, 0);
+
+    termios.control_modes -= ControlModes::from_bits_retain(c::CIBAUD);
+    termios.control_modes |= ControlModes::from_bits_retain(encoded_speed << IBSHIFT);
+
+    termios.input_speed = arbitrary_speed;
+
+    Ok(())
+}
+
+#[inline]
+pub(crate) fn cfmakeraw(termios: &mut Termios) {
+    // From the Linux [`cfmakeraw` manual page]:
+    //
+    // [`cfmakeraw` manual page]: https://man7.org/linux/man-pages/man3/cfmakeraw.3.html
+    termios.input_modes -= InputModes::IGNBRK
+        | InputModes::BRKINT
+        | InputModes::PARMRK
+        | InputModes::ISTRIP
+        | InputModes::INLCR
+        | InputModes::IGNCR
+        | InputModes::ICRNL
+        | InputModes::IXON;
+    termios.output_modes -= OutputModes::OPOST;
+    termios.local_modes -= LocalModes::ECHO
+        | LocalModes::ECHONL
+        | LocalModes::ICANON
+        | LocalModes::ISIG
+        | LocalModes::IEXTEN;
+    termios.control_modes -= ControlModes::CSIZE | ControlModes::PARENB;
+    termios.control_modes |= ControlModes::CS8;
+
+    // Musl and glibc also do these:
+    termios.special_codes[SpecialCodeIndex::VMIN] = 1;
+    termios.special_codes[SpecialCodeIndex::VTIME] = 0;
+}
+
+#[inline]
+pub(crate) fn isatty(fd: BorrowedFd<'_>) -> bool {
+    // On error, Linux will return either `EINVAL` (2.6.32) or `ENOTTY`
+    // (otherwise), because we assume we're never passing an invalid
+    // file descriptor (which would get `EBADF`). Either way, an error
+    // means we don't have a tty.
+    tcgetwinsize(fd).is_ok()
+}
+
+#[cfg(all(feature = "alloc", feature = "procfs"))]
+pub(crate) fn ttyname(fd: BorrowedFd<'_>, buf: &mut [MaybeUninit<u8>]) -> io::Result<usize> {
+    let fd_stat = crate::backend::fs::syscalls::fstat(fd)?;
+
+    // Quick check: if `fd` isn't a character device, it's not a tty.
+    if FileType::from_raw_mode(fd_stat.st_mode) != FileType::CharacterDevice {
+        return Err(io::Errno::NOTTY);
+    }
+
+    // Check that `fd` is really a tty.
+    tcgetwinsize(fd)?;
+
+    // Get a fd to "/proc/self/fd".
+    let proc_self_fd = procfs::proc_self_fd()?;
+
+    // Gather the ttyname by reading the "fd" file inside `proc_self_fd`.
+    let r = crate::backend::fs::syscalls::readlinkat(
+        proc_self_fd,
+        DecInt::from_fd(fd).as_c_str(),
+        buf,
+    )?;
+
+    // If the number of bytes is equal to the buffer length, truncation may
+    // have occurred. This check also ensures that we have enough space for
+    // adding a NUL terminator.
+    if r == buf.len() {
+        return Err(io::Errno::RANGE);
+    }
+
+    // `readlinkat` returns the number of bytes placed in the buffer.
+    // NUL-terminate the string at that offset.
+    buf[r].write(b'\0');
+
+    // Check that the path we read refers to the same file as `fd`.
+    {
+        // SAFETY: We just wrote the NUL byte above
+        let path = unsafe { CStr::from_ptr(buf.as_ptr().cast()) };
+
+        let path_stat = crate::backend::fs::syscalls::stat(path)?;
+        if path_stat.st_dev != fd_stat.st_dev || path_stat.st_ino != fd_stat.st_ino {
+            return Err(io::Errno::NODEV);
+        }
+    }
+
+    Ok(r)
+}
diff --git a/vendor/rustix/src/backend/linux_raw/thread/futex.rs b/vendor/rustix/src/backend/linux_raw/thread/futex.rs
new file mode 100644
index 0000000..263e980
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/thread/futex.rs
@@ -0,0 +1,45 @@
+bitflags::bitflags! {
+    /// `FUTEX_*` flags for use with [`futex`].
+    ///
+    /// [`futex`]: crate::thread::futex
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct FutexFlags: u32 {
+        /// `FUTEX_PRIVATE_FLAG`
+        const PRIVATE = linux_raw_sys::general::FUTEX_PRIVATE_FLAG;
+        /// `FUTEX_CLOCK_REALTIME`
+        const CLOCK_REALTIME = linux_raw_sys::general::FUTEX_CLOCK_REALTIME;
+
+        // This deliberately lacks a `const _ = !0`, so that users can use
+        // `from_bits_truncate` to extract the `SocketFlags` from a flags
+        // value that also includes a `SocketType`.
+    }
+}
+
+/// `FUTEX_*` operations for use with [`futex`].
+///
+/// [`futex`]: crate::thread::futex
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[repr(u32)]
+pub enum FutexOperation {
+    /// `FUTEX_WAIT`
+    Wait = linux_raw_sys::general::FUTEX_WAIT,
+    /// `FUTEX_WAKE`
+    Wake = linux_raw_sys::general::FUTEX_WAKE,
+    /// `FUTEX_FD`
+    Fd = linux_raw_sys::general::FUTEX_FD,
+    /// `FUTEX_REQUEUE`
+    Requeue = linux_raw_sys::general::FUTEX_REQUEUE,
+    /// `FUTEX_CMP_REQUEUE`
+    CmpRequeue = linux_raw_sys::general::FUTEX_CMP_REQUEUE,
+    /// `FUTEX_WAKE_OP`
+    WakeOp = linux_raw_sys::general::FUTEX_WAKE_OP,
+    /// `FUTEX_LOCK_PI`
+    LockPi = linux_raw_sys::general::FUTEX_LOCK_PI,
+    /// `FUTEX_UNLOCK_PI`
+    UnlockPi = linux_raw_sys::general::FUTEX_UNLOCK_PI,
+    /// `FUTEX_TRYLOCK_PI`
+    TrylockPi = linux_raw_sys::general::FUTEX_TRYLOCK_PI,
+    /// `FUTEX_WAIT_BITSET`
+    WaitBitset = linux_raw_sys::general::FUTEX_WAIT_BITSET,
+}
diff --git a/vendor/rustix/src/backend/linux_raw/thread/mod.rs b/vendor/rustix/src/backend/linux_raw/thread/mod.rs
new file mode 100644
index 0000000..6a002c6
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/thread/mod.rs
@@ -0,0 +1,2 @@
+pub(crate) mod futex;
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/linux_raw/thread/syscalls.rs b/vendor/rustix/src/backend/linux_raw/thread/syscalls.rs
new file mode 100644
index 0000000..0095eed
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/thread/syscalls.rs
@@ -0,0 +1,347 @@
+//! linux_raw syscalls supporting `rustix::thread`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::c;
+use crate::backend::conv::{
+    by_mut, by_ref, c_int, c_uint, ret, ret_c_int, ret_c_int_infallible, ret_usize,
+    slice_just_addr, slice_just_addr_mut, zero,
+};
+use crate::fd::BorrowedFd;
+use crate::io;
+use crate::pid::Pid;
+use crate::thread::{ClockId, FutexFlags, FutexOperation, NanosleepRelativeResult, Timespec};
+use core::mem::MaybeUninit;
+#[cfg(target_pointer_width = "32")]
+use linux_raw_sys::general::timespec as __kernel_old_timespec;
+use linux_raw_sys::general::{__kernel_timespec, TIMER_ABSTIME};
+
+#[inline]
+pub(crate) fn clock_nanosleep_relative(
+    id: ClockId,
+    req: &__kernel_timespec,
+) -> NanosleepRelativeResult {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        let mut rem = MaybeUninit::<__kernel_timespec>::uninit();
+        match ret(syscall!(
+            __NR_clock_nanosleep_time64,
+            id,
+            c_int(0),
+            by_ref(req),
+            &mut rem
+        ))
+        .or_else(|err| {
+            // See the comments in `rustix_clock_gettime_via_syscall` about
+            // emulation.
+            if err == io::Errno::NOSYS {
+                clock_nanosleep_relative_old(id, req, &mut rem)
+            } else {
+                Err(err)
+            }
+        }) {
+            Ok(()) => NanosleepRelativeResult::Ok,
+            Err(io::Errno::INTR) => NanosleepRelativeResult::Interrupted(rem.assume_init()),
+            Err(err) => NanosleepRelativeResult::Err(err),
+        }
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        let mut rem = MaybeUninit::<__kernel_timespec>::uninit();
+        match ret(syscall!(
+            __NR_clock_nanosleep,
+            id,
+            c_int(0),
+            by_ref(req),
+            &mut rem
+        )) {
+            Ok(()) => NanosleepRelativeResult::Ok,
+            Err(io::Errno::INTR) => NanosleepRelativeResult::Interrupted(rem.assume_init()),
+            Err(err) => NanosleepRelativeResult::Err(err),
+        }
+    }
+}
+
+#[cfg(target_pointer_width = "32")]
+unsafe fn clock_nanosleep_relative_old(
+    id: ClockId,
+    req: &__kernel_timespec,
+    rem: &mut MaybeUninit<__kernel_timespec>,
+) -> io::Result<()> {
+    let old_req = __kernel_old_timespec {
+        tv_sec: req.tv_sec.try_into().map_err(|_| io::Errno::INVAL)?,
+        tv_nsec: req.tv_nsec.try_into().map_err(|_| io::Errno::INVAL)?,
+    };
+    let mut old_rem = MaybeUninit::<__kernel_old_timespec>::uninit();
+    ret(syscall!(
+        __NR_clock_nanosleep,
+        id,
+        c_int(0),
+        by_ref(&old_req),
+        &mut old_rem
+    ))?;
+    let old_rem = old_rem.assume_init();
+    rem.write(__kernel_timespec {
+        tv_sec: old_rem.tv_sec.into(),
+        tv_nsec: old_rem.tv_nsec.into(),
+    });
+    Ok(())
+}
+
+#[inline]
+pub(crate) fn clock_nanosleep_absolute(id: ClockId, req: &__kernel_timespec) -> io::Result<()> {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_clock_nanosleep_time64,
+            id,
+            c_uint(TIMER_ABSTIME),
+            by_ref(req),
+            zero()
+        ))
+        .or_else(|err| {
+            // See the comments in `rustix_clock_gettime_via_syscall` about
+            // emulation.
+            if err == io::Errno::NOSYS {
+                clock_nanosleep_absolute_old(id, req)
+            } else {
+                Err(err)
+            }
+        })
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_clock_nanosleep,
+            id,
+            c_uint(TIMER_ABSTIME),
+            by_ref(req),
+            zero()
+        ))
+    }
+}
+
+#[cfg(target_pointer_width = "32")]
+unsafe fn clock_nanosleep_absolute_old(id: ClockId, req: &__kernel_timespec) -> io::Result<()> {
+    let old_req = __kernel_old_timespec {
+        tv_sec: req.tv_sec.try_into().map_err(|_| io::Errno::INVAL)?,
+        tv_nsec: req.tv_nsec.try_into().map_err(|_| io::Errno::INVAL)?,
+    };
+    ret(syscall_readonly!(
+        __NR_clock_nanosleep,
+        id,
+        c_int(0),
+        by_ref(&old_req),
+        zero()
+    ))
+}
+
+#[inline]
+pub(crate) fn nanosleep(req: &__kernel_timespec) -> NanosleepRelativeResult {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        let mut rem = MaybeUninit::<__kernel_timespec>::uninit();
+        match ret(syscall!(
+            __NR_clock_nanosleep_time64,
+            ClockId::Realtime,
+            c_int(0),
+            by_ref(req),
+            &mut rem
+        ))
+        .or_else(|err| {
+            // See the comments in `rustix_clock_gettime_via_syscall` about
+            // emulation.
+            if err == io::Errno::NOSYS {
+                nanosleep_old(req, &mut rem)
+            } else {
+                Err(err)
+            }
+        }) {
+            Ok(()) => NanosleepRelativeResult::Ok,
+            Err(io::Errno::INTR) => NanosleepRelativeResult::Interrupted(rem.assume_init()),
+            Err(err) => NanosleepRelativeResult::Err(err),
+        }
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        let mut rem = MaybeUninit::<__kernel_timespec>::uninit();
+        match ret(syscall!(__NR_nanosleep, by_ref(req), &mut rem)) {
+            Ok(()) => NanosleepRelativeResult::Ok,
+            Err(io::Errno::INTR) => NanosleepRelativeResult::Interrupted(rem.assume_init()),
+            Err(err) => NanosleepRelativeResult::Err(err),
+        }
+    }
+}
+
+#[cfg(target_pointer_width = "32")]
+unsafe fn nanosleep_old(
+    req: &__kernel_timespec,
+    rem: &mut MaybeUninit<__kernel_timespec>,
+) -> io::Result<()> {
+    let old_req = __kernel_old_timespec {
+        tv_sec: req.tv_sec.try_into().map_err(|_| io::Errno::INVAL)?,
+        tv_nsec: req.tv_nsec.try_into().map_err(|_| io::Errno::INVAL)?,
+    };
+    let mut old_rem = MaybeUninit::<__kernel_old_timespec>::uninit();
+    ret(syscall!(__NR_nanosleep, by_ref(&old_req), &mut old_rem))?;
+    let old_rem = old_rem.assume_init();
+    rem.write(__kernel_timespec {
+        tv_sec: old_rem.tv_sec.into(),
+        tv_nsec: old_rem.tv_nsec.into(),
+    });
+    Ok(())
+}
+
+#[inline]
+pub(crate) fn gettid() -> Pid {
+    unsafe {
+        let tid = ret_c_int_infallible(syscall_readonly!(__NR_gettid));
+        Pid::from_raw_unchecked(tid)
+    }
+}
+
+// TODO: This could be de-multiplexed.
+#[inline]
+pub(crate) unsafe fn futex(
+    uaddr: *mut u32,
+    op: FutexOperation,
+    flags: FutexFlags,
+    val: u32,
+    utime: *const Timespec,
+    uaddr2: *mut u32,
+    val3: u32,
+) -> io::Result<usize> {
+    #[cfg(target_pointer_width = "32")]
+    {
+        ret_usize(syscall!(
+            __NR_futex_time64,
+            uaddr,
+            (op, flags),
+            c_uint(val),
+            utime,
+            uaddr2,
+            c_uint(val3)
+        ))
+        .or_else(|err| {
+            // See the comments in `rustix_clock_gettime_via_syscall` about
+            // emulation.
+            if err == io::Errno::NOSYS {
+                futex_old(uaddr, op, flags, val, utime, uaddr2, val3)
+            } else {
+                Err(err)
+            }
+        })
+    }
+    #[cfg(target_pointer_width = "64")]
+    ret_usize(syscall!(
+        __NR_futex,
+        uaddr,
+        (op, flags),
+        c_uint(val),
+        utime,
+        uaddr2,
+        c_uint(val3)
+    ))
+}
+
+#[cfg(target_pointer_width = "32")]
+unsafe fn futex_old(
+    uaddr: *mut u32,
+    op: FutexOperation,
+    flags: FutexFlags,
+    val: u32,
+    utime: *const Timespec,
+    uaddr2: *mut u32,
+    val3: u32,
+) -> io::Result<usize> {
+    let old_utime = __kernel_old_timespec {
+        tv_sec: (*utime).tv_sec.try_into().map_err(|_| io::Errno::INVAL)?,
+        tv_nsec: (*utime).tv_nsec.try_into().map_err(|_| io::Errno::INVAL)?,
+    };
+    ret_usize(syscall!(
+        __NR_futex,
+        uaddr,
+        (op, flags),
+        c_uint(val),
+        by_ref(&old_utime),
+        uaddr2,
+        c_uint(val3)
+    ))
+}
+
+#[inline]
+pub(crate) fn setns(fd: BorrowedFd<'_>, nstype: c::c_int) -> io::Result<c::c_int> {
+    unsafe { ret_c_int(syscall_readonly!(__NR_setns, fd, c_int(nstype))) }
+}
+
+#[inline]
+pub(crate) fn unshare(flags: crate::thread::UnshareFlags) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_unshare, flags)) }
+}
+
+#[inline]
+pub(crate) fn capget(
+    header: &mut linux_raw_sys::general::__user_cap_header_struct,
+    data: &mut [MaybeUninit<linux_raw_sys::general::__user_cap_data_struct>],
+) -> io::Result<()> {
+    unsafe {
+        ret(syscall!(
+            __NR_capget,
+            by_mut(header),
+            slice_just_addr_mut(data)
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn capset(
+    header: &mut linux_raw_sys::general::__user_cap_header_struct,
+    data: &[linux_raw_sys::general::__user_cap_data_struct],
+) -> io::Result<()> {
+    unsafe { ret(syscall!(__NR_capset, by_mut(header), slice_just_addr(data))) }
+}
+
+#[inline]
+pub(crate) fn setuid_thread(uid: crate::ugid::Uid) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_setuid, uid)) }
+}
+
+#[inline]
+pub(crate) fn setresuid_thread(
+    ruid: crate::ugid::Uid,
+    euid: crate::ugid::Uid,
+    suid: crate::ugid::Uid,
+) -> io::Result<()> {
+    #[cfg(any(target_arch = "x86", target_arch = "arm", target_arch = "sparc"))]
+    unsafe {
+        ret(syscall_readonly!(__NR_setresuid32, ruid, euid, suid))
+    }
+    #[cfg(not(any(target_arch = "x86", target_arch = "arm", target_arch = "sparc")))]
+    unsafe {
+        ret(syscall_readonly!(__NR_setresuid, ruid, euid, suid))
+    }
+}
+
+#[inline]
+pub(crate) fn setgid_thread(gid: crate::ugid::Gid) -> io::Result<()> {
+    unsafe { ret(syscall_readonly!(__NR_setgid, gid)) }
+}
+
+#[inline]
+pub(crate) fn setresgid_thread(
+    rgid: crate::ugid::Gid,
+    egid: crate::ugid::Gid,
+    sgid: crate::ugid::Gid,
+) -> io::Result<()> {
+    #[cfg(any(target_arch = "x86", target_arch = "arm", target_arch = "sparc"))]
+    unsafe {
+        ret(syscall_readonly!(__NR_setresgid32, rgid, egid, sgid))
+    }
+    #[cfg(not(any(target_arch = "x86", target_arch = "arm", target_arch = "sparc")))]
+    unsafe {
+        ret(syscall_readonly!(__NR_setresgid, rgid, egid, sgid))
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/time/mod.rs b/vendor/rustix/src/backend/linux_raw/time/mod.rs
new file mode 100644
index 0000000..c42592c
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/time/mod.rs
@@ -0,0 +1,3 @@
+#[cfg(any(feature = "time", target_arch = "x86"))]
+pub(crate) mod syscalls;
+pub(crate) mod types;
diff --git a/vendor/rustix/src/backend/linux_raw/time/syscalls.rs b/vendor/rustix/src/backend/linux_raw/time/syscalls.rs
new file mode 100644
index 0000000..d20bcfa
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/time/syscalls.rs
@@ -0,0 +1,257 @@
+//! linux_raw syscalls supporting `rustix::time`.
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::conv::{ret, ret_infallible};
+use crate::clockid::ClockId;
+use crate::io;
+use crate::timespec::Timespec;
+use core::mem::MaybeUninit;
+#[cfg(all(feature = "time", target_pointer_width = "32"))]
+use linux_raw_sys::general::itimerspec as __kernel_old_itimerspec;
+#[cfg(target_pointer_width = "32")]
+use linux_raw_sys::general::timespec as __kernel_old_timespec;
+#[cfg(feature = "time")]
+use {
+    crate::backend::conv::{by_ref, ret_owned_fd},
+    crate::fd::BorrowedFd,
+    crate::fd::OwnedFd,
+    crate::time::{Itimerspec, TimerfdClockId, TimerfdFlags, TimerfdTimerFlags},
+};
+
+// `clock_gettime` has special optimizations via the vDSO.
+#[cfg(feature = "time")]
+pub(crate) use crate::backend::vdso_wrappers::{clock_gettime, clock_gettime_dynamic};
+
+#[inline]
+pub(crate) fn clock_getres(which_clock: ClockId) -> Timespec {
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        let mut result = MaybeUninit::<Timespec>::uninit();
+        if let Err(err) = ret(syscall!(__NR_clock_getres_time64, which_clock, &mut result)) {
+            // See the comments in `rustix_clock_gettime_via_syscall` about
+            // emulation.
+            debug_assert_eq!(err, io::Errno::NOSYS);
+            clock_getres_old(which_clock, &mut result);
+        }
+        result.assume_init()
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        let mut result = MaybeUninit::<Timespec>::uninit();
+        ret_infallible(syscall!(__NR_clock_getres, which_clock, &mut result));
+        result.assume_init()
+    }
+}
+
+#[cfg(target_pointer_width = "32")]
+unsafe fn clock_getres_old(which_clock: ClockId, result: &mut MaybeUninit<Timespec>) {
+    let mut old_result = MaybeUninit::<__kernel_old_timespec>::uninit();
+    ret_infallible(syscall!(__NR_clock_getres, which_clock, &mut old_result));
+    let old_result = old_result.assume_init();
+    result.write(Timespec {
+        tv_sec: old_result.tv_sec.into(),
+        tv_nsec: old_result.tv_nsec.into(),
+    });
+}
+
+#[cfg(feature = "time")]
+#[inline]
+pub(crate) fn clock_settime(which_clock: ClockId, timespec: Timespec) -> io::Result<()> {
+    // `clock_settime64` was introduced in Linux 5.1. The old `clock_settime`
+    // syscall is not y2038-compatible on 32-bit architectures.
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        match ret(syscall_readonly!(
+            __NR_clock_settime64,
+            which_clock,
+            by_ref(&timespec)
+        )) {
+            Err(io::Errno::NOSYS) => clock_settime_old(which_clock, timespec),
+            otherwise => otherwise,
+        }
+    }
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret(syscall_readonly!(
+            __NR_clock_settime,
+            which_clock,
+            by_ref(&timespec)
+        ))
+    }
+}
+
+#[cfg(feature = "time")]
+#[cfg(target_pointer_width = "32")]
+unsafe fn clock_settime_old(which_clock: ClockId, timespec: Timespec) -> io::Result<()> {
+    let old_timespec = __kernel_old_timespec {
+        tv_sec: timespec
+            .tv_sec
+            .try_into()
+            .map_err(|_| io::Errno::OVERFLOW)?,
+        tv_nsec: timespec.tv_nsec as _,
+    };
+    ret(syscall_readonly!(
+        __NR_clock_settime,
+        which_clock,
+        by_ref(&old_timespec)
+    ))
+}
+
+#[cfg(feature = "time")]
+#[inline]
+pub(crate) fn timerfd_create(clockid: TimerfdClockId, flags: TimerfdFlags) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(syscall_readonly!(__NR_timerfd_create, clockid, flags)) }
+}
+
+#[cfg(feature = "time")]
+#[inline]
+pub(crate) fn timerfd_settime(
+    fd: BorrowedFd<'_>,
+    flags: TimerfdTimerFlags,
+    new_value: &Itimerspec,
+) -> io::Result<Itimerspec> {
+    let mut result = MaybeUninit::<Itimerspec>::uninit();
+
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret(syscall!(
+            __NR_timerfd_settime,
+            fd,
+            flags,
+            by_ref(new_value),
+            &mut result
+        ))?;
+        Ok(result.assume_init())
+    }
+
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret(syscall!(
+            __NR_timerfd_settime64,
+            fd,
+            flags,
+            by_ref(new_value),
+            &mut result
+        ))
+        .or_else(|err| {
+            // See the comments in `rustix_clock_gettime_via_syscall` about
+            // emulation.
+            if err == io::Errno::NOSYS {
+                timerfd_settime_old(fd, flags, new_value, &mut result)
+            } else {
+                Err(err)
+            }
+        })?;
+        Ok(result.assume_init())
+    }
+}
+
+#[cfg(feature = "time")]
+#[cfg(target_pointer_width = "32")]
+unsafe fn timerfd_settime_old(
+    fd: BorrowedFd<'_>,
+    flags: TimerfdTimerFlags,
+    new_value: &Itimerspec,
+    result: &mut MaybeUninit<Itimerspec>,
+) -> io::Result<()> {
+    let mut old_result = MaybeUninit::<__kernel_old_itimerspec>::uninit();
+
+    // Convert `new_value` to the old `__kernel_old_itimerspec` format.
+    let old_new_value = __kernel_old_itimerspec {
+        it_interval: __kernel_old_timespec {
+            tv_sec: new_value
+                .it_interval
+                .tv_sec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+            tv_nsec: new_value
+                .it_interval
+                .tv_nsec
+                .try_into()
+                .map_err(|_| io::Errno::INVAL)?,
+        },
+        it_value: __kernel_old_timespec {
+            tv_sec: new_value
+                .it_value
+                .tv_sec
+                .try_into()
+                .map_err(|_| io::Errno::OVERFLOW)?,
+            tv_nsec: new_value
+                .it_value
+                .tv_nsec
+                .try_into()
+                .map_err(|_| io::Errno::INVAL)?,
+        },
+    };
+    ret(syscall!(
+        __NR_timerfd_settime,
+        fd,
+        flags,
+        by_ref(&old_new_value),
+        &mut old_result
+    ))?;
+    let old_result = old_result.assume_init();
+    result.write(Itimerspec {
+        it_interval: Timespec {
+            tv_sec: old_result.it_interval.tv_sec.into(),
+            tv_nsec: old_result.it_interval.tv_nsec.into(),
+        },
+        it_value: Timespec {
+            tv_sec: old_result.it_value.tv_sec.into(),
+            tv_nsec: old_result.it_value.tv_nsec.into(),
+        },
+    });
+    Ok(())
+}
+
+#[cfg(feature = "time")]
+#[inline]
+pub(crate) fn timerfd_gettime(fd: BorrowedFd<'_>) -> io::Result<Itimerspec> {
+    let mut result = MaybeUninit::<Itimerspec>::uninit();
+
+    #[cfg(target_pointer_width = "64")]
+    unsafe {
+        ret(syscall!(__NR_timerfd_gettime, fd, &mut result))?;
+        Ok(result.assume_init())
+    }
+
+    #[cfg(target_pointer_width = "32")]
+    unsafe {
+        ret(syscall!(__NR_timerfd_gettime64, fd, &mut result)).or_else(|err| {
+            // See the comments in `rustix_clock_gettime_via_syscall` about
+            // emulation.
+            if err == io::Errno::NOSYS {
+                timerfd_gettime_old(fd, &mut result)
+            } else {
+                Err(err)
+            }
+        })?;
+        Ok(result.assume_init())
+    }
+}
+
+#[cfg(feature = "time")]
+#[cfg(target_pointer_width = "32")]
+unsafe fn timerfd_gettime_old(
+    fd: BorrowedFd<'_>,
+    result: &mut MaybeUninit<Itimerspec>,
+) -> io::Result<()> {
+    let mut old_result = MaybeUninit::<__kernel_old_itimerspec>::uninit();
+    ret(syscall!(__NR_timerfd_gettime, fd, &mut old_result))?;
+    let old_result = old_result.assume_init();
+    result.write(Itimerspec {
+        it_interval: Timespec {
+            tv_sec: old_result.it_interval.tv_sec.into(),
+            tv_nsec: old_result.it_interval.tv_nsec.into(),
+        },
+        it_value: Timespec {
+            tv_sec: old_result.it_value.tv_sec.into(),
+            tv_nsec: old_result.it_value.tv_nsec.into(),
+        },
+    });
+    Ok(())
+}
diff --git a/vendor/rustix/src/backend/linux_raw/time/types.rs b/vendor/rustix/src/backend/linux_raw/time/types.rs
new file mode 100644
index 0000000..c26812c
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/time/types.rs
@@ -0,0 +1,100 @@
+use crate::backend::c;
+use bitflags::bitflags;
+
+/// `struct itimerspec` for use with [`timerfd_gettime`] and
+/// [`timerfd_settime`].
+///
+/// [`timerfd_gettime`]: crate::time::timerfd_gettime
+/// [`timerfd_settime`]: crate::time::timerfd_settime
+pub type Itimerspec = linux_raw_sys::general::__kernel_itimerspec;
+
+bitflags! {
+    /// `TFD_*` flags for use with [`timerfd_create`].
+    ///
+    /// [`timerfd_create`]: crate::time::timerfd_create
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct TimerfdFlags: c::c_uint {
+        /// `TFD_NONBLOCK`
+        #[doc(alias = "TFD_NONBLOCK")]
+        const NONBLOCK = linux_raw_sys::general::TFD_NONBLOCK;
+
+        /// `TFD_CLOEXEC`
+        #[doc(alias = "TFD_CLOEXEC")]
+        const CLOEXEC = linux_raw_sys::general::TFD_CLOEXEC;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `TFD_TIMER_*` flags for use with [`timerfd_settime`].
+    ///
+    /// [`timerfd_settime`]: crate::time::timerfd_settime
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct TimerfdTimerFlags: c::c_uint {
+        /// `TFD_TIMER_ABSTIME`
+        #[doc(alias = "TFD_TIMER_ABSTIME")]
+        const ABSTIME = linux_raw_sys::general::TFD_TIMER_ABSTIME;
+
+        /// `TFD_TIMER_CANCEL_ON_SET`
+        #[doc(alias = "TFD_TIMER_CANCEL_ON_SET")]
+        const CANCEL_ON_SET = linux_raw_sys::general::TFD_TIMER_CANCEL_ON_SET;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `CLOCK_*` constants for use with [`timerfd_create`].
+///
+/// [`timerfd_create`]: crate::time::timerfd_create
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+#[repr(u32)]
+#[non_exhaustive]
+pub enum TimerfdClockId {
+    /// `CLOCK_REALTIME`—A clock that tells the “real” time.
+    ///
+    /// This is a clock that tells the amount of time elapsed since the Unix
+    /// epoch, 1970-01-01T00:00:00Z. The clock is externally settable, so it is
+    /// not monotonic. Successive reads may see decreasing times, so it isn't
+    /// reliable for measuring durations.
+    #[doc(alias = "CLOCK_REALTIME")]
+    Realtime = linux_raw_sys::general::CLOCK_REALTIME,
+
+    /// `CLOCK_MONOTONIC`—A clock that tells an abstract time.
+    ///
+    /// Unlike `Realtime`, this clock is not based on a fixed known epoch, so
+    /// individual times aren't meaningful. However, since it isn't settable,
+    /// it is reliable for measuring durations.
+    ///
+    /// This clock does not advance while the system is suspended; see
+    /// `Boottime` for a clock that does.
+    #[doc(alias = "CLOCK_MONOTONIC")]
+    Monotonic = linux_raw_sys::general::CLOCK_MONOTONIC,
+
+    /// `CLOCK_BOOTTIME`—Like `Monotonic`, but advances while suspended.
+    ///
+    /// This clock is similar to `Monotonic`, but does advance while the system
+    /// is suspended.
+    #[doc(alias = "CLOCK_BOOTTIME")]
+    Boottime = linux_raw_sys::general::CLOCK_BOOTTIME,
+
+    /// `CLOCK_REALTIME_ALARM`—Like `Realtime`, but wakes a suspended system.
+    ///
+    /// This clock is like `Realtime`, but can wake up a suspended system.
+    ///
+    /// Use of this clock requires the `CAP_WAKE_ALARM` Linux capability.
+    #[doc(alias = "CLOCK_REALTIME_ALARM")]
+    RealtimeAlarm = linux_raw_sys::general::CLOCK_REALTIME_ALARM,
+
+    /// `CLOCK_BOOTTIME_ALARM`—Like `Boottime`, but wakes a suspended system.
+    ///
+    /// This clock is like `Boottime`, but can wake up a suspended system.
+    ///
+    /// Use of this clock requires the `CAP_WAKE_ALARM` Linux capability.
+    #[doc(alias = "CLOCK_BOOTTIME_ALARM")]
+    BoottimeAlarm = linux_raw_sys::general::CLOCK_BOOTTIME_ALARM,
+}
diff --git a/vendor/rustix/src/backend/linux_raw/ugid/mod.rs b/vendor/rustix/src/backend/linux_raw/ugid/mod.rs
new file mode 100644
index 0000000..ef944f0
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/ugid/mod.rs
@@ -0,0 +1 @@
+pub(crate) mod syscalls;
diff --git a/vendor/rustix/src/backend/linux_raw/ugid/syscalls.rs b/vendor/rustix/src/backend/linux_raw/ugid/syscalls.rs
new file mode 100644
index 0000000..5f1551e
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/ugid/syscalls.rs
@@ -0,0 +1,66 @@
+//! linux_raw syscalls for UIDs and GIDs
+//!
+//! # Safety
+//!
+//! See the `rustix::backend` module documentation for details.
+#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
+
+use crate::backend::c;
+use crate::backend::conv::ret_usize_infallible;
+use crate::ugid::{Gid, Uid};
+
+#[inline]
+pub(crate) fn getuid() -> Uid {
+    #[cfg(any(target_arch = "arm", target_arch = "sparc", target_arch = "x86"))]
+    unsafe {
+        let uid = ret_usize_infallible(syscall_readonly!(__NR_getuid32)) as c::uid_t;
+        Uid::from_raw(uid)
+    }
+    #[cfg(not(any(target_arch = "arm", target_arch = "sparc", target_arch = "x86")))]
+    unsafe {
+        let uid = ret_usize_infallible(syscall_readonly!(__NR_getuid)) as c::uid_t;
+        Uid::from_raw(uid)
+    }
+}
+
+#[inline]
+pub(crate) fn geteuid() -> Uid {
+    #[cfg(any(target_arch = "arm", target_arch = "sparc", target_arch = "x86"))]
+    unsafe {
+        let uid = ret_usize_infallible(syscall_readonly!(__NR_geteuid32)) as c::uid_t;
+        Uid::from_raw(uid)
+    }
+    #[cfg(not(any(target_arch = "arm", target_arch = "sparc", target_arch = "x86")))]
+    unsafe {
+        let uid = ret_usize_infallible(syscall_readonly!(__NR_geteuid)) as c::uid_t;
+        Uid::from_raw(uid)
+    }
+}
+
+#[inline]
+pub(crate) fn getgid() -> Gid {
+    #[cfg(any(target_arch = "arm", target_arch = "sparc", target_arch = "x86"))]
+    unsafe {
+        let gid = ret_usize_infallible(syscall_readonly!(__NR_getgid32)) as c::gid_t;
+        Gid::from_raw(gid)
+    }
+    #[cfg(not(any(target_arch = "arm", target_arch = "sparc", target_arch = "x86")))]
+    unsafe {
+        let gid = ret_usize_infallible(syscall_readonly!(__NR_getgid)) as c::gid_t;
+        Gid::from_raw(gid)
+    }
+}
+
+#[inline]
+pub(crate) fn getegid() -> Gid {
+    #[cfg(any(target_arch = "arm", target_arch = "sparc", target_arch = "x86"))]
+    unsafe {
+        let gid = ret_usize_infallible(syscall_readonly!(__NR_getegid32)) as c::gid_t;
+        Gid::from_raw(gid)
+    }
+    #[cfg(not(any(target_arch = "arm", target_arch = "sparc", target_arch = "x86")))]
+    unsafe {
+        let gid = ret_usize_infallible(syscall_readonly!(__NR_getegid)) as c::gid_t;
+        Gid::from_raw(gid)
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/vdso.rs b/vendor/rustix/src/backend/linux_raw/vdso.rs
new file mode 100644
index 0000000..102fa6b
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/vdso.rs
@@ -0,0 +1,313 @@
+//! Parse the Linux vDSO.
+//!
+//! The following code is transliterated from
+//! tools/testing/selftests/vDSO/parse_vdso.c in Linux 5.11, which is licensed
+//! with Creative Commons Zero License, version 1.0,
+//! available at <https://creativecommons.org/publicdomain/zero/1.0/legalcode>
+//!
+//! # Safety
+//!
+//! Parsing the vDSO involves a lot of raw pointer manipulation. This
+//! implementation follows Linux's reference implementation, and adds several
+//! additional safety checks.
+#![allow(unsafe_code)]
+
+use super::c;
+use crate::ffi::CStr;
+use crate::utils::check_raw_pointer;
+use core::ffi::c_void;
+use core::mem::size_of;
+use core::ptr::{null, null_mut};
+use linux_raw_sys::elf::*;
+
+pub(super) struct Vdso {
+    // Load information
+    load_addr: *const Elf_Ehdr,
+    load_end: *const c_void, // the end of the `PT_LOAD` segment
+    pv_offset: usize,        // recorded paddr - recorded vaddr
+
+    // Symbol table
+    symtab: *const Elf_Sym,
+    symstrings: *const u8,
+    bucket: *const u32,
+    chain: *const u32,
+    nbucket: u32,
+    //nchain: u32,
+
+    // Version table
+    versym: *const u16,
+    verdef: *const Elf_Verdef,
+}
+
+// Straight from the ELF specification.
+fn elf_hash(name: &CStr) -> u32 {
+    let mut h: u32 = 0;
+    for b in name.to_bytes() {
+        h = (h << 4).wrapping_add(u32::from(*b));
+        let g = h & 0xf000_0000;
+        if g != 0 {
+            h ^= g >> 24;
+        }
+        h &= !g;
+    }
+    h
+}
+
+/// Create a `Vdso` value by parsing the vDSO at the `sysinfo_ehdr` address.
+fn init_from_sysinfo_ehdr() -> Option<Vdso> {
+    // SAFETY: The auxv initialization code does extensive checks to ensure
+    // that the value we get really is an `AT_SYSINFO_EHDR` value from the
+    // kernel.
+    unsafe {
+        let hdr = super::param::auxv::sysinfo_ehdr();
+
+        // If the platform doesn't provide a `AT_SYSINFO_EHDR`, we can't locate
+        // the vDSO.
+        if hdr.is_null() {
+            return None;
+        }
+
+        let mut vdso = Vdso {
+            load_addr: hdr,
+            load_end: hdr.cast(),
+            pv_offset: 0,
+            symtab: null(),
+            symstrings: null(),
+            bucket: null(),
+            chain: null(),
+            nbucket: 0,
+            //nchain: 0,
+            versym: null(),
+            verdef: null(),
+        };
+
+        let hdr = &*hdr;
+        let pt = check_raw_pointer::<Elf_Phdr>(vdso.base_plus(hdr.e_phoff)? as *mut _)?.as_ptr();
+        let mut dyn_: *const Elf_Dyn = null();
+        let mut num_dyn = 0;
+
+        // We need two things from the segment table: the load offset
+        // and the dynamic table.
+        let mut found_vaddr = false;
+        for i in 0..hdr.e_phnum {
+            let phdr = &*pt.add(i as usize);
+            if phdr.p_flags & PF_W != 0 {
+                // Don't trust any vDSO that claims to be loading writable
+                // segments into memory.
+                return None;
+            }
+            if phdr.p_type == PT_LOAD && !found_vaddr {
+                // The segment should be readable and executable, because it
+                // contains the symbol table and the function bodies.
+                if phdr.p_flags & (PF_R | PF_X) != (PF_R | PF_X) {
+                    return None;
+                }
+                found_vaddr = true;
+                vdso.load_end = vdso.base_plus(phdr.p_offset.checked_add(phdr.p_memsz)?)?;
+                vdso.pv_offset = phdr.p_offset.wrapping_sub(phdr.p_vaddr);
+            } else if phdr.p_type == PT_DYNAMIC {
+                // If `p_offset` is zero, it's more likely that we're looking
+                // at memory that has been zeroed than that the kernel has
+                // somehow aliased the `Ehdr` and the `Elf_Dyn` array.
+                if phdr.p_offset < size_of::<Elf_Ehdr>() {
+                    return None;
+                }
+
+                dyn_ = check_raw_pointer::<Elf_Dyn>(vdso.base_plus(phdr.p_offset)? as *mut _)?
+                    .as_ptr();
+                num_dyn = phdr.p_memsz / size_of::<Elf_Dyn>();
+            } else if phdr.p_type == PT_INTERP || phdr.p_type == PT_GNU_RELRO {
+                // Don't trust any ELF image that has an “interpreter” or
+                // that uses RELRO, which is likely to be a user ELF image
+                // rather and not the kernel vDSO.
+                return None;
+            }
+        }
+
+        if !found_vaddr || dyn_.is_null() {
+            return None; // Failed
+        }
+
+        // Fish out the useful bits of the dynamic table.
+        let mut hash: *const u32 = null();
+        vdso.symstrings = null();
+        vdso.symtab = null();
+        vdso.versym = null();
+        vdso.verdef = null();
+        let mut i = 0;
+        loop {
+            if i == num_dyn {
+                return None;
+            }
+            let d = &*dyn_.add(i);
+            match d.d_tag {
+                DT_STRTAB => {
+                    vdso.symstrings =
+                        check_raw_pointer::<u8>(vdso.addr_from_elf(d.d_un.d_ptr)? as *mut _)?
+                            .as_ptr();
+                }
+                DT_SYMTAB => {
+                    vdso.symtab =
+                        check_raw_pointer::<Elf_Sym>(vdso.addr_from_elf(d.d_un.d_ptr)? as *mut _)?
+                            .as_ptr();
+                }
+                DT_HASH => {
+                    hash = check_raw_pointer::<u32>(vdso.addr_from_elf(d.d_un.d_ptr)? as *mut _)?
+                        .as_ptr();
+                }
+                DT_VERSYM => {
+                    vdso.versym =
+                        check_raw_pointer::<u16>(vdso.addr_from_elf(d.d_un.d_ptr)? as *mut _)?
+                            .as_ptr();
+                }
+                DT_VERDEF => {
+                    vdso.verdef = check_raw_pointer::<Elf_Verdef>(
+                        vdso.addr_from_elf(d.d_un.d_ptr)? as *mut _,
+                    )?
+                    .as_ptr();
+                }
+                DT_SYMENT => {
+                    if d.d_un.d_ptr != size_of::<Elf_Sym>() {
+                        return None; // Failed
+                    }
+                }
+                DT_NULL => break,
+                _ => {}
+            }
+            i = i.checked_add(1)?;
+        }
+        // The upstream code checks `symstrings`, `symtab`, and `hash` for
+        // null; here, `check_raw_pointer` has already done that.
+
+        if vdso.verdef.is_null() {
+            vdso.versym = null();
+        }
+
+        // Parse the hash table header.
+        vdso.nbucket = *hash.add(0);
+        //vdso.nchain = *hash.add(1);
+        vdso.bucket = hash.add(2);
+        vdso.chain = hash.add(vdso.nbucket as usize + 2);
+
+        // That's all we need.
+        Some(vdso)
+    }
+}
+
+impl Vdso {
+    /// Parse the vDSO.
+    ///
+    /// Returns `None` if the vDSO can't be located or if it doesn't conform to
+    /// our expectations.
+    #[inline]
+    pub(super) fn new() -> Option<Self> {
+        init_from_sysinfo_ehdr()
+    }
+
+    /// Check the version for a symbol.
+    ///
+    /// # Safety
+    ///
+    /// The raw pointers inside `self` must be valid.
+    unsafe fn match_version(&self, mut ver: u16, name: &CStr, hash: u32) -> bool {
+        // This is a helper function to check if the version indexed by
+        // ver matches name (which hashes to hash).
+        //
+        // The version definition table is a mess, and I don't know how
+        // to do this in better than linear time without allocating memory
+        // to build an index. I also don't know why the table has
+        // variable size entries in the first place.
+        //
+        // For added fun, I can't find a comprehensible specification of how
+        // to parse all the weird flags in the table.
+        //
+        // So I just parse the whole table every time.
+
+        // First step: find the version definition
+        ver &= 0x7fff; // Apparently bit 15 means "hidden"
+        let mut def = self.verdef;
+        loop {
+            if (*def).vd_version != VER_DEF_CURRENT {
+                return false; // Failed
+            }
+
+            if ((*def).vd_flags & VER_FLG_BASE) == 0 && ((*def).vd_ndx & 0x7fff) == ver {
+                break;
+            }
+
+            if (*def).vd_next == 0 {
+                return false; // No definition.
+            }
+
+            def = def
+                .cast::<u8>()
+                .add((*def).vd_next as usize)
+                .cast::<Elf_Verdef>();
+        }
+
+        // Now figure out whether it matches.
+        let aux = &*(def.cast::<u8>())
+            .add((*def).vd_aux as usize)
+            .cast::<Elf_Verdaux>();
+        (*def).vd_hash == hash
+            && (name == CStr::from_ptr(self.symstrings.add(aux.vda_name as usize).cast()))
+    }
+
+    /// Look up a symbol in the vDSO.
+    pub(super) fn sym(&self, version: &CStr, name: &CStr) -> *mut c::c_void {
+        let ver_hash = elf_hash(version);
+        let name_hash = elf_hash(name);
+
+        // SAFETY: The pointers in `self` must be valid.
+        unsafe {
+            let mut chain = *self.bucket.add((name_hash % self.nbucket) as usize);
+
+            while chain != STN_UNDEF {
+                let sym = &*self.symtab.add(chain as usize);
+
+                // Check for a defined global or weak function w/ right name.
+                //
+                // The reference parser in Linux's parse_vdso.c requires
+                // symbols to have type `STT_FUNC`, but on powerpc64, the vDSO
+                // uses `STT_NOTYPE`, so allow that too.
+                if (ELF_ST_TYPE(sym.st_info) != STT_FUNC &&
+                        ELF_ST_TYPE(sym.st_info) != STT_NOTYPE)
+                    || (ELF_ST_BIND(sym.st_info) != STB_GLOBAL
+                        && ELF_ST_BIND(sym.st_info) != STB_WEAK)
+                    || sym.st_shndx == SHN_UNDEF
+                    || sym.st_shndx == SHN_ABS
+                    || ELF_ST_VISIBILITY(sym.st_other) != STV_DEFAULT
+                    || (name != CStr::from_ptr(self.symstrings.add(sym.st_name as usize).cast()))
+                    // Check symbol version.
+                    || (!self.versym.is_null()
+                        && !self.match_version(*self.versym.add(chain as usize), version, ver_hash))
+                {
+                    chain = *self.chain.add(chain as usize);
+                    continue;
+                }
+
+                let sum = self.addr_from_elf(sym.st_value).unwrap();
+                assert!(
+                    sum as usize >= self.load_addr as usize
+                        && sum as usize <= self.load_end as usize
+                );
+                return sum as *mut c::c_void;
+            }
+        }
+
+        null_mut()
+    }
+
+    /// Add the given address to the vDSO base address.
+    unsafe fn base_plus(&self, offset: usize) -> Option<*const c_void> {
+        // Check for overflow.
+        let _ = (self.load_addr as usize).checked_add(offset)?;
+        // Add the offset to the base.
+        Some(self.load_addr.cast::<u8>().add(offset).cast())
+    }
+
+    /// Translate an ELF-address-space address into a usable virtual address.
+    unsafe fn addr_from_elf(&self, elf_addr: usize) -> Option<*const c_void> {
+        self.base_plus(elf_addr.wrapping_add(self.pv_offset))
+    }
+}
diff --git a/vendor/rustix/src/backend/linux_raw/vdso_wrappers.rs b/vendor/rustix/src/backend/linux_raw/vdso_wrappers.rs
new file mode 100644
index 0000000..441738f
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/vdso_wrappers.rs
@@ -0,0 +1,608 @@
+//! Implement syscalls using the vDSO.
+//!
+//! <https://man7.org/linux/man-pages/man7/vdso.7.html>
+//!
+//! # Safety
+//!
+//! Similar to syscalls.rs, this file performs raw system calls, and sometimes
+//! passes them uninitialized memory buffers. This file also calls vDSO
+//! functions.
+#![allow(unsafe_code)]
+
+#[cfg(target_arch = "x86")]
+use super::reg::{ArgReg, RetReg, SyscallNumber, A0, A1, A2, A3, A4, A5, R0};
+use super::vdso;
+#[cfg(target_arch = "x86")]
+use core::arch::global_asm;
+#[cfg(feature = "process")]
+#[cfg(any(
+    target_arch = "x86_64",
+    target_arch = "x86",
+    target_arch = "riscv64",
+    target_arch = "powerpc64"
+))]
+use core::ffi::c_void;
+use core::mem::transmute;
+use core::ptr::null_mut;
+use core::sync::atomic::AtomicPtr;
+use core::sync::atomic::Ordering::Relaxed;
+#[cfg(target_pointer_width = "32")]
+#[cfg(feature = "time")]
+use linux_raw_sys::general::timespec as __kernel_old_timespec;
+#[cfg(any(
+    all(
+        feature = "process",
+        any(
+            target_arch = "x86_64",
+            target_arch = "x86",
+            target_arch = "riscv64",
+            target_arch = "powerpc64"
+        )
+    ),
+    feature = "time"
+))]
+use {super::c, super::conv::ret, core::mem::MaybeUninit};
+#[cfg(feature = "time")]
+use {
+    super::conv::c_int,
+    crate::clockid::{ClockId, DynamicClockId},
+    crate::io,
+    crate::timespec::Timespec,
+    linux_raw_sys::general::{__kernel_clockid_t, __kernel_timespec},
+};
+
+#[cfg(feature = "time")]
+#[inline]
+pub(crate) fn clock_gettime(which_clock: ClockId) -> __kernel_timespec {
+    // SAFETY: `CLOCK_GETTIME` contains either null or the address of a
+    // function with an ABI like libc `clock_gettime`, and calling it has the
+    // side effect of writing to the result buffer, and no others.
+    unsafe {
+        let mut result = MaybeUninit::<__kernel_timespec>::uninit();
+        let callee = match transmute(CLOCK_GETTIME.load(Relaxed)) {
+            Some(callee) => callee,
+            None => init_clock_gettime(),
+        };
+        let r0 = callee(which_clock as c::c_int, result.as_mut_ptr());
+        // The `ClockId` enum only contains clocks which never fail. It may be
+        // tempting to change this to `debug_assert_eq`, however they can still
+        // fail on uncommon kernel configs, so we leave this in place to ensure
+        // that we don't execute undefined behavior if they ever do fail.
+        assert_eq!(r0, 0);
+        result.assume_init()
+    }
+}
+
+#[cfg(feature = "time")]
+#[inline]
+pub(crate) fn clock_gettime_dynamic(which_clock: DynamicClockId<'_>) -> io::Result<Timespec> {
+    let id = match which_clock {
+        DynamicClockId::Known(id) => id as __kernel_clockid_t,
+
+        DynamicClockId::Dynamic(fd) => {
+            // See `FD_TO_CLOCKID` in Linux's `clock_gettime` documentation.
+            use crate::backend::fd::AsRawFd;
+            const CLOCKFD: i32 = 3;
+            ((!fd.as_raw_fd() << 3) | CLOCKFD) as __kernel_clockid_t
+        }
+
+        DynamicClockId::RealtimeAlarm => c::CLOCK_REALTIME_ALARM as __kernel_clockid_t,
+        DynamicClockId::Tai => c::CLOCK_TAI as __kernel_clockid_t,
+        DynamicClockId::Boottime => c::CLOCK_BOOTTIME as __kernel_clockid_t,
+        DynamicClockId::BoottimeAlarm => c::CLOCK_BOOTTIME_ALARM as __kernel_clockid_t,
+    };
+
+    // SAFETY: `CLOCK_GETTIME` contains either null or the address of a
+    // function with an ABI like libc `clock_gettime`, and calling it has the
+    // side effect of writing to the result buffer, and no others.
+    unsafe {
+        const EINVAL: c::c_int = -(c::EINVAL as c::c_int);
+        let mut timespec = MaybeUninit::<Timespec>::uninit();
+        let callee = match transmute(CLOCK_GETTIME.load(Relaxed)) {
+            Some(callee) => callee,
+            None => init_clock_gettime(),
+        };
+        match callee(id, timespec.as_mut_ptr()) {
+            0 => (),
+            EINVAL => return Err(io::Errno::INVAL),
+            _ => _rustix_clock_gettime_via_syscall(id, timespec.as_mut_ptr())?,
+        }
+        Ok(timespec.assume_init())
+    }
+}
+
+#[cfg(feature = "process")]
+#[cfg(any(
+    target_arch = "x86_64",
+    target_arch = "x86",
+    target_arch = "riscv64",
+    target_arch = "powerpc64"
+))]
+#[inline]
+pub(crate) fn sched_getcpu() -> usize {
+    // SAFETY: `GETCPU` contains either null or the address of a function with
+    // an ABI like libc `getcpu`, and calling it has the side effect of writing
+    // to the result buffers, and no others.
+    unsafe {
+        let mut cpu = MaybeUninit::<u32>::uninit();
+        let callee = match transmute(GETCPU.load(Relaxed)) {
+            Some(callee) => callee,
+            None => init_getcpu(),
+        };
+        let r0 = callee(cpu.as_mut_ptr(), null_mut(), null_mut());
+        debug_assert_eq!(r0, 0);
+        cpu.assume_init() as usize
+    }
+}
+
+#[cfg(target_arch = "x86")]
+pub(super) mod x86_via_vdso {
+    use super::{transmute, ArgReg, Relaxed, RetReg, SyscallNumber, A0, A1, A2, A3, A4, A5, R0};
+    use crate::backend::arch::asm;
+
+    #[inline]
+    pub(in crate::backend) unsafe fn syscall0(nr: SyscallNumber<'_>) -> RetReg<R0> {
+        let callee = match transmute(super::SYSCALL.load(Relaxed)) {
+            Some(callee) => callee,
+            None => super::init_syscall(),
+        };
+        asm::indirect_syscall0(callee, nr)
+    }
+
+    #[inline]
+    pub(in crate::backend) unsafe fn syscall1<'a>(
+        nr: SyscallNumber<'a>,
+        a0: ArgReg<'a, A0>,
+    ) -> RetReg<R0> {
+        let callee = match transmute(super::SYSCALL.load(Relaxed)) {
+            Some(callee) => callee,
+            None => super::init_syscall(),
+        };
+        asm::indirect_syscall1(callee, nr, a0)
+    }
+
+    #[inline]
+    pub(in crate::backend) unsafe fn syscall1_noreturn<'a>(
+        nr: SyscallNumber<'a>,
+        a0: ArgReg<'a, A0>,
+    ) -> ! {
+        let callee = match transmute(super::SYSCALL.load(Relaxed)) {
+            Some(callee) => callee,
+            None => super::init_syscall(),
+        };
+        asm::indirect_syscall1_noreturn(callee, nr, a0)
+    }
+
+    #[inline]
+    pub(in crate::backend) unsafe fn syscall2<'a>(
+        nr: SyscallNumber<'a>,
+        a0: ArgReg<'a, A0>,
+        a1: ArgReg<'a, A1>,
+    ) -> RetReg<R0> {
+        let callee = match transmute(super::SYSCALL.load(Relaxed)) {
+            Some(callee) => callee,
+            None => super::init_syscall(),
+        };
+        asm::indirect_syscall2(callee, nr, a0, a1)
+    }
+
+    #[inline]
+    pub(in crate::backend) unsafe fn syscall3<'a>(
+        nr: SyscallNumber<'a>,
+        a0: ArgReg<'a, A0>,
+        a1: ArgReg<'a, A1>,
+        a2: ArgReg<'a, A2>,
+    ) -> RetReg<R0> {
+        let callee = match transmute(super::SYSCALL.load(Relaxed)) {
+            Some(callee) => callee,
+            None => super::init_syscall(),
+        };
+        asm::indirect_syscall3(callee, nr, a0, a1, a2)
+    }
+
+    #[inline]
+    pub(in crate::backend) unsafe fn syscall4<'a>(
+        nr: SyscallNumber<'a>,
+        a0: ArgReg<'a, A0>,
+        a1: ArgReg<'a, A1>,
+        a2: ArgReg<'a, A2>,
+        a3: ArgReg<'a, A3>,
+    ) -> RetReg<R0> {
+        let callee = match transmute(super::SYSCALL.load(Relaxed)) {
+            Some(callee) => callee,
+            None => super::init_syscall(),
+        };
+        asm::indirect_syscall4(callee, nr, a0, a1, a2, a3)
+    }
+
+    #[inline]
+    pub(in crate::backend) unsafe fn syscall5<'a>(
+        nr: SyscallNumber<'a>,
+        a0: ArgReg<'a, A0>,
+        a1: ArgReg<'a, A1>,
+        a2: ArgReg<'a, A2>,
+        a3: ArgReg<'a, A3>,
+        a4: ArgReg<'a, A4>,
+    ) -> RetReg<R0> {
+        let callee = match transmute(super::SYSCALL.load(Relaxed)) {
+            Some(callee) => callee,
+            None => super::init_syscall(),
+        };
+        asm::indirect_syscall5(callee, nr, a0, a1, a2, a3, a4)
+    }
+
+    #[inline]
+    pub(in crate::backend) unsafe fn syscall6<'a>(
+        nr: SyscallNumber<'a>,
+        a0: ArgReg<'a, A0>,
+        a1: ArgReg<'a, A1>,
+        a2: ArgReg<'a, A2>,
+        a3: ArgReg<'a, A3>,
+        a4: ArgReg<'a, A4>,
+        a5: ArgReg<'a, A5>,
+    ) -> RetReg<R0> {
+        let callee = match transmute(super::SYSCALL.load(Relaxed)) {
+            Some(callee) => callee,
+            None => super::init_syscall(),
+        };
+        asm::indirect_syscall6(callee, nr, a0, a1, a2, a3, a4, a5)
+    }
+
+    // With the indirect call, it isn't meaningful to do a separate
+    // `_readonly` optimization.
+    #[allow(unused_imports)]
+    pub(in crate::backend) use {
+        syscall0 as syscall0_readonly, syscall1 as syscall1_readonly,
+        syscall2 as syscall2_readonly, syscall3 as syscall3_readonly,
+        syscall4 as syscall4_readonly, syscall5 as syscall5_readonly,
+        syscall6 as syscall6_readonly,
+    };
+}
+
+#[cfg(feature = "time")]
+type ClockGettimeType = unsafe extern "C" fn(c::c_int, *mut Timespec) -> c::c_int;
+
+#[cfg(feature = "process")]
+#[cfg(any(
+    target_arch = "x86_64",
+    target_arch = "x86",
+    target_arch = "riscv64",
+    target_arch = "powerpc64"
+))]
+type GetcpuType = unsafe extern "C" fn(*mut u32, *mut u32, *mut c_void) -> c::c_int;
+
+/// The underlying syscall functions are only called from asm, using the
+/// special syscall calling convention to pass arguments and return values,
+/// which the signature here doesn't reflect.
+#[cfg(target_arch = "x86")]
+pub(super) type SyscallType = unsafe extern "C" fn();
+
+/// Initialize `CLOCK_GETTIME` and return its value.
+#[cfg(feature = "time")]
+#[cold]
+fn init_clock_gettime() -> ClockGettimeType {
+    init();
+    // SAFETY: Load the function address from static storage that we just
+    // initialized.
+    unsafe { transmute(CLOCK_GETTIME.load(Relaxed)) }
+}
+
+/// Initialize `GETCPU` and return its value.
+#[cfg(feature = "process")]
+#[cfg(any(
+    target_arch = "x86_64",
+    target_arch = "x86",
+    target_arch = "riscv64",
+    target_arch = "powerpc64"
+))]
+#[cold]
+fn init_getcpu() -> GetcpuType {
+    init();
+    // SAFETY: Load the function address from static storage that we just
+    // initialized.
+    unsafe { transmute(GETCPU.load(Relaxed)) }
+}
+
+/// Initialize `SYSCALL` and return its value.
+#[cfg(target_arch = "x86")]
+#[cold]
+fn init_syscall() -> SyscallType {
+    init();
+    // SAFETY: Load the function address from static storage that we just
+    // initialized.
+    unsafe { transmute(SYSCALL.load(Relaxed)) }
+}
+
+/// `AtomicPtr` can't hold a `fn` pointer, so we use a `*` pointer to this
+/// placeholder type, and cast it as needed.
+struct Function;
+#[cfg(feature = "time")]
+static mut CLOCK_GETTIME: AtomicPtr<Function> = AtomicPtr::new(null_mut());
+#[cfg(feature = "process")]
+#[cfg(any(
+    target_arch = "x86_64",
+    target_arch = "x86",
+    target_arch = "riscv64",
+    target_arch = "powerpc64"
+))]
+static mut GETCPU: AtomicPtr<Function> = AtomicPtr::new(null_mut());
+#[cfg(target_arch = "x86")]
+static mut SYSCALL: AtomicPtr<Function> = AtomicPtr::new(null_mut());
+
+#[cfg(feature = "time")]
+unsafe extern "C" fn rustix_clock_gettime_via_syscall(
+    clockid: c::c_int,
+    res: *mut Timespec,
+) -> c::c_int {
+    match _rustix_clock_gettime_via_syscall(clockid, res) {
+        Ok(()) => 0,
+        Err(err) => err.raw_os_error().wrapping_neg(),
+    }
+}
+
+#[cfg(feature = "time")]
+#[cfg(target_pointer_width = "32")]
+unsafe fn _rustix_clock_gettime_via_syscall(
+    clockid: c::c_int,
+    res: *mut Timespec,
+) -> io::Result<()> {
+    let r0 = syscall!(__NR_clock_gettime64, c_int(clockid), res);
+    match ret(r0) {
+        Err(io::Errno::NOSYS) => _rustix_clock_gettime_via_syscall_old(clockid, res),
+        otherwise => otherwise,
+    }
+}
+
+#[cfg(feature = "time")]
+#[cfg(target_pointer_width = "32")]
+unsafe fn _rustix_clock_gettime_via_syscall_old(
+    clockid: c::c_int,
+    res: *mut Timespec,
+) -> io::Result<()> {
+    // Ordinarily `rustix` doesn't like to emulate system calls, but in the
+    // case of time APIs, it's specific to Linux, specific to 32-bit
+    // architectures *and* specific to old kernel versions, and it's not that
+    // hard to fix up here, so that no other code needs to worry about this.
+    let mut old_result = MaybeUninit::<__kernel_old_timespec>::uninit();
+    let r0 = syscall!(__NR_clock_gettime, c_int(clockid), &mut old_result);
+    match ret(r0) {
+        Ok(()) => {
+            let old_result = old_result.assume_init();
+            *res = Timespec {
+                tv_sec: old_result.tv_sec.into(),
+                tv_nsec: old_result.tv_nsec.into(),
+            };
+            Ok(())
+        }
+        otherwise => otherwise,
+    }
+}
+
+#[cfg(feature = "time")]
+#[cfg(target_pointer_width = "64")]
+unsafe fn _rustix_clock_gettime_via_syscall(
+    clockid: c::c_int,
+    res: *mut Timespec,
+) -> io::Result<()> {
+    ret(syscall!(__NR_clock_gettime, c_int(clockid), res))
+}
+
+#[cfg(feature = "process")]
+#[cfg(any(
+    target_arch = "x86_64",
+    target_arch = "x86",
+    target_arch = "riscv64",
+    target_arch = "powerpc64"
+))]
+unsafe extern "C" fn rustix_getcpu_via_syscall(
+    cpu: *mut u32,
+    node: *mut u32,
+    unused: *mut c_void,
+) -> c::c_int {
+    match ret(syscall!(__NR_getcpu, cpu, node, unused)) {
+        Ok(()) => 0,
+        Err(err) => err.raw_os_error().wrapping_neg(),
+    }
+}
+
+#[cfg(target_arch = "x86")]
+extern "C" {
+    /// A symbol pointing to an `int 0x80` instruction. This “function” is only
+    /// called from assembly, and only with the x86 syscall calling convention,
+    /// so its signature here is not its true signature.
+    ///
+    /// This extern block and the `global_asm!` below can be replaced with
+    /// `#[naked]` if it's stabilized.
+    fn rustix_int_0x80();
+}
+
+#[cfg(target_arch = "x86")]
+global_asm!(
+    r#"
+    .section    .text.rustix_int_0x80,"ax",@progbits
+    .p2align    4
+    .weak       rustix_int_0x80
+    .hidden     rustix_int_0x80
+    .type       rustix_int_0x80, @function
+rustix_int_0x80:
+    .cfi_startproc
+    int    0x80
+    ret
+    .cfi_endproc
+    .size rustix_int_0x80, .-rustix_int_0x80
+"#
+);
+
+fn minimal_init() {
+    // SAFETY: Store default function addresses in static storage so that if we
+    // end up making any system calls while we read the vDSO, they'll work. If
+    // the memory happens to already be initialized, this is redundant, but not
+    // harmful.
+    unsafe {
+        #[cfg(feature = "time")]
+        {
+            CLOCK_GETTIME
+                .compare_exchange(
+                    null_mut(),
+                    rustix_clock_gettime_via_syscall as *mut Function,
+                    Relaxed,
+                    Relaxed,
+                )
+                .ok();
+        }
+
+        #[cfg(feature = "process")]
+        #[cfg(any(
+            target_arch = "x86_64",
+            target_arch = "x86",
+            target_arch = "riscv64",
+            target_arch = "powerpc64"
+        ))]
+        {
+            GETCPU
+                .compare_exchange(
+                    null_mut(),
+                    rustix_getcpu_via_syscall as *mut Function,
+                    Relaxed,
+                    Relaxed,
+                )
+                .ok();
+        }
+
+        #[cfg(target_arch = "x86")]
+        {
+            SYSCALL
+                .compare_exchange(
+                    null_mut(),
+                    rustix_int_0x80 as *mut Function,
+                    Relaxed,
+                    Relaxed,
+                )
+                .ok();
+        }
+    }
+}
+
+fn init() {
+    minimal_init();
+
+    if let Some(vdso) = vdso::Vdso::new() {
+        #[cfg(feature = "time")]
+        {
+            // Look up the platform-specific `clock_gettime` symbol as
+            // documented [here], except on 32-bit platforms where we look up
+            // the `64`-suffixed variant and fail if we don't find it.
+            //
+            // [here]: https://man7.org/linux/man-pages/man7/vdso.7.html
+            #[cfg(target_arch = "x86_64")]
+            let ptr = vdso.sym(cstr!("LINUX_2.6"), cstr!("__vdso_clock_gettime"));
+            #[cfg(target_arch = "arm")]
+            let ptr = vdso.sym(cstr!("LINUX_2.6"), cstr!("__vdso_clock_gettime64"));
+            #[cfg(target_arch = "aarch64")]
+            let ptr = vdso.sym(cstr!("LINUX_2.6.39"), cstr!("__kernel_clock_gettime"));
+            #[cfg(target_arch = "x86")]
+            let ptr = vdso.sym(cstr!("LINUX_2.6"), cstr!("__vdso_clock_gettime64"));
+            #[cfg(target_arch = "riscv64")]
+            let ptr = vdso.sym(cstr!("LINUX_4.15"), cstr!("__vdso_clock_gettime"));
+            #[cfg(target_arch = "powerpc64")]
+            let ptr = vdso.sym(cstr!("LINUX_2.6.15"), cstr!("__kernel_clock_gettime"));
+            #[cfg(any(target_arch = "mips", target_arch = "mips32r6"))]
+            let ptr = vdso.sym(cstr!("LINUX_2.6"), cstr!("__vdso_clock_gettime64"));
+            #[cfg(any(target_arch = "mips64", target_arch = "mips64r6"))]
+            let ptr = vdso.sym(cstr!("LINUX_2.6"), cstr!("__vdso_clock_gettime"));
+
+            // On all 64-bit platforms, the 64-bit `clock_gettime` symbols are
+            // always available.
+            #[cfg(target_pointer_width = "64")]
+            let ok = true;
+
+            // On some 32-bit platforms, the 64-bit `clock_gettime` symbols are
+            // not available on older kernel versions.
+            #[cfg(any(
+                target_arch = "arm",
+                target_arch = "mips",
+                target_arch = "mips32r6",
+                target_arch = "x86"
+            ))]
+            let ok = !ptr.is_null();
+
+            if ok {
+                assert!(!ptr.is_null());
+
+                // SAFETY: Store the computed function addresses in static
+                // storage so that we don't need to compute it again (but if
+                // we do, it doesn't hurt anything).
+                unsafe {
+                    CLOCK_GETTIME.store(ptr.cast(), Relaxed);
+                }
+            }
+        }
+
+        #[cfg(feature = "process")]
+        #[cfg(any(
+            target_arch = "x86_64",
+            target_arch = "x86",
+            target_arch = "riscv64",
+            target_arch = "powerpc64"
+        ))]
+        {
+            // Look up the platform-specific `getcpu` symbol as documented
+            // [here].
+            //
+            // [here]: https://man7.org/linux/man-pages/man7/vdso.7.html
+            #[cfg(target_arch = "x86_64")]
+            let ptr = vdso.sym(cstr!("LINUX_2.6"), cstr!("__vdso_getcpu"));
+            #[cfg(target_arch = "x86")]
+            let ptr = vdso.sym(cstr!("LINUX_2.6"), cstr!("__vdso_getcpu"));
+            #[cfg(target_arch = "riscv64")]
+            let ptr = vdso.sym(cstr!("LINUX_4.15"), cstr!("__kernel_getcpu"));
+            #[cfg(target_arch = "powerpc64")]
+            let ptr = vdso.sym(cstr!("LINUX_2.6.15"), cstr!("__kernel_getcpu"));
+
+            #[cfg(any(
+                target_arch = "x86_64",
+                target_arch = "riscv64",
+                target_arch = "powerpc64"
+            ))]
+            let ok = true;
+
+            // On 32-bit x86, the symbol doesn't appear present sometimes.
+            #[cfg(target_arch = "x86")]
+            let ok = !ptr.is_null();
+
+            #[cfg(any(
+                target_arch = "aarch64",
+                target_arch = "arm",
+                target_arch = "mips",
+                target_arch = "mips32r6",
+                target_arch = "mips64",
+                target_arch = "mips64r6"
+            ))]
+            let ok = false;
+
+            if ok {
+                assert!(!ptr.is_null());
+
+                // SAFETY: Store the computed function addresses in static
+                // storage so that we don't need to compute it again (but if
+                // we do, it doesn't hurt anything).
+                unsafe {
+                    GETCPU.store(ptr.cast(), Relaxed);
+                }
+            }
+        }
+
+        // On x86, also look up the vsyscall entry point.
+        #[cfg(target_arch = "x86")]
+        {
+            let ptr = vdso.sym(cstr!("LINUX_2.5"), cstr!("__kernel_vsyscall"));
+            assert!(!ptr.is_null());
+
+            // SAFETY: As above, store the computed function addresses in
+            // static storage.
+            unsafe {
+                SYSCALL.store(ptr.cast(), Relaxed);
+            }
+        }
+    }
+}
diff --git a/vendor/rustix/src/bitcast.rs b/vendor/rustix/src/bitcast.rs
new file mode 100644
index 0000000..77e0e63
--- /dev/null
+++ b/vendor/rustix/src/bitcast.rs
@@ -0,0 +1,34 @@
+//! The `bitcast` and `bitflags_bits` macros.
+
+#![allow(unused_macros)]
+
+// Ensure that the source and destination types are both primitive integer
+// types and the same size, and then bitcast.
+macro_rules! bitcast {
+    ($x:expr) => {{
+        if false {
+            // Ensure the source and destinations are primitive integer types.
+            let _ = !$x;
+            let _ = $x as u8;
+            0
+        } else if false {
+            // Ensure that the source and destinations are the same size.
+            // SAFETY: This code is under an `if false`.
+            #[allow(unsafe_code, unused_unsafe, clippy::useless_transmute)]
+            unsafe {
+                ::core::mem::transmute($x)
+            }
+        } else {
+            // Do the conversion.
+            $x as _
+        }
+    }};
+}
+
+/// Return a [`bitcast`] of the value of `$x.bits()`, where `$x` is a
+/// `bitflags` type.
+macro_rules! bitflags_bits {
+    ($x:expr) => {{
+        bitcast!($x.bits())
+    }};
+}
diff --git a/vendor/rustix/src/buffer.rs b/vendor/rustix/src/buffer.rs
new file mode 100644
index 0000000..e4b40c7
--- /dev/null
+++ b/vendor/rustix/src/buffer.rs
@@ -0,0 +1,21 @@
+//! Utilities to help with buffering.
+
+#![allow(unsafe_code)]
+
+use core::mem::MaybeUninit;
+use core::slice;
+
+/// Split an uninitialized byte slice into initialized and uninitialized parts.
+///
+/// # Safety
+///
+/// At least `init` bytes must be initialized.
+#[inline]
+pub(super) unsafe fn split_init(
+    buf: &mut [MaybeUninit<u8>],
+    init: usize,
+) -> (&mut [u8], &mut [MaybeUninit<u8>]) {
+    let (init, uninit) = buf.split_at_mut(init);
+    let init = slice::from_raw_parts_mut(init.as_mut_ptr() as *mut u8, init.len());
+    (init, uninit)
+}
diff --git a/vendor/rustix/src/check_types.rs b/vendor/rustix/src/check_types.rs
new file mode 100644
index 0000000..0140b6d
--- /dev/null
+++ b/vendor/rustix/src/check_types.rs
@@ -0,0 +1,91 @@
+//! Macros for checking that types have the same layout as other types.
+
+#![allow(unused_macros)]
+
+/// Check that the size and alignment of a type match the `sys` bindings.
+macro_rules! check_type {
+    ($struct:ident) => {
+        assert_eq_size!($struct, c::$struct);
+        assert_eq_align!($struct, c::$struct);
+    };
+}
+
+/// The same as `check_type`, but for unions and anonymous structs we've
+/// renamed to avoid having types like `bindgen_ty_1` in the API.
+macro_rules! check_renamed_type {
+    ($to:ident, $from:ident) => {
+        assert_eq_size!($to, c::$from);
+        assert_eq_align!($to, c::$from);
+    };
+}
+
+/// Check that the field of a struct has the same offset as the corresponding
+/// field in the `sys` bindings.
+macro_rules! check_struct_field {
+    ($struct:ident, $field:ident) => {
+        const_assert_eq!(
+            memoffset::offset_of!($struct, $field),
+            memoffset::offset_of!(c::$struct, $field)
+        );
+
+        // This can't use `const_assert_eq` because `span_of` returns a
+        // `Range`, which can't be compared in const contexts.
+        assert_eq!(
+            memoffset::span_of!($struct, $field),
+            memoffset::span_of!(c::$struct, $field)
+        );
+    };
+}
+
+/// The same as `check_struct_field`, but for unions and anonymous structs
+/// we've renamed to avoid having types like `bindgen_ty_1` in the API.
+macro_rules! check_struct_renamed_field {
+    ($struct:ident, $to:ident, $from:ident) => {
+        const_assert_eq!(
+            memoffset::offset_of!($struct, $to),
+            memoffset::offset_of!(c::$struct, $from)
+        );
+
+        // As above, this can't use `const_assert_eq`.
+        assert_eq!(
+            memoffset::span_of!($struct, $to),
+            memoffset::span_of!(c::$struct, $from)
+        );
+    };
+}
+
+/// The same as `check_struct_renamed_field`, but for when both the struct and
+/// a field are renamed.
+macro_rules! check_renamed_struct_renamed_field {
+    ($to_struct:ident, $from_struct:ident, $to:ident, $from:ident) => {
+        const_assert_eq!(
+            memoffset::offset_of!($to_struct, $to),
+            memoffset::offset_of!(c::$from_struct, $from)
+        );
+
+        // As above, this can't use `const_assert_eq`.
+        assert_eq!(
+            memoffset::span_of!($to_struct, $to),
+            memoffset::span_of!(c::$from_struct, $from)
+        );
+    };
+}
+
+/// For the common case of no renaming, check all fields of a struct.
+macro_rules! check_struct {
+    ($name:ident, $($field:ident),*) => {
+        // Check the size and alignment.
+        check_type!($name);
+
+        // Check that we have all the fields.
+        if false {
+            #[allow(unreachable_code)]
+            let _test = $name {
+                $($field: panic!()),*
+            };
+        }
+
+        // Check that the fields have the right sizes and offsets.
+        $(check_struct_field!($name, $field));*
+    };
+}
diff --git a/vendor/rustix/src/clockid.rs b/vendor/rustix/src/clockid.rs
new file mode 100644
index 0000000..b392d6a
--- /dev/null
+++ b/vendor/rustix/src/clockid.rs
@@ -0,0 +1,164 @@
+use crate::backend::c;
+use crate::fd::BorrowedFd;
+
+/// `CLOCK_*` constants for use with [`clock_gettime`].
+///
+/// These constants are always supported at runtime, so `clock_gettime` never
+/// has to fail with `INVAL` due to an unsupported clock. See
+/// [`DynamicClockId`] for a greater set of clocks, with the caveat that not
+/// all of them are always supported.
+///
+/// [`clock_gettime`]: crate::time::clock_gettime
+#[cfg(not(any(apple, target_os = "wasi")))]
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+#[cfg_attr(not(any(target_os = "aix", target_os = "dragonfly")), repr(i32))]
+#[cfg_attr(target_os = "dragonfly", repr(u64))]
+#[cfg_attr(target_os = "aix", repr(i64))]
+#[non_exhaustive]
+pub enum ClockId {
+    /// `CLOCK_REALTIME`
+    #[doc(alias = "CLOCK_REALTIME")]
+    Realtime = bitcast!(c::CLOCK_REALTIME),
+
+    /// `CLOCK_MONOTONIC`
+    #[doc(alias = "CLOCK_MONOTONIC")]
+    Monotonic = bitcast!(c::CLOCK_MONOTONIC),
+
+    /// `CLOCK_UPTIME`
+    #[cfg(any(freebsdlike, target_os = "openbsd"))]
+    #[doc(alias = "CLOCK_UPTIME")]
+    Uptime = c::CLOCK_UPTIME,
+
+    /// `CLOCK_PROCESS_CPUTIME_ID`
+    #[cfg(not(any(
+        solarish,
+        target_os = "netbsd",
+        target_os = "redox",
+        target_os = "vita"
+    )))]
+    #[doc(alias = "CLOCK_PROCESS_CPUTIME_ID")]
+    ProcessCPUTime = c::CLOCK_PROCESS_CPUTIME_ID,
+
+    /// `CLOCK_THREAD_CPUTIME_ID`
+    #[cfg(not(any(
+        solarish,
+        target_os = "netbsd",
+        target_os = "redox",
+        target_os = "vita"
+    )))]
+    #[doc(alias = "CLOCK_THREAD_CPUTIME_ID")]
+    ThreadCPUTime = c::CLOCK_THREAD_CPUTIME_ID,
+
+    /// `CLOCK_REALTIME_COARSE`
+    #[cfg(any(linux_kernel, target_os = "freebsd"))]
+    #[doc(alias = "CLOCK_REALTIME_COARSE")]
+    RealtimeCoarse = c::CLOCK_REALTIME_COARSE,
+
+    /// `CLOCK_MONOTONIC_COARSE`
+    #[cfg(any(linux_kernel, target_os = "freebsd"))]
+    #[doc(alias = "CLOCK_MONOTONIC_COARSE")]
+    MonotonicCoarse = c::CLOCK_MONOTONIC_COARSE,
+
+    /// `CLOCK_MONOTONIC_RAW`
+    #[cfg(linux_kernel)]
+    #[doc(alias = "CLOCK_MONOTONIC_RAW")]
+    MonotonicRaw = c::CLOCK_MONOTONIC_RAW,
+
+    /// `CLOCK_REALTIME_ALARM`
+    #[cfg(linux_kernel)]
+    #[doc(alias = "CLOCK_REALTIME_ALARM")]
+    RealtimeAlarm = bitcast!(c::CLOCK_REALTIME_ALARM),
+
+    /// `CLOCK_TAI`, available on Linux >= 3.10
+    #[cfg(all(linux_kernel, feature = "linux_4_11"))]
+    #[doc(alias = "CLOCK_TAI")]
+    Tai = bitcast!(c::CLOCK_TAI),
+
+    /// `CLOCK_BOOTTIME`
+    ///
+    /// On FreeBSD, use [`Self::Uptime`], as `CLOCK_BOOTTIME` is an alias for
+    /// `CLOCK_UPTIME`.
+    ///
+    /// [`Self::Uptime`]: https://docs.rs/rustix/*/x86_64-unknown-freebsd/rustix/time/enum.ClockId.html#variant.Uptime
+    #[cfg(any(linux_kernel, target_os = "fuchsia", target_os = "openbsd"))]
+    #[doc(alias = "CLOCK_BOOTTIME")]
+    Boottime = bitcast!(c::CLOCK_BOOTTIME),
+
+    /// `CLOCK_BOOTTIME_ALARM`
+    #[cfg(any(linux_kernel, target_os = "fuchsia"))]
+    #[doc(alias = "CLOCK_BOOTTIME_ALARM")]
+    BoottimeAlarm = bitcast!(c::CLOCK_BOOTTIME_ALARM),
+}
+
+/// `CLOCK_*` constants for use with [`clock_gettime`].
+///
+/// These constants are always supported at runtime, so `clock_gettime` never
+/// has to fail with `INVAL` due to an unsupported clock. See
+/// [`DynamicClockId`] for a greater set of clocks, with the caveat that not
+/// all of them are always supported.
+///
+/// [`clock_gettime`]: crate::time::clock_gettime
+#[cfg(apple)]
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+#[repr(u32)]
+#[non_exhaustive]
+pub enum ClockId {
+    /// `CLOCK_REALTIME`
+    #[doc(alias = "CLOCK_REALTIME")]
+    Realtime = c::CLOCK_REALTIME,
+
+    /// `CLOCK_MONOTONIC`
+    #[doc(alias = "CLOCK_MONOTONIC")]
+    Monotonic = c::CLOCK_MONOTONIC,
+
+    /// `CLOCK_PROCESS_CPUTIME_ID`
+    #[doc(alias = "CLOCK_PROCESS_CPUTIME_ID")]
+    ProcessCPUTime = c::CLOCK_PROCESS_CPUTIME_ID,
+
+    /// `CLOCK_THREAD_CPUTIME_ID`
+    #[doc(alias = "CLOCK_THREAD_CPUTIME_ID")]
+    ThreadCPUTime = c::CLOCK_THREAD_CPUTIME_ID,
+}
+
+/// `CLOCK_*` constants for use with [`clock_gettime_dynamic`].
+///
+/// These constants may be unsupported at runtime, depending on the OS version,
+/// and `clock_gettime_dynamic` may fail with `INVAL`. See [`ClockId`] for
+/// clocks which are always supported at runtime.
+///
+/// [`clock_gettime_dynamic`]: crate::time::clock_gettime_dynamic
+#[cfg(not(target_os = "wasi"))]
+#[derive(Debug, Copy, Clone)]
+#[non_exhaustive]
+pub enum DynamicClockId<'a> {
+    /// `ClockId` values that are always supported at runtime.
+    Known(ClockId),
+
+    /// Linux dynamic clocks.
+    Dynamic(BorrowedFd<'a>),
+
+    /// `CLOCK_REALTIME_ALARM`
+    #[cfg(linux_kernel)]
+    #[doc(alias = "CLOCK_REALTIME_ALARM")]
+    RealtimeAlarm,
+
+    /// `CLOCK_TAI`, available on Linux >= 3.10
+    #[cfg(linux_kernel)]
+    #[doc(alias = "CLOCK_TAI")]
+    Tai,
+
+    /// `CLOCK_BOOTTIME`
+    #[cfg(any(
+        freebsdlike,
+        linux_kernel,
+        target_os = "fuchsia",
+        target_os = "openbsd"
+    ))]
+    #[doc(alias = "CLOCK_BOOTTIME")]
+    Boottime,
+
+    /// `CLOCK_BOOTTIME_ALARM`
+    #[cfg(any(linux_kernel, target_os = "fuchsia"))]
+    #[doc(alias = "CLOCK_BOOTTIME_ALARM")]
+    BoottimeAlarm,
+}
diff --git a/vendor/rustix/src/cstr.rs b/vendor/rustix/src/cstr.rs
new file mode 100644
index 0000000..17a8c8b
--- /dev/null
+++ b/vendor/rustix/src/cstr.rs
@@ -0,0 +1,77 @@
+/// A macro for [`CStr`] literals.
+///
+/// This can make passing string literals to rustix APIs more efficient, since
+/// most underlying system calls with string arguments expect NUL-terminated
+/// strings, and passing strings to rustix as `CStr`s means that rustix doesn't
+/// need to copy them into a separate buffer to NUL-terminate them.
+///
+/// [`CStr`]: crate::ffi::CStr
+///
+/// # Examples
+///
+/// ```
+/// # #[cfg(feature = "fs")]
+/// # fn main() -> rustix::io::Result<()> {
+/// use rustix::cstr;
+/// use rustix::fs::{statat, AtFlags, CWD};
+///
+/// let metadata = statat(CWD, cstr!("Cargo.toml"), AtFlags::empty())?;
+/// # Ok(())
+/// # }
+/// # #[cfg(not(feature = "fs"))]
+/// # fn main() {}
+/// ```
+#[allow(unused_macros)]
+#[macro_export]
+macro_rules! cstr {
+    ($str:literal) => {{
+        // Check for NUL manually, to ensure safety.
+        //
+        // In release builds, with strings that don't contain NULs, this
+        // constant-folds away.
+        //
+        // We don't use std's `CStr::from_bytes_with_nul`; as of this writing,
+        // that function isn't defined as `#[inline]` in std and doesn't
+        // constant-fold away.
+        assert!(
+            !$str.bytes().any(|b| b == b'\0'),
+            "cstr argument contains embedded NUL bytes",
+        );
+
+        #[allow(unsafe_code, unused_unsafe)]
+        {
+            // Now that we know the string doesn't have embedded NULs, we can
+            // call `from_bytes_with_nul_unchecked`, which as of this writing
+            // is defined as `#[inline]` and completely optimizes away.
+            //
+            // SAFETY: We have manually checked that the string does not
+            // contain embedded NULs above, and we append or own NUL terminator
+            // here.
+            unsafe {
+                $crate::ffi::CStr::from_bytes_with_nul_unchecked(concat!($str, "\0").as_bytes())
+            }
+        }
+    }};
+}
+
+#[test]
+fn test_cstr() {
+    use crate::ffi::CString;
+    use alloc::borrow::ToOwned;
+    assert_eq!(cstr!(""), &*CString::new("").unwrap());
+    assert_eq!(cstr!("").to_owned(), CString::new("").unwrap());
+    assert_eq!(cstr!("hello"), &*CString::new("hello").unwrap());
+    assert_eq!(cstr!("hello").to_owned(), CString::new("hello").unwrap());
+}
+
+#[test]
+#[should_panic]
+fn test_invalid_cstr() {
+    let _ = cstr!("hello\0world");
+}
+
+#[test]
+#[should_panic]
+fn test_invalid_empty_cstr() {
+    let _ = cstr!("\0");
+}
diff --git a/vendor/rustix/src/event/eventfd.rs b/vendor/rustix/src/event/eventfd.rs
new file mode 100644
index 0000000..a76f2cf
--- /dev/null
+++ b/vendor/rustix/src/event/eventfd.rs
@@ -0,0 +1,20 @@
+use crate::fd::OwnedFd;
+use crate::{backend, io};
+
+pub use backend::event::types::EventfdFlags;
+
+/// `eventfd(initval, flags)`—Creates a file descriptor for event
+/// notification.
+///
+/// # References
+///  - [Linux]
+///  - [FreeBSD]
+///  - [illumos]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/eventfd.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?eventfd
+/// [illumos]: https://illumos.org/man/3C/eventfd
+#[inline]
+pub fn eventfd(initval: u32, flags: EventfdFlags) -> io::Result<OwnedFd> {
+    backend::event::syscalls::eventfd(initval, flags)
+}
diff --git a/vendor/rustix/src/event/kqueue.rs b/vendor/rustix/src/event/kqueue.rs
new file mode 100644
index 0000000..d6b7cde
--- /dev/null
+++ b/vendor/rustix/src/event/kqueue.rs
@@ -0,0 +1,449 @@
+//! An API for interfacing with `kqueue`.
+
+use crate::fd::{AsFd, OwnedFd, RawFd};
+use crate::pid::Pid;
+use crate::signal::Signal;
+use crate::{backend, io};
+
+use backend::c::{self, intptr_t, kevent as kevent_t, uintptr_t};
+use backend::event::syscalls;
+
+use alloc::vec::Vec;
+use core::mem::zeroed;
+use core::ptr::slice_from_raw_parts_mut;
+use core::time::Duration;
+
+/// A `kqueue` event for use with [`kevent`].
+#[repr(transparent)]
+#[derive(Copy, Clone)]
+pub struct Event {
+    // The layout varies between BSDs and macOS.
+    inner: kevent_t,
+}
+
+impl Event {
+    /// Create a new `Event`.
+    #[allow(clippy::needless_update)]
+    pub fn new(filter: EventFilter, flags: EventFlags, udata: isize) -> Event {
+        let (ident, data, filter, fflags) = match filter {
+            EventFilter::Read(fd) => (fd as uintptr_t, 0, c::EVFILT_READ, 0),
+            EventFilter::Write(fd) => (fd as _, 0, c::EVFILT_WRITE, 0),
+            #[cfg(target_os = "freebsd")]
+            EventFilter::Empty(fd) => (fd as _, 0, c::EVFILT_EMPTY, 0),
+            EventFilter::Vnode { vnode, flags } => (vnode as _, 0, c::EVFILT_VNODE, flags.bits()),
+            EventFilter::Proc { pid, flags } => {
+                (Pid::as_raw(Some(pid)) as _, 0, c::EVFILT_PROC, flags.bits())
+            }
+            EventFilter::Signal { signal, times: _ } => (signal as _, 0, c::EVFILT_SIGNAL, 0),
+            EventFilter::Timer { ident, timer } => {
+                #[cfg(any(apple, target_os = "freebsd", target_os = "netbsd"))]
+                let (data, fflags) = match timer {
+                    Some(timer) => {
+                        if timer.subsec_millis() == 0 {
+                            (timer.as_secs() as _, c::NOTE_SECONDS)
+                        } else if timer.subsec_nanos() == 0 {
+                            (timer.as_micros() as _, c::NOTE_USECONDS)
+                        } else {
+                            (timer.as_nanos() as _, c::NOTE_NSECONDS)
+                        }
+                    }
+                    None => (intptr_t::MAX, c::NOTE_SECONDS),
+                };
+                #[cfg(any(target_os = "dragonfly", target_os = "openbsd"))]
+                let (data, fflags) = match timer {
+                    Some(timer) => (timer.as_millis() as _, 0),
+                    None => (intptr_t::MAX, 0),
+                };
+
+                (ident as _, data, c::EVFILT_TIMER, fflags)
+            }
+            #[cfg(any(apple, freebsdlike))]
+            EventFilter::User {
+                ident,
+                flags,
+                user_flags,
+            } => (ident as _, 0, c::EVFILT_USER, flags.bits() | user_flags.0),
+            EventFilter::Unknown => panic!("unknown filter"),
+        };
+
+        Event {
+            inner: kevent_t {
+                ident,
+                filter: filter as _,
+                flags: flags.bits() as _,
+                fflags,
+                data: {
+                    // On OpenBSD, data is an `i64` and not an `isize`.
+                    data as _
+                },
+                udata: {
+                    // On NetBSD, udata is an `isize` and not a pointer.
+                    // TODO: Strict provenance, prevent int-to-ptr cast.
+                    udata as _
+                },
+                ..unsafe { zeroed() }
+            },
+        }
+    }
+
+    /// Get the event flags for this event.
+    pub fn flags(&self) -> EventFlags {
+        EventFlags::from_bits_retain(self.inner.flags as _)
+    }
+
+    /// Get the user data for this event.
+    pub fn udata(&self) -> isize {
+        // On NetBSD, udata is an isize and not a pointer.
+        // TODO: Strict provenance, prevent ptr-to-int cast.
+
+        self.inner.udata as _
+    }
+
+    /// Get the raw data for this event.
+    pub fn data(&self) -> i64 {
+        // On some BSDs, data is an `isize` and not an `i64`.
+        self.inner.data as _
+    }
+
+    /// Get the filter of this event.
+    pub fn filter(&self) -> EventFilter {
+        match self.inner.filter as _ {
+            c::EVFILT_READ => EventFilter::Read(self.inner.ident as _),
+            c::EVFILT_WRITE => EventFilter::Write(self.inner.ident as _),
+            #[cfg(target_os = "freebsd")]
+            c::EVFILT_EMPTY => EventFilter::Empty(self.inner.ident as _),
+            c::EVFILT_VNODE => EventFilter::Vnode {
+                vnode: self.inner.ident as _,
+                flags: VnodeEvents::from_bits_retain(self.inner.fflags),
+            },
+            c::EVFILT_PROC => EventFilter::Proc {
+                pid: Pid::from_raw(self.inner.ident as _).unwrap(),
+                flags: ProcessEvents::from_bits_retain(self.inner.fflags),
+            },
+            c::EVFILT_SIGNAL => EventFilter::Signal {
+                signal: Signal::from_raw(self.inner.ident as _).unwrap(),
+                times: self.inner.data as _,
+            },
+            c::EVFILT_TIMER => EventFilter::Timer {
+                ident: self.inner.ident as _,
+                timer: {
+                    let (data, fflags) = (self.inner.data, self.inner.fflags);
+                    #[cfg(not(any(apple, target_os = "freebsd", target_os = "netbsd")))]
+                    let _ = fflags;
+                    #[cfg(any(apple, target_os = "freebsd", target_os = "netbsd"))]
+                    match fflags as _ {
+                        c::NOTE_SECONDS => Some(Duration::from_secs(data as _)),
+                        c::NOTE_USECONDS => Some(Duration::from_micros(data as _)),
+                        c::NOTE_NSECONDS => Some(Duration::from_nanos(data as _)),
+                        _ => {
+                            // Unknown timer flags.
+                            None
+                        }
+                    }
+                    #[cfg(any(target_os = "dragonfly", target_os = "openbsd"))]
+                    Some(Duration::from_millis(data as _))
+                },
+            },
+            #[cfg(any(apple, freebsdlike))]
+            c::EVFILT_USER => EventFilter::User {
+                ident: self.inner.ident as _,
+                flags: UserFlags::from_bits_retain(self.inner.fflags),
+                user_flags: UserDefinedFlags(self.inner.fflags & EVFILT_USER_FLAGS),
+            },
+            _ => EventFilter::Unknown,
+        }
+    }
+}
+
+/// Bottom 24 bits of a u32.
+#[cfg(any(apple, freebsdlike))]
+const EVFILT_USER_FLAGS: u32 = 0x00ff_ffff;
+
+/// The possible filters for a `kqueue`.
+#[repr(i16)]
+#[non_exhaustive]
+pub enum EventFilter {
+    /// A read filter.
+    Read(RawFd),
+
+    /// A write filter.
+    Write(RawFd),
+
+    /// An empty filter.
+    #[cfg(target_os = "freebsd")]
+    Empty(RawFd),
+
+    /// A VNode filter.
+    Vnode {
+        /// The file descriptor we looked for events in.
+        vnode: RawFd,
+
+        /// The flags for this event.
+        flags: VnodeEvents,
+    },
+
+    /// A process filter.
+    Proc {
+        /// The process ID we waited on.
+        pid: Pid,
+
+        /// The flags for this event.
+        flags: ProcessEvents,
+    },
+
+    /// A signal filter.
+    Signal {
+        /// The signal number we waited on.
+        signal: Signal,
+
+        /// The number of times the signal has been
+        /// received since the last call to kevent.
+        times: usize,
+    },
+
+    /// A timer filter.
+    Timer {
+        /// The identifier for this event.
+        ident: intptr_t,
+
+        /// The duration for this event.
+        timer: Option<Duration>,
+    },
+
+    /// A user filter.
+    #[cfg(any(apple, freebsdlike))]
+    User {
+        /// The identifier for this event.
+        ident: intptr_t,
+
+        /// The flags for this event.
+        flags: UserFlags,
+
+        /// The user-defined flags for this event.
+        user_flags: UserDefinedFlags,
+    },
+
+    /// This filter is unknown.
+    ///
+    /// # Panics
+    ///
+    /// Passing this into `Event::new()` will result in a panic.
+    Unknown,
+}
+
+bitflags::bitflags! {
+    /// The flags for a `kqueue` event specifying actions to perform.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct EventFlags: u16 {
+        /// Add the event to the `kqueue`.
+        const ADD = c::EV_ADD as _;
+
+        /// Enable the event.
+        const ENABLE = c::EV_ENABLE as _;
+
+        /// Disable the event.
+        const DISABLE = c::EV_DISABLE as _;
+
+        /// Delete the event from the `kqueue`.
+        const DELETE = c::EV_DELETE as _;
+
+        /// TODO
+        const RECEIPT = c::EV_RECEIPT as _;
+
+        /// Clear the event after it is triggered.
+        const ONESHOT = c::EV_ONESHOT as _;
+
+        /// TODO
+        const CLEAR = c::EV_CLEAR as _;
+
+        /// TODO
+        const EOF = c::EV_EOF as _;
+
+        /// TODO
+        const ERROR = c::EV_ERROR as _;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// The flags for a virtual node event.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct VnodeEvents: u32 {
+        /// The file was deleted.
+        const DELETE = c::NOTE_DELETE;
+
+        /// The file was written to.
+        const WRITE = c::NOTE_WRITE;
+
+        /// The file was extended.
+        const EXTEND = c::NOTE_EXTEND;
+
+        /// The file had its attributes changed.
+        const ATTRIBUTES = c::NOTE_ATTRIB;
+
+        /// The file was renamed.
+        const RENAME = c::NOTE_RENAME;
+
+        /// Access to the file was revoked.
+        const REVOKE = c::NOTE_REVOKE;
+
+        /// The link count of the file has changed.
+        const LINK = c::NOTE_LINK;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// The flags for a process event.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct ProcessEvents: u32 {
+        /// The process exited.
+        const EXIT = c::NOTE_EXIT;
+
+        /// The process forked itself.
+        const FORK = c::NOTE_FORK;
+
+        /// The process executed a new process.
+        const EXEC = c::NOTE_EXEC;
+
+        /// Follow the process through `fork` calls (write only).
+        const TRACK = c::NOTE_TRACK;
+
+        /// An error has occurred with following the process.
+        const TRACKERR = c::NOTE_TRACKERR;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(any(apple, freebsdlike))]
+bitflags::bitflags! {
+    /// The flags for a user event.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct UserFlags: u32 {
+        /// Ignore the user input flags.
+        const NOINPUT = c::NOTE_FFNOP;
+
+        /// Bitwise AND `fflags`.
+        const AND = c::NOTE_FFAND;
+
+        /// Bitwise OR `fflags`.
+        const OR = c::NOTE_FFOR;
+
+        /// Copy `fflags`.
+        const COPY = c::NOTE_FFCOPY;
+
+        /// Control mask for operations.
+        const CTRLMASK = c::NOTE_FFCTRLMASK;
+
+        /// User defined flags for masks.
+        const UDFMASK = c::NOTE_FFLAGSMASK;
+
+        /// Trigger the event.
+        const TRIGGER = c::NOTE_TRIGGER;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// User-defined flags.
+///
+/// Only the lower 24 bits are used in this struct.
+#[repr(transparent)]
+#[cfg(any(apple, freebsdlike))]
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub struct UserDefinedFlags(u32);
+
+#[cfg(any(apple, freebsdlike))]
+impl UserDefinedFlags {
+    /// Create a new `UserDefinedFlags` from a `u32`.
+    pub fn new(flags: u32) -> Self {
+        Self(flags & EVFILT_USER_FLAGS)
+    }
+
+    /// Get the underlying `u32`.
+    pub fn get(self) -> u32 {
+        self.0
+    }
+}
+
+/// `kqueue()`—Create a new `kqueue` file descriptor.
+///
+/// # References
+///  - [Apple]
+///  - [FreeBSD]
+///  - [OpenBSD]
+///  - [NetBSD]
+///  - [DragonFly BSD]
+///
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/kqueue.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=kqueue&sektion=2
+/// [OpenBSD]: https://man.openbsd.org/kqueue.2
+/// [NetBSD]: https://man.netbsd.org/kqueue.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=kqueue&section=2
+pub fn kqueue() -> io::Result<OwnedFd> {
+    syscalls::kqueue()
+}
+
+/// `kevent(kqueue, changelist, eventlist, timeout)`—Wait for events on a
+/// `kqueue`.
+///
+/// Note: in order to receive events, make sure to allocate capacity in the
+/// eventlist! Otherwise, the function will return immediately.
+///
+/// # Safety
+///
+/// The file descriptors referred to by the `Event` structs must be valid for
+/// the lifetime of the `kqueue` file descriptor.
+///
+/// # References
+///  - [Apple]
+///  - [FreeBSD]
+///  - [OpenBSD]
+///  - [NetBSD]
+///  - [DragonFly BSD]
+///
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/kevent.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=kevent&sektion=2
+/// [OpenBSD]: https://man.openbsd.org/kevent.2
+/// [NetBSD]: https://man.netbsd.org/kevent.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=kevent&section=2
+pub unsafe fn kevent(
+    kqueue: impl AsFd,
+    changelist: &[Event],
+    eventlist: &mut Vec<Event>,
+    timeout: Option<Duration>,
+) -> io::Result<usize> {
+    let timeout = timeout.map(|timeout| backend::c::timespec {
+        tv_sec: timeout.as_secs() as _,
+        tv_nsec: timeout.subsec_nanos() as _,
+    });
+
+    // Populate the event list with events.
+    eventlist.set_len(0);
+    let out_slice = slice_from_raw_parts_mut(eventlist.as_mut_ptr().cast(), eventlist.capacity());
+    let res = syscalls::kevent(
+        kqueue.as_fd(),
+        changelist,
+        &mut *out_slice,
+        timeout.as_ref(),
+    )
+    .map(|res| res as _);
+
+    // Update the event list.
+    if let Ok(len) = res {
+        eventlist.set_len(len);
+    }
+
+    res
+}
diff --git a/vendor/rustix/src/event/mod.rs b/vendor/rustix/src/event/mod.rs
new file mode 100644
index 0000000..b6b7f99
--- /dev/null
+++ b/vendor/rustix/src/event/mod.rs
@@ -0,0 +1,29 @@
+//! Event operations.
+
+#[cfg(any(
+    linux_kernel,
+    target_os = "freebsd",
+    target_os = "illumos",
+    target_os = "espidf"
+))]
+mod eventfd;
+#[cfg(all(feature = "alloc", bsd))]
+pub mod kqueue;
+#[cfg(not(any(windows, target_os = "redox", target_os = "wasi")))]
+mod pause;
+mod poll;
+#[cfg(solarish)]
+pub mod port;
+
+#[cfg(linux_kernel)]
+pub use crate::backend::event::epoll;
+#[cfg(any(
+    linux_kernel,
+    target_os = "freebsd",
+    target_os = "illumos",
+    target_os = "espidf"
+))]
+pub use eventfd::{eventfd, EventfdFlags};
+#[cfg(not(any(windows, target_os = "redox", target_os = "wasi")))]
+pub use pause::*;
+pub use poll::{poll, PollFd, PollFlags};
diff --git a/vendor/rustix/src/event/pause.rs b/vendor/rustix/src/event/pause.rs
new file mode 100644
index 0000000..f191084
--- /dev/null
+++ b/vendor/rustix/src/event/pause.rs
@@ -0,0 +1,31 @@
+use crate::backend;
+
+/// `pause()`
+///
+/// The POSIX `pause` interface returns an error code, but the only thing
+/// `pause` does is sleep until interrupted by a signal, so it always
+/// returns the same thing with the same error code, so in rustix, the
+/// return value is omitted.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/pause.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/pause.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/pause.3.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=pause&sektion=3
+/// [NetBSD]: https://man.netbsd.org/pause.3
+/// [OpenBSD]: https://man.openbsd.org/pause.3
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=pause&section=3
+/// [illumos]: https://illumos.org/man/2/pause
+#[inline]
+pub fn pause() {
+    backend::event::syscalls::pause()
+}
diff --git a/vendor/rustix/src/event/poll.rs b/vendor/rustix/src/event/poll.rs
new file mode 100644
index 0000000..30e6a4b
--- /dev/null
+++ b/vendor/rustix/src/event/poll.rs
@@ -0,0 +1,32 @@
+use crate::{backend, io};
+
+pub use backend::event::poll_fd::{PollFd, PollFlags};
+
+/// `poll(self.fds, timeout)`
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/slightly-advanced-techniques.html#poll
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/poll.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/poll.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/poll.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-wsapoll
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=poll&sektion=2
+/// [NetBSD]: https://man.netbsd.org/poll.2
+/// [OpenBSD]: https://man.openbsd.org/poll.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=poll&section=2
+/// [illumos]: https://illumos.org/man/2/poll
+#[inline]
+pub fn poll(fds: &mut [PollFd<'_>], timeout: i32) -> io::Result<usize> {
+    backend::event::syscalls::poll(fds, timeout)
+}
diff --git a/vendor/rustix/src/event/port.rs b/vendor/rustix/src/event/port.rs
new file mode 100644
index 0000000..39fe5ac
--- /dev/null
+++ b/vendor/rustix/src/event/port.rs
@@ -0,0 +1,151 @@
+//! Solaris/illumos event ports.
+
+use crate::backend::c;
+use crate::backend::event::syscalls;
+use crate::fd::{AsFd, AsRawFd, OwnedFd};
+use crate::io;
+
+use super::PollFlags;
+
+use core::time::Duration;
+
+/// The structure representing a port event.
+#[repr(transparent)]
+pub struct Event(pub(crate) c::port_event);
+
+impl Event {
+    /// Get the events associated with this event.
+    pub fn events(&self) -> i32 {
+        self.0.portev_events
+    }
+
+    /// Get the event source associated with this event.
+    pub fn object(&self) -> usize {
+        self.0.portev_object
+    }
+
+    /// Get the userdata associated with this event.
+    pub fn userdata(&self) -> *mut c::c_void {
+        self.0.portev_user
+    }
+}
+
+/// `port_create()`—Creates a new port.
+///
+/// # References
+///  - [OpenSolaris]
+///  - [illumos]
+///
+/// [OpenSolaris]: https://www.unix.com/man-page/opensolaris/3C/port_create/
+/// [illumos]: https://illumos.org/man/3C/port_create
+pub fn port_create() -> io::Result<OwnedFd> {
+    syscalls::port_create()
+}
+
+/// `port_associate(_, PORT_SOURCE_FD, _, _, _)`—Associates a file descriptor
+/// with a port.
+///
+/// # Safety
+///
+/// Any `object`s passed into the `port` must be valid for the lifetime of the
+/// `port`. Logically, `port` keeps a borrowed reference to the `object` until
+/// it is removed via `port_dissociate_fd`.
+///
+/// # References
+///  - [OpenSolaris]
+///  - [illumos]
+///
+/// [OpenSolaris]: https://www.unix.com/man-page/opensolaris/3C/port_associate/
+/// [illumos]: https://illumos.org/man/3C/port_associate
+pub unsafe fn port_associate_fd(
+    port: impl AsFd,
+    object: impl AsRawFd,
+    events: PollFlags,
+    userdata: *mut c::c_void,
+) -> io::Result<()> {
+    syscalls::port_associate(
+        port.as_fd(),
+        c::PORT_SOURCE_FD,
+        object.as_raw_fd() as _,
+        events.bits() as _,
+        userdata.cast(),
+    )
+}
+
+/// `port_dissociate(_, PORT_SOURCE_FD, _)`—Dissociates a file descriptor
+/// from a port.
+///
+/// # Safety
+///
+/// The file descriptor passed into this function must have been previously
+/// associated with the port via [`port_associate_fd`].
+///
+/// # References
+///  - [OpenSolaris]
+///  - [illumos]
+///
+/// [OpenSolaris]: https://www.unix.com/man-page/opensolaris/3C/port_dissociate
+/// [illumos]: https://illumos.org/man/3C/port_dissociate
+pub unsafe fn port_dissociate_fd(port: impl AsFd, object: impl AsRawFd) -> io::Result<()> {
+    syscalls::port_dissociate(port.as_fd(), c::PORT_SOURCE_FD, object.as_raw_fd() as _)
+}
+
+/// `port_get(port, timeout)`—Gets an event from a port.
+///
+/// # References
+///  - [OpenSolaris]
+///  - [illumos]
+///
+/// [OpenSolaris]: https://www.unix.com/man-page/opensolaris/3C/port_get/
+/// [illumos]: https://illumos.org/man/3C/port_get
+pub fn port_get(port: impl AsFd, timeout: Option<Duration>) -> io::Result<Event> {
+    let mut timeout = timeout.map(|timeout| c::timespec {
+        tv_sec: timeout.as_secs().try_into().unwrap(),
+        tv_nsec: timeout.subsec_nanos() as _,
+    });
+
+    syscalls::port_get(port.as_fd(), timeout.as_mut())
+}
+
+/// `port_getn(port, events, min_events, timeout)`—Gets multiple events from a
+/// port.
+///
+/// # References
+///  - [OpenSolaris]
+///  - [illumos]
+///
+/// [OpenSolaris]: https://www.unix.com/man-page/opensolaris/3C/port_getn/
+/// [illumos]: https://illumos.org/man/3C/port_getn
+#[cfg(feature = "alloc")]
+pub fn port_getn(
+    port: impl AsFd,
+    events: &mut Vec<Event>,
+    min_events: usize,
+    timeout: Option<Duration>,
+) -> io::Result<()> {
+    events.clear();
+
+    let mut timeout = timeout.map(|timeout| c::timespec {
+        tv_sec: timeout.as_secs().try_into().unwrap(),
+        tv_nsec: timeout.subsec_nanos() as _,
+    });
+
+    syscalls::port_getn(
+        port.as_fd(),
+        timeout.as_mut(),
+        events,
+        min_events.try_into().unwrap(),
+    )
+}
+
+/// `port_send(port, events, userdata)`—Sends an event to a port.
+///
+/// # References
+///  - [OpenSolaris]
+///  - [illumos]
+///
+/// [OpenSolaris]: https://www.unix.com/man-page/opensolaris/3C/port_send/
+/// [illumos]: https://illumos.org/man/3C/port_send
+pub fn port_send(port: impl AsFd, events: i32, userdata: *mut c::c_void) -> io::Result<()> {
+    syscalls::port_send(port.as_fd(), events, userdata.cast())
+}
diff --git a/vendor/rustix/src/ffi.rs b/vendor/rustix/src/ffi.rs
new file mode 100644
index 0000000..ef9f87d
--- /dev/null
+++ b/vendor/rustix/src/ffi.rs
@@ -0,0 +1,15 @@
+//! Utilities related to FFI bindings.
+
+// If we have std, use it.
+#[cfg(feature = "std")]
+pub use {
+    std::ffi::{CStr, CString, FromBytesWithNulError, NulError},
+    std::os::raw::c_char,
+};
+
+// If we don't have std, we can depend on core and alloc having these features
+// in Rust 1.64+.
+#[cfg(all(feature = "alloc", not(feature = "std")))]
+pub use alloc::ffi::{CString, NulError};
+#[cfg(not(feature = "std"))]
+pub use core::ffi::{c_char, CStr, FromBytesWithNulError};
diff --git a/vendor/rustix/src/fs/abs.rs b/vendor/rustix/src/fs/abs.rs
new file mode 100644
index 0000000..fb6c8c3
--- /dev/null
+++ b/vendor/rustix/src/fs/abs.rs
@@ -0,0 +1,301 @@
+//! POSIX-style filesystem functions which operate on bare paths.
+
+use crate::fd::OwnedFd;
+#[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+use crate::fs::Access;
+#[cfg(not(any(
+    solarish,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "netbsd",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+use crate::fs::StatFs;
+#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+use crate::fs::StatVfs;
+use crate::fs::{Mode, OFlags, Stat};
+#[cfg(not(target_os = "wasi"))]
+use crate::ugid::{Gid, Uid};
+use crate::{backend, io, path};
+#[cfg(feature = "alloc")]
+use {
+    crate::ffi::{CStr, CString},
+    crate::path::SMALL_PATH_BUFFER_SIZE,
+    alloc::vec::Vec,
+};
+
+/// `open(path, oflags, mode)`—Opens a file.
+///
+/// POSIX guarantees that `open` will use the lowest unused file descriptor,
+/// however it is not safe in general to rely on this, as file descriptors may
+/// be unexpectedly allocated on other threads or in libraries.
+///
+/// The `Mode` argument is only significant when creating a file.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/open.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/open.2.html
+#[inline]
+pub fn open<P: path::Arg>(path: P, flags: OFlags, mode: Mode) -> io::Result<OwnedFd> {
+    path.into_with_c_str(|path| backend::fs::syscalls::open(path, flags, mode))
+}
+
+/// `chmod(path, mode)`—Sets file or directory permissions.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/chmod.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/chmod.2.html
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub fn chmod<P: path::Arg>(path: P, mode: Mode) -> io::Result<()> {
+    path.into_with_c_str(|path| backend::fs::syscalls::chmod(path, mode))
+}
+
+/// `stat(path)`—Queries metadata for a file or directory.
+///
+/// [`Mode::from_raw_mode`] and [`FileType::from_raw_mode`] may be used to
+/// interpret the `st_mode` field.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/stat.2.html
+/// [`Mode::from_raw_mode`]: crate::fs::Mode::from_raw_mode
+/// [`FileType::from_raw_mode`]: crate::fs::FileType::from_raw_mode
+#[inline]
+pub fn stat<P: path::Arg>(path: P) -> io::Result<Stat> {
+    path.into_with_c_str(backend::fs::syscalls::stat)
+}
+
+/// `lstat(path)`—Queries metadata for a file or directory, without following
+/// symlinks.
+///
+/// [`Mode::from_raw_mode`] and [`FileType::from_raw_mode`] may be used to
+/// interpret the `st_mode` field.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/lstat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/lstat.2.html
+/// [`Mode::from_raw_mode`]: crate::fs::Mode::from_raw_mode
+/// [`FileType::from_raw_mode`]: crate::fs::FileType::from_raw_mode
+#[inline]
+pub fn lstat<P: path::Arg>(path: P) -> io::Result<Stat> {
+    path.into_with_c_str(backend::fs::syscalls::lstat)
+}
+
+/// `readlink(path)`—Reads the contents of a symlink.
+///
+/// If `reuse` is non-empty, reuse its buffer to store the result if possible.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/readlink.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/readlink.2.html
+#[cfg(feature = "alloc")]
+#[inline]
+pub fn readlink<P: path::Arg, B: Into<Vec<u8>>>(path: P, reuse: B) -> io::Result<CString> {
+    path.into_with_c_str(|path| _readlink(path, reuse.into()))
+}
+
+#[cfg(feature = "alloc")]
+fn _readlink(path: &CStr, mut buffer: Vec<u8>) -> io::Result<CString> {
+    // This code would benefit from having a better way to read into
+    // uninitialized memory, but that requires `unsafe`.
+    buffer.clear();
+    buffer.reserve(SMALL_PATH_BUFFER_SIZE);
+    buffer.resize(buffer.capacity(), 0_u8);
+
+    loop {
+        let nread = backend::fs::syscalls::readlink(path, &mut buffer)?;
+
+        let nread = nread as usize;
+        assert!(nread <= buffer.len());
+        if nread < buffer.len() {
+            buffer.resize(nread, 0_u8);
+            return Ok(CString::new(buffer).unwrap());
+        }
+        // Use `Vec` reallocation strategy to grow capacity exponentially.
+        buffer.reserve(1);
+        buffer.resize(buffer.capacity(), 0_u8);
+    }
+}
+
+/// `rename(old_path, new_path)`—Renames a file or directory.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/rename.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/rename.2.html
+#[inline]
+pub fn rename<P: path::Arg, Q: path::Arg>(old_path: P, new_path: Q) -> io::Result<()> {
+    old_path.into_with_c_str(|old_path| {
+        new_path.into_with_c_str(|new_path| backend::fs::syscalls::rename(old_path, new_path))
+    })
+}
+
+/// `unlink(path)`—Unlinks a file.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/unlink.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/unlink.2.html
+#[inline]
+pub fn unlink<P: path::Arg>(path: P) -> io::Result<()> {
+    path.into_with_c_str(backend::fs::syscalls::unlink)
+}
+
+/// `rmdir(path)`—Removes a directory.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/rmdir.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/rmdir.2.html
+#[inline]
+pub fn rmdir<P: path::Arg>(path: P) -> io::Result<()> {
+    path.into_with_c_str(backend::fs::syscalls::rmdir)
+}
+
+/// `link(old_path, new_path)`—Creates a hard link.
+///
+/// POSIX leaves it implementation-defined whether `link` follows a symlink in
+/// `old_path`, or creates a new link to the symbolic link itself. On platforms
+/// which have it, [`linkat`] avoids this problem since it has an [`AtFlags`]
+/// paramter and the [`AtFlags::SYMLINK_FOLLOW`] flag determines whether
+/// symlinks should be followed.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/link.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/link.2.html
+/// [`linkat`]: crate::fs::linkat
+/// [`AtFlags`]: crate::fs::AtFlags
+/// [`AtFlags::SYMLINK_FOLLOW`]: crate::fs::AtFlags::SYMLINK_FOLLOW
+#[inline]
+pub fn link<P: path::Arg, Q: path::Arg>(old_path: P, new_path: Q) -> io::Result<()> {
+    old_path.into_with_c_str(|old_path| {
+        new_path.into_with_c_str(|new_path| backend::fs::syscalls::link(old_path, new_path))
+    })
+}
+
+/// `symlink(old_path, new_path)`—Creates a symlink.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/symlink.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/symlink.2.html
+#[inline]
+pub fn symlink<P: path::Arg, Q: path::Arg>(old_path: P, new_path: Q) -> io::Result<()> {
+    old_path.into_with_c_str(|old_path| {
+        new_path.into_with_c_str(|new_path| backend::fs::syscalls::symlink(old_path, new_path))
+    })
+}
+
+/// `mkdir(path, mode)`—Creates a directory.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/mkdir.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/mkdir.2.html
+#[inline]
+pub fn mkdir<P: path::Arg>(path: P, mode: Mode) -> io::Result<()> {
+    path.into_with_c_str(|path| backend::fs::syscalls::mkdir(path, mode))
+}
+
+/// `access(path, access)`—Tests permissions for a file or directory.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/access.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/access.2.html
+#[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+#[inline]
+pub fn access<P: path::Arg>(path: P, access: Access) -> io::Result<()> {
+    path.into_with_c_str(|path| backend::fs::syscalls::access(path, access))
+}
+
+/// `statfs`—Queries filesystem metadata.
+///
+/// Compared to [`statvfs`], this function often provides more information,
+/// though it's less portable.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/statfs.2.html
+#[cfg(not(any(
+    solarish,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "netbsd",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+#[inline]
+pub fn statfs<P: path::Arg>(path: P) -> io::Result<StatFs> {
+    path.into_with_c_str(backend::fs::syscalls::statfs)
+}
+
+/// `statvfs`—Queries filesystem metadata, POSIX version.
+///
+/// Compared to [`statfs`], this function often provides less information, but
+/// it is more portable. But even so, filesystems are very diverse and not all
+/// the fields are meaningful for every filesystem. And `f_fsid` doesn't seem
+/// to have a clear meaning anywhere.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/statvfs.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/statvfs.2.html
+#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+#[inline]
+pub fn statvfs<P: path::Arg>(path: P) -> io::Result<StatVfs> {
+    path.into_with_c_str(backend::fs::syscalls::statvfs)
+}
+
+/// `chown(path, owner, group)`—Sets open file or directory ownership.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/chown.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/chown.2.html
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub fn chown<P: path::Arg>(path: P, owner: Option<Uid>, group: Option<Gid>) -> io::Result<()> {
+    path.into_with_c_str(|path| backend::fs::syscalls::chown(path, owner, group))
+}
diff --git a/vendor/rustix/src/fs/at.rs b/vendor/rustix/src/fs/at.rs
new file mode 100644
index 0000000..4163692
--- /dev/null
+++ b/vendor/rustix/src/fs/at.rs
@@ -0,0 +1,472 @@
+//! POSIX-style `*at` functions.
+//!
+//! The `dirfd` argument to these functions may be a file descriptor for a
+//! directory, or the special value [`CWD`].
+//!
+//! [`cwd`]: crate::fs::CWD
+
+use crate::fd::OwnedFd;
+use crate::ffi::CStr;
+#[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+use crate::fs::Access;
+#[cfg(not(target_os = "espidf"))]
+use crate::fs::AtFlags;
+#[cfg(apple)]
+use crate::fs::CloneFlags;
+#[cfg(linux_kernel)]
+use crate::fs::RenameFlags;
+#[cfg(not(target_os = "espidf"))]
+use crate::fs::Stat;
+#[cfg(not(any(apple, target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+use crate::fs::{Dev, FileType};
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+use crate::fs::{Gid, Uid};
+use crate::fs::{Mode, OFlags};
+use crate::{backend, io, path};
+use backend::fd::{AsFd, BorrowedFd};
+use core::mem::MaybeUninit;
+use core::slice;
+#[cfg(feature = "alloc")]
+use {crate::ffi::CString, crate::path::SMALL_PATH_BUFFER_SIZE, alloc::vec::Vec};
+#[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+use {crate::fs::Timestamps, crate::timespec::Nsecs};
+
+/// `UTIME_NOW` for use with [`utimensat`].
+///
+/// [`utimensat`]: crate::fs::utimensat
+#[cfg(not(any(target_os = "espidf", target_os = "redox", target_os = "vita")))]
+pub const UTIME_NOW: Nsecs = backend::c::UTIME_NOW as Nsecs;
+
+/// `UTIME_OMIT` for use with [`utimensat`].
+///
+/// [`utimensat`]: crate::fs::utimensat
+#[cfg(not(any(target_os = "espidf", target_os = "redox", target_os = "vita")))]
+pub const UTIME_OMIT: Nsecs = backend::c::UTIME_OMIT as Nsecs;
+
+/// `openat(dirfd, path, oflags, mode)`—Opens a file.
+///
+/// POSIX guarantees that `openat` will use the lowest unused file descriptor,
+/// however it is not safe in general to rely on this, as file descriptors may
+/// be unexpectedly allocated on other threads or in libraries.
+///
+/// The `Mode` argument is only significant when creating a file.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/openat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/openat.2.html
+#[inline]
+pub fn openat<P: path::Arg, Fd: AsFd>(
+    dirfd: Fd,
+    path: P,
+    oflags: OFlags,
+    create_mode: Mode,
+) -> io::Result<OwnedFd> {
+    path.into_with_c_str(|path| {
+        backend::fs::syscalls::openat(dirfd.as_fd(), path, oflags, create_mode)
+    })
+}
+
+/// `readlinkat(fd, path)`—Reads the contents of a symlink.
+///
+/// If `reuse` already has available capacity, reuse it if possible.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/readlinkat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/readlinkat.2.html
+#[cfg(feature = "alloc")]
+#[inline]
+pub fn readlinkat<P: path::Arg, Fd: AsFd, B: Into<Vec<u8>>>(
+    dirfd: Fd,
+    path: P,
+    reuse: B,
+) -> io::Result<CString> {
+    path.into_with_c_str(|path| _readlinkat(dirfd.as_fd(), path, reuse.into()))
+}
+
+#[cfg(feature = "alloc")]
+#[allow(unsafe_code)]
+fn _readlinkat(dirfd: BorrowedFd<'_>, path: &CStr, mut buffer: Vec<u8>) -> io::Result<CString> {
+    buffer.clear();
+    buffer.reserve(SMALL_PATH_BUFFER_SIZE);
+
+    loop {
+        let nread =
+            backend::fs::syscalls::readlinkat(dirfd.as_fd(), path, buffer.spare_capacity_mut())?;
+
+        debug_assert!(nread <= buffer.capacity());
+        if nread < buffer.capacity() {
+            // SAFETY: From the [documentation]: “On success, these calls
+            // return the number of bytes placed in buf.”
+            //
+            // [documentation]: https://man7.org/linux/man-pages/man2/readlinkat.2.html
+            unsafe {
+                buffer.set_len(nread);
+            }
+
+            // SAFETY:
+            // - “readlink places the contents of the symbolic link pathname in
+            //   the buffer buf”
+            // - [POSIX definition 3.271: Pathname]: “A string that is used to
+            //   identify a file.”
+            // - [POSIX definition 3.375: String]: “A contiguous sequence of
+            //   bytes terminated by and including the first null byte.”
+            // - “readlink does not append a terminating null byte to buf.”
+            //
+            // Thus, there will be no NUL bytes in the string.
+            //
+            // [POSIX definition 3.271: Pathname]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_271
+            // [POSIX definition 3.375: String]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_375
+            unsafe {
+                return Ok(CString::from_vec_unchecked(buffer));
+            }
+        }
+
+        // Use `Vec` reallocation strategy to grow capacity exponentially.
+        buffer.reserve(buffer.capacity() + 1);
+    }
+}
+
+/// `readlinkat(fd, path)`—Reads the contents of a symlink, without
+/// allocating.
+///
+/// This is the "raw" version which avoids allocating, but which is
+/// significantly trickier to use; most users should use plain [`readlinkat`].
+///
+/// This version writes bytes into the buffer and returns two slices, one
+/// containing the written bytes, and one containint the remaining
+/// uninitialized space. If the number of written bytes is equal to the length
+/// of the buffer, it means the buffer wasn't big enough to hold the full
+/// string, and callers should try again with a bigger buffer.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/readlinkat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/readlinkat.2.html
+#[inline]
+pub fn readlinkat_raw<P: path::Arg, Fd: AsFd>(
+    dirfd: Fd,
+    path: P,
+    buf: &mut [MaybeUninit<u8>],
+) -> io::Result<(&mut [u8], &mut [MaybeUninit<u8>])> {
+    path.into_with_c_str(|path| _readlinkat_raw(dirfd.as_fd(), path, buf))
+}
+
+#[allow(unsafe_code)]
+fn _readlinkat_raw<'a>(
+    dirfd: BorrowedFd<'_>,
+    path: &CStr,
+    buf: &'a mut [MaybeUninit<u8>],
+) -> io::Result<(&'a mut [u8], &'a mut [MaybeUninit<u8>])> {
+    let n = backend::fs::syscalls::readlinkat(dirfd.as_fd(), path, buf)?;
+    unsafe {
+        Ok((
+            slice::from_raw_parts_mut(buf.as_mut_ptr().cast::<u8>(), n),
+            &mut buf[n..],
+        ))
+    }
+}
+
+/// `mkdirat(fd, path, mode)`—Creates a directory.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/mkdirat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/mkdirat.2.html
+#[inline]
+pub fn mkdirat<P: path::Arg, Fd: AsFd>(dirfd: Fd, path: P, mode: Mode) -> io::Result<()> {
+    path.into_with_c_str(|path| backend::fs::syscalls::mkdirat(dirfd.as_fd(), path, mode))
+}
+
+/// `linkat(old_dirfd, old_path, new_dirfd, new_path, flags)`—Creates a hard
+/// link.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/linkat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/linkat.2.html
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+pub fn linkat<P: path::Arg, Q: path::Arg, PFd: AsFd, QFd: AsFd>(
+    old_dirfd: PFd,
+    old_path: P,
+    new_dirfd: QFd,
+    new_path: Q,
+    flags: AtFlags,
+) -> io::Result<()> {
+    old_path.into_with_c_str(|old_path| {
+        new_path.into_with_c_str(|new_path| {
+            backend::fs::syscalls::linkat(
+                old_dirfd.as_fd(),
+                old_path,
+                new_dirfd.as_fd(),
+                new_path,
+                flags,
+            )
+        })
+    })
+}
+
+/// `unlinkat(fd, path, flags)`—Unlinks a file or remove a directory.
+///
+/// With the [`REMOVEDIR`] flag, this removes a directory. This is in place of
+/// a `rmdirat` function.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [`REMOVEDIR`]: AtFlags::REMOVEDIR
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/unlinkat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/unlinkat.2.html
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+pub fn unlinkat<P: path::Arg, Fd: AsFd>(dirfd: Fd, path: P, flags: AtFlags) -> io::Result<()> {
+    path.into_with_c_str(|path| backend::fs::syscalls::unlinkat(dirfd.as_fd(), path, flags))
+}
+
+/// `renameat(old_dirfd, old_path, new_dirfd, new_path)`—Renames a file or
+/// directory.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/renameat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/renameat.2.html
+#[inline]
+pub fn renameat<P: path::Arg, Q: path::Arg, PFd: AsFd, QFd: AsFd>(
+    old_dirfd: PFd,
+    old_path: P,
+    new_dirfd: QFd,
+    new_path: Q,
+) -> io::Result<()> {
+    old_path.into_with_c_str(|old_path| {
+        new_path.into_with_c_str(|new_path| {
+            backend::fs::syscalls::renameat(
+                old_dirfd.as_fd(),
+                old_path,
+                new_dirfd.as_fd(),
+                new_path,
+            )
+        })
+    })
+}
+
+/// `renameat2(old_dirfd, old_path, new_dirfd, new_path, flags)`—Renames a
+/// file or directory.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/renameat2.2.html
+#[cfg(linux_kernel)]
+#[inline]
+#[doc(alias = "renameat2")]
+pub fn renameat_with<P: path::Arg, Q: path::Arg, PFd: AsFd, QFd: AsFd>(
+    old_dirfd: PFd,
+    old_path: P,
+    new_dirfd: QFd,
+    new_path: Q,
+    flags: RenameFlags,
+) -> io::Result<()> {
+    old_path.into_with_c_str(|old_path| {
+        new_path.into_with_c_str(|new_path| {
+            backend::fs::syscalls::renameat2(
+                old_dirfd.as_fd(),
+                old_path,
+                new_dirfd.as_fd(),
+                new_path,
+                flags,
+            )
+        })
+    })
+}
+
+/// `symlinkat(old_path, new_dirfd, new_path)`—Creates a symlink.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/symlinkat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/symlinkat.2.html
+#[inline]
+pub fn symlinkat<P: path::Arg, Q: path::Arg, Fd: AsFd>(
+    old_path: P,
+    new_dirfd: Fd,
+    new_path: Q,
+) -> io::Result<()> {
+    old_path.into_with_c_str(|old_path| {
+        new_path.into_with_c_str(|new_path| {
+            backend::fs::syscalls::symlinkat(old_path, new_dirfd.as_fd(), new_path)
+        })
+    })
+}
+
+/// `fstatat(dirfd, path, flags)`—Queries metadata for a file or directory.
+///
+/// [`Mode::from_raw_mode`] and [`FileType::from_raw_mode`] may be used to
+/// interpret the `st_mode` field.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fstatat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fstatat.2.html
+/// [`Mode::from_raw_mode`]: crate::fs::Mode::from_raw_mode
+/// [`FileType::from_raw_mode`]: crate::fs::FileType::from_raw_mode
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+#[doc(alias = "fstatat")]
+pub fn statat<P: path::Arg, Fd: AsFd>(dirfd: Fd, path: P, flags: AtFlags) -> io::Result<Stat> {
+    path.into_with_c_str(|path| backend::fs::syscalls::statat(dirfd.as_fd(), path, flags))
+}
+
+/// `faccessat(dirfd, path, access, flags)`—Tests permissions for a file or
+/// directory.
+///
+/// On Linux before 5.8, this function uses the `faccessat` system call which
+/// doesn't support any flags. This function emulates support for the
+/// [`AtFlags::EACCESS`] flag by checking whether the uid and gid of the
+/// process match the effective uid and gid, in which case the `EACCESS` flag
+/// can be ignored. In Linux 5.8 and beyond `faccessat2` is used, which
+/// supports flags.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/faccessat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/faccessat.2.html
+#[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+#[inline]
+#[doc(alias = "faccessat")]
+pub fn accessat<P: path::Arg, Fd: AsFd>(
+    dirfd: Fd,
+    path: P,
+    access: Access,
+    flags: AtFlags,
+) -> io::Result<()> {
+    path.into_with_c_str(|path| backend::fs::syscalls::accessat(dirfd.as_fd(), path, access, flags))
+}
+
+/// `utimensat(dirfd, path, times, flags)`—Sets file or directory timestamps.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/utimensat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/utimensat.2.html
+#[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+#[inline]
+pub fn utimensat<P: path::Arg, Fd: AsFd>(
+    dirfd: Fd,
+    path: P,
+    times: &Timestamps,
+    flags: AtFlags,
+) -> io::Result<()> {
+    path.into_with_c_str(|path| backend::fs::syscalls::utimensat(dirfd.as_fd(), path, times, flags))
+}
+
+/// `fchmodat(dirfd, path, mode, flags)`—Sets file or directory permissions.
+///
+/// Platform support for flags varies widely, for example on Linux
+/// [`AtFlags::SYMLINK_NOFOLLOW`] is not implemented and therefore
+/// [`io::Errno::OPNOTSUPP`] will be returned.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fchmodat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fchmodat.2.html
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+#[inline]
+#[doc(alias = "fchmodat")]
+pub fn chmodat<P: path::Arg, Fd: AsFd>(
+    dirfd: Fd,
+    path: P,
+    mode: Mode,
+    flags: AtFlags,
+) -> io::Result<()> {
+    path.into_with_c_str(|path| backend::fs::syscalls::chmodat(dirfd.as_fd(), path, mode, flags))
+}
+
+/// `fclonefileat(src, dst_dir, dst, flags)`—Efficiently copies between files.
+///
+/// # References
+///  - [Apple]
+///
+/// [Apple]: https://opensource.apple.com/source/xnu/xnu-3789.21.4/bsd/man/man2/clonefile.2.auto.html
+#[cfg(apple)]
+#[inline]
+pub fn fclonefileat<Fd: AsFd, DstFd: AsFd, P: path::Arg>(
+    src: Fd,
+    dst_dir: DstFd,
+    dst: P,
+    flags: CloneFlags,
+) -> io::Result<()> {
+    dst.into_with_c_str(|dst| {
+        backend::fs::syscalls::fclonefileat(src.as_fd(), dst_dir.as_fd(), dst, flags)
+    })
+}
+
+/// `mknodat(dirfd, path, mode, dev)`—Creates special or normal files.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/mknodat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/mknodat.2.html
+#[cfg(not(any(apple, target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+#[inline]
+pub fn mknodat<P: path::Arg, Fd: AsFd>(
+    dirfd: Fd,
+    path: P,
+    file_type: FileType,
+    mode: Mode,
+    dev: Dev,
+) -> io::Result<()> {
+    path.into_with_c_str(|path| {
+        backend::fs::syscalls::mknodat(dirfd.as_fd(), path, file_type, mode, dev)
+    })
+}
+
+/// `fchownat(dirfd, path, owner, group, flags)`—Sets file or directory
+/// ownership.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fchownat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fchownat.2.html
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+#[inline]
+#[doc(alias = "fchownat")]
+pub fn chownat<P: path::Arg, Fd: AsFd>(
+    dirfd: Fd,
+    path: P,
+    owner: Option<Uid>,
+    group: Option<Gid>,
+    flags: AtFlags,
+) -> io::Result<()> {
+    path.into_with_c_str(|path| {
+        backend::fs::syscalls::chownat(dirfd.as_fd(), path, owner, group, flags)
+    })
+}
diff --git a/vendor/rustix/src/fs/constants.rs b/vendor/rustix/src/fs/constants.rs
new file mode 100644
index 0000000..a9237af
--- /dev/null
+++ b/vendor/rustix/src/fs/constants.rs
@@ -0,0 +1,7 @@
+//! Filesystem API constants, translated into `bitflags` constants.
+
+use crate::backend;
+
+pub use crate::io::FdFlags;
+pub use crate::timespec::{Nsecs, Secs, Timespec};
+pub use backend::fs::types::*;
diff --git a/vendor/rustix/src/fs/copy_file_range.rs b/vendor/rustix/src/fs/copy_file_range.rs
new file mode 100644
index 0000000..b927d57
--- /dev/null
+++ b/vendor/rustix/src/fs/copy_file_range.rs
@@ -0,0 +1,20 @@
+use crate::{backend, io};
+use backend::fd::AsFd;
+
+/// `copy_file_range(fd_in, off_in, fd_out, off_out, len, 0)`—Copies data
+/// from one file to another.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/copy_file_range.2.html
+#[inline]
+pub fn copy_file_range<InFd: AsFd, OutFd: AsFd>(
+    fd_in: InFd,
+    off_in: Option<&mut u64>,
+    fd_out: OutFd,
+    off_out: Option<&mut u64>,
+    len: usize,
+) -> io::Result<usize> {
+    backend::fs::syscalls::copy_file_range(fd_in.as_fd(), off_in, fd_out.as_fd(), off_out, len)
+}
diff --git a/vendor/rustix/src/fs/cwd.rs b/vendor/rustix/src/fs/cwd.rs
new file mode 100644
index 0000000..e66360e
--- /dev/null
+++ b/vendor/rustix/src/fs/cwd.rs
@@ -0,0 +1,39 @@
+//! The `cwd` function, representing the current working directory.
+//!
+//! # Safety
+//!
+//! This file uses `AT_FDCWD`, which is a raw file descriptor, but which is
+//! always valid.
+
+#![allow(unsafe_code)]
+
+use crate::backend;
+use backend::c;
+use backend::fd::{BorrowedFd, RawFd};
+
+/// `AT_FDCWD`—A handle representing the current working directory.
+///
+/// This is a file descriptor which refers to the process current directory
+/// which can be used as the directory argument in `*at` functions such as
+/// [`openat`].
+///
+/// # References
+///  - [POSIX]
+///
+/// [`openat`]: crate::fs::openat
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/fcntl.h.html
+// SAFETY: `AT_FDCWD` is a reserved value that is never dynamically
+// allocated, so it'll remain valid for the duration of `'static`.
+#[doc(alias = "AT_FDCWD")]
+pub const CWD: BorrowedFd<'static> =
+    unsafe { BorrowedFd::<'static>::borrow_raw(c::AT_FDCWD as RawFd) };
+
+/// Return the value of [`CWD`].
+#[deprecated(note = "Use `CWD` in place of `cwd()`.")]
+pub const fn cwd() -> BorrowedFd<'static> {
+    let at_fdcwd = c::AT_FDCWD as RawFd;
+
+    // SAFETY: `AT_FDCWD` is a reserved value that is never dynamically
+    // allocated, so it'll remain valid for the duration of `'static`.
+    unsafe { BorrowedFd::<'static>::borrow_raw(at_fdcwd) }
+}
diff --git a/vendor/rustix/src/fs/dir.rs b/vendor/rustix/src/fs/dir.rs
new file mode 100644
index 0000000..b3e1e3b
--- /dev/null
+++ b/vendor/rustix/src/fs/dir.rs
@@ -0,0 +1,5 @@
+//! `Dir` and `DirEntry`.
+
+use crate::backend;
+
+pub use backend::fs::dir::{Dir, DirEntry};
diff --git a/vendor/rustix/src/fs/fadvise.rs b/vendor/rustix/src/fs/fadvise.rs
new file mode 100644
index 0000000..a760a18
--- /dev/null
+++ b/vendor/rustix/src/fs/fadvise.rs
@@ -0,0 +1,18 @@
+use crate::{backend, io};
+use backend::fd::AsFd;
+use backend::fs::types::Advice;
+
+/// `posix_fadvise(fd, offset, len, advice)`—Declares an expected access
+/// pattern for a file.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_fadvise.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/posix_fadvise.2.html
+#[inline]
+#[doc(alias = "posix_fadvise")]
+pub fn fadvise<Fd: AsFd>(fd: Fd, offset: u64, len: u64, advice: Advice) -> io::Result<()> {
+    backend::fs::syscalls::fadvise(fd.as_fd(), offset, len, advice)
+}
diff --git a/vendor/rustix/src/fs/fcntl.rs b/vendor/rustix/src/fs/fcntl.rs
new file mode 100644
index 0000000..f80db84
--- /dev/null
+++ b/vendor/rustix/src/fs/fcntl.rs
@@ -0,0 +1,112 @@
+//! The Unix `fcntl` function is effectively lots of different functions hidden
+//! behind a single dynamic dispatch interface. In order to provide a type-safe
+//! API, rustix makes them all separate functions so that they can have
+//! dedicated static type signatures.
+
+#[cfg(not(any(
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+use crate::fs::FlockOperation;
+use crate::{backend, io};
+use backend::fd::AsFd;
+use backend::fs::types::OFlags;
+
+// These `fcntl` functions live in the `io` module because they're not specific
+// to files, directories, or memfd objects. We re-export them here in the `fs`
+// module because the other the `fcntl` functions are here.
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+pub use crate::io::fcntl_dupfd_cloexec;
+pub use crate::io::{fcntl_getfd, fcntl_setfd};
+
+/// `fcntl(fd, F_GETFL)`—Returns a file descriptor's access mode and status.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
+#[inline]
+#[doc(alias = "F_GETFL")]
+pub fn fcntl_getfl<Fd: AsFd>(fd: Fd) -> io::Result<OFlags> {
+    backend::fs::syscalls::fcntl_getfl(fd.as_fd())
+}
+
+/// `fcntl(fd, F_SETFL, flags)`—Sets a file descriptor's status.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
+#[inline]
+#[doc(alias = "F_SETFL")]
+pub fn fcntl_setfl<Fd: AsFd>(fd: Fd, flags: OFlags) -> io::Result<()> {
+    backend::fs::syscalls::fcntl_setfl(fd.as_fd(), flags)
+}
+
+/// `fcntl(fd, F_GET_SEALS)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "F_GET_SEALS")]
+pub fn fcntl_get_seals<Fd: AsFd>(fd: Fd) -> io::Result<SealFlags> {
+    backend::fs::syscalls::fcntl_get_seals(fd.as_fd())
+}
+
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
+use backend::fs::types::SealFlags;
+
+/// `fcntl(fd, F_ADD_SEALS)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "F_ADD_SEALS")]
+pub fn fcntl_add_seals<Fd: AsFd>(fd: Fd, seals: SealFlags) -> io::Result<()> {
+    backend::fs::syscalls::fcntl_add_seals(fd.as_fd(), seals)
+}
+
+/// `fcntl(fd, F_SETLK)`—Acquire or release an `fcntl`-style lock.
+///
+/// This function doesn't currently have an offset or len; it currently always
+/// sets the `l_len` field to 0, which is a special case that means the entire
+/// file should be locked.
+///
+/// Unlike `flock`-style locks, `fcntl`-style locks are process-associated,
+/// meaning that they don't guard against being acquired by two threads in the
+/// same process.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
+#[cfg(not(any(
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+#[doc(alias = "F_SETLK")]
+#[doc(alias = "F_SETLKW")]
+pub fn fcntl_lock<Fd: AsFd>(fd: Fd, operation: FlockOperation) -> io::Result<()> {
+    backend::fs::syscalls::fcntl_lock(fd.as_fd(), operation)
+}
diff --git a/vendor/rustix/src/fs/fcntl_apple.rs b/vendor/rustix/src/fs/fcntl_apple.rs
new file mode 100644
index 0000000..a32e46d
--- /dev/null
+++ b/vendor/rustix/src/fs/fcntl_apple.rs
@@ -0,0 +1,66 @@
+use crate::{backend, io};
+use backend::fd::AsFd;
+
+/// `fcntl(fd, F_RDADVISE, radvisory { offset, len })`
+///
+/// # References
+///  - [Apple]
+///
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
+#[doc(alias = "F_RDADVISE")]
+#[inline]
+pub fn fcntl_rdadvise<Fd: AsFd>(fd: Fd, offset: u64, len: u64) -> io::Result<()> {
+    backend::fs::syscalls::fcntl_rdadvise(fd.as_fd(), offset, len)
+}
+
+/// `fcntl(fd, F_FULLFSYNC)`
+///
+/// # References
+///  - [Apple]
+///
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
+#[doc(alias = "F_FULLSYNC")]
+#[inline]
+pub fn fcntl_fullfsync<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    backend::fs::syscalls::fcntl_fullfsync(fd.as_fd())
+}
+
+/// `fcntl(fd, F_NOCACHE, value)`—Turn data caching off or on for a file
+/// descriptor.
+///
+/// See [this mailing list post] for additional information about the meanings
+/// of `F_NOCACHE` and `F_GLOBAL_NOCACHE`.
+///
+/// [this mailing list post]: https://lists.apple.com/archives/filesystem-dev/2007/Sep/msg00010.html
+///
+/// See also [`fcntl_global_nocache`].
+///
+/// # References
+///  - [Apple]
+///
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
+#[doc(alias = "F_NOCACHE")]
+#[inline]
+pub fn fcntl_nocache<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::fs::syscalls::fcntl_nocache(fd.as_fd(), value)
+}
+
+/// `fcntl(fd, F_GLOBAL_NOCACHE, value)`—Turn data caching off or on for all
+/// file descriptors.
+///
+/// See [this mailing list post] for additional information about the meanings
+/// of `F_NOCACHE` and `F_GLOBAL_NOCACHE`.
+///
+/// [this mailing list post]: https://lists.apple.com/archives/filesystem-dev/2007/Sep/msg00010.html
+///
+/// See also [`fcntl_nocache`].
+///
+/// # References
+///  - [Apple]
+///
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
+#[doc(alias = "F_GLOBAL_NOCACHE")]
+#[inline]
+pub fn fcntl_global_nocache<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::fs::syscalls::fcntl_global_nocache(fd.as_fd(), value)
+}
diff --git a/vendor/rustix/src/fs/fcopyfile.rs b/vendor/rustix/src/fs/fcopyfile.rs
new file mode 100644
index 0000000..e8f26ff
--- /dev/null
+++ b/vendor/rustix/src/fs/fcopyfile.rs
@@ -0,0 +1,88 @@
+use crate::fs::CopyfileFlags;
+use crate::{backend, io};
+use backend::fd::AsFd;
+use backend::fs::types::copyfile_state_t;
+
+/// `fcopyfile(from, to, state, flags)`
+///
+/// # Safety
+///
+/// The `state` operand must be allocated with `copyfile_state_alloc` and not
+/// yet freed with `copyfile_state_free`.
+///
+/// # References
+///  - [Apple]
+///
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/fcopyfile.3.html
+#[inline]
+pub unsafe fn fcopyfile<FromFd: AsFd, ToFd: AsFd>(
+    from: FromFd,
+    to: ToFd,
+    state: copyfile_state_t,
+    flags: CopyfileFlags,
+) -> io::Result<()> {
+    backend::fs::syscalls::fcopyfile(from.as_fd(), to.as_fd(), state, flags)
+}
+
+/// `copyfile_state_alloc()`
+///
+/// # References
+///  - [Apple]
+///
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/fcopyfile.3.html
+#[inline]
+pub fn copyfile_state_alloc() -> io::Result<copyfile_state_t> {
+    backend::fs::syscalls::copyfile_state_alloc()
+}
+
+/// `copyfile_state_free(state)`
+///
+/// # Safety
+///
+/// The `state` operand must be allocated with `copyfile_state_alloc` and not
+/// yet freed with `copyfile_state_free`.
+///
+/// # References
+///  - [Apple]
+///
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/fcopyfile.3.html
+#[inline]
+pub unsafe fn copyfile_state_free(state: copyfile_state_t) -> io::Result<()> {
+    backend::fs::syscalls::copyfile_state_free(state)
+}
+
+/// `copyfile_state_get(state, COPYFILE_STATE_COPIED)`
+///
+/// # Safety
+///
+/// The `state` operand must be allocated with `copyfile_state_alloc` and not
+/// yet freed with `copyfile_state_free`.
+///
+/// # References
+///  - [Apple]
+///
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/fcopyfile.3.html
+#[inline]
+pub unsafe fn copyfile_state_get_copied(state: copyfile_state_t) -> io::Result<u64> {
+    backend::fs::syscalls::copyfile_state_get_copied(state)
+}
+
+/// `copyfile_state_get(state, flags, dst)`
+///
+/// # Safety
+///
+/// The `state` operand must be allocated with `copyfile_state_alloc` and not
+/// yet freed with `copyfile_state_free`.
+///
+/// # References
+///  - [Apple]
+///
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/fcopyfile.3.html
+#[inline]
+pub unsafe fn copyfile_state_get(
+    state: copyfile_state_t,
+    flag: u32,
+    dst: *mut core::ffi::c_void,
+) -> io::Result<()> {
+    backend::fs::syscalls::copyfile_state_get(state, flag, dst)
+}
diff --git a/vendor/rustix/src/fs/fd.rs b/vendor/rustix/src/fs/fd.rs
new file mode 100644
index 0000000..3ef4b38
--- /dev/null
+++ b/vendor/rustix/src/fs/fd.rs
@@ -0,0 +1,357 @@
+//! Functions which operate on file descriptors.
+
+#[cfg(not(target_os = "wasi"))]
+use crate::fs::Mode;
+#[cfg(not(target_os = "wasi"))]
+use crate::fs::{Gid, Uid};
+use crate::fs::{OFlags, SeekFrom, Timespec};
+use crate::{backend, io};
+use backend::fd::{AsFd, BorrowedFd};
+#[cfg(not(any(
+    netbsdlike,
+    solarish,
+    target_os = "aix",
+    target_os = "dragonfly",
+    target_os = "espidf",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+)))]
+use backend::fs::types::FallocateFlags;
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "solaris",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+use backend::fs::types::FlockOperation;
+#[cfg(linux_kernel)]
+use backend::fs::types::FsWord;
+use backend::fs::types::Stat;
+#[cfg(not(any(
+    solarish,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "netbsd",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+use backend::fs::types::StatFs;
+#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+use backend::fs::types::StatVfs;
+
+/// Timestamps used by [`utimensat`] and [`futimens`].
+///
+/// [`utimensat`]: crate::fs::utimensat
+/// [`futimens`]: crate::fs::futimens
+// This is `repr(C)` and specifically laid out to match the representation used
+// by `utimensat` and `futimens`, which expect 2-element arrays of timestamps.
+#[repr(C)]
+#[derive(Clone, Debug)]
+pub struct Timestamps {
+    /// The timestamp of the last access to a filesystem object.
+    pub last_access: Timespec,
+
+    /// The timestamp of the last modification of a filesystem object.
+    pub last_modification: Timespec,
+}
+
+/// The filesystem magic number for procfs.
+///
+/// See [the `fstatfs` manual page] for more information.
+///
+/// [the `fstatfs` manual page]: https://man7.org/linux/man-pages/man2/fstatfs.2.html#DESCRIPTION
+#[cfg(linux_kernel)]
+pub const PROC_SUPER_MAGIC: FsWord = backend::c::PROC_SUPER_MAGIC as FsWord;
+
+/// The filesystem magic number for NFS.
+///
+/// See [the `fstatfs` manual page] for more information.
+///
+/// [the `fstatfs` manual page]: https://man7.org/linux/man-pages/man2/fstatfs.2.html#DESCRIPTION
+#[cfg(linux_kernel)]
+pub const NFS_SUPER_MAGIC: FsWord = backend::c::NFS_SUPER_MAGIC as FsWord;
+
+/// `lseek(fd, offset, whence)`—Repositions a file descriptor within a file.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/lseek.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/lseek.2.html
+#[inline]
+#[doc(alias = "lseek")]
+pub fn seek<Fd: AsFd>(fd: Fd, pos: SeekFrom) -> io::Result<u64> {
+    backend::fs::syscalls::seek(fd.as_fd(), pos)
+}
+
+/// `lseek(fd, 0, SEEK_CUR)`—Returns the current position within a file.
+///
+/// Return the current position of the file descriptor. This is a subset of
+/// the functionality of `seek`, but this interface makes it easier for users
+/// to declare their intent not to mutate any state.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/lseek.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/lseek.2.html
+#[inline]
+#[doc(alias = "lseek")]
+pub fn tell<Fd: AsFd>(fd: Fd) -> io::Result<u64> {
+    backend::fs::syscalls::tell(fd.as_fd())
+}
+
+/// `fchmod(fd, mode)`—Sets open file or directory permissions.
+///
+/// This implementation does not support [`OFlags::PATH`] file descriptors,
+/// even on platforms where the host libc emulates it.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fchmod.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fchmod.2.html
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub fn fchmod<Fd: AsFd>(fd: Fd, mode: Mode) -> io::Result<()> {
+    backend::fs::syscalls::fchmod(fd.as_fd(), mode)
+}
+
+/// `fchown(fd, owner, group)`—Sets open file or directory ownership.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fchown.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fchown.2.html
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub fn fchown<Fd: AsFd>(fd: Fd, owner: Option<Uid>, group: Option<Gid>) -> io::Result<()> {
+    backend::fs::syscalls::fchown(fd.as_fd(), owner, group)
+}
+
+/// `fstat(fd)`—Queries metadata for an open file or directory.
+///
+/// [`Mode::from_raw_mode`] and [`FileType::from_raw_mode`] may be used to
+/// interpret the `st_mode` field.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fstat.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fstat.2.html
+/// [`Mode::from_raw_mode`]: Mode::from_raw_mode
+/// [`FileType::from_raw_mode`]: crate::fs::FileType::from_raw_mode
+#[inline]
+pub fn fstat<Fd: AsFd>(fd: Fd) -> io::Result<Stat> {
+    backend::fs::syscalls::fstat(fd.as_fd())
+}
+
+/// `fstatfs(fd)`—Queries filesystem statistics for an open file or directory.
+///
+/// Compared to [`fstatvfs`], this function often provides more information,
+/// though it's less portable.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/fstatfs.2.html
+#[cfg(not(any(
+    solarish,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "netbsd",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+#[inline]
+pub fn fstatfs<Fd: AsFd>(fd: Fd) -> io::Result<StatFs> {
+    backend::fs::syscalls::fstatfs(fd.as_fd())
+}
+
+/// `fstatvfs(fd)`—Queries filesystem statistics for an open file or
+/// directory, POSIX version.
+///
+/// Compared to [`fstatfs`], this function often provides less information,
+/// but it is more portable. But even so, filesystems are very diverse and not
+/// all the fields are meaningful for every filesystem. And `f_fsid` doesn't
+/// seem to have a clear meaning anywhere.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fstatvfs.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fstatvfs.2.html
+#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+#[inline]
+pub fn fstatvfs<Fd: AsFd>(fd: Fd) -> io::Result<StatVfs> {
+    backend::fs::syscalls::fstatvfs(fd.as_fd())
+}
+
+/// `futimens(fd, times)`—Sets timestamps for an open file or directory.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/futimens.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/utimensat.2.html
+#[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+#[inline]
+pub fn futimens<Fd: AsFd>(fd: Fd, times: &Timestamps) -> io::Result<()> {
+    backend::fs::syscalls::futimens(fd.as_fd(), times)
+}
+
+/// `fallocate(fd, mode, offset, len)`—Adjusts file allocation.
+///
+/// This is a more general form of `posix_fallocate`, adding a `mode` argument
+/// which modifies the behavior. On platforms which only support
+/// `posix_fallocate` and not the more general form, no `FallocateFlags` values
+/// are defined so it will always be empty.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux `fallocate`]
+///  - [Linux `posix_fallocate`]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_fallocate.html
+/// [Linux `fallocate`]: https://man7.org/linux/man-pages/man2/fallocate.2.html
+/// [Linux `posix_fallocate`]: https://man7.org/linux/man-pages/man3/posix_fallocate.3.html
+#[cfg(not(any(
+    netbsdlike,
+    solarish,
+    target_os = "aix",
+    target_os = "dragonfly",
+    target_os = "espidf",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+)))] // not implemented in libc for netbsd yet
+#[inline]
+#[doc(alias = "posix_fallocate")]
+pub fn fallocate<Fd: AsFd>(fd: Fd, mode: FallocateFlags, offset: u64, len: u64) -> io::Result<()> {
+    backend::fs::syscalls::fallocate(fd.as_fd(), mode, offset, len)
+}
+
+/// `fcntl(fd, F_GETFL) & O_ACCMODE`
+///
+/// Returns a pair of booleans indicating whether the file descriptor is
+/// readable and/or writable, respectively. This is only reliable on files; for
+/// example, it doesn't reflect whether sockets have been shut down; for
+/// general I/O handle support, use [`io::is_read_write`].
+#[inline]
+pub fn is_file_read_write<Fd: AsFd>(fd: Fd) -> io::Result<(bool, bool)> {
+    _is_file_read_write(fd.as_fd())
+}
+
+pub(crate) fn _is_file_read_write(fd: BorrowedFd<'_>) -> io::Result<(bool, bool)> {
+    let mode = backend::fs::syscalls::fcntl_getfl(fd)?;
+
+    // Check for `O_PATH`.
+    #[cfg(any(linux_kernel, target_os = "emscripten", target_os = "fuchsia"))]
+    if mode.contains(OFlags::PATH) {
+        return Ok((false, false));
+    }
+
+    // Use `RWMODE` rather than `ACCMODE` as `ACCMODE` may include `O_PATH`.
+    // We handled `O_PATH` above.
+    match mode & OFlags::RWMODE {
+        OFlags::RDONLY => Ok((true, false)),
+        OFlags::RDWR => Ok((true, true)),
+        OFlags::WRONLY => Ok((false, true)),
+        _ => unreachable!(),
+    }
+}
+
+/// `fsync(fd)`—Ensures that file data and metadata is written to the
+/// underlying storage device.
+///
+/// On iOS and macOS this isn't sufficient to ensure that data has reached
+/// persistent storage; use [`fcntl_fullfsync`] to ensure that.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fsync.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fsync.2.html
+/// [`fcntl_fullfsync`]: https://docs.rs/rustix/*/x86_64-apple-darwin/rustix/fs/fn.fcntl_fullfsync.html
+#[inline]
+pub fn fsync<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    backend::fs::syscalls::fsync(fd.as_fd())
+}
+
+/// `fdatasync(fd)`—Ensures that file data is written to the underlying
+/// storage device.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fdatasync.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fdatasync.2.html
+#[cfg(not(any(
+    apple,
+    target_os = "dragonfly",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "redox",
+    target_os = "vita",
+)))]
+#[inline]
+pub fn fdatasync<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    backend::fs::syscalls::fdatasync(fd.as_fd())
+}
+
+/// `ftruncate(fd, length)`—Sets the length of a file.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/ftruncate.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/ftruncate.2.html
+#[inline]
+pub fn ftruncate<Fd: AsFd>(fd: Fd, length: u64) -> io::Result<()> {
+    backend::fs::syscalls::ftruncate(fd.as_fd(), length)
+}
+
+/// `flock(fd, operation)`—Acquire or release an advisory lock on an open file.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/flock.2.html
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "solaris",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+pub fn flock<Fd: AsFd>(fd: Fd, operation: FlockOperation) -> io::Result<()> {
+    backend::fs::syscalls::flock(fd.as_fd(), operation)
+}
+
+/// `syncfs(fd)`—Flush cached filesystem data.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/syncfs.2.html
+#[cfg(linux_kernel)]
+#[inline]
+pub fn syncfs<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    backend::fs::syscalls::syncfs(fd.as_fd())
+}
diff --git a/vendor/rustix/src/fs/getpath.rs b/vendor/rustix/src/fs/getpath.rs
new file mode 100644
index 0000000..8e14ff2
--- /dev/null
+++ b/vendor/rustix/src/fs/getpath.rs
@@ -0,0 +1,14 @@
+use crate::ffi::CString;
+use crate::{backend, io};
+use backend::fd::AsFd;
+
+/// `fcntl(fd, F_GETPATH)`
+///
+/// # References
+///  - [Apple]
+///
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
+#[inline]
+pub fn getpath<Fd: AsFd>(fd: Fd) -> io::Result<CString> {
+    backend::fs::syscalls::getpath(fd.as_fd())
+}
diff --git a/vendor/rustix/src/fs/id.rs b/vendor/rustix/src/fs/id.rs
new file mode 100644
index 0000000..1fc2ef8
--- /dev/null
+++ b/vendor/rustix/src/fs/id.rs
@@ -0,0 +1 @@
+pub use crate::ugid::{Gid, Uid};
diff --git a/vendor/rustix/src/fs/ioctl.rs b/vendor/rustix/src/fs/ioctl.rs
new file mode 100644
index 0000000..7522275
--- /dev/null
+++ b/vendor/rustix/src/fs/ioctl.rs
@@ -0,0 +1,92 @@
+//! Filesystem-oriented `ioctl` functions.
+
+#![allow(unsafe_code)]
+
+#[cfg(linux_kernel)]
+use {
+    crate::fd::AsFd,
+    crate::{backend, io, ioctl},
+    backend::c,
+};
+
+#[cfg(all(linux_kernel, not(any(target_arch = "sparc", target_arch = "sparc64"))))]
+use crate::fd::{AsRawFd, BorrowedFd};
+
+/// `ioctl(fd, BLKSSZGET)`—Returns the logical block size of a block device.
+///
+/// This is mentioned in the [Linux `openat` manual page].
+///
+/// [Linux `openat` manual page]: https://man7.org/linux/man-pages/man2/openat.2.html
+#[cfg(linux_kernel)]
+#[inline]
+#[doc(alias = "BLKSSZGET")]
+pub fn ioctl_blksszget<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
+    // SAFETY: BLZSSZGET is a getter opcode that gets a u32.
+    unsafe {
+        let ctl = ioctl::Getter::<ioctl::BadOpcode<{ c::BLKSSZGET }>, c::c_uint>::new();
+        ioctl::ioctl(fd, ctl)
+    }
+}
+
+/// `ioctl(fd, BLKPBSZGET)`—Returns the physical block size of a block device.
+#[cfg(linux_kernel)]
+#[inline]
+#[doc(alias = "BLKPBSZGET")]
+pub fn ioctl_blkpbszget<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
+    // SAFETY: BLKPBSZGET is a getter opcode that gets a u32.
+    unsafe {
+        let ctl = ioctl::Getter::<ioctl::BadOpcode<{ c::BLKPBSZGET }>, c::c_uint>::new();
+        ioctl::ioctl(fd, ctl)
+    }
+}
+
+/// `ioctl(fd, FICLONE, src_fd)`—Share data between open files.
+///
+/// This ioctl is not available on Sparc platforms
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/ioctl_ficlone.2.html
+#[cfg(all(linux_kernel, not(any(target_arch = "sparc", target_arch = "sparc64"))))]
+#[inline]
+#[doc(alias = "FICLONE")]
+pub fn ioctl_ficlone<Fd: AsFd, SrcFd: AsFd>(fd: Fd, src_fd: SrcFd) -> io::Result<()> {
+    unsafe { ioctl::ioctl(fd, Ficlone(src_fd.as_fd())) }
+}
+
+/// `ioctl(fd, EXT4_IOC_RESIZE_FS, blocks)`—Resize ext4 filesystem on fd.
+#[cfg(linux_kernel)]
+#[inline]
+#[doc(alias = "EXT4_IOC_RESIZE_FS")]
+pub fn ext4_ioc_resize_fs<Fd: AsFd>(fd: Fd, blocks: u64) -> io::Result<()> {
+    // SAFETY: EXT4_IOC_RESIZE_FS is a pointer setter opcode.
+    unsafe {
+        let ctl = ioctl::Setter::<ioctl::BadOpcode<{ backend::fs::EXT4_IOC_RESIZE_FS }>, u64>::new(
+            blocks,
+        );
+        ioctl::ioctl(fd, ctl)
+    }
+}
+
+#[cfg(all(linux_kernel, not(any(target_arch = "sparc", target_arch = "sparc64"))))]
+struct Ficlone<'a>(BorrowedFd<'a>);
+
+#[cfg(all(linux_kernel, not(any(target_arch = "sparc", target_arch = "sparc64"))))]
+unsafe impl ioctl::Ioctl for Ficlone<'_> {
+    type Output = ();
+
+    const IS_MUTATING: bool = false;
+    const OPCODE: ioctl::Opcode = ioctl::Opcode::old(c::FICLONE as ioctl::RawOpcode);
+
+    fn as_ptr(&mut self) -> *mut c::c_void {
+        self.0.as_raw_fd() as *mut c::c_void
+    }
+
+    unsafe fn output_from_ptr(
+        _: ioctl::IoctlOutput,
+        _: *mut c::c_void,
+    ) -> io::Result<Self::Output> {
+        Ok(())
+    }
+}
diff --git a/vendor/rustix/src/fs/makedev.rs b/vendor/rustix/src/fs/makedev.rs
new file mode 100644
index 0000000..5793058
--- /dev/null
+++ b/vendor/rustix/src/fs/makedev.rs
@@ -0,0 +1,35 @@
+use crate::backend;
+use crate::fs::Dev;
+
+/// `makedev(maj, min)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man3/makedev.3.html
+#[inline]
+pub fn makedev(maj: u32, min: u32) -> Dev {
+    backend::fs::makedev::makedev(maj, min)
+}
+
+/// `minor(dev)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man3/minor.3.html
+#[inline]
+pub fn minor(dev: Dev) -> u32 {
+    backend::fs::makedev::minor(dev)
+}
+
+/// `major(dev)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man3/major.3.html
+#[inline]
+pub fn major(dev: Dev) -> u32 {
+    backend::fs::makedev::major(dev)
+}
diff --git a/vendor/rustix/src/fs/memfd_create.rs b/vendor/rustix/src/fs/memfd_create.rs
new file mode 100644
index 0000000..97154d2
--- /dev/null
+++ b/vendor/rustix/src/fs/memfd_create.rs
@@ -0,0 +1,18 @@
+use crate::fd::OwnedFd;
+use crate::{backend, io, path};
+use backend::fs::types::MemfdFlags;
+
+/// `memfd_create(name, flags)`
+///
+/// # References
+///  - [Linux]
+///  - [glibc]
+///  - [FreeBSD]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/memfd_create.2.html
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Memory_002dmapped-I_002fO.html#index-memfd_005fcreate
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?memfd_create
+#[inline]
+pub fn memfd_create<P: path::Arg>(name: P, flags: MemfdFlags) -> io::Result<OwnedFd> {
+    name.into_with_c_str(|name| backend::fs::syscalls::memfd_create(name, flags))
+}
diff --git a/vendor/rustix/src/fs/mod.rs b/vendor/rustix/src/fs/mod.rs
new file mode 100644
index 0000000..996bb4e
--- /dev/null
+++ b/vendor/rustix/src/fs/mod.rs
@@ -0,0 +1,143 @@
+//! Filesystem operations.
+
+mod abs;
+#[cfg(not(target_os = "redox"))]
+mod at;
+mod constants;
+#[cfg(linux_kernel)]
+mod copy_file_range;
+#[cfg(not(any(target_os = "espidf", target_os = "redox")))]
+#[cfg(not(target_os = "haiku"))] // Haiku needs <https://github.com/rust-lang/rust/pull/112371>
+mod cwd;
+#[cfg(all(feature = "alloc", not(any(target_os = "espidf", target_os = "redox"))))]
+mod dir;
+#[cfg(not(any(
+    apple,
+    netbsdlike,
+    solarish,
+    target_os = "dragonfly",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "redox",
+    target_os = "vita",
+)))]
+mod fadvise;
+pub(crate) mod fcntl;
+#[cfg(apple)]
+mod fcntl_apple;
+#[cfg(apple)]
+mod fcopyfile;
+pub(crate) mod fd;
+#[cfg(all(apple, feature = "alloc"))]
+mod getpath;
+#[cfg(not(target_os = "wasi"))] // WASI doesn't have get[gpu]id.
+mod id;
+#[cfg(linux_kernel)]
+mod ioctl;
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+mod makedev;
+#[cfg(any(linux_kernel, target_os = "freebsd"))]
+mod memfd_create;
+#[cfg(linux_kernel)]
+#[cfg(feature = "fs")]
+mod mount;
+#[cfg(linux_kernel)]
+mod openat2;
+#[cfg(linux_kernel)]
+mod raw_dir;
+mod seek_from;
+#[cfg(target_os = "linux")]
+mod sendfile;
+#[cfg(linux_kernel)]
+mod statx;
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+mod sync;
+#[cfg(any(apple, linux_kernel))]
+mod xattr;
+
+#[cfg(linux_kernel)]
+pub use crate::backend::fs::inotify;
+pub use abs::*;
+#[cfg(not(target_os = "redox"))]
+pub use at::*;
+pub use constants::*;
+#[cfg(linux_kernel)]
+pub use copy_file_range::copy_file_range;
+#[cfg(not(any(target_os = "espidf", target_os = "redox")))]
+#[cfg(not(target_os = "haiku"))] // Haiku needs <https://github.com/rust-lang/rust/pull/112371>
+pub use cwd::*;
+#[cfg(all(feature = "alloc", not(any(target_os = "espidf", target_os = "redox"))))]
+pub use dir::{Dir, DirEntry};
+#[cfg(not(any(
+    apple,
+    netbsdlike,
+    solarish,
+    target_os = "dragonfly",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "redox",
+    target_os = "vita",
+)))]
+pub use fadvise::fadvise;
+pub use fcntl::*;
+#[cfg(apple)]
+pub use fcntl_apple::*;
+#[cfg(apple)]
+pub use fcopyfile::*;
+pub use fd::*;
+#[cfg(all(apple, feature = "alloc"))]
+pub use getpath::getpath;
+#[cfg(not(target_os = "wasi"))]
+pub use id::*;
+#[cfg(linux_kernel)]
+pub use ioctl::*;
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+pub use makedev::*;
+#[cfg(any(linux_kernel, target_os = "freebsd"))]
+pub use memfd_create::memfd_create;
+#[cfg(linux_kernel)]
+#[cfg(feature = "fs")]
+pub use mount::*;
+#[cfg(linux_kernel)]
+pub use openat2::openat2;
+#[cfg(linux_kernel)]
+pub use raw_dir::{RawDir, RawDirEntry};
+pub use seek_from::SeekFrom;
+#[cfg(target_os = "linux")]
+pub use sendfile::sendfile;
+#[cfg(linux_kernel)]
+pub use statx::statx;
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+pub use sync::sync;
+#[cfg(any(apple, linux_kernel))]
+pub use xattr::*;
+
+/// Re-export types common to POSIX-ish platforms.
+#[cfg(feature = "std")]
+#[cfg(unix)]
+pub use std::os::unix::fs::{DirEntryExt, FileExt, FileTypeExt, MetadataExt, OpenOptionsExt};
+#[cfg(feature = "std")]
+#[cfg(all(wasi_ext, target_os = "wasi"))]
+pub use std::os::wasi::fs::{DirEntryExt, FileExt, FileTypeExt, MetadataExt, OpenOptionsExt};
diff --git a/vendor/rustix/src/fs/mount.rs b/vendor/rustix/src/fs/mount.rs
new file mode 100644
index 0000000..bd44aaa
--- /dev/null
+++ b/vendor/rustix/src/fs/mount.rs
@@ -0,0 +1,55 @@
+//! Linux `mount`.
+//!
+//! These have been moved to a new `rustix::mount` module.
+
+#[deprecated(note = "`rustix::fs::UnmountFlags` moved to `rustix::mount::UnmountFlags`.")]
+#[doc(hidden)]
+pub use crate::mount::UnmountFlags;
+
+#[deprecated(note = "`rustix::fs::MountFlags` moved to `rustix::mount::MountFlags`.")]
+#[doc(hidden)]
+pub use crate::mount::MountFlags;
+
+#[deprecated(
+    note = "`rustix::fs::MountPropagationFlags` moved to `rustix::mount::MountPropagationFlags`."
+)]
+#[doc(hidden)]
+pub use crate::mount::MountPropagationFlags;
+
+#[deprecated(note = "`rustix::fs::mount` moved to `rustix::mount::mount`.")]
+#[doc(hidden)]
+pub use crate::mount::mount;
+
+#[deprecated(note = "`rustix::fs::unmount` moved to `rustix::mount::unmount`.")]
+#[doc(hidden)]
+pub use crate::mount::unmount;
+
+#[deprecated(
+    note = "`rustix::fs::remount` is renamed and moved to `rustix::mount::mount_remount`."
+)]
+#[doc(hidden)]
+pub use crate::mount::mount_remount as remount;
+
+#[deprecated(
+    note = "`rustix::fs::bind_mount` is renamed and moved to `rustix::mount::mount_bind`."
+)]
+#[doc(hidden)]
+pub use crate::mount::mount_bind as bind_mount;
+
+#[deprecated(
+    note = "`rustix::fs::recursive_bind_mount` is renamed and moved to `rustix::mount::mount_recursive_bind`."
+)]
+#[doc(hidden)]
+pub use crate::mount::mount_recursive_bind as recursive_bind_mount;
+
+#[deprecated(
+    note = "`rustix::fs::change_mount` is renamed and moved to `rustix::mount::mount_change`."
+)]
+#[doc(hidden)]
+pub use crate::mount::mount_change as change_mount;
+
+#[deprecated(
+    note = "`rustix::fs::move_mount` is renamed and moved to `rustix::mount::mount_move`."
+)]
+#[doc(hidden)]
+pub use crate::mount::mount_move as move_mount;
diff --git a/vendor/rustix/src/fs/openat2.rs b/vendor/rustix/src/fs/openat2.rs
new file mode 100644
index 0000000..4918e00
--- /dev/null
+++ b/vendor/rustix/src/fs/openat2.rs
@@ -0,0 +1,23 @@
+use crate::fd::OwnedFd;
+use crate::{backend, io, path};
+use backend::fd::AsFd;
+use backend::fs::types::{Mode, OFlags, ResolveFlags};
+
+/// `openat2(dirfd, path, OpenHow { oflags, mode, resolve }, sizeof(OpenHow))`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/openat2.2.html
+#[inline]
+pub fn openat2<Fd: AsFd, P: path::Arg>(
+    dirfd: Fd,
+    path: P,
+    oflags: OFlags,
+    mode: Mode,
+    resolve: ResolveFlags,
+) -> io::Result<OwnedFd> {
+    path.into_with_c_str(|path| {
+        backend::fs::syscalls::openat2(dirfd.as_fd(), path, oflags, mode, resolve)
+    })
+}
diff --git a/vendor/rustix/src/fs/raw_dir.rs b/vendor/rustix/src/fs/raw_dir.rs
new file mode 100644
index 0000000..93686b1
--- /dev/null
+++ b/vendor/rustix/src/fs/raw_dir.rs
@@ -0,0 +1,237 @@
+//! `RawDir` and `RawDirEntry`.
+
+use core::fmt;
+use core::mem::{align_of, MaybeUninit};
+use linux_raw_sys::general::linux_dirent64;
+
+use crate::backend::fs::syscalls::getdents_uninit;
+use crate::fd::AsFd;
+use crate::ffi::CStr;
+use crate::fs::FileType;
+use crate::io;
+
+/// A directory iterator implemented with getdents.
+///
+/// Note: This implementation does not handle growing the buffer. If this
+/// functionality is necessary, you'll need to drop the current iterator,
+/// resize the buffer, and then re-create the iterator. The iterator is
+/// guaranteed to continue where it left off provided the file descriptor isn't
+/// changed. See the example in [`RawDir::new`].
+pub struct RawDir<'buf, Fd: AsFd> {
+    fd: Fd,
+    buf: &'buf mut [MaybeUninit<u8>],
+    initialized: usize,
+    offset: usize,
+}
+
+impl<'buf, Fd: AsFd> RawDir<'buf, Fd> {
+    /// Create a new iterator from the given file descriptor and buffer.
+    ///
+    /// Note: the buffer size may be trimmed to accommodate alignment
+    /// requirements.
+    ///
+    /// # Examples
+    ///
+    /// ## Simple but non-portable
+    ///
+    /// These examples are non-portable, because file systems may not have a
+    /// maximum file name length. If you can make assumptions that bound
+    /// this length, then these examples may suffice.
+    ///
+    /// Using the heap:
+    ///
+    /// ```
+    /// # use std::mem::MaybeUninit;
+    /// # use rustix::fs::{CWD, Mode, OFlags, openat, RawDir};
+    /// # use rustix::cstr;
+    ///
+    /// let fd = openat(
+    ///     CWD,
+    ///     cstr!("."),
+    ///     OFlags::RDONLY | OFlags::DIRECTORY | OFlags::CLOEXEC,
+    ///     Mode::empty(),
+    /// )
+    /// .unwrap();
+    ///
+    /// let mut buf = Vec::with_capacity(8192);
+    /// let mut iter = RawDir::new(fd, buf.spare_capacity_mut());
+    /// while let Some(entry) = iter.next() {
+    ///     let entry = entry.unwrap();
+    ///     dbg!(&entry);
+    /// }
+    /// ```
+    ///
+    /// Using the stack:
+    ///
+    /// ```
+    /// # use std::mem::MaybeUninit;
+    /// # use rustix::fs::{CWD, Mode, OFlags, openat, RawDir};
+    /// # use rustix::cstr;
+    ///
+    /// let fd = openat(
+    ///     CWD,
+    ///     cstr!("."),
+    ///     OFlags::RDONLY | OFlags::DIRECTORY | OFlags::CLOEXEC,
+    ///     Mode::empty(),
+    /// )
+    /// .unwrap();
+    ///
+    /// let mut buf = [MaybeUninit::uninit(); 2048];
+    /// let mut iter = RawDir::new(fd, &mut buf);
+    /// while let Some(entry) = iter.next() {
+    ///     let entry = entry.unwrap();
+    ///     dbg!(&entry);
+    /// }
+    /// ```
+    ///
+    /// ## Portable
+    ///
+    /// Heap allocated growing buffer for supporting directory entries with
+    /// arbitrarily large file names:
+    ///
+    /// ```notrust
+    /// # // The `notrust` above can be removed when we can depend on Rust 1.65.
+    /// # use std::mem::MaybeUninit;
+    /// # use rustix::fs::{CWD, Mode, OFlags, openat, RawDir};
+    /// # use rustix::io::Errno;
+    /// # use rustix::cstr;
+    ///
+    /// let fd = openat(
+    ///     CWD,
+    ///     cstr!("."),
+    ///     OFlags::RDONLY | OFlags::DIRECTORY | OFlags::CLOEXEC,
+    ///     Mode::empty(),
+    /// )
+    /// .unwrap();
+    ///
+    /// let mut buf = Vec::with_capacity(8192);
+    /// 'read: loop {
+    ///     'resize: {
+    ///         let mut iter = RawDir::new(&fd, buf.spare_capacity_mut());
+    ///         while let Some(entry) = iter.next() {
+    ///             let entry = match entry {
+    ///                 Err(Errno::INVAL) => break 'resize,
+    ///                 r => r.unwrap(),
+    ///             };
+    ///             dbg!(&entry);
+    ///         }
+    ///         break 'read;
+    ///     }
+    ///
+    ///     let new_capacity = buf.capacity() * 2;
+    ///     buf.reserve(new_capacity);
+    /// }
+    /// ```
+    pub fn new(fd: Fd, buf: &'buf mut [MaybeUninit<u8>]) -> Self {
+        Self {
+            fd,
+            buf: {
+                let offset = buf.as_ptr().align_offset(align_of::<linux_dirent64>());
+                if offset < buf.len() {
+                    &mut buf[offset..]
+                } else {
+                    &mut []
+                }
+            },
+            initialized: 0,
+            offset: 0,
+        }
+    }
+}
+
+/// A raw directory entry, similar to [`std::fs::DirEntry`].
+///
+/// Unlike the std version, this may represent the `.` or `..` entries.
+pub struct RawDirEntry<'a> {
+    file_name: &'a CStr,
+    file_type: u8,
+    inode_number: u64,
+    next_entry_cookie: i64,
+}
+
+impl<'a> fmt::Debug for RawDirEntry<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let mut f = f.debug_struct("RawDirEntry");
+        f.field("file_name", &self.file_name());
+        f.field("file_type", &self.file_type());
+        f.field("ino", &self.ino());
+        f.field("next_entry_cookie", &self.next_entry_cookie());
+        f.finish()
+    }
+}
+
+impl<'a> RawDirEntry<'a> {
+    /// Returns the file name of this directory entry.
+    #[inline]
+    pub fn file_name(&self) -> &CStr {
+        self.file_name
+    }
+
+    /// Returns the type of this directory entry.
+    #[inline]
+    pub fn file_type(&self) -> FileType {
+        FileType::from_dirent_d_type(self.file_type)
+    }
+
+    /// Returns the inode number of this directory entry.
+    #[inline]
+    #[doc(alias = "inode_number")]
+    pub fn ino(&self) -> u64 {
+        self.inode_number
+    }
+
+    /// Returns the seek cookie to the next directory entry.
+    #[inline]
+    #[doc(alias = "off")]
+    pub fn next_entry_cookie(&self) -> u64 {
+        self.next_entry_cookie as u64
+    }
+}
+
+impl<'buf, Fd: AsFd> RawDir<'buf, Fd> {
+    /// Identical to [`Iterator::next`] except that [`Iterator::Item`] borrows
+    /// from self.
+    ///
+    /// Note: this interface will be broken to implement a stdlib iterator API
+    /// with GAT support once one becomes available.
+    #[allow(unsafe_code)]
+    #[allow(clippy::should_implement_trait)]
+    pub fn next(&mut self) -> Option<io::Result<RawDirEntry<'_>>> {
+        if self.is_buffer_empty() {
+            match getdents_uninit(self.fd.as_fd(), self.buf) {
+                Ok(0) => return None,
+                Ok(bytes_read) => {
+                    self.initialized = bytes_read;
+                    self.offset = 0;
+                }
+                Err(e) => return Some(Err(e)),
+            }
+        }
+
+        let dirent_ptr = self.buf[self.offset..].as_ptr();
+        // SAFETY:
+        // - This data is initialized by the check above.
+        //   - Assumption: the kernel will not give us partial structs.
+        // - Assumption: the kernel uses proper alignment between structs.
+        // - The starting pointer is aligned (performed in RawDir::new)
+        let dirent = unsafe { &*dirent_ptr.cast::<linux_dirent64>() };
+
+        self.offset += usize::from(dirent.d_reclen);
+
+        Some(Ok(RawDirEntry {
+            file_type: dirent.d_type,
+            inode_number: dirent.d_ino.into(),
+            next_entry_cookie: dirent.d_off.into(),
+            // SAFETY: The kernel guarantees a NUL-terminated string.
+            file_name: unsafe { CStr::from_ptr(dirent.d_name.as_ptr().cast()) },
+        }))
+    }
+
+    /// Returns true if the internal buffer is empty and will be refilled when
+    /// calling [`next`].
+    ///
+    /// [`next`]: Self::next
+    pub fn is_buffer_empty(&self) -> bool {
+        self.offset >= self.initialized
+    }
+}
diff --git a/vendor/rustix/src/fs/seek_from.rs b/vendor/rustix/src/fs/seek_from.rs
new file mode 100644
index 0000000..c08abd2
--- /dev/null
+++ b/vendor/rustix/src/fs/seek_from.rs
@@ -0,0 +1,53 @@
+//! The following is derived from Rust's
+//! library/std/src/io/mod.rs at revision
+//! dca3f1b786efd27be3b325ed1e01e247aa589c3b.
+
+/// Enumeration of possible methods to seek within an I/O object.
+///
+/// It is used by the [`seek`] function.
+///
+/// This is similar to [`std::io::SeekFrom`], however it adds platform-specific
+/// seek options.
+///
+/// [`seek`]: crate::fs::seek
+#[derive(Copy, PartialEq, Eq, Clone, Debug)]
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub enum SeekFrom {
+    /// Sets the offset to the provided number of bytes.
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    Start(#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))] u64),
+
+    /// Sets the offset to the size of this object plus the specified number of
+    /// bytes.
+    ///
+    /// It is possible to seek beyond the end of an object, but it's an error
+    /// to seek before byte 0.
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    End(#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))] i64),
+
+    /// Sets the offset to the current position plus the specified number of
+    /// bytes.
+    ///
+    /// It is possible to seek beyond the end of an object, but it's an error
+    /// to seek before byte 0.
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    Current(#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))] i64),
+
+    /// Sets the offset to the current position plus the specified number of
+    /// bytes, plus the distance to the next byte which is not in a hole.
+    ///
+    /// If the offset is in a hole at the end of the file, the seek will fail
+    /// with [`Errno::NXIO`].
+    ///
+    /// [`Errno::NXIO`]: crate::io::Errno::NXIO
+    #[cfg(any(apple, freebsdlike, linux_kernel, solarish))]
+    Data(i64),
+
+    /// Sets the offset to the current position plus the specified number of
+    /// bytes, plus the distance to the next byte which is in a hole.
+    ///
+    /// If there is no hole past the offset, it will be set to the end of the
+    /// file i.e. there is an implicit hole at the end of any file.
+    #[cfg(any(apple, freebsdlike, linux_kernel, solarish))]
+    Hole(i64),
+}
diff --git a/vendor/rustix/src/fs/sendfile.rs b/vendor/rustix/src/fs/sendfile.rs
new file mode 100644
index 0000000..7f5c848
--- /dev/null
+++ b/vendor/rustix/src/fs/sendfile.rs
@@ -0,0 +1,19 @@
+use crate::{backend, io};
+use backend::fd::AsFd;
+
+/// `sendfile(out_fd, in_fd, offset, count)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/sendfile.2.html
+#[cfg(linux_kernel)]
+#[inline]
+pub fn sendfile<OutFd: AsFd, InFd: AsFd>(
+    out_fd: OutFd,
+    in_fd: InFd,
+    offset: Option<&mut u64>,
+    count: usize,
+) -> io::Result<usize> {
+    backend::fs::syscalls::sendfile(out_fd.as_fd(), in_fd.as_fd(), offset, count)
+}
diff --git a/vendor/rustix/src/fs/statx.rs b/vendor/rustix/src/fs/statx.rs
new file mode 100644
index 0000000..b7d6787
--- /dev/null
+++ b/vendor/rustix/src/fs/statx.rs
@@ -0,0 +1,135 @@
+//! Linux `statx`.
+
+use crate::fd::AsFd;
+use crate::fs::AtFlags;
+use crate::{backend, io, path};
+use backend::fs::types::{Statx, StatxFlags};
+
+#[cfg(feature = "linux_4_11")]
+use backend::fs::syscalls::statx as _statx;
+#[cfg(not(feature = "linux_4_11"))]
+use compat::statx as _statx;
+
+/// `statx(dirfd, path, flags, mask, statxbuf)`
+///
+/// This function returns [`io::Errno::NOSYS`] if `statx` is not available on
+/// the platform, such as Linux before 4.11. This also includes older Docker
+/// versions where the actual syscall fails with different error codes; rustix
+/// handles this and translates them into `NOSYS`.
+///
+/// # References
+///  - [Linux]
+///
+/// # Examples
+///
+/// ```
+/// # use std::path::Path;
+/// # use std::io;
+/// # use rustix::fs::{AtFlags, StatxFlags};
+/// # use rustix::fd::BorrowedFd;
+/// /// Try to determine if the provided path is a mount root. Will return
+/// /// `Ok(None)` if the kernel is not new enough to support `statx` or
+/// /// [`libc::STATX_ATTR_MOUNT_ROOT`].
+/// fn is_mountpoint(root: BorrowedFd<'_>, path: &Path) -> io::Result<Option<bool>> {
+///     use rustix::fs::{AtFlags, StatxFlags};
+///
+///     let mountroot_flag = libc::STATX_ATTR_MOUNT_ROOT as u64;
+///     match rustix::fs::statx(
+///         root,
+///         path,
+///         AtFlags::NO_AUTOMOUNT | AtFlags::SYMLINK_NOFOLLOW,
+///         StatxFlags::empty(),
+///     ) {
+///         Ok(r) => {
+///             let present = (r.stx_attributes_mask & mountroot_flag) > 0;
+///             Ok(present.then(|| r.stx_attributes & mountroot_flag > 0))
+///         }
+///         Err(e) if e == rustix::io::Errno::NOSYS => Ok(None),
+///         Err(e) => Err(e.into()),
+///     }
+/// }
+/// ```
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/statx.2.html
+#[inline]
+pub fn statx<P: path::Arg, Fd: AsFd>(
+    dirfd: Fd,
+    path: P,
+    flags: AtFlags,
+    mask: StatxFlags,
+) -> io::Result<Statx> {
+    path.into_with_c_str(|path| _statx(dirfd.as_fd(), path, flags, mask))
+}
+
+#[cfg(not(feature = "linux_4_11"))]
+mod compat {
+    use crate::fd::BorrowedFd;
+    use crate::ffi::CStr;
+    use crate::fs::AtFlags;
+    use crate::{backend, io};
+    use core::sync::atomic::{AtomicU8, Ordering};
+
+    use backend::fs::types::{Statx, StatxFlags};
+
+    // Linux kernel prior to 4.11 and old versions of Docker don't support
+    // `statx`. We store the availability in a global to avoid unnecessary
+    // syscalls.
+    //
+    // 0: Unknown
+    // 1: Not available
+    // 2: Available
+    static STATX_STATE: AtomicU8 = AtomicU8::new(0);
+
+    #[inline]
+    pub fn statx(
+        dirfd: BorrowedFd<'_>,
+        path: &CStr,
+        flags: AtFlags,
+        mask: StatxFlags,
+    ) -> io::Result<Statx> {
+        match STATX_STATE.load(Ordering::Relaxed) {
+            0 => statx_init(dirfd, path, flags, mask),
+            1 => Err(io::Errno::NOSYS),
+            _ => backend::fs::syscalls::statx(dirfd, path, flags, mask),
+        }
+    }
+
+    /// The first `statx` call. We don't know if `statx` is available yet.
+    fn statx_init(
+        dirfd: BorrowedFd<'_>,
+        path: &CStr,
+        flags: AtFlags,
+        mask: StatxFlags,
+    ) -> io::Result<Statx> {
+        match backend::fs::syscalls::statx(dirfd, path, flags, mask) {
+            Err(io::Errno::NOSYS) => statx_error_nosys(),
+            Err(io::Errno::PERM) => statx_error_perm(),
+            result => {
+                STATX_STATE.store(2, Ordering::Relaxed);
+                result
+            }
+        }
+    }
+
+    /// The first `statx` call failed with `NOSYS` (or something we're treating
+    /// like `NOSYS`).
+    #[cold]
+    fn statx_error_nosys() -> io::Result<Statx> {
+        STATX_STATE.store(1, Ordering::Relaxed);
+        Err(io::Errno::NOSYS)
+    }
+
+    /// The first `statx` call failed with `PERM`.
+    #[cold]
+    fn statx_error_perm() -> io::Result<Statx> {
+        // Some old versions of Docker have `statx` fail with `PERM` when it
+        // isn't recognized. Check whether `statx` really is available, and if
+        // so, fail with `PERM`, and if not, treat it like `NOSYS`.
+        if backend::fs::syscalls::is_statx_available() {
+            STATX_STATE.store(2, Ordering::Relaxed);
+            Err(io::Errno::PERM)
+        } else {
+            statx_error_nosys()
+        }
+    }
+}
diff --git a/vendor/rustix/src/fs/sync.rs b/vendor/rustix/src/fs/sync.rs
new file mode 100644
index 0000000..3d2d089
--- /dev/null
+++ b/vendor/rustix/src/fs/sync.rs
@@ -0,0 +1,14 @@
+use crate::backend;
+
+/// `sync`—Flush cached filesystem data for all filesystems.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sync.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/sync.2.html
+#[inline]
+pub fn sync() {
+    backend::fs::syscalls::sync();
+}
diff --git a/vendor/rustix/src/fs/xattr.rs b/vendor/rustix/src/fs/xattr.rs
new file mode 100644
index 0000000..d5be7a3
--- /dev/null
+++ b/vendor/rustix/src/fs/xattr.rs
@@ -0,0 +1,202 @@
+use crate::{backend, io, path};
+use backend::c;
+use backend::fd::AsFd;
+use bitflags::bitflags;
+
+bitflags! {
+    /// `XATTR_*` constants for use with [`setxattr`], and other `*setxattr`
+    /// functions.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct XattrFlags: c::c_uint {
+        /// `XATTR_CREATE`
+        const CREATE = c::XATTR_CREATE as c::c_uint;
+
+        /// `XATTR_REPLACE`
+        const REPLACE = c::XATTR_REPLACE as c::c_uint;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `getxattr(path, name, value.as_ptr(), value.len())`—Get extended
+/// filesystem attributes.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/getxattr.2.html
+#[inline]
+pub fn getxattr<P: path::Arg, Name: path::Arg>(
+    path: P,
+    name: Name,
+    value: &mut [u8],
+) -> io::Result<usize> {
+    path.into_with_c_str(|path| {
+        name.into_with_c_str(|name| backend::fs::syscalls::getxattr(path, name, value))
+    })
+}
+
+/// `lgetxattr(path, name, value.as_ptr(), value.len())`—Get extended
+/// filesystem attributes, without following symlinks in the last path
+/// component.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/lgetxattr.2.html
+#[inline]
+pub fn lgetxattr<P: path::Arg, Name: path::Arg>(
+    path: P,
+    name: Name,
+    value: &mut [u8],
+) -> io::Result<usize> {
+    path.into_with_c_str(|path| {
+        name.into_with_c_str(|name| backend::fs::syscalls::lgetxattr(path, name, value))
+    })
+}
+
+/// `fgetxattr(fd, name, value.as_ptr(), value.len())`—Get extended
+/// filesystem attributes on an open file descriptor.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/fgetxattr.2.html
+#[inline]
+pub fn fgetxattr<Fd: AsFd, Name: path::Arg>(
+    fd: Fd,
+    name: Name,
+    value: &mut [u8],
+) -> io::Result<usize> {
+    name.into_with_c_str(|name| backend::fs::syscalls::fgetxattr(fd.as_fd(), name, value))
+}
+
+/// `setxattr(path, name, value.as_ptr(), value.len(), flags)`—Set extended
+/// filesystem attributes.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/setxattr.2.html
+#[inline]
+pub fn setxattr<P: path::Arg, Name: path::Arg>(
+    path: P,
+    name: Name,
+    value: &[u8],
+    flags: XattrFlags,
+) -> io::Result<()> {
+    path.into_with_c_str(|path| {
+        name.into_with_c_str(|name| backend::fs::syscalls::setxattr(path, name, value, flags))
+    })
+}
+
+/// `setxattr(path, name, value.as_ptr(), value.len(), flags)`—Set extended
+/// filesystem attributes, without following symlinks in the last path
+/// component.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/lsetxattr.2.html
+#[inline]
+pub fn lsetxattr<P: path::Arg, Name: path::Arg>(
+    path: P,
+    name: Name,
+    value: &[u8],
+    flags: XattrFlags,
+) -> io::Result<()> {
+    path.into_with_c_str(|path| {
+        name.into_with_c_str(|name| backend::fs::syscalls::lsetxattr(path, name, value, flags))
+    })
+}
+
+/// `fsetxattr(fd, name, value.as_ptr(), value.len(), flags)`—Set extended
+/// filesystem attributes on an open file descriptor.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/fsetxattr.2.html
+#[inline]
+pub fn fsetxattr<Fd: AsFd, Name: path::Arg>(
+    fd: Fd,
+    name: Name,
+    value: &[u8],
+    flags: XattrFlags,
+) -> io::Result<()> {
+    name.into_with_c_str(|name| backend::fs::syscalls::fsetxattr(fd.as_fd(), name, value, flags))
+}
+
+/// `listxattr(path, list.as_ptr(), list.len())`—List extended filesystem
+/// attributes.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/listxattr.2.html
+#[inline]
+pub fn listxattr<P: path::Arg>(path: P, list: &mut [c::c_char]) -> io::Result<usize> {
+    path.into_with_c_str(|path| backend::fs::syscalls::listxattr(path, list))
+}
+
+/// `llistxattr(path, list.as_ptr(), list.len())`—List extended filesystem
+/// attributes, without following symlinks in the last path component.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/llistxattr.2.html
+#[inline]
+pub fn llistxattr<P: path::Arg>(path: P, list: &mut [c::c_char]) -> io::Result<usize> {
+    path.into_with_c_str(|path| backend::fs::syscalls::llistxattr(path, list))
+}
+
+/// `flistxattr(fd, list.as_ptr(), list.len())`—List extended filesystem
+/// attributes on an open file descriptor.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/flistxattr.2.html
+#[inline]
+pub fn flistxattr<Fd: AsFd>(fd: Fd, list: &mut [c::c_char]) -> io::Result<usize> {
+    backend::fs::syscalls::flistxattr(fd.as_fd(), list)
+}
+
+/// `removexattr(path, name)`—Remove an extended filesystem attribute.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/removexattr.2.html
+pub fn removexattr<P: path::Arg, Name: path::Arg>(path: P, name: Name) -> io::Result<()> {
+    path.into_with_c_str(|path| {
+        name.into_with_c_str(|name| backend::fs::syscalls::removexattr(path, name))
+    })
+}
+
+/// `lremovexattr(path, name)`—Remove an extended filesystem attribute,
+/// without following symlinks in the last path component.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/lremovexattr.2.html
+pub fn lremovexattr<P: path::Arg, Name: path::Arg>(path: P, name: Name) -> io::Result<()> {
+    path.into_with_c_str(|path| {
+        name.into_with_c_str(|name| backend::fs::syscalls::lremovexattr(path, name))
+    })
+}
+
+/// `fremovexattr(fd, name)`—Remove an extended filesystem attribute on an
+/// open file descriptor.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/fremovexattr.2.html
+pub fn fremovexattr<Fd: AsFd, Name: path::Arg>(fd: Fd, name: Name) -> io::Result<()> {
+    name.into_with_c_str(|name| backend::fs::syscalls::fremovexattr(fd.as_fd(), name))
+}
diff --git a/vendor/rustix/src/io/close.rs b/vendor/rustix/src/io/close.rs
new file mode 100644
index 0000000..474d252
--- /dev/null
+++ b/vendor/rustix/src/io/close.rs
@@ -0,0 +1,55 @@
+//! The unsafe `close` for raw file descriptors.
+//!
+//! # Safety
+//!
+//! Operating on raw file descriptors is unsafe.
+#![allow(unsafe_code)]
+
+use crate::backend;
+use backend::fd::RawFd;
+
+/// `close(raw_fd)`—Closes a `RawFd` directly.
+///
+/// Most users won't need to use this, as `OwnedFd` automatically closes its
+/// file descriptor on `Drop`.
+///
+/// This function does not return a `Result`, as it is the [responsibility] of
+/// filesystem designers to not return errors from `close`. Users who chose to
+/// use NFS or similar filesystems should take care to monitor for problems
+/// externally.
+///
+/// [responsibility]: https://lwn.net/Articles/576518/
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#close-and-shutdownget-outta-my-face
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/close.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/close.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/close.2.html#//apple_ref/doc/man/2/close
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-closesocket
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=close&sektion=2
+/// [NetBSD]: https://man.netbsd.org/close.2
+/// [OpenBSD]: https://man.openbsd.org/close.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=close&section=2
+/// [illumos]: https://illumos.org/man/2/close
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Opening-and-Closing-Files.html#index-close
+///
+/// # Safety
+///
+/// This function takes a `RawFd`, which must be valid before the call, and is
+/// not valid after the call.
+#[inline]
+pub unsafe fn close(raw_fd: RawFd) {
+    backend::io::syscalls::close(raw_fd)
+}
diff --git a/vendor/rustix/src/io/dup.rs b/vendor/rustix/src/io/dup.rs
new file mode 100644
index 0000000..46fb38a
--- /dev/null
+++ b/vendor/rustix/src/io/dup.rs
@@ -0,0 +1,124 @@
+//! Functions which duplicate file descriptors.
+
+use crate::fd::OwnedFd;
+use crate::{backend, io};
+use backend::fd::AsFd;
+
+#[cfg(not(target_os = "wasi"))]
+pub use backend::io::types::DupFlags;
+
+/// `dup(fd)`—Creates a new `OwnedFd` instance that shares the same
+/// underlying [file description] as `fd`.
+///
+/// This function does not set the `O_CLOEXEC` flag. To do a `dup` that does
+/// set `O_CLOEXEC`, use [`fcntl_dupfd_cloexec`].
+///
+/// POSIX guarantees that `dup` will use the lowest unused file descriptor,
+/// however it is not safe in general to rely on this, as file descriptors may
+/// be unexpectedly allocated on other threads or in libraries.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [file description]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_258
+/// [`fcntl_dupfd_cloexec`]: crate::io::fcntl_dupfd_cloexec
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/dup.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/dup.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/dup.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=dup&sektion=2
+/// [NetBSD]: https://man.netbsd.org/dup.2
+/// [OpenBSD]: https://man.openbsd.org/dup.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=dup&section=2
+/// [illumos]: https://illumos.org/man/2/dup
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Duplicating-Descriptors.html
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub fn dup<Fd: AsFd>(fd: Fd) -> io::Result<OwnedFd> {
+    backend::io::syscalls::dup(fd.as_fd())
+}
+
+/// `dup2(fd, new)`—Changes the [file description] of a file descriptor.
+///
+/// `dup2` conceptually closes `new` and then sets the file description for
+/// `new` to be the same as the one for `fd`. This is a very unusual operation,
+/// and should only be used on file descriptors where you know how `new` will
+/// be subsequently used.
+///
+/// This function does not set the `O_CLOEXEC` flag. To do a `dup2` that does
+/// set `O_CLOEXEC`, use [`dup3`] with [`DupFlags::CLOEXEC`] on platforms which
+/// support it, or [`fcntl_dupfd_cloexec`]
+///
+/// For `dup2` to stdin, stdout, and stderr, see [`stdio::dup2_stdin`],
+/// [`stdio::dup2_stdout`], and [`stdio::dup2_stderr`].
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [file description]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_258
+/// [`fcntl_dupfd_cloexec`]: crate::io::fcntl_dupfd_cloexec
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/dup2.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/dup2.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/dup2.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=dup2&sektion=2
+/// [NetBSD]: https://man.netbsd.org/dup2.2
+/// [OpenBSD]: https://man.openbsd.org/dup2.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=dup2&section=2
+/// [illumos]: https://illumos.org/man/2/dup
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Duplicating-Descriptors.html
+/// [`stdio::dup2_stdin`]: https://docs.rs/rustix/*/rustix/stdio/fn.dup2_stdin.html
+/// [`stdio::dup2_stdout`]: https://docs.rs/rustix/*/rustix/stdio/fn.dup2_stdout.html
+/// [`stdio::dup2_stderr`]: https://docs.rs/rustix/*/rustix/stdio/fn.dup2_stderr.html
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub fn dup2<Fd: AsFd>(fd: Fd, new: &mut OwnedFd) -> io::Result<()> {
+    backend::io::syscalls::dup2(fd.as_fd(), new)
+}
+
+/// `dup3(fd, new, flags)`—Changes the [file description] of a file
+/// descriptor, with flags.
+///
+/// `dup3` is the same as [`dup2`] but adds an additional flags operand, and it
+/// fails in the case that `fd` and `new` have the same file descriptor value.
+/// This additional difference is the reason this function isn't named
+/// `dup2_with`.
+///
+/// # References
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///
+/// [file description]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_258
+/// [Linux]: https://man7.org/linux/man-pages/man2/dup3.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=dup3&sektion=3
+/// [NetBSD]: https://man.netbsd.org/dup3.2
+/// [OpenBSD]: https://man.openbsd.org/dup3.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=dup3&section=3
+#[cfg(not(any(
+    target_os = "aix",
+    target_os = "espidf",
+    target_os = "nto",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+pub fn dup3<Fd: AsFd>(fd: Fd, new: &mut OwnedFd, flags: DupFlags) -> io::Result<()> {
+    backend::io::syscalls::dup3(fd.as_fd(), new, flags)
+}
diff --git a/vendor/rustix/src/io/errno.rs b/vendor/rustix/src/io/errno.rs
new file mode 100644
index 0000000..2b72de0
--- /dev/null
+++ b/vendor/rustix/src/io/errno.rs
@@ -0,0 +1,72 @@
+//! The `Errno` type, which is a minimal wrapper around an error code.
+//!
+//! We define the error constants as individual `const`s instead of an enum
+//! because we may not know about all of the host's error values and we don't
+//! want unrecognized values to create undefined behavior.
+
+use crate::backend;
+use core::{fmt, result};
+#[cfg(feature = "std")]
+use std::error;
+
+/// A specialized [`Result`] type for `rustix` APIs.
+pub type Result<T> = result::Result<T, Errno>;
+
+pub use backend::io::errno::Errno;
+
+impl Errno {
+    /// Shorthand for `std::io::Error::from(self).kind()`.
+    #[cfg(feature = "std")]
+    #[inline]
+    pub fn kind(self) -> std::io::ErrorKind {
+        std::io::Error::from(self).kind()
+    }
+}
+
+impl fmt::Display for Errno {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        #[cfg(feature = "std")]
+        {
+            std::io::Error::from(*self).fmt(fmt)
+        }
+        #[cfg(not(feature = "std"))]
+        {
+            write!(fmt, "os error {}", self.raw_os_error())
+        }
+    }
+}
+
+impl fmt::Debug for Errno {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        #[cfg(feature = "std")]
+        {
+            std::io::Error::from(*self).fmt(fmt)
+        }
+        #[cfg(not(feature = "std"))]
+        {
+            write!(fmt, "os error {}", self.raw_os_error())
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+impl error::Error for Errno {}
+
+#[cfg(feature = "std")]
+impl From<Errno> for std::io::Error {
+    #[inline]
+    fn from(err: Errno) -> Self {
+        Self::from_raw_os_error(err.raw_os_error() as _)
+    }
+}
+
+/// Call `f` until it either succeeds or fails other than [`Errno::INTR`].
+#[inline]
+pub fn retry_on_intr<T, F: FnMut() -> Result<T>>(mut f: F) -> Result<T> {
+    loop {
+        match f() {
+            Err(Errno::INTR) => (),
+            result => return result,
+        }
+    }
+}
diff --git a/vendor/rustix/src/io/fcntl.rs b/vendor/rustix/src/io/fcntl.rs
new file mode 100644
index 0000000..31eb84c
--- /dev/null
+++ b/vendor/rustix/src/io/fcntl.rs
@@ -0,0 +1,141 @@
+//! The Unix `fcntl` function is effectively lots of different functions hidden
+//! behind a single dynamic dispatch interface. In order to provide a type-safe
+//! API, rustix makes them all separate functions so that they can have
+//! dedicated static type signatures.
+//!
+//! `fcntl` functions which are not specific to files or directories live in
+//! the [`io`] module instead.
+//!
+//! [`io`]: crate::io
+
+use crate::{backend, io};
+use backend::fd::{AsFd, OwnedFd, RawFd};
+
+pub use backend::io::types::FdFlags;
+
+/// `fcntl(fd, F_GETFD)`—Returns a file descriptor's flags.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=fcntl&sektion=2
+/// [NetBSD]: https://man.netbsd.org/fcntl.2
+/// [OpenBSD]: https://man.openbsd.org/fcntl.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=fcntl&section=2
+/// [illumos]: https://illumos.org/man/2/fcntl
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Control-Operations.html#index-fcntl-function
+#[inline]
+#[doc(alias = "F_GETFD")]
+pub fn fcntl_getfd<Fd: AsFd>(fd: Fd) -> io::Result<FdFlags> {
+    backend::io::syscalls::fcntl_getfd(fd.as_fd())
+}
+
+/// `fcntl(fd, F_SETFD, flags)`—Sets a file descriptor's flags.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=fcntl&sektion=2
+/// [NetBSD]: https://man.netbsd.org/fcntl.2
+/// [OpenBSD]: https://man.openbsd.org/fcntl.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=fcntl&section=2
+/// [illumos]: https://illumos.org/man/2/fcntl
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Control-Operations.html#index-fcntl-function
+#[inline]
+#[doc(alias = "F_SETFD")]
+pub fn fcntl_setfd<Fd: AsFd>(fd: Fd, flags: FdFlags) -> io::Result<()> {
+    backend::io::syscalls::fcntl_setfd(fd.as_fd(), flags)
+}
+
+/// `fcntl(fd, F_DUPFD_CLOEXEC)`—Creates a new `OwnedFd` instance, with value
+/// at least `min`, that has `O_CLOEXEC` set and that shares the same
+/// underlying [file description] as `fd`.
+///
+/// POSIX guarantees that `F_DUPFD_CLOEXEC` will use the lowest unused file
+/// descriptor which is at least `min`, however it is not safe in general to
+/// rely on this, as file descriptors may be unexpectedly allocated on other
+/// threads or in libraries.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=fcntl&sektion=2
+/// [NetBSD]: https://man.netbsd.org/fcntl.2
+/// [OpenBSD]: https://man.openbsd.org/fcntl.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=fcntl&section=2
+/// [illumos]: https://illumos.org/man/2/fcntl
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Control-Operations.html#index-fcntl-function
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+#[inline]
+#[doc(alias = "F_DUPFD_CLOEXEC")]
+pub fn fcntl_dupfd_cloexec<Fd: AsFd>(fd: Fd, min: RawFd) -> io::Result<OwnedFd> {
+    backend::io::syscalls::fcntl_dupfd_cloexec(fd.as_fd(), min)
+}
+
+/// `fcntl(fd, F_DUPFD)`—Creates a new `OwnedFd` instance, with value at
+/// least `min`, that shares the same underlying [file description] as `fd`.
+///
+/// POSIX guarantees that `F_DUPFD` will use the lowest unused file descriptor
+/// which is at least `min`, however it is not safe in general to rely on this,
+/// as file descriptors may be unexpectedly allocated on other threads or in
+/// libraries.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=fcntl&sektion=2
+/// [NetBSD]: https://man.netbsd.org/fcntl.2
+/// [OpenBSD]: https://man.openbsd.org/fcntl.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=fcntl&section=2
+/// [illumos]: https://illumos.org/man/2/fcntl
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Control-Operations.html#index-fcntl-function
+#[cfg(target_os = "espidf")]
+#[inline]
+#[doc(alias = "F_DUPFD")]
+pub fn fcntl_dupfd<Fd: AsFd>(fd: Fd, min: RawFd) -> io::Result<OwnedFd> {
+    backend::io::syscalls::fcntl_dupfd(fd.as_fd(), min)
+}
diff --git a/vendor/rustix/src/io/ioctl.rs b/vendor/rustix/src/io/ioctl.rs
new file mode 100644
index 0000000..99dec06
--- /dev/null
+++ b/vendor/rustix/src/io/ioctl.rs
@@ -0,0 +1,77 @@
+//! The Unix `ioctl` function is effectively lots of different functions hidden
+//! behind a single dynamic dispatch interface. In order to provide a type-safe
+//! API, rustix makes them all separate functions so that they can have
+//! dedicated static type signatures.
+//!
+//! Some ioctls, such as those related to filesystems, terminals, and
+//! processes, live in other top-level API modules.
+
+#![allow(unsafe_code)]
+
+use crate::{backend, io, ioctl};
+use backend::c;
+use backend::fd::AsFd;
+
+/// `ioctl(fd, FIOCLEX, NULL)`—Set the close-on-exec flag.
+///
+/// This is similar to `fcntl(fd, F_SETFD, FD_CLOEXEC)`, except that it avoids
+/// clearing any other flags that might be set.
+#[cfg(apple)]
+#[inline]
+#[doc(alias = "FIOCLEX")]
+#[doc(alias = "FD_CLOEXEC")]
+pub fn ioctl_fioclex<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    // SAFETY: FIOCLEX is a no-argument setter opcode.
+    unsafe {
+        let ctl = ioctl::NoArg::<ioctl::BadOpcode<{ c::FIOCLEX }>>::new();
+        ioctl::ioctl(fd, ctl)
+    }
+}
+
+/// `ioctl(fd, FIONBIO, &value)`—Enables or disables non-blocking mode.
+///
+/// # References
+///  - [Winsock]
+///  - [NetBSD]
+///  - [OpenBSD]
+///
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/winsock/winsock-ioctls#unix-ioctl-codes
+/// [NetBSD]: https://man.netbsd.org/ioctl.2#GENERIC%20IOCTLS
+/// [OpenBSD]: https://man.openbsd.org/ioctl.2#GENERIC_IOCTLS
+#[inline]
+#[doc(alias = "FIONBIO")]
+pub fn ioctl_fionbio<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    // SAFETY: FIONBIO is a pointer setter opcode.
+    unsafe {
+        let ctl = ioctl::Setter::<ioctl::BadOpcode<{ c::FIONBIO }>, c::c_int>::new(value.into());
+        ioctl::ioctl(fd, ctl)
+    }
+}
+
+/// `ioctl(fd, FIONREAD)`—Returns the number of bytes ready to be read.
+///
+/// The result of this function gets silently coerced into a C `int` by the OS,
+/// so it may contain a wrapped value.
+///
+/// # References
+///  - [Linux]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/ioctl_tty.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/winsock/winsock-ioctls#unix-ioctl-codes
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=ioctl&sektion=2#GENERIC%09IOCTLS
+/// [NetBSD]: https://man.netbsd.org/ioctl.2#GENERIC%20IOCTLS
+/// [OpenBSD]: https://man.openbsd.org/ioctl.2#GENERIC_IOCTLS
+#[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+#[inline]
+#[doc(alias = "FIONREAD")]
+pub fn ioctl_fionread<Fd: AsFd>(fd: Fd) -> io::Result<u64> {
+    // SAFETY: FIONREAD is a getter opcode that gets a c_int.
+    unsafe {
+        let ctl = ioctl::Getter::<ioctl::BadOpcode<{ c::FIONREAD }>, c::c_int>::new();
+        ioctl::ioctl(fd, ctl).map(|n| n as u64)
+    }
+}
diff --git a/vendor/rustix/src/io/is_read_write.rs b/vendor/rustix/src/io/is_read_write.rs
new file mode 100644
index 0000000..af33806
--- /dev/null
+++ b/vendor/rustix/src/io/is_read_write.rs
@@ -0,0 +1,19 @@
+//! The [`is_read_write`] function.
+//!
+//! [`is_read_write`]: https://docs.rs/rustix/*/rustix/io/fn.is_read_write.html
+
+use crate::{backend, io};
+use backend::fd::AsFd;
+
+/// Returns a pair of booleans indicating whether the file descriptor is
+/// readable and/or writable, respectively.
+///
+/// Unlike [`is_file_read_write`], this correctly detects whether sockets
+/// have been shutdown, partially or completely.
+///
+/// [`is_file_read_write`]: crate::fs::is_file_read_write
+#[inline]
+#[cfg_attr(doc_cfg, doc(cfg(all(feature = "fs", feature = "net"))))]
+pub fn is_read_write<Fd: AsFd>(fd: Fd) -> io::Result<(bool, bool)> {
+    backend::io::syscalls::is_read_write(fd.as_fd())
+}
diff --git a/vendor/rustix/src/io/mod.rs b/vendor/rustix/src/io/mod.rs
new file mode 100644
index 0000000..bddd12a
--- /dev/null
+++ b/vendor/rustix/src/io/mod.rs
@@ -0,0 +1,32 @@
+//! I/O operations.
+//!
+//! If you're looking for [`SeekFrom`], that's in the [`fs`] module.
+//!
+//! [`SeekFrom`]: https://docs.rs/rustix/*/rustix/fs/enum.SeekFrom.html
+//! [`fs`]: https://docs.rs/rustix/*/rustix/fs/index.html
+
+mod close;
+#[cfg(not(windows))]
+mod dup;
+mod errno;
+#[cfg(not(windows))]
+mod fcntl;
+mod ioctl;
+#[cfg(not(any(windows, target_os = "redox")))]
+#[cfg(all(feature = "fs", feature = "net"))]
+mod is_read_write;
+#[cfg(not(windows))]
+mod read_write;
+
+pub use close::close;
+#[cfg(not(windows))]
+pub use dup::*;
+pub use errno::{retry_on_intr, Errno, Result};
+#[cfg(not(windows))]
+pub use fcntl::*;
+pub use ioctl::*;
+#[cfg(not(any(windows, target_os = "redox")))]
+#[cfg(all(feature = "fs", feature = "net"))]
+pub use is_read_write::*;
+#[cfg(not(windows))]
+pub use read_write::*;
diff --git a/vendor/rustix/src/io/read_write.rs b/vendor/rustix/src/io/read_write.rs
new file mode 100644
index 0000000..2ed9dd7
--- /dev/null
+++ b/vendor/rustix/src/io/read_write.rs
@@ -0,0 +1,312 @@
+//! `read` and `write`, optionally positioned, optionally vectored
+
+#![allow(unsafe_code)]
+
+use crate::buffer::split_init;
+use crate::{backend, io};
+use backend::fd::AsFd;
+use core::mem::MaybeUninit;
+
+// Declare `IoSlice` and `IoSliceMut`.
+#[cfg(not(windows))]
+pub use crate::maybe_polyfill::io::{IoSlice, IoSliceMut};
+
+#[cfg(linux_kernel)]
+pub use backend::io::types::ReadWriteFlags;
+
+/// `read(fd, buf)`—Reads from a stream.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/read.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/read.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/read.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=read&sektion=2
+/// [NetBSD]: https://man.netbsd.org/read.2
+/// [OpenBSD]: https://man.openbsd.org/read.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=read&section=2
+/// [illumos]: https://illumos.org/man/2/read
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/I_002fO-Primitives.html#index-reading-from-a-file-descriptor
+#[inline]
+pub fn read<Fd: AsFd>(fd: Fd, buf: &mut [u8]) -> io::Result<usize> {
+    unsafe { backend::io::syscalls::read(fd.as_fd(), buf.as_mut_ptr(), buf.len()) }
+}
+
+/// `read(fd, buf)`—Reads from a stream.
+///
+/// This is equivalent to [`read`], except that it can read into uninitialized
+/// memory. It returns the slice that was initialized by this function and the
+/// slice that remains uninitialized.
+#[inline]
+pub fn read_uninit<Fd: AsFd>(
+    fd: Fd,
+    buf: &mut [MaybeUninit<u8>],
+) -> io::Result<(&mut [u8], &mut [MaybeUninit<u8>])> {
+    // Get number of initialized bytes.
+    let length =
+        unsafe { backend::io::syscalls::read(fd.as_fd(), buf.as_mut_ptr() as *mut u8, buf.len()) };
+
+    // Split into the initialized and uninitialized portions.
+    Ok(unsafe { split_init(buf, length?) })
+}
+
+/// `write(fd, buf)`—Writes to a stream.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/write.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/write.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/write.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=write&sektion=2
+/// [NetBSD]: https://man.netbsd.org/write.2
+/// [OpenBSD]: https://man.openbsd.org/write.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=write&section=2
+/// [illumos]: https://illumos.org/man/2/write
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/I_002fO-Primitives.html#index-writing-to-a-file-descriptor
+#[inline]
+pub fn write<Fd: AsFd>(fd: Fd, buf: &[u8]) -> io::Result<usize> {
+    backend::io::syscalls::write(fd.as_fd(), buf)
+}
+
+/// `pread(fd, buf, offset)`—Reads from a file at a given position.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/pread.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/pread.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/pread.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=pread&sektion=2
+/// [NetBSD]: https://man.netbsd.org/pread.2
+/// [OpenBSD]: https://man.openbsd.org/pread.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=pread&section=2
+/// [illumos]: https://illumos.org/man/2/pread
+#[inline]
+pub fn pread<Fd: AsFd>(fd: Fd, buf: &mut [u8], offset: u64) -> io::Result<usize> {
+    unsafe { backend::io::syscalls::pread(fd.as_fd(), buf.as_mut_ptr(), buf.len(), offset) }
+}
+
+/// `pread(fd, buf, offset)`—Reads from a file at a given position.
+///
+/// This is equivalent to [`pread`], except that it can read into uninitialized
+/// memory. It returns the slice that was initialized by this function and the
+/// slice that remains uninitialized.
+#[inline]
+pub fn pread_uninit<Fd: AsFd>(
+    fd: Fd,
+    buf: &mut [MaybeUninit<u8>],
+    offset: u64,
+) -> io::Result<(&mut [u8], &mut [MaybeUninit<u8>])> {
+    let length = unsafe {
+        backend::io::syscalls::pread(fd.as_fd(), buf.as_mut_ptr() as *mut u8, buf.len(), offset)
+    };
+    Ok(unsafe { split_init(buf, length?) })
+}
+
+/// `pwrite(fd, bufs)`—Writes to a file at a given position.
+///
+/// Contrary to POSIX, on many popular platforms including Linux and FreeBSD,
+/// if the file is opened in append mode, this ignores the offset appends the
+/// data to the end of the file.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/pwrite.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/pwrite.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/pwrite.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=pwrite&sektion=2
+/// [NetBSD]: https://man.netbsd.org/pwrite.2
+/// [OpenBSD]: https://man.openbsd.org/pwrite.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=pwrite&section=2
+/// [illumos]: https://illumos.org/man/2/pwrite
+#[inline]
+pub fn pwrite<Fd: AsFd>(fd: Fd, buf: &[u8], offset: u64) -> io::Result<usize> {
+    backend::io::syscalls::pwrite(fd.as_fd(), buf, offset)
+}
+
+/// `readv(fd, bufs)`—Reads from a stream into multiple buffers.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/readv.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/readv.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/readv.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=readv&sektion=2
+/// [NetBSD]: https://man.netbsd.org/readv.2
+/// [OpenBSD]: https://man.openbsd.org/readv.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=readv&section=2
+/// [illumos]: https://illumos.org/man/2/readv
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+pub fn readv<Fd: AsFd>(fd: Fd, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
+    backend::io::syscalls::readv(fd.as_fd(), bufs)
+}
+
+/// `writev(fd, bufs)`—Writes to a stream from multiple buffers.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/writev.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/writev.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/writev.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=writev&sektion=2
+/// [NetBSD]: https://man.netbsd.org/writev.2
+/// [OpenBSD]: https://man.openbsd.org/writev.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=writev&section=2
+/// [illumos]: https://illumos.org/man/2/writev
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+pub fn writev<Fd: AsFd>(fd: Fd, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
+    backend::io::syscalls::writev(fd.as_fd(), bufs)
+}
+
+/// `preadv(fd, bufs, offset)`—Reads from a file at a given position into
+/// multiple buffers.
+///
+/// # References
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/preadv.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=preadv&sektion=2
+/// [NetBSD]: https://man.netbsd.org/preadv.2
+/// [OpenBSD]: https://man.openbsd.org/preadv.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=preadv&section=2
+/// [illumos]: https://illumos.org/man/2/preadv
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "solaris",
+    target_os = "vita"
+)))]
+#[inline]
+pub fn preadv<Fd: AsFd>(fd: Fd, bufs: &mut [IoSliceMut<'_>], offset: u64) -> io::Result<usize> {
+    backend::io::syscalls::preadv(fd.as_fd(), bufs, offset)
+}
+
+/// `pwritev(fd, bufs, offset)`—Writes to a file at a given position from
+/// multiple buffers.
+///
+/// Contrary to POSIX, on many popular platforms including Linux and FreeBSD,
+/// if the file is opened in append mode, this ignores the offset appends the
+/// data to the end of the file.
+///
+/// # References
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/pwritev.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=pwritev&sektion=2
+/// [NetBSD]: https://man.netbsd.org/pwritev.2
+/// [OpenBSD]: https://man.openbsd.org/pwritev.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=pwritev&section=2
+/// [illumos]: https://illumos.org/man/2/pwritev
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "solaris",
+    target_os = "vita"
+)))]
+#[inline]
+pub fn pwritev<Fd: AsFd>(fd: Fd, bufs: &[IoSlice<'_>], offset: u64) -> io::Result<usize> {
+    backend::io::syscalls::pwritev(fd.as_fd(), bufs, offset)
+}
+
+/// `preadv2(fd, bufs, offset, flags)`—Reads data, with several options.
+///
+/// An `offset` of `u64::MAX` means to use and update the current file offset.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/preadv2.2.html
+#[cfg(linux_kernel)]
+#[inline]
+pub fn preadv2<Fd: AsFd>(
+    fd: Fd,
+    bufs: &mut [IoSliceMut<'_>],
+    offset: u64,
+    flags: ReadWriteFlags,
+) -> io::Result<usize> {
+    backend::io::syscalls::preadv2(fd.as_fd(), bufs, offset, flags)
+}
+
+/// `pwritev2(fd, bufs, offset, flags)`—Writes data, with several options.
+///
+/// An `offset` of `u64::MAX` means to use and update the current file offset.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/pwritev2.2.html
+#[cfg(linux_kernel)]
+#[inline]
+pub fn pwritev2<Fd: AsFd>(
+    fd: Fd,
+    bufs: &[IoSlice<'_>],
+    offset: u64,
+    flags: ReadWriteFlags,
+) -> io::Result<usize> {
+    backend::io::syscalls::pwritev2(fd.as_fd(), bufs, offset, flags)
+}
diff --git a/vendor/rustix/src/io_uring.rs b/vendor/rustix/src/io_uring.rs
new file mode 100644
index 0000000..8394192
--- /dev/null
+++ b/vendor/rustix/src/io_uring.rs
@@ -0,0 +1,1527 @@
+//! Linux [io_uring].
+//!
+//! This API is very low-level. The main adaptations it makes from the raw
+//! Linux io_uring API are the use of appropriately-sized `bitflags`, `enum`,
+//! `Result`, `OwnedFd`, `AsFd`, `RawFd`, and `*mut c_void` in place of plain
+//! integers.
+//!
+//! For a higher-level API built on top of this, see the [rustix-uring] crate.
+//!
+//! # Safety
+//!
+//! io_uring operates on raw pointers and raw file descriptors. Rustix does not
+//! attempt to provide a safe API for these, because the abstraction level is
+//! too low for this to be practical. Safety should be introduced in
+//! higher-level abstraction layers.
+//!
+//! # References
+//!  - [Linux]
+//!  - [io_uring header]
+//!
+//! [Linux]: https://man.archlinux.org/man/io_uring.7.en
+//! [io_uring]: https://en.wikipedia.org/wiki/Io_uring
+//! [io_uring header]: https://github.com/torvalds/linux/blob/master/include/uapi/linux/io_uring.h
+//! [rustix-uring]: https://crates.io/crates/rustix-uring
+#![allow(unsafe_code)]
+
+use crate::fd::{AsFd, BorrowedFd, OwnedFd, RawFd};
+use crate::{backend, io};
+use core::ffi::c_void;
+use core::mem::MaybeUninit;
+use core::ptr::{null_mut, write_bytes};
+use linux_raw_sys::net;
+
+// Export types used in io_uring APIs.
+pub use crate::event::epoll::{
+    Event as EpollEvent, EventData as EpollEventData, EventFlags as EpollEventFlags,
+};
+pub use crate::fs::{Advice, AtFlags, Mode, OFlags, RenameFlags, ResolveFlags, Statx, StatxFlags};
+pub use crate::io::ReadWriteFlags;
+pub use crate::net::{RecvFlags, SendFlags, SocketFlags};
+pub use crate::timespec::Timespec;
+pub use linux_raw_sys::general::sigset_t;
+
+pub use net::{__kernel_sockaddr_storage as sockaddr_storage, msghdr, sockaddr, socklen_t};
+
+// Declare the `c_char` type for use with entries that take pointers
+// to C strings. Define it as unsigned or signed according to the platform
+// so that we match what Rust's `CStr` uses.
+//
+// When we can update to linux-raw-sys 0.5, we can remove this, as its
+// `c_char` type will declare this.
+/// The C `char` type.
+#[cfg(any(
+    target_arch = "aarch64",
+    target_arch = "arm",
+    target_arch = "msp430",
+    target_arch = "powerpc",
+    target_arch = "powerpc64",
+    target_arch = "riscv32",
+    target_arch = "riscv64",
+    target_arch = "s390x",
+))]
+#[allow(non_camel_case_types)]
+pub type c_char = u8;
+/// The C `char` type.
+#[cfg(any(
+    target_arch = "mips",
+    target_arch = "mips64",
+    target_arch = "sparc64",
+    target_arch = "x86",
+    target_arch = "x86_64",
+    target_arch = "xtensa",
+))]
+#[allow(non_camel_case_types)]
+pub type c_char = i8;
+
+mod sys {
+    pub(super) use linux_raw_sys::io_uring::*;
+    #[cfg(test)]
+    pub(super) use {crate::backend::c::iovec, linux_raw_sys::general::open_how};
+}
+
+/// `io_uring_setup(entries, params)`—Setup a context for performing
+/// asynchronous I/O.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man.archlinux.org/man/io_uring_setup.2.en
+#[inline]
+pub fn io_uring_setup(entries: u32, params: &mut io_uring_params) -> io::Result<OwnedFd> {
+    backend::io_uring::syscalls::io_uring_setup(entries, params)
+}
+
+/// `io_uring_register(fd, opcode, arg, nr_args)`—Register files or user
+/// buffers for asynchronous I/O.
+///
+/// # Safety
+///
+/// io_uring operates on raw pointers and raw file descriptors. Users are
+/// responsible for ensuring that memory and resources are only accessed in
+/// valid ways.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man.archlinux.org/man/io_uring_register.2.en
+#[inline]
+pub unsafe fn io_uring_register<Fd: AsFd>(
+    fd: Fd,
+    opcode: IoringRegisterOp,
+    arg: *const c_void,
+    nr_args: u32,
+) -> io::Result<u32> {
+    backend::io_uring::syscalls::io_uring_register(fd.as_fd(), opcode, arg, nr_args)
+}
+
+/// `io_uring_enter(fd, to_submit, min_complete, flags, arg, size)`—Initiate
+/// and/or complete asynchronous I/O.
+///
+/// # Safety
+///
+/// io_uring operates on raw pointers and raw file descriptors. Users are
+/// responsible for ensuring that memory and resources are only accessed in
+/// valid ways.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man.archlinux.org/man/io_uring_enter.2.en
+#[inline]
+pub unsafe fn io_uring_enter<Fd: AsFd>(
+    fd: Fd,
+    to_submit: u32,
+    min_complete: u32,
+    flags: IoringEnterFlags,
+    arg: *const c_void,
+    size: usize,
+) -> io::Result<u32> {
+    backend::io_uring::syscalls::io_uring_enter(
+        fd.as_fd(),
+        to_submit,
+        min_complete,
+        flags,
+        arg,
+        size,
+    )
+}
+
+bitflags::bitflags! {
+    /// `IORING_ENTER_*` flags for use with [`io_uring_enter`].
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringEnterFlags: u32 {
+        /// `IORING_ENTER_GETEVENTS`
+        const GETEVENTS = sys::IORING_ENTER_GETEVENTS;
+
+        /// `IORING_ENTER_SQ_WAKEUP`
+        const SQ_WAKEUP = sys::IORING_ENTER_SQ_WAKEUP;
+
+        /// `IORING_ENTER_SQ_WAIT`
+        const SQ_WAIT = sys::IORING_ENTER_SQ_WAIT;
+
+        /// `IORING_ENTER_EXT_ARG`
+        const EXT_ARG = sys::IORING_ENTER_EXT_ARG;
+
+        /// `IORING_ENTER_REGISTERED_RING`
+        const REGISTERED_RING = sys::IORING_ENTER_REGISTERED_RING;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `IORING_REGISTER_*` and `IORING_UNREGISTER_*` constants for use with
+/// [`io_uring_register`].
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
+#[repr(u8)]
+#[non_exhaustive]
+pub enum IoringRegisterOp {
+    /// `IORING_REGISTER_BUFFERS`
+    RegisterBuffers = sys::IORING_REGISTER_BUFFERS as _,
+
+    /// `IORING_UNREGISTER_BUFFERS`
+    UnregisterBuffers = sys::IORING_UNREGISTER_BUFFERS as _,
+
+    /// `IORING_REGISTER_FILES`
+    RegisterFiles = sys::IORING_REGISTER_FILES as _,
+
+    /// `IORING_UNREGISTER_FILES`
+    UnregisterFiles = sys::IORING_UNREGISTER_FILES as _,
+
+    /// `IORING_REGISTER_EVENTFD`
+    RegisterEventfd = sys::IORING_REGISTER_EVENTFD as _,
+
+    /// `IORING_UNREGISTER_EVENTFD`
+    UnregisterEventfd = sys::IORING_UNREGISTER_EVENTFD as _,
+
+    /// `IORING_REGISTER_FILES_UPDATE`
+    RegisterFilesUpdate = sys::IORING_REGISTER_FILES_UPDATE as _,
+
+    /// `IORING_REGISTER_EVENTFD_ASYNC`
+    RegisterEventfdAsync = sys::IORING_REGISTER_EVENTFD_ASYNC as _,
+
+    /// `IORING_REGISTER_PROBE`
+    RegisterProbe = sys::IORING_REGISTER_PROBE as _,
+
+    /// `IORING_REGISTER_PERSONALITY`
+    RegisterPersonality = sys::IORING_REGISTER_PERSONALITY as _,
+
+    /// `IORING_UNREGISTER_PERSONALITY`
+    UnregisterPersonality = sys::IORING_UNREGISTER_PERSONALITY as _,
+
+    /// `IORING_REGISTER_RESTRICTIONS`
+    RegisterRestrictions = sys::IORING_REGISTER_RESTRICTIONS as _,
+
+    /// `IORING_REGISTER_ENABLE_RINGS`
+    RegisterEnableRings = sys::IORING_REGISTER_ENABLE_RINGS as _,
+
+    /// `IORING_REGISTER_BUFFERS2`
+    RegisterBuffers2 = sys::IORING_REGISTER_BUFFERS2 as _,
+
+    /// `IORING_REGISTER_BUFFERS_UPDATE`
+    RegisterBuffersUpdate = sys::IORING_REGISTER_BUFFERS_UPDATE as _,
+
+    /// `IORING_REGISTER_FILES2`
+    RegisterFiles2 = sys::IORING_REGISTER_FILES2 as _,
+
+    /// `IORING_REGISTER_FILES_SKIP`
+    RegisterFilesSkip = sys::IORING_REGISTER_FILES_SKIP as _,
+
+    /// `IORING_REGISTER_FILES_UPDATE2`
+    RegisterFilesUpdate2 = sys::IORING_REGISTER_FILES_UPDATE2 as _,
+
+    /// `IORING_REGISTER_IOWQ_AFF`
+    RegisterIowqAff = sys::IORING_REGISTER_IOWQ_AFF as _,
+
+    /// `IORING_UNREGISTER_IOWQ_AFF`
+    UnregisterIowqAff = sys::IORING_UNREGISTER_IOWQ_AFF as _,
+
+    /// `IORING_REGISTER_IOWQ_MAX_WORKERS`
+    RegisterIowqMaxWorkers = sys::IORING_REGISTER_IOWQ_MAX_WORKERS as _,
+
+    /// `IORING_REGISTER_RING_FDS`
+    RegisterRingFds = sys::IORING_REGISTER_RING_FDS as _,
+
+    /// `IORING_UNREGISTER_RING_FDS`
+    UnregisterRingFds = sys::IORING_UNREGISTER_RING_FDS as _,
+
+    /// `IORING_REGISTER_PBUF_RING`
+    RegisterPbufRing = sys::IORING_REGISTER_PBUF_RING as _,
+
+    /// `IORING_UNREGISTER_PBUF_RING`
+    UnregisterPbufRing = sys::IORING_UNREGISTER_PBUF_RING as _,
+
+    /// `IORING_REGISTER_SYNC_CANCEL`
+    RegisterSyncCancel = sys::IORING_REGISTER_SYNC_CANCEL as _,
+
+    /// `IORING_REGISTER_FILE_ALLOC_RANGE`
+    RegisterFileAllocRange = sys::IORING_REGISTER_FILE_ALLOC_RANGE as _,
+}
+
+/// `IORING_OP_*` constants for use with [`io_uring_sqe`].
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
+#[repr(u8)]
+#[non_exhaustive]
+pub enum IoringOp {
+    /// `IORING_OP_NOP`
+    Nop = sys::io_uring_op::IORING_OP_NOP as _,
+
+    /// `IORING_OP_ACCEPT`
+    Accept = sys::io_uring_op::IORING_OP_ACCEPT as _,
+
+    /// `IORING_OP_ASYNC_CANCEL`
+    AsyncCancel = sys::io_uring_op::IORING_OP_ASYNC_CANCEL as _,
+
+    /// `IORING_OP_CLOSE`
+    Close = sys::io_uring_op::IORING_OP_CLOSE as _,
+
+    /// `IORING_OP_CONNECT`
+    Connect = sys::io_uring_op::IORING_OP_CONNECT as _,
+
+    /// `IORING_OP_EPOLL_CTL`
+    EpollCtl = sys::io_uring_op::IORING_OP_EPOLL_CTL as _,
+
+    /// `IORING_OP_FADVISE`
+    Fadvise = sys::io_uring_op::IORING_OP_FADVISE as _,
+
+    /// `IORING_OP_FALLOCATE`
+    Fallocate = sys::io_uring_op::IORING_OP_FALLOCATE as _,
+
+    /// `IORING_OP_FILES_UPDATE`
+    FilesUpdate = sys::io_uring_op::IORING_OP_FILES_UPDATE as _,
+
+    /// `IORING_OP_FSYNC`
+    Fsync = sys::io_uring_op::IORING_OP_FSYNC as _,
+
+    /// `IORING_OP_LINKAT`
+    Linkat = sys::io_uring_op::IORING_OP_LINKAT as _,
+
+    /// `IORING_OP_LINK_TIMEOUT`
+    LinkTimeout = sys::io_uring_op::IORING_OP_LINK_TIMEOUT as _,
+
+    /// `IORING_OP_MADVISE`
+    Madvise = sys::io_uring_op::IORING_OP_MADVISE as _,
+
+    /// `IORING_OP_MKDIRAT`
+    Mkdirat = sys::io_uring_op::IORING_OP_MKDIRAT as _,
+
+    /// `IORING_OP_OPENAT`
+    Openat = sys::io_uring_op::IORING_OP_OPENAT as _,
+
+    /// `IORING_OP_OPENAT2`
+    Openat2 = sys::io_uring_op::IORING_OP_OPENAT2 as _,
+
+    /// `IORING_OP_POLL_ADD`
+    PollAdd = sys::io_uring_op::IORING_OP_POLL_ADD as _,
+
+    /// `IORING_OP_POLL_REMOVE`
+    PollRemove = sys::io_uring_op::IORING_OP_POLL_REMOVE as _,
+
+    /// `IORING_OP_PROVIDE_BUFFERS`
+    ProvideBuffers = sys::io_uring_op::IORING_OP_PROVIDE_BUFFERS as _,
+
+    /// `IORING_OP_READ`
+    Read = sys::io_uring_op::IORING_OP_READ as _,
+
+    /// `IORING_OP_READV`
+    Readv = sys::io_uring_op::IORING_OP_READV as _,
+
+    /// `IORING_OP_READ_FIXED`
+    ReadFixed = sys::io_uring_op::IORING_OP_READ_FIXED as _,
+
+    /// `IORING_OP_RECV`
+    Recv = sys::io_uring_op::IORING_OP_RECV as _,
+
+    /// `IORING_OP_RECVMSG`
+    Recvmsg = sys::io_uring_op::IORING_OP_RECVMSG as _,
+
+    /// `IORING_OP_REMOVE_BUFFERS`
+    RemoveBuffers = sys::io_uring_op::IORING_OP_REMOVE_BUFFERS as _,
+
+    /// `IORING_OP_RENAMEAT`
+    Renameat = sys::io_uring_op::IORING_OP_RENAMEAT as _,
+
+    /// `IORING_OP_SEND`
+    Send = sys::io_uring_op::IORING_OP_SEND as _,
+
+    /// `IORING_OP_SENDMSG`
+    Sendmsg = sys::io_uring_op::IORING_OP_SENDMSG as _,
+
+    /// `IORING_OP_SHUTDOWN`
+    Shutdown = sys::io_uring_op::IORING_OP_SHUTDOWN as _,
+
+    /// `IORING_OP_SPLICE`
+    Splice = sys::io_uring_op::IORING_OP_SPLICE as _,
+
+    /// `IORING_OP_STATX`
+    Statx = sys::io_uring_op::IORING_OP_STATX as _,
+
+    /// `IORING_OP_SYMLINKAT`
+    Symlinkat = sys::io_uring_op::IORING_OP_SYMLINKAT as _,
+
+    /// `IORING_OP_SYNC_FILE_RANGE`
+    SyncFileRange = sys::io_uring_op::IORING_OP_SYNC_FILE_RANGE as _,
+
+    /// `IORING_OP_TEE`
+    Tee = sys::io_uring_op::IORING_OP_TEE as _,
+
+    /// `IORING_OP_TIMEOUT`
+    Timeout = sys::io_uring_op::IORING_OP_TIMEOUT as _,
+
+    /// `IORING_OP_TIMEOUT_REMOVE`
+    TimeoutRemove = sys::io_uring_op::IORING_OP_TIMEOUT_REMOVE as _,
+
+    /// `IORING_OP_UNLINKAT`
+    Unlinkat = sys::io_uring_op::IORING_OP_UNLINKAT as _,
+
+    /// `IORING_OP_WRITE`
+    Write = sys::io_uring_op::IORING_OP_WRITE as _,
+
+    /// `IORING_OP_WRITEV`
+    Writev = sys::io_uring_op::IORING_OP_WRITEV as _,
+
+    /// `IORING_OP_WRITE_FIXED`
+    WriteFixed = sys::io_uring_op::IORING_OP_WRITE_FIXED as _,
+
+    /// `IORING_OP_MSG_RING`
+    MsgRing = sys::io_uring_op::IORING_OP_MSG_RING as _,
+
+    /// `IORING_OP_FSETXATTR`
+    Fsetxattr = sys::io_uring_op::IORING_OP_FSETXATTR as _,
+
+    /// `IORING_OP_SETXATTR`
+    Setxattr = sys::io_uring_op::IORING_OP_SETXATTR as _,
+
+    /// `IORING_OP_FGETXATTR`
+    Fgetxattr = sys::io_uring_op::IORING_OP_FGETXATTR as _,
+
+    /// `IORING_OP_GETXATTR`
+    Getxattr = sys::io_uring_op::IORING_OP_GETXATTR as _,
+
+    /// `IORING_OP_SOCKET`
+    Socket = sys::io_uring_op::IORING_OP_SOCKET as _,
+
+    /// `IORING_OP_URING_CMD`
+    UringCmd = sys::io_uring_op::IORING_OP_URING_CMD as _,
+
+    /// `IORING_OP_SEND_ZC`
+    SendZc = sys::io_uring_op::IORING_OP_SEND_ZC as _,
+
+    /// `IORING_OP_SENDMSG_ZC`
+    SendmsgZc = sys::io_uring_op::IORING_OP_SENDMSG_ZC as _,
+}
+
+impl Default for IoringOp {
+    #[inline]
+    fn default() -> Self {
+        Self::Nop
+    }
+}
+
+/// `IORING_RESTRICTION_*` constants for use with [`io_uring_restriction`].
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
+#[repr(u16)]
+#[non_exhaustive]
+pub enum IoringRestrictionOp {
+    /// `IORING_RESTRICTION_REGISTER_OP`
+    RegisterOp = sys::IORING_RESTRICTION_REGISTER_OP as _,
+
+    /// `IORING_RESTRICTION_SQE_FLAGS_ALLOWED`
+    SqeFlagsAllowed = sys::IORING_RESTRICTION_SQE_FLAGS_ALLOWED as _,
+
+    /// `IORING_RESTRICTION_SQE_FLAGS_REQUIRED`
+    SqeFlagsRequired = sys::IORING_RESTRICTION_SQE_FLAGS_REQUIRED as _,
+
+    /// `IORING_RESTRICTION_SQE_OP`
+    SqeOp = sys::IORING_RESTRICTION_SQE_OP as _,
+}
+
+impl Default for IoringRestrictionOp {
+    #[inline]
+    fn default() -> Self {
+        Self::RegisterOp
+    }
+}
+
+/// `IORING_MSG_*` constants which represent commands for use with
+/// [`IoringOp::MsgRing`], (`seq.addr`)
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
+#[repr(u64)]
+#[non_exhaustive]
+pub enum IoringMsgringCmds {
+    /// `IORING_MSG_DATA`
+    Data = sys::IORING_MSG_DATA as _,
+
+    /// `IORING_MSG_SEND_FD`
+    SendFd = sys::IORING_MSG_SEND_FD as _,
+}
+
+bitflags::bitflags! {
+    /// `IORING_SETUP_*` flags for use with [`io_uring_params`].
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringSetupFlags: u32 {
+        /// `IORING_SETUP_ATTACH_WQ`
+        const ATTACH_WQ = sys::IORING_SETUP_ATTACH_WQ;
+
+        /// `IORING_SETUP_CLAMP`
+        const CLAMP = sys::IORING_SETUP_CLAMP;
+
+        /// `IORING_SETUP_CQSIZE`
+        const CQSIZE = sys::IORING_SETUP_CQSIZE;
+
+        /// `IORING_SETUP_IOPOLL`
+        const IOPOLL = sys::IORING_SETUP_IOPOLL;
+
+        /// `IORING_SETUP_R_DISABLED`
+        const R_DISABLED = sys::IORING_SETUP_R_DISABLED;
+
+        /// `IORING_SETUP_SQPOLL`
+        const SQPOLL = sys::IORING_SETUP_SQPOLL;
+
+        /// `IORING_SETUP_SQ_AFF`
+        const SQ_AFF = sys::IORING_SETUP_SQ_AFF;
+
+        /// `IORING_SETUP_SQE128`
+        const SQE128 = sys::IORING_SETUP_SQE128;
+
+        /// `IORING_SETUP_CQE32`
+        const CQE32 = sys::IORING_SETUP_CQE32;
+
+        /// `IORING_SETUP_SUBMIT_ALL`
+        const SUBMIT_ALL = sys::IORING_SETUP_SUBMIT_ALL;
+
+        /// `IORING_SETUP_COOP_TRASKRUN`
+        const COOP_TASKRUN = sys::IORING_SETUP_COOP_TASKRUN;
+
+        /// `IORING_SETUP_TASKRUN_FLAG`
+        const TASKRUN_FLAG = sys::IORING_SETUP_TASKRUN_FLAG;
+
+        /// `IORING_SETUP_SINGLE_ISSUER`
+        const SINGLE_ISSUER = sys::IORING_SETUP_SINGLE_ISSUER;
+
+        /// `IORING_SETUP_DEFER_TASKRUN`
+        const DEFER_TASKRUN = sys::IORING_SETUP_DEFER_TASKRUN;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// `IOSQE_*` flags for use with [`io_uring_sqe`].
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringSqeFlags: u8 {
+        /// `1 << IOSQE_ASYNC_BIT`
+        const ASYNC = 1 << sys::IOSQE_ASYNC_BIT as u8;
+
+        /// `1 << IOSQE_BUFFER_SELECT_BIT`
+        const BUFFER_SELECT = 1 << sys::IOSQE_BUFFER_SELECT_BIT as u8;
+
+        /// `1 << IOSQE_FIXED_FILE_BIT`
+        const FIXED_FILE = 1 << sys::IOSQE_FIXED_FILE_BIT as u8;
+
+        /// 1 << `IOSQE_IO_DRAIN_BIT`
+        const IO_DRAIN = 1 << sys::IOSQE_IO_DRAIN_BIT as u8;
+
+        /// `1 << IOSQE_IO_HARDLINK_BIT`
+        const IO_HARDLINK = 1 << sys::IOSQE_IO_HARDLINK_BIT as u8;
+
+        /// `1 << IOSQE_IO_LINK_BIT`
+        const IO_LINK = 1 << sys::IOSQE_IO_LINK_BIT as u8;
+
+        /// `1 << IOSQE_CQE_SKIP_SUCCESS_BIT`
+        const CQE_SKIP_SUCCESS = 1 << sys::IOSQE_CQE_SKIP_SUCCESS_BIT as u8;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// `IORING_CQE_F_*` flags for use with [`io_uring_cqe`].
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringCqeFlags: u32 {
+        /// `IORING_CQE_F_BUFFER`
+        const BUFFER = bitcast!(sys::IORING_CQE_F_BUFFER);
+
+        /// `IORING_CQE_F_MORE`
+        const MORE = bitcast!(sys::IORING_CQE_F_MORE);
+
+        /// `IORING_CQE_F_SOCK_NONEMPTY`
+        const SOCK_NONEMPTY = bitcast!(sys::IORING_CQE_F_SOCK_NONEMPTY);
+
+        /// `IORING_CQE_F_NOTIF`
+        const NOTIF = bitcast!(sys::IORING_CQE_F_NOTIF);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// `IORING_FSYNC_*` flags for use with [`io_uring_sqe`].
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringFsyncFlags: u32 {
+        /// `IORING_FSYNC_DATASYNC`
+        const DATASYNC = sys::IORING_FSYNC_DATASYNC;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// `IORING_TIMEOUT_*` and `IORING_LINK_TIMEOUT_UPDATE` flags for use with
+    /// [`io_uring_sqe`].
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringTimeoutFlags: u32 {
+        /// `IORING_TIMEOUT_ABS`
+        const ABS = sys::IORING_TIMEOUT_ABS;
+
+        /// `IORING_TIMEOUT_UPDATE`
+        const UPDATE = sys::IORING_TIMEOUT_UPDATE;
+
+        /// `IORING_TIMEOUT_BOOTTIME`
+        const BOOTTIME = sys::IORING_TIMEOUT_BOOTTIME;
+
+        /// `IORING_TIMEOUT_ETIME_SUCCESS`
+        const ETIME_SUCCESS = sys::IORING_TIMEOUT_ETIME_SUCCESS;
+
+        /// `IORING_TIMEOUT_REALTIME`
+        const REALTIME = sys::IORING_TIMEOUT_REALTIME;
+
+        /// `IORING_TIMEOUT_CLOCK_MASK`
+        const CLOCK_MASK = sys::IORING_TIMEOUT_CLOCK_MASK;
+
+        /// `IORING_TIMEOUT_UPDATE_MASK`
+        const UPDATE_MASK = sys::IORING_TIMEOUT_UPDATE_MASK;
+
+        /// `IORING_LINK_TIMEOUT_UPDATE`
+        const LINK_TIMEOUT_UPDATE = sys::IORING_LINK_TIMEOUT_UPDATE;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// `SPLICE_F_*` flags for use with [`io_uring_sqe`].
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct SpliceFlags: u32 {
+        /// `SPLICE_F_FD_IN_FIXED`
+        const FD_IN_FIXED = sys::SPLICE_F_FD_IN_FIXED;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// `IORING_MSG_RING_*` flags for use with [`io_uring_sqe`].
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringMsgringFlags: u32 {
+        /// `IORING_MSG_RING_CQE_SKIP`
+        const CQE_SKIP = sys::IORING_MSG_RING_CQE_SKIP;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// `IORING_ASYNC_CANCEL_*` flags for use with [`io_uring_sqe`].
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringAsyncCancelFlags: u32 {
+        /// `IORING_ASYNC_CANCEL_ALL`
+        const ALL = sys::IORING_ASYNC_CANCEL_ALL;
+
+        /// `IORING_ASYNC_CANCEL_FD`
+        const FD = sys::IORING_ASYNC_CANCEL_FD;
+
+        /// `IORING_ASYNC_CANCEL_FD`
+        const ANY = sys::IORING_ASYNC_CANCEL_ANY;
+
+        /// `IORING_ASYNC_CANCEL_FD`
+        const FD_FIXED = sys::IORING_ASYNC_CANCEL_FD_FIXED;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// `IORING_FEAT_*` flags for use with [`io_uring_params`].
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringFeatureFlags: u32 {
+        /// `IORING_FEAT_CQE_SKIP`
+        const CQE_SKIP = sys::IORING_FEAT_CQE_SKIP;
+
+        /// `IORING_FEAT_CUR_PERSONALITY`
+        const CUR_PERSONALITY = sys::IORING_FEAT_CUR_PERSONALITY;
+
+        /// `IORING_FEAT_EXT_ARG`
+        const EXT_ARG = sys::IORING_FEAT_EXT_ARG;
+
+        /// `IORING_FEAT_FAST_POLL`
+        const FAST_POLL = sys::IORING_FEAT_FAST_POLL;
+
+        /// `IORING_FEAT_NATIVE_WORKERS`
+        const NATIVE_WORKERS = sys::IORING_FEAT_NATIVE_WORKERS;
+
+        /// `IORING_FEAT_NODROP`
+        const NODROP = sys::IORING_FEAT_NODROP;
+
+        /// `IORING_FEAT_POLL_32BITS`
+        const POLL_32BITS = sys::IORING_FEAT_POLL_32BITS;
+
+        /// `IORING_FEAT_RSRC_TAGS`
+        const RSRC_TAGS = sys::IORING_FEAT_RSRC_TAGS;
+
+        /// `IORING_FEAT_RW_CUR_POS`
+        const RW_CUR_POS = sys::IORING_FEAT_RW_CUR_POS;
+
+        /// `IORING_FEAT_SINGLE_MMAP`
+        const SINGLE_MMAP = sys::IORING_FEAT_SINGLE_MMAP;
+
+        /// `IORING_FEAT_SQPOLL_NONFIXED`
+        const SQPOLL_NONFIXED = sys::IORING_FEAT_SQPOLL_NONFIXED;
+
+        /// `IORING_FEAT_SUBMIT_STABLE`
+        const SUBMIT_STABLE = sys::IORING_FEAT_SUBMIT_STABLE;
+
+        /// `IORING_FEAT_LINKED_FILE`
+        const LINKED_FILE = sys::IORING_FEAT_LINKED_FILE;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// `IO_URING_OP_*` flags for use with [`io_uring_probe_op`].
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringOpFlags: u16 {
+        /// `IO_URING_OP_SUPPORTED`
+        const SUPPORTED = sys::IO_URING_OP_SUPPORTED as _;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// `IORING_RSRC_*` flags for use with [`io_uring_rsrc_register`].
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringRsrcFlags: u32 {
+        /// `IORING_RSRC_REGISTER_SPARSE`
+        const REGISTER_SPARSE = sys::IORING_RSRC_REGISTER_SPARSE as _;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// `IORING_SQ_*` flags.
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringSqFlags: u32 {
+        /// `IORING_SQ_NEED_WAKEUP`
+        const NEED_WAKEUP = sys::IORING_SQ_NEED_WAKEUP;
+
+        /// `IORING_SQ_CQ_OVERFLOW`
+        const CQ_OVERFLOW = sys::IORING_SQ_CQ_OVERFLOW;
+
+        /// `IORING_SQ_TASKRUN`
+        const TASKRUN = sys::IORING_SQ_TASKRUN;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// `IORING_CQ_*` flags.
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringCqFlags: u32 {
+        /// `IORING_CQ_EVENTFD_DISABLED`
+        const EVENTFD_DISABLED = sys::IORING_CQ_EVENTFD_DISABLED;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// `IORING_POLL_*` flags.
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringPollFlags: u32 {
+        /// `IORING_POLL_ADD_MULTI`
+        const ADD_MULTI = sys::IORING_POLL_ADD_MULTI;
+
+        /// `IORING_POLL_UPDATE_EVENTS`
+        const UPDATE_EVENTS = sys::IORING_POLL_UPDATE_EVENTS;
+
+        /// `IORING_POLL_UPDATE_USER_DATA`
+        const UPDATE_USER_DATA = sys::IORING_POLL_UPDATE_USER_DATA;
+
+        /// `IORING_POLL_ADD_LEVEL`
+        const ADD_LEVEL = sys::IORING_POLL_ADD_LEVEL;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// send/sendmsg flags (`sqe.ioprio`)
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringSendFlags: u16 {
+        /// `IORING_RECVSEND_POLL_FIRST`.
+        ///
+        /// See also [`IoringRecvFlags::POLL_FIRST`].
+        const POLL_FIRST = sys::IORING_RECVSEND_POLL_FIRST as _;
+
+        /// `IORING_RECVSEND_FIXED_BUF`
+        ///
+        /// See also [`IoringRecvFlags::FIXED_BUF`].
+        const FIXED_BUF = sys::IORING_RECVSEND_FIXED_BUF as _;
+
+        /// `IORING_SEND_ZC_REPORT_USAGE` (since Linux 6.2)
+        const ZC_REPORT_USAGE = sys::IORING_SEND_ZC_REPORT_USAGE as _;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// recv/recvmsg flags (`sqe.ioprio`)
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringRecvFlags: u16 {
+        /// `IORING_RECVSEND_POLL_FIRST`
+        ///
+        /// See also [`IoringSendFlags::POLL_FIRST`].
+        const POLL_FIRST = sys::IORING_RECVSEND_POLL_FIRST as _;
+
+        /// `IORING_RECV_MULTISHOT`
+        const MULTISHOT = sys::IORING_RECV_MULTISHOT as _;
+
+        /// `IORING_RECVSEND_FIXED_BUF`
+        ///
+        /// See also [`IoringSendFlags::FIXED_BUF`].
+        const FIXED_BUF = sys::IORING_RECVSEND_FIXED_BUF as _;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// accept flags (`sqe.ioprio`)
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct IoringAcceptFlags: u16 {
+        /// `IORING_ACCEPT_MULTISHOT`
+        const MULTISHOT = sys::IORING_ACCEPT_MULTISHOT as _;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags::bitflags! {
+    /// recvmsg out flags
+    #[repr(transparent)]
+    #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct RecvmsgOutFlags: u32 {
+        /// `MSG_EOR`
+        const EOR = net::MSG_EOR;
+
+        /// `MSG_TRUNC`
+        const TRUNC = net::MSG_TRUNC;
+
+        /// `MSG_CTRUNC`
+        const CTRUNC = net::MSG_CTRUNC;
+
+        /// `MSG_OOB`
+        const OOB = net::MSG_OOB;
+
+        /// `MSG_ERRQUEUE`
+        const ERRQUEUE = net::MSG_ERRQUEUE;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[allow(missing_docs)]
+pub const IORING_CQE_BUFFER_SHIFT: u32 = sys::IORING_CQE_BUFFER_SHIFT as _;
+#[allow(missing_docs)]
+pub const IORING_FILE_INDEX_ALLOC: i32 = sys::IORING_FILE_INDEX_ALLOC as _;
+
+// Re-export these as `u64`, which is the `offset` type in `rustix::io::mmap`.
+#[allow(missing_docs)]
+pub const IORING_OFF_SQ_RING: u64 = sys::IORING_OFF_SQ_RING as _;
+#[allow(missing_docs)]
+pub const IORING_OFF_CQ_RING: u64 = sys::IORING_OFF_CQ_RING as _;
+#[allow(missing_docs)]
+pub const IORING_OFF_SQES: u64 = sys::IORING_OFF_SQES as _;
+
+/// `IORING_REGISTER_FILES_SKIP`
+#[inline]
+#[doc(alias = "IORING_REGISTER_FILES_SKIP")]
+pub const fn io_uring_register_files_skip() -> BorrowedFd<'static> {
+    let files_skip = sys::IORING_REGISTER_FILES_SKIP as RawFd;
+
+    // SAFETY: `IORING_REGISTER_FILES_SKIP` is a reserved value that is never
+    // dynamically allocated, so it'll remain valid for the duration of
+    // `'static`.
+    unsafe { BorrowedFd::<'static>::borrow_raw(files_skip) }
+}
+
+/// `IORING_NOTIF_USAGE_ZC_COPIED` (since Linux 6.2)
+pub const IORING_NOTIF_USAGE_ZC_COPIED: i32 = sys::IORING_NOTIF_USAGE_ZC_COPIED as _;
+
+/// A pointer in the io_uring API.
+///
+/// `io_uring`'s native API represents pointers as `u64` values. In order to
+/// preserve strict-provenance, use a `*mut c_void`. On platforms where
+/// pointers are narrower than 64 bits, this requires additional padding.
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct io_uring_ptr {
+    #[cfg(all(target_pointer_width = "32", target_endian = "big"))]
+    #[doc(hidden)]
+    pub __pad32: u32,
+    #[cfg(all(target_pointer_width = "16", target_endian = "big"))]
+    #[doc(hidden)]
+    pub __pad16: u16,
+
+    /// The pointer value.
+    pub ptr: *mut c_void,
+
+    #[cfg(all(target_pointer_width = "16", target_endian = "little"))]
+    #[doc(hidden)]
+    pub __pad16: u16,
+    #[cfg(all(target_pointer_width = "32", target_endian = "little"))]
+    #[doc(hidden)]
+    pub __pad32: u32,
+}
+
+impl From<*mut c_void> for io_uring_ptr {
+    #[inline]
+    fn from(ptr: *mut c_void) -> Self {
+        Self {
+            ptr,
+
+            #[cfg(target_pointer_width = "16")]
+            __pad16: Default::default(),
+            #[cfg(any(target_pointer_width = "16", target_pointer_width = "32"))]
+            __pad32: Default::default(),
+        }
+    }
+}
+
+impl Default for io_uring_ptr {
+    #[inline]
+    fn default() -> Self {
+        Self::from(null_mut())
+    }
+}
+
+/// User data in the io_uring API.
+///
+/// `io_uring`'s native API represents `user_data` fields as `u64` values. In
+/// order to preserve strict-provenance, use a union which allows users to
+/// optionally store pointers.
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub union io_uring_user_data {
+    /// An arbitrary `u64`.
+    pub u64_: u64,
+
+    /// A pointer.
+    pub ptr: io_uring_ptr,
+}
+
+impl io_uring_user_data {
+    /// Return the `u64` value.
+    #[inline]
+    pub fn u64_(self) -> u64 {
+        // SAFETY: All the fields have the same underlying representation.
+        unsafe { self.u64_ }
+    }
+
+    /// Create a `Self` from a `u64` value.
+    #[inline]
+    pub fn from_u64(u64_: u64) -> Self {
+        Self { u64_ }
+    }
+
+    /// Return the `ptr` pointer value.
+    #[inline]
+    pub fn ptr(self) -> *mut c_void {
+        // SAFETY: All the fields have the same underlying representation.
+        unsafe { self.ptr }.ptr
+    }
+
+    /// Create a `Self` from a pointer value.
+    #[inline]
+    pub fn from_ptr(ptr: *mut c_void) -> Self {
+        Self {
+            ptr: io_uring_ptr::from(ptr),
+        }
+    }
+}
+
+impl Default for io_uring_user_data {
+    #[inline]
+    fn default() -> Self {
+        let mut s = MaybeUninit::<Self>::uninit();
+        // SAFETY: All of Linux's io_uring structs may be zero-initialized.
+        unsafe {
+            write_bytes(s.as_mut_ptr(), 0, 1);
+            s.assume_init()
+        }
+    }
+}
+
+impl core::fmt::Debug for io_uring_user_data {
+    fn fmt(&self, fmt: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        // SAFETY: Just format as a `u64`, since formatting doesn't preserve
+        // provenance, and we don't have a discriminant.
+        unsafe { self.u64_.fmt(fmt) }
+    }
+}
+
+/// An io_uring Submission Queue Entry.
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Copy, Clone, Default)]
+pub struct io_uring_sqe {
+    pub opcode: IoringOp,
+    pub flags: IoringSqeFlags,
+    pub ioprio: ioprio_union,
+    pub fd: RawFd,
+    pub off_or_addr2: off_or_addr2_union,
+    pub addr_or_splice_off_in: addr_or_splice_off_in_union,
+    pub len: len_union,
+    pub op_flags: op_flags_union,
+    pub user_data: io_uring_user_data,
+    pub buf: buf_union,
+    pub personality: u16,
+    pub splice_fd_in_or_file_index: splice_fd_in_or_file_index_union,
+    pub addr3_or_cmd: addr3_or_cmd_union,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub union ioprio_union {
+    pub recv_flags: IoringRecvFlags,
+    pub send_flags: IoringSendFlags,
+    pub accept_flags: IoringAcceptFlags,
+    pub ioprio: u16,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub union len_union {
+    pub poll_flags: IoringPollFlags,
+    pub len: u32,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub union addr3_or_cmd_union {
+    pub addr3: addr3_struct,
+    pub cmd: [u8; 0],
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Copy, Clone, Default)]
+pub struct addr3_struct {
+    pub addr3: u64,
+    pub __pad2: [u64; 1],
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub union off_or_addr2_union {
+    pub off: u64,
+    pub addr2: io_uring_ptr,
+    pub cmd_op: cmd_op_struct,
+    pub user_data: io_uring_user_data,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct cmd_op_struct {
+    pub cmd_op: u32,
+    pub __pad1: u32,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub union addr_or_splice_off_in_union {
+    pub addr: io_uring_ptr,
+    pub splice_off_in: u64,
+    pub msgring_cmd: IoringMsgringCmds,
+    pub user_data: io_uring_user_data,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub union op_flags_union {
+    pub rw_flags: crate::io::ReadWriteFlags,
+    pub fsync_flags: IoringFsyncFlags,
+    pub poll_events: u16,
+    pub poll32_events: u32,
+    pub sync_range_flags: u32,
+    /// `msg_flags` is split into `send_flags` and `recv_flags`.
+    #[doc(alias = "msg_flags")]
+    pub send_flags: SendFlags,
+    /// `msg_flags` is split into `send_flags` and `recv_flags`.
+    #[doc(alias = "msg_flags")]
+    pub recv_flags: RecvFlags,
+    pub timeout_flags: IoringTimeoutFlags,
+    pub accept_flags: SocketFlags,
+    pub cancel_flags: IoringAsyncCancelFlags,
+    pub open_flags: OFlags,
+    pub statx_flags: AtFlags,
+    pub fadvise_advice: Advice,
+    pub splice_flags: SpliceFlags,
+    pub rename_flags: RenameFlags,
+    pub unlink_flags: AtFlags,
+    pub hardlink_flags: AtFlags,
+    pub msg_ring_flags: IoringMsgringFlags,
+}
+
+#[allow(missing_docs)]
+#[repr(C, packed)]
+#[derive(Copy, Clone)]
+pub union buf_union {
+    pub buf_index: u16,
+    pub buf_group: u16,
+}
+
+// TODO: Rename this to include `addr_len` when we have a semver bump?
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub union splice_fd_in_or_file_index_union {
+    pub splice_fd_in: i32,
+    pub file_index: u32,
+    pub addr_len: addr_len_struct,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct addr_len_struct {
+    pub addr_len: u16,
+    pub __pad3: [u16; 1],
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct io_uring_sync_cancel_reg {
+    pub addr: u64,
+    pub fd: i32,
+    pub flags: IoringAsyncCancelFlags,
+    pub timeout: Timespec,
+    pub pad: [u64; 4],
+}
+
+/// An io_uring Completion Queue Entry.
+///
+/// This does not derive `Copy` or `Clone` because the `big_cqe` field is not
+/// automatically copyable.
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Debug, Default)]
+pub struct io_uring_cqe {
+    pub user_data: io_uring_user_data,
+    pub res: i32,
+    pub flags: IoringCqeFlags,
+    pub big_cqe: sys::__IncompleteArrayField<u64>,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Copy, Clone, Default)]
+pub struct io_uring_restriction {
+    pub opcode: IoringRestrictionOp,
+    pub register_or_sqe_op_or_sqe_flags: register_or_sqe_op_or_sqe_flags_union,
+    pub resv: u8,
+    pub resv2: [u32; 3],
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub union register_or_sqe_op_or_sqe_flags_union {
+    pub register_op: IoringRegisterOp,
+    pub sqe_op: IoringOp,
+    pub sqe_flags: IoringSqeFlags,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Debug, Copy, Clone, Default)]
+pub struct io_uring_params {
+    pub sq_entries: u32,
+    pub cq_entries: u32,
+    pub flags: IoringSetupFlags,
+    pub sq_thread_cpu: u32,
+    pub sq_thread_idle: u32,
+    pub features: IoringFeatureFlags,
+    pub wq_fd: u32,
+    pub resv: [u32; 3],
+    pub sq_off: io_sqring_offsets,
+    pub cq_off: io_cqring_offsets,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Debug, Copy, Clone, Default)]
+pub struct io_sqring_offsets {
+    pub head: u32,
+    pub tail: u32,
+    pub ring_mask: u32,
+    pub ring_entries: u32,
+    pub flags: u32,
+    pub dropped: u32,
+    pub array: u32,
+    pub resv1: u32,
+    pub resv2: u64,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Debug, Copy, Clone, Default)]
+pub struct io_cqring_offsets {
+    pub head: u32,
+    pub tail: u32,
+    pub ring_mask: u32,
+    pub ring_entries: u32,
+    pub overflow: u32,
+    pub cqes: u32,
+    pub flags: u32,
+    pub resv1: u32,
+    pub resv2: u64,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Debug, Default)]
+pub struct io_uring_probe {
+    pub last_op: IoringOp,
+    pub ops_len: u8,
+    pub resv: u16,
+    pub resv2: [u32; 3],
+    pub ops: sys::__IncompleteArrayField<io_uring_probe_op>,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Debug, Copy, Clone, Default)]
+pub struct io_uring_probe_op {
+    pub op: IoringOp,
+    pub resv: u8,
+    pub flags: IoringOpFlags,
+    pub resv2: u32,
+}
+
+#[allow(missing_docs)]
+#[repr(C, align(8))]
+#[derive(Debug, Copy, Clone, Default)]
+pub struct io_uring_files_update {
+    pub offset: u32,
+    pub resv: u32,
+    pub fds: u64,
+}
+
+#[allow(missing_docs)]
+#[repr(C, align(8))]
+#[derive(Debug, Copy, Clone, Default)]
+pub struct io_uring_rsrc_register {
+    pub nr: u32,
+    pub flags: IoringRsrcFlags,
+    pub resv2: u64,
+    pub data: u64,
+    pub tags: u64,
+}
+
+#[allow(missing_docs)]
+#[repr(C, align(8))]
+#[derive(Debug, Copy, Clone, Default)]
+pub struct io_uring_rsrc_update {
+    pub offset: u32,
+    pub resv: u32,
+    pub data: u64,
+}
+
+#[allow(missing_docs)]
+#[repr(C, align(8))]
+#[derive(Debug, Copy, Clone, Default)]
+pub struct io_uring_rsrc_update2 {
+    pub offset: u32,
+    pub resv: u32,
+    pub data: u64,
+    pub tags: u64,
+    pub nr: u32,
+    pub resv2: u32,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Debug, Copy, Clone, Default)]
+pub struct io_uring_getevents_arg {
+    pub sigmask: u64,
+    pub sigmask_sz: u32,
+    pub pad: u32,
+    pub ts: u64,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct io_uring_recvmsg_out {
+    pub namelen: u32,
+    pub controllen: u32,
+    pub payloadlen: u32,
+    pub flags: RecvmsgOutFlags,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+pub struct iovec {
+    pub iov_base: *mut c_void,
+    pub iov_len: usize,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Debug, Copy, Clone, Default)]
+pub struct open_how {
+    /// An [`OFlags`] value represented as a `u64`.
+    pub flags: u64,
+
+    /// A [`Mode`] value represented as a `u64`.
+    pub mode: u64,
+
+    pub resolve: ResolveFlags,
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Debug, Copy, Clone, Default)]
+pub struct io_uring_buf_reg {
+    pub ring_addr: u64,
+    pub ring_entries: u32,
+    pub bgid: u16,
+    pub pad: u16,
+    pub resv: [u64; 3_usize],
+}
+
+#[allow(missing_docs)]
+#[repr(C)]
+#[derive(Debug, Copy, Clone, Default)]
+pub struct io_uring_buf {
+    pub addr: u64,
+    pub len: u32,
+    pub bid: u16,
+    pub resv: u16,
+}
+
+impl Default for ioprio_union {
+    #[inline]
+    fn default() -> Self {
+        default_union!(ioprio_union, ioprio)
+    }
+}
+
+impl Default for len_union {
+    #[inline]
+    fn default() -> Self {
+        default_union!(len_union, len)
+    }
+}
+
+impl Default for off_or_addr2_union {
+    #[inline]
+    fn default() -> Self {
+        default_union!(off_or_addr2_union, off)
+    }
+}
+
+impl Default for addr_or_splice_off_in_union {
+    #[inline]
+    fn default() -> Self {
+        default_union!(addr_or_splice_off_in_union, splice_off_in)
+    }
+}
+
+impl Default for addr3_or_cmd_union {
+    #[inline]
+    fn default() -> Self {
+        default_union!(addr3_or_cmd_union, addr3)
+    }
+}
+
+impl Default for op_flags_union {
+    #[inline]
+    fn default() -> Self {
+        default_union!(op_flags_union, sync_range_flags)
+    }
+}
+
+impl Default for buf_union {
+    #[inline]
+    fn default() -> Self {
+        default_union!(buf_union, buf_index)
+    }
+}
+
+impl Default for splice_fd_in_or_file_index_union {
+    #[inline]
+    fn default() -> Self {
+        default_union!(splice_fd_in_or_file_index_union, splice_fd_in)
+    }
+}
+
+impl Default for register_or_sqe_op_or_sqe_flags_union {
+    #[inline]
+    fn default() -> Self {
+        default_union!(register_or_sqe_op_or_sqe_flags_union, sqe_flags)
+    }
+}
+
+/// Check that our custom structs and unions have the same layout as the
+/// kernel's versions.
+#[test]
+fn io_uring_layouts() {
+    use sys as c;
+
+    assert_eq_size!(io_uring_ptr, u64);
+
+    check_renamed_type!(off_or_addr2_union, io_uring_sqe__bindgen_ty_1);
+    check_renamed_type!(addr_or_splice_off_in_union, io_uring_sqe__bindgen_ty_2);
+    check_renamed_type!(addr3_or_cmd_union, io_uring_sqe__bindgen_ty_6);
+    check_renamed_type!(op_flags_union, io_uring_sqe__bindgen_ty_3);
+    check_renamed_type!(buf_union, io_uring_sqe__bindgen_ty_4);
+    check_renamed_type!(splice_fd_in_or_file_index_union, io_uring_sqe__bindgen_ty_5);
+    check_renamed_type!(addr_len_struct, io_uring_sqe__bindgen_ty_5__bindgen_ty_1);
+    check_renamed_type!(
+        register_or_sqe_op_or_sqe_flags_union,
+        io_uring_restriction__bindgen_ty_1
+    );
+
+    check_renamed_type!(addr3_struct, io_uring_sqe__bindgen_ty_6__bindgen_ty_1);
+    check_renamed_type!(cmd_op_struct, io_uring_sqe__bindgen_ty_1__bindgen_ty_1);
+
+    check_type!(io_uring_sqe);
+    check_struct_field!(io_uring_sqe, opcode);
+    check_struct_field!(io_uring_sqe, flags);
+    check_struct_field!(io_uring_sqe, ioprio);
+    check_struct_field!(io_uring_sqe, fd);
+    check_struct_renamed_field!(io_uring_sqe, off_or_addr2, __bindgen_anon_1);
+    check_struct_renamed_field!(io_uring_sqe, addr_or_splice_off_in, __bindgen_anon_2);
+    check_struct_field!(io_uring_sqe, len);
+    check_struct_renamed_field!(io_uring_sqe, op_flags, __bindgen_anon_3);
+    check_struct_field!(io_uring_sqe, user_data);
+    check_struct_renamed_field!(io_uring_sqe, buf, __bindgen_anon_4);
+    check_struct_field!(io_uring_sqe, personality);
+    check_struct_renamed_field!(io_uring_sqe, splice_fd_in_or_file_index, __bindgen_anon_5);
+    check_struct_renamed_field!(io_uring_sqe, addr3_or_cmd, __bindgen_anon_6);
+
+    check_type!(io_uring_restriction);
+    check_struct_field!(io_uring_restriction, opcode);
+    check_struct_renamed_field!(
+        io_uring_restriction,
+        register_or_sqe_op_or_sqe_flags,
+        __bindgen_anon_1
+    );
+    check_struct_field!(io_uring_restriction, resv);
+    check_struct_field!(io_uring_restriction, resv2);
+
+    check_struct!(io_uring_cqe, user_data, res, flags, big_cqe);
+    check_struct!(
+        io_uring_params,
+        sq_entries,
+        cq_entries,
+        flags,
+        sq_thread_cpu,
+        sq_thread_idle,
+        features,
+        wq_fd,
+        resv,
+        sq_off,
+        cq_off
+    );
+    check_struct!(
+        io_sqring_offsets,
+        head,
+        tail,
+        ring_mask,
+        ring_entries,
+        flags,
+        dropped,
+        array,
+        resv1,
+        resv2
+    );
+    check_struct!(
+        io_cqring_offsets,
+        head,
+        tail,
+        ring_mask,
+        ring_entries,
+        overflow,
+        cqes,
+        flags,
+        resv1,
+        resv2
+    );
+    check_struct!(io_uring_recvmsg_out, namelen, controllen, payloadlen, flags);
+    check_struct!(io_uring_probe, last_op, ops_len, resv, resv2, ops);
+    check_struct!(io_uring_probe_op, op, resv, flags, resv2);
+    check_struct!(io_uring_files_update, offset, resv, fds);
+    check_struct!(io_uring_rsrc_register, nr, flags, resv2, data, tags);
+    check_struct!(io_uring_rsrc_update, offset, resv, data);
+    check_struct!(io_uring_rsrc_update2, offset, resv, data, tags, nr, resv2);
+    check_struct!(io_uring_getevents_arg, sigmask, sigmask_sz, pad, ts);
+    check_struct!(iovec, iov_base, iov_len);
+    check_struct!(open_how, flags, mode, resolve);
+    check_struct!(io_uring_buf_reg, ring_addr, ring_entries, bgid, pad, resv);
+    check_struct!(io_uring_buf, addr, len, bid, resv);
+    check_struct!(io_uring_sync_cancel_reg, addr, fd, flags, timeout, pad);
+}
diff --git a/vendor/rustix/src/ioctl/bsd.rs b/vendor/rustix/src/ioctl/bsd.rs
new file mode 100644
index 0000000..2639d81
--- /dev/null
+++ b/vendor/rustix/src/ioctl/bsd.rs
@@ -0,0 +1,27 @@
+//! `ioctl` opcode behavior for BSD platforms.
+
+use super::{Direction, RawOpcode};
+
+pub(super) const fn compose_opcode(
+    dir: Direction,
+    group: RawOpcode,
+    num: RawOpcode,
+    size: RawOpcode,
+) -> RawOpcode {
+    let dir = match dir {
+        Direction::None => NONE,
+        Direction::Read => READ,
+        Direction::Write => WRITE,
+        Direction::ReadWrite => READ | WRITE,
+    };
+
+    dir | num | (group << 8) | ((size & IOCPARAM_MASK) << 16)
+}
+
+// `IOC_VOID`
+pub const NONE: RawOpcode = 0x2000_0000;
+// `IOC_OUT` ("out" is from the perspective of the kernel)
+pub const READ: RawOpcode = 0x4000_0000;
+// `IOC_IN`
+pub const WRITE: RawOpcode = 0x8000_0000;
+pub const IOCPARAM_MASK: RawOpcode = 0x1FFF;
diff --git a/vendor/rustix/src/ioctl/linux.rs b/vendor/rustix/src/ioctl/linux.rs
new file mode 100644
index 0000000..2f3599f
--- /dev/null
+++ b/vendor/rustix/src/ioctl/linux.rs
@@ -0,0 +1,118 @@
+//! `ioctl` opcode behavior for Linux platforms.
+
+use super::{Direction, RawOpcode};
+use consts::*;
+
+/// Compose an opcode from its component parts.
+pub(super) const fn compose_opcode(
+    dir: Direction,
+    group: RawOpcode,
+    num: RawOpcode,
+    size: RawOpcode,
+) -> RawOpcode {
+    macro_rules! mask_and_shift {
+        ($val:expr, $shift:expr, $mask:expr) => {{
+            ($val & $mask) << $shift
+        }};
+    }
+
+    let dir = match dir {
+        Direction::None => NONE,
+        Direction::Read => READ,
+        Direction::Write => WRITE,
+        Direction::ReadWrite => READ | WRITE,
+    };
+
+    mask_and_shift!(group, GROUP_SHIFT, GROUP_MASK)
+        | mask_and_shift!(num, NUM_SHIFT, NUM_MASK)
+        | mask_and_shift!(size, SIZE_SHIFT, SIZE_MASK)
+        | mask_and_shift!(dir, DIR_SHIFT, DIR_MASK)
+}
+
+const NUM_BITS: RawOpcode = 8;
+const GROUP_BITS: RawOpcode = 8;
+
+const NUM_SHIFT: RawOpcode = 0;
+const GROUP_SHIFT: RawOpcode = NUM_SHIFT + NUM_BITS;
+const SIZE_SHIFT: RawOpcode = GROUP_SHIFT + GROUP_BITS;
+const DIR_SHIFT: RawOpcode = SIZE_SHIFT + SIZE_BITS;
+
+const NUM_MASK: RawOpcode = (1 << NUM_BITS) - 1;
+const GROUP_MASK: RawOpcode = (1 << GROUP_BITS) - 1;
+const SIZE_MASK: RawOpcode = (1 << SIZE_BITS) - 1;
+const DIR_MASK: RawOpcode = (1 << DIR_BITS) - 1;
+
+#[cfg(any(
+    target_arch = "x86",
+    target_arch = "arm",
+    target_arch = "s390x",
+    target_arch = "x86_64",
+    target_arch = "aarch64",
+    target_arch = "riscv32",
+    target_arch = "riscv64",
+    target_arch = "loongarch64",
+    target_arch = "csky"
+))]
+mod consts {
+    use super::RawOpcode;
+
+    pub(super) const NONE: RawOpcode = 0;
+    pub(super) const READ: RawOpcode = 2;
+    pub(super) const WRITE: RawOpcode = 1;
+    pub(super) const SIZE_BITS: RawOpcode = 14;
+    pub(super) const DIR_BITS: RawOpcode = 2;
+}
+
+#[cfg(any(
+    target_arch = "mips",
+    target_arch = "mips32r6",
+    target_arch = "mips64",
+    target_arch = "mips64r6",
+    target_arch = "powerpc",
+    target_arch = "powerpc64",
+    target_arch = "sparc",
+    target_arch = "sparc64"
+))]
+mod consts {
+    use super::RawOpcode;
+
+    pub(super) const NONE: RawOpcode = 1;
+    pub(super) const READ: RawOpcode = 2;
+    pub(super) const WRITE: RawOpcode = 4;
+    pub(super) const SIZE_BITS: RawOpcode = 13;
+    pub(super) const DIR_BITS: RawOpcode = 3;
+}
+
+#[cfg(not(any(
+    // These have no ioctl opcodes defined in linux_raw_sys
+    // so can't use that as a known-good value for this test.
+    target_arch = "sparc",
+    target_arch = "sparc64"
+)))]
+#[test]
+fn check_known_opcodes() {
+    use crate::backend::c::{c_long, c_uint};
+    use core::mem::size_of;
+
+    // _IOR('U', 15, unsigned int)
+    assert_eq!(
+        compose_opcode(
+            Direction::Read,
+            b'U' as RawOpcode,
+            15,
+            size_of::<c_uint>() as RawOpcode
+        ),
+        linux_raw_sys::ioctl::USBDEVFS_CLAIMINTERFACE as RawOpcode
+    );
+
+    // _IOW('v', 2, long)
+    assert_eq!(
+        compose_opcode(
+            Direction::Write,
+            b'v' as RawOpcode,
+            2,
+            size_of::<c_long>() as RawOpcode
+        ),
+        linux_raw_sys::ioctl::FS_IOC_SETVERSION as RawOpcode
+    );
+}
diff --git a/vendor/rustix/src/ioctl/mod.rs b/vendor/rustix/src/ioctl/mod.rs
new file mode 100644
index 0000000..494cdc8
--- /dev/null
+++ b/vendor/rustix/src/ioctl/mod.rs
@@ -0,0 +1,357 @@
+//! Unsafe `ioctl` API.
+//!
+//! Unix systems expose a number of `ioctl`'s. `ioctl`s have been adopted as a
+//! general purpose system call for making calls into the kernel. In addition
+//! to the wide variety of system calls that are included by default in the
+//! kernel, many drivers expose their own `ioctl`'s for controlling their
+//! behavior, some of which are proprietary. Therefore it is impossible to make
+//! a safe interface for every `ioctl` call, as they all have wildly varying
+//! semantics.
+//!
+//! This module provides an unsafe interface to write your own `ioctl` API. To
+//! start, create a type that implements [`Ioctl`]. Then, pass it to [`ioctl`]
+//! to make the `ioctl` call.
+
+#![allow(unsafe_code)]
+
+use crate::backend::c;
+use crate::fd::{AsFd, BorrowedFd};
+use crate::io::Result;
+
+#[cfg(any(linux_kernel, bsd))]
+use core::mem;
+
+pub use patterns::*;
+
+mod patterns;
+
+#[cfg(linux_kernel)]
+mod linux;
+
+#[cfg(bsd)]
+mod bsd;
+
+#[cfg(linux_kernel)]
+use linux as platform;
+
+#[cfg(bsd)]
+use bsd as platform;
+
+/// Perform an `ioctl` call.
+///
+/// `ioctl` was originally intended to act as a way of modifying the behavior
+/// of files, but has since been adopted as a general purpose system call for
+/// making calls into the kernel. In addition to the default calls exposed by
+/// generic file descriptors, many drivers expose their own `ioctl` calls for
+/// controlling their behavior, some of which are proprietary.
+///
+/// This crate exposes many other `ioctl` interfaces with safe and idiomatic
+/// wrappers, like [`ioctl_fionbio`] and [`ioctl_fionread`]. It is recommended
+/// to use those instead of this function, as they are safer and more
+/// idiomatic. For other cases, implement the [`Ioctl`] API and pass it to this
+/// function.
+///
+/// See documentation for [`Ioctl`] for more information.
+///
+/// [`ioctl_fionbio`]: crate::io::ioctl_fionbio
+/// [`ioctl_fionread`]: crate::io::ioctl_fionread
+///
+/// # Safety
+///
+/// While [`Ioctl`] takes much of the unsafety out of `ioctl` calls, it is
+/// still unsafe to call this code with arbitrary device drivers, as it is up
+/// to the device driver to implement the `ioctl` call correctly. It is on the
+/// onus of the protocol between the user and the driver to ensure that the
+/// `ioctl` call is safe to make.
+///
+/// # References
+///  - [Linux]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [Apple]
+///  - [Solaris]
+///  - [illumos]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/ioctl.2.html
+/// [Winsock]: https://learn.microsoft.com/en-us/windows/win32/api/winsock/nf-winsock-ioctlsocket
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=ioctl&sektion=2
+/// [NetBSD]: https://man.netbsd.org/ioctl.2
+/// [OpenBSD]: https://man.openbsd.org/ioctl.2
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/ioctl.2.html
+/// [Solaris]: https://docs.oracle.com/cd/E23824_01/html/821-1463/ioctl-2.html
+/// [illumos]: https://illumos.org/man/2/ioctl
+#[inline]
+pub unsafe fn ioctl<F: AsFd, I: Ioctl>(fd: F, mut ioctl: I) -> Result<I::Output> {
+    let fd = fd.as_fd();
+    let request = I::OPCODE.raw();
+    let arg = ioctl.as_ptr();
+
+    // SAFETY: The variant of `Ioctl` asserts that this is a valid IOCTL call
+    // to make.
+    let output = if I::IS_MUTATING {
+        _ioctl(fd, request, arg)?
+    } else {
+        _ioctl_readonly(fd, request, arg)?
+    };
+
+    // SAFETY: The variant of `Ioctl` asserts that this is a valid pointer to
+    // the output data.
+    I::output_from_ptr(output, arg)
+}
+
+unsafe fn _ioctl(
+    fd: BorrowedFd<'_>,
+    request: RawOpcode,
+    arg: *mut c::c_void,
+) -> Result<IoctlOutput> {
+    crate::backend::io::syscalls::ioctl(fd, request, arg)
+}
+
+unsafe fn _ioctl_readonly(
+    fd: BorrowedFd<'_>,
+    request: RawOpcode,
+    arg: *mut c::c_void,
+) -> Result<IoctlOutput> {
+    crate::backend::io::syscalls::ioctl_readonly(fd, request, arg)
+}
+
+/// A trait defining the properties of an `ioctl` command.
+///
+/// Objects implementing this trait can be passed to [`ioctl`] to make an
+/// `ioctl` call. The contents of the object represent the inputs to the
+/// `ioctl` call. The inputs must be convertible to a pointer through the
+/// `as_ptr` method. In most cases, this involves either casting a number to a
+/// pointer, or creating a pointer to the actual data. The latter case is
+/// necessary for `ioctl` calls that modify userspace data.
+///
+/// # Safety
+///
+/// This trait is unsafe to implement because it is impossible to guarantee
+/// that the `ioctl` call is safe. The `ioctl` call may be proprietary, or it
+/// may be unsafe to call in certain circumstances.
+///
+/// By implementing this trait, you guarantee that:
+///
+/// - The `ioctl` call expects the input provided by `as_ptr` and produces the
+///   output as indicated by `output`.
+/// - That `output_from_ptr` can safely take the pointer from `as_ptr` and cast
+///   it to the correct type, *only* after the `ioctl` call.
+/// - That `OPCODE` uniquely identifies the `ioctl` call.
+/// - That, for whatever platforms you are targeting, the `ioctl` call is safe
+///   to make.
+/// - If `IS_MUTATING` is false, that no userspace data will be modified by the
+///   `ioctl` call.
+pub unsafe trait Ioctl {
+    /// The type of the output data.
+    ///
+    /// Given a pointer, one should be able to construct an instance of this
+    /// type.
+    type Output;
+
+    /// The opcode used by this `ioctl` command.
+    ///
+    /// There are different types of opcode depending on the operation. See
+    /// documentation for the [`Opcode`] struct for more information.
+    const OPCODE: Opcode;
+
+    /// Does the `ioctl` mutate any data in the userspace?
+    ///
+    /// If the `ioctl` call does not mutate any data in the userspace, then
+    /// making this `false` enables optimizations that can make the call
+    /// faster. When in doubt, set this to `true`.
+    ///
+    /// # Safety
+    ///
+    /// This should only be set to `false` if the `ioctl` call does not mutate
+    /// any data in the userspace. Undefined behavior may occur if this is set
+    /// to `false` when it should be `true`.
+    const IS_MUTATING: bool;
+
+    /// Get a pointer to the data to be passed to the `ioctl` command.
+    ///
+    /// See trait-level documentation for more information.
+    fn as_ptr(&mut self) -> *mut c::c_void;
+
+    /// Cast the output data to the correct type.
+    ///
+    /// # Safety
+    ///
+    /// The `extract_output` value must be the resulting value after a
+    /// successful `ioctl` call, and `out` is the direct return value of an
+    /// `ioctl` call that did not fail. In this case `extract_output` is the
+    /// pointer that was passed to the `ioctl` call.
+    unsafe fn output_from_ptr(
+        out: IoctlOutput,
+        extract_output: *mut c::c_void,
+    ) -> Result<Self::Output>;
+}
+
+/// The opcode used by an `Ioctl`.
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct Opcode {
+    /// The raw opcode.
+    raw: RawOpcode,
+}
+
+impl Opcode {
+    /// Create a new old `Opcode` from a raw opcode.
+    ///
+    /// Rather than being a composition of several attributes, old opcodes are
+    /// just numbers. In general most drivers follow stricter conventions, but
+    /// older drivers may still use this strategy.
+    #[inline]
+    pub const fn old(raw: RawOpcode) -> Self {
+        Self { raw }
+    }
+
+    /// Create a new opcode from a direction, group, number, and size.
+    ///
+    /// This corresponds to the C macro `_IOC(direction, group, number, size)`
+    #[cfg(any(linux_kernel, bsd))]
+    #[inline]
+    pub const fn from_components(
+        direction: Direction,
+        group: u8,
+        number: u8,
+        data_size: usize,
+    ) -> Self {
+        if data_size > RawOpcode::MAX as usize {
+            panic!("data size is too large");
+        }
+
+        Self::old(platform::compose_opcode(
+            direction,
+            group as RawOpcode,
+            number as RawOpcode,
+            data_size as RawOpcode,
+        ))
+    }
+
+    /// Create a new non-mutating opcode from a group, a number, and the type
+    /// of data.
+    ///
+    /// This corresponds to the C macro `_IO(group, number)` when `T` is zero
+    /// sized.
+    #[cfg(any(linux_kernel, bsd))]
+    #[inline]
+    pub const fn none<T>(group: u8, number: u8) -> Self {
+        Self::from_components(Direction::None, group, number, mem::size_of::<T>())
+    }
+
+    /// Create a new reading opcode from a group, a number and the type of
+    /// data.
+    ///
+    /// This corresponds to the C macro `_IOR(group, number, T)`.
+    #[cfg(any(linux_kernel, bsd))]
+    #[inline]
+    pub const fn read<T>(group: u8, number: u8) -> Self {
+        Self::from_components(Direction::Read, group, number, mem::size_of::<T>())
+    }
+
+    /// Create a new writing opcode from a group, a number and the type of
+    /// data.
+    ///
+    /// This corresponds to the C macro `_IOW(group, number, T)`.
+    #[cfg(any(linux_kernel, bsd))]
+    #[inline]
+    pub const fn write<T>(group: u8, number: u8) -> Self {
+        Self::from_components(Direction::Write, group, number, mem::size_of::<T>())
+    }
+
+    /// Create a new reading and writing opcode from a group, a number and the
+    /// type of data.
+    ///
+    /// This corresponds to the C macro `_IOWR(group, number, T)`.
+    #[cfg(any(linux_kernel, bsd))]
+    #[inline]
+    pub const fn read_write<T>(group: u8, number: u8) -> Self {
+        Self::from_components(Direction::ReadWrite, group, number, mem::size_of::<T>())
+    }
+
+    /// Get the raw opcode.
+    #[inline]
+    pub fn raw(self) -> RawOpcode {
+        self.raw
+    }
+}
+
+/// The direction that an `ioctl` is going.
+///
+/// Note that this is relative to userspace. `Read` means reading data from the
+/// kernel, and write means the kernel writing data to userspace.
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub enum Direction {
+    /// None of the above.
+    None,
+
+    /// Read data from the kernel.
+    Read,
+
+    /// Write data to the kernel.
+    Write,
+
+    /// Read and write data to the kernel.
+    ReadWrite,
+}
+
+/// The type used by the `ioctl` to signify the output.
+pub type IoctlOutput = c::c_int;
+
+/// The type used by the `ioctl` to signify the command.
+pub type RawOpcode = _RawOpcode;
+
+// Under raw Linux, this is an `unsigned int`.
+#[cfg(linux_raw)]
+type _RawOpcode = c::c_uint;
+
+// On libc Linux with GNU libc or uclibc, this is an `unsigned long`.
+#[cfg(all(
+    not(linux_raw),
+    target_os = "linux",
+    any(target_env = "gnu", target_env = "uclibc")
+))]
+type _RawOpcode = c::c_ulong;
+
+// Musl uses `c_int`.
+#[cfg(all(
+    not(linux_raw),
+    target_os = "linux",
+    not(target_env = "gnu"),
+    not(target_env = "uclibc")
+))]
+type _RawOpcode = c::c_int;
+
+// Android uses `c_int`.
+#[cfg(all(not(linux_raw), target_os = "android"))]
+type _RawOpcode = c::c_int;
+
+// BSD, Haiku, Hurd, Redox, and Vita use `unsigned long`.
+#[cfg(any(
+    bsd,
+    target_os = "redox",
+    target_os = "haiku",
+    target_os = "hurd",
+    target_os = "vita"
+))]
+type _RawOpcode = c::c_ulong;
+
+// AIX, Emscripten, Fuchsia, Solaris, and WASI use a `int`.
+#[cfg(any(
+    solarish,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "emscripten",
+    target_os = "wasi",
+    target_os = "nto"
+))]
+type _RawOpcode = c::c_int;
+
+// ESP-IDF uses a `c_uint`.
+#[cfg(target_os = "espidf")]
+type _RawOpcode = c::c_uint;
+
+// Windows has `ioctlsocket`, which uses `i32`.
+#[cfg(windows)]
+type _RawOpcode = i32;
diff --git a/vendor/rustix/src/ioctl/patterns.rs b/vendor/rustix/src/ioctl/patterns.rs
new file mode 100644
index 0000000..6cf7ebd
--- /dev/null
+++ b/vendor/rustix/src/ioctl/patterns.rs
@@ -0,0 +1,256 @@
+//! Implements typical patterns for `ioctl` usage.
+
+use super::{Ioctl, IoctlOutput, Opcode, RawOpcode};
+
+use crate::backend::c;
+use crate::io::Result;
+
+use core::marker::PhantomData;
+use core::ptr::addr_of_mut;
+use core::{fmt, mem};
+
+/// Implements an `ioctl` with no real arguments.
+pub struct NoArg<Opcode> {
+    /// The opcode.
+    _opcode: PhantomData<Opcode>,
+}
+
+impl<Opcode: CompileTimeOpcode> fmt::Debug for NoArg<Opcode> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_tuple("NoArg").field(&Opcode::OPCODE).finish()
+    }
+}
+
+impl<Opcode: CompileTimeOpcode> NoArg<Opcode> {
+    /// Create a new no-argument `ioctl` object.
+    ///
+    /// # Safety
+    ///
+    /// - `Opcode` must provide a valid opcode.
+    #[inline]
+    pub unsafe fn new() -> Self {
+        Self {
+            _opcode: PhantomData,
+        }
+    }
+}
+
+unsafe impl<Opcode: CompileTimeOpcode> Ioctl for NoArg<Opcode> {
+    type Output = ();
+
+    const IS_MUTATING: bool = false;
+    const OPCODE: self::Opcode = Opcode::OPCODE;
+
+    fn as_ptr(&mut self) -> *mut c::c_void {
+        core::ptr::null_mut()
+    }
+
+    unsafe fn output_from_ptr(_: IoctlOutput, _: *mut c::c_void) -> Result<Self::Output> {
+        Ok(())
+    }
+}
+
+/// Implements the traditional “getter” pattern for `ioctl`s.
+///
+/// Some `ioctl`s just read data into the userspace. As this is a popular
+/// pattern this structure implements it.
+pub struct Getter<Opcode, Output> {
+    /// The output data.
+    output: mem::MaybeUninit<Output>,
+
+    /// The opcode.
+    _opcode: PhantomData<Opcode>,
+}
+
+impl<Opcode: CompileTimeOpcode, Output> fmt::Debug for Getter<Opcode, Output> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_tuple("Getter").field(&Opcode::OPCODE).finish()
+    }
+}
+
+impl<Opcode: CompileTimeOpcode, Output> Getter<Opcode, Output> {
+    /// Create a new getter-style `ioctl` object.
+    ///
+    /// # Safety
+    ///
+    /// - `Opcode` must provide a valid opcode.
+    /// - For this opcode, `Output` must be the type that the kernel expects to
+    ///   write into.
+    #[inline]
+    pub unsafe fn new() -> Self {
+        Self {
+            output: mem::MaybeUninit::uninit(),
+            _opcode: PhantomData,
+        }
+    }
+}
+
+unsafe impl<Opcode: CompileTimeOpcode, Output> Ioctl for Getter<Opcode, Output> {
+    type Output = Output;
+
+    const IS_MUTATING: bool = true;
+    const OPCODE: self::Opcode = Opcode::OPCODE;
+
+    fn as_ptr(&mut self) -> *mut c::c_void {
+        self.output.as_mut_ptr().cast()
+    }
+
+    unsafe fn output_from_ptr(_: IoctlOutput, ptr: *mut c::c_void) -> Result<Self::Output> {
+        Ok(ptr.cast::<Output>().read())
+    }
+}
+
+/// Implements the pattern for `ioctl`s where a pointer argument is given to
+/// the `ioctl`.
+///
+/// The opcode must be read-only.
+pub struct Setter<Opcode, Input> {
+    /// The input data.
+    input: Input,
+
+    /// The opcode.
+    _opcode: PhantomData<Opcode>,
+}
+
+impl<Opcode: CompileTimeOpcode, Input: fmt::Debug> fmt::Debug for Setter<Opcode, Input> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_tuple("Setter")
+            .field(&Opcode::OPCODE)
+            .field(&self.input)
+            .finish()
+    }
+}
+
+impl<Opcode: CompileTimeOpcode, Input> Setter<Opcode, Input> {
+    /// Create a new pointer setter-style `ioctl` object.
+    ///
+    /// # Safety
+    ///
+    /// - `Opcode` must provide a valid opcode.
+    /// - For this opcode, `Input` must be the type that the kernel expects to
+    ///   get.
+    #[inline]
+    pub unsafe fn new(input: Input) -> Self {
+        Self {
+            input,
+            _opcode: PhantomData,
+        }
+    }
+}
+
+unsafe impl<Opcode: CompileTimeOpcode, Input> Ioctl for Setter<Opcode, Input> {
+    type Output = ();
+
+    const IS_MUTATING: bool = false;
+    const OPCODE: self::Opcode = Opcode::OPCODE;
+
+    fn as_ptr(&mut self) -> *mut c::c_void {
+        addr_of_mut!(self.input).cast::<c::c_void>()
+    }
+
+    unsafe fn output_from_ptr(_: IoctlOutput, _: *mut c::c_void) -> Result<Self::Output> {
+        Ok(())
+    }
+}
+
+/// Implements an “updater” pattern for `ioctl`s.
+///
+/// The ioctl takes a reference to a struct that it reads its input from,
+/// then writes output to the same struct.
+pub struct Updater<'a, Opcode, Value> {
+    /// Reference to input/output data.
+    value: &'a mut Value,
+
+    /// The opcode.
+    _opcode: PhantomData<Opcode>,
+}
+
+impl<'a, Opcode: CompileTimeOpcode, Value> Updater<'a, Opcode, Value> {
+    /// Create a new pointer updater-style `ioctl` object.
+    ///
+    /// # Safety
+    ///
+    /// - `Opcode` must provide a valid opcode.
+    /// - For this opcode, `Value` must be the type that the kernel expects to
+    ///   get.
+    #[inline]
+    pub unsafe fn new(value: &'a mut Value) -> Self {
+        Self {
+            value,
+            _opcode: PhantomData,
+        }
+    }
+}
+
+unsafe impl<'a, Opcode: CompileTimeOpcode, T> Ioctl for Updater<'a, Opcode, T> {
+    type Output = ();
+
+    const IS_MUTATING: bool = true;
+    const OPCODE: self::Opcode = Opcode::OPCODE;
+
+    fn as_ptr(&mut self) -> *mut c::c_void {
+        (self.value as *mut T).cast()
+    }
+
+    unsafe fn output_from_ptr(_output: IoctlOutput, _ptr: *mut c::c_void) -> Result<()> {
+        Ok(())
+    }
+}
+
+/// Trait for something that provides an `ioctl` opcode at compile time.
+pub trait CompileTimeOpcode {
+    /// The opcode.
+    const OPCODE: Opcode;
+}
+
+/// Provides a bad opcode at compile time.
+pub struct BadOpcode<const OPCODE: RawOpcode>;
+
+impl<const OPCODE: RawOpcode> CompileTimeOpcode for BadOpcode<OPCODE> {
+    const OPCODE: Opcode = Opcode::old(OPCODE);
+}
+
+/// Provides a read code at compile time.
+///
+/// This corresponds to the C macro `_IOR(GROUP, NUM, Data)`.
+#[cfg(any(linux_kernel, bsd))]
+pub struct ReadOpcode<const GROUP: u8, const NUM: u8, Data>(Data);
+
+#[cfg(any(linux_kernel, bsd))]
+impl<const GROUP: u8, const NUM: u8, Data> CompileTimeOpcode for ReadOpcode<GROUP, NUM, Data> {
+    const OPCODE: Opcode = Opcode::read::<Data>(GROUP, NUM);
+}
+
+/// Provides a write code at compile time.
+///
+/// This corresponds to the C macro `_IOW(GROUP, NUM, Data)`.
+#[cfg(any(linux_kernel, bsd))]
+pub struct WriteOpcode<const GROUP: u8, const NUM: u8, Data>(Data);
+
+#[cfg(any(linux_kernel, bsd))]
+impl<const GROUP: u8, const NUM: u8, Data> CompileTimeOpcode for WriteOpcode<GROUP, NUM, Data> {
+    const OPCODE: Opcode = Opcode::write::<Data>(GROUP, NUM);
+}
+
+/// Provides a read/write code at compile time.
+///
+/// This corresponds to the C macro `_IOWR(GROUP, NUM, Data)`.
+#[cfg(any(linux_kernel, bsd))]
+pub struct ReadWriteOpcode<const GROUP: u8, const NUM: u8, Data>(Data);
+
+#[cfg(any(linux_kernel, bsd))]
+impl<const GROUP: u8, const NUM: u8, Data> CompileTimeOpcode for ReadWriteOpcode<GROUP, NUM, Data> {
+    const OPCODE: Opcode = Opcode::read_write::<Data>(GROUP, NUM);
+}
+
+/// Provides a `None` code at compile time.
+///
+/// This corresponds to the C macro `_IO(GROUP, NUM)` when `Data` is zero
+/// sized.
+#[cfg(any(linux_kernel, bsd))]
+pub struct NoneOpcode<const GROUP: u8, const NUM: u8, Data>(Data);
+
+#[cfg(any(linux_kernel, bsd))]
+impl<const GROUP: u8, const NUM: u8, Data> CompileTimeOpcode for NoneOpcode<GROUP, NUM, Data> {
+    const OPCODE: Opcode = Opcode::none::<Data>(GROUP, NUM);
+}
diff --git a/vendor/rustix/src/lib.rs b/vendor/rustix/src/lib.rs
new file mode 100644
index 0000000..51fbdba
--- /dev/null
+++ b/vendor/rustix/src/lib.rs
@@ -0,0 +1,395 @@
+//! `rustix` provides efficient memory-safe and [I/O-safe] wrappers to
+//! POSIX-like, Unix-like, Linux, and Winsock syscall-like APIs, with
+//! configurable backends.
+//!
+//! With rustix, you can write code like this:
+//!
+//! ```
+//! # #[cfg(feature = "net")]
+//! # fn read(sock: std::net::TcpStream, buf: &mut [u8]) -> std::io::Result<()> {
+//! # use rustix::net::RecvFlags;
+//! let nread: usize = rustix::net::recv(&sock, buf, RecvFlags::PEEK)?;
+//! # let _ = nread;
+//! # Ok(())
+//! # }
+//! ```
+//!
+//! instead of like this:
+//!
+//! ```
+//! # #[cfg(feature = "net")]
+//! # fn read(sock: std::net::TcpStream, buf: &mut [u8]) -> std::io::Result<()> {
+//! # #[cfg(unix)]
+//! # use std::os::unix::io::AsRawFd;
+//! # #[cfg(target_os = "wasi")]
+//! # use std::os::wasi::io::AsRawFd;
+//! # #[cfg(windows)]
+//! # use windows_sys::Win32::Networking::WinSock as libc;
+//! # #[cfg(windows)]
+//! # use std::os::windows::io::AsRawSocket;
+//! # const MSG_PEEK: i32 = libc::MSG_PEEK;
+//! let nread: usize = unsafe {
+//!     #[cfg(any(unix, target_os = "wasi"))]
+//!     let raw = sock.as_raw_fd();
+//!     #[cfg(windows)]
+//!     let raw = sock.as_raw_socket();
+//!     match libc::recv(
+//!         raw as _,
+//!         buf.as_mut_ptr().cast(),
+//!         buf.len().try_into().unwrap_or(i32::MAX as _),
+//!         MSG_PEEK,
+//!     ) {
+//!         -1 => return Err(std::io::Error::last_os_error()),
+//!         nread => nread as usize,
+//!     }
+//! };
+//! # let _ = nread;
+//! # Ok(())
+//! # }
+//! ```
+//!
+//! rustix's APIs perform the following tasks:
+//!  - Error values are translated to [`Result`]s.
+//!  - Buffers are passed as Rust slices.
+//!  - Out-parameters are presented as return values.
+//!  - Path arguments use [`Arg`], so they accept any string type.
+//!  - File descriptors are passed and returned via [`AsFd`] and [`OwnedFd`]
+//!    instead of bare integers, ensuring I/O safety.
+//!  - Constants use `enum`s and [`bitflags`] types, and enable [support for
+//!    externally defined flags].
+//!  - Multiplexed functions (eg. `fcntl`, `ioctl`, etc.) are de-multiplexed.
+//!  - Variadic functions (eg. `openat`, etc.) are presented as non-variadic.
+//!  - Functions that return strings automatically allocate sufficient memory
+//!    and retry the syscall as needed to determine the needed length.
+//!  - Functions and types which need `l` prefixes or `64` suffixes to enable
+//!    large-file support (LFS) are used automatically. File sizes and offsets
+//!    are always presented as `u64` and `i64`.
+//!  - Behaviors that depend on the sizes of C types like `long` are hidden.
+//!  - In some places, more human-friendly and less historical-accident names
+//!    are used (and documentation aliases are used so that the original names
+//!    can still be searched for).
+//!  - Provide y2038 compatibility, on platforms which support this.
+//!  - Correct selected platform bugs, such as behavioral differences when
+//!    running under seccomp.
+//!
+//! Things they don't do include:
+//!  - Detecting whether functions are supported at runtime, except in specific
+//!    cases where new interfaces need to be detected to support y2038 and LFS.
+//!  - Hiding significant differences between platforms.
+//!  - Restricting ambient authorities.
+//!  - Imposing sandboxing features such as filesystem path or network address
+//!    sandboxing.
+//!
+//! See [`cap-std`], [`system-interface`], and [`io-streams`] for libraries
+//! which do hide significant differences between platforms, and [`cap-std`]
+//! which does perform sandboxing and restricts ambient authorities.
+//!
+//! [`cap-std`]: https://crates.io/crates/cap-std
+//! [`system-interface`]: https://crates.io/crates/system-interface
+//! [`io-streams`]: https://crates.io/crates/io-streams
+//! [`getrandom`]: https://crates.io/crates/getrandom
+//! [`bitflags`]: https://crates.io/crates/bitflags
+//! [`AsFd`]: https://doc.rust-lang.org/stable/std/os/fd/trait.AsFd.html
+//! [`OwnedFd`]: https://doc.rust-lang.org/stable/std/os/fd/struct.OwnedFd.html
+//! [I/O-safe]: https://github.com/rust-lang/rfcs/blob/master/text/3128-io-safety.md
+//! [`Result`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html
+//! [`Arg`]: https://docs.rs/rustix/*/rustix/path/trait.Arg.html
+//! [support for externally defined flags]: https://docs.rs/bitflags/*/bitflags/#externally-defined-flags
+
+#![deny(missing_docs)]
+#![allow(stable_features)]
+#![cfg_attr(linux_raw, deny(unsafe_code))]
+#![cfg_attr(rustc_attrs, feature(rustc_attrs))]
+#![cfg_attr(doc_cfg, feature(doc_cfg))]
+#![cfg_attr(all(wasi_ext, target_os = "wasi", feature = "std"), feature(wasi_ext))]
+#![cfg_attr(core_ffi_c, feature(core_ffi_c))]
+#![cfg_attr(core_c_str, feature(core_c_str))]
+#![cfg_attr(all(feature = "alloc", alloc_c_string), feature(alloc_c_string))]
+#![cfg_attr(all(feature = "alloc", alloc_ffi), feature(alloc_ffi))]
+#![cfg_attr(not(feature = "std"), no_std)]
+#![cfg_attr(feature = "rustc-dep-of-std", feature(ip))]
+#![cfg_attr(feature = "rustc-dep-of-std", allow(internal_features))]
+#![cfg_attr(
+    any(feature = "rustc-dep-of-std", core_intrinsics),
+    feature(core_intrinsics)
+)]
+#![cfg_attr(asm_experimental_arch, feature(asm_experimental_arch))]
+#![cfg_attr(not(feature = "all-apis"), allow(dead_code))]
+// It is common in Linux and libc APIs for types to vary between platforms.
+#![allow(clippy::unnecessary_cast)]
+// It is common in Linux and libc APIs for types to vary between platforms.
+#![allow(clippy::useless_conversion)]
+// Redox and WASI have enough differences that it isn't worth precisely
+// conditionalizing all the `use`s for them. Similar for if we don't have
+// "all-apis".
+#![cfg_attr(
+    any(target_os = "redox", target_os = "wasi", not(feature = "all-apis")),
+    allow(unused_imports)
+)]
+
+#[cfg(all(feature = "alloc", not(feature = "rustc-dep-of-std")))]
+extern crate alloc;
+
+// Use `static_assertions` macros if we have them, or a polyfill otherwise.
+#[cfg(all(test, static_assertions))]
+#[macro_use]
+#[allow(unused_imports)]
+extern crate static_assertions;
+#[cfg(all(test, not(static_assertions)))]
+#[macro_use]
+#[allow(unused_imports)]
+mod static_assertions;
+
+// Internal utilities.
+mod buffer;
+#[cfg(not(windows))]
+#[macro_use]
+pub(crate) mod cstr;
+#[macro_use]
+pub(crate) mod utils;
+// Polyfill for `std` in `no_std` builds.
+#[cfg_attr(feature = "std", path = "maybe_polyfill/std/mod.rs")]
+#[cfg_attr(not(feature = "std"), path = "maybe_polyfill/no_std/mod.rs")]
+pub(crate) mod maybe_polyfill;
+#[cfg(test)]
+#[macro_use]
+pub(crate) mod check_types;
+#[macro_use]
+pub(crate) mod bitcast;
+
+// linux_raw: Weak symbols are used by the use-libc-auxv feature for
+// glibc 2.15 support.
+//
+// libc: Weak symbols are used to call various functions available in some
+// versions of libc and not others.
+#[cfg(any(
+    all(linux_raw, feature = "use-libc-auxv"),
+    all(libc, not(any(windows, target_os = "espidf", target_os = "wasi")))
+))]
+#[macro_use]
+mod weak;
+
+// Pick the backend implementation to use.
+#[cfg_attr(libc, path = "backend/libc/mod.rs")]
+#[cfg_attr(linux_raw, path = "backend/linux_raw/mod.rs")]
+#[cfg_attr(wasi, path = "backend/wasi/mod.rs")]
+mod backend;
+
+/// Export the `*Fd` types and traits that are used in rustix's public API.
+///
+/// Users can use this to avoid needing to import anything else to use the same
+/// versions of these types and traits.
+pub mod fd {
+    use super::backend;
+
+    // Re-export `AsSocket` etc. too, as users can't implement `AsFd` etc. on
+    // Windows due to them having blanket impls on Windows, so users must
+    // implement `AsSocket` etc.
+    #[cfg(windows)]
+    pub use backend::fd::{AsRawSocket, AsSocket, FromRawSocket, IntoRawSocket};
+
+    pub use backend::fd::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd};
+}
+
+// The public API modules.
+#[cfg(feature = "event")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "event")))]
+pub mod event;
+#[cfg(not(windows))]
+pub mod ffi;
+#[cfg(not(windows))]
+#[cfg(feature = "fs")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "fs")))]
+pub mod fs;
+pub mod io;
+#[cfg(linux_kernel)]
+#[cfg(feature = "io_uring")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "io_uring")))]
+pub mod io_uring;
+pub mod ioctl;
+#[cfg(not(any(windows, target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+#[cfg(feature = "mm")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "mm")))]
+pub mod mm;
+#[cfg(linux_kernel)]
+#[cfg(feature = "mount")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "mount")))]
+pub mod mount;
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+#[cfg(feature = "net")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "net")))]
+pub mod net;
+#[cfg(not(any(windows, target_os = "espidf")))]
+#[cfg(feature = "param")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "param")))]
+pub mod param;
+#[cfg(not(windows))]
+#[cfg(any(feature = "fs", feature = "mount", feature = "net"))]
+#[cfg_attr(
+    doc_cfg,
+    doc(cfg(any(feature = "fs", feature = "mount", feature = "net")))
+)]
+pub mod path;
+#[cfg(feature = "pipe")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "pipe")))]
+#[cfg(not(any(windows, target_os = "wasi")))]
+pub mod pipe;
+#[cfg(not(windows))]
+#[cfg(feature = "process")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "process")))]
+pub mod process;
+#[cfg(feature = "procfs")]
+#[cfg(linux_kernel)]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "procfs")))]
+pub mod procfs;
+#[cfg(not(windows))]
+#[cfg(not(target_os = "wasi"))]
+#[cfg(feature = "pty")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "pty")))]
+pub mod pty;
+#[cfg(not(windows))]
+#[cfg(feature = "rand")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "rand")))]
+pub mod rand;
+#[cfg(not(any(
+    windows,
+    target_os = "android",
+    target_os = "espidf",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[cfg(feature = "shm")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "shm")))]
+pub mod shm;
+#[cfg(not(windows))]
+#[cfg(feature = "stdio")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "stdio")))]
+pub mod stdio;
+#[cfg(feature = "system")]
+#[cfg(not(any(windows, target_os = "wasi")))]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "system")))]
+pub mod system;
+#[cfg(not(any(windows, target_os = "vita")))]
+#[cfg(feature = "termios")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "termios")))]
+pub mod termios;
+#[cfg(not(windows))]
+#[cfg(feature = "thread")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "thread")))]
+pub mod thread;
+#[cfg(not(any(windows, target_os = "espidf")))]
+#[cfg(feature = "time")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "time")))]
+pub mod time;
+
+// "runtime" is also a public API module, but it's only for libc-like users.
+#[cfg(not(windows))]
+#[cfg(feature = "runtime")]
+#[cfg(linux_raw)]
+#[cfg_attr(not(document_experimental_runtime_api), doc(hidden))]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "runtime")))]
+pub mod runtime;
+
+// Temporarily provide some mount functions for use in the fs module for
+// backwards compatibility.
+#[cfg(linux_kernel)]
+#[cfg(all(feature = "fs", not(feature = "mount")))]
+pub(crate) mod mount;
+
+// Declare "fs" as a non-public module if "fs" isn't enabled but we need it for
+// reading procfs.
+#[cfg(not(windows))]
+#[cfg(not(feature = "fs"))]
+#[cfg(all(
+    linux_raw,
+    not(feature = "use-libc-auxv"),
+    not(feature = "use-explicitly-provided-auxv"),
+    any(
+        feature = "param",
+        feature = "process",
+        feature = "runtime",
+        feature = "time",
+        target_arch = "x86",
+    )
+))]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "fs")))]
+pub(crate) mod fs;
+
+// Similarly, declare `path` as a non-public module if needed.
+#[cfg(not(windows))]
+#[cfg(not(any(feature = "fs", feature = "mount", feature = "net")))]
+#[cfg(all(
+    linux_raw,
+    not(feature = "use-libc-auxv"),
+    not(feature = "use-explicitly-provided-auxv"),
+    any(
+        feature = "param",
+        feature = "process",
+        feature = "runtime",
+        feature = "time",
+        target_arch = "x86",
+    )
+))]
+pub(crate) mod path;
+
+// Private modules used by multiple public modules.
+#[cfg(not(any(windows, target_os = "espidf")))]
+#[cfg(any(feature = "thread", feature = "time", target_arch = "x86"))]
+mod clockid;
+#[cfg(not(any(windows, target_os = "wasi")))]
+#[cfg(any(
+    feature = "procfs",
+    feature = "process",
+    feature = "runtime",
+    feature = "termios",
+    feature = "thread",
+    all(bsd, feature = "event"),
+    all(linux_kernel, feature = "net")
+))]
+mod pid;
+#[cfg(any(feature = "process", feature = "thread"))]
+#[cfg(linux_kernel)]
+mod prctl;
+#[cfg(not(any(windows, target_os = "espidf", target_os = "wasi")))]
+#[cfg(any(feature = "process", feature = "runtime", all(bsd, feature = "event")))]
+mod signal;
+#[cfg(not(windows))]
+#[cfg(any(
+    feature = "fs",
+    feature = "process",
+    feature = "runtime",
+    feature = "thread",
+    feature = "time",
+    all(
+        linux_raw,
+        not(feature = "use-libc-auxv"),
+        not(feature = "use-explicitly-provided-auxv"),
+        any(
+            feature = "param",
+            feature = "process",
+            feature = "runtime",
+            feature = "time",
+            target_arch = "x86",
+        )
+    )
+))]
+mod timespec;
+#[cfg(not(any(windows, target_os = "wasi")))]
+#[cfg(any(
+    feature = "fs",
+    feature = "process",
+    feature = "thread",
+    all(
+        linux_raw,
+        not(feature = "use-libc-auxv"),
+        not(feature = "use-explicitly-provided-auxv"),
+        any(
+            feature = "param",
+            feature = "runtime",
+            feature = "time",
+            target_arch = "x86",
+        )
+    ),
+    all(linux_kernel, feature = "net")
+))]
+mod ugid;
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/io/mod.rs b/vendor/rustix/src/maybe_polyfill/no_std/io/mod.rs
new file mode 100644
index 0000000..f0ad750
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/io/mod.rs
@@ -0,0 +1,107 @@
+//! The following is derived from Rust's
+//! library/std/src/sys/unix/io.rs
+//! dca3f1b786efd27be3b325ed1e01e247aa589c3b.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+
+#![allow(unsafe_code)]
+use crate::backend::c;
+#[cfg(not(linux_raw))]
+use c::size_t as __kernel_size_t;
+use core::marker::PhantomData;
+use core::slice;
+#[cfg(linux_raw)]
+use linux_raw_sys::general::__kernel_size_t;
+
+/// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html>
+#[derive(Copy, Clone)]
+#[repr(transparent)]
+pub struct IoSlice<'a> {
+    vec: c::iovec,
+    _p: PhantomData<&'a [u8]>,
+}
+
+impl<'a> IoSlice<'a> {
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.new>
+    #[inline]
+    pub fn new(buf: &'a [u8]) -> IoSlice<'a> {
+        IoSlice {
+            vec: c::iovec {
+                iov_base: buf.as_ptr() as *mut u8 as *mut c::c_void,
+                iov_len: buf.len() as _,
+            },
+            _p: PhantomData,
+        }
+    }
+
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.advance>
+    #[inline]
+    pub fn advance(&mut self, n: usize) {
+        if self.vec.iov_len < n as _ {
+            panic!("advancing IoSlice beyond its length");
+        }
+
+        unsafe {
+            // `__kernel_size_t` will always have the same size as `usize`, but it is a `u32` on
+            // 32-bit platforms and `u64` on 64-bit platforms when using `linux_raw` backend
+            self.vec.iov_len -= n as __kernel_size_t;
+            self.vec.iov_base = self.vec.iov_base.add(n);
+        }
+    }
+
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.as_slice>
+    #[inline]
+    pub fn as_slice(&self) -> &[u8] {
+        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len as usize) }
+    }
+}
+
+/// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html>
+#[repr(transparent)]
+pub struct IoSliceMut<'a> {
+    vec: c::iovec,
+    _p: PhantomData<&'a mut [u8]>,
+}
+
+impl<'a> IoSliceMut<'a> {
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.new>
+    #[inline]
+    pub fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> {
+        IoSliceMut {
+            vec: c::iovec {
+                iov_base: buf.as_mut_ptr() as *mut c::c_void,
+                iov_len: buf.len() as _,
+            },
+            _p: PhantomData,
+        }
+    }
+
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.advance>
+    #[inline]
+    pub fn advance(&mut self, n: usize) {
+        if self.vec.iov_len < n as _ {
+            panic!("advancing IoSliceMut beyond its length");
+        }
+
+        unsafe {
+            // `__kernel_size_t` will always have the same size as `usize`, but it is a `u32` on
+            // 32-bit platforms and `u64` on 64-bit platforms when using `linux_raw` backend
+            self.vec.iov_len -= n as __kernel_size_t;
+            self.vec.iov_base = self.vec.iov_base.add(n);
+        }
+    }
+
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.as_slice>
+    #[inline]
+    pub fn as_slice(&self) -> &[u8] {
+        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len as usize) }
+    }
+
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.as_slice_mut>
+    #[inline]
+    pub fn as_mut_slice(&mut self) -> &mut [u8] {
+        unsafe {
+            slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len as usize)
+        }
+    }
+}
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/mod.rs b/vendor/rustix/src/maybe_polyfill/no_std/mod.rs
new file mode 100644
index 0000000..84bf5b7
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/mod.rs
@@ -0,0 +1,16 @@
+//! Polyfill of parts of the standard library for `no_std` builds.
+//!
+//! All code in this subtree is derived from the standard library and licensed
+//! MIT or Apache 2.0 at your option.
+//!
+//! This implementation is used when `std` is not available and polyfills the
+//! necessary items from `std`. When the `std` feature is specified (so the
+//! standard library is available), the file `src/polyfill/std` is used
+//! instead, which just imports the respective items from `std`.
+
+#[cfg(not(windows))]
+pub mod io;
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+#[cfg(feature = "net")]
+pub mod net;
+pub mod os;
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/net/ip_addr.rs b/vendor/rustix/src/maybe_polyfill/no_std/net/ip_addr.rs
new file mode 100644
index 0000000..81415e9
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/net/ip_addr.rs
@@ -0,0 +1,2068 @@
+//! The following is derived from Rust's
+//! library/std/src/net/ip_addr.rs at revision
+//! bd20fc1fd657b32f7aa1d70d8723f04c87f21606.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+//!
+//! This defines `IpAddr`, `Ipv4Addr`, and `Ipv6Addr`. Ideally, these should be
+//! defined in `core`. See [RFC 2832].
+//!
+//! [RFC 2832]: https://github.com/rust-lang/rfcs/pull/2832
+
+#![allow(unsafe_code)]
+
+use core::cmp::Ordering;
+use core::mem::transmute;
+
+/// An IP address, either IPv4 or IPv6.
+///
+/// This enum can contain either an [`Ipv4Addr`] or an [`Ipv6Addr`], see their
+/// respective documentation for more details.
+///
+/// # Examples
+///
+/// ```
+/// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+///
+/// let localhost_v4 = IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1));
+/// let localhost_v6 = IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
+///
+/// assert_eq!("127.0.0.1".parse(), Ok(localhost_v4));
+/// assert_eq!("::1".parse(), Ok(localhost_v6));
+///
+/// assert_eq!(localhost_v4.is_ipv6(), false);
+/// assert_eq!(localhost_v4.is_ipv4(), true);
+/// ```
+#[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))]
+#[derive(Copy, Clone, Eq, PartialEq, Hash, PartialOrd, Ord)]
+pub enum IpAddr {
+    /// An IPv4 address.
+    #[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))]
+    V4(#[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))] Ipv4Addr),
+    /// An IPv6 address.
+    #[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))]
+    V6(#[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))] Ipv6Addr),
+}
+
+/// An IPv4 address.
+///
+/// IPv4 addresses are defined as 32-bit integers in [IETF RFC 791].
+/// They are usually represented as four octets.
+///
+/// See [`IpAddr`] for a type encompassing both IPv4 and IPv6 addresses.
+///
+/// [IETF RFC 791]: https://tools.ietf.org/html/rfc791
+///
+/// # Textual representation
+///
+/// `Ipv4Addr` provides a [`FromStr`] implementation. The four octets are in decimal
+/// notation, divided by `.` (this is called "dot-decimal notation").
+/// Notably, octal numbers (which are indicated with a leading `0`) and hexadecimal numbers (which
+/// are indicated with a leading `0x`) are not allowed per [IETF RFC 6943].
+///
+/// [IETF RFC 6943]: https://tools.ietf.org/html/rfc6943#section-3.1.1
+/// [`FromStr`]: core::str::FromStr
+///
+/// # Examples
+///
+/// ```
+/// use std::net::Ipv4Addr;
+///
+/// let localhost = Ipv4Addr::new(127, 0, 0, 1);
+/// assert_eq!("127.0.0.1".parse(), Ok(localhost));
+/// assert_eq!(localhost.is_loopback(), true);
+/// assert!("012.004.002.000".parse::<Ipv4Addr>().is_err()); // all octets are in octal
+/// assert!("0000000.0.0.0".parse::<Ipv4Addr>().is_err()); // first octet is a zero in octal
+/// assert!("0xcb.0x0.0x71.0x00".parse::<Ipv4Addr>().is_err()); // all octets are in hex
+/// ```
+#[derive(Copy, Clone, PartialEq, Eq, Hash)]
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub struct Ipv4Addr {
+    octets: [u8; 4],
+}
+
+/// An IPv6 address.
+///
+/// IPv6 addresses are defined as 128-bit integers in [IETF RFC 4291].
+/// They are usually represented as eight 16-bit segments.
+///
+/// [IETF RFC 4291]: https://tools.ietf.org/html/rfc4291
+///
+/// # Embedding IPv4 Addresses
+///
+/// See [`IpAddr`] for a type encompassing both IPv4 and IPv6 addresses.
+///
+/// To assist in the transition from IPv4 to IPv6 two types of IPv6 addresses that embed an IPv4 address were defined:
+/// IPv4-compatible and IPv4-mapped addresses. Of these IPv4-compatible addresses have been officially deprecated.
+///
+/// Both types of addresses are not assigned any special meaning by this implementation,
+/// other than what the relevant standards prescribe. This means that an address like `::ffff:127.0.0.1`,
+/// while representing an IPv4 loopback address, is not itself an IPv6 loopback address; only `::1` is.
+/// To handle these so called "IPv4-in-IPv6" addresses, they have to first be converted to their canonical IPv4 address.
+///
+/// ### IPv4-Compatible IPv6 Addresses
+///
+/// IPv4-compatible IPv6 addresses are defined in [IETF RFC 4291 Section 2.5.5.1], and have been officially deprecated.
+/// The RFC describes the format of an "IPv4-Compatible IPv6 address" as follows:
+///
+/// ```text
+/// |                80 bits               | 16 |      32 bits        |
+/// +--------------------------------------+--------------------------+
+/// |0000..............................0000|0000|    IPv4 address     |
+/// +--------------------------------------+----+---------------------+
+/// ```
+/// So `::a.b.c.d` would be an IPv4-compatible IPv6 address representing the IPv4 address `a.b.c.d`.
+///
+/// To convert from an IPv4 address to an IPv4-compatible IPv6 address, use [`Ipv4Addr::to_ipv6_compatible`].
+/// Use [`Ipv6Addr::to_ipv4`] to convert an IPv4-compatible IPv6 address to the canonical IPv4 address.
+///
+/// [IETF RFC 4291 Section 2.5.5.1]: https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.5.1
+///
+/// ### IPv4-Mapped IPv6 Addresses
+///
+/// IPv4-mapped IPv6 addresses are defined in [IETF RFC 4291 Section 2.5.5.2].
+/// The RFC describes the format of an "IPv4-Mapped IPv6 address" as follows:
+///
+/// ```text
+/// |                80 bits               | 16 |      32 bits        |
+/// +--------------------------------------+--------------------------+
+/// |0000..............................0000|FFFF|    IPv4 address     |
+/// +--------------------------------------+----+---------------------+
+/// ```
+/// So `::ffff:a.b.c.d` would be an IPv4-mapped IPv6 address representing the IPv4 address `a.b.c.d`.
+///
+/// To convert from an IPv4 address to an IPv4-mapped IPv6 address, use [`Ipv4Addr::to_ipv6_mapped`].
+/// Use [`Ipv6Addr::to_ipv4`] to convert an IPv4-mapped IPv6 address to the canonical IPv4 address.
+/// Note that this will also convert the IPv6 loopback address `::1` to `0.0.0.1`. Use
+/// [`Ipv6Addr::to_ipv4_mapped`] to avoid this.
+///
+/// [IETF RFC 4291 Section 2.5.5.2]: https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.5.2
+///
+/// # Textual representation
+///
+/// `Ipv6Addr` provides a [`FromStr`] implementation. There are many ways to represent
+/// an IPv6 address in text, but in general, each segments is written in hexadecimal
+/// notation, and segments are separated by `:`. For more information, see
+/// [IETF RFC 5952].
+///
+/// [`FromStr`]: core::str::FromStr
+/// [IETF RFC 5952]: https://tools.ietf.org/html/rfc5952
+///
+/// # Examples
+///
+/// ```
+/// use std::net::Ipv6Addr;
+///
+/// let localhost = Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1);
+/// assert_eq!("::1".parse(), Ok(localhost));
+/// assert_eq!(localhost.is_loopback(), true);
+/// ```
+#[derive(Copy, Clone, PartialEq, Eq, Hash)]
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub struct Ipv6Addr {
+    octets: [u8; 16],
+}
+
+/// Scope of an [IPv6 multicast address] as defined in [IETF RFC 7346 section 2].
+///
+/// # Stability Guarantees
+///
+/// Not all possible values for a multicast scope have been assigned.
+/// Future RFCs may introduce new scopes, which will be added as variants to this enum;
+/// because of this the enum is marked as `#[non_exhaustive]`.
+///
+/// # Examples
+/// ```
+/// #![feature(ip)]
+///
+/// use std::net::Ipv6Addr;
+/// use std::net::Ipv6MulticastScope::*;
+///
+/// // An IPv6 multicast address with global scope (`ff0e::`).
+/// let address = Ipv6Addr::new(0xff0e, 0, 0, 0, 0, 0, 0, 0);
+///
+/// // Will print "Global scope".
+/// match address.multicast_scope() {
+///     Some(InterfaceLocal) => println!("Interface-Local scope"),
+///     Some(LinkLocal) => println!("Link-Local scope"),
+///     Some(RealmLocal) => println!("Realm-Local scope"),
+///     Some(AdminLocal) => println!("Admin-Local scope"),
+///     Some(SiteLocal) => println!("Site-Local scope"),
+///     Some(OrganizationLocal) => println!("Organization-Local scope"),
+///     Some(Global) => println!("Global scope"),
+///     Some(_) => println!("Unknown scope"),
+///     None => println!("Not a multicast address!")
+/// }
+///
+/// ```
+///
+/// [IPv6 multicast address]: Ipv6Addr
+/// [IETF RFC 7346 section 2]: https://tools.ietf.org/html/rfc7346#section-2
+#[derive(Copy, PartialEq, Eq, Clone, Hash, Debug)]
+#[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+#[non_exhaustive]
+pub enum Ipv6MulticastScope {
+    /// Interface-Local scope.
+    InterfaceLocal,
+    /// Link-Local scope.
+    LinkLocal,
+    /// Realm-Local scope.
+    RealmLocal,
+    /// Admin-Local scope.
+    AdminLocal,
+    /// Site-Local scope.
+    SiteLocal,
+    /// Organization-Local scope.
+    OrganizationLocal,
+    /// Global scope.
+    Global,
+}
+
+impl IpAddr {
+    /// Returns [`true`] for the special 'unspecified' address.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_unspecified()`] and
+    /// [`Ipv6Addr::is_unspecified()`] for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)).is_unspecified(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0)).is_unspecified(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ip_shared", since = "1.12.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_unspecified(&self) -> bool {
+        match self {
+            IpAddr::V4(ip) => ip.is_unspecified(),
+            IpAddr::V6(ip) => ip.is_unspecified(),
+        }
+    }
+
+    /// Returns [`true`] if this is a loopback address.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_loopback()`] and
+    /// [`Ipv6Addr::is_loopback()`] for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)).is_loopback(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0x1)).is_loopback(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ip_shared", since = "1.12.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_loopback(&self) -> bool {
+        match self {
+            IpAddr::V4(ip) => ip.is_loopback(),
+            IpAddr::V6(ip) => ip.is_loopback(),
+        }
+    }
+
+    /// Returns [`true`] if the address appears to be globally routable.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_global()`] and
+    /// [`Ipv6Addr::is_global()`] for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(80, 9, 12, 3)).is_global(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0, 0, 0x1c9, 0, 0, 0xafc8, 0, 0x1)).is_global(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ip", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_global(&self) -> bool {
+        match self {
+            IpAddr::V4(ip) => ip.is_global(),
+            IpAddr::V6(ip) => ip.is_global(),
+        }
+    }
+
+    /// Returns [`true`] if this is a multicast address.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_multicast()`] and
+    /// [`Ipv6Addr::is_multicast()`] for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(224, 254, 0, 0)).is_multicast(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0)).is_multicast(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ip_shared", since = "1.12.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_multicast(&self) -> bool {
+        match self {
+            IpAddr::V4(ip) => ip.is_multicast(),
+            IpAddr::V6(ip) => ip.is_multicast(),
+        }
+    }
+
+    /// Returns [`true`] if this address is in a range designated for documentation.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_documentation()`] and
+    /// [`Ipv6Addr::is_documentation()`] for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(203, 0, 113, 6)).is_documentation(), true);
+    /// assert_eq!(
+    ///     IpAddr::V6(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0)).is_documentation(),
+    ///     true
+    /// );
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ip", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_documentation(&self) -> bool {
+        match self {
+            IpAddr::V4(ip) => ip.is_documentation(),
+            IpAddr::V6(ip) => ip.is_documentation(),
+        }
+    }
+
+    /// Returns [`true`] if this address is in a range designated for benchmarking.
+    ///
+    /// See the documentation for [`Ipv4Addr::is_benchmarking()`] and
+    /// [`Ipv6Addr::is_benchmarking()`] for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(198, 19, 255, 255)).is_benchmarking(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0x2001, 0x2, 0, 0, 0, 0, 0, 0)).is_benchmarking(), true);
+    /// ```
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_benchmarking(&self) -> bool {
+        match self {
+            IpAddr::V4(ip) => ip.is_benchmarking(),
+            IpAddr::V6(ip) => ip.is_benchmarking(),
+        }
+    }
+
+    /// Returns [`true`] if this address is an [`IPv4` address], and [`false`]
+    /// otherwise.
+    ///
+    /// [`IPv4` address]: IpAddr::V4
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(203, 0, 113, 6)).is_ipv4(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0)).is_ipv4(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ipaddr_checker", since = "1.16.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_ipv4(&self) -> bool {
+        matches!(self, IpAddr::V4(_))
+    }
+
+    /// Returns [`true`] if this address is an [`IPv6` address], and [`false`]
+    /// otherwise.
+    ///
+    /// [`IPv6` address]: IpAddr::V6
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(203, 0, 113, 6)).is_ipv6(), false);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0)).is_ipv6(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ipaddr_checker", since = "1.16.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_ipv6(&self) -> bool {
+        matches!(self, IpAddr::V6(_))
+    }
+
+    /// Converts this address to an `IpAddr::V4` if it is an IPv4-mapped IPv6 addresses, otherwise it
+    /// return `self` as-is.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    /// use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)).to_canonical().is_loopback(), true);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x7f00, 0x1)).is_loopback(), false);
+    /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x7f00, 0x1)).to_canonical().is_loopback(), true);
+    /// ```
+    #[inline]
+    #[must_use = "this returns the result of the operation, \
+                  without modifying the original"]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ip", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    pub const fn to_canonical(&self) -> IpAddr {
+        match self {
+            &v4 @ IpAddr::V4(_) => v4,
+            IpAddr::V6(v6) => v6.to_canonical(),
+        }
+    }
+}
+
+impl Ipv4Addr {
+    /// Creates a new IPv4 address from four eight-bit octets.
+    ///
+    /// The result will represent the IP address `a`.`b`.`c`.`d`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::new(127, 0, 0, 1);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_32", since = "1.32.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn new(a: u8, b: u8, c: u8, d: u8) -> Ipv4Addr {
+        Ipv4Addr {
+            octets: [a, b, c, d],
+        }
+    }
+
+    /// An IPv4 address with the address pointing to localhost: `127.0.0.1`
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::LOCALHOST;
+    /// assert_eq!(addr, Ipv4Addr::new(127, 0, 0, 1));
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "ip_constructors", since = "1.30.0"))]
+    pub const LOCALHOST: Self = Ipv4Addr::new(127, 0, 0, 1);
+
+    /// An IPv4 address representing an unspecified address: `0.0.0.0`
+    ///
+    /// This corresponds to the constant `INADDR_ANY` in other languages.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::UNSPECIFIED;
+    /// assert_eq!(addr, Ipv4Addr::new(0, 0, 0, 0));
+    /// ```
+    #[doc(alias = "INADDR_ANY")]
+    #[cfg_attr(staged_api, stable(feature = "ip_constructors", since = "1.30.0"))]
+    pub const UNSPECIFIED: Self = Ipv4Addr::new(0, 0, 0, 0);
+
+    /// An IPv4 address representing the broadcast address: `255.255.255.255`
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::BROADCAST;
+    /// assert_eq!(addr, Ipv4Addr::new(255, 255, 255, 255));
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "ip_constructors", since = "1.30.0"))]
+    pub const BROADCAST: Self = Ipv4Addr::new(255, 255, 255, 255);
+
+    /// Returns the four eight-bit integers that make up this address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::new(127, 0, 0, 1);
+    /// assert_eq!(addr.octets(), [127, 0, 0, 1]);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn octets(&self) -> [u8; 4] {
+        self.octets
+    }
+
+    /// Returns [`true`] for the special 'unspecified' address (`0.0.0.0`).
+    ///
+    /// This property is defined in _UNIX Network Programming, Second Edition_,
+    /// W. Richard Stevens, p. 891; see also [ip7].
+    ///
+    /// [ip7]: https://man7.org/linux/man-pages/man7/ip.7.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(0, 0, 0, 0).is_unspecified(), true);
+    /// assert_eq!(Ipv4Addr::new(45, 22, 13, 197).is_unspecified(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_32", since = "1.32.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ip_shared", since = "1.12.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_unspecified(&self) -> bool {
+        u32::from_be_bytes(self.octets) == 0
+    }
+
+    /// Returns [`true`] if this is a loopback address (`127.0.0.0/8`).
+    ///
+    /// This property is defined by [IETF RFC 1122].
+    ///
+    /// [IETF RFC 1122]: https://tools.ietf.org/html/rfc1122
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(127, 0, 0, 1).is_loopback(), true);
+    /// assert_eq!(Ipv4Addr::new(45, 22, 13, 197).is_loopback(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_loopback(&self) -> bool {
+        self.octets()[0] == 127
+    }
+
+    /// Returns [`true`] if this is a private address.
+    ///
+    /// The private address ranges are defined in [IETF RFC 1918] and include:
+    ///
+    ///  - `10.0.0.0/8`
+    ///  - `172.16.0.0/12`
+    ///  - `192.168.0.0/16`
+    ///
+    /// [IETF RFC 1918]: https://tools.ietf.org/html/rfc1918
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(10, 0, 0, 1).is_private(), true);
+    /// assert_eq!(Ipv4Addr::new(10, 10, 10, 10).is_private(), true);
+    /// assert_eq!(Ipv4Addr::new(172, 16, 10, 10).is_private(), true);
+    /// assert_eq!(Ipv4Addr::new(172, 29, 45, 14).is_private(), true);
+    /// assert_eq!(Ipv4Addr::new(172, 32, 0, 2).is_private(), false);
+    /// assert_eq!(Ipv4Addr::new(192, 168, 0, 2).is_private(), true);
+    /// assert_eq!(Ipv4Addr::new(192, 169, 0, 2).is_private(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_private(&self) -> bool {
+        match self.octets() {
+            [10, ..] => true,
+            [172, b, ..] if b >= 16 && b <= 31 => true,
+            [192, 168, ..] => true,
+            _ => false,
+        }
+    }
+
+    /// Returns [`true`] if the address is link-local (`169.254.0.0/16`).
+    ///
+    /// This property is defined by [IETF RFC 3927].
+    ///
+    /// [IETF RFC 3927]: https://tools.ietf.org/html/rfc3927
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(169, 254, 0, 0).is_link_local(), true);
+    /// assert_eq!(Ipv4Addr::new(169, 254, 10, 65).is_link_local(), true);
+    /// assert_eq!(Ipv4Addr::new(16, 89, 10, 65).is_link_local(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_link_local(&self) -> bool {
+        matches!(self.octets(), [169, 254, ..])
+    }
+
+    /// Returns [`true`] if the address appears to be globally reachable
+    /// as specified by the [IANA IPv4 Special-Purpose Address Registry].
+    /// Whether or not an address is practically reachable will depend on your network configuration.
+    ///
+    /// Most IPv4 addresses are globally reachable;
+    /// unless they are specifically defined as *not* globally reachable.
+    ///
+    /// Non-exhaustive list of notable addresses that are not globally reachable:
+    ///
+    /// - The [unspecified address] ([`is_unspecified`](Ipv4Addr::is_unspecified))
+    /// - Addresses reserved for private use ([`is_private`](Ipv4Addr::is_private))
+    /// - Addresses in the shared address space ([`is_shared`](Ipv4Addr::is_shared))
+    /// - Loopback addresses ([`is_loopback`](Ipv4Addr::is_loopback))
+    /// - Link-local addresses ([`is_link_local`](Ipv4Addr::is_link_local))
+    /// - Addresses reserved for documentation ([`is_documentation`](Ipv4Addr::is_documentation))
+    /// - Addresses reserved for benchmarking ([`is_benchmarking`](Ipv4Addr::is_benchmarking))
+    /// - Reserved addresses ([`is_reserved`](Ipv4Addr::is_reserved))
+    /// - The [broadcast address] ([`is_broadcast`](Ipv4Addr::is_broadcast))
+    ///
+    /// For the complete overview of which addresses are globally reachable, see the table at the [IANA IPv4 Special-Purpose Address Registry].
+    ///
+    /// [IANA IPv4 Special-Purpose Address Registry]: https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml
+    /// [unspecified address]: Ipv4Addr::UNSPECIFIED
+    /// [broadcast address]: Ipv4Addr::BROADCAST
+
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv4Addr;
+    ///
+    /// // Most IPv4 addresses are globally reachable:
+    /// assert_eq!(Ipv4Addr::new(80, 9, 12, 3).is_global(), true);
+    ///
+    /// // However some addresses have been assigned a special meaning
+    /// // that makes them not globally reachable. Some examples are:
+    ///
+    /// // The unspecified address (`0.0.0.0`)
+    /// assert_eq!(Ipv4Addr::UNSPECIFIED.is_global(), false);
+    ///
+    /// // Addresses reserved for private use (`10.0.0.0/8`, `172.16.0.0/12`, 192.168.0.0/16)
+    /// assert_eq!(Ipv4Addr::new(10, 254, 0, 0).is_global(), false);
+    /// assert_eq!(Ipv4Addr::new(192, 168, 10, 65).is_global(), false);
+    /// assert_eq!(Ipv4Addr::new(172, 16, 10, 65).is_global(), false);
+    ///
+    /// // Addresses in the shared address space (`100.64.0.0/10`)
+    /// assert_eq!(Ipv4Addr::new(100, 100, 0, 0).is_global(), false);
+    ///
+    /// // The loopback addresses (`127.0.0.0/8`)
+    /// assert_eq!(Ipv4Addr::LOCALHOST.is_global(), false);
+    ///
+    /// // Link-local addresses (`169.254.0.0/16`)
+    /// assert_eq!(Ipv4Addr::new(169, 254, 45, 1).is_global(), false);
+    ///
+    /// // Addresses reserved for documentation (`192.0.2.0/24`, `198.51.100.0/24`, `203.0.113.0/24`)
+    /// assert_eq!(Ipv4Addr::new(192, 0, 2, 255).is_global(), false);
+    /// assert_eq!(Ipv4Addr::new(198, 51, 100, 65).is_global(), false);
+    /// assert_eq!(Ipv4Addr::new(203, 0, 113, 6).is_global(), false);
+    ///
+    /// // Addresses reserved for benchmarking (`198.18.0.0/15`)
+    /// assert_eq!(Ipv4Addr::new(198, 18, 0, 0).is_global(), false);
+    ///
+    /// // Reserved addresses (`240.0.0.0/4`)
+    /// assert_eq!(Ipv4Addr::new(250, 10, 20, 30).is_global(), false);
+    ///
+    /// // The broadcast address (`255.255.255.255`)
+    /// assert_eq!(Ipv4Addr::BROADCAST.is_global(), false);
+    ///
+    /// // For a complete overview see the IANA IPv4 Special-Purpose Address Registry.
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv4", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_global(&self) -> bool {
+        !(self.octets()[0] == 0 // "This network"
+            || self.is_private()
+            || self.is_shared()
+            || self.is_loopback()
+            || self.is_link_local()
+            // addresses reserved for future protocols (`192.0.0.0/24`)
+            ||(self.octets()[0] == 192 && self.octets()[1] == 0 && self.octets()[2] == 0)
+            || self.is_documentation()
+            || self.is_benchmarking()
+            || self.is_reserved()
+            || self.is_broadcast())
+    }
+
+    /// Returns [`true`] if this address is part of the Shared Address Space defined in
+    /// [IETF RFC 6598] (`100.64.0.0/10`).
+    ///
+    /// [IETF RFC 6598]: https://tools.ietf.org/html/rfc6598
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(100, 64, 0, 0).is_shared(), true);
+    /// assert_eq!(Ipv4Addr::new(100, 127, 255, 255).is_shared(), true);
+    /// assert_eq!(Ipv4Addr::new(100, 128, 0, 0).is_shared(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv4", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_shared(&self) -> bool {
+        self.octets()[0] == 100 && (self.octets()[1] & 0b1100_0000 == 0b0100_0000)
+    }
+
+    /// Returns [`true`] if this address part of the `198.18.0.0/15` range, which is reserved for
+    /// network devices benchmarking. This range is defined in [IETF RFC 2544] as `192.18.0.0`
+    /// through `198.19.255.255` but [errata 423] corrects it to `198.18.0.0/15`.
+    ///
+    /// [IETF RFC 2544]: https://tools.ietf.org/html/rfc2544
+    /// [errata 423]: https://www.rfc-editor.org/errata/eid423
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(198, 17, 255, 255).is_benchmarking(), false);
+    /// assert_eq!(Ipv4Addr::new(198, 18, 0, 0).is_benchmarking(), true);
+    /// assert_eq!(Ipv4Addr::new(198, 19, 255, 255).is_benchmarking(), true);
+    /// assert_eq!(Ipv4Addr::new(198, 20, 0, 0).is_benchmarking(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv4", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_benchmarking(&self) -> bool {
+        self.octets()[0] == 198 && (self.octets()[1] & 0xfe) == 18
+    }
+
+    /// Returns [`true`] if this address is reserved by IANA for future use. [IETF RFC 1112]
+    /// defines the block of reserved addresses as `240.0.0.0/4`. This range normally includes the
+    /// broadcast address `255.255.255.255`, but this implementation explicitly excludes it, since
+    /// it is obviously not reserved for future use.
+    ///
+    /// [IETF RFC 1112]: https://tools.ietf.org/html/rfc1112
+    ///
+    /// # Warning
+    ///
+    /// As IANA assigns new addresses, this method will be
+    /// updated. This may result in non-reserved addresses being
+    /// treated as reserved in code that relies on an outdated version
+    /// of this method.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(240, 0, 0, 0).is_reserved(), true);
+    /// assert_eq!(Ipv4Addr::new(255, 255, 255, 254).is_reserved(), true);
+    ///
+    /// assert_eq!(Ipv4Addr::new(239, 255, 255, 255).is_reserved(), false);
+    /// // The broadcast address is not considered as reserved for future use by this implementation
+    /// assert_eq!(Ipv4Addr::new(255, 255, 255, 255).is_reserved(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv4", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_reserved(&self) -> bool {
+        self.octets()[0] & 240 == 240 && !self.is_broadcast()
+    }
+
+    /// Returns [`true`] if this is a multicast address (`224.0.0.0/4`).
+    ///
+    /// Multicast addresses have a most significant octet between `224` and `239`,
+    /// and is defined by [IETF RFC 5771].
+    ///
+    /// [IETF RFC 5771]: https://tools.ietf.org/html/rfc5771
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(224, 254, 0, 0).is_multicast(), true);
+    /// assert_eq!(Ipv4Addr::new(236, 168, 10, 65).is_multicast(), true);
+    /// assert_eq!(Ipv4Addr::new(172, 16, 10, 65).is_multicast(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_multicast(&self) -> bool {
+        self.octets()[0] >= 224 && self.octets()[0] <= 239
+    }
+
+    /// Returns [`true`] if this is a broadcast address (`255.255.255.255`).
+    ///
+    /// A broadcast address has all octets set to `255` as defined in [IETF RFC 919].
+    ///
+    /// [IETF RFC 919]: https://tools.ietf.org/html/rfc919
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(255, 255, 255, 255).is_broadcast(), true);
+    /// assert_eq!(Ipv4Addr::new(236, 168, 10, 65).is_broadcast(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_broadcast(&self) -> bool {
+        u32::from_be_bytes(self.octets()) == u32::from_be_bytes(Self::BROADCAST.octets())
+    }
+
+    /// Returns [`true`] if this address is in a range designated for documentation.
+    ///
+    /// This is defined in [IETF RFC 5737]:
+    ///
+    /// - `192.0.2.0/24` (TEST-NET-1)
+    /// - `198.51.100.0/24` (TEST-NET-2)
+    /// - `203.0.113.0/24` (TEST-NET-3)
+    ///
+    /// [IETF RFC 5737]: https://tools.ietf.org/html/rfc5737
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// assert_eq!(Ipv4Addr::new(192, 0, 2, 255).is_documentation(), true);
+    /// assert_eq!(Ipv4Addr::new(198, 51, 100, 65).is_documentation(), true);
+    /// assert_eq!(Ipv4Addr::new(203, 0, 113, 6).is_documentation(), true);
+    /// assert_eq!(Ipv4Addr::new(193, 34, 17, 19).is_documentation(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_documentation(&self) -> bool {
+        matches!(
+            self.octets(),
+            [192, 0, 2, _] | [198, 51, 100, _] | [203, 0, 113, _]
+        )
+    }
+
+    /// Converts this address to an [IPv4-compatible] [`IPv6` address].
+    ///
+    /// `a.b.c.d` becomes `::a.b.c.d`
+    ///
+    /// Note that IPv4-compatible addresses have been officially deprecated.
+    /// If you don't explicitly need an IPv4-compatible address for legacy reasons, consider using `to_ipv6_mapped` instead.
+    ///
+    /// [IPv4-compatible]: Ipv6Addr#ipv4-compatible-ipv6-addresses
+    /// [`IPv6` address]: Ipv6Addr
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(
+    ///     Ipv4Addr::new(192, 0, 2, 255).to_ipv6_compatible(),
+    ///     Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0xc000, 0x2ff)
+    /// );
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use = "this returns the result of the operation, \
+                  without modifying the original"]
+    #[inline]
+    pub const fn to_ipv6_compatible(&self) -> Ipv6Addr {
+        let [a, b, c, d] = self.octets();
+        Ipv6Addr {
+            octets: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, a, b, c, d],
+        }
+    }
+
+    /// Converts this address to an [IPv4-mapped] [`IPv6` address].
+    ///
+    /// `a.b.c.d` becomes `::ffff:a.b.c.d`
+    ///
+    /// [IPv4-mapped]: Ipv6Addr#ipv4-mapped-ipv6-addresses
+    /// [`IPv6` address]: Ipv6Addr
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(Ipv4Addr::new(192, 0, 2, 255).to_ipv6_mapped(),
+    ///            Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc000, 0x2ff));
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use = "this returns the result of the operation, \
+                  without modifying the original"]
+    #[inline]
+    pub const fn to_ipv6_mapped(&self) -> Ipv6Addr {
+        let [a, b, c, d] = self.octets();
+        Ipv6Addr {
+            octets: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, a, b, c, d],
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_from_ip", since = "1.16.0"))]
+impl From<Ipv4Addr> for IpAddr {
+    /// Copies this address to a new `IpAddr::V4`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr};
+    ///
+    /// let addr = Ipv4Addr::new(127, 0, 0, 1);
+    ///
+    /// assert_eq!(
+    ///     IpAddr::V4(addr),
+    ///     IpAddr::from(addr)
+    /// )
+    /// ```
+    #[inline]
+    fn from(ipv4: Ipv4Addr) -> IpAddr {
+        IpAddr::V4(ipv4)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_from_ip", since = "1.16.0"))]
+impl From<Ipv6Addr> for IpAddr {
+    /// Copies this address to a new `IpAddr::V6`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv6Addr};
+    ///
+    /// let addr = Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff);
+    ///
+    /// assert_eq!(
+    ///     IpAddr::V6(addr),
+    ///     IpAddr::from(addr)
+    /// );
+    /// ```
+    #[inline]
+    fn from(ipv6: Ipv6Addr) -> IpAddr {
+        IpAddr::V6(ipv6)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialEq<Ipv4Addr> for IpAddr {
+    #[inline]
+    fn eq(&self, other: &Ipv4Addr) -> bool {
+        match self {
+            IpAddr::V4(v4) => v4 == other,
+            IpAddr::V6(_) => false,
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialEq<IpAddr> for Ipv4Addr {
+    #[inline]
+    fn eq(&self, other: &IpAddr) -> bool {
+        match other {
+            IpAddr::V4(v4) => self == v4,
+            IpAddr::V6(_) => false,
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+impl PartialOrd for Ipv4Addr {
+    #[inline]
+    fn partial_cmp(&self, other: &Ipv4Addr) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialOrd<Ipv4Addr> for IpAddr {
+    #[inline]
+    fn partial_cmp(&self, other: &Ipv4Addr) -> Option<Ordering> {
+        match self {
+            IpAddr::V4(v4) => v4.partial_cmp(other),
+            IpAddr::V6(_) => Some(Ordering::Greater),
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialOrd<IpAddr> for Ipv4Addr {
+    #[inline]
+    fn partial_cmp(&self, other: &IpAddr) -> Option<Ordering> {
+        match other {
+            IpAddr::V4(v4) => self.partial_cmp(v4),
+            IpAddr::V6(_) => Some(Ordering::Less),
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+impl Ord for Ipv4Addr {
+    #[inline]
+    fn cmp(&self, other: &Ipv4Addr) -> Ordering {
+        self.octets.cmp(&other.octets)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_u32", since = "1.1.0"))]
+impl From<Ipv4Addr> for u32 {
+    /// Converts an `Ipv4Addr` into a host byte order `u32`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::new(0x12, 0x34, 0x56, 0x78);
+    /// assert_eq!(0x12345678, u32::from(addr));
+    /// ```
+    #[inline]
+    fn from(ip: Ipv4Addr) -> u32 {
+        u32::from_be_bytes(ip.octets)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_u32", since = "1.1.0"))]
+impl From<u32> for Ipv4Addr {
+    /// Converts a host byte order `u32` into an `Ipv4Addr`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::from(0x12345678);
+    /// assert_eq!(Ipv4Addr::new(0x12, 0x34, 0x56, 0x78), addr);
+    /// ```
+    #[inline]
+    fn from(ip: u32) -> Ipv4Addr {
+        Ipv4Addr {
+            octets: ip.to_be_bytes(),
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "from_slice_v4", since = "1.9.0"))]
+impl From<[u8; 4]> for Ipv4Addr {
+    /// Creates an `Ipv4Addr` from a four element byte array.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::from([13u8, 12u8, 11u8, 10u8]);
+    /// assert_eq!(Ipv4Addr::new(13, 12, 11, 10), addr);
+    /// ```
+    #[inline]
+    fn from(octets: [u8; 4]) -> Ipv4Addr {
+        Ipv4Addr { octets }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_from_slice", since = "1.17.0"))]
+impl From<[u8; 4]> for IpAddr {
+    /// Creates an `IpAddr::V4` from a four element byte array.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr};
+    ///
+    /// let addr = IpAddr::from([13u8, 12u8, 11u8, 10u8]);
+    /// assert_eq!(IpAddr::V4(Ipv4Addr::new(13, 12, 11, 10)), addr);
+    /// ```
+    #[inline]
+    fn from(octets: [u8; 4]) -> IpAddr {
+        IpAddr::V4(Ipv4Addr::from(octets))
+    }
+}
+
+impl Ipv6Addr {
+    /// Creates a new IPv6 address from eight 16-bit segments.
+    ///
+    /// The result will represent the IP address `a:b:c:d:e:f:g:h`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_32", since = "1.32.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[allow(clippy::too_many_arguments)]
+    #[must_use]
+    #[inline]
+    pub const fn new(a: u16, b: u16, c: u16, d: u16, e: u16, f: u16, g: u16, h: u16) -> Ipv6Addr {
+        let addr16 = [
+            a.to_be(),
+            b.to_be(),
+            c.to_be(),
+            d.to_be(),
+            e.to_be(),
+            f.to_be(),
+            g.to_be(),
+            h.to_be(),
+        ];
+        Ipv6Addr {
+            // All elements in `addr16` are big endian.
+            // SAFETY: `[u16; 8]` is always safe to transmute to `[u8; 16]`.
+            octets: unsafe { transmute::<_, [u8; 16]>(addr16) },
+        }
+    }
+
+    /// An IPv6 address representing localhost: `::1`.
+    ///
+    /// This corresponds to constant `IN6ADDR_LOOPBACK_INIT` or `in6addr_loopback` in other
+    /// languages.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::LOCALHOST;
+    /// assert_eq!(addr, Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
+    /// ```
+    #[doc(alias = "IN6ADDR_LOOPBACK_INIT")]
+    #[doc(alias = "in6addr_loopback")]
+    #[cfg_attr(staged_api, stable(feature = "ip_constructors", since = "1.30.0"))]
+    pub const LOCALHOST: Self = Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1);
+
+    /// An IPv6 address representing the unspecified address: `::`
+    ///
+    /// This corresponds to constant `IN6ADDR_ANY_INIT` or `in6addr_any` in other languages.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::UNSPECIFIED;
+    /// assert_eq!(addr, Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0));
+    /// ```
+    #[doc(alias = "IN6ADDR_ANY_INIT")]
+    #[doc(alias = "in6addr_any")]
+    #[cfg_attr(staged_api, stable(feature = "ip_constructors", since = "1.30.0"))]
+    pub const UNSPECIFIED: Self = Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0);
+
+    /// Returns the eight 16-bit segments that make up this address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).segments(),
+    ///            [0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff]);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn segments(&self) -> [u16; 8] {
+        // All elements in `self.octets` must be big endian.
+        // SAFETY: `[u8; 16]` is always safe to transmute to `[u16; 8]`.
+        let [a, b, c, d, e, f, g, h] = unsafe { transmute::<_, [u16; 8]>(self.octets) };
+        // We want native endian u16
+        [
+            u16::from_be(a),
+            u16::from_be(b),
+            u16::from_be(c),
+            u16::from_be(d),
+            u16::from_be(e),
+            u16::from_be(f),
+            u16::from_be(g),
+            u16::from_be(h),
+        ]
+    }
+
+    /// Returns [`true`] for the special 'unspecified' address (`::`).
+    ///
+    /// This property is defined in [IETF RFC 4291].
+    ///
+    /// [IETF RFC 4291]: https://tools.ietf.org/html/rfc4291
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_unspecified(), false);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0).is_unspecified(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_unspecified(&self) -> bool {
+        u128::from_be_bytes(self.octets()) == u128::from_be_bytes(Ipv6Addr::UNSPECIFIED.octets())
+    }
+
+    /// Returns [`true`] if this is the [loopback address] (`::1`),
+    /// as defined in [IETF RFC 4291 section 2.5.3].
+    ///
+    /// Contrary to IPv4, in IPv6 there is only one loopback address.
+    ///
+    /// [loopback address]: Ipv6Addr::LOCALHOST
+    /// [IETF RFC 4291 section 2.5.3]: https://tools.ietf.org/html/rfc4291#section-2.5.3
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_loopback(), false);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0x1).is_loopback(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_loopback(&self) -> bool {
+        u128::from_be_bytes(self.octets()) == u128::from_be_bytes(Ipv6Addr::LOCALHOST.octets())
+    }
+
+    /// Returns [`true`] if the address appears to be globally reachable
+    /// as specified by the [IANA IPv6 Special-Purpose Address Registry].
+    /// Whether or not an address is practically reachable will depend on your network configuration.
+    ///
+    /// Most IPv6 addresses are globally reachable;
+    /// unless they are specifically defined as *not* globally reachable.
+    ///
+    /// Non-exhaustive list of notable addresses that are not globally reachable:
+    /// - The [unspecified address] ([`is_unspecified`](Ipv6Addr::is_unspecified))
+    /// - The [loopback address] ([`is_loopback`](Ipv6Addr::is_loopback))
+    /// - IPv4-mapped addresses
+    /// - Addresses reserved for benchmarking
+    /// - Addresses reserved for documentation ([`is_documentation`](Ipv6Addr::is_documentation))
+    /// - Unique local addresses ([`is_unique_local`](Ipv6Addr::is_unique_local))
+    /// - Unicast addresses with link-local scope ([`is_unicast_link_local`](Ipv6Addr::is_unicast_link_local))
+    ///
+    /// For the complete overview of which addresses are globally reachable, see the table at the [IANA IPv6 Special-Purpose Address Registry].
+    ///
+    /// Note that an address having global scope is not the same as being globally reachable,
+    /// and there is no direct relation between the two concepts: There exist addresses with global scope
+    /// that are not globally reachable (for example unique local addresses),
+    /// and addresses that are globally reachable without having global scope
+    /// (multicast addresses with non-global scope).
+    ///
+    /// [IANA IPv6 Special-Purpose Address Registry]: https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml
+    /// [unspecified address]: Ipv6Addr::UNSPECIFIED
+    /// [loopback address]: Ipv6Addr::LOCALHOST
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// // Most IPv6 addresses are globally reachable:
+    /// assert_eq!(Ipv6Addr::new(0x26, 0, 0x1c9, 0, 0, 0xafc8, 0x10, 0x1).is_global(), true);
+    ///
+    /// // However some addresses have been assigned a special meaning
+    /// // that makes them not globally reachable. Some examples are:
+    ///
+    /// // The unspecified address (`::`)
+    /// assert_eq!(Ipv6Addr::UNSPECIFIED.is_global(), false);
+    ///
+    /// // The loopback address (`::1`)
+    /// assert_eq!(Ipv6Addr::LOCALHOST.is_global(), false);
+    ///
+    /// // IPv4-mapped addresses (`::ffff:0:0/96`)
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_global(), false);
+    ///
+    /// // Addresses reserved for benchmarking (`2001:2::/48`)
+    /// assert_eq!(Ipv6Addr::new(0x2001, 2, 0, 0, 0, 0, 0, 1,).is_global(), false);
+    ///
+    /// // Addresses reserved for documentation (`2001:db8::/32`)
+    /// assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1).is_global(), false);
+    ///
+    /// // Unique local addresses (`fc00::/7`)
+    /// assert_eq!(Ipv6Addr::new(0xfc02, 0, 0, 0, 0, 0, 0, 1).is_global(), false);
+    ///
+    /// // Unicast addresses with link-local scope (`fe80::/10`)
+    /// assert_eq!(Ipv6Addr::new(0xfe81, 0, 0, 0, 0, 0, 0, 1).is_global(), false);
+    ///
+    /// // For a complete overview see the IANA IPv6 Special-Purpose Address Registry.
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_global(&self) -> bool {
+        !(self.is_unspecified()
+            || self.is_loopback()
+            // IPv4-mapped Address (`::ffff:0:0/96`)
+            || matches!(self.segments(), [0, 0, 0, 0, 0, 0xffff, _, _])
+            // IPv4-IPv6 Translat. (`64:ff9b:1::/48`)
+            || matches!(self.segments(), [0x64, 0xff9b, 1, _, _, _, _, _])
+            // Discard-Only Address Block (`100::/64`)
+            || matches!(self.segments(), [0x100, 0, 0, 0, _, _, _, _])
+            // IETF Protocol Assignments (`2001::/23`)
+            || (matches!(self.segments(), [0x2001, b, _, _, _, _, _, _] if b < 0x200)
+                && !(
+                    // Port Control Protocol Anycast (`2001:1::1`)
+                    u128::from_be_bytes(self.octets()) == 0x2001_0001_0000_0000_0000_0000_0000_0001
+                    // Traversal Using Relays around NAT Anycast (`2001:1::2`)
+                    || u128::from_be_bytes(self.octets()) == 0x2001_0001_0000_0000_0000_0000_0000_0002
+                    // AMT (`2001:3::/32`)
+                    || matches!(self.segments(), [0x2001, 3, _, _, _, _, _, _])
+                    // AS112-v6 (`2001:4:112::/48`)
+                    || matches!(self.segments(), [0x2001, 4, 0x112, _, _, _, _, _])
+                    // ORCHIDv2 (`2001:20::/28`)
+                    || matches!(self.segments(), [0x2001, b, _, _, _, _, _, _] if b >= 0x20 && b <= 0x2F)
+                ))
+            || self.is_documentation()
+            || self.is_unique_local()
+            || self.is_unicast_link_local())
+    }
+
+    /// Returns [`true`] if this is a unique local address (`fc00::/7`).
+    ///
+    /// This property is defined in [IETF RFC 4193].
+    ///
+    /// [IETF RFC 4193]: https://tools.ietf.org/html/rfc4193
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_unique_local(), false);
+    /// assert_eq!(Ipv6Addr::new(0xfc02, 0, 0, 0, 0, 0, 0, 0).is_unique_local(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_unique_local(&self) -> bool {
+        (self.segments()[0] & 0xfe00) == 0xfc00
+    }
+
+    /// Returns [`true`] if this is a unicast address, as defined by [IETF RFC 4291].
+    /// Any address that is not a [multicast address] (`ff00::/8`) is unicast.
+    ///
+    /// [IETF RFC 4291]: https://tools.ietf.org/html/rfc4291
+    /// [multicast address]: Ipv6Addr::is_multicast
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// // The unspecified and loopback addresses are unicast.
+    /// assert_eq!(Ipv6Addr::UNSPECIFIED.is_unicast(), true);
+    /// assert_eq!(Ipv6Addr::LOCALHOST.is_unicast(), true);
+    ///
+    /// // Any address that is not a multicast address (`ff00::/8`) is unicast.
+    /// assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0).is_unicast(), true);
+    /// assert_eq!(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0).is_unicast(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_unicast(&self) -> bool {
+        !self.is_multicast()
+    }
+
+    /// Returns `true` if the address is a unicast address with link-local scope,
+    /// as defined in [RFC 4291].
+    ///
+    /// A unicast address has link-local scope if it has the prefix `fe80::/10`, as per [RFC 4291 section 2.4].
+    /// Note that this encompasses more addresses than those defined in [RFC 4291 section 2.5.6],
+    /// which describes "Link-Local IPv6 Unicast Addresses" as having the following stricter format:
+    ///
+    /// ```text
+    /// | 10 bits  |         54 bits         |          64 bits           |
+    /// +----------+-------------------------+----------------------------+
+    /// |1111111010|           0             |       interface ID         |
+    /// +----------+-------------------------+----------------------------+
+    /// ```
+    /// So while currently the only addresses with link-local scope an application will encounter are all in `fe80::/64`,
+    /// this might change in the future with the publication of new standards. More addresses in `fe80::/10` could be allocated,
+    /// and those addresses will have link-local scope.
+    ///
+    /// Also note that while [RFC 4291 section 2.5.3] mentions about the [loopback address] (`::1`) that "it is treated as having Link-Local scope",
+    /// this does not mean that the loopback address actually has link-local scope and this method will return `false` on it.
+    ///
+    /// [RFC 4291]: https://tools.ietf.org/html/rfc4291
+    /// [RFC 4291 section 2.4]: https://tools.ietf.org/html/rfc4291#section-2.4
+    /// [RFC 4291 section 2.5.3]: https://tools.ietf.org/html/rfc4291#section-2.5.3
+    /// [RFC 4291 section 2.5.6]: https://tools.ietf.org/html/rfc4291#section-2.5.6
+    /// [loopback address]: Ipv6Addr::LOCALHOST
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// // The loopback address (`::1`) does not actually have link-local scope.
+    /// assert_eq!(Ipv6Addr::LOCALHOST.is_unicast_link_local(), false);
+    ///
+    /// // Only addresses in `fe80::/10` have link-local scope.
+    /// assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0).is_unicast_link_local(), false);
+    /// assert_eq!(Ipv6Addr::new(0xfe80, 0, 0, 0, 0, 0, 0, 0).is_unicast_link_local(), true);
+    ///
+    /// // Addresses outside the stricter `fe80::/64` also have link-local scope.
+    /// assert_eq!(Ipv6Addr::new(0xfe80, 0, 0, 1, 0, 0, 0, 0).is_unicast_link_local(), true);
+    /// assert_eq!(Ipv6Addr::new(0xfe81, 0, 0, 0, 0, 0, 0, 0).is_unicast_link_local(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_unicast_link_local(&self) -> bool {
+        (self.segments()[0] & 0xffc0) == 0xfe80
+    }
+
+    /// Returns [`true`] if this is an address reserved for documentation
+    /// (`2001:db8::/32`).
+    ///
+    /// This property is defined in [IETF RFC 3849].
+    ///
+    /// [IETF RFC 3849]: https://tools.ietf.org/html/rfc3849
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_documentation(), false);
+    /// assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0).is_documentation(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_documentation(&self) -> bool {
+        (self.segments()[0] == 0x2001) && (self.segments()[1] == 0xdb8)
+    }
+
+    /// Returns [`true`] if this is an address reserved for benchmarking (`2001:2::/48`).
+    ///
+    /// This property is defined in [IETF RFC 5180], where it is mistakenly specified as covering the range `2001:0200::/48`.
+    /// This is corrected in [IETF RFC Errata 1752] to `2001:0002::/48`.
+    ///
+    /// [IETF RFC 5180]: https://tools.ietf.org/html/rfc5180
+    /// [IETF RFC Errata 1752]: https://www.rfc-editor.org/errata_search.php?eid=1752
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc613, 0x0).is_benchmarking(), false);
+    /// assert_eq!(Ipv6Addr::new(0x2001, 0x2, 0, 0, 0, 0, 0, 0).is_benchmarking(), true);
+    /// ```
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_benchmarking(&self) -> bool {
+        (self.segments()[0] == 0x2001) && (self.segments()[1] == 0x2) && (self.segments()[2] == 0)
+    }
+
+    /// Returns [`true`] if the address is a globally routable unicast address.
+    ///
+    /// The following return false:
+    ///
+    /// - the loopback address
+    /// - the link-local addresses
+    /// - unique local addresses
+    /// - the unspecified address
+    /// - the address range reserved for documentation
+    ///
+    /// This method returns [`true`] for site-local addresses as per [RFC 4291 section 2.5.7]
+    ///
+    /// ```no_rust
+    /// The special behavior of [the site-local unicast] prefix defined in [RFC3513] must no longer
+    /// be supported in new implementations (i.e., new implementations must treat this prefix as
+    /// Global Unicast).
+    /// ```
+    ///
+    /// [RFC 4291 section 2.5.7]: https://tools.ietf.org/html/rfc4291#section-2.5.7
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0).is_unicast_global(), false);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_unicast_global(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_unicast_global(&self) -> bool {
+        self.is_unicast()
+            && !self.is_loopback()
+            && !self.is_unicast_link_local()
+            && !self.is_unique_local()
+            && !self.is_unspecified()
+            && !self.is_documentation()
+            && !self.is_benchmarking()
+    }
+
+    /// Returns the address' multicast scope if the address is multicast.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    ///
+    /// use std::net::{Ipv6Addr, Ipv6MulticastScope};
+    ///
+    /// assert_eq!(
+    ///     Ipv6Addr::new(0xff0e, 0, 0, 0, 0, 0, 0, 0).multicast_scope(),
+    ///     Some(Ipv6MulticastScope::Global)
+    /// );
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).multicast_scope(), None);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use]
+    #[inline]
+    pub const fn multicast_scope(&self) -> Option<Ipv6MulticastScope> {
+        if self.is_multicast() {
+            match self.segments()[0] & 0x000f {
+                1 => Some(Ipv6MulticastScope::InterfaceLocal),
+                2 => Some(Ipv6MulticastScope::LinkLocal),
+                3 => Some(Ipv6MulticastScope::RealmLocal),
+                4 => Some(Ipv6MulticastScope::AdminLocal),
+                5 => Some(Ipv6MulticastScope::SiteLocal),
+                8 => Some(Ipv6MulticastScope::OrganizationLocal),
+                14 => Some(Ipv6MulticastScope::Global),
+                _ => None,
+            }
+        } else {
+            None
+        }
+    }
+
+    /// Returns [`true`] if this is a multicast address (`ff00::/8`).
+    ///
+    /// This property is defined by [IETF RFC 4291].
+    ///
+    /// [IETF RFC 4291]: https://tools.ietf.org/html/rfc4291
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0).is_multicast(), true);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_multicast(), false);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(since = "1.7.0", feature = "ip_17"))]
+    #[must_use]
+    #[inline]
+    pub const fn is_multicast(&self) -> bool {
+        (self.segments()[0] & 0xff00) == 0xff00
+    }
+
+    /// Converts this address to an [`IPv4` address] if it's an [IPv4-mapped] address,
+    /// as defined in [IETF RFC 4291 section 2.5.5.2], otherwise returns [`None`].
+    ///
+    /// `::ffff:a.b.c.d` becomes `a.b.c.d`.
+    /// All addresses *not* starting with `::ffff` will return `None`.
+    ///
+    /// [`IPv4` address]: Ipv4Addr
+    /// [IPv4-mapped]: Ipv6Addr
+    /// [IETF RFC 4291 section 2.5.5.2]: https://tools.ietf.org/html/rfc4291#section-2.5.5.2
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0).to_ipv4_mapped(), None);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).to_ipv4_mapped(),
+    ///            Some(Ipv4Addr::new(192, 10, 2, 255)));
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1).to_ipv4_mapped(), None);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ipv6_to_ipv4_mapped", since = "1.63.0"))]
+    #[must_use = "this returns the result of the operation, \
+                  without modifying the original"]
+    #[inline]
+    pub const fn to_ipv4_mapped(&self) -> Option<Ipv4Addr> {
+        match self.octets() {
+            [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, a, b, c, d] => {
+                Some(Ipv4Addr::new(a, b, c, d))
+            }
+            _ => None,
+        }
+    }
+
+    /// Converts this address to an [`IPv4` address] if it is either
+    /// an [IPv4-compatible] address as defined in [IETF RFC 4291 section 2.5.5.1],
+    /// or an [IPv4-mapped] address as defined in [IETF RFC 4291 section 2.5.5.2],
+    /// otherwise returns [`None`].
+    ///
+    /// Note that this will return an [`IPv4` address] for the IPv6 loopback address `::1`. Use
+    /// [`Ipv6Addr::to_ipv4_mapped`] to avoid this.
+    ///
+    /// `::a.b.c.d` and `::ffff:a.b.c.d` become `a.b.c.d`. `::1` becomes `0.0.0.1`.
+    /// All addresses *not* starting with either all zeroes or `::ffff` will return `None`.
+    ///
+    /// [`IPv4` address]: Ipv4Addr
+    /// [IPv4-compatible]: Ipv6Addr#ipv4-compatible-ipv6-addresses
+    /// [IPv4-mapped]: Ipv6Addr#ipv4-mapped-ipv6-addresses
+    /// [IETF RFC 4291 section 2.5.5.1]: https://tools.ietf.org/html/rfc4291#section-2.5.5.1
+    /// [IETF RFC 4291 section 2.5.5.2]: https://tools.ietf.org/html/rfc4291#section-2.5.5.2
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{Ipv4Addr, Ipv6Addr};
+    ///
+    /// assert_eq!(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0).to_ipv4(), None);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).to_ipv4(),
+    ///            Some(Ipv4Addr::new(192, 10, 2, 255)));
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1).to_ipv4(),
+    ///            Some(Ipv4Addr::new(0, 0, 0, 1)));
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_50", since = "1.50.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use = "this returns the result of the operation, \
+                  without modifying the original"]
+    #[inline]
+    pub const fn to_ipv4(&self) -> Option<Ipv4Addr> {
+        if let [0, 0, 0, 0, 0, 0 | 0xffff, ab, cd] = self.segments() {
+            let [a, b] = ab.to_be_bytes();
+            let [c, d] = cd.to_be_bytes();
+            Some(Ipv4Addr::new(a, b, c, d))
+        } else {
+            None
+        }
+    }
+
+    /// Converts this address to an `IpAddr::V4` if it is an IPv4-mapped addresses, otherwise it
+    /// returns self wrapped in an `IpAddr::V6`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(ip)]
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x7f00, 0x1).is_loopback(), false);
+    /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x7f00, 0x1).to_canonical().is_loopback(), true);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_ipv6", issue = "76205")
+    )]
+    #[cfg_attr(staged_api, unstable(feature = "ip", issue = "27709"))]
+    #[must_use = "this returns the result of the operation, \
+                  without modifying the original"]
+    #[inline]
+    pub const fn to_canonical(&self) -> IpAddr {
+        if let Some(mapped) = self.to_ipv4_mapped() {
+            return IpAddr::V4(mapped);
+        }
+        IpAddr::V6(*self)
+    }
+
+    /// Returns the sixteen eight-bit integers the IPv6 address consists of.
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// assert_eq!(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0).octets(),
+    ///            [255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);
+    /// ```
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "const_ip_32", since = "1.32.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "ipv6_to_octets", since = "1.12.0"))]
+    #[must_use]
+    #[inline]
+    pub const fn octets(&self) -> [u8; 16] {
+        self.octets
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialEq<IpAddr> for Ipv6Addr {
+    #[inline]
+    fn eq(&self, other: &IpAddr) -> bool {
+        match other {
+            IpAddr::V4(_) => false,
+            IpAddr::V6(v6) => self == v6,
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialEq<Ipv6Addr> for IpAddr {
+    #[inline]
+    fn eq(&self, other: &Ipv6Addr) -> bool {
+        match self {
+            IpAddr::V4(_) => false,
+            IpAddr::V6(v6) => v6 == other,
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+impl PartialOrd for Ipv6Addr {
+    #[inline]
+    fn partial_cmp(&self, other: &Ipv6Addr) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialOrd<Ipv6Addr> for IpAddr {
+    #[inline]
+    fn partial_cmp(&self, other: &Ipv6Addr) -> Option<Ordering> {
+        match self {
+            IpAddr::V4(_) => Some(Ordering::Less),
+            IpAddr::V6(v6) => v6.partial_cmp(other),
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_cmp", since = "1.16.0"))]
+impl PartialOrd<IpAddr> for Ipv6Addr {
+    #[inline]
+    fn partial_cmp(&self, other: &IpAddr) -> Option<Ordering> {
+        match other {
+            IpAddr::V4(_) => Some(Ordering::Greater),
+            IpAddr::V6(v6) => self.partial_cmp(v6),
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+impl Ord for Ipv6Addr {
+    #[inline]
+    fn cmp(&self, other: &Ipv6Addr) -> Ordering {
+        self.segments().cmp(&other.segments())
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "i128", since = "1.26.0"))]
+impl From<Ipv6Addr> for u128 {
+    /// Convert an `Ipv6Addr` into a host byte order `u128`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::new(
+    ///     0x1020, 0x3040, 0x5060, 0x7080,
+    ///     0x90A0, 0xB0C0, 0xD0E0, 0xF00D,
+    /// );
+    /// assert_eq!(0x102030405060708090A0B0C0D0E0F00D_u128, u128::from(addr));
+    /// ```
+    #[inline]
+    fn from(ip: Ipv6Addr) -> u128 {
+        u128::from_be_bytes(ip.octets)
+    }
+}
+#[cfg_attr(staged_api, stable(feature = "i128", since = "1.26.0"))]
+impl From<u128> for Ipv6Addr {
+    /// Convert a host byte order `u128` into an `Ipv6Addr`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::from(0x102030405060708090A0B0C0D0E0F00D_u128);
+    /// assert_eq!(
+    ///     Ipv6Addr::new(
+    ///         0x1020, 0x3040, 0x5060, 0x7080,
+    ///         0x90A0, 0xB0C0, 0xD0E0, 0xF00D,
+    ///     ),
+    ///     addr);
+    /// ```
+    #[inline]
+    fn from(ip: u128) -> Ipv6Addr {
+        Ipv6Addr::from(ip.to_be_bytes())
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ipv6_from_octets", since = "1.9.0"))]
+impl From<[u8; 16]> for Ipv6Addr {
+    /// Creates an `Ipv6Addr` from a sixteen element byte array.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::from([
+    ///     25u8, 24u8, 23u8, 22u8, 21u8, 20u8, 19u8, 18u8,
+    ///     17u8, 16u8, 15u8, 14u8, 13u8, 12u8, 11u8, 10u8,
+    /// ]);
+    /// assert_eq!(
+    ///     Ipv6Addr::new(
+    ///         0x1918, 0x1716,
+    ///         0x1514, 0x1312,
+    ///         0x1110, 0x0f0e,
+    ///         0x0d0c, 0x0b0a
+    ///     ),
+    ///     addr
+    /// );
+    /// ```
+    #[inline]
+    fn from(octets: [u8; 16]) -> Ipv6Addr {
+        Ipv6Addr { octets }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ipv6_from_segments", since = "1.16.0"))]
+impl From<[u16; 8]> for Ipv6Addr {
+    /// Creates an `Ipv6Addr` from an eight element 16-bit array.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::from([
+    ///     525u16, 524u16, 523u16, 522u16,
+    ///     521u16, 520u16, 519u16, 518u16,
+    /// ]);
+    /// assert_eq!(
+    ///     Ipv6Addr::new(
+    ///         0x20d, 0x20c,
+    ///         0x20b, 0x20a,
+    ///         0x209, 0x208,
+    ///         0x207, 0x206
+    ///     ),
+    ///     addr
+    /// );
+    /// ```
+    #[inline]
+    fn from(segments: [u16; 8]) -> Ipv6Addr {
+        let [a, b, c, d, e, f, g, h] = segments;
+        Ipv6Addr::new(a, b, c, d, e, f, g, h)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_from_slice", since = "1.17.0"))]
+impl From<[u8; 16]> for IpAddr {
+    /// Creates an `IpAddr::V6` from a sixteen element byte array.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv6Addr};
+    ///
+    /// let addr = IpAddr::from([
+    ///     25u8, 24u8, 23u8, 22u8, 21u8, 20u8, 19u8, 18u8,
+    ///     17u8, 16u8, 15u8, 14u8, 13u8, 12u8, 11u8, 10u8,
+    /// ]);
+    /// assert_eq!(
+    ///     IpAddr::V6(Ipv6Addr::new(
+    ///         0x1918, 0x1716,
+    ///         0x1514, 0x1312,
+    ///         0x1110, 0x0f0e,
+    ///         0x0d0c, 0x0b0a
+    ///     )),
+    ///     addr
+    /// );
+    /// ```
+    #[inline]
+    fn from(octets: [u8; 16]) -> IpAddr {
+        IpAddr::V6(Ipv6Addr::from(octets))
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_from_slice", since = "1.17.0"))]
+impl From<[u16; 8]> for IpAddr {
+    /// Creates an `IpAddr::V6` from an eight element 16-bit array.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv6Addr};
+    ///
+    /// let addr = IpAddr::from([
+    ///     525u16, 524u16, 523u16, 522u16,
+    ///     521u16, 520u16, 519u16, 518u16,
+    /// ]);
+    /// assert_eq!(
+    ///     IpAddr::V6(Ipv6Addr::new(
+    ///         0x20d, 0x20c,
+    ///         0x20b, 0x20a,
+    ///         0x209, 0x208,
+    ///         0x207, 0x206
+    ///     )),
+    ///     addr
+    /// );
+    /// ```
+    #[inline]
+    fn from(segments: [u16; 8]) -> IpAddr {
+        IpAddr::V6(Ipv6Addr::from(segments))
+    }
+}
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/net/mod.rs b/vendor/rustix/src/maybe_polyfill/no_std/net/mod.rs
new file mode 100644
index 0000000..06e8f94
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/net/mod.rs
@@ -0,0 +1,6 @@
+mod ip_addr;
+mod socket_addr;
+
+#[allow(unused_imports)]
+pub use self::ip_addr::{IpAddr, Ipv4Addr, Ipv6Addr, Ipv6MulticastScope};
+pub use self::socket_addr::{SocketAddr, SocketAddrV4, SocketAddrV6};
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/net/socket_addr.rs b/vendor/rustix/src/maybe_polyfill/no_std/net/socket_addr.rs
new file mode 100644
index 0000000..053d8f6
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/net/socket_addr.rs
@@ -0,0 +1,641 @@
+//! The following is derived from Rust's
+//! library/std/src/net/socket_addr.rs at revision
+//! bd20fc1fd657b32f7aa1d70d8723f04c87f21606.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+//!
+//! This defines `SocketAddr`, `SocketAddrV4`, and `SocketAddrV6` in a
+//! platform-independent way. It is not the native representation.
+
+use super::ip_addr::{IpAddr, Ipv4Addr, Ipv6Addr};
+use core::cmp::Ordering;
+use core::hash;
+
+/// An internet socket address, either IPv4 or IPv6.
+///
+/// Internet socket addresses consist of an [IP address], a 16-bit port number, as well
+/// as possibly some version-dependent additional information. See [`SocketAddrV4`]'s and
+/// [`SocketAddrV6`]'s respective documentation for more details.
+///
+/// The size of a `SocketAddr` instance may vary depending on the target operating
+/// system.
+///
+/// [IP address]: IpAddr
+///
+/// # Examples
+///
+/// ```
+/// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+///
+/// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
+///
+/// assert_eq!("127.0.0.1:8080".parse(), Ok(socket));
+/// assert_eq!(socket.port(), 8080);
+/// assert_eq!(socket.is_ipv4(), true);
+/// ```
+#[derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub enum SocketAddr {
+    /// An IPv4 socket address.
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    V4(#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))] SocketAddrV4),
+    /// An IPv6 socket address.
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    V6(#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))] SocketAddrV6),
+}
+
+/// An IPv4 socket address.
+///
+/// IPv4 socket addresses consist of an [`IPv4` address] and a 16-bit port number, as
+/// stated in [IETF RFC 793].
+///
+/// See [`SocketAddr`] for a type encompassing both IPv4 and IPv6 socket addresses.
+///
+/// The size of a `SocketAddrV4` struct may vary depending on the target operating
+/// system. Do not assume that this type has the same memory layout as the underlying
+/// system representation.
+///
+/// [IETF RFC 793]: https://tools.ietf.org/html/rfc793
+/// [`IPv4` address]: Ipv4Addr
+///
+/// # Examples
+///
+/// ```
+/// use std::net::{Ipv4Addr, SocketAddrV4};
+///
+/// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
+///
+/// assert_eq!("127.0.0.1:8080".parse(), Ok(socket));
+/// assert_eq!(socket.ip(), &Ipv4Addr::new(127, 0, 0, 1));
+/// assert_eq!(socket.port(), 8080);
+/// ```
+#[derive(Copy, Clone, Eq, PartialEq)]
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub struct SocketAddrV4 {
+    ip: Ipv4Addr,
+    port: u16,
+}
+
+/// An IPv6 socket address.
+///
+/// IPv6 socket addresses consist of an [`IPv6` address], a 16-bit port number, as well
+/// as fields containing the traffic class, the flow label, and a scope identifier
+/// (see [IETF RFC 2553, Section 3.3] for more details).
+///
+/// See [`SocketAddr`] for a type encompassing both IPv4 and IPv6 socket addresses.
+///
+/// The size of a `SocketAddrV6` struct may vary depending on the target operating
+/// system. Do not assume that this type has the same memory layout as the underlying
+/// system representation.
+///
+/// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
+/// [`IPv6` address]: Ipv6Addr
+///
+/// # Examples
+///
+/// ```
+/// use std::net::{Ipv6Addr, SocketAddrV6};
+///
+/// let socket = SocketAddrV6::new(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
+///
+/// assert_eq!("[2001:db8::1]:8080".parse(), Ok(socket));
+/// assert_eq!(socket.ip(), &Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1));
+/// assert_eq!(socket.port(), 8080);
+/// ```
+#[derive(Copy, Clone, Eq, PartialEq)]
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub struct SocketAddrV6 {
+    ip: Ipv6Addr,
+    port: u16,
+    flowinfo: u32,
+    scope_id: u32,
+}
+
+impl SocketAddr {
+    /// Creates a new socket address from an [IP address] and a port number.
+    ///
+    /// [IP address]: IpAddr
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+    ///
+    /// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
+    /// assert_eq!(socket.ip(), IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)));
+    /// assert_eq!(socket.port(), 8080);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))]
+    #[must_use]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn new(ip: IpAddr, port: u16) -> SocketAddr {
+        match ip {
+            IpAddr::V4(a) => SocketAddr::V4(SocketAddrV4::new(a, port)),
+            IpAddr::V6(a) => SocketAddr::V6(SocketAddrV6::new(a, port, 0, 0)),
+        }
+    }
+
+    /// Returns the IP address associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+    ///
+    /// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
+    /// assert_eq!(socket.ip(), IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)));
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn ip(&self) -> IpAddr {
+        match *self {
+            SocketAddr::V4(ref a) => IpAddr::V4(*a.ip()),
+            SocketAddr::V6(ref a) => IpAddr::V6(*a.ip()),
+        }
+    }
+
+    /// Changes the IP address associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+    ///
+    /// let mut socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
+    /// socket.set_ip(IpAddr::V4(Ipv4Addr::new(10, 10, 0, 1)));
+    /// assert_eq!(socket.ip(), IpAddr::V4(Ipv4Addr::new(10, 10, 0, 1)));
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_ip(&mut self, new_ip: IpAddr) {
+        // `match (*self, new_ip)` would have us mutate a copy of self only to throw it away.
+        match (self, new_ip) {
+            (&mut SocketAddr::V4(ref mut a), IpAddr::V4(new_ip)) => a.set_ip(new_ip),
+            (&mut SocketAddr::V6(ref mut a), IpAddr::V6(new_ip)) => a.set_ip(new_ip),
+            (self_, new_ip) => *self_ = Self::new(new_ip, self_.port()),
+        }
+    }
+
+    /// Returns the port number associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+    ///
+    /// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
+    /// assert_eq!(socket.port(), 8080);
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn port(&self) -> u16 {
+        match *self {
+            SocketAddr::V4(ref a) => a.port(),
+            SocketAddr::V6(ref a) => a.port(),
+        }
+    }
+
+    /// Changes the port number associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+    ///
+    /// let mut socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
+    /// socket.set_port(1025);
+    /// assert_eq!(socket.port(), 1025);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_port(&mut self, new_port: u16) {
+        match *self {
+            SocketAddr::V4(ref mut a) => a.set_port(new_port),
+            SocketAddr::V6(ref mut a) => a.set_port(new_port),
+        }
+    }
+
+    /// Returns [`true`] if the [IP address] in this `SocketAddr` is an
+    /// [`IPv4` address], and [`false`] otherwise.
+    ///
+    /// [IP address]: IpAddr
+    /// [`IPv4` address]: IpAddr::V4
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+    ///
+    /// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
+    /// assert_eq!(socket.is_ipv4(), true);
+    /// assert_eq!(socket.is_ipv6(), false);
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_checker", since = "1.16.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn is_ipv4(&self) -> bool {
+        matches!(*self, SocketAddr::V4(_))
+    }
+
+    /// Returns [`true`] if the [IP address] in this `SocketAddr` is an
+    /// [`IPv6` address], and [`false`] otherwise.
+    ///
+    /// [IP address]: IpAddr
+    /// [`IPv6` address]: IpAddr::V6
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{IpAddr, Ipv6Addr, SocketAddr};
+    ///
+    /// let socket = SocketAddr::new(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 65535, 0, 1)), 8080);
+    /// assert_eq!(socket.is_ipv4(), false);
+    /// assert_eq!(socket.is_ipv6(), true);
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_checker", since = "1.16.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn is_ipv6(&self) -> bool {
+        matches!(*self, SocketAddr::V6(_))
+    }
+}
+
+impl SocketAddrV4 {
+    /// Creates a new socket address from an [`IPv4` address] and a port number.
+    ///
+    /// [`IPv4` address]: Ipv4Addr
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV4, Ipv4Addr};
+    ///
+    /// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn new(ip: Ipv4Addr, port: u16) -> SocketAddrV4 {
+        SocketAddrV4 { ip, port }
+    }
+
+    /// Returns the IP address associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV4, Ipv4Addr};
+    ///
+    /// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
+    /// assert_eq!(socket.ip(), &Ipv4Addr::new(127, 0, 0, 1));
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn ip(&self) -> &Ipv4Addr {
+        &self.ip
+    }
+
+    /// Changes the IP address associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV4, Ipv4Addr};
+    ///
+    /// let mut socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
+    /// socket.set_ip(Ipv4Addr::new(192, 168, 0, 1));
+    /// assert_eq!(socket.ip(), &Ipv4Addr::new(192, 168, 0, 1));
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_ip(&mut self, new_ip: Ipv4Addr) {
+        self.ip = new_ip;
+    }
+
+    /// Returns the port number associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV4, Ipv4Addr};
+    ///
+    /// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
+    /// assert_eq!(socket.port(), 8080);
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn port(&self) -> u16 {
+        self.port
+    }
+
+    /// Changes the port number associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV4, Ipv4Addr};
+    ///
+    /// let mut socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
+    /// socket.set_port(4242);
+    /// assert_eq!(socket.port(), 4242);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_port(&mut self, new_port: u16) {
+        self.port = new_port;
+    }
+}
+
+impl SocketAddrV6 {
+    /// Creates a new socket address from an [`IPv6` address], a 16-bit port number,
+    /// and the `flowinfo` and `scope_id` fields.
+    ///
+    /// For more information on the meaning and layout of the `flowinfo` and `scope_id`
+    /// parameters, see [IETF RFC 2553, Section 3.3].
+    ///
+    /// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
+    /// [`IPv6` address]: Ipv6Addr
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[must_use]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn new(ip: Ipv6Addr, port: u16, flowinfo: u32, scope_id: u32) -> SocketAddrV6 {
+        SocketAddrV6 {
+            ip,
+            port,
+            flowinfo,
+            scope_id,
+        }
+    }
+
+    /// Returns the IP address associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
+    /// assert_eq!(socket.ip(), &Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn ip(&self) -> &Ipv6Addr {
+        &self.ip
+    }
+
+    /// Changes the IP address associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
+    /// socket.set_ip(Ipv6Addr::new(76, 45, 0, 0, 0, 0, 0, 0));
+    /// assert_eq!(socket.ip(), &Ipv6Addr::new(76, 45, 0, 0, 0, 0, 0, 0));
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_ip(&mut self, new_ip: Ipv6Addr) {
+        self.ip = new_ip;
+    }
+
+    /// Returns the port number associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
+    /// assert_eq!(socket.port(), 8080);
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn port(&self) -> u16 {
+        self.port
+    }
+
+    /// Changes the port number associated with this socket address.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
+    /// socket.set_port(4242);
+    /// assert_eq!(socket.port(), 4242);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_port(&mut self, new_port: u16) {
+        self.port = new_port;
+    }
+
+    /// Returns the flow information associated with this address.
+    ///
+    /// This information corresponds to the `sin6_flowinfo` field in C's `netinet/in.h`,
+    /// as specified in [IETF RFC 2553, Section 3.3].
+    /// It combines information about the flow label and the traffic class as specified
+    /// in [IETF RFC 2460], respectively [Section 6] and [Section 7].
+    ///
+    /// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
+    /// [IETF RFC 2460]: https://tools.ietf.org/html/rfc2460
+    /// [Section 6]: https://tools.ietf.org/html/rfc2460#section-6
+    /// [Section 7]: https://tools.ietf.org/html/rfc2460#section-7
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 10, 0);
+    /// assert_eq!(socket.flowinfo(), 10);
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn flowinfo(&self) -> u32 {
+        self.flowinfo
+    }
+
+    /// Changes the flow information associated with this socket address.
+    ///
+    /// See [`SocketAddrV6::flowinfo`]'s documentation for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 10, 0);
+    /// socket.set_flowinfo(56);
+    /// assert_eq!(socket.flowinfo(), 56);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_flowinfo(&mut self, new_flowinfo: u32) {
+        self.flowinfo = new_flowinfo;
+    }
+
+    /// Returns the scope ID associated with this address.
+    ///
+    /// This information corresponds to the `sin6_scope_id` field in C's `netinet/in.h`,
+    /// as specified in [IETF RFC 2553, Section 3.3].
+    ///
+    /// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 78);
+    /// assert_eq!(socket.scope_id(), 78);
+    /// ```
+    #[must_use]
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
+    )]
+    pub const fn scope_id(&self) -> u32 {
+        self.scope_id
+    }
+
+    /// Changes the scope ID associated with this socket address.
+    ///
+    /// See [`SocketAddrV6::scope_id`]'s documentation for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::{SocketAddrV6, Ipv6Addr};
+    ///
+    /// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 78);
+    /// socket.set_scope_id(42);
+    /// assert_eq!(socket.scope_id(), 42);
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
+    pub fn set_scope_id(&mut self, new_scope_id: u32) {
+        self.scope_id = new_scope_id;
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_from_ip", since = "1.16.0"))]
+impl From<SocketAddrV4> for SocketAddr {
+    /// Converts a [`SocketAddrV4`] into a [`SocketAddr::V4`].
+    fn from(sock4: SocketAddrV4) -> SocketAddr {
+        SocketAddr::V4(sock4)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "ip_from_ip", since = "1.16.0"))]
+impl From<SocketAddrV6> for SocketAddr {
+    /// Converts a [`SocketAddrV6`] into a [`SocketAddr::V6`].
+    fn from(sock6: SocketAddrV6) -> SocketAddr {
+        SocketAddr::V6(sock6)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "addr_from_into_ip", since = "1.17.0"))]
+impl<I: Into<IpAddr>> From<(I, u16)> for SocketAddr {
+    /// Converts a tuple struct (Into<[`IpAddr`]>, `u16`) into a [`SocketAddr`].
+    ///
+    /// This conversion creates a [`SocketAddr::V4`] for an [`IpAddr::V4`]
+    /// and creates a [`SocketAddr::V6`] for an [`IpAddr::V6`].
+    ///
+    /// `u16` is treated as port of the newly created [`SocketAddr`].
+    fn from(pieces: (I, u16)) -> SocketAddr {
+        SocketAddr::new(pieces.0.into(), pieces.1)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
+impl PartialOrd for SocketAddrV4 {
+    fn partial_cmp(&self, other: &SocketAddrV4) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
+impl PartialOrd for SocketAddrV6 {
+    fn partial_cmp(&self, other: &SocketAddrV6) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
+impl Ord for SocketAddrV4 {
+    fn cmp(&self, other: &SocketAddrV4) -> Ordering {
+        self.ip()
+            .cmp(other.ip())
+            .then(self.port().cmp(&other.port()))
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
+impl Ord for SocketAddrV6 {
+    fn cmp(&self, other: &SocketAddrV6) -> Ordering {
+        self.ip()
+            .cmp(other.ip())
+            .then(self.port().cmp(&other.port()))
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+impl hash::Hash for SocketAddrV4 {
+    fn hash<H: hash::Hasher>(&self, s: &mut H) {
+        (self.port, self.ip).hash(s)
+    }
+}
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+impl hash::Hash for SocketAddrV6 {
+    fn hash<H: hash::Hasher>(&self, s: &mut H) {
+        (self.port, &self.ip, self.flowinfo, self.scope_id).hash(s)
+    }
+}
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/fd/mod.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/fd/mod.rs
new file mode 100644
index 0000000..ea55953
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/fd/mod.rs
@@ -0,0 +1,25 @@
+//! The following is derived from Rust's
+//! library/std/src/os/fd/mod.rs at revision
+//! fa68e73e9947be8ffc5b3b46d899e4953a44e7e9.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+//!
+//! Owned and borrowed Unix-like file descriptors.
+//!
+//! This module is supported on Unix platforms and WASI, which both use a
+//! similar file descriptor system for referencing OS resources.
+
+#![cfg_attr(staged_api, stable(feature = "os_fd", since = "1.66.0"))]
+#![deny(unsafe_op_in_unsafe_fn)]
+
+// `RawFd`, `AsRawFd`, etc.
+mod raw;
+
+// `OwnedFd`, `AsFd`, etc.
+mod owned;
+
+// Export the types and traits for the public API.
+#[cfg_attr(staged_api, stable(feature = "os_fd", since = "1.66.0"))]
+pub use owned::*;
+#[cfg_attr(staged_api, stable(feature = "os_fd", since = "1.66.0"))]
+pub use raw::*;
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/fd/owned.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/fd/owned.rs
new file mode 100644
index 0000000..d765c1d
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/fd/owned.rs
@@ -0,0 +1,294 @@
+//! The following is derived from Rust's
+//! library/std/src/os/fd/owned.rs at revision
+//! 334a54cd83191f38ad8046ed94c45de735c86c65.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+//!
+//! Owned and borrowed Unix-like file descriptors.
+
+#![cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+#![deny(unsafe_op_in_unsafe_fn)]
+#![allow(unsafe_code)]
+
+use super::raw::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+use crate::io::close;
+use core::fmt;
+use core::marker::PhantomData;
+use core::mem::forget;
+
+/// A borrowed file descriptor.
+///
+/// This has a lifetime parameter to tie it to the lifetime of something that owns the file
+/// descriptor. For the duration of that lifetime, it is guaranteed that nobody will close the file
+/// descriptor.
+///
+/// This uses `repr(transparent)` and has the representation of a host file
+/// descriptor, so it can be used in FFI in places where a file descriptor is
+/// passed as an argument, it is not captured or consumed, and it never has the
+/// value `-1`.
+///
+/// This type's `.to_owned()` implementation returns another `BorrowedFd`
+/// rather than an `OwnedFd`. It just makes a trivial copy of the raw file
+/// descriptor, which is then borrowed under the same lifetime.
+#[derive(Copy, Clone)]
+#[repr(transparent)]
+#[cfg_attr(rustc_attrs, rustc_layout_scalar_valid_range_start(0))]
+// libstd/os/raw/mod.rs assures me that every libstd-supported platform has a
+// 32-bit c_int. Below is -2, in two's complement, but that only works out
+// because c_int is 32 bits.
+#[cfg_attr(rustc_attrs, rustc_layout_scalar_valid_range_end(0xFF_FF_FF_FE))]
+#[cfg_attr(rustc_attrs, rustc_nonnull_optimization_guaranteed)]
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+pub struct BorrowedFd<'fd> {
+    fd: RawFd,
+    _phantom: PhantomData<&'fd OwnedFd>,
+}
+
+/// An owned file descriptor.
+///
+/// This closes the file descriptor on drop. It is guaranteed that nobody else will close the file
+/// descriptor.
+///
+/// This uses `repr(transparent)` and has the representation of a host file
+/// descriptor, so it can be used in FFI in places where a file descriptor is
+/// passed as a consumed argument or returned as an owned value, and it never
+/// has the value `-1`.
+#[repr(transparent)]
+#[cfg_attr(rustc_attrs, rustc_layout_scalar_valid_range_start(0))]
+// libstd/os/raw/mod.rs assures me that every libstd-supported platform has a
+// 32-bit c_int. Below is -2, in two's complement, but that only works out
+// because c_int is 32 bits.
+#[cfg_attr(rustc_attrs, rustc_layout_scalar_valid_range_end(0xFF_FF_FF_FE))]
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+#[cfg_attr(rustc_attrs, rustc_nonnull_optimization_guaranteed)]
+pub struct OwnedFd {
+    fd: RawFd,
+}
+
+impl BorrowedFd<'_> {
+    /// Return a `BorrowedFd` holding the given raw file descriptor.
+    ///
+    /// # Safety
+    ///
+    /// The resource pointed to by `fd` must remain open for the duration of
+    /// the returned `BorrowedFd`, and it must not have the value `-1`.
+    #[inline]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "io_safety", since = "1.63.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+    pub const unsafe fn borrow_raw(fd: RawFd) -> Self {
+        assert!(fd != u32::MAX as RawFd);
+        // SAFETY: we just asserted that the value is in the valid range and isn't `-1` (the only value bigger than `0xFF_FF_FF_FE` unsigned)
+        #[allow(unused_unsafe)]
+        unsafe {
+            Self {
+                fd,
+                _phantom: PhantomData,
+            }
+        }
+    }
+}
+
+impl OwnedFd {
+    /// Creates a new `OwnedFd` instance that shares the same underlying file handle
+    /// as the existing `OwnedFd` instance.
+    #[cfg(not(target_arch = "wasm32"))]
+    pub fn try_clone(&self) -> crate::io::Result<Self> {
+        // We want to atomically duplicate this file descriptor and set the
+        // CLOEXEC flag, and currently that's done via F_DUPFD_CLOEXEC. This
+        // is a POSIX flag that was added to Linux in 2.6.24.
+        #[cfg(not(target_os = "espidf"))]
+        let fd = crate::io::fcntl_dupfd_cloexec(self, 0)?;
+
+        // For ESP-IDF, F_DUPFD is used instead, because the CLOEXEC semantics
+        // will never be supported, as this is a bare metal framework with
+        // no capabilities for multi-process execution. While F_DUPFD is also
+        // not supported yet, it might be (currently it returns ENOSYS).
+        #[cfg(target_os = "espidf")]
+        let fd = crate::io::fcntl_dupfd(self)?;
+
+        Ok(fd.into())
+    }
+
+    /// Creates a new `OwnedFd` instance that shares the same underlying file handle
+    /// as the existing `OwnedFd` instance.
+    #[cfg(target_arch = "wasm32")]
+    pub fn try_clone(&self) -> crate::io::Result<Self> {
+        Err(crate::io::Errno::NOSYS)
+    }
+}
+
+impl BorrowedFd<'_> {
+    /// Creates a new `OwnedFd` instance that shares the same underlying file
+    /// description as the existing `BorrowedFd` instance.
+    #[cfg(not(any(target_arch = "wasm32", target_os = "hermit")))]
+    #[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+    pub fn try_clone_to_owned(&self) -> crate::io::Result<OwnedFd> {
+        // Avoid using file descriptors below 3 as they are used for stdio
+
+        // We want to atomically duplicate this file descriptor and set the
+        // CLOEXEC flag, and currently that's done via F_DUPFD_CLOEXEC. This
+        // is a POSIX flag that was added to Linux in 2.6.24.
+        #[cfg(not(target_os = "espidf"))]
+        let fd = crate::io::fcntl_dupfd_cloexec(self, 3)?;
+
+        // For ESP-IDF, F_DUPFD is used instead, because the CLOEXEC semantics
+        // will never be supported, as this is a bare metal framework with
+        // no capabilities for multi-process execution. While F_DUPFD is also
+        // not supported yet, it might be (currently it returns ENOSYS).
+        #[cfg(target_os = "espidf")]
+        let fd = crate::io::fcntl_dupfd(self, 3)?;
+
+        Ok(fd)
+    }
+
+    /// Creates a new `OwnedFd` instance that shares the same underlying file
+    /// description as the existing `BorrowedFd` instance.
+    #[cfg(any(target_arch = "wasm32", target_os = "hermit"))]
+    #[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+    pub fn try_clone_to_owned(&self) -> crate::io::Result<OwnedFd> {
+        Err(crate::io::Errno::NOSYS)
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl AsRawFd for BorrowedFd<'_> {
+    #[inline]
+    fn as_raw_fd(&self) -> RawFd {
+        self.fd
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl AsRawFd for OwnedFd {
+    #[inline]
+    fn as_raw_fd(&self) -> RawFd {
+        self.fd
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl IntoRawFd for OwnedFd {
+    #[inline]
+    fn into_raw_fd(self) -> RawFd {
+        let fd = self.fd;
+        forget(self);
+        fd
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl FromRawFd for OwnedFd {
+    /// Constructs a new instance of `Self` from the given raw file descriptor.
+    ///
+    /// # Safety
+    ///
+    /// The resource pointed to by `fd` must be open and suitable for assuming
+    /// [ownership][io-safety]. The resource must not require any cleanup other than `close`.
+    ///
+    /// [io-safety]: io#io-safety
+    #[inline]
+    unsafe fn from_raw_fd(fd: RawFd) -> Self {
+        assert_ne!(fd, u32::MAX as RawFd);
+        // SAFETY: we just asserted that the value is in the valid range and isn't `-1` (the only value bigger than `0xFF_FF_FF_FE` unsigned)
+        #[allow(unused_unsafe)]
+        unsafe {
+            Self { fd }
+        }
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl Drop for OwnedFd {
+    #[inline]
+    fn drop(&mut self) {
+        unsafe {
+            // Errors are ignored when closing a file descriptor. The reason
+            // for this is that if an error occurs we don't actually know if
+            // the file descriptor was closed or not, and if we retried (for
+            // something like EINTR), we might close another valid file
+            // descriptor opened after we closed ours.
+            close(self.fd as _);
+        }
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl fmt::Debug for BorrowedFd<'_> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("BorrowedFd").field("fd", &self.fd).finish()
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl fmt::Debug for OwnedFd {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("OwnedFd").field("fd", &self.fd).finish()
+    }
+}
+
+/// A trait to borrow the file descriptor from an underlying object.
+///
+/// This is only available on unix platforms and must be imported in order to
+/// call the method. Windows platforms have a corresponding `AsHandle` and
+/// `AsSocket` set of traits.
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+pub trait AsFd {
+    /// Borrows the file descriptor.
+    ///
+    /// # Example
+    ///
+    /// ```no_run
+    /// # #![feature(io_safety)]
+    /// use std::fs::File;
+    /// # use std::io;
+    /// # #[cfg(target_os = "wasi")]
+    /// # use std::os::wasi::io::{AsFd, BorrowedFd};
+    /// # #[cfg(unix)]
+    /// # use std::os::unix::io::{AsFd, BorrowedFd};
+    ///
+    /// let mut f = File::open("foo.txt")?;
+    /// # #[cfg(any(unix, target_os = "wasi"))]
+    /// let borrowed_fd: BorrowedFd<'_> = f.as_fd();
+    /// # Ok::<(), io::Error>(())
+    /// ```
+    #[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+    fn as_fd(&self) -> BorrowedFd<'_>;
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl<T: AsFd> AsFd for &T {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        T::as_fd(self)
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl<T: AsFd> AsFd for &mut T {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        T::as_fd(self)
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl AsFd for BorrowedFd<'_> {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        *self
+    }
+}
+
+#[cfg_attr(staged_api, unstable(feature = "io_safety", issue = "87074"))]
+impl AsFd for OwnedFd {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        // SAFETY: `OwnedFd` and `BorrowedFd` have the same validity
+        // invariants, and the `BorrowedFd` is bounded by the lifetime
+        // of `&self`.
+        unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) }
+    }
+}
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/fd/raw.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/fd/raw.rs
new file mode 100644
index 0000000..8f6b75a
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/fd/raw.rs
@@ -0,0 +1,164 @@
+//! The following is derived from Rust's
+//! library/std/src/os/fd/raw.rs at revision
+//! 334a54cd83191f38ad8046ed94c45de735c86c65.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+//!
+//! Raw Unix-like file descriptors.
+
+#![cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+#![allow(unsafe_code)]
+
+use crate::backend::c;
+
+/// Raw file descriptors.
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub type RawFd = c::c_int;
+
+/// A trait to extract the raw file descriptor from an underlying object.
+///
+/// This is only available on unix and WASI platforms and must be imported in
+/// order to call the method. Windows platforms have a corresponding
+/// `AsRawHandle` and `AsRawSocket` set of traits.
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub trait AsRawFd {
+    /// Extracts the raw file descriptor.
+    ///
+    /// This function is typically used to **borrow** an owned file descriptor.
+    /// When used in this way, this method does **not** pass ownership of the
+    /// raw file descriptor to the caller, and the file descriptor is only
+    /// guaranteed to be valid while the original object has not yet been
+    /// destroyed.
+    ///
+    /// However, borrowing is not strictly required. See [`AsFd::as_fd`]
+    /// for an API which strictly borrows a file descriptor.
+    ///
+    /// # Example
+    ///
+    /// ```no_run
+    /// use std::fs::File;
+    /// # use std::io;
+    /// #[cfg(unix)]
+    /// use std::os::unix::io::{AsRawFd, RawFd};
+    /// #[cfg(target_os = "wasi")]
+    /// use std::os::wasi::io::{AsRawFd, RawFd};
+    ///
+    /// let mut f = File::open("foo.txt")?;
+    /// // `raw_fd` is only valid as long as `f` exists.
+    /// #[cfg(any(unix, target_os = "wasi"))]
+    /// let raw_fd: RawFd = f.as_raw_fd();
+    /// # Ok::<(), io::Error>(())
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    fn as_raw_fd(&self) -> RawFd;
+}
+
+/// A trait to express the ability to construct an object from a raw file
+/// descriptor.
+#[cfg_attr(staged_api, stable(feature = "from_raw_os", since = "1.1.0"))]
+pub trait FromRawFd {
+    /// Constructs a new instance of `Self` from the given raw file
+    /// descriptor.
+    ///
+    /// This function is typically used to **consume ownership** of the
+    /// specified file descriptor. When used in this way, the returned object
+    /// will take responsibility for closing it when the object goes out of
+    /// scope.
+    ///
+    /// However, consuming ownership is not strictly required. Use a
+    /// [`From<OwnedFd>::from`] implementation for an API which strictly
+    /// consumes ownership.
+    ///
+    /// # Safety
+    ///
+    /// The `fd` passed in must be an [owned file descriptor][io-safety];
+    /// in particular, it must be open.
+    ///
+    /// [io-safety]: io#io-safety
+    ///
+    /// # Example
+    ///
+    /// ```no_run
+    /// use std::fs::File;
+    /// # use std::io;
+    /// #[cfg(unix)]
+    /// use std::os::unix::io::{FromRawFd, IntoRawFd, RawFd};
+    /// #[cfg(target_os = "wasi")]
+    /// use std::os::wasi::io::{FromRawFd, IntoRawFd, RawFd};
+    ///
+    /// let f = File::open("foo.txt")?;
+    /// # #[cfg(any(unix, target_os = "wasi"))]
+    /// let raw_fd: RawFd = f.into_raw_fd();
+    /// // SAFETY: no other functions should call `from_raw_fd`, so there
+    /// // is only one owner for the file descriptor.
+    /// # #[cfg(any(unix, target_os = "wasi"))]
+    /// let f = unsafe { File::from_raw_fd(raw_fd) };
+    /// # Ok::<(), io::Error>(())
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "from_raw_os", since = "1.1.0"))]
+    unsafe fn from_raw_fd(fd: RawFd) -> Self;
+}
+
+/// A trait to express the ability to consume an object and acquire ownership of
+/// its raw file descriptor.
+#[cfg_attr(staged_api, stable(feature = "into_raw_os", since = "1.4.0"))]
+pub trait IntoRawFd {
+    /// Consumes this object, returning the raw underlying file descriptor.
+    ///
+    /// This function is typically used to **transfer ownership** of the underlying
+    /// file descriptor to the caller. When used in this way, callers are then the unique
+    /// owners of the file descriptor and must close it once it's no longer needed.
+    ///
+    /// However, transferring ownership is not strictly required. Use a
+    /// [`Into<OwnedFd>::into`] implementation for an API which strictly
+    /// transfers ownership.
+    ///
+    /// # Example
+    ///
+    /// ```no_run
+    /// use std::fs::File;
+    /// # use std::io;
+    /// #[cfg(unix)]
+    /// use std::os::unix::io::{IntoRawFd, RawFd};
+    /// #[cfg(target_os = "wasi")]
+    /// use std::os::wasi::io::{IntoRawFd, RawFd};
+    ///
+    /// let f = File::open("foo.txt")?;
+    /// #[cfg(any(unix, target_os = "wasi"))]
+    /// let raw_fd: RawFd = f.into_raw_fd();
+    /// # Ok::<(), io::Error>(())
+    /// ```
+    #[cfg_attr(staged_api, stable(feature = "into_raw_os", since = "1.4.0"))]
+    fn into_raw_fd(self) -> RawFd;
+}
+
+#[cfg_attr(
+    staged_api,
+    stable(feature = "raw_fd_reflexive_traits", since = "1.48.0")
+)]
+impl AsRawFd for RawFd {
+    #[inline]
+    fn as_raw_fd(&self) -> RawFd {
+        *self
+    }
+}
+#[cfg_attr(
+    staged_api,
+    stable(feature = "raw_fd_reflexive_traits", since = "1.48.0")
+)]
+impl IntoRawFd for RawFd {
+    #[inline]
+    fn into_raw_fd(self) -> RawFd {
+        self
+    }
+}
+#[cfg_attr(
+    staged_api,
+    stable(feature = "raw_fd_reflexive_traits", since = "1.48.0")
+)]
+impl FromRawFd for RawFd {
+    #[inline]
+    unsafe fn from_raw_fd(fd: RawFd) -> RawFd {
+        fd
+    }
+}
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/mod.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/mod.rs
new file mode 100644
index 0000000..67f41f5
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/mod.rs
@@ -0,0 +1,4 @@
+#[cfg(any(unix, target_os = "wasi"))]
+pub mod fd;
+#[cfg(windows)]
+pub mod windows;
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/mod.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/mod.rs
new file mode 100644
index 0000000..77abd03
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/mod.rs
@@ -0,0 +1,5 @@
+mod raw;
+mod socket;
+
+pub use raw::{AsRawSocket, FromRawSocket, IntoRawSocket, RawSocket};
+pub use socket::{AsSocket, BorrowedSocket, OwnedSocket};
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/raw.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/raw.rs
new file mode 100644
index 0000000..1e73e00
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/raw.rs
@@ -0,0 +1,71 @@
+//! The following is derived from Rust's
+//! library/std/src/os/windows/io/raw.rs
+//! at revision
+//! 4f9b394c8a24803e57ba892fa00e539742ebafc0.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+
+use super::super::raw;
+
+/// Raw SOCKETs.
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub type RawSocket = raw::SOCKET;
+
+/// Extracts raw sockets.
+#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+pub trait AsRawSocket {
+    /// Extracts the raw socket.
+    ///
+    /// This function is typically used to **borrow** an owned socket.
+    /// When used in this way, this method does **not** pass ownership of the
+    /// raw socket to the caller, and the socket is only guaranteed
+    /// to be valid while the original object has not yet been destroyed.
+    ///
+    /// However, borrowing is not strictly required. See [`AsSocket::as_socket`]
+    /// for an API which strictly borrows a socket.
+    #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
+    fn as_raw_socket(&self) -> RawSocket;
+}
+
+/// Creates I/O objects from raw sockets.
+#[cfg_attr(staged_api, stable(feature = "from_raw_os", since = "1.1.0"))]
+pub trait FromRawSocket {
+    /// Constructs a new I/O object from the specified raw socket.
+    ///
+    /// This function is typically used to **consume ownership** of the socket
+    /// given, passing responsibility for closing the socket to the returned
+    /// object. When used in this way, the returned object
+    /// will take responsibility for closing it when the object goes out of
+    /// scope.
+    ///
+    /// However, consuming ownership is not strictly required. Use a
+    /// `From<OwnedSocket>::from` implementation for an API which strictly
+    /// consumes ownership.
+    ///
+    /// # Safety
+    ///
+    /// The `socket` passed in must:
+    ///   - be a valid an open socket,
+    ///   - be a socket that may be freed via [`closesocket`].
+    ///
+    /// [`closesocket`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-closesocket
+    #[cfg_attr(staged_api, stable(feature = "from_raw_os", since = "1.1.0"))]
+    unsafe fn from_raw_socket(sock: RawSocket) -> Self;
+}
+
+/// A trait to express the ability to consume an object and acquire ownership of
+/// its raw `SOCKET`.
+#[cfg_attr(staged_api, stable(feature = "into_raw_os", since = "1.4.0"))]
+pub trait IntoRawSocket {
+    /// Consumes this object, returning the raw underlying socket.
+    ///
+    /// This function is typically used to **transfer ownership** of the underlying
+    /// socket to the caller. When used in this way, callers are then the unique
+    /// owners of the socket and must close it once it's no longer needed.
+    ///
+    /// However, transferring ownership is not strictly required. Use a
+    /// `Into<OwnedSocket>::into` implementation for an API which strictly
+    /// transfers ownership.
+    #[cfg_attr(staged_api, stable(feature = "into_raw_os", since = "1.4.0"))]
+    fn into_raw_socket(self) -> RawSocket;
+}
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/socket.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/socket.rs
new file mode 100644
index 0000000..bc637aa
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/io/socket.rs
@@ -0,0 +1,199 @@
+//! The following is derived from Rust's
+//! library/std/src/os/windows/io/socket.rs
+//! at revision
+//! 4f9b394c8a24803e57ba892fa00e539742ebafc0.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+
+use super::raw::*;
+use crate::backend::c;
+use crate::backend::fd::LibcFd as LibcSocket;
+use core::fmt;
+use core::marker::PhantomData;
+use core::mem::forget;
+
+/// A borrowed socket.
+///
+/// This has a lifetime parameter to tie it to the lifetime of something that
+/// owns the socket.
+///
+/// This uses `repr(transparent)` and has the representation of a host socket,
+/// so it can be used in FFI in places where a socket is passed as an argument,
+/// it is not captured or consumed, and it never has the value
+/// `INVALID_SOCKET`.
+///
+/// This type's `.to_owned()` implementation returns another `BorrowedSocket`
+/// rather than an `OwnedSocket`. It just makes a trivial copy of the raw
+/// socket, which is then borrowed under the same lifetime.
+#[derive(Copy, Clone)]
+#[repr(transparent)]
+#[cfg_attr(staged_api, rustc_layout_scalar_valid_range_start(0))]
+// This is -2, in two's complement. -1 is `INVALID_SOCKET`.
+#[cfg_attr(
+    all(staged_api, target_pointer_width = "32"),
+    rustc_layout_scalar_valid_range_end(0xFF_FF_FF_FE)
+)]
+#[cfg_attr(
+    all(staged_api, target_pointer_width = "64"),
+    rustc_layout_scalar_valid_range_end(0xFF_FF_FF_FF_FF_FF_FF_FE)
+)]
+#[cfg_attr(staged_api, rustc_nonnull_optimization_guaranteed)]
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+pub struct BorrowedSocket<'socket> {
+    socket: RawSocket,
+    _phantom: PhantomData<&'socket OwnedSocket>,
+}
+
+/// An owned socket.
+///
+/// This closes the socket on drop.
+///
+/// This uses `repr(transparent)` and has the representation of a host socket,
+/// so it can be used in FFI in places where a socket is passed as a consumed
+/// argument or returned as an owned value, and it never has the value
+/// `INVALID_SOCKET`.
+#[repr(transparent)]
+#[cfg_attr(staged_api, rustc_layout_scalar_valid_range_start(0))]
+// This is -2, in two's complement. -1 is `INVALID_SOCKET`.
+#[cfg_attr(
+    all(staged_api, target_pointer_width = "32"),
+    rustc_layout_scalar_valid_range_end(0xFF_FF_FF_FE)
+)]
+#[cfg_attr(
+    all(staged_api, target_pointer_width = "64"),
+    rustc_layout_scalar_valid_range_end(0xFF_FF_FF_FF_FF_FF_FF_FE)
+)]
+#[cfg_attr(staged_api, rustc_nonnull_optimization_guaranteed)]
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+pub struct OwnedSocket {
+    socket: RawSocket,
+}
+
+impl BorrowedSocket<'_> {
+    /// Return a `BorrowedSocket` holding the given raw socket.
+    ///
+    /// # Safety
+    ///
+    /// The resource pointed to by `raw` must remain open for the duration of
+    /// the returned `BorrowedSocket`, and it must not have the value
+    /// `INVALID_SOCKET`.
+    #[inline]
+    #[cfg_attr(
+        staged_api,
+        rustc_const_stable(feature = "io_safety", since = "1.63.0")
+    )]
+    #[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+    pub const unsafe fn borrow_raw(socket: RawSocket) -> Self {
+        assert!(socket != c::INVALID_SOCKET as RawSocket);
+        Self {
+            socket,
+            _phantom: PhantomData,
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl AsRawSocket for BorrowedSocket<'_> {
+    #[inline]
+    fn as_raw_socket(&self) -> RawSocket {
+        self.socket
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl AsRawSocket for OwnedSocket {
+    #[inline]
+    fn as_raw_socket(&self) -> RawSocket {
+        self.socket
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl IntoRawSocket for OwnedSocket {
+    #[inline]
+    fn into_raw_socket(self) -> RawSocket {
+        let socket = self.socket;
+        forget(self);
+        socket
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl FromRawSocket for OwnedSocket {
+    #[inline]
+    unsafe fn from_raw_socket(socket: RawSocket) -> Self {
+        debug_assert_ne!(socket, c::INVALID_SOCKET as RawSocket);
+        Self { socket }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl Drop for OwnedSocket {
+    #[inline]
+    fn drop(&mut self) {
+        unsafe {
+            let _ = c::closesocket(self.socket as LibcSocket);
+        }
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl fmt::Debug for BorrowedSocket<'_> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("BorrowedSocket")
+            .field("socket", &self.socket)
+            .finish()
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl fmt::Debug for OwnedSocket {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("OwnedSocket")
+            .field("socket", &self.socket)
+            .finish()
+    }
+}
+
+/// A trait to borrow the socket from an underlying object.
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+pub trait AsSocket {
+    /// Borrows the socket.
+    #[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+    fn as_socket(&self) -> BorrowedSocket<'_>;
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl<T: AsSocket> AsSocket for &T {
+    #[inline]
+    fn as_socket(&self) -> BorrowedSocket<'_> {
+        T::as_socket(self)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl<T: AsSocket> AsSocket for &mut T {
+    #[inline]
+    fn as_socket(&self) -> BorrowedSocket<'_> {
+        T::as_socket(self)
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl AsSocket for BorrowedSocket<'_> {
+    #[inline]
+    fn as_socket(&self) -> BorrowedSocket<'_> {
+        *self
+    }
+}
+
+#[cfg_attr(staged_api, stable(feature = "io_safety", since = "1.63.0"))]
+impl AsSocket for OwnedSocket {
+    #[inline]
+    fn as_socket(&self) -> BorrowedSocket<'_> {
+        // Safety: `OwnedSocket` and `BorrowedSocket` have the same validity
+        // invariants, and the `BorrowdSocket` is bounded by the lifetime
+        // of `&self`.
+        unsafe { BorrowedSocket::borrow_raw(self.as_raw_socket()) }
+    }
+}
diff --git a/vendor/rustix/src/maybe_polyfill/no_std/os/windows/mod.rs b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/mod.rs
new file mode 100644
index 0000000..02f3894
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/os/windows/mod.rs
@@ -0,0 +1,19 @@
+//! The following is derived from Rust's
+//! library/std/src/os/windows/raw.rs,
+//! library/std/src/os/windows/io/raw.rs and
+//! library/std/src/os/windows/io/socket.rs
+//! at revision
+//! 4f9b394c8a24803e57ba892fa00e539742ebafc0.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+
+mod raw {
+    #[cfg(target_pointer_width = "32")]
+    #[cfg_attr(staged_api, stable(feature = "raw_ext", since = "1.1.0"))]
+    pub type SOCKET = u32;
+    #[cfg(target_pointer_width = "64")]
+    #[cfg_attr(staged_api, stable(feature = "raw_ext", since = "1.1.0"))]
+    pub type SOCKET = u64;
+}
+
+pub mod io;
diff --git a/vendor/rustix/src/maybe_polyfill/std/mod.rs b/vendor/rustix/src/maybe_polyfill/std/mod.rs
new file mode 100644
index 0000000..bcaceb9
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/std/mod.rs
@@ -0,0 +1,43 @@
+//! Imports from `std` that would be polyfilled for `no_std` builds (see
+//! `src/polyfill/no_std`).
+//!
+//! This implementation is used when `std` is available and just imports the
+//! necessary items from `std`. For `no_std` builds, the file
+//! `src/polyfill/no_std` is used instead, which doesn't depend on the standard
+//! library.
+
+#[cfg(not(windows))]
+pub mod io {
+    pub use std::io::{IoSlice, IoSliceMut};
+}
+
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+#[cfg(feature = "net")]
+pub mod net {
+    pub use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
+}
+
+pub mod os {
+    pub mod fd {
+        // Change  to use `std::os::fd` when MSRV becomes 1.66 or higher.
+
+        #[cfg(unix)]
+        pub use std::os::unix::io::{
+            AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd,
+        };
+        #[cfg(target_os = "wasi")]
+        pub use std::os::wasi::io::{
+            AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd,
+        };
+    }
+
+    #[cfg(windows)]
+    pub mod windows {
+        pub mod io {
+            pub use std::os::windows::io::{
+                AsRawSocket, AsSocket, BorrowedSocket, FromRawSocket, IntoRawSocket, OwnedSocket,
+                RawSocket,
+            };
+        }
+    }
+}
diff --git a/vendor/rustix/src/mm/madvise.rs b/vendor/rustix/src/mm/madvise.rs
new file mode 100644
index 0000000..4015d12
--- /dev/null
+++ b/vendor/rustix/src/mm/madvise.rs
@@ -0,0 +1,49 @@
+//! The `madvise` function.
+//!
+//! # Safety
+//!
+//! `madvise` operates on a raw pointer. Some forms of `madvise` may
+//! mutate the memory or have other side effects.
+#![allow(unsafe_code)]
+
+use crate::{backend, io};
+use core::ffi::c_void;
+
+pub use backend::mm::types::Advice;
+
+/// `posix_madvise(addr, len, advice)`—Declares an expected access pattern
+/// for a memory-mapped file.
+///
+/// # Safety
+///
+/// `addr` must be a valid pointer to memory that is appropriate to call
+/// `posix_madvise` on. Some forms of `advice` may mutate the memory or evoke a
+/// variety of side-effects on the mapping and/or the file.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux `madvise`]
+///  - [Linux `posix_madvise`]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_madvise.html
+/// [Linux `madvise`]: https://man7.org/linux/man-pages/man2/madvise.2.html
+/// [Linux `posix_madvise`]: https://man7.org/linux/man-pages/man3/posix_madvise.3.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/madvise.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=madvise&sektion=2
+/// [NetBSD]: https://man.netbsd.org/madvise.2
+/// [OpenBSD]: https://man.openbsd.org/madvise.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=madvise&section=2
+/// [illumos]: https://illumos.org/man/3C/madvise
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Memory_002dmapped-I_002fO.html#index-madvise
+#[inline]
+#[doc(alias = "posix_madvise")]
+pub unsafe fn madvise(addr: *mut c_void, len: usize, advice: Advice) -> io::Result<()> {
+    backend::mm::syscalls::madvise(addr, len, advice)
+}
diff --git a/vendor/rustix/src/mm/mmap.rs b/vendor/rustix/src/mm/mmap.rs
new file mode 100644
index 0000000..3f6523f
--- /dev/null
+++ b/vendor/rustix/src/mm/mmap.rs
@@ -0,0 +1,409 @@
+//! The `mmap` API.
+//!
+//! # Safety
+//!
+//! `mmap` and related functions manipulate raw pointers and have special
+//! semantics and are wildly unsafe.
+#![allow(unsafe_code)]
+
+use crate::{backend, io};
+use backend::fd::AsFd;
+use core::ffi::c_void;
+
+#[cfg(any(linux_kernel, freebsdlike, netbsdlike))]
+pub use backend::mm::types::MlockAllFlags;
+#[cfg(linux_kernel)]
+pub use backend::mm::types::MlockFlags;
+#[cfg(any(target_os = "emscripten", target_os = "linux"))]
+pub use backend::mm::types::MremapFlags;
+pub use backend::mm::types::{MapFlags, MprotectFlags, ProtFlags};
+
+impl MapFlags {
+    /// Create `MAP_HUGETLB` with provided size of huge page.
+    ///
+    /// Under the hood it computes
+    /// `MAP_HUGETLB | (huge_page_size_log2 << MAP_HUGE_SHIFT)`.
+    /// `huge_page_size_log2` denotes logarithm of huge page size to use and
+    /// should be between 16 and 63 (inclusive).
+    ///
+    /// ```
+    /// use rustix::mm::MapFlags;
+    ///
+    /// let f = MapFlags::hugetlb_with_size_log2(30).unwrap();
+    /// assert_eq!(f, MapFlags::HUGETLB | MapFlags::HUGE_1GB);
+    /// ```
+    #[cfg(linux_kernel)]
+    pub const fn hugetlb_with_size_log2(huge_page_size_log2: u32) -> Option<Self> {
+        use linux_raw_sys::general::{MAP_HUGETLB, MAP_HUGE_SHIFT};
+        if 16 <= huge_page_size_log2 && huge_page_size_log2 <= 63 {
+            let bits = MAP_HUGETLB | (huge_page_size_log2 << MAP_HUGE_SHIFT);
+            Self::from_bits(bits)
+        } else {
+            None
+        }
+    }
+}
+
+/// `mmap(ptr, len, prot, flags, fd, offset)`—Create a file-backed memory
+/// mapping.
+///
+/// For anonymous mappings (`MAP_ANON`/`MAP_ANONYMOUS`), see
+/// [`mmap_anonymous`].
+///
+/// # Safety
+///
+/// Raw pointers and lots of special semantics.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/mmap.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/mmap.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/mmap.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=mmap&sektion=2
+/// [NetBSD]: https://man.netbsd.org/mmap.2
+/// [OpenBSD]: https://man.openbsd.org/mmap.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=mmap&section=2
+/// [illumos]: https://illumos.org/man/2/mmap
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Memory_002dmapped-I_002fO.html#index-mmap
+#[inline]
+pub unsafe fn mmap<Fd: AsFd>(
+    ptr: *mut c_void,
+    len: usize,
+    prot: ProtFlags,
+    flags: MapFlags,
+    fd: Fd,
+    offset: u64,
+) -> io::Result<*mut c_void> {
+    backend::mm::syscalls::mmap(ptr, len, prot, flags, fd.as_fd(), offset)
+}
+
+/// `mmap(ptr, len, prot, MAP_ANONYMOUS | flags, -1, 0)`—Create an anonymous
+/// memory mapping.
+///
+/// For file-backed mappings, see [`mmap`].
+///
+/// # Safety
+///
+/// Raw pointers and lots of special semantics.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/mmap.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/mmap.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/mmap.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=mmap&sektion=2
+/// [NetBSD]: https://man.netbsd.org/mmap.2
+/// [OpenBSD]: https://man.openbsd.org/mmap.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=mmap&section=2
+/// [illumos]: https://illumos.org/man/2/mmap
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Memory_002dmapped-I_002fO.html#index-mmap
+#[inline]
+#[doc(alias = "mmap")]
+pub unsafe fn mmap_anonymous(
+    ptr: *mut c_void,
+    len: usize,
+    prot: ProtFlags,
+    flags: MapFlags,
+) -> io::Result<*mut c_void> {
+    backend::mm::syscalls::mmap_anonymous(ptr, len, prot, flags)
+}
+
+/// `munmap(ptr, len)`—Remove a memory mapping.
+///
+/// # Safety
+///
+/// Raw pointers and lots of special semantics.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/munmap.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/munmap.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/munmap.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=munmap&sektion=2
+/// [NetBSD]: https://man.netbsd.org/munmap.2
+/// [OpenBSD]: https://man.openbsd.org/munmap.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=munmap&section=2
+/// [illumos]: https://illumos.org/man/2/munmap
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Memory_002dmapped-I_002fO.html#index-munmap
+#[inline]
+pub unsafe fn munmap(ptr: *mut c_void, len: usize) -> io::Result<()> {
+    backend::mm::syscalls::munmap(ptr, len)
+}
+
+/// `mremap(old_address, old_size, new_size, flags)`—Resize, modify, and/or
+/// move a memory mapping.
+///
+/// For moving a mapping to a fixed address (`MREMAP_FIXED`), see
+/// [`mremap_fixed`].
+///
+/// # Safety
+///
+/// Raw pointers and lots of special semantics.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/mremap.2.html
+#[cfg(any(target_os = "emscripten", target_os = "linux"))]
+#[inline]
+pub unsafe fn mremap(
+    old_address: *mut c_void,
+    old_size: usize,
+    new_size: usize,
+    flags: MremapFlags,
+) -> io::Result<*mut c_void> {
+    backend::mm::syscalls::mremap(old_address, old_size, new_size, flags)
+}
+
+/// `mremap(old_address, old_size, new_size, MREMAP_FIXED | flags)`—Resize,
+/// modify, and/or move a memory mapping to a specific address.
+///
+/// For `mremap` without moving to a specific address, see [`mremap`].
+/// [`mremap_fixed`].
+///
+/// # Safety
+///
+/// Raw pointers and lots of special semantics.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/mremap.2.html
+#[cfg(any(target_os = "emscripten", target_os = "linux"))]
+#[inline]
+#[doc(alias = "mremap")]
+pub unsafe fn mremap_fixed(
+    old_address: *mut c_void,
+    old_size: usize,
+    new_size: usize,
+    flags: MremapFlags,
+    new_address: *mut c_void,
+) -> io::Result<*mut c_void> {
+    backend::mm::syscalls::mremap_fixed(old_address, old_size, new_size, flags, new_address)
+}
+
+/// `mprotect(ptr, len, flags)`—Change the protection flags of a region of
+/// memory.
+///
+/// # Safety
+///
+/// Raw pointers and lots of special semantics.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/mprotect.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/mprotect.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/mprotect.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=mprotect&sektion=2
+/// [NetBSD]: https://man.netbsd.org/mprotect.2
+/// [OpenBSD]: https://man.openbsd.org/mprotect.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=mprotect&section=2
+/// [illumos]: https://illumos.org/man/2/mprotect
+#[inline]
+pub unsafe fn mprotect(ptr: *mut c_void, len: usize, flags: MprotectFlags) -> io::Result<()> {
+    backend::mm::syscalls::mprotect(ptr, len, flags)
+}
+
+/// `mlock(ptr, len)`—Lock memory into RAM.
+///
+/// # Safety
+///
+/// This function operates on raw pointers, but it should only be used on
+/// memory which the caller owns. Technically, locking memory shouldn't violate
+/// any invariants, but since unlocking it can violate invariants, this
+/// function is also unsafe for symmetry.
+///
+/// Some implementations implicitly round the memory region out to the nearest
+/// page boundaries, so this function may lock more memory than explicitly
+/// requested if the memory isn't page-aligned. Other implementations fail if
+/// the memory isn't page-aligned.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/mlock.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/mlock.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/mlock.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=mlock&sektion=2
+/// [NetBSD]: https://man.netbsd.org/mlock.2
+/// [OpenBSD]: https://man.openbsd.org/mlock.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=mlock&section=2
+/// [illumos]: https://illumos.org/man/3C/mlock
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Page-Lock-Functions.html#index-mlock
+#[inline]
+pub unsafe fn mlock(ptr: *mut c_void, len: usize) -> io::Result<()> {
+    backend::mm::syscalls::mlock(ptr, len)
+}
+
+/// `mlock2(ptr, len, flags)`—Lock memory into RAM, with flags.
+///
+/// `mlock_with` is the same as [`mlock`] but adds an additional flags operand.
+///
+/// # Safety
+///
+/// This function operates on raw pointers, but it should only be used on
+/// memory which the caller owns. Technically, locking memory shouldn't violate
+/// any invariants, but since unlocking it can violate invariants, this
+/// function is also unsafe for symmetry.
+///
+/// Some implementations implicitly round the memory region out to the nearest
+/// page boundaries, so this function may lock more memory than explicitly
+/// requested if the memory isn't page-aligned.
+///
+/// # References
+///  - [Linux]
+///  - [glibc]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/mlock2.2.html
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Page-Lock-Functions.html#index-mlock2
+#[cfg(linux_kernel)]
+#[inline]
+#[doc(alias = "mlock2")]
+pub unsafe fn mlock_with(ptr: *mut c_void, len: usize, flags: MlockFlags) -> io::Result<()> {
+    backend::mm::syscalls::mlock_with(ptr, len, flags)
+}
+
+/// `munlock(ptr, len)`—Unlock memory.
+///
+/// # Safety
+///
+/// This function operates on raw pointers, but it should only be used on
+/// memory which the caller owns, to avoid compromising the `mlock` invariants
+/// of other unrelated code in the process.
+///
+/// Some implementations implicitly round the memory region out to the nearest
+/// page boundaries, so this function may unlock more memory than explicitly
+/// requested if the memory isn't page-aligned.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/munlock.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/munlock.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/munlock.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=munlock&sektion=2
+/// [NetBSD]: https://man.netbsd.org/munlock.2
+/// [OpenBSD]: https://man.openbsd.org/munlock.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=munlock&section=2
+/// [illumos]: https://illumos.org/man/3C/munlock
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Page-Lock-Functions.html#index-munlock
+#[inline]
+pub unsafe fn munlock(ptr: *mut c_void, len: usize) -> io::Result<()> {
+    backend::mm::syscalls::munlock(ptr, len)
+}
+
+/// Locks all pages mapped into the address space of the calling process.
+///
+/// This includes the pages of the code, data, and stack segment, as well as
+/// shared libraries, user space kernel data, shared memory, and memory-mapped
+/// files. All mapped pages are guaranteed to be resident in RAM when the call
+/// returns successfully; the pages are guaranteed to stay in RAM until later
+/// unlocked.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/mlockall.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/mlockall.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=mlockall&sektion=2
+/// [NetBSD]: https://man.netbsd.org/mlockall.2
+/// [OpenBSD]: https://man.openbsd.org/mlockall.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=mlockall&section=2
+/// [illumos]: https://illumos.org/man/3C/mlockall
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Page-Lock-Functions.html#index-mlockall
+#[cfg(any(linux_kernel, freebsdlike, netbsdlike))]
+#[inline]
+pub fn mlockall(flags: MlockAllFlags) -> io::Result<()> {
+    backend::mm::syscalls::mlockall(flags)
+}
+
+/// Unlocks all pages mapped into the address space of the calling process.
+///
+/// # Warnings
+///
+/// This function is aware of all the memory pages in the process, as if it
+/// were a debugger. It unlocks all the pages, which could potentially
+/// compromise security assumptions made by code about memory it has
+/// encapsulated.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/munlockall.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/munlockall.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=munlockall&sektion=2
+/// [NetBSD]: https://man.netbsd.org/munlockall.2
+/// [OpenBSD]: https://man.openbsd.org/munlockall.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=munlockall&section=2
+/// [illumos]: https://illumos.org/man/3C/munlockall
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Page-Lock-Functions.html#index-munlockall
+#[cfg(any(linux_kernel, freebsdlike, netbsdlike))]
+#[inline]
+pub fn munlockall() -> io::Result<()> {
+    backend::mm::syscalls::munlockall()
+}
diff --git a/vendor/rustix/src/mm/mod.rs b/vendor/rustix/src/mm/mod.rs
new file mode 100644
index 0000000..7505cac
--- /dev/null
+++ b/vendor/rustix/src/mm/mod.rs
@@ -0,0 +1,15 @@
+//! Memory map operations.
+
+#[cfg(not(target_os = "redox"))]
+mod madvise;
+mod mmap;
+mod msync;
+#[cfg(linux_kernel)]
+mod userfaultfd;
+
+#[cfg(not(target_os = "redox"))]
+pub use madvise::{madvise, Advice};
+pub use mmap::*;
+pub use msync::{msync, MsyncFlags};
+#[cfg(linux_kernel)]
+pub use userfaultfd::{userfaultfd, UserfaultfdFlags};
diff --git a/vendor/rustix/src/mm/msync.rs b/vendor/rustix/src/mm/msync.rs
new file mode 100644
index 0000000..c61d7c3
--- /dev/null
+++ b/vendor/rustix/src/mm/msync.rs
@@ -0,0 +1,46 @@
+//! The `msync` function.
+//!
+//! # Safety
+//!
+//! `msync` operates on a raw pointer. Some forms of `msync` may mutate the
+//! memory or have other side effects.
+#![allow(unsafe_code)]
+
+use crate::{backend, io};
+use core::ffi::c_void;
+
+pub use backend::mm::types::MsyncFlags;
+
+/// `msync(addr, len, flags)`—Synchronizes a memory-mapping with its backing
+/// storage.
+///
+/// # Safety
+///
+/// `addr` must be a valid pointer to memory that is appropriate to call
+/// `msync` on. Some forms of `msync` may mutate the memory or evoke a variety
+/// of side-effects on the mapping and/or the file.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/msync.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/msync.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/msync.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=msync&sektion=2
+/// [NetBSD]: https://man.netbsd.org/msync.2
+/// [OpenBSD]: https://man.openbsd.org/msync.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=msync&section=2
+/// [illumos]: https://illumos.org/man/3C/msync
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Memory_002dmapped-I_002fO.html#index-msync
+#[inline]
+pub unsafe fn msync(addr: *mut c_void, len: usize, flags: MsyncFlags) -> io::Result<()> {
+    backend::mm::syscalls::msync(addr, len, flags)
+}
diff --git a/vendor/rustix/src/mm/userfaultfd.rs b/vendor/rustix/src/mm/userfaultfd.rs
new file mode 100644
index 0000000..201d547
--- /dev/null
+++ b/vendor/rustix/src/mm/userfaultfd.rs
@@ -0,0 +1,30 @@
+//! The Linux `userfaultfd` API.
+//!
+//! # Safety
+//!
+//! Calling `userfaultfd` is safe, but the returned file descriptor lets users
+//! observe and manipulate process memory in magical ways.
+#![allow(unsafe_code)]
+
+use crate::fd::OwnedFd;
+use crate::{backend, io};
+
+pub use backend::mm::types::UserfaultfdFlags;
+
+/// `userfaultfd(flags)`
+///
+/// # Safety
+///
+/// The call itself is safe, but the returned file descriptor lets users
+/// observe and manipulate process memory in magical ways.
+///
+/// # References
+///  - [Linux]
+///  - [Linux userfaultfd]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/userfaultfd.2.html
+/// [Linux userfaultfd]: https://www.kernel.org/doc/Documentation/vm/userfaultfd.txt
+#[inline]
+pub unsafe fn userfaultfd(flags: UserfaultfdFlags) -> io::Result<OwnedFd> {
+    backend::mm::syscalls::userfaultfd(flags)
+}
diff --git a/vendor/rustix/src/mount/fsopen.rs b/vendor/rustix/src/mount/fsopen.rs
new file mode 100644
index 0000000..54ba401
--- /dev/null
+++ b/vendor/rustix/src/mount/fsopen.rs
@@ -0,0 +1,219 @@
+//! `fsopen` and related functions in Linux's `mount` API.
+
+use crate::backend::mount::types::{
+    FsMountFlags, FsOpenFlags, FsPickFlags, MountAttrFlags, MoveMountFlags, OpenTreeFlags,
+};
+use crate::fd::{BorrowedFd, OwnedFd};
+use crate::{backend, io, path};
+
+/// `fsopen(fs_name, flags)`
+///
+/// # References
+///  - [Unfinished draft]
+///
+/// [Unfinished draft]: https://github.com/sunfishcode/linux-mount-api-documentation/blob/main/fsopen.md
+#[inline]
+pub fn fsopen<Fs: path::Arg>(fs_name: Fs, flags: FsOpenFlags) -> io::Result<OwnedFd> {
+    fs_name.into_with_c_str(|fs_name| backend::mount::syscalls::fsopen(fs_name, flags))
+}
+
+/// `fsmount(fs_fd, flags, attr_flags)`
+///
+/// # References
+///  - [Unfinished draft]
+///
+/// [Unfinished draft]: https://github.com/sunfishcode/linux-mount-api-documentation/blob/main/fsmount.md
+#[inline]
+pub fn fsmount(
+    fs_fd: BorrowedFd<'_>,
+    flags: FsMountFlags,
+    attr_flags: MountAttrFlags,
+) -> io::Result<OwnedFd> {
+    backend::mount::syscalls::fsmount(fs_fd, flags, attr_flags)
+}
+
+/// `move_mount(from_dfd, from_pathname, to_dfd, to_pathname, flags)`
+///
+/// This is not the same as `mount` with the `MS_MOVE` flag. If you want to
+/// use that, use [`mount_move`] instead.
+///
+/// # References
+///  - [Unfinished draft]
+///
+/// [`mount_move`]: crate::mount::mount_move
+/// [Unfinished draft]: https://github.com/sunfishcode/linux-mount-api-documentation/blob/main/move_mount.md
+#[inline]
+pub fn move_mount<From: path::Arg, To: path::Arg>(
+    from_dfd: BorrowedFd<'_>,
+    from_pathname: From,
+    to_dfd: BorrowedFd<'_>,
+    to_pathname: To,
+    flags: MoveMountFlags,
+) -> io::Result<()> {
+    from_pathname.into_with_c_str(|from_pathname| {
+        to_pathname.into_with_c_str(|to_pathname| {
+            backend::mount::syscalls::move_mount(
+                from_dfd,
+                from_pathname,
+                to_dfd,
+                to_pathname,
+                flags,
+            )
+        })
+    })
+}
+
+/// `open_tree(dfd, filename, flags)`
+///
+/// # References
+///  - [Unfinished draft]
+///
+/// [Unfinished draft]: https://github.com/sunfishcode/linux-mount-api-documentation/blob/main/open_tree.md
+#[inline]
+pub fn open_tree<Path: path::Arg>(
+    dfd: BorrowedFd<'_>,
+    filename: Path,
+    flags: OpenTreeFlags,
+) -> io::Result<OwnedFd> {
+    filename.into_with_c_str(|filename| backend::mount::syscalls::open_tree(dfd, filename, flags))
+}
+
+/// `fspick(dfd, path, flags)`
+///
+/// # References
+///  - [Unfinished draft]
+///
+/// [Unfinished draft]: https://github.com/sunfishcode/linux-mount-api-documentation/blob/main/fspick.md
+#[inline]
+pub fn fspick<Path: path::Arg>(
+    dfd: BorrowedFd<'_>,
+    path: Path,
+    flags: FsPickFlags,
+) -> io::Result<OwnedFd> {
+    path.into_with_c_str(|path| backend::mount::syscalls::fspick(dfd, path, flags))
+}
+
+/// `fsconfig(fs_fd, FSCONFIG_SET_FLAG, key, NULL, 0)`
+///
+/// # References
+///  - [Unfinished draft]
+///
+/// [Unfinished draft]: https://github.com/sunfishcode/linux-mount-api-documentation/blob/main/fsconfig.md
+#[inline]
+#[doc(alias = "fsconfig")]
+pub fn fsconfig_set_flag<Key: path::Arg>(fs_fd: BorrowedFd<'_>, key: Key) -> io::Result<()> {
+    key.into_with_c_str(|key| backend::mount::syscalls::fsconfig_set_flag(fs_fd, key))
+}
+
+/// `fsconfig(fs_fd, FSCONFIG_SET_STRING, key, value, 0)`
+///
+/// # References
+///  - [Unfinished draft]
+///
+/// [Unfinished draft]: https://github.com/sunfishcode/linux-mount-api-documentation/blob/main/fsconfig.md
+#[inline]
+#[doc(alias = "fsconfig")]
+pub fn fsconfig_set_string<Key: path::Arg, Value: path::Arg>(
+    fs_fd: BorrowedFd<'_>,
+    key: Key,
+    value: Value,
+) -> io::Result<()> {
+    key.into_with_c_str(|key| {
+        value.into_with_c_str(|value| {
+            backend::mount::syscalls::fsconfig_set_string(fs_fd, key, value)
+        })
+    })
+}
+
+/// `fsconfig(fs_fd, FSCONFIG_SET_BINARY, key, value, value.len())`
+///
+/// # References
+///  - [Unfinished draft]
+///
+/// [Unfinished draft]: https://github.com/sunfishcode/linux-mount-api-documentation/blob/main/fsconfig.md
+#[inline]
+#[doc(alias = "fsconfig")]
+pub fn fsconfig_set_binary<Key: path::Arg>(
+    fs_fd: BorrowedFd<'_>,
+    key: Key,
+    value: &[u8],
+) -> io::Result<()> {
+    key.into_with_c_str(|key| backend::mount::syscalls::fsconfig_set_binary(fs_fd, key, value))
+}
+
+/// `fsconfig(fs_fd, FSCONFIG_SET_PATH, key, path, fd)`
+///
+/// # References
+///  - [Unfinished draft]
+///
+/// [Unfinished draft]: https://github.com/sunfishcode/linux-mount-api-documentation/blob/main/fsconfig.md
+#[inline]
+#[doc(alias = "fsconfig")]
+pub fn fsconfig_set_path<Key: path::Arg, Path: path::Arg>(
+    fs_fd: BorrowedFd<'_>,
+    key: Key,
+    path: Path,
+    fd: BorrowedFd<'_>,
+) -> io::Result<()> {
+    key.into_with_c_str(|key| {
+        path.into_with_c_str(|path| {
+            backend::mount::syscalls::fsconfig_set_path(fs_fd, key, path, fd)
+        })
+    })
+}
+
+/// `fsconfig(fs_fd, FSCONFIG_SET_PATH_EMPTY, key, "", fd)`
+///
+/// # References
+///  - [Unfinished draft]
+///
+/// [Unfinished draft]: https://github.com/sunfishcode/linux-mount-api-documentation/blob/main/fsconfig.md
+#[inline]
+#[doc(alias = "fsconfig")]
+pub fn fsconfig_set_path_empty<Key: path::Arg>(
+    fs_fd: BorrowedFd<'_>,
+    key: Key,
+    fd: BorrowedFd<'_>,
+) -> io::Result<()> {
+    key.into_with_c_str(|key| backend::mount::syscalls::fsconfig_set_path_empty(fs_fd, key, fd))
+}
+
+/// `fsconfig(fs_fd, FSCONFIG_SET_FD, key, NULL, fd)`
+///
+/// # References
+///  - [Unfinished draft]
+///
+/// [Unfinished draft]: https://github.com/sunfishcode/linux-mount-api-documentation/blob/main/fsconfig.md
+#[inline]
+#[doc(alias = "fsconfig")]
+pub fn fsconfig_set_fd<Key: path::Arg>(
+    fs_fd: BorrowedFd<'_>,
+    key: Key,
+    fd: BorrowedFd<'_>,
+) -> io::Result<()> {
+    key.into_with_c_str(|key| backend::mount::syscalls::fsconfig_set_fd(fs_fd, key, fd))
+}
+
+/// `fsconfig(fs_fd, FSCONFIG_CMD_CREATE, key, NULL, 0)`
+///
+/// # References
+///  - [Unfinished draft]
+///
+/// [Unfinished draft]: https://github.com/sunfishcode/linux-mount-api-documentation/blob/main/fsconfig.md
+#[inline]
+#[doc(alias = "fsconfig")]
+pub fn fsconfig_create(fs_fd: BorrowedFd<'_>) -> io::Result<()> {
+    backend::mount::syscalls::fsconfig_create(fs_fd)
+}
+
+/// `fsconfig(fs_fd, FSCONFIG_CMD_RECONFIGURE, key, NULL, 0)`
+///
+/// # References
+///  - [Unfinished draft]
+///
+/// [Unfinished draft]: https://github.com/sunfishcode/linux-mount-api-documentation/blob/main/fsconfig.md
+#[inline]
+#[doc(alias = "fsconfig")]
+pub fn fsconfig_reconfigure(fs_fd: BorrowedFd<'_>) -> io::Result<()> {
+    backend::mount::syscalls::fsconfig_reconfigure(fs_fd)
+}
diff --git a/vendor/rustix/src/mount/mod.rs b/vendor/rustix/src/mount/mod.rs
new file mode 100644
index 0000000..9b4f6da
--- /dev/null
+++ b/vendor/rustix/src/mount/mod.rs
@@ -0,0 +1,19 @@
+//! Linux `mount` API.
+
+// The `mount` module includes the `mount` function and related
+// functions which were originally defined in `rustix::fs` but are
+// now replaced by deprecated aliases. After the next semver bump,
+// we can remove the aliases and all the `#[cfg(feature = "mount")]`
+// here and in src/backend/*/mount.
+//
+// The `fsopen` module includes `fsopen` and related functions.
+
+#[cfg(feature = "mount")]
+mod fsopen;
+mod mount_unmount;
+mod types;
+
+#[cfg(feature = "mount")]
+pub use fsopen::*;
+pub use mount_unmount::*;
+pub use types::*;
diff --git a/vendor/rustix/src/mount/mount_unmount.rs b/vendor/rustix/src/mount/mount_unmount.rs
new file mode 100644
index 0000000..ebb5173
--- /dev/null
+++ b/vendor/rustix/src/mount/mount_unmount.rs
@@ -0,0 +1,175 @@
+//! Linux `mount`.
+
+use crate::backend::mount::types::{
+    InternalMountFlags, MountFlags, MountFlagsArg, MountPropagationFlags, UnmountFlags,
+};
+use crate::{backend, io, path};
+
+/// `mount(source, target, filesystemtype, mountflags, data)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/mount.2.html
+#[inline]
+pub fn mount<Source: path::Arg, Target: path::Arg, Fs: path::Arg, Data: path::Arg>(
+    source: Source,
+    target: Target,
+    file_system_type: Fs,
+    flags: MountFlags,
+    data: Data,
+) -> io::Result<()> {
+    source.into_with_c_str(|source| {
+        target.into_with_c_str(|target| {
+            file_system_type.into_with_c_str(|file_system_type| {
+                data.into_with_c_str(|data| {
+                    backend::mount::syscalls::mount(
+                        Some(source),
+                        target,
+                        Some(file_system_type),
+                        MountFlagsArg(flags.bits()),
+                        Some(data),
+                    )
+                })
+            })
+        })
+    })
+}
+
+/// `mount(NULL, target, NULL, MS_REMOUNT | mountflags, data)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/mount.2.html
+#[inline]
+#[doc(alias = "mount")]
+#[doc(alias = "MS_REMOUNT")]
+pub fn mount_remount<Target: path::Arg, Data: path::Arg>(
+    target: Target,
+    flags: MountFlags,
+    data: Data,
+) -> io::Result<()> {
+    target.into_with_c_str(|target| {
+        data.into_with_c_str(|data| {
+            backend::mount::syscalls::mount(
+                None,
+                target,
+                None,
+                MountFlagsArg(InternalMountFlags::REMOUNT.bits() | flags.bits()),
+                Some(data),
+            )
+        })
+    })
+}
+
+/// `mount(source, target, NULL, MS_BIND, NULL)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/mount.2.html
+#[inline]
+#[doc(alias = "mount")]
+#[doc(alias = "MS_BIND")]
+pub fn mount_bind<Source: path::Arg, Target: path::Arg>(
+    source: Source,
+    target: Target,
+) -> io::Result<()> {
+    source.into_with_c_str(|source| {
+        target.into_with_c_str(|target| {
+            backend::mount::syscalls::mount(
+                Some(source),
+                target,
+                None,
+                MountFlagsArg(MountFlags::BIND.bits()),
+                None,
+            )
+        })
+    })
+}
+
+/// `mount(source, target, NULL, MS_BIND | MS_REC, NULL)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/mount.2.html
+#[inline]
+#[doc(alias = "mount")]
+#[doc(alias = "MS_REC")]
+pub fn mount_recursive_bind<Source: path::Arg, Target: path::Arg>(
+    source: Source,
+    target: Target,
+) -> io::Result<()> {
+    source.into_with_c_str(|source| {
+        target.into_with_c_str(|target| {
+            backend::mount::syscalls::mount(
+                Some(source),
+                target,
+                None,
+                MountFlagsArg(MountFlags::BIND.bits() | MountPropagationFlags::REC.bits()),
+                None,
+            )
+        })
+    })
+}
+
+/// `mount(NULL, target, NULL, mountflags, NULL)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/mount.2.html
+#[inline]
+#[doc(alias = "mount")]
+pub fn mount_change<Target: path::Arg>(
+    target: Target,
+    flags: MountPropagationFlags,
+) -> io::Result<()> {
+    target.into_with_c_str(|target| {
+        backend::mount::syscalls::mount(None, target, None, MountFlagsArg(flags.bits()), None)
+    })
+}
+
+/// `mount(source, target, NULL, MS_MOVE, NULL)`
+///
+/// This is not the same as the `move_mount` syscall. If you want to use that,
+/// use [`move_mount`] instead.
+///
+/// # References
+///  - [Linux]
+///
+/// [`move_mount`]: crate::mount::move_mount
+/// [Linux]: https://man7.org/linux/man-pages/man2/mount.2.html
+#[inline]
+#[doc(alias = "mount")]
+#[doc(alias = "MS_MOVE")]
+pub fn mount_move<Source: path::Arg, Target: path::Arg>(
+    source: Source,
+    target: Target,
+) -> io::Result<()> {
+    source.into_with_c_str(|source| {
+        target.into_with_c_str(|target| {
+            backend::mount::syscalls::mount(
+                Some(source),
+                target,
+                None,
+                MountFlagsArg(InternalMountFlags::MOVE.bits()),
+                None,
+            )
+        })
+    })
+}
+
+/// `umount2(target, flags)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/umount.2.html
+#[inline]
+#[doc(alias = "umount", alias = "umount2")]
+pub fn unmount<Target: path::Arg>(target: Target, flags: UnmountFlags) -> io::Result<()> {
+    target.into_with_c_str(|target| backend::mount::syscalls::unmount(target, flags))
+}
diff --git a/vendor/rustix/src/mount/types.rs b/vendor/rustix/src/mount/types.rs
new file mode 100644
index 0000000..6096e76
--- /dev/null
+++ b/vendor/rustix/src/mount/types.rs
@@ -0,0 +1 @@
+pub use crate::backend::mount::types::*;
diff --git a/vendor/rustix/src/net/mod.rs b/vendor/rustix/src/net/mod.rs
new file mode 100644
index 0000000..73ae2f0
--- /dev/null
+++ b/vendor/rustix/src/net/mod.rs
@@ -0,0 +1,31 @@
+//! Network-related operations.
+//!
+//! On Windows, one must call [`wsa_startup`] in the process before calling any
+//! of these APIs. [`wsa_cleanup`] may be used in the process if these APIs are
+//! no longer needed.
+//!
+//! [`wsa_startup`]: https://docs.rs/rustix/*/x86_64-pc-windows-msvc/rustix/net/fn.wsa_startup.html
+//! [`wsa_cleanup`]: https://docs.rs/rustix/*/x86_64-pc-windows-msvc/rustix/net/fn.wsa_cleanup.html
+
+mod send_recv;
+mod socket;
+mod socket_addr_any;
+#[cfg(not(any(windows, target_os = "wasi")))]
+mod socketpair;
+mod types;
+#[cfg(windows)]
+mod wsa;
+
+pub mod sockopt;
+
+pub use crate::maybe_polyfill::net::{
+    IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6,
+};
+pub use send_recv::*;
+pub use socket::*;
+pub use socket_addr_any::{SocketAddrAny, SocketAddrStorage};
+#[cfg(not(any(windows, target_os = "wasi")))]
+pub use socketpair::socketpair;
+pub use types::*;
+#[cfg(windows)]
+pub use wsa::{wsa_cleanup, wsa_startup};
diff --git a/vendor/rustix/src/net/send_recv/mod.rs b/vendor/rustix/src/net/send_recv/mod.rs
new file mode 100644
index 0000000..cad2d5c
--- /dev/null
+++ b/vendor/rustix/src/net/send_recv/mod.rs
@@ -0,0 +1,380 @@
+//! `recv`, `send`, and variants.
+
+#![allow(unsafe_code)]
+
+use crate::buffer::split_init;
+#[cfg(unix)]
+use crate::net::SocketAddrUnix;
+use crate::net::{SocketAddr, SocketAddrAny, SocketAddrV4, SocketAddrV6};
+use crate::{backend, io};
+use backend::fd::{AsFd, BorrowedFd};
+use core::mem::MaybeUninit;
+
+pub use backend::net::send_recv::{RecvFlags, SendFlags};
+
+#[cfg(not(any(
+    windows,
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+mod msg;
+
+#[cfg(not(any(
+    windows,
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+pub use msg::*;
+
+/// `recv(fd, buf, flags)`—Reads data from a socket.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#sendrecv
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/recv.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/recv.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/recv.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-recv
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=recv&sektion=2
+/// [NetBSD]: https://man.netbsd.org/recv.2
+/// [OpenBSD]: https://man.openbsd.org/recv.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=recv&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/recv
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Receiving-Data.html
+#[inline]
+pub fn recv<Fd: AsFd>(fd: Fd, buf: &mut [u8], flags: RecvFlags) -> io::Result<usize> {
+    unsafe { backend::net::syscalls::recv(fd.as_fd(), buf.as_mut_ptr(), buf.len(), flags) }
+}
+
+/// `recv(fd, buf, flags)`—Reads data from a socket.
+///
+/// This is equivalent to [`recv`], except that it can read into uninitialized
+/// memory. It returns the slice that was initialized by this function and the
+/// slice that remains uninitialized.
+#[inline]
+pub fn recv_uninit<Fd: AsFd>(
+    fd: Fd,
+    buf: &mut [MaybeUninit<u8>],
+    flags: RecvFlags,
+) -> io::Result<(&mut [u8], &mut [MaybeUninit<u8>])> {
+    let length = unsafe {
+        backend::net::syscalls::recv(fd.as_fd(), buf.as_mut_ptr() as *mut u8, buf.len(), flags)
+    };
+
+    Ok(unsafe { split_init(buf, length?) })
+}
+
+/// `send(fd, buf, flags)`—Writes data to a socket.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#sendrecv
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/send.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/send.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/send.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-send
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=send&sektion=2
+/// [NetBSD]: https://man.netbsd.org/send.2
+/// [OpenBSD]: https://man.openbsd.org/send.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=send&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/send
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Sending-Data.html
+#[inline]
+pub fn send<Fd: AsFd>(fd: Fd, buf: &[u8], flags: SendFlags) -> io::Result<usize> {
+    backend::net::syscalls::send(fd.as_fd(), buf, flags)
+}
+
+/// `recvfrom(fd, buf, flags, addr, len)`—Reads data from a socket and
+/// returns the sender address.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#sendtorecv
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/recvfrom.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/recvfrom.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/recvfrom.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-recvfrom
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=recvfrom&sektion=2
+/// [NetBSD]: https://man.netbsd.org/recvfrom.2
+/// [OpenBSD]: https://man.openbsd.org/recvfrom.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=recvfrom&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/recvfrom
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Receiving-Datagrams.html
+#[inline]
+pub fn recvfrom<Fd: AsFd>(
+    fd: Fd,
+    buf: &mut [u8],
+    flags: RecvFlags,
+) -> io::Result<(usize, Option<SocketAddrAny>)> {
+    unsafe { backend::net::syscalls::recvfrom(fd.as_fd(), buf.as_mut_ptr(), buf.len(), flags) }
+}
+
+/// `recvfrom(fd, buf, flags, addr, len)`—Reads data from a socket and
+/// returns the sender address.
+///
+/// This is equivalent to [`recvfrom`], except that it can read into
+/// uninitialized memory. It returns the slice that was initialized by this
+/// function and the slice that remains uninitialized.
+#[allow(clippy::type_complexity)]
+#[inline]
+pub fn recvfrom_uninit<Fd: AsFd>(
+    fd: Fd,
+    buf: &mut [MaybeUninit<u8>],
+    flags: RecvFlags,
+) -> io::Result<(&mut [u8], &mut [MaybeUninit<u8>], Option<SocketAddrAny>)> {
+    let (length, addr) = unsafe {
+        backend::net::syscalls::recvfrom(fd.as_fd(), buf.as_mut_ptr() as *mut u8, buf.len(), flags)?
+    };
+    let (init, uninit) = unsafe { split_init(buf, length) };
+    Ok((init, uninit, addr))
+}
+
+/// `sendto(fd, buf, flags, addr)`—Writes data to a socket to a specific IP
+/// address.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#sendtorecv
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sendto.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/sendto.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/sendto.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-sendto
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=sendto&sektion=2
+/// [NetBSD]: https://man.netbsd.org/sendto.2
+/// [OpenBSD]: https://man.openbsd.org/sendto.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=sendto&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/sendto
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Sending-Datagrams.html
+pub fn sendto<Fd: AsFd>(
+    fd: Fd,
+    buf: &[u8],
+    flags: SendFlags,
+    addr: &SocketAddr,
+) -> io::Result<usize> {
+    _sendto(fd.as_fd(), buf, flags, addr)
+}
+
+fn _sendto(
+    fd: BorrowedFd<'_>,
+    buf: &[u8],
+    flags: SendFlags,
+    addr: &SocketAddr,
+) -> io::Result<usize> {
+    match addr {
+        SocketAddr::V4(v4) => backend::net::syscalls::sendto_v4(fd, buf, flags, v4),
+        SocketAddr::V6(v6) => backend::net::syscalls::sendto_v6(fd, buf, flags, v6),
+    }
+}
+
+/// `sendto(fd, buf, flags, addr)`—Writes data to a socket to a specific
+/// address.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#sendtorecv
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sendto.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/sendto.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/sendto.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-sendto
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=sendto&sektion=2
+/// [NetBSD]: https://man.netbsd.org/sendto.2
+/// [OpenBSD]: https://man.openbsd.org/sendto.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=sendto&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/sendto
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Sending-Datagrams.html
+pub fn sendto_any<Fd: AsFd>(
+    fd: Fd,
+    buf: &[u8],
+    flags: SendFlags,
+    addr: &SocketAddrAny,
+) -> io::Result<usize> {
+    _sendto_any(fd.as_fd(), buf, flags, addr)
+}
+
+fn _sendto_any(
+    fd: BorrowedFd<'_>,
+    buf: &[u8],
+    flags: SendFlags,
+    addr: &SocketAddrAny,
+) -> io::Result<usize> {
+    match addr {
+        SocketAddrAny::V4(v4) => backend::net::syscalls::sendto_v4(fd, buf, flags, v4),
+        SocketAddrAny::V6(v6) => backend::net::syscalls::sendto_v6(fd, buf, flags, v6),
+        #[cfg(unix)]
+        SocketAddrAny::Unix(unix) => backend::net::syscalls::sendto_unix(fd, buf, flags, unix),
+    }
+}
+
+/// `sendto(fd, buf, flags, addr, sizeof(struct sockaddr_in))`—Writes data to
+/// a socket to a specific IPv4 address.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#sendtorecv
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sendto.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/sendto.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/sendto.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-sendto
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=sendto&sektion=2
+/// [NetBSD]: https://man.netbsd.org/sendto.2
+/// [OpenBSD]: https://man.openbsd.org/sendto.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=sendto&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/sendto
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Sending-Datagrams.html
+#[inline]
+#[doc(alias = "sendto")]
+pub fn sendto_v4<Fd: AsFd>(
+    fd: Fd,
+    buf: &[u8],
+    flags: SendFlags,
+    addr: &SocketAddrV4,
+) -> io::Result<usize> {
+    backend::net::syscalls::sendto_v4(fd.as_fd(), buf, flags, addr)
+}
+
+/// `sendto(fd, buf, flags, addr, sizeof(struct sockaddr_in6))`—Writes data
+/// to a socket to a specific IPv6 address.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#sendtorecv
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sendto.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/sendto.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/sendto.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-sendto
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=sendto&sektion=2
+/// [NetBSD]: https://man.netbsd.org/sendto.2
+/// [OpenBSD]: https://man.openbsd.org/sendto.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=sendto&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/sendto
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Sending-Datagrams.html
+#[inline]
+#[doc(alias = "sendto")]
+pub fn sendto_v6<Fd: AsFd>(
+    fd: Fd,
+    buf: &[u8],
+    flags: SendFlags,
+    addr: &SocketAddrV6,
+) -> io::Result<usize> {
+    backend::net::syscalls::sendto_v6(fd.as_fd(), buf, flags, addr)
+}
+
+/// `sendto(fd, buf, flags, addr, sizeof(struct sockaddr_un))`—Writes data to
+/// a socket to a specific Unix-domain socket address.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#sendtorecv
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sendto.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/sendto.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/sendto.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-sendto
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=sendto&sektion=2
+/// [NetBSD]: https://man.netbsd.org/sendto.2
+/// [OpenBSD]: https://man.openbsd.org/sendto.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=sendto&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/sendto
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Sending-Datagrams.html
+#[cfg(unix)]
+#[inline]
+#[doc(alias = "sendto")]
+pub fn sendto_unix<Fd: AsFd>(
+    fd: Fd,
+    buf: &[u8],
+    flags: SendFlags,
+    addr: &SocketAddrUnix,
+) -> io::Result<usize> {
+    backend::net::syscalls::sendto_unix(fd.as_fd(), buf, flags, addr)
+}
diff --git a/vendor/rustix/src/net/send_recv/msg.rs b/vendor/rustix/src/net/send_recv/msg.rs
new file mode 100644
index 0000000..78fb865
--- /dev/null
+++ b/vendor/rustix/src/net/send_recv/msg.rs
@@ -0,0 +1,966 @@
+//! [`recvmsg`], [`sendmsg`], and related functions.
+
+#![allow(unsafe_code)]
+
+use crate::backend::{self, c};
+use crate::fd::{AsFd, BorrowedFd, OwnedFd};
+use crate::io::{self, IoSlice, IoSliceMut};
+#[cfg(linux_kernel)]
+use crate::net::UCred;
+
+use core::iter::FusedIterator;
+use core::marker::PhantomData;
+use core::mem::{align_of, size_of, size_of_val, take};
+#[cfg(linux_kernel)]
+use core::ptr::addr_of;
+use core::{ptr, slice};
+
+use super::{RecvFlags, SendFlags, SocketAddrAny, SocketAddrV4, SocketAddrV6};
+
+/// Macro for defining the amount of space to allocate in a buffer for use with
+/// [`RecvAncillaryBuffer::new`] and [`SendAncillaryBuffer::new`].
+///
+/// # Examples
+///
+/// Allocate a buffer for a single file descriptor:
+/// ```
+/// # use rustix::cmsg_space;
+/// let mut space = [0; rustix::cmsg_space!(ScmRights(1))];
+/// ```
+///
+/// Allocate a buffer for credentials:
+/// ```
+/// # #[cfg(linux_kernel)]
+/// # {
+/// # use rustix::cmsg_space;
+/// let mut space = [0; rustix::cmsg_space!(ScmCredentials(1))];
+/// # }
+/// ```
+///
+/// Allocate a buffer for two file descriptors and credentials:
+/// ```
+/// # #[cfg(linux_kernel)]
+/// # {
+/// # use rustix::cmsg_space;
+/// let mut space = [0; rustix::cmsg_space!(ScmRights(2), ScmCredentials(1))];
+/// # }
+/// ```
+#[macro_export]
+macro_rules! cmsg_space {
+    // Base Rules
+    (ScmRights($len:expr)) => {
+        $crate::net::__cmsg_space(
+            $len * ::core::mem::size_of::<$crate::fd::BorrowedFd<'static>>(),
+        )
+    };
+    (ScmCredentials($len:expr)) => {
+        $crate::net::__cmsg_space(
+            $len * ::core::mem::size_of::<$crate::net::UCred>(),
+        )
+    };
+
+    // Combo Rules
+    ($firstid:ident($firstex:expr), $($restid:ident($restex:expr)),*) => {{
+        // We only have to add `cmsghdr` alignment once; all other times we can
+        // use `cmsg_aligned_space`.
+        let sum = $crate::cmsg_space!($firstid($firstex));
+        $(
+            let sum = sum + $crate::cmsg_aligned_space!($restid($restex));
+        )*
+        sum
+    }};
+}
+
+/// Like `cmsg_space`, but doesn't add padding for `cmsghdr` alignment.
+#[doc(hidden)]
+#[macro_export]
+macro_rules! cmsg_aligned_space {
+    // Base Rules
+    (ScmRights($len:expr)) => {
+        $crate::net::__cmsg_aligned_space(
+            $len * ::core::mem::size_of::<$crate::fd::BorrowedFd<'static>>(),
+        )
+    };
+    (ScmCredentials($len:expr)) => {
+        $crate::net::__cmsg_aligned_space(
+            $len * ::core::mem::size_of::<$crate::net::UCred>(),
+        )
+    };
+
+    // Combo Rules
+    ($firstid:ident($firstex:expr), $($restid:ident($restex:expr)),*) => {{
+        let sum = cmsg_aligned_space!($firstid($firstex));
+        $(
+            let sum = sum + cmsg_aligned_space!($restid($restex));
+        )*
+        sum
+    }};
+}
+
+#[doc(hidden)]
+pub const fn __cmsg_space(len: usize) -> usize {
+    // Add `align_of::<c::cmsghdr>()` so that we can align the user-provided
+    // `&[u8]` to the required alignment boundary.
+    let len = len + align_of::<c::cmsghdr>();
+
+    __cmsg_aligned_space(len)
+}
+
+#[doc(hidden)]
+pub const fn __cmsg_aligned_space(len: usize) -> usize {
+    // Convert `len` to `u32` for `CMSG_SPACE`. This would be `try_into()` if
+    // we could call that in a `const fn`.
+    let converted_len = len as u32;
+    if converted_len as usize != len {
+        unreachable!(); // `CMSG_SPACE` size overflow
+    }
+
+    unsafe { c::CMSG_SPACE(converted_len) as usize }
+}
+
+/// Ancillary message for [`sendmsg`], [`sendmsg_v4`], [`sendmsg_v6`],
+/// [`sendmsg_unix`], and [`sendmsg_any`].
+#[non_exhaustive]
+pub enum SendAncillaryMessage<'slice, 'fd> {
+    /// Send file descriptors.
+    #[doc(alias = "SCM_RIGHTS")]
+    ScmRights(&'slice [BorrowedFd<'fd>]),
+    /// Send process credentials.
+    #[cfg(linux_kernel)]
+    #[doc(alias = "SCM_CREDENTIAL")]
+    ScmCredentials(UCred),
+}
+
+impl SendAncillaryMessage<'_, '_> {
+    /// Get the maximum size of an ancillary message.
+    ///
+    /// This can be helpful in determining the size of the buffer you allocate.
+    pub const fn size(&self) -> usize {
+        match self {
+            Self::ScmRights(slice) => cmsg_space!(ScmRights(slice.len())),
+            #[cfg(linux_kernel)]
+            Self::ScmCredentials(_) => cmsg_space!(ScmCredentials(1)),
+        }
+    }
+}
+
+/// Ancillary message for [`recvmsg`].
+#[non_exhaustive]
+pub enum RecvAncillaryMessage<'a> {
+    /// Received file descriptors.
+    #[doc(alias = "SCM_RIGHTS")]
+    ScmRights(AncillaryIter<'a, OwnedFd>),
+    /// Received process credentials.
+    #[cfg(linux_kernel)]
+    #[doc(alias = "SCM_CREDENTIALS")]
+    ScmCredentials(UCred),
+}
+
+/// Buffer for sending ancillary messages with [`sendmsg`], [`sendmsg_v4`],
+/// [`sendmsg_v6`], [`sendmsg_unix`], and [`sendmsg_any`].
+///
+/// Use the [`push`] function to add messages to send.
+///
+/// [`push`]: SendAncillaryBuffer::push
+pub struct SendAncillaryBuffer<'buf, 'slice, 'fd> {
+    /// Raw byte buffer for messages.
+    buffer: &'buf mut [u8],
+
+    /// The amount of the buffer that is used.
+    length: usize,
+
+    /// Phantom data for lifetime of `&'slice [BorrowedFd<'fd>]`.
+    _phantom: PhantomData<&'slice [BorrowedFd<'fd>]>,
+}
+
+impl<'buf> From<&'buf mut [u8]> for SendAncillaryBuffer<'buf, '_, '_> {
+    fn from(buffer: &'buf mut [u8]) -> Self {
+        Self::new(buffer)
+    }
+}
+
+impl Default for SendAncillaryBuffer<'_, '_, '_> {
+    fn default() -> Self {
+        Self {
+            buffer: &mut [],
+            length: 0,
+            _phantom: PhantomData,
+        }
+    }
+}
+
+impl<'buf, 'slice, 'fd> SendAncillaryBuffer<'buf, 'slice, 'fd> {
+    /// Create a new, empty `SendAncillaryBuffer` from a raw byte buffer.
+    ///
+    /// The buffer size may be computed with [`cmsg_space`], or it may be
+    /// zero for an empty buffer, however in that case, consider `default()`
+    /// instead, or even using [`send`] instead of `sendmsg`.
+    ///
+    /// # Examples
+    ///
+    /// Allocate a buffer for a single file descriptor:
+    /// ```
+    /// # use rustix::cmsg_space;
+    /// # use rustix::net::SendAncillaryBuffer;
+    /// let mut space = [0; rustix::cmsg_space!(ScmRights(1))];
+    /// let mut cmsg_buffer = SendAncillaryBuffer::new(&mut space);
+    /// ```
+    ///
+    /// Allocate a buffer for credentials:
+    /// ```
+    /// # #[cfg(linux_kernel)]
+    /// # {
+    /// # use rustix::cmsg_space;
+    /// # use rustix::net::SendAncillaryBuffer;
+    /// let mut space = [0; rustix::cmsg_space!(ScmCredentials(1))];
+    /// let mut cmsg_buffer = SendAncillaryBuffer::new(&mut space);
+    /// # }
+    /// ```
+    ///
+    /// Allocate a buffer for two file descriptors and credentials:
+    /// ```
+    /// # #[cfg(linux_kernel)]
+    /// # {
+    /// # use rustix::cmsg_space;
+    /// # use rustix::net::SendAncillaryBuffer;
+    /// let mut space = [0; rustix::cmsg_space!(ScmRights(2), ScmCredentials(1))];
+    /// let mut cmsg_buffer = SendAncillaryBuffer::new(&mut space);
+    /// # }
+    /// ```
+    ///
+    /// [`send`]: crate::net::send
+    #[inline]
+    pub fn new(buffer: &'buf mut [u8]) -> Self {
+        Self {
+            buffer: align_for_cmsghdr(buffer),
+            length: 0,
+            _phantom: PhantomData,
+        }
+    }
+
+    /// Returns a pointer to the message data.
+    pub(crate) fn as_control_ptr(&mut self) -> *mut u8 {
+        // When the length is zero, we may be using a `&[]` address, which may
+        // be an invalid but non-null pointer, and on some platforms, that
+        // causes `sendmsg` to fail with `EFAULT` or `EINVAL`
+        #[cfg(not(linux_kernel))]
+        if self.length == 0 {
+            return core::ptr::null_mut();
+        }
+
+        self.buffer.as_mut_ptr()
+    }
+
+    /// Returns the length of the message data.
+    pub(crate) fn control_len(&self) -> usize {
+        self.length
+    }
+
+    /// Delete all messages from the buffer.
+    pub fn clear(&mut self) {
+        self.length = 0;
+    }
+
+    /// Add an ancillary message to the buffer.
+    ///
+    /// Returns `true` if the message was added successfully.
+    pub fn push(&mut self, msg: SendAncillaryMessage<'slice, 'fd>) -> bool {
+        match msg {
+            SendAncillaryMessage::ScmRights(fds) => {
+                let fds_bytes =
+                    unsafe { slice::from_raw_parts(fds.as_ptr().cast::<u8>(), size_of_val(fds)) };
+                self.push_ancillary(fds_bytes, c::SOL_SOCKET as _, c::SCM_RIGHTS as _)
+            }
+            #[cfg(linux_kernel)]
+            SendAncillaryMessage::ScmCredentials(ucred) => {
+                let ucred_bytes = unsafe {
+                    slice::from_raw_parts(addr_of!(ucred).cast::<u8>(), size_of_val(&ucred))
+                };
+                self.push_ancillary(ucred_bytes, c::SOL_SOCKET as _, c::SCM_CREDENTIALS as _)
+            }
+        }
+    }
+
+    /// Pushes an ancillary message to the buffer.
+    fn push_ancillary(&mut self, source: &[u8], cmsg_level: c::c_int, cmsg_type: c::c_int) -> bool {
+        macro_rules! leap {
+            ($e:expr) => {{
+                match ($e) {
+                    Some(x) => x,
+                    None => return false,
+                }
+            }};
+        }
+
+        // Calculate the length of the message.
+        let source_len = leap!(u32::try_from(source.len()).ok());
+
+        // Calculate the new length of the buffer.
+        let additional_space = unsafe { c::CMSG_SPACE(source_len) };
+        let new_length = leap!(self.length.checked_add(additional_space as usize));
+        let buffer = leap!(self.buffer.get_mut(..new_length));
+
+        // Fill the new part of the buffer with zeroes.
+        buffer[self.length..new_length].fill(0);
+        self.length = new_length;
+
+        // Get the last header in the buffer.
+        let last_header = leap!(messages::Messages::new(buffer).last());
+
+        // Set the header fields.
+        last_header.cmsg_len = unsafe { c::CMSG_LEN(source_len) } as _;
+        last_header.cmsg_level = cmsg_level;
+        last_header.cmsg_type = cmsg_type;
+
+        // Get the pointer to the payload and copy the data.
+        unsafe {
+            let payload = c::CMSG_DATA(last_header);
+            ptr::copy_nonoverlapping(source.as_ptr(), payload, source_len as _);
+        }
+
+        true
+    }
+}
+
+impl<'slice, 'fd> Extend<SendAncillaryMessage<'slice, 'fd>>
+    for SendAncillaryBuffer<'_, 'slice, 'fd>
+{
+    fn extend<T: IntoIterator<Item = SendAncillaryMessage<'slice, 'fd>>>(&mut self, iter: T) {
+        // TODO: This could be optimized to add every message in one go.
+        iter.into_iter().all(|msg| self.push(msg));
+    }
+}
+
+/// Buffer for receiving ancillary messages with [`recvmsg`].
+///
+/// Use the [`drain`] function to iterate over the received messages.
+///
+/// [`drain`]: RecvAncillaryBuffer::drain
+#[derive(Default)]
+pub struct RecvAncillaryBuffer<'buf> {
+    /// Raw byte buffer for messages.
+    buffer: &'buf mut [u8],
+
+    /// The portion of the buffer we've read from already.
+    read: usize,
+
+    /// The amount of the buffer that is used.
+    length: usize,
+}
+
+impl<'buf> From<&'buf mut [u8]> for RecvAncillaryBuffer<'buf> {
+    fn from(buffer: &'buf mut [u8]) -> Self {
+        Self::new(buffer)
+    }
+}
+
+impl<'buf> RecvAncillaryBuffer<'buf> {
+    /// Create a new, empty `RecvAncillaryBuffer` from a raw byte buffer.
+    ///
+    /// The buffer size may be computed with [`cmsg_space`], or it may be
+    /// zero for an empty buffer, however in that case, consider `default()`
+    /// instead, or even using [`recv`] instead of `recvmsg`.
+    ///
+    /// # Examples
+    ///
+    /// Allocate a buffer for a single file descriptor:
+    /// ```
+    /// # use rustix::cmsg_space;
+    /// # use rustix::net::RecvAncillaryBuffer;
+    /// let mut space = [0; rustix::cmsg_space!(ScmRights(1))];
+    /// let mut cmsg_buffer = RecvAncillaryBuffer::new(&mut space);
+    /// ```
+    ///
+    /// Allocate a buffer for credentials:
+    /// ```
+    /// # #[cfg(linux_kernel)]
+    /// # {
+    /// # use rustix::cmsg_space;
+    /// # use rustix::net::RecvAncillaryBuffer;
+    /// let mut space = [0; rustix::cmsg_space!(ScmCredentials(1))];
+    /// let mut cmsg_buffer = RecvAncillaryBuffer::new(&mut space);
+    /// # }
+    /// ```
+    ///
+    /// Allocate a buffer for two file descriptors and credentials:
+    /// ```
+    /// # #[cfg(linux_kernel)]
+    /// # {
+    /// # use rustix::cmsg_space;
+    /// # use rustix::net::RecvAncillaryBuffer;
+    /// let mut space = [0; rustix::cmsg_space!(ScmRights(2), ScmCredentials(1))];
+    /// let mut cmsg_buffer = RecvAncillaryBuffer::new(&mut space);
+    /// # }
+    /// ```
+    ///
+    /// [`recv`]: crate::net::recv
+    #[inline]
+    pub fn new(buffer: &'buf mut [u8]) -> Self {
+        Self {
+            buffer: align_for_cmsghdr(buffer),
+            read: 0,
+            length: 0,
+        }
+    }
+
+    /// Returns a pointer to the message data.
+    pub(crate) fn as_control_ptr(&mut self) -> *mut u8 {
+        // When the length is zero, we may be using a `&[]` address, which may
+        // be an invalid but non-null pointer, and on some platforms, that
+        // causes `sendmsg` to fail with `EFAULT` or `EINVAL`
+        #[cfg(not(linux_kernel))]
+        if self.buffer.is_empty() {
+            return core::ptr::null_mut();
+        }
+
+        self.buffer.as_mut_ptr()
+    }
+
+    /// Returns the length of the message data.
+    pub(crate) fn control_len(&self) -> usize {
+        self.buffer.len()
+    }
+
+    /// Set the length of the message data.
+    ///
+    /// # Safety
+    ///
+    /// The buffer must be filled with valid message data.
+    pub(crate) unsafe fn set_control_len(&mut self, len: usize) {
+        self.length = len;
+        self.read = 0;
+    }
+
+    /// Delete all messages from the buffer.
+    pub(crate) fn clear(&mut self) {
+        self.drain().for_each(drop);
+    }
+
+    /// Drain all messages from the buffer.
+    pub fn drain(&mut self) -> AncillaryDrain<'_> {
+        AncillaryDrain {
+            messages: messages::Messages::new(&mut self.buffer[self.read..][..self.length]),
+            read: &mut self.read,
+            length: &mut self.length,
+        }
+    }
+}
+
+impl Drop for RecvAncillaryBuffer<'_> {
+    fn drop(&mut self) {
+        self.clear();
+    }
+}
+
+/// Return a slice of `buffer` starting at the first `cmsghdr` alignment
+/// boundary.
+#[inline]
+fn align_for_cmsghdr(buffer: &mut [u8]) -> &mut [u8] {
+    // If the buffer is empty, we won't be writing anything into it, so it
+    // doesn't need to be aligned.
+    if buffer.is_empty() {
+        return buffer;
+    }
+
+    let align = align_of::<c::cmsghdr>();
+    let addr = buffer.as_ptr() as usize;
+    let adjusted = (addr + (align - 1)) & align.wrapping_neg();
+    &mut buffer[adjusted - addr..]
+}
+
+/// An iterator that drains messages from a [`RecvAncillaryBuffer`].
+pub struct AncillaryDrain<'buf> {
+    /// Inner iterator over messages.
+    messages: messages::Messages<'buf>,
+
+    /// Increment the number of messages we've read.
+    read: &'buf mut usize,
+
+    /// Decrement the total length.
+    length: &'buf mut usize,
+}
+
+impl<'buf> AncillaryDrain<'buf> {
+    /// A closure that converts a message into a [`RecvAncillaryMessage`].
+    fn cvt_msg(
+        read: &mut usize,
+        length: &mut usize,
+        msg: &c::cmsghdr,
+    ) -> Option<RecvAncillaryMessage<'buf>> {
+        unsafe {
+            // Advance the `read` pointer.
+            let msg_len = msg.cmsg_len as usize;
+            *read += msg_len;
+            *length -= msg_len;
+
+            // Get a pointer to the payload.
+            let payload = c::CMSG_DATA(msg);
+            let payload_len = msg.cmsg_len as usize - c::CMSG_LEN(0) as usize;
+
+            // Get a mutable slice of the payload.
+            let payload: &'buf mut [u8] = slice::from_raw_parts_mut(payload, payload_len);
+
+            // Determine what type it is.
+            let (level, msg_type) = (msg.cmsg_level, msg.cmsg_type);
+            match (level as _, msg_type as _) {
+                (c::SOL_SOCKET, c::SCM_RIGHTS) => {
+                    // Create an iterator that reads out the file descriptors.
+                    let fds = AncillaryIter::new(payload);
+
+                    Some(RecvAncillaryMessage::ScmRights(fds))
+                }
+                #[cfg(linux_kernel)]
+                (c::SOL_SOCKET, c::SCM_CREDENTIALS) => {
+                    if payload_len >= size_of::<UCred>() {
+                        let ucred = payload.as_ptr().cast::<UCred>().read_unaligned();
+                        Some(RecvAncillaryMessage::ScmCredentials(ucred))
+                    } else {
+                        None
+                    }
+                }
+                _ => None,
+            }
+        }
+    }
+}
+
+impl<'buf> Iterator for AncillaryDrain<'buf> {
+    type Item = RecvAncillaryMessage<'buf>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let read = &mut self.read;
+        let length = &mut self.length;
+        self.messages.find_map(|ev| Self::cvt_msg(read, length, ev))
+    }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        let (_, max) = self.messages.size_hint();
+        (0, max)
+    }
+
+    fn fold<B, F>(self, init: B, f: F) -> B
+    where
+        Self: Sized,
+        F: FnMut(B, Self::Item) -> B,
+    {
+        let read = self.read;
+        let length = self.length;
+        self.messages
+            .filter_map(|ev| Self::cvt_msg(read, length, ev))
+            .fold(init, f)
+    }
+
+    fn count(self) -> usize {
+        let read = self.read;
+        let length = self.length;
+        self.messages
+            .filter_map(|ev| Self::cvt_msg(read, length, ev))
+            .count()
+    }
+
+    fn last(self) -> Option<Self::Item>
+    where
+        Self: Sized,
+    {
+        let read = self.read;
+        let length = self.length;
+        self.messages
+            .filter_map(|ev| Self::cvt_msg(read, length, ev))
+            .last()
+    }
+
+    fn collect<B: FromIterator<Self::Item>>(self) -> B
+    where
+        Self: Sized,
+    {
+        let read = self.read;
+        let length = self.length;
+        self.messages
+            .filter_map(|ev| Self::cvt_msg(read, length, ev))
+            .collect()
+    }
+}
+
+impl FusedIterator for AncillaryDrain<'_> {}
+
+/// `sendmsg(msghdr)`—Sends a message on a socket.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sendmsg.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/sendmsg.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/sendmsg.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=sendmsg&sektion=2
+/// [NetBSD]: https://man.netbsd.org/sendmsg.2
+/// [OpenBSD]: https://man.openbsd.org/sendmsg.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=sendmsg&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/sendmsg
+#[inline]
+pub fn sendmsg(
+    socket: impl AsFd,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    flags: SendFlags,
+) -> io::Result<usize> {
+    backend::net::syscalls::sendmsg(socket.as_fd(), iov, control, flags)
+}
+
+/// `sendmsg(msghdr)`—Sends a message on a socket to a specific IPv4 address.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sendmsg.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/sendmsg.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/sendmsg.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=sendmsg&sektion=2
+/// [NetBSD]: https://man.netbsd.org/sendmsg.2
+/// [OpenBSD]: https://man.openbsd.org/sendmsg.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=sendmsg&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/sendmsg
+#[inline]
+pub fn sendmsg_v4(
+    socket: impl AsFd,
+    addr: &SocketAddrV4,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    flags: SendFlags,
+) -> io::Result<usize> {
+    backend::net::syscalls::sendmsg_v4(socket.as_fd(), addr, iov, control, flags)
+}
+
+/// `sendmsg(msghdr)`—Sends a message on a socket to a specific IPv6 address.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sendmsg.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/sendmsg.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/sendmsg.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=sendmsg&sektion=2
+/// [NetBSD]: https://man.netbsd.org/sendmsg.2
+/// [OpenBSD]: https://man.openbsd.org/sendmsg.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=sendmsg&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/sendmsg
+#[inline]
+pub fn sendmsg_v6(
+    socket: impl AsFd,
+    addr: &SocketAddrV6,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    flags: SendFlags,
+) -> io::Result<usize> {
+    backend::net::syscalls::sendmsg_v6(socket.as_fd(), addr, iov, control, flags)
+}
+
+/// `sendmsg(msghdr)`—Sends a message on a socket to a specific Unix-domain
+/// address.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sendmsg.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/sendmsg.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/sendmsg.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=sendmsg&sektion=2
+/// [NetBSD]: https://man.netbsd.org/sendmsg.2
+/// [OpenBSD]: https://man.openbsd.org/sendmsg.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=sendmsg&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/sendmsg
+#[inline]
+#[cfg(unix)]
+pub fn sendmsg_unix(
+    socket: impl AsFd,
+    addr: &super::SocketAddrUnix,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    flags: SendFlags,
+) -> io::Result<usize> {
+    backend::net::syscalls::sendmsg_unix(socket.as_fd(), addr, iov, control, flags)
+}
+
+/// `sendmsg(msghdr)`—Sends a message on a socket to a specific address.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sendmsg.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/sendmsg.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/sendmsg.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=sendmsg&sektion=2
+/// [NetBSD]: https://man.netbsd.org/sendmsg.2
+/// [OpenBSD]: https://man.openbsd.org/sendmsg.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=sendmsg&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/sendmsg
+#[inline]
+pub fn sendmsg_any(
+    socket: impl AsFd,
+    addr: Option<&SocketAddrAny>,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    flags: SendFlags,
+) -> io::Result<usize> {
+    match addr {
+        None => backend::net::syscalls::sendmsg(socket.as_fd(), iov, control, flags),
+        Some(SocketAddrAny::V4(addr)) => {
+            backend::net::syscalls::sendmsg_v4(socket.as_fd(), addr, iov, control, flags)
+        }
+        Some(SocketAddrAny::V6(addr)) => {
+            backend::net::syscalls::sendmsg_v6(socket.as_fd(), addr, iov, control, flags)
+        }
+        #[cfg(unix)]
+        Some(SocketAddrAny::Unix(addr)) => {
+            backend::net::syscalls::sendmsg_unix(socket.as_fd(), addr, iov, control, flags)
+        }
+    }
+}
+
+/// `recvmsg(msghdr)`—Receives a message from a socket.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/recvmsg.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/recvmsg.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/recvmsg.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=recvmsg&sektion=2
+/// [NetBSD]: https://man.netbsd.org/recvmsg.2
+/// [OpenBSD]: https://man.openbsd.org/recvmsg.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=recvmsg&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/recvmsg
+#[inline]
+pub fn recvmsg(
+    socket: impl AsFd,
+    iov: &mut [IoSliceMut<'_>],
+    control: &mut RecvAncillaryBuffer<'_>,
+    flags: RecvFlags,
+) -> io::Result<RecvMsgReturn> {
+    backend::net::syscalls::recvmsg(socket.as_fd(), iov, control, flags)
+}
+
+/// The result of a successful [`recvmsg`] call.
+pub struct RecvMsgReturn {
+    /// The number of bytes received.
+    pub bytes: usize,
+
+    /// The flags received.
+    pub flags: RecvFlags,
+
+    /// The address of the socket we received from, if any.
+    pub address: Option<SocketAddrAny>,
+}
+
+/// An iterator over data in an ancillary buffer.
+pub struct AncillaryIter<'data, T> {
+    /// The data we're iterating over.
+    data: &'data mut [u8],
+
+    /// The raw data we're removing.
+    _marker: PhantomData<T>,
+}
+
+impl<'data, T> AncillaryIter<'data, T> {
+    /// Create a new iterator over data in an ancillary buffer.
+    ///
+    /// # Safety
+    ///
+    /// The buffer must contain valid ancillary data.
+    unsafe fn new(data: &'data mut [u8]) -> Self {
+        assert_eq!(data.len() % size_of::<T>(), 0);
+
+        Self {
+            data,
+            _marker: PhantomData,
+        }
+    }
+}
+
+impl<'data, T> Drop for AncillaryIter<'data, T> {
+    fn drop(&mut self) {
+        self.for_each(drop);
+    }
+}
+
+impl<T> Iterator for AncillaryIter<'_, T> {
+    type Item = T;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        // See if there is a next item.
+        if self.data.len() < size_of::<T>() {
+            return None;
+        }
+
+        // Get the next item.
+        let item = unsafe { self.data.as_ptr().cast::<T>().read_unaligned() };
+
+        // Move forward.
+        let data = take(&mut self.data);
+        self.data = &mut data[size_of::<T>()..];
+
+        Some(item)
+    }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        let len = self.len();
+        (len, Some(len))
+    }
+
+    fn count(self) -> usize {
+        self.len()
+    }
+
+    fn last(mut self) -> Option<Self::Item> {
+        self.next_back()
+    }
+}
+
+impl<T> FusedIterator for AncillaryIter<'_, T> {}
+
+impl<T> ExactSizeIterator for AncillaryIter<'_, T> {
+    fn len(&self) -> usize {
+        self.data.len() / size_of::<T>()
+    }
+}
+
+impl<T> DoubleEndedIterator for AncillaryIter<'_, T> {
+    fn next_back(&mut self) -> Option<Self::Item> {
+        // See if there is a next item.
+        if self.data.len() < size_of::<T>() {
+            return None;
+        }
+
+        // Get the next item.
+        let item = unsafe {
+            let ptr = self.data.as_ptr().add(self.data.len() - size_of::<T>());
+            ptr.cast::<T>().read_unaligned()
+        };
+
+        // Move forward.
+        let len = self.data.len();
+        let data = take(&mut self.data);
+        self.data = &mut data[..len - size_of::<T>()];
+
+        Some(item)
+    }
+}
+
+mod messages {
+    use crate::backend::c;
+    use crate::backend::net::msghdr;
+    use core::iter::FusedIterator;
+    use core::marker::PhantomData;
+    use core::ptr::NonNull;
+
+    /// An iterator over the messages in an ancillary buffer.
+    pub(super) struct Messages<'buf> {
+        /// The message header we're using to iterate over the messages.
+        msghdr: c::msghdr,
+
+        /// The current pointer to the next message header to return.
+        ///
+        /// This has a lifetime of `'buf`.
+        header: Option<NonNull<c::cmsghdr>>,
+
+        /// Capture the original lifetime of the buffer.
+        _buffer: PhantomData<&'buf mut [u8]>,
+    }
+
+    impl<'buf> Messages<'buf> {
+        /// Create a new iterator over messages from a byte buffer.
+        pub(super) fn new(buf: &'buf mut [u8]) -> Self {
+            let msghdr = {
+                let mut h = msghdr::zero_msghdr();
+                h.msg_control = buf.as_mut_ptr().cast();
+                h.msg_controllen = buf.len().try_into().expect("buffer too large for msghdr");
+                h
+            };
+
+            // Get the first header.
+            let header = NonNull::new(unsafe { c::CMSG_FIRSTHDR(&msghdr) });
+
+            Self {
+                msghdr,
+                header,
+                _buffer: PhantomData,
+            }
+        }
+    }
+
+    impl<'a> Iterator for Messages<'a> {
+        type Item = &'a mut c::cmsghdr;
+
+        #[inline]
+        fn next(&mut self) -> Option<Self::Item> {
+            // Get the current header.
+            let header = self.header?;
+
+            // Get the next header.
+            self.header = NonNull::new(unsafe { c::CMSG_NXTHDR(&self.msghdr, header.as_ptr()) });
+
+            // If the headers are equal, we're done.
+            if Some(header) == self.header {
+                self.header = None;
+            }
+
+            // SAFETY: The lifetime of `header` is tied to this.
+            Some(unsafe { &mut *header.as_ptr() })
+        }
+
+        fn size_hint(&self) -> (usize, Option<usize>) {
+            if self.header.is_some() {
+                // The remaining buffer *could* be filled with zero-length
+                // messages.
+                let max_size = unsafe { c::CMSG_LEN(0) } as usize;
+                let remaining_count = self.msghdr.msg_controllen as usize / max_size;
+                (1, Some(remaining_count))
+            } else {
+                (0, Some(0))
+            }
+        }
+    }
+
+    impl FusedIterator for Messages<'_> {}
+}
diff --git a/vendor/rustix/src/net/socket.rs b/vendor/rustix/src/net/socket.rs
new file mode 100644
index 0000000..c01b7a4
--- /dev/null
+++ b/vendor/rustix/src/net/socket.rs
@@ -0,0 +1,750 @@
+use crate::fd::OwnedFd;
+use crate::net::{SocketAddr, SocketAddrAny, SocketAddrV4, SocketAddrV6};
+use crate::{backend, io};
+use backend::fd::{AsFd, BorrowedFd};
+
+pub use crate::net::{AddressFamily, Protocol, Shutdown, SocketFlags, SocketType};
+#[cfg(unix)]
+pub use backend::net::addr::SocketAddrUnix;
+
+/// `socket(domain, type_, protocol)`—Creates a socket.
+///
+/// POSIX guarantees that `socket` will use the lowest unused file descriptor,
+/// however it is not safe in general to rely on this, as file descriptors may
+/// be unexpectedly allocated on other threads or in libraries.
+///
+/// To pass extra flags such as [`SocketFlags::CLOEXEC`] or
+/// [`SocketFlags::NONBLOCK`], use [`socket_with`].
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#socket
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/socket.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/socket.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/socket.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-socket
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=socket&sektion=2
+/// [NetBSD]: https://man.netbsd.org/socket.2
+/// [OpenBSD]: https://man.openbsd.org/socket.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=socket&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/socket
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Creating-a-Socket.html
+#[inline]
+pub fn socket(
+    domain: AddressFamily,
+    type_: SocketType,
+    protocol: Option<Protocol>,
+) -> io::Result<OwnedFd> {
+    backend::net::syscalls::socket(domain, type_, protocol)
+}
+
+/// `socket_with(domain, type_ | flags, protocol)`—Creates a socket, with
+/// flags.
+///
+/// POSIX guarantees that `socket` will use the lowest unused file descriptor,
+/// however it is not safe in general to rely on this, as file descriptors may
+/// be unexpectedly allocated on other threads or in libraries.
+///
+/// `socket_with` is the same as [`socket`] but adds an additional flags
+/// operand.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#socket
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/socket.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/socket.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/socket.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-socket
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=socket&sektion=2
+/// [NetBSD]: https://man.netbsd.org/socket.2
+/// [OpenBSD]: https://man.openbsd.org/socket.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=socket&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/socket
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Creating-a-Socket.html
+#[doc(alias("socket"))]
+#[inline]
+pub fn socket_with(
+    domain: AddressFamily,
+    type_: SocketType,
+    flags: SocketFlags,
+    protocol: Option<Protocol>,
+) -> io::Result<OwnedFd> {
+    backend::net::syscalls::socket_with(domain, type_, flags, protocol)
+}
+
+/// `bind(sockfd, addr)`—Binds a socket to an IP address.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#bind
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/bind.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/bind.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/bind.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-bind
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=bind&sektion=2
+/// [NetBSD]: https://man.netbsd.org/bind.2
+/// [OpenBSD]: https://man.openbsd.org/bind.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=bind&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/bind
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Setting-Address.html
+pub fn bind<Fd: AsFd>(sockfd: Fd, addr: &SocketAddr) -> io::Result<()> {
+    _bind(sockfd.as_fd(), addr)
+}
+
+fn _bind(sockfd: BorrowedFd<'_>, addr: &SocketAddr) -> io::Result<()> {
+    match addr {
+        SocketAddr::V4(v4) => backend::net::syscalls::bind_v4(sockfd, v4),
+        SocketAddr::V6(v6) => backend::net::syscalls::bind_v6(sockfd, v6),
+    }
+}
+
+/// `bind(sockfd, addr)`—Binds a socket to an address.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#bind
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/bind.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/bind.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/bind.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-bind
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=bind&sektion=2
+/// [NetBSD]: https://man.netbsd.org/bind.2
+/// [OpenBSD]: https://man.openbsd.org/bind.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=bind&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/bind
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Setting-Address.html
+#[doc(alias = "bind")]
+pub fn bind_any<Fd: AsFd>(sockfd: Fd, addr: &SocketAddrAny) -> io::Result<()> {
+    _bind_any(sockfd.as_fd(), addr)
+}
+
+fn _bind_any(sockfd: BorrowedFd<'_>, addr: &SocketAddrAny) -> io::Result<()> {
+    match addr {
+        SocketAddrAny::V4(v4) => backend::net::syscalls::bind_v4(sockfd, v4),
+        SocketAddrAny::V6(v6) => backend::net::syscalls::bind_v6(sockfd, v6),
+        #[cfg(unix)]
+        SocketAddrAny::Unix(unix) => backend::net::syscalls::bind_unix(sockfd, unix),
+    }
+}
+
+/// `bind(sockfd, addr, sizeof(struct sockaddr_in))`—Binds a socket to an
+/// IPv4 address.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#bind
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/bind.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/bind.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/bind.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-bind
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=bind&sektion=2
+/// [NetBSD]: https://man.netbsd.org/bind.2
+/// [OpenBSD]: https://man.openbsd.org/bind.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=bind&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/bind
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Setting-Address.html
+#[inline]
+#[doc(alias = "bind")]
+pub fn bind_v4<Fd: AsFd>(sockfd: Fd, addr: &SocketAddrV4) -> io::Result<()> {
+    backend::net::syscalls::bind_v4(sockfd.as_fd(), addr)
+}
+
+/// `bind(sockfd, addr, sizeof(struct sockaddr_in6))`—Binds a socket to an
+/// IPv6 address.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#bind
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/bind.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/bind.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/bind.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-bind
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=bind&sektion=2
+/// [NetBSD]: https://man.netbsd.org/bind.2
+/// [OpenBSD]: https://man.openbsd.org/bind.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=bind&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/bind
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Setting-Address.html
+#[inline]
+#[doc(alias = "bind")]
+pub fn bind_v6<Fd: AsFd>(sockfd: Fd, addr: &SocketAddrV6) -> io::Result<()> {
+    backend::net::syscalls::bind_v6(sockfd.as_fd(), addr)
+}
+
+/// `bind(sockfd, addr, sizeof(struct sockaddr_un))`—Binds a socket to a
+/// Unix-domain address.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#bind
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/bind.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/bind.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/bind.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-bind
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=bind&sektion=2
+/// [NetBSD]: https://man.netbsd.org/bind.2
+/// [OpenBSD]: https://man.openbsd.org/bind.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=bind&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/bind
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Setting-Address.html
+#[cfg(unix)]
+#[inline]
+#[doc(alias = "bind")]
+pub fn bind_unix<Fd: AsFd>(sockfd: Fd, addr: &SocketAddrUnix) -> io::Result<()> {
+    backend::net::syscalls::bind_unix(sockfd.as_fd(), addr)
+}
+
+/// `connect(sockfd, addr)`—Initiates a connection to an IP address.
+///
+/// On Windows, a non-blocking socket returns [`Errno::WOULDBLOCK`] if the
+/// connection cannot be completed immediately, rather than
+/// `Errno::INPROGRESS`.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#connect
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/connect.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/connect.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/connect.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-connect
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=connect&sektion=2
+/// [NetBSD]: https://man.netbsd.org/connect.2
+/// [OpenBSD]: https://man.openbsd.org/connect.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=connect&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/connect
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Connecting.html
+/// [`Errno::WOULDBLOCK`]: io::Errno::WOULDBLOCK
+pub fn connect<Fd: AsFd>(sockfd: Fd, addr: &SocketAddr) -> io::Result<()> {
+    _connect(sockfd.as_fd(), addr)
+}
+
+fn _connect(sockfd: BorrowedFd<'_>, addr: &SocketAddr) -> io::Result<()> {
+    match addr {
+        SocketAddr::V4(v4) => backend::net::syscalls::connect_v4(sockfd, v4),
+        SocketAddr::V6(v6) => backend::net::syscalls::connect_v6(sockfd, v6),
+    }
+}
+
+/// `connect(sockfd, addr)`—Initiates a connection.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#connect
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/connect.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/connect.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/connect.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-connect
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=connect&sektion=2
+/// [NetBSD]: https://man.netbsd.org/connect.2
+/// [OpenBSD]: https://man.openbsd.org/connect.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=connect&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/connect
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Connecting.html
+#[doc(alias = "connect")]
+pub fn connect_any<Fd: AsFd>(sockfd: Fd, addr: &SocketAddrAny) -> io::Result<()> {
+    _connect_any(sockfd.as_fd(), addr)
+}
+
+fn _connect_any(sockfd: BorrowedFd<'_>, addr: &SocketAddrAny) -> io::Result<()> {
+    match addr {
+        SocketAddrAny::V4(v4) => backend::net::syscalls::connect_v4(sockfd, v4),
+        SocketAddrAny::V6(v6) => backend::net::syscalls::connect_v6(sockfd, v6),
+        #[cfg(unix)]
+        SocketAddrAny::Unix(unix) => backend::net::syscalls::connect_unix(sockfd, unix),
+    }
+}
+
+/// `connect(sockfd, addr, sizeof(struct sockaddr_in))`—Initiates a
+/// connection to an IPv4 address.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#connect
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/connect.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/connect.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/connect.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-connect
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=connect&sektion=2
+/// [NetBSD]: https://man.netbsd.org/connect.2
+/// [OpenBSD]: https://man.openbsd.org/connect.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=connect&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/connect
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Connecting.html
+#[inline]
+#[doc(alias = "connect")]
+pub fn connect_v4<Fd: AsFd>(sockfd: Fd, addr: &SocketAddrV4) -> io::Result<()> {
+    backend::net::syscalls::connect_v4(sockfd.as_fd(), addr)
+}
+
+/// `connect(sockfd, addr, sizeof(struct sockaddr_in6))`—Initiates a
+/// connection to an IPv6 address.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#connect
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/connect.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/connect.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/connect.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-connect
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=connect&sektion=2
+/// [NetBSD]: https://man.netbsd.org/connect.2
+/// [OpenBSD]: https://man.openbsd.org/connect.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=connect&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/connect
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Connecting.html
+#[inline]
+#[doc(alias = "connect")]
+pub fn connect_v6<Fd: AsFd>(sockfd: Fd, addr: &SocketAddrV6) -> io::Result<()> {
+    backend::net::syscalls::connect_v6(sockfd.as_fd(), addr)
+}
+
+/// `connect(sockfd, addr, sizeof(struct sockaddr_un))`—Initiates a
+/// connection to a Unix-domain address.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#connect
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/connect.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/connect.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/connect.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-connect
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=connect&sektion=2
+/// [NetBSD]: https://man.netbsd.org/connect.2
+/// [OpenBSD]: https://man.openbsd.org/connect.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=connect&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/connect
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Connecting.html
+#[cfg(unix)]
+#[inline]
+#[doc(alias = "connect")]
+pub fn connect_unix<Fd: AsFd>(sockfd: Fd, addr: &SocketAddrUnix) -> io::Result<()> {
+    backend::net::syscalls::connect_unix(sockfd.as_fd(), addr)
+}
+
+/// `connect(sockfd, {.sa_family = AF_UNSPEC}, sizeof(struct sockaddr))`
+/// — Dissolve the socket's association.
+///
+/// On UDP sockets, BSD platforms report [`Errno::AFNOSUPPORT`] or
+/// [`Errno::INVAL`] even if the disconnect was successful.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#connect
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/connect.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/connect.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/connect.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-connect
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=connect&sektion=2
+/// [NetBSD]: https://man.netbsd.org/connect.2
+/// [OpenBSD]: https://man.openbsd.org/connect.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=connect&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/connect
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Connecting.html
+/// [`Errno::AFNOSUPPORT`]: io::Errno::AFNOSUPPORT
+/// [`Errno::INVAL`]: io::Errno::INVAL
+#[inline]
+#[doc(alias = "connect")]
+pub fn connect_unspec<Fd: AsFd>(sockfd: Fd) -> io::Result<()> {
+    backend::net::syscalls::connect_unspec(sockfd.as_fd())
+}
+
+/// `listen(fd, backlog)`—Enables listening for incoming connections.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#listen
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/listen.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/listen.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/listen.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-listen
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=listen&sektion=2
+/// [NetBSD]: https://man.netbsd.org/listen.2
+/// [OpenBSD]: https://man.openbsd.org/listen.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=listen&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/listen
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Listening.html
+#[inline]
+pub fn listen<Fd: AsFd>(sockfd: Fd, backlog: i32) -> io::Result<()> {
+    backend::net::syscalls::listen(sockfd.as_fd(), backlog)
+}
+
+/// `accept(fd, NULL, NULL)`—Accepts an incoming connection.
+///
+/// Use [`acceptfrom`] to retrieve the peer address.
+///
+/// POSIX guarantees that `accept` will use the lowest unused file descriptor,
+/// however it is not safe in general to rely on this, as file descriptors may
+/// be unexpectedly allocated on other threads or in libraries.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#acceptthank-you-for-calling-port-3490.
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/accept.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/accept.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/accept.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-accept
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=accept&sektion=2
+/// [NetBSD]: https://man.netbsd.org/accept.2
+/// [OpenBSD]: https://man.openbsd.org/accept.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=accept&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/accept
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Accepting-Connections.html
+#[inline]
+pub fn accept<Fd: AsFd>(sockfd: Fd) -> io::Result<OwnedFd> {
+    backend::net::syscalls::accept(sockfd.as_fd())
+}
+
+/// `accept4(fd, NULL, NULL, flags)`—Accepts an incoming connection, with
+/// flags.
+///
+/// Use [`acceptfrom_with`] to retrieve the peer address.
+///
+/// Even though POSIX guarantees that this will use the lowest unused file
+/// descriptor, it is not safe in general to rely on this, as file descriptors
+/// may be unexpectedly allocated on other threads or in libraries.
+///
+/// `accept_with` is the same as [`accept`] but adds an additional flags
+/// operand.
+///
+/// # References
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/accept4.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=accept4&sektion=2
+/// [NetBSD]: https://man.netbsd.org/accept4.2
+/// [OpenBSD]: https://man.openbsd.org/accept4.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=accept4&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/accept4
+#[inline]
+#[doc(alias = "accept4")]
+pub fn accept_with<Fd: AsFd>(sockfd: Fd, flags: SocketFlags) -> io::Result<OwnedFd> {
+    backend::net::syscalls::accept_with(sockfd.as_fd(), flags)
+}
+
+/// `accept(fd, &addr, &len)`—Accepts an incoming connection and returns the
+/// peer address.
+///
+/// Use [`accept`] if the peer address isn't needed.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#acceptthank-you-for-calling-port-3490.
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/accept.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/accept.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/accept.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-accept
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=accept&sektion=2
+/// [NetBSD]: https://man.netbsd.org/accept.2
+/// [OpenBSD]: https://man.openbsd.org/accept.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=accept&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/accept
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Accepting-Connections.html
+#[inline]
+#[doc(alias = "accept")]
+pub fn acceptfrom<Fd: AsFd>(sockfd: Fd) -> io::Result<(OwnedFd, Option<SocketAddrAny>)> {
+    backend::net::syscalls::acceptfrom(sockfd.as_fd())
+}
+
+/// `accept4(fd, &addr, &len, flags)`—Accepts an incoming connection and
+/// returns the peer address, with flags.
+///
+/// Use [`accept_with`] if the peer address isn't needed.
+///
+/// `acceptfrom_with` is the same as [`acceptfrom`] but adds an additional
+/// flags operand.
+///
+/// # References
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/accept4.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=accept4&sektion=2
+/// [NetBSD]: https://man.netbsd.org/accept4.2
+/// [OpenBSD]: https://man.openbsd.org/accept4.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=accept4&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/accept4
+#[inline]
+#[doc(alias = "accept4")]
+pub fn acceptfrom_with<Fd: AsFd>(
+    sockfd: Fd,
+    flags: SocketFlags,
+) -> io::Result<(OwnedFd, Option<SocketAddrAny>)> {
+    backend::net::syscalls::acceptfrom_with(sockfd.as_fd(), flags)
+}
+
+/// `shutdown(fd, how)`—Closes the read and/or write sides of a stream.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#close-and-shutdownget-outta-my-face
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/shutdown.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/shutdown.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/shutdown.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-shutdown
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=shutdown&sektion=2
+/// [NetBSD]: https://man.netbsd.org/shutdown.2
+/// [OpenBSD]: https://man.openbsd.org/shutdown.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=shutdown&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/shutdown
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Closing-a-Socket.html
+#[inline]
+pub fn shutdown<Fd: AsFd>(sockfd: Fd, how: Shutdown) -> io::Result<()> {
+    backend::net::syscalls::shutdown(sockfd.as_fd(), how)
+}
+
+/// `getsockname(fd, addr, len)`—Returns the address a socket is bound to.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockname.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/getsockname.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockname.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockname
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=getsockname&sektion=2
+/// [NetBSD]: https://man.netbsd.org/getsockname.2
+/// [OpenBSD]: https://man.openbsd.org/getsockname.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=getsockname&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/getsockname
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Reading-Address.html
+#[inline]
+pub fn getsockname<Fd: AsFd>(sockfd: Fd) -> io::Result<SocketAddrAny> {
+    backend::net::syscalls::getsockname(sockfd.as_fd())
+}
+
+/// `getpeername(fd, addr, len)`—Returns the address a socket is connected
+/// to.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#getpeernamewho-are-you
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getpeername.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/getpeername.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getpeername.2.html
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getpeername
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=getpeername&sektion=2
+/// [NetBSD]: https://man.netbsd.org/getpeername.2
+/// [OpenBSD]: https://man.openbsd.org/getpeername.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=getpeername&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/getpeername
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Who-is-Connected.html
+#[inline]
+pub fn getpeername<Fd: AsFd>(sockfd: Fd) -> io::Result<Option<SocketAddrAny>> {
+    backend::net::syscalls::getpeername(sockfd.as_fd())
+}
diff --git a/vendor/rustix/src/net/socket_addr_any.rs b/vendor/rustix/src/net/socket_addr_any.rs
new file mode 100644
index 0000000..a649015
--- /dev/null
+++ b/vendor/rustix/src/net/socket_addr_any.rs
@@ -0,0 +1,113 @@
+//! A socket address for any kind of socket.
+//!
+//! This is similar to [`std::net::SocketAddr`], but also supports Unix-domain
+//! socket addresses on Unix.
+//!
+//! # Safety
+//!
+//! The `read` and `write` functions allow decoding and encoding from and to
+//! OS-specific socket address representations in memory.
+#![allow(unsafe_code)]
+
+#[cfg(unix)]
+use crate::net::SocketAddrUnix;
+use crate::net::{AddressFamily, SocketAddr, SocketAddrV4, SocketAddrV6};
+use crate::{backend, io};
+#[cfg(feature = "std")]
+use core::fmt;
+
+pub use backend::net::addr::SocketAddrStorage;
+
+/// `struct sockaddr_storage` as a Rust enum.
+#[derive(Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
+#[doc(alias = "sockaddr")]
+#[non_exhaustive]
+pub enum SocketAddrAny {
+    /// `struct sockaddr_in`
+    V4(SocketAddrV4),
+    /// `struct sockaddr_in6`
+    V6(SocketAddrV6),
+    /// `struct sockaddr_un`
+    #[cfg(unix)]
+    Unix(SocketAddrUnix),
+}
+
+impl From<SocketAddr> for SocketAddrAny {
+    #[inline]
+    fn from(from: SocketAddr) -> Self {
+        match from {
+            SocketAddr::V4(v4) => Self::V4(v4),
+            SocketAddr::V6(v6) => Self::V6(v6),
+        }
+    }
+}
+
+impl From<SocketAddrV4> for SocketAddrAny {
+    #[inline]
+    fn from(from: SocketAddrV4) -> Self {
+        Self::V4(from)
+    }
+}
+
+impl From<SocketAddrV6> for SocketAddrAny {
+    #[inline]
+    fn from(from: SocketAddrV6) -> Self {
+        Self::V6(from)
+    }
+}
+
+#[cfg(unix)]
+impl From<SocketAddrUnix> for SocketAddrAny {
+    #[inline]
+    fn from(from: SocketAddrUnix) -> Self {
+        Self::Unix(from)
+    }
+}
+
+impl SocketAddrAny {
+    /// Return the address family of this socket address.
+    #[inline]
+    pub const fn address_family(&self) -> AddressFamily {
+        match self {
+            Self::V4(_) => AddressFamily::INET,
+            Self::V6(_) => AddressFamily::INET6,
+            #[cfg(unix)]
+            Self::Unix(_) => AddressFamily::UNIX,
+        }
+    }
+
+    /// Writes a platform-specific encoding of this socket address to
+    /// the memory pointed to by `storage`, and returns the number of
+    /// bytes used.
+    ///
+    /// # Safety
+    ///
+    /// `storage` must point to valid memory for encoding the socket
+    /// address.
+    pub unsafe fn write(&self, storage: *mut SocketAddrStorage) -> usize {
+        backend::net::write_sockaddr::write_sockaddr(self, storage)
+    }
+
+    /// Reads a platform-specific encoding of a socket address from
+    /// the memory pointed to by `storage`, which uses `len` bytes.
+    ///
+    /// # Safety
+    ///
+    /// `storage` must point to valid memory for decoding a socket
+    /// address.
+    pub unsafe fn read(storage: *const SocketAddrStorage, len: usize) -> io::Result<Self> {
+        backend::net::read_sockaddr::read_sockaddr(storage, len)
+    }
+}
+
+#[cfg(feature = "std")]
+impl fmt::Debug for SocketAddrAny {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::V4(v4) => v4.fmt(fmt),
+            Self::V6(v6) => v6.fmt(fmt),
+            #[cfg(unix)]
+            Self::Unix(unix) => unix.fmt(fmt),
+        }
+    }
+}
diff --git a/vendor/rustix/src/net/socketpair.rs b/vendor/rustix/src/net/socketpair.rs
new file mode 100644
index 0000000..7228e71
--- /dev/null
+++ b/vendor/rustix/src/net/socketpair.rs
@@ -0,0 +1,36 @@
+use crate::fd::OwnedFd;
+use crate::net::{AddressFamily, Protocol, SocketFlags, SocketType};
+use crate::{backend, io};
+
+/// `socketpair(domain, type_ | accept_flags, protocol)`—Create a pair of
+/// sockets that are connected to each other.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/socketpair.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/socketpair.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/socketpair.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=socketpair&sektion=2
+/// [NetBSD]: https://man.netbsd.org/socketpair.2
+/// [OpenBSD]: https://man.openbsd.org/socketpair.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=socketpair&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/socketpair
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Socket-Pairs.html
+#[inline]
+pub fn socketpair(
+    domain: AddressFamily,
+    type_: SocketType,
+    flags: SocketFlags,
+    protocol: Option<Protocol>,
+) -> io::Result<(OwnedFd, OwnedFd)> {
+    backend::net::syscalls::socketpair(domain, type_, flags, protocol)
+}
diff --git a/vendor/rustix/src/net/sockopt.rs b/vendor/rustix/src/net/sockopt.rs
new file mode 100644
index 0000000..df04c4a
--- /dev/null
+++ b/vendor/rustix/src/net/sockopt.rs
@@ -0,0 +1,1382 @@
+//! `getsockopt` and `setsockopt` functions.
+//!
+//! In the rustix API, there is a separate function for each option, so that it
+//! can be given an option-specific type signature.
+//!
+//! # References for all `get_*` functions:
+//!
+//!  - [POSIX `getsockopt`]
+//!  - [Linux `getsockopt`]
+//!  - [Winsock `getsockopt`]
+//!  - [Apple `getsockopt`]
+//!  - [FreeBSD `getsockopt`]
+//!  - [NetBSD `getsockopt`]
+//!  - [OpenBSD `getsockopt`]
+//!  - [DragonFly BSD `getsockopt`]
+//!  - [illumos `getsockopt`]
+//!  - [glibc `getsockopt`]
+//!
+//! [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
+//! [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
+//! [Winsock `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
+//! [Apple `getsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
+//! [FreeBSD `getsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
+//! [NetBSD `getsockopt`]: https://man.netbsd.org/getsockopt.2
+//! [OpenBSD `getsockopt`]: https://man.openbsd.org/getsockopt.2
+//! [DragonFly BSD `getsockopt`]: https://man.dragonflybsd.org/?command=getsockopt&section=2
+//! [illumos `getsockopt`]: https://illumos.org/man/3SOCKET/getsockopt
+//! [glibc `getsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
+//!
+//! # References for all `set_*` functions:
+//!
+//!  - [POSIX `setsockopt`]
+//!  - [Linux `setsockopt`]
+//!  - [Winsock `setsockopt`]
+//!  - [Apple `setsockopt`]
+//!  - [FreeBSD `setsockopt`]
+//!  - [NetBSD `setsockopt`]
+//!  - [OpenBSD `setsockopt`]
+//!  - [DragonFly BSD `setsockopt`]
+//!  - [illumos `setsockopt`]
+//!  - [glibc `setsockopt`]
+//!
+//! [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
+//! [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
+//! [Winsock `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
+//! [Apple `setsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
+//! [FreeBSD `setsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
+//! [NetBSD `setsockopt`]: https://man.netbsd.org/setsockopt.2
+//! [OpenBSD `setsockopt`]: https://man.openbsd.org/setsockopt.2
+//! [DragonFly BSD `setsockopt`]: https://man.dragonflybsd.org/?command=setsockopt&section=2
+//! [illumos `setsockopt`]: https://illumos.org/man/3SOCKET/setsockopt
+//! [glibc `setsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
+//!
+//! # References for `get_socket_*` and `set_socket_*` functions:
+//!
+//!  - [References for all `get_*` functions]
+//!  - [References for all `set_*` functions]
+//!  - [POSIX `sys/socket.h`]
+//!  - [Linux `socket`]
+//!  - [Winsock `SOL_SOCKET` options]
+//!  - [glibc `SOL_SOCKET` Options]
+//!
+//! [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
+//! [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
+//! [Winsock `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
+//! [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+//!
+//! # References for `get_ip_*` and `set_ip_*` functions:
+//!
+//!  - [References for all `get_*` functions]
+//!  - [References for all `set_*` functions]
+//!  - [POSIX `netinet/in.h`]
+//!  - [Linux `ip`]
+//!  - [Winsock `IPPROTO_IP` options]
+//!  - [Apple `ip`]
+//!  - [FreeBSD `ip`]
+//!  - [NetBSD `ip`]
+//!  - [OpenBSD `ip`]
+//!  - [DragonFly BSD `ip`]
+//!  - [illumos `ip`]
+//!
+//! [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
+//! [Linux `ip`]: https://man7.org/linux/man-pages/man7/ip.7.html
+//! [Winsock `IPPROTO_IP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options
+//! [Apple `ip`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip.4.auto.html
+//! [FreeBSD `ip`]: https://man.freebsd.org/cgi/man.cgi?query=ip&sektion=4
+//! [NetBSD `ip`]: https://man.netbsd.org/ip.4
+//! [OpenBSD `ip`]: https://man.openbsd.org/ip.4
+//! [DragonFly BSD `ip`]: https://man.dragonflybsd.org/?command=ip&section=4
+//! [illumos `ip`]: https://illumos.org/man/4P/ip
+//!
+//! # References for `get_ipv6_*` and `set_ipv6_*` functions:
+//!
+//!  - [References for all `get_*` functions]
+//!  - [References for all `set_*` functions]
+//!  - [POSIX `netinet/in.h`]
+//!  - [Linux `ipv6`]
+//!  - [Winsock `IPPROTO_IPV6` options]
+//!  - [Apple `ip6`]
+//!  - [FreeBSD `ip6`]
+//!  - [NetBSD `ip6`]
+//!  - [OpenBSD `ip6`]
+//!  - [DragonFly BSD `ip6`]
+//!  - [illumos `ip6`]
+//!
+//! [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
+//! [Linux `ipv6`]: https://man7.org/linux/man-pages/man7/ipv6.7.html
+//! [Winsock `IPPROTO_IPV6` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options
+//! [Apple `ip6`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip6.4.auto.html
+//! [FreeBSD `ip6`]: https://man.freebsd.org/cgi/man.cgi?query=ip6&sektion=4
+//! [NetBSD `ip6`]: https://man.netbsd.org/ip6.4
+//! [OpenBSD `ip6`]: https://man.openbsd.org/ip6.4
+//! [DragonFly BSD `ip6`]: https://man.dragonflybsd.org/?command=ip6&section=4
+//! [illumos `ip6`]: https://illumos.org/man/4P/ip6
+//!
+//! # References for `get_tcp_*` and `set_tcp_*` functions:
+//!
+//!  - [References for all `get_*` functions]
+//!  - [References for all `set_*` functions]
+//!  - [POSIX `netinet/tcp.h`]
+//!  - [Linux `tcp`]
+//!  - [Winsock `IPPROTO_TCP` options]
+//!  - [Apple `tcp`]
+//!  - [FreeBSD `tcp`]
+//!  - [NetBSD `tcp`]
+//!  - [OpenBSD `tcp`]
+//!  - [DragonFly BSD `tcp`]
+//!  - [illumos `tcp`]
+//!
+//! [POSIX `netinet/tcp.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_tcp.h.html
+//! [Linux `tcp`]: https://man7.org/linux/man-pages/man7/tcp.7.html
+//! [Winsock `IPPROTO_TCP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-tcp-socket-options
+//! [Apple `tcp`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/tcp.4.auto.html
+//! [FreeBSD `tcp`]: https://man.freebsd.org/cgi/man.cgi?query=tcp&sektion=4
+//! [NetBSD `tcp`]: https://man.netbsd.org/tcp.4
+//! [OpenBSD `tcp`]: https://man.openbsd.org/tcp.4
+//! [DragonFly BSD `tcp`]: https://man.dragonflybsd.org/?command=tcp&section=4
+//! [illumos `tcp`]: https://illumos.org/man/4P/tcp
+//!
+//! [References for all `get_*` functions]: #references-for-all-get_-functions
+//! [References for all `set_*` functions]: #references-for-all-set_-functions
+
+#![doc(alias = "getsockopt")]
+#![doc(alias = "setsockopt")]
+
+#[cfg(not(any(
+    apple,
+    windows,
+    target_os = "aix",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "netbsd",
+    target_os = "nto",
+    target_os = "vita",
+)))]
+use crate::net::AddressFamily;
+#[cfg(any(
+    linux_kernel,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "openbsd",
+    target_os = "redox",
+    target_env = "newlib"
+))]
+use crate::net::Protocol;
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+use crate::net::SocketAddrV4;
+#[cfg(linux_kernel)]
+use crate::net::SocketAddrV6;
+use crate::net::{Ipv4Addr, Ipv6Addr, SocketType};
+use crate::{backend, io};
+#[cfg(feature = "alloc")]
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+use alloc::string::String;
+use backend::c;
+use backend::fd::AsFd;
+use core::time::Duration;
+
+/// Timeout identifier for use with [`set_socket_timeout`] and
+/// [`get_socket_timeout`].
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
+#[repr(u32)]
+pub enum Timeout {
+    /// `SO_RCVTIMEO`—Timeout for receiving.
+    Recv = c::SO_RCVTIMEO as _,
+
+    /// `SO_SNDTIMEO`—Timeout for sending.
+    Send = c::SO_SNDTIMEO as _,
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_TYPE)`—Returns the type of a socket.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_TYPE")]
+pub fn get_socket_type<Fd: AsFd>(fd: Fd) -> io::Result<SocketType> {
+    backend::net::sockopt::get_socket_type(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, value)`—Set whether local
+/// addresses may be reused in `bind`.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_REUSEADDR")]
+pub fn set_socket_reuseaddr<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_socket_reuseaddr(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_REUSEADDR)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_REUSEADDR")]
+pub fn get_socket_reuseaddr<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_socket_reuseaddr(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_BROADCAST, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_BROADCAST")]
+pub fn set_socket_broadcast<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_socket_broadcast(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_BROADCAST)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_BROADCAST")]
+pub fn get_socket_broadcast<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_socket_broadcast(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_LINGER, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_LINGER")]
+pub fn set_socket_linger<Fd: AsFd>(fd: Fd, value: Option<Duration>) -> io::Result<()> {
+    backend::net::sockopt::set_socket_linger(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_LINGER)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_LINGER")]
+pub fn get_socket_linger<Fd: AsFd>(fd: Fd) -> io::Result<Option<Duration>> {
+    backend::net::sockopt::get_socket_linger(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_PASSCRED, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(linux_kernel)]
+#[inline]
+#[doc(alias = "SO_PASSCRED")]
+pub fn set_socket_passcred<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_socket_passcred(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_PASSCRED)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(linux_kernel)]
+#[inline]
+#[doc(alias = "SO_PASSCRED")]
+pub fn get_socket_passcred<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_socket_passcred(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, id, value)`—Set the sending or receiving
+/// timeout.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_RCVTIMEO")]
+#[doc(alias = "SO_SNDTIMEO")]
+pub fn set_socket_timeout<Fd: AsFd>(
+    fd: Fd,
+    id: Timeout,
+    value: Option<Duration>,
+) -> io::Result<()> {
+    backend::net::sockopt::set_socket_timeout(fd.as_fd(), id, value)
+}
+
+/// `getsockopt(fd, SOL_SOCKET, id)`—Get the sending or receiving timeout.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_RCVTIMEO")]
+#[doc(alias = "SO_SNDTIMEO")]
+pub fn get_socket_timeout<Fd: AsFd>(fd: Fd, id: Timeout) -> io::Result<Option<Duration>> {
+    backend::net::sockopt::get_socket_timeout(fd.as_fd(), id)
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_ERROR)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_ERROR")]
+pub fn get_socket_error<Fd: AsFd>(fd: Fd) -> io::Result<Result<(), io::Errno>> {
+    backend::net::sockopt::get_socket_error(fd.as_fd())
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(any(apple, freebsdlike, target_os = "netbsd"))]
+#[doc(alias = "SO_NOSIGPIPE")]
+#[inline]
+pub fn get_socket_nosigpipe<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_socket_nosigpipe(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(any(apple, freebsdlike, target_os = "netbsd"))]
+#[doc(alias = "SO_NOSIGPIPE")]
+#[inline]
+pub fn set_socket_nosigpipe<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_socket_nosigpipe(fd.as_fd(), value)
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_KEEPALIVE")]
+pub fn set_socket_keepalive<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_socket_keepalive(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_KEEPALIVE)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_KEEPALIVE")]
+pub fn get_socket_keepalive<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_socket_keepalive(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_RCVBUF, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_RCVBUF")]
+pub fn set_socket_recv_buffer_size<Fd: AsFd>(fd: Fd, value: usize) -> io::Result<()> {
+    backend::net::sockopt::set_socket_recv_buffer_size(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_RCVBUF)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_RCVBUF")]
+pub fn get_socket_recv_buffer_size<Fd: AsFd>(fd: Fd) -> io::Result<usize> {
+    backend::net::sockopt::get_socket_recv_buffer_size(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_SNDBUF, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_SNDBUF")]
+pub fn set_socket_send_buffer_size<Fd: AsFd>(fd: Fd, value: usize) -> io::Result<()> {
+    backend::net::sockopt::set_socket_send_buffer_size(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_SNDBUF)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_SNDBUF")]
+pub fn get_socket_send_buffer_size<Fd: AsFd>(fd: Fd) -> io::Result<usize> {
+    backend::net::sockopt::get_socket_send_buffer_size(fd.as_fd())
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_DOMAIN)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(not(any(
+    apple,
+    windows,
+    target_os = "aix",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "netbsd",
+    target_os = "nto",
+    target_os = "vita",
+)))]
+#[inline]
+#[doc(alias = "SO_DOMAIN")]
+pub fn get_socket_domain<Fd: AsFd>(fd: Fd) -> io::Result<AddressFamily> {
+    backend::net::sockopt::get_socket_domain(fd.as_fd())
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(not(apple))] // Apple platforms declare the constant, but do not actually implement it.
+#[inline]
+#[doc(alias = "SO_ACCEPTCONN")]
+pub fn get_socket_acceptconn<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_socket_acceptconn(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_OOBINLINE")]
+pub fn set_socket_oobinline<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_socket_oobinline(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_OOBINLINE)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_OOBINLINE")]
+pub fn get_socket_oobinline<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_socket_oobinline(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(not(any(solarish, windows)))]
+#[cfg(not(windows))]
+#[inline]
+#[doc(alias = "SO_REUSEPORT")]
+pub fn set_socket_reuseport<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_socket_reuseport(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_REUSEPORT)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(not(any(solarish, windows)))]
+#[inline]
+#[doc(alias = "SO_REUSEPORT")]
+pub fn get_socket_reuseport<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_socket_reuseport(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_REUSEPORT_LB, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(target_os = "freebsd")]
+#[inline]
+#[doc(alias = "SO_REUSEPORT_LB")]
+pub fn set_socket_reuseport_lb<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_socket_reuseport_lb(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_REUSEPORT_LB)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(target_os = "freebsd")]
+#[inline]
+#[doc(alias = "SO_REUSEPORT_LB")]
+pub fn get_socket_reuseport_lb<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_socket_reuseport_lb(fd.as_fd())
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_PROTOCOL)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(any(
+    linux_kernel,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "openbsd",
+    target_os = "redox",
+    target_env = "newlib"
+))]
+#[inline]
+#[doc(alias = "SO_PROTOCOL")]
+pub fn get_socket_protocol<Fd: AsFd>(fd: Fd) -> io::Result<Option<Protocol>> {
+    backend::net::sockopt::get_socket_protocol(fd.as_fd())
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_COOKIE)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(target_os = "linux")]
+#[inline]
+#[doc(alias = "SO_COOKIE")]
+pub fn get_socket_cookie<Fd: AsFd>(fd: Fd) -> io::Result<u64> {
+    backend::net::sockopt::get_socket_cookie(fd.as_fd())
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_INCOMING_CPU)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(target_os = "linux")]
+#[inline]
+#[doc(alias = "SO_INCOMING_CPU")]
+pub fn get_socket_incoming_cpu<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
+    backend::net::sockopt::get_socket_incoming_cpu(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_INCOMING_CPU, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(target_os = "linux")]
+#[inline]
+#[doc(alias = "SO_INCOMING_CPU")]
+pub fn set_socket_incoming_cpu<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_socket_incoming_cpu(fd.as_fd(), value)
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_TTL, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "IP_TTL")]
+pub fn set_ip_ttl<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_ip_ttl(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IP, IP_TTL)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[inline]
+#[doc(alias = "IP_TTL")]
+pub fn get_ip_ttl<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
+    backend::net::sockopt::get_ip_ttl(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[inline]
+#[doc(alias = "IPV6_V6ONLY")]
+pub fn set_ipv6_v6only<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_v6only(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[inline]
+#[doc(alias = "IPV6_V6ONLY")]
+pub fn get_ipv6_v6only<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_ipv6_v6only(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[inline]
+#[doc(alias = "IP_MULTICAST_LOOP")]
+pub fn set_ip_multicast_loop<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_ip_multicast_loop(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[inline]
+#[doc(alias = "IP_MULTICAST_LOOP")]
+pub fn get_ip_multicast_loop<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_ip_multicast_loop(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[inline]
+#[doc(alias = "IP_MULTICAST_TTL")]
+pub fn set_ip_multicast_ttl<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_ip_multicast_ttl(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[inline]
+#[doc(alias = "IP_MULTICAST_TTL")]
+pub fn get_ip_multicast_ttl<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
+    backend::net::sockopt::get_ip_multicast_ttl(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[inline]
+#[doc(alias = "IPV6_MULTICAST_LOOP")]
+pub fn set_ipv6_multicast_loop<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_multicast_loop(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[inline]
+#[doc(alias = "IPV6_MULTICAST_LOOP")]
+pub fn get_ipv6_multicast_loop<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_ipv6_multicast_loop(fd.as_fd())
+}
+
+/// `getsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[inline]
+#[doc(alias = "IPV6_UNICAST_HOPS")]
+pub fn get_ipv6_unicast_hops<Fd: AsFd>(fd: Fd) -> io::Result<u8> {
+    backend::net::sockopt::get_ipv6_unicast_hops(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[inline]
+#[doc(alias = "IPV6_UNICAST_HOPS")]
+pub fn set_ipv6_unicast_hops<Fd: AsFd>(fd: Fd, value: Option<u8>) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_unicast_hops(fd.as_fd(), value)
+}
+
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[inline]
+#[doc(alias = "IPV6_MULTICAST_HOPS")]
+pub fn set_ipv6_multicast_hops<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_multicast_hops(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[inline]
+#[doc(alias = "IPV6_MULTICAST_HOPS")]
+pub fn get_ipv6_multicast_hops<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
+    backend::net::sockopt::get_ipv6_multicast_hops(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, multiaddr, interface)`
+///
+/// This is similar to [`set_ip_add_membership`] but always sets `ifindex`
+/// value to zero.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[inline]
+#[doc(alias = "IP_ADD_MEMBERSHIP")]
+pub fn set_ip_add_membership<Fd: AsFd>(
+    fd: Fd,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+) -> io::Result<()> {
+    backend::net::sockopt::set_ip_add_membership(fd.as_fd(), multiaddr, interface)
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, multiaddr, address,
+/// ifindex)`
+///
+/// This is similar to [`set_ip_add_membership_with_ifindex`] but additionally
+/// allows a `ifindex` value to be given.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(
+    apple,
+    freebsdlike,
+    linux_like,
+    target_os = "fuchsia",
+    target_os = "openbsd"
+))]
+#[inline]
+#[doc(alias = "IP_ADD_MEMBERSHIP")]
+pub fn set_ip_add_membership_with_ifindex<Fd: AsFd>(
+    fd: Fd,
+    multiaddr: &Ipv4Addr,
+    address: &Ipv4Addr,
+    ifindex: i32,
+) -> io::Result<()> {
+    backend::net::sockopt::set_ip_add_membership_with_ifindex(
+        fd.as_fd(),
+        multiaddr,
+        address,
+        ifindex,
+    )
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_ADD_SOURCE_MEMBERSHIP, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(apple, freebsdlike, linux_like, solarish, target_os = "aix"))]
+#[inline]
+#[doc(alias = "IP_ADD_SOURCE_MEMBERSHIP")]
+pub fn set_ip_add_source_membership<Fd: AsFd>(
+    fd: Fd,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+    sourceaddr: &Ipv4Addr,
+) -> io::Result<()> {
+    backend::net::sockopt::set_ip_add_source_membership(
+        fd.as_fd(),
+        multiaddr,
+        interface,
+        sourceaddr,
+    )
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_DROP_SOURCE_MEMBERSHIP, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(apple, freebsdlike, linux_like, solarish, target_os = "aix"))]
+#[inline]
+#[doc(alias = "IP_DROP_SOURCE_MEMBERSHIP")]
+pub fn set_ip_drop_source_membership<Fd: AsFd>(
+    fd: Fd,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+    sourceaddr: &Ipv4Addr,
+) -> io::Result<()> {
+    backend::net::sockopt::set_ip_drop_source_membership(
+        fd.as_fd(),
+        multiaddr,
+        interface,
+        sourceaddr,
+    )
+}
+
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, multiaddr, interface)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[inline]
+#[doc(alias = "IPV6_JOIN_GROUP")]
+#[doc(alias = "IPV6_ADD_MEMBERSHIP")]
+pub fn set_ipv6_add_membership<Fd: AsFd>(
+    fd: Fd,
+    multiaddr: &Ipv6Addr,
+    interface: u32,
+) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_add_membership(fd.as_fd(), multiaddr, interface)
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, multiaddr, interface)`
+///
+/// This is similar to [`set_ip_drop_membership`] but always sets `ifindex`
+/// value to zero.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[inline]
+#[doc(alias = "IP_DROP_MEMBERSHIP")]
+pub fn set_ip_drop_membership<Fd: AsFd>(
+    fd: Fd,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+) -> io::Result<()> {
+    backend::net::sockopt::set_ip_drop_membership(fd.as_fd(), multiaddr, interface)
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, multiaddr, interface)`
+///
+/// This is similar to [`set_ip_drop_membership_with_ifindex`] but additionally
+/// allows a `ifindex` value to be given.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(
+    apple,
+    freebsdlike,
+    linux_like,
+    target_os = "fuchsia",
+    target_os = "openbsd"
+))]
+#[inline]
+#[doc(alias = "IP_DROP_MEMBERSHIP")]
+pub fn set_ip_drop_membership_with_ifindex<Fd: AsFd>(
+    fd: Fd,
+    multiaddr: &Ipv4Addr,
+    address: &Ipv4Addr,
+    ifindex: i32,
+) -> io::Result<()> {
+    backend::net::sockopt::set_ip_drop_membership_with_ifindex(
+        fd.as_fd(),
+        multiaddr,
+        address,
+        ifindex,
+    )
+}
+
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, multiaddr, interface)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[inline]
+#[doc(alias = "IPV6_LEAVE_GROUP")]
+#[doc(alias = "IPV6_DROP_MEMBERSHIP")]
+pub fn set_ipv6_drop_membership<Fd: AsFd>(
+    fd: Fd,
+    multiaddr: &Ipv6Addr,
+    interface: u32,
+) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_drop_membership(fd.as_fd(), multiaddr, interface)
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_TOS, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "haiku",
+    target_os = "nto",
+    target_env = "newlib"
+))]
+#[inline]
+#[doc(alias = "IP_TOS")]
+pub fn set_ip_tos<Fd: AsFd>(fd: Fd, value: u8) -> io::Result<()> {
+    backend::net::sockopt::set_ip_tos(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IP, IP_TOS)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "haiku",
+    target_os = "nto",
+    target_env = "newlib"
+))]
+#[inline]
+#[doc(alias = "IP_TOS")]
+pub fn get_ip_tos<Fd: AsFd>(fd: Fd) -> io::Result<u8> {
+    backend::net::sockopt::get_ip_tos(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_RECVTOS, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(apple, linux_like, target_os = "freebsd", target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "IP_RECVTOS")]
+pub fn set_ip_recvtos<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_ip_recvtos(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IP, IP_RECVTOS)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(apple, linux_like, target_os = "freebsd", target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "IP_RECVTOS")]
+pub fn get_ip_recvtos<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_ip_recvtos(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_RECVTCLASS, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "nto"
+))]
+#[inline]
+#[doc(alias = "IPV6_RECVTCLASS")]
+pub fn set_ipv6_recvtclass<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_recvtclass(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IPV6, IPV6_RECVTCLASS)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "nto"
+))]
+#[inline]
+#[doc(alias = "IPV6_RECVTCLASS")]
+pub fn get_ipv6_recvtclass<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_ipv6_recvtclass(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_FREEBIND, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "IP_FREEBIND")]
+pub fn set_ip_freebind<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_ip_freebind(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IP, IP_FREEBIND)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "IP_FREEBIND")]
+pub fn get_ip_freebind<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_ip_freebind(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_FREEBIND, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(linux_kernel)]
+#[inline]
+#[doc(alias = "IPV6_FREEBIND")]
+pub fn set_ipv6_freebind<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_freebind(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IPV6, IPV6_FREEBIND)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(linux_kernel)]
+#[inline]
+#[doc(alias = "IPV6_FREEBIND")]
+pub fn get_ipv6_freebind<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_ipv6_freebind(fd.as_fd())
+}
+
+/// `getsockopt(fd, IPPROTO_IP, SO_ORIGINAL_DST)`
+///
+/// Even though this corresponnds to a `SO_*` constant, it is an `IPPROTO_IP`
+/// option.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "SO_ORIGINAL_DST")]
+pub fn get_ip_original_dst<Fd: AsFd>(fd: Fd) -> io::Result<SocketAddrV4> {
+    backend::net::sockopt::get_ip_original_dst(fd.as_fd())
+}
+
+/// `getsockopt(fd, IPPROTO_IPV6, IP6T_SO_ORIGINAL_DST)`
+///
+/// Even though this corresponnds to a `IP6T_*` constant, it is an
+/// `IPPROTO_IPV6` option.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(linux_kernel)]
+#[inline]
+#[doc(alias = "IP6T_SO_ORIGINAL_DST")]
+pub fn get_ipv6_original_dst<Fd: AsFd>(fd: Fd) -> io::Result<SocketAddrV6> {
+    backend::net::sockopt::get_ipv6_original_dst(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(not(any(
+    solarish,
+    windows,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "vita"
+)))]
+#[inline]
+#[doc(alias = "IPV6_TCLASS")]
+pub fn set_ipv6_tclass<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_tclass(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(not(any(
+    solarish,
+    windows,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "vita"
+)))]
+#[inline]
+#[doc(alias = "IPV6_TCLASS")]
+pub fn get_ipv6_tclass<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
+    backend::net::sockopt::get_ipv6_tclass(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[inline]
+#[doc(alias = "TCP_NODELAY")]
+pub fn set_tcp_nodelay<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_nodelay(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_TCP, TCP_NODELAY)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[inline]
+#[doc(alias = "TCP_NODELAY")]
+pub fn get_tcp_nodelay<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_tcp_nodelay(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+#[inline]
+#[doc(alias = "TCP_KEEPCNT")]
+pub fn set_tcp_keepcnt<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_keepcnt(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+#[inline]
+#[doc(alias = "TCP_KEEPCNT")]
+pub fn get_tcp_keepcnt<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
+    backend::net::sockopt::get_tcp_keepcnt(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, value)`
+///
+/// `TCP_KEEPALIVE` on Apple platforms.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+#[inline]
+#[doc(alias = "TCP_KEEPIDLE")]
+pub fn set_tcp_keepidle<Fd: AsFd>(fd: Fd, value: Duration) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_keepidle(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE)`
+///
+/// `TCP_KEEPALIVE` on Apple platforms.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+#[inline]
+#[doc(alias = "TCP_KEEPIDLE")]
+pub fn get_tcp_keepidle<Fd: AsFd>(fd: Fd) -> io::Result<Duration> {
+    backend::net::sockopt::get_tcp_keepidle(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+#[inline]
+#[doc(alias = "TCP_KEEPINTVL")]
+pub fn set_tcp_keepintvl<Fd: AsFd>(fd: Fd, value: Duration) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_keepintvl(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+#[inline]
+#[doc(alias = "TCP_KEEPINTVL")]
+pub fn get_tcp_keepintvl<Fd: AsFd>(fd: Fd) -> io::Result<Duration> {
+    backend::net::sockopt::get_tcp_keepintvl(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_TCP, TCP_USER_TIMEOUT, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_USER_TIMEOUT")]
+pub fn set_tcp_user_timeout<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_user_timeout(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_TCP, TCP_USER_TIMEOUT)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_USER_TIMEOUT")]
+pub fn get_tcp_user_timeout<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
+    backend::net::sockopt::get_tcp_user_timeout(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_TCP, TCP_QUICKACK, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_QUICKACK")]
+pub fn set_tcp_quickack<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_quickack(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_TCP, TCP_QUICKACK)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_QUICKACK")]
+pub fn get_tcp_quickack<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_tcp_quickack(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_TCP, TCP_CONGESTION, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+#[inline]
+#[doc(alias = "TCP_CONGESTION")]
+pub fn set_tcp_congestion<Fd: AsFd>(fd: Fd, value: &str) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_congestion(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_TCP, TCP_CONGESTION)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(feature = "alloc")]
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+#[inline]
+#[doc(alias = "TCP_CONGESTION")]
+pub fn get_tcp_congestion<Fd: AsFd>(fd: Fd) -> io::Result<String> {
+    backend::net::sockopt::get_tcp_congestion(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_TCP, TCP_THIN_LINEAR_TIMEOUTS, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_THIN_LINEAR_TIMEOUTS")]
+pub fn set_tcp_thin_linear_timeouts<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_thin_linear_timeouts(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_TCP, TCP_THIN_LINEAR_TIMEOUTS)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_THIN_LINEAR_TIMEOUTS")]
+pub fn get_tcp_thin_linear_timeouts<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_tcp_thin_linear_timeouts(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_TCP, TCP_CORK, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, solarish, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_CORK")]
+pub fn set_tcp_cork<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_cork(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_TCP, TCP_CORK)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, solarish, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_CORK")]
+pub fn get_tcp_cork<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_tcp_cork(fd.as_fd())
+}
+
+/// Get credentials of Unix domain socket peer process
+///
+/// # References
+///  - [Linux `unix`]
+///
+/// [Linux `unix`]: https://man7.org/linux/man-pages/man7/unix.7.html
+#[cfg(linux_kernel)]
+#[doc(alias = "SO_PEERCRED")]
+pub fn get_socket_peercred<Fd: AsFd>(fd: Fd) -> io::Result<super::UCred> {
+    backend::net::sockopt::get_socket_peercred(fd.as_fd())
+}
+
+#[test]
+fn test_sizes() {
+    use c::c_int;
+
+    // Backend code needs to cast these to `c_int` so make sure that cast
+    // isn't lossy.
+    assert_eq_size!(Timeout, c_int);
+}
diff --git a/vendor/rustix/src/net/types.rs b/vendor/rustix/src/net/types.rs
new file mode 100644
index 0000000..ad60e36
--- /dev/null
+++ b/vendor/rustix/src/net/types.rs
@@ -0,0 +1,1495 @@
+//! Types and constants for `rustix::net`.
+
+use crate::backend::c;
+use bitflags::bitflags;
+
+/// A type for holding raw integer socket types.
+pub type RawSocketType = u32;
+
+/// `SOCK_*` constants for use with [`socket`].
+///
+/// [`socket`]: crate::net::socket()
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
+#[repr(transparent)]
+pub struct SocketType(pub(crate) RawSocketType);
+
+#[rustfmt::skip]
+impl SocketType {
+    /// `SOCK_STREAM`
+    pub const STREAM: Self = Self(c::SOCK_STREAM as _);
+
+    /// `SOCK_DGRAM`
+    pub const DGRAM: Self = Self(c::SOCK_DGRAM as _);
+
+    /// `SOCK_SEQPACKET`
+    #[cfg(not(target_os = "espidf"))]
+    pub const SEQPACKET: Self = Self(c::SOCK_SEQPACKET as _);
+
+    /// `SOCK_RAW`
+    #[cfg(not(target_os = "espidf"))]
+    pub const RAW: Self = Self(c::SOCK_RAW as _);
+
+    /// `SOCK_RDM`
+    #[cfg(not(any(target_os = "espidf", target_os = "haiku")))]
+    pub const RDM: Self = Self(c::SOCK_RDM as _);
+
+    /// Constructs a `SocketType` from a raw integer.
+    #[inline]
+    pub const fn from_raw(raw: RawSocketType) -> Self {
+        Self(raw)
+    }
+
+    /// Returns the raw integer for this `SocketType`.
+    #[inline]
+    pub const fn as_raw(self) -> RawSocketType {
+        self.0
+    }
+}
+
+/// A type for holding raw integer address families.
+pub type RawAddressFamily = c::sa_family_t;
+
+/// `AF_*` constants for use with [`socket`], [`socket_with`], and
+/// [`socketpair`].
+///
+/// [`socket`]: crate::net::socket()
+/// [`socket_with`]: crate::net::socket_with
+/// [`socketpair`]: crate::net::socketpair()
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
+#[repr(transparent)]
+pub struct AddressFamily(pub(crate) RawAddressFamily);
+
+#[rustfmt::skip]
+#[allow(non_upper_case_globals)]
+impl AddressFamily {
+    /// `AF_UNSPEC`
+    pub const UNSPEC: Self = Self(c::AF_UNSPEC as _);
+    /// `AF_INET`
+    ///
+    /// # References
+    ///  - [Linux]
+    ///
+    /// [Linux]: https://man7.org/linux/man-pages/man7/ip.7.html
+    pub const INET: Self = Self(c::AF_INET as _);
+    /// `AF_INET6`
+    ///
+    /// # References
+    ///  - [Linux]
+    ///
+    /// [Linux]: https://man7.org/linux/man-pages/man7/ipv6.7.html
+    pub const INET6: Self = Self(c::AF_INET6 as _);
+    /// `AF_NETLINK`
+    ///
+    /// # References
+    ///  - [Linux]
+    ///
+    /// [Linux]: https://man7.org/linux/man-pages/man7/netlink.7.html
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const NETLINK: Self = Self(c::AF_NETLINK as _);
+    /// `AF_UNIX`, aka `AF_LOCAL`
+    #[doc(alias = "LOCAL")]
+    pub const UNIX: Self = Self(c::AF_UNIX as _);
+    /// `AF_AX25`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const AX25: Self = Self(c::AF_AX25 as _);
+    /// `AF_IPX`
+    #[cfg(not(any(
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "vita",
+    )))]
+    pub const IPX: Self = Self(c::AF_IPX as _);
+    /// `AF_APPLETALK`
+    #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+    pub const APPLETALK: Self = Self(c::AF_APPLETALK as _);
+    /// `AF_NETROM`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const NETROM: Self = Self(c::AF_NETROM as _);
+    /// `AF_BRIDGE`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const BRIDGE: Self = Self(c::AF_BRIDGE as _);
+    /// `AF_ATMPVC`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const ATMPVC: Self = Self(c::AF_ATMPVC as _);
+    /// `AF_X25`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const X25: Self = Self(c::AF_X25 as _);
+    /// `AF_ROSE`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const ROSE: Self = Self(c::AF_ROSE as _);
+    /// `AF_DECnet`
+    #[cfg(not(any(target_os = "espidf", target_os = "haiku", target_os = "vita")))]
+    pub const DECnet: Self = Self(c::AF_DECnet as _);
+    /// `AF_NETBEUI`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const NETBEUI: Self = Self(c::AF_NETBEUI as _);
+    /// `AF_SECURITY`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const SECURITY: Self = Self(c::AF_SECURITY as _);
+    /// `AF_KEY`
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const KEY: Self = Self(c::AF_KEY as _);
+    /// `AF_PACKET`
+    ///
+    /// # References
+    ///  - [Linux]
+    ///
+    /// [Linux]: https://man7.org/linux/man-pages/man7/packet.7.html
+    #[cfg(not(any(
+        bsd,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const PACKET: Self = Self(c::AF_PACKET as _);
+    /// `AF_ASH`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const ASH: Self = Self(c::AF_ASH as _);
+    /// `AF_ECONET`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const ECONET: Self = Self(c::AF_ECONET as _);
+    /// `AF_ATMSVC`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const ATMSVC: Self = Self(c::AF_ATMSVC as _);
+    /// `AF_RDS`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const RDS: Self = Self(c::AF_RDS as _);
+    /// `AF_SNA`
+    #[cfg(not(any(target_os = "espidf", target_os = "haiku", target_os = "vita")))]
+    pub const SNA: Self = Self(c::AF_SNA as _);
+    /// `AF_IRDA`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const IRDA: Self = Self(c::AF_IRDA as _);
+    /// `AF_PPPOX`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const PPPOX: Self = Self(c::AF_PPPOX as _);
+    /// `AF_WANPIPE`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const WANPIPE: Self = Self(c::AF_WANPIPE as _);
+    /// `AF_LLC`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const LLC: Self = Self(c::AF_LLC as _);
+    /// `AF_CAN`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const CAN: Self = Self(c::AF_CAN as _);
+    /// `AF_TIPC`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const TIPC: Self = Self(c::AF_TIPC as _);
+    /// `AF_BLUETOOTH`
+    #[cfg(not(any(
+        apple,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "vita",
+    )))]
+    pub const BLUETOOTH: Self = Self(c::AF_BLUETOOTH as _);
+    /// `AF_IUCV`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const IUCV: Self = Self(c::AF_IUCV as _);
+    /// `AF_RXRPC`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const RXRPC: Self = Self(c::AF_RXRPC as _);
+    /// `AF_ISDN`
+    #[cfg(not(any(
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita",
+    )))]
+    pub const ISDN: Self = Self(c::AF_ISDN as _);
+    /// `AF_PHONET`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const PHONET: Self = Self(c::AF_PHONET as _);
+    /// `AF_IEEE802154`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const IEEE802154: Self = Self(c::AF_IEEE802154 as _);
+    /// `AF_802`
+    #[cfg(solarish)]
+    pub const EIGHT_ZERO_TWO: Self = Self(c::AF_802 as _);
+    #[cfg(target_os = "fuchsia")]
+    /// `AF_ALG`
+    pub const ALG: Self = Self(c::AF_ALG as _);
+    #[cfg(any(target_os = "freebsd", target_os = "netbsd", target_os = "nto"))]
+    /// `AF_ARP`
+    pub const ARP: Self = Self(c::AF_ARP as _);
+    /// `AF_ATM`
+    #[cfg(freebsdlike)]
+    pub const ATM: Self = Self(c::AF_ATM as _);
+    /// `AF_CAIF`
+    #[cfg(any(target_os = "android", target_os = "emscripten", target_os = "fuchsia"))]
+    pub const CAIF: Self = Self(c::AF_CAIF as _);
+    /// `AF_CCITT`
+    #[cfg(any(bsd, solarish, target_os = "aix", target_os = "nto"))]
+    pub const CCITT: Self = Self(c::AF_CCITT as _);
+    /// `AF_CHAOS`
+    #[cfg(any(bsd, solarish, target_os = "aix", target_os = "nto"))]
+    pub const CHAOS: Self = Self(c::AF_CHAOS as _);
+    /// `AF_CNT`
+    #[cfg(any(bsd, target_os = "nto"))]
+    pub const CNT: Self = Self(c::AF_CNT as _);
+    /// `AF_COIP`
+    #[cfg(any(bsd, target_os = "nto"))]
+    pub const COIP: Self = Self(c::AF_COIP as _);
+    /// `AF_DATAKIT`
+    #[cfg(any(bsd, solarish, target_os = "aix", target_os = "nto"))]
+    pub const DATAKIT: Self = Self(c::AF_DATAKIT as _);
+    /// `AF_DLI`
+    #[cfg(any(bsd, solarish, target_os = "aix", target_os = "haiku", target_os = "nto"))]
+    pub const DLI: Self = Self(c::AF_DLI as _);
+    /// `AF_E164`
+    #[cfg(any(bsd, target_os = "nto"))]
+    pub const E164: Self = Self(c::AF_E164 as _);
+    /// `AF_ECMA`
+    #[cfg(any(apple, freebsdlike, solarish, target_os = "aix", target_os = "nto", target_os = "openbsd"))]
+    pub const ECMA: Self = Self(c::AF_ECMA as _);
+    /// `AF_ENCAP`
+    #[cfg(target_os = "openbsd")]
+    pub const ENCAP: Self = Self(c::AF_ENCAP as _);
+    /// `AF_FILE`
+    #[cfg(solarish)]
+    pub const FILE: Self = Self(c::AF_FILE as _);
+    /// `AF_GOSIP`
+    #[cfg(solarish)]
+    pub const GOSIP: Self = Self(c::AF_GOSIP as _);
+    /// `AF_HYLINK`
+    #[cfg(any(bsd, solarish, target_os = "aix", target_os = "nto"))]
+    pub const HYLINK: Self = Self(c::AF_HYLINK as _);
+    /// `AF_IB`
+    #[cfg(any(target_os = "emscripten", target_os = "fuchsia"))]
+    pub const IB: Self = Self(c::AF_IB as _);
+    /// `AF_IMPLINK`
+    #[cfg(any(bsd, solarish, target_os = "aix", target_os = "nto"))]
+    pub const IMPLINK: Self = Self(c::AF_IMPLINK as _);
+    /// `AF_IEEE80211`
+    #[cfg(any(apple, freebsdlike, target_os = "netbsd"))]
+    pub const IEEE80211: Self = Self(c::AF_IEEE80211 as _);
+    /// `AF_INET6_SDP`
+    #[cfg(target_os = "freebsd")]
+    pub const INET6_SDP: Self = Self(c::AF_INET6_SDP as _);
+    /// `AF_INET_OFFLOAD`
+    #[cfg(solarish)]
+    pub const INET_OFFLOAD: Self = Self(c::AF_INET_OFFLOAD as _);
+    /// `AF_INET_SDP`
+    #[cfg(target_os = "freebsd")]
+    pub const INET_SDP: Self = Self(c::AF_INET_SDP as _);
+    /// `AF_INTF`
+    #[cfg(target_os = "aix")]
+    pub const INTF: Self = Self(c::AF_INTF as _);
+    /// `AF_ISO`
+    #[cfg(any(bsd, target_os = "aix", target_os = "nto"))]
+    pub const ISO: Self = Self(c::AF_ISO as _);
+    /// `AF_LAT`
+    #[cfg(any(bsd, solarish, target_os = "aix", target_os = "nto"))]
+    pub const LAT: Self = Self(c::AF_LAT as _);
+    /// `AF_LINK`
+    #[cfg(any(bsd, solarish, target_os = "aix", target_os = "haiku", target_os = "nto"))]
+    pub const LINK: Self = Self(c::AF_LINK as _);
+    /// `AF_MPLS`
+    #[cfg(any(netbsdlike, target_os = "dragonfly", target_os = "emscripten", target_os = "fuchsia"))]
+    pub const MPLS: Self = Self(c::AF_MPLS as _);
+    /// `AF_NATM`
+    #[cfg(any(bsd, target_os = "nto"))]
+    pub const NATM: Self = Self(c::AF_NATM as _);
+    /// `AF_NBS`
+    #[cfg(solarish)]
+    pub const NBS: Self = Self(c::AF_NBS as _);
+    /// `AF_NCA`
+    #[cfg(solarish)]
+    pub const NCA: Self = Self(c::AF_NCA as _);
+    /// `AF_NDD`
+    #[cfg(target_os = "aix")]
+    pub const NDD: Self = Self(c::AF_NDD as _);
+    /// `AF_NDRV`
+    #[cfg(apple)]
+    pub const NDRV: Self = Self(c::AF_NDRV as _);
+    /// `AF_NETBIOS`
+    #[cfg(any(apple, freebsdlike))]
+    pub const NETBIOS: Self = Self(c::AF_NETBIOS as _);
+    /// `AF_NETGRAPH`
+    #[cfg(freebsdlike)]
+    pub const NETGRAPH: Self = Self(c::AF_NETGRAPH as _);
+    /// `AF_NIT`
+    #[cfg(solarish)]
+    pub const NIT: Self = Self(c::AF_NIT as _);
+    /// `AF_NOTIFY`
+    #[cfg(target_os = "haiku")]
+    pub const NOTIFY: Self = Self(c::AF_NOTIFY as _);
+    /// `AF_NFC`
+    #[cfg(any(target_os = "emscripten", target_os = "fuchsia"))]
+    pub const NFC: Self = Self(c::AF_NFC as _);
+    /// `AF_NS`
+    #[cfg(any(apple, solarish, netbsdlike, target_os = "aix", target_os = "nto"))]
+    pub const NS: Self = Self(c::AF_NS as _);
+    /// `AF_OROUTE`
+    #[cfg(target_os = "netbsd")]
+    pub const OROUTE: Self = Self(c::AF_OROUTE as _);
+    /// `AF_OSI`
+    #[cfg(any(bsd, solarish, target_os = "aix", target_os = "nto"))]
+    pub const OSI: Self = Self(c::AF_OSI as _);
+    /// `AF_OSINET`
+    #[cfg(solarish)]
+    pub const OSINET: Self = Self(c::AF_OSINET as _);
+    /// `AF_POLICY`
+    #[cfg(solarish)]
+    pub const POLICY: Self = Self(c::AF_POLICY as _);
+    /// `AF_PPP`
+    #[cfg(apple)]
+    pub const PPP: Self = Self(c::AF_PPP as _);
+    /// `AF_PUP`
+    #[cfg(any(bsd, solarish, target_os = "aix", target_os = "nto"))]
+    pub const PUP: Self = Self(c::AF_PUP as _);
+    /// `AF_RIF`
+    #[cfg(target_os = "aix")]
+    pub const RIF: Self = Self(c::AF_RIF as _);
+    /// `AF_ROUTE`
+    #[cfg(any(bsd, solarish, target_os = "android", target_os = "emscripten", target_os = "fuchsia", target_os = "haiku", target_os = "nto"))]
+    pub const ROUTE: Self = Self(c::AF_ROUTE as _);
+    /// `AF_SCLUSTER`
+    #[cfg(target_os = "freebsd")]
+    pub const SCLUSTER: Self = Self(c::AF_SCLUSTER as _);
+    /// `AF_SIP`
+    #[cfg(any(apple, target_os = "freebsd", target_os = "openbsd"))]
+    pub const SIP: Self = Self(c::AF_SIP as _);
+    /// `AF_SLOW`
+    #[cfg(target_os = "freebsd")]
+    pub const SLOW: Self = Self(c::AF_SLOW as _);
+    /// `AF_SYS_CONTROL`
+    #[cfg(apple)]
+    pub const SYS_CONTROL: Self = Self(c::AF_SYS_CONTROL as _);
+    /// `AF_SYSTEM`
+    #[cfg(apple)]
+    pub const SYSTEM: Self = Self(c::AF_SYSTEM as _);
+    /// `AF_TRILL`
+    #[cfg(solarish)]
+    pub const TRILL: Self = Self(c::AF_TRILL as _);
+    /// `AF_UTUN`
+    #[cfg(apple)]
+    pub const UTUN: Self = Self(c::AF_UTUN as _);
+    /// `AF_VSOCK`
+    #[cfg(any(apple, target_os = "emscripten", target_os = "fuchsia"))]
+    pub const VSOCK: Self = Self(c::AF_VSOCK as _);
+
+    /// Constructs a `AddressFamily` from a raw integer.
+    #[inline]
+    pub const fn from_raw(raw: RawAddressFamily) -> Self {
+        Self(raw)
+    }
+
+    /// Returns the raw integer for this `AddressFamily`.
+    #[inline]
+    pub const fn as_raw(self) -> RawAddressFamily {
+        self.0
+    }
+}
+
+/// A type for holding raw integer protocols.
+pub type RawProtocol = core::num::NonZeroU32;
+
+const fn new_raw_protocol(u: u32) -> RawProtocol {
+    match RawProtocol::new(u) {
+        Some(p) => p,
+        None => panic!("new_raw_protocol: protocol must be non-zero"),
+    }
+}
+
+/// `IPPROTO_*` and other constants for use with [`socket`], [`socket_with`],
+/// and [`socketpair`] when a nondefault value is desired. See the [`ipproto`],
+/// [`sysproto`], and [`netlink`] modules for possible values.
+///
+/// For the default values, such as `IPPROTO_IP` or `NETLINK_ROUTE`, pass
+/// `None` as the `protocol` argument in these functions.
+///
+/// [`socket`]: crate::net::socket()
+/// [`socket_with`]: crate::net::socket_with
+/// [`socketpair`]: crate::net::socketpair()
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
+#[repr(transparent)]
+#[doc(alias = "IPPROTO_IP")]
+#[doc(alias = "NETLINK_ROUTE")]
+pub struct Protocol(pub(crate) RawProtocol);
+
+/// `IPPROTO_*` constants.
+///
+/// For `IPPROTO_IP`, pass `None` as the `protocol` argument.
+pub mod ipproto {
+    use super::{new_raw_protocol, Protocol};
+    use crate::backend::c;
+
+    /// `IPPROTO_ICMP`
+    pub const ICMP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_ICMP as _));
+    /// `IPPROTO_IGMP`
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
+    pub const IGMP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_IGMP as _));
+    /// `IPPROTO_IPIP`
+    #[cfg(not(any(
+        solarish,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
+    pub const IPIP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_IPIP as _));
+    /// `IPPROTO_TCP`
+    pub const TCP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_TCP as _));
+    /// `IPPROTO_EGP`
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
+    pub const EGP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_EGP as _));
+    /// `IPPROTO_PUP`
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
+    pub const PUP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_PUP as _));
+    /// `IPPROTO_UDP`
+    pub const UDP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_UDP as _));
+    /// `IPPROTO_IDP`
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
+    pub const IDP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_IDP as _));
+    /// `IPPROTO_TP`
+    #[cfg(not(any(
+        solarish,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
+    pub const TP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_TP as _));
+    /// `IPPROTO_DCCP`
+    #[cfg(not(any(
+        apple,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "openbsd",
+        target_os = "vita",
+    )))]
+    pub const DCCP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_DCCP as _));
+    /// `IPPROTO_IPV6`
+    pub const IPV6: Protocol = Protocol(new_raw_protocol(c::IPPROTO_IPV6 as _));
+    /// `IPPROTO_RSVP`
+    #[cfg(not(any(
+        solarish,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
+    pub const RSVP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_RSVP as _));
+    /// `IPPROTO_GRE`
+    #[cfg(not(any(
+        solarish,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
+    pub const GRE: Protocol = Protocol(new_raw_protocol(c::IPPROTO_GRE as _));
+    /// `IPPROTO_ESP`
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
+    pub const ESP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_ESP as _));
+    /// `IPPROTO_AH`
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
+    pub const AH: Protocol = Protocol(new_raw_protocol(c::IPPROTO_AH as _));
+    /// `IPPROTO_MTP`
+    #[cfg(not(any(
+        solarish,
+        netbsdlike,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const MTP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_MTP as _));
+    /// `IPPROTO_BEETPH`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const BEETPH: Protocol = Protocol(new_raw_protocol(c::IPPROTO_BEETPH as _));
+    /// `IPPROTO_ENCAP`
+    #[cfg(not(any(
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita",
+    )))]
+    pub const ENCAP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_ENCAP as _));
+    /// `IPPROTO_PIM`
+    #[cfg(not(any(
+        solarish,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
+    pub const PIM: Protocol = Protocol(new_raw_protocol(c::IPPROTO_PIM as _));
+    /// `IPPROTO_COMP`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const COMP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_COMP as _));
+    /// `IPPROTO_SCTP`
+    #[cfg(not(any(
+        solarish,
+        target_os = "dragonfly",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "openbsd",
+        target_os = "vita",
+    )))]
+    pub const SCTP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_SCTP as _));
+    /// `IPPROTO_UDPLITE`
+    #[cfg(not(any(
+        apple,
+        netbsdlike,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const UDPLITE: Protocol = Protocol(new_raw_protocol(c::IPPROTO_UDPLITE as _));
+    /// `IPPROTO_MPLS`
+    #[cfg(not(any(
+        apple,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "netbsd",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const MPLS: Protocol = Protocol(new_raw_protocol(c::IPPROTO_MPLS as _));
+    /// `IPPROTO_ETHERNET`
+    #[cfg(linux_kernel)]
+    pub const ETHERNET: Protocol = Protocol(new_raw_protocol(c::IPPROTO_ETHERNET as _));
+    /// `IPPROTO_RAW`
+    #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
+    pub const RAW: Protocol = Protocol(new_raw_protocol(c::IPPROTO_RAW as _));
+    /// `IPPROTO_MPTCP`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        windows,
+        target_os = "aix",
+        target_os = "emscripten",
+        target_os = "espidf",
+        target_os = "fuchsia",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const MPTCP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_MPTCP as _));
+    /// `IPPROTO_FRAGMENT`
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
+    pub const FRAGMENT: Protocol = Protocol(new_raw_protocol(c::IPPROTO_FRAGMENT as _));
+    /// `IPPROTO_ICMPV6`
+    pub const ICMPV6: Protocol = Protocol(new_raw_protocol(c::IPPROTO_ICMPV6 as _));
+    /// `IPPROTO_MH`
+    #[cfg(not(any(
+        apple,
+        netbsdlike,
+        solarish,
+        windows,
+        target_os = "dragonfly",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+    )))]
+    pub const MH: Protocol = Protocol(new_raw_protocol(c::IPPROTO_MH as _));
+    /// `IPPROTO_ROUTING`
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
+    pub const ROUTING: Protocol = Protocol(new_raw_protocol(c::IPPROTO_ROUTING as _));
+}
+
+/// `SYSPROTO_*` constants.
+pub mod sysproto {
+    #[cfg(apple)]
+    use {
+        super::{new_raw_protocol, Protocol},
+        crate::backend::c,
+    };
+
+    /// `SYSPROTO_EVENT`
+    #[cfg(apple)]
+    pub const EVENT: Protocol = Protocol(new_raw_protocol(c::SYSPROTO_EVENT as _));
+
+    /// `SYSPROTO_CONTROL`
+    #[cfg(apple)]
+    pub const CONTROL: Protocol = Protocol(new_raw_protocol(c::SYSPROTO_CONTROL as _));
+}
+
+/// `NETLINK_*` constants.
+///
+/// For `NETLINK_ROUTE`, pass `None` as the `protocol` argument.
+pub mod netlink {
+    #[cfg(linux_kernel)]
+    use {
+        super::{new_raw_protocol, Protocol},
+        crate::backend::c,
+    };
+
+    /// `NETLINK_UNUSED`
+    #[cfg(linux_kernel)]
+    pub const UNUSED: Protocol = Protocol(new_raw_protocol(c::NETLINK_UNUSED as _));
+    /// `NETLINK_USERSOCK`
+    #[cfg(linux_kernel)]
+    pub const USERSOCK: Protocol = Protocol(new_raw_protocol(c::NETLINK_USERSOCK as _));
+    /// `NETLINK_FIREWALL`
+    #[cfg(linux_kernel)]
+    pub const FIREWALL: Protocol = Protocol(new_raw_protocol(c::NETLINK_FIREWALL as _));
+    /// `NETLINK_SOCK_DIAG`
+    #[cfg(linux_kernel)]
+    pub const SOCK_DIAG: Protocol = Protocol(new_raw_protocol(c::NETLINK_SOCK_DIAG as _));
+    /// `NETLINK_NFLOG`
+    #[cfg(linux_kernel)]
+    pub const NFLOG: Protocol = Protocol(new_raw_protocol(c::NETLINK_NFLOG as _));
+    /// `NETLINK_XFRM`
+    #[cfg(linux_kernel)]
+    pub const XFRM: Protocol = Protocol(new_raw_protocol(c::NETLINK_XFRM as _));
+    /// `NETLINK_SELINUX`
+    #[cfg(linux_kernel)]
+    pub const SELINUX: Protocol = Protocol(new_raw_protocol(c::NETLINK_SELINUX as _));
+    /// `NETLINK_ISCSI`
+    #[cfg(linux_kernel)]
+    pub const ISCSI: Protocol = Protocol(new_raw_protocol(c::NETLINK_ISCSI as _));
+    /// `NETLINK_AUDIT`
+    #[cfg(linux_kernel)]
+    pub const AUDIT: Protocol = Protocol(new_raw_protocol(c::NETLINK_AUDIT as _));
+    /// `NETLINK_FIB_LOOKUP`
+    #[cfg(linux_kernel)]
+    pub const FIB_LOOKUP: Protocol = Protocol(new_raw_protocol(c::NETLINK_FIB_LOOKUP as _));
+    /// `NETLINK_CONNECTOR`
+    #[cfg(linux_kernel)]
+    pub const CONNECTOR: Protocol = Protocol(new_raw_protocol(c::NETLINK_CONNECTOR as _));
+    /// `NETLINK_NETFILTER`
+    #[cfg(linux_kernel)]
+    pub const NETFILTER: Protocol = Protocol(new_raw_protocol(c::NETLINK_NETFILTER as _));
+    /// `NETLINK_IP6_FW`
+    #[cfg(linux_kernel)]
+    pub const IP6_FW: Protocol = Protocol(new_raw_protocol(c::NETLINK_IP6_FW as _));
+    /// `NETLINK_DNRTMSG`
+    #[cfg(linux_kernel)]
+    pub const DNRTMSG: Protocol = Protocol(new_raw_protocol(c::NETLINK_DNRTMSG as _));
+    /// `NETLINK_KOBJECT_UEVENT`
+    #[cfg(linux_kernel)]
+    pub const KOBJECT_UEVENT: Protocol = Protocol(new_raw_protocol(c::NETLINK_KOBJECT_UEVENT as _));
+    /// `NETLINK_GENERIC`
+    // This is defined on FreeBSD too, but it has the value 0, so it doesn't
+    // fit in or `NonZeroU32`. It's unclear whether FreeBSD intends
+    // `NETLINK_GENERIC` to be the default when Linux has `NETLINK_ROUTE`
+    // as the default.
+    #[cfg(linux_kernel)]
+    pub const GENERIC: Protocol = Protocol(new_raw_protocol(c::NETLINK_GENERIC as _));
+    /// `NETLINK_SCSITRANSPORT`
+    #[cfg(linux_kernel)]
+    pub const SCSITRANSPORT: Protocol = Protocol(new_raw_protocol(c::NETLINK_SCSITRANSPORT as _));
+    /// `NETLINK_ECRYPTFS`
+    #[cfg(linux_kernel)]
+    pub const ECRYPTFS: Protocol = Protocol(new_raw_protocol(c::NETLINK_ECRYPTFS as _));
+    /// `NETLINK_RDMA`
+    #[cfg(linux_kernel)]
+    pub const RDMA: Protocol = Protocol(new_raw_protocol(c::NETLINK_RDMA as _));
+    /// `NETLINK_CRYPTO`
+    #[cfg(linux_kernel)]
+    pub const CRYPTO: Protocol = Protocol(new_raw_protocol(c::NETLINK_CRYPTO as _));
+    /// `NETLINK_INET_DIAG`
+    #[cfg(linux_kernel)]
+    pub const INET_DIAG: Protocol = Protocol(new_raw_protocol(c::NETLINK_INET_DIAG as _));
+    /// `NETLINK_ADD_MEMBERSHIP`
+    #[cfg(linux_kernel)]
+    pub const ADD_MEMBERSHIP: Protocol = Protocol(new_raw_protocol(c::NETLINK_ADD_MEMBERSHIP as _));
+    /// `NETLINK_DROP_MEMBERSHIP`
+    #[cfg(linux_kernel)]
+    pub const DROP_MEMBERSHIP: Protocol =
+        Protocol(new_raw_protocol(c::NETLINK_DROP_MEMBERSHIP as _));
+    /// `NETLINK_PKTINFO`
+    #[cfg(linux_kernel)]
+    pub const PKTINFO: Protocol = Protocol(new_raw_protocol(c::NETLINK_PKTINFO as _));
+    /// `NETLINK_BROADCAST_ERROR`
+    #[cfg(linux_kernel)]
+    pub const BROADCAST_ERROR: Protocol =
+        Protocol(new_raw_protocol(c::NETLINK_BROADCAST_ERROR as _));
+    /// `NETLINK_NO_ENOBUFS`
+    #[cfg(linux_kernel)]
+    pub const NO_ENOBUFS: Protocol = Protocol(new_raw_protocol(c::NETLINK_NO_ENOBUFS as _));
+    /// `NETLINK_RX_RING`
+    #[cfg(linux_kernel)]
+    pub const RX_RING: Protocol = Protocol(new_raw_protocol(c::NETLINK_RX_RING as _));
+    /// `NETLINK_TX_RING`
+    #[cfg(linux_kernel)]
+    pub const TX_RING: Protocol = Protocol(new_raw_protocol(c::NETLINK_TX_RING as _));
+    /// `NETLINK_LISTEN_ALL_NSID`
+    #[cfg(linux_kernel)]
+    pub const LISTEN_ALL_NSID: Protocol =
+        Protocol(new_raw_protocol(c::NETLINK_LISTEN_ALL_NSID as _));
+    /// `NETLINK_LIST_MEMBERSHIPS`
+    #[cfg(linux_kernel)]
+    pub const LIST_MEMBERSHIPS: Protocol =
+        Protocol(new_raw_protocol(c::NETLINK_LIST_MEMBERSHIPS as _));
+    /// `NETLINK_CAP_ACK`
+    #[cfg(linux_kernel)]
+    pub const CAP_ACK: Protocol = Protocol(new_raw_protocol(c::NETLINK_CAP_ACK as _));
+    /// `NETLINK_EXT_ACK`
+    #[cfg(linux_kernel)]
+    pub const EXT_ACK: Protocol = Protocol(new_raw_protocol(c::NETLINK_EXT_ACK as _));
+    /// `NETLINK_GET_STRICT_CHK`
+    #[cfg(linux_kernel)]
+    pub const GET_STRICT_CHK: Protocol = Protocol(new_raw_protocol(c::NETLINK_GET_STRICT_CHK as _));
+}
+
+/// `ETH_P_*` constants.
+// These are translated into 16-bit big-endian form because that's what the
+// [`AddressFamily::PACKET`] address family [expects].
+//
+// [expects]: https://man7.org/linux/man-pages/man7/packet.7.html
+pub mod eth {
+    #[cfg(linux_kernel)]
+    use {
+        super::{new_raw_protocol, Protocol},
+        crate::backend::c,
+    };
+
+    /// `ETH_P_LOOP`
+    #[cfg(linux_kernel)]
+    pub const LOOP: Protocol = Protocol(new_raw_protocol((c::ETH_P_LOOP as u16).to_be() as u32));
+    /// `ETH_P_PUP`
+    #[cfg(linux_kernel)]
+    pub const PUP: Protocol = Protocol(new_raw_protocol((c::ETH_P_PUP as u16).to_be() as u32));
+    /// `ETH_P_PUPAT`
+    #[cfg(linux_kernel)]
+    pub const PUPAT: Protocol = Protocol(new_raw_protocol((c::ETH_P_PUPAT as u16).to_be() as u32));
+    /// `ETH_P_TSN`
+    #[cfg(linux_kernel)]
+    pub const TSN: Protocol = Protocol(new_raw_protocol((c::ETH_P_TSN as u16).to_be() as u32));
+    /// `ETH_P_ERSPAN2`
+    #[cfg(linux_kernel)]
+    pub const ERSPAN2: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_ERSPAN2 as u16).to_be() as u32));
+    /// `ETH_P_IP`
+    #[cfg(linux_kernel)]
+    pub const IP: Protocol = Protocol(new_raw_protocol((c::ETH_P_IP as u16).to_be() as u32));
+    /// `ETH_P_X25`
+    #[cfg(linux_kernel)]
+    pub const X25: Protocol = Protocol(new_raw_protocol((c::ETH_P_X25 as u16).to_be() as u32));
+    /// `ETH_P_ARP`
+    #[cfg(linux_kernel)]
+    pub const ARP: Protocol = Protocol(new_raw_protocol((c::ETH_P_ARP as u16).to_be() as u32));
+    /// `ETH_P_BPQ`
+    #[cfg(linux_kernel)]
+    pub const BPQ: Protocol = Protocol(new_raw_protocol((c::ETH_P_BPQ as u16).to_be() as u32));
+    /// `ETH_P_IEEEPUP`
+    #[cfg(linux_kernel)]
+    pub const IEEEPUP: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_IEEEPUP as u16).to_be() as u32));
+    /// `ETH_P_IEEEPUPAT`
+    #[cfg(linux_kernel)]
+    pub const IEEEPUPAT: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_IEEEPUPAT as u16).to_be() as u32));
+    /// `ETH_P_BATMAN`
+    #[cfg(linux_kernel)]
+    pub const BATMAN: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_BATMAN as u16).to_be() as u32));
+    /// `ETH_P_DEC`
+    #[cfg(linux_kernel)]
+    pub const DEC: Protocol = Protocol(new_raw_protocol((c::ETH_P_DEC as u16).to_be() as u32));
+    /// `ETH_P_DNA_DL`
+    #[cfg(linux_kernel)]
+    pub const DNA_DL: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_DNA_DL as u16).to_be() as u32));
+    /// `ETH_P_DNA_RC`
+    #[cfg(linux_kernel)]
+    pub const DNA_RC: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_DNA_RC as u16).to_be() as u32));
+    /// `ETH_P_DNA_RT`
+    #[cfg(linux_kernel)]
+    pub const DNA_RT: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_DNA_RT as u16).to_be() as u32));
+    /// `ETH_P_LAT`
+    #[cfg(linux_kernel)]
+    pub const LAT: Protocol = Protocol(new_raw_protocol((c::ETH_P_LAT as u16).to_be() as u32));
+    /// `ETH_P_DIAG`
+    #[cfg(linux_kernel)]
+    pub const DIAG: Protocol = Protocol(new_raw_protocol((c::ETH_P_DIAG as u16).to_be() as u32));
+    /// `ETH_P_CUST`
+    #[cfg(linux_kernel)]
+    pub const CUST: Protocol = Protocol(new_raw_protocol((c::ETH_P_CUST as u16).to_be() as u32));
+    /// `ETH_P_SCA`
+    #[cfg(linux_kernel)]
+    pub const SCA: Protocol = Protocol(new_raw_protocol((c::ETH_P_SCA as u16).to_be() as u32));
+    /// `ETH_P_TEB`
+    #[cfg(linux_kernel)]
+    pub const TEB: Protocol = Protocol(new_raw_protocol((c::ETH_P_TEB as u16).to_be() as u32));
+    /// `ETH_P_RARP`
+    #[cfg(linux_kernel)]
+    pub const RARP: Protocol = Protocol(new_raw_protocol((c::ETH_P_RARP as u16).to_be() as u32));
+    /// `ETH_P_ATALK`
+    #[cfg(linux_kernel)]
+    pub const ATALK: Protocol = Protocol(new_raw_protocol((c::ETH_P_ATALK as u16).to_be() as u32));
+    /// `ETH_P_AARP`
+    #[cfg(linux_kernel)]
+    pub const AARP: Protocol = Protocol(new_raw_protocol((c::ETH_P_AARP as u16).to_be() as u32));
+    /// `ETH_P_8021Q`
+    #[cfg(linux_kernel)]
+    pub const P_8021Q: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_8021Q as u16).to_be() as u32));
+    /// `ETH_P_ERSPAN`
+    #[cfg(linux_kernel)]
+    pub const ERSPAN: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_ERSPAN as u16).to_be() as u32));
+    /// `ETH_P_IPX`
+    #[cfg(linux_kernel)]
+    pub const IPX: Protocol = Protocol(new_raw_protocol((c::ETH_P_IPX as u16).to_be() as u32));
+    /// `ETH_P_IPV6`
+    #[cfg(linux_kernel)]
+    pub const IPV6: Protocol = Protocol(new_raw_protocol((c::ETH_P_IPV6 as u16).to_be() as u32));
+    /// `ETH_P_PAUSE`
+    #[cfg(linux_kernel)]
+    pub const PAUSE: Protocol = Protocol(new_raw_protocol((c::ETH_P_PAUSE as u16).to_be() as u32));
+    /// `ETH_P_SLOW`
+    #[cfg(linux_kernel)]
+    pub const SLOW: Protocol = Protocol(new_raw_protocol((c::ETH_P_SLOW as u16).to_be() as u32));
+    /// `ETH_P_WCCP`
+    #[cfg(linux_kernel)]
+    pub const WCCP: Protocol = Protocol(new_raw_protocol((c::ETH_P_WCCP as u16).to_be() as u32));
+    /// `ETH_P_MPLS_UC`
+    #[cfg(linux_kernel)]
+    pub const MPLS_UC: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_MPLS_UC as u16).to_be() as u32));
+    /// `ETH_P_MPLS_MC`
+    #[cfg(linux_kernel)]
+    pub const MPLS_MC: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_MPLS_MC as u16).to_be() as u32));
+    /// `ETH_P_ATMMPOA`
+    #[cfg(linux_kernel)]
+    pub const ATMMPOA: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_ATMMPOA as u16).to_be() as u32));
+    /// `ETH_P_PPP_DISC`
+    #[cfg(linux_kernel)]
+    pub const PPP_DISC: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_PPP_DISC as u16).to_be() as u32));
+    /// `ETH_P_PPP_SES`
+    #[cfg(linux_kernel)]
+    pub const PPP_SES: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_PPP_SES as u16).to_be() as u32));
+    /// `ETH_P_LINK_CTL`
+    #[cfg(linux_kernel)]
+    pub const LINK_CTL: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_LINK_CTL as u16).to_be() as u32));
+    /// `ETH_P_ATMFATE`
+    #[cfg(linux_kernel)]
+    pub const ATMFATE: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_ATMFATE as u16).to_be() as u32));
+    /// `ETH_P_PAE`
+    #[cfg(linux_kernel)]
+    pub const PAE: Protocol = Protocol(new_raw_protocol((c::ETH_P_PAE as u16).to_be() as u32));
+    /// `ETH_P_PROFINET`
+    #[cfg(linux_kernel)]
+    pub const PROFINET: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_PROFINET as u16).to_be() as u32));
+    /// `ETH_P_REALTEK`
+    #[cfg(linux_kernel)]
+    pub const REALTEK: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_REALTEK as u16).to_be() as u32));
+    /// `ETH_P_AOE`
+    #[cfg(linux_kernel)]
+    pub const AOE: Protocol = Protocol(new_raw_protocol((c::ETH_P_AOE as u16).to_be() as u32));
+    /// `ETH_P_ETHERCAT`
+    #[cfg(linux_kernel)]
+    pub const ETHERCAT: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_ETHERCAT as u16).to_be() as u32));
+    /// `ETH_P_8021AD`
+    #[cfg(linux_kernel)]
+    pub const P_8021AD: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_8021AD as u16).to_be() as u32));
+    /// `ETH_P_802_EX1`
+    #[cfg(linux_kernel)]
+    pub const P_802_EX1: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_802_EX1 as u16).to_be() as u32));
+    /// `ETH_P_PREAUTH`
+    #[cfg(linux_kernel)]
+    pub const PREAUTH: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_PREAUTH as u16).to_be() as u32));
+    /// `ETH_P_TIPC`
+    #[cfg(linux_kernel)]
+    pub const TIPC: Protocol = Protocol(new_raw_protocol((c::ETH_P_TIPC as u16).to_be() as u32));
+    /// `ETH_P_LLDP`
+    #[cfg(linux_kernel)]
+    pub const LLDP: Protocol = Protocol(new_raw_protocol((c::ETH_P_LLDP as u16).to_be() as u32));
+    /// `ETH_P_MRP`
+    #[cfg(linux_kernel)]
+    pub const MRP: Protocol = Protocol(new_raw_protocol((c::ETH_P_MRP as u16).to_be() as u32));
+    /// `ETH_P_MACSEC`
+    #[cfg(linux_kernel)]
+    pub const MACSEC: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_MACSEC as u16).to_be() as u32));
+    /// `ETH_P_8021AH`
+    #[cfg(linux_kernel)]
+    pub const P_8021AH: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_8021AH as u16).to_be() as u32));
+    /// `ETH_P_MVRP`
+    #[cfg(linux_kernel)]
+    pub const MVRP: Protocol = Protocol(new_raw_protocol((c::ETH_P_MVRP as u16).to_be() as u32));
+    /// `ETH_P_1588`
+    #[cfg(linux_kernel)]
+    pub const P_1588: Protocol = Protocol(new_raw_protocol((c::ETH_P_1588 as u16).to_be() as u32));
+    /// `ETH_P_NCSI`
+    #[cfg(linux_kernel)]
+    pub const NCSI: Protocol = Protocol(new_raw_protocol((c::ETH_P_NCSI as u16).to_be() as u32));
+    /// `ETH_P_PRP`
+    #[cfg(linux_kernel)]
+    pub const PRP: Protocol = Protocol(new_raw_protocol((c::ETH_P_PRP as u16).to_be() as u32));
+    /// `ETH_P_CFM`
+    #[cfg(linux_kernel)]
+    pub const CFM: Protocol = Protocol(new_raw_protocol((c::ETH_P_CFM as u16).to_be() as u32));
+    /// `ETH_P_FCOE`
+    #[cfg(linux_kernel)]
+    pub const FCOE: Protocol = Protocol(new_raw_protocol((c::ETH_P_FCOE as u16).to_be() as u32));
+    /// `ETH_P_IBOE`
+    #[cfg(linux_kernel)]
+    pub const IBOE: Protocol = Protocol(new_raw_protocol((c::ETH_P_IBOE as u16).to_be() as u32));
+    /// `ETH_P_TDLS`
+    #[cfg(linux_kernel)]
+    pub const TDLS: Protocol = Protocol(new_raw_protocol((c::ETH_P_TDLS as u16).to_be() as u32));
+    /// `ETH_P_FIP`
+    #[cfg(linux_kernel)]
+    pub const FIP: Protocol = Protocol(new_raw_protocol((c::ETH_P_FIP as u16).to_be() as u32));
+    /// `ETH_P_80221`
+    #[cfg(linux_kernel)]
+    pub const P_80221: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_80221 as u16).to_be() as u32));
+    /// `ETH_P_HSR`
+    #[cfg(linux_kernel)]
+    pub const HSR: Protocol = Protocol(new_raw_protocol((c::ETH_P_HSR as u16).to_be() as u32));
+    /// `ETH_P_NSH`
+    #[cfg(linux_kernel)]
+    pub const NSH: Protocol = Protocol(new_raw_protocol((c::ETH_P_NSH as u16).to_be() as u32));
+    /// `ETH_P_LOOPBACK`
+    #[cfg(linux_kernel)]
+    pub const LOOPBACK: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_LOOPBACK as u16).to_be() as u32));
+    /// `ETH_P_QINQ1`
+    #[cfg(linux_kernel)]
+    pub const QINQ1: Protocol = Protocol(new_raw_protocol((c::ETH_P_QINQ1 as u16).to_be() as u32));
+    /// `ETH_P_QINQ2`
+    #[cfg(linux_kernel)]
+    pub const QINQ2: Protocol = Protocol(new_raw_protocol((c::ETH_P_QINQ2 as u16).to_be() as u32));
+    /// `ETH_P_QINQ3`
+    #[cfg(linux_kernel)]
+    pub const QINQ3: Protocol = Protocol(new_raw_protocol((c::ETH_P_QINQ3 as u16).to_be() as u32));
+    /// `ETH_P_EDSA`
+    #[cfg(linux_kernel)]
+    pub const EDSA: Protocol = Protocol(new_raw_protocol((c::ETH_P_EDSA as u16).to_be() as u32));
+    /// `ETH_P_DSA_8021Q`
+    #[cfg(linux_kernel)]
+    pub const DSA_8021Q: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_DSA_8021Q as u16).to_be() as u32));
+    /// `ETH_P_DSA_A5PSW`
+    #[cfg(linux_kernel)]
+    pub const DSA_A5PSW: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_DSA_A5PSW as u16).to_be() as u32));
+    /// `ETH_P_IFE`
+    #[cfg(linux_kernel)]
+    pub const IFE: Protocol = Protocol(new_raw_protocol((c::ETH_P_IFE as u16).to_be() as u32));
+    /// `ETH_P_AF_IUCV`
+    #[cfg(linux_kernel)]
+    pub const AF_IUCV: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_AF_IUCV as u16).to_be() as u32));
+    /// `ETH_P_802_3_MIN`
+    #[cfg(linux_kernel)]
+    pub const P_802_3_MIN: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_802_3_MIN as u16).to_be() as u32));
+    /// `ETH_P_802_3`
+    #[cfg(linux_kernel)]
+    pub const P_802_3: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_802_3 as u16).to_be() as u32));
+    /// `ETH_P_AX25`
+    #[cfg(linux_kernel)]
+    pub const AX25: Protocol = Protocol(new_raw_protocol((c::ETH_P_AX25 as u16).to_be() as u32));
+    /// `ETH_P_ALL`
+    #[cfg(linux_kernel)]
+    pub const ALL: Protocol = Protocol(new_raw_protocol((c::ETH_P_ALL as u16).to_be() as u32));
+    /// `ETH_P_802_2`
+    #[cfg(linux_kernel)]
+    pub const P_802_2: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_802_2 as u16).to_be() as u32));
+    /// `ETH_P_SNAP`
+    #[cfg(linux_kernel)]
+    pub const SNAP: Protocol = Protocol(new_raw_protocol((c::ETH_P_SNAP as u16).to_be() as u32));
+    /// `ETH_P_DDCMP`
+    #[cfg(linux_kernel)]
+    pub const DDCMP: Protocol = Protocol(new_raw_protocol((c::ETH_P_DDCMP as u16).to_be() as u32));
+    /// `ETH_P_WAN_PPP`
+    #[cfg(linux_kernel)]
+    pub const WAN_PPP: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_WAN_PPP as u16).to_be() as u32));
+    /// `ETH_P_PPP_MP`
+    #[cfg(linux_kernel)]
+    pub const PPP_MP: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_PPP_MP as u16).to_be() as u32));
+    /// `ETH_P_LOCALTALK`
+    #[cfg(linux_kernel)]
+    pub const LOCALTALK: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_LOCALTALK as u16).to_be() as u32));
+    /// `ETH_P_CAN`
+    #[cfg(linux_kernel)]
+    pub const CAN: Protocol = Protocol(new_raw_protocol((c::ETH_P_CAN as u16).to_be() as u32));
+    /// `ETH_P_CANFD`
+    #[cfg(linux_kernel)]
+    pub const CANFD: Protocol = Protocol(new_raw_protocol((c::ETH_P_CANFD as u16).to_be() as u32));
+    /// `ETH_P_CANXL`
+    #[cfg(linux_kernel)]
+    pub const CANXL: Protocol = Protocol(new_raw_protocol((c::ETH_P_CANXL as u16).to_be() as u32));
+    /// `ETH_P_PPPTALK`
+    #[cfg(linux_kernel)]
+    pub const PPPTALK: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_PPPTALK as u16).to_be() as u32));
+    /// `ETH_P_TR_802_2`
+    #[cfg(linux_kernel)]
+    pub const TR_802_2: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_TR_802_2 as u16).to_be() as u32));
+    /// `ETH_P_MOBITEX`
+    #[cfg(linux_kernel)]
+    pub const MOBITEX: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_MOBITEX as u16).to_be() as u32));
+    /// `ETH_P_CONTROL`
+    #[cfg(linux_kernel)]
+    pub const CONTROL: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_CONTROL as u16).to_be() as u32));
+    /// `ETH_P_IRDA`
+    #[cfg(linux_kernel)]
+    pub const IRDA: Protocol = Protocol(new_raw_protocol((c::ETH_P_IRDA as u16).to_be() as u32));
+    /// `ETH_P_ECONET`
+    #[cfg(linux_kernel)]
+    pub const ECONET: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_ECONET as u16).to_be() as u32));
+    /// `ETH_P_HDLC`
+    #[cfg(linux_kernel)]
+    pub const HDLC: Protocol = Protocol(new_raw_protocol((c::ETH_P_HDLC as u16).to_be() as u32));
+    /// `ETH_P_ARCNET`
+    #[cfg(linux_kernel)]
+    pub const ARCNET: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_ARCNET as u16).to_be() as u32));
+    /// `ETH_P_DSA`
+    #[cfg(linux_kernel)]
+    pub const DSA: Protocol = Protocol(new_raw_protocol((c::ETH_P_DSA as u16).to_be() as u32));
+    /// `ETH_P_TRAILER`
+    #[cfg(linux_kernel)]
+    pub const TRAILER: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_TRAILER as u16).to_be() as u32));
+    /// `ETH_P_PHONET`
+    #[cfg(linux_kernel)]
+    pub const PHONET: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_PHONET as u16).to_be() as u32));
+    /// `ETH_P_IEEE802154`
+    #[cfg(linux_kernel)]
+    pub const IEEE802154: Protocol =
+        Protocol(new_raw_protocol((c::ETH_P_IEEE802154 as u16).to_be() as u32));
+    /// `ETH_P_CAIF`
+    #[cfg(linux_kernel)]
+    pub const CAIF: Protocol = Protocol(new_raw_protocol((c::ETH_P_CAIF as u16).to_be() as u32));
+    /// `ETH_P_XDSA`
+    #[cfg(linux_kernel)]
+    pub const XDSA: Protocol = Protocol(new_raw_protocol((c::ETH_P_XDSA as u16).to_be() as u32));
+    /// `ETH_P_MAP`
+    #[cfg(linux_kernel)]
+    pub const MAP: Protocol = Protocol(new_raw_protocol((c::ETH_P_MAP as u16).to_be() as u32));
+    /// `ETH_P_MCTP`
+    #[cfg(linux_kernel)]
+    pub const MCTP: Protocol = Protocol(new_raw_protocol((c::ETH_P_MCTP as u16).to_be() as u32));
+}
+
+#[rustfmt::skip]
+impl Protocol {
+    /// Constructs a `Protocol` from a raw integer.
+    #[inline]
+    pub const fn from_raw(raw: RawProtocol) -> Self {
+        Self(raw)
+    }
+
+    /// Returns the raw integer for this `Protocol`.
+    #[inline]
+    pub const fn as_raw(self) -> RawProtocol {
+        self.0
+    }
+}
+
+/// `SHUT_*` constants for use with [`shutdown`].
+///
+/// [`shutdown`]: crate::net::shutdown
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
+#[repr(u32)]
+pub enum Shutdown {
+    /// `SHUT_RD`—Disable further read operations.
+    Read = c::SHUT_RD as _,
+    /// `SHUT_WR`—Disable further write operations.
+    Write = c::SHUT_WR as _,
+    /// `SHUT_RDWR`—Disable further read and write operations.
+    ReadWrite = c::SHUT_RDWR as _,
+}
+
+bitflags! {
+    /// `SOCK_*` constants for use with [`socket_with`], [`accept_with`] and
+    /// [`acceptfrom_with`].
+    ///
+    /// [`socket_with`]: crate::net::socket_with
+    /// [`accept_with`]: crate::net::accept_with
+    /// [`acceptfrom_with`]: crate::net::acceptfrom_with
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct SocketFlags: c::c_uint {
+        /// `SOCK_NONBLOCK`
+        #[cfg(not(any(
+            apple,
+            windows,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "nto",
+            target_os = "vita",
+        )))]
+        const NONBLOCK = bitcast!(c::SOCK_NONBLOCK);
+
+        /// `SOCK_CLOEXEC`
+        #[cfg(not(any(apple, windows, target_os = "aix", target_os = "haiku")))]
+        const CLOEXEC = bitcast!(c::SOCK_CLOEXEC);
+
+        // This deliberately lacks a `const _ = !0`, so that users can use
+        // `from_bits_truncate` to extract the `SocketFlags` from a flags
+        // value that also includes a `SocketType`.
+    }
+}
+
+/// UNIX credentials of socket peer, for use with [`get_socket_peercred`]
+/// [`SendAncillaryMessage::ScmCredentials`] and
+/// [`RecvAncillaryMessage::ScmCredentials`].
+///
+/// [`get_socket_peercred`]: crate::net::sockopt::get_socket_peercred
+/// [`SendAncillaryMessage::ScmCredentials`]: crate::net::SendAncillaryMessage::ScmCredentials
+/// [`RecvAncillaryMessage::ScmCredentials`]: crate::net::RecvAncillaryMessage::ScmCredentials
+#[cfg(linux_kernel)]
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
+#[repr(C)]
+pub struct UCred {
+    /// Process ID of peer
+    pub pid: crate::pid::Pid,
+    /// User ID of peer
+    pub uid: crate::ugid::Uid,
+    /// Group ID of peer
+    pub gid: crate::ugid::Gid,
+}
+
+#[test]
+fn test_sizes() {
+    use c::c_int;
+    use core::mem::transmute;
+
+    // Backend code needs to cast these to `c_int` so make sure that cast isn't
+    // lossy.
+    assert_eq_size!(RawProtocol, c_int);
+    assert_eq_size!(Protocol, c_int);
+    assert_eq_size!(Option<RawProtocol>, c_int);
+    assert_eq_size!(Option<Protocol>, c_int);
+    assert_eq_size!(RawSocketType, c_int);
+    assert_eq_size!(SocketType, c_int);
+    assert_eq_size!(SocketFlags, c_int);
+
+    // Rustix doesn't depend on `Option<Protocol>` matching the ABI of a raw
+    // integer for correctness, but it should work nonetheless.
+    #[allow(unsafe_code)]
+    unsafe {
+        let t: Option<Protocol> = None;
+        assert_eq!(0_u32, transmute::<Option<Protocol>, u32>(t));
+
+        let t: Option<Protocol> = Some(Protocol::from_raw(RawProtocol::new(4567).unwrap()));
+        assert_eq!(4567_u32, transmute::<Option<Protocol>, u32>(t));
+    }
+
+    #[cfg(linux_kernel)]
+    assert_eq_size!(UCred, libc::ucred);
+}
diff --git a/vendor/rustix/src/net/wsa.rs b/vendor/rustix/src/net/wsa.rs
new file mode 100644
index 0000000..0ad4db5
--- /dev/null
+++ b/vendor/rustix/src/net/wsa.rs
@@ -0,0 +1,49 @@
+use crate::io;
+use core::mem::MaybeUninit;
+use windows_sys::Win32::Networking::WinSock::{WSACleanup, WSAGetLastError, WSAStartup, WSADATA};
+
+/// `WSAStartup()`—Initialize process-wide Windows support for sockets.
+///
+/// On Windows, it's necessary to initialize the sockets subsystem before
+/// using sockets APIs. The function performs the necessary initialization.
+///
+/// # References
+///  - [Winsock]
+///
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-wsastartup
+pub fn wsa_startup() -> io::Result<WSADATA> {
+    // Request version 2.2, which has been the latest version since far older
+    // versions of Windows than we support here. For more information about
+    // the version, see [here].
+    //
+    // [here]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-wsastartup#remarks
+    let version = 0x202;
+    let mut data = MaybeUninit::uninit();
+    unsafe {
+        let ret = WSAStartup(version, data.as_mut_ptr());
+        if ret == 0 {
+            Ok(data.assume_init())
+        } else {
+            Err(io::Errno::from_raw_os_error(WSAGetLastError()))
+        }
+    }
+}
+
+/// `WSACleanup()`—Clean up process-wide Windows support for sockets.
+///
+/// In a program where `init` is called, if sockets are no longer necessary,
+/// this function releases associated resources.
+///
+/// # References
+///  - [Winsock]
+///
+/// [Winsock]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-wsacleanup
+pub fn wsa_cleanup() -> io::Result<()> {
+    unsafe {
+        if WSACleanup() == 0 {
+            Ok(())
+        } else {
+            Err(io::Errno::from_raw_os_error(WSAGetLastError()))
+        }
+    }
+}
diff --git a/vendor/rustix/src/param/auxv.rs b/vendor/rustix/src/param/auxv.rs
new file mode 100644
index 0000000..19f93dc
--- /dev/null
+++ b/vendor/rustix/src/param/auxv.rs
@@ -0,0 +1,87 @@
+use crate::backend;
+#[cfg(any(
+    linux_raw,
+    any(
+        all(target_os = "android", target_pointer_width = "64"),
+        target_os = "linux",
+    )
+))]
+use crate::ffi::CStr;
+
+/// `sysconf(_SC_PAGESIZE)`—Returns the process' page size.
+///
+/// Also known as `getpagesize`.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux `sysconf`]
+///  - [Linux `getpagesize`]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sysconf.html
+/// [Linux `sysconf`]: https://man7.org/linux/man-pages/man3/sysconf.3.html
+/// [Linux `getpagesize`]: https://man7.org/linux/man-pages/man2/getpagesize.2.html
+#[inline]
+#[doc(alias = "_SC_PAGESIZE")]
+#[doc(alias = "_SC_PAGE_SIZE")]
+#[doc(alias = "getpagesize")]
+pub fn page_size() -> usize {
+    backend::param::auxv::page_size()
+}
+
+/// `sysconf(_SC_CLK_TCK)`—Returns the process' clock ticks per second.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sysconf.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/sysconf.3.html
+#[cfg(not(any(target_os = "vita", target_os = "wasi")))]
+#[inline]
+#[doc(alias = "_SC_CLK_TCK")]
+pub fn clock_ticks_per_second() -> u64 {
+    backend::param::auxv::clock_ticks_per_second()
+}
+
+/// `(getauxval(AT_HWCAP), getauxval(AT_HWCAP2)`—Returns the Linux "hwcap"
+/// data.
+///
+/// Return the Linux `AT_HWCAP` and `AT_HWCAP2` values passed to the
+/// current process. Returns 0 for each value if it is not available.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man3/getauxval.3.html
+#[cfg(any(
+    linux_raw,
+    any(
+        all(target_os = "android", target_pointer_width = "64"),
+        target_os = "linux",
+    )
+))]
+#[inline]
+pub fn linux_hwcap() -> (usize, usize) {
+    backend::param::auxv::linux_hwcap()
+}
+
+/// `getauxval(AT_EXECFN)`—Returns the Linux "execfn" string.
+///
+/// Return the string that Linux has recorded as the filesystem path to the
+/// executable. Returns an empty string if the string is not available.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man3/getauxval.3.html
+#[cfg(any(
+    linux_raw,
+    any(
+        all(target_os = "android", target_pointer_width = "64"),
+        target_os = "linux",
+    )
+))]
+#[inline]
+pub fn linux_execfn() -> &'static CStr {
+    backend::param::auxv::linux_execfn()
+}
diff --git a/vendor/rustix/src/param/init.rs b/vendor/rustix/src/param/init.rs
new file mode 100644
index 0000000..09d7c96
--- /dev/null
+++ b/vendor/rustix/src/param/init.rs
@@ -0,0 +1,23 @@
+//! rustix's `init` function.
+//!
+//! # Safety
+//!
+//! When "use-explicitly-provided-auxv" is enabled, the `init` function must be
+//! called before any other function in this module. It is unsafe because it
+//! operates on raw pointers.
+#![allow(unsafe_code)]
+
+use crate::backend;
+
+/// Initialize process-wide state.
+///
+/// # Safety
+///
+/// This must be passed a pointer to the original environment variable block
+/// set up by the OS at process startup, and it must be called before any
+/// other rustix functions are called.
+#[inline]
+#[doc(hidden)]
+pub unsafe fn init(envp: *mut *mut u8) {
+    backend::param::auxv::init(envp)
+}
diff --git a/vendor/rustix/src/param/mod.rs b/vendor/rustix/src/param/mod.rs
new file mode 100644
index 0000000..f0de9d4
--- /dev/null
+++ b/vendor/rustix/src/param/mod.rs
@@ -0,0 +1,14 @@
+//! Process parameters.
+//!
+//! These values correspond to `sysconf` in POSIX, and the auxv array in Linux.
+//! Despite the POSIX name “sysconf”, these aren't *system* configuration
+//! parameters; they're *process* configuration parameters, as they may differ
+//! between different processes on the same system.
+
+mod auxv;
+#[cfg(all(feature = "use-explicitly-provided-auxv", not(libc)))]
+mod init;
+
+pub use auxv::*;
+#[cfg(all(feature = "use-explicitly-provided-auxv", not(libc)))]
+pub use init::init;
diff --git a/vendor/rustix/src/path/arg.rs b/vendor/rustix/src/path/arg.rs
new file mode 100644
index 0000000..f71125d
--- /dev/null
+++ b/vendor/rustix/src/path/arg.rs
@@ -0,0 +1,1099 @@
+//! Convenient and efficient string argument passing.
+//!
+//! This module defines the `Arg` trait and implements it for several common
+//! string types. This allows users to pass any of these string types directly
+//! to rustix APIs with string arguments, and it allows rustix to implement
+//! NUL-termination without the need for copying where possible.
+
+use crate::ffi::CStr;
+use crate::io;
+#[cfg(feature = "itoa")]
+use crate::path::DecInt;
+use crate::path::SMALL_PATH_BUFFER_SIZE;
+#[cfg(all(feature = "alloc", feature = "itoa"))]
+use alloc::borrow::ToOwned;
+use core::mem::MaybeUninit;
+use core::{ptr, slice, str};
+#[cfg(feature = "std")]
+use std::ffi::{OsStr, OsString};
+#[cfg(all(feature = "std", target_os = "hermit"))]
+use std::os::hermit::ext::ffi::{OsStrExt, OsStringExt};
+#[cfg(all(feature = "std", unix))]
+use std::os::unix::ffi::{OsStrExt, OsStringExt};
+#[cfg(all(feature = "std", target_os = "vxworks"))]
+use std::os::vxworks::ext::ffi::{OsStrExt, OsStringExt};
+#[cfg(all(feature = "std", target_os = "wasi"))]
+use std::os::wasi::ffi::{OsStrExt, OsStringExt};
+#[cfg(feature = "std")]
+use std::path::{Component, Components, Iter, Path, PathBuf};
+#[cfg(feature = "alloc")]
+use {crate::ffi::CString, alloc::borrow::Cow};
+#[cfg(feature = "alloc")]
+use {alloc::string::String, alloc::vec::Vec};
+
+/// A trait for passing path arguments.
+///
+/// This is similar to [`AsRef`]`<`[`Path`]`>`, but is implemented for more
+/// kinds of strings and can convert into more kinds of strings.
+///
+/// # Examples
+///
+/// ```
+/// # #[cfg(any(feature = "fs", feature = "net"))]
+/// use rustix::ffi::CStr;
+/// use rustix::io;
+/// # #[cfg(any(feature = "fs", feature = "net"))]
+/// use rustix::path::Arg;
+///
+/// # #[cfg(any(feature = "fs", feature = "net"))]
+/// pub fn touch<P: Arg>(path: P) -> io::Result<()> {
+///     let path = path.into_c_str()?;
+///     _touch(&path)
+/// }
+///
+/// # #[cfg(any(feature = "fs", feature = "net"))]
+/// fn _touch(path: &CStr) -> io::Result<()> {
+///     // implementation goes here
+///     Ok(())
+/// }
+/// ```
+///
+/// Users can then call `touch("foo")`, `touch(cstr!("foo"))`,
+/// `touch(Path::new("foo"))`, or many other things.
+///
+/// [`AsRef`]: std::convert::AsRef
+pub trait Arg {
+    /// Returns a view of this string as a string slice.
+    fn as_str(&self) -> io::Result<&str>;
+
+    /// Returns a potentially-lossy rendering of this string as a
+    /// `Cow<'_, str>`.
+    #[cfg(feature = "alloc")]
+    fn to_string_lossy(&self) -> Cow<'_, str>;
+
+    /// Returns a view of this string as a maybe-owned [`CStr`].
+    #[cfg(feature = "alloc")]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>>;
+
+    /// Consumes `self` and returns a view of this string as a maybe-owned
+    /// [`CStr`].
+    #[cfg(feature = "alloc")]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b;
+
+    /// Runs a closure with `self` passed in as a `&CStr`.
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>;
+}
+
+impl Arg for &str {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        Ok(self)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        Cow::Borrowed(self)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(*self).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(
+            CString::new(self).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        with_c_str(self.as_bytes(), f)
+    }
+}
+
+#[cfg(feature = "alloc")]
+impl Arg for &String {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        Ok(self)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        Cow::Borrowed(self)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(String::as_str(self)).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        self.as_str().into_c_str()
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        with_c_str(self.as_bytes(), f)
+    }
+}
+
+#[cfg(feature = "alloc")]
+impl Arg for String {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        Ok(self)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        Cow::Borrowed(self)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(self.as_str()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(
+            CString::new(self).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        f(&CString::new(self).map_err(|_cstr_err| io::Errno::INVAL)?)
+    }
+}
+
+#[cfg(feature = "std")]
+impl Arg for &OsStr {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        self.to_str().ok_or(io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        OsStr::to_string_lossy(self)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(self.as_bytes()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(
+            CString::new(self.as_bytes()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        with_c_str(self.as_bytes(), f)
+    }
+}
+
+#[cfg(feature = "std")]
+impl Arg for &OsString {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        OsString::as_os_str(self).to_str().ok_or(io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        self.as_os_str().to_string_lossy()
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(OsString::as_os_str(self).as_bytes())
+                .map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        self.as_os_str().into_c_str()
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        with_c_str(self.as_bytes(), f)
+    }
+}
+
+#[cfg(feature = "std")]
+impl Arg for OsString {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        self.as_os_str().to_str().ok_or(io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        self.as_os_str().to_string_lossy()
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(self.as_bytes()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(
+            CString::new(self.into_vec()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        f(&CString::new(self.into_vec()).map_err(|_cstr_err| io::Errno::INVAL)?)
+    }
+}
+
+#[cfg(feature = "std")]
+impl Arg for &Path {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        self.as_os_str().to_str().ok_or(io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        Path::to_string_lossy(self)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(self.as_os_str().as_bytes()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(
+            CString::new(self.as_os_str().as_bytes()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        with_c_str(self.as_os_str().as_bytes(), f)
+    }
+}
+
+#[cfg(feature = "std")]
+impl Arg for &PathBuf {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        PathBuf::as_path(self)
+            .as_os_str()
+            .to_str()
+            .ok_or(io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        self.as_path().to_string_lossy()
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(PathBuf::as_path(self).as_os_str().as_bytes())
+                .map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        self.as_path().into_c_str()
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        with_c_str(self.as_os_str().as_bytes(), f)
+    }
+}
+
+#[cfg(feature = "std")]
+impl Arg for PathBuf {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        self.as_os_str().to_str().ok_or(io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        self.as_os_str().to_string_lossy()
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(self.as_os_str().as_bytes()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(
+            CString::new(self.into_os_string().into_vec()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        f(
+            &CString::new(self.into_os_string().into_vec())
+                .map_err(|_cstr_err| io::Errno::INVAL)?,
+        )
+    }
+}
+
+impl Arg for &CStr {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        self.to_str().map_err(|_utf8_err| io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        CStr::to_string_lossy(self)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Borrowed(self))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Borrowed(self))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        f(self)
+    }
+}
+
+#[cfg(feature = "alloc")]
+impl Arg for &CString {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        unimplemented!()
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        unimplemented!()
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Borrowed(self))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Borrowed(self))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        f(self)
+    }
+}
+
+#[cfg(feature = "alloc")]
+impl Arg for CString {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        self.to_str().map_err(|_utf8_err| io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        CStr::to_string_lossy(self)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Borrowed(self))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(self))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        f(&self)
+    }
+}
+
+#[cfg(feature = "alloc")]
+impl<'a> Arg for Cow<'a, str> {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        Ok(self)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        Cow::Borrowed(self)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(self.as_ref()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(
+            match self {
+                Cow::Owned(s) => CString::new(s),
+                Cow::Borrowed(s) => CString::new(s),
+            }
+            .map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        with_c_str(self.as_bytes(), f)
+    }
+}
+
+#[cfg(feature = "std")]
+#[cfg(feature = "alloc")]
+impl<'a> Arg for Cow<'a, OsStr> {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        (**self).to_str().ok_or(io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        (**self).to_string_lossy()
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(self.as_bytes()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(
+            match self {
+                Cow::Owned(os) => CString::new(os.into_vec()),
+                Cow::Borrowed(os) => CString::new(os.as_bytes()),
+            }
+            .map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        with_c_str(self.as_bytes(), f)
+    }
+}
+
+#[cfg(feature = "alloc")]
+impl<'a> Arg for Cow<'a, CStr> {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        self.to_str().map_err(|_utf8_err| io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        let borrow: &CStr = core::borrow::Borrow::borrow(self);
+        borrow.to_string_lossy()
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Borrowed(self))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(self)
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        f(&self)
+    }
+}
+
+#[cfg(feature = "std")]
+impl<'a> Arg for Component<'a> {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        self.as_os_str().to_str().ok_or(io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        self.as_os_str().to_string_lossy()
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(self.as_os_str().as_bytes()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(
+            CString::new(self.as_os_str().as_bytes()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        with_c_str(self.as_os_str().as_bytes(), f)
+    }
+}
+
+#[cfg(feature = "std")]
+impl<'a> Arg for Components<'a> {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        self.as_path().to_str().ok_or(io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        self.as_path().to_string_lossy()
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(self.as_path().as_os_str().as_bytes())
+                .map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(
+            CString::new(self.as_path().as_os_str().as_bytes())
+                .map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        with_c_str(self.as_path().as_os_str().as_bytes(), f)
+    }
+}
+
+#[cfg(feature = "std")]
+impl<'a> Arg for Iter<'a> {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        self.as_path().to_str().ok_or(io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        self.as_path().to_string_lossy()
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(self.as_path().as_os_str().as_bytes())
+                .map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(
+            CString::new(self.as_path().as_os_str().as_bytes())
+                .map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        with_c_str(self.as_path().as_os_str().as_bytes(), f)
+    }
+}
+
+impl Arg for &[u8] {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        str::from_utf8(self).map_err(|_utf8_err| io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        String::from_utf8_lossy(self)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(*self).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(
+            CString::new(self).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        with_c_str(self, f)
+    }
+}
+
+#[cfg(feature = "alloc")]
+impl Arg for &Vec<u8> {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        str::from_utf8(self).map_err(|_utf8_err| io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        String::from_utf8_lossy(self)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(self.as_slice()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(
+            CString::new(self.as_slice()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        with_c_str(self, f)
+    }
+}
+
+#[cfg(feature = "alloc")]
+impl Arg for Vec<u8> {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        str::from_utf8(self).map_err(|_utf8_err| io::Errno::INVAL)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        String::from_utf8_lossy(self)
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Owned(
+            CString::new(self.as_slice()).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(
+            CString::new(self).map_err(|_cstr_err| io::Errno::INVAL)?,
+        ))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        f(&CString::new(self).map_err(|_cstr_err| io::Errno::INVAL)?)
+    }
+}
+
+#[cfg(feature = "itoa")]
+impl Arg for DecInt {
+    #[inline]
+    fn as_str(&self) -> io::Result<&str> {
+        Ok(self.as_str())
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn to_string_lossy(&self) -> Cow<'_, str> {
+        Cow::Borrowed(self.as_str())
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn as_cow_c_str(&self) -> io::Result<Cow<'_, CStr>> {
+        Ok(Cow::Borrowed(self.as_c_str()))
+    }
+
+    #[cfg(feature = "alloc")]
+    #[inline]
+    fn into_c_str<'b>(self) -> io::Result<Cow<'b, CStr>>
+    where
+        Self: 'b,
+    {
+        Ok(Cow::Owned(self.as_c_str().to_owned()))
+    }
+
+    #[inline]
+    fn into_with_c_str<T, F>(self, f: F) -> io::Result<T>
+    where
+        Self: Sized,
+        F: FnOnce(&CStr) -> io::Result<T>,
+    {
+        f(self.as_c_str())
+    }
+}
+
+/// Runs a closure with `bytes` passed in as a `&CStr`.
+#[allow(unsafe_code, clippy::int_plus_one)]
+#[inline]
+fn with_c_str<T, F>(bytes: &[u8], f: F) -> io::Result<T>
+where
+    F: FnOnce(&CStr) -> io::Result<T>,
+{
+    // Most paths are less than `SMALL_PATH_BUFFER_SIZE` long. The rest can go
+    // through the dynamic allocation path. If you're opening many files in a
+    // directory with a long path, consider opening the directory and using
+    // `openat` to open the files under it, which will avoid this, and is often
+    // faster in the OS as well.
+
+    // Test with >= so that we have room for the trailing NUL.
+    if bytes.len() >= SMALL_PATH_BUFFER_SIZE {
+        return with_c_str_slow_path(bytes, f);
+    }
+
+    // Taken from
+    // <https://github.com/rust-lang/rust/blob/a00f8ba7fcac1b27341679c51bf5a3271fa82df3/library/std/src/sys/common/small_c_string.rs>
+    let mut buf = MaybeUninit::<[u8; SMALL_PATH_BUFFER_SIZE]>::uninit();
+    let buf_ptr = buf.as_mut_ptr().cast::<u8>();
+
+    // This helps test our safety condition below.
+    debug_assert!(bytes.len() + 1 <= SMALL_PATH_BUFFER_SIZE);
+
+    // SAFETY: `bytes.len() < SMALL_PATH_BUFFER_SIZE` which means we have space
+    // for `bytes.len() + 1` u8s:
+    unsafe {
+        ptr::copy_nonoverlapping(bytes.as_ptr(), buf_ptr, bytes.len());
+        buf_ptr.add(bytes.len()).write(0);
+    }
+
+    // SAFETY: We just wrote the bytes above and they will remain valid for the
+    // duration of `f` b/c buf doesn't get dropped until the end of the
+    // function.
+    match CStr::from_bytes_with_nul(unsafe { slice::from_raw_parts(buf_ptr, bytes.len() + 1) }) {
+        Ok(s) => f(s),
+        Err(_) => Err(io::Errno::INVAL),
+    }
+}
+
+/// The slow path which handles any length. In theory OS's only support up to
+/// `PATH_MAX`, but we let the OS enforce that.
+#[allow(unsafe_code, clippy::int_plus_one)]
+#[cold]
+fn with_c_str_slow_path<T, F>(bytes: &[u8], f: F) -> io::Result<T>
+where
+    F: FnOnce(&CStr) -> io::Result<T>,
+{
+    #[cfg(feature = "alloc")]
+    {
+        f(&CString::new(bytes).map_err(|_cstr_err| io::Errno::INVAL)?)
+    }
+
+    #[cfg(not(feature = "alloc"))]
+    {
+        #[cfg(all(libc, not(target_os = "wasi")))]
+        const LARGE_PATH_BUFFER_SIZE: usize = libc::PATH_MAX as usize;
+        #[cfg(linux_raw)]
+        const LARGE_PATH_BUFFER_SIZE: usize = linux_raw_sys::general::PATH_MAX as usize;
+        #[cfg(target_os = "wasi")]
+        const LARGE_PATH_BUFFER_SIZE: usize = 4096 as usize; // TODO: upstream this
+
+        // Taken from
+        // <https://github.com/rust-lang/rust/blob/a00f8ba7fcac1b27341679c51bf5a3271fa82df3/library/std/src/sys/common/small_c_string.rs>
+        let mut buf = MaybeUninit::<[u8; LARGE_PATH_BUFFER_SIZE]>::uninit();
+        let buf_ptr = buf.as_mut_ptr().cast::<u8>();
+
+        // This helps test our safety condition below.
+        if bytes.len() + 1 > LARGE_PATH_BUFFER_SIZE {
+            return Err(io::Errno::NAMETOOLONG);
+        }
+
+        // SAFETY: `bytes.len() < LARGE_PATH_BUFFER_SIZE` which means we have
+        // space for `bytes.len() + 1` u8s:
+        unsafe {
+            ptr::copy_nonoverlapping(bytes.as_ptr(), buf_ptr, bytes.len());
+            buf_ptr.add(bytes.len()).write(0);
+        }
+
+        // SAFETY: We just wrote the bytes above and they will remain valid for
+        // the duration of `f` b/c buf doesn't get dropped until the end of the
+        // function.
+        match CStr::from_bytes_with_nul(unsafe { slice::from_raw_parts(buf_ptr, bytes.len() + 1) })
+        {
+            Ok(s) => f(s),
+            Err(_) => Err(io::Errno::INVAL),
+        }
+    }
+}
diff --git a/vendor/rustix/src/path/dec_int.rs b/vendor/rustix/src/path/dec_int.rs
new file mode 100644
index 0000000..e9c46f4
--- /dev/null
+++ b/vendor/rustix/src/path/dec_int.rs
@@ -0,0 +1,120 @@
+//! Efficient decimal integer formatting.
+//!
+//! # Safety
+//!
+//! This uses `CStr::from_bytes_with_nul_unchecked` and
+//! `str::from_utf8_unchecked`on the buffer that it filled itself.
+#![allow(unsafe_code)]
+
+use crate::backend::fd::{AsFd, AsRawFd};
+use crate::ffi::CStr;
+use core::fmt::Write;
+use itoa::{Buffer, Integer};
+#[cfg(all(feature = "std", unix))]
+use std::os::unix::ffi::OsStrExt;
+#[cfg(all(feature = "std", target_os = "wasi"))]
+use std::os::wasi::ffi::OsStrExt;
+#[cfg(feature = "std")]
+use {core::fmt, std::ffi::OsStr, std::path::Path};
+
+/// Format an integer into a decimal `Path` component, without constructing a
+/// temporary `PathBuf` or `String`.
+///
+/// This is used for opening paths such as `/proc/self/fd/<fd>` on Linux.
+///
+/// # Examples
+///
+/// ```
+/// # #[cfg(any(feature = "fs", feature = "net"))]
+/// use rustix::path::DecInt;
+///
+/// # #[cfg(any(feature = "fs", feature = "net"))]
+/// assert_eq!(
+///     format!("hello {}", DecInt::new(9876).as_ref().display()),
+///     "hello 9876"
+/// );
+/// ```
+#[derive(Clone)]
+pub struct DecInt {
+    // 20 `u8`s is enough to hold the decimal ASCII representation of any
+    // `u64`, and we add one for a NUL terminator for `as_c_str`.
+    buf: [u8; 20 + 1],
+    len: usize,
+}
+
+impl DecInt {
+    /// Construct a new path component from an integer.
+    #[inline]
+    pub fn new<Int: Integer>(i: Int) -> Self {
+        let mut me = DecIntWriter(Self {
+            buf: [0; 20 + 1],
+            len: 0,
+        });
+        let mut buf = Buffer::new();
+        me.write_str(buf.format(i)).unwrap();
+        me.0
+    }
+
+    /// Construct a new path component from a file descriptor.
+    #[inline]
+    pub fn from_fd<Fd: AsFd>(fd: Fd) -> Self {
+        Self::new(fd.as_fd().as_raw_fd())
+    }
+
+    /// Return the raw byte buffer as a `&str`.
+    #[inline]
+    pub fn as_str(&self) -> &str {
+        // SAFETY: `DecInt` always holds a formatted decimal number, so it's
+        // always valid UTF-8.
+        unsafe { core::str::from_utf8_unchecked(self.as_bytes()) }
+    }
+
+    /// Return the raw byte buffer as a `&CStr`.
+    #[inline]
+    pub fn as_c_str(&self) -> &CStr {
+        let bytes_with_nul = &self.buf[..=self.len];
+        debug_assert!(CStr::from_bytes_with_nul(bytes_with_nul).is_ok());
+
+        // SAFETY: `self.buf` holds a single decimal ASCII representation and
+        // at least one extra NUL byte.
+        unsafe { CStr::from_bytes_with_nul_unchecked(bytes_with_nul) }
+    }
+
+    /// Return the raw byte buffer.
+    #[inline]
+    pub fn as_bytes(&self) -> &[u8] {
+        &self.buf[..self.len]
+    }
+}
+
+struct DecIntWriter(DecInt);
+
+impl core::fmt::Write for DecIntWriter {
+    #[inline]
+    fn write_str(&mut self, s: &str) -> core::fmt::Result {
+        match self.0.buf.get_mut(self.0.len..self.0.len + s.len()) {
+            Some(slice) => {
+                slice.copy_from_slice(s.as_bytes());
+                self.0.len += s.len();
+                Ok(())
+            }
+            None => Err(core::fmt::Error),
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+impl AsRef<Path> for DecInt {
+    #[inline]
+    fn as_ref(&self) -> &Path {
+        let as_os_str: &OsStr = OsStrExt::from_bytes(&self.buf[..self.len]);
+        Path::new(as_os_str)
+    }
+}
+
+#[cfg(feature = "std")]
+impl fmt::Debug for DecInt {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.as_str().fmt(fmt)
+    }
+}
diff --git a/vendor/rustix/src/path/mod.rs b/vendor/rustix/src/path/mod.rs
new file mode 100644
index 0000000..19bf2c7
--- /dev/null
+++ b/vendor/rustix/src/path/mod.rs
@@ -0,0 +1,12 @@
+//! Filesystem path operations.
+
+mod arg;
+#[cfg(feature = "itoa")]
+mod dec_int;
+
+pub use arg::Arg;
+#[cfg(feature = "itoa")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "itoa")))]
+pub use dec_int::DecInt;
+
+pub(crate) const SMALL_PATH_BUFFER_SIZE: usize = 256;
diff --git a/vendor/rustix/src/pid.rs b/vendor/rustix/src/pid.rs
new file mode 100644
index 0000000..5f2b9ad
--- /dev/null
+++ b/vendor/rustix/src/pid.rs
@@ -0,0 +1,104 @@
+//! The `Pid` type.
+
+#![allow(unsafe_code)]
+
+use crate::backend::c;
+use core::num::NonZeroI32;
+
+/// A process identifier as a raw integer.
+pub type RawPid = c::pid_t;
+
+/// `pid_t`—A non-zero Unix process ID.
+///
+/// This is a pid, and not a pidfd. It is not a file descriptor, and the
+/// process it refers to could disappear at any time and be replaced by
+/// another, unrelated, process.
+#[repr(transparent)]
+#[derive(Copy, Clone, Eq, PartialEq, Debug, Hash)]
+pub struct Pid(NonZeroI32);
+
+impl Pid {
+    /// A `Pid` corresponding to the init process (pid 1).
+    pub const INIT: Self = Self(match NonZeroI32::new(1) {
+        Some(n) => n,
+        None => panic!("unreachable"),
+    });
+
+    /// Converts a `RawPid` into a `Pid`.
+    ///
+    /// Returns `Some` for positive `RawPid`s. Otherwise, returns `None`.
+    ///
+    /// This is safe because a `Pid` is a number without any guarantees for the
+    /// kernel. Non-child `Pid`s are always racy for any syscalls, but can only
+    /// cause logic errors. If you want race-free access to or control of
+    /// non-child processes, please consider other mechanisms like [pidfd] on
+    /// Linux.
+    ///
+    /// [pidfd]: https://man7.org/linux/man-pages/man2/pidfd_open.2.html
+    #[inline]
+    pub const fn from_raw(raw: RawPid) -> Option<Self> {
+        if raw > 0 {
+            // SAFETY: We just checked that `raw > 0`.
+            unsafe { Some(Self::from_raw_unchecked(raw)) }
+        } else {
+            None
+        }
+    }
+
+    /// Converts a known positive `RawPid` into a `Pid`.
+    ///
+    /// # Safety
+    ///
+    /// The caller must guarantee `raw` is positive.
+    #[inline]
+    pub const unsafe fn from_raw_unchecked(raw: RawPid) -> Self {
+        debug_assert!(raw > 0);
+        Self(NonZeroI32::new_unchecked(raw))
+    }
+
+    /// Creates a `Pid` holding the ID of the given child process.
+    #[cfg(feature = "std")]
+    #[inline]
+    pub fn from_child(child: &std::process::Child) -> Self {
+        let id = child.id();
+        // SAFETY: We know the returned ID is valid because it came directly
+        // from an OS API.
+        unsafe { Self::from_raw_unchecked(id as i32) }
+    }
+
+    /// Converts a `Pid` into a `NonZeroI32`.
+    #[inline]
+    pub const fn as_raw_nonzero(self) -> NonZeroI32 {
+        self.0
+    }
+
+    /// Converts an `Option<Pid>` into a `RawPid`.
+    #[inline]
+    pub fn as_raw(pid: Option<Self>) -> RawPid {
+        pid.map_or(0, |pid| pid.0.get())
+    }
+
+    /// Test whether this pid represents the init process (pid 1).
+    #[inline]
+    pub const fn is_init(self) -> bool {
+        self.0.get() == Self::INIT.0.get()
+    }
+}
+
+#[test]
+fn test_sizes() {
+    use core::mem::transmute;
+
+    assert_eq_size!(RawPid, NonZeroI32);
+    assert_eq_size!(RawPid, Pid);
+    assert_eq_size!(RawPid, Option<Pid>);
+
+    // Rustix doesn't depend on `Option<Pid>` matching the ABI of a raw integer
+    // for correctness, but it should work nonetheless.
+    const_assert_eq!(0 as RawPid, unsafe {
+        transmute::<Option<Pid>, RawPid>(None)
+    });
+    const_assert_eq!(4567 as RawPid, unsafe {
+        transmute::<Option<Pid>, RawPid>(Some(Pid::from_raw_unchecked(4567)))
+    });
+}
diff --git a/vendor/rustix/src/pipe.rs b/vendor/rustix/src/pipe.rs
new file mode 100644
index 0000000..b0a9783
--- /dev/null
+++ b/vendor/rustix/src/pipe.rs
@@ -0,0 +1,220 @@
+//! `pipe` and related APIs.
+//!
+//! # Safety
+//!
+//! `vmsplice` is an unsafe function.
+
+#![allow(unsafe_code)]
+
+use crate::fd::OwnedFd;
+use crate::{backend, io};
+#[cfg(not(any(
+    solarish,
+    windows,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+use backend::c;
+#[cfg(linux_kernel)]
+use backend::fd::AsFd;
+
+#[cfg(not(apple))]
+pub use backend::pipe::types::PipeFlags;
+
+#[cfg(linux_kernel)]
+pub use backend::pipe::types::{IoSliceRaw, SpliceFlags};
+
+/// `PIPE_BUF`—The maximum length at which writes to a pipe are atomic.
+///
+/// # References
+///  - [Linux]
+///  - [POSIX]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man7/pipe.7.html
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/write.html
+#[cfg(not(any(
+    solarish,
+    windows,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "hurd",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+pub const PIPE_BUF: usize = c::PIPE_BUF;
+
+/// `pipe()`—Creates a pipe.
+///
+/// This function creates a pipe and returns two file descriptors, for the
+/// reading and writing ends of the pipe, respectively.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/pipe.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/pipe.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/pipe.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=pipe&sektion=2
+/// [NetBSD]: https://man.netbsd.org/pipe.2
+/// [OpenBSD]: https://man.openbsd.org/pipe.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=pipe&section=2
+/// [illumos]: https://illumos.org/man/2/pipe
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Creating-a-Pipe.html
+#[inline]
+pub fn pipe() -> io::Result<(OwnedFd, OwnedFd)> {
+    backend::pipe::syscalls::pipe()
+}
+
+/// `pipe2(flags)`—Creates a pipe, with flags.
+///
+/// This function creates a pipe and returns two file descriptors, for the
+/// reading and writing ends of the pipe, respectively.
+///
+/// # References
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/pipe2.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=pipe2&sektion=2
+/// [NetBSD]: https://man.netbsd.org/pipe2.2
+/// [OpenBSD]: https://man.openbsd.org/pipe2.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=pipe2&section=2
+/// [illumos]: https://illumos.org/man/2/pipe2
+#[cfg(not(any(
+    apple,
+    target_os = "aix",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "nto"
+)))]
+#[inline]
+#[doc(alias = "pipe2")]
+pub fn pipe_with(flags: PipeFlags) -> io::Result<(OwnedFd, OwnedFd)> {
+    backend::pipe::syscalls::pipe_with(flags)
+}
+
+/// `splice(fd_in, off_in, fd_out, off_out, len, flags)`—Transfer data
+/// between a file and a pipe.
+///
+/// This function transfers up to `len` bytes of data from the file descriptor
+/// `fd_in` to the file descriptor `fd_out`, where one of the file descriptors
+/// must refer to a pipe.
+///
+/// `off_*` must be `None` if the corresponding fd refers to a pipe. Otherwise
+/// its value points to the starting offset to the file, from which the data is
+/// read/written. On success, the number of bytes read/written is added to the
+/// offset.
+///
+/// Passing `None` causes the read/write to start from the file offset, and the
+/// file offset is adjusted appropriately.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/splice.2.html
+#[cfg(linux_kernel)]
+#[inline]
+pub fn splice<FdIn: AsFd, FdOut: AsFd>(
+    fd_in: FdIn,
+    off_in: Option<&mut u64>,
+    fd_out: FdOut,
+    off_out: Option<&mut u64>,
+    len: usize,
+    flags: SpliceFlags,
+) -> io::Result<usize> {
+    backend::pipe::syscalls::splice(fd_in.as_fd(), off_in, fd_out.as_fd(), off_out, len, flags)
+}
+
+/// `vmsplice(fd, bufs, flags)`—Transfer data between memory and a pipe.
+///
+/// If `fd` is the write end of the pipe, the function maps the memory pointer
+/// at by `bufs` to the pipe.
+///
+/// If `fd` is the read end of the pipe, the function writes data from the pipe
+/// to said memory.
+///
+/// # Safety
+///
+/// If the memory must not be mutated (such as when `bufs` were originally
+/// immutable slices), it is up to the caller to ensure that the write end of
+/// the pipe is placed in `fd`.
+///
+/// Additionally if `SpliceFlags::GIFT` is set, the caller must also ensure
+/// that the contents of `bufs` in never modified following the call, and that
+/// all of the pointers in `bufs` are page aligned, and the lengths are
+/// multiples of a page size in bytes.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/vmsplice.2.html
+#[cfg(linux_kernel)]
+#[inline]
+pub unsafe fn vmsplice<PipeFd: AsFd>(
+    fd: PipeFd,
+    bufs: &[IoSliceRaw<'_>],
+    flags: SpliceFlags,
+) -> io::Result<usize> {
+    backend::pipe::syscalls::vmsplice(fd.as_fd(), bufs, flags)
+}
+
+/// `tee(fd_in, fd_out, len, flags)`—Copy data between pipes without
+/// consuming it.
+///
+/// This reads up to `len` bytes from `in_fd` without consuming them, and
+/// writes them to `out_fd`.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/tee.2.html
+#[cfg(linux_kernel)]
+#[inline]
+pub fn tee<FdIn: AsFd, FdOut: AsFd>(
+    fd_in: FdIn,
+    fd_out: FdOut,
+    len: usize,
+    flags: SpliceFlags,
+) -> io::Result<usize> {
+    backend::pipe::syscalls::tee(fd_in.as_fd(), fd_out.as_fd(), len, flags)
+}
+
+/// `fnctl(fd, F_GETPIPE_SZ)`—Return the buffer capacity of a pipe.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
+#[cfg(linux_kernel)]
+#[inline]
+pub fn fcntl_getpipe_size<Fd: AsFd>(fd: Fd) -> io::Result<usize> {
+    backend::pipe::syscalls::fcntl_getpipe_sz(fd.as_fd())
+}
+
+/// `fnctl(fd, F_SETPIPE_SZ)`—Set the buffer capacity of a pipe.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
+#[cfg(linux_kernel)]
+#[inline]
+pub fn fcntl_setpipe_size<Fd: AsFd>(fd: Fd, size: usize) -> io::Result<()> {
+    backend::pipe::syscalls::fcntl_setpipe_sz(fd.as_fd(), size)
+}
diff --git a/vendor/rustix/src/prctl.rs b/vendor/rustix/src/prctl.rs
new file mode 100644
index 0000000..0ea8303
--- /dev/null
+++ b/vendor/rustix/src/prctl.rs
@@ -0,0 +1,71 @@
+//! Helper functions for `prctl` syscalls.
+
+#![allow(unsafe_code)]
+
+use crate::backend::c::{c_int, c_void};
+use crate::backend::prctl::syscalls;
+use crate::io;
+use crate::utils::as_mut_ptr;
+use bitflags::bitflags;
+use core::mem::MaybeUninit;
+use core::ptr::null_mut;
+
+bitflags! {
+    /// `PR_PAC_AP*`.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct PointerAuthenticationKeys: u32 {
+        /// `PR_PAC_APIAKEY`—Instruction authentication key `A`.
+        const INSTRUCTION_AUTHENTICATION_KEY_A = linux_raw_sys::prctl::PR_PAC_APIAKEY;
+        /// `PR_PAC_APIBKEY`—Instruction authentication key `B`.
+        const INSTRUCTION_AUTHENTICATION_KEY_B = linux_raw_sys::prctl::PR_PAC_APIBKEY;
+        /// `PR_PAC_APDAKEY`—Data authentication key `A`.
+        const DATA_AUTHENTICATION_KEY_A = linux_raw_sys::prctl::PR_PAC_APDAKEY;
+        /// `PR_PAC_APDBKEY`—Data authentication key `B`.
+        const DATA_AUTHENTICATION_KEY_B = linux_raw_sys::prctl::PR_PAC_APDBKEY;
+        /// `PR_PAC_APGAKEY`—Generic authentication `A` key.
+        const GENERIC_AUTHENTICATION_KEY_A = linux_raw_sys::prctl::PR_PAC_APGAKEY;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[inline]
+pub(crate) unsafe fn prctl_1arg(option: c_int) -> io::Result<c_int> {
+    const NULL: *mut c_void = null_mut();
+    syscalls::prctl(option, NULL, NULL, NULL, NULL)
+}
+
+#[inline]
+pub(crate) unsafe fn prctl_2args(option: c_int, arg2: *mut c_void) -> io::Result<c_int> {
+    const NULL: *mut c_void = null_mut();
+    syscalls::prctl(option, arg2, NULL, NULL, NULL)
+}
+
+#[inline]
+pub(crate) unsafe fn prctl_3args(
+    option: c_int,
+    arg2: *mut c_void,
+    arg3: *mut c_void,
+) -> io::Result<c_int> {
+    syscalls::prctl(option, arg2, arg3, null_mut(), null_mut())
+}
+
+#[inline]
+pub(crate) unsafe fn prctl_get_at_arg2_optional<P>(option: i32) -> io::Result<P> {
+    let mut value: MaybeUninit<P> = MaybeUninit::uninit();
+    prctl_2args(option, value.as_mut_ptr().cast())?;
+    Ok(value.assume_init())
+}
+
+#[inline]
+pub(crate) unsafe fn prctl_get_at_arg2<P, T>(option: i32) -> io::Result<T>
+where
+    P: Default,
+    T: TryFrom<P, Error = io::Errno>,
+{
+    let mut value: P = Default::default();
+    prctl_2args(option, as_mut_ptr(&mut value).cast())?;
+    TryFrom::try_from(value)
+}
diff --git a/vendor/rustix/src/process/chdir.rs b/vendor/rustix/src/process/chdir.rs
new file mode 100644
index 0000000..a68352f
--- /dev/null
+++ b/vendor/rustix/src/process/chdir.rs
@@ -0,0 +1,97 @@
+#[cfg(not(target_os = "fuchsia"))]
+use crate::backend::fd::AsFd;
+#[cfg(feature = "fs")]
+use crate::path;
+#[cfg(any(feature = "fs", not(target_os = "fuchsia")))]
+use crate::{backend, io};
+#[cfg(all(feature = "alloc", feature = "fs"))]
+use {
+    crate::ffi::{CStr, CString},
+    crate::path::SMALL_PATH_BUFFER_SIZE,
+    alloc::vec::Vec,
+};
+
+/// `chdir(path)`—Change the current working directory.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/chdir.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/chdir.2.html
+#[inline]
+#[cfg(feature = "fs")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "fs")))]
+pub fn chdir<P: path::Arg>(path: P) -> io::Result<()> {
+    path.into_with_c_str(backend::process::syscalls::chdir)
+}
+
+/// `fchdir(fd)`—Change the current working directory.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fchdir.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fchdir.2.html
+#[cfg(not(target_os = "fuchsia"))]
+#[inline]
+pub fn fchdir<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    backend::process::syscalls::fchdir(fd.as_fd())
+}
+
+/// `getCWD`—Return the current working directory.
+///
+/// If `reuse` already has available capacity, reuse it if possible.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getcwd.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/getcwd.3.html
+#[cfg(all(feature = "alloc", feature = "fs"))]
+#[cfg(not(target_os = "wasi"))]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "fs")))]
+#[inline]
+pub fn getcwd<B: Into<Vec<u8>>>(reuse: B) -> io::Result<CString> {
+    _getcwd(reuse.into())
+}
+
+#[cfg(all(feature = "alloc", feature = "fs"))]
+#[allow(unsafe_code)]
+fn _getcwd(mut buffer: Vec<u8>) -> io::Result<CString> {
+    buffer.clear();
+    buffer.reserve(SMALL_PATH_BUFFER_SIZE);
+
+    loop {
+        match backend::process::syscalls::getcwd(buffer.spare_capacity_mut()) {
+            Err(io::Errno::RANGE) => {
+                // Use `Vec` reallocation strategy to grow capacity
+                // exponentially.
+                buffer.reserve(buffer.capacity() + 1);
+            }
+            Ok(_) => {
+                // SAFETY:
+                // - "These functions return a null-terminated string"
+                // - [POSIX definition 3.375: String]: "A contiguous sequence
+                //   of bytes terminated by and including the first null byte."
+                //
+                // Thus, there will be a single NUL byte at the end of the
+                // string.
+                //
+                // [POSIX definition 3.375: String]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_375
+                unsafe {
+                    buffer.set_len(
+                        CStr::from_ptr(buffer.as_ptr().cast())
+                            .to_bytes_with_nul()
+                            .len(),
+                    );
+
+                    return Ok(CString::from_vec_with_nul_unchecked(buffer));
+                }
+            }
+            Err(errno) => return Err(errno),
+        }
+    }
+}
diff --git a/vendor/rustix/src/process/chroot.rs b/vendor/rustix/src/process/chroot.rs
new file mode 100644
index 0000000..a4fd8d8
--- /dev/null
+++ b/vendor/rustix/src/process/chroot.rs
@@ -0,0 +1,16 @@
+#[cfg(feature = "fs")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "fs")))]
+use crate::{backend, io, path};
+
+/// `chroot(path)`—Change the process root directory.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/chroot.2.html
+#[cfg(feature = "fs")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "fs")))]
+#[inline]
+pub fn chroot<P: path::Arg>(path: P) -> io::Result<()> {
+    path.into_with_c_str(backend::process::syscalls::chroot)
+}
diff --git a/vendor/rustix/src/process/exit.rs b/vendor/rustix/src/process/exit.rs
new file mode 100644
index 0000000..95b78c4
--- /dev/null
+++ b/vendor/rustix/src/process/exit.rs
@@ -0,0 +1,36 @@
+use crate::backend;
+
+/// `EXIT_SUCCESS` for use with [`exit`].
+///
+/// [`exit`]: std::process::exit
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stdlib.h.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/exit.3.html
+pub const EXIT_SUCCESS: i32 = backend::c::EXIT_SUCCESS;
+
+/// `EXIT_FAILURE` for use with [`exit`].
+///
+/// [`exit`]: std::process::exit
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stdlib.h.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/exit.3.html
+pub const EXIT_FAILURE: i32 = backend::c::EXIT_FAILURE;
+
+/// The exit status used by a process terminated with a [`Signal::Abort`]
+/// signal.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://tldp.org/LDP/abs/html/exitcodes.html
+/// [`Signal::Abort`]: crate::process::Signal::Abort
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+pub const EXIT_SIGNALED_SIGABRT: i32 = backend::c::EXIT_SIGNALED_SIGABRT;
diff --git a/vendor/rustix/src/process/id.rs b/vendor/rustix/src/process/id.rs
new file mode 100644
index 0000000..1a49dc5
--- /dev/null
+++ b/vendor/rustix/src/process/id.rs
@@ -0,0 +1,232 @@
+//! Unix user, group, and process identifiers.
+//!
+//! # Safety
+//!
+//! The `Uid`, `Gid`, and `Pid` types can be constructed from raw integers,
+//! which is marked unsafe because actual OS's assign special meaning to some
+//! integer values.
+#![allow(unsafe_code)]
+
+use crate::{backend, io};
+#[cfg(feature = "alloc")]
+use alloc::vec::Vec;
+#[cfg(linux_kernel)]
+use backend::process::types::RawCpuid;
+
+/// The raw integer value of a Unix user ID.
+pub use crate::ugid::RawUid;
+
+/// The raw integer value of a Unix group ID.
+pub use crate::ugid::RawGid;
+
+/// The raw integer value of a Unix process ID.
+pub use crate::pid::RawPid;
+
+pub use crate::pid::Pid;
+pub use crate::ugid::{Gid, Uid};
+
+/// A Linux CPU ID.
+#[cfg(linux_kernel)]
+#[repr(transparent)]
+#[derive(Copy, Clone, Eq, PartialEq, Debug, Hash)]
+pub struct Cpuid(RawCpuid);
+
+#[cfg(linux_kernel)]
+impl Cpuid {
+    /// Converts a `RawCpuid` into a `Cpuid`.
+    ///
+    /// # Safety
+    ///
+    /// `raw` must be the value of a valid Linux CPU ID.
+    #[inline]
+    pub const unsafe fn from_raw(raw: RawCpuid) -> Self {
+        Self(raw)
+    }
+
+    /// Converts a `Cpuid` into a `RawCpuid`.
+    #[inline]
+    pub const fn as_raw(self) -> RawCpuid {
+        self.0
+    }
+}
+
+/// `getuid()`—Returns the process' real user ID.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getuid.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/getuid.2.html
+#[inline]
+#[must_use]
+pub fn getuid() -> Uid {
+    backend::ugid::syscalls::getuid()
+}
+
+/// `geteuid()`—Returns the process' effective user ID.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/geteuid.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/geteuid.2.html
+#[inline]
+#[must_use]
+pub fn geteuid() -> Uid {
+    backend::ugid::syscalls::geteuid()
+}
+
+/// `getgid()`—Returns the process' real group ID.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getgid.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/getgid.2.html
+#[inline]
+#[must_use]
+pub fn getgid() -> Gid {
+    backend::ugid::syscalls::getgid()
+}
+
+/// `getegid()`—Returns the process' effective group ID.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getegid.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/getegid.2.html
+#[inline]
+#[must_use]
+pub fn getegid() -> Gid {
+    backend::ugid::syscalls::getegid()
+}
+
+/// `getpid()`—Returns the process' ID.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getpid.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/getpid.2.html
+#[inline]
+#[must_use]
+pub fn getpid() -> Pid {
+    backend::pid::syscalls::getpid()
+}
+
+/// `getppid()`—Returns the parent process' ID.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getppid.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/getppid.2.html
+#[inline]
+#[must_use]
+pub fn getppid() -> Option<Pid> {
+    backend::process::syscalls::getppid()
+}
+
+/// `getpgid(pid)`—Returns the process group ID of the given process.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getpgid.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/getpgid.2.html
+#[inline]
+pub fn getpgid(pid: Option<Pid>) -> io::Result<Pid> {
+    backend::process::syscalls::getpgid(pid)
+}
+
+/// `setpgid(pid, pgid)`—Sets the process group ID of the given process.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setpgid.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/setpgid.2.html
+#[inline]
+pub fn setpgid(pid: Option<Pid>, pgid: Option<Pid>) -> io::Result<()> {
+    backend::process::syscalls::setpgid(pid, pgid)
+}
+
+/// `getpgrp()`—Returns the process' group ID.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getpgrp.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/getpgrp.2.html
+#[inline]
+#[must_use]
+pub fn getpgrp() -> Pid {
+    backend::process::syscalls::getpgrp()
+}
+
+/// `getsid(pid)`—Get the session ID of the given process.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsid.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/getsid.2.html
+#[cfg(not(target_os = "redox"))]
+#[inline]
+pub fn getsid(pid: Option<Pid>) -> io::Result<Pid> {
+    backend::process::syscalls::getsid(pid)
+}
+
+/// `setsid()`—Create a new session.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsid.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/setsid.2.html
+#[inline]
+pub fn setsid() -> io::Result<Pid> {
+    backend::process::syscalls::setsid()
+}
+
+/// `getgroups()`—Return a list of the current user's groups.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getgroups.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/getgroups.2.html
+#[cfg(feature = "alloc")]
+pub fn getgroups() -> io::Result<Vec<Gid>> {
+    // This code would benefit from having a better way to read into
+    // uninitialized memory, but that requires `unsafe`.
+    let mut buffer = Vec::with_capacity(8);
+    buffer.resize(buffer.capacity(), Gid::ROOT);
+
+    loop {
+        let ngroups = backend::process::syscalls::getgroups(&mut buffer)?;
+
+        let ngroups = ngroups as usize;
+        assert!(ngroups <= buffer.len());
+        if ngroups < buffer.len() {
+            buffer.resize(ngroups, Gid::ROOT);
+            return Ok(buffer);
+        }
+        // Use `Vec` reallocation strategy to grow capacity exponentially.
+        buffer.reserve(1);
+        buffer.resize(buffer.capacity(), Gid::ROOT);
+    }
+}
diff --git a/vendor/rustix/src/process/ioctl.rs b/vendor/rustix/src/process/ioctl.rs
new file mode 100644
index 0000000..5afc766
--- /dev/null
+++ b/vendor/rustix/src/process/ioctl.rs
@@ -0,0 +1,52 @@
+//! Process-oriented `ioctl`s.
+//!
+//! # Safety
+//!
+//! This module invokes `ioctl`s.
+
+#![allow(unsafe_code)]
+
+use crate::{backend, io, ioctl};
+use backend::c;
+use backend::fd::AsFd;
+
+/// `ioctl(fd, TIOCSCTTY, 0)`—Sets the controlling terminal for the process.
+///
+/// # References
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man4/tty_ioctl.4.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=tty&sektion=4
+/// [NetBSD]: https://man.netbsd.org/tty.4
+/// [OpenBSD]: https://man.openbsd.org/tty.4
+#[cfg(not(any(windows, target_os = "aix", target_os = "redox", target_os = "wasi")))]
+#[inline]
+#[doc(alias = "TIOCSCTTY")]
+pub fn ioctl_tiocsctty<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    unsafe { ioctl::ioctl(fd, Tiocsctty) }
+}
+
+#[cfg(not(any(windows, target_os = "aix", target_os = "redox", target_os = "wasi")))]
+struct Tiocsctty;
+
+#[cfg(not(any(windows, target_os = "aix", target_os = "redox", target_os = "wasi")))]
+unsafe impl ioctl::Ioctl for Tiocsctty {
+    type Output = ();
+
+    const IS_MUTATING: bool = false;
+    const OPCODE: ioctl::Opcode = ioctl::Opcode::old(c::TIOCSCTTY as ioctl::RawOpcode);
+
+    fn as_ptr(&mut self) -> *mut c::c_void {
+        (&0u32) as *const u32 as *mut c::c_void
+    }
+
+    unsafe fn output_from_ptr(
+        _: ioctl::IoctlOutput,
+        _: *mut c::c_void,
+    ) -> io::Result<Self::Output> {
+        Ok(())
+    }
+}
diff --git a/vendor/rustix/src/process/kill.rs b/vendor/rustix/src/process/kill.rs
new file mode 100644
index 0000000..01d5380
--- /dev/null
+++ b/vendor/rustix/src/process/kill.rs
@@ -0,0 +1,97 @@
+use crate::process::Pid;
+use crate::{backend, io};
+
+pub use crate::signal::Signal;
+
+/// `kill(pid, sig)`—Sends a signal to a process.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/kill.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/kill.2.html
+#[inline]
+#[doc(alias = "kill")]
+pub fn kill_process(pid: Pid, sig: Signal) -> io::Result<()> {
+    backend::process::syscalls::kill_process(pid, sig)
+}
+
+/// `kill(-pid, sig)`—Sends a signal to all processes in a process group.
+///
+/// If `pid` is 1, this sends a signal to all processes the current process has
+/// permission to send signals to, except process `1`, possibly other
+/// system-specific processes, and on some systems, the current process.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/kill.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/kill.2.html
+#[inline]
+#[doc(alias = "kill")]
+pub fn kill_process_group(pid: Pid, sig: Signal) -> io::Result<()> {
+    backend::process::syscalls::kill_process_group(pid, sig)
+}
+
+/// `kill(0, sig)`—Sends a signal to all processes in the current process
+/// group.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/kill.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/kill.2.html
+#[inline]
+#[doc(alias = "kill")]
+pub fn kill_current_process_group(sig: Signal) -> io::Result<()> {
+    backend::process::syscalls::kill_current_process_group(sig)
+}
+
+/// `kill(pid, 0)`—Check validity of pid and permissions to send signals to
+/// the process, without actually sending any signals.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/kill.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/kill.2.html
+#[inline]
+#[doc(alias = "kill")]
+pub fn test_kill_process(pid: Pid) -> io::Result<()> {
+    backend::process::syscalls::test_kill_process(pid)
+}
+
+/// `kill(-pid, 0)`—Check validity of pid and permissions to send signals to
+/// all processes in the process group, without actually sending any signals.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/kill.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/kill.2.html
+#[inline]
+#[doc(alias = "kill")]
+pub fn test_kill_process_group(pid: Pid) -> io::Result<()> {
+    backend::process::syscalls::test_kill_process_group(pid)
+}
+
+/// `kill(0, 0)`—Check validity of pid and permissions to send signals to the
+/// all processes in the current process group, without actually sending any
+/// signals.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/kill.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/kill.2.html
+#[inline]
+#[doc(alias = "kill")]
+pub fn test_kill_current_process_group() -> io::Result<()> {
+    backend::process::syscalls::test_kill_current_process_group()
+}
diff --git a/vendor/rustix/src/process/membarrier.rs b/vendor/rustix/src/process/membarrier.rs
new file mode 100644
index 0000000..26be07d
--- /dev/null
+++ b/vendor/rustix/src/process/membarrier.rs
@@ -0,0 +1,92 @@
+//! The Linux `membarrier` syscall.
+
+use crate::process::Cpuid;
+use crate::{backend, io};
+
+pub use backend::process::types::MembarrierCommand;
+
+#[cfg(linux_kernel)]
+bitflags::bitflags! {
+    /// A result from [`membarrier_query`].
+    ///
+    /// These flags correspond to values of [`MembarrierCommand`] which are
+    /// supported in the OS.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct MembarrierQuery: u32 {
+        /// `MEMBARRIER_CMD_GLOBAL` (also known as `MEMBARRIER_CMD_SHARED`)
+        #[doc(alias = "SHARED")]
+        #[doc(alias = "MEMBARRIER_CMD_SHARED")]
+        const GLOBAL = MembarrierCommand::Global as _;
+        /// `MEMBARRIER_CMD_GLOBAL_EXPEDITED`
+        const GLOBAL_EXPEDITED = MembarrierCommand::GlobalExpedited as _;
+        /// `MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED`
+        const REGISTER_GLOBAL_EXPEDITED = MembarrierCommand::RegisterGlobalExpedited as _;
+        /// `MEMBARRIER_CMD_PRIVATE_EXPEDITED`
+        const PRIVATE_EXPEDITED = MembarrierCommand::PrivateExpedited as _;
+        /// `MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED`
+        const REGISTER_PRIVATE_EXPEDITED = MembarrierCommand::RegisterPrivateExpedited as _;
+        /// `MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE`
+        const PRIVATE_EXPEDITED_SYNC_CORE = MembarrierCommand::PrivateExpeditedSyncCore as _;
+        /// `MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE`
+        const REGISTER_PRIVATE_EXPEDITED_SYNC_CORE = MembarrierCommand::RegisterPrivateExpeditedSyncCore as _;
+        /// `MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ` (since Linux 5.10)
+        const PRIVATE_EXPEDITED_RSEQ = MembarrierCommand::PrivateExpeditedRseq as _;
+        /// `MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_RSEQ` (since Linux 5.10)
+        const REGISTER_PRIVATE_EXPEDITED_RSEQ = MembarrierCommand::RegisterPrivateExpeditedRseq as _;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(linux_kernel)]
+impl MembarrierQuery {
+    /// Test whether this query result contains the given command.
+    #[inline]
+    pub fn contains_command(self, cmd: MembarrierCommand) -> bool {
+        // `MembarrierCommand` is an enum that only contains values also valid
+        // in `MembarrierQuery`.
+        self.contains(Self::from_bits_retain(cmd as _))
+    }
+}
+
+/// `membarrier(MEMBARRIER_CMD_QUERY, 0, 0)`—Query the supported `membarrier`
+/// commands.
+///
+/// This function doesn't return a `Result` because it always succeeds; if the
+/// underlying OS doesn't support the `membarrier` syscall, it returns an empty
+/// `MembarrierQuery` value.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/membarrier.2.html
+#[inline]
+#[doc(alias = "MEMBARRIER_CMD_QUERY")]
+pub fn membarrier_query() -> MembarrierQuery {
+    backend::process::syscalls::membarrier_query()
+}
+
+/// `membarrier(cmd, 0, 0)`—Perform a memory barrier.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/membarrier.2.html
+#[inline]
+pub fn membarrier(cmd: MembarrierCommand) -> io::Result<()> {
+    backend::process::syscalls::membarrier(cmd)
+}
+
+/// `membarrier(cmd, MEMBARRIER_CMD_FLAG_CPU, cpu)`—Perform a memory barrier
+/// with a specific CPU.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/membarrier.2.html
+#[inline]
+pub fn membarrier_cpu(cmd: MembarrierCommand, cpu: Cpuid) -> io::Result<()> {
+    backend::process::syscalls::membarrier_cpu(cmd, cpu)
+}
diff --git a/vendor/rustix/src/process/mod.rs b/vendor/rustix/src/process/mod.rs
new file mode 100644
index 0000000..5fbc1f3
--- /dev/null
+++ b/vendor/rustix/src/process/mod.rs
@@ -0,0 +1,80 @@
+//! Process-associated operations.
+
+#[cfg(not(target_os = "wasi"))]
+mod chdir;
+#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))]
+mod chroot;
+mod exit;
+#[cfg(not(target_os = "wasi"))] // WASI doesn't have get[gpu]id.
+mod id;
+#[cfg(not(any(target_os = "aix", target_os = "espidf", target_os = "vita")))]
+mod ioctl;
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+mod kill;
+#[cfg(linux_kernel)]
+mod membarrier;
+#[cfg(target_os = "linux")]
+mod pidfd;
+#[cfg(target_os = "linux")]
+mod pidfd_getfd;
+#[cfg(linux_kernel)]
+mod prctl;
+#[cfg(not(any(target_os = "fuchsia", target_os = "vita", target_os = "wasi")))]
+// WASI doesn't have [gs]etpriority.
+mod priority;
+#[cfg(freebsdlike)]
+mod procctl;
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+mod rlimit;
+#[cfg(any(freebsdlike, linux_kernel, target_os = "fuchsia"))]
+mod sched;
+mod sched_yield;
+#[cfg(not(target_os = "wasi"))] // WASI doesn't have umask.
+mod umask;
+#[cfg(not(any(target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+mod wait;
+
+#[cfg(not(target_os = "wasi"))]
+pub use chdir::*;
+#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))]
+pub use chroot::*;
+pub use exit::*;
+#[cfg(not(target_os = "wasi"))]
+pub use id::*;
+#[cfg(not(any(target_os = "aix", target_os = "espidf", target_os = "vita")))]
+pub use ioctl::*;
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+pub use kill::*;
+#[cfg(linux_kernel)]
+pub use membarrier::*;
+#[cfg(target_os = "linux")]
+pub use pidfd::*;
+#[cfg(target_os = "linux")]
+pub use pidfd_getfd::*;
+#[cfg(linux_kernel)]
+pub use prctl::*;
+#[cfg(not(any(target_os = "fuchsia", target_os = "vita", target_os = "wasi")))]
+pub use priority::*;
+#[cfg(freebsdlike)]
+pub use procctl::*;
+#[cfg(not(any(
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+pub use rlimit::*;
+#[cfg(any(freebsdlike, linux_kernel, target_os = "fuchsia"))]
+pub use sched::*;
+pub use sched_yield::sched_yield;
+#[cfg(not(target_os = "wasi"))]
+pub use umask::*;
+#[cfg(not(any(target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+pub use wait::*;
diff --git a/vendor/rustix/src/process/pidfd.rs b/vendor/rustix/src/process/pidfd.rs
new file mode 100644
index 0000000..abebaf2
--- /dev/null
+++ b/vendor/rustix/src/process/pidfd.rs
@@ -0,0 +1,30 @@
+use crate::fd::OwnedFd;
+use crate::process::Pid;
+use crate::{backend, io};
+
+bitflags::bitflags! {
+    /// `PIDFD_*` flags for use with [`pidfd_open`].
+    ///
+    /// [`pidfd_open`]: crate::process::pidfd_open
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct PidfdFlags: backend::c::c_uint {
+        /// `PIDFD_NONBLOCK`.
+        const NONBLOCK = backend::c::PIDFD_NONBLOCK;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `syscall(SYS_pidfd_open, pid, flags)`—Creates a file descriptor for a
+/// process.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/pidfd_open.2.html
+#[inline]
+pub fn pidfd_open(pid: Pid, flags: PidfdFlags) -> io::Result<OwnedFd> {
+    backend::process::syscalls::pidfd_open(pid, flags)
+}
diff --git a/vendor/rustix/src/process/pidfd_getfd.rs b/vendor/rustix/src/process/pidfd_getfd.rs
new file mode 100644
index 0000000..4c7696f
--- /dev/null
+++ b/vendor/rustix/src/process/pidfd_getfd.rs
@@ -0,0 +1,56 @@
+//! The [`pidfd_getfd`] function and supporting types.
+
+#![allow(unsafe_code)]
+use crate::fd::OwnedFd;
+use crate::{backend, io};
+use backend::fd::{AsFd, RawFd};
+
+/// Raw file descriptor in another process.
+///
+/// A distinct type alias is used here to inform the user that normal file
+/// descriptors from the calling process should not be used. The provided file
+/// descriptor is used by the kernel as the index into the file descriptor
+/// table of an entirely different process.
+pub type ForeignRawFd = RawFd;
+
+bitflags::bitflags! {
+    /// All flags are reserved for future use.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct PidfdGetfdFlags: backend::c::c_uint {
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `syscall(SYS_pidfd_getfd, pidfd, flags)`—Obtain a duplicate of another
+/// process' file descriptor.
+///
+/// # References
+///  - [Linux]
+///
+/// # Warning
+///
+/// This function is generally safe for the calling process, but it can impact
+/// the target process in unexpected ways. If you want to ensure that Rust I/O
+/// safety assumptions continue to hold in the target process, then the target
+/// process must have communicated the file description number to the calling
+/// process from a value of a type that implements `AsRawFd`, and the target
+/// process must not drop that value until after the calling process has
+/// returned from `pidfd_getfd`.
+///
+/// When `pidfd_getfd` is used to debug the target, or the target is not a Rust
+/// aplication, or `pidfd_getfd` is used in any other way, then extra care
+/// should be taken to avoid unexpected behaviour or crashes.
+///
+/// For further details, see the references above.
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/pidfd_getfd.2.html
+#[inline]
+pub fn pidfd_getfd<Fd: AsFd>(
+    pidfd: Fd,
+    targetfd: ForeignRawFd,
+    flags: PidfdGetfdFlags,
+) -> io::Result<OwnedFd> {
+    backend::process::syscalls::pidfd_getfd(pidfd.as_fd(), targetfd, flags)
+}
diff --git a/vendor/rustix/src/process/prctl.rs b/vendor/rustix/src/process/prctl.rs
new file mode 100644
index 0000000..830abc1
--- /dev/null
+++ b/vendor/rustix/src/process/prctl.rs
@@ -0,0 +1,1151 @@
+//! Bindings for the Linux `prctl` system call.
+//!
+//! There are similarities (but also differences) with FreeBSD's `procctl`
+//! system call, whose interface is located in the `procctl.rs` file.
+
+#![allow(unsafe_code)]
+
+use core::mem::size_of;
+use core::ptr::{null, null_mut, NonNull};
+
+use bitflags::bitflags;
+
+use crate::backend::c::{c_int, c_uint, c_void};
+use crate::backend::prctl::syscalls;
+use crate::fd::{AsRawFd, BorrowedFd};
+use crate::ffi::CStr;
+use crate::io;
+use crate::prctl::*;
+use crate::process::{Pid, RawPid};
+use crate::signal::Signal;
+use crate::utils::{as_mut_ptr, as_ptr};
+
+//
+// PR_GET_PDEATHSIG/PR_SET_PDEATHSIG
+//
+
+const PR_GET_PDEATHSIG: c_int = 2;
+
+/// Get the current value of the parent process death signal.
+///
+/// # References
+///  - [Linux: `prctl(PR_GET_PDEATHSIG,...)`]
+///  - [FreeBSD: `procctl(PROC_PDEATHSIG_STATUS,...)`]
+///
+/// [Linux: `prctl(PR_GET_PDEATHSIG,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+/// [FreeBSD: `procctl(PROC_PDEATHSIG_STATUS,...)`]: https://man.freebsd.org/cgi/man.cgi?query=procctl&sektion=2
+#[inline]
+#[doc(alias = "PR_GET_PDEATHSIG")]
+pub fn parent_process_death_signal() -> io::Result<Option<Signal>> {
+    unsafe { prctl_get_at_arg2_optional::<c_int>(PR_GET_PDEATHSIG) }.map(Signal::from_raw)
+}
+
+const PR_SET_PDEATHSIG: c_int = 1;
+
+/// Set the parent-death signal of the calling process.
+///
+/// # References
+///  - [Linux: `prctl(PR_SET_PDEATHSIG,...)`]
+///  - [FreeBSD: `procctl(PROC_PDEATHSIG_CTL,...)`]
+///
+/// [Linux: `prctl(PR_SET_PDEATHSIG,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+/// [FreeBSD: `procctl(PROC_PDEATHSIG_CTL,...)`]: https://man.freebsd.org/cgi/man.cgi?query=procctl&sektion=2
+#[inline]
+#[doc(alias = "PR_SET_PDEATHSIG")]
+pub fn set_parent_process_death_signal(signal: Option<Signal>) -> io::Result<()> {
+    let signal = signal.map_or(0_usize, |signal| signal as usize);
+    unsafe { prctl_2args(PR_SET_PDEATHSIG, signal as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_GET_DUMPABLE/PR_SET_DUMPABLE
+//
+
+const PR_GET_DUMPABLE: c_int = 3;
+
+const SUID_DUMP_DISABLE: i32 = 0;
+const SUID_DUMP_USER: i32 = 1;
+const SUID_DUMP_ROOT: i32 = 2;
+
+/// `SUID_DUMP_*` values for use with [`dumpable_behavior`] and
+/// [`set_dumpable_behavior`].
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(i32)]
+pub enum DumpableBehavior {
+    /// Not dumpable.
+    #[doc(alias = "SUID_DUMP_DISABLE")]
+    NotDumpable = SUID_DUMP_DISABLE,
+    /// Dumpable.
+    #[doc(alias = "SUID_DUMP_USER")]
+    Dumpable = SUID_DUMP_USER,
+    /// Dumpable but only readable by root.
+    #[doc(alias = "SUID_DUMP_ROOT")]
+    DumpableReadableOnlyByRoot = SUID_DUMP_ROOT,
+}
+
+impl TryFrom<i32> for DumpableBehavior {
+    type Error = io::Errno;
+
+    fn try_from(value: i32) -> Result<Self, Self::Error> {
+        match value {
+            SUID_DUMP_DISABLE => Ok(Self::NotDumpable),
+            SUID_DUMP_USER => Ok(Self::Dumpable),
+            SUID_DUMP_ROOT => Ok(Self::DumpableReadableOnlyByRoot),
+            _ => Err(io::Errno::RANGE),
+        }
+    }
+}
+
+/// Get the current state of the calling process' `dumpable` attribute.
+///
+/// # References
+///  - [`prctl(PR_GET_DUMPABLE,...)`]
+///
+/// [`prctl(PR_GET_DUMPABLE,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_GET_DUMPABLE")]
+pub fn dumpable_behavior() -> io::Result<DumpableBehavior> {
+    unsafe { prctl_1arg(PR_GET_DUMPABLE) }.and_then(TryInto::try_into)
+}
+
+const PR_SET_DUMPABLE: c_int = 4;
+
+/// Set the state of the `dumpable` attribute, which determines whether the
+/// process can be traced and whether core dumps are produced for the calling
+/// process upon delivery of a signal whose default behavior is to produce a
+/// core dump.
+///
+/// A similar function with the same name is available on FreeBSD (as part of
+/// the `procctl` interface), but it has an extra argument which allows to
+/// select a process other then the current process.
+///
+/// # References
+///  - [`prctl(PR_SET_DUMPABLE,...)`]
+///
+/// [`prctl(PR_SET_DUMPABLE,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_DUMPABLE")]
+pub fn set_dumpable_behavior(config: DumpableBehavior) -> io::Result<()> {
+    unsafe { prctl_2args(PR_SET_DUMPABLE, config as usize as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_GET_UNALIGN/PR_SET_UNALIGN
+//
+
+const PR_GET_UNALIGN: c_int = 5;
+
+bitflags! {
+    /// `PR_UNALIGN_*` flags for use with [`unaligned_access_control`] and
+    /// [`set_unaligned_access_control`].
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct UnalignedAccessControl: u32 {
+        /// Silently fix up unaligned user accesses.
+        #[doc(alias = "NOPRINT")]
+        #[doc(alias = "PR_UNALIGN_NOPRINT")]
+        const NO_PRINT = 1;
+        /// Generate a [`Signal::Bus`] signal on unaligned user access.
+        #[doc(alias = "PR_UNALIGN_SIGBUS")]
+        const SIGBUS = 2;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// Get unaligned access control bits.
+///
+/// # References
+///  - [`prctl(PR_GET_UNALIGN,...)`]
+///
+/// [`prctl(PR_GET_UNALIGN,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_GET_UNALIGN")]
+pub fn unaligned_access_control() -> io::Result<UnalignedAccessControl> {
+    let r = unsafe { prctl_get_at_arg2_optional::<c_uint>(PR_GET_UNALIGN)? };
+    UnalignedAccessControl::from_bits(r).ok_or(io::Errno::RANGE)
+}
+
+const PR_SET_UNALIGN: c_int = 6;
+
+/// Set unaligned access control bits.
+///
+/// # References
+///  - [`prctl(PR_SET_UNALIGN,...)`]
+///
+/// [`prctl(PR_SET_UNALIGN,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_UNALIGN")]
+pub fn set_unaligned_access_control(config: UnalignedAccessControl) -> io::Result<()> {
+    unsafe { prctl_2args(PR_SET_UNALIGN, config.bits() as usize as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_GET_FPEMU/PR_SET_FPEMU
+//
+
+const PR_GET_FPEMU: c_int = 9;
+
+bitflags! {
+    /// `PR_FPEMU_*` flags for use with [`floating_point_emulation_control`]
+    /// and [`set_floating_point_emulation_control`].
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct FloatingPointEmulationControl: u32 {
+        /// Silently emulate floating point operations accesses.
+        #[doc(alias = "PR_UNALIGN_NOPRINT")]
+        const NO_PRINT = 1;
+        /// Don't emulate floating point operations, send a [`Signal::Fpe`]
+        /// signal instead.
+        #[doc(alias = "PR_UNALIGN_SIGFPE")]
+        const SIGFPE = 2;
+    }
+}
+
+/// Get floating point emulation control bits.
+///
+/// # References
+///  - [`prctl(PR_GET_FPEMU,...)`]
+///
+/// [`prctl(PR_GET_FPEMU,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_GET_FPEMU")]
+pub fn floating_point_emulation_control() -> io::Result<FloatingPointEmulationControl> {
+    let r = unsafe { prctl_get_at_arg2_optional::<c_uint>(PR_GET_FPEMU)? };
+    FloatingPointEmulationControl::from_bits(r).ok_or(io::Errno::RANGE)
+}
+
+const PR_SET_FPEMU: c_int = 10;
+
+/// Set floating point emulation control bits.
+///
+/// # References
+///  - [`prctl(PR_SET_FPEMU,...)`]
+///
+/// [`prctl(PR_SET_FPEMU,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_FPEMU")]
+pub fn set_floating_point_emulation_control(
+    config: FloatingPointEmulationControl,
+) -> io::Result<()> {
+    unsafe { prctl_2args(PR_SET_FPEMU, config.bits() as usize as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_GET_FPEXC/PR_SET_FPEXC
+//
+
+const PR_GET_FPEXC: c_int = 11;
+
+bitflags! {
+    /// Zero means floating point exceptions are disabled.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct FloatingPointExceptionMode: u32 {
+        /// Async non-recoverable exception mode.
+        const NONRECOV = 1;
+        /// Async recoverable exception mode.
+        const ASYNC = 2;
+        /// Precise exception mode.
+        const PRECISE = 3;
+
+        /// Use FPEXC for floating point exception enables.
+        const SW_ENABLE = 0x80;
+        /// Floating point divide by zero.
+        const DIV = 0x01_0000;
+        /// Floating point overflow.
+        const OVF = 0x02_0000;
+        /// Floating point underflow.
+        const UND = 0x04_0000;
+        /// Floating point inexact result.
+        const RES = 0x08_0000;
+        /// Floating point invalid operation.
+        const INV = 0x10_0000;
+    }
+}
+
+/// Get floating point exception mode.
+///
+/// # References
+///  - [`prctl(PR_GET_FPEXC,...)`]
+///
+/// [`prctl(PR_GET_FPEXC,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_GET_FPEXEC")]
+pub fn floating_point_exception_mode() -> io::Result<Option<FloatingPointExceptionMode>> {
+    unsafe { prctl_get_at_arg2_optional::<c_uint>(PR_GET_FPEXC) }
+        .map(FloatingPointExceptionMode::from_bits)
+}
+
+const PR_SET_FPEXC: c_int = 12;
+
+/// Set floating point exception mode.
+///
+/// # References
+///  - [`prctl(PR_SET_FPEXC,...)`]
+///
+/// [`prctl(PR_SET_FPEXC,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_FPEXEC")]
+pub fn set_floating_point_exception_mode(
+    config: Option<FloatingPointExceptionMode>,
+) -> io::Result<()> {
+    let config = config.as_ref().map_or(0, FloatingPointExceptionMode::bits);
+    unsafe { prctl_2args(PR_SET_FPEXC, config as usize as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_GET_TIMING/PR_SET_TIMING
+//
+
+const PR_GET_TIMING: c_int = 13;
+
+const PR_TIMING_STATISTICAL: i32 = 0;
+const PR_TIMING_TIMESTAMP: i32 = 1;
+
+/// `PR_TIMING_*` values for use with [`timing_method`] and
+/// [`set_timing_method`].
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(i32)]
+pub enum TimingMethod {
+    /// Normal, traditional, statistical process timing.
+    Statistical = PR_TIMING_STATISTICAL,
+    /// Accurate timestamp based process timing.
+    TimeStamp = PR_TIMING_TIMESTAMP,
+}
+
+impl TryFrom<i32> for TimingMethod {
+    type Error = io::Errno;
+
+    fn try_from(value: i32) -> Result<Self, Self::Error> {
+        match value {
+            PR_TIMING_STATISTICAL => Ok(Self::Statistical),
+            PR_TIMING_TIMESTAMP => Ok(Self::TimeStamp),
+            _ => Err(io::Errno::RANGE),
+        }
+    }
+}
+
+/// Get which process timing method is currently in use.
+///
+/// # References
+///  - [`prctl(PR_GET_TIMING,...)`]
+///
+/// [`prctl(PR_GET_TIMING,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_GET_TIMING")]
+pub fn timing_method() -> io::Result<TimingMethod> {
+    unsafe { prctl_1arg(PR_GET_TIMING) }.and_then(TryInto::try_into)
+}
+
+const PR_SET_TIMING: c_int = 14;
+
+/// Set whether to use (normal, traditional) statistical process timing or
+/// accurate timestamp-based process timing.
+///
+/// # References
+///  - [`prctl(PR_SET_TIMING,...)`]
+///
+/// [`prctl(PR_SET_TIMING,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_TIMING")]
+pub fn set_timing_method(method: TimingMethod) -> io::Result<()> {
+    unsafe { prctl_2args(PR_SET_TIMING, method as usize as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_GET_ENDIAN/PR_SET_ENDIAN
+//
+
+const PR_GET_ENDIAN: c_int = 19;
+
+const PR_ENDIAN_BIG: u32 = 0;
+const PR_ENDIAN_LITTLE: u32 = 1;
+const PR_ENDIAN_PPC_LITTLE: u32 = 2;
+
+/// `PR_ENDIAN_*` values for use with [`endian_mode`].
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(u32)]
+pub enum EndianMode {
+    /// Big endian mode.
+    Big = PR_ENDIAN_BIG,
+    /// True little endian mode.
+    Little = PR_ENDIAN_LITTLE,
+    /// `PowerPC` pseudo little endian.
+    PowerPCLittle = PR_ENDIAN_PPC_LITTLE,
+}
+
+impl TryFrom<u32> for EndianMode {
+    type Error = io::Errno;
+
+    fn try_from(value: u32) -> Result<Self, Self::Error> {
+        match value {
+            PR_ENDIAN_BIG => Ok(Self::Big),
+            PR_ENDIAN_LITTLE => Ok(Self::Little),
+            PR_ENDIAN_PPC_LITTLE => Ok(Self::PowerPCLittle),
+            _ => Err(io::Errno::RANGE),
+        }
+    }
+}
+
+/// Get the endianness of the calling process.
+///
+/// # References
+///  - [`prctl(PR_GET_ENDIAN,...)`]
+///
+/// [`prctl(PR_GET_ENDIAN,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_GET_ENDIAN")]
+pub fn endian_mode() -> io::Result<EndianMode> {
+    unsafe { prctl_get_at_arg2::<c_uint, _>(PR_GET_ENDIAN) }
+}
+
+const PR_SET_ENDIAN: c_int = 20;
+
+/// Set the endianness of the calling process.
+///
+/// # References
+///  - [`prctl(PR_SET_ENDIAN,...)`]
+///
+/// # Safety
+///
+/// Please ensure the conditions necessary to safely call this function, as
+/// detailed in the references above.
+///
+/// [`prctl(PR_SET_ENDIAN,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_ENDIAN")]
+pub unsafe fn set_endian_mode(mode: EndianMode) -> io::Result<()> {
+    prctl_2args(PR_SET_ENDIAN, mode as usize as *mut _).map(|_r| ())
+}
+
+//
+// PR_GET_TSC/PR_SET_TSC
+//
+
+const PR_GET_TSC: c_int = 25;
+
+const PR_TSC_ENABLE: u32 = 1;
+const PR_TSC_SIGSEGV: u32 = 2;
+
+/// `PR_TSC_*` values for use with [`time_stamp_counter_readability`] and
+/// [`set_time_stamp_counter_readability`].
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(u32)]
+pub enum TimeStampCounterReadability {
+    /// Allow the use of the timestamp counter.
+    Readable = PR_TSC_ENABLE,
+    /// Throw a [`Signal::Segv`] signal instead of reading the TSC.
+    RaiseSIGSEGV = PR_TSC_SIGSEGV,
+}
+
+impl TryFrom<u32> for TimeStampCounterReadability {
+    type Error = io::Errno;
+
+    fn try_from(value: u32) -> Result<Self, Self::Error> {
+        match value {
+            PR_TSC_ENABLE => Ok(Self::Readable),
+            PR_TSC_SIGSEGV => Ok(Self::RaiseSIGSEGV),
+            _ => Err(io::Errno::RANGE),
+        }
+    }
+}
+
+/// Get the state of the flag determining if the timestamp counter can be read.
+///
+/// # References
+///  - [`prctl(PR_GET_TSC,...)`]
+///
+/// [`prctl(PR_GET_TSC,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_GET_TSC")]
+pub fn time_stamp_counter_readability() -> io::Result<TimeStampCounterReadability> {
+    unsafe { prctl_get_at_arg2::<c_uint, _>(PR_GET_TSC) }
+}
+
+const PR_SET_TSC: c_int = 26;
+
+/// Set the state of the flag determining if the timestamp counter can be read
+/// by the process.
+///
+/// # References
+///  - [`prctl(PR_SET_TSC,...)`]
+///
+/// [`prctl(PR_SET_TSC,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_TSC")]
+pub fn set_time_stamp_counter_readability(
+    readability: TimeStampCounterReadability,
+) -> io::Result<()> {
+    unsafe { prctl_2args(PR_SET_TSC, readability as usize as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_TASK_PERF_EVENTS_DISABLE/PR_TASK_PERF_EVENTS_ENABLE
+//
+
+const PR_TASK_PERF_EVENTS_DISABLE: c_int = 31;
+const PR_TASK_PERF_EVENTS_ENABLE: c_int = 32;
+
+/// Enable or disable all performance counters attached to the calling process.
+///
+/// # References
+///  - [`prctl(PR_TASK_PERF_EVENTS_ENABLE,...)`]
+///  - [`prctl(PR_TASK_PERF_EVENTS_DISABLE,...)`]
+///
+/// [`prctl(PR_TASK_PERF_EVENTS_ENABLE,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+/// [`prctl(PR_TASK_PERF_EVENTS_DISABLE,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_TASK_PERF_EVENTS_ENABLE")]
+#[doc(alias = "PR_TASK_PERF_EVENTS_DISABLE")]
+pub fn configure_performance_counters(enable: bool) -> io::Result<()> {
+    let option = if enable {
+        PR_TASK_PERF_EVENTS_ENABLE
+    } else {
+        PR_TASK_PERF_EVENTS_DISABLE
+    };
+
+    unsafe { prctl_1arg(option) }.map(|_r| ())
+}
+
+//
+// PR_MCE_KILL_GET/PR_MCE_KILL
+//
+
+const PR_MCE_KILL_GET: c_int = 34;
+
+const PR_MCE_KILL_LATE: u32 = 0;
+const PR_MCE_KILL_EARLY: u32 = 1;
+const PR_MCE_KILL_DEFAULT: u32 = 2;
+
+/// `PR_MCE_KILL_*` values for use with
+/// [`machine_check_memory_corruption_kill_policy`] and
+/// [`set_machine_check_memory_corruption_kill_policy`].
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(u32)]
+pub enum MachineCheckMemoryCorruptionKillPolicy {
+    /// Late kill policy.
+    #[doc(alias = "PR_MCE_KILL_LATE")]
+    Late = PR_MCE_KILL_LATE,
+    /// Early kill policy.
+    #[doc(alias = "PR_MCE_KILL_EARLY")]
+    Early = PR_MCE_KILL_EARLY,
+    /// System-wide default policy.
+    #[doc(alias = "PR_MCE_KILL_DEFAULT")]
+    Default = PR_MCE_KILL_DEFAULT,
+}
+
+impl TryFrom<u32> for MachineCheckMemoryCorruptionKillPolicy {
+    type Error = io::Errno;
+
+    fn try_from(value: u32) -> Result<Self, Self::Error> {
+        match value {
+            PR_MCE_KILL_LATE => Ok(Self::Late),
+            PR_MCE_KILL_EARLY => Ok(Self::Early),
+            PR_MCE_KILL_DEFAULT => Ok(Self::Default),
+            _ => Err(io::Errno::RANGE),
+        }
+    }
+}
+
+/// Get the current per-process machine check kill policy.
+///
+/// # References
+///  - [`prctl(PR_MCE_KILL_GET,...)`]
+///
+/// [`prctl(PR_MCE_KILL_GET,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_MCE_KILL_GET")]
+pub fn machine_check_memory_corruption_kill_policy(
+) -> io::Result<MachineCheckMemoryCorruptionKillPolicy> {
+    let r = unsafe { prctl_1arg(PR_MCE_KILL_GET)? } as c_uint;
+    MachineCheckMemoryCorruptionKillPolicy::try_from(r)
+}
+
+const PR_MCE_KILL: c_int = 33;
+
+const PR_MCE_KILL_CLEAR: usize = 0;
+const PR_MCE_KILL_SET: usize = 1;
+
+/// Set the machine check memory corruption kill policy for the calling thread.
+///
+/// # References
+///  - [`prctl(PR_MCE_KILL,...)`]
+///
+/// [`prctl(PR_MCE_KILL,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_MCE_KILL")]
+pub fn set_machine_check_memory_corruption_kill_policy(
+    policy: Option<MachineCheckMemoryCorruptionKillPolicy>,
+) -> io::Result<()> {
+    let (sub_operation, policy) = if let Some(policy) = policy {
+        (PR_MCE_KILL_SET, policy as usize as *mut _)
+    } else {
+        (PR_MCE_KILL_CLEAR, null_mut())
+    };
+
+    unsafe { prctl_3args(PR_MCE_KILL, sub_operation as *mut _, policy) }.map(|_r| ())
+}
+
+//
+// PR_SET_MM
+//
+
+const PR_SET_MM: c_int = 35;
+
+const PR_SET_MM_START_CODE: u32 = 1;
+const PR_SET_MM_END_CODE: u32 = 2;
+const PR_SET_MM_START_DATA: u32 = 3;
+const PR_SET_MM_END_DATA: u32 = 4;
+const PR_SET_MM_START_STACK: u32 = 5;
+const PR_SET_MM_START_BRK: u32 = 6;
+const PR_SET_MM_BRK: u32 = 7;
+const PR_SET_MM_ARG_START: u32 = 8;
+const PR_SET_MM_ARG_END: u32 = 9;
+const PR_SET_MM_ENV_START: u32 = 10;
+const PR_SET_MM_ENV_END: u32 = 11;
+const PR_SET_MM_AUXV: usize = 12;
+const PR_SET_MM_EXE_FILE: usize = 13;
+const PR_SET_MM_MAP: usize = 14;
+const PR_SET_MM_MAP_SIZE: usize = 15;
+
+/// `PR_SET_MM_*` values for use with [`set_virtual_memory_map_address`].
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(u32)]
+pub enum VirtualMemoryMapAddress {
+    /// Set the address above which the program text can run.
+    CodeStart = PR_SET_MM_START_CODE,
+    /// Set the address below which the program text can run.
+    CodeEnd = PR_SET_MM_END_CODE,
+    /// Set the address above which initialized and uninitialized (bss) data
+    /// are placed.
+    DataStart = PR_SET_MM_START_DATA,
+    /// Set the address below which initialized and uninitialized (bss) data
+    /// are placed.
+    DataEnd = PR_SET_MM_END_DATA,
+    /// Set the start address of the stack.
+    StackStart = PR_SET_MM_START_STACK,
+    /// Set the address above which the program heap can be expanded with `brk`
+    /// call.
+    BrkStart = PR_SET_MM_START_BRK,
+    /// Set the current `brk` value.
+    BrkCurrent = PR_SET_MM_BRK,
+    /// Set the address above which the program command line is placed.
+    ArgStart = PR_SET_MM_ARG_START,
+    /// Set the address below which the program command line is placed.
+    ArgEnd = PR_SET_MM_ARG_END,
+    /// Set the address above which the program environment is placed.
+    EnvironmentStart = PR_SET_MM_ENV_START,
+    /// Set the address below which the program environment is placed.
+    EnvironmentEnd = PR_SET_MM_ENV_END,
+}
+
+/// Modify certain kernel memory map descriptor addresses of the calling
+/// process.
+///
+/// # References
+///  - [`prctl(PR_SET_MM,...)`]
+///
+/// # Safety
+///
+/// Please ensure the conditions necessary to safely call this function, as
+/// detailed in the references above.
+///
+/// [`prctl(PR_SET_MM,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_MM")]
+pub unsafe fn set_virtual_memory_map_address(
+    option: VirtualMemoryMapAddress,
+    address: Option<NonNull<c_void>>,
+) -> io::Result<()> {
+    let address = address.map_or_else(null_mut, NonNull::as_ptr);
+    prctl_3args(PR_SET_MM, option as usize as *mut _, address).map(|_r| ())
+}
+
+/// Supersede the `/proc/pid/exe` symbolic link with a new one pointing to a
+/// new executable file.
+///
+/// # References
+///  - [`prctl(PR_SET_MM,PR_SET_MM_EXE_FILE,...)`]
+///
+/// [`prctl(PR_SET_MM,PR_SET_MM_EXE_FILE,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_MM")]
+#[doc(alias = "PR_SET_MM_EXE_FILE")]
+pub fn set_executable_file(fd: BorrowedFd<'_>) -> io::Result<()> {
+    let fd = usize::try_from(fd.as_raw_fd()).map_err(|_r| io::Errno::RANGE)?;
+    unsafe { prctl_3args(PR_SET_MM, PR_SET_MM_EXE_FILE as *mut _, fd as *mut _) }.map(|_r| ())
+}
+
+/// Set a new auxiliary vector.
+///
+/// # References
+///  - [`prctl(PR_SET_MM,PR_SET_MM_AUXV,...)`]
+///
+/// # Safety
+///
+/// Please ensure the conditions necessary to safely call this function, as
+/// detailed in the references above.
+///
+/// [`prctl(PR_SET_MM,PR_SET_MM_AUXV,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_MM")]
+#[doc(alias = "PR_SET_MM_AUXV")]
+pub unsafe fn set_auxiliary_vector(auxv: &[*const c_void]) -> io::Result<()> {
+    syscalls::prctl(
+        PR_SET_MM,
+        PR_SET_MM_AUXV as *mut _,
+        auxv.as_ptr() as *mut _,
+        auxv.len() as *mut _,
+        null_mut(),
+    )
+    .map(|_r| ())
+}
+
+/// Get the size of the [`PrctlMmMap`] the kernel expects.
+///
+/// # References
+///  - [`prctl(PR_SET_MM,PR_SET_MM_MAP_SIZE,...)`]
+///
+/// [`prctl(PR_SET_MM,PR_SET_MM_MAP_SIZE,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_MM")]
+#[doc(alias = "PR_SET_MM_MAP_SIZE")]
+pub fn virtual_memory_map_config_struct_size() -> io::Result<usize> {
+    let mut value: c_uint = 0;
+    let value_ptr = as_mut_ptr(&mut value);
+    unsafe { prctl_3args(PR_SET_MM, PR_SET_MM_MAP_SIZE as *mut _, value_ptr.cast())? };
+    Ok(value as usize)
+}
+
+/// This structure provides new memory descriptor map which mostly modifies
+/// `/proc/pid/stat[m]` output for a task.
+/// This mostly done in a sake of checkpoint/restore functionality.
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct PrctlMmMap {
+    /// Code section start address.
+    pub start_code: u64,
+    /// Code section end address.
+    pub end_code: u64,
+    /// Data section start address.
+    pub start_data: u64,
+    /// Data section end address.
+    pub end_data: u64,
+    /// `brk` start address.
+    pub start_brk: u64,
+    /// `brk` current address.
+    pub brk: u64,
+    /// Stack start address.
+    pub start_stack: u64,
+    /// Program command line start address.
+    pub arg_start: u64,
+    /// Program command line end address.
+    pub arg_end: u64,
+    /// Program environment start address.
+    pub env_start: u64,
+    /// Program environment end address.
+    pub env_end: u64,
+    /// Auxiliary vector start address.
+    pub auxv: *mut u64,
+    /// Auxiliary vector size.
+    pub auxv_size: u32,
+    /// File descriptor of executable file that was used to create this
+    /// process.
+    pub exe_fd: u32,
+}
+
+/// Provides one-shot access to all the addresses by passing in a
+/// [`PrctlMmMap`].
+///
+/// # References
+///  - [`prctl(PR_SET_MM,PR_SET_MM_MAP,...)`]
+///
+/// # Safety
+///
+/// Please ensure the conditions necessary to safely call this function, as
+/// detailed in the references above.
+///
+/// [`prctl(PR_SET_MM,PR_SET_MM_MAP,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_MM")]
+#[doc(alias = "PR_SET_MM_MAP")]
+pub unsafe fn configure_virtual_memory_map(config: &PrctlMmMap) -> io::Result<()> {
+    syscalls::prctl(
+        PR_SET_MM,
+        PR_SET_MM_MAP as *mut _,
+        as_ptr(config) as *mut _,
+        size_of::<PrctlMmMap>() as *mut _,
+        null_mut(),
+    )
+    .map(|_r| ())
+}
+
+//
+// PR_SET_PTRACER
+//
+
+const PR_SET_PTRACER: c_int = 0x59_61_6d_61;
+
+const PR_SET_PTRACER_ANY: usize = usize::MAX;
+
+/// Process ptracer.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub enum PTracer {
+    /// None.
+    None,
+    /// Disable `ptrace` restrictions for the calling process.
+    Any,
+    /// Specific process.
+    ProcessID(Pid),
+}
+
+/// Declare that the ptracer process can `ptrace` the calling process as if it
+/// were a direct process ancestor.
+///
+/// # References
+///  - [`prctl(PR_SET_PTRACER,...)`]
+///
+/// [`prctl(PR_SET_PTRACER,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_PTRACER")]
+pub fn set_ptracer(tracer: PTracer) -> io::Result<()> {
+    let pid = match tracer {
+        PTracer::None => null_mut(),
+        PTracer::Any => PR_SET_PTRACER_ANY as *mut _,
+        PTracer::ProcessID(pid) => pid.as_raw_nonzero().get() as usize as *mut _,
+    };
+
+    unsafe { prctl_2args(PR_SET_PTRACER, pid) }.map(|_r| ())
+}
+
+//
+// PR_GET_CHILD_SUBREAPER/PR_SET_CHILD_SUBREAPER
+//
+
+const PR_GET_CHILD_SUBREAPER: c_int = 37;
+
+/// Get the `child subreaper` setting of the calling process.
+///
+/// # References
+///  - [`prctl(PR_GET_CHILD_SUBREAPER,...)`]
+///
+/// [`prctl(PR_GET_CHILD_SUBREAPER,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_GET_CHILD_SUBREAPER")]
+pub fn child_subreaper() -> io::Result<Option<Pid>> {
+    unsafe {
+        let r = prctl_get_at_arg2_optional::<c_uint>(PR_GET_CHILD_SUBREAPER)?;
+        Ok(Pid::from_raw(r as RawPid))
+    }
+}
+
+const PR_SET_CHILD_SUBREAPER: c_int = 36;
+
+/// Set the `child subreaper` attribute of the calling process.
+///
+/// # References
+///  - [`prctl(PR_SET_CHILD_SUBREAPER,...)`]
+///
+/// [`prctl(PR_SET_CHILD_SUBREAPER,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_CHILD_SUBREAPER")]
+pub fn set_child_subreaper(pid: Option<Pid>) -> io::Result<()> {
+    let pid = pid.map_or(0_usize, |pid| pid.as_raw_nonzero().get() as usize);
+    unsafe { prctl_2args(PR_SET_CHILD_SUBREAPER, pid as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_GET_FP_MODE/PR_SET_FP_MODE
+//
+
+const PR_GET_FP_MODE: c_int = 46;
+
+const PR_FP_MODE_FR: u32 = 1_u32 << 0;
+const PR_FP_MODE_FRE: u32 = 1_u32 << 1;
+
+/// `PR_FP_MODE_*` values for use with [`floating_point_mode`] and
+/// [`set_floating_point_mode`].
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(u32)]
+pub enum FloatingPointMode {
+    /// 64-bit floating point registers.
+    FloatingPointRegisters = PR_FP_MODE_FR,
+    /// Enable emulation of 32-bit floating-point mode.
+    FloatingPointEmulation = PR_FP_MODE_FRE,
+}
+
+impl TryFrom<u32> for FloatingPointMode {
+    type Error = io::Errno;
+
+    fn try_from(value: u32) -> Result<Self, Self::Error> {
+        match value {
+            PR_FP_MODE_FR => Ok(Self::FloatingPointRegisters),
+            PR_FP_MODE_FRE => Ok(Self::FloatingPointEmulation),
+            _ => Err(io::Errno::RANGE),
+        }
+    }
+}
+
+/// Get the current floating point mode.
+///
+/// # References
+///  - [`prctl(PR_GET_FP_MODE,...)`]
+///
+/// [`prctl(PR_GET_FP_MODE,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_GET_FP_MODE")]
+pub fn floating_point_mode() -> io::Result<FloatingPointMode> {
+    let r = unsafe { prctl_1arg(PR_GET_FP_MODE)? } as c_uint;
+    FloatingPointMode::try_from(r)
+}
+
+const PR_SET_FP_MODE: c_int = 45;
+
+/// Allow control of the floating point mode from user space.
+///
+/// # References
+///  - [`prctl(PR_SET_FP_MODE,...)`]
+///
+/// [`prctl(PR_SET_FP_MODE,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_FP_MODE")]
+pub fn set_floating_point_mode(mode: FloatingPointMode) -> io::Result<()> {
+    unsafe { prctl_2args(PR_SET_FP_MODE, mode as usize as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_GET_SPECULATION_CTRL/PR_SET_SPECULATION_CTRL
+//
+
+const PR_GET_SPECULATION_CTRL: c_int = 52;
+
+const PR_SPEC_STORE_BYPASS: u32 = 0;
+const PR_SPEC_INDIRECT_BRANCH: u32 = 1;
+const PR_SPEC_L1D_FLUSH: u32 = 2;
+
+/// `PR_SPEC_*` values for use with [`speculative_feature_state`] and
+/// [`control_speculative_feature`].
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(u32)]
+pub enum SpeculationFeature {
+    /// Set the state of the speculative store bypass misfeature.
+    SpeculativeStoreBypass = PR_SPEC_STORE_BYPASS,
+    /// Set the state of the indirect branch speculation misfeature.
+    IndirectBranchSpeculation = PR_SPEC_INDIRECT_BRANCH,
+    /// Flush L1D Cache on context switch out of the task.
+    FlushL1DCacheOnContextSwitchOutOfTask = PR_SPEC_L1D_FLUSH,
+}
+
+impl TryFrom<u32> for SpeculationFeature {
+    type Error = io::Errno;
+
+    fn try_from(value: u32) -> Result<Self, Self::Error> {
+        match value {
+            PR_SPEC_STORE_BYPASS => Ok(Self::SpeculativeStoreBypass),
+            PR_SPEC_INDIRECT_BRANCH => Ok(Self::IndirectBranchSpeculation),
+            PR_SPEC_L1D_FLUSH => Ok(Self::FlushL1DCacheOnContextSwitchOutOfTask),
+            _ => Err(io::Errno::RANGE),
+        }
+    }
+}
+
+bitflags! {
+    /// `PR_SPEC_*` flags for use with [`control_speculative_feature`].
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct SpeculationFeatureControl: u32 {
+        /// The speculation feature is enabled, mitigation is disabled.
+        const ENABLE = 1_u32 << 1;
+        /// The speculation feature is disabled, mitigation is enabled.
+        const DISABLE = 1_u32 << 2;
+        /// The speculation feature is disabled, mitigation is enabled, and it
+        /// cannot be undone.
+        const FORCE_DISABLE = 1_u32 << 3;
+        /// The speculation feature is disabled, mitigation is enabled, and the
+        /// state will be cleared on `execve`.
+        const DISABLE_NOEXEC = 1_u32 << 4;
+    }
+}
+
+bitflags! {
+    /// Zero means the processors are not vulnerable.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct SpeculationFeatureState: u32 {
+        /// Mitigation can be controlled per thread by
+        /// `PR_SET_SPECULATION_CTRL`.
+        const PRCTL = 1_u32 << 0;
+        /// The speculation feature is enabled, mitigation is disabled.
+        const ENABLE = 1_u32 << 1;
+        /// The speculation feature is disabled, mitigation is enabled.
+        const DISABLE = 1_u32 << 2;
+        /// The speculation feature is disabled, mitigation is enabled, and it
+        /// cannot be undone.
+        const FORCE_DISABLE = 1_u32 << 3;
+        /// The speculation feature is disabled, mitigation is enabled, and the
+        /// state will be cleared on `execve`.
+        const DISABLE_NOEXEC = 1_u32 << 4;
+    }
+}
+
+/// Get the state of the speculation misfeature.
+///
+/// # References
+///  - [`prctl(PR_GET_SPECULATION_CTRL,...)`]
+///
+/// [`prctl(PR_GET_SPECULATION_CTRL,...)`]: https://www.kernel.org/doc/html/v5.18/userspace-api/spec_ctrl.html
+#[inline]
+#[doc(alias = "PR_GET_SPECULATION_CTRL")]
+pub fn speculative_feature_state(
+    feature: SpeculationFeature,
+) -> io::Result<Option<SpeculationFeatureState>> {
+    let r = unsafe { prctl_2args(PR_GET_SPECULATION_CTRL, feature as usize as *mut _)? } as c_uint;
+    Ok(SpeculationFeatureState::from_bits(r))
+}
+
+const PR_SET_SPECULATION_CTRL: c_int = 53;
+
+/// Sets the state of the speculation misfeature.
+///
+/// # References
+///  - [`prctl(PR_SET_SPECULATION_CTRL,...)`]
+///
+/// [`prctl(PR_SET_SPECULATION_CTRL,...)`]: https://www.kernel.org/doc/html/v5.18/userspace-api/spec_ctrl.html
+#[inline]
+#[doc(alias = "PR_SET_SPECULATION_CTRL")]
+pub fn control_speculative_feature(
+    feature: SpeculationFeature,
+    config: SpeculationFeatureControl,
+) -> io::Result<()> {
+    let feature = feature as usize as *mut _;
+    let config = config.bits() as usize as *mut _;
+    unsafe { prctl_3args(PR_SET_SPECULATION_CTRL, feature, config) }.map(|_r| ())
+}
+
+//
+// PR_GET_IO_FLUSHER/PR_SET_IO_FLUSHER
+//
+
+const PR_GET_IO_FLUSHER: c_int = 58;
+
+/// Get the `IO_FLUSHER` state of the caller.
+///
+/// # References
+///  - [`prctl(PR_GET_IO_FLUSHER,...)`]
+///
+/// [`prctl(PR_GET_IO_FLUSHER,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_GET_IO_FLUSHER")]
+pub fn is_io_flusher() -> io::Result<bool> {
+    unsafe { prctl_1arg(PR_GET_IO_FLUSHER) }.map(|r| r != 0)
+}
+
+const PR_SET_IO_FLUSHER: c_int = 57;
+
+/// Put the process in the `IO_FLUSHER` state, allowing it to make progress
+/// when allocating memory.
+///
+/// # References
+///  - [`prctl(PR_SET_IO_FLUSHER,...)`]
+///
+/// [`prctl(PR_SET_IO_FLUSHER,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[doc(alias = "PR_SET_IO_FLUSHER")]
+pub fn configure_io_flusher_behavior(enable: bool) -> io::Result<()> {
+    unsafe { prctl_2args(PR_SET_IO_FLUSHER, usize::from(enable) as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_PAC_GET_ENABLED_KEYS/PR_PAC_SET_ENABLED_KEYS
+//
+
+const PR_PAC_GET_ENABLED_KEYS: c_int = 61;
+
+/// Get enabled pointer authentication keys.
+///
+/// # References
+///  - [`prctl(PR_PAC_GET_ENABLED_KEYS,...)`]
+///
+/// [`prctl(PR_PAC_GET_ENABLED_KEYS,...)`]: https://www.kernel.org/doc/html/v5.18/arm64/pointer-authentication.html
+#[inline]
+#[doc(alias = "PR_PAC_GET_ENABLED_KEYS")]
+pub fn enabled_pointer_authentication_keys() -> io::Result<PointerAuthenticationKeys> {
+    let r = unsafe { prctl_1arg(PR_PAC_GET_ENABLED_KEYS)? } as c_uint;
+    PointerAuthenticationKeys::from_bits(r).ok_or(io::Errno::RANGE)
+}
+
+const PR_PAC_SET_ENABLED_KEYS: c_int = 60;
+
+/// Set enabled pointer authentication keys.
+///
+/// # References
+///  - [`prctl(PR_PAC_SET_ENABLED_KEYS,...)`]
+///
+/// # Safety
+///
+/// Please ensure the conditions necessary to safely call this function, as
+/// detailed in the references above.
+///
+/// [`prctl(PR_PAC_SET_ENABLED_KEYS,...)`]: https://www.kernel.org/doc/html/v5.18/arm64/pointer-authentication.html
+#[inline]
+#[doc(alias = "PR_PAC_SET_ENABLED_KEYS")]
+pub unsafe fn configure_pointer_authentication_keys(
+    config: impl Iterator<Item = (PointerAuthenticationKeys, bool)>,
+) -> io::Result<()> {
+    let mut affected_keys: u32 = 0;
+    let mut enabled_keys: u32 = 0;
+
+    for (key, enable) in config {
+        let key = key.bits();
+        affected_keys |= key;
+
+        if enable {
+            enabled_keys |= key;
+        } else {
+            enabled_keys &= !key;
+        }
+    }
+
+    if affected_keys == 0 {
+        return Ok(()); // Nothing to do.
+    }
+
+    prctl_3args(
+        PR_PAC_SET_ENABLED_KEYS,
+        affected_keys as usize as *mut _,
+        enabled_keys as usize as *mut _,
+    )
+    .map(|_r| ())
+}
+
+//
+// PR_SET_VMA
+//
+
+const PR_SET_VMA: c_int = 0x53_56_4d_41;
+
+const PR_SET_VMA_ANON_NAME: usize = 0;
+
+/// Set the name for a virtual memory region.
+///
+/// # References
+///  - [`prctl(PR_SET_VMA,PR_SET_VMA_ANON_NAME,...)`]
+///
+/// [`prctl(PR_SET_VMA,PR_SET_VMA_ANON_NAME,...)`]: https://lwn.net/Articles/867818/
+#[inline]
+#[doc(alias = "PR_SET_VMA")]
+#[doc(alias = "PR_SET_VMA_ANON_NAME")]
+pub fn set_virtual_memory_region_name(region: &[u8], name: Option<&CStr>) -> io::Result<()> {
+    unsafe {
+        syscalls::prctl(
+            PR_SET_VMA,
+            PR_SET_VMA_ANON_NAME as *mut _,
+            region.as_ptr() as *mut _,
+            region.len() as *mut _,
+            name.map_or_else(null, CStr::as_ptr) as *mut _,
+        )
+        .map(|_r| ())
+    }
+}
diff --git a/vendor/rustix/src/process/priority.rs b/vendor/rustix/src/process/priority.rs
new file mode 100644
index 0000000..7c29284
--- /dev/null
+++ b/vendor/rustix/src/process/priority.rs
@@ -0,0 +1,132 @@
+#[cfg(not(target_os = "espidf"))]
+use crate::process::{Pid, Uid};
+use crate::{backend, io};
+
+/// `nice(inc)`—Adjust the scheduling priority of the current process.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/nice.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/nice.2.html
+#[inline]
+pub fn nice(inc: i32) -> io::Result<i32> {
+    backend::process::syscalls::nice(inc)
+}
+
+/// `getpriority(PRIO_USER, uid)`—Get the scheduling priority of the given
+/// user.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getpriority.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/getpriority.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setpriority.2.html
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+#[doc(alias = "getpriority")]
+pub fn getpriority_user(uid: Uid) -> io::Result<i32> {
+    backend::process::syscalls::getpriority_user(uid)
+}
+
+/// `getpriority(PRIO_PGRP, gid)`—Get the scheduling priority of the given
+/// process group.
+///
+/// A `pgid` of `None` means the process group of the calling process.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getpriority.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/getpriority.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setpriority.2.html
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+#[doc(alias = "getpriority")]
+pub fn getpriority_pgrp(pgid: Option<Pid>) -> io::Result<i32> {
+    backend::process::syscalls::getpriority_pgrp(pgid)
+}
+
+/// `getpriority(PRIO_PROCESS, pid)`—Get the scheduling priority of the given
+/// process.
+///
+/// A `pid` of `None` means the calling process.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getpriority.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/getpriority.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setpriority.2.html
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+#[doc(alias = "getpriority")]
+pub fn getpriority_process(pid: Option<Pid>) -> io::Result<i32> {
+    backend::process::syscalls::getpriority_process(pid)
+}
+
+/// `setpriority(PRIO_USER, uid)`—Get the scheduling priority of the given
+/// user.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setpriority.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/setpriority.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setpriority.2.html
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+#[doc(alias = "setpriority")]
+pub fn setpriority_user(uid: Uid, priority: i32) -> io::Result<()> {
+    backend::process::syscalls::setpriority_user(uid, priority)
+}
+
+/// `setpriority(PRIO_PGRP, pgid)`—Get the scheduling priority of the given
+/// process group.
+///
+/// A `pgid` of `None` means the process group of the calling process.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setpriority.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/setpriority.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setpriority.2.html
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+#[doc(alias = "setpriority")]
+pub fn setpriority_pgrp(pgid: Option<Pid>, priority: i32) -> io::Result<()> {
+    backend::process::syscalls::setpriority_pgrp(pgid, priority)
+}
+
+/// `setpriority(PRIO_PROCESS, pid)`—Get the scheduling priority of the given
+/// process.
+///
+/// A `pid` of `None` means the calling process.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setpriority.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/setpriority.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setpriority.2.html
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+#[doc(alias = "setpriority")]
+pub fn setpriority_process(pid: Option<Pid>, priority: i32) -> io::Result<()> {
+    backend::process::syscalls::setpriority_process(pid, priority)
+}
diff --git a/vendor/rustix/src/process/procctl.rs b/vendor/rustix/src/process/procctl.rs
new file mode 100644
index 0000000..bb63722
--- /dev/null
+++ b/vendor/rustix/src/process/procctl.rs
@@ -0,0 +1,530 @@
+//! Bindings for the FreeBSD `procctl` system call.
+//!
+//! There are similarities (but also differences) with Linux's `prctl` system
+//! call, whose interface is located in the `prctl.rs` file.
+
+#![allow(unsafe_code)]
+
+#[cfg(feature = "alloc")]
+use alloc::{vec, vec::Vec};
+use core::mem::MaybeUninit;
+use core::ptr;
+
+use bitflags::bitflags;
+
+use crate::backend::c::{c_int, c_uint, c_void};
+use crate::backend::process::syscalls;
+use crate::backend::process::types::RawId;
+use crate::io;
+use crate::process::{Pid, RawPid};
+use crate::signal::Signal;
+use crate::utils::{as_mut_ptr, as_ptr};
+
+//
+// Helper functions.
+//
+
+/// Subset of `idtype_t` C enum, with only the values allowed by `procctl`.
+#[repr(i32)]
+pub enum IdType {
+    /// Process id.
+    Pid = 0,
+    /// Process group id.
+    Pgid = 2,
+}
+
+/// A process selector for use with the `procctl` interface.
+///
+/// `None` represents the current process. `Some((IdType::Pid, pid))`
+/// represents the process with pid `pid`. `Some((IdType::Pgid, pgid))`
+/// represents the control processes belonging to the process group with id
+/// `pgid`.
+pub type ProcSelector = Option<(IdType, Pid)>;
+fn proc_selector_to_raw(selector: ProcSelector) -> (IdType, RawPid) {
+    match selector {
+        Some((idtype, id)) => (idtype, id.as_raw_nonzero().get()),
+        None => (IdType::Pid, 0),
+    }
+}
+
+#[inline]
+pub(crate) unsafe fn procctl(
+    option: c_int,
+    process: ProcSelector,
+    data: *mut c_void,
+) -> io::Result<()> {
+    let (idtype, id) = proc_selector_to_raw(process);
+    syscalls::procctl(idtype as c_uint, id as RawId, option, data)
+}
+
+#[inline]
+pub(crate) unsafe fn procctl_set<P>(
+    option: c_int,
+    process: ProcSelector,
+    data: &P,
+) -> io::Result<()> {
+    procctl(option, process, (as_ptr(data) as *mut P).cast())
+}
+
+#[inline]
+pub(crate) unsafe fn procctl_get_optional<P>(
+    option: c_int,
+    process: ProcSelector,
+) -> io::Result<P> {
+    let mut value: MaybeUninit<P> = MaybeUninit::uninit();
+    procctl(option, process, value.as_mut_ptr().cast())?;
+    Ok(value.assume_init())
+}
+
+//
+// PROC_PDEATHSIG_STATUS/PROC_PDEATHSIG_CTL
+//
+
+const PROC_PDEATHSIG_STATUS: c_int = 12;
+
+/// Get the current value of the parent process death signal.
+///
+/// # References
+///  - [Linux: `prctl(PR_GET_PDEATHSIG,...)`]
+///  - [FreeBSD: `procctl(PROC_PDEATHSIG_STATUS,...)`]
+///
+/// [Linux: `prctl(PR_GET_PDEATHSIG,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+/// [FreeBSD: `procctl(PROC_PDEATHSIG_STATUS,...)`]: https://man.freebsd.org/cgi/man.cgi?query=procctl&sektion=2
+#[inline]
+pub fn parent_process_death_signal() -> io::Result<Option<Signal>> {
+    unsafe { procctl_get_optional::<c_int>(PROC_PDEATHSIG_STATUS, None) }.map(Signal::from_raw)
+}
+
+const PROC_PDEATHSIG_CTL: c_int = 11;
+
+/// Set the parent-death signal of the calling process.
+///
+/// # References
+///  - [Linux: `prctl(PR_SET_PDEATHSIG,...)`]
+///  - [FreeBSD: `procctl(PROC_PDEATHSIG_CTL,...)`]
+///
+/// [Linux: `prctl(PR_SET_PDEATHSIG,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+/// [FreeBSD: `procctl(PROC_PDEATHSIG_CTL,...)`]: https://man.freebsd.org/cgi/man.cgi?query=procctl&sektion=2
+#[inline]
+pub fn set_parent_process_death_signal(signal: Option<Signal>) -> io::Result<()> {
+    let signal = signal.map_or(0, |signal| signal as c_int);
+    unsafe { procctl_set::<c_int>(PROC_PDEATHSIG_CTL, None, &signal) }
+}
+
+//
+// PROC_TRACE_CTL
+//
+
+const PROC_TRACE_CTL: c_int = 7;
+
+const PROC_TRACE_CTL_ENABLE: i32 = 1;
+const PROC_TRACE_CTL_DISABLE: i32 = 2;
+const PROC_TRACE_CTL_DISABLE_EXEC: i32 = 3;
+
+/// `PROC_TRACE_CTL_*`.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(i32)]
+pub enum DumpableBehavior {
+    /// Not dumpable.
+    NotDumpable = PROC_TRACE_CTL_DISABLE,
+    /// Dumpable.
+    Dumpable = PROC_TRACE_CTL_ENABLE,
+    /// Not dumpable, and this behaviour is preserved across `execve` calls.
+    NotDumpableExecPreserved = PROC_TRACE_CTL_DISABLE_EXEC,
+}
+
+/// Set the state of the `dumpable` attribute for the process indicated by
+/// `idtype` and `id`. This determines whether the process can be traced and
+/// whether core dumps are produced for the process upon delivery of a signal
+/// whose default behavior is to produce a core dump.
+///
+/// This is similar to `set_dumpable_behavior` on Linux, with the exception
+/// that on FreeBSD there is an extra argument `process`. When `process` is set
+/// to `None`, the operation is performed for the current process, like on
+/// Linux.
+///
+/// # References
+///  - [FreeBSD `procctl(PROC_TRACE_CTL,...)`]
+///
+/// [FreeBSD `procctl(PROC_TRACE_CTL,...)`]: https://man.freebsd.org/cgi/man.cgi?query=procctl&sektion=2
+#[inline]
+pub fn set_dumpable_behavior(process: ProcSelector, config: DumpableBehavior) -> io::Result<()> {
+    unsafe { procctl(PROC_TRACE_CTL, process, config as usize as *mut _) }
+}
+
+//
+// PROC_TRACE_STATUS
+//
+
+const PROC_TRACE_STATUS: c_int = 8;
+
+/// Tracing status as returned by [`trace_status`].
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub enum TracingStatus {
+    /// Tracing is disabled for the process.
+    NotTraceble,
+    /// Tracing is not disabled for the process, but not debugger/tracer is
+    /// attached.
+    Tracable,
+    /// The process is being traced by the process whose pid is stored in the
+    /// first component of this variant.
+    BeingTraced(Pid),
+}
+
+/// Get the tracing status of the process indicated by `idtype` and `id`.
+///
+/// # References
+///  - [FreeBSD `procctl(PROC_TRACE_STATUS,...)`]
+///
+/// [FreeBSD `procctl(PROC_TRACE_STATUS,...)`]: https://man.freebsd.org/cgi/man.cgi?query=procctl&sektion=2
+#[inline]
+pub fn trace_status(process: ProcSelector) -> io::Result<TracingStatus> {
+    let val = unsafe { procctl_get_optional::<c_int>(PROC_TRACE_STATUS, process) }?;
+    match val {
+        -1 => Ok(TracingStatus::NotTraceble),
+        0 => Ok(TracingStatus::Tracable),
+        pid => {
+            let pid = Pid::from_raw(pid as RawPid).ok_or(io::Errno::RANGE)?;
+            Ok(TracingStatus::BeingTraced(pid))
+        }
+    }
+}
+
+//
+// PROC_REAP_*
+//
+
+const PROC_REAP_ACQUIRE: c_int = 2;
+const PROC_REAP_RELEASE: c_int = 3;
+
+/// Acquire or release the reaper status of the calling process.
+///
+/// # References
+///  - [FreeBSD: `procctl(PROC_REAP_ACQUIRE/RELEASE,...)`]
+///
+/// [FreeBSD: `procctl(PROC_REAP_ACQUIRE/RELEASE,...)`]: https://man.freebsd.org/cgi/man.cgi?query=procctl&sektion=2
+#[inline]
+pub fn set_reaper_status(reaper: bool) -> io::Result<()> {
+    unsafe {
+        procctl(
+            if reaper {
+                PROC_REAP_ACQUIRE
+            } else {
+                PROC_REAP_RELEASE
+            },
+            None,
+            ptr::null_mut(),
+        )
+    }
+}
+
+const PROC_REAP_STATUS: c_int = 4;
+
+bitflags! {
+    /// `REAPER_STATUS_*`.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct ReaperStatusFlags: c_uint {
+        /// The process has acquired reaper status.
+        const OWNED = 1;
+        /// The process is the root of the reaper tree (pid 1).
+        const REALINIT = 2;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[repr(C)]
+struct procctl_reaper_status {
+    rs_flags: c_uint,
+    rs_children: c_uint,
+    rs_descendants: c_uint,
+    rs_reaper: RawPid,
+    rs_pid: RawPid,
+    rs_pad0: [c_uint; 15],
+}
+
+/// Reaper status as returned by [`get_reaper_status`].
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub struct ReaperStatus {
+    /// The flags.
+    pub flags: ReaperStatusFlags,
+    /// The number of children of the reaper among the descendants.
+    pub children: usize,
+    /// The total number of descendants of the reaper(s), not counting
+    /// descendants of the reaper in the subtree.
+    pub descendants: usize,
+    /// The pid of the reaper for the specified process id.
+    pub reaper: Pid,
+    /// The pid of one reaper child if there are any descendants.
+    pub pid: Option<Pid>,
+}
+
+/// Get information about the reaper of the specified process (or the process
+/// itself if it is a reaper).
+///
+/// # References
+///  - [FreeBSD: `procctl(PROC_REAP_STATUS,...)`]
+///
+/// [FreeBSD: `procctl(PROC_REAP_STATUS,...)`]: https://man.freebsd.org/cgi/man.cgi?query=procctl&sektion=2
+#[inline]
+pub fn get_reaper_status(process: ProcSelector) -> io::Result<ReaperStatus> {
+    let raw = unsafe { procctl_get_optional::<procctl_reaper_status>(PROC_REAP_STATUS, process) }?;
+    Ok(ReaperStatus {
+        flags: ReaperStatusFlags::from_bits_retain(raw.rs_flags),
+        children: raw.rs_children as _,
+        descendants: raw.rs_descendants as _,
+        reaper: Pid::from_raw(raw.rs_reaper).ok_or(io::Errno::RANGE)?,
+        pid: if raw.rs_pid == -1 {
+            None
+        } else {
+            Some(Pid::from_raw(raw.rs_pid).ok_or(io::Errno::RANGE)?)
+        },
+    })
+}
+
+const PROC_REAP_GETPIDS: c_int = 5;
+
+bitflags! {
+    /// `REAPER_PIDINFO_*`.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct PidInfoFlags: c_uint {
+        /// This structure was filled by the kernel.
+        const VALID = 1;
+        /// The pid field identifies a direct child of the reaper.
+        const CHILD = 2;
+        /// The reported process is itself a reaper. Descendants of a
+        /// subordinate reaper are not reported.
+        const REAPER = 4;
+        /// The reported process is in the zombie state.
+        const ZOMBIE = 8;
+        /// The reported process is stopped by
+        /// [`Signal::Stop`]/[`Signal::Tstp`].
+        const STOPPED = 16;
+        /// The reported process is in the process of exiting.
+        const EXITING = 32;
+    }
+}
+
+#[repr(C)]
+#[derive(Default, Clone)]
+struct procctl_reaper_pidinfo {
+    pi_pid: RawPid,
+    pi_subtree: RawPid,
+    pi_flags: c_uint,
+    pi_pad0: [c_uint; 15],
+}
+
+#[repr(C)]
+struct procctl_reaper_pids {
+    rp_count: c_uint,
+    rp_pad0: [c_uint; 15],
+    rp_pids: *mut procctl_reaper_pidinfo,
+}
+
+/// A child process of a reaper.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub struct PidInfo {
+    /// The flags of the process.
+    pub flags: PidInfoFlags,
+    /// The pid of the process.
+    pub pid: Pid,
+    /// The pid of the child of the reaper which is the (grand-..)parent of the
+    /// process.
+    pub subtree: Pid,
+}
+
+/// Get the list of descendants of the specified reaper process.
+///
+/// # References
+///  - [FreeBSD: `procctl(PROC_REAP_GETPIDS,...)`]
+///
+/// [FreeBSD: `procctl(PROC_REAP_GETPIDS,...)`]: https://man.freebsd.org/cgi/man.cgi?query=procctl&sektion=2
+#[cfg(feature = "alloc")]
+pub fn get_reaper_pids(process: ProcSelector) -> io::Result<Vec<PidInfo>> {
+    // Sadly no better way to guarantee that we get all the results than to
+    // allocate ~8MB of memory..
+    const PID_MAX: usize = 99999;
+    let mut pids: Vec<procctl_reaper_pidinfo> = vec![Default::default(); PID_MAX];
+    let mut pinfo = procctl_reaper_pids {
+        rp_count: PID_MAX as _,
+        rp_pad0: [0; 15],
+        rp_pids: pids.as_mut_slice().as_mut_ptr(),
+    };
+    unsafe { procctl(PROC_REAP_GETPIDS, process, as_mut_ptr(&mut pinfo).cast())? };
+    let mut result = Vec::new();
+    for raw in pids.into_iter() {
+        let flags = PidInfoFlags::from_bits_retain(raw.pi_flags);
+        if !flags.contains(PidInfoFlags::VALID) {
+            break;
+        }
+        result.push(PidInfo {
+            flags,
+            subtree: Pid::from_raw(raw.pi_subtree).ok_or(io::Errno::RANGE)?,
+            pid: Pid::from_raw(raw.pi_pid).ok_or(io::Errno::RANGE)?,
+        });
+    }
+    Ok(result)
+}
+
+const PROC_REAP_KILL: c_int = 6;
+
+bitflags! {
+    /// `REAPER_KILL_*`.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    struct KillFlags: c_uint {
+        const CHILDREN = 1;
+        const SUBTREE = 2;
+    }
+}
+
+#[repr(C)]
+struct procctl_reaper_kill {
+    rk_sig: c_int,
+    rk_flags: c_uint,
+    rk_subtree: RawPid,
+    rk_killed: c_uint,
+    rk_fpid: RawPid,
+    rk_pad0: [c_uint; 15],
+}
+
+/// Reaper status as returned by [`get_reaper_status`].
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub struct KillResult {
+    /// The number of processes that were signalled.
+    pub killed: usize,
+    /// The pid of the first process that wasn't successfully signalled.
+    pub first_failed: Option<Pid>,
+}
+
+/// Deliver a signal to some subset of
+///
+/// # References
+///  - [FreeBSD: `procctl(PROC_REAP_KILL,...)`]
+///
+/// [FreeBSD: `procctl(PROC_REAP_KILL,...)`]: https://man.freebsd.org/cgi/man.cgi?query=procctl&sektion=2
+pub fn reaper_kill(
+    process: ProcSelector,
+    signal: Signal,
+    direct_children: bool,
+    subtree: Option<Pid>,
+) -> io::Result<KillResult> {
+    let mut flags = KillFlags::empty();
+    flags.set(KillFlags::CHILDREN, direct_children);
+    flags.set(KillFlags::SUBTREE, subtree.is_some());
+    let mut req = procctl_reaper_kill {
+        rk_sig: signal as c_int,
+        rk_flags: flags.bits(),
+        rk_subtree: subtree.map(|p| p.as_raw_nonzero().into()).unwrap_or(0),
+        rk_killed: 0,
+        rk_fpid: 0,
+        rk_pad0: [0; 15],
+    };
+    unsafe { procctl(PROC_REAP_KILL, process, as_mut_ptr(&mut req).cast())? };
+    Ok(KillResult {
+        killed: req.rk_killed as _,
+        first_failed: Pid::from_raw(req.rk_fpid),
+    })
+}
+
+//
+// PROC_TRAPCAP_STATUS/PROC_TRAPCAP_CTL
+//
+
+const PROC_TRAPCAP_CTL: c_int = 9;
+
+const PROC_TRAPCAP_CTL_ENABLE: i32 = 1;
+const PROC_TRAPCAP_CTL_DISABLE: i32 = 2;
+
+/// `PROC_TRAPCAP_CTL_*`.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(i32)]
+pub enum TrapCapBehavior {
+    /// Disable the [`Signal::Trap`] signal delivery on capability mode access
+    /// violations.
+    Disable = PROC_TRAPCAP_CTL_DISABLE,
+    /// Enable the [`Signal::Trap`] signal delivery on capability mode access
+    /// violations.
+    Enable = PROC_TRAPCAP_CTL_ENABLE,
+}
+
+/// Set the current value of the capability mode violation trapping behavior.
+/// If this behavior is enabled, the kernel would deliver a [`Signal::Trap`]
+/// signal on any return from a system call that would result in a
+/// [`io::Errno::NOTCAPABLE`]` or [`io::Errno::CAPMODE`] error.
+///
+/// This behavior is inherited by the children of the process and is kept
+/// across `execve` calls.
+///
+/// # References
+///  - [FreeBSD: `procctl(PROC_TRAPCAP_CTL,...)`]
+///
+/// [FreeBSD: `procctl(PROC_TRAPCAP_CTL,...)`]: https://man.freebsd.org/cgi/man.cgi?query=procctl&sektion=2
+#[inline]
+pub fn set_trap_cap_behavior(process: ProcSelector, config: TrapCapBehavior) -> io::Result<()> {
+    let config = config as c_int;
+    unsafe { procctl_set::<c_int>(PROC_TRAPCAP_CTL, process, &config) }
+}
+
+const PROC_TRAPCAP_STATUS: c_int = 10;
+
+/// Get the current value of the capability mode violation trapping behavior.
+///
+/// # References
+///  - [FreeBSD: `procctl(PROC_TRAPCAP_STATUS,...)`]
+///
+/// [FreeBSD: `procctl(PROC_TRAPCAP_STATUS,...)`]: https://man.freebsd.org/cgi/man.cgi?query=procctl&sektion=2
+#[inline]
+pub fn trap_cap_behavior(process: ProcSelector) -> io::Result<TrapCapBehavior> {
+    let val = unsafe { procctl_get_optional::<c_int>(PROC_TRAPCAP_STATUS, process) }?;
+    match val {
+        PROC_TRAPCAP_CTL_DISABLE => Ok(TrapCapBehavior::Disable),
+        PROC_TRAPCAP_CTL_ENABLE => Ok(TrapCapBehavior::Enable),
+        _ => Err(io::Errno::RANGE),
+    }
+}
+
+//
+// PROC_NO_NEW_PRIVS_STATUS/PROC_NO_NEW_PRIVS_CTL
+//
+
+const PROC_NO_NEW_PRIVS_CTL: c_int = 19;
+
+const PROC_NO_NEW_PRIVS_ENABLE: c_int = 1;
+
+/// Enable the `no_new_privs` mode that ignores SUID and SGID bits on `execve`
+/// in the specified process and its future descendants.
+///
+/// This is similar to `set_no_new_privs` on Linux, with the exception that on
+/// FreeBSD there is no argument `no_new_privs` argument as it's only possible
+/// to enable this mode and there's no going back.
+///
+/// # References
+///  - [Linux: `prctl(PR_SET_NO_NEW_PRIVS,...)`]
+///  - [FreeBSD: `procctl(PROC_NO_NEW_PRIVS_CTL,...)`]
+///
+/// [Linux: `prctl(PR_SET_NO_NEW_PRIVS,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+/// [FreeBSD: `procctl(PROC_NO_NEW_PRIVS_CTL,...)`]: https://man.freebsd.org/cgi/man.cgi?query=procctl&sektion=2
+#[inline]
+pub fn set_no_new_privs(process: ProcSelector) -> io::Result<()> {
+    unsafe { procctl_set::<c_int>(PROC_NO_NEW_PRIVS_CTL, process, &PROC_NO_NEW_PRIVS_ENABLE) }
+}
+
+const PROC_NO_NEW_PRIVS_STATUS: c_int = 20;
+
+/// Check the `no_new_privs` mode of the specified process.
+///
+/// # References
+///  - [Linux: `prctl(PR_GET_NO_NEW_PRIVS,...)`]
+///  - [FreeBSD: `procctl(PROC_NO_NEW_PRIVS_STATUS,...)`]
+///
+/// [Linux: `prctl(PR_GET_NO_NEW_PRIVS,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+/// [FreeBSD: `procctl(PROC_NO_NEW_PRIVS_STATUS,...)`]: https://man.freebsd.org/cgi/man.cgi?query=procctl&sektion=2
+#[inline]
+pub fn no_new_privs(process: ProcSelector) -> io::Result<bool> {
+    unsafe { procctl_get_optional::<c_int>(PROC_NO_NEW_PRIVS_STATUS, process) }
+        .map(|x| x == PROC_NO_NEW_PRIVS_ENABLE)
+}
diff --git a/vendor/rustix/src/process/rlimit.rs b/vendor/rustix/src/process/rlimit.rs
new file mode 100644
index 0000000..ea760c2
--- /dev/null
+++ b/vendor/rustix/src/process/rlimit.rs
@@ -0,0 +1,53 @@
+#[cfg(linux_kernel)]
+use crate::process::Pid;
+use crate::{backend, io};
+
+pub use backend::process::types::Resource;
+
+/// `struct rlimit`—Current and maximum values used in [`getrlimit`],
+/// [`setrlimit`], and [`prlimit`].
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Rlimit {
+    /// Current effective, “soft”, limit.
+    pub current: Option<u64>,
+    /// Maximum, “hard”, value that `current` may be dynamically increased to.
+    pub maximum: Option<u64>,
+}
+
+/// `getrlimit(resource)`—Get a process resource limit value.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getrlimit.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/getrlimit.2.html
+#[inline]
+pub fn getrlimit(resource: Resource) -> Rlimit {
+    backend::process::syscalls::getrlimit(resource)
+}
+
+/// `setrlimit(resource, new)`—Set a process resource limit value.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setrlimit.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/setrlimit.2.html
+#[inline]
+pub fn setrlimit(resource: Resource, new: Rlimit) -> io::Result<()> {
+    backend::process::syscalls::setrlimit(resource, new)
+}
+
+/// `prlimit(pid, resource, new)`—Get and set a process resource limit value.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/prlimit.2.html
+#[cfg(linux_kernel)]
+#[inline]
+pub fn prlimit(pid: Option<Pid>, resource: Resource, new: Rlimit) -> io::Result<Rlimit> {
+    backend::process::syscalls::prlimit(pid, resource, new)
+}
diff --git a/vendor/rustix/src/process/sched.rs b/vendor/rustix/src/process/sched.rs
new file mode 100644
index 0000000..d6a303a
--- /dev/null
+++ b/vendor/rustix/src/process/sched.rs
@@ -0,0 +1,125 @@
+use crate::process::Pid;
+use crate::{backend, io};
+
+/// `CpuSet` represents a bit-mask of CPUs.
+///
+/// `CpuSet`s are used by [`sched_setaffinity`] and [`sched_getaffinity`], for
+/// example.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man3/CPU_SET.3.html
+/// [`sched_setaffinity`]: crate::process::sched_setaffinity
+/// [`sched_getaffinity`]: crate::process::sched_getaffinity
+#[repr(C)]
+#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
+pub struct CpuSet {
+    cpu_set: backend::process::types::RawCpuSet,
+}
+
+impl CpuSet {
+    /// The maximum number of CPU in `CpuSet`.
+    pub const MAX_CPU: usize = backend::process::types::CPU_SETSIZE;
+
+    /// Create a new and empty `CpuSet`.
+    #[inline]
+    pub fn new() -> Self {
+        Self {
+            cpu_set: backend::process::types::raw_cpu_set_new(),
+        }
+    }
+
+    /// Test to see if a CPU is in the `CpuSet`.
+    ///
+    /// `field` is the CPU id to test.
+    #[inline]
+    pub fn is_set(&self, field: usize) -> bool {
+        backend::process::cpu_set::CPU_ISSET(field, &self.cpu_set)
+    }
+
+    /// Add a CPU to `CpuSet`.
+    ///
+    /// `field` is the CPU id to add.
+    #[inline]
+    pub fn set(&mut self, field: usize) {
+        backend::process::cpu_set::CPU_SET(field, &mut self.cpu_set)
+    }
+
+    /// Remove a CPU from `CpuSet`.
+    ///
+    /// `field` is the CPU id to remove.
+    #[inline]
+    pub fn unset(&mut self, field: usize) {
+        backend::process::cpu_set::CPU_CLR(field, &mut self.cpu_set)
+    }
+
+    /// Count the number of CPUs set in the `CpuSet`.
+    #[cfg(linux_kernel)]
+    #[inline]
+    pub fn count(&self) -> u32 {
+        backend::process::cpu_set::CPU_COUNT(&self.cpu_set)
+    }
+
+    /// Zeroes the `CpuSet`.
+    #[inline]
+    pub fn clear(&mut self) {
+        backend::process::cpu_set::CPU_ZERO(&mut self.cpu_set)
+    }
+}
+
+impl Default for CpuSet {
+    #[inline]
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// `sched_setaffinity(pid, cpuset)`—Set a thread's CPU affinity mask.
+///
+/// `pid` is the thread ID to update. If pid is `None`, then the current thread
+/// is updated.
+///
+/// The `CpuSet` argument specifies the set of CPUs on which the thread will be
+/// eligible to run.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/sched_setaffinity.2.html
+#[inline]
+pub fn sched_setaffinity(pid: Option<Pid>, cpuset: &CpuSet) -> io::Result<()> {
+    backend::process::syscalls::sched_setaffinity(pid, &cpuset.cpu_set)
+}
+
+/// `sched_getaffinity(pid)`—Get a thread's CPU affinity mask.
+///
+/// `pid` is the thread ID to check. If pid is `None`, then the current thread
+/// is checked.
+///
+/// Returns the set of CPUs on which the thread is eligible to run.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/sched_getaffinity.2.html
+#[inline]
+pub fn sched_getaffinity(pid: Option<Pid>) -> io::Result<CpuSet> {
+    let mut cpuset = CpuSet::new();
+    backend::process::syscalls::sched_getaffinity(pid, &mut cpuset.cpu_set).and(Ok(cpuset))
+}
+
+/// `sched_getcpu()`—Get the CPU that the current thread is currently on.
+///
+/// # References
+///  - [Linux]
+///  - [DragonFly BSD]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/sched_getcpu.2.html
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=sched_getcpu&section=2
+// FreeBSD added `sched_getcpu` in 13.0.
+#[cfg(any(linux_kernel, target_os = "dragonfly"))]
+#[inline]
+pub fn sched_getcpu() -> usize {
+    backend::process::syscalls::sched_getcpu()
+}
diff --git a/vendor/rustix/src/process/sched_yield.rs b/vendor/rustix/src/process/sched_yield.rs
new file mode 100644
index 0000000..0324f67
--- /dev/null
+++ b/vendor/rustix/src/process/sched_yield.rs
@@ -0,0 +1,16 @@
+use crate::backend;
+
+/// `sched_yield()`—Hints to the OS that other processes should run.
+///
+/// This function always succeeds.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sched_yield.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/sched_yield.2.html
+#[inline]
+pub fn sched_yield() {
+    backend::process::syscalls::sched_yield()
+}
diff --git a/vendor/rustix/src/process/umask.rs b/vendor/rustix/src/process/umask.rs
new file mode 100644
index 0000000..01779d7
--- /dev/null
+++ b/vendor/rustix/src/process/umask.rs
@@ -0,0 +1,21 @@
+//! Umask support.
+
+#[cfg(feature = "fs")]
+use crate::backend;
+#[cfg(feature = "fs")]
+use crate::fs::Mode;
+
+/// `umask(mask)`—Set the process file creation mask.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/umask.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/umask.2.html
+#[cfg(feature = "fs")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "fs")))]
+#[inline]
+pub fn umask(mask: Mode) -> Mode {
+    backend::process::syscalls::umask(mask)
+}
diff --git a/vendor/rustix/src/process/wait.rs b/vendor/rustix/src/process/wait.rs
new file mode 100644
index 0000000..4d0e6e2
--- /dev/null
+++ b/vendor/rustix/src/process/wait.rs
@@ -0,0 +1,365 @@
+use crate::process::Pid;
+use crate::{backend, io};
+use bitflags::bitflags;
+
+#[cfg(target_os = "linux")]
+use crate::fd::BorrowedFd;
+
+#[cfg(linux_raw)]
+use crate::backend::process::wait::SiginfoExt;
+
+bitflags! {
+    /// Options for modifying the behavior of [`wait`]/[`waitpid`].
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct WaitOptions: u32 {
+        /// Return immediately if no child has exited.
+        const NOHANG = bitcast!(backend::process::wait::WNOHANG);
+        /// Return if a child has stopped (but not traced via [`ptrace`])
+        ///
+        /// [`ptrace`]: https://man7.org/linux/man-pages/man2/ptrace.2.html
+        const UNTRACED = bitcast!(backend::process::wait::WUNTRACED);
+        /// Return if a stopped child has been resumed by delivery of
+        /// [`Signal::Cont`].
+        const CONTINUED = bitcast!(backend::process::wait::WCONTINUED);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+#[cfg(not(any(target_os = "openbsd", target_os = "redox", target_os = "wasi")))]
+bitflags! {
+    /// Options for modifying the behavior of [`waitid`].
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct WaitidOptions: u32 {
+        /// Return immediately if no child has exited.
+        const NOHANG = bitcast!(backend::process::wait::WNOHANG);
+        /// Return if a stopped child has been resumed by delivery of
+        /// [`Signal::Cont`].
+        const CONTINUED = bitcast!(backend::process::wait::WCONTINUED);
+        /// Wait for processed that have exited.
+        const EXITED = bitcast!(backend::process::wait::WEXITED);
+        /// Keep processed in a waitable state.
+        const NOWAIT = bitcast!(backend::process::wait::WNOWAIT);
+        /// Wait for processes that have been stopped.
+        const STOPPED = bitcast!(backend::process::wait::WSTOPPED);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// The status of a child process after calling [`wait`]/[`waitpid`].
+#[derive(Debug, Clone, Copy)]
+#[repr(transparent)]
+pub struct WaitStatus(u32);
+
+impl WaitStatus {
+    /// Creates a `WaitStatus` out of an integer.
+    #[inline]
+    pub(crate) fn new(status: u32) -> Self {
+        Self(status)
+    }
+
+    /// Converts a `WaitStatus` into its raw representation as an integer.
+    #[inline]
+    pub const fn as_raw(self) -> u32 {
+        self.0
+    }
+
+    /// Returns whether the process is currently stopped.
+    #[inline]
+    pub fn stopped(self) -> bool {
+        backend::process::wait::WIFSTOPPED(self.0 as _)
+    }
+
+    /// Returns whether the process has exited normally.
+    #[inline]
+    pub fn exited(self) -> bool {
+        backend::process::wait::WIFEXITED(self.0 as _)
+    }
+
+    /// Returns whether the process was terminated by a signal.
+    #[inline]
+    pub fn signaled(self) -> bool {
+        backend::process::wait::WIFSIGNALED(self.0 as _)
+    }
+
+    /// Returns whether the process has continued from a job control stop.
+    #[inline]
+    pub fn continued(self) -> bool {
+        backend::process::wait::WIFCONTINUED(self.0 as _)
+    }
+
+    /// Returns the number of the signal that stopped the process, if the
+    /// process was stopped by a signal.
+    #[inline]
+    pub fn stopping_signal(self) -> Option<u32> {
+        if self.stopped() {
+            Some(backend::process::wait::WSTOPSIG(self.0 as _) as _)
+        } else {
+            None
+        }
+    }
+
+    /// Returns the exit status number returned by the process, if it exited
+    /// normally.
+    #[inline]
+    pub fn exit_status(self) -> Option<u32> {
+        if self.exited() {
+            Some(backend::process::wait::WEXITSTATUS(self.0 as _) as _)
+        } else {
+            None
+        }
+    }
+
+    /// Returns the number of the signal that terminated the process, if the
+    /// process was terminated by a signal.
+    #[inline]
+    pub fn terminating_signal(self) -> Option<u32> {
+        if self.signaled() {
+            Some(backend::process::wait::WTERMSIG(self.0 as _) as _)
+        } else {
+            None
+        }
+    }
+}
+
+/// The status of a process after calling [`waitid`].
+#[derive(Clone, Copy)]
+#[repr(transparent)]
+#[cfg(not(any(target_os = "openbsd", target_os = "redox", target_os = "wasi")))]
+pub struct WaitidStatus(pub(crate) backend::c::siginfo_t);
+
+#[cfg(not(any(target_os = "openbsd", target_os = "redox", target_os = "wasi")))]
+impl WaitidStatus {
+    /// Returns whether the process is currently stopped.
+    #[inline]
+    pub fn stopped(&self) -> bool {
+        self.si_code() == backend::c::CLD_STOPPED
+    }
+
+    /// Returns whether the process is currently trapped.
+    #[inline]
+    pub fn trapped(&self) -> bool {
+        self.si_code() == backend::c::CLD_TRAPPED
+    }
+
+    /// Returns whether the process has exited normally.
+    #[inline]
+    pub fn exited(&self) -> bool {
+        self.si_code() == backend::c::CLD_EXITED
+    }
+
+    /// Returns whether the process was terminated by a signal and did not
+    /// create a core file.
+    #[inline]
+    pub fn killed(&self) -> bool {
+        self.si_code() == backend::c::CLD_KILLED
+    }
+
+    /// Returns whether the process was terminated by a signal and did create a
+    /// core file.
+    #[inline]
+    pub fn dumped(&self) -> bool {
+        self.si_code() == backend::c::CLD_DUMPED
+    }
+
+    /// Returns whether the process has continued from a job control stop.
+    #[inline]
+    pub fn continued(&self) -> bool {
+        self.si_code() == backend::c::CLD_CONTINUED
+    }
+
+    /// Returns the number of the signal that stopped the process, if the
+    /// process was stopped by a signal.
+    #[inline]
+    #[cfg(not(any(target_os = "emscripten", target_os = "fuchsia", target_os = "netbsd")))]
+    pub fn stopping_signal(&self) -> Option<u32> {
+        if self.stopped() {
+            Some(self.si_status() as _)
+        } else {
+            None
+        }
+    }
+
+    /// Returns the number of the signal that trapped the process, if the
+    /// process was trapped by a signal.
+    #[inline]
+    #[cfg(not(any(target_os = "emscripten", target_os = "fuchsia", target_os = "netbsd")))]
+    pub fn trapping_signal(&self) -> Option<u32> {
+        if self.trapped() {
+            Some(self.si_status() as _)
+        } else {
+            None
+        }
+    }
+
+    /// Returns the exit status number returned by the process, if it exited
+    /// normally.
+    #[inline]
+    #[cfg(not(any(target_os = "emscripten", target_os = "fuchsia", target_os = "netbsd")))]
+    pub fn exit_status(&self) -> Option<u32> {
+        if self.exited() {
+            Some(self.si_status() as _)
+        } else {
+            None
+        }
+    }
+
+    /// Returns the number of the signal that terminated the process, if the
+    /// process was terminated by a signal.
+    #[inline]
+    #[cfg(not(any(target_os = "emscripten", target_os = "fuchsia", target_os = "netbsd")))]
+    pub fn terminating_signal(&self) -> Option<u32> {
+        if self.killed() || self.dumped() {
+            Some(self.si_status() as _)
+        } else {
+            None
+        }
+    }
+
+    /// Returns a reference to the raw platform-specific `siginfo_t` struct.
+    #[inline]
+    pub const fn as_raw(&self) -> &backend::c::siginfo_t {
+        &self.0
+    }
+
+    #[cfg(linux_raw)]
+    fn si_code(&self) -> u32 {
+        self.0.si_code() as u32 // CLD_ consts are unsigned
+    }
+
+    #[cfg(not(linux_raw))]
+    fn si_code(&self) -> backend::c::c_int {
+        self.0.si_code
+    }
+
+    #[cfg(not(any(target_os = "emscripten", target_os = "fuchsia", target_os = "netbsd")))]
+    #[allow(unsafe_code)]
+    fn si_status(&self) -> backend::c::c_int {
+        // SAFETY: POSIX [specifies] that the `siginfo_t` returned by a
+        // `waitid` call always has a valid `si_status` value.
+        //
+        // [specifies]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/signal.h.html
+        unsafe { self.0.si_status() }
+    }
+}
+
+/// The identifier to wait on in a call to [`waitid`].
+#[cfg(not(any(target_os = "openbsd", target_os = "redox", target_os = "wasi")))]
+#[derive(Debug, Clone)]
+#[non_exhaustive]
+pub enum WaitId<'a> {
+    /// Wait on all processes.
+    #[doc(alias = "P_ALL")]
+    All,
+
+    /// Wait for a specific process ID.
+    #[doc(alias = "P_PID")]
+    Pid(Pid),
+
+    /// Wait for a specific process group ID, or the calling process' group ID.
+    #[doc(alias = "P_PGID")]
+    Pgid(Option<Pid>),
+
+    /// Wait for a specific process file descriptor.
+    #[cfg(target_os = "linux")]
+    #[doc(alias = "P_PIDFD")]
+    PidFd(BorrowedFd<'a>),
+
+    /// Eat the lifetime for non-Linux platforms.
+    #[doc(hidden)]
+    #[cfg(not(target_os = "linux"))]
+    __EatLifetime(core::marker::PhantomData<&'a ()>),
+}
+
+/// `waitpid(pid, waitopts)`—Wait for a specific process to change state.
+///
+/// If the pid is `None`, the call will wait for any child process whose
+/// process group id matches that of the calling process.
+///
+/// Otherwise, the call will wait for the child process with the given pid.
+///
+/// On Success, returns the status of the selected process.
+///
+/// If `NOHANG` was specified in the options, and the selected child process
+/// didn't change state, returns `None`.
+///
+/// # Bugs
+///
+/// This function does not currently support waiting for given process group
+/// (the < 0 case of `waitpid`); to do that, currently the [`waitpgid`] or
+/// [`waitid`] function must be used.
+///
+/// This function does not currently support waiting for any process (the
+/// `-1` case of `waitpid`); to do that, currently the [`wait`] function must
+/// be used.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/wait.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/waitpid.2.html
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub fn waitpid(pid: Option<Pid>, waitopts: WaitOptions) -> io::Result<Option<WaitStatus>> {
+    Ok(backend::process::syscalls::waitpid(pid, waitopts)?.map(|(_, status)| status))
+}
+
+/// `waitpid(-pgid, waitopts)`—Wait for a process in a specific process group
+/// to change state.
+///
+/// The call will wait for any child process with the given pgid.
+///
+/// On Success, returns the status of the selected process.
+///
+/// If `NOHANG` was specified in the options, and no selected child process
+/// changed state, returns `None`.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/wait.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/waitpid.2.html
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub fn waitpgid(pgid: Pid, waitopts: WaitOptions) -> io::Result<Option<WaitStatus>> {
+    Ok(backend::process::syscalls::waitpgid(pgid, waitopts)?.map(|(_, status)| status))
+}
+
+/// `wait(waitopts)`—Wait for any of the children of calling process to
+/// change state.
+///
+/// On success, returns the pid of the child process whose state changed, and
+/// the status of said process.
+///
+/// If `NOHANG` was specified in the options, and the selected child process
+/// didn't change state, returns `None`.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/wait.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/waitpid.2.html
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub fn wait(waitopts: WaitOptions) -> io::Result<Option<(Pid, WaitStatus)>> {
+    backend::process::syscalls::wait(waitopts)
+}
+
+/// `waitid(_, _, _, opts)`—Wait for the specified child process to change
+/// state.
+#[cfg(not(any(target_os = "openbsd", target_os = "redox", target_os = "wasi")))]
+#[inline]
+pub fn waitid<'a>(
+    id: impl Into<WaitId<'a>>,
+    options: WaitidOptions,
+) -> io::Result<Option<WaitidStatus>> {
+    backend::process::syscalls::waitid(id.into(), options)
+}
diff --git a/vendor/rustix/src/procfs.rs b/vendor/rustix/src/procfs.rs
new file mode 100644
index 0000000..38f0911
--- /dev/null
+++ b/vendor/rustix/src/procfs.rs
@@ -0,0 +1,517 @@
+//! Utilities for working with `/proc`, where Linux's `procfs` is typically
+//! mounted.
+//!
+//! `/proc` serves as an adjunct to Linux's main syscall surface area,
+//! providing additional features with an awkward interface.
+//!
+//! This module does a considerable amount of work to determine whether `/proc`
+//! is mounted, with actual `procfs`, and without any additional mount points
+//! on top of the paths we open.
+//!
+//! Why all the effort to detect bind mount points? People are doing all kinds
+//! of things with Linux containers these days, with many different privilege
+//! schemes, and we want to avoid making any unnecessary assumptions. Rustix
+//! and its users will sometimes use procfs *implicitly* (when Linux gives them
+//! no better options), in ways that aren't obvious from their public APIs.
+//! These filesystem accesses might not be visible to someone auditing the main
+//! code of an application for places which may be influenced by the filesystem
+//! namespace. So with the checking here, they may fail, but they won't be able
+//! to succeed with bogus results.
+
+use crate::fd::{AsFd, BorrowedFd, OwnedFd};
+use crate::ffi::CStr;
+use crate::fs::{
+    fstat, fstatfs, major, openat, renameat, FileType, FsWord, Mode, OFlags, RawDir, Stat, CWD,
+    PROC_SUPER_MAGIC,
+};
+use crate::io;
+use crate::path::DecInt;
+#[cfg(feature = "rustc-dep-of-std")]
+use core::lazy::OnceCell;
+use core::mem::MaybeUninit;
+#[cfg(not(feature = "rustc-dep-of-std"))]
+use once_cell::sync::OnceCell;
+
+/// Linux's procfs always uses inode 1 for its root directory.
+const PROC_ROOT_INO: u64 = 1;
+
+// Identify an entry within "/proc", to determine which anomalies to check for.
+#[derive(Copy, Clone, Debug)]
+enum Kind {
+    Proc,
+    Pid,
+    Fd,
+    File,
+    Symlink,
+}
+
+/// Check a subdirectory of "/proc" for anomalies.
+fn check_proc_entry(
+    kind: Kind,
+    entry: BorrowedFd<'_>,
+    proc_stat: Option<&Stat>,
+) -> io::Result<Stat> {
+    let entry_stat = fstat(entry)?;
+    check_proc_entry_with_stat(kind, entry, entry_stat, proc_stat)
+}
+
+/// Check a subdirectory of "/proc" for anomalies, using the provided `Stat`.
+fn check_proc_entry_with_stat(
+    kind: Kind,
+    entry: BorrowedFd<'_>,
+    entry_stat: Stat,
+    proc_stat: Option<&Stat>,
+) -> io::Result<Stat> {
+    // Check the filesystem magic.
+    check_procfs(entry)?;
+
+    match kind {
+        Kind::Proc => check_proc_root(entry, &entry_stat)?,
+        Kind::Pid | Kind::Fd => check_proc_subdir(entry, &entry_stat, proc_stat)?,
+        Kind::File => check_proc_file(&entry_stat, proc_stat)?,
+        Kind::Symlink => check_proc_symlink(&entry_stat, proc_stat)?,
+    }
+
+    // "/proc" directories are typically mounted r-xr-xr-x.
+    // "/proc/self/fd" is r-x------. Allow them to have fewer permissions, but
+    // not more.
+    match kind {
+        Kind::Symlink => {
+            // On Linux, symlinks don't have their own permissions.
+        }
+        _ => {
+            let expected_mode = if let Kind::Fd = kind { 0o500 } else { 0o555 };
+            if entry_stat.st_mode & 0o777 & !expected_mode != 0 {
+                return Err(io::Errno::NOTSUP);
+            }
+        }
+    }
+
+    match kind {
+        Kind::Fd => {
+            // Check that the "/proc/self/fd" directory doesn't have any
+            // extraneous links into it (which might include unexpected
+            // subdirectories).
+            if entry_stat.st_nlink != 2 {
+                return Err(io::Errno::NOTSUP);
+            }
+        }
+        Kind::Pid | Kind::Proc => {
+            // Check that the "/proc" and "/proc/self" directories aren't
+            // empty.
+            if entry_stat.st_nlink <= 2 {
+                return Err(io::Errno::NOTSUP);
+            }
+        }
+        Kind::File => {
+            // Check that files in procfs don't have extraneous hard links to
+            // them (which might indicate hard links to other things).
+            if entry_stat.st_nlink != 1 {
+                return Err(io::Errno::NOTSUP);
+            }
+        }
+        Kind::Symlink => {
+            // Check that symlinks in procfs don't have extraneous hard links
+            // to them (which might indicate hard links to other things).
+            if entry_stat.st_nlink != 1 {
+                return Err(io::Errno::NOTSUP);
+            }
+        }
+    }
+
+    Ok(entry_stat)
+}
+
+fn check_proc_root(entry: BorrowedFd<'_>, stat: &Stat) -> io::Result<()> {
+    // We use `O_DIRECTORY` for proc directories, so open should fail if we
+    // don't get a directory when we expect one.
+    assert_eq!(FileType::from_raw_mode(stat.st_mode), FileType::Directory);
+
+    // Check the root inode number.
+    if stat.st_ino != PROC_ROOT_INO {
+        return Err(io::Errno::NOTSUP);
+    }
+
+    // Proc is a non-device filesystem, so check for major number 0.
+    // <https://www.kernel.org/doc/Documentation/admin-guide/devices.txt>
+    if major(stat.st_dev) != 0 {
+        return Err(io::Errno::NOTSUP);
+    }
+
+    // Check that "/proc" is a mountpoint.
+    if !is_mountpoint(entry) {
+        return Err(io::Errno::NOTSUP);
+    }
+
+    Ok(())
+}
+
+fn check_proc_subdir(
+    entry: BorrowedFd<'_>,
+    stat: &Stat,
+    proc_stat: Option<&Stat>,
+) -> io::Result<()> {
+    // We use `O_DIRECTORY` for proc directories, so open should fail if we
+    // don't get a directory when we expect one.
+    assert_eq!(FileType::from_raw_mode(stat.st_mode), FileType::Directory);
+
+    check_proc_nonroot(stat, proc_stat)?;
+
+    // Check that subdirectories of "/proc" are not mount points.
+    if is_mountpoint(entry) {
+        return Err(io::Errno::NOTSUP);
+    }
+
+    Ok(())
+}
+
+fn check_proc_file(stat: &Stat, proc_stat: Option<&Stat>) -> io::Result<()> {
+    // Check that we have a regular file.
+    if FileType::from_raw_mode(stat.st_mode) != FileType::RegularFile {
+        return Err(io::Errno::NOTSUP);
+    }
+
+    check_proc_nonroot(stat, proc_stat)?;
+
+    Ok(())
+}
+
+fn check_proc_symlink(stat: &Stat, proc_stat: Option<&Stat>) -> io::Result<()> {
+    // Check that we have a symbolic link.
+    if FileType::from_raw_mode(stat.st_mode) != FileType::Symlink {
+        return Err(io::Errno::NOTSUP);
+    }
+
+    check_proc_nonroot(stat, proc_stat)?;
+
+    Ok(())
+}
+
+fn check_proc_nonroot(stat: &Stat, proc_stat: Option<&Stat>) -> io::Result<()> {
+    // Check that we haven't been linked back to the root of "/proc".
+    if stat.st_ino == PROC_ROOT_INO {
+        return Err(io::Errno::NOTSUP);
+    }
+
+    // Check that we're still in procfs.
+    if stat.st_dev != proc_stat.unwrap().st_dev {
+        return Err(io::Errno::NOTSUP);
+    }
+
+    Ok(())
+}
+
+/// Check that `file` is opened on a `procfs` filesystem.
+fn check_procfs(file: BorrowedFd<'_>) -> io::Result<()> {
+    let statfs = fstatfs(file)?;
+    let f_type = statfs.f_type;
+    if f_type != FsWord::from(PROC_SUPER_MAGIC) {
+        return Err(io::Errno::NOTSUP);
+    }
+
+    Ok(())
+}
+
+/// Check whether the given directory handle is a mount point.
+fn is_mountpoint(file: BorrowedFd<'_>) -> bool {
+    // We use a `renameat` call that would otherwise fail, but which fails with
+    // `XDEV` first if it would cross a mount point.
+    let err = renameat(file, cstr!("../."), file, cstr!(".")).unwrap_err();
+    match err {
+        io::Errno::XDEV => true,  // the rename failed due to crossing a mount point
+        io::Errno::BUSY => false, // the rename failed normally
+        _ => panic!("Unexpected error from `renameat`: {:?}", err),
+    }
+}
+
+/// Open a directory in `/proc`, mapping all errors to `io::Errno::NOTSUP`.
+fn proc_opendirat<P: crate::path::Arg, Fd: AsFd>(dirfd: Fd, path: P) -> io::Result<OwnedFd> {
+    // We don't add `PATH` here because that disables `DIRECTORY`. And we don't
+    // add `NOATIME` for the same reason as the comment in `open_and_check_file`.
+    let oflags = OFlags::NOFOLLOW | OFlags::DIRECTORY | OFlags::CLOEXEC | OFlags::NOCTTY;
+    openat(dirfd, path, oflags, Mode::empty()).map_err(|_err| io::Errno::NOTSUP)
+}
+
+/// Returns a handle to Linux's `/proc` directory.
+///
+/// This ensures that `/proc` is procfs, that nothing is mounted on top of it,
+/// and that it looks normal. It also returns the `Stat` of `/proc`.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man5/proc.5.html
+fn proc() -> io::Result<(BorrowedFd<'static>, &'static Stat)> {
+    static PROC: StaticFd = StaticFd::new();
+
+    // `OnceBox` is "racey" in that the initialization function may run
+    // multiple times. We're ok with that, since the initialization function
+    // has no side effects.
+    PROC.get_or_try_init(|| {
+        // Open "/proc".
+        let proc = proc_opendirat(CWD, cstr!("/proc"))?;
+        let proc_stat =
+            check_proc_entry(Kind::Proc, proc.as_fd(), None).map_err(|_err| io::Errno::NOTSUP)?;
+
+        Ok(new_static_fd(proc, proc_stat))
+    })
+    .map(|(fd, stat)| (fd.as_fd(), stat))
+}
+
+/// Returns a handle to Linux's `/proc/self` directory.
+///
+/// This ensures that `/proc/self` is procfs, that nothing is mounted on top of
+/// it, and that it looks normal. It also returns the `Stat` of `/proc/self`.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man5/proc.5.html
+#[allow(unsafe_code)]
+fn proc_self() -> io::Result<(BorrowedFd<'static>, &'static Stat)> {
+    static PROC_SELF: StaticFd = StaticFd::new();
+
+    // The init function here may run multiple times; see above.
+    PROC_SELF
+        .get_or_try_init(|| {
+            let (proc, proc_stat) = proc()?;
+
+            // `getpid` would return our pid in our own pid namespace, so
+            // instead use `readlink` on the `self` symlink to learn our pid in
+            // the procfs namespace.
+            let self_symlink = open_and_check_file(proc, proc_stat, cstr!("self"), Kind::Symlink)?;
+            let mut buf = [MaybeUninit::<u8>::uninit(); 20];
+            let len = crate::backend::fs::syscalls::readlinkat(
+                self_symlink.as_fd(),
+                cstr!(""),
+                &mut buf,
+            )?;
+            let pid: &[u8] = unsafe { core::mem::transmute(&buf[..len]) };
+
+            // Open "/proc/self". Use our pid to compute the name rather than
+            // literally using "self", as "self" is a symlink.
+            let proc_self = proc_opendirat(proc, pid)?;
+            let proc_self_stat = check_proc_entry(Kind::Pid, proc_self.as_fd(), Some(proc_stat))
+                .map_err(|_err| io::Errno::NOTSUP)?;
+
+            Ok(new_static_fd(proc_self, proc_self_stat))
+        })
+        .map(|(owned, stat)| (owned.as_fd(), stat))
+}
+
+/// Returns a handle to Linux's `/proc/self/fd` directory.
+///
+/// This ensures that `/proc/self/fd` is `procfs`, that nothing is mounted on
+/// top of it, and that it looks normal.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man5/proc.5.html
+#[cfg_attr(doc_cfg, doc(cfg(feature = "procfs")))]
+pub fn proc_self_fd() -> io::Result<BorrowedFd<'static>> {
+    static PROC_SELF_FD: StaticFd = StaticFd::new();
+
+    // The init function here may run multiple times; see above.
+    PROC_SELF_FD
+        .get_or_try_init(|| {
+            let (_, proc_stat) = proc()?;
+
+            let (proc_self, _proc_self_stat) = proc_self()?;
+
+            // Open "/proc/self/fd".
+            let proc_self_fd = proc_opendirat(proc_self, cstr!("fd"))?;
+            let proc_self_fd_stat =
+                check_proc_entry(Kind::Fd, proc_self_fd.as_fd(), Some(proc_stat))
+                    .map_err(|_err| io::Errno::NOTSUP)?;
+
+            Ok(new_static_fd(proc_self_fd, proc_self_fd_stat))
+        })
+        .map(|(owned, _stat)| owned.as_fd())
+}
+
+type StaticFd = OnceCell<(OwnedFd, Stat)>;
+
+#[inline]
+fn new_static_fd(fd: OwnedFd, stat: Stat) -> (OwnedFd, Stat) {
+    (fd, stat)
+}
+
+/// Returns a handle to Linux's `/proc/self/fdinfo` directory.
+///
+/// This ensures that `/proc/self/fdinfo` is `procfs`, that nothing is mounted
+/// on top of it, and that it looks normal. It also returns the `Stat` of
+/// `/proc/self/fd`.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man5/proc.5.html
+fn proc_self_fdinfo() -> io::Result<(BorrowedFd<'static>, &'static Stat)> {
+    static PROC_SELF_FDINFO: StaticFd = StaticFd::new();
+
+    PROC_SELF_FDINFO
+        .get_or_try_init(|| {
+            let (_, proc_stat) = proc()?;
+
+            let (proc_self, _proc_self_stat) = proc_self()?;
+
+            // Open "/proc/self/fdinfo".
+            let proc_self_fdinfo = proc_opendirat(proc_self, cstr!("fdinfo"))?;
+            let proc_self_fdinfo_stat =
+                check_proc_entry(Kind::Fd, proc_self_fdinfo.as_fd(), Some(proc_stat))
+                    .map_err(|_err| io::Errno::NOTSUP)?;
+
+            Ok((proc_self_fdinfo, proc_self_fdinfo_stat))
+        })
+        .map(|(owned, stat)| (owned.as_fd(), stat))
+}
+
+/// Returns a handle to a Linux `/proc/self/fdinfo/<fd>` file.
+///
+/// This ensures that `/proc/self/fdinfo/<fd>` is `procfs`, that nothing is
+/// mounted on top of it, and that it looks normal.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man5/proc.5.html
+#[inline]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "procfs")))]
+pub fn proc_self_fdinfo_fd<Fd: AsFd>(fd: Fd) -> io::Result<OwnedFd> {
+    _proc_self_fdinfo(fd.as_fd())
+}
+
+fn _proc_self_fdinfo(fd: BorrowedFd<'_>) -> io::Result<OwnedFd> {
+    let (proc_self_fdinfo, proc_self_fdinfo_stat) = proc_self_fdinfo()?;
+    let fd_str = DecInt::from_fd(fd);
+    open_and_check_file(
+        proc_self_fdinfo,
+        proc_self_fdinfo_stat,
+        fd_str.as_c_str(),
+        Kind::File,
+    )
+}
+
+/// Returns a handle to a Linux `/proc/self/pagemap` file.
+///
+/// This ensures that `/proc/self/pagemap` is `procfs`, that nothing is
+/// mounted on top of it, and that it looks normal.
+///
+/// # References
+///  - [Linux]
+///  - [Linux pagemap]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man5/proc.5.html
+/// [Linux pagemap]: https://www.kernel.org/doc/Documentation/vm/pagemap.txt
+#[inline]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "procfs")))]
+pub fn proc_self_pagemap() -> io::Result<OwnedFd> {
+    proc_self_file(cstr!("pagemap"))
+}
+
+/// Returns a handle to a Linux `/proc/self/maps` file.
+///
+/// This ensures that `/proc/self/maps` is `procfs`, that nothing is
+/// mounted on top of it, and that it looks normal.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man5/proc.5.html
+#[inline]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "procfs")))]
+pub fn proc_self_maps() -> io::Result<OwnedFd> {
+    proc_self_file(cstr!("maps"))
+}
+
+/// Returns a handle to a Linux `/proc/self/status` file.
+///
+/// This ensures that `/proc/self/status` is `procfs`, that nothing is
+/// mounted on top of it, and that it looks normal.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man5/proc.5.html
+#[inline]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "procfs")))]
+pub fn proc_self_status() -> io::Result<OwnedFd> {
+    proc_self_file(cstr!("status"))
+}
+
+/// Open a file under `/proc/self`.
+fn proc_self_file(name: &CStr) -> io::Result<OwnedFd> {
+    let (proc_self, proc_self_stat) = proc_self()?;
+    open_and_check_file(proc_self, proc_self_stat, name, Kind::File)
+}
+
+/// Open a procfs file within in `dir` and check it for bind mounts.
+fn open_and_check_file(
+    dir: BorrowedFd<'_>,
+    dir_stat: &Stat,
+    name: &CStr,
+    kind: Kind,
+) -> io::Result<OwnedFd> {
+    let (_, proc_stat) = proc()?;
+
+    // Don't use `NOATIME`, because it [requires us to own the file], and when
+    // a process sets itself non-dumpable Linux changes the user:group of its
+    // `/proc/<pid>` files [to root:root].
+    //
+    // [requires us to own the file]: https://man7.org/linux/man-pages/man2/openat.2.html
+    // [to root:root]: https://man7.org/linux/man-pages/man5/proc.5.html
+    let mut oflags = OFlags::RDONLY | OFlags::CLOEXEC | OFlags::NOFOLLOW | OFlags::NOCTTY;
+    if let Kind::Symlink = kind {
+        // Open symlinks with `O_PATH`.
+        oflags |= OFlags::PATH;
+    }
+    let file = openat(dir, name, oflags, Mode::empty()).map_err(|_err| io::Errno::NOTSUP)?;
+    let file_stat = fstat(&file)?;
+
+    // `is_mountpoint` only works on directory mount points, not file mount
+    // points. To detect file mount points, scan the parent directory to see if
+    // we can find a regular file with an inode and name that matches the file
+    // we just opened. If we can't find it, there could be a file bind mount on
+    // top of the file we want.
+    //
+    // TODO: With Linux 5.8 we might be able to use `statx` and
+    // `STATX_ATTR_MOUNT_ROOT` to detect mountpoints directly instead of doing
+    // this scanning.
+
+    let expected_type = match kind {
+        Kind::File => FileType::RegularFile,
+        Kind::Symlink => FileType::Symlink,
+        _ => unreachable!(),
+    };
+
+    let mut found_file = false;
+    let mut found_dot = false;
+
+    let mut buf = [MaybeUninit::uninit(); 2048];
+    let mut iter = RawDir::new(dir, &mut buf);
+    while let Some(entry) = iter.next() {
+        let entry = entry.map_err(|_err| io::Errno::NOTSUP)?;
+        if entry.ino() == file_stat.st_ino
+            && entry.file_type() == expected_type
+            && entry.file_name() == name
+        {
+            // We found the file. Proceed to check the file handle.
+            let _ = check_proc_entry_with_stat(kind, file.as_fd(), file_stat, Some(proc_stat))?;
+
+            found_file = true;
+        } else if entry.ino() == dir_stat.st_ino
+            && entry.file_type() == FileType::Directory
+            && entry.file_name() == cstr!(".")
+        {
+            // We found ".", and it's the right ".".
+            found_dot = true;
+        }
+    }
+
+    if found_file && found_dot {
+        Ok(file)
+    } else {
+        Err(io::Errno::NOTSUP)
+    }
+}
diff --git a/vendor/rustix/src/pty.rs b/vendor/rustix/src/pty.rs
new file mode 100644
index 0000000..926ebf7
--- /dev/null
+++ b/vendor/rustix/src/pty.rs
@@ -0,0 +1,207 @@
+//! Pseudoterminal operations.
+//!
+//! For the `openpty` and `login_tty` functions, see the
+//! [rustix-openpty crate].
+//!
+//! [rustix-openpty crate]: https://crates.io/crates/rustix-openpty
+
+#![allow(unsafe_code)]
+
+use crate::backend::c;
+use crate::fd::{AsFd, OwnedFd};
+use crate::fs::OFlags;
+use crate::{backend, io};
+#[cfg(all(
+    feature = "alloc",
+    any(apple, linux_like, target_os = "freebsd", target_os = "fuchsia")
+))]
+use {crate::ffi::CString, alloc::vec::Vec};
+
+#[cfg(target_os = "linux")]
+use crate::{fd::FromRawFd, ioctl};
+
+bitflags::bitflags! {
+    /// `O_*` flags for use with [`openpt`] and [`ioctl_tiocgptpeer`].
+    ///
+    /// [`ioctl_tiocgptpeer`]: https://docs.rs/rustix/*/x86_64-unknown-linux-gnu/rustix/pty/fn.ioctl_tiocgptpeer.html
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct OpenptFlags: u32 {
+        /// `O_RDWR`
+        const RDWR = c::O_RDWR as c::c_uint;
+
+        /// `O_NOCTTY`
+        #[cfg(not(any(target_os = "espidf", target_os = "l4re", target_os = "redox", target_os = "vita")))]
+        const NOCTTY = c::O_NOCTTY as c::c_uint;
+
+        /// `O_CLOEXEC`
+        ///
+        /// The standard `posix_openpt` function doesn't support `CLOEXEC`, but
+        /// rustix supports it on Linux, and FreeBSD and NetBSD support it.
+        #[cfg(any(linux_kernel, target_os = "freebsd", target_os = "netbsd"))]
+        const CLOEXEC = c::O_CLOEXEC as c::c_uint;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+impl From<OpenptFlags> for OFlags {
+    #[inline]
+    fn from(flags: OpenptFlags) -> Self {
+        // `OpenptFlags` is a subset of `OFlags`.
+        Self::from_bits_retain(flags.bits() as _)
+    }
+}
+
+/// `posix_openpt(flags)`—Open a pseudoterminal device.
+///
+/// On Linux, an additional `CLOEXEC` flag value may be passed to request the
+/// close-on-exec flag be set.
+///
+/// On Linux, if the system has no free pseudoterminals available, the
+/// underlying system call fails with [`io::Errno::NOSPC`], however this rustix
+/// function translates that to [`io::Errno::AGAIN`], so that the linux_raw and
+/// libc backends have the same behavior.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [FreeBSD]
+///  - [DragonFly BSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_openpt.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/posix_openpt.3.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/posix_openpt.3.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=posix_openpt&sektion=2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=posix_openpt&section=3
+/// [NetBSD]: https://man.netbsd.org/posix_openpt.3
+/// [OpenBSD]: https://man.openbsd.org/posix_openpt
+/// [illumos]: https://illumos.org/man/3C/posix_openpt
+#[inline]
+#[doc(alias = "posix_openpt")]
+pub fn openpt(flags: OpenptFlags) -> io::Result<OwnedFd> {
+    // On Linux, open the device ourselves so that we can support `CLOEXEC`.
+    #[cfg(linux_kernel)]
+    {
+        use crate::fs::{open, Mode};
+        match open(cstr!("/dev/ptmx"), flags.into(), Mode::empty()) {
+            // Match libc `openat` behavior with `ENOSPC`.
+            Err(io::Errno::NOSPC) => Err(io::Errno::AGAIN),
+            otherwise => otherwise,
+        }
+    }
+
+    // On all other platforms, use `openpt`.
+    #[cfg(not(linux_kernel))]
+    {
+        backend::pty::syscalls::openpt(flags)
+    }
+}
+
+/// `ptsname(fd)`—Return the name of a pseudoterminal.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/ptsname.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/ptsname.3.html
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Allocation.html#index-ptsname
+#[cfg(all(
+    feature = "alloc",
+    any(apple, linux_like, target_os = "freebsd", target_os = "fuchsia")
+))]
+#[inline]
+#[doc(alias = "ptsname_r")]
+pub fn ptsname<Fd: AsFd, B: Into<Vec<u8>>>(fd: Fd, reuse: B) -> io::Result<CString> {
+    backend::pty::syscalls::ptsname(fd.as_fd(), reuse.into())
+}
+
+/// `unlockpt(fd)`—Unlock a pseudoterminal.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/unlockpt.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/unlockpt.3.html
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Allocation.html#index-unlockpt
+#[inline]
+pub fn unlockpt<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    backend::pty::syscalls::unlockpt(fd.as_fd())
+}
+
+/// `grantpt(fd)`—Grant access to the user side of a pseudoterminal.
+///
+/// On Linux, calling this function has no effect, as the kernel is expected to
+/// grant the appropriate access. On all other platorms, this function has
+/// unspecified behavior if the calling process has a [`Signal::Child`] signal
+/// handler installed.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/grantpt.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/grantpt.3.html
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Allocation.html#index-grantpt
+/// [`Signal::Child`]: crate::process::Signal::Child
+#[inline]
+pub fn grantpt<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    #[cfg(not(linux_kernel))]
+    {
+        backend::pty::syscalls::grantpt(fd.as_fd())
+    }
+
+    // On Linux, we assume the kernel has already granted the needed
+    // permissions to the user side of the pseudoterminal.
+    #[cfg(linux_kernel)]
+    {
+        let _ = fd;
+        Ok(())
+    }
+}
+
+/// `ioctl(fd, TIOCGPTPEER)`—Open the user side of a pseduoterminal.
+///
+/// This function is currently only implemented on Linux.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/ioctl_tty.2.html
+#[cfg(target_os = "linux")]
+#[inline]
+pub fn ioctl_tiocgptpeer<Fd: AsFd>(fd: Fd, flags: OpenptFlags) -> io::Result<OwnedFd> {
+    unsafe { ioctl::ioctl(fd, Tiocgptpeer(flags)) }
+}
+
+#[cfg(target_os = "linux")]
+struct Tiocgptpeer(OpenptFlags);
+
+#[cfg(target_os = "linux")]
+unsafe impl ioctl::Ioctl for Tiocgptpeer {
+    type Output = OwnedFd;
+
+    const IS_MUTATING: bool = false;
+    const OPCODE: ioctl::Opcode = ioctl::Opcode::old(c::TIOCGPTPEER as ioctl::RawOpcode);
+
+    fn as_ptr(&mut self) -> *mut c::c_void {
+        self.0.bits() as *mut c::c_void
+    }
+
+    unsafe fn output_from_ptr(
+        ret: ioctl::IoctlOutput,
+        _arg: *mut c::c_void,
+    ) -> io::Result<Self::Output> {
+        Ok(OwnedFd::from_raw_fd(ret))
+    }
+}
diff --git a/vendor/rustix/src/rand/getrandom.rs b/vendor/rustix/src/rand/getrandom.rs
new file mode 100644
index 0000000..c7f117a
--- /dev/null
+++ b/vendor/rustix/src/rand/getrandom.rs
@@ -0,0 +1,43 @@
+#![allow(unsafe_code)]
+
+use crate::buffer::split_init;
+use crate::{backend, io};
+use core::mem::MaybeUninit;
+
+pub use backend::rand::types::GetRandomFlags;
+
+/// `getrandom(buf, flags)`—Reads a sequence of random bytes.
+///
+/// This is a very low-level API which may be difficult to use correctly. Most
+/// users should prefer to use [`getrandom`] or [`rand`] APIs instead.
+///
+/// [`getrandom`]: https://crates.io/crates/getrandom
+/// [`rand`]: https://crates.io/crates/rand
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/getrandom.2.html
+#[inline]
+pub fn getrandom(buf: &mut [u8], flags: GetRandomFlags) -> io::Result<usize> {
+    unsafe { backend::rand::syscalls::getrandom(buf.as_mut_ptr(), buf.len(), flags) }
+}
+
+/// `getrandom(buf, flags)`—Reads a sequence of random bytes.
+///
+/// This is identical to [`getrandom`], except that it can read into
+/// uninitialized memory. It returns the slice that was initialized by this
+/// function and the slice that remains uninitialized.
+#[inline]
+pub fn getrandom_uninit(
+    buf: &mut [MaybeUninit<u8>],
+    flags: GetRandomFlags,
+) -> io::Result<(&mut [u8], &mut [MaybeUninit<u8>])> {
+    // Get number of initialized bytes.
+    let length = unsafe {
+        backend::rand::syscalls::getrandom(buf.as_mut_ptr() as *mut u8, buf.len(), flags)
+    };
+
+    // Split into the initialized and uninitialized portions.
+    Ok(unsafe { split_init(buf, length?) })
+}
diff --git a/vendor/rustix/src/rand/mod.rs b/vendor/rustix/src/rand/mod.rs
new file mode 100644
index 0000000..ec4c112
--- /dev/null
+++ b/vendor/rustix/src/rand/mod.rs
@@ -0,0 +1,7 @@
+//! Random-related operations.
+
+#[cfg(linux_kernel)]
+mod getrandom;
+
+#[cfg(linux_kernel)]
+pub use getrandom::{getrandom, getrandom_uninit, GetRandomFlags};
diff --git a/vendor/rustix/src/runtime.rs b/vendor/rustix/src/runtime.rs
new file mode 100644
index 0000000..bd3eed2
--- /dev/null
+++ b/vendor/rustix/src/runtime.rs
@@ -0,0 +1,581 @@
+//! Experimental low-level implementation details for libc-like runtime
+//! libraries such as [Origin].
+//!
+//! Do not use the functions in this module unless you've read all of their
+//! code. They don't always behave the same way as functions with similar names
+//! in `libc`. Sometimes information about the differences is included in the
+//! Linux documentation under “C library/kernel differences” sections. And, if
+//! there is a libc in the process, these functions may have surprising
+//! interactions with it.
+//!
+//! These functions are for implementing thread-local storage (TLS), managing
+//! threads, loaded libraries, and other process-wide resources. Most of
+//! `rustix` doesn't care about what other libraries are linked into the
+//! program or what they're doing, but the features in this module generally
+//! can only be used by one entity within a process.
+//!
+//! The API for these functions is not stable, and this module is
+//! `doc(hidden)`.
+//!
+//! [Origin]: https://github.com/sunfishcode/origin#readme
+//!
+//! # Safety
+//!
+//! This module is intended to be used for implementing a runtime library such
+//! as libc. Use of these features for any other purpose is likely to create
+//! serious problems.
+#![allow(unsafe_code)]
+
+use crate::backend;
+#[cfg(linux_raw)]
+use crate::ffi::CStr;
+#[cfg(linux_raw)]
+#[cfg(feature = "fs")]
+use crate::fs::AtFlags;
+#[cfg(linux_raw)]
+use crate::io;
+#[cfg(linux_raw)]
+use crate::pid::Pid;
+#[cfg(linux_raw)]
+#[cfg(feature = "fs")]
+use backend::fd::AsFd;
+#[cfg(linux_raw)]
+use core::ffi::c_void;
+
+#[cfg(linux_raw)]
+pub use crate::signal::Signal;
+
+/// `sigaction`
+#[cfg(linux_raw)]
+pub type Sigaction = linux_raw_sys::general::kernel_sigaction;
+
+/// `stack_t`
+#[cfg(linux_raw)]
+pub type Stack = linux_raw_sys::general::stack_t;
+
+/// `sigset_t`
+#[cfg(linux_raw)]
+pub type Sigset = linux_raw_sys::general::kernel_sigset_t;
+
+/// `siginfo_t`
+#[cfg(linux_raw)]
+pub type Siginfo = linux_raw_sys::general::siginfo_t;
+
+pub use crate::timespec::{Nsecs, Secs, Timespec};
+
+/// `SIG_*` constants for use with [`sigprocmask`].
+#[cfg(linux_raw)]
+#[repr(u32)]
+pub enum How {
+    /// `SIG_BLOCK`
+    BLOCK = linux_raw_sys::general::SIG_BLOCK,
+
+    /// `SIG_UNBLOCK`
+    UNBLOCK = linux_raw_sys::general::SIG_UNBLOCK,
+
+    /// `SIG_SETMASK`
+    SETMASK = linux_raw_sys::general::SIG_SETMASK,
+}
+
+#[cfg(target_arch = "x86")]
+#[inline]
+pub unsafe fn set_thread_area(u_info: &mut UserDesc) -> io::Result<()> {
+    backend::runtime::syscalls::tls::set_thread_area(u_info)
+}
+
+#[cfg(target_arch = "arm")]
+#[inline]
+pub unsafe fn arm_set_tls(data: *mut c_void) -> io::Result<()> {
+    backend::runtime::syscalls::tls::arm_set_tls(data)
+}
+
+/// `prctl(PR_SET_FS, data)`—Set the x86-64 `fs` register.
+///
+/// # Safety
+///
+/// This is a very low-level feature for implementing threading libraries.
+/// See the references links above.
+#[cfg(target_arch = "x86_64")]
+#[inline]
+pub unsafe fn set_fs(data: *mut c_void) {
+    backend::runtime::syscalls::tls::set_fs(data)
+}
+
+/// Set the x86-64 thread ID address.
+///
+/// # Safety
+///
+/// This is a very low-level feature for implementing threading libraries.
+/// See the references links above.
+#[inline]
+pub unsafe fn set_tid_address(data: *mut c_void) -> Pid {
+    backend::runtime::syscalls::tls::set_tid_address(data)
+}
+
+#[cfg(linux_raw)]
+#[cfg(target_arch = "x86")]
+pub use backend::runtime::tls::UserDesc;
+
+/// `syscall(SYS_exit, status)`—Exit the current thread.
+///
+/// # Safety
+///
+/// This is a very low-level feature for implementing threading libraries.
+#[inline]
+pub unsafe fn exit_thread(status: i32) -> ! {
+    backend::runtime::syscalls::tls::exit_thread(status)
+}
+
+/// Exit all the threads in the current process' thread group.
+///
+/// This is equivalent to `_exit` and `_Exit` in libc.
+///
+/// This does not call any `__cxa_atexit`, `atexit`, or any other destructors.
+/// Most programs should use [`std::process::exit`] instead of calling this
+/// directly.
+///
+/// # References
+///  - [POSIX `_Exit`]
+///  - [Linux `exit_group`]
+///  - [Linux `_Exit`]
+///
+/// [POSIX `_Exit`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/_Exit.html
+/// [Linux `exit_group`]: https://man7.org/linux/man-pages/man2/exit_group.2.html
+/// [Linux `_Exit`]: https://man7.org/linux/man-pages/man2/_Exit.2.html
+#[doc(alias = "_exit")]
+#[doc(alias = "_Exit")]
+#[inline]
+pub fn exit_group(status: i32) -> ! {
+    backend::runtime::syscalls::exit_group(status)
+}
+
+/// `EXIT_SUCCESS` for use with [`exit_group`].
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stdlib.h.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/exit.3.html
+pub const EXIT_SUCCESS: i32 = backend::c::EXIT_SUCCESS;
+
+/// `EXIT_FAILURE` for use with [`exit_group`].
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stdlib.h.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/exit.3.html
+pub const EXIT_FAILURE: i32 = backend::c::EXIT_FAILURE;
+
+/// Return fields from the main executable segment headers ("phdrs") relevant
+/// to initializing TLS provided to the program at startup.
+///
+/// `addr` will always be non-null, even when the TLS data is absent, so that
+/// the `addr` and `file_size` parameters are suitable for creating a slice
+/// with `slice::from_raw_parts`.
+#[inline]
+pub fn startup_tls_info() -> StartupTlsInfo {
+    backend::runtime::tls::startup_tls_info()
+}
+
+/// `(getauxval(AT_PHDR), getauxval(AT_PHENT), getauxval(AT_PHNUM))`—Returns
+/// the address, ELF segment header size, and number of ELF segment headers for
+/// the main executable.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man3/getauxval.3.html
+#[inline]
+pub fn exe_phdrs() -> (*const c_void, usize, usize) {
+    backend::param::auxv::exe_phdrs()
+}
+
+/// `getauxval(AT_ENTRY)`—Returns the address of the program entrypoint.
+///
+/// Most code interested in the program entrypoint address should instead use a
+/// symbol reference to `_start`. That will be properly PC-relative or
+/// relocated if needed, and will come with appropriate pointer type and
+/// pointer provenance.
+///
+/// This function is intended only for use in code that implements those
+/// relocations, to compute the ASLR offset. It has type `usize`, so it doesn't
+/// carry any provenance, and it shouldn't be used to dereference memory.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man3/getauxval.3.html
+#[inline]
+pub fn entry() -> usize {
+    backend::param::auxv::entry()
+}
+
+/// `getauxval(AT_RANDOM)`—Returns the address of 16 pseudorandom bytes.
+///
+/// These bytes are for use by libc. For anything else, use the `rand` crate.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man3/getauxval.3.html
+#[inline]
+pub fn random() -> *const [u8; 16] {
+    backend::param::auxv::random()
+}
+
+#[cfg(linux_raw)]
+pub use backend::runtime::tls::StartupTlsInfo;
+
+/// `fork()`—Creates a new process by duplicating the calling process.
+///
+/// On success, the pid of the child process is returned in the parent, and
+/// `None` is returned in the child.
+///
+/// Unlike its POSIX and libc counterparts, this `fork` does not invoke any
+/// handlers (such as those registered with `pthread_atfork`).
+///
+/// The program environment in the child after a `fork` and before an `execve`
+/// is very special. All code that executes in this environment must avoid:
+///
+///  - Acquiring any other locks that are held in other threads on the parent
+///    at the time of the `fork`, as the child only contains one thread, and
+///    attempting to acquire such locks will deadlock (though this is [not
+///    considered unsafe]).
+///
+///  - Performing any dynamic allocation using the global allocator, since
+///    global allocators may use locks to ensure thread safety, and their locks
+///    may not be released in the child process, so attempts to allocate may
+///    deadlock (as described in the previous point).
+///
+///  - Accessing any external state which the parent assumes it has exclusive
+///    access to, such as a file protected by a file lock, as this could
+///    corrupt the external state.
+///
+///  - Accessing any random-number-generator state inherited from the parent,
+///    as the parent may have the same state and generate the same random
+///    numbers, which may violate security invariants.
+///
+///  - Accessing any thread runtime state, since this function does not update
+///    the thread id in the thread runtime, so thread runtime functions could
+///    cause undefined behavior.
+///
+///  - Accessing any memory shared with the parent, such as a [`MAP_SHARED`]
+///    mapping, even with anonymous or [`memfd_create`] mappings, as this could
+///    cause undefined behavior.
+///
+///  - Calling any C function which isn't known to be [async-signal-safe], as
+///    that could cause undefined behavior. The extent to which this also
+///    applies to Rust functions is unclear at this time.
+///
+///  - And more.
+///
+/// # Safety
+///
+/// The child must avoid accessing any memory shared with the parent in a
+/// way that invokes undefined behavior. It must avoid accessing any threading
+/// runtime functions in a way that invokes undefined behavior. And it must
+/// avoid invoking any undefined behavior through any function that is not
+/// guaranteed to be async-signal-safe. But, what does async-signal-safe even
+/// mean in a Rust program? This documentation does not have all the answers.
+///
+/// So you're on your own. And on top of all the troubles with `fork` in
+/// general, this wrapper implementation is highly experimental.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// # Literary interlude
+///
+/// > Do not jump on ancient uncles.
+/// > Do not yell at average mice.
+/// > Do not wear a broom to breakfast.
+/// > Do not ask a snake’s advice.
+/// > Do not bathe in chocolate pudding.
+/// > Do not talk to bearded bears.
+/// > Do not smoke cigars on sofas.
+/// > Do not dance on velvet chairs.
+/// > Do not take a whale to visit
+/// > Russell’s mother’s cousin’s yacht.
+/// > And whatever else you do do
+/// > It is better you
+/// > Do not.
+///
+/// - “Rules”, by Karla Kuskin
+///
+/// [`MAP_SHARED`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/mmap.html
+/// [not considered unsafe]: https://doc.rust-lang.org/reference/behavior-not-considered-unsafe.html#deadlocks
+/// [`memfd_create`]: https://man7.org/linux/man-pages/man2/memfd_create.2.html
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fork.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fork.2.html
+/// [async-signal-safe]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_04_03
+pub unsafe fn fork() -> io::Result<Fork> {
+    backend::runtime::syscalls::fork()
+}
+
+/// Regular Unix `fork` doesn't tell the child its own PID because it assumes
+/// the child can just do `getpid`. That's true, but it's more fun if it
+/// doesn't have to.
+pub enum Fork {
+    Child(Pid),
+    Parent(Pid),
+}
+
+/// `execveat(dirfd, path.as_c_str(), argv, envp, flags)`—Execute a new
+/// command using the current process.
+///
+/// # Safety
+///
+/// The `argv` and `envp` pointers must point to NUL-terminated arrays, and
+/// their contents must be pointers to NUL-terminated byte arrays.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/execveat.2.html
+#[inline]
+#[cfg(feature = "fs")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "fs")))]
+pub unsafe fn execveat<Fd: AsFd>(
+    dirfd: Fd,
+    path: &CStr,
+    argv: *const *const u8,
+    envp: *const *const u8,
+    flags: AtFlags,
+) -> io::Errno {
+    backend::runtime::syscalls::execveat(dirfd.as_fd(), path, argv, envp, flags)
+}
+
+/// `execve(path.as_c_str(), argv, envp)`—Execute a new command using the
+/// current process.
+///
+/// # Safety
+///
+/// The `argv` and `envp` pointers must point to NUL-terminated arrays, and
+/// their contents must be pointers to NUL-terminated byte arrays.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/execve.2.html
+#[inline]
+pub unsafe fn execve(path: &CStr, argv: *const *const u8, envp: *const *const u8) -> io::Errno {
+    backend::runtime::syscalls::execve(path, argv, envp)
+}
+
+/// `sigaction(signal, &new, &old)`—Modify or query a signal handler.
+///
+/// # Safety
+///
+/// You're on your own. And on top of all the troubles with signal handlers,
+/// this implementation is highly experimental. Even further, it differs from
+/// the libc `sigaction` in several non-obvious and unsafe ways.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigaction.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/sigaction.2.html
+#[inline]
+pub unsafe fn sigaction(signal: Signal, new: Option<Sigaction>) -> io::Result<Sigaction> {
+    backend::runtime::syscalls::sigaction(signal, new)
+}
+
+/// `sigaltstack(new, old)`—Modify or query a signal stack.
+///
+/// # Safety
+///
+/// You're on your own. And on top of all the troubles with signal handlers,
+/// this implementation is highly experimental.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigaltstack.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/sigaltstack.2.html
+#[inline]
+pub unsafe fn sigaltstack(new: Option<Stack>) -> io::Result<Stack> {
+    backend::runtime::syscalls::sigaltstack(new)
+}
+
+/// `tkill(tid, sig)`—Send a signal to a thread.
+///
+/// # Safety
+///
+/// You're on your own. And on top of all the troubles with signal handlers,
+/// this implementation is highly experimental. The warning about the hazard
+/// of recycled thread ID's applies.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/tkill.2.html
+#[inline]
+pub unsafe fn tkill(tid: Pid, sig: Signal) -> io::Result<()> {
+    backend::runtime::syscalls::tkill(tid, sig)
+}
+
+/// `sigprocmask(how, set, oldset)`—Adjust the process signal mask.
+///
+/// # Safety
+///
+/// You're on your own. And on top of all the troubles with signal handlers,
+/// this implementation is highly experimental. Even further, it differs from
+/// the libc `sigprocmask` in several non-obvious and unsafe ways.
+///
+/// # References
+///  - [Linux `sigprocmask`]
+///  - [Linux `pthread_sigmask`]
+///
+/// [Linux `sigprocmask`]: https://man7.org/linux/man-pages/man2/sigprocmask.2.html
+/// [Linux `pthread_sigmask`]: https://man7.org/linux/man-pages/man3/pthread_sigmask.3.html
+#[inline]
+#[doc(alias = "pthread_sigmask")]
+pub unsafe fn sigprocmask(how: How, set: Option<&Sigset>) -> io::Result<Sigset> {
+    backend::runtime::syscalls::sigprocmask(how, set)
+}
+
+/// `sigpending()`—Query the pending signals.
+///
+/// # References
+///  - [Linux `sigpending`]
+///
+/// [Linux `sigpending`]: https://man7.org/linux/man-pages/man2/sigpending.2.html
+#[inline]
+pub fn sigpending() -> Sigset {
+    backend::runtime::syscalls::sigpending()
+}
+
+/// `sigsuspend(set)`—Suspend the calling thread and wait for signals.
+///
+/// # References
+///  - [Linux `sigsuspend`]
+///
+/// [Linux `sigsuspend`]: https://man7.org/linux/man-pages/man2/sigsuspend.2.html
+#[inline]
+pub fn sigsuspend(set: &Sigset) -> io::Result<()> {
+    backend::runtime::syscalls::sigsuspend(set)
+}
+
+/// `sigwait(set)`—Wait for signals.
+///
+/// # Safety
+///
+/// If code elsewhere in the process is depending on delivery of a signal to
+/// prevent it from executing some code, this could cause it to miss that
+/// signal and execute that code.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man3/sigwait.3.html
+#[inline]
+pub unsafe fn sigwait(set: &Sigset) -> io::Result<Signal> {
+    backend::runtime::syscalls::sigwait(set)
+}
+
+/// `sigwaitinfo(set)`—Wait for signals, returning a [`Siginfo`].
+///
+/// # Safety
+///
+/// If code elsewhere in the process is depending on delivery of a signal to
+/// prevent it from executing some code, this could cause it to miss that
+/// signal and execute that code.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/sigwaitinfo.2.html
+#[inline]
+pub unsafe fn sigwaitinfo(set: &Sigset) -> io::Result<Siginfo> {
+    backend::runtime::syscalls::sigwaitinfo(set)
+}
+
+/// `sigtimedwait(set)`—Wait for signals, optionally with a timeout.
+///
+/// # Safety
+///
+/// If code elsewhere in the process is depending on delivery of a signal to
+/// prevent it from executing some code, this could cause it to miss that
+/// signal and execute that code.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/sigtimedwait.2.html
+#[inline]
+pub unsafe fn sigtimedwait(set: &Sigset, timeout: Option<Timespec>) -> io::Result<Siginfo> {
+    backend::runtime::syscalls::sigtimedwait(set, timeout)
+}
+
+/// `getauxval(AT_SECURE)`—Returns the Linux “secure execution” mode.
+///
+/// Return a boolean value indicating whether “secure execution” mode was
+/// requested, due to the process having elevated privileges. This includes
+/// whether the `AT_SECURE` AUX value is set, and whether the initial real UID
+/// and GID differ from the initial effective UID and GID.
+///
+/// The meaning of “secure execution” mode is beyond the scope of this
+/// comment.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man3/getauxval.3.html
+#[cfg(any(
+    linux_raw,
+    any(
+        all(target_os = "android", target_pointer_width = "64"),
+        target_os = "linux",
+    )
+))]
+#[inline]
+pub fn linux_secure() -> bool {
+    backend::param::auxv::linux_secure()
+}
+
+/// `brk(addr)`—Change the location of the “program break”.
+///
+/// # Safety
+///
+/// This is not identical to `brk` in libc. libc `brk` may have bookkeeping
+/// that needs to be kept up to date that this doesn't keep up to date, so
+/// don't use it unless you are implementing libc.
+#[cfg(linux_raw)]
+#[inline]
+pub unsafe fn brk(addr: *mut c_void) -> io::Result<*mut c_void> {
+    backend::runtime::syscalls::brk(addr)
+}
+
+/// `__SIGRTMIN`—The start of the realtime signal range.
+///
+/// This is the raw `SIGRTMIN` value from the OS, which is not the same as the
+/// `SIGRTMIN` macro provided by libc. Don't use this unless you are
+/// implementing libc.
+#[cfg(linux_raw)]
+pub const SIGRTMIN: u32 = linux_raw_sys::general::SIGRTMIN;
+
+/// `__SIGRTMAX`—The last of the realtime signal range.
+///
+/// This is the raw `SIGRTMAX` value from the OS, which is not the same as the
+/// `SIGRTMAX` macro provided by libc. Don't use this unless you are
+/// implementing libc.
+#[cfg(linux_raw)]
+pub const SIGRTMAX: u32 = {
+    // Use the actual `SIGRTMAX` value on platforms which define it.
+    #[cfg(not(any(target_arch = "arm", target_arch = "x86", target_arch = "x86_64")))]
+    {
+        linux_raw_sys::general::SIGRTMAX
+    }
+
+    // On platfoms that don't, derive it from `_NSIG`.
+    #[cfg(any(target_arch = "arm", target_arch = "x86", target_arch = "x86_64"))]
+    {
+        linux_raw_sys::general::_NSIG - 1
+    }
+};
diff --git a/vendor/rustix/src/shm.rs b/vendor/rustix/src/shm.rs
new file mode 100644
index 0000000..450b6fc
--- /dev/null
+++ b/vendor/rustix/src/shm.rs
@@ -0,0 +1,40 @@
+//! POSIX shared memory
+
+use crate::fd::OwnedFd;
+use crate::{backend, io, path};
+
+pub use crate::backend::fs::types::Mode;
+pub use crate::backend::shm::types::ShmOFlags;
+
+/// `shm_open(name, oflags, mode)`—Opens a shared memory object.
+///
+/// For portability, `name` should begin with a slash, contain no other
+/// slashes, and be no longer than an implementation-defined limit (255 on
+/// Linux).
+///
+/// Exactly one of [`ShmOFlags::RDONLY`] and [`ShmOFlags::RDWR`] should be
+/// passed. The file descriptor will be opened with `FD_CLOEXEC` set.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/shm_open.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/shm_open.3.html
+#[inline]
+pub fn shm_open<P: path::Arg>(name: P, flags: ShmOFlags, mode: Mode) -> io::Result<OwnedFd> {
+    name.into_with_c_str(|name| backend::shm::syscalls::shm_open(name, flags, mode))
+}
+
+/// `shm_unlink(name)`—Unlinks a shared memory object.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/shm_unlink.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/shm_unlink.3.html
+#[inline]
+pub fn shm_unlink<P: path::Arg>(name: P) -> io::Result<()> {
+    name.into_with_c_str(backend::shm::syscalls::shm_unlink)
+}
diff --git a/vendor/rustix/src/signal.rs b/vendor/rustix/src/signal.rs
new file mode 100644
index 0000000..e55126f
--- /dev/null
+++ b/vendor/rustix/src/signal.rs
@@ -0,0 +1,250 @@
+use crate::backend::c;
+
+/// A signal number for use with [`kill_process`], [`kill_process_group`],
+/// and [`kill_current_process_group`].
+///
+/// [`kill_process`]: crate::process::kill_process
+/// [`kill_process_group`]: crate::process::kill_process_group
+/// [`kill_current_process_group`]: crate::process::kill_current_process_group
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(i32)]
+pub enum Signal {
+    /// `SIGHUP`
+    Hup = c::SIGHUP,
+    /// `SIGINT`
+    Int = c::SIGINT,
+    /// `SIGQUIT`
+    Quit = c::SIGQUIT,
+    /// `SIGILL`
+    Ill = c::SIGILL,
+    /// `SIGTRAP`
+    Trap = c::SIGTRAP,
+    /// `SIGABRT`, aka `SIGIOT`
+    #[doc(alias = "Iot")]
+    #[doc(alias = "Abrt")]
+    Abort = c::SIGABRT,
+    /// `SIGBUS`
+    Bus = c::SIGBUS,
+    /// `SIGFPE`
+    Fpe = c::SIGFPE,
+    /// `SIGKILL`
+    Kill = c::SIGKILL,
+    /// `SIGUSR1`
+    #[cfg(not(target_os = "vita"))]
+    Usr1 = c::SIGUSR1,
+    /// `SIGSEGV`
+    Segv = c::SIGSEGV,
+    /// `SIGUSR2`
+    #[cfg(not(target_os = "vita"))]
+    Usr2 = c::SIGUSR2,
+    /// `SIGPIPE`
+    Pipe = c::SIGPIPE,
+    /// `SIGALRM`
+    #[doc(alias = "Alrm")]
+    Alarm = c::SIGALRM,
+    /// `SIGTERM`
+    Term = c::SIGTERM,
+    /// `SIGSTKFLT`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        target_os = "aix",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita",
+        all(
+            linux_kernel,
+            any(
+                target_arch = "mips",
+                target_arch = "mips32r6",
+                target_arch = "mips64",
+                target_arch = "mips64r6",
+                target_arch = "sparc",
+                target_arch = "sparc64"
+            ),
+        )
+    )))]
+    Stkflt = c::SIGSTKFLT,
+    /// `SIGCHLD`
+    #[cfg(not(target_os = "vita"))]
+    #[doc(alias = "Chld")]
+    Child = c::SIGCHLD,
+    /// `SIGCONT`
+    #[cfg(not(target_os = "vita"))]
+    Cont = c::SIGCONT,
+    /// `SIGSTOP`
+    #[cfg(not(target_os = "vita"))]
+    Stop = c::SIGSTOP,
+    /// `SIGTSTP`
+    #[cfg(not(target_os = "vita"))]
+    Tstp = c::SIGTSTP,
+    /// `SIGTTIN`
+    #[cfg(not(target_os = "vita"))]
+    Ttin = c::SIGTTIN,
+    /// `SIGTTOU`
+    #[cfg(not(target_os = "vita"))]
+    Ttou = c::SIGTTOU,
+    /// `SIGURG`
+    #[cfg(not(target_os = "vita"))]
+    Urg = c::SIGURG,
+    /// `SIGXCPU`
+    #[cfg(not(target_os = "vita"))]
+    Xcpu = c::SIGXCPU,
+    /// `SIGXFSZ`
+    #[cfg(not(target_os = "vita"))]
+    Xfsz = c::SIGXFSZ,
+    /// `SIGVTALRM`
+    #[cfg(not(target_os = "vita"))]
+    #[doc(alias = "Vtalrm")]
+    Vtalarm = c::SIGVTALRM,
+    /// `SIGPROF`
+    #[cfg(not(target_os = "vita"))]
+    Prof = c::SIGPROF,
+    /// `SIGWINCH`
+    #[cfg(not(target_os = "vita"))]
+    Winch = c::SIGWINCH,
+    /// `SIGIO`, aka `SIGPOLL`
+    #[doc(alias = "Poll")]
+    #[cfg(not(any(target_os = "haiku", target_os = "vita")))]
+    Io = c::SIGIO,
+    /// `SIGPWR`
+    #[cfg(not(any(bsd, target_os = "haiku", target_os = "vita")))]
+    #[doc(alias = "Pwr")]
+    Power = c::SIGPWR,
+    /// `SIGSYS`, aka `SIGUNUSED`
+    #[doc(alias = "Unused")]
+    Sys = c::SIGSYS,
+    /// `SIGEMT`
+    #[cfg(any(
+        bsd,
+        solarish,
+        target_os = "aix",
+        target_os = "hermit",
+        all(
+            linux_kernel,
+            any(
+                target_arch = "mips",
+                target_arch = "mips32r6",
+                target_arch = "mips64",
+                target_arch = "mips64r6",
+                target_arch = "sparc",
+                target_arch = "sparc64"
+            )
+        )
+    ))]
+    Emt = c::SIGEMT,
+    /// `SIGINFO`
+    #[cfg(bsd)]
+    Info = c::SIGINFO,
+    /// `SIGTHR`
+    #[cfg(target_os = "freebsd")]
+    #[doc(alias = "Lwp")]
+    Thr = c::SIGTHR,
+    /// `SIGLIBRT`
+    #[cfg(target_os = "freebsd")]
+    Librt = c::SIGLIBRT,
+}
+
+impl Signal {
+    /// Convert a raw signal number into a `Signal`, if possible.
+    pub fn from_raw(sig: c::c_int) -> Option<Self> {
+        match sig {
+            c::SIGHUP => Some(Self::Hup),
+            c::SIGINT => Some(Self::Int),
+            c::SIGQUIT => Some(Self::Quit),
+            c::SIGILL => Some(Self::Ill),
+            c::SIGTRAP => Some(Self::Trap),
+            c::SIGABRT => Some(Self::Abort),
+            c::SIGBUS => Some(Self::Bus),
+            c::SIGFPE => Some(Self::Fpe),
+            c::SIGKILL => Some(Self::Kill),
+            #[cfg(not(target_os = "vita"))]
+            c::SIGUSR1 => Some(Self::Usr1),
+            c::SIGSEGV => Some(Self::Segv),
+            #[cfg(not(target_os = "vita"))]
+            c::SIGUSR2 => Some(Self::Usr2),
+            c::SIGPIPE => Some(Self::Pipe),
+            c::SIGALRM => Some(Self::Alarm),
+            c::SIGTERM => Some(Self::Term),
+            #[cfg(not(any(
+                bsd,
+                solarish,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "vita",
+                all(
+                    linux_kernel,
+                    any(
+                        target_arch = "mips",
+                        target_arch = "mips32r6",
+                        target_arch = "mips64",
+                        target_arch = "mips64r6",
+                        target_arch = "sparc",
+                        target_arch = "sparc64"
+                    ),
+                )
+            )))]
+            c::SIGSTKFLT => Some(Self::Stkflt),
+            #[cfg(not(target_os = "vita"))]
+            c::SIGCHLD => Some(Self::Child),
+            #[cfg(not(target_os = "vita"))]
+            c::SIGCONT => Some(Self::Cont),
+            #[cfg(not(target_os = "vita"))]
+            c::SIGSTOP => Some(Self::Stop),
+            #[cfg(not(target_os = "vita"))]
+            c::SIGTSTP => Some(Self::Tstp),
+            #[cfg(not(target_os = "vita"))]
+            c::SIGTTIN => Some(Self::Ttin),
+            #[cfg(not(target_os = "vita"))]
+            c::SIGTTOU => Some(Self::Ttou),
+            #[cfg(not(target_os = "vita"))]
+            c::SIGURG => Some(Self::Urg),
+            #[cfg(not(target_os = "vita"))]
+            c::SIGXCPU => Some(Self::Xcpu),
+            #[cfg(not(target_os = "vita"))]
+            c::SIGXFSZ => Some(Self::Xfsz),
+            #[cfg(not(target_os = "vita"))]
+            c::SIGVTALRM => Some(Self::Vtalarm),
+            #[cfg(not(target_os = "vita"))]
+            c::SIGPROF => Some(Self::Prof),
+            #[cfg(not(target_os = "vita"))]
+            c::SIGWINCH => Some(Self::Winch),
+            #[cfg(not(any(target_os = "haiku", target_os = "vita")))]
+            c::SIGIO => Some(Self::Io),
+            #[cfg(not(any(bsd, target_os = "haiku", target_os = "vita")))]
+            c::SIGPWR => Some(Self::Power),
+            c::SIGSYS => Some(Self::Sys),
+            #[cfg(any(
+                bsd,
+                solarish,
+                target_os = "aix",
+                target_os = "hermit",
+                all(
+                    linux_kernel,
+                    any(
+                        target_arch = "mips",
+                        target_arch = "mips32r6",
+                        target_arch = "mips64",
+                        target_arch = "mips64r6",
+                        target_arch = "sparc",
+                        target_arch = "sparc64"
+                    )
+                )
+            ))]
+            c::SIGEMT => Some(Self::Emt),
+            #[cfg(bsd)]
+            c::SIGINFO => Some(Self::Info),
+            #[cfg(target_os = "freebsd")]
+            c::SIGTHR => Some(Self::Thr),
+            #[cfg(target_os = "freebsd")]
+            c::SIGLIBRT => Some(Self::Librt),
+            _ => None,
+        }
+    }
+}
+
+#[test]
+fn test_sizes() {
+    assert_eq_size!(Signal, c::c_int);
+}
diff --git a/vendor/rustix/src/static_assertions.rs b/vendor/rustix/src/static_assertions.rs
new file mode 100644
index 0000000..3d07118
--- /dev/null
+++ b/vendor/rustix/src/static_assertions.rs
@@ -0,0 +1,36 @@
+//! Workarounds for Rust 1.63 where some things in the `static_assertions`
+//! crate do things that don't work in const contexts. We want to call them in
+//! const contexts in Rust versions where that's supported so that problems are
+//! caught at compile time, and fall back to dynamic asserts in Rust 1.63.
+
+#![allow(unused_macros)]
+
+macro_rules! assert_eq_size {
+    ($x:ty, $y:ty) => {
+        assert_eq!(core::mem::size_of::<$x>(), core::mem::size_of::<$y>());
+    };
+}
+
+macro_rules! assert_eq_align {
+    ($x:ty, $y:ty) => {
+        assert_eq!(core::mem::align_of::<$x>(), core::mem::align_of::<$y>());
+    };
+}
+
+macro_rules! const_assert_eq {
+    ($x:expr, $y:expr) => {
+        assert_eq!($x, $y);
+    };
+}
+
+macro_rules! const_assert_ne {
+    ($x:expr, $y:expr) => {
+        assert_ne!($x, $y);
+    };
+}
+
+macro_rules! const_assert {
+    ($x:expr) => {
+        assert!($x);
+    };
+}
diff --git a/vendor/rustix/src/stdio.rs b/vendor/rustix/src/stdio.rs
new file mode 100644
index 0000000..278aba0
--- /dev/null
+++ b/vendor/rustix/src/stdio.rs
@@ -0,0 +1,511 @@
+//! Functions returning the stdio file descriptors.
+//!
+//! # Safety
+//!
+//! These access the file descriptors by absolute index value, and nothing
+//! prevents them from being closed and reused. They should only be used in
+//! `main` or other situations where one is in control of the process'
+//! stdio streams.
+#![allow(unsafe_code)]
+
+use crate::backend;
+use crate::fd::OwnedFd;
+use backend::c;
+use backend::fd::{BorrowedFd, FromRawFd, RawFd};
+
+#[cfg(not(any(windows, target_os = "wasi")))]
+use {crate::io, backend::fd::AsFd, core::mem::forget};
+
+/// `STDIN_FILENO`—Standard input, borrowed.
+///
+/// In `std`-using configurations, this is a safe function, because the
+/// standard library already assumes that the stdin file descriptor is always
+/// valid. In `no_std` configurations, it is `unsafe`.
+///
+/// # Warning
+///
+/// This function allows reading directly from stdin without coordinating
+/// with the buffering performed by [`std::io::Stdin`], so it could cause
+/// corrupted input.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdin.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/stdin.3.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdin&sektion=4
+/// [NetBSD]: https://man.netbsd.org/stdin.4
+/// [OpenBSD]: https://man.openbsd.org/stdin.4
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdin&section=4
+/// [illumos]: https://illumos.org/man/4FS/stdin
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdin
+#[cfg(feature = "std")]
+#[doc(alias = "STDIN_FILENO")]
+#[inline]
+pub const fn stdin() -> BorrowedFd<'static> {
+    // SAFETY: When "std" is enabled, the standard library assumes that the
+    // stdio file descriptors are all valid.
+    unsafe { BorrowedFd::borrow_raw(c::STDIN_FILENO as RawFd) }
+}
+
+/// `STDIN_FILENO`—Standard input, borrowed.
+///
+/// In `std`-using configurations, this is a safe function, because the
+/// standard library already assumes that the stdin file descriptor is always
+/// valid. In `no_std` configurations, it is `unsafe`.
+///
+/// # Safety
+///
+/// In `no_std` configurations, the stdin file descriptor can be closed,
+/// potentially on other threads, in which case the file descriptor index
+/// value could be dynamically reused for other purposes, potentially on
+/// different threads.
+///
+/// # Warning
+///
+/// This function allows reading directly from stdin without coordinating
+/// with the buffering performed by [`std::io::Stdin`], so it could cause
+/// corrupted input.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdin.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/stdin.3.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdin&sektion=4
+/// [NetBSD]: https://man.netbsd.org/stdin.4
+/// [OpenBSD]: https://man.openbsd.org/stdin.4
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdin&section=4
+/// [illumos]: https://illumos.org/man/4FS/stdin
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdin
+#[cfg(not(feature = "std"))]
+#[doc(alias = "STDIN_FILENO")]
+#[inline]
+pub const unsafe fn stdin() -> BorrowedFd<'static> {
+    BorrowedFd::borrow_raw(c::STDIN_FILENO as RawFd)
+}
+
+/// `STDIN_FILENO`—Standard input, owned.
+///
+/// This is similar to [`stdin`], however it returns an `OwnedFd` which closes
+/// standard input when it is dropped.
+///
+/// # Safety
+///
+/// Safe `std`-using Rust code is permitted to assume that the stdin file
+/// descriptor is always valid. This function returns an `OwnedFd` which will
+/// close the stdin file descriptor when dropped.
+///
+/// # Warning
+///
+/// This has the same hazards as [`stdin`].
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdin.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/stdin.3.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdin&sektion=4
+/// [NetBSD]: https://man.netbsd.org/stdin.4
+/// [OpenBSD]: https://man.openbsd.org/stdin.4
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdin&section=4
+/// [illumos]: https://illumos.org/man/4FS/stdin
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdin
+#[doc(alias = "STDIN_FILENO")]
+#[inline]
+pub unsafe fn take_stdin() -> OwnedFd {
+    backend::fd::OwnedFd::from_raw_fd(c::STDIN_FILENO as RawFd)
+}
+
+/// `STDOUT_FILENO`—Standard output, borrowed.
+///
+/// In `std`-using configurations, this is a safe function, because the
+/// standard library already assumes that the stdout file descriptor is always
+/// valid. In `no_std` configurations, it is `unsafe`.
+///
+/// # Warning
+///
+/// This function allows reading directly from stdout without coordinating
+/// with the buffering performed by [`std::io::Stdout`], so it could cause
+/// corrupted input.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdout.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/stdout.3.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdout&sektion=4
+/// [NetBSD]: https://man.netbsd.org/stdout.4
+/// [OpenBSD]: https://man.openbsd.org/stdout.4
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdout&section=4
+/// [illumos]: https://illumos.org/man/4FS/stdout
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdout
+#[cfg(feature = "std")]
+#[doc(alias = "STDOUT_FILENO")]
+#[inline]
+pub const fn stdout() -> BorrowedFd<'static> {
+    // SAFETY: When "std" is enabled, the standard library assumes that the
+    // stdio file descriptors are all valid.
+    unsafe { BorrowedFd::borrow_raw(c::STDOUT_FILENO as RawFd) }
+}
+
+/// `STDOUT_FILENO`—Standard output, borrowed.
+///
+/// In `std`-using configurations, this is a safe function, because the
+/// standard library already assumes that the stdout file descriptor is always
+/// valid. In `no_std` configurations, it is `unsafe`.
+///
+/// # Safety
+///
+/// In `no_std` configurations, the stdout file descriptor can be closed,
+/// potentially on other threads, in which case the file descriptor index
+/// value could be dynamically reused for other purposes, potentially on
+/// different threads.
+///
+/// # Warning
+///
+/// This function allows reading directly from stdout without coordinating
+/// with the buffering performed by [`std::io::Stdout`], so it could cause
+/// corrupted input.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdout.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/stdout.3.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdout&sektion=4
+/// [NetBSD]: https://man.netbsd.org/stdout.4
+/// [OpenBSD]: https://man.openbsd.org/stdout.4
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdout&section=4
+/// [illumos]: https://illumos.org/man/4FS/stdout
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdout
+#[cfg(not(feature = "std"))]
+#[doc(alias = "STDOUT_FILENO")]
+#[inline]
+pub const unsafe fn stdout() -> BorrowedFd<'static> {
+    BorrowedFd::borrow_raw(c::STDOUT_FILENO as RawFd)
+}
+
+/// `STDOUT_FILENO`—Standard output, owned.
+///
+/// This is similar to [`stdout`], however it returns an `OwnedFd` which closes
+/// standard output when it is dropped.
+///
+/// # Safety
+///
+/// Safe `std`-using Rust code is permitted to assume that the stdout file
+/// descriptor is always valid. This function returns an `OwnedFd` which will
+/// close the stdout file descriptor when dropped.
+///
+/// # Warning
+///
+/// This has the same hazards as [`stdout`].
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdout.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/stdout.3.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdout&sektion=4
+/// [NetBSD]: https://man.netbsd.org/stdout.4
+/// [OpenBSD]: https://man.openbsd.org/stdout.4
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdout&section=4
+/// [illumos]: https://illumos.org/man/4FS/stdout
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdout
+#[doc(alias = "STDOUT_FILENO")]
+#[inline]
+pub unsafe fn take_stdout() -> OwnedFd {
+    backend::fd::OwnedFd::from_raw_fd(c::STDOUT_FILENO as RawFd)
+}
+
+/// `STDERR_FILENO`—Standard error, borrowed.
+///
+/// In `std`-using configurations, this is a safe function, because the
+/// standard library already assumes that the stderr file descriptor is always
+/// valid. In `no_std` configurations, it is `unsafe`.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stderr.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/stderr.3.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stderr&sektion=4
+/// [NetBSD]: https://man.netbsd.org/stderr.4
+/// [OpenBSD]: https://man.openbsd.org/stderr.4
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stderr&section=4
+/// [illumos]: https://illumos.org/man/4FS/stderr
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stderr
+#[cfg(feature = "std")]
+#[doc(alias = "STDERR_FILENO")]
+#[inline]
+pub const fn stderr() -> BorrowedFd<'static> {
+    // SAFETY: When "std" is enabled, the standard library assumes that the
+    // stdio file descriptors are all valid.
+    unsafe { BorrowedFd::borrow_raw(c::STDERR_FILENO as RawFd) }
+}
+
+/// `STDERR_FILENO`—Standard error, borrowed.
+///
+/// In `std`-using configurations, this is a safe function, because the
+/// standard library already assumes that the stderr file descriptor is always
+/// valid. In `no_std` configurations, it is `unsafe`.
+///
+/// # Safety
+///
+/// In `no_std` configurations, the stderr file descriptor can be closed,
+/// potentially on other threads, in which case the file descriptor index
+/// value could be dynamically reused for other purposes, potentially on
+/// different threads.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stderr.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/stderr.3.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stderr&sektion=4
+/// [NetBSD]: https://man.netbsd.org/stderr.4
+/// [OpenBSD]: https://man.openbsd.org/stderr.4
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stderr&section=4
+/// [illumos]: https://illumos.org/man/4FS/stderr
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stderr
+#[cfg(not(feature = "std"))]
+#[doc(alias = "STDERR_FILENO")]
+#[inline]
+pub const unsafe fn stderr() -> BorrowedFd<'static> {
+    BorrowedFd::borrow_raw(c::STDERR_FILENO as RawFd)
+}
+
+/// `STDERR_FILENO`—Standard error, owned.
+///
+/// This is similar to [`stderr`], however it returns an `OwnedFd` which closes
+/// standard output when it is dropped.
+///
+/// # Safety
+///
+/// Safe std-using Rust code is permitted to assume that the stderr file
+/// descriptor is always valid. This function returns an `OwnedFd` which will
+/// close the stderr file descriptor when dropped.
+///
+/// # Other hazards
+///
+/// This has the same hazards as [`stderr`].
+///
+/// And, when the `OwnedFd` is dropped, subsequent newly created file
+/// descriptors may unknowingly reuse the stderr file descriptor number, which
+/// may break common assumptions, so it should typically only be dropped at the
+/// end of a program when no more file descriptors will be created.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stderr.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/stderr.3.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stderr&sektion=4
+/// [NetBSD]: https://man.netbsd.org/stderr.4
+/// [OpenBSD]: https://man.openbsd.org/stderr.4
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stderr&section=4
+/// [illumos]: https://illumos.org/man/4FS/stderr
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stderr
+#[doc(alias = "STDERR_FILENO")]
+#[inline]
+pub unsafe fn take_stderr() -> OwnedFd {
+    backend::fd::OwnedFd::from_raw_fd(c::STDERR_FILENO as RawFd)
+}
+
+/// `STDIN_FILENO`—Standard input, raw.
+///
+/// This is similar to [`stdin`], however it returns a `RawFd`.
+///
+/// # Other hazards
+///
+/// This has the same hazards as [`stdin`].
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdin.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/stdin.3.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdin&sektion=4
+/// [NetBSD]: https://man.netbsd.org/stdin.4
+/// [OpenBSD]: https://man.openbsd.org/stdin.4
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdin&section=4
+/// [illumos]: https://illumos.org/man/4FS/stdin
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdin
+#[doc(alias = "STDIN_FILENO")]
+#[inline]
+pub const fn raw_stdin() -> RawFd {
+    c::STDIN_FILENO as RawFd
+}
+
+/// `STDOUT_FILENO`—Standard output, raw.
+///
+/// This is similar to [`stdout`], however it returns a `RawFd`.
+///
+/// # Other hazards
+///
+/// This has the same hazards as [`stdout`].
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdout.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/stdout.3.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stdout&sektion=4
+/// [NetBSD]: https://man.netbsd.org/stdout.4
+/// [OpenBSD]: https://man.openbsd.org/stdout.4
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stdout&section=4
+/// [illumos]: https://illumos.org/man/4FS/stdout
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stdout
+#[doc(alias = "STDOUT_FILENO")]
+#[inline]
+pub const fn raw_stdout() -> RawFd {
+    c::STDOUT_FILENO as RawFd
+}
+
+/// `STDERR_FILENO`—Standard error, raw.
+///
+/// This is similar to [`stderr`], however it returns a `RawFd`.
+///
+/// # Other hazards
+///
+/// This has the same hazards as [`stderr`].
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stderr.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/stderr.3.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=stderr&sektion=4
+/// [NetBSD]: https://man.netbsd.org/stderr.4
+/// [OpenBSD]: https://man.openbsd.org/stderr.4
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=stderr&section=4
+/// [illumos]: https://illumos.org/man/4FS/stderr
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html#index-stderr
+#[doc(alias = "STDERR_FILENO")]
+#[inline]
+pub const fn raw_stderr() -> RawFd {
+    c::STDERR_FILENO as RawFd
+}
+
+/// Utility function to safely `dup2` over stdin (fd 0).
+#[cfg(not(any(windows, target_os = "wasi")))]
+#[allow(clippy::mem_forget)]
+#[inline]
+pub fn dup2_stdin<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    // SAFETY: We pass the returned `OwnedFd` to `forget` so that it isn't
+    // dropped.
+    let mut target = unsafe { take_stdin() };
+    backend::io::syscalls::dup2(fd.as_fd(), &mut target)?;
+    forget(target);
+    Ok(())
+}
+
+/// Utility function to safely `dup2` over stdout (fd 1).
+#[cfg(not(any(windows, target_os = "wasi")))]
+#[allow(clippy::mem_forget)]
+#[inline]
+pub fn dup2_stdout<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    // SAFETY: We pass the returned `OwnedFd` to `forget` so that it isn't
+    // dropped.
+    let mut target = unsafe { take_stdout() };
+    backend::io::syscalls::dup2(fd.as_fd(), &mut target)?;
+    forget(target);
+    Ok(())
+}
+
+/// Utility function to safely `dup2` over stderr (fd 2).
+#[cfg(not(any(windows, target_os = "wasi")))]
+#[allow(clippy::mem_forget)]
+#[inline]
+pub fn dup2_stderr<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    // SAFETY: We pass the returned `OwnedFd` to `forget` so that it isn't
+    // dropped.
+    let mut target = unsafe { take_stderr() };
+    backend::io::syscalls::dup2(fd.as_fd(), &mut target)?;
+    forget(target);
+    Ok(())
+}
diff --git a/vendor/rustix/src/system.rs b/vendor/rustix/src/system.rs
new file mode 100644
index 0000000..cebf29e
--- /dev/null
+++ b/vendor/rustix/src/system.rs
@@ -0,0 +1,220 @@
+//! Uname and other system-level functions.
+//!
+//! # Safety
+//!
+//! This function converts from `struct utsname` fields provided from the
+//! kernel into `&str` references, which assumes that they're NUL-terminated.
+#![allow(unsafe_code)]
+
+use crate::backend;
+#[cfg(target_os = "linux")]
+use crate::backend::c;
+use crate::ffi::CStr;
+#[cfg(not(any(target_os = "espidf", target_os = "emscripten", target_os = "vita")))]
+use crate::io;
+use core::fmt;
+
+#[cfg(linux_kernel)]
+pub use backend::system::types::Sysinfo;
+
+/// `uname()`—Returns high-level information about the runtime OS and
+/// hardware.
+///
+/// For `gethostname()`, use [`Uname::nodename`] on the result.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [NetBSD]
+///  - [FreeBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/uname.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/uname.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/uname.3.html
+/// [NetBSD]: https://man.netbsd.org/uname.3
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=uname&sektion=3
+/// [OpenBSD]: https://man.openbsd.org/uname.3
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=uname&section=3
+/// [illumos]: https://illumos.org/man/2/uname
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Platform-Type.html
+#[doc(alias = "gethostname")]
+#[inline]
+pub fn uname() -> Uname {
+    Uname(backend::system::syscalls::uname())
+}
+
+/// `struct utsname`—Return type for [`uname`].
+#[doc(alias = "utsname")]
+pub struct Uname(backend::system::types::RawUname);
+
+impl Uname {
+    /// `sysname`—Operating system release name
+    #[inline]
+    pub fn sysname(&self) -> &CStr {
+        Self::to_cstr(self.0.sysname.as_ptr().cast())
+    }
+
+    /// `nodename`—Name with vague meaning
+    ///
+    /// This is intended to be a network name, however it's unable to convey
+    /// information about hosts that have multiple names, or any information
+    /// about where the names are visible.
+    ///
+    /// This corresponds to the `gethostname` value.
+    #[inline]
+    pub fn nodename(&self) -> &CStr {
+        Self::to_cstr(self.0.nodename.as_ptr().cast())
+    }
+
+    /// `release`—Operating system release version string
+    #[inline]
+    pub fn release(&self) -> &CStr {
+        Self::to_cstr(self.0.release.as_ptr().cast())
+    }
+
+    /// `version`—Operating system build identifiers
+    #[inline]
+    pub fn version(&self) -> &CStr {
+        Self::to_cstr(self.0.version.as_ptr().cast())
+    }
+
+    /// `machine`—Hardware architecture identifier
+    #[inline]
+    pub fn machine(&self) -> &CStr {
+        Self::to_cstr(self.0.machine.as_ptr().cast())
+    }
+
+    /// `domainname`—NIS or YP domain identifier
+    #[cfg(linux_kernel)]
+    #[inline]
+    pub fn domainname(&self) -> &CStr {
+        Self::to_cstr(self.0.domainname.as_ptr().cast())
+    }
+
+    #[inline]
+    fn to_cstr<'a>(ptr: *const u8) -> &'a CStr {
+        // SAFETY: Strings returned from the kernel are always NUL-terminated.
+        unsafe { CStr::from_ptr(ptr.cast()) }
+    }
+}
+
+impl fmt::Debug for Uname {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        #[cfg(not(linux_kernel))]
+        {
+            write!(
+                fmt,
+                "{:?} {:?} {:?} {:?} {:?}",
+                self.sysname(),
+                self.nodename(),
+                self.release(),
+                self.version(),
+                self.machine(),
+            )
+        }
+        #[cfg(linux_kernel)]
+        {
+            write!(
+                fmt,
+                "{:?} {:?} {:?} {:?} {:?} {:?}",
+                self.sysname(),
+                self.nodename(),
+                self.release(),
+                self.version(),
+                self.machine(),
+                self.domainname(),
+            )
+        }
+    }
+}
+
+/// `sysinfo()`—Returns status information about the runtime OS.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/uname.2.html
+#[cfg(linux_kernel)]
+#[inline]
+pub fn sysinfo() -> Sysinfo {
+    backend::system::syscalls::sysinfo()
+}
+
+/// `sethostname(name)`—Sets the system host name.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/sethostname.2.html
+#[cfg(not(any(
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+#[inline]
+pub fn sethostname(name: &[u8]) -> io::Result<()> {
+    backend::system::syscalls::sethostname(name)
+}
+
+/// Reboot command for use with [`reboot`].
+#[cfg(target_os = "linux")]
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(i32)]
+#[non_exhaustive]
+pub enum RebootCommand {
+    /// Disables the Ctrl-Alt-Del keystroke.
+    ///
+    /// When disabled, the keystroke will send a [`Signal::Int`] to pid 1.
+    ///
+    /// [`Signal::Int`]: crate::process::Signal::Int
+    CadOff = c::LINUX_REBOOT_CMD_CAD_OFF,
+    /// Enables the Ctrl-Alt-Del keystroke.
+    ///
+    /// When enabled, the keystroke will trigger a [`Restart`].
+    ///
+    /// [`Restart`]: Self::Restart
+    CadOn = c::LINUX_REBOOT_CMD_CAD_ON,
+    /// Prints the message "System halted" and halts the system
+    Halt = c::LINUX_REBOOT_CMD_HALT,
+    /// Execute a kernel that has been loaded earlier with [`kexec_load`].
+    ///
+    /// [`kexec_load`]: https://man7.org/linux/man-pages/man2/kexec_load.2.html
+    Kexec = c::LINUX_REBOOT_CMD_KEXEC,
+    /// Prints the message "Power down.", stops the system, and tries to remove
+    /// all power
+    PowerOff = c::LINUX_REBOOT_CMD_POWER_OFF,
+    /// Prints the message "Restarting system." and triggers a restart
+    Restart = c::LINUX_REBOOT_CMD_RESTART,
+    /// Hibernate the system by suspending to disk
+    SwSuspend = c::LINUX_REBOOT_CMD_SW_SUSPEND,
+}
+
+/// `reboot`—Reboot the system or enable/disable Ctrl-Alt-Del
+///
+/// The reboot syscall, despite the name, can actually do much more than
+/// reboot.
+///
+/// Among other things, it can:
+/// - Restart, Halt, Power Off, and Suspend the system
+/// - Enable and disable the Ctrl-Alt-Del keystroke
+/// - Execute other kernels
+/// - Terminate init inside PID namespaces
+///
+/// It is highly recommended to carefully read the kernel documentation before
+/// calling this function.
+///
+/// # References
+/// - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/reboot.2.html
+#[cfg(target_os = "linux")]
+pub fn reboot(cmd: RebootCommand) -> io::Result<()> {
+    backend::system::syscalls::reboot(cmd)
+}
diff --git a/vendor/rustix/src/termios/ioctl.rs b/vendor/rustix/src/termios/ioctl.rs
new file mode 100644
index 0000000..620ae4c
--- /dev/null
+++ b/vendor/rustix/src/termios/ioctl.rs
@@ -0,0 +1,53 @@
+//! Terminal-related `ioctl` functions.
+
+#![allow(unsafe_code)]
+
+use crate::fd::AsFd;
+use crate::{backend, io, ioctl};
+use backend::c;
+
+/// `ioctl(fd, TIOCEXCL)`—Enables exclusive mode on a terminal.
+///
+/// # References
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man4/tty_ioctl.4.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=tty&sektion=4
+/// [NetBSD]: https://man.netbsd.org/tty.4
+/// [OpenBSD]: https://man.openbsd.org/tty.4
+#[cfg(not(any(windows, target_os = "redox", target_os = "wasi")))]
+#[inline]
+#[doc(alias = "TIOCEXCL")]
+pub fn ioctl_tiocexcl<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    // SAFETY: TIOCEXCL is a no-argument setter opcode.
+    unsafe {
+        let ctl = ioctl::NoArg::<ioctl::BadOpcode<{ c::TIOCEXCL as _ }>>::new();
+        ioctl::ioctl(fd, ctl)
+    }
+}
+
+/// `ioctl(fd, TIOCNXCL)`—Disables exclusive mode on a terminal.
+///
+/// # References
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man4/tty_ioctl.4.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=tty&sektion=4
+/// [NetBSD]: https://man.netbsd.org/tty.4
+/// [OpenBSD]: https://man.openbsd.org/tty.4
+#[cfg(not(any(windows, target_os = "redox", target_os = "wasi")))]
+#[inline]
+#[doc(alias = "TIOCNXCL")]
+pub fn ioctl_tiocnxcl<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    // SAFETY: TIOCNXCL is a no-argument setter opcode.
+    unsafe {
+        let ctl = ioctl::NoArg::<ioctl::BadOpcode<{ c::TIOCNXCL as _ }>>::new();
+        ioctl::ioctl(fd, ctl)
+    }
+}
diff --git a/vendor/rustix/src/termios/mod.rs b/vendor/rustix/src/termios/mod.rs
new file mode 100644
index 0000000..c61d3f1
--- /dev/null
+++ b/vendor/rustix/src/termios/mod.rs
@@ -0,0 +1,27 @@
+//! Terminal I/O stream operations.
+//!
+//! This API automatically supports setting arbitrary I/O speeds, on any
+//! platform that supports them, including Linux and the BSDs.
+//!
+//! The [`speed`] module contains various predefined speed constants which
+//! are more likely to be portable, however any `u32` value can be passed to
+//! [`Termios::set_input_speed`], and it will simply fail if the speed is not
+//! supported by the platform.
+
+#[cfg(not(any(target_os = "espidf", target_os = "haiku", target_os = "wasi")))]
+mod ioctl;
+#[cfg(not(target_os = "wasi"))]
+mod tc;
+#[cfg(not(windows))]
+mod tty;
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+mod types;
+
+#[cfg(not(any(target_os = "espidf", target_os = "haiku", target_os = "wasi")))]
+pub use ioctl::*;
+#[cfg(not(target_os = "wasi"))]
+pub use tc::*;
+#[cfg(not(windows))]
+pub use tty::*;
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+pub use types::*;
diff --git a/vendor/rustix/src/termios/tc.rs b/vendor/rustix/src/termios/tc.rs
new file mode 100644
index 0000000..58ba2c2
--- /dev/null
+++ b/vendor/rustix/src/termios/tc.rs
@@ -0,0 +1,209 @@
+use crate::fd::AsFd;
+#[cfg(not(target_os = "espidf"))]
+use crate::termios::{Action, OptionalActions, QueueSelector, Termios, Winsize};
+use crate::{backend, io};
+
+pub use crate::pid::Pid;
+
+/// `tcgetattr(fd)`—Get terminal attributes.
+///
+/// Also known as the `TCGETS` (or `TCGETS2` on Linux) operation with `ioctl`.
+///
+/// # References
+///  - [POSIX `tcgetattr`]
+///  - [Linux `ioctl_tty`]
+///  - [Linux `termios`]
+///
+/// [POSIX `tcgetattr`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/tcgetattr.html
+/// [Linux `ioctl_tty`]: https://man7.org/linux/man-pages/man4/tty_ioctl.4.html
+/// [Linux `termios`]: https://man7.org/linux/man-pages/man3/termios.3.html
+#[cfg(not(any(windows, target_os = "espidf", target_os = "wasi")))]
+#[inline]
+#[doc(alias = "TCGETS")]
+#[doc(alias = "TCGETS2")]
+#[doc(alias = "tcgetattr2")]
+pub fn tcgetattr<Fd: AsFd>(fd: Fd) -> io::Result<Termios> {
+    backend::termios::syscalls::tcgetattr(fd.as_fd())
+}
+
+/// `tcgetwinsize(fd)`—Get the current terminal window size.
+///
+/// Also known as the `TIOCGWINSZ` operation with `ioctl`.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man4/tty_ioctl.4.html
+#[cfg(not(any(windows, target_os = "espidf", target_os = "wasi")))]
+#[inline]
+#[doc(alias = "TIOCGWINSZ")]
+pub fn tcgetwinsize<Fd: AsFd>(fd: Fd) -> io::Result<Winsize> {
+    backend::termios::syscalls::tcgetwinsize(fd.as_fd())
+}
+
+/// `tcgetpgrp(fd)`—Get the terminal foreground process group.
+///
+/// Also known as the `TIOCGPGRP` operation with `ioctl`.
+///
+/// On Linux, if `fd` is a pseudo-terminal, the underlying system call here can
+/// return a pid of 0, which rustix's `Pid` type doesn't support. So rustix
+/// instead handles this case by failing with [`io::Errno::OPNOTSUPP`] if the
+/// pid is 0.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/tcgetpgrp.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/tcgetpgrp.3.html
+#[cfg(not(any(windows, target_os = "wasi")))]
+#[inline]
+#[doc(alias = "TIOCGPGRP")]
+pub fn tcgetpgrp<Fd: AsFd>(fd: Fd) -> io::Result<Pid> {
+    backend::termios::syscalls::tcgetpgrp(fd.as_fd())
+}
+
+/// `tcsetpgrp(fd, pid)`—Set the terminal foreground process group.
+///
+/// Also known as the `TIOCSPGRP` operation with `ioctl`.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/tcsetpgrp.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/tcsetpgrp.3.html
+#[cfg(not(any(windows, target_os = "wasi")))]
+#[inline]
+#[doc(alias = "TIOCSPGRP")]
+pub fn tcsetpgrp<Fd: AsFd>(fd: Fd, pid: Pid) -> io::Result<()> {
+    backend::termios::syscalls::tcsetpgrp(fd.as_fd(), pid)
+}
+
+/// `tcsetattr(fd)`—Set terminal attributes.
+///
+/// Also known as the `TCSETS` (or `TCSETS2 on Linux) operation with `ioctl`.
+///
+/// # References
+///  - [POSIX `tcsetattr`]
+///  - [Linux `ioctl_tty`]
+///  - [Linux `termios`]
+///
+/// [POSIX `tcsetattr`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/tcsetattr.html
+/// [Linux `ioctl_tty`]: https://man7.org/linux/man-pages/man4/tty_ioctl.4.html
+/// [Linux `termios`]: https://man7.org/linux/man-pages/man3/termios.3.html
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+#[doc(alias = "TCSETS")]
+#[doc(alias = "TCSETS2")]
+#[doc(alias = "tcsetattr2")]
+pub fn tcsetattr<Fd: AsFd>(
+    fd: Fd,
+    optional_actions: OptionalActions,
+    termios: &Termios,
+) -> io::Result<()> {
+    backend::termios::syscalls::tcsetattr(fd.as_fd(), optional_actions, termios)
+}
+
+/// `tcsendbreak(fd, 0)`—Transmit zero-valued bits.
+///
+/// Also known as the `TCSBRK` operation with `ioctl`, with a duration of 0.
+///
+/// This function always uses an effective duration parameter of zero. For the
+/// equivalent of a `tcsendbreak` with a non-zero duration parameter, use
+/// `tcdrain`.
+///
+/// # References
+///  - [POSIX `tcsendbreak`]
+///  - [Linux `ioctl_tty`]
+///  - [Linux `termios`]
+///
+/// [POSIX `tcsendbreak`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/tcsendbreak.html
+/// [Linux `ioctl_tty`]: https://man7.org/linux/man-pages/man4/tty_ioctl.4.html
+/// [Linux `termios`]: https://man7.org/linux/man-pages/man3/termios.3.html
+#[inline]
+#[doc(alias = "TCSBRK")]
+pub fn tcsendbreak<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    backend::termios::syscalls::tcsendbreak(fd.as_fd())
+}
+
+/// `tcdrain(fd, duration)`—Wait until all pending output has been written.
+///
+/// # References
+///  - [POSIX `tcdrain`]
+///  - [Linux `ioctl_tty`]
+///  - [Linux `termios`]
+///
+/// [POSIX `tcsetattr`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/tcdrain.html
+/// [Linux `ioctl_tty`]: https://man7.org/linux/man-pages/man4/tty_ioctl.4.html
+/// [Linux `termios`]: https://man7.org/linux/man-pages/man3/termios.3.html
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+pub fn tcdrain<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    backend::termios::syscalls::tcdrain(fd.as_fd())
+}
+
+/// `tcflush(fd, queue_selector)`—Wait until all pending output has been
+/// written.
+///
+/// # References
+///  - [POSIX `tcflush`]
+///  - [Linux `ioctl_tty`]
+///  - [Linux `termios`]
+///
+/// [POSIX `tcflush`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/tcflush.html
+/// [Linux `ioctl_tty`]: https://man7.org/linux/man-pages/man4/tty_ioctl.4.html
+/// [Linux `termios`]: https://man7.org/linux/man-pages/man3/termios.3.html
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+#[doc(alias = "TCFLSH")]
+pub fn tcflush<Fd: AsFd>(fd: Fd, queue_selector: QueueSelector) -> io::Result<()> {
+    backend::termios::syscalls::tcflush(fd.as_fd(), queue_selector)
+}
+
+/// `tcflow(fd, action)`—Suspend or resume transmission or reception.
+///
+/// # References
+///  - [POSIX `tcflow`]
+///  - [Linux `ioctl_tty`]
+///  - [Linux `termios`]
+///
+/// [POSIX `tcflow`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/tcflow.html
+/// [Linux `ioctl_tty`]: https://man7.org/linux/man-pages/man4/tty_ioctl.4.html
+/// [Linux `termios`]: https://man7.org/linux/man-pages/man3/termios.3.html
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+#[doc(alias = "TCXONC")]
+pub fn tcflow<Fd: AsFd>(fd: Fd, action: Action) -> io::Result<()> {
+    backend::termios::syscalls::tcflow(fd.as_fd(), action)
+}
+
+/// `tcgetsid(fd)`—Return the session ID of the current session with `fd` as
+/// its controlling terminal.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/tcgetsid.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/tcgetsid.3.html
+#[inline]
+#[doc(alias = "TIOCGSID")]
+pub fn tcgetsid<Fd: AsFd>(fd: Fd) -> io::Result<Pid> {
+    backend::termios::syscalls::tcgetsid(fd.as_fd())
+}
+
+/// `tcsetwinsize(fd)`—Set the current terminal window size.
+///
+/// Also known as the `TIOCSWINSZ` operation with `ioctl`.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man4/tty_ioctl.4.html
+#[cfg(not(target_os = "espidf"))]
+#[inline]
+#[doc(alias = "TIOCSWINSZ")]
+pub fn tcsetwinsize<Fd: AsFd>(fd: Fd, winsize: Winsize) -> io::Result<()> {
+    backend::termios::syscalls::tcsetwinsize(fd.as_fd(), winsize)
+}
diff --git a/vendor/rustix/src/termios/tty.rs b/vendor/rustix/src/termios/tty.rs
new file mode 100644
index 0000000..b14e602
--- /dev/null
+++ b/vendor/rustix/src/termios/tty.rs
@@ -0,0 +1,84 @@
+//! Functions which operate on file descriptors which might be terminals.
+
+use crate::backend;
+use backend::fd::AsFd;
+#[cfg(all(feature = "alloc", feature = "procfs"))]
+#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))]
+use {
+    crate::ffi::CString, crate::io, crate::path::SMALL_PATH_BUFFER_SIZE, alloc::vec::Vec,
+    backend::fd::BorrowedFd,
+};
+
+/// `isatty(fd)`—Tests whether a file descriptor refers to a terminal.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/isatty.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/isatty.3.html
+#[inline]
+pub fn isatty<Fd: AsFd>(fd: Fd) -> bool {
+    backend::termios::syscalls::isatty(fd.as_fd())
+}
+
+/// `ttyname_r(fd)`
+///
+/// If `reuse` already has available capacity, reuse it if possible.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/ttyname.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/ttyname.3.html
+#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))]
+#[cfg(all(feature = "alloc", feature = "procfs"))]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "procfs")))]
+#[doc(alias = "ttyname_r")]
+#[inline]
+pub fn ttyname<Fd: AsFd, B: Into<Vec<u8>>>(dirfd: Fd, reuse: B) -> io::Result<CString> {
+    _ttyname(dirfd.as_fd(), reuse.into())
+}
+
+#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))]
+#[cfg(all(feature = "alloc", feature = "procfs"))]
+#[allow(unsafe_code)]
+fn _ttyname(dirfd: BorrowedFd<'_>, mut buffer: Vec<u8>) -> io::Result<CString> {
+    buffer.clear();
+    buffer.reserve(SMALL_PATH_BUFFER_SIZE);
+
+    loop {
+        match backend::termios::syscalls::ttyname(dirfd, buffer.spare_capacity_mut()) {
+            Err(io::Errno::RANGE) => {
+                // Use `Vec` reallocation strategy to grow capacity
+                // exponentially.
+                buffer.reserve(buffer.capacity() + 1);
+            }
+            Ok(len) => {
+                // SAFETY: Assume the backend returns the length of the string
+                // excluding the NUL.
+                unsafe {
+                    buffer.set_len(len + 1);
+                }
+
+                // SAFETY:
+                // - “ttyname_r stores this pathname in the buffer buf”
+                // - [POSIX definition 3.271: Pathname]: “A string that is used
+                //   to identify a file.”
+                // - [POSIX definition 3.375: String]: “A contiguous sequence
+                //   of bytes terminated by and including the first null byte.”
+                //
+                // Thus, there will be a single NUL byte at the end of the
+                // string.
+                //
+                // [POSIX definition 3.271: Pathname]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_271
+                // [POSIX definition 3.375: String]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_375
+                unsafe {
+                    return Ok(CString::from_vec_with_nul_unchecked(buffer));
+                }
+            }
+            Err(errno) => return Err(errno),
+        }
+    }
+}
diff --git a/vendor/rustix/src/termios/types.rs b/vendor/rustix/src/termios/types.rs
new file mode 100644
index 0000000..57e9a5d
--- /dev/null
+++ b/vendor/rustix/src/termios/types.rs
@@ -0,0 +1,1450 @@
+use crate::backend::c;
+use crate::{backend, io};
+use bitflags::bitflags;
+
+/// `struct termios` for use with [`tcgetattr`] and [`tcsetattr`].
+///
+/// [`tcgetattr`]: crate::termios::tcgetattr
+/// [`tcsetattr`]: crate::termios::tcsetattr
+#[repr(C)]
+#[derive(Clone)]
+pub struct Termios {
+    /// How is input interpreted?
+    #[doc(alias = "c_iflag")]
+    pub input_modes: InputModes,
+
+    /// How is output translated?
+    #[doc(alias = "c_oflag")]
+    pub output_modes: OutputModes,
+
+    /// Low-level configuration flags.
+    #[doc(alias = "c_cflag")]
+    pub control_modes: ControlModes,
+
+    /// High-level configuration flags.
+    #[doc(alias = "c_lflag")]
+    pub local_modes: LocalModes,
+
+    /// Line discipline.
+    #[doc(alias = "c_line")]
+    #[cfg(not(all(linux_raw, any(target_arch = "powerpc", target_arch = "powerpc64"))))]
+    #[cfg(any(
+        linux_like,
+        target_env = "newlib",
+        target_os = "fuchsia",
+        target_os = "haiku",
+        target_os = "redox"
+    ))]
+    pub line_discipline: c::cc_t,
+
+    /// How are various special control codes handled?
+    #[doc(alias = "c_cc")]
+    #[cfg(not(target_os = "haiku"))]
+    pub special_codes: SpecialCodes,
+
+    #[cfg(target_os = "nto")]
+    pub(crate) __reserved: [c::c_uint; 3],
+
+    /// Line discipline.
+    // On PowerPC, this field comes after `c_cc`.
+    #[doc(alias = "c_line")]
+    #[cfg(all(linux_raw, any(target_arch = "powerpc", target_arch = "powerpc64")))]
+    pub line_discipline: c::cc_t,
+
+    /// See the `input_speed` and `set_input_seed` functions.
+    ///
+    /// On Linux and BSDs, this is the arbitrary integer speed value. On all
+    /// other platforms, this is the encoded speed value.
+    #[cfg(not(any(solarish, all(libc, target_env = "newlib"), target_os = "aix")))]
+    pub(crate) input_speed: c::speed_t,
+
+    /// See the `output_speed` and `set_output_seed` functions.
+    ///
+    /// On Linux and BSDs, this is the integer speed value. On all other
+    /// platforms, this is the encoded speed value.
+    #[cfg(not(any(solarish, all(libc, target_env = "newlib"), target_os = "aix")))]
+    pub(crate) output_speed: c::speed_t,
+
+    /// How are various special control codes handled?
+    #[doc(alias = "c_cc")]
+    #[cfg(target_os = "haiku")]
+    pub special_codes: SpecialCodes,
+}
+
+impl Termios {
+    /// `cfmakeraw(self)`—Set a `Termios` value to the settings for “raw” mode.
+    ///
+    /// In raw mode, input is available a byte at a time, echoing is disabled,
+    /// and special terminal input and output codes are disabled.
+    #[cfg(not(target_os = "nto"))]
+    #[doc(alias = "cfmakeraw")]
+    #[inline]
+    pub fn make_raw(&mut self) {
+        backend::termios::syscalls::cfmakeraw(self)
+    }
+
+    /// Return the input communication speed.
+    ///
+    /// Unlike the `c_ispeed` field in glibc and others, this returns the
+    /// integer value of the speed, rather than the `B*` encoded constant
+    /// value.
+    #[doc(alias = "c_ispeed")]
+    #[doc(alias = "cfgetispeed")]
+    #[doc(alias = "cfgetspeed")]
+    #[inline]
+    pub fn input_speed(&self) -> u32 {
+        // On Linux and BSDs, `input_speed` is the arbitrary integer speed.
+        #[cfg(any(linux_kernel, bsd))]
+        {
+            debug_assert!(u32::try_from(self.input_speed).is_ok());
+            self.input_speed as u32
+        }
+
+        // On illumos, `input_speed` is not present.
+        #[cfg(any(solarish, all(libc, target_env = "newlib"), target_os = "aix"))]
+        unsafe {
+            speed::decode(c::cfgetispeed(crate::utils::as_ptr(self).cast())).unwrap()
+        }
+
+        // On other platforms, it's the encoded speed.
+        #[cfg(not(any(
+            linux_kernel,
+            bsd,
+            solarish,
+            all(libc, target_env = "newlib"),
+            target_os = "aix"
+        )))]
+        {
+            speed::decode(self.input_speed).unwrap()
+        }
+    }
+
+    /// Return the output communication speed.
+    ///
+    /// Unlike the `c_ospeed` field in glibc and others, this returns the
+    /// arbitrary integer value of the speed, rather than the `B*` encoded
+    /// constant value.
+    #[inline]
+    pub fn output_speed(&self) -> u32 {
+        // On Linux and BSDs, `input_speed` is the arbitrary integer speed.
+        #[cfg(any(linux_kernel, bsd))]
+        {
+            debug_assert!(u32::try_from(self.output_speed).is_ok());
+            self.output_speed as u32
+        }
+
+        // On illumos, `output_speed` is not present.
+        #[cfg(any(solarish, all(libc, target_env = "newlib"), target_os = "aix"))]
+        unsafe {
+            speed::decode(c::cfgetospeed(crate::utils::as_ptr(self).cast())).unwrap()
+        }
+
+        // On other platforms, it's the encoded speed.
+        #[cfg(not(any(
+            linux_kernel,
+            bsd,
+            solarish,
+            all(libc, target_env = "newlib"),
+            target_os = "aix"
+        )))]
+        {
+            speed::decode(self.output_speed).unwrap()
+        }
+    }
+
+    /// Set the input and output communication speeds.
+    ///
+    /// Unlike the `c_ispeed` and `c_ospeed` fields in glibc and others, this
+    /// takes the arbitrary integer value of the speed, rather than the `B*`
+    /// encoded constant value. Not all implementations support all integer
+    /// values; use the constants in the [`speed`] module for likely-supported
+    /// speeds.
+    #[cfg(not(target_os = "nto"))]
+    #[doc(alias = "cfsetspeed")]
+    #[doc(alias = "CBAUD")]
+    #[doc(alias = "CBAUDEX")]
+    #[doc(alias = "CIBAUD")]
+    #[doc(alias = "CIBAUDEX")]
+    #[inline]
+    pub fn set_speed(&mut self, new_speed: u32) -> io::Result<()> {
+        backend::termios::syscalls::set_speed(self, new_speed)
+    }
+
+    /// Set the input communication speed.
+    ///
+    /// Unlike the `c_ispeed` field in glibc and others, this takes the
+    /// arbitrary integer value of the speed, rather than the `B*` encoded
+    /// constant value. Not all implementations support all integer values; use
+    /// the constants in the [`speed`] module for known-supported speeds.
+    ///
+    /// On some platforms, changing the input speed changes the output speed
+    /// to the same speed.
+    #[doc(alias = "c_ispeed")]
+    #[doc(alias = "cfsetispeed")]
+    #[doc(alias = "CIBAUD")]
+    #[doc(alias = "CIBAUDEX")]
+    #[inline]
+    pub fn set_input_speed(&mut self, new_speed: u32) -> io::Result<()> {
+        backend::termios::syscalls::set_input_speed(self, new_speed)
+    }
+
+    /// Set the output communication speed.
+    ///
+    /// Unlike the `c_ospeed` field in glibc and others, this takes the
+    /// arbitrary integer value of the speed, rather than the `B*` encoded
+    /// constant value. Not all implementations support all integer values; use
+    /// the constants in the [`speed`] module for known-supported speeds.
+    ///
+    /// On some platforms, changing the output speed changes the input speed
+    /// to the same speed.
+    #[doc(alias = "c_ospeed")]
+    #[doc(alias = "cfsetospeed")]
+    #[doc(alias = "CBAUD")]
+    #[doc(alias = "CBAUDEX")]
+    #[inline]
+    pub fn set_output_speed(&mut self, new_speed: u32) -> io::Result<()> {
+        backend::termios::syscalls::set_output_speed(self, new_speed)
+    }
+}
+
+impl core::fmt::Debug for Termios {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        let mut d = f.debug_struct("Termios");
+        d.field("input_modes", &self.input_modes);
+        d.field("output_modes", &self.output_modes);
+        d.field("control_modes", &self.control_modes);
+        d.field("local_modes", &self.local_modes);
+        #[cfg(any(
+            linux_like,
+            target_env = "newlib",
+            target_os = "fuchsia",
+            target_os = "haiku",
+            target_os = "redox"
+        ))]
+        {
+            d.field("line_discipline", &self.line_discipline);
+        }
+        d.field("special_codes", &self.special_codes);
+        d.field("input_speed", &self.input_speed());
+        d.field("output_speed", &self.output_speed());
+        d.finish()
+    }
+}
+
+bitflags! {
+    /// Flags controlling terminal input.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct InputModes: c::tcflag_t {
+        /// `IGNBRK`
+        const IGNBRK = c::IGNBRK;
+
+        /// `BRKINT`
+        const BRKINT = c::BRKINT;
+
+        /// `IGNPAR`
+        const IGNPAR = c::IGNPAR;
+
+        /// `PARMRK`
+        const PARMRK = c::PARMRK;
+
+        /// `INPCK`
+        const INPCK = c::INPCK;
+
+        /// `ISTRIP`
+        const ISTRIP = c::ISTRIP;
+
+        /// `INLCR`
+        const INLCR = c::INLCR;
+
+        /// `IGNCR`
+        const IGNCR = c::IGNCR;
+
+        /// `ICRNL`
+        const ICRNL = c::ICRNL;
+
+        /// `IUCLC`
+        #[cfg(any(linux_kernel, solarish, target_os = "aix", target_os = "haiku", target_os = "nto"))]
+        const IUCLC = c::IUCLC;
+
+        /// `IXON`
+        const IXON = c::IXON;
+
+        /// `IXANY`
+        #[cfg(not(target_os = "redox"))]
+        const IXANY = c::IXANY;
+
+        /// `IXOFF`
+        const IXOFF = c::IXOFF;
+
+        /// `IMAXBEL`
+        #[cfg(not(any(target_os = "haiku", target_os = "redox")))]
+        const IMAXBEL = c::IMAXBEL;
+
+        /// `IUTF8`
+        #[cfg(not(any(
+            freebsdlike,
+            netbsdlike,
+            solarish,
+            target_os = "aix",
+            target_os = "emscripten",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "redox",
+        )))]
+        const IUTF8 = c::IUTF8;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// Flags controlling terminal output.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct OutputModes: c::tcflag_t {
+        /// `OPOST`
+        const OPOST = c::OPOST;
+
+        /// `OLCUC`
+        #[cfg(not(any(
+            apple,
+            freebsdlike,
+            target_os = "aix",
+            target_os = "netbsd",
+            target_os = "redox",
+        )))]
+        const OLCUC = c::OLCUC;
+
+        /// `ONLCR`
+        const ONLCR = c::ONLCR;
+
+        /// `OCRNL`
+        const OCRNL = c::OCRNL;
+
+        /// `ONOCR`
+        const ONOCR = c::ONOCR;
+
+        /// `ONLRET`
+        const ONLRET = c::ONLRET;
+
+        /// `OFILL`
+        #[cfg(not(bsd))]
+        const OFILL = c::OFILL;
+
+        /// `OFDEL`
+        #[cfg(not(bsd))]
+        const OFDEL = c::OFDEL;
+
+        /// `NLDLY`
+        #[cfg(not(any(bsd, solarish, target_os = "redox")))]
+        const NLDLY = c::NLDLY;
+
+        /// `NL0`
+        #[cfg(not(any(bsd, solarish, target_os = "fuchsia", target_os = "redox")))]
+        const NL0 = c::NL0;
+
+        /// `NL1`
+        #[cfg(not(any(bsd, solarish, target_os = "fuchsia", target_os = "redox")))]
+        const NL1 = c::NL1;
+
+        /// `CRDLY`
+        #[cfg(not(any(bsd, solarish, target_os = "redox")))]
+        const CRDLY = c::CRDLY;
+
+        /// `CR0`
+        #[cfg(not(any(bsd, solarish, target_os = "fuchsia", target_os = "redox")))]
+        const CR0 = c::CR0;
+
+        /// `CR1`
+        #[cfg(not(any(
+            target_env = "musl",
+            bsd,
+            solarish,
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "redox",
+        )))]
+        const CR1 = c::CR1;
+
+        /// `CR2`
+        #[cfg(not(any(
+            target_env = "musl",
+            bsd,
+            solarish,
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "redox",
+        )))]
+        const CR2 = c::CR2;
+
+        /// `CR3`
+        #[cfg(not(any(
+            target_env = "musl",
+            bsd,
+            solarish,
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "redox",
+        )))]
+        const CR3 = c::CR3;
+
+        /// `TABDLY`
+        #[cfg(not(any(
+            netbsdlike,
+            solarish,
+            target_os = "dragonfly",
+            target_os = "redox",
+        )))]
+        const TABDLY = c::TABDLY;
+
+        /// `TAB0`
+        #[cfg(not(any(
+            netbsdlike,
+            solarish,
+            target_os = "dragonfly",
+            target_os = "fuchsia",
+            target_os = "redox",
+        )))]
+        const TAB0 = c::TAB0;
+
+        /// `TAB1`
+        #[cfg(not(any(
+            target_env = "musl",
+            bsd,
+            solarish,
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "redox",
+        )))]
+        const TAB1 = c::TAB1;
+
+        /// `TAB2`
+        #[cfg(not(any(
+            target_env = "musl",
+            bsd,
+            solarish,
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "redox",
+        )))]
+        const TAB2 = c::TAB2;
+
+        /// `TAB3`
+        #[cfg(not(any(
+            target_env = "musl",
+            bsd,
+            solarish,
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "redox",
+        )))]
+        const TAB3 = c::TAB3;
+
+        /// `XTABS`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            target_os = "aix",
+            target_os = "haiku",
+            target_os = "redox",
+        )))]
+        const XTABS = c::XTABS;
+
+        /// `BSDLY`
+        #[cfg(not(any(bsd, solarish, target_os = "redox")))]
+        const BSDLY = c::BSDLY;
+
+        /// `BS0`
+        #[cfg(not(any(bsd, solarish, target_os = "fuchsia", target_os = "redox")))]
+        const BS0 = c::BS0;
+
+        /// `BS1`
+        #[cfg(not(any(
+            target_env = "musl",
+            bsd,
+            solarish,
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "redox",
+        )))]
+        const BS1 = c::BS1;
+
+        /// `FFDLY`
+        #[cfg(not(any(bsd, solarish, target_os = "redox")))]
+        const FFDLY = c::FFDLY;
+
+        /// `FF0`
+        #[cfg(not(any(bsd, solarish, target_os = "fuchsia", target_os = "redox")))]
+        const FF0 = c::FF0;
+
+        /// `FF1`
+        #[cfg(not(any(
+            target_env = "musl",
+            bsd,
+            solarish,
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "redox",
+        )))]
+        const FF1 = c::FF1;
+
+        /// `VTDLY`
+        #[cfg(not(any(bsd, solarish, target_os = "redox")))]
+        const VTDLY = c::VTDLY;
+
+        /// `VT0`
+        #[cfg(not(any(bsd, solarish, target_os = "fuchsia", target_os = "redox")))]
+        const VT0 = c::VT0;
+
+        /// `VT1`
+        #[cfg(not(any(
+            target_env = "musl",
+            bsd,
+            solarish,
+            target_os = "emscripten",
+            target_os = "fuchsia",
+            target_os = "redox",
+        )))]
+        const VT1 = c::VT1;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// Flags controlling special terminal modes.
+    ///
+    /// `CBAUD`, `CBAUDEX`, `CIBAUD`, and `CIBAUDEX` are not defined here,
+    /// because they're handled automatically by [`Termios::set_speed`] and
+    /// related functions.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct ControlModes: c::tcflag_t {
+        /// `CSIZE`
+        const CSIZE = c::CSIZE;
+
+        /// `CS5`
+        const CS5 = c::CS5;
+
+        /// `CS6`
+        const CS6 = c::CS6;
+
+        /// `CS7`
+        const CS7 = c::CS7;
+
+        /// `CS8`
+        const CS8 = c::CS8;
+
+        /// `CSTOPB`
+        const CSTOPB = c::CSTOPB;
+
+        /// `CREAD`
+        const CREAD = c::CREAD;
+
+        /// `PARENB`
+        const PARENB = c::PARENB;
+
+        /// `PARODD`
+        const PARODD = c::PARODD;
+
+        /// `HUPCL`
+        const HUPCL = c::HUPCL;
+
+        /// `CLOCAL`
+        const CLOCAL = c::CLOCAL;
+
+        /// `CRTSCTS`
+        #[cfg(not(any(target_os = "aix", target_os = "nto", target_os = "redox")))]
+        const CRTSCTS = c::CRTSCTS;
+
+        /// `CMSPAR`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            target_os = "aix",
+            target_os = "emscripten",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "nto",
+            target_os = "redox",
+        )))]
+        const CMSPAR = c::CMSPAR;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// Flags controlling “local” terminal modes.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct LocalModes: c::tcflag_t {
+        /// `XCASE`
+        #[cfg(any(linux_kernel, target_arch = "s390x", target_os = "haiku"))]
+        const XCASE = c::XCASE;
+
+        /// `ECHOCTL`
+        #[cfg(not(target_os = "redox"))]
+        const ECHOCTL = c::ECHOCTL;
+
+        /// `ECHOPRT`
+        #[cfg(not(any(target_os = "nto", target_os = "redox")))]
+        const ECHOPRT = c::ECHOPRT;
+
+        /// `ECHOKE`
+        #[cfg(not(target_os = "redox"))]
+        const ECHOKE = c::ECHOKE;
+
+        /// `FLUSHO`
+        #[cfg(not(any(target_os = "nto", target_os = "redox")))]
+        const FLUSHO = c::FLUSHO;
+
+        /// `PENDIN`
+        #[cfg(not(any(target_os = "nto", target_os = "redox")))]
+        const PENDIN = c::PENDIN;
+
+        /// `EXTPROC`
+        #[cfg(not(any(target_os = "aix", target_os = "haiku", target_os = "nto", target_os = "redox")))]
+        const EXTPROC = c::EXTPROC;
+
+        /// `ISIG`
+        const ISIG = c::ISIG;
+
+        /// `ICANON`—A flag for the `c_lflag` field of [`Termios`] indicating
+        /// canonical mode.
+        const ICANON = c::ICANON;
+
+        /// `ECHO`
+        const ECHO = c::ECHO;
+
+        /// `ECHOE`
+        const ECHOE = c::ECHOE;
+
+        /// `ECHOK`
+        const ECHOK = c::ECHOK;
+
+        /// `ECHONL`
+        const ECHONL = c::ECHONL;
+
+        /// `NOFLSH`
+        const NOFLSH = c::NOFLSH;
+
+        /// `TOSTOP`
+        const TOSTOP = c::TOSTOP;
+
+        /// `IEXTEN`
+        const IEXTEN = c::IEXTEN;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// Speeds for use with [`Termios::set_input_speed`] and
+/// [`Termios::set_output_speed`].
+///
+/// Unlike in some platforms' libc APIs, these always have the same numerical
+/// value as their names; for example, `B50` has the value `50`, and so on.
+/// Consequently, it's not necessary to use them. They are provided here
+/// because they help identify speeds which are likely to be supported, on
+/// platforms which don't support arbitrary speeds.
+pub mod speed {
+    #[cfg(not(bsd))]
+    use crate::backend::c;
+
+    /// `B0`
+    pub const B0: u32 = 0;
+
+    /// `B50`
+    pub const B50: u32 = 50;
+
+    /// `B75`
+    pub const B75: u32 = 75;
+
+    /// `B110`
+    pub const B110: u32 = 110;
+
+    /// `B134`
+    pub const B134: u32 = 134;
+
+    /// `B150`
+    pub const B150: u32 = 150;
+
+    /// `B200`
+    pub const B200: u32 = 200;
+
+    /// `B300`
+    pub const B300: u32 = 300;
+
+    /// `B600`
+    pub const B600: u32 = 600;
+
+    /// `B1200`
+    pub const B1200: u32 = 1200;
+
+    /// `B1800`
+    pub const B1800: u32 = 1800;
+
+    /// `B2400`
+    pub const B2400: u32 = 2400;
+
+    /// `B4800`
+    pub const B4800: u32 = 4800;
+
+    /// `B9600`
+    pub const B9600: u32 = 9600;
+
+    /// `B19200`
+    #[doc(alias = "EXTA")]
+    pub const B19200: u32 = 19200;
+
+    /// `B38400`
+    #[doc(alias = "EXTB")]
+    pub const B38400: u32 = 38400;
+
+    /// `B57600`
+    #[cfg(not(target_os = "aix"))]
+    pub const B57600: u32 = 57600;
+
+    /// `B115200`
+    #[cfg(not(target_os = "aix"))]
+    pub const B115200: u32 = 115_200;
+
+    /// `B230400`
+    #[cfg(not(target_os = "aix"))]
+    pub const B230400: u32 = 230_400;
+
+    /// `B460800`
+    #[cfg(not(any(
+        apple,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "haiku",
+        target_os = "openbsd"
+    )))]
+    pub const B460800: u32 = 460_800;
+
+    /// `B500000`
+    #[cfg(not(any(bsd, solarish, target_os = "aix", target_os = "haiku")))]
+    pub const B500000: u32 = 500_000;
+
+    /// `B576000`
+    #[cfg(not(any(bsd, solarish, target_os = "aix", target_os = "haiku")))]
+    pub const B576000: u32 = 576_000;
+
+    /// `B921600`
+    #[cfg(not(any(
+        apple,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "haiku",
+        target_os = "openbsd"
+    )))]
+    pub const B921600: u32 = 921_600;
+
+    /// `B1000000`
+    #[cfg(not(any(bsd, target_os = "aix", target_os = "haiku", target_os = "solaris")))]
+    pub const B1000000: u32 = 1_000_000;
+
+    /// `B1152000`
+    #[cfg(not(any(bsd, target_os = "aix", target_os = "haiku", target_os = "solaris")))]
+    pub const B1152000: u32 = 1_152_000;
+
+    /// `B1500000`
+    #[cfg(not(any(bsd, target_os = "aix", target_os = "haiku", target_os = "solaris")))]
+    pub const B1500000: u32 = 1_500_000;
+
+    /// `B2000000`
+    #[cfg(not(any(bsd, target_os = "aix", target_os = "haiku", target_os = "solaris")))]
+    pub const B2000000: u32 = 2_000_000;
+
+    /// `B2500000`
+    #[cfg(not(any(
+        target_arch = "sparc",
+        target_arch = "sparc64",
+        bsd,
+        target_os = "aix",
+        target_os = "haiku",
+        target_os = "solaris",
+    )))]
+    pub const B2500000: u32 = 2_500_000;
+
+    /// `B3000000`
+    #[cfg(not(any(
+        target_arch = "sparc",
+        target_arch = "sparc64",
+        bsd,
+        target_os = "aix",
+        target_os = "haiku",
+        target_os = "solaris",
+    )))]
+    pub const B3000000: u32 = 3_000_000;
+
+    /// `B3500000`
+    #[cfg(not(any(
+        target_arch = "sparc",
+        target_arch = "sparc64",
+        bsd,
+        target_os = "aix",
+        target_os = "haiku",
+        target_os = "solaris",
+    )))]
+    pub const B3500000: u32 = 3_500_000;
+
+    /// `B4000000`
+    #[cfg(not(any(
+        target_arch = "sparc",
+        target_arch = "sparc64",
+        bsd,
+        target_os = "aix",
+        target_os = "haiku",
+        target_os = "solaris",
+    )))]
+    pub const B4000000: u32 = 4_000_000;
+
+    /// Translate from a `c::speed_t` code to an arbitrary integer speed value
+    /// `u32`.
+    ///
+    /// On BSD platforms, integer speed values are already the same as their
+    /// encoded values, and on Linux platforms, we use `TCGETS2`/`TCSETS2`
+    /// and the `c_ispeed`/`c_ospeed`` fields, except that on Linux on
+    /// PowerPC on QEMU, `TCGETS2`/`TCSETS2` don't set `c_ispeed`/`c_ospeed`.
+    #[cfg(not(any(
+        bsd,
+        all(
+            linux_kernel,
+            not(any(target_arch = "powerpc", target_arch = "powerpc64"))
+        )
+    )))]
+    pub(crate) const fn decode(encoded_speed: c::speed_t) -> Option<u32> {
+        match encoded_speed {
+            c::B0 => Some(0),
+            c::B50 => Some(50),
+            c::B75 => Some(75),
+            c::B110 => Some(110),
+            c::B134 => Some(134),
+            c::B150 => Some(150),
+            c::B200 => Some(200),
+            c::B300 => Some(300),
+            c::B600 => Some(600),
+            c::B1200 => Some(1200),
+            c::B1800 => Some(1800),
+            c::B2400 => Some(2400),
+            c::B4800 => Some(4800),
+            c::B9600 => Some(9600),
+            c::B19200 => Some(19200),
+            c::B38400 => Some(38400),
+            #[cfg(not(target_os = "aix"))]
+            c::B57600 => Some(57600),
+            #[cfg(not(target_os = "aix"))]
+            c::B115200 => Some(115_200),
+            #[cfg(not(any(target_os = "aix", target_os = "nto")))]
+            c::B230400 => Some(230_400),
+            #[cfg(not(any(
+                apple,
+                target_os = "aix",
+                target_os = "dragonfly",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "openbsd"
+            )))]
+            c::B460800 => Some(460_800),
+            #[cfg(not(any(
+                bsd,
+                solarish,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto"
+            )))]
+            c::B500000 => Some(500_000),
+            #[cfg(not(any(
+                bsd,
+                solarish,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto"
+            )))]
+            c::B576000 => Some(576_000),
+            #[cfg(not(any(
+                apple,
+                target_os = "aix",
+                target_os = "dragonfly",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "openbsd"
+            )))]
+            c::B921600 => Some(921_600),
+            #[cfg(not(any(
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris"
+            )))]
+            c::B1000000 => Some(1_000_000),
+            #[cfg(not(any(
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris"
+            )))]
+            c::B1152000 => Some(1_152_000),
+            #[cfg(not(any(
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris"
+            )))]
+            c::B1500000 => Some(1_500_000),
+            #[cfg(not(any(
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris"
+            )))]
+            c::B2000000 => Some(2_000_000),
+            #[cfg(not(any(
+                target_arch = "sparc",
+                target_arch = "sparc64",
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris",
+            )))]
+            c::B2500000 => Some(2_500_000),
+            #[cfg(not(any(
+                target_arch = "sparc",
+                target_arch = "sparc64",
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris",
+            )))]
+            c::B3000000 => Some(3_000_000),
+            #[cfg(not(any(
+                target_arch = "sparc",
+                target_arch = "sparc64",
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris",
+            )))]
+            c::B3500000 => Some(3_500_000),
+            #[cfg(not(any(
+                target_arch = "sparc",
+                target_arch = "sparc64",
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris",
+            )))]
+            c::B4000000 => Some(4_000_000),
+            _ => None,
+        }
+    }
+
+    /// Translate from an arbitrary `u32` arbitrary integer speed value to a
+    /// `c::speed_t` code.
+    #[cfg(not(bsd))]
+    pub(crate) const fn encode(speed: u32) -> Option<c::speed_t> {
+        match speed {
+            0 => Some(c::B0),
+            50 => Some(c::B50),
+            75 => Some(c::B75),
+            110 => Some(c::B110),
+            134 => Some(c::B134),
+            150 => Some(c::B150),
+            200 => Some(c::B200),
+            300 => Some(c::B300),
+            600 => Some(c::B600),
+            1200 => Some(c::B1200),
+            1800 => Some(c::B1800),
+            2400 => Some(c::B2400),
+            4800 => Some(c::B4800),
+            9600 => Some(c::B9600),
+            19200 => Some(c::B19200),
+            38400 => Some(c::B38400),
+            #[cfg(not(target_os = "aix"))]
+            57600 => Some(c::B57600),
+            #[cfg(not(target_os = "aix"))]
+            115_200 => Some(c::B115200),
+            #[cfg(not(any(target_os = "aix", target_os = "nto")))]
+            230_400 => Some(c::B230400),
+            #[cfg(not(any(
+                apple,
+                target_os = "aix",
+                target_os = "dragonfly",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "openbsd",
+            )))]
+            460_800 => Some(c::B460800),
+            #[cfg(not(any(
+                bsd,
+                solarish,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto"
+            )))]
+            500_000 => Some(c::B500000),
+            #[cfg(not(any(
+                bsd,
+                solarish,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto"
+            )))]
+            576_000 => Some(c::B576000),
+            #[cfg(not(any(
+                apple,
+                target_os = "aix",
+                target_os = "dragonfly",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "openbsd"
+            )))]
+            921_600 => Some(c::B921600),
+            #[cfg(not(any(
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris"
+            )))]
+            1_000_000 => Some(c::B1000000),
+            #[cfg(not(any(
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris"
+            )))]
+            1_152_000 => Some(c::B1152000),
+            #[cfg(not(any(
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris"
+            )))]
+            1_500_000 => Some(c::B1500000),
+            #[cfg(not(any(
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris"
+            )))]
+            2_000_000 => Some(c::B2000000),
+            #[cfg(not(any(
+                target_arch = "sparc",
+                target_arch = "sparc64",
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris",
+            )))]
+            2_500_000 => Some(c::B2500000),
+            #[cfg(not(any(
+                target_arch = "sparc",
+                target_arch = "sparc64",
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris",
+            )))]
+            3_000_000 => Some(c::B3000000),
+            #[cfg(not(any(
+                target_arch = "sparc",
+                target_arch = "sparc64",
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris",
+            )))]
+            3_500_000 => Some(c::B3500000),
+            #[cfg(not(any(
+                target_arch = "sparc",
+                target_arch = "sparc64",
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "nto",
+                target_os = "solaris",
+            )))]
+            4_000_000 => Some(c::B4000000),
+            _ => None,
+        }
+    }
+}
+
+/// An array indexed by [`SpecialCodeIndex`] indicating the current values
+/// of various special control codes.
+#[repr(transparent)]
+#[derive(Clone, Debug)]
+pub struct SpecialCodes(pub(crate) [c::cc_t; c::NCCS as usize]);
+
+impl core::ops::Index<SpecialCodeIndex> for SpecialCodes {
+    type Output = c::cc_t;
+
+    fn index(&self, index: SpecialCodeIndex) -> &Self::Output {
+        &self.0[index.0]
+    }
+}
+
+impl core::ops::IndexMut<SpecialCodeIndex> for SpecialCodes {
+    fn index_mut(&mut self, index: SpecialCodeIndex) -> &mut Self::Output {
+        &mut self.0[index.0]
+    }
+}
+
+/// Indices for use with [`Termios::special_codes`].
+pub struct SpecialCodeIndex(usize);
+
+#[rustfmt::skip]
+impl SpecialCodeIndex {
+    /// `VINTR`
+    pub const VINTR: Self = Self(c::VINTR as usize);
+
+    /// `VQUIT`
+    pub const VQUIT: Self = Self(c::VQUIT as usize);
+
+    /// `VERASE`
+    pub const VERASE: Self = Self(c::VERASE as usize);
+
+    /// `VKILL`
+    pub const VKILL: Self = Self(c::VKILL as usize);
+
+    /// `VEOF`
+    pub const VEOF: Self = Self(c::VEOF as usize);
+
+    /// `VTIME`
+    pub const VTIME: Self = Self(c::VTIME as usize);
+
+    /// `VMIN`
+    pub const VMIN: Self = Self(c::VMIN as usize);
+
+    /// `VSWTC`
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        target_os = "aix",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "nto",
+    )))]
+    pub const VSWTC: Self = Self(c::VSWTC as usize);
+
+    /// `VSTART`
+    pub const VSTART: Self = Self(c::VSTART as usize);
+
+    /// `VSTOP`
+    pub const VSTOP: Self = Self(c::VSTOP as usize);
+
+    /// `VSUSP`
+    pub const VSUSP: Self = Self(c::VSUSP as usize);
+
+    /// `VEOL`
+    pub const VEOL: Self = Self(c::VEOL as usize);
+
+    /// `VREPRINT`
+    #[cfg(not(target_os = "haiku"))]
+    pub const VREPRINT: Self = Self(c::VREPRINT as usize);
+
+    /// `VDISCARD`
+    #[cfg(not(any(target_os = "aix", target_os = "haiku")))]
+    pub const VDISCARD: Self = Self(c::VDISCARD as usize);
+
+    /// `VWERASE`
+    #[cfg(not(any(target_os = "aix", target_os = "haiku")))]
+    pub const VWERASE: Self = Self(c::VWERASE as usize);
+
+    /// `VLNEXT`
+    #[cfg(not(target_os = "haiku"))]
+    pub const VLNEXT: Self = Self(c::VLNEXT as usize);
+
+    /// `VEOL2`
+    pub const VEOL2: Self = Self(c::VEOL2 as usize);
+}
+
+/// `TCSA*` values for use with [`tcsetattr`].
+///
+/// [`tcsetattr`]: crate::termios::tcsetattr
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
+#[repr(u32)]
+pub enum OptionalActions {
+    /// `TCSANOW`—Make the change immediately.
+    #[doc(alias = "TCSANOW")]
+    Now = c::TCSANOW as u32,
+
+    /// `TCSADRAIN`—Make the change after all output has been transmitted.
+    #[doc(alias = "TCSADRAIN")]
+    Drain = c::TCSADRAIN as u32,
+
+    /// `TCSAFLUSH`—Discard any pending input and then make the change
+    /// after all output has been transmitted.
+    #[doc(alias = "TCSAFLUSH")]
+    Flush = c::TCSAFLUSH as u32,
+}
+
+/// `TC*` values for use with [`tcflush`].
+///
+/// [`tcflush`]: crate::termios::tcflush
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
+#[repr(u32)]
+pub enum QueueSelector {
+    /// `TCIFLUSH`—Flush data received but not read.
+    #[doc(alias = "TCIFLUSH")]
+    IFlush = c::TCIFLUSH as u32,
+
+    /// `TCOFLUSH`—Flush data written but not transmitted.
+    #[doc(alias = "TCOFLUSH")]
+    OFlush = c::TCOFLUSH as u32,
+
+    /// `TCIOFLUSH`—`IFlush` and `OFlush` combined.
+    #[doc(alias = "TCIOFLUSH")]
+    IOFlush = c::TCIOFLUSH as u32,
+}
+
+/// `TC*` values for use with [`tcflow`].
+///
+/// [`tcflow`]: crate::termios::tcflow
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
+#[repr(u32)]
+pub enum Action {
+    /// `TCOOFF`—Suspend output.
+    #[doc(alias = "TCOOFF")]
+    OOff = c::TCOOFF as u32,
+
+    /// `TCOON`—Restart suspended output.
+    #[doc(alias = "TCOON")]
+    OOn = c::TCOON as u32,
+
+    /// `TCIOFF`—Transmits a STOP byte.
+    #[doc(alias = "TCIOFF")]
+    IOff = c::TCIOFF as u32,
+
+    /// `TCION`—Transmits a START byte.
+    #[doc(alias = "TCION")]
+    IOn = c::TCION as u32,
+}
+
+/// `struct winsize` for use with [`tcgetwinsize`].
+///
+/// [`tcgetwinsize`]: crate::termios::tcgetwinsize
+#[doc(alias = "winsize")]
+pub type Winsize = c::winsize;
+
+#[test]
+fn termios_layouts() {
+    check_renamed_type!(InputModes, tcflag_t);
+    check_renamed_type!(OutputModes, tcflag_t);
+    check_renamed_type!(ControlModes, tcflag_t);
+    check_renamed_type!(LocalModes, tcflag_t);
+
+    // On platforms with a termios/termios2 split, check `termios`.
+    #[cfg(linux_raw)]
+    {
+        check_renamed_type!(Termios, termios2);
+        check_renamed_struct_renamed_field!(Termios, termios2, input_modes, c_iflag);
+        check_renamed_struct_renamed_field!(Termios, termios2, output_modes, c_oflag);
+        check_renamed_struct_renamed_field!(Termios, termios2, control_modes, c_cflag);
+        check_renamed_struct_renamed_field!(Termios, termios2, local_modes, c_lflag);
+        check_renamed_struct_renamed_field!(Termios, termios2, line_discipline, c_line);
+        check_renamed_struct_renamed_field!(Termios, termios2, special_codes, c_cc);
+        check_renamed_struct_renamed_field!(Termios, termios2, input_speed, c_ispeed);
+        check_renamed_struct_renamed_field!(Termios, termios2, output_speed, c_ospeed);
+
+        // We assume that `termios` has the same layout as `termios2` minus the
+        // `c_ispeed` and `c_ospeed` fields.
+        check_renamed_struct_renamed_field!(Termios, termios, input_modes, c_iflag);
+        check_renamed_struct_renamed_field!(Termios, termios, output_modes, c_oflag);
+        check_renamed_struct_renamed_field!(Termios, termios, control_modes, c_cflag);
+        check_renamed_struct_renamed_field!(Termios, termios, local_modes, c_lflag);
+        check_renamed_struct_renamed_field!(Termios, termios, special_codes, c_cc);
+
+        // On everything except PowerPC, `termios` matches `termios2` except
+        // for the addition of `c_ispeed` and `c_ospeed`.
+        #[cfg(not(any(target_arch = "powerpc", target_arch = "powerpc64")))]
+        const_assert_eq!(
+            memoffset::offset_of!(Termios, input_speed),
+            core::mem::size_of::<c::termios>()
+        );
+
+        // On PowerPC, `termios2` is `termios`.
+        #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
+        assert_eq_size!(c::termios2, c::termios);
+    }
+
+    #[cfg(not(linux_raw))]
+    {
+        // On Mips, Sparc, and Android, the libc lacks the ospeed and ispeed
+        // fields.
+        #[cfg(all(
+            not(all(
+                target_env = "gnu",
+                any(
+                    target_arch = "mips",
+                    target_arch = "mips32r6",
+                    target_arch = "mips64",
+                    target_arch = "mips64r6",
+                    target_arch = "sparc",
+                    target_arch = "sparc64"
+                )
+            )),
+            not(all(libc, target_os = "android"))
+        ))]
+        check_renamed_type!(Termios, termios);
+        #[cfg(not(all(
+            not(all(
+                target_env = "gnu",
+                any(
+                    target_arch = "mips",
+                    target_arch = "mips32r6",
+                    target_arch = "mips64",
+                    target_arch = "mips64r6",
+                    target_arch = "sparc",
+                    target_arch = "sparc64"
+                )
+            )),
+            not(all(libc, target_os = "android"))
+        )))]
+        const_assert!(core::mem::size_of::<Termios>() >= core::mem::size_of::<c::termios>());
+
+        check_renamed_struct_renamed_field!(Termios, termios, input_modes, c_iflag);
+        check_renamed_struct_renamed_field!(Termios, termios, output_modes, c_oflag);
+        check_renamed_struct_renamed_field!(Termios, termios, control_modes, c_cflag);
+        check_renamed_struct_renamed_field!(Termios, termios, local_modes, c_lflag);
+        #[cfg(any(
+            linux_like,
+            target_env = "newlib",
+            target_os = "fuchsia",
+            target_os = "haiku",
+            target_os = "redox"
+        ))]
+        check_renamed_struct_renamed_field!(Termios, termios, line_discipline, c_line);
+        check_renamed_struct_renamed_field!(Termios, termios, special_codes, c_cc);
+        #[cfg(not(any(
+            linux_kernel,
+            solarish,
+            target_os = "emscripten",
+            target_os = "fuchsia"
+        )))]
+        {
+            check_renamed_struct_renamed_field!(Termios, termios, input_speed, c_ispeed);
+            check_renamed_struct_renamed_field!(Termios, termios, output_speed, c_ospeed);
+        }
+        #[cfg(any(target_env = "musl", target_os = "fuchsia"))]
+        {
+            check_renamed_struct_renamed_field!(Termios, termios, input_speed, __c_ispeed);
+            check_renamed_struct_renamed_field!(Termios, termios, output_speed, __c_ospeed);
+        }
+    }
+
+    check_renamed_type!(OptionalActions, c_int);
+    check_renamed_type!(QueueSelector, c_int);
+    check_renamed_type!(Action, c_int);
+}
+
+#[test]
+#[cfg(not(any(
+    solarish,
+    target_os = "emscripten",
+    target_os = "haiku",
+    target_os = "redox"
+)))]
+fn termios_legacy() {
+    // Check that our doc aliases above are correct.
+    const_assert_eq!(c::EXTA, c::B19200);
+    const_assert_eq!(c::EXTB, c::B38400);
+}
+
+#[cfg(bsd)]
+#[test]
+fn termios_bsd() {
+    // On BSD platforms we can assume that the `B*` constants have their
+    // arbitrary integer speed value. Confirm this.
+    const_assert_eq!(c::B0, 0);
+    const_assert_eq!(c::B50, 50);
+    const_assert_eq!(c::B19200, 19200);
+    const_assert_eq!(c::B38400, 38400);
+}
+
+#[test]
+#[cfg(not(bsd))]
+fn termios_speed_encoding() {
+    assert_eq!(speed::encode(0), Some(c::B0));
+    assert_eq!(speed::encode(50), Some(c::B50));
+    assert_eq!(speed::encode(19200), Some(c::B19200));
+    assert_eq!(speed::encode(38400), Some(c::B38400));
+    assert_eq!(speed::encode(1), None);
+    assert_eq!(speed::encode(!0), None);
+
+    #[cfg(not(linux_kernel))]
+    {
+        assert_eq!(speed::decode(c::B0), Some(0));
+        assert_eq!(speed::decode(c::B50), Some(50));
+        assert_eq!(speed::decode(c::B19200), Some(19200));
+        assert_eq!(speed::decode(c::B38400), Some(38400));
+    }
+}
+
+#[cfg(linux_kernel)]
+#[test]
+fn termios_ioctl_contiguity() {
+    // When using `termios2`, we assume that we can add the optional actions
+    // value to the ioctl request code. Test this assumption.
+
+    const_assert_eq!(c::TCSETS2, c::TCSETS2 + 0);
+    const_assert_eq!(c::TCSETSW2, c::TCSETS2 + 1);
+    const_assert_eq!(c::TCSETSF2, c::TCSETS2 + 2);
+
+    const_assert_eq!(c::TCSANOW - c::TCSANOW, 0);
+    const_assert_eq!(c::TCSADRAIN - c::TCSANOW, 1);
+    const_assert_eq!(c::TCSAFLUSH - c::TCSANOW, 2);
+
+    // MIPS is different here.
+    #[cfg(any(
+        target_arch = "mips",
+        target_arch = "mips32r6",
+        target_arch = "mips64",
+        target_arch = "mips64r6"
+    ))]
+    {
+        assert_eq!(i128::from(c::TCSANOW) - i128::from(c::TCSETS), 0);
+        assert_eq!(i128::from(c::TCSADRAIN) - i128::from(c::TCSETS), 1);
+        assert_eq!(i128::from(c::TCSAFLUSH) - i128::from(c::TCSETS), 2);
+    }
+    #[cfg(not(any(
+        target_arch = "mips",
+        target_arch = "mips32r6",
+        target_arch = "mips64",
+        target_arch = "mips64r6"
+    )))]
+    {
+        const_assert_eq!(c::TCSANOW, 0);
+        const_assert_eq!(c::TCSADRAIN, 1);
+        const_assert_eq!(c::TCSAFLUSH, 2);
+    }
+}
+
+#[cfg(linux_kernel)]
+#[test]
+fn termios_cibaud() {
+    // Test an assumption.
+    const_assert_eq!(c::CIBAUD, c::CBAUD << c::IBSHIFT);
+}
diff --git a/vendor/rustix/src/thread/clock.rs b/vendor/rustix/src/thread/clock.rs
new file mode 100644
index 0000000..986e1f9
--- /dev/null
+++ b/vendor/rustix/src/thread/clock.rs
@@ -0,0 +1,100 @@
+use crate::{backend, io};
+
+pub use crate::timespec::Timespec;
+
+#[cfg(not(any(
+    apple,
+    target_os = "dragonfly",
+    target_os = "espidf",
+    target_os = "freebsd", // FreeBSD 12 has clock_nanosleep, but libc targets FreeBSD 11.
+    target_os = "openbsd",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+pub use crate::clockid::ClockId;
+
+/// `clock_nanosleep(id, 0, request, remain)`—Sleeps for a duration on a
+/// given clock.
+///
+/// This is `clock_nanosleep` specialized for the case of a relative sleep
+/// interval. See [`clock_nanosleep_absolute`] for absolute intervals.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_nanosleep.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/clock_nanosleep.2.html
+#[cfg(not(any(
+    apple,
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "freebsd", // FreeBSD 12 has clock_nanosleep, but libc targets FreeBSD 11.
+    target_os = "haiku",
+    target_os = "openbsd",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+#[inline]
+pub fn clock_nanosleep_relative(id: ClockId, request: &Timespec) -> NanosleepRelativeResult {
+    backend::thread::syscalls::clock_nanosleep_relative(id, request)
+}
+
+/// `clock_nanosleep(id, TIMER_ABSTIME, request, NULL)`—Sleeps until an
+/// absolute time on a given clock.
+///
+/// This is `clock_nanosleep` specialized for the case of an absolute sleep
+/// interval. See [`clock_nanosleep_relative`] for relative intervals.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_nanosleep.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/clock_nanosleep.2.html
+#[cfg(not(any(
+    apple,
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "freebsd", // FreeBSD 12 has clock_nanosleep, but libc targets FreeBSD 11.
+    target_os = "haiku",
+    target_os = "openbsd",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+#[inline]
+pub fn clock_nanosleep_absolute(id: ClockId, request: &Timespec) -> io::Result<()> {
+    backend::thread::syscalls::clock_nanosleep_absolute(id, request)
+}
+
+/// `nanosleep(request, remain)`—Sleeps for a duration.
+///
+/// This effectively uses the system monotonic clock.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/nanosleep.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/nanosleep.2.html
+#[inline]
+pub fn nanosleep(request: &Timespec) -> NanosleepRelativeResult {
+    backend::thread::syscalls::nanosleep(request)
+}
+
+/// A return type for `nanosleep` and `clock_nanosleep_relative`.
+#[derive(Debug, Clone)]
+#[must_use]
+pub enum NanosleepRelativeResult {
+    /// The sleep completed normally.
+    Ok,
+    /// The sleep was interrupted, the remaining time is returned.
+    Interrupted(Timespec),
+    /// An invalid time value was provided.
+    Err(io::Errno),
+}
diff --git a/vendor/rustix/src/thread/futex.rs b/vendor/rustix/src/thread/futex.rs
new file mode 100644
index 0000000..47947c8
--- /dev/null
+++ b/vendor/rustix/src/thread/futex.rs
@@ -0,0 +1,38 @@
+//! Linux `futex`.
+//!
+//! # Safety
+//!
+//! Futex is a very low-level mechanism for implementing concurrency
+//! primitives.
+#![allow(unsafe_code)]
+
+use crate::thread::Timespec;
+use crate::{backend, io};
+
+pub use backend::thread::futex::{FutexFlags, FutexOperation};
+
+/// `futex(uaddr, op, val, utime, uaddr2, val3)`
+///
+/// # References
+///  - [Linux `futex` system call]
+///  - [Linux `futex` feature]
+///
+/// # Safety
+///
+/// This is a very low-level feature for implementing synchronization
+/// primitives. See the references links above.
+///
+/// [Linux `futex` system call]: https://man7.org/linux/man-pages/man2/futex.2.html
+/// [Linux `futex` feature]: https://man7.org/linux/man-pages/man7/futex.7.html
+#[inline]
+pub unsafe fn futex(
+    uaddr: *mut u32,
+    op: FutexOperation,
+    flags: FutexFlags,
+    val: u32,
+    utime: *const Timespec,
+    uaddr2: *mut u32,
+    val3: u32,
+) -> io::Result<usize> {
+    backend::thread::syscalls::futex(uaddr, op, flags, val, utime, uaddr2, val3)
+}
diff --git a/vendor/rustix/src/thread/id.rs b/vendor/rustix/src/thread/id.rs
new file mode 100644
index 0000000..11193c9
--- /dev/null
+++ b/vendor/rustix/src/thread/id.rs
@@ -0,0 +1,115 @@
+use crate::{backend, io};
+
+pub use crate::pid::{Pid, RawPid};
+pub use crate::ugid::{Gid, RawGid, RawUid, Uid};
+
+/// `gettid()`—Returns the thread ID.
+///
+/// This returns the OS thread ID, which is not necessarily the same as the
+/// `rust::thread::Thread::id` or the pthread ID.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/gettid.2.html
+#[inline]
+#[must_use]
+pub fn gettid() -> Pid {
+    backend::thread::syscalls::gettid()
+}
+
+/// `setuid(uid)`
+///
+/// # Warning
+///
+/// This is not the setxid you are looking for… POSIX requires xids to be
+/// process granular, but on Linux they are per-thread. Thus, this call only
+/// changes the xid for the current *thread*, not the entire process even
+/// though that is in violation of the POSIX standard.
+///
+/// For details on this distinction, see the C library vs. kernel differences
+/// in the [manual page][linux_notes]. This call implements the kernel
+/// behavior.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setuid.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/setuid.2.html
+/// [linux_notes]: https://man7.org/linux/man-pages/man2/setuid.2.html#NOTES
+#[inline]
+pub fn set_thread_uid(uid: Uid) -> io::Result<()> {
+    backend::thread::syscalls::setuid_thread(uid)
+}
+
+/// `setresuid(ruid, euid, suid)`
+///
+/// # Warning
+///
+/// This is not the setresxid you are looking for… POSIX requires xids to be
+/// process granular, but on Linux they are per-thread. Thus, this call only
+/// changes the xid for the current *thread*, not the entire process even
+/// though that is in violation of the POSIX standard.
+///
+/// For details on this distinction, see the C library vs. kernel differences
+/// in the [manual page][linux_notes] and the notes in [`set_thread_uid`]. This
+/// call implements the kernel behavior.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/setresuid.2.html
+/// [linux_notes]: https://man7.org/linux/man-pages/man2/setresuid.2.html#NOTES
+#[inline]
+pub fn set_thread_res_uid(ruid: Uid, euid: Uid, suid: Uid) -> io::Result<()> {
+    backend::thread::syscalls::setresuid_thread(ruid, euid, suid)
+}
+
+/// `setgid(gid)`
+///
+/// # Warning
+///
+/// This is not the setxid you are looking for… POSIX requires xids to be
+/// process granular, but on Linux they are per-thread. Thus, this call only
+/// changes the xid for the current *thread*, not the entire process even
+/// though that is in violation of the POSIX standard.
+///
+/// For details on this distinction, see the C library vs. kernel differences
+/// in the [manual page][linux_notes]. This call implements the kernel
+/// behavior.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setgid.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/setgid.2.html
+/// [linux_notes]: https://man7.org/linux/man-pages/man2/setgid.2.html#NOTES
+#[inline]
+pub fn set_thread_gid(gid: Gid) -> io::Result<()> {
+    backend::thread::syscalls::setgid_thread(gid)
+}
+
+/// `setresgid(rgid, egid, sgid)`
+///
+/// # Warning
+///
+/// This is not the setresxid you are looking for… POSIX requires xids to be
+/// process granular, but on Linux they are per-thread. Thus, this call only
+/// changes the xid for the current *thread*, not the entire process even
+/// though that is in violation of the POSIX standard.
+///
+/// For details on this distinction, see the C library vs. kernel differences
+/// in the [manual page][linux_notes] and the notes in [`set_thread_gid`]. This
+/// call implements the kernel behavior.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/setresgid.2.html
+/// [linux_notes]: https://man7.org/linux/man-pages/man2/setresgid.2.html#NOTES
+#[inline]
+pub fn set_thread_res_gid(rgid: Gid, egid: Gid, sgid: Gid) -> io::Result<()> {
+    backend::thread::syscalls::setresgid_thread(rgid, egid, sgid)
+}
diff --git a/vendor/rustix/src/thread/libcap.rs b/vendor/rustix/src/thread/libcap.rs
new file mode 100644
index 0000000..0a0fbb4
--- /dev/null
+++ b/vendor/rustix/src/thread/libcap.rs
@@ -0,0 +1,185 @@
+use bitflags::bitflags;
+use core::mem::MaybeUninit;
+
+use crate::pid::Pid;
+use crate::{backend, io};
+
+/// `__user_cap_data_struct`
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct CapabilitySets {
+    /// `__user_cap_data_struct.effective`
+    pub effective: CapabilityFlags,
+    /// `__user_cap_data_struct.permitted`
+    pub permitted: CapabilityFlags,
+    /// `__user_cap_data_struct.inheritable`
+    pub inheritable: CapabilityFlags,
+}
+
+bitflags! {
+    /// `CAP_*` constants.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct CapabilityFlags: u64 {
+        /// `CAP_CHOWN`
+        const CHOWN = 1 << linux_raw_sys::general::CAP_CHOWN;
+        /// `CAP_DAC_OVERRIDE`
+        const DAC_OVERRIDE = 1 << linux_raw_sys::general::CAP_DAC_OVERRIDE;
+        /// `CAP_DAC_READ_SEARCH`
+        const DAC_READ_SEARCH = 1 << linux_raw_sys::general::CAP_DAC_READ_SEARCH;
+        /// `CAP_FOWNER`
+        const FOWNER = 1 << linux_raw_sys::general::CAP_FOWNER;
+        /// `CAP_FSETID`
+        const FSETID = 1 << linux_raw_sys::general::CAP_FSETID;
+        /// `CAP_KILL`
+        const KILL = 1 << linux_raw_sys::general::CAP_KILL;
+        /// `CAP_SETGID`
+        const SETGID = 1 << linux_raw_sys::general::CAP_SETGID;
+        /// `CAP_SETUID`
+        const SETUID = 1 << linux_raw_sys::general::CAP_SETUID;
+        /// `CAP_SETPCAP`
+        const SETPCAP = 1 << linux_raw_sys::general::CAP_SETPCAP;
+        /// `CAP_LINUX_IMMUTABLE`
+        const LINUX_IMMUTABLE = 1 << linux_raw_sys::general::CAP_LINUX_IMMUTABLE;
+        /// `CAP_NET_BIND_SERVICE`
+        const NET_BIND_SERVICE = 1 << linux_raw_sys::general::CAP_NET_BIND_SERVICE;
+        /// `CAP_NET_BROADCAST`
+        const NET_BROADCAST = 1 << linux_raw_sys::general::CAP_NET_BROADCAST;
+        /// `CAP_NET_ADMIN`
+        const NET_ADMIN = 1 << linux_raw_sys::general::CAP_NET_ADMIN;
+        /// `CAP_NET_RAW`
+        const NET_RAW = 1 << linux_raw_sys::general::CAP_NET_RAW;
+        /// `CAP_IPC_LOCK`
+        const IPC_LOCK = 1 << linux_raw_sys::general::CAP_IPC_LOCK;
+        /// `CAP_IPC_OWNER`
+        const IPC_OWNER = 1 << linux_raw_sys::general::CAP_IPC_OWNER;
+        /// `CAP_SYS_MODULE`
+        const SYS_MODULE = 1 << linux_raw_sys::general::CAP_SYS_MODULE;
+        /// `CAP_SYS_RAWIO`
+        const SYS_RAWIO = 1 << linux_raw_sys::general::CAP_SYS_RAWIO;
+        /// `CAP_SYS_CHROOT`
+        const SYS_CHROOT = 1 << linux_raw_sys::general::CAP_SYS_CHROOT;
+        /// `CAP_SYS_PTRACE`
+        const SYS_PTRACE = 1 << linux_raw_sys::general::CAP_SYS_PTRACE;
+        /// `CAP_SYS_PACCT`
+        const SYS_PACCT = 1 << linux_raw_sys::general::CAP_SYS_PACCT;
+        /// `CAP_SYS_ADMIN`
+        const SYS_ADMIN = 1 << linux_raw_sys::general::CAP_SYS_ADMIN;
+        /// `CAP_SYS_BOOT`
+        const SYS_BOOT = 1 << linux_raw_sys::general::CAP_SYS_BOOT;
+        /// `CAP_SYS_NICE`
+        const SYS_NICE = 1 << linux_raw_sys::general::CAP_SYS_NICE;
+        /// `CAP_SYS_RESOURCE`
+        const SYS_RESOURCE = 1 << linux_raw_sys::general::CAP_SYS_RESOURCE;
+        /// `CAP_SYS_TIME`
+        const SYS_TIME = 1 << linux_raw_sys::general::CAP_SYS_TIME;
+        /// `CAP_SYS_TTY_CONFIG`
+        const SYS_TTY_CONFIG = 1 << linux_raw_sys::general::CAP_SYS_TTY_CONFIG;
+        /// `CAP_MKNOD`
+        const MKNOD = 1 << linux_raw_sys::general::CAP_MKNOD;
+        /// `CAP_LEASE`
+        const LEASE = 1 << linux_raw_sys::general::CAP_LEASE;
+        /// `CAP_AUDIT_WRITE`
+        const AUDIT_WRITE = 1 << linux_raw_sys::general::CAP_AUDIT_WRITE;
+        /// `CAP_AUDIT_CONTROL`
+        const AUDIT_CONTROL = 1 << linux_raw_sys::general::CAP_AUDIT_CONTROL;
+        /// `CAP_SETFCAP`
+        const SETFCAP = 1 << linux_raw_sys::general::CAP_SETFCAP;
+        /// `CAP_MAC_OVERRIDE`
+        const MAC_OVERRIDE = 1 << linux_raw_sys::general::CAP_MAC_OVERRIDE;
+        /// `CAP_MAC_ADMIN`
+        const MAC_ADMIN = 1 << linux_raw_sys::general::CAP_MAC_ADMIN;
+        /// `CAP_SYSLOG`
+        const SYSLOG = 1 << linux_raw_sys::general::CAP_SYSLOG;
+        /// `CAP_WAKE_ALARM`
+        const WAKE_ALARM = 1 << linux_raw_sys::general::CAP_WAKE_ALARM;
+        /// `CAP_BLOCK_SUSPEND`
+        const BLOCK_SUSPEND = 1 << linux_raw_sys::general::CAP_BLOCK_SUSPEND;
+        /// `CAP_AUDIT_READ`
+        const AUDIT_READ = 1 << linux_raw_sys::general::CAP_AUDIT_READ;
+        /// `CAP_PERFMON`
+        const PERFMON = 1 << linux_raw_sys::general::CAP_PERFMON;
+        /// `CAP_BPF`
+        const BPF = 1 << linux_raw_sys::general::CAP_BPF;
+        /// `CAP_CHECKPOINT_RESTORE`
+        const CHECKPOINT_RESTORE = 1 << linux_raw_sys::general::CAP_CHECKPOINT_RESTORE;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// `capget(_LINUX_CAPABILITY_VERSION_3, pid)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/capget.2.html
+#[inline]
+#[doc(alias = "capget")]
+pub fn capabilities(pid: Option<Pid>) -> io::Result<CapabilitySets> {
+    capget(pid)
+}
+
+/// `capset(_LINUX_CAPABILITY_VERSION_3, pid, effective, permitted,
+/// inheritable)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/capget.2.html
+#[inline]
+#[doc(alias = "capset")]
+pub fn set_capabilities(pid: Option<Pid>, sets: CapabilitySets) -> io::Result<()> {
+    capset(pid, sets)
+}
+
+#[inline]
+#[allow(unsafe_code)]
+fn capget(pid: Option<Pid>) -> io::Result<CapabilitySets> {
+    let mut data = [MaybeUninit::<linux_raw_sys::general::__user_cap_data_struct>::uninit(); 2];
+
+    let data = {
+        let mut header = linux_raw_sys::general::__user_cap_header_struct {
+            version: linux_raw_sys::general::_LINUX_CAPABILITY_VERSION_3,
+            pid: Pid::as_raw(pid) as backend::c::c_int,
+        };
+
+        backend::thread::syscalls::capget(&mut header, &mut data)?;
+        // SAFETY: v3 is a 64-bit implementation, so the kernel filled in both
+        // data structs.
+        unsafe { (data[0].assume_init(), data[1].assume_init()) }
+    };
+
+    let effective = u64::from(data.0.effective) | (u64::from(data.1.effective) << u32::BITS);
+    let permitted = u64::from(data.0.permitted) | (u64::from(data.1.permitted) << u32::BITS);
+    let inheritable = u64::from(data.0.inheritable) | (u64::from(data.1.inheritable) << u32::BITS);
+
+    // The kernel returns a partitioned bitset that we just combined above.
+    Ok(CapabilitySets {
+        effective: CapabilityFlags::from_bits_retain(effective),
+        permitted: CapabilityFlags::from_bits_retain(permitted),
+        inheritable: CapabilityFlags::from_bits_retain(inheritable),
+    })
+}
+
+#[inline]
+fn capset(pid: Option<Pid>, sets: CapabilitySets) -> io::Result<()> {
+    let mut header = linux_raw_sys::general::__user_cap_header_struct {
+        version: linux_raw_sys::general::_LINUX_CAPABILITY_VERSION_3,
+        pid: Pid::as_raw(pid) as backend::c::c_int,
+    };
+    let data = [
+        linux_raw_sys::general::__user_cap_data_struct {
+            effective: sets.effective.bits() as u32,
+            permitted: sets.permitted.bits() as u32,
+            inheritable: sets.inheritable.bits() as u32,
+        },
+        linux_raw_sys::general::__user_cap_data_struct {
+            effective: (sets.effective.bits() >> u32::BITS) as u32,
+            permitted: (sets.permitted.bits() >> u32::BITS) as u32,
+            inheritable: (sets.inheritable.bits() >> u32::BITS) as u32,
+        },
+    ];
+
+    backend::thread::syscalls::capset(&mut header, &data)
+}
diff --git a/vendor/rustix/src/thread/mod.rs b/vendor/rustix/src/thread/mod.rs
new file mode 100644
index 0000000..6f19635
--- /dev/null
+++ b/vendor/rustix/src/thread/mod.rs
@@ -0,0 +1,30 @@
+//! Thread-associated operations.
+
+#[cfg(not(target_os = "redox"))]
+mod clock;
+#[cfg(linux_kernel)]
+mod futex;
+#[cfg(linux_kernel)]
+mod id;
+#[cfg(linux_kernel)]
+mod libcap;
+#[cfg(linux_kernel)]
+mod prctl;
+#[cfg(linux_kernel)]
+mod setns;
+
+#[cfg(not(target_os = "redox"))]
+pub use clock::*;
+#[cfg(linux_kernel)]
+pub use futex::{futex, FutexFlags, FutexOperation};
+#[cfg(linux_kernel)]
+pub use id::{
+    gettid, set_thread_gid, set_thread_res_gid, set_thread_res_uid, set_thread_uid, Gid, Pid,
+    RawGid, RawPid, RawUid, Uid,
+};
+#[cfg(linux_kernel)]
+pub use libcap::{capabilities, set_capabilities, CapabilityFlags, CapabilitySets};
+#[cfg(linux_kernel)]
+pub use prctl::*;
+#[cfg(linux_kernel)]
+pub use setns::*;
diff --git a/vendor/rustix/src/thread/prctl.rs b/vendor/rustix/src/thread/prctl.rs
new file mode 100644
index 0000000..9d9e6b2
--- /dev/null
+++ b/vendor/rustix/src/thread/prctl.rs
@@ -0,0 +1,1007 @@
+//! Linux `prctl` wrappers.
+//!
+//! Rustix wraps variadic/dynamic-dispatch functions like `prctl` in
+//! type-safe wrappers.
+//!
+//! # Safety
+//!
+//! The inner `prctl` calls are dynamically typed and must be called
+//! correctly.
+#![allow(unsafe_code)]
+
+use core::mem::MaybeUninit;
+use core::num::NonZeroU64;
+use core::ptr;
+use core::ptr::NonNull;
+use core::sync::atomic::AtomicU8;
+
+use bitflags::bitflags;
+
+use crate::backend::c::{c_int, c_uint, c_void};
+use crate::backend::prctl::syscalls;
+use crate::ffi::CStr;
+#[cfg(feature = "alloc")]
+use crate::ffi::CString;
+use crate::io;
+use crate::pid::Pid;
+use crate::prctl::{
+    prctl_1arg, prctl_2args, prctl_3args, prctl_get_at_arg2_optional, PointerAuthenticationKeys,
+};
+use crate::utils::as_ptr;
+
+//
+// PR_GET_KEEPCAPS/PR_SET_KEEPCAPS
+//
+
+const PR_GET_KEEPCAPS: c_int = 7;
+
+/// Get the current state of the calling thread's `keep capabilities` flag.
+///
+/// # References
+///  - [`prctl(PR_GET_KEEPCAPS,...)`]
+///
+/// [`prctl(PR_GET_KEEPCAPS,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn get_keep_capabilities() -> io::Result<bool> {
+    unsafe { prctl_1arg(PR_GET_KEEPCAPS) }.map(|r| r != 0)
+}
+
+const PR_SET_KEEPCAPS: c_int = 8;
+
+/// Set the state of the calling thread's `keep capabilities` flag.
+///
+/// # References
+///  - [`prctl(PR_SET_KEEPCAPS,...)`]
+///
+/// [`prctl(PR_SET_KEEPCAPS,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn set_keep_capabilities(enable: bool) -> io::Result<()> {
+    unsafe { prctl_2args(PR_SET_KEEPCAPS, usize::from(enable) as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_GET_NAME/PR_SET_NAME
+//
+
+#[cfg(feature = "alloc")]
+const PR_GET_NAME: c_int = 16;
+
+/// Get the name of the calling thread.
+///
+/// # References
+///  - [`prctl(PR_GET_NAME,...)`]
+///
+/// [`prctl(PR_GET_NAME,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+#[cfg(feature = "alloc")]
+pub fn name() -> io::Result<CString> {
+    let mut buffer = [0_u8; 16];
+    unsafe { prctl_2args(PR_GET_NAME, buffer.as_mut_ptr().cast())? };
+
+    let len = buffer.iter().position(|&x| x == 0_u8).unwrap_or(0);
+    CString::new(&buffer[..len]).map_err(|_r| io::Errno::ILSEQ)
+}
+
+const PR_SET_NAME: c_int = 15;
+
+/// Set the name of the calling thread.
+///
+/// Unlike `pthread_setname_np`, this function silently truncates the name to
+/// 16 bytes, as the Linux syscall does.
+///
+/// # References
+///  - [`prctl(PR_SET_NAME,...)`]
+///
+/// [`prctl(PR_SET_NAME,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn set_name(name: &CStr) -> io::Result<()> {
+    unsafe { prctl_2args(PR_SET_NAME, name.as_ptr() as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_GET_SECCOMP/PR_SET_SECCOMP
+//
+
+//const PR_GET_SECCOMP: c_int = 21;
+
+const SECCOMP_MODE_DISABLED: i32 = 0;
+const SECCOMP_MODE_STRICT: i32 = 1;
+const SECCOMP_MODE_FILTER: i32 = 2;
+
+/// `SECCOMP_MODE_*`.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(i32)]
+pub enum SecureComputingMode {
+    /// Secure computing is not in use.
+    Disabled = SECCOMP_MODE_DISABLED,
+    /// Use hard-coded filter.
+    Strict = SECCOMP_MODE_STRICT,
+    /// Use user-supplied filter.
+    Filter = SECCOMP_MODE_FILTER,
+}
+
+impl TryFrom<i32> for SecureComputingMode {
+    type Error = io::Errno;
+
+    fn try_from(value: i32) -> Result<Self, Self::Error> {
+        match value {
+            SECCOMP_MODE_DISABLED => Ok(Self::Disabled),
+            SECCOMP_MODE_STRICT => Ok(Self::Strict),
+            SECCOMP_MODE_FILTER => Ok(Self::Filter),
+            _ => Err(io::Errno::RANGE),
+        }
+    }
+}
+
+/*
+/// Get the secure computing mode of the calling thread.
+///
+/// If the caller is not in secure computing mode, this returns
+/// [`SecureComputingMode::Disabled`]. If the caller is in strict secure
+/// computing mode, then this call will cause a [`Signal::Kill`] signal to be
+/// sent to the process. If the caller is in filter mode, and this system call
+/// is allowed by the seccomp filters, it returns
+/// [`SecureComputingMode::Filter`]; otherwise, the process is killed with a
+/// [`Signal::Kill`] signal.
+///
+/// Since Linux 3.8, the Seccomp field of the `/proc/[pid]/status` file
+/// provides a method of obtaining the same information, without the risk that
+/// the process is killed; see [the `proc` manual page].
+///
+/// # References
+///  - [`prctl(PR_GET_SECCOMP,...)`]
+///
+/// [`prctl(PR_GET_SECCOMP,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+/// [the `proc` manual page]: https://man7.org/linux/man-pages/man5/proc.5.html
+#[inline]
+pub fn secure_computing_mode() -> io::Result<SecureComputingMode> {
+    unsafe { prctl_1arg(PR_GET_SECCOMP) }.and_then(TryInto::try_into)
+}
+*/
+
+const PR_SET_SECCOMP: c_int = 22;
+
+/// Set the secure computing mode for the calling thread, to limit the
+/// available system calls.
+///
+/// # References
+///  - [`prctl(PR_SET_SECCOMP,...)`]
+///
+/// [`prctl(PR_SET_SECCOMP,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn set_secure_computing_mode(mode: SecureComputingMode) -> io::Result<()> {
+    unsafe { prctl_2args(PR_SET_SECCOMP, mode as usize as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_CAPBSET_READ/PR_CAPBSET_DROP
+//
+
+const PR_CAPBSET_READ: c_int = 23;
+
+/// Linux per-thread capability.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(u32)]
+pub enum Capability {
+    /// In a system with the `_POSIX_CHOWN_RESTRICTED` option defined, this
+    /// overrides the restriction of changing file ownership and group
+    /// ownership.
+    ChangeOwnership = linux_raw_sys::general::CAP_CHOWN,
+    /// Override all DAC access, including ACL execute access if `_POSIX_ACL`
+    /// is defined. Excluding DAC access covered by
+    /// [`Capability::LinuxImmutable`].
+    DACOverride = linux_raw_sys::general::CAP_DAC_OVERRIDE,
+    /// Overrides all DAC restrictions regarding read and search on files and
+    /// directories, including ACL restrictions if `_POSIX_ACL` is defined.
+    /// Excluding DAC access covered by [`Capability::LinuxImmutable`].
+    DACReadSearch = linux_raw_sys::general::CAP_DAC_READ_SEARCH,
+    /// Overrides all restrictions about allowed operations on files, where
+    /// file owner ID must be equal to the user ID, except where
+    /// [`Capability::FileSetID`] is applicable. It doesn't override MAC
+    /// and DAC restrictions.
+    FileOwner = linux_raw_sys::general::CAP_FOWNER,
+    /// Overrides the following restrictions that the effective user ID shall
+    /// match the file owner ID when setting the `S_ISUID` and `S_ISGID`
+    /// bits on that file; that the effective group ID (or one of the
+    /// supplementary group IDs) shall match the file owner ID when setting the
+    /// `S_ISGID` bit on that file; that the `S_ISUID` and `S_ISGID` bits are
+    /// cleared on successful return from `chown` (not implemented).
+    FileSetID = linux_raw_sys::general::CAP_FSETID,
+    /// Overrides the restriction that the real or effective user ID of a
+    /// process sending a signal must match the real or effective user ID of
+    /// the process receiving the signal.
+    Kill = linux_raw_sys::general::CAP_KILL,
+    /// Allows `setgid` manipulation. Allows `setgroups`. Allows forged gids on
+    /// socket credentials passing.
+    SetGroupID = linux_raw_sys::general::CAP_SETGID,
+    /// Allows `set*uid` manipulation (including fsuid). Allows forged pids on
+    /// socket credentials passing.
+    SetUserID = linux_raw_sys::general::CAP_SETUID,
+    /// Without VFS support for capabilities:
+    ///  - Transfer any capability in your permitted set to any pid.
+    ///  - remove any capability in your permitted set from any pid. With VFS
+    ///    support for capabilities (neither of above, but)
+    ///  - Add any capability from current's capability bounding set to the
+    ///    current process' inheritable set.
+    ///  - Allow taking bits out of capability bounding set.
+    ///  - Allow modification of the securebits for a process.
+    SetPermittedCapabilities = linux_raw_sys::general::CAP_SETPCAP,
+    /// Allow modification of `S_IMMUTABLE` and `S_APPEND` file attributes.
+    LinuxImmutable = linux_raw_sys::general::CAP_LINUX_IMMUTABLE,
+    /// Allows binding to TCP/UDP sockets below 1024. Allows binding to ATM
+    /// VCIs below 32.
+    NetBindService = linux_raw_sys::general::CAP_NET_BIND_SERVICE,
+    /// Allow broadcasting, listen to multicast.
+    NetBroadcast = linux_raw_sys::general::CAP_NET_BROADCAST,
+    /// Allow interface configuration. Allow administration of IP firewall,
+    /// masquerading and accounting. Allow setting debug option on sockets.
+    /// Allow modification of routing tables. Allow setting arbitrary
+    /// process / process group ownership on sockets. Allow binding to any
+    /// address for transparent proxying (also via [`Capability::NetRaw`]).
+    /// Allow setting TOS (type of service). Allow setting promiscuous
+    /// mode. Allow clearing driver statistics. Allow multicasting. Allow
+    /// read/write of device-specific registers. Allow activation of ATM
+    /// control sockets.
+    NetAdmin = linux_raw_sys::general::CAP_NET_ADMIN,
+    /// Allow use of `RAW` sockets. Allow use of `PACKET` sockets. Allow
+    /// binding to any address for transparent proxying (also via
+    /// [`Capability::NetAdmin`]).
+    NetRaw = linux_raw_sys::general::CAP_NET_RAW,
+    /// Allow locking of shared memory segments. Allow mlock and mlockall
+    /// (which doesn't really have anything to do with IPC).
+    IPCLock = linux_raw_sys::general::CAP_IPC_LOCK,
+    /// Override IPC ownership checks.
+    IPCOwner = linux_raw_sys::general::CAP_IPC_OWNER,
+    /// Insert and remove kernel modules - modify kernel without limit.
+    SystemModule = linux_raw_sys::general::CAP_SYS_MODULE,
+    /// Allow ioperm/iopl access. Allow sending USB messages to any device via
+    /// `/dev/bus/usb`.
+    SystemRawIO = linux_raw_sys::general::CAP_SYS_RAWIO,
+    /// Allow use of `chroot`.
+    SystemChangeRoot = linux_raw_sys::general::CAP_SYS_CHROOT,
+    /// Allow `ptrace` of any process.
+    SystemProcessTrace = linux_raw_sys::general::CAP_SYS_PTRACE,
+    /// Allow configuration of process accounting.
+    SystemProcessAccounting = linux_raw_sys::general::CAP_SYS_PACCT,
+    /// Allow configuration of the secure attention key. Allow administration
+    /// of the random device. Allow examination and configuration of disk
+    /// quotas. Allow setting the domainname. Allow setting the hostname.
+    /// Allow `mount` and `umount`, setting up new smb connection.
+    /// Allow some autofs root ioctls. Allow nfsservctl. Allow
+    /// `VM86_REQUEST_IRQ`. Allow to read/write pci config on alpha. Allow
+    /// `irix_prctl` on mips (setstacksize). Allow flushing all cache on
+    /// m68k (`sys_cacheflush`). Allow removing semaphores. Used instead of
+    /// [`Capability::ChangeOwnership`] to "chown" IPC message queues,
+    /// semaphores and shared memory. Allow locking/unlocking of shared
+    /// memory segment. Allow turning swap on/off. Allow forged pids on
+    /// socket credentials passing. Allow setting readahead and
+    /// flushing buffers on block devices. Allow setting geometry in floppy
+    /// driver. Allow turning DMA on/off in `xd` driver. Allow
+    /// administration of md devices (mostly the above, but some
+    /// extra ioctls). Allow tuning the ide driver. Allow access to the nvram
+    /// device. Allow administration of `apm_bios`, serial and bttv (TV)
+    /// device. Allow manufacturer commands in isdn CAPI support driver.
+    /// Allow reading non-standardized portions of pci configuration space.
+    /// Allow DDI debug ioctl on sbpcd driver. Allow setting up serial ports.
+    /// Allow sending raw qic-117 commands. Allow enabling/disabling tagged
+    /// queuing on SCSI controllers and sending arbitrary SCSI commands.
+    /// Allow setting encryption key on loopback filesystem. Allow setting
+    /// zone reclaim policy. Allow everything under
+    /// [`Capability::BerkeleyPacketFilters`] and
+    /// [`Capability::PerformanceMonitoring`] for backward compatibility.
+    SystemAdmin = linux_raw_sys::general::CAP_SYS_ADMIN,
+    /// Allow use of `reboot`.
+    SystemBoot = linux_raw_sys::general::CAP_SYS_BOOT,
+    /// Allow raising priority and setting priority on other (different UID)
+    /// processes. Allow use of FIFO and round-robin (realtime) scheduling
+    /// on own processes and setting the scheduling algorithm used by
+    /// another process. Allow setting cpu affinity on other processes.
+    /// Allow setting realtime ioprio class. Allow setting ioprio class on
+    /// other processes.
+    SystemNice = linux_raw_sys::general::CAP_SYS_NICE,
+    /// Override resource limits. Set resource limits. Override quota limits.
+    /// Override reserved space on ext2 filesystem. Modify data journaling
+    /// mode on ext3 filesystem (uses journaling resources). NOTE: ext2
+    /// honors fsuid when checking for resource overrides, so you can
+    /// override using fsuid too. Override size restrictions on IPC message
+    /// queues. Allow more than 64hz interrupts from the real-time clock.
+    /// Override max number of consoles on console allocation. Override max
+    /// number of keymaps. Control memory reclaim behavior.
+    SystemResource = linux_raw_sys::general::CAP_SYS_RESOURCE,
+    /// Allow manipulation of system clock. Allow `irix_stime` on mips. Allow
+    /// setting the real-time clock.
+    SystemTime = linux_raw_sys::general::CAP_SYS_TIME,
+    /// Allow configuration of tty devices. Allow `vhangup` of tty.
+    SystemTTYConfig = linux_raw_sys::general::CAP_SYS_TTY_CONFIG,
+    /// Allow the privileged aspects of `mknod`.
+    MakeNode = linux_raw_sys::general::CAP_MKNOD,
+    /// Allow taking of leases on files.
+    Lease = linux_raw_sys::general::CAP_LEASE,
+    /// Allow writing the audit log via unicast netlink socket.
+    AuditWrite = linux_raw_sys::general::CAP_AUDIT_WRITE,
+    /// Allow configuration of audit via unicast netlink socket.
+    AuditControl = linux_raw_sys::general::CAP_AUDIT_CONTROL,
+    /// Set or remove capabilities on files. Map `uid=0` into a child user
+    /// namespace.
+    SetFileCapabilities = linux_raw_sys::general::CAP_SETFCAP,
+    /// Override MAC access. The base kernel enforces no MAC policy. An LSM may
+    /// enforce a MAC policy, and if it does and it chooses to implement
+    /// capability based overrides of that policy, this is the capability
+    /// it should use to do so.
+    MACOverride = linux_raw_sys::general::CAP_MAC_OVERRIDE,
+    /// Allow MAC configuration or state changes. The base kernel requires no
+    /// MAC configuration. An LSM may enforce a MAC policy, and if it does
+    /// and it chooses to implement capability based
+    /// checks on modifications to that policy or the data required to maintain
+    /// it, this is the capability it should use to do so.
+    MACAdmin = linux_raw_sys::general::CAP_MAC_ADMIN,
+    /// Allow configuring the kernel's `syslog` (`printk` behaviour).
+    SystemLog = linux_raw_sys::general::CAP_SYSLOG,
+    /// Allow triggering something that will wake the system.
+    WakeAlarm = linux_raw_sys::general::CAP_WAKE_ALARM,
+    /// Allow preventing system suspends.
+    BlockSuspend = linux_raw_sys::general::CAP_BLOCK_SUSPEND,
+    /// Allow reading the audit log via multicast netlink socket.
+    AuditRead = linux_raw_sys::general::CAP_AUDIT_READ,
+    /// Allow system performance and observability privileged operations using
+    /// `perf_events`, `i915_perf` and other kernel subsystems.
+    PerformanceMonitoring = linux_raw_sys::general::CAP_PERFMON,
+    /// This capability allows the following BPF operations:
+    ///  - Creating all types of BPF maps
+    ///  - Advanced verifier features
+    ///     - Indirect variable access
+    ///     - Bounded loops
+    ///     - BPF to BPF function calls
+    ///     - Scalar precision tracking
+    ///     - Larger complexity limits
+    ///     - Dead code elimination
+    ///     - And potentially other features
+    ///  - Loading BPF Type Format (BTF) data
+    ///  - Retrieve `xlated` and JITed code of BPF programs
+    ///  - Use `bpf_spin_lock` helper
+    ///
+    /// [`Capability::PerformanceMonitoring`] relaxes the verifier checks
+    /// further:
+    ///  - BPF progs can use of pointer-to-integer conversions
+    ///  - speculation attack hardening measures are bypassed
+    ///  - `bpf_probe_read` to read arbitrary kernel memory is allowed
+    ///  - `bpf_trace_printk` to print kernel memory is allowed
+    ///
+    /// [`Capability::SystemAdmin`] is required to use bpf_probe_write_user.
+    ///
+    /// [`Capability::SystemAdmin`] is required to iterate system-wide loaded
+    /// programs, maps, links, and BTFs, and convert their IDs to file
+    /// descriptors.
+    ///
+    /// [`Capability::PerformanceMonitoring`] and
+    /// [`Capability::BerkeleyPacketFilters`] are required to load tracing
+    /// programs. [`Capability::NetAdmin`] and
+    /// [`Capability::BerkeleyPacketFilters`] are required to load
+    /// networking programs.
+    BerkeleyPacketFilters = linux_raw_sys::general::CAP_BPF,
+    /// Allow checkpoint/restore related operations. Allow PID selection during
+    /// `clone3`. Allow writing to `ns_last_pid`.
+    CheckpointRestore = linux_raw_sys::general::CAP_CHECKPOINT_RESTORE,
+}
+
+/// Check if the specified capability is in the calling thread's capability
+/// bounding set.
+///
+/// # References
+///  - [`prctl(PR_CAPBSET_READ,...)`]
+///
+/// [`prctl(PR_CAPBSET_READ,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn capability_is_in_bounding_set(capability: Capability) -> io::Result<bool> {
+    unsafe { prctl_2args(PR_CAPBSET_READ, capability as usize as *mut _) }.map(|r| r != 0)
+}
+
+const PR_CAPBSET_DROP: c_int = 24;
+
+/// If the calling thread has the [`Capability::SetPermittedCapabilities`]
+/// capability within its user namespace, then drop the specified capability
+/// from the thread's capability bounding set.
+///
+/// # References
+///  - [`prctl(PR_CAPBSET_DROP,...)`]
+///
+/// [`prctl(PR_CAPBSET_DROP,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn remove_capability_from_bounding_set(capability: Capability) -> io::Result<()> {
+    unsafe { prctl_2args(PR_CAPBSET_DROP, capability as usize as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_GET_SECUREBITS/PR_SET_SECUREBITS
+//
+
+const PR_GET_SECUREBITS: c_int = 27;
+
+bitflags! {
+    /// `SECBIT_*`.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct CapabilitiesSecureBits: u32 {
+        /// If this bit is set, then the kernel does not grant capabilities
+        /// when a `set-user-ID-root` program is executed, or when a process
+        /// with an effective or real UID of 0 calls `execve`.
+        const NO_ROOT = 1_u32 << 0;
+        /// Set [`NO_ROOT`] irreversibly.
+        const NO_ROOT_LOCKED = 1_u32 << 1;
+        /// Setting this flag stops the kernel from adjusting the process'
+        /// permitted, effective, and ambient capability sets when the thread's
+        /// effective and filesystem UIDs are switched between zero and nonzero
+        /// values.
+        const NO_SETUID_FIXUP = 1_u32 << 2;
+        /// Set [`NO_SETUID_FIXUP`] irreversibly.
+        const NO_SETUID_FIXUP_LOCKED = 1_u32 << 3;
+        /// Setting this flag allows a thread that has one or more 0 UIDs to
+        /// retain capabilities in its permitted set when it switches all of
+        /// its UIDs to nonzero values.
+        const KEEP_CAPS = 1_u32 << 4;
+        /// Set [`KEEP_CAPS`] irreversibly.
+        const KEEP_CAPS_LOCKED = 1_u32 << 5;
+        /// Setting this flag disallows raising ambient capabilities via the
+        /// `prctl`'s `PR_CAP_AMBIENT_RAISE` operation.
+        const NO_CAP_AMBIENT_RAISE = 1_u32 << 6;
+        /// Set [`NO_CAP_AMBIENT_RAISE`] irreversibly.
+        const NO_CAP_AMBIENT_RAISE_LOCKED = 1_u32 << 7;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// Get the `securebits` flags of the calling thread.
+///
+/// # References
+///  - [`prctl(PR_GET_SECUREBITS,...)`]
+///
+/// [`prctl(PR_GET_SECUREBITS,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn capabilities_secure_bits() -> io::Result<CapabilitiesSecureBits> {
+    let r = unsafe { prctl_1arg(PR_GET_SECUREBITS)? } as c_uint;
+    CapabilitiesSecureBits::from_bits(r).ok_or(io::Errno::RANGE)
+}
+
+const PR_SET_SECUREBITS: c_int = 28;
+
+/// Set the `securebits` flags of the calling thread.
+///
+/// # References
+///  - [`prctl(PR_SET_SECUREBITS,...)`]
+///
+/// [`prctl(PR_SET_SECUREBITS,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn set_capabilities_secure_bits(bits: CapabilitiesSecureBits) -> io::Result<()> {
+    unsafe { prctl_2args(PR_SET_SECUREBITS, bits.bits() as usize as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_GET_TIMERSLACK/PR_SET_TIMERSLACK
+//
+
+const PR_GET_TIMERSLACK: c_int = 30;
+
+/// Get the `current` timer slack value of the calling thread.
+///
+/// # References
+///  - [`prctl(PR_GET_TIMERSLACK,...)`]
+///
+/// [`prctl(PR_GET_TIMERSLACK,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn current_timer_slack() -> io::Result<u64> {
+    unsafe { prctl_1arg(PR_GET_TIMERSLACK) }.map(|r| r as u64)
+}
+
+const PR_SET_TIMERSLACK: c_int = 29;
+
+/// Sets the `current` timer slack value for the calling thread.
+///
+/// # References
+///  - [`prctl(PR_SET_TIMERSLACK,...)`]
+///
+/// [`prctl(PR_SET_TIMERSLACK,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn set_current_timer_slack(value: Option<NonZeroU64>) -> io::Result<()> {
+    let value = usize::try_from(value.map_or(0, NonZeroU64::get)).map_err(|_r| io::Errno::RANGE)?;
+    unsafe { prctl_2args(PR_SET_TIMERSLACK, value as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_GET_NO_NEW_PRIVS/PR_SET_NO_NEW_PRIVS
+//
+
+const PR_GET_NO_NEW_PRIVS: c_int = 39;
+
+/// Get the value of the `no_new_privs` attribute for the calling thread.
+///
+/// # References
+///  - [`prctl(PR_GET_NO_NEW_PRIVS,...)`]
+///
+/// [`prctl(PR_GET_NO_NEW_PRIVS,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn no_new_privs() -> io::Result<bool> {
+    unsafe { prctl_1arg(PR_GET_NO_NEW_PRIVS) }.map(|r| r != 0)
+}
+
+const PR_SET_NO_NEW_PRIVS: c_int = 38;
+
+/// Set the calling thread's `no_new_privs` attribute.
+///
+/// # References
+///  - [`prctl(PR_SET_NO_NEW_PRIVS,...)`]
+///
+/// [`prctl(PR_SET_NO_NEW_PRIVS,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn set_no_new_privs(no_new_privs: bool) -> io::Result<()> {
+    unsafe { prctl_2args(PR_SET_NO_NEW_PRIVS, usize::from(no_new_privs) as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_GET_TID_ADDRESS
+//
+
+const PR_GET_TID_ADDRESS: c_int = 40;
+
+/// Get the `clear_child_tid` address set by `set_tid_address`
+/// and `clone`'s `CLONE_CHILD_CLEARTID` flag.
+///
+/// # References
+///  - [`prctl(PR_GET_TID_ADDRESS,...)`]
+///
+/// [`prctl(PR_GET_TID_ADDRESS,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn get_clear_child_tid_address() -> io::Result<Option<NonNull<c_void>>> {
+    unsafe { prctl_get_at_arg2_optional::<*mut c_void>(PR_GET_TID_ADDRESS) }.map(NonNull::new)
+}
+
+//
+// PR_GET_THP_DISABLE/PR_SET_THP_DISABLE
+//
+
+const PR_GET_THP_DISABLE: c_int = 42;
+
+/// Get the current setting of the `THP disable` flag for the calling thread.
+///
+/// # References
+///  - [`prctl(PR_GET_THP_DISABLE,...)`]
+///
+/// [`prctl(PR_GET_THP_DISABLE,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn transparent_huge_pages_are_disabled() -> io::Result<bool> {
+    unsafe { prctl_1arg(PR_GET_THP_DISABLE) }.map(|r| r != 0)
+}
+
+const PR_SET_THP_DISABLE: c_int = 41;
+
+/// Set the state of the `THP disable` flag for the calling thread.
+///
+/// # References
+///  - [`prctl(PR_SET_THP_DISABLE,...)`]
+///
+/// [`prctl(PR_SET_THP_DISABLE,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn disable_transparent_huge_pages(thp_disable: bool) -> io::Result<()> {
+    unsafe { prctl_2args(PR_SET_THP_DISABLE, usize::from(thp_disable) as *mut _) }.map(|_r| ())
+}
+
+//
+// PR_CAP_AMBIENT
+//
+
+const PR_CAP_AMBIENT: c_int = 47;
+
+const PR_CAP_AMBIENT_IS_SET: usize = 1;
+
+/// Check if the specified capability is in the ambient set.
+///
+/// # References
+///  - [`prctl(PR_CAP_AMBIENT,PR_CAP_AMBIENT_IS_SET,...)`]
+///
+/// [`prctl(PR_CAP_AMBIENT,PR_CAP_AMBIENT_IS_SET,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn capability_is_in_ambient_set(capability: Capability) -> io::Result<bool> {
+    let cap = capability as usize as *mut _;
+    unsafe { prctl_3args(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET as *mut _, cap) }.map(|r| r != 0)
+}
+
+const PR_CAP_AMBIENT_CLEAR_ALL: usize = 4;
+
+/// Remove all capabilities from the ambient set.
+///
+/// # References
+///  - [`prctl(PR_CAP_AMBIENT,PR_CAP_AMBIENT_CLEAR_ALL,...)`]
+///
+/// [`prctl(PR_CAP_AMBIENT,PR_CAP_AMBIENT_CLEAR_ALL,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn clear_ambient_capability_set() -> io::Result<()> {
+    unsafe { prctl_2args(PR_CAP_AMBIENT, PR_CAP_AMBIENT_CLEAR_ALL as *mut _) }.map(|_r| ())
+}
+
+const PR_CAP_AMBIENT_RAISE: usize = 2;
+const PR_CAP_AMBIENT_LOWER: usize = 3;
+
+/// Add or remove the specified capability to the ambient set.
+///
+/// # References
+///  - [`prctl(PR_CAP_AMBIENT,...)`]
+///
+/// [`prctl(PR_CAP_AMBIENT,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn configure_capability_in_ambient_set(capability: Capability, enable: bool) -> io::Result<()> {
+    let sub_operation = if enable {
+        PR_CAP_AMBIENT_RAISE
+    } else {
+        PR_CAP_AMBIENT_LOWER
+    };
+    let cap = capability as usize as *mut _;
+
+    unsafe { prctl_3args(PR_CAP_AMBIENT, sub_operation as *mut _, cap) }.map(|_r| ())
+}
+
+//
+// PR_SVE_GET_VL/PR_SVE_SET_VL
+//
+
+const PR_SVE_GET_VL: c_int = 51;
+
+const PR_SVE_VL_LEN_MASK: u32 = 0xffff;
+const PR_SVE_VL_INHERIT: u32 = 1_u32 << 17;
+
+/// Scalable Vector Extension vector length configuration.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub struct SVEVectorLengthConfig {
+    /// Vector length in bytes.
+    pub vector_length_in_bytes: u32,
+    /// Vector length inherited across `execve`.
+    pub vector_length_inherited_across_execve: bool,
+}
+
+/// Get the thread's current SVE vector length configuration.
+///
+/// # References
+///  - [`prctl(PR_SVE_GET_VL,...)`]
+///
+/// [`prctl(PR_SVE_GET_VL,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn sve_vector_length_configuration() -> io::Result<SVEVectorLengthConfig> {
+    let bits = unsafe { prctl_1arg(PR_SVE_GET_VL)? } as c_uint;
+    Ok(SVEVectorLengthConfig {
+        vector_length_in_bytes: bits & PR_SVE_VL_LEN_MASK,
+        vector_length_inherited_across_execve: (bits & PR_SVE_VL_INHERIT) != 0,
+    })
+}
+
+const PR_SVE_SET_VL: c_int = 50;
+
+const PR_SVE_SET_VL_ONEXEC: u32 = 1_u32 << 18;
+
+/// Configure the thread's vector length of Scalable Vector Extension.
+///
+/// # References
+///  - [`prctl(PR_SVE_SET_VL,...)`]
+///
+/// # Safety
+///
+/// Please ensure the conditions necessary to safely call this function,
+/// as detailed in the references above.
+///
+/// [`prctl(PR_SVE_SET_VL,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub unsafe fn set_sve_vector_length_configuration(
+    vector_length_in_bytes: usize,
+    vector_length_inherited_across_execve: bool,
+    defer_change_to_next_execve: bool,
+) -> io::Result<()> {
+    let vector_length_in_bytes =
+        u32::try_from(vector_length_in_bytes).map_err(|_r| io::Errno::RANGE)?;
+
+    let mut bits = vector_length_in_bytes & PR_SVE_VL_LEN_MASK;
+
+    if vector_length_inherited_across_execve {
+        bits |= PR_SVE_VL_INHERIT;
+    }
+
+    if defer_change_to_next_execve {
+        bits |= PR_SVE_SET_VL_ONEXEC;
+    }
+
+    prctl_2args(PR_SVE_SET_VL, bits as usize as *mut _).map(|_r| ())
+}
+
+//
+// PR_PAC_RESET_KEYS
+//
+
+const PR_PAC_RESET_KEYS: c_int = 54;
+
+/// Securely reset the thread's pointer authentication keys to fresh random
+/// values generated by the kernel.
+///
+/// # References
+///  - [`prctl(PR_PAC_RESET_KEYS,...)`]
+///
+/// # Safety
+///
+/// Please ensure the conditions necessary to safely call this function,
+/// as detailed in the references above.
+///
+/// [`prctl(PR_PAC_RESET_KEYS,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub unsafe fn reset_pointer_authentication_keys(
+    keys: Option<PointerAuthenticationKeys>,
+) -> io::Result<()> {
+    let keys = keys.as_ref().map_or(0_u32, PointerAuthenticationKeys::bits);
+    prctl_2args(PR_PAC_RESET_KEYS, keys as usize as *mut _).map(|_r| ())
+}
+
+//
+// PR_GET_TAGGED_ADDR_CTRL/PR_SET_TAGGED_ADDR_CTRL
+//
+
+const PR_GET_TAGGED_ADDR_CTRL: c_int = 56;
+
+const PR_MTE_TAG_SHIFT: u32 = 3;
+const PR_MTE_TAG_MASK: u32 = 0xffff_u32 << PR_MTE_TAG_SHIFT;
+
+bitflags! {
+    /// Zero means addresses that are passed for the purpose of being
+    /// dereferenced by the kernel must be untagged.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct TaggedAddressMode: u32 {
+        /// Addresses that are passed for the purpose of being dereferenced by
+        /// the kernel may be tagged.
+        const ENABLED = 1_u32 << 0;
+        /// Synchronous tag check fault mode.
+        const TCF_SYNC = 1_u32 << 1;
+        /// Asynchronous tag check fault mode.
+        const TCF_ASYNC = 1_u32 << 2;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// Get the current tagged address mode for the calling thread.
+///
+/// # References
+///  - [`prctl(PR_GET_TAGGED_ADDR_CTRL,...)`]
+///
+/// [`prctl(PR_GET_TAGGED_ADDR_CTRL,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub fn current_tagged_address_mode() -> io::Result<(Option<TaggedAddressMode>, u32)> {
+    let r = unsafe { prctl_1arg(PR_GET_TAGGED_ADDR_CTRL)? } as c_uint;
+    let mode = r & 0b111_u32;
+    let mte_tag = (r & PR_MTE_TAG_MASK) >> PR_MTE_TAG_SHIFT;
+    Ok((TaggedAddressMode::from_bits(mode), mte_tag))
+}
+
+const PR_SET_TAGGED_ADDR_CTRL: c_int = 55;
+
+/// Controls support for passing tagged user-space addresses to the kernel.
+///
+/// # References
+///  - [`prctl(PR_SET_TAGGED_ADDR_CTRL,...)`]
+///
+/// # Safety
+///
+/// Please ensure the conditions necessary to safely call this function, as
+/// detailed in the references above.
+///
+/// [`prctl(PR_SET_TAGGED_ADDR_CTRL,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub unsafe fn set_current_tagged_address_mode(
+    mode: Option<TaggedAddressMode>,
+    mte_tag: u32,
+) -> io::Result<()> {
+    let config = mode.as_ref().map_or(0_u32, TaggedAddressMode::bits)
+        | ((mte_tag << PR_MTE_TAG_SHIFT) & PR_MTE_TAG_MASK);
+    prctl_2args(PR_SET_TAGGED_ADDR_CTRL, config as usize as *mut _).map(|_r| ())
+}
+
+//
+// PR_SET_SYSCALL_USER_DISPATCH
+//
+
+const PR_SET_SYSCALL_USER_DISPATCH: c_int = 59;
+
+const PR_SYS_DISPATCH_OFF: usize = 0;
+
+/// Disable Syscall User Dispatch mechanism.
+///
+/// # References
+///  - [`prctl(PR_SET_SYSCALL_USER_DISPATCH,PR_SYS_DISPATCH_OFF,...)`]
+///
+/// # Safety
+///
+/// Please ensure the conditions necessary to safely call this function, as
+/// detailed in the references above.
+///
+/// [`prctl(PR_SET_SYSCALL_USER_DISPATCH,PR_SYS_DISPATCH_OFF,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub unsafe fn disable_syscall_user_dispatch() -> io::Result<()> {
+    prctl_2args(PR_SET_SYSCALL_USER_DISPATCH, PR_SYS_DISPATCH_OFF as *mut _).map(|_r| ())
+}
+
+const PR_SYS_DISPATCH_ON: usize = 1;
+
+/// Allow system calls to be executed.
+const SYSCALL_DISPATCH_FILTER_ALLOW: u8 = 0;
+/// Block system calls from executing.
+const SYSCALL_DISPATCH_FILTER_BLOCK: u8 = 1;
+
+/// Value of the fast switch flag controlling system calls user dispatch
+/// mechanism without the need to issue a syscall.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(u8)]
+pub enum SysCallUserDispatchFastSwitch {
+    /// System calls are allowed to execute.
+    Allow = SYSCALL_DISPATCH_FILTER_ALLOW,
+    /// System calls are blocked from executing.
+    Block = SYSCALL_DISPATCH_FILTER_BLOCK,
+}
+
+impl TryFrom<u8> for SysCallUserDispatchFastSwitch {
+    type Error = io::Errno;
+
+    fn try_from(value: u8) -> Result<Self, Self::Error> {
+        match value {
+            SYSCALL_DISPATCH_FILTER_ALLOW => Ok(Self::Allow),
+            SYSCALL_DISPATCH_FILTER_BLOCK => Ok(Self::Block),
+            _ => Err(io::Errno::RANGE),
+        }
+    }
+}
+
+/// Enable Syscall User Dispatch mechanism.
+///
+/// # References
+///  - [`prctl(PR_SET_SYSCALL_USER_DISPATCH,PR_SYS_DISPATCH_ON,...)`]
+///
+/// # Safety
+///
+/// Please ensure the conditions necessary to safely call this function, as
+/// detailed in the references above.
+///
+/// [`prctl(PR_SET_SYSCALL_USER_DISPATCH,PR_SYS_DISPATCH_ON,...)`]: https://man7.org/linux/man-pages/man2/prctl.2.html
+#[inline]
+pub unsafe fn enable_syscall_user_dispatch(
+    always_allowed_region: &[u8],
+    fast_switch_flag: &AtomicU8,
+) -> io::Result<()> {
+    syscalls::prctl(
+        PR_SET_SYSCALL_USER_DISPATCH,
+        PR_SYS_DISPATCH_ON as *mut _,
+        always_allowed_region.as_ptr() as *mut _,
+        always_allowed_region.len() as *mut _,
+        as_ptr(fast_switch_flag) as *mut _,
+    )
+    .map(|_r| ())
+}
+
+//
+// PR_SCHED_CORE
+//
+
+const PR_SCHED_CORE: c_int = 62;
+
+const PR_SCHED_CORE_GET: usize = 0;
+
+const PR_SCHED_CORE_SCOPE_THREAD: u32 = 0;
+const PR_SCHED_CORE_SCOPE_THREAD_GROUP: u32 = 1;
+const PR_SCHED_CORE_SCOPE_PROCESS_GROUP: u32 = 2;
+
+/// `PR_SCHED_CORE_SCOPE_*`.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(u32)]
+pub enum CoreSchedulingScope {
+    /// Operation will be performed for the thread.
+    Thread = PR_SCHED_CORE_SCOPE_THREAD,
+    /// Operation will be performed for all tasks in the task group of the
+    /// process.
+    ThreadGroup = PR_SCHED_CORE_SCOPE_THREAD_GROUP,
+    /// Operation will be performed for all processes in the process group.
+    ProcessGroup = PR_SCHED_CORE_SCOPE_PROCESS_GROUP,
+}
+
+impl TryFrom<u32> for CoreSchedulingScope {
+    type Error = io::Errno;
+
+    fn try_from(value: u32) -> Result<Self, Self::Error> {
+        match value {
+            PR_SCHED_CORE_SCOPE_THREAD => Ok(Self::Thread),
+            PR_SCHED_CORE_SCOPE_THREAD_GROUP => Ok(Self::ThreadGroup),
+            PR_SCHED_CORE_SCOPE_PROCESS_GROUP => Ok(Self::ProcessGroup),
+            _ => Err(io::Errno::RANGE),
+        }
+    }
+}
+
+/// Get core scheduling cookie of a process.
+///
+/// # References
+///  - [`prctl(PR_SCHED_CORE,PR_SCHED_CORE_GET,...)`]
+///
+/// [`prctl(PR_SCHED_CORE,PR_SCHED_CORE_GET,...)`]: https://www.kernel.org/doc/html/v5.18/admin-guide/hw-vuln/core-scheduling.html
+#[inline]
+pub fn core_scheduling_cookie(pid: Pid, scope: CoreSchedulingScope) -> io::Result<u64> {
+    let mut value: MaybeUninit<u64> = MaybeUninit::uninit();
+    unsafe {
+        syscalls::prctl(
+            PR_SCHED_CORE,
+            PR_SCHED_CORE_GET as *mut _,
+            pid.as_raw_nonzero().get() as usize as *mut _,
+            scope as usize as *mut _,
+            value.as_mut_ptr().cast(),
+        )?;
+        Ok(value.assume_init())
+    }
+}
+
+const PR_SCHED_CORE_CREATE: usize = 1;
+
+/// Create unique core scheduling cookie.
+///
+/// # References
+///  - [`prctl(PR_SCHED_CORE,PR_SCHED_CORE_CREATE,...)`]
+///
+/// [`prctl(PR_SCHED_CORE,PR_SCHED_CORE_CREATE,...)`]: https://www.kernel.org/doc/html/v5.18/admin-guide/hw-vuln/core-scheduling.html
+#[inline]
+pub fn create_core_scheduling_cookie(pid: Pid, scope: CoreSchedulingScope) -> io::Result<()> {
+    unsafe {
+        syscalls::prctl(
+            PR_SCHED_CORE,
+            PR_SCHED_CORE_CREATE as *mut _,
+            pid.as_raw_nonzero().get() as usize as *mut _,
+            scope as usize as *mut _,
+            ptr::null_mut(),
+        )
+        .map(|_r| ())
+    }
+}
+
+const PR_SCHED_CORE_SHARE_TO: usize = 2;
+
+/// Push core scheduling cookie to a process.
+///
+/// # References
+///  - [`prctl(PR_SCHED_CORE,PR_SCHED_CORE_SHARE_TO,...)`]
+///
+/// [`prctl(PR_SCHED_CORE,PR_SCHED_CORE_SHARE_TO,...)`]: https://www.kernel.org/doc/html/v5.18/admin-guide/hw-vuln/core-scheduling.html
+#[inline]
+pub fn push_core_scheduling_cookie(pid: Pid, scope: CoreSchedulingScope) -> io::Result<()> {
+    unsafe {
+        syscalls::prctl(
+            PR_SCHED_CORE,
+            PR_SCHED_CORE_SHARE_TO as *mut _,
+            pid.as_raw_nonzero().get() as usize as *mut _,
+            scope as usize as *mut _,
+            ptr::null_mut(),
+        )
+        .map(|_r| ())
+    }
+}
+
+const PR_SCHED_CORE_SHARE_FROM: usize = 3;
+
+/// Pull core scheduling cookie from a process.
+///
+/// # References
+///  - [`prctl(PR_SCHED_CORE,PR_SCHED_CORE_SHARE_FROM,...)`]
+///
+/// [`prctl(PR_SCHED_CORE,PR_SCHED_CORE_SHARE_FROM,...)`]: https://www.kernel.org/doc/html/v5.18/admin-guide/hw-vuln/core-scheduling.html
+#[inline]
+pub fn pull_core_scheduling_cookie(pid: Pid, scope: CoreSchedulingScope) -> io::Result<()> {
+    unsafe {
+        syscalls::prctl(
+            PR_SCHED_CORE,
+            PR_SCHED_CORE_SHARE_FROM as *mut _,
+            pid.as_raw_nonzero().get() as usize as *mut _,
+            scope as usize as *mut _,
+            ptr::null_mut(),
+        )
+        .map(|_r| ())
+    }
+}
diff --git a/vendor/rustix/src/thread/setns.rs b/vendor/rustix/src/thread/setns.rs
new file mode 100644
index 0000000..ef61d11
--- /dev/null
+++ b/vendor/rustix/src/thread/setns.rs
@@ -0,0 +1,137 @@
+use bitflags::bitflags;
+use linux_raw_sys::general::{
+    CLONE_FILES, CLONE_FS, CLONE_NEWCGROUP, CLONE_NEWIPC, CLONE_NEWNET, CLONE_NEWNS, CLONE_NEWPID,
+    CLONE_NEWTIME, CLONE_NEWUSER, CLONE_NEWUTS, CLONE_SYSVSEM,
+};
+
+use crate::backend::c::c_int;
+use crate::backend::thread::syscalls;
+use crate::fd::BorrowedFd;
+use crate::io;
+
+bitflags! {
+    /// Thread name space type.
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct ThreadNameSpaceType: u32 {
+        /// Time name space.
+        const TIME = CLONE_NEWTIME;
+        /// Mount name space.
+        const MOUNT = CLONE_NEWNS;
+        /// Control group (CGroup) name space.
+        const CONTROL_GROUP = CLONE_NEWCGROUP;
+        /// `Host name` and `NIS domain name` (UTS) name space.
+        const HOST_NAME_AND_NIS_DOMAIN_NAME = CLONE_NEWUTS;
+        /// Inter-process communication (IPC) name space.
+        const INTER_PROCESS_COMMUNICATION = CLONE_NEWIPC;
+        /// User name space.
+        const USER = CLONE_NEWUSER;
+        /// Process ID name space.
+        const PROCESS_ID = CLONE_NEWPID;
+        /// Network name space.
+        const NETWORK = CLONE_NEWNET;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// Type of name space referred to by a link.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[repr(u32)]
+pub enum LinkNameSpaceType {
+    /// Time name space.
+    Time = CLONE_NEWTIME,
+    /// Mount name space.
+    Mount = CLONE_NEWNS,
+    /// Control group (CGroup) name space.
+    ControlGroup = CLONE_NEWCGROUP,
+    /// `Host name` and `NIS domain name` (UTS) name space.
+    HostNameAndNISDomainName = CLONE_NEWUTS,
+    /// Inter-process communication (IPC) name space.
+    InterProcessCommunication = CLONE_NEWIPC,
+    /// User name space.
+    User = CLONE_NEWUSER,
+    /// Process ID name space.
+    ProcessID = CLONE_NEWPID,
+    /// Network name space.
+    Network = CLONE_NEWNET,
+}
+
+bitflags! {
+    /// `CLONE_*` for use with [`unshare`].
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct UnshareFlags: u32 {
+        /// `CLONE_FILES`.
+        const FILES = CLONE_FILES;
+        /// `CLONE_FS`.
+        const FS = CLONE_FS;
+        /// `CLONE_NEWCGROUP`.
+        const NEWCGROUP = CLONE_NEWCGROUP;
+        /// `CLONE_NEWIPC`.
+        const NEWIPC = CLONE_NEWIPC;
+        /// `CLONE_NEWNET`.
+        const NEWNET = CLONE_NEWNET;
+        /// `CLONE_NEWNS`.
+        const NEWNS = CLONE_NEWNS;
+        /// `CLONE_NEWPID`.
+        const NEWPID = CLONE_NEWPID;
+        /// `CLONE_NEWTIME`.
+        const NEWTIME = CLONE_NEWTIME;
+        /// `CLONE_NEWUSER`.
+        const NEWUSER = CLONE_NEWUSER;
+        /// `CLONE_NEWUTS`
+        const NEWUTS = CLONE_NEWUTS;
+        /// `CLONE_SYSVSEM`.
+        const SYSVSEM = CLONE_SYSVSEM;
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+/// Reassociate the calling thread with the namespace associated with link
+/// referred to by `fd`.
+///
+/// `fd` must refer to one of the magic links in a `/proc/[pid]/ns/` directory,
+/// or a bind mount to such a link.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/setns.2.html
+pub fn move_into_link_name_space(
+    fd: BorrowedFd<'_>,
+    allowed_type: Option<LinkNameSpaceType>,
+) -> io::Result<()> {
+    let allowed_type = allowed_type.map_or(0, |t| t as c_int);
+    syscalls::setns(fd, allowed_type).map(|_r| ())
+}
+
+/// Atomically move the calling thread into one or more of the same namespaces
+/// as the thread referred to by `fd`.
+///
+/// `fd` must refer to a thread ID. See: `pidfd_open` and `clone`.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/setns.2.html
+pub fn move_into_thread_name_spaces(
+    fd: BorrowedFd<'_>,
+    allowed_types: ThreadNameSpaceType,
+) -> io::Result<()> {
+    syscalls::setns(fd, allowed_types.bits() as c_int).map(|_r| ())
+}
+
+/// `unshare(flags)`—Disassociate parts of the current thread's execution
+/// context with other threads.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/unshare.2.html
+pub fn unshare(flags: UnshareFlags) -> io::Result<()> {
+    syscalls::unshare(flags)
+}
diff --git a/vendor/rustix/src/time/clock.rs b/vendor/rustix/src/time/clock.rs
new file mode 100644
index 0000000..db585d1
--- /dev/null
+++ b/vendor/rustix/src/time/clock.rs
@@ -0,0 +1,108 @@
+use crate::{backend, io};
+
+pub use crate::timespec::{Nsecs, Secs, Timespec};
+
+/// `clockid_t`
+#[cfg(not(target_os = "wasi"))]
+pub use crate::clockid::{ClockId, DynamicClockId};
+
+/// `clock_getres(id)`—Returns the resolution of a clock.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_getres.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/clock_getres.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=clock_getres&sektion=2
+/// [NetBSD]: https://man.netbsd.org/clock_getres.2
+/// [OpenBSD]: https://man.openbsd.org/clock_getres.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=clock_getres&section=2
+/// [illumos]: https://illumos.org/man/3C/clock_getres
+#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+#[inline]
+#[must_use]
+pub fn clock_getres(id: ClockId) -> Timespec {
+    backend::time::syscalls::clock_getres(id)
+}
+
+/// `clock_gettime(id)`—Returns the current value of a clock.
+///
+/// This function uses `ClockId` which only contains clocks which are known to
+/// always be supported at runtime, allowing this function to be infallible.
+/// For a greater set of clocks and dynamic clock support, see
+/// [`clock_gettime_dynamic`].
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_gettime.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/clock_gettime.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=clock_getres&sektion=2
+/// [NetBSD]: https://man.netbsd.org/clock_getres.2
+/// [OpenBSD]: https://man.openbsd.org/clock_getres.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=clock_getres&section=2
+/// [illumos]: https://illumos.org/man/3C/clock_gettime
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+#[must_use]
+pub fn clock_gettime(id: ClockId) -> Timespec {
+    backend::time::syscalls::clock_gettime(id)
+}
+
+/// Like [`clock_gettime`] but with support for dynamic clocks.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_gettime.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/clock_gettime.2.html
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub fn clock_gettime_dynamic(id: DynamicClockId<'_>) -> io::Result<Timespec> {
+    backend::time::syscalls::clock_gettime_dynamic(id)
+}
+
+/// `clock_settime(id, timespec)`—Sets the current value of a settable clock.
+///
+/// This fails with [`io::Errno::INVAL`] if the clock is not settable, and
+/// [`io::Errno::ACCESS`] if the current process does not have permission to
+/// set it.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_settime.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/clock_settime.2.html
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=clock_settime&sektion=2
+/// [NetBSD]: https://man.netbsd.org/clock_settime.2
+/// [OpenBSD]: https://man.openbsd.org/clock_settime.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=clock_settime&section=2
+/// [illumos]: https://illumos.org/man/3C/clock_settime
+#[cfg(not(any(
+    target_os = "redox",
+    target_os = "wasi",
+    all(apple, not(target_os = "macos"))
+)))]
+#[inline]
+pub fn clock_settime(id: ClockId, timespec: Timespec) -> io::Result<()> {
+    backend::time::syscalls::clock_settime(id, timespec)
+}
diff --git a/vendor/rustix/src/time/mod.rs b/vendor/rustix/src/time/mod.rs
new file mode 100644
index 0000000..c633e76
--- /dev/null
+++ b/vendor/rustix/src/time/mod.rs
@@ -0,0 +1,11 @@
+//! Time-related operations.
+
+mod clock;
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+mod timerfd;
+
+// TODO: Convert WASI'S clock APIs to use handles rather than ambient clock
+// identifiers, update `wasi-libc`, and then add support in `rustix`.
+pub use clock::*;
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+pub use timerfd::*;
diff --git a/vendor/rustix/src/time/timerfd.rs b/vendor/rustix/src/time/timerfd.rs
new file mode 100644
index 0000000..7f661f7
--- /dev/null
+++ b/vendor/rustix/src/time/timerfd.rs
@@ -0,0 +1,41 @@
+use crate::fd::{AsFd, OwnedFd};
+use crate::{backend, io};
+
+pub use backend::time::types::{Itimerspec, TimerfdClockId, TimerfdFlags, TimerfdTimerFlags};
+
+/// `timerfd_create(clockid, flags)`—Create a timer.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/timerfd_create.2.html
+#[inline]
+pub fn timerfd_create(clockid: TimerfdClockId, flags: TimerfdFlags) -> io::Result<OwnedFd> {
+    backend::time::syscalls::timerfd_create(clockid, flags)
+}
+
+/// `timerfd_settime(clockid, flags, new_value)`—Set the time on a timer.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/timerfd_settime.2.html
+#[inline]
+pub fn timerfd_settime<Fd: AsFd>(
+    fd: Fd,
+    flags: TimerfdTimerFlags,
+    new_value: &Itimerspec,
+) -> io::Result<Itimerspec> {
+    backend::time::syscalls::timerfd_settime(fd.as_fd(), flags, new_value)
+}
+
+/// `timerfd_gettime(clockid, flags)`—Query a timer.
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/timerfd_gettime.2.html
+#[inline]
+pub fn timerfd_gettime<Fd: AsFd>(fd: Fd) -> io::Result<Itimerspec> {
+    backend::time::syscalls::timerfd_gettime(fd.as_fd())
+}
diff --git a/vendor/rustix/src/timespec.rs b/vendor/rustix/src/timespec.rs
new file mode 100644
index 0000000..a2df0e7
--- /dev/null
+++ b/vendor/rustix/src/timespec.rs
@@ -0,0 +1,115 @@
+//! `Timespec` and related types, which are used by multiple public API
+//! modules.
+
+#[cfg(not(fix_y2038))]
+use crate::backend::c;
+
+/// `struct timespec`
+#[cfg(not(fix_y2038))]
+pub type Timespec = c::timespec;
+
+/// `struct timespec`
+#[cfg(fix_y2038)]
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct Timespec {
+    /// Seconds.
+    pub tv_sec: Secs,
+
+    /// Nanoseconds. Must be less than 1_000_000_000.
+    pub tv_nsec: Nsecs,
+}
+
+/// A type for the `tv_sec` field of [`Timespec`].
+#[cfg(not(fix_y2038))]
+#[allow(deprecated)]
+pub type Secs = c::time_t;
+
+/// A type for the `tv_sec` field of [`Timespec`].
+#[cfg(fix_y2038)]
+pub type Secs = i64;
+
+/// A type for the `tv_sec` field of [`Timespec`].
+#[cfg(any(
+    fix_y2038,
+    linux_raw,
+    all(libc, target_arch = "x86_64", target_pointer_width = "32")
+))]
+pub type Nsecs = i64;
+
+/// A type for the `tv_nsec` field of [`Timespec`].
+#[cfg(all(
+    not(fix_y2038),
+    libc,
+    not(all(target_arch = "x86_64", target_pointer_width = "32"))
+))]
+pub type Nsecs = c::c_long;
+
+/// On 32-bit glibc platforms, `timespec` has anonymous padding fields, which
+/// Rust doesn't support yet (see `unnamed_fields`), so we define our own
+/// struct with explicit padding, with bidirectional `From` impls.
+#[cfg(fix_y2038)]
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub(crate) struct LibcTimespec {
+    pub(crate) tv_sec: Secs,
+
+    #[cfg(target_endian = "big")]
+    padding: core::mem::MaybeUninit<u32>,
+
+    pub(crate) tv_nsec: i32,
+
+    #[cfg(target_endian = "little")]
+    padding: core::mem::MaybeUninit<u32>,
+}
+
+#[cfg(fix_y2038)]
+impl From<LibcTimespec> for Timespec {
+    #[inline]
+    fn from(t: LibcTimespec) -> Self {
+        Self {
+            tv_sec: t.tv_sec,
+            tv_nsec: t.tv_nsec as _,
+        }
+    }
+}
+
+#[cfg(fix_y2038)]
+impl From<Timespec> for LibcTimespec {
+    #[inline]
+    fn from(t: Timespec) -> Self {
+        Self {
+            tv_sec: t.tv_sec,
+            tv_nsec: t.tv_nsec as _,
+            padding: core::mem::MaybeUninit::uninit(),
+        }
+    }
+}
+
+#[test]
+fn test_sizes() {
+    assert_eq_size!(Secs, u64);
+    const_assert!(core::mem::size_of::<Timespec>() >= core::mem::size_of::<(u64, u32)>());
+    const_assert!(core::mem::size_of::<Nsecs>() >= 4);
+
+    let mut t = Timespec {
+        tv_sec: 0,
+        tv_nsec: 0,
+    };
+
+    // `tv_nsec` needs to be able to hold nanoseconds up to a second.
+    t.tv_nsec = 999_999_999_u32 as _;
+    assert_eq!(t.tv_nsec as u64, 999_999_999_u64);
+
+    // `tv_sec` needs to be able to hold more than 32-bits of seconds.
+    t.tv_sec = 0x1_0000_0000_u64 as _;
+    assert_eq!(t.tv_sec as u64, 0x1_0000_0000_u64);
+}
+
+// Test that our workarounds are needed.
+#[cfg(fix_y2038)]
+#[test]
+#[allow(deprecated)]
+fn test_fix_y2038() {
+    assert_eq_size!(libc::time_t, u32);
+}
diff --git a/vendor/rustix/src/ugid.rs b/vendor/rustix/src/ugid.rs
new file mode 100644
index 0000000..57cc666
--- /dev/null
+++ b/vendor/rustix/src/ugid.rs
@@ -0,0 +1,98 @@
+//! User and Group ID types.
+
+#![allow(unsafe_code)]
+
+use crate::backend::c;
+
+/// A group identifier as a raw integer.
+#[cfg(not(target_os = "wasi"))]
+pub type RawGid = c::gid_t;
+/// A user identifier as a raw integer.
+#[cfg(not(target_os = "wasi"))]
+pub type RawUid = c::uid_t;
+
+/// `uid_t`—A Unix user ID.
+#[repr(transparent)]
+#[derive(Copy, Clone, Eq, PartialEq, Debug, Hash)]
+pub struct Uid(RawUid);
+
+/// `gid_t`—A Unix group ID.
+#[repr(transparent)]
+#[derive(Copy, Clone, Eq, PartialEq, Debug, Hash)]
+pub struct Gid(RawGid);
+
+impl Uid {
+    /// A `Uid` corresponding to the root user (uid 0).
+    pub const ROOT: Self = Self(0);
+
+    /// Converts a `RawUid` into a `Uid`.
+    ///
+    /// # Safety
+    ///
+    /// `raw` must be the value of a valid Unix user ID.
+    #[inline]
+    pub const unsafe fn from_raw(raw: RawUid) -> Self {
+        Self(raw)
+    }
+
+    /// Converts a `Uid` into a `RawUid`.
+    #[inline]
+    pub const fn as_raw(self) -> RawUid {
+        self.0
+    }
+
+    /// Test whether this uid represents the root user (uid 0).
+    #[inline]
+    pub const fn is_root(self) -> bool {
+        self.0 == Self::ROOT.0
+    }
+}
+
+impl Gid {
+    /// A `Gid` corresponding to the root group (gid 0).
+    pub const ROOT: Self = Self(0);
+
+    /// Converts a `RawGid` into a `Gid`.
+    ///
+    /// # Safety
+    ///
+    /// `raw` must be the value of a valid Unix group ID.
+    #[inline]
+    pub const unsafe fn from_raw(raw: RawGid) -> Self {
+        Self(raw)
+    }
+
+    /// Converts a `Gid` into a `RawGid`.
+    #[inline]
+    pub const fn as_raw(self) -> RawGid {
+        self.0
+    }
+
+    /// Test whether this gid represents the root group (gid 0).
+    #[inline]
+    pub const fn is_root(self) -> bool {
+        self.0 == Self::ROOT.0
+    }
+}
+
+// Return the raw value of the IDs. In case of `None` it returns `!0` since it
+// has the same bit pattern as `-1` indicating no change to the owner/group ID.
+pub(crate) fn translate_fchown_args(owner: Option<Uid>, group: Option<Gid>) -> (RawUid, RawGid) {
+    let ow = match owner {
+        Some(o) => o.as_raw(),
+        None => !0,
+    };
+
+    let gr = match group {
+        Some(g) => g.as_raw(),
+        None => !0,
+    };
+
+    (ow, gr)
+}
+
+#[test]
+fn test_sizes() {
+    assert_eq_size!(RawUid, u32);
+    assert_eq_size!(RawGid, u32);
+}
diff --git a/vendor/rustix/src/utils.rs b/vendor/rustix/src/utils.rs
new file mode 100644
index 0000000..d21ed88
--- /dev/null
+++ b/vendor/rustix/src/utils.rs
@@ -0,0 +1,82 @@
+//! Miscellaneous minor utilities.
+
+#![allow(dead_code)]
+#![allow(unused_macros)]
+
+use core::ffi::c_void;
+use core::mem::{align_of, size_of};
+use core::ptr::{null, null_mut, NonNull};
+
+/// Convert a `&T` into a `*const T` without using an `as`.
+#[inline]
+pub(crate) const fn as_ptr<T>(t: &T) -> *const T {
+    t
+}
+
+/// Convert a `&mut T` into a `*mut T` without using an `as`.
+#[inline]
+pub(crate) fn as_mut_ptr<T>(t: &mut T) -> *mut T {
+    t
+}
+
+/// Convert an `Option<&T>` into a possibly-null `*const T`.
+#[inline]
+pub(crate) const fn option_as_ptr<T>(t: Option<&T>) -> *const T {
+    match t {
+        Some(t) => t,
+        None => null(),
+    }
+}
+
+/// Convert an `Option<&mut T>` into a possibly-null `*mut T`.
+#[inline]
+pub(crate) fn option_as_mut_ptr<T>(t: Option<&mut T>) -> *mut T {
+    match t {
+        Some(t) => t,
+        None => null_mut(),
+    }
+}
+
+/// Convert a `*mut c_void` to a `*mut T`, checking that it is not null,
+/// misaligned, or pointing to a region of memory that wraps around the address
+/// space.
+pub(crate) fn check_raw_pointer<T>(value: *mut c_void) -> Option<NonNull<T>> {
+    if (value as usize).checked_add(size_of::<T>()).is_none()
+        || (value as usize) % align_of::<T>() != 0
+    {
+        return None;
+    }
+
+    NonNull::new(value.cast())
+}
+
+/// Create an array value containing all default values, inferring the type.
+#[inline]
+pub(crate) fn default_array<T: Default + Copy, const N: usize>() -> [T; N] {
+    [T::default(); N]
+}
+
+/// Create a union value containing a default value in one of its arms.
+///
+/// The field names a union field which must have the same size as the union
+/// itself.
+macro_rules! default_union {
+    ($union:ident, $field:ident) => {{
+        let u = $union {
+            $field: Default::default(),
+        };
+
+        // Assert that the given field initializes the whole union.
+        #[cfg(test)]
+        unsafe {
+            let field_value = u.$field;
+            assert_eq!(
+                core::mem::size_of_val(&u),
+                core::mem::size_of_val(&field_value)
+            );
+            const_assert_eq!(memoffset::offset_of_union!($union, $field), 0);
+        }
+
+        u
+    }};
+}
diff --git a/vendor/rustix/src/weak.rs b/vendor/rustix/src/weak.rs
new file mode 100644
index 0000000..3cda8e6
--- /dev/null
+++ b/vendor/rustix/src/weak.rs
@@ -0,0 +1,286 @@
+// Implementation derived from `weak` in Rust's
+// library/std/src/sys/unix/weak.rs at revision
+// fd0cb0cdc21dd9c06025277d772108f8d42cb25f.
+//
+// Ideally we should update to a newer version which doesn't need `dlsym`,
+// however that depends on the `extern_weak` feature which is currently
+// unstable.
+
+#![cfg_attr(linux_raw, allow(unsafe_code))]
+
+//! Support for "weak linkage" to symbols on Unix
+//!
+//! Some I/O operations we do in libstd require newer versions of OSes but we
+//! need to maintain binary compatibility with older releases for now. In order
+//! to use the new functionality when available we use this module for
+//! detection.
+//!
+//! One option to use here is weak linkage, but that is unfortunately only
+//! really workable on Linux. Hence, use dlsym to get the symbol value at
+//! runtime. This is also done for compatibility with older versions of glibc,
+//! and to avoid creating dependencies on `GLIBC_PRIVATE` symbols. It assumes
+//! that we've been dynamically linked to the library the symbol comes from,
+//! but that is currently always the case for things like libpthread/libc.
+//!
+//! A long time ago this used weak linkage for the `__pthread_get_minstack`
+//! symbol, but that caused Debian to detect an unnecessarily strict versioned
+//! dependency on libc6 (#23628).
+
+// There are a variety of `#[cfg]`s controlling which targets are involved in
+// each instance of `weak!` and `syscall!`. Rather than trying to unify all of
+// that, we'll just allow that some unix targets don't use this module at all.
+#![allow(dead_code, unused_macros)]
+#![allow(clippy::doc_markdown)]
+
+use crate::ffi::CStr;
+use core::ffi::c_void;
+use core::ptr::null_mut;
+use core::sync::atomic::{self, AtomicPtr, Ordering};
+use core::{marker, mem};
+
+const NULL: *mut c_void = null_mut();
+const INVALID: *mut c_void = 1 as *mut c_void;
+
+macro_rules! weak {
+    ($vis:vis fn $name:ident($($t:ty),*) -> $ret:ty) => (
+        #[allow(non_upper_case_globals)]
+        $vis static $name: $crate::weak::Weak<unsafe extern fn($($t),*) -> $ret> =
+            $crate::weak::Weak::new(concat!(stringify!($name), '\0'));
+    )
+}
+
+pub(crate) struct Weak<F> {
+    name: &'static str,
+    addr: AtomicPtr<c_void>,
+    _marker: marker::PhantomData<F>,
+}
+
+impl<F> Weak<F> {
+    pub(crate) const fn new(name: &'static str) -> Self {
+        Self {
+            name,
+            addr: AtomicPtr::new(INVALID),
+            _marker: marker::PhantomData,
+        }
+    }
+
+    pub(crate) fn get(&self) -> Option<F> {
+        assert_eq!(mem::size_of::<F>(), mem::size_of::<usize>());
+        unsafe {
+            // Relaxed is fine here because we fence before reading through the
+            // pointer (see the comment below).
+            match self.addr.load(Ordering::Relaxed) {
+                INVALID => self.initialize(),
+                NULL => None,
+                addr => {
+                    let func = mem::transmute_copy::<*mut c_void, F>(&addr);
+                    // The caller is presumably going to read through this value
+                    // (by calling the function we've dlsymed). This means we'd
+                    // need to have loaded it with at least C11's consume
+                    // ordering in order to be guaranteed that the data we read
+                    // from the pointer isn't from before the pointer was
+                    // stored. Rust has no equivalent to memory_order_consume,
+                    // so we use an acquire fence (sorry, ARM).
+                    //
+                    // Now, in practice this likely isn't needed even on CPUs
+                    // where relaxed and consume mean different things. The
+                    // symbols we're loading are probably present (or not) at
+                    // init, and even if they aren't the runtime dynamic loader
+                    // is extremely likely have sufficient barriers internally
+                    // (possibly implicitly, for example the ones provided by
+                    // invoking `mprotect`).
+                    //
+                    // That said, none of that's *guaranteed*, and so we fence.
+                    atomic::fence(Ordering::Acquire);
+                    Some(func)
+                }
+            }
+        }
+    }
+
+    // Cold because it should only happen during first-time initialization.
+    #[cold]
+    unsafe fn initialize(&self) -> Option<F> {
+        let val = fetch(self.name);
+        // This synchronizes with the acquire fence in `get`.
+        self.addr.store(val, Ordering::Release);
+
+        match val {
+            NULL => None,
+            addr => Some(mem::transmute_copy::<*mut c_void, F>(&addr)),
+        }
+    }
+}
+
+// To avoid having the `linux_raw` backend depend on the libc crate, just
+// declare the few things we need in a module called `libc` so that `fetch`
+// uses it.
+#[cfg(linux_raw)]
+mod libc {
+    use core::ptr;
+    use linux_raw_sys::ctypes::{c_char, c_void};
+
+    #[cfg(all(target_os = "android", target_pointer_width = "32"))]
+    pub(super) const RTLD_DEFAULT: *mut c_void = -1isize as *mut c_void;
+    #[cfg(not(all(target_os = "android", target_pointer_width = "32")))]
+    pub(super) const RTLD_DEFAULT: *mut c_void = ptr::null_mut();
+
+    extern "C" {
+        pub(super) fn dlsym(handle: *mut c_void, symbol: *const c_char) -> *mut c_void;
+    }
+
+    #[test]
+    fn test_abi() {
+        assert_eq!(self::RTLD_DEFAULT, ::libc::RTLD_DEFAULT);
+    }
+}
+
+unsafe fn fetch(name: &str) -> *mut c_void {
+    let name = match CStr::from_bytes_with_nul(name.as_bytes()) {
+        Ok(c_str) => c_str,
+        Err(..) => return null_mut(),
+    };
+    libc::dlsym(libc::RTLD_DEFAULT, name.as_ptr().cast())
+}
+
+#[cfg(not(linux_kernel))]
+macro_rules! syscall {
+    (fn $name:ident($($arg_name:ident: $t:ty),*) via $_sys_name:ident -> $ret:ty) => (
+        unsafe fn $name($($arg_name: $t),*) -> $ret {
+            weak! { fn $name($($t),*) -> $ret }
+
+            if let Some(fun) = $name.get() {
+                fun($($arg_name),*)
+            } else {
+                libc_errno::set_errno(libc_errno::Errno(libc::ENOSYS));
+                -1
+            }
+        }
+    )
+}
+
+#[cfg(linux_kernel)]
+macro_rules! syscall {
+    (fn $name:ident($($arg_name:ident: $t:ty),*) via $sys_name:ident -> $ret:ty) => (
+        unsafe fn $name($($arg_name:$t),*) -> $ret {
+            // This looks like a hack, but `concat_idents` only accepts idents
+            // (not paths).
+            use libc::*;
+
+            trait AsSyscallArg {
+                type SyscallArgType;
+                fn into_syscall_arg(self) -> Self::SyscallArgType;
+            }
+
+            // Pass pointer types as pointers, to preserve provenance.
+            impl<T> AsSyscallArg for *mut T {
+                type SyscallArgType = *mut T;
+                fn into_syscall_arg(self) -> Self::SyscallArgType { self }
+            }
+            impl<T> AsSyscallArg for *const T {
+                type SyscallArgType = *const T;
+                fn into_syscall_arg(self) -> Self::SyscallArgType { self }
+            }
+
+            // Pass `BorrowedFd` values as the integer value.
+            impl AsSyscallArg for $crate::fd::BorrowedFd<'_> {
+                type SyscallArgType = ::libc::c_int;
+                fn into_syscall_arg(self) -> Self::SyscallArgType {
+                    $crate::fd::AsRawFd::as_raw_fd(&self) as _
+                }
+            }
+
+            // Coerce integer values into `c_long`.
+            impl AsSyscallArg for i8 {
+                type SyscallArgType = ::libc::c_int;
+                fn into_syscall_arg(self) -> Self::SyscallArgType { self.into() }
+            }
+            impl AsSyscallArg for u8 {
+                type SyscallArgType = ::libc::c_int;
+                fn into_syscall_arg(self) -> Self::SyscallArgType { self.into() }
+            }
+            impl AsSyscallArg for i16 {
+                type SyscallArgType = ::libc::c_int;
+                fn into_syscall_arg(self) -> Self::SyscallArgType { self.into() }
+            }
+            impl AsSyscallArg for u16 {
+                type SyscallArgType = ::libc::c_int;
+                fn into_syscall_arg(self) -> Self::SyscallArgType { self.into() }
+            }
+            impl AsSyscallArg for i32 {
+                type SyscallArgType = ::libc::c_int;
+                fn into_syscall_arg(self) -> Self::SyscallArgType { self }
+            }
+            impl AsSyscallArg for u32 {
+                type SyscallArgType = ::libc::c_uint;
+                fn into_syscall_arg(self) -> Self::SyscallArgType { self }
+            }
+            impl AsSyscallArg for usize {
+                type SyscallArgType = ::libc::c_ulong;
+                fn into_syscall_arg(self) -> Self::SyscallArgType { self as _ }
+            }
+
+            // On 64-bit platforms, also coerce `i64` and `u64` since `c_long`
+            // is 64-bit and can hold those values.
+            #[cfg(target_pointer_width = "64")]
+            impl AsSyscallArg for i64 {
+                type SyscallArgType = ::libc::c_long;
+                fn into_syscall_arg(self) -> Self::SyscallArgType { self }
+            }
+            #[cfg(target_pointer_width = "64")]
+            impl AsSyscallArg for u64 {
+                type SyscallArgType = ::libc::c_ulong;
+                fn into_syscall_arg(self) -> Self::SyscallArgType { self }
+            }
+
+            // `concat_idents` is [unstable], so we take an extra `sys_name`
+            // parameter and have our users do the concat for us for now.
+            //
+            // [unstable]: https://github.com/rust-lang/rust/issues/29599
+            /*
+            syscall(
+                concat_idents!(SYS_, $name),
+                $($arg_name.into_syscall_arg()),*
+            ) as $ret
+            */
+
+            syscall($sys_name, $($arg_name.into_syscall_arg()),*) as $ret
+        }
+    )
+}
+
+macro_rules! weakcall {
+    ($vis:vis fn $name:ident($($arg_name:ident: $t:ty),*) -> $ret:ty) => (
+        $vis unsafe fn $name($($arg_name: $t),*) -> $ret {
+            weak! { fn $name($($t),*) -> $ret }
+
+            // Use a weak symbol from libc when possible, allowing `LD_PRELOAD`
+            // interposition, but if it's not found just fail.
+            if let Some(fun) = $name.get() {
+                fun($($arg_name),*)
+            } else {
+                libc_errno::set_errno(libc_errno::Errno(libc::ENOSYS));
+                -1
+            }
+        }
+    )
+}
+
+/// A combination of `weakcall` and `syscall`. Use the libc function if it's
+/// available, and fall back to `libc::syscall` otherwise.
+macro_rules! weak_or_syscall {
+    ($vis:vis fn $name:ident($($arg_name:ident: $t:ty),*) via $sys_name:ident -> $ret:ty) => (
+        $vis unsafe fn $name($($arg_name: $t),*) -> $ret {
+            weak! { fn $name($($t),*) -> $ret }
+
+            // Use a weak symbol from libc when possible, allowing `LD_PRELOAD`
+            // interposition, but if it's not found just fail.
+            if let Some(fun) = $name.get() {
+                fun($($arg_name),*)
+            } else {
+                syscall! { fn $name($($arg_name: $t),*) via $sys_name -> $ret }
+                $name($($arg_name),*)
+            }
+        }
+    )
+}