Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

9 files changed, 1681 insertions, 0 deletions

diff --git a/third_party/rust/mio/src/net/mod.rs b/third_party/rust/mio/src/net/mod.rs
new file mode 100644
index 0000000000..c8cef17e98
--- /dev/null
+++ b/third_party/rust/mio/src/net/mod.rs
@@ -0,0 +1,37 @@
+//! Networking primitives.
+//!
+//! The types provided in this module are non-blocking by default and are
+//! designed to be portable across all supported Mio platforms. As long as the
+//! [portability guidelines] are followed, the behavior should be identical no
+//! matter the target platform.
+//!
+//! [portability guidelines]: ../struct.Poll.html#portability
+//!
+//! # Notes
+//!
+//! When using a datagram based socket, i.e. [`UdpSocket`] or [`UnixDatagram`],
+//! its only possible to receive a packet once. This means that if you provide a
+//! buffer that is too small you won't be able to receive the data anymore. How
+//! OSs deal with this situation is different for each OS:
+//!  * Unixes, such as Linux, FreeBSD and macOS, will simply fill the buffer and
+//!    return the amount of bytes written. This means that if the returned value
+//!    is equal to the size of the buffer it may have only written a part of the
+//!    packet (or the packet has the same size as the buffer).
+//!  * Windows returns an `WSAEMSGSIZE` error.
+//!
+//! Mio does not change the value (either ok or error) returned by the OS, it's
+//! up to the user handle this. How to deal with these difference is still up
+//! for debate, specifically in
+//! <https://github.com/rust-lang/rust/issues/55794>. The best advice we can
+//! give is to always call receive with a large enough buffer.
+
+mod tcp;
+pub use self::tcp::{TcpListener, TcpStream};
+
+mod udp;
+pub use self::udp::UdpSocket;
+
+#[cfg(unix)]
+mod uds;
+#[cfg(unix)]
+pub use self::uds::{SocketAddr, UnixDatagram, UnixListener, UnixStream};
diff --git a/third_party/rust/mio/src/net/tcp/listener.rs b/third_party/rust/mio/src/net/tcp/listener.rs
new file mode 100644
index 0000000000..21bffbaffc
--- /dev/null
+++ b/third_party/rust/mio/src/net/tcp/listener.rs
@@ -0,0 +1,217 @@
+use std::net::{self, SocketAddr};
+#[cfg(unix)]
+use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+#[cfg(windows)]
+use std::os::windows::io::{AsRawSocket, FromRawSocket, IntoRawSocket, RawSocket};
+use std::{fmt, io};
+
+use crate::io_source::IoSource;
+use crate::net::TcpStream;
+#[cfg(unix)]
+use crate::sys::tcp::set_reuseaddr;
+use crate::sys::tcp::{bind, listen, new_for_addr};
+use crate::{event, sys, Interest, Registry, Token};
+
+/// A structure representing a socket server
+///
+/// # Examples
+///
+#[cfg_attr(feature = "os-poll", doc = "```")]
+#[cfg_attr(not(feature = "os-poll"), doc = "```ignore")]
+/// # use std::error::Error;
+/// # fn main() -> Result<(), Box<dyn Error>> {
+/// use mio::{Events, Interest, Poll, Token};
+/// use mio::net::TcpListener;
+/// use std::time::Duration;
+///
+/// let mut listener = TcpListener::bind("127.0.0.1:34255".parse()?)?;
+///
+/// let mut poll = Poll::new()?;
+/// let mut events = Events::with_capacity(128);
+///
+/// // Register the socket with `Poll`
+/// poll.registry().register(&mut listener, Token(0), Interest::READABLE)?;
+///
+/// poll.poll(&mut events, Some(Duration::from_millis(100)))?;
+///
+/// // There may be a socket ready to be accepted
+/// #     Ok(())
+/// # }
+/// ```
+pub struct TcpListener {
+    inner: IoSource<net::TcpListener>,
+}
+
+impl TcpListener {
+    /// Convenience method to bind a new TCP listener to the specified address
+    /// to receive new connections.
+    ///
+    /// This function will take the following steps:
+    ///
+    /// 1. Create a new TCP socket.
+    /// 2. Set the `SO_REUSEADDR` option on the socket on Unix.
+    /// 3. Bind the socket to the specified address.
+    /// 4. Calls `listen` on the socket to prepare it to receive new connections.
+    pub fn bind(addr: SocketAddr) -> io::Result<TcpListener> {
+        let socket = new_for_addr(addr)?;
+        #[cfg(unix)]
+        let listener = unsafe { TcpListener::from_raw_fd(socket) };
+        #[cfg(windows)]
+        let listener = unsafe { TcpListener::from_raw_socket(socket as _) };
+
+        // On platforms with Berkeley-derived sockets, this allows to quickly
+        // rebind a socket, without needing to wait for the OS to clean up the
+        // previous one.
+        //
+        // On Windows, this allows rebinding sockets which are actively in use,
+        // which allows “socket hijacking”, so we explicitly don't set it here.
+        // https://docs.microsoft.com/en-us/windows/win32/winsock/using-so-reuseaddr-and-so-exclusiveaddruse
+        #[cfg(not(windows))]
+        set_reuseaddr(&listener.inner, true)?;
+
+        bind(&listener.inner, addr)?;
+        listen(&listener.inner, 1024)?;
+        Ok(listener)
+    }
+
+    /// Creates a new `TcpListener` from a standard `net::TcpListener`.
+    ///
+    /// This function is intended to be used to wrap a TCP listener from the
+    /// standard library in the Mio equivalent. The conversion assumes nothing
+    /// about the underlying listener; ; it is left up to the user to set it
+    /// in non-blocking mode.
+    pub fn from_std(listener: net::TcpListener) -> TcpListener {
+        TcpListener {
+            inner: IoSource::new(listener),
+        }
+    }
+
+    /// Accepts a new `TcpStream`.
+    ///
+    /// This may return an `Err(e)` where `e.kind()` is
+    /// `io::ErrorKind::WouldBlock`. This means a stream may be ready at a later
+    /// point and one should wait for an event before calling `accept` again.
+    ///
+    /// If an accepted stream is returned, the remote address of the peer is
+    /// returned along with it.
+    pub fn accept(&self) -> io::Result<(TcpStream, SocketAddr)> {
+        self.inner.do_io(|inner| {
+            sys::tcp::accept(inner).map(|(stream, addr)| (TcpStream::from_std(stream), addr))
+        })
+    }
+
+    /// Returns the local socket address of this listener.
+    pub fn local_addr(&self) -> io::Result<SocketAddr> {
+        self.inner.local_addr()
+    }
+
+    /// Sets the value for the `IP_TTL` option on this socket.
+    ///
+    /// This value sets the time-to-live field that is used in every packet sent
+    /// from this socket.
+    pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
+        self.inner.set_ttl(ttl)
+    }
+
+    /// Gets the value of the `IP_TTL` option for this socket.
+    ///
+    /// For more information about this option, see [`set_ttl`][link].
+    ///
+    /// [link]: #method.set_ttl
+    pub fn ttl(&self) -> io::Result<u32> {
+        self.inner.ttl()
+    }
+
+    /// Get the value of the `SO_ERROR` option on this socket.
+    ///
+    /// This will retrieve the stored error in the underlying socket, clearing
+    /// the field in the process. This can be useful for checking errors between
+    /// calls.
+    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
+        self.inner.take_error()
+    }
+}
+
+impl event::Source for TcpListener {
+    fn register(
+        &mut self,
+        registry: &Registry,
+        token: Token,
+        interests: Interest,
+    ) -> io::Result<()> {
+        self.inner.register(registry, token, interests)
+    }
+
+    fn reregister(
+        &mut self,
+        registry: &Registry,
+        token: Token,
+        interests: Interest,
+    ) -> io::Result<()> {
+        self.inner.reregister(registry, token, interests)
+    }
+
+    fn deregister(&mut self, registry: &Registry) -> io::Result<()> {
+        self.inner.deregister(registry)
+    }
+}
+
+impl fmt::Debug for TcpListener {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.inner.fmt(f)
+    }
+}
+
+#[cfg(unix)]
+impl IntoRawFd for TcpListener {
+    fn into_raw_fd(self) -> RawFd {
+        self.inner.into_inner().into_raw_fd()
+    }
+}
+
+#[cfg(unix)]
+impl AsRawFd for TcpListener {
+    fn as_raw_fd(&self) -> RawFd {
+        self.inner.as_raw_fd()
+    }
+}
+
+#[cfg(unix)]
+impl FromRawFd for TcpListener {
+    /// Converts a `RawFd` to a `TcpListener`.
+    ///
+    /// # Notes
+    ///
+    /// The caller is responsible for ensuring that the socket is in
+    /// non-blocking mode.
+    unsafe fn from_raw_fd(fd: RawFd) -> TcpListener {
+        TcpListener::from_std(FromRawFd::from_raw_fd(fd))
+    }
+}
+
+#[cfg(windows)]
+impl IntoRawSocket for TcpListener {
+    fn into_raw_socket(self) -> RawSocket {
+        self.inner.into_inner().into_raw_socket()
+    }
+}
+
+#[cfg(windows)]
+impl AsRawSocket for TcpListener {
+    fn as_raw_socket(&self) -> RawSocket {
+        self.inner.as_raw_socket()
+    }
+}
+
+#[cfg(windows)]
+impl FromRawSocket for TcpListener {
+    /// Converts a `RawSocket` to a `TcpListener`.
+    ///
+    /// # Notes
+    ///
+    /// The caller is responsible for ensuring that the socket is in
+    /// non-blocking mode.
+    unsafe fn from_raw_socket(socket: RawSocket) -> TcpListener {
+        TcpListener::from_std(FromRawSocket::from_raw_socket(socket))
+    }
+}
diff --git a/third_party/rust/mio/src/net/tcp/mod.rs b/third_party/rust/mio/src/net/tcp/mod.rs
new file mode 100644
index 0000000000..94af5c10e8
--- /dev/null
+++ b/third_party/rust/mio/src/net/tcp/mod.rs
@@ -0,0 +1,5 @@
+mod listener;
+pub use self::listener::TcpListener;
+
+mod stream;
+pub use self::stream::TcpStream;
diff --git a/third_party/rust/mio/src/net/tcp/stream.rs b/third_party/rust/mio/src/net/tcp/stream.rs
new file mode 100644
index 0000000000..029f186b42
--- /dev/null
+++ b/third_party/rust/mio/src/net/tcp/stream.rs
@@ -0,0 +1,334 @@
+use std::fmt;
+use std::io::{self, IoSlice, IoSliceMut, Read, Write};
+use std::net::{self, Shutdown, SocketAddr};
+#[cfg(unix)]
+use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+#[cfg(windows)]
+use std::os::windows::io::{AsRawSocket, FromRawSocket, IntoRawSocket, RawSocket};
+
+use crate::io_source::IoSource;
+use crate::sys::tcp::{connect, new_for_addr};
+use crate::{event, Interest, Registry, Token};
+
+/// A non-blocking TCP stream between a local socket and a remote socket.
+///
+/// The socket will be closed when the value is dropped.
+///
+/// # Examples
+///
+#[cfg_attr(feature = "os-poll", doc = "```")]
+#[cfg_attr(not(feature = "os-poll"), doc = "```ignore")]
+/// # use std::net::{TcpListener, SocketAddr};
+/// # use std::error::Error;
+/// #
+/// # fn main() -> Result<(), Box<dyn Error>> {
+/// let address: SocketAddr = "127.0.0.1:0".parse()?;
+/// let listener = TcpListener::bind(address)?;
+/// use mio::{Events, Interest, Poll, Token};
+/// use mio::net::TcpStream;
+/// use std::time::Duration;
+///
+/// let mut stream = TcpStream::connect(listener.local_addr()?)?;
+///
+/// let mut poll = Poll::new()?;
+/// let mut events = Events::with_capacity(128);
+///
+/// // Register the socket with `Poll`
+/// poll.registry().register(&mut stream, Token(0), Interest::WRITABLE)?;
+///
+/// poll.poll(&mut events, Some(Duration::from_millis(100)))?;
+///
+/// // The socket might be ready at this point
+/// #     Ok(())
+/// # }
+/// ```
+pub struct TcpStream {
+    inner: IoSource<net::TcpStream>,
+}
+
+impl TcpStream {
+    /// Create a new TCP stream and issue a non-blocking connect to the
+    /// specified address.
+    ///
+    /// # Notes
+    ///
+    /// The returned `TcpStream` may not be connected (and thus usable), unlike
+    /// the API found in `std::net::TcpStream`. Because Mio issues a
+    /// *non-blocking* connect it will not block the thread and instead return
+    /// an unconnected `TcpStream`.
+    ///
+    /// Ensuring the returned stream is connected is surprisingly complex when
+    /// considering cross-platform support. Doing this properly should follow
+    /// the steps below, an example implementation can be found
+    /// [here](https://github.com/Thomasdezeeuw/heph/blob/0c4f1ab3eaf08bea1d65776528bfd6114c9f8374/src/net/tcp/stream.rs#L560-L622).
+    ///
+    ///  1. Call `TcpStream::connect`
+    ///  2. Register the returned stream with at least [read interest].
+    ///  3. Wait for a (readable) event.
+    ///  4. Check `TcpStream::peer_addr`. If it returns `libc::EINPROGRESS` or
+    ///     `ErrorKind::NotConnected` it means the stream is not yet connected,
+    ///     go back to step 3. If it returns an address it means the stream is
+    ///     connected, go to step 5. If another error is returned something
+    ///     whent wrong.
+    ///  5. Now the stream can be used.
+    ///
+    /// [read interest]: Interest::READABLE
+    pub fn connect(addr: SocketAddr) -> io::Result<TcpStream> {
+        let socket = new_for_addr(addr)?;
+        #[cfg(unix)]
+        let stream = unsafe { TcpStream::from_raw_fd(socket) };
+        #[cfg(windows)]
+        let stream = unsafe { TcpStream::from_raw_socket(socket as _) };
+        connect(&stream.inner, addr)?;
+        Ok(stream)
+    }
+
+    /// Creates a new `TcpStream` from a standard `net::TcpStream`.
+    ///
+    /// This function is intended to be used to wrap a TCP stream from the
+    /// standard library in the Mio equivalent. The conversion assumes nothing
+    /// about the underlying stream; it is left up to the user to set it in
+    /// non-blocking mode.
+    ///
+    /// # Note
+    ///
+    /// The TCP stream here will not have `connect` called on it, so it
+    /// should already be connected via some other means (be it manually, or
+    /// the standard library).
+    pub fn from_std(stream: net::TcpStream) -> TcpStream {
+        TcpStream {
+            inner: IoSource::new(stream),
+        }
+    }
+
+    /// Returns the socket address of the remote peer of this TCP connection.
+    pub fn peer_addr(&self) -> io::Result<SocketAddr> {
+        self.inner.peer_addr()
+    }
+
+    /// Returns the socket address of the local half of this TCP connection.
+    pub fn local_addr(&self) -> io::Result<SocketAddr> {
+        self.inner.local_addr()
+    }
+
+    /// Shuts down the read, write, or both halves of this connection.
+    ///
+    /// This function will cause all pending and future I/O on the specified
+    /// portions to return immediately with an appropriate value (see the
+    /// documentation of `Shutdown`).
+    pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
+        self.inner.shutdown(how)
+    }
+
+    /// Sets the value of the `TCP_NODELAY` option on this socket.
+    ///
+    /// If set, this option disables the Nagle algorithm. This means that
+    /// segments are always sent as soon as possible, even if there is only a
+    /// small amount of data. When not set, data is buffered until there is a
+    /// sufficient amount to send out, thereby avoiding the frequent sending of
+    /// small packets.
+    ///
+    /// # Notes
+    ///
+    /// On Windows make sure the stream is connected before calling this method,
+    /// by receiving an (writable) event. Trying to set `nodelay` on an
+    /// unconnected `TcpStream` is unspecified behavior.
+    pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> {
+        self.inner.set_nodelay(nodelay)
+    }
+
+    /// Gets the value of the `TCP_NODELAY` option on this socket.
+    ///
+    /// For more information about this option, see [`set_nodelay`][link].
+    ///
+    /// [link]: #method.set_nodelay
+    ///
+    /// # Notes
+    ///
+    /// On Windows make sure the stream is connected before calling this method,
+    /// by receiving an (writable) event. Trying to get `nodelay` on an
+    /// unconnected `TcpStream` is unspecified behavior.
+    pub fn nodelay(&self) -> io::Result<bool> {
+        self.inner.nodelay()
+    }
+
+    /// Sets the value for the `IP_TTL` option on this socket.
+    ///
+    /// This value sets the time-to-live field that is used in every packet sent
+    /// from this socket.
+    ///
+    /// # Notes
+    ///
+    /// On Windows make sure the stream is connected before calling this method,
+    /// by receiving an (writable) event. Trying to set `ttl` on an
+    /// unconnected `TcpStream` is unspecified behavior.
+    pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
+        self.inner.set_ttl(ttl)
+    }
+
+    /// Gets the value of the `IP_TTL` option for this socket.
+    ///
+    /// For more information about this option, see [`set_ttl`][link].
+    ///
+    /// # Notes
+    ///
+    /// On Windows make sure the stream is connected before calling this method,
+    /// by receiving an (writable) event. Trying to get `ttl` on an
+    /// unconnected `TcpStream` is unspecified behavior.
+    ///
+    /// [link]: #method.set_ttl
+    pub fn ttl(&self) -> io::Result<u32> {
+        self.inner.ttl()
+    }
+
+    /// Get the value of the `SO_ERROR` option on this socket.
+    ///
+    /// This will retrieve the stored error in the underlying socket, clearing
+    /// the field in the process. This can be useful for checking errors between
+    /// calls.
+    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
+        self.inner.take_error()
+    }
+
+    /// Receives data on the socket from the remote address to which it is
+    /// connected, without removing that data from the queue. On success,
+    /// returns the number of bytes peeked.
+    ///
+    /// Successive calls return the same data. This is accomplished by passing
+    /// `MSG_PEEK` as a flag to the underlying recv system call.
+    pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
+        self.inner.peek(buf)
+    }
+}
+
+impl Read for TcpStream {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).read(buf))
+    }
+
+    fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).read_vectored(bufs))
+    }
+}
+
+impl<'a> Read for &'a TcpStream {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).read(buf))
+    }
+
+    fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).read_vectored(bufs))
+    }
+}
+
+impl Write for TcpStream {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).write(buf))
+    }
+
+    fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).write_vectored(bufs))
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        self.inner.do_io(|inner| (&*inner).flush())
+    }
+}
+
+impl<'a> Write for &'a TcpStream {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).write(buf))
+    }
+
+    fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).write_vectored(bufs))
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        self.inner.do_io(|inner| (&*inner).flush())
+    }
+}
+
+impl event::Source for TcpStream {
+    fn register(
+        &mut self,
+        registry: &Registry,
+        token: Token,
+        interests: Interest,
+    ) -> io::Result<()> {
+        self.inner.register(registry, token, interests)
+    }
+
+    fn reregister(
+        &mut self,
+        registry: &Registry,
+        token: Token,
+        interests: Interest,
+    ) -> io::Result<()> {
+        self.inner.reregister(registry, token, interests)
+    }
+
+    fn deregister(&mut self, registry: &Registry) -> io::Result<()> {
+        self.inner.deregister(registry)
+    }
+}
+
+impl fmt::Debug for TcpStream {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.inner.fmt(f)
+    }
+}
+
+#[cfg(unix)]
+impl IntoRawFd for TcpStream {
+    fn into_raw_fd(self) -> RawFd {
+        self.inner.into_inner().into_raw_fd()
+    }
+}
+
+#[cfg(unix)]
+impl AsRawFd for TcpStream {
+    fn as_raw_fd(&self) -> RawFd {
+        self.inner.as_raw_fd()
+    }
+}
+
+#[cfg(unix)]
+impl FromRawFd for TcpStream {
+    /// Converts a `RawFd` to a `TcpStream`.
+    ///
+    /// # Notes
+    ///
+    /// The caller is responsible for ensuring that the socket is in
+    /// non-blocking mode.
+    unsafe fn from_raw_fd(fd: RawFd) -> TcpStream {
+        TcpStream::from_std(FromRawFd::from_raw_fd(fd))
+    }
+}
+
+#[cfg(windows)]
+impl IntoRawSocket for TcpStream {
+    fn into_raw_socket(self) -> RawSocket {
+        self.inner.into_inner().into_raw_socket()
+    }
+}
+
+#[cfg(windows)]
+impl AsRawSocket for TcpStream {
+    fn as_raw_socket(&self) -> RawSocket {
+        self.inner.as_raw_socket()
+    }
+}
+
+#[cfg(windows)]
+impl FromRawSocket for TcpStream {
+    /// Converts a `RawSocket` to a `TcpStream`.
+    ///
+    /// # Notes
+    ///
+    /// The caller is responsible for ensuring that the socket is in
+    /// non-blocking mode.
+    unsafe fn from_raw_socket(socket: RawSocket) -> TcpStream {
+        TcpStream::from_std(FromRawSocket::from_raw_socket(socket))
+    }
+}
diff --git a/third_party/rust/mio/src/net/udp.rs b/third_party/rust/mio/src/net/udp.rs
new file mode 100644
index 0000000000..8cfe4e456c
--- /dev/null
+++ b/third_party/rust/mio/src/net/udp.rs
@@ -0,0 +1,635 @@
+//! Primitives for working with UDP.
+//!
+//! The types provided in this module are non-blocking by default and are
+//! designed to be portable across all supported Mio platforms. As long as the
+//! [portability guidelines] are followed, the behavior should be identical no
+//! matter the target platform.
+//!
+//! [portability guidelines]: ../struct.Poll.html#portability
+
+use crate::io_source::IoSource;
+use crate::{event, sys, Interest, Registry, Token};
+
+use std::fmt;
+use std::io;
+use std::net;
+use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr};
+#[cfg(unix)]
+use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+#[cfg(windows)]
+use std::os::windows::io::{AsRawSocket, FromRawSocket, IntoRawSocket, RawSocket};
+
+/// A User Datagram Protocol socket.
+///
+/// This is an implementation of a bound UDP socket. This supports both IPv4 and
+/// IPv6 addresses, and there is no corresponding notion of a server because UDP
+/// is a datagram protocol.
+///
+/// # Examples
+///
+#[cfg_attr(feature = "os-poll", doc = "```")]
+#[cfg_attr(not(feature = "os-poll"), doc = "```ignore")]
+/// # use std::error::Error;
+/// #
+/// # fn main() -> Result<(), Box<dyn Error>> {
+/// // An Echo program:
+/// // SENDER -> sends a message.
+/// // ECHOER -> listens and prints the message received.
+///
+/// use mio::net::UdpSocket;
+/// use mio::{Events, Interest, Poll, Token};
+/// use std::time::Duration;
+///
+/// const SENDER: Token = Token(0);
+/// const ECHOER: Token = Token(1);
+///
+/// // This operation will fail if the address is in use, so we select different ports for each
+/// // socket.
+/// let mut sender_socket = UdpSocket::bind("127.0.0.1:0".parse()?)?;
+/// let mut echoer_socket = UdpSocket::bind("127.0.0.1:0".parse()?)?;
+///
+/// // If we do not use connect here, SENDER and ECHOER would need to call send_to and recv_from
+/// // respectively.
+/// sender_socket.connect(echoer_socket.local_addr()?)?;
+///
+/// // We need a Poll to check if SENDER is ready to be written into, and if ECHOER is ready to be
+/// // read from.
+/// let mut poll = Poll::new()?;
+///
+/// // We register our sockets here so that we can check if they are ready to be written/read.
+/// poll.registry().register(&mut sender_socket, SENDER, Interest::WRITABLE)?;
+/// poll.registry().register(&mut echoer_socket, ECHOER, Interest::READABLE)?;
+///
+/// let msg_to_send = [9; 9];
+/// let mut buffer = [0; 9];
+///
+/// let mut events = Events::with_capacity(128);
+/// loop {
+///     poll.poll(&mut events, Some(Duration::from_millis(100)))?;
+///     for event in events.iter() {
+///         match event.token() {
+///             // Our SENDER is ready to be written into.
+///             SENDER => {
+///                 let bytes_sent = sender_socket.send(&msg_to_send)?;
+///                 assert_eq!(bytes_sent, 9);
+///                 println!("sent {:?} -> {:?} bytes", msg_to_send, bytes_sent);
+///             },
+///             // Our ECHOER is ready to be read from.
+///             ECHOER => {
+///                 let num_recv = echoer_socket.recv(&mut buffer)?;
+///                 println!("echo {:?} -> {:?}", buffer, num_recv);
+///                 buffer = [0; 9];
+///                 # drop(buffer); // Silence unused assignment warning.
+///                 # return Ok(());
+///             }
+///             _ => unreachable!()
+///         }
+///     }
+/// }
+/// # }
+/// ```
+pub struct UdpSocket {
+    inner: IoSource<net::UdpSocket>,
+}
+
+impl UdpSocket {
+    /// Creates a UDP socket from the given address.
+    ///
+    /// # Examples
+    ///
+    #[cfg_attr(feature = "os-poll", doc = "```")]
+    #[cfg_attr(not(feature = "os-poll"), doc = "```ignore")]
+    /// # use std::error::Error;
+    /// #
+    /// # fn main() -> Result<(), Box<dyn Error>> {
+    /// use mio::net::UdpSocket;
+    ///
+    /// // We must bind it to an open address.
+    /// let socket = match UdpSocket::bind("127.0.0.1:0".parse()?) {
+    ///     Ok(new_socket) => new_socket,
+    ///     Err(fail) => {
+    ///         // We panic! here, but you could try to bind it again on another address.
+    ///         panic!("Failed to bind socket. {:?}", fail);
+    ///     }
+    /// };
+    ///
+    /// // Our socket was created, but we should not use it before checking it's readiness.
+    /// #    drop(socket); // Silence unused variable warning.
+    /// #    Ok(())
+    /// # }
+    /// ```
+    pub fn bind(addr: SocketAddr) -> io::Result<UdpSocket> {
+        sys::udp::bind(addr).map(UdpSocket::from_std)
+    }
+
+    /// Creates a new `UdpSocket` from a standard `net::UdpSocket`.
+    ///
+    /// This function is intended to be used to wrap a UDP socket from the
+    /// standard library in the Mio equivalent. The conversion assumes nothing
+    /// about the underlying socket; it is left up to the user to set it in
+    /// non-blocking mode.
+    pub fn from_std(socket: net::UdpSocket) -> UdpSocket {
+        UdpSocket {
+            inner: IoSource::new(socket),
+        }
+    }
+
+    /// Returns the socket address that this socket was created from.
+    ///
+    /// # Examples
+    ///
+    // This assertion is almost, but not quite, universal.  It fails on
+    // shared-IP FreeBSD jails.  It's hard for mio to know whether we're jailed,
+    // so simply disable the test on FreeBSD.
+    #[cfg_attr(all(feature = "os-poll", not(target_os = "freebsd")), doc = "```")]
+    #[cfg_attr(
+        any(not(feature = "os-poll"), target_os = "freebsd"),
+        doc = "```ignore"
+    )]
+    /// # use std::error::Error;
+    /// #
+    /// # fn main() -> Result<(), Box<dyn Error>> {
+    /// use mio::net::UdpSocket;
+    ///
+    /// let addr = "127.0.0.1:0".parse()?;
+    /// let socket = UdpSocket::bind(addr)?;
+    /// assert_eq!(socket.local_addr()?.ip(), addr.ip());
+    /// #    Ok(())
+    /// # }
+    /// ```
+    pub fn local_addr(&self) -> io::Result<SocketAddr> {
+        self.inner.local_addr()
+    }
+
+    /// Returns the socket address of the remote peer this socket was connected to.
+    ///
+    /// # Examples
+    ///
+    #[cfg_attr(feature = "os-poll", doc = "```")]
+    #[cfg_attr(not(feature = "os-poll"), doc = "```ignore")]
+    /// # use std::error::Error;
+    /// #
+    /// # fn main() -> Result<(), Box<dyn Error>> {
+    /// use mio::net::UdpSocket;
+    ///
+    /// let addr = "127.0.0.1:0".parse()?;
+    /// let peer_addr = "127.0.0.1:11100".parse()?;
+    /// let socket = UdpSocket::bind(addr)?;
+    /// socket.connect(peer_addr)?;
+    /// assert_eq!(socket.peer_addr()?.ip(), peer_addr.ip());
+    /// #    Ok(())
+    /// # }
+    /// ```
+    pub fn peer_addr(&self) -> io::Result<SocketAddr> {
+        self.inner.peer_addr()
+    }
+
+    /// Sends data on the socket to the given address. On success, returns the
+    /// number of bytes written.
+    ///
+    /// Address type can be any implementor of `ToSocketAddrs` trait. See its
+    /// documentation for concrete examples.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use std::error::Error;
+    /// # fn main() -> Result<(), Box<dyn Error>> {
+    /// use mio::net::UdpSocket;
+    ///
+    /// let socket = UdpSocket::bind("127.0.0.1:0".parse()?)?;
+    ///
+    /// // We must check if the socket is writable before calling send_to,
+    /// // or we could run into a WouldBlock error.
+    ///
+    /// let bytes_sent = socket.send_to(&[9; 9], "127.0.0.1:11100".parse()?)?;
+    /// assert_eq!(bytes_sent, 9);
+    /// #
+    /// #    Ok(())
+    /// # }
+    /// ```
+    pub fn send_to(&self, buf: &[u8], target: SocketAddr) -> io::Result<usize> {
+        self.inner.do_io(|inner| inner.send_to(buf, target))
+    }
+
+    /// Receives data from the socket. On success, returns the number of bytes
+    /// read and the address from whence the data came.
+    ///
+    /// # Notes
+    ///
+    /// On Windows, if the data is larger than the buffer specified, the buffer
+    /// is filled with the first part of the data, and recv_from returns the error
+    /// WSAEMSGSIZE(10040). The excess data is lost.
+    /// Make sure to always use a sufficiently large buffer to hold the
+    /// maximum UDP packet size, which can be up to 65536 bytes in size.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use std::error::Error;
+    /// #
+    /// # fn main() -> Result<(), Box<dyn Error>> {
+    /// use mio::net::UdpSocket;
+    ///
+    /// let socket = UdpSocket::bind("127.0.0.1:0".parse()?)?;
+    ///
+    /// // We must check if the socket is readable before calling recv_from,
+    /// // or we could run into a WouldBlock error.
+    ///
+    /// let mut buf = [0; 9];
+    /// let (num_recv, from_addr) = socket.recv_from(&mut buf)?;
+    /// println!("Received {:?} -> {:?} bytes from {:?}", buf, num_recv, from_addr);
+    /// #
+    /// #    Ok(())
+    /// # }
+    /// ```
+    pub fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
+        self.inner.do_io(|inner| inner.recv_from(buf))
+    }
+
+    /// Receives data from the socket, without removing it from the input queue.
+    /// On success, returns the number of bytes read and the address from whence
+    /// the data came.
+    ///
+    /// # Notes
+    ///
+    /// On Windows, if the data is larger than the buffer specified, the buffer
+    /// is filled with the first part of the data, and peek_from returns the error
+    /// WSAEMSGSIZE(10040). The excess data is lost.
+    /// Make sure to always use a sufficiently large buffer to hold the
+    /// maximum UDP packet size, which can be up to 65536 bytes in size.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use std::error::Error;
+    /// #
+    /// # fn main() -> Result<(), Box<dyn Error>> {
+    /// use mio::net::UdpSocket;
+    ///
+    /// let socket = UdpSocket::bind("127.0.0.1:0".parse()?)?;
+    ///
+    /// // We must check if the socket is readable before calling recv_from,
+    /// // or we could run into a WouldBlock error.
+    ///
+    /// let mut buf = [0; 9];
+    /// let (num_recv, from_addr) = socket.peek_from(&mut buf)?;
+    /// println!("Received {:?} -> {:?} bytes from {:?}", buf, num_recv, from_addr);
+    /// #
+    /// #    Ok(())
+    /// # }
+    /// ```
+    pub fn peek_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
+        self.inner.do_io(|inner| inner.peek_from(buf))
+    }
+
+    /// Sends data on the socket to the address previously bound via connect(). On success,
+    /// returns the number of bytes written.
+    pub fn send(&self, buf: &[u8]) -> io::Result<usize> {
+        self.inner.do_io(|inner| inner.send(buf))
+    }
+
+    /// Receives data from the socket previously bound with connect(). On success, returns
+    /// the number of bytes read.
+    ///
+    /// # Notes
+    ///
+    /// On Windows, if the data is larger than the buffer specified, the buffer
+    /// is filled with the first part of the data, and recv returns the error
+    /// WSAEMSGSIZE(10040). The excess data is lost.
+    /// Make sure to always use a sufficiently large buffer to hold the
+    /// maximum UDP packet size, which can be up to 65536 bytes in size.
+    pub fn recv(&self, buf: &mut [u8]) -> io::Result<usize> {
+        self.inner.do_io(|inner| inner.recv(buf))
+    }
+
+    /// Receives data from the socket, without removing it from the input queue.
+    /// On success, returns the number of bytes read.
+    ///
+    /// # Notes
+    ///
+    /// On Windows, if the data is larger than the buffer specified, the buffer
+    /// is filled with the first part of the data, and peek returns the error
+    /// WSAEMSGSIZE(10040). The excess data is lost.
+    /// Make sure to always use a sufficiently large buffer to hold the
+    /// maximum UDP packet size, which can be up to 65536 bytes in size.
+    pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
+        self.inner.do_io(|inner| inner.peek(buf))
+    }
+
+    /// Connects the UDP socket setting the default destination for `send()`
+    /// and limiting packets that are read via `recv` from the address specified
+    /// in `addr`.
+    pub fn connect(&self, addr: SocketAddr) -> io::Result<()> {
+        self.inner.connect(addr)
+    }
+
+    /// Sets the value of the `SO_BROADCAST` option for this socket.
+    ///
+    /// When enabled, this socket is allowed to send packets to a broadcast
+    /// address.
+    ///
+    /// # Examples
+    ///
+    #[cfg_attr(feature = "os-poll", doc = "```")]
+    #[cfg_attr(not(feature = "os-poll"), doc = "```ignore")]
+    /// # use std::error::Error;
+    /// #
+    /// # fn main() -> Result<(), Box<dyn Error>> {
+    /// use mio::net::UdpSocket;
+    ///
+    /// let broadcast_socket = UdpSocket::bind("127.0.0.1:0".parse()?)?;
+    /// if broadcast_socket.broadcast()? == false {
+    ///     broadcast_socket.set_broadcast(true)?;
+    /// }
+    ///
+    /// assert_eq!(broadcast_socket.broadcast()?, true);
+    /// #
+    /// #    Ok(())
+    /// # }
+    /// ```
+    pub fn set_broadcast(&self, on: bool) -> io::Result<()> {
+        self.inner.set_broadcast(on)
+    }
+
+    /// Gets the value of the `SO_BROADCAST` option for this socket.
+    ///
+    /// For more information about this option, see
+    /// [`set_broadcast`][link].
+    ///
+    /// [link]: #method.set_broadcast
+    ///
+    /// # Examples
+    ///
+    #[cfg_attr(feature = "os-poll", doc = "```")]
+    #[cfg_attr(not(feature = "os-poll"), doc = "```ignore")]
+    /// # use std::error::Error;
+    /// #
+    /// # fn main() -> Result<(), Box<dyn Error>> {
+    /// use mio::net::UdpSocket;
+    ///
+    /// let broadcast_socket = UdpSocket::bind("127.0.0.1:0".parse()?)?;
+    /// assert_eq!(broadcast_socket.broadcast()?, false);
+    /// #
+    /// #    Ok(())
+    /// # }
+    /// ```
+    pub fn broadcast(&self) -> io::Result<bool> {
+        self.inner.broadcast()
+    }
+
+    /// Sets the value of the `IP_MULTICAST_LOOP` option for this socket.
+    ///
+    /// If enabled, multicast packets will be looped back to the local socket.
+    /// Note that this may not have any affect on IPv6 sockets.
+    pub fn set_multicast_loop_v4(&self, on: bool) -> io::Result<()> {
+        self.inner.set_multicast_loop_v4(on)
+    }
+
+    /// Gets the value of the `IP_MULTICAST_LOOP` option for this socket.
+    ///
+    /// For more information about this option, see
+    /// [`set_multicast_loop_v4`][link].
+    ///
+    /// [link]: #method.set_multicast_loop_v4
+    pub fn multicast_loop_v4(&self) -> io::Result<bool> {
+        self.inner.multicast_loop_v4()
+    }
+
+    /// Sets the value of the `IP_MULTICAST_TTL` option for this socket.
+    ///
+    /// Indicates the time-to-live value of outgoing multicast packets for
+    /// this socket. The default value is 1 which means that multicast packets
+    /// don't leave the local network unless explicitly requested.
+    ///
+    /// Note that this may not have any affect on IPv6 sockets.
+    pub fn set_multicast_ttl_v4(&self, ttl: u32) -> io::Result<()> {
+        self.inner.set_multicast_ttl_v4(ttl)
+    }
+
+    /// Gets the value of the `IP_MULTICAST_TTL` option for this socket.
+    ///
+    /// For more information about this option, see
+    /// [`set_multicast_ttl_v4`][link].
+    ///
+    /// [link]: #method.set_multicast_ttl_v4
+    pub fn multicast_ttl_v4(&self) -> io::Result<u32> {
+        self.inner.multicast_ttl_v4()
+    }
+
+    /// Sets the value of the `IPV6_MULTICAST_LOOP` option for this socket.
+    ///
+    /// Controls whether this socket sees the multicast packets it sends itself.
+    /// Note that this may not have any affect on IPv4 sockets.
+    pub fn set_multicast_loop_v6(&self, on: bool) -> io::Result<()> {
+        self.inner.set_multicast_loop_v6(on)
+    }
+
+    /// Gets the value of the `IPV6_MULTICAST_LOOP` option for this socket.
+    ///
+    /// For more information about this option, see
+    /// [`set_multicast_loop_v6`][link].
+    ///
+    /// [link]: #method.set_multicast_loop_v6
+    pub fn multicast_loop_v6(&self) -> io::Result<bool> {
+        self.inner.multicast_loop_v6()
+    }
+
+    /// Sets the value for the `IP_TTL` option on this socket.
+    ///
+    /// This value sets the time-to-live field that is used in every packet sent
+    /// from this socket.
+    ///
+    /// # Examples
+    ///
+    #[cfg_attr(feature = "os-poll", doc = "```")]
+    #[cfg_attr(not(feature = "os-poll"), doc = "```ignore")]
+    /// # use std::error::Error;
+    /// #
+    /// # fn main() -> Result<(), Box<dyn Error>> {
+    /// use mio::net::UdpSocket;
+    ///
+    /// let socket = UdpSocket::bind("127.0.0.1:0".parse()?)?;
+    /// if socket.ttl()? < 255 {
+    ///     socket.set_ttl(255)?;
+    /// }
+    ///
+    /// assert_eq!(socket.ttl()?, 255);
+    /// #
+    /// #    Ok(())
+    /// # }
+    /// ```
+    pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
+        self.inner.set_ttl(ttl)
+    }
+
+    /// Gets the value of the `IP_TTL` option for this socket.
+    ///
+    /// For more information about this option, see [`set_ttl`][link].
+    ///
+    /// [link]: #method.set_ttl
+    ///
+    /// # Examples
+    ///
+    #[cfg_attr(feature = "os-poll", doc = "```")]
+    #[cfg_attr(not(feature = "os-poll"), doc = "```ignore")]
+    /// # use std::error::Error;
+    /// #
+    /// # fn main() -> Result<(), Box<dyn Error>> {
+    /// use mio::net::UdpSocket;
+    ///
+    /// let socket = UdpSocket::bind("127.0.0.1:0".parse()?)?;
+    /// socket.set_ttl(255)?;
+    ///
+    /// assert_eq!(socket.ttl()?, 255);
+    /// #
+    /// #    Ok(())
+    /// # }
+    /// ```
+    pub fn ttl(&self) -> io::Result<u32> {
+        self.inner.ttl()
+    }
+
+    /// Executes an operation of the `IP_ADD_MEMBERSHIP` type.
+    ///
+    /// This function specifies a new multicast group for this socket to join.
+    /// The address must be a valid multicast address, and `interface` is the
+    /// address of the local interface with which the system should join the
+    /// multicast group. If it's equal to `INADDR_ANY` then an appropriate
+    /// interface is chosen by the system.
+    #[allow(clippy::trivially_copy_pass_by_ref)]
+    pub fn join_multicast_v4(&self, multiaddr: &Ipv4Addr, interface: &Ipv4Addr) -> io::Result<()> {
+        self.inner.join_multicast_v4(multiaddr, interface)
+    }
+
+    /// Executes an operation of the `IPV6_ADD_MEMBERSHIP` type.
+    ///
+    /// This function specifies a new multicast group for this socket to join.
+    /// The address must be a valid multicast address, and `interface` is the
+    /// index of the interface to join/leave (or 0 to indicate any interface).
+    #[allow(clippy::trivially_copy_pass_by_ref)]
+    pub fn join_multicast_v6(&self, multiaddr: &Ipv6Addr, interface: u32) -> io::Result<()> {
+        self.inner.join_multicast_v6(multiaddr, interface)
+    }
+
+    /// Executes an operation of the `IP_DROP_MEMBERSHIP` type.
+    ///
+    /// For more information about this option, see
+    /// [`join_multicast_v4`][link].
+    ///
+    /// [link]: #method.join_multicast_v4
+    #[allow(clippy::trivially_copy_pass_by_ref)]
+    pub fn leave_multicast_v4(&self, multiaddr: &Ipv4Addr, interface: &Ipv4Addr) -> io::Result<()> {
+        self.inner.leave_multicast_v4(multiaddr, interface)
+    }
+
+    /// Executes an operation of the `IPV6_DROP_MEMBERSHIP` type.
+    ///
+    /// For more information about this option, see
+    /// [`join_multicast_v6`][link].
+    ///
+    /// [link]: #method.join_multicast_v6
+    #[allow(clippy::trivially_copy_pass_by_ref)]
+    pub fn leave_multicast_v6(&self, multiaddr: &Ipv6Addr, interface: u32) -> io::Result<()> {
+        self.inner.leave_multicast_v6(multiaddr, interface)
+    }
+
+    /// Get the value of the `IPV6_V6ONLY` option on this socket.
+    #[allow(clippy::trivially_copy_pass_by_ref)]
+    pub fn only_v6(&self) -> io::Result<bool> {
+        sys::udp::only_v6(&self.inner)
+    }
+
+    /// Get the value of the `SO_ERROR` option on this socket.
+    ///
+    /// This will retrieve the stored error in the underlying socket, clearing
+    /// the field in the process. This can be useful for checking errors between
+    /// calls.
+    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
+        self.inner.take_error()
+    }
+}
+
+impl event::Source for UdpSocket {
+    fn register(
+        &mut self,
+        registry: &Registry,
+        token: Token,
+        interests: Interest,
+    ) -> io::Result<()> {
+        self.inner.register(registry, token, interests)
+    }
+
+    fn reregister(
+        &mut self,
+        registry: &Registry,
+        token: Token,
+        interests: Interest,
+    ) -> io::Result<()> {
+        self.inner.reregister(registry, token, interests)
+    }
+
+    fn deregister(&mut self, registry: &Registry) -> io::Result<()> {
+        self.inner.deregister(registry)
+    }
+}
+
+impl fmt::Debug for UdpSocket {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.inner.fmt(f)
+    }
+}
+
+#[cfg(unix)]
+impl IntoRawFd for UdpSocket {
+    fn into_raw_fd(self) -> RawFd {
+        self.inner.into_inner().into_raw_fd()
+    }
+}
+
+#[cfg(unix)]
+impl AsRawFd for UdpSocket {
+    fn as_raw_fd(&self) -> RawFd {
+        self.inner.as_raw_fd()
+    }
+}
+
+#[cfg(unix)]
+impl FromRawFd for UdpSocket {
+    /// Converts a `RawFd` to a `UdpSocket`.
+    ///
+    /// # Notes
+    ///
+    /// The caller is responsible for ensuring that the socket is in
+    /// non-blocking mode.
+    unsafe fn from_raw_fd(fd: RawFd) -> UdpSocket {
+        UdpSocket::from_std(FromRawFd::from_raw_fd(fd))
+    }
+}
+
+#[cfg(windows)]
+impl IntoRawSocket for UdpSocket {
+    fn into_raw_socket(self) -> RawSocket {
+        self.inner.into_inner().into_raw_socket()
+    }
+}
+
+#[cfg(windows)]
+impl AsRawSocket for UdpSocket {
+    fn as_raw_socket(&self) -> RawSocket {
+        self.inner.as_raw_socket()
+    }
+}
+
+#[cfg(windows)]
+impl FromRawSocket for UdpSocket {
+    /// Converts a `RawSocket` to a `UdpSocket`.
+    ///
+    /// # Notes
+    ///
+    /// The caller is responsible for ensuring that the socket is in
+    /// non-blocking mode.
+    unsafe fn from_raw_socket(socket: RawSocket) -> UdpSocket {
+        UdpSocket::from_std(FromRawSocket::from_raw_socket(socket))
+    }
+}
diff --git a/third_party/rust/mio/src/net/uds/datagram.rs b/third_party/rust/mio/src/net/uds/datagram.rs
new file mode 100644
index 0000000000..0c8f5ffa6a
--- /dev/null
+++ b/third_party/rust/mio/src/net/uds/datagram.rs
@@ -0,0 +1,165 @@
+use crate::io_source::IoSource;
+use crate::{event, sys, Interest, Registry, Token};
+
+use std::net::Shutdown;
+use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+use std::os::unix::net;
+use std::path::Path;
+use std::{fmt, io};
+
+/// A Unix datagram socket.
+pub struct UnixDatagram {
+    inner: IoSource<net::UnixDatagram>,
+}
+
+impl UnixDatagram {
+    /// Creates a Unix datagram socket bound to the given path.
+    pub fn bind<P: AsRef<Path>>(path: P) -> io::Result<UnixDatagram> {
+        sys::uds::datagram::bind(path.as_ref()).map(UnixDatagram::from_std)
+    }
+
+    /// Creates a new `UnixDatagram` from a standard `net::UnixDatagram`.
+    ///
+    /// This function is intended to be used to wrap a Unix datagram from the
+    /// standard library in the Mio equivalent. The conversion assumes nothing
+    /// about the underlying datagram; ; it is left up to the user to set it
+    /// in non-blocking mode.
+    pub fn from_std(socket: net::UnixDatagram) -> UnixDatagram {
+        UnixDatagram {
+            inner: IoSource::new(socket),
+        }
+    }
+
+    /// Connects the socket to the specified address.
+    pub fn connect<P: AsRef<Path>>(&self, path: P) -> io::Result<()> {
+        self.inner.connect(path)
+    }
+
+    /// Creates a Unix Datagram socket which is not bound to any address.
+    pub fn unbound() -> io::Result<UnixDatagram> {
+        sys::uds::datagram::unbound().map(UnixDatagram::from_std)
+    }
+
+    /// Create an unnamed pair of connected sockets.
+    pub fn pair() -> io::Result<(UnixDatagram, UnixDatagram)> {
+        sys::uds::datagram::pair().map(|(socket1, socket2)| {
+            (
+                UnixDatagram::from_std(socket1),
+                UnixDatagram::from_std(socket2),
+            )
+        })
+    }
+
+    /// Returns the address of this socket.
+    pub fn local_addr(&self) -> io::Result<sys::SocketAddr> {
+        sys::uds::datagram::local_addr(&self.inner)
+    }
+
+    /// Returns the address of this socket's peer.
+    ///
+    /// The `connect` method will connect the socket to a peer.
+    pub fn peer_addr(&self) -> io::Result<sys::SocketAddr> {
+        sys::uds::datagram::peer_addr(&self.inner)
+    }
+
+    /// Receives data from the socket.
+    ///
+    /// On success, returns the number of bytes read and the address from
+    /// whence the data came.
+    pub fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, sys::SocketAddr)> {
+        self.inner
+            .do_io(|inner| sys::uds::datagram::recv_from(inner, buf))
+    }
+
+    /// Receives data from the socket.
+    ///
+    /// On success, returns the number of bytes read.
+    pub fn recv(&self, buf: &mut [u8]) -> io::Result<usize> {
+        self.inner.do_io(|inner| inner.recv(buf))
+    }
+
+    /// Sends data on the socket to the specified address.
+    ///
+    /// On success, returns the number of bytes written.
+    pub fn send_to<P: AsRef<Path>>(&self, buf: &[u8], path: P) -> io::Result<usize> {
+        self.inner.do_io(|inner| inner.send_to(buf, path))
+    }
+
+    /// Sends data on the socket to the socket's peer.
+    ///
+    /// The peer address may be set by the `connect` method, and this method
+    /// will return an error if the socket has not already been connected.
+    ///
+    /// On success, returns the number of bytes written.
+    pub fn send(&self, buf: &[u8]) -> io::Result<usize> {
+        self.inner.do_io(|inner| inner.send(buf))
+    }
+
+    /// Returns the value of the `SO_ERROR` option.
+    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
+        self.inner.take_error()
+    }
+
+    /// Shut down the read, write, or both halves of this connection.
+    ///
+    /// This function will cause all pending and future I/O calls on the
+    /// specified portions to immediately return with an appropriate value
+    /// (see the documentation of `Shutdown`).
+    pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
+        self.inner.shutdown(how)
+    }
+}
+
+impl event::Source for UnixDatagram {
+    fn register(
+        &mut self,
+        registry: &Registry,
+        token: Token,
+        interests: Interest,
+    ) -> io::Result<()> {
+        self.inner.register(registry, token, interests)
+    }
+
+    fn reregister(
+        &mut self,
+        registry: &Registry,
+        token: Token,
+        interests: Interest,
+    ) -> io::Result<()> {
+        self.inner.reregister(registry, token, interests)
+    }
+
+    fn deregister(&mut self, registry: &Registry) -> io::Result<()> {
+        self.inner.deregister(registry)
+    }
+}
+
+impl fmt::Debug for UnixDatagram {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.inner.fmt(f)
+    }
+}
+
+impl IntoRawFd for UnixDatagram {
+    fn into_raw_fd(self) -> RawFd {
+        self.inner.into_inner().into_raw_fd()
+    }
+}
+
+impl AsRawFd for UnixDatagram {
+    fn as_raw_fd(&self) -> RawFd {
+        self.inner.as_raw_fd()
+    }
+}
+
+impl FromRawFd for UnixDatagram {
+    /// Converts a `RawFd` to a `UnixDatagram`.
+    ///
+    /// # Notes
+    ///
+    /// The caller is responsible for ensuring that the socket is in
+    /// non-blocking mode.
+    unsafe fn from_raw_fd(fd: RawFd) -> UnixDatagram {
+        UnixDatagram::from_std(FromRawFd::from_raw_fd(fd))
+    }
+}
diff --git a/third_party/rust/mio/src/net/uds/listener.rs b/third_party/rust/mio/src/net/uds/listener.rs
new file mode 100644
index 0000000000..37e8106d89
--- /dev/null
+++ b/third_party/rust/mio/src/net/uds/listener.rs
@@ -0,0 +1,104 @@
+use crate::io_source::IoSource;
+use crate::net::{SocketAddr, UnixStream};
+use crate::{event, sys, Interest, Registry, Token};
+
+use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+use std::os::unix::net;
+use std::path::Path;
+use std::{fmt, io};
+
+/// A non-blocking Unix domain socket server.
+pub struct UnixListener {
+    inner: IoSource<net::UnixListener>,
+}
+
+impl UnixListener {
+    /// Creates a new `UnixListener` bound to the specified socket.
+    pub fn bind<P: AsRef<Path>>(path: P) -> io::Result<UnixListener> {
+        sys::uds::listener::bind(path.as_ref()).map(UnixListener::from_std)
+    }
+
+    /// Creates a new `UnixListener` from a standard `net::UnixListener`.
+    ///
+    /// This function is intended to be used to wrap a Unix listener from the
+    /// standard library in the Mio equivalent. The conversion assumes nothing
+    /// about the underlying listener; it is left up to the user to set it in
+    /// non-blocking mode.
+    pub fn from_std(listener: net::UnixListener) -> UnixListener {
+        UnixListener {
+            inner: IoSource::new(listener),
+        }
+    }
+
+    /// Accepts a new incoming connection to this listener.
+    ///
+    /// The call is responsible for ensuring that the listening socket is in
+    /// non-blocking mode.
+    pub fn accept(&self) -> io::Result<(UnixStream, SocketAddr)> {
+        sys::uds::listener::accept(&self.inner)
+    }
+
+    /// Returns the local socket address of this listener.
+    pub fn local_addr(&self) -> io::Result<sys::SocketAddr> {
+        sys::uds::listener::local_addr(&self.inner)
+    }
+
+    /// Returns the value of the `SO_ERROR` option.
+    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
+        self.inner.take_error()
+    }
+}
+
+impl event::Source for UnixListener {
+    fn register(
+        &mut self,
+        registry: &Registry,
+        token: Token,
+        interests: Interest,
+    ) -> io::Result<()> {
+        self.inner.register(registry, token, interests)
+    }
+
+    fn reregister(
+        &mut self,
+        registry: &Registry,
+        token: Token,
+        interests: Interest,
+    ) -> io::Result<()> {
+        self.inner.reregister(registry, token, interests)
+    }
+
+    fn deregister(&mut self, registry: &Registry) -> io::Result<()> {
+        self.inner.deregister(registry)
+    }
+}
+
+impl fmt::Debug for UnixListener {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.inner.fmt(f)
+    }
+}
+
+impl IntoRawFd for UnixListener {
+    fn into_raw_fd(self) -> RawFd {
+        self.inner.into_inner().into_raw_fd()
+    }
+}
+
+impl AsRawFd for UnixListener {
+    fn as_raw_fd(&self) -> RawFd {
+        self.inner.as_raw_fd()
+    }
+}
+
+impl FromRawFd for UnixListener {
+    /// Converts a `RawFd` to a `UnixListener`.
+    ///
+    /// # Notes
+    ///
+    /// The caller is responsible for ensuring that the socket is in
+    /// non-blocking mode.
+    unsafe fn from_raw_fd(fd: RawFd) -> UnixListener {
+        UnixListener::from_std(FromRawFd::from_raw_fd(fd))
+    }
+}
diff --git a/third_party/rust/mio/src/net/uds/mod.rs b/third_party/rust/mio/src/net/uds/mod.rs
new file mode 100644
index 0000000000..6b4ffdc430
--- /dev/null
+++ b/third_party/rust/mio/src/net/uds/mod.rs
@@ -0,0 +1,10 @@
+mod datagram;
+pub use self::datagram::UnixDatagram;
+
+mod listener;
+pub use self::listener::UnixListener;
+
+mod stream;
+pub use self::stream::UnixStream;
+
+pub use crate::sys::SocketAddr;
diff --git a/third_party/rust/mio/src/net/uds/stream.rs b/third_party/rust/mio/src/net/uds/stream.rs
new file mode 100644
index 0000000000..f21d9e7ba5
--- /dev/null
+++ b/third_party/rust/mio/src/net/uds/stream.rs
@@ -0,0 +1,174 @@
+use crate::io_source::IoSource;
+use crate::{event, sys, Interest, Registry, Token};
+
+use std::fmt;
+use std::io::{self, IoSlice, IoSliceMut, Read, Write};
+use std::net::Shutdown;
+use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+use std::os::unix::net;
+use std::path::Path;
+
+/// A non-blocking Unix stream socket.
+pub struct UnixStream {
+    inner: IoSource<net::UnixStream>,
+}
+
+impl UnixStream {
+    /// Connects to the socket named by `path`.
+    pub fn connect<P: AsRef<Path>>(path: P) -> io::Result<UnixStream> {
+        sys::uds::stream::connect(path.as_ref()).map(UnixStream::from_std)
+    }
+
+    /// Creates a new `UnixStream` from a standard `net::UnixStream`.
+    ///
+    /// This function is intended to be used to wrap a Unix stream from the
+    /// standard library in the Mio equivalent. The conversion assumes nothing
+    /// about the underlying stream; it is left up to the user to set it in
+    /// non-blocking mode.
+    ///
+    /// # Note
+    ///
+    /// The Unix stream here will not have `connect` called on it, so it
+    /// should already be connected via some other means (be it manually, or
+    /// the standard library).
+    pub fn from_std(stream: net::UnixStream) -> UnixStream {
+        UnixStream {
+            inner: IoSource::new(stream),
+        }
+    }
+
+    /// Creates an unnamed pair of connected sockets.
+    ///
+    /// Returns two `UnixStream`s which are connected to each other.
+    pub fn pair() -> io::Result<(UnixStream, UnixStream)> {
+        sys::uds::stream::pair().map(|(stream1, stream2)| {
+            (UnixStream::from_std(stream1), UnixStream::from_std(stream2))
+        })
+    }
+
+    /// Returns the socket address of the local half of this connection.
+    pub fn local_addr(&self) -> io::Result<sys::SocketAddr> {
+        sys::uds::stream::local_addr(&self.inner)
+    }
+
+    /// Returns the socket address of the remote half of this connection.
+    pub fn peer_addr(&self) -> io::Result<sys::SocketAddr> {
+        sys::uds::stream::peer_addr(&self.inner)
+    }
+
+    /// Returns the value of the `SO_ERROR` option.
+    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
+        self.inner.take_error()
+    }
+
+    /// Shuts down the read, write, or both halves of this connection.
+    ///
+    /// This function will cause all pending and future I/O calls on the
+    /// specified portions to immediately return with an appropriate value
+    /// (see the documentation of `Shutdown`).
+    pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
+        self.inner.shutdown(how)
+    }
+}
+
+impl Read for UnixStream {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).read(buf))
+    }
+
+    fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).read_vectored(bufs))
+    }
+}
+
+impl<'a> Read for &'a UnixStream {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).read(buf))
+    }
+
+    fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).read_vectored(bufs))
+    }
+}
+
+impl Write for UnixStream {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).write(buf))
+    }
+
+    fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).write_vectored(bufs))
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        self.inner.do_io(|inner| (&*inner).flush())
+    }
+}
+
+impl<'a> Write for &'a UnixStream {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).write(buf))
+    }
+
+    fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
+        self.inner.do_io(|inner| (&*inner).write_vectored(bufs))
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        self.inner.do_io(|inner| (&*inner).flush())
+    }
+}
+
+impl event::Source for UnixStream {
+    fn register(
+        &mut self,
+        registry: &Registry,
+        token: Token,
+        interests: Interest,
+    ) -> io::Result<()> {
+        self.inner.register(registry, token, interests)
+    }
+
+    fn reregister(
+        &mut self,
+        registry: &Registry,
+        token: Token,
+        interests: Interest,
+    ) -> io::Result<()> {
+        self.inner.reregister(registry, token, interests)
+    }
+
+    fn deregister(&mut self, registry: &Registry) -> io::Result<()> {
+        self.inner.deregister(registry)
+    }
+}
+
+impl fmt::Debug for UnixStream {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.inner.fmt(f)
+    }
+}
+
+impl IntoRawFd for UnixStream {
+    fn into_raw_fd(self) -> RawFd {
+        self.inner.into_inner().into_raw_fd()
+    }
+}
+
+impl AsRawFd for UnixStream {
+    fn as_raw_fd(&self) -> RawFd {
+        self.inner.as_raw_fd()
+    }
+}
+
+impl FromRawFd for UnixStream {
+    /// Converts a `RawFd` to a `UnixStream`.
+    ///
+    /// # Notes
+    ///
+    /// The caller is responsible for ensuring that the socket is in
+    /// non-blocking mode.
+    unsafe fn from_raw_fd(fd: RawFd) -> UnixStream {
+        UnixStream::from_std(FromRawFd::from_raw_fd(fd))
+    }
+}