Auto merge of #69864 - LinkTed:master, r=Amanieu

unix: Extend UnixStream and UnixDatagram to send and receive file descriptors

Add the functions `recv_vectored_fds` and `send_vectored_fds` to `UnixDatagram` and `UnixStream`. With this functions `UnixDatagram` and `UnixStream` can send and receive file descriptors, by using `recvmsg` and `sendmsg` system call.

11 files changed, 3098 insertions, 1771 deletions

diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index f33804c988a..83eb847697d 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -301,6 +301,7 @@
 #![feature(rustc_private)]
 #![feature(shrink_to)]
 #![feature(slice_concat_ext)]
+#![feature(slice_fill)]
 #![feature(slice_internals)]
 #![feature(slice_ptr_get)]
 #![feature(slice_ptr_len)]
diff --git a/library/std/src/sys/unix/ext/net.rs b/library/std/src/sys/unix/ext/net.rs
deleted file mode 100644
index 3d2366554b5..00000000000
--- a/library/std/src/sys/unix/ext/net.rs
+++ /dev/null
@@ -1,1768 +0,0 @@
-//! Unix-specific networking functionality.
-
-#![stable(feature = "unix_socket", since = "1.10.0")]
-
-#[cfg(all(test, not(target_os = "emscripten")))]
-mod tests;
-
-// FIXME(#43348): Make libc adapt #[doc(cfg(...))] so we don't need these fake definitions here?
-#[cfg(not(unix))]
-#[allow(non_camel_case_types)]
-mod libc {
-    pub use libc::c_int;
-    pub type socklen_t = u32;
-    pub struct sockaddr;
-    #[derive(Clone)]
-    pub struct sockaddr_un;
-}
-
-use crate::ascii;
-use crate::ffi::OsStr;
-use crate::fmt;
-use crate::io::{self, Initializer, IoSlice, IoSliceMut};
-use crate::mem;
-use crate::net::{self, Shutdown};
-use crate::os::unix::ffi::OsStrExt;
-use crate::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
-use crate::path::Path;
-use crate::sys::net::Socket;
-use crate::sys::{self, cvt};
-use crate::sys_common::{self, AsInner, FromInner, IntoInner};
-use crate::time::Duration;
-
-#[cfg(any(
-    target_os = "android",
-    target_os = "linux",
-    target_os = "dragonfly",
-    target_os = "freebsd",
-    target_os = "ios",
-    target_os = "macos",
-    target_os = "openbsd"
-))]
-use crate::os::unix::ucred;
-
-#[unstable(feature = "peer_credentials_unix_socket", issue = "42839", reason = "unstable")]
-#[cfg(any(
-    target_os = "android",
-    target_os = "linux",
-    target_os = "dragonfly",
-    target_os = "freebsd",
-    target_os = "ios",
-    target_os = "macos",
-    target_os = "openbsd"
-))]
-pub use ucred::UCred;
-
-#[cfg(any(
-    target_os = "linux",
-    target_os = "android",
-    target_os = "dragonfly",
-    target_os = "freebsd",
-    target_os = "openbsd",
-    target_os = "netbsd",
-    target_os = "haiku"
-))]
-use libc::MSG_NOSIGNAL;
-#[cfg(not(any(
-    target_os = "linux",
-    target_os = "android",
-    target_os = "dragonfly",
-    target_os = "freebsd",
-    target_os = "openbsd",
-    target_os = "netbsd",
-    target_os = "haiku"
-)))]
-const MSG_NOSIGNAL: libc::c_int = 0x0;
-
-fn sun_path_offset(addr: &libc::sockaddr_un) -> usize {
-    // Work with an actual instance of the type since using a null pointer is UB
-    let base = addr as *const _ as usize;
-    let path = &addr.sun_path as *const _ as usize;
-    path - base
-}
-
-unsafe fn sockaddr_un(path: &Path) -> io::Result<(libc::sockaddr_un, libc::socklen_t)> {
-    let mut addr: libc::sockaddr_un = mem::zeroed();
-    addr.sun_family = libc::AF_UNIX as libc::sa_family_t;
-
-    let bytes = path.as_os_str().as_bytes();
-
-    if bytes.contains(&0) {
-        return Err(io::Error::new(
-            io::ErrorKind::InvalidInput,
-            "paths may not contain interior null bytes",
-        ));
-    }
-
-    if bytes.len() >= addr.sun_path.len() {
-        return Err(io::Error::new(
-            io::ErrorKind::InvalidInput,
-            "path must be shorter than SUN_LEN",
-        ));
-    }
-    for (dst, src) in addr.sun_path.iter_mut().zip(bytes.iter()) {
-        *dst = *src as libc::c_char;
-    }
-    // null byte for pathname addresses is already there because we zeroed the
-    // struct
-
-    let mut len = sun_path_offset(&addr) + bytes.len();
-    match bytes.get(0) {
-        Some(&0) | None => {}
-        Some(_) => len += 1,
-    }
-    Ok((addr, len as libc::socklen_t))
-}
-
-enum AddressKind<'a> {
-    Unnamed,
-    Pathname(&'a Path),
-    Abstract(&'a [u8]),
-}
-
-/// An address associated with a Unix socket.
-///
-/// # Examples
-///
-/// ```
-/// use std::os::unix::net::UnixListener;
-///
-/// let socket = match UnixListener::bind("/tmp/sock") {
-///     Ok(sock) => sock,
-///     Err(e) => {
-///         println!("Couldn't bind: {:?}", e);
-///         return
-///     }
-/// };
-/// let addr = socket.local_addr().expect("Couldn't get local address");
-/// ```
-#[derive(Clone)]
-#[stable(feature = "unix_socket", since = "1.10.0")]
-pub struct SocketAddr {
-    addr: libc::sockaddr_un,
-    len: libc::socklen_t,
-}
-
-impl SocketAddr {
-    fn new<F>(f: F) -> io::Result<SocketAddr>
-    where
-        F: FnOnce(*mut libc::sockaddr, *mut libc::socklen_t) -> libc::c_int,
-    {
-        unsafe {
-            let mut addr: libc::sockaddr_un = mem::zeroed();
-            let mut len = mem::size_of::<libc::sockaddr_un>() as libc::socklen_t;
-            cvt(f(&mut addr as *mut _ as *mut _, &mut len))?;
-            SocketAddr::from_parts(addr, len)
-        }
-    }
-
-    fn from_parts(addr: libc::sockaddr_un, mut len: libc::socklen_t) -> io::Result<SocketAddr> {
-        if len == 0 {
-            // When there is a datagram from unnamed unix socket
-            // linux returns zero bytes of address
-            len = sun_path_offset(&addr) as libc::socklen_t; // i.e., zero-length address
-        } else if addr.sun_family != libc::AF_UNIX as libc::sa_family_t {
-            return Err(io::Error::new(
-                io::ErrorKind::InvalidInput,
-                "file descriptor did not correspond to a Unix socket",
-            ));
-        }
-
-        Ok(SocketAddr { addr, len })
-    }
-
-    /// Returns `true` if the address is unnamed.
-    ///
-    /// # Examples
-    ///
-    /// A named address:
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixListener;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixListener::bind("/tmp/sock")?;
-    ///     let addr = socket.local_addr().expect("Couldn't get local address");
-    ///     assert_eq!(addr.is_unnamed(), false);
-    ///     Ok(())
-    /// }
-    /// ```
-    ///
-    /// An unnamed address:
-    ///
-    /// ```
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixDatagram::unbound()?;
-    ///     let addr = socket.local_addr().expect("Couldn't get local address");
-    ///     assert_eq!(addr.is_unnamed(), true);
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn is_unnamed(&self) -> bool {
-        if let AddressKind::Unnamed = self.address() { true } else { false }
-    }
-
-    /// Returns the contents of this address if it is a `pathname` address.
-    ///
-    /// # Examples
-    ///
-    /// With a pathname:
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixListener;
-    /// use std::path::Path;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixListener::bind("/tmp/sock")?;
-    ///     let addr = socket.local_addr().expect("Couldn't get local address");
-    ///     assert_eq!(addr.as_pathname(), Some(Path::new("/tmp/sock")));
-    ///     Ok(())
-    /// }
-    /// ```
-    ///
-    /// Without a pathname:
-    ///
-    /// ```
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixDatagram::unbound()?;
-    ///     let addr = socket.local_addr().expect("Couldn't get local address");
-    ///     assert_eq!(addr.as_pathname(), None);
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn as_pathname(&self) -> Option<&Path> {
-        if let AddressKind::Pathname(path) = self.address() { Some(path) } else { None }
-    }
-
-    fn address(&self) -> AddressKind<'_> {
-        let len = self.len as usize - sun_path_offset(&self.addr);
-        let path = unsafe { mem::transmute::<&[libc::c_char], &[u8]>(&self.addr.sun_path) };
-
-        // macOS seems to return a len of 16 and a zeroed sun_path for unnamed addresses
-        if len == 0
-            || (cfg!(not(any(target_os = "linux", target_os = "android")))
-                && self.addr.sun_path[0] == 0)
-        {
-            AddressKind::Unnamed
-        } else if self.addr.sun_path[0] == 0 {
-            AddressKind::Abstract(&path[1..len])
-        } else {
-            AddressKind::Pathname(OsStr::from_bytes(&path[..len - 1]).as_ref())
-        }
-    }
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl fmt::Debug for SocketAddr {
-    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.address() {
-            AddressKind::Unnamed => write!(fmt, "(unnamed)"),
-            AddressKind::Abstract(name) => write!(fmt, "{} (abstract)", AsciiEscaped(name)),
-            AddressKind::Pathname(path) => write!(fmt, "{:?} (pathname)", path),
-        }
-    }
-}
-
-struct AsciiEscaped<'a>(&'a [u8]);
-
-impl<'a> fmt::Display for AsciiEscaped<'a> {
-    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(fmt, "\"")?;
-        for byte in self.0.iter().cloned().flat_map(ascii::escape_default) {
-            write!(fmt, "{}", byte as char)?;
-        }
-        write!(fmt, "\"")
-    }
-}
-
-/// A Unix stream socket.
-///
-/// # Examples
-///
-/// ```no_run
-/// use std::os::unix::net::UnixStream;
-/// use std::io::prelude::*;
-///
-/// fn main() -> std::io::Result<()> {
-///     let mut stream = UnixStream::connect("/path/to/my/socket")?;
-///     stream.write_all(b"hello world")?;
-///     let mut response = String::new();
-///     stream.read_to_string(&mut response)?;
-///     println!("{}", response);
-///     Ok(())
-/// }
-/// ```
-#[stable(feature = "unix_socket", since = "1.10.0")]
-pub struct UnixStream(Socket);
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl fmt::Debug for UnixStream {
-    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let mut builder = fmt.debug_struct("UnixStream");
-        builder.field("fd", self.0.as_inner());
-        if let Ok(addr) = self.local_addr() {
-            builder.field("local", &addr);
-        }
-        if let Ok(addr) = self.peer_addr() {
-            builder.field("peer", &addr);
-        }
-        builder.finish()
-    }
-}
-
-impl UnixStream {
-    /// Connects to the socket named by `path`.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixStream;
-    ///
-    /// let socket = match UnixStream::connect("/tmp/sock") {
-    ///     Ok(sock) => sock,
-    ///     Err(e) => {
-    ///         println!("Couldn't connect: {:?}", e);
-    ///         return
-    ///     }
-    /// };
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn connect<P: AsRef<Path>>(path: P) -> io::Result<UnixStream> {
-        fn inner(path: &Path) -> io::Result<UnixStream> {
-            unsafe {
-                let inner = Socket::new_raw(libc::AF_UNIX, libc::SOCK_STREAM)?;
-                let (addr, len) = sockaddr_un(path)?;
-
-                cvt(libc::connect(*inner.as_inner(), &addr as *const _ as *const _, len))?;
-                Ok(UnixStream(inner))
-            }
-        }
-        inner(path.as_ref())
-    }
-
-    /// Creates an unnamed pair of connected sockets.
-    ///
-    /// Returns two `UnixStream`s which are connected to each other.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixStream;
-    ///
-    /// let (sock1, sock2) = match UnixStream::pair() {
-    ///     Ok((sock1, sock2)) => (sock1, sock2),
-    ///     Err(e) => {
-    ///         println!("Couldn't create a pair of sockets: {:?}", e);
-    ///         return
-    ///     }
-    /// };
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn pair() -> io::Result<(UnixStream, UnixStream)> {
-        let (i1, i2) = Socket::new_pair(libc::AF_UNIX, libc::SOCK_STREAM)?;
-        Ok((UnixStream(i1), UnixStream(i2)))
-    }
-
-    /// Creates a new independently owned handle to the underlying socket.
-    ///
-    /// The returned `UnixStream` is a reference to the same stream that this
-    /// object references. Both handles will read and write the same stream of
-    /// data, and options set on one stream will be propagated to the other
-    /// stream.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixStream;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixStream::connect("/tmp/sock")?;
-    ///     let sock_copy = socket.try_clone().expect("Couldn't clone socket");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn try_clone(&self) -> io::Result<UnixStream> {
-        self.0.duplicate().map(UnixStream)
-    }
-
-    /// Returns the socket address of the local half of this connection.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixStream;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixStream::connect("/tmp/sock")?;
-    ///     let addr = socket.local_addr().expect("Couldn't get local address");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn local_addr(&self) -> io::Result<SocketAddr> {
-        SocketAddr::new(|addr, len| unsafe { libc::getsockname(*self.0.as_inner(), addr, len) })
-    }
-
-    /// Returns the socket address of the remote half of this connection.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixStream;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixStream::connect("/tmp/sock")?;
-    ///     let addr = socket.peer_addr().expect("Couldn't get peer address");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn peer_addr(&self) -> io::Result<SocketAddr> {
-        SocketAddr::new(|addr, len| unsafe { libc::getpeername(*self.0.as_inner(), addr, len) })
-    }
-
-    /// Gets the peer credentials for this Unix domain socket.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// #![feature(peer_credentials_unix_socket)]
-    /// use std::os::unix::net::UnixStream;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixStream::connect("/tmp/sock")?;
-    ///     let peer_cred = socket.peer_cred().expect("Couldn't get peer credentials");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[unstable(feature = "peer_credentials_unix_socket", issue = "42839", reason = "unstable")]
-    #[cfg(any(
-        target_os = "android",
-        target_os = "linux",
-        target_os = "dragonfly",
-        target_os = "freebsd",
-        target_os = "ios",
-        target_os = "macos",
-        target_os = "openbsd"
-    ))]
-    pub fn peer_cred(&self) -> io::Result<UCred> {
-        ucred::peer_cred(self)
-    }
-
-    /// Sets the read timeout for the socket.
-    ///
-    /// If the provided value is [`None`], then [`read`] calls will block
-    /// indefinitely. An [`Err`] is returned if the zero [`Duration`] is passed to this
-    /// method.
-    ///
-    /// [`read`]: io::Read::read
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixStream;
-    /// use std::time::Duration;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixStream::connect("/tmp/sock")?;
-    ///     socket.set_read_timeout(Some(Duration::new(1, 0))).expect("Couldn't set read timeout");
-    ///     Ok(())
-    /// }
-    /// ```
-    ///
-    /// An [`Err`] is returned if the zero [`Duration`] is passed to this
-    /// method:
-    ///
-    /// ```no_run
-    /// use std::io;
-    /// use std::os::unix::net::UnixStream;
-    /// use std::time::Duration;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixStream::connect("/tmp/sock")?;
-    ///     let result = socket.set_read_timeout(Some(Duration::new(0, 0)));
-    ///     let err = result.unwrap_err();
-    ///     assert_eq!(err.kind(), io::ErrorKind::InvalidInput);
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn set_read_timeout(&self, timeout: Option<Duration>) -> io::Result<()> {
-        self.0.set_timeout(timeout, libc::SO_RCVTIMEO)
-    }
-
-    /// Sets the write timeout for the socket.
-    ///
-    /// If the provided value is [`None`], then [`write`] calls will block
-    /// indefinitely. An [`Err`] is returned if the zero [`Duration`] is
-    /// passed to this method.
-    ///
-    /// [`read`]: io::Read::read
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixStream;
-    /// use std::time::Duration;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixStream::connect("/tmp/sock")?;
-    ///     socket.set_write_timeout(Some(Duration::new(1, 0)))
-    ///         .expect("Couldn't set write timeout");
-    ///     Ok(())
-    /// }
-    /// ```
-    ///
-    /// An [`Err`] is returned if the zero [`Duration`] is passed to this
-    /// method:
-    ///
-    /// ```no_run
-    /// use std::io;
-    /// use std::net::UdpSocket;
-    /// use std::time::Duration;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UdpSocket::bind("127.0.0.1:34254")?;
-    ///     let result = socket.set_write_timeout(Some(Duration::new(0, 0)));
-    ///     let err = result.unwrap_err();
-    ///     assert_eq!(err.kind(), io::ErrorKind::InvalidInput);
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn set_write_timeout(&self, timeout: Option<Duration>) -> io::Result<()> {
-        self.0.set_timeout(timeout, libc::SO_SNDTIMEO)
-    }
-
-    /// Returns the read timeout of this socket.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixStream;
-    /// use std::time::Duration;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixStream::connect("/tmp/sock")?;
-    ///     socket.set_read_timeout(Some(Duration::new(1, 0))).expect("Couldn't set read timeout");
-    ///     assert_eq!(socket.read_timeout()?, Some(Duration::new(1, 0)));
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn read_timeout(&self) -> io::Result<Option<Duration>> {
-        self.0.timeout(libc::SO_RCVTIMEO)
-    }
-
-    /// Returns the write timeout of this socket.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixStream;
-    /// use std::time::Duration;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixStream::connect("/tmp/sock")?;
-    ///     socket.set_write_timeout(Some(Duration::new(1, 0)))
-    ///         .expect("Couldn't set write timeout");
-    ///     assert_eq!(socket.write_timeout()?, Some(Duration::new(1, 0)));
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn write_timeout(&self) -> io::Result<Option<Duration>> {
-        self.0.timeout(libc::SO_SNDTIMEO)
-    }
-
-    /// Moves the socket into or out of nonblocking mode.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixStream;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixStream::connect("/tmp/sock")?;
-    ///     socket.set_nonblocking(true).expect("Couldn't set nonblocking");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
-        self.0.set_nonblocking(nonblocking)
-    }
-
-    /// Returns the value of the `SO_ERROR` option.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixStream;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixStream::connect("/tmp/sock")?;
-    ///     if let Ok(Some(err)) = socket.take_error() {
-    ///         println!("Got error: {:?}", err);
-    ///     }
-    ///     Ok(())
-    /// }
-    /// ```
-    ///
-    /// # Platform specific
-    /// On Redox this always returns `None`.
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
-        self.0.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`]).
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixStream;
-    /// use std::net::Shutdown;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixStream::connect("/tmp/sock")?;
-    ///     socket.shutdown(Shutdown::Both).expect("shutdown function failed");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
-        self.0.shutdown(how)
-    }
-
-    /// 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.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// #![feature(unix_socket_peek)]
-    ///
-    /// use std::os::unix::net::UnixStream;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixStream::connect("/tmp/sock")?;
-    ///     let mut buf = [0; 10];
-    ///     let len = socket.peek(&mut buf).expect("peek failed");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[unstable(feature = "unix_socket_peek", issue = "76923")]
-    pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
-        self.0.peek(buf)
-    }
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl io::Read for UnixStream {
-    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
-        io::Read::read(&mut &*self, buf)
-    }
-
-    fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
-        io::Read::read_vectored(&mut &*self, bufs)
-    }
-
-    #[inline]
-    fn is_read_vectored(&self) -> bool {
-        io::Read::is_read_vectored(&&*self)
-    }
-
-    #[inline]
-    unsafe fn initializer(&self) -> Initializer {
-        Initializer::nop()
-    }
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl<'a> io::Read for &'a UnixStream {
-    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
-        self.0.read(buf)
-    }
-
-    fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
-        self.0.read_vectored(bufs)
-    }
-
-    #[inline]
-    fn is_read_vectored(&self) -> bool {
-        self.0.is_read_vectored()
-    }
-
-    #[inline]
-    unsafe fn initializer(&self) -> Initializer {
-        Initializer::nop()
-    }
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl io::Write for UnixStream {
-    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        io::Write::write(&mut &*self, buf)
-    }
-
-    fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
-        io::Write::write_vectored(&mut &*self, bufs)
-    }
-
-    #[inline]
-    fn is_write_vectored(&self) -> bool {
-        io::Write::is_write_vectored(&&*self)
-    }
-
-    fn flush(&mut self) -> io::Result<()> {
-        io::Write::flush(&mut &*self)
-    }
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl<'a> io::Write for &'a UnixStream {
-    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        self.0.write(buf)
-    }
-
-    fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
-        self.0.write_vectored(bufs)
-    }
-
-    #[inline]
-    fn is_write_vectored(&self) -> bool {
-        self.0.is_write_vectored()
-    }
-
-    fn flush(&mut self) -> io::Result<()> {
-        Ok(())
-    }
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl AsRawFd for UnixStream {
-    fn as_raw_fd(&self) -> RawFd {
-        *self.0.as_inner()
-    }
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl FromRawFd for UnixStream {
-    unsafe fn from_raw_fd(fd: RawFd) -> UnixStream {
-        UnixStream(Socket::from_inner(fd))
-    }
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl IntoRawFd for UnixStream {
-    fn into_raw_fd(self) -> RawFd {
-        self.0.into_inner()
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl AsRawFd for net::TcpStream {
-    fn as_raw_fd(&self) -> RawFd {
-        *self.as_inner().socket().as_inner()
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl AsRawFd for net::TcpListener {
-    fn as_raw_fd(&self) -> RawFd {
-        *self.as_inner().socket().as_inner()
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl AsRawFd for net::UdpSocket {
-    fn as_raw_fd(&self) -> RawFd {
-        *self.as_inner().socket().as_inner()
-    }
-}
-
-#[stable(feature = "from_raw_os", since = "1.1.0")]
-impl FromRawFd for net::TcpStream {
-    unsafe fn from_raw_fd(fd: RawFd) -> net::TcpStream {
-        let socket = sys::net::Socket::from_inner(fd);
-        net::TcpStream::from_inner(sys_common::net::TcpStream::from_inner(socket))
-    }
-}
-
-#[stable(feature = "from_raw_os", since = "1.1.0")]
-impl FromRawFd for net::TcpListener {
-    unsafe fn from_raw_fd(fd: RawFd) -> net::TcpListener {
-        let socket = sys::net::Socket::from_inner(fd);
-        net::TcpListener::from_inner(sys_common::net::TcpListener::from_inner(socket))
-    }
-}
-
-#[stable(feature = "from_raw_os", since = "1.1.0")]
-impl FromRawFd for net::UdpSocket {
-    unsafe fn from_raw_fd(fd: RawFd) -> net::UdpSocket {
-        let socket = sys::net::Socket::from_inner(fd);
-        net::UdpSocket::from_inner(sys_common::net::UdpSocket::from_inner(socket))
-    }
-}
-
-#[stable(feature = "into_raw_os", since = "1.4.0")]
-impl IntoRawFd for net::TcpStream {
-    fn into_raw_fd(self) -> RawFd {
-        self.into_inner().into_socket().into_inner()
-    }
-}
-#[stable(feature = "into_raw_os", since = "1.4.0")]
-impl IntoRawFd for net::TcpListener {
-    fn into_raw_fd(self) -> RawFd {
-        self.into_inner().into_socket().into_inner()
-    }
-}
-#[stable(feature = "into_raw_os", since = "1.4.0")]
-impl IntoRawFd for net::UdpSocket {
-    fn into_raw_fd(self) -> RawFd {
-        self.into_inner().into_socket().into_inner()
-    }
-}
-
-/// A structure representing a Unix domain socket server.
-///
-/// # Examples
-///
-/// ```no_run
-/// use std::thread;
-/// use std::os::unix::net::{UnixStream, UnixListener};
-///
-/// fn handle_client(stream: UnixStream) {
-///     // ...
-/// }
-///
-/// fn main() -> std::io::Result<()> {
-///     let listener = UnixListener::bind("/path/to/the/socket")?;
-///
-///     // accept connections and process them, spawning a new thread for each one
-///     for stream in listener.incoming() {
-///         match stream {
-///             Ok(stream) => {
-///                 /* connection succeeded */
-///                 thread::spawn(|| handle_client(stream));
-///             }
-///             Err(err) => {
-///                 /* connection failed */
-///                 break;
-///             }
-///         }
-///     }
-///     Ok(())
-/// }
-/// ```
-#[stable(feature = "unix_socket", since = "1.10.0")]
-pub struct UnixListener(Socket);
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl fmt::Debug for UnixListener {
-    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let mut builder = fmt.debug_struct("UnixListener");
-        builder.field("fd", self.0.as_inner());
-        if let Ok(addr) = self.local_addr() {
-            builder.field("local", &addr);
-        }
-        builder.finish()
-    }
-}
-
-impl UnixListener {
-    /// Creates a new `UnixListener` bound to the specified socket.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixListener;
-    ///
-    /// let listener = match UnixListener::bind("/path/to/the/socket") {
-    ///     Ok(sock) => sock,
-    ///     Err(e) => {
-    ///         println!("Couldn't connect: {:?}", e);
-    ///         return
-    ///     }
-    /// };
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn bind<P: AsRef<Path>>(path: P) -> io::Result<UnixListener> {
-        fn inner(path: &Path) -> io::Result<UnixListener> {
-            unsafe {
-                let inner = Socket::new_raw(libc::AF_UNIX, libc::SOCK_STREAM)?;
-                let (addr, len) = sockaddr_un(path)?;
-
-                cvt(libc::bind(*inner.as_inner(), &addr as *const _ as *const _, len as _))?;
-                cvt(libc::listen(*inner.as_inner(), 128))?;
-
-                Ok(UnixListener(inner))
-            }
-        }
-        inner(path.as_ref())
-    }
-
-    /// Accepts a new incoming connection to this listener.
-    ///
-    /// This function will block the calling thread until a new Unix connection
-    /// is established. When established, the corresponding [`UnixStream`] and
-    /// the remote peer's address will be returned.
-    ///
-    /// [`UnixStream`]: crate::os::unix::net::UnixStream
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixListener;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let listener = UnixListener::bind("/path/to/the/socket")?;
-    ///
-    ///     match listener.accept() {
-    ///         Ok((socket, addr)) => println!("Got a client: {:?}", addr),
-    ///         Err(e) => println!("accept function failed: {:?}", e),
-    ///     }
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn accept(&self) -> io::Result<(UnixStream, SocketAddr)> {
-        let mut storage: libc::sockaddr_un = unsafe { mem::zeroed() };
-        let mut len = mem::size_of_val(&storage) as libc::socklen_t;
-        let sock = self.0.accept(&mut storage as *mut _ as *mut _, &mut len)?;
-        let addr = SocketAddr::from_parts(storage, len)?;
-        Ok((UnixStream(sock), addr))
-    }
-
-    /// Creates a new independently owned handle to the underlying socket.
-    ///
-    /// The returned `UnixListener` is a reference to the same socket that this
-    /// object references. Both handles can be used to accept incoming
-    /// connections and options set on one listener will affect the other.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixListener;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let listener = UnixListener::bind("/path/to/the/socket")?;
-    ///     let listener_copy = listener.try_clone().expect("try_clone failed");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn try_clone(&self) -> io::Result<UnixListener> {
-        self.0.duplicate().map(UnixListener)
-    }
-
-    /// Returns the local socket address of this listener.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixListener;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let listener = UnixListener::bind("/path/to/the/socket")?;
-    ///     let addr = listener.local_addr().expect("Couldn't get local address");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn local_addr(&self) -> io::Result<SocketAddr> {
-        SocketAddr::new(|addr, len| unsafe { libc::getsockname(*self.0.as_inner(), addr, len) })
-    }
-
-    /// Moves the socket into or out of nonblocking mode.
-    ///
-    /// This will result in the `accept` operation becoming nonblocking,
-    /// i.e., immediately returning from their calls. If the IO operation is
-    /// successful, `Ok` is returned and no further action is required. If the
-    /// IO operation could not be completed and needs to be retried, an error
-    /// with kind [`io::ErrorKind::WouldBlock`] is returned.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixListener;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let listener = UnixListener::bind("/path/to/the/socket")?;
-    ///     listener.set_nonblocking(true).expect("Couldn't set non blocking");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
-        self.0.set_nonblocking(nonblocking)
-    }
-
-    /// Returns the value of the `SO_ERROR` option.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixListener;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let listener = UnixListener::bind("/tmp/sock")?;
-    ///
-    ///     if let Ok(Some(err)) = listener.take_error() {
-    ///         println!("Got error: {:?}", err);
-    ///     }
-    ///     Ok(())
-    /// }
-    /// ```
-    ///
-    /// # Platform specific
-    /// On Redox this always returns `None`.
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
-        self.0.take_error()
-    }
-
-    /// Returns an iterator over incoming connections.
-    ///
-    /// The iterator will never return [`None`] and will also not yield the
-    /// peer's [`SocketAddr`] structure.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::thread;
-    /// use std::os::unix::net::{UnixStream, UnixListener};
-    ///
-    /// fn handle_client(stream: UnixStream) {
-    ///     // ...
-    /// }
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let listener = UnixListener::bind("/path/to/the/socket")?;
-    ///
-    ///     for stream in listener.incoming() {
-    ///         match stream {
-    ///             Ok(stream) => {
-    ///                 thread::spawn(|| handle_client(stream));
-    ///             }
-    ///             Err(err) => {
-    ///                 break;
-    ///             }
-    ///         }
-    ///     }
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn incoming(&self) -> Incoming<'_> {
-        Incoming { listener: self }
-    }
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl AsRawFd for UnixListener {
-    fn as_raw_fd(&self) -> RawFd {
-        *self.0.as_inner()
-    }
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl FromRawFd for UnixListener {
-    unsafe fn from_raw_fd(fd: RawFd) -> UnixListener {
-        UnixListener(Socket::from_inner(fd))
-    }
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl IntoRawFd for UnixListener {
-    fn into_raw_fd(self) -> RawFd {
-        self.0.into_inner()
-    }
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl<'a> IntoIterator for &'a UnixListener {
-    type Item = io::Result<UnixStream>;
-    type IntoIter = Incoming<'a>;
-
-    fn into_iter(self) -> Incoming<'a> {
-        self.incoming()
-    }
-}
-
-/// An iterator over incoming connections to a [`UnixListener`].
-///
-/// It will never return [`None`].
-///
-/// # Examples
-///
-/// ```no_run
-/// use std::thread;
-/// use std::os::unix::net::{UnixStream, UnixListener};
-///
-/// fn handle_client(stream: UnixStream) {
-///     // ...
-/// }
-///
-/// fn main() -> std::io::Result<()> {
-///     let listener = UnixListener::bind("/path/to/the/socket")?;
-///
-///     for stream in listener.incoming() {
-///         match stream {
-///             Ok(stream) => {
-///                 thread::spawn(|| handle_client(stream));
-///             }
-///             Err(err) => {
-///                 break;
-///             }
-///         }
-///     }
-///     Ok(())
-/// }
-/// ```
-#[derive(Debug)]
-#[stable(feature = "unix_socket", since = "1.10.0")]
-pub struct Incoming<'a> {
-    listener: &'a UnixListener,
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl<'a> Iterator for Incoming<'a> {
-    type Item = io::Result<UnixStream>;
-
-    fn next(&mut self) -> Option<io::Result<UnixStream>> {
-        Some(self.listener.accept().map(|s| s.0))
-    }
-
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        (usize::MAX, None)
-    }
-}
-
-/// A Unix datagram socket.
-///
-/// # Examples
-///
-/// ```no_run
-/// use std::os::unix::net::UnixDatagram;
-///
-/// fn main() -> std::io::Result<()> {
-///     let socket = UnixDatagram::bind("/path/to/my/socket")?;
-///     socket.send_to(b"hello world", "/path/to/other/socket")?;
-///     let mut buf = [0; 100];
-///     let (count, address) = socket.recv_from(&mut buf)?;
-///     println!("socket {:?} sent {:?}", address, &buf[..count]);
-///     Ok(())
-/// }
-/// ```
-#[stable(feature = "unix_socket", since = "1.10.0")]
-pub struct UnixDatagram(Socket);
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl fmt::Debug for UnixDatagram {
-    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let mut builder = fmt.debug_struct("UnixDatagram");
-        builder.field("fd", self.0.as_inner());
-        if let Ok(addr) = self.local_addr() {
-            builder.field("local", &addr);
-        }
-        if let Ok(addr) = self.peer_addr() {
-            builder.field("peer", &addr);
-        }
-        builder.finish()
-    }
-}
-
-impl UnixDatagram {
-    /// Creates a Unix datagram socket bound to the given path.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// let sock = match UnixDatagram::bind("/path/to/the/socket") {
-    ///     Ok(sock) => sock,
-    ///     Err(e) => {
-    ///         println!("Couldn't bind: {:?}", e);
-    ///         return
-    ///     }
-    /// };
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn bind<P: AsRef<Path>>(path: P) -> io::Result<UnixDatagram> {
-        fn inner(path: &Path) -> io::Result<UnixDatagram> {
-            unsafe {
-                let socket = UnixDatagram::unbound()?;
-                let (addr, len) = sockaddr_un(path)?;
-
-                cvt(libc::bind(*socket.0.as_inner(), &addr as *const _ as *const _, len as _))?;
-
-                Ok(socket)
-            }
-        }
-        inner(path.as_ref())
-    }
-
-    /// Creates a Unix Datagram socket which is not bound to any address.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// let sock = match UnixDatagram::unbound() {
-    ///     Ok(sock) => sock,
-    ///     Err(e) => {
-    ///         println!("Couldn't unbound: {:?}", e);
-    ///         return
-    ///     }
-    /// };
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn unbound() -> io::Result<UnixDatagram> {
-        let inner = Socket::new_raw(libc::AF_UNIX, libc::SOCK_DGRAM)?;
-        Ok(UnixDatagram(inner))
-    }
-
-    /// Creates an unnamed pair of connected sockets.
-    ///
-    /// Returns two `UnixDatagrams`s which are connected to each other.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// let (sock1, sock2) = match UnixDatagram::pair() {
-    ///     Ok((sock1, sock2)) => (sock1, sock2),
-    ///     Err(e) => {
-    ///         println!("Couldn't unbound: {:?}", e);
-    ///         return
-    ///     }
-    /// };
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn pair() -> io::Result<(UnixDatagram, UnixDatagram)> {
-        let (i1, i2) = Socket::new_pair(libc::AF_UNIX, libc::SOCK_DGRAM)?;
-        Ok((UnixDatagram(i1), UnixDatagram(i2)))
-    }
-
-    /// Connects the socket to the specified address.
-    ///
-    /// The [`send`] method may be used to send data to the specified address.
-    /// [`recv`] and [`recv_from`] will only receive data from that address.
-    ///
-    /// [`send`]: UnixDatagram::send
-    /// [`recv`]: UnixDatagram::recv
-    /// [`recv_from`]: UnixDatagram::recv_from
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let sock = UnixDatagram::unbound()?;
-    ///     match sock.connect("/path/to/the/socket") {
-    ///         Ok(sock) => sock,
-    ///         Err(e) => {
-    ///             println!("Couldn't connect: {:?}", e);
-    ///             return Err(e)
-    ///         }
-    ///     };
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn connect<P: AsRef<Path>>(&self, path: P) -> io::Result<()> {
-        fn inner(d: &UnixDatagram, path: &Path) -> io::Result<()> {
-            unsafe {
-                let (addr, len) = sockaddr_un(path)?;
-
-                cvt(libc::connect(*d.0.as_inner(), &addr as *const _ as *const _, len))?;
-
-                Ok(())
-            }
-        }
-        inner(self, path.as_ref())
-    }
-
-    /// Creates a new independently owned handle to the underlying socket.
-    ///
-    /// The returned `UnixDatagram` is a reference to the same socket that this
-    /// object references. Both handles can be used to accept incoming
-    /// connections and options set on one side will affect the other.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let sock = UnixDatagram::bind("/path/to/the/socket")?;
-    ///     let sock_copy = sock.try_clone().expect("try_clone failed");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn try_clone(&self) -> io::Result<UnixDatagram> {
-        self.0.duplicate().map(UnixDatagram)
-    }
-
-    /// Returns the address of this socket.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let sock = UnixDatagram::bind("/path/to/the/socket")?;
-    ///     let addr = sock.local_addr().expect("Couldn't get local address");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn local_addr(&self) -> io::Result<SocketAddr> {
-        SocketAddr::new(|addr, len| unsafe { libc::getsockname(*self.0.as_inner(), addr, len) })
-    }
-
-    /// Returns the address of this socket's peer.
-    ///
-    /// The [`connect`] method will connect the socket to a peer.
-    ///
-    /// [`connect`]: UnixDatagram::connect
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let sock = UnixDatagram::unbound()?;
-    ///     sock.connect("/path/to/the/socket")?;
-    ///
-    ///     let addr = sock.peer_addr().expect("Couldn't get peer address");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn peer_addr(&self) -> io::Result<SocketAddr> {
-        SocketAddr::new(|addr, len| unsafe { libc::getpeername(*self.0.as_inner(), addr, len) })
-    }
-
-    fn recv_from_flags(
-        &self,
-        buf: &mut [u8],
-        flags: libc::c_int,
-    ) -> io::Result<(usize, SocketAddr)> {
-        let mut count = 0;
-        let addr = SocketAddr::new(|addr, len| unsafe {
-            count = libc::recvfrom(
-                *self.0.as_inner(),
-                buf.as_mut_ptr() as *mut _,
-                buf.len(),
-                flags,
-                addr,
-                len,
-            );
-            if count > 0 {
-                1
-            } else if count == 0 {
-                0
-            } else {
-                -1
-            }
-        })?;
-
-        Ok((count as usize, addr))
-    }
-
-    /// Receives data from the socket.
-    ///
-    /// On success, returns the number of bytes read and the address from
-    /// whence the data came.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let sock = UnixDatagram::unbound()?;
-    ///     let mut buf = vec![0; 10];
-    ///     let (size, sender) = sock.recv_from(buf.as_mut_slice())?;
-    ///     println!("received {} bytes from {:?}", size, sender);
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
-        self.recv_from_flags(buf, 0)
-    }
-
-    /// Receives data from the socket.
-    ///
-    /// On success, returns the number of bytes read.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let sock = UnixDatagram::bind("/path/to/the/socket")?;
-    ///     let mut buf = vec![0; 10];
-    ///     sock.recv(buf.as_mut_slice()).expect("recv function failed");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn recv(&self, buf: &mut [u8]) -> io::Result<usize> {
-        self.0.read(buf)
-    }
-
-    /// Sends data on the socket to the specified address.
-    ///
-    /// On success, returns the number of bytes written.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let sock = UnixDatagram::unbound()?;
-    ///     sock.send_to(b"omelette au fromage", "/some/sock").expect("send_to function failed");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn send_to<P: AsRef<Path>>(&self, buf: &[u8], path: P) -> io::Result<usize> {
-        fn inner(d: &UnixDatagram, buf: &[u8], path: &Path) -> io::Result<usize> {
-            unsafe {
-                let (addr, len) = sockaddr_un(path)?;
-
-                let count = cvt(libc::sendto(
-                    *d.0.as_inner(),
-                    buf.as_ptr() as *const _,
-                    buf.len(),
-                    MSG_NOSIGNAL,
-                    &addr as *const _ as *const _,
-                    len,
-                ))?;
-                Ok(count as usize)
-            }
-        }
-        inner(self, buf, path.as_ref())
-    }
-
-    /// 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.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let sock = UnixDatagram::unbound()?;
-    ///     sock.connect("/some/sock").expect("Couldn't connect");
-    ///     sock.send(b"omelette au fromage").expect("send_to function failed");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn send(&self, buf: &[u8]) -> io::Result<usize> {
-        self.0.write(buf)
-    }
-
-    /// Sets the read timeout for the socket.
-    ///
-    /// If the provided value is [`None`], then [`recv`] and [`recv_from`] calls will
-    /// block indefinitely. An [`Err`] is returned if the zero [`Duration`]
-    /// is passed to this method.
-    ///
-    /// [`recv`]: UnixDatagram::recv
-    /// [`recv_from`]: UnixDatagram::recv_from
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use std::os::unix::net::UnixDatagram;
-    /// use std::time::Duration;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let sock = UnixDatagram::unbound()?;
-    ///     sock.set_read_timeout(Some(Duration::new(1, 0)))
-    ///         .expect("set_read_timeout function failed");
-    ///     Ok(())
-    /// }
-    /// ```
-    ///
-    /// An [`Err`] is returned if the zero [`Duration`] is passed to this
-    /// method:
-    ///
-    /// ```no_run
-    /// use std::io;
-    /// use std::os::unix::net::UnixDatagram;
-    /// use std::time::Duration;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixDatagram::unbound()?;
-    ///     let result = socket.set_read_timeout(Some(Duration::new(0, 0)));
-    ///     let err = result.unwrap_err();
-    ///     assert_eq!(err.kind(), io::ErrorKind::InvalidInput);
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn set_read_timeout(&self, timeout: Option<Duration>) -> io::Result<()> {
-        self.0.set_timeout(timeout, libc::SO_RCVTIMEO)
-    }
-
-    /// Sets the write timeout for the socket.
-    ///
-    /// If the provided value is [`None`], then [`send`] and [`send_to`] calls will
-    /// block indefinitely. An [`Err`] is returned if the zero [`Duration`] is passed to this
-    /// method.
-    ///
-    /// [`send`]: UnixDatagram::send
-    /// [`send_to`]: UnixDatagram::send_to
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use std::os::unix::net::UnixDatagram;
-    /// use std::time::Duration;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let sock = UnixDatagram::unbound()?;
-    ///     sock.set_write_timeout(Some(Duration::new(1, 0)))
-    ///         .expect("set_write_timeout function failed");
-    ///     Ok(())
-    /// }
-    /// ```
-    ///
-    /// An [`Err`] is returned if the zero [`Duration`] is passed to this
-    /// method:
-    ///
-    /// ```no_run
-    /// use std::io;
-    /// use std::os::unix::net::UnixDatagram;
-    /// use std::time::Duration;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixDatagram::unbound()?;
-    ///     let result = socket.set_write_timeout(Some(Duration::new(0, 0)));
-    ///     let err = result.unwrap_err();
-    ///     assert_eq!(err.kind(), io::ErrorKind::InvalidInput);
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn set_write_timeout(&self, timeout: Option<Duration>) -> io::Result<()> {
-        self.0.set_timeout(timeout, libc::SO_SNDTIMEO)
-    }
-
-    /// Returns the read timeout of this socket.
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use std::os::unix::net::UnixDatagram;
-    /// use std::time::Duration;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let sock = UnixDatagram::unbound()?;
-    ///     sock.set_read_timeout(Some(Duration::new(1, 0)))
-    ///         .expect("set_read_timeout function failed");
-    ///     assert_eq!(sock.read_timeout()?, Some(Duration::new(1, 0)));
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn read_timeout(&self) -> io::Result<Option<Duration>> {
-        self.0.timeout(libc::SO_RCVTIMEO)
-    }
-
-    /// Returns the write timeout of this socket.
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use std::os::unix::net::UnixDatagram;
-    /// use std::time::Duration;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let sock = UnixDatagram::unbound()?;
-    ///     sock.set_write_timeout(Some(Duration::new(1, 0)))
-    ///         .expect("set_write_timeout function failed");
-    ///     assert_eq!(sock.write_timeout()?, Some(Duration::new(1, 0)));
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn write_timeout(&self) -> io::Result<Option<Duration>> {
-        self.0.timeout(libc::SO_SNDTIMEO)
-    }
-
-    /// Moves the socket into or out of nonblocking mode.
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let sock = UnixDatagram::unbound()?;
-    ///     sock.set_nonblocking(true).expect("set_nonblocking function failed");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
-        self.0.set_nonblocking(nonblocking)
-    }
-
-    /// Returns the value of the `SO_ERROR` option.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let sock = UnixDatagram::unbound()?;
-    ///     if let Ok(Some(err)) = sock.take_error() {
-    ///         println!("Got error: {:?}", err);
-    ///     }
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
-        self.0.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`]).
-    ///
-    /// ```no_run
-    /// use std::os::unix::net::UnixDatagram;
-    /// use std::net::Shutdown;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let sock = UnixDatagram::unbound()?;
-    ///     sock.shutdown(Shutdown::Both).expect("shutdown function failed");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
-        self.0.shutdown(how)
-    }
-
-    /// 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.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// #![feature(unix_socket_peek)]
-    ///
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixDatagram::bind("/tmp/sock")?;
-    ///     let mut buf = [0; 10];
-    ///     let len = socket.peek(&mut buf).expect("peek failed");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[unstable(feature = "unix_socket_peek", issue = "76923")]
-    pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
-        self.0.peek(buf)
-    }
-
-    /// Receives a single datagram message on the socket, without removing it from the
-    /// queue. On success, returns the number of bytes read and the origin.
-    ///
-    /// The function must be called with valid byte array `buf` of sufficient size to
-    /// hold the message bytes. If a message is too long to fit in the supplied buffer,
-    /// excess bytes may be discarded.
-    ///
-    /// Successive calls return the same data. This is accomplished by passing
-    /// `MSG_PEEK` as a flag to the underlying `recvfrom` system call.
-    ///
-    /// Do not use this function to implement busy waiting, instead use `libc::poll` to
-    /// synchronize IO events on one or more sockets.
-    ///
-    /// # Examples
-    ///
-    /// ```no_run
-    /// #![feature(unix_socket_peek)]
-    ///
-    /// use std::os::unix::net::UnixDatagram;
-    ///
-    /// fn main() -> std::io::Result<()> {
-    ///     let socket = UnixDatagram::bind("/tmp/sock")?;
-    ///     let mut buf = [0; 10];
-    ///     let (len, addr) = socket.peek_from(&mut buf).expect("peek failed");
-    ///     Ok(())
-    /// }
-    /// ```
-    #[unstable(feature = "unix_socket_peek", issue = "76923")]
-    pub fn peek_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
-        self.recv_from_flags(buf, libc::MSG_PEEK)
-    }
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl AsRawFd for UnixDatagram {
-    fn as_raw_fd(&self) -> RawFd {
-        *self.0.as_inner()
-    }
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl FromRawFd for UnixDatagram {
-    unsafe fn from_raw_fd(fd: RawFd) -> UnixDatagram {
-        UnixDatagram(Socket::from_inner(fd))
-    }
-}
-
-#[stable(feature = "unix_socket", since = "1.10.0")]
-impl IntoRawFd for UnixDatagram {
-    fn into_raw_fd(self) -> RawFd {
-        self.0.into_inner()
-    }
-}
diff --git a/library/std/src/sys/unix/ext/net/addr.rs b/library/std/src/sys/unix/ext/net/addr.rs
new file mode 100644
index 00000000000..1f9036242eb
--- /dev/null
+++ b/library/std/src/sys/unix/ext/net/addr.rs
@@ -0,0 +1,226 @@
+use crate::ffi::OsStr;
+use crate::os::unix::ffi::OsStrExt;
+use crate::path::Path;
+use crate::sys::cvt;
+use crate::{ascii, fmt, io, mem};
+
+// FIXME(#43348): Make libc adapt #[doc(cfg(...))] so we don't need these fake definitions here?
+#[cfg(not(unix))]
+#[allow(non_camel_case_types)]
+mod libc {
+    pub use libc::c_int;
+    pub type socklen_t = u32;
+    pub struct sockaddr;
+    #[derive(Clone)]
+    pub struct sockaddr_un;
+}
+
+fn sun_path_offset(addr: &libc::sockaddr_un) -> usize {
+    // Work with an actual instance of the type since using a null pointer is UB
+    let base = addr as *const _ as usize;
+    let path = &addr.sun_path as *const _ as usize;
+    path - base
+}
+
+pub(super) unsafe fn sockaddr_un(path: &Path) -> io::Result<(libc::sockaddr_un, libc::socklen_t)> {
+    let mut addr: libc::sockaddr_un = mem::zeroed();
+    addr.sun_family = libc::AF_UNIX as libc::sa_family_t;
+
+    let bytes = path.as_os_str().as_bytes();
+
+    if bytes.contains(&0) {
+        return Err(io::Error::new(
+            io::ErrorKind::InvalidInput,
+            "paths may not contain interior null bytes",
+        ));
+    }
+
+    if bytes.len() >= addr.sun_path.len() {
+        return Err(io::Error::new(
+            io::ErrorKind::InvalidInput,
+            "path must be shorter than SUN_LEN",
+        ));
+    }
+    for (dst, src) in addr.sun_path.iter_mut().zip(bytes.iter()) {
+        *dst = *src as libc::c_char;
+    }
+    // null byte for pathname addresses is already there because we zeroed the
+    // struct
+
+    let mut len = sun_path_offset(&addr) + bytes.len();
+    match bytes.get(0) {
+        Some(&0) | None => {}
+        Some(_) => len += 1,
+    }
+    Ok((addr, len as libc::socklen_t))
+}
+
+enum AddressKind<'a> {
+    Unnamed,
+    Pathname(&'a Path),
+    Abstract(&'a [u8]),
+}
+
+struct AsciiEscaped<'a>(&'a [u8]);
+
+impl<'a> fmt::Display for AsciiEscaped<'a> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(fmt, "\"")?;
+        for byte in self.0.iter().cloned().flat_map(ascii::escape_default) {
+            write!(fmt, "{}", byte as char)?;
+        }
+        write!(fmt, "\"")
+    }
+}
+
+/// An address associated with a Unix socket.
+///
+/// # Examples
+///
+/// ```
+/// use std::os::unix::net::UnixListener;
+///
+/// let socket = match UnixListener::bind("/tmp/sock") {
+///     Ok(sock) => sock,
+///     Err(e) => {
+///         println!("Couldn't bind: {:?}", e);
+///         return
+///     }
+/// };
+/// let addr = socket.local_addr().expect("Couldn't get local address");
+/// ```
+#[derive(Clone)]
+#[stable(feature = "unix_socket", since = "1.10.0")]
+pub struct SocketAddr {
+    addr: libc::sockaddr_un,
+    len: libc::socklen_t,
+}
+
+impl SocketAddr {
+    pub(super) fn new<F>(f: F) -> io::Result<SocketAddr>
+    where
+        F: FnOnce(*mut libc::sockaddr, *mut libc::socklen_t) -> libc::c_int,
+    {
+        unsafe {
+            let mut addr: libc::sockaddr_un = mem::zeroed();
+            let mut len = mem::size_of::<libc::sockaddr_un>() as libc::socklen_t;
+            cvt(f(&mut addr as *mut _ as *mut _, &mut len))?;
+            SocketAddr::from_parts(addr, len)
+        }
+    }
+
+    pub(super) fn from_parts(
+        addr: libc::sockaddr_un,
+        mut len: libc::socklen_t,
+    ) -> io::Result<SocketAddr> {
+        if len == 0 {
+            // When there is a datagram from unnamed unix socket
+            // linux returns zero bytes of address
+            len = sun_path_offset(&addr) as libc::socklen_t; // i.e., zero-length address
+        } else if addr.sun_family != libc::AF_UNIX as libc::sa_family_t {
+            return Err(io::Error::new(
+                io::ErrorKind::InvalidInput,
+                "file descriptor did not correspond to a Unix socket",
+            ));
+        }
+
+        Ok(SocketAddr { addr, len })
+    }
+
+    /// Returns `true` if the address is unnamed.
+    ///
+    /// # Examples
+    ///
+    /// A named address:
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixListener;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixListener::bind("/tmp/sock")?;
+    ///     let addr = socket.local_addr().expect("Couldn't get local address");
+    ///     assert_eq!(addr.is_unnamed(), false);
+    ///     Ok(())
+    /// }
+    /// ```
+    ///
+    /// An unnamed address:
+    ///
+    /// ```
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixDatagram::unbound()?;
+    ///     let addr = socket.local_addr().expect("Couldn't get local address");
+    ///     assert_eq!(addr.is_unnamed(), true);
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn is_unnamed(&self) -> bool {
+        if let AddressKind::Unnamed = self.address() { true } else { false }
+    }
+
+    /// Returns the contents of this address if it is a `pathname` address.
+    ///
+    /// # Examples
+    ///
+    /// With a pathname:
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixListener;
+    /// use std::path::Path;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixListener::bind("/tmp/sock")?;
+    ///     let addr = socket.local_addr().expect("Couldn't get local address");
+    ///     assert_eq!(addr.as_pathname(), Some(Path::new("/tmp/sock")));
+    ///     Ok(())
+    /// }
+    /// ```
+    ///
+    /// Without a pathname:
+    ///
+    /// ```
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixDatagram::unbound()?;
+    ///     let addr = socket.local_addr().expect("Couldn't get local address");
+    ///     assert_eq!(addr.as_pathname(), None);
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn as_pathname(&self) -> Option<&Path> {
+        if let AddressKind::Pathname(path) = self.address() { Some(path) } else { None }
+    }
+
+    fn address(&self) -> AddressKind<'_> {
+        let len = self.len as usize - sun_path_offset(&self.addr);
+        let path = unsafe { mem::transmute::<&[libc::c_char], &[u8]>(&self.addr.sun_path) };
+
+        // macOS seems to return a len of 16 and a zeroed sun_path for unnamed addresses
+        if len == 0
+            || (cfg!(not(any(target_os = "linux", target_os = "android")))
+                && self.addr.sun_path[0] == 0)
+        {
+            AddressKind::Unnamed
+        } else if self.addr.sun_path[0] == 0 {
+            AddressKind::Abstract(&path[1..len])
+        } else {
+            AddressKind::Pathname(OsStr::from_bytes(&path[..len - 1]).as_ref())
+        }
+    }
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl fmt::Debug for SocketAddr {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self.address() {
+            AddressKind::Unnamed => write!(fmt, "(unnamed)"),
+            AddressKind::Abstract(name) => write!(fmt, "{} (abstract)", AsciiEscaped(name)),
+            AddressKind::Pathname(path) => write!(fmt, "{:?} (pathname)", path),
+        }
+    }
+}
diff --git a/library/std/src/sys/unix/ext/net/ancillary.rs b/library/std/src/sys/unix/ext/net/ancillary.rs
new file mode 100644
index 00000000000..2c91ba70dd0
--- /dev/null
+++ b/library/std/src/sys/unix/ext/net/ancillary.rs
@@ -0,0 +1,660 @@
+use super::{sockaddr_un, SocketAddr};
+use crate::convert::TryFrom;
+use crate::io::{self, IoSliceMut};
+use crate::marker::PhantomData;
+use crate::mem::{size_of, zeroed};
+use crate::os::unix::io::RawFd;
+use crate::path::Path;
+#[cfg(target_os = "android")]
+use crate::ptr::eq;
+use crate::ptr::read_unaligned;
+use crate::slice::from_raw_parts;
+use crate::sys::net::Socket;
+
+// FIXME(#43348): Make libc adapt #[doc(cfg(...))] so we don't need these fake definitions here?
+#[cfg(all(doc, not(target_os = "linux"), not(target_os = "android")))]
+#[allow(non_camel_case_types)]
+mod libc {
+    pub use libc::c_int;
+    pub struct ucred;
+    pub struct cmsghdr;
+    pub type pid_t = i32;
+    pub type gid_t = u32;
+    pub type uid_t = u32;
+}
+
+pub(super) fn recv_vectored_with_ancillary_from(
+    socket: &Socket,
+    bufs: &mut [IoSliceMut<'_>],
+    ancillary: &mut SocketAncillary<'_>,
+) -> io::Result<(usize, bool, io::Result<SocketAddr>)> {
+    unsafe {
+        let mut msg_name: libc::sockaddr_un = zeroed();
+
+        let mut msg: libc::msghdr = zeroed();
+        msg.msg_name = &mut msg_name as *mut _ as *mut _;
+        msg.msg_namelen = size_of::<libc::sockaddr_un>() as libc::socklen_t;
+        msg.msg_iov = bufs.as_mut_ptr().cast();
+        msg.msg_control = ancillary.buffer.as_mut_ptr().cast();
+        cfg_if::cfg_if! {
+            if #[cfg(any(target_os = "android", all(target_os = "linux", target_env = "gnu")))] {
+                msg.msg_iovlen = bufs.len() as libc::size_t;
+                msg.msg_controllen = ancillary.buffer.len() as libc::size_t;
+            } else if #[cfg(any(
+                          target_os = "dragonfly",
+                          target_os = "emscripten",
+                          target_os = "freebsd",
+                          all(target_os = "linux", target_env = "musl",),
+                          target_os = "netbsd",
+                          target_os = "openbsd",
+                      ))] {
+                msg.msg_iovlen = bufs.len() as libc::c_int;
+                msg.msg_controllen = ancillary.buffer.len() as libc::socklen_t;
+            }
+        }
+
+        let count = socket.recv_msg(&mut msg)?;
+
+        ancillary.length = msg.msg_controllen as usize;
+        ancillary.truncated = msg.msg_flags & libc::MSG_CTRUNC == libc::MSG_CTRUNC;
+
+        let truncated = msg.msg_flags & libc::MSG_TRUNC == libc::MSG_TRUNC;
+        let addr = SocketAddr::from_parts(msg_name, msg.msg_namelen);
+
+        Ok((count, truncated, addr))
+    }
+}
+
+pub(super) fn send_vectored_with_ancillary_to(
+    socket: &Socket,
+    path: Option<&Path>,
+    bufs: &mut [IoSliceMut<'_>],
+    ancillary: &mut SocketAncillary<'_>,
+) -> io::Result<usize> {
+    unsafe {
+        let (mut msg_name, msg_namelen) =
+            if let Some(path) = path { sockaddr_un(path)? } else { (zeroed(), 0) };
+
+        let mut msg: libc::msghdr = zeroed();
+        msg.msg_name = &mut msg_name as *mut _ as *mut _;
+        msg.msg_namelen = msg_namelen;
+        msg.msg_iov = bufs.as_mut_ptr().cast();
+        msg.msg_control = ancillary.buffer.as_mut_ptr().cast();
+        cfg_if::cfg_if! {
+            if #[cfg(any(target_os = "android", all(target_os = "linux", target_env = "gnu")))] {
+                msg.msg_iovlen = bufs.len() as libc::size_t;
+                msg.msg_controllen = ancillary.length as libc::size_t;
+            } else if #[cfg(any(
+                          target_os = "dragonfly",
+                          target_os = "emscripten",
+                          target_os = "freebsd",
+                          all(target_os = "linux", target_env = "musl",),
+                          target_os = "netbsd",
+                          target_os = "openbsd",
+                      ))] {
+                msg.msg_iovlen = bufs.len() as libc::c_int;
+                msg.msg_controllen = ancillary.length as libc::socklen_t;
+            }
+        }
+
+        ancillary.truncated = false;
+
+        socket.send_msg(&mut msg)
+    }
+}
+
+fn add_to_ancillary_data<T>(
+    buffer: &mut [u8],
+    length: &mut usize,
+    source: &[T],
+    cmsg_level: libc::c_int,
+    cmsg_type: libc::c_int,
+) -> bool {
+    let source_len = if let Some(source_len) = source.len().checked_mul(size_of::<T>()) {
+        if let Ok(source_len) = u32::try_from(source_len) {
+            source_len
+        } else {
+            return false;
+        }
+    } else {
+        return false;
+    };
+
+    unsafe {
+        let additional_space = libc::CMSG_SPACE(source_len) as usize;
+
+        let new_length = if let Some(new_length) = additional_space.checked_add(*length) {
+            new_length
+        } else {
+            return false;
+        };
+
+        if new_length > buffer.len() {
+            return false;
+        }
+
+        buffer[*length..new_length].fill(0);
+
+        *length = new_length;
+
+        let mut msg: libc::msghdr = zeroed();
+        msg.msg_control = buffer.as_mut_ptr().cast();
+        cfg_if::cfg_if! {
+            if #[cfg(any(target_os = "android", all(target_os = "linux", target_env = "gnu")))] {
+                msg.msg_controllen = *length as libc::size_t;
+            } else if #[cfg(any(
+                          target_os = "dragonfly",
+                          target_os = "emscripten",
+                          target_os = "freebsd",
+                          all(target_os = "linux", target_env = "musl",),
+                          target_os = "netbsd",
+                          target_os = "openbsd",
+                      ))] {
+                msg.msg_controllen = *length as libc::socklen_t;
+            }
+        }
+
+        let mut cmsg = libc::CMSG_FIRSTHDR(&msg);
+        let mut previous_cmsg = cmsg;
+        while !cmsg.is_null() {
+            previous_cmsg = cmsg;
+            cmsg = libc::CMSG_NXTHDR(&msg, cmsg);
+            cfg_if::cfg_if! {
+                // Android return the same pointer if it is the last cmsg.
+                // Therefore, check it if the previous pointer is the same as the current one.
+                if #[cfg(target_os = "android")] {
+                    if cmsg == previous_cmsg {
+                        break;
+                    }
+                }
+            }
+        }
+
+        if previous_cmsg.is_null() {
+            return false;
+        }
+
+        (*previous_cmsg).cmsg_level = cmsg_level;
+        (*previous_cmsg).cmsg_type = cmsg_type;
+        cfg_if::cfg_if! {
+            if #[cfg(any(target_os = "android", all(target_os = "linux", target_env = "gnu")))] {
+                (*previous_cmsg).cmsg_len = libc::CMSG_LEN(source_len) as libc::size_t;
+            } else if #[cfg(any(
+                          target_os = "dragonfly",
+                          target_os = "emscripten",
+                          target_os = "freebsd",
+                          all(target_os = "linux", target_env = "musl",),
+                          target_os = "netbsd",
+                          target_os = "openbsd",
+                      ))] {
+                (*previous_cmsg).cmsg_len = libc::CMSG_LEN(source_len) as libc::socklen_t;
+            }
+        }
+
+        let data = libc::CMSG_DATA(previous_cmsg).cast();
+
+        libc::memcpy(data, source.as_ptr().cast(), source_len as usize);
+    }
+    true
+}
+
+struct AncillaryDataIter<'a, T> {
+    data: &'a [u8],
+    phantom: PhantomData<T>,
+}
+
+impl<'a, T> AncillaryDataIter<'a, T> {
+    /// Create `AncillaryDataIter` struct to iterate through the data unit in the control message.
+    ///
+    /// # Safety
+    ///
+    /// `data` must contain a valid control message.
+    unsafe fn new(data: &'a [u8]) -> AncillaryDataIter<'a, T> {
+        AncillaryDataIter { data, phantom: PhantomData }
+    }
+}
+
+impl<'a, T> Iterator for AncillaryDataIter<'a, T> {
+    type Item = T;
+
+    fn next(&mut self) -> Option<T> {
+        if size_of::<T>() <= self.data.len() {
+            unsafe {
+                let unit = read_unaligned(self.data.as_ptr().cast());
+                self.data = &self.data[size_of::<T>()..];
+                Some(unit)
+            }
+        } else {
+            None
+        }
+    }
+}
+
+/// Unix credential.
+#[cfg(any(doc, target_os = "android", target_os = "linux",))]
+#[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+#[derive(Clone)]
+pub struct SocketCred(libc::ucred);
+
+#[cfg(any(doc, target_os = "android", target_os = "linux",))]
+impl SocketCred {
+    /// Create a Unix credential struct.
+    ///
+    /// PID, UID and GID is set to 0.
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn new() -> SocketCred {
+        SocketCred(libc::ucred { pid: 0, uid: 0, gid: 0 })
+    }
+
+    /// Set the PID.
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn set_pid(&mut self, pid: libc::pid_t) {
+        self.0.pid = pid;
+    }
+
+    /// Get the current PID.
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn get_pid(&self) -> libc::pid_t {
+        self.0.pid
+    }
+
+    /// Set the UID.
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn set_uid(&mut self, uid: libc::uid_t) {
+        self.0.uid = uid;
+    }
+
+    /// Get the current UID.
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn get_uid(&self) -> libc::uid_t {
+        self.0.uid
+    }
+
+    /// Set the GID.
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn set_gid(&mut self, gid: libc::gid_t) {
+        self.0.gid = gid;
+    }
+
+    /// Get the current GID.
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn get_gid(&self) -> libc::gid_t {
+        self.0.gid
+    }
+}
+
+/// This control message contains file descriptors.
+///
+/// The level is equal to `SOL_SOCKET` and the type is equal to `SCM_RIGHTS`.
+#[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+pub struct ScmRights<'a>(AncillaryDataIter<'a, RawFd>);
+
+#[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+impl<'a> Iterator for ScmRights<'a> {
+    type Item = RawFd;
+
+    fn next(&mut self) -> Option<RawFd> {
+        self.0.next()
+    }
+}
+
+/// This control message contains unix credentials.
+///
+/// The level is equal to `SOL_SOCKET` and the type is equal to `SCM_CREDENTIALS` or `SCM_CREDS`.
+#[cfg(any(doc, target_os = "android", target_os = "linux",))]
+#[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+pub struct ScmCredentials<'a>(AncillaryDataIter<'a, libc::ucred>);
+
+#[cfg(any(doc, target_os = "android", target_os = "linux",))]
+#[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+impl<'a> Iterator for ScmCredentials<'a> {
+    type Item = SocketCred;
+
+    fn next(&mut self) -> Option<SocketCred> {
+        Some(SocketCred(self.0.next()?))
+    }
+}
+
+/// The error type which is returned from parsing the type a control message.
+#[non_exhaustive]
+#[derive(Debug)]
+#[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+pub enum AncillaryError {
+    Unknown { cmsg_level: i32, cmsg_type: i32 },
+}
+
+/// This enum represent one control message of variable type.
+#[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+pub enum AncillaryData<'a> {
+    ScmRights(ScmRights<'a>),
+    #[cfg(any(doc, target_os = "android", target_os = "linux",))]
+    ScmCredentials(ScmCredentials<'a>),
+}
+
+impl<'a> AncillaryData<'a> {
+    /// Create a `AncillaryData::ScmRights` variant.
+    ///
+    /// # Safety
+    ///
+    /// `data` must contain a valid control message and the control message must be type of
+    /// `SOL_SOCKET` and level of `SCM_RIGHTS`.
+    unsafe fn as_rights(data: &'a [u8]) -> Self {
+        let ancillary_data_iter = AncillaryDataIter::new(data);
+        let scm_rights = ScmRights(ancillary_data_iter);
+        AncillaryData::ScmRights(scm_rights)
+    }
+
+    /// Create a `AncillaryData::ScmCredentials` variant.
+    ///
+    /// # Safety
+    ///
+    /// `data` must contain a valid control message and the control message must be type of
+    /// `SOL_SOCKET` and level of `SCM_CREDENTIALS` or `SCM_CREDENTIALS`.
+    #[cfg(any(doc, target_os = "android", target_os = "linux",))]
+    unsafe fn as_credentials(data: &'a [u8]) -> Self {
+        let ancillary_data_iter = AncillaryDataIter::new(data);
+        let scm_credentials = ScmCredentials(ancillary_data_iter);
+        AncillaryData::ScmCredentials(scm_credentials)
+    }
+
+    fn try_from_cmsghdr(cmsg: &'a libc::cmsghdr) -> Result<Self, AncillaryError> {
+        unsafe {
+            cfg_if::cfg_if! {
+                if #[cfg(any(target_os = "android", all(target_os = "linux", target_env = "gnu")))] {
+                    let cmsg_len_zero = libc::CMSG_LEN(0) as libc::size_t;
+                } else if #[cfg(any(
+                              target_os = "dragonfly",
+                              target_os = "emscripten",
+                              target_os = "freebsd",
+                              all(target_os = "linux", target_env = "musl",),
+                              target_os = "netbsd",
+                              target_os = "openbsd",
+                          ))] {
+                    let cmsg_len_zero = libc::CMSG_LEN(0) as libc::socklen_t;
+                }
+            }
+            let data_len = (*cmsg).cmsg_len - cmsg_len_zero;
+            let data = libc::CMSG_DATA(cmsg).cast();
+            let data = from_raw_parts(data, data_len as usize);
+
+            match (*cmsg).cmsg_level {
+                libc::SOL_SOCKET => match (*cmsg).cmsg_type {
+                    libc::SCM_RIGHTS => Ok(AncillaryData::as_rights(data)),
+                    #[cfg(any(target_os = "android", target_os = "linux",))]
+                    libc::SCM_CREDENTIALS => Ok(AncillaryData::as_credentials(data)),
+                    cmsg_type => {
+                        Err(AncillaryError::Unknown { cmsg_level: libc::SOL_SOCKET, cmsg_type })
+                    }
+                },
+                cmsg_level => {
+                    Err(AncillaryError::Unknown { cmsg_level, cmsg_type: (*cmsg).cmsg_type })
+                }
+            }
+        }
+    }
+}
+
+/// This struct is used to iterate through the control messages.
+#[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+pub struct Messages<'a> {
+    buffer: &'a [u8],
+    current: Option<&'a libc::cmsghdr>,
+}
+
+#[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+impl<'a> Iterator for Messages<'a> {
+    type Item = Result<AncillaryData<'a>, AncillaryError>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        unsafe {
+            let mut msg: libc::msghdr = zeroed();
+            msg.msg_control = self.buffer.as_ptr() as *mut _;
+            cfg_if::cfg_if! {
+                if #[cfg(any(target_os = "android", all(target_os = "linux", target_env = "gnu")))] {
+                    msg.msg_controllen = self.buffer.len() as libc::size_t;
+                } else if #[cfg(any(
+                              target_os = "dragonfly",
+                              target_os = "emscripten",
+                              target_os = "freebsd",
+                              all(target_os = "linux", target_env = "musl",),
+                              target_os = "netbsd",
+                              target_os = "openbsd",
+                          ))] {
+                    msg.msg_controllen = self.buffer.len() as libc::socklen_t;
+                }
+            }
+
+            let cmsg = if let Some(current) = self.current {
+                libc::CMSG_NXTHDR(&msg, current)
+            } else {
+                libc::CMSG_FIRSTHDR(&msg)
+            };
+
+            let cmsg = cmsg.as_ref()?;
+            cfg_if::cfg_if! {
+                // Android return the same pointer if it is the last cmsg.
+                // Therefore, check it if the previous pointer is the same as the current one.
+                if #[cfg(target_os = "android")] {
+                    if let Some(current) = self.current {
+                        if eq(current, cmsg) {
+                            return None;
+                        }
+                    }
+                }
+            }
+
+            self.current = Some(cmsg);
+            let ancillary_result = AncillaryData::try_from_cmsghdr(cmsg);
+            Some(ancillary_result)
+        }
+    }
+}
+
+/// A Unix socket Ancillary data struct.
+///
+/// # Example
+/// ```no_run
+/// #![feature(unix_socket_ancillary_data)]
+/// use std::os::unix::net::{UnixStream, SocketAncillary, AncillaryData};
+/// use std::io::IoSliceMut;
+///
+/// fn main() -> std::io::Result<()> {
+///     let sock = UnixStream::connect("/tmp/sock")?;
+///
+///     let mut fds = [0; 8];
+///     let mut ancillary_buffer = [0; 128];
+///     let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
+///
+///     let mut buf = [1; 8];
+///     let mut bufs = &mut [IoSliceMut::new(&mut buf[..])][..];
+///     sock.recv_vectored_with_ancillary(bufs, &mut ancillary)?;
+///
+///     for ancillary_result in ancillary.messages() {
+///         if let AncillaryData::ScmRights(scm_rights) = ancillary_result.unwrap() {
+///             for fd in scm_rights {
+///                 println!("receive file descriptor: {}", fd);
+///             }
+///         }
+///     }
+///     Ok(())
+/// }
+/// ```
+#[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+#[derive(Debug)]
+pub struct SocketAncillary<'a> {
+    buffer: &'a mut [u8],
+    length: usize,
+    truncated: bool,
+}
+
+impl<'a> SocketAncillary<'a> {
+    /// Create an ancillary data with the given buffer.
+    ///
+    /// # Example
+    ///
+    /// ```no_run
+    /// # #![allow(unused_mut)]
+    /// #![feature(unix_socket_ancillary_data)]
+    /// use std::os::unix::net::SocketAncillary;
+    /// let mut ancillary_buffer = [0; 128];
+    /// let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
+    /// ```
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn new(buffer: &'a mut [u8]) -> Self {
+        SocketAncillary { buffer, length: 0, truncated: false }
+    }
+
+    /// Returns the capacity of the buffer.
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn capacity(&self) -> usize {
+        self.buffer.len()
+    }
+
+    /// Returns the number of used bytes.
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn len(&self) -> usize {
+        self.length
+    }
+
+    /// Returns the iterator of the control messages.
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn messages(&self) -> Messages<'_> {
+        Messages { buffer: &self.buffer[..self.length], current: None }
+    }
+
+    /// Is `true` if during a recv operation the ancillary was truncated.
+    ///
+    /// # Example
+    ///
+    /// ```no_run
+    /// #![feature(unix_socket_ancillary_data)]
+    /// use std::os::unix::net::{UnixStream, SocketAncillary};
+    /// use std::io::IoSliceMut;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixStream::connect("/tmp/sock")?;
+    ///
+    ///     let mut ancillary_buffer = [0; 128];
+    ///     let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
+    ///
+    ///     let mut buf = [1; 8];
+    ///     let mut bufs = &mut [IoSliceMut::new(&mut buf[..])][..];
+    ///     sock.recv_vectored_with_ancillary(bufs, &mut ancillary)?;
+    ///
+    ///     println!("Is truncated: {}", ancillary.truncated());
+    ///     Ok(())
+    /// }
+    /// ```
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn truncated(&self) -> bool {
+        self.truncated
+    }
+
+    /// Add file descriptors to the ancillary data.
+    ///
+    /// The function returns `true` if there was enough space in the buffer.
+    /// If there was not enough space then no file descriptors was appended.
+    /// Technically, that means this operation adds a control message with the level `SOL_SOCKET`
+    /// and type `SCM_RIGHTS`.
+    ///
+    /// # Example
+    ///
+    /// ```no_run
+    /// #![feature(unix_socket_ancillary_data)]
+    /// use std::os::unix::net::{UnixStream, SocketAncillary};
+    /// use std::os::unix::io::AsRawFd;
+    /// use std::io::IoSliceMut;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixStream::connect("/tmp/sock")?;
+    ///
+    ///     let mut ancillary_buffer = [0; 128];
+    ///     let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
+    ///     ancillary.add_fds(&[sock.as_raw_fd()][..]);
+    ///
+    ///     let mut buf = [1; 8];
+    ///     let mut bufs = &mut [IoSliceMut::new(&mut buf[..])][..];
+    ///     sock.send_vectored_with_ancillary(bufs, &mut ancillary)?;
+    ///     Ok(())
+    /// }
+    /// ```
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn add_fds(&mut self, fds: &[RawFd]) -> bool {
+        self.truncated = false;
+        add_to_ancillary_data(
+            &mut self.buffer,
+            &mut self.length,
+            fds,
+            libc::SOL_SOCKET,
+            libc::SCM_RIGHTS,
+        )
+    }
+
+    /// Add credentials to the ancillary data.
+    ///
+    /// The function returns `true` if there was enough space in the buffer.
+    /// If there was not enough space then no credentials was appended.
+    /// Technically, that means this operation adds a control message with the level `SOL_SOCKET`
+    /// and type `SCM_CREDENTIALS` or `SCM_CREDS`.
+    ///
+    #[cfg(any(doc, target_os = "android", target_os = "linux",))]
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn add_creds(&mut self, creds: &[SocketCred]) -> bool {
+        self.truncated = false;
+        add_to_ancillary_data(
+            &mut self.buffer,
+            &mut self.length,
+            creds,
+            libc::SOL_SOCKET,
+            libc::SCM_CREDENTIALS,
+        )
+    }
+
+    /// Clears the ancillary data, removing all values.
+    ///
+    /// # Example
+    ///
+    /// ```no_run
+    /// #![feature(unix_socket_ancillary_data)]
+    /// use std::os::unix::net::{UnixStream, SocketAncillary, AncillaryData};
+    /// use std::io::IoSliceMut;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixStream::connect("/tmp/sock")?;
+    ///
+    ///     let mut fds1 = [0; 8];
+    ///     let mut fds2 = [0; 8];
+    ///     let mut ancillary_buffer = [0; 128];
+    ///     let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
+    ///
+    ///     let mut buf = [1; 8];
+    ///     let mut bufs = &mut [IoSliceMut::new(&mut buf[..])][..];
+    ///
+    ///     sock.recv_vectored_with_ancillary(bufs, &mut ancillary)?;
+    ///     for ancillary_result in ancillary.messages() {
+    ///         if let AncillaryData::ScmRights(scm_rights) = ancillary_result.unwrap() {
+    ///             for fd in scm_rights {
+    ///                 println!("receive file descriptor: {}", fd);
+    ///             }
+    ///         }
+    ///     }
+    ///
+    ///     ancillary.clear();
+    ///
+    ///     sock.recv_vectored_with_ancillary(bufs, &mut ancillary)?;
+    ///     for ancillary_result in ancillary.messages() {
+    ///         if let AncillaryData::ScmRights(scm_rights) = ancillary_result.unwrap() {
+    ///             for fd in scm_rights {
+    ///                 println!("receive file descriptor: {}", fd);
+    ///             }
+    ///         }
+    ///     }
+    ///     Ok(())
+    /// }
+    /// ```
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn clear(&mut self) {
+        self.length = 0;
+        self.truncated = false;
+    }
+}
diff --git a/library/std/src/sys/unix/ext/net/datagram.rs b/library/std/src/sys/unix/ext/net/datagram.rs
new file mode 100644
index 00000000000..0f532c47c8f
--- /dev/null
+++ b/library/std/src/sys/unix/ext/net/datagram.rs
@@ -0,0 +1,897 @@
+#[cfg(any(
+    doc,
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "freebsd",
+    target_os = "linux",
+    target_os = "netbsd",
+    target_os = "openbsd",
+))]
+use super::{recv_vectored_with_ancillary_from, send_vectored_with_ancillary_to, SocketAncillary};
+use super::{sockaddr_un, SocketAddr};
+#[cfg(any(
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "freebsd",
+    target_os = "linux",
+    target_os = "netbsd",
+    target_os = "openbsd",
+))]
+use crate::io::IoSliceMut;
+use crate::net::Shutdown;
+use crate::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+use crate::path::Path;
+use crate::sys::cvt;
+use crate::sys::net::Socket;
+use crate::sys_common::{AsInner, FromInner, IntoInner};
+use crate::time::Duration;
+use crate::{fmt, io};
+
+#[cfg(any(
+    target_os = "linux",
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "freebsd",
+    target_os = "openbsd",
+    target_os = "netbsd",
+    target_os = "haiku"
+))]
+use libc::MSG_NOSIGNAL;
+#[cfg(not(any(
+    target_os = "linux",
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "freebsd",
+    target_os = "openbsd",
+    target_os = "netbsd",
+    target_os = "haiku"
+)))]
+const MSG_NOSIGNAL: libc::c_int = 0x0;
+
+/// A Unix datagram socket.
+///
+/// # Examples
+///
+/// ```no_run
+/// use std::os::unix::net::UnixDatagram;
+///
+/// fn main() -> std::io::Result<()> {
+///     let socket = UnixDatagram::bind("/path/to/my/socket")?;
+///     socket.send_to(b"hello world", "/path/to/other/socket")?;
+///     let mut buf = [0; 100];
+///     let (count, address) = socket.recv_from(&mut buf)?;
+///     println!("socket {:?} sent {:?}", address, &buf[..count]);
+///     Ok(())
+/// }
+/// ```
+#[stable(feature = "unix_socket", since = "1.10.0")]
+pub struct UnixDatagram(Socket);
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl fmt::Debug for UnixDatagram {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let mut builder = fmt.debug_struct("UnixDatagram");
+        builder.field("fd", self.0.as_inner());
+        if let Ok(addr) = self.local_addr() {
+            builder.field("local", &addr);
+        }
+        if let Ok(addr) = self.peer_addr() {
+            builder.field("peer", &addr);
+        }
+        builder.finish()
+    }
+}
+
+impl UnixDatagram {
+    /// Creates a Unix datagram socket bound to the given path.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// let sock = match UnixDatagram::bind("/path/to/the/socket") {
+    ///     Ok(sock) => sock,
+    ///     Err(e) => {
+    ///         println!("Couldn't bind: {:?}", e);
+    ///         return
+    ///     }
+    /// };
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn bind<P: AsRef<Path>>(path: P) -> io::Result<UnixDatagram> {
+        unsafe {
+            let socket = UnixDatagram::unbound()?;
+            let (addr, len) = sockaddr_un(path.as_ref())?;
+
+            cvt(libc::bind(*socket.0.as_inner(), &addr as *const _ as *const _, len as _))?;
+
+            Ok(socket)
+        }
+    }
+
+    /// Creates a Unix Datagram socket which is not bound to any address.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// let sock = match UnixDatagram::unbound() {
+    ///     Ok(sock) => sock,
+    ///     Err(e) => {
+    ///         println!("Couldn't unbound: {:?}", e);
+    ///         return
+    ///     }
+    /// };
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn unbound() -> io::Result<UnixDatagram> {
+        let inner = Socket::new_raw(libc::AF_UNIX, libc::SOCK_DGRAM)?;
+        Ok(UnixDatagram(inner))
+    }
+
+    /// Creates an unnamed pair of connected sockets.
+    ///
+    /// Returns two `UnixDatagrams`s which are connected to each other.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// let (sock1, sock2) = match UnixDatagram::pair() {
+    ///     Ok((sock1, sock2)) => (sock1, sock2),
+    ///     Err(e) => {
+    ///         println!("Couldn't unbound: {:?}", e);
+    ///         return
+    ///     }
+    /// };
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn pair() -> io::Result<(UnixDatagram, UnixDatagram)> {
+        let (i1, i2) = Socket::new_pair(libc::AF_UNIX, libc::SOCK_DGRAM)?;
+        Ok((UnixDatagram(i1), UnixDatagram(i2)))
+    }
+
+    /// Connects the socket to the specified address.
+    ///
+    /// The [`send`] method may be used to send data to the specified address.
+    /// [`recv`] and [`recv_from`] will only receive data from that address.
+    ///
+    /// [`send`]: UnixDatagram::send
+    /// [`recv`]: UnixDatagram::recv
+    /// [`recv_from`]: UnixDatagram::recv_from
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     match sock.connect("/path/to/the/socket") {
+    ///         Ok(sock) => sock,
+    ///         Err(e) => {
+    ///             println!("Couldn't connect: {:?}", e);
+    ///             return Err(e)
+    ///         }
+    ///     };
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn connect<P: AsRef<Path>>(&self, path: P) -> io::Result<()> {
+        unsafe {
+            let (addr, len) = sockaddr_un(path.as_ref())?;
+
+            cvt(libc::connect(*self.0.as_inner(), &addr as *const _ as *const _, len))?;
+        }
+        Ok(())
+    }
+
+    /// Creates a new independently owned handle to the underlying socket.
+    ///
+    /// The returned `UnixDatagram` is a reference to the same socket that this
+    /// object references. Both handles can be used to accept incoming
+    /// connections and options set on one side will affect the other.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::bind("/path/to/the/socket")?;
+    ///     let sock_copy = sock.try_clone().expect("try_clone failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn try_clone(&self) -> io::Result<UnixDatagram> {
+        self.0.duplicate().map(UnixDatagram)
+    }
+
+    /// Returns the address of this socket.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::bind("/path/to/the/socket")?;
+    ///     let addr = sock.local_addr().expect("Couldn't get local address");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn local_addr(&self) -> io::Result<SocketAddr> {
+        SocketAddr::new(|addr, len| unsafe { libc::getsockname(*self.0.as_inner(), addr, len) })
+    }
+
+    /// Returns the address of this socket's peer.
+    ///
+    /// The [`connect`] method will connect the socket to a peer.
+    ///
+    /// [`connect`]: UnixDatagram::connect
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     sock.connect("/path/to/the/socket")?;
+    ///
+    ///     let addr = sock.peer_addr().expect("Couldn't get peer address");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn peer_addr(&self) -> io::Result<SocketAddr> {
+        SocketAddr::new(|addr, len| unsafe { libc::getpeername(*self.0.as_inner(), addr, len) })
+    }
+
+    fn recv_from_flags(
+        &self,
+        buf: &mut [u8],
+        flags: libc::c_int,
+    ) -> io::Result<(usize, SocketAddr)> {
+        let mut count = 0;
+        let addr = SocketAddr::new(|addr, len| unsafe {
+            count = libc::recvfrom(
+                *self.0.as_inner(),
+                buf.as_mut_ptr() as *mut _,
+                buf.len(),
+                flags,
+                addr,
+                len,
+            );
+            if count > 0 {
+                1
+            } else if count == 0 {
+                0
+            } else {
+                -1
+            }
+        })?;
+
+        Ok((count as usize, addr))
+    }
+
+    /// Receives data from the socket.
+    ///
+    /// On success, returns the number of bytes read and the address from
+    /// whence the data came.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     let mut buf = vec![0; 10];
+    ///     let (size, sender) = sock.recv_from(buf.as_mut_slice())?;
+    ///     println!("received {} bytes from {:?}", size, sender);
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
+        self.recv_from_flags(buf, 0)
+    }
+
+    /// Receives data from the socket.
+    ///
+    /// On success, returns the number of bytes read.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::bind("/path/to/the/socket")?;
+    ///     let mut buf = vec![0; 10];
+    ///     sock.recv(buf.as_mut_slice()).expect("recv function failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn recv(&self, buf: &mut [u8]) -> io::Result<usize> {
+        self.0.read(buf)
+    }
+
+    /// Receives data and ancillary data from socket.
+    ///
+    /// On success, returns the number of bytes read, if the data was truncated and the address from whence the msg came.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// #![feature(unix_socket_ancillary_data)]
+    /// use std::os::unix::net::{UnixDatagram, SocketAncillary, AncillaryData};
+    /// use std::io::IoSliceMut;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     let mut buf1 = [1; 8];
+    ///     let mut buf2 = [2; 16];
+    ///     let mut buf3 = [3; 8];
+    ///     let mut bufs = &mut [
+    ///         IoSliceMut::new(&mut buf1),
+    ///         IoSliceMut::new(&mut buf2),
+    ///         IoSliceMut::new(&mut buf3),
+    ///     ][..];
+    ///     let mut fds = [0; 8];
+    ///     let mut ancillary_buffer = [0; 128];
+    ///     let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
+    ///     let (size, _truncated, sender) = sock.recv_vectored_with_ancillary_from(bufs, &mut ancillary)?;
+    ///     println!("received {}", size);
+    ///     for ancillary_result in ancillary.messages() {
+    ///         if let AncillaryData::ScmRights(scm_rights) = ancillary_result.unwrap() {
+    ///             for fd in scm_rights {
+    ///                 println!("receive file descriptor: {}", fd);
+    ///             }
+    ///         }
+    ///     }
+    ///     Ok(())
+    /// }
+    /// ```
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "emscripten",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn recv_vectored_with_ancillary_from(
+        &self,
+        bufs: &mut [IoSliceMut<'_>],
+        ancillary: &mut SocketAncillary<'_>,
+    ) -> io::Result<(usize, bool, SocketAddr)> {
+        let (count, truncated, addr) = recv_vectored_with_ancillary_from(&self.0, bufs, ancillary)?;
+        let addr = addr?;
+
+        Ok((count, truncated, addr))
+    }
+
+    /// Receives data and ancillary data from socket.
+    ///
+    /// On success, returns the number of bytes read and if the data was truncated.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// #![feature(unix_socket_ancillary_data)]
+    /// use std::os::unix::net::{UnixDatagram, SocketAncillary, AncillaryData};
+    /// use std::io::IoSliceMut;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     let mut buf1 = [1; 8];
+    ///     let mut buf2 = [2; 16];
+    ///     let mut buf3 = [3; 8];
+    ///     let mut bufs = &mut [
+    ///         IoSliceMut::new(&mut buf1),
+    ///         IoSliceMut::new(&mut buf2),
+    ///         IoSliceMut::new(&mut buf3),
+    ///     ][..];
+    ///     let mut fds = [0; 8];
+    ///     let mut ancillary_buffer = [0; 128];
+    ///     let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
+    ///     let (size, _truncated) = sock.recv_vectored_with_ancillary(bufs, &mut ancillary)?;
+    ///     println!("received {}", size);
+    ///     for ancillary_result in ancillary.messages() {
+    ///         if let AncillaryData::ScmRights(scm_rights) = ancillary_result.unwrap() {
+    ///             for fd in scm_rights {
+    ///                 println!("receive file descriptor: {}", fd);
+    ///             }
+    ///         }
+    ///     }
+    ///     Ok(())
+    /// }
+    /// ```
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "emscripten",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn recv_vectored_with_ancillary(
+        &self,
+        bufs: &mut [IoSliceMut<'_>],
+        ancillary: &mut SocketAncillary<'_>,
+    ) -> io::Result<(usize, bool)> {
+        let (count, truncated, addr) = recv_vectored_with_ancillary_from(&self.0, bufs, ancillary)?;
+        addr?;
+
+        Ok((count, truncated))
+    }
+
+    /// Sends data on the socket to the specified address.
+    ///
+    /// On success, returns the number of bytes written.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     sock.send_to(b"omelette au fromage", "/some/sock").expect("send_to function failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn send_to<P: AsRef<Path>>(&self, buf: &[u8], path: P) -> io::Result<usize> {
+        unsafe {
+            let (addr, len) = sockaddr_un(path.as_ref())?;
+
+            let count = cvt(libc::sendto(
+                *self.0.as_inner(),
+                buf.as_ptr() as *const _,
+                buf.len(),
+                MSG_NOSIGNAL,
+                &addr as *const _ as *const _,
+                len,
+            ))?;
+            Ok(count as usize)
+        }
+    }
+
+    /// 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.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     sock.connect("/some/sock").expect("Couldn't connect");
+    ///     sock.send(b"omelette au fromage").expect("send_to function failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn send(&self, buf: &[u8]) -> io::Result<usize> {
+        self.0.write(buf)
+    }
+
+    /// Sends data and ancillary data on the socket to the specified address.
+    ///
+    /// On success, returns the number of bytes written.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// #![feature(unix_socket_ancillary_data)]
+    /// use std::os::unix::net::{UnixDatagram, SocketAncillary};
+    /// use std::io::IoSliceMut;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     let mut buf1 = [1; 8];
+    ///     let mut buf2 = [2; 16];
+    ///     let mut buf3 = [3; 8];
+    ///     let mut bufs = &mut [
+    ///         IoSliceMut::new(&mut buf1),
+    ///         IoSliceMut::new(&mut buf2),
+    ///         IoSliceMut::new(&mut buf3),
+    ///     ][..];
+    ///     let fds = [0, 1, 2];
+    ///     let mut ancillary_buffer = [0; 128];
+    ///     let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
+    ///     ancillary.add_fds(&fds[..]);
+    ///     sock.send_vectored_with_ancillary_to(bufs, &mut ancillary, "/some/sock").expect("send_vectored_with_ancillary_to function failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "emscripten",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn send_vectored_with_ancillary_to<P: AsRef<Path>>(
+        &self,
+        bufs: &mut [IoSliceMut<'_>],
+        ancillary: &mut SocketAncillary<'_>,
+        path: P,
+    ) -> io::Result<usize> {
+        send_vectored_with_ancillary_to(&self.0, Some(path.as_ref()), bufs, ancillary)
+    }
+
+    /// Sends data and ancillary data on the socket.
+    ///
+    /// On success, returns the number of bytes written.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// #![feature(unix_socket_ancillary_data)]
+    /// use std::os::unix::net::{UnixDatagram, SocketAncillary};
+    /// use std::io::IoSliceMut;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     let mut buf1 = [1; 8];
+    ///     let mut buf2 = [2; 16];
+    ///     let mut buf3 = [3; 8];
+    ///     let mut bufs = &mut [
+    ///         IoSliceMut::new(&mut buf1),
+    ///         IoSliceMut::new(&mut buf2),
+    ///         IoSliceMut::new(&mut buf3),
+    ///     ][..];
+    ///     let fds = [0, 1, 2];
+    ///     let mut ancillary_buffer = [0; 128];
+    ///     let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
+    ///     ancillary.add_fds(&fds[..]);
+    ///     sock.send_vectored_with_ancillary(bufs, &mut ancillary).expect("send_vectored_with_ancillary function failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "emscripten",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn send_vectored_with_ancillary(
+        &self,
+        bufs: &mut [IoSliceMut<'_>],
+        ancillary: &mut SocketAncillary<'_>,
+    ) -> io::Result<usize> {
+        send_vectored_with_ancillary_to(&self.0, None, bufs, ancillary)
+    }
+
+    /// Sets the read timeout for the socket.
+    ///
+    /// If the provided value is [`None`], then [`recv`] and [`recv_from`] calls will
+    /// block indefinitely. An [`Err`] is returned if the zero [`Duration`]
+    /// is passed to this method.
+    ///
+    /// [`recv`]: UnixDatagram::recv
+    /// [`recv_from`]: UnixDatagram::recv_from
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::os::unix::net::UnixDatagram;
+    /// use std::time::Duration;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     sock.set_read_timeout(Some(Duration::new(1, 0)))
+    ///         .expect("set_read_timeout function failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    ///
+    /// An [`Err`] is returned if the zero [`Duration`] is passed to this
+    /// method:
+    ///
+    /// ```no_run
+    /// use std::io;
+    /// use std::os::unix::net::UnixDatagram;
+    /// use std::time::Duration;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixDatagram::unbound()?;
+    ///     let result = socket.set_read_timeout(Some(Duration::new(0, 0)));
+    ///     let err = result.unwrap_err();
+    ///     assert_eq!(err.kind(), io::ErrorKind::InvalidInput);
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn set_read_timeout(&self, timeout: Option<Duration>) -> io::Result<()> {
+        self.0.set_timeout(timeout, libc::SO_RCVTIMEO)
+    }
+
+    /// Sets the write timeout for the socket.
+    ///
+    /// If the provided value is [`None`], then [`send`] and [`send_to`] calls will
+    /// block indefinitely. An [`Err`] is returned if the zero [`Duration`] is passed to this
+    /// method.
+    ///
+    /// [`send`]: UnixDatagram::send
+    /// [`send_to`]: UnixDatagram::send_to
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::os::unix::net::UnixDatagram;
+    /// use std::time::Duration;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     sock.set_write_timeout(Some(Duration::new(1, 0)))
+    ///         .expect("set_write_timeout function failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    ///
+    /// An [`Err`] is returned if the zero [`Duration`] is passed to this
+    /// method:
+    ///
+    /// ```no_run
+    /// use std::io;
+    /// use std::os::unix::net::UnixDatagram;
+    /// use std::time::Duration;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixDatagram::unbound()?;
+    ///     let result = socket.set_write_timeout(Some(Duration::new(0, 0)));
+    ///     let err = result.unwrap_err();
+    ///     assert_eq!(err.kind(), io::ErrorKind::InvalidInput);
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn set_write_timeout(&self, timeout: Option<Duration>) -> io::Result<()> {
+        self.0.set_timeout(timeout, libc::SO_SNDTIMEO)
+    }
+
+    /// Returns the read timeout of this socket.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::os::unix::net::UnixDatagram;
+    /// use std::time::Duration;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     sock.set_read_timeout(Some(Duration::new(1, 0)))
+    ///         .expect("set_read_timeout function failed");
+    ///     assert_eq!(sock.read_timeout()?, Some(Duration::new(1, 0)));
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn read_timeout(&self) -> io::Result<Option<Duration>> {
+        self.0.timeout(libc::SO_RCVTIMEO)
+    }
+
+    /// Returns the write timeout of this socket.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::os::unix::net::UnixDatagram;
+    /// use std::time::Duration;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     sock.set_write_timeout(Some(Duration::new(1, 0)))
+    ///         .expect("set_write_timeout function failed");
+    ///     assert_eq!(sock.write_timeout()?, Some(Duration::new(1, 0)));
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn write_timeout(&self) -> io::Result<Option<Duration>> {
+        self.0.timeout(libc::SO_SNDTIMEO)
+    }
+
+    /// Moves the socket into or out of nonblocking mode.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     sock.set_nonblocking(true).expect("set_nonblocking function failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
+        self.0.set_nonblocking(nonblocking)
+    }
+
+    /// Moves the socket to pass unix credentials as control message in [`SocketAncillary`].
+    ///
+    /// Set the socket option `SO_PASSCRED`.
+    ///
+    /// # Examples
+    ///
+    #[cfg_attr(any(target_os = "android", target_os = "linux"), doc = "```no_run")]
+    #[cfg_attr(not(any(target_os = "android", target_os = "linux")), doc = "```ignore")]
+    /// #![feature(unix_socket_ancillary_data)]
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     sock.set_passcred(true).expect("set_passcred function failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[cfg(any(doc, target_os = "android", target_os = "linux",))]
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn set_passcred(&self, passcred: bool) -> io::Result<()> {
+        self.0.set_passcred(passcred)
+    }
+
+    /// Get the current value of the socket for passing unix credentials in [`SocketAncillary`].
+    /// This value can be change by [`set_passcred`].
+    ///
+    /// Get the socket option `SO_PASSCRED`.
+    ///
+    /// [`set_passcred`]: UnixDatagram::set_passcred
+    #[cfg(any(doc, target_os = "android", target_os = "linux",))]
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn passcred(&self) -> io::Result<bool> {
+        self.0.passcred()
+    }
+
+    /// Returns the value of the `SO_ERROR` option.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     if let Ok(Some(err)) = sock.take_error() {
+    ///         println!("Got error: {:?}", err);
+    ///     }
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
+        self.0.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`]).
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixDatagram;
+    /// use std::net::Shutdown;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let sock = UnixDatagram::unbound()?;
+    ///     sock.shutdown(Shutdown::Both).expect("shutdown function failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
+        self.0.shutdown(how)
+    }
+
+    /// 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.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// #![feature(unix_socket_peek)]
+    ///
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixDatagram::bind("/tmp/sock")?;
+    ///     let mut buf = [0; 10];
+    ///     let len = socket.peek(&mut buf).expect("peek failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[unstable(feature = "unix_socket_peek", issue = "76923")]
+    pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
+        self.0.peek(buf)
+    }
+
+    /// Receives a single datagram message on the socket, without removing it from the
+    /// queue. On success, returns the number of bytes read and the origin.
+    ///
+    /// The function must be called with valid byte array `buf` of sufficient size to
+    /// hold the message bytes. If a message is too long to fit in the supplied buffer,
+    /// excess bytes may be discarded.
+    ///
+    /// Successive calls return the same data. This is accomplished by passing
+    /// `MSG_PEEK` as a flag to the underlying `recvfrom` system call.
+    ///
+    /// Do not use this function to implement busy waiting, instead use `libc::poll` to
+    /// synchronize IO events on one or more sockets.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// #![feature(unix_socket_peek)]
+    ///
+    /// use std::os::unix::net::UnixDatagram;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixDatagram::bind("/tmp/sock")?;
+    ///     let mut buf = [0; 10];
+    ///     let (len, addr) = socket.peek_from(&mut buf).expect("peek failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[unstable(feature = "unix_socket_peek", issue = "76923")]
+    pub fn peek_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
+        self.recv_from_flags(buf, libc::MSG_PEEK)
+    }
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl AsRawFd for UnixDatagram {
+    fn as_raw_fd(&self) -> RawFd {
+        *self.0.as_inner()
+    }
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl FromRawFd for UnixDatagram {
+    unsafe fn from_raw_fd(fd: RawFd) -> UnixDatagram {
+        UnixDatagram(Socket::from_inner(fd))
+    }
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl IntoRawFd for UnixDatagram {
+    fn into_raw_fd(self) -> RawFd {
+        self.0.into_inner()
+    }
+}
diff --git a/library/std/src/sys/unix/ext/net/listener.rs b/library/std/src/sys/unix/ext/net/listener.rs
new file mode 100644
index 00000000000..9803c6e2746
--- /dev/null
+++ b/library/std/src/sys/unix/ext/net/listener.rs
@@ -0,0 +1,319 @@
+use super::{sockaddr_un, SocketAddr, UnixStream};
+use crate::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+use crate::path::Path;
+use crate::sys::cvt;
+use crate::sys::net::Socket;
+use crate::sys_common::{AsInner, FromInner, IntoInner};
+use crate::{fmt, io, mem};
+
+/// A structure representing a Unix domain socket server.
+///
+/// # Examples
+///
+/// ```no_run
+/// use std::thread;
+/// use std::os::unix::net::{UnixStream, UnixListener};
+///
+/// fn handle_client(stream: UnixStream) {
+///     // ...
+/// }
+///
+/// fn main() -> std::io::Result<()> {
+///     let listener = UnixListener::bind("/path/to/the/socket")?;
+///
+///     // accept connections and process them, spawning a new thread for each one
+///     for stream in listener.incoming() {
+///         match stream {
+///             Ok(stream) => {
+///                 /* connection succeeded */
+///                 thread::spawn(|| handle_client(stream));
+///             }
+///             Err(err) => {
+///                 /* connection failed */
+///                 break;
+///             }
+///         }
+///     }
+///     Ok(())
+/// }
+/// ```
+#[stable(feature = "unix_socket", since = "1.10.0")]
+pub struct UnixListener(Socket);
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl fmt::Debug for UnixListener {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let mut builder = fmt.debug_struct("UnixListener");
+        builder.field("fd", self.0.as_inner());
+        if let Ok(addr) = self.local_addr() {
+            builder.field("local", &addr);
+        }
+        builder.finish()
+    }
+}
+
+impl UnixListener {
+    /// Creates a new `UnixListener` bound to the specified socket.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixListener;
+    ///
+    /// let listener = match UnixListener::bind("/path/to/the/socket") {
+    ///     Ok(sock) => sock,
+    ///     Err(e) => {
+    ///         println!("Couldn't connect: {:?}", e);
+    ///         return
+    ///     }
+    /// };
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn bind<P: AsRef<Path>>(path: P) -> io::Result<UnixListener> {
+        unsafe {
+            let inner = Socket::new_raw(libc::AF_UNIX, libc::SOCK_STREAM)?;
+            let (addr, len) = sockaddr_un(path.as_ref())?;
+
+            cvt(libc::bind(*inner.as_inner(), &addr as *const _ as *const _, len as _))?;
+            cvt(libc::listen(*inner.as_inner(), 128))?;
+
+            Ok(UnixListener(inner))
+        }
+    }
+
+    /// Accepts a new incoming connection to this listener.
+    ///
+    /// This function will block the calling thread until a new Unix connection
+    /// is established. When established, the corresponding [`UnixStream`] and
+    /// the remote peer's address will be returned.
+    ///
+    /// [`UnixStream`]: crate::os::unix::net::UnixStream
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixListener;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let listener = UnixListener::bind("/path/to/the/socket")?;
+    ///
+    ///     match listener.accept() {
+    ///         Ok((socket, addr)) => println!("Got a client: {:?}", addr),
+    ///         Err(e) => println!("accept function failed: {:?}", e),
+    ///     }
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn accept(&self) -> io::Result<(UnixStream, SocketAddr)> {
+        let mut storage: libc::sockaddr_un = unsafe { mem::zeroed() };
+        let mut len = mem::size_of_val(&storage) as libc::socklen_t;
+        let sock = self.0.accept(&mut storage as *mut _ as *mut _, &mut len)?;
+        let addr = SocketAddr::from_parts(storage, len)?;
+        Ok((UnixStream(sock), addr))
+    }
+
+    /// Creates a new independently owned handle to the underlying socket.
+    ///
+    /// The returned `UnixListener` is a reference to the same socket that this
+    /// object references. Both handles can be used to accept incoming
+    /// connections and options set on one listener will affect the other.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixListener;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let listener = UnixListener::bind("/path/to/the/socket")?;
+    ///     let listener_copy = listener.try_clone().expect("try_clone failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn try_clone(&self) -> io::Result<UnixListener> {
+        self.0.duplicate().map(UnixListener)
+    }
+
+    /// Returns the local socket address of this listener.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixListener;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let listener = UnixListener::bind("/path/to/the/socket")?;
+    ///     let addr = listener.local_addr().expect("Couldn't get local address");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn local_addr(&self) -> io::Result<SocketAddr> {
+        SocketAddr::new(|addr, len| unsafe { libc::getsockname(*self.0.as_inner(), addr, len) })
+    }
+
+    /// Moves the socket into or out of nonblocking mode.
+    ///
+    /// This will result in the `accept` operation becoming nonblocking,
+    /// i.e., immediately returning from their calls. If the IO operation is
+    /// successful, `Ok` is returned and no further action is required. If the
+    /// IO operation could not be completed and needs to be retried, an error
+    /// with kind [`io::ErrorKind::WouldBlock`] is returned.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixListener;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let listener = UnixListener::bind("/path/to/the/socket")?;
+    ///     listener.set_nonblocking(true).expect("Couldn't set non blocking");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
+        self.0.set_nonblocking(nonblocking)
+    }
+
+    /// Returns the value of the `SO_ERROR` option.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixListener;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let listener = UnixListener::bind("/tmp/sock")?;
+    ///
+    ///     if let Ok(Some(err)) = listener.take_error() {
+    ///         println!("Got error: {:?}", err);
+    ///     }
+    ///     Ok(())
+    /// }
+    /// ```
+    ///
+    /// # Platform specific
+    /// On Redox this always returns `None`.
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
+        self.0.take_error()
+    }
+
+    /// Returns an iterator over incoming connections.
+    ///
+    /// The iterator will never return [`None`] and will also not yield the
+    /// peer's [`SocketAddr`] structure.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::thread;
+    /// use std::os::unix::net::{UnixStream, UnixListener};
+    ///
+    /// fn handle_client(stream: UnixStream) {
+    ///     // ...
+    /// }
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let listener = UnixListener::bind("/path/to/the/socket")?;
+    ///
+    ///     for stream in listener.incoming() {
+    ///         match stream {
+    ///             Ok(stream) => {
+    ///                 thread::spawn(|| handle_client(stream));
+    ///             }
+    ///             Err(err) => {
+    ///                 break;
+    ///             }
+    ///         }
+    ///     }
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn incoming(&self) -> Incoming<'_> {
+        Incoming { listener: self }
+    }
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl AsRawFd for UnixListener {
+    fn as_raw_fd(&self) -> RawFd {
+        *self.0.as_inner()
+    }
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl FromRawFd for UnixListener {
+    unsafe fn from_raw_fd(fd: RawFd) -> UnixListener {
+        UnixListener(Socket::from_inner(fd))
+    }
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl IntoRawFd for UnixListener {
+    fn into_raw_fd(self) -> RawFd {
+        self.0.into_inner()
+    }
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl<'a> IntoIterator for &'a UnixListener {
+    type Item = io::Result<UnixStream>;
+    type IntoIter = Incoming<'a>;
+
+    fn into_iter(self) -> Incoming<'a> {
+        self.incoming()
+    }
+}
+
+/// An iterator over incoming connections to a [`UnixListener`].
+///
+/// It will never return [`None`].
+///
+/// # Examples
+///
+/// ```no_run
+/// use std::thread;
+/// use std::os::unix::net::{UnixStream, UnixListener};
+///
+/// fn handle_client(stream: UnixStream) {
+///     // ...
+/// }
+///
+/// fn main() -> std::io::Result<()> {
+///     let listener = UnixListener::bind("/path/to/the/socket")?;
+///
+///     for stream in listener.incoming() {
+///         match stream {
+///             Ok(stream) => {
+///                 thread::spawn(|| handle_client(stream));
+///             }
+///             Err(err) => {
+///                 break;
+///             }
+///         }
+///     }
+///     Ok(())
+/// }
+/// ```
+#[derive(Debug)]
+#[stable(feature = "unix_socket", since = "1.10.0")]
+pub struct Incoming<'a> {
+    listener: &'a UnixListener,
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl<'a> Iterator for Incoming<'a> {
+    type Item = io::Result<UnixStream>;
+
+    fn next(&mut self) -> Option<io::Result<UnixStream>> {
+        Some(self.listener.accept().map(|s| s.0))
+    }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        (usize::MAX, None)
+    }
+}
diff --git a/library/std/src/sys/unix/ext/net/mod.rs b/library/std/src/sys/unix/ext/net/mod.rs
new file mode 100644
index 00000000000..3088ffb5e5c
--- /dev/null
+++ b/library/std/src/sys/unix/ext/net/mod.rs
@@ -0,0 +1,54 @@
+//! Unix-specific networking functionality
+
+#![stable(feature = "unix_socket", since = "1.10.0")]
+
+mod addr;
+#[doc(cfg(any(
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "freebsd",
+    target_os = "linux",
+    target_os = "netbsd",
+    target_os = "openbsd",
+)))]
+#[cfg(any(
+    doc,
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "freebsd",
+    target_os = "linux",
+    target_os = "netbsd",
+    target_os = "openbsd",
+))]
+mod ancillary;
+mod datagram;
+mod listener;
+mod raw_fd;
+mod stream;
+#[cfg(all(test, not(target_os = "emscripten")))]
+mod tests;
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+pub use self::addr::*;
+#[cfg(any(
+    doc,
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "freebsd",
+    target_os = "linux",
+    target_os = "netbsd",
+    target_os = "openbsd",
+))]
+#[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+pub use self::ancillary::*;
+#[stable(feature = "unix_socket", since = "1.10.0")]
+pub use self::datagram::*;
+#[stable(feature = "unix_socket", since = "1.10.0")]
+pub use self::listener::*;
+#[stable(feature = "rust1", since = "1.0.0")]
+pub use self::raw_fd::*;
+#[stable(feature = "unix_socket", since = "1.10.0")]
+pub use self::stream::*;
diff --git a/library/std/src/sys/unix/ext/net/raw_fd.rs b/library/std/src/sys/unix/ext/net/raw_fd.rs
new file mode 100644
index 00000000000..c42fee4c73b
--- /dev/null
+++ b/library/std/src/sys/unix/ext/net/raw_fd.rs
@@ -0,0 +1,40 @@
+use crate::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+use crate::sys_common::{self, AsInner, FromInner, IntoInner};
+use crate::{net, sys};
+
+macro_rules! impl_as_raw_fd {
+    ($($t:ident)*) => {$(
+        #[stable(feature = "rust1", since = "1.0.0")]
+        impl AsRawFd for net::$t {
+            fn as_raw_fd(&self) -> RawFd {
+                *self.as_inner().socket().as_inner()
+            }
+        }
+    )*};
+}
+impl_as_raw_fd! { TcpStream TcpListener UdpSocket }
+
+macro_rules! impl_from_raw_fd {
+    ($($t:ident)*) => {$(
+        #[stable(feature = "from_raw_os", since = "1.1.0")]
+        impl FromRawFd for net::$t {
+            unsafe fn from_raw_fd(fd: RawFd) -> net::$t {
+                let socket = sys::net::Socket::from_inner(fd);
+                net::$t::from_inner(sys_common::net::$t::from_inner(socket))
+            }
+        }
+    )*};
+}
+impl_from_raw_fd! { TcpStream TcpListener UdpSocket }
+
+macro_rules! impl_into_raw_fd {
+    ($($t:ident)*) => {$(
+        #[stable(feature = "into_raw_os", since = "1.4.0")]
+        impl IntoRawFd for net::$t {
+            fn into_raw_fd(self) -> RawFd {
+                self.into_inner().into_socket().into_inner()
+            }
+        }
+    )*};
+}
+impl_into_raw_fd! { TcpStream TcpListener UdpSocket }
diff --git a/library/std/src/sys/unix/ext/net/stream.rs b/library/std/src/sys/unix/ext/net/stream.rs
new file mode 100644
index 00000000000..9fe6b85837e
--- /dev/null
+++ b/library/std/src/sys/unix/ext/net/stream.rs
@@ -0,0 +1,673 @@
+#[cfg(any(
+    doc,
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "freebsd",
+    target_os = "linux",
+    target_os = "netbsd",
+    target_os = "openbsd",
+))]
+use super::{recv_vectored_with_ancillary_from, send_vectored_with_ancillary_to, SocketAncillary};
+use super::{sockaddr_un, SocketAddr};
+use crate::fmt;
+use crate::io::{self, Initializer, IoSlice, IoSliceMut};
+use crate::net::Shutdown;
+use crate::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+#[cfg(any(
+    target_os = "android",
+    target_os = "linux",
+    target_os = "dragonfly",
+    target_os = "freebsd",
+    target_os = "ios",
+    target_os = "macos",
+    target_os = "openbsd"
+))]
+use crate::os::unix::ucred;
+use crate::path::Path;
+use crate::sys::cvt;
+use crate::sys::net::Socket;
+use crate::sys_common::{AsInner, FromInner, IntoInner};
+use crate::time::Duration;
+
+#[unstable(feature = "peer_credentials_unix_socket", issue = "42839", reason = "unstable")]
+#[cfg(any(
+    target_os = "android",
+    target_os = "linux",
+    target_os = "dragonfly",
+    target_os = "freebsd",
+    target_os = "ios",
+    target_os = "macos",
+    target_os = "openbsd"
+))]
+pub use ucred::UCred;
+
+/// A Unix stream socket.
+///
+/// # Examples
+///
+/// ```no_run
+/// use std::os::unix::net::UnixStream;
+/// use std::io::prelude::*;
+///
+/// fn main() -> std::io::Result<()> {
+///     let mut stream = UnixStream::connect("/path/to/my/socket")?;
+///     stream.write_all(b"hello world")?;
+///     let mut response = String::new();
+///     stream.read_to_string(&mut response)?;
+///     println!("{}", response);
+///     Ok(())
+/// }
+/// ```
+#[stable(feature = "unix_socket", since = "1.10.0")]
+pub struct UnixStream(pub(super) Socket);
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl fmt::Debug for UnixStream {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let mut builder = fmt.debug_struct("UnixStream");
+        builder.field("fd", self.0.as_inner());
+        if let Ok(addr) = self.local_addr() {
+            builder.field("local", &addr);
+        }
+        if let Ok(addr) = self.peer_addr() {
+            builder.field("peer", &addr);
+        }
+        builder.finish()
+    }
+}
+
+impl UnixStream {
+    /// Connects to the socket named by `path`.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixStream;
+    ///
+    /// let socket = match UnixStream::connect("/tmp/sock") {
+    ///     Ok(sock) => sock,
+    ///     Err(e) => {
+    ///         println!("Couldn't connect: {:?}", e);
+    ///         return
+    ///     }
+    /// };
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn connect<P: AsRef<Path>>(path: P) -> io::Result<UnixStream> {
+        unsafe {
+            let inner = Socket::new_raw(libc::AF_UNIX, libc::SOCK_STREAM)?;
+            let (addr, len) = sockaddr_un(path.as_ref())?;
+
+            cvt(libc::connect(*inner.as_inner(), &addr as *const _ as *const _, len))?;
+            Ok(UnixStream(inner))
+        }
+    }
+
+    /// Creates an unnamed pair of connected sockets.
+    ///
+    /// Returns two `UnixStream`s which are connected to each other.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixStream;
+    ///
+    /// let (sock1, sock2) = match UnixStream::pair() {
+    ///     Ok((sock1, sock2)) => (sock1, sock2),
+    ///     Err(e) => {
+    ///         println!("Couldn't create a pair of sockets: {:?}", e);
+    ///         return
+    ///     }
+    /// };
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn pair() -> io::Result<(UnixStream, UnixStream)> {
+        let (i1, i2) = Socket::new_pair(libc::AF_UNIX, libc::SOCK_STREAM)?;
+        Ok((UnixStream(i1), UnixStream(i2)))
+    }
+
+    /// Creates a new independently owned handle to the underlying socket.
+    ///
+    /// The returned `UnixStream` is a reference to the same stream that this
+    /// object references. Both handles will read and write the same stream of
+    /// data, and options set on one stream will be propagated to the other
+    /// stream.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixStream;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     let sock_copy = socket.try_clone().expect("Couldn't clone socket");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn try_clone(&self) -> io::Result<UnixStream> {
+        self.0.duplicate().map(UnixStream)
+    }
+
+    /// Returns the socket address of the local half of this connection.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixStream;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     let addr = socket.local_addr().expect("Couldn't get local address");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn local_addr(&self) -> io::Result<SocketAddr> {
+        SocketAddr::new(|addr, len| unsafe { libc::getsockname(*self.0.as_inner(), addr, len) })
+    }
+
+    /// Returns the socket address of the remote half of this connection.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixStream;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     let addr = socket.peer_addr().expect("Couldn't get peer address");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn peer_addr(&self) -> io::Result<SocketAddr> {
+        SocketAddr::new(|addr, len| unsafe { libc::getpeername(*self.0.as_inner(), addr, len) })
+    }
+
+    /// Gets the peer credentials for this Unix domain socket.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// #![feature(peer_credentials_unix_socket)]
+    /// use std::os::unix::net::UnixStream;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     let peer_cred = socket.peer_cred().expect("Couldn't get peer credentials");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[unstable(feature = "peer_credentials_unix_socket", issue = "42839", reason = "unstable")]
+    #[cfg(any(
+        target_os = "android",
+        target_os = "linux",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "openbsd"
+    ))]
+    pub fn peer_cred(&self) -> io::Result<UCred> {
+        ucred::peer_cred(self)
+    }
+
+    /// Sets the read timeout for the socket.
+    ///
+    /// If the provided value is [`None`], then [`read`] calls will block
+    /// indefinitely. An [`Err`] is returned if the zero [`Duration`] is passed to this
+    /// method.
+    ///
+    /// [`read`]: io::Read::read
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixStream;
+    /// use std::time::Duration;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     socket.set_read_timeout(Some(Duration::new(1, 0))).expect("Couldn't set read timeout");
+    ///     Ok(())
+    /// }
+    /// ```
+    ///
+    /// An [`Err`] is returned if the zero [`Duration`] is passed to this
+    /// method:
+    ///
+    /// ```no_run
+    /// use std::io;
+    /// use std::os::unix::net::UnixStream;
+    /// use std::time::Duration;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     let result = socket.set_read_timeout(Some(Duration::new(0, 0)));
+    ///     let err = result.unwrap_err();
+    ///     assert_eq!(err.kind(), io::ErrorKind::InvalidInput);
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn set_read_timeout(&self, timeout: Option<Duration>) -> io::Result<()> {
+        self.0.set_timeout(timeout, libc::SO_RCVTIMEO)
+    }
+
+    /// Sets the write timeout for the socket.
+    ///
+    /// If the provided value is [`None`], then [`write`] calls will block
+    /// indefinitely. An [`Err`] is returned if the zero [`Duration`] is
+    /// passed to this method.
+    ///
+    /// [`read`]: io::Read::read
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixStream;
+    /// use std::time::Duration;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     socket.set_write_timeout(Some(Duration::new(1, 0)))
+    ///         .expect("Couldn't set write timeout");
+    ///     Ok(())
+    /// }
+    /// ```
+    ///
+    /// An [`Err`] is returned if the zero [`Duration`] is passed to this
+    /// method:
+    ///
+    /// ```no_run
+    /// use std::io;
+    /// use std::net::UdpSocket;
+    /// use std::time::Duration;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UdpSocket::bind("127.0.0.1:34254")?;
+    ///     let result = socket.set_write_timeout(Some(Duration::new(0, 0)));
+    ///     let err = result.unwrap_err();
+    ///     assert_eq!(err.kind(), io::ErrorKind::InvalidInput);
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn set_write_timeout(&self, timeout: Option<Duration>) -> io::Result<()> {
+        self.0.set_timeout(timeout, libc::SO_SNDTIMEO)
+    }
+
+    /// Returns the read timeout of this socket.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixStream;
+    /// use std::time::Duration;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     socket.set_read_timeout(Some(Duration::new(1, 0))).expect("Couldn't set read timeout");
+    ///     assert_eq!(socket.read_timeout()?, Some(Duration::new(1, 0)));
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn read_timeout(&self) -> io::Result<Option<Duration>> {
+        self.0.timeout(libc::SO_RCVTIMEO)
+    }
+
+    /// Returns the write timeout of this socket.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixStream;
+    /// use std::time::Duration;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     socket.set_write_timeout(Some(Duration::new(1, 0)))
+    ///         .expect("Couldn't set write timeout");
+    ///     assert_eq!(socket.write_timeout()?, Some(Duration::new(1, 0)));
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn write_timeout(&self) -> io::Result<Option<Duration>> {
+        self.0.timeout(libc::SO_SNDTIMEO)
+    }
+
+    /// Moves the socket into or out of nonblocking mode.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixStream;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     socket.set_nonblocking(true).expect("Couldn't set nonblocking");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
+        self.0.set_nonblocking(nonblocking)
+    }
+
+    /// Moves the socket to pass unix credentials as control message in [`SocketAncillary`].
+    ///
+    /// Set the socket option `SO_PASSCRED`.
+    ///
+    /// # Examples
+    ///
+    #[cfg_attr(any(target_os = "android", target_os = "linux"), doc = "```no_run")]
+    #[cfg_attr(not(any(target_os = "android", target_os = "linux")), doc = "```ignore")]
+    /// #![feature(unix_socket_ancillary_data)]
+    /// use std::os::unix::net::UnixStream;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     socket.set_passcred(true).expect("Couldn't set passcred");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[cfg(any(doc, target_os = "android", target_os = "linux",))]
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn set_passcred(&self, passcred: bool) -> io::Result<()> {
+        self.0.set_passcred(passcred)
+    }
+
+    /// Get the current value of the socket for passing unix credentials in [`SocketAncillary`].
+    /// This value can be change by [`set_passcred`].
+    ///
+    /// Get the socket option `SO_PASSCRED`.
+    ///
+    /// [`set_passcred`]: UnixStream::set_passcred
+    #[cfg(any(doc, target_os = "android", target_os = "linux",))]
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn passcred(&self) -> io::Result<bool> {
+        self.0.passcred()
+    }
+
+    /// Returns the value of the `SO_ERROR` option.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixStream;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     if let Ok(Some(err)) = socket.take_error() {
+    ///         println!("Got error: {:?}", err);
+    ///     }
+    ///     Ok(())
+    /// }
+    /// ```
+    ///
+    /// # Platform specific
+    /// On Redox this always returns `None`.
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
+        self.0.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`]).
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// use std::os::unix::net::UnixStream;
+    /// use std::net::Shutdown;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     socket.shutdown(Shutdown::Both).expect("shutdown function failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[stable(feature = "unix_socket", since = "1.10.0")]
+    pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
+        self.0.shutdown(how)
+    }
+
+    /// 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.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// #![feature(unix_socket_peek)]
+    ///
+    /// use std::os::unix::net::UnixStream;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     let mut buf = [0; 10];
+    ///     let len = socket.peek(&mut buf).expect("peek failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[unstable(feature = "unix_socket_peek", issue = "76923")]
+    pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
+        self.0.peek(buf)
+    }
+
+    /// Receives data and ancillary data from socket.
+    ///
+    /// On success, returns the number of bytes read.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// #![feature(unix_socket_ancillary_data)]
+    /// use std::os::unix::net::{UnixStream, SocketAncillary, AncillaryData};
+    /// use std::io::IoSliceMut;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     let mut buf1 = [1; 8];
+    ///     let mut buf2 = [2; 16];
+    ///     let mut buf3 = [3; 8];
+    ///     let mut bufs = &mut [
+    ///         IoSliceMut::new(&mut buf1),
+    ///         IoSliceMut::new(&mut buf2),
+    ///         IoSliceMut::new(&mut buf3),
+    ///     ][..];
+    ///     let mut fds = [0; 8];
+    ///     let mut ancillary_buffer = [0; 128];
+    ///     let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
+    ///     let size = socket.recv_vectored_with_ancillary(bufs, &mut ancillary)?;
+    ///     println!("received {}", size);
+    ///     for ancillary_result in ancillary.messages() {
+    ///         if let AncillaryData::ScmRights(scm_rights) = ancillary_result.unwrap() {
+    ///             for fd in scm_rights {
+    ///                 println!("receive file descriptor: {}", fd);
+    ///             }
+    ///         }
+    ///     }
+    ///     Ok(())
+    /// }
+    /// ```
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "emscripten",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn recv_vectored_with_ancillary(
+        &self,
+        bufs: &mut [IoSliceMut<'_>],
+        ancillary: &mut SocketAncillary<'_>,
+    ) -> io::Result<usize> {
+        let (count, _, _) = recv_vectored_with_ancillary_from(&self.0, bufs, ancillary)?;
+
+        Ok(count)
+    }
+
+    /// Sends data and ancillary data on the socket.
+    ///
+    /// On success, returns the number of bytes written.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// #![feature(unix_socket_ancillary_data)]
+    /// use std::os::unix::net::{UnixStream, SocketAncillary};
+    /// use std::io::IoSliceMut;
+    ///
+    /// fn main() -> std::io::Result<()> {
+    ///     let socket = UnixStream::connect("/tmp/sock")?;
+    ///     let mut buf1 = [1; 8];
+    ///     let mut buf2 = [2; 16];
+    ///     let mut buf3 = [3; 8];
+    ///     let mut bufs = &mut [
+    ///         IoSliceMut::new(&mut buf1),
+    ///         IoSliceMut::new(&mut buf2),
+    ///         IoSliceMut::new(&mut buf3),
+    ///     ][..];
+    ///     let fds = [0, 1, 2];
+    ///     let mut ancillary_buffer = [0; 128];
+    ///     let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
+    ///     ancillary.add_fds(&fds[..]);
+    ///     socket.send_vectored_with_ancillary(bufs, &mut ancillary).expect("send_vectored_with_ancillary function failed");
+    ///     Ok(())
+    /// }
+    /// ```
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "emscripten",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn send_vectored_with_ancillary(
+        &self,
+        bufs: &mut [IoSliceMut<'_>],
+        ancillary: &mut SocketAncillary<'_>,
+    ) -> io::Result<usize> {
+        send_vectored_with_ancillary_to(&self.0, None, bufs, ancillary)
+    }
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl io::Read for UnixStream {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        io::Read::read(&mut &*self, buf)
+    }
+
+    fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
+        io::Read::read_vectored(&mut &*self, bufs)
+    }
+
+    #[inline]
+    fn is_read_vectored(&self) -> bool {
+        io::Read::is_read_vectored(&&*self)
+    }
+
+    #[inline]
+    unsafe fn initializer(&self) -> Initializer {
+        Initializer::nop()
+    }
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl<'a> io::Read for &'a UnixStream {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        self.0.read(buf)
+    }
+
+    fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
+        self.0.read_vectored(bufs)
+    }
+
+    #[inline]
+    fn is_read_vectored(&self) -> bool {
+        self.0.is_read_vectored()
+    }
+
+    #[inline]
+    unsafe fn initializer(&self) -> Initializer {
+        Initializer::nop()
+    }
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl io::Write for UnixStream {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        io::Write::write(&mut &*self, buf)
+    }
+
+    fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
+        io::Write::write_vectored(&mut &*self, bufs)
+    }
+
+    #[inline]
+    fn is_write_vectored(&self) -> bool {
+        io::Write::is_write_vectored(&&*self)
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        io::Write::flush(&mut &*self)
+    }
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl<'a> io::Write for &'a UnixStream {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        self.0.write(buf)
+    }
+
+    fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
+        self.0.write_vectored(bufs)
+    }
+
+    #[inline]
+    fn is_write_vectored(&self) -> bool {
+        self.0.is_write_vectored()
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl AsRawFd for UnixStream {
+    fn as_raw_fd(&self) -> RawFd {
+        *self.0.as_inner()
+    }
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl FromRawFd for UnixStream {
+    unsafe fn from_raw_fd(fd: RawFd) -> UnixStream {
+        UnixStream(Socket::from_inner(fd))
+    }
+}
+
+#[stable(feature = "unix_socket", since = "1.10.0")]
+impl IntoRawFd for UnixStream {
+    fn into_raw_fd(self) -> RawFd {
+        self.0.into_inner()
+    }
+}
diff --git a/library/std/src/sys/unix/ext/net/tests.rs b/library/std/src/sys/unix/ext/net/tests.rs
index ee73a6ed538..97a016904b4 100644
--- a/library/std/src/sys/unix/ext/net/tests.rs
+++ b/library/std/src/sys/unix/ext/net/tests.rs
@@ -1,11 +1,30 @@
+use super::*;
 use crate::io::prelude::*;
-use crate::io::{self, ErrorKind};
+use crate::io::{self, ErrorKind, IoSlice, IoSliceMut};
+#[cfg(any(
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "freebsd",
+    target_os = "linux",
+    target_os = "netbsd",
+    target_os = "openbsd",
+))]
+use crate::iter::FromIterator;
+#[cfg(any(
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "freebsd",
+    target_os = "linux",
+    target_os = "netbsd",
+    target_os = "openbsd",
+))]
+use crate::os::unix::io::AsRawFd;
 use crate::sys_common::io::test::tmpdir;
 use crate::thread;
 use crate::time::Duration;
 
-use super::*;
-
 macro_rules! or_panic {
     ($e:expr) => {
         match $e {
@@ -452,3 +471,170 @@ fn test_unix_datagram_peek_from() {
     assert_eq!(size, 11);
     assert_eq!(msg, &buf[..]);
 }
+
+#[cfg(any(
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "freebsd",
+    target_os = "linux",
+    target_os = "netbsd",
+    target_os = "openbsd",
+))]
+#[test]
+fn test_send_vectored_fds_unix_stream() {
+    let (s1, s2) = or_panic!(UnixStream::pair());
+
+    let mut buf1 = [1; 8];
+    let mut bufs_send = &mut [IoSliceMut::new(&mut buf1[..])][..];
+
+    let mut ancillary1_buffer = [0; 128];
+    let mut ancillary1 = SocketAncillary::new(&mut ancillary1_buffer[..]);
+    assert!(ancillary1.add_fds(&[s1.as_raw_fd()][..]));
+
+    let usize = or_panic!(s1.send_vectored_with_ancillary(&mut bufs_send, &mut ancillary1));
+    assert_eq!(usize, 8);
+
+    let mut buf2 = [0; 8];
+    let mut bufs_recv = &mut [IoSliceMut::new(&mut buf2[..])][..];
+
+    let mut ancillary2_buffer = [0; 128];
+    let mut ancillary2 = SocketAncillary::new(&mut ancillary2_buffer[..]);
+
+    let usize = or_panic!(s2.recv_vectored_with_ancillary(&mut bufs_recv, &mut ancillary2));
+    assert_eq!(usize, 8);
+    assert_eq!(buf1, buf2);
+
+    let mut ancillary_data_vec = Vec::from_iter(ancillary2.messages());
+    assert_eq!(ancillary_data_vec.len(), 1);
+    if let AncillaryData::ScmRights(scm_rights) = ancillary_data_vec.pop().unwrap().unwrap() {
+        let fd_vec = Vec::from_iter(scm_rights);
+        assert_eq!(fd_vec.len(), 1);
+        unsafe {
+            libc::close(fd_vec[0]);
+        }
+    } else {
+        unreachable!("must be ScmRights");
+    }
+}
+
+#[cfg(any(target_os = "android", target_os = "emscripten", target_os = "linux",))]
+#[test]
+fn test_send_vectored_with_ancillary_to_unix_datagram() {
+    fn getpid() -> libc::pid_t {
+        unsafe { libc::getpid() }
+    }
+
+    fn getuid() -> libc::uid_t {
+        unsafe { libc::getuid() }
+    }
+
+    fn getgid() -> libc::gid_t {
+        unsafe { libc::getgid() }
+    }
+
+    let dir = tmpdir();
+    let path1 = dir.path().join("sock1");
+    let path2 = dir.path().join("sock2");
+
+    let bsock1 = or_panic!(UnixDatagram::bind(&path1));
+    let bsock2 = or_panic!(UnixDatagram::bind(&path2));
+
+    or_panic!(bsock2.set_passcred(true));
+
+    let mut buf1 = [1; 8];
+    let mut bufs_send = &mut [IoSliceMut::new(&mut buf1[..])][..];
+
+    let mut ancillary1_buffer = [0; 128];
+    let mut ancillary1 = SocketAncillary::new(&mut ancillary1_buffer[..]);
+    let mut cred1 = SocketCred::new();
+    cred1.set_pid(getpid());
+    cred1.set_uid(getuid());
+    cred1.set_gid(getgid());
+    assert!(ancillary1.add_creds(&[cred1.clone()][..]));
+
+    let usize =
+        or_panic!(bsock1.send_vectored_with_ancillary_to(&mut bufs_send, &mut ancillary1, &path2));
+    assert_eq!(usize, 8);
+
+    let mut buf2 = [0; 8];
+    let mut bufs_recv = &mut [IoSliceMut::new(&mut buf2[..])][..];
+
+    let mut ancillary2_buffer = [0; 128];
+    let mut ancillary2 = SocketAncillary::new(&mut ancillary2_buffer[..]);
+
+    let (usize, truncated, _addr) =
+        or_panic!(bsock2.recv_vectored_with_ancillary_from(&mut bufs_recv, &mut ancillary2));
+    assert_eq!(ancillary2.truncated(), false);
+    assert_eq!(usize, 8);
+    assert_eq!(truncated, false);
+    assert_eq!(buf1, buf2);
+
+    let mut ancillary_data_vec = Vec::from_iter(ancillary2.messages());
+    assert_eq!(ancillary_data_vec.len(), 1);
+    if let AncillaryData::ScmCredentials(scm_credentials) =
+        ancillary_data_vec.pop().unwrap().unwrap()
+    {
+        let cred_vec = Vec::from_iter(scm_credentials);
+        assert_eq!(cred_vec.len(), 1);
+        assert_eq!(cred1.get_pid(), cred_vec[0].get_pid());
+        assert_eq!(cred1.get_uid(), cred_vec[0].get_uid());
+        assert_eq!(cred1.get_gid(), cred_vec[0].get_gid());
+    } else {
+        unreachable!("must be ScmCredentials");
+    }
+}
+
+#[cfg(any(
+    target_os = "android",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "freebsd",
+    target_os = "linux",
+    target_os = "netbsd",
+    target_os = "openbsd",
+))]
+#[test]
+fn test_send_vectored_with_ancillary_unix_datagram() {
+    let dir = tmpdir();
+    let path1 = dir.path().join("sock1");
+    let path2 = dir.path().join("sock2");
+
+    let bsock1 = or_panic!(UnixDatagram::bind(&path1));
+    let bsock2 = or_panic!(UnixDatagram::bind(&path2));
+
+    let mut buf1 = [1; 8];
+    let mut bufs_send = &mut [IoSliceMut::new(&mut buf1[..])][..];
+
+    let mut ancillary1_buffer = [0; 128];
+    let mut ancillary1 = SocketAncillary::new(&mut ancillary1_buffer[..]);
+    assert!(ancillary1.add_fds(&[bsock1.as_raw_fd()][..]));
+
+    or_panic!(bsock1.connect(&path2));
+    let usize = or_panic!(bsock1.send_vectored_with_ancillary(&mut bufs_send, &mut ancillary1));
+    assert_eq!(usize, 8);
+
+    let mut buf2 = [0; 8];
+    let mut bufs_recv = &mut [IoSliceMut::new(&mut buf2[..])][..];
+
+    let mut ancillary2_buffer = [0; 128];
+    let mut ancillary2 = SocketAncillary::new(&mut ancillary2_buffer[..]);
+
+    let (usize, truncated) =
+        or_panic!(bsock2.recv_vectored_with_ancillary(&mut bufs_recv, &mut ancillary2));
+    assert_eq!(usize, 8);
+    assert_eq!(truncated, false);
+    assert_eq!(buf1, buf2);
+
+    let mut ancillary_data_vec = Vec::from_iter(ancillary2.messages());
+    assert_eq!(ancillary_data_vec.len(), 1);
+    if let AncillaryData::ScmRights(scm_rights) = ancillary_data_vec.pop().unwrap().unwrap() {
+        let fd_vec = Vec::from_iter(scm_rights);
+        assert_eq!(fd_vec.len(), 1);
+        unsafe {
+            libc::close(fd_vec[0]);
+        }
+    } else {
+        unreachable!("must be ScmRights");
+    }
+}
diff --git a/library/std/src/sys/unix/net.rs b/library/std/src/sys/unix/net.rs
index 378d690f8bf..7198a2f08d6 100644
--- a/library/std/src/sys/unix/net.rs
+++ b/library/std/src/sys/unix/net.rs
@@ -275,6 +275,20 @@ impl Socket {
         self.recv_from_with_flags(buf, 0)
     }
 
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "emscripten",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    pub fn recv_msg(&self, msg: &mut libc::msghdr) -> io::Result<usize> {
+        let n = cvt(unsafe { libc::recvmsg(self.0.raw(), msg, libc::MSG_CMSG_CLOEXEC) })?;
+        Ok(n as usize)
+    }
+
     pub fn peek_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
         self.recv_from_with_flags(buf, MSG_PEEK)
     }
@@ -292,6 +306,20 @@ impl Socket {
         self.0.is_write_vectored()
     }
 
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "emscripten",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
+    pub fn send_msg(&self, msg: &mut libc::msghdr) -> io::Result<usize> {
+        let n = cvt(unsafe { libc::sendmsg(self.0.raw(), msg, 0) })?;
+        Ok(n as usize)
+    }
+
     pub fn set_timeout(&self, dur: Option<Duration>, kind: libc::c_int) -> io::Result<()> {
         let timeout = match dur {
             Some(dur) => {
@@ -351,6 +379,17 @@ impl Socket {
         Ok(raw != 0)
     }
 
+    #[cfg(any(target_os = "android", target_os = "linux",))]
+    pub fn set_passcred(&self, passcred: bool) -> io::Result<()> {
+        setsockopt(self, libc::SOL_SOCKET, libc::SO_PASSCRED, passcred as libc::c_int)
+    }
+
+    #[cfg(any(target_os = "android", target_os = "linux",))]
+    pub fn passcred(&self) -> io::Result<bool> {
+        let passcred: libc::c_int = getsockopt(self, libc::SOL_SOCKET, libc::SO_PASSCRED)?;
+        Ok(passcred != 0)
+    }
+
     #[cfg(not(any(target_os = "solaris", target_os = "illumos")))]
     pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
         let mut nonblocking = nonblocking as libc::c_int;