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.

1 files changed, 0 insertions, 1768 deletions

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()
-    }
-}