1 files changed, 318 insertions, 0 deletions
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))
+}