Initial vendor packages

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

5 files changed, 745 insertions, 0 deletions

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;
+    }
+}