Merging upstream version 1.67.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

8 files changed, 2651 insertions, 0 deletions

diff --git a/vendor/rustix/src/backend/libc/io/epoll.rs b/vendor/rustix/src/backend/libc/io/epoll.rs
new file mode 100644
index 000000000..3205a613f
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/io/epoll.rs
@@ -0,0 +1,573 @@
+//! epoll support.
+//!
+//! This is an experiment, and it isn't yet clear whether epoll is the right
+//! level of abstraction at which to introduce safety. But it works fairly well
+//! in simple examples 🙂.
+//!
+//! # Examples
+//!
+//! ```rust,no_run
+//! # #![cfg_attr(io_lifetimes_use_std, feature(io_safety))]
+//! # #[cfg(feature = "net")]
+//! # fn main() -> std::io::Result<()> {
+//! use io_lifetimes::AsFd;
+//! use rustix::io::epoll::{self, Epoll};
+//! use rustix::io::{ioctl_fionbio, read, write};
+//! use rustix::net::{
+//!     accept, bind_v4, listen, socket, AddressFamily, Ipv4Addr, Protocol, SocketAddrV4,
+//!     SocketType,
+//! };
+//! use std::os::unix::io::AsRawFd;
+//!
+//! // Create a socket and listen on it.
+//! let listen_sock = socket(AddressFamily::INET, SocketType::STREAM, Protocol::default())?;
+//! 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::new(epoll::CreateFlags::CLOEXEC, epoll::Owning::new())?;
+//!
+//! // Remember the socket raw fd, which we use for comparisons only.
+//! let raw_listen_sock = listen_sock.as_fd().as_raw_fd();
+//!
+//! // Register the socket with the epoll object.
+//! epoll.add(listen_sock, epoll::EventFlags::IN)?;
+//!
+//! // Process events.
+//! let mut event_list = epoll::EventVec::with_capacity(4);
+//! loop {
+//!     epoll.wait(&mut event_list, -1)?;
+//!     for (_event_flags, target) in &event_list {
+//!         if target.as_raw_fd() == raw_listen_sock {
+//!             // 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(&*target)?;
+//!             ioctl_fionbio(&conn_sock, true)?;
+//!             epoll.add(conn_sock, epoll::EventFlags::OUT | epoll::EventFlags::ET)?;
+//!         } else {
+//!             // Write a message to the stream and then unregister it.
+//!             write(&*target, b"hello\n")?;
+//!             let _ = epoll.del(target)?;
+//!         }
+//!     }
+//! }
+//! # }
+//! # #[cfg(not(feature = "net"))]
+//! # fn main() {}
+//! ```
+
+use super::super::c;
+use super::super::conv::{ret, ret_owned_fd, ret_u32};
+use crate::fd::{AsFd, AsRawFd, BorrowedFd, OwnedFd, RawFd};
+#[cfg(not(feature = "rustc-dep-of-std"))]
+use crate::fd::{FromRawFd, IntoRawFd};
+use crate::io;
+use alloc::vec::Vec;
+use bitflags::bitflags;
+use core::convert::TryInto;
+use core::fmt;
+use core::marker::PhantomData;
+use core::ops::Deref;
+use core::ptr::{null, null_mut};
+
+bitflags! {
+    /// `EPOLL_*` for use with [`Epoll::new`].
+    pub struct CreateFlags: c::c_int {
+        /// `EPOLL_CLOEXEC`
+        const CLOEXEC = c::EPOLL_CLOEXEC;
+    }
+}
+
+bitflags! {
+    /// `EPOLL*` for use with [`Epoll::add`].
+    #[derive(Default)]
+    pub struct EventFlags: u32 {
+        /// `EPOLLIN`
+        const IN = c::EPOLLIN as u32;
+
+        /// `EPOLLOUT`
+        const OUT = c::EPOLLOUT as u32;
+
+        /// `EPOLLPRI`
+        const PRI = c::EPOLLPRI as u32;
+
+        /// `EPOLLERR`
+        const ERR = c::EPOLLERR as u32;
+
+        /// `EPOLLHUP`
+        const HUP = c::EPOLLHUP as u32;
+
+        /// `EPOLLET`
+        const ET = c::EPOLLET as u32;
+
+        /// `EPOLLONESHOT`
+        const ONESHOT = c::EPOLLONESHOT as u32;
+
+        /// `EPOLLWAKEUP`
+        const WAKEUP = c::EPOLLWAKEUP as u32;
+
+        /// `EPOLLEXCLUSIVE`
+        #[cfg(not(target_os = "android"))]
+        const EXCLUSIVE = c::EPOLLEXCLUSIVE as u32;
+    }
+}
+
+/// A reference to a `T`.
+pub struct Ref<'a, T> {
+    t: T,
+    _phantom: PhantomData<&'a T>,
+}
+
+impl<'a, T> Ref<'a, T> {
+    #[inline]
+    fn new(t: T) -> Self {
+        Self {
+            t,
+            _phantom: PhantomData,
+        }
+    }
+
+    #[inline]
+    fn consume(self) -> T {
+        self.t
+    }
+}
+
+impl<'a, T> Deref for Ref<'a, T> {
+    type Target = T;
+
+    #[inline]
+    fn deref(&self) -> &T {
+        &self.t
+    }
+}
+
+impl<'a, T: fmt::Debug> fmt::Debug for Ref<'a, T> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.t.fmt(fmt)
+    }
+}
+
+/// A trait for data stored within an [`Epoll`] instance.
+pub trait Context {
+    /// The type of an element owned by this context.
+    type Data;
+
+    /// The type of a value used to refer to an element owned by this context.
+    type Target: AsFd;
+
+    /// Assume ownership of `data`, and returning a `Target`.
+    fn acquire<'call>(&self, data: Self::Data) -> Ref<'call, Self::Target>;
+
+    /// Encode `target` as a `u64`. The only requirement on this value is that
+    /// it be decodable by `decode`.
+    fn encode(&self, target: Ref<'_, Self::Target>) -> u64;
+
+    /// Decode `raw`, which is a value encoded by `encode`, into a `Target`.
+    ///
+    /// # Safety
+    ///
+    /// `raw` must be a `u64` value returned from `encode`, from the same
+    /// context, and within the context's lifetime.
+    unsafe fn decode<'call>(&self, raw: u64) -> Ref<'call, Self::Target>;
+
+    /// Release ownership of the value referred to by `target` and return it.
+    fn release(&self, target: Ref<'_, Self::Target>) -> Self::Data;
+}
+
+/// A type implementing [`Context`] where the `Data` type is `BorrowedFd<'a>`.
+pub struct Borrowing<'a> {
+    _phantom: PhantomData<BorrowedFd<'a>>,
+}
+
+impl<'a> Context for Borrowing<'a> {
+    type Data = BorrowedFd<'a>;
+    type Target = BorrowedFd<'a>;
+
+    #[inline]
+    fn acquire<'call>(&self, data: Self::Data) -> Ref<'call, Self::Target> {
+        Ref::new(data)
+    }
+
+    #[inline]
+    fn encode(&self, target: Ref<'_, Self::Target>) -> u64 {
+        target.as_raw_fd() as u64
+    }
+
+    #[inline]
+    unsafe fn decode<'call>(&self, raw: u64) -> Ref<'call, Self::Target> {
+        Ref::new(BorrowedFd::<'a>::borrow_raw(raw as RawFd))
+    }
+
+    #[inline]
+    fn release(&self, target: Ref<'_, Self::Target>) -> Self::Data {
+        target.consume()
+    }
+}
+
+/// A type implementing [`Context`] where the `Data` type is `T`, a type
+/// implementing `From<OwnedFd>` and `From<T> for OwnedFd`.
+///
+/// This may be used with [`OwnedFd`], or higher-level types like
+/// [`std::fs::File`] or [`std::net::TcpStream`].
+#[cfg(not(feature = "rustc-dep-of-std"))]
+pub struct Owning<'context, T: Into<OwnedFd> + From<OwnedFd>> {
+    _phantom: PhantomData<&'context T>,
+}
+
+#[cfg(not(feature = "rustc-dep-of-std"))]
+impl<'context, T: Into<OwnedFd> + From<OwnedFd>> Owning<'context, T> {
+    /// Creates a new empty `Owning`.
+    #[allow(clippy::new_without_default)] // This is a specialized type that doesn't need to be generically constructible.
+    #[inline]
+    pub fn new() -> Self {
+        Self {
+            _phantom: PhantomData,
+        }
+    }
+}
+
+#[cfg(not(feature = "rustc-dep-of-std"))]
+impl<'context, T: AsFd + Into<OwnedFd> + From<OwnedFd>> Context for Owning<'context, T> {
+    type Data = T;
+    type Target = BorrowedFd<'context>;
+
+    #[inline]
+    fn acquire<'call>(&self, data: Self::Data) -> Ref<'call, Self::Target> {
+        let fd: OwnedFd = data.into();
+        let raw_fd = fd.into_raw_fd();
+        // Safety: `epoll` will assign ownership of the file descriptor to the
+        // kernel epoll object. We use `Into<OwnedFd>`+`IntoRawFd` to consume
+        // the `Data` and extract the raw file descriptor and then "borrow" it
+        // with `borrow_raw` knowing that the borrow won't outlive the
+        // kernel epoll object.
+        unsafe { Ref::new(BorrowedFd::<'context>::borrow_raw(raw_fd)) }
+    }
+
+    #[inline]
+    fn encode(&self, target: Ref<'_, Self::Target>) -> u64 {
+        target.as_fd().as_raw_fd() as u64
+    }
+
+    #[inline]
+    unsafe fn decode<'call>(&self, raw: u64) -> Ref<'call, Self::Target> {
+        Ref::new(BorrowedFd::<'context>::borrow_raw(raw as RawFd))
+    }
+
+    #[inline]
+    fn release(&self, target: Ref<'_, Self::Target>) -> Self::Data {
+        // The file descriptor was held by the kernel epoll object and is now
+        // being released, so we can create a new `OwnedFd` that assumes
+        // ownership.
+        let raw_fd = target.consume().as_raw_fd();
+        unsafe { T::from(OwnedFd::from_raw_fd(raw_fd).into()) }
+    }
+}
+
+/// An "epoll", an interface to an OS object allowing one to repeatedly wait
+/// for events from a set of file descriptors efficiently.
+pub struct Epoll<Context: self::Context> {
+    epoll_fd: OwnedFd,
+    context: Context,
+}
+
+impl<Context: self::Context> Epoll<Context> {
+    /// `epoll_create1(flags)`—Creates a new `Epoll`.
+    ///
+    /// 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 new(flags: CreateFlags, context: Context) -> io::Result<Self> {
+        // Safety: We're calling `epoll_create1` via FFI and we know how it
+        // behaves.
+        unsafe {
+            Ok(Self {
+                epoll_fd: ret_owned_fd(c::epoll_create1(flags.bits()))?,
+                context,
+            })
+        }
+    }
+
+    /// `epoll_ctl(self, EPOLL_CTL_ADD, data, event)`—Adds an element to an
+    /// `Epoll`.
+    ///
+    /// This registers interest in any of the events set in `events` occurring
+    /// on the file descriptor associated with `data`.
+    #[doc(alias = "epoll_ctl")]
+    pub fn add(
+        &self,
+        data: Context::Data,
+        event_flags: EventFlags,
+    ) -> io::Result<Ref<'_, Context::Target>> {
+        // Safety: We're calling `epoll_ctl` via FFI and we know how it
+        // behaves.
+        unsafe {
+            let target = self.context.acquire(data);
+            let raw_fd = target.as_fd().as_raw_fd();
+            let encoded = self.context.encode(target);
+            ret(c::epoll_ctl(
+                self.epoll_fd.as_fd().as_raw_fd(),
+                c::EPOLL_CTL_ADD,
+                raw_fd,
+                &mut c::epoll_event {
+                    events: event_flags.bits(),
+                    r#u64: encoded,
+                },
+            ))?;
+            Ok(self.context.decode(encoded))
+        }
+    }
+
+    /// `epoll_ctl(self, EPOLL_CTL_MOD, target, event)`—Modifies an element in
+    /// this `Epoll`.
+    ///
+    /// This sets the events of interest with `target` to `events`.
+    #[doc(alias = "epoll_ctl")]
+    pub fn mod_(
+        &self,
+        target: Ref<'_, Context::Target>,
+        event_flags: EventFlags,
+    ) -> io::Result<()> {
+        let raw_fd = target.as_fd().as_raw_fd();
+        let encoded = self.context.encode(target);
+        // Safety: We're calling `epoll_ctl` via FFI and we know how it
+        // behaves.
+        unsafe {
+            ret(c::epoll_ctl(
+                self.epoll_fd.as_fd().as_raw_fd(),
+                c::EPOLL_CTL_MOD,
+                raw_fd,
+                &mut c::epoll_event {
+                    events: event_flags.bits(),
+                    r#u64: encoded,
+                },
+            ))
+        }
+    }
+
+    /// `epoll_ctl(self, EPOLL_CTL_DEL, target, NULL)`—Removes an element in
+    /// this `Epoll`.
+    ///
+    /// This also returns the owning `Data`.
+    #[doc(alias = "epoll_ctl")]
+    pub fn del(&self, target: Ref<'_, Context::Target>) -> io::Result<Context::Data> {
+        // Safety: We're calling `epoll_ctl` via FFI and we know how it
+        // behaves.
+        unsafe {
+            let raw_fd = target.as_fd().as_raw_fd();
+            ret(c::epoll_ctl(
+                self.epoll_fd.as_fd().as_raw_fd(),
+                c::EPOLL_CTL_DEL,
+                raw_fd,
+                null_mut(),
+            ))?;
+        }
+        Ok(self.context.release(target))
+    }
+
+    /// `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.
+    #[doc(alias = "epoll_wait")]
+    pub fn wait<'context>(
+        &'context self,
+        event_list: &mut EventVec<'context, Context>,
+        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(
+                self.epoll_fd.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);
+            event_list.context = &self.context;
+        }
+
+        Ok(())
+    }
+}
+
+#[cfg(not(feature = "rustc-dep-of-std"))]
+impl<'context, T: AsFd + Into<OwnedFd> + From<OwnedFd>> AsRawFd for Epoll<Owning<'context, T>> {
+    fn as_raw_fd(&self) -> RawFd {
+        self.epoll_fd.as_raw_fd()
+    }
+}
+
+#[cfg(not(feature = "rustc-dep-of-std"))]
+impl<'context, T: AsFd + Into<OwnedFd> + From<OwnedFd>> IntoRawFd for Epoll<Owning<'context, T>> {
+    fn into_raw_fd(self) -> RawFd {
+        self.epoll_fd.into_raw_fd()
+    }
+}
+
+#[cfg(not(feature = "rustc-dep-of-std"))]
+impl<'context, T: AsFd + Into<OwnedFd> + From<OwnedFd>> FromRawFd for Epoll<Owning<'context, T>> {
+    unsafe fn from_raw_fd(fd: RawFd) -> Self {
+        Self {
+            epoll_fd: OwnedFd::from_raw_fd(fd),
+            context: Owning::new(),
+        }
+    }
+}
+
+#[cfg(not(feature = "rustc-dep-of-std"))]
+impl<'context, T: AsFd + Into<OwnedFd> + From<OwnedFd>> AsFd for Epoll<Owning<'context, T>> {
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        self.epoll_fd.as_fd()
+    }
+}
+
+#[cfg(not(feature = "rustc-dep-of-std"))]
+impl<'context, T: AsFd + Into<OwnedFd> + From<OwnedFd>> From<Epoll<Owning<'context, T>>>
+    for OwnedFd
+{
+    fn from(epoll: Epoll<Owning<'context, T>>) -> Self {
+        epoll.epoll_fd
+    }
+}
+
+#[cfg(not(feature = "rustc-dep-of-std"))]
+impl<'context, T: AsFd + Into<OwnedFd> + From<OwnedFd>> From<OwnedFd>
+    for Epoll<Owning<'context, T>>
+{
+    fn from(fd: OwnedFd) -> Self {
+        Self {
+            epoll_fd: fd,
+            context: Owning::new(),
+        }
+    }
+}
+
+/// An iterator over the `Event`s in an `EventVec`.
+pub struct Iter<'context, Context: self::Context> {
+    iter: core::slice::Iter<'context, Event>,
+    context: *const Context,
+    _phantom: PhantomData<&'context Context>,
+}
+
+impl<'context, Context: self::Context> Iterator for Iter<'context, Context> {
+    type Item = (EventFlags, Ref<'context, Context::Target>);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        // Safety: `self.context` is guaranteed to be valid because we hold
+        // `'context` for it. And we know this event is associated with this
+        // context because `wait` sets both.
+        self.iter.next().map(|event| {
+            (event.event_flags, unsafe {
+                (*self.context).decode(event.encoded)
+            })
+        })
+    }
+}
+
+/// 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)
+)]
+struct Event {
+    // Match the layout of `c::epoll_event`. We just use a `u64` instead of
+    // the full union; `Context` implementations will simply need to deal with
+    // casting the value into and out of the `u64` themselves.
+    event_flags: EventFlags,
+    encoded: u64,
+}
+
+/// A vector of `Event`s, plus context for interpreting them.
+pub struct EventVec<'context, Context: self::Context> {
+    events: Vec<Event>,
+    context: *const Context,
+    _phantom: PhantomData<&'context Context>,
+}
+
+impl<'context, Context: self::Context> EventVec<'context, Context> {
+    /// Constructs an `EventVec` with memory for `capacity` `Event`s.
+    #[inline]
+    pub fn with_capacity(capacity: usize) -> Self {
+        Self {
+            events: Vec::with_capacity(capacity),
+            context: null(),
+            _phantom: PhantomData,
+        }
+    }
+
+    /// 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<'_, Context> {
+        Iter {
+            iter: self.events.iter(),
+            context: self.context,
+            _phantom: PhantomData,
+        }
+    }
+
+    /// 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()
+    }
+}
+
+impl<'context, Context: self::Context> IntoIterator for &'context EventVec<'context, Context> {
+    type IntoIter = Iter<'context, Context>;
+    type Item = (EventFlags, Ref<'context, Context::Target>);
+
+    #[inline]
+    fn into_iter(self) -> Self::IntoIter {
+        self.iter()
+    }
+}
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 000000000..131709e0c
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/io/errno.rs
@@ -0,0 +1,1106 @@
+//! The `rustix` `Errno` type.
+//!
+//! This type holds an OS error code, which conceptually corresponds to an
+//! `errno` value.
+
+use super::super::c;
+use libc_errno::errno;
+
+/// 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.
+#[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(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const ADV: Self = Self(c::EADV);
+    /// `EAFNOSUPPORT`
+    pub const AFNOSUPPORT: Self = Self(c::EAFNOSUPPORT);
+    /// `EAGAIN`
+    pub const AGAIN: Self = Self(c::EAGAIN);
+    /// `EALREADY`
+    pub const ALREADY: Self = Self(c::EALREADY);
+    /// `EAUTH`
+    #[cfg(any(
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    pub const AUTH: Self = Self(c::EAUTH);
+    /// `EBADE`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const BADE: Self = Self(c::EBADE);
+    /// `EBADF`
+    pub const BADF: Self = Self(c::EBADF);
+    /// `EBADFD`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const BADFD: Self = Self(c::EBADFD);
+    /// `EBADMSG`
+    #[cfg(not(windows))]
+    pub const BADMSG: Self = Self(c::EBADMSG);
+    /// `EBADR`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const BADR: Self = Self(c::EBADR);
+    /// `EBADRPC`
+    #[cfg(any(
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    pub const BADRPC: Self = Self(c::EBADRPC);
+    /// `EBADRQC`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const BADRQC: Self = Self(c::EBADRQC);
+    /// `EBADSLT`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const BADSLT: Self = Self(c::EBADSLT);
+    /// `EBFONT`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const BFONT: Self = Self(c::EBFONT);
+    /// `EBUSY`
+    #[cfg(not(windows))]
+    pub const BUSY: Self = Self(c::EBUSY);
+    /// `ECANCELED`
+    pub const CANCELED: Self = Self(c::ECANCELED);
+    /// `ECAPMODE`
+    #[cfg(any(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(
+        windows,
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const CHRNG: Self = Self(c::ECHRNG);
+    /// `ECOMM`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        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(
+        windows,
+        target_os = "aix",
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const DEADLOCK: Self = Self(c::EDEADLOCK);
+    /// `EDESTADDRREQ`
+    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(any(target_os = "dragonfly", target_os = "freebsd"))]
+    pub const DOOFUS: Self = Self(c::EDOOFUS);
+    /// `EDOTDOT`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "solaris",
+        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(
+        target_env = "newlib",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    pub const FTYPE: Self = Self(c::EFTYPE);
+    /// `EHOSTDOWN`
+    #[cfg(not(target_os = "wasi"))]
+    pub const HOSTDOWN: Self = Self(c::EHOSTDOWN);
+    /// `EHOSTUNREACH`
+    pub const HOSTUNREACH: Self = Self(c::EHOSTUNREACH);
+    /// `EHWPOISON`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "redox",
+        target_os = "solaris",
+        target_os = "wasi",
+    )))]
+    pub const HWPOISON: Self = Self(c::EHWPOISON);
+    /// `EIDRM`
+    #[cfg(not(windows))]
+    pub const IDRM: Self = Self(c::EIDRM);
+    /// `EILSEQ`
+    #[cfg(not(windows))]
+    pub const ILSEQ: Self = Self(c::EILSEQ);
+    /// `EINPROGRESS`
+    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`
+    pub const ISCONN: Self = Self(c::EISCONN);
+    /// `EISDIR`
+    #[cfg(not(windows))]
+    pub const ISDIR: Self = Self(c::EISDIR);
+    /// `EISNAM`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "solaris",
+        target_os = "wasi",
+    )))]
+    pub const ISNAM: Self = Self(c::EISNAM);
+    /// `EKEYEXPIRED`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "solaris",
+        target_os = "wasi",
+    )))]
+    pub const KEYEXPIRED: Self = Self(c::EKEYEXPIRED);
+    /// `EKEYREJECTED`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "solaris",
+        target_os = "wasi",
+    )))]
+    pub const KEYREJECTED: Self = Self(c::EKEYREJECTED);
+    /// `EKEYREVOKED`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "solaris",
+        target_os = "wasi",
+    )))]
+    pub const KEYREVOKED: Self = Self(c::EKEYREVOKED);
+    /// `EL2HLT`
+    #[cfg(not(any(
+        windows,
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const L2HLT: Self = Self(c::EL2HLT);
+    /// `EL2NSYNC`
+    #[cfg(not(any(
+        windows,
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const L2NSYNC: Self = Self(c::EL2NSYNC);
+    /// `EL3HLT`
+    #[cfg(not(any(
+        windows,
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const L3HLT: Self = Self(c::EL3HLT);
+    /// `EL3RST`
+    #[cfg(not(any(
+        windows,
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const L3RST: Self = Self(c::EL3RST);
+    /// `ELIBACC`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const LIBACC: Self = Self(c::ELIBACC);
+    /// `ELIBBAD`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const LIBBAD: Self = Self(c::ELIBBAD);
+    /// `ELIBEXEC`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const LIBEXEC: Self = Self(c::ELIBEXEC);
+    /// `ELIBMAX`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const LIBMAX: Self = Self(c::ELIBMAX);
+    /// `ELIBSCN`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const LIBSCN: Self = Self(c::ELIBSCN);
+    /// `ELNRNG`
+    #[cfg(not(any(
+        windows,
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const LNRNG: Self = Self(c::ELNRNG);
+    /// `ELOOP`
+    pub const LOOP: Self = Self(c::ELOOP);
+    /// `EMEDIUMTYPE`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "solaris",
+        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`
+    pub const MSGSIZE: Self = Self(c::EMSGSIZE);
+    /// `EMULTIHOP`
+    #[cfg(not(any(windows, target_os = "openbsd")))]
+    pub const MULTIHOP: Self = Self(c::EMULTIHOP);
+    /// `ENAMETOOLONG`
+    pub const NAMETOOLONG: Self = Self(c::ENAMETOOLONG);
+    /// `ENAVAIL`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "solaris",
+        target_os = "wasi",
+    )))]
+    pub const NAVAIL: Self = Self(c::ENAVAIL);
+    /// `ENEEDAUTH`
+    #[cfg(any(
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    pub const NEEDAUTH: Self = Self(c::ENEEDAUTH);
+    /// `ENETDOWN`
+    pub const NETDOWN: Self = Self(c::ENETDOWN);
+    /// `ENETRESET`
+    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(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const NOANO: Self = Self(c::ENOANO);
+    /// `ENOATTR`
+    #[cfg(any(
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    pub const NOATTR: Self = Self(c::ENOATTR);
+    /// `ENOBUFS`
+    pub const NOBUFS: Self = Self(c::ENOBUFS);
+    /// `ENOCSI`
+    #[cfg(not(any(
+        windows,
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const NOCSI: Self = Self(c::ENOCSI);
+    /// `ENODATA`
+    #[cfg(not(any(
+        windows,
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        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(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "solaris",
+        target_os = "wasi",
+    )))]
+    pub const NOKEY: Self = Self(c::ENOKEY);
+    /// `ENOLCK`
+    #[cfg(not(windows))]
+    pub const NOLCK: Self = Self(c::ENOLCK);
+    /// `ENOLINK`
+    #[cfg(not(any(windows, target_os = "openbsd")))]
+    pub const NOLINK: Self = Self(c::ENOLINK);
+    /// `ENOMEDIUM`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "solaris",
+        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(windows))]
+    pub const NOMSG: Self = Self(c::ENOMSG);
+    /// `ENONET`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const NONET: Self = Self(c::ENONET);
+    /// `ENOPKG`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const NOPKG: Self = Self(c::ENOPKG);
+    /// `ENOPROTOOPT`
+    pub const NOPROTOOPT: Self = Self(c::ENOPROTOOPT);
+    /// `ENOSPC`
+    #[cfg(not(windows))]
+    pub const NOSPC: Self = Self(c::ENOSPC);
+    /// `ENOSR`
+    #[cfg(not(any(
+        windows,
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const NOSR: Self = Self(c::ENOSR);
+    /// `ENOSTR`
+    #[cfg(not(any(
+        windows,
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        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 = "haiku", 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(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "solaris",
+        target_os = "wasi",
+    )))]
+    pub const NOTNAM: Self = Self(c::ENOTNAM);
+    /// `ENOTRECOVERABLE`
+    #[cfg(not(any(
+        windows,
+        target_os = "dragonfly",
+        target_os = "haiku",
+        target_os = "netbsd"
+    )))]
+    pub const NOTRECOVERABLE: Self = Self(c::ENOTRECOVERABLE);
+    /// `ENOTSOCK`
+    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(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        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(windows))]
+    pub const OVERFLOW: Self = Self(c::EOVERFLOW);
+    /// `EOWNERDEAD`
+    #[cfg(not(any(
+        windows,
+        target_os = "haiku",
+        target_os = "dragonfly",
+        target_os = "netbsd"
+    )))]
+    pub const OWNERDEAD: Self = Self(c::EOWNERDEAD);
+    /// `EPERM`
+    #[cfg(not(windows))]
+    pub const PERM: Self = Self(c::EPERM);
+    /// `EPFNOSUPPORT`
+    #[cfg(not(target_os = "wasi"))]
+    pub const PFNOSUPPORT: Self = Self(c::EPFNOSUPPORT);
+    /// `EPIPE`
+    #[cfg(not(windows))]
+    pub const PIPE: Self = Self(c::EPIPE);
+    /// `EPROCLIM`
+    #[cfg(any(
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    pub const PROCLIM: Self = Self(c::EPROCLIM);
+    /// `EPROCUNAVAIL`
+    #[cfg(any(
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    pub const PROCUNAVAIL: Self = Self(c::EPROCUNAVAIL);
+    /// `EPROGMISMATCH`
+    #[cfg(any(
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    pub const PROGMISMATCH: Self = Self(c::EPROGMISMATCH);
+    /// `EPROGUNAVAIL`
+    #[cfg(any(
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    pub const PROGUNAVAIL: Self = Self(c::EPROGUNAVAIL);
+    /// `EPROTO`
+    #[cfg(not(windows))]
+    pub const PROTO: Self = Self(c::EPROTO);
+    /// `EPROTONOSUPPORT`
+    pub const PROTONOSUPPORT: Self = Self(c::EPROTONOSUPPORT);
+    /// `EPROTOTYPE`
+    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(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const REMCHG: Self = Self(c::EREMCHG);
+    /// `EREMOTE`
+    #[cfg(not(any(target_os = "haiku", target_os = "wasi")))]
+    pub const REMOTE: Self = Self(c::EREMOTE);
+    /// `EREMOTEIO`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "solaris",
+        target_os = "wasi",
+    )))]
+    pub const REMOTEIO: Self = Self(c::EREMOTEIO);
+    /// `ERESTART`
+    #[cfg(not(any(
+        windows,
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const RESTART: Self = Self(c::ERESTART);
+    /// `ERFKILL`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "redox",
+        target_os = "solaris",
+        target_os = "wasi",
+    )))]
+    pub const RFKILL: Self = Self(c::ERFKILL);
+    /// `EROFS`
+    #[cfg(not(windows))]
+    pub const ROFS: Self = Self(c::EROFS);
+    /// `ERPCMISMATCH`
+    #[cfg(any(
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    pub const RPCMISMATCH: Self = Self(c::ERPCMISMATCH);
+    /// `ESHUTDOWN`
+    #[cfg(not(target_os = "wasi"))]
+    pub const SHUTDOWN: Self = Self(c::ESHUTDOWN);
+    /// `ESOCKTNOSUPPORT`
+    #[cfg(not(any(target_os = "haiku", 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(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const SRMNT: Self = Self(c::ESRMNT);
+    /// `ESTALE`
+    pub const STALE: Self = Self(c::ESTALE);
+    /// `ESTRPIPE`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const STRPIPE: Self = Self(c::ESTRPIPE);
+    /// `ETIME`
+    #[cfg(not(any(
+        windows,
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        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 = "wasi")))]
+    pub const TOOMANYREFS: Self = Self(c::ETOOMANYREFS);
+    /// `ETXTBSY`
+    #[cfg(not(windows))]
+    pub const TXTBSY: Self = Self(c::ETXTBSY);
+    /// `EUCLEAN`
+    #[cfg(not(any(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "illumos",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "solaris",
+        target_os = "wasi",
+    )))]
+    pub const UCLEAN: Self = Self(c::EUCLEAN);
+    /// `EUNATCH`
+    #[cfg(not(any(
+        windows,
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "wasi",
+    )))]
+    pub const UNATCH: Self = Self(c::EUNATCH);
+    /// `EUSERS`
+    #[cfg(not(any(target_os = "haiku", 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(
+        windows,
+        target_os = "aix",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "haiku",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        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/io_slice.rs b/vendor/rustix/src/backend/libc/io/io_slice.rs
new file mode 100644
index 000000000..de1ef434c
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/io/io_slice.rs
@@ -0,0 +1,87 @@
+//! The following is derived from Rust's
+//! library/std/src/sys/unix/io.rs
+//! dca3f1b786efd27be3b325ed1e01e247aa589c3b.
+
+#![allow(missing_docs)]
+
+use super::super::c;
+use core::marker::PhantomData;
+use core::slice;
+
+#[derive(Copy, Clone)]
+#[repr(transparent)]
+pub struct IoSlice<'a> {
+    vec: c::iovec,
+    _p: PhantomData<&'a [u8]>,
+}
+
+impl<'a> IoSlice<'a> {
+    #[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(),
+            },
+            _p: PhantomData,
+        }
+    }
+
+    #[inline]
+    pub fn advance(&mut self, n: usize) {
+        if self.vec.iov_len < n {
+            panic!("advancing IoSlice beyond its length");
+        }
+
+        unsafe {
+            self.vec.iov_len -= n;
+            self.vec.iov_base = self.vec.iov_base.add(n);
+        }
+    }
+
+    #[inline]
+    pub fn as_slice(&self) -> &[u8] {
+        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) }
+    }
+}
+
+#[repr(transparent)]
+pub struct IoSliceMut<'a> {
+    vec: c::iovec,
+    _p: PhantomData<&'a mut [u8]>,
+}
+
+impl<'a> IoSliceMut<'a> {
+    #[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(),
+            },
+            _p: PhantomData,
+        }
+    }
+
+    #[inline]
+    pub fn advance(&mut self, n: usize) {
+        if self.vec.iov_len < n {
+            panic!("advancing IoSliceMut beyond its length");
+        }
+
+        unsafe {
+            self.vec.iov_len -= n;
+            self.vec.iov_base = self.vec.iov_base.add(n);
+        }
+    }
+
+    #[inline]
+    pub fn as_slice(&self) -> &[u8] {
+        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) }
+    }
+
+    #[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) }
+    }
+}
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 000000000..1378adf3d
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/io/mod.rs
@@ -0,0 +1,13 @@
+pub(crate) mod errno;
+#[cfg(not(windows))]
+#[cfg(not(feature = "std"))]
+pub(crate) mod io_slice;
+pub(crate) mod poll_fd;
+#[cfg(not(windows))]
+pub(crate) mod types;
+
+#[cfg_attr(windows, path = "windows_syscalls.rs")]
+pub(crate) mod syscalls;
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+pub mod epoll;
diff --git a/vendor/rustix/src/backend/libc/io/poll_fd.rs b/vendor/rustix/src/backend/libc/io/poll_fd.rs
new file mode 100644
index 000000000..c516a9309
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/io/poll_fd.rs
@@ -0,0 +1,136 @@
+use super::super::c;
+use super::super::conv::borrowed_fd;
+#[cfg(windows)]
+use super::super::fd::RawFd;
+use super::super::fd::{AsFd, AsRawFd, BorrowedFd, LibcFd};
+use bitflags::bitflags;
+use core::marker::PhantomData;
+#[cfg(windows)]
+use std::fmt;
+
+bitflags! {
+    /// `POLL*` flags for use with [`poll`].
+    ///
+    /// [`poll`]: crate::io::poll
+    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`
+        #[cfg(not(target_os = "redox"))]
+        const RDNORM = c::POLLRDNORM;
+        /// `POLLWRNORM`
+        #[cfg(not(target_os = "redox"))]
+        const WRNORM = c::POLLWRNORM;
+        /// `POLLRDBAND`
+        #[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+        const RDBAND = c::POLLRDBAND;
+        /// `POLLWRBAND`
+        #[cfg(not(any(target_os = "redox", target_os = "wasi")))]
+        const WRBAND = c::POLLWRBAND;
+        /// `POLLERR`
+        const ERR = c::POLLERR;
+        /// `POLLHUP`
+        const HUP = c::POLLHUP;
+        /// `POLLNVAL`
+        const NVAL = c::POLLNVAL;
+        /// `POLLRDHUP`
+        #[cfg(all(
+            any(target_os = "android", target_os = "linux"),
+            not(any(target_arch = "sparc", target_arch = "sparc64"))),
+        )]
+        const RDHUP = c::POLLRDHUP;
+    }
+}
+
+/// `struct pollfd`—File descriptor and flags for use with [`poll`].
+///
+/// [`poll`]: crate::io::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> io_lifetimes::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/io/syscalls.rs b/vendor/rustix/src/backend/libc/io/syscalls.rs
new file mode 100644
index 000000000..3774e700a
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/io/syscalls.rs
@@ -0,0 +1,533 @@
+//! libc syscalls supporting `rustix::io`.
+
+use super::super::c;
+#[cfg(any(target_os = "android", target_os = "linux"))]
+use super::super::conv::syscall_ret_owned_fd;
+use super::super::conv::{
+    borrowed_fd, ret, ret_c_int, ret_discarded_fd, ret_owned_fd, ret_ssize_t,
+};
+use super::super::offset::{libc_pread, libc_pwrite};
+#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "solaris")))]
+use super::super::offset::{libc_preadv, libc_pwritev};
+#[cfg(all(target_os = "linux", target_env = "gnu"))]
+use super::super::offset::{libc_preadv2, libc_pwritev2};
+use crate::fd::{AsFd, BorrowedFd, OwnedFd, RawFd};
+#[cfg(not(any(target_os = "aix", target_os = "wasi")))]
+use crate::io::DupFlags;
+#[cfg(not(any(
+    target_os = "aix",
+    target_os = "haiku",
+    target_os = "ios",
+    target_os = "macos",
+    target_os = "wasi"
+)))]
+use crate::io::PipeFlags;
+use crate::io::{self, FdFlags, IoSlice, IoSliceMut, PollFd};
+#[cfg(any(target_os = "android", target_os = "linux"))]
+use crate::io::{EventfdFlags, IoSliceRaw, ReadWriteFlags, SpliceFlags};
+use core::cmp::min;
+use core::convert::TryInto;
+use core::mem::MaybeUninit;
+#[cfg(any(target_os = "android", target_os = "linux"))]
+use core::ptr;
+#[cfg(all(feature = "fs", feature = "net"))]
+use libc_errno::errno;
+
+pub(crate) fn read(fd: BorrowedFd<'_>, buf: &mut [u8]) -> io::Result<usize> {
+    let nread = unsafe {
+        ret_ssize_t(c::read(
+            borrowed_fd(fd),
+            buf.as_mut_ptr().cast(),
+            min(buf.len(), READ_LIMIT),
+        ))?
+    };
+    Ok(nread as usize)
+}
+
+pub(crate) fn write(fd: BorrowedFd<'_>, buf: &[u8]) -> io::Result<usize> {
+    let nwritten = unsafe {
+        ret_ssize_t(c::write(
+            borrowed_fd(fd),
+            buf.as_ptr().cast(),
+            min(buf.len(), READ_LIMIT),
+        ))?
+    };
+    Ok(nwritten as usize)
+}
+
+pub(crate) fn pread(fd: BorrowedFd<'_>, buf: &mut [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;
+
+    let nread = unsafe {
+        ret_ssize_t(libc_pread(
+            borrowed_fd(fd),
+            buf.as_mut_ptr().cast(),
+            len,
+            offset,
+        ))?
+    };
+    Ok(nread as usize)
+}
+
+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;
+
+    let nwritten = unsafe {
+        ret_ssize_t(libc_pwrite(
+            borrowed_fd(fd),
+            buf.as_ptr().cast(),
+            len,
+            offset,
+        ))?
+    };
+    Ok(nwritten as usize)
+}
+
+pub(crate) fn readv(fd: BorrowedFd<'_>, bufs: &mut [IoSliceMut]) -> io::Result<usize> {
+    let nread = unsafe {
+        ret_ssize_t(c::readv(
+            borrowed_fd(fd),
+            bufs.as_ptr().cast::<c::iovec>(),
+            min(bufs.len(), max_iov()) as c::c_int,
+        ))?
+    };
+    Ok(nread as usize)
+}
+
+pub(crate) fn writev(fd: BorrowedFd<'_>, bufs: &[IoSlice]) -> io::Result<usize> {
+    let nwritten = unsafe {
+        ret_ssize_t(c::writev(
+            borrowed_fd(fd),
+            bufs.as_ptr().cast::<c::iovec>(),
+            min(bufs.len(), max_iov()) as c::c_int,
+        ))?
+    };
+    Ok(nwritten as usize)
+}
+
+#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "solaris")))]
+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;
+    let nread = unsafe {
+        ret_ssize_t(libc_preadv(
+            borrowed_fd(fd),
+            bufs.as_ptr().cast::<c::iovec>(),
+            min(bufs.len(), max_iov()) as c::c_int,
+            offset,
+        ))?
+    };
+    Ok(nread as usize)
+}
+
+#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "solaris")))]
+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;
+    let nwritten = unsafe {
+        ret_ssize_t(libc_pwritev(
+            borrowed_fd(fd),
+            bufs.as_ptr().cast::<c::iovec>(),
+            min(bufs.len(), max_iov()) as c::c_int,
+            offset,
+        ))?
+    };
+    Ok(nwritten as usize)
+}
+
+#[cfg(all(target_os = "linux", target_env = "gnu"))]
+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;
+    let nread = unsafe {
+        ret_ssize_t(libc_preadv2(
+            borrowed_fd(fd),
+            bufs.as_ptr().cast::<c::iovec>(),
+            min(bufs.len(), max_iov()) as c::c_int,
+            offset,
+            flags.bits(),
+        ))?
+    };
+    Ok(nread as usize)
+}
+
+/// At present, `libc` only has `preadv2` defined for glibc. On other
+/// ABIs, `ReadWriteFlags` has no flags defined, and we use plain `preadv`.
+#[cfg(any(
+    target_os = "android",
+    all(target_os = "linux", not(target_env = "gnu")),
+))]
+#[inline]
+pub(crate) fn preadv2(
+    fd: BorrowedFd<'_>,
+    bufs: &mut [IoSliceMut],
+    offset: u64,
+    flags: ReadWriteFlags,
+) -> io::Result<usize> {
+    assert!(flags.is_empty());
+    preadv(fd, bufs, offset)
+}
+
+#[cfg(all(target_os = "linux", target_env = "gnu"))]
+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;
+    let nwritten = unsafe {
+        ret_ssize_t(libc_pwritev2(
+            borrowed_fd(fd),
+            bufs.as_ptr().cast::<c::iovec>(),
+            min(bufs.len(), max_iov()) as c::c_int,
+            offset,
+            flags.bits(),
+        ))?
+    };
+    Ok(nwritten as usize)
+}
+
+/// At present, `libc` only has `pwritev2` defined for glibc. On other
+/// ABIs, `ReadWriteFlags` has no flags defined, and we use plain `pwritev`.
+#[cfg(any(
+    target_os = "android",
+    all(target_os = "linux", not(target_env = "gnu")),
+))]
+#[inline]
+pub(crate) fn pwritev2(
+    fd: BorrowedFd<'_>,
+    bufs: &[IoSlice],
+    offset: u64,
+    flags: ReadWriteFlags,
+) -> io::Result<usize> {
+    assert!(flags.is_empty());
+    pwritev(fd, bufs, offset)
+}
+
+// These functions are derived from Rust's library/std/src/sys/unix/fd.rs at
+// revision a77da2d454e6caa227a85b16410b95f93495e7e0.
+
+// The maximum read limit on most POSIX-like systems is `SSIZE_MAX`, with the
+// man 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;
+
+#[cfg(any(
+    target_os = "dragonfly",
+    target_os = "freebsd",
+    target_os = "ios",
+    target_os = "macos",
+    target_os = "netbsd",
+    target_os = "openbsd",
+))]
+const fn max_iov() -> usize {
+    c::IOV_MAX as usize
+}
+
+#[cfg(any(target_os = "android", target_os = "emscripten", target_os = "linux"))]
+const fn max_iov() -> usize {
+    c::UIO_MAXIOV as usize
+}
+
+#[cfg(not(any(
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "freebsd",
+    target_os = "ios",
+    target_os = "linux",
+    target_os = "macos",
+    target_os = "netbsd",
+    target_os = "openbsd",
+)))]
+const fn max_iov() -> usize {
+    16 // The minimum value required by POSIX.
+}
+
+pub(crate) unsafe fn close(raw_fd: RawFd) {
+    let _ = c::close(raw_fd as c::c_int);
+}
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+pub(crate) fn eventfd(initval: u32, flags: EventfdFlags) -> io::Result<OwnedFd> {
+    unsafe { syscall_ret_owned_fd(c::syscall(c::SYS_eventfd2, initval, flags.bits())) }
+}
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+#[inline]
+pub(crate) fn ioctl_blksszget(fd: BorrowedFd) -> io::Result<u32> {
+    let mut result = MaybeUninit::<c::c_uint>::uninit();
+    unsafe {
+        ret(c::ioctl(borrowed_fd(fd), c::BLKSSZGET, result.as_mut_ptr()))?;
+        Ok(result.assume_init() as u32)
+    }
+}
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+#[inline]
+pub(crate) fn ioctl_blkpbszget(fd: BorrowedFd) -> io::Result<u32> {
+    let mut result = MaybeUninit::<c::c_uint>::uninit();
+    unsafe {
+        ret(c::ioctl(
+            borrowed_fd(fd),
+            c::BLKPBSZGET,
+            result.as_mut_ptr(),
+        ))?;
+        Ok(result.assume_init() as u32)
+    }
+}
+
+#[cfg(not(target_os = "redox"))]
+pub(crate) fn ioctl_fionread(fd: BorrowedFd<'_>) -> io::Result<u64> {
+    let mut nread = MaybeUninit::<c::c_int>::uninit();
+    unsafe {
+        ret(c::ioctl(borrowed_fd(fd), c::FIONREAD, nread.as_mut_ptr()))?;
+        // `FIONREAD` returns the number of bytes silently casted to a `c_int`,
+        // even when this is lossy. The best we can do is convert it back to a
+        // `u64` without sign-extending it back first.
+        Ok(u64::from(nread.assume_init() as c::c_uint))
+    }
+}
+
+pub(crate) fn ioctl_fionbio(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    unsafe {
+        let data = value as c::c_int;
+        ret(c::ioctl(borrowed_fd(fd), c::FIONBIO, &data))
+    }
+}
+
+#[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)> {
+    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> {
+    unsafe { ret_c_int(c::fcntl(borrowed_fd(fd), c::F_GETFD)).map(FdFlags::from_bits_truncate) }
+}
+
+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(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(not(target_os = "wasi"))]
+pub(crate) fn dup(fd: BorrowedFd<'_>) -> io::Result<OwnedFd> {
+    unsafe { ret_owned_fd(c::dup(borrowed_fd(fd))) }
+}
+
+#[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()))) }
+}
+
+#[cfg(not(any(
+    target_os = "aix",
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "haiku",
+    target_os = "ios",
+    target_os = "macos",
+    target_os = "redox",
+    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()),
+            flags.bits(),
+        ))
+    }
+}
+
+#[cfg(any(
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "haiku",
+    target_os = "ios",
+    target_os = "macos",
+    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)
+}
+
+#[cfg(any(target_os = "ios", target_os = "macos"))]
+pub(crate) fn ioctl_fioclex(fd: BorrowedFd<'_>) -> io::Result<()> {
+    unsafe { ret(c::ioctl(borrowed_fd(fd), c::FIOCLEX)) }
+}
+
+#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+pub(crate) fn ioctl_tiocexcl(fd: BorrowedFd) -> io::Result<()> {
+    unsafe { ret(c::ioctl(borrowed_fd(fd), c::TIOCEXCL as _)) }
+}
+
+#[cfg(not(any(target_os = "haiku", target_os = "redox", target_os = "wasi")))]
+pub(crate) fn ioctl_tiocnxcl(fd: BorrowedFd) -> io::Result<()> {
+    unsafe { ret(c::ioctl(borrowed_fd(fd), c::TIOCNXCL as _)) }
+}
+
+#[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(
+    target_os = "aix",
+    target_os = "haiku",
+    target_os = "ios",
+    target_os = "macos",
+    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>(), flags.bits()))?;
+        let [p0, p1] = result.assume_init();
+        Ok((p0, p1))
+    }
+}
+
+#[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(any(target_os = "android", target_os = "linux"))]
+#[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 = off_in
+        .map(|off| (off as *mut u64).cast())
+        .unwrap_or(ptr::null_mut());
+
+    let off_out = off_out
+        .map(|off| (off as *mut u64).cast())
+        .unwrap_or(ptr::null_mut());
+
+    ret_ssize_t(unsafe {
+        c::splice(
+            borrowed_fd(fd_in),
+            off_in,
+            borrowed_fd(fd_out),
+            off_out,
+            len,
+            flags.bits(),
+        )
+    })
+    .map(|spliced| spliced as usize)
+}
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+#[inline]
+pub unsafe fn vmsplice(
+    fd: BorrowedFd,
+    bufs: &[IoSliceRaw],
+    flags: SpliceFlags,
+) -> io::Result<usize> {
+    ret_ssize_t(c::vmsplice(
+        borrowed_fd(fd),
+        bufs.as_ptr().cast::<c::iovec>(),
+        min(bufs.len(), max_iov()),
+        flags.bits(),
+    ))
+    .map(|spliced| spliced as usize)
+}
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 000000000..46d5f6332
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/io/types.rs
@@ -0,0 +1,164 @@
+use super::super::c;
+use bitflags::bitflags;
+#[cfg(any(target_os = "android", target_os = "linux"))]
+use core::marker::PhantomData;
+
+bitflags! {
+    /// `FD_*` constants for use with [`fcntl_getfd`] and [`fcntl_setfd`].
+    ///
+    /// [`fcntl_getfd`]: crate::io::fcntl_getfd
+    /// [`fcntl_setfd`]: crate::io::fcntl_setfd
+    pub struct FdFlags: c::c_int {
+        /// `FD_CLOEXEC`
+        const CLOEXEC = c::FD_CLOEXEC;
+    }
+}
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+bitflags! {
+    /// `RWF_*` constants for use with [`preadv2`] and [`pwritev2`].
+    ///
+    /// [`preadv2`]: crate::io::preadv2
+    /// [`pwritev2`]: crate::io::pwritev
+    pub struct ReadWriteFlags: c::c_int {
+        /// `RWF_DSYNC` (since Linux 4.7)
+        #[cfg(all(target_os = "linux", target_env = "gnu"))]
+        const DSYNC = c::RWF_DSYNC;
+        /// `RWF_HIPRI` (since Linux 4.6)
+        #[cfg(all(target_os = "linux", target_env = "gnu"))]
+        const HIPRI = c::RWF_HIPRI;
+        /// `RWF_SYNC` (since Linux 4.7)
+        #[cfg(all(target_os = "linux", target_env = "gnu"))]
+        const SYNC = c::RWF_SYNC;
+        /// `RWF_NOWAIT` (since Linux 4.14)
+        #[cfg(all(target_os = "linux", target_env = "gnu"))]
+        const NOWAIT = c::RWF_NOWAIT;
+        /// `RWF_APPEND` (since Linux 4.16)
+        #[cfg(all(target_os = "linux", target_env = "gnu"))]
+        const APPEND = c::RWF_APPEND;
+    }
+}
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+bitflags! {
+    /// `SPLICE_F_*` constants for use with [`splice`] and [`vmsplice`].
+    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;
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
+bitflags! {
+    /// `O_*` constants for use with [`dup2`].
+    ///
+    /// [`dup2`]: crate::io::dup2
+    pub struct DupFlags: c::c_int {
+        /// `O_CLOEXEC`
+        #[cfg(not(any(
+            target_os = "android",
+            target_os = "ios",
+            target_os = "macos",
+            target_os = "redox",
+        )))] // Android 5.0 has dup3, but libc doesn't have bindings
+        const CLOEXEC = c::O_CLOEXEC;
+    }
+}
+
+#[cfg(not(any(target_os = "ios", target_os = "macos", target_os = "wasi")))]
+bitflags! {
+    /// `O_*` constants for use with [`pipe_with`].
+    ///
+    /// [`pipe_with`]: crate::io::pipe_with
+    pub struct PipeFlags: c::c_int {
+        /// `O_CLOEXEC`
+        const CLOEXEC = c::O_CLOEXEC;
+        /// `O_DIRECT`
+        #[cfg(not(any(
+            target_os = "haiku",
+            target_os = "illumos",
+            target_os = "openbsd",
+            target_os = "redox",
+            target_os = "solaris",
+        )))]
+        const DIRECT = c::O_DIRECT;
+        /// `O_NONBLOCK`
+        const NONBLOCK = c::O_NONBLOCK;
+    }
+}
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+bitflags! {
+    /// `EFD_*` flags for use with [`eventfd`].
+    ///
+    /// [`eventfd`]: crate::io::eventfd
+    pub struct EventfdFlags: c::c_int {
+        /// `EFD_CLOEXEC`
+        const CLOEXEC = c::EFD_CLOEXEC;
+        /// `EFD_NONBLOCK`
+        const NONBLOCK = c::EFD_NONBLOCK;
+        /// `EFD_SEMAPHORE`
+        const SEMAPHORE = c::EFD_SEMAPHORE;
+    }
+}
+
+/// `PIPE_BUF`—The maximum size of a write to a pipe guaranteed to be atomic.
+#[cfg(not(any(
+    target_os = "haiku",
+    target_os = "illumos",
+    target_os = "redox",
+    target_os = "solaris",
+    target_os = "wasi",
+)))]
+pub const PIPE_BUF: usize = c::PIPE_BUF;
+
+#[cfg(not(any(windows, target_os = "redox")))]
+pub(crate) const AT_FDCWD: c::c_int = c::AT_FDCWD;
+#[cfg(not(windows))]
+pub(crate) const STDIN_FILENO: c::c_int = c::STDIN_FILENO;
+#[cfg(not(windows))]
+pub(crate) const STDOUT_FILENO: c::c_int = c::STDOUT_FILENO;
+#[cfg(not(windows))]
+pub(crate) const STDERR_FILENO: c::c_int = c::STDERR_FILENO;
+
+/// A buffer type used 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.
+#[cfg(any(target_os = "android", target_os = "linux"))]
+#[repr(transparent)]
+pub struct IoSliceRaw<'a> {
+    _buf: c::iovec,
+    _lifetime: PhantomData<&'a ()>,
+}
+
+#[cfg(any(target_os = "android", target_os = "linux"))]
+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,
+        }
+    }
+}
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 000000000..4c6e86f94
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/io/windows_syscalls.rs
@@ -0,0 +1,39 @@
+//! Windows system calls in the `io` module.
+
+use super::super::c;
+use super::super::conv::{borrowed_fd, ret, ret_c_int};
+use super::super::fd::LibcFd;
+use crate::fd::{BorrowedFd, RawFd};
+use crate::io;
+use crate::io::PollFd;
+use core::convert::TryInto;
+use core::mem::MaybeUninit;
+
+pub(crate) unsafe fn close(raw_fd: RawFd) {
+    let _ = c::close(raw_fd as LibcFd);
+}
+
+pub(crate) fn ioctl_fionread(fd: BorrowedFd<'_>) -> io::Result<u64> {
+    let mut nread = MaybeUninit::<c::c_ulong>::uninit();
+    unsafe {
+        ret(c::ioctl(borrowed_fd(fd), c::FIONREAD, nread.as_mut_ptr()))?;
+        Ok(u64::from(nread.assume_init()))
+    }
+}
+
+pub(crate) fn ioctl_fionbio(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    unsafe {
+        let mut data = value as c::c_uint;
+        ret(c::ioctl(borrowed_fd(fd), c::FIONBIO, &mut data))
+    }
+}
+
+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)
+}