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    // Copyright 2016 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    #![stable(feature = "unix_socket", since = "1.10.0")]

    //! Unix-specific networking functionality

    #[cfg(unix)]
    use libc;

    // FIXME(#43348): Make libc adapt #[doc(cfg(...))] so we don't need these fake definitions here?
    #[cfg(not(unix))]
    mod libc {
        pub use libc::c_int;
        pub type socklen_t = u32;
        pub struct sockaddr;
        #[derive(Clone)]
        pub struct sockaddr_un;
    }

    use ascii;
    use ffi::OsStr;
    use fmt;
    use io::{self, Initializer};
    use mem;
    use net::{self, Shutdown};
    use os::unix::ffi::OsStrExt;
    use os::unix::io::{RawFd, AsRawFd, FromRawFd, IntoRawFd};
    use path::Path;
    use time::Duration;
    use sys::{self, cvt};
    use sys::net::Socket;
    use sys_common::{self, AsInner, FromInner, IntoInner};

    #[cfg(any(target_os = "linux", target_os = "android",
              target_os = "dragonfly", target_os = "freebsd",
              target_os = "openbsd", target_os = "netbsd",
              target_os = "haiku", target_os = "bitrig"))]
    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", target_os = "bitrig")))]
    const MSG_NOSIGNAL: libc::c_int = 0x0;

    fn sun_path_offset() -> usize {
        // Work with an actual instance of the type since using a null pointer is UB
        let addr: libc::sockaddr_un = unsafe { mem::uninitialized() };
        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() + 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() 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 and only if the address is unnamed.
        ///
        /// # Examples
        ///
        /// A named address:
        ///
        /// ```no_run
        /// use std::os::unix::net::UnixListener;
        ///
        /// let socket = UnixListener::bind("/tmp/sock").unwrap();
        /// let addr = socket.local_addr().expect("Couldn't get local address");
        /// assert_eq!(addr.is_unnamed(), false);
        /// ```
        ///
        /// An unnamed address:
        ///
        /// ```
        /// use std::os::unix::net::UnixDatagram;
        ///
        /// let socket = UnixDatagram::unbound().unwrap();
        /// let addr = socket.local_addr().expect("Couldn't get local address");
        /// assert_eq!(addr.is_unnamed(), true);
        /// ```
        #[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;
        ///
        /// let socket = UnixListener::bind("/tmp/sock").unwrap();
        /// let addr = socket.local_addr().expect("Couldn't get local address");
        /// assert_eq!(addr.as_pathname(), Some(Path::new("/tmp/sock")));
        /// ```
        ///
        /// Without a pathname:
        ///
        /// ```
        /// use std::os::unix::net::UnixDatagram;
        ///
        /// let socket = UnixDatagram::unbound().unwrap();
        /// let addr = socket.local_addr().expect("Couldn't get local address");
        /// assert_eq!(addr.as_pathname(), None);
        /// ```
        #[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<'a>(&'a self) -> AddressKind<'a> {
            let len = self.len as usize - sun_path_offset();
            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::*;
    ///
    /// let mut stream = UnixStream::connect("/path/to/my/socket").unwrap();
    /// stream.write_all(b"hello world").unwrap();
    /// let mut response = String::new();
    /// stream.read_to_string(&mut response).unwrap();
    /// println!("{}", response);
    /// ```
    #[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;
        ///
        /// let socket = UnixStream::connect("/tmp/sock").unwrap();
        /// let sock_copy = socket.try_clone().expect("Couldn't clone socket");
        /// ```
        #[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;
        ///
        /// let socket = UnixStream::connect("/tmp/sock").unwrap();
        /// let addr = socket.local_addr().expect("Couldn't get local address");
        /// ```
        #[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;
        ///
        /// let socket = UnixStream::connect("/tmp/sock").unwrap();
        /// let addr = socket.peer_addr().expect("Couldn't get peer address");
        /// ```
        #[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) })
        }

        /// 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.
        ///
        /// [`None`]: ../../../../std/option/enum.Option.html#variant.None
        /// [`Err`]: ../../../../std/result/enum.Result.html#variant.Err
        /// [`read`]: ../../../../std/io/trait.Read.html#tymethod.read
        /// [`Duration`]: ../../../../std/time/struct.Duration.html
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::os::unix::net::UnixStream;
        /// use std::time::Duration;
        ///
        /// let socket = UnixStream::connect("/tmp/sock").unwrap();
        /// socket.set_read_timeout(Some(Duration::new(1, 0))).expect("Couldn't set read timeout");
        /// ```
        ///
        /// 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;
        ///
        /// let socket = UnixStream::connect("/tmp/sock").unwrap();
        /// let result = socket.set_read_timeout(Some(Duration::new(0, 0)));
        /// let err = result.unwrap_err();
        /// assert_eq!(err.kind(), io::ErrorKind::InvalidInput)
        /// ```
        #[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.
        ///
        /// [`None`]: ../../../../std/option/enum.Option.html#variant.None
        /// [`Err`]: ../../../../std/result/enum.Result.html#variant.Err
        /// [`write`]: ../../../../std/io/trait.Write.html#tymethod.write
        /// [`Duration`]: ../../../../std/time/struct.Duration.html
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::os::unix::net::UnixStream;
        /// use std::time::Duration;
        ///
        /// let socket = UnixStream::connect("/tmp/sock").unwrap();
        /// socket.set_write_timeout(Some(Duration::new(1, 0))).expect("Couldn't set write timeout");
        /// ```
        ///
        /// 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;
        ///
        /// let socket = UdpSocket::bind("127.0.0.1:34254").unwrap();
        /// let result = socket.set_write_timeout(Some(Duration::new(0, 0)));
        /// let err = result.unwrap_err();
        /// assert_eq!(err.kind(), io::ErrorKind::InvalidInput)
        /// ```
        #[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;
        ///
        /// let socket = UnixStream::connect("/tmp/sock").unwrap();
        /// socket.set_read_timeout(Some(Duration::new(1, 0))).expect("Couldn't set read timeout");
        /// assert_eq!(socket.read_timeout().unwrap(), Some(Duration::new(1, 0)));
        /// ```
        #[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;
        ///
        /// let socket = UnixStream::connect("/tmp/sock").unwrap();
        /// socket.set_write_timeout(Some(Duration::new(1, 0))).expect("Couldn't set write timeout");
        /// assert_eq!(socket.write_timeout().unwrap(), Some(Duration::new(1, 0)));
        /// ```
        #[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;
        ///
        /// let socket = UnixStream::connect("/tmp/sock").unwrap();
        /// socket.set_nonblocking(true).expect("Couldn't set nonblocking");
        /// ```
        #[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;
        ///
        /// let socket = UnixStream::connect("/tmp/sock").unwrap();
        /// if let Ok(Some(err)) = socket.take_error() {
        ///     println!("Got error: {:?}", err);
        /// }
        /// ```
        ///
        /// # 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`]).
        ///
        /// [`Shutdown`]: ../../../../std/net/enum.Shutdown.html
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::os::unix::net::UnixStream;
        /// use std::net::Shutdown;
        ///
        /// let socket = UnixStream::connect("/tmp/sock").unwrap();
        /// socket.shutdown(Shutdown::Both).expect("shutdown function failed");
        /// ```
        #[stable(feature = "unix_socket", since = "1.10.0")]
        pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
            self.0.shutdown(how)
        }
    }

    #[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)
        }

        #[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)
        }

        #[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 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 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) {
    ///     // ...
    /// }
    ///
    /// let listener = UnixListener::bind("/path/to/the/socket").unwrap();
    ///
    /// // 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;
    ///         }
    ///     }
    /// }
    /// ```
    #[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`]: ../../../../std/os/unix/net/struct.UnixStream.html
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::os::unix::net::UnixListener;
        ///
        /// let listener = UnixListener::bind("/path/to/the/socket").unwrap();
        ///
        /// match listener.accept() {
        ///     Ok((socket, addr)) => println!("Got a client: {:?}", addr),
        ///     Err(e) => println!("accept function failed: {:?}", e),
        /// }
        /// ```
        #[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;
        ///
        /// let listener = UnixListener::bind("/path/to/the/socket").unwrap();
        ///
        /// let listener_copy = listener.try_clone().expect("try_clone failed");
        /// ```
        #[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;
        ///
        /// let listener = UnixListener::bind("/path/to/the/socket").unwrap();
        ///
        /// let addr = listener.local_addr().expect("Couldn't get local address");
        /// ```
        #[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.
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::os::unix::net::UnixListener;
        ///
        /// let listener = UnixListener::bind("/path/to/the/socket").unwrap();
        ///
        /// listener.set_nonblocking(true).expect("Couldn't set non blocking");
        /// ```
        #[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;
        ///
        /// let listener = UnixListener::bind("/tmp/sock").unwrap();
        ///
        /// if let Ok(Some(err)) = listener.take_error() {
        ///     println!("Got error: {:?}", err);
        /// }
        /// ```
        ///
        /// # 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.
        ///
        /// [`None`]: ../../../../std/option/enum.Option.html#variant.None
        /// [`SocketAddr`]: struct.SocketAddr.html
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::thread;
        /// use std::os::unix::net::{UnixStream, UnixListener};
        ///
        /// fn handle_client(stream: UnixStream) {
        ///     // ...
        /// }
        ///
        /// let listener = UnixListener::bind("/path/to/the/socket").unwrap();
        ///
        /// for stream in listener.incoming() {
        ///     match stream {
        ///         Ok(stream) => {
        ///             thread::spawn(|| handle_client(stream));
        ///         }
        ///         Err(err) => {
        ///             break;
        ///         }
        ///     }
        /// }
        /// ```
        #[stable(feature = "unix_socket", since = "1.10.0")]
        pub fn incoming<'a>(&'a self) -> Incoming<'a> {
            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`].
    ///
    /// [`None`]: ../../../../std/option/enum.Option.html#variant.None
    /// [`UnixListener`]: struct.UnixListener.html
    ///
    /// # Examples
    ///
    /// ```no_run
    /// use std::thread;
    /// use std::os::unix::net::{UnixStream, UnixListener};
    ///
    /// fn handle_client(stream: UnixStream) {
    ///     // ...
    /// }
    ///
    /// let listener = UnixListener::bind("/path/to/the/socket").unwrap();
    ///
    /// for stream in listener.incoming() {
    ///     match stream {
    ///         Ok(stream) => {
    ///             thread::spawn(|| handle_client(stream));
    ///         }
    ///         Err(err) => {
    ///             break;
    ///         }
    ///     }
    /// }
    /// ```
    #[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_value(), None)
        }
    }

    /// A Unix datagram socket.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// use std::os::unix::net::UnixDatagram;
    ///
    /// let socket = UnixDatagram::bind("/path/to/my/socket").unwrap();
    /// socket.send_to(b"hello world", "/path/to/other/socket").unwrap();
    /// let mut buf = [0; 100];
    /// let (count, address) = socket.recv_from(&mut buf).unwrap();
    /// println!("socket {:?} sent {:?}", address, &buf[..count]);
    /// ```
    #[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))
        }

        /// Create 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`]: #method.send
        /// [`recv`]: #method.recv
        /// [`recv_from`]: #method.recv_from
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::os::unix::net::UnixDatagram;
        ///
        /// let sock = UnixDatagram::unbound().unwrap();
        /// match sock.connect("/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 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;
        ///
        /// let sock = UnixDatagram::bind("/path/to/the/socket").unwrap();
        ///
        /// let sock_copy = sock.try_clone().expect("try_clone failed");
        /// ```
        #[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;
        ///
        /// let sock = UnixDatagram::bind("/path/to/the/socket").unwrap();
        ///
        /// let addr = sock.local_addr().expect("Couldn't get local address");
        /// ```
        #[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`]: #method.connect
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::os::unix::net::UnixDatagram;
        ///
        /// let sock = UnixDatagram::unbound().unwrap();
        /// sock.connect("/path/to/the/socket").unwrap();
        ///
        /// let addr = sock.peer_addr().expect("Couldn't get peer address");
        /// ```
        #[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) })
        }

        /// 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;
        ///
        /// let sock = UnixDatagram::unbound().unwrap();
        /// let mut buf = vec![0; 10];
        /// match sock.recv_from(buf.as_mut_slice()) {
        ///     Ok((size, sender)) => println!("received {} bytes from {:?}", size, sender),
        ///     Err(e) => println!("recv_from function failed: {:?}", e),
        /// }
        /// ```
        #[stable(feature = "unix_socket", since = "1.10.0")]
        pub fn recv_from(&self, buf: &mut [u8]) -> 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(),
                                           0,
                                           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.
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::os::unix::net::UnixDatagram;
        ///
        /// let sock = UnixDatagram::bind("/path/to/the/socket").unwrap();
        /// let mut buf = vec![0; 10];
        /// sock.recv(buf.as_mut_slice()).expect("recv function failed");
        /// ```
        #[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;
        ///
        /// let sock = UnixDatagram::unbound().unwrap();
        /// sock.send_to(b"omelette au fromage", "/some/sock").expect("send_to function failed");
        /// ```
        #[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;
        ///
        /// let sock = UnixDatagram::unbound().unwrap();
        /// sock.connect("/some/sock").expect("Couldn't connect");
        /// sock.send(b"omelette au fromage").expect("send_to function failed");
        /// ```
        #[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.
        ///
        /// [`None`]: ../../../../std/option/enum.Option.html#variant.None
        /// [`Err`]: ../../../../std/result/enum.Result.html#variant.Err
        /// [`recv`]: #method.recv
        /// [`recv_from`]: #method.recv_from
        /// [`Duration`]: ../../../../std/time/struct.Duration.html
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::os::unix::net::UnixDatagram;
        /// use std::time::Duration;
        ///
        /// let sock = UnixDatagram::unbound().unwrap();
        /// sock.set_read_timeout(Some(Duration::new(1, 0))).expect("set_read_timeout function failed");
        /// ```
        ///
        /// 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;
        ///
        /// let socket = UnixDatagram::unbound().unwrap();
        /// let result = socket.set_read_timeout(Some(Duration::new(0, 0)));
        /// let err = result.unwrap_err();
        /// assert_eq!(err.kind(), io::ErrorKind::InvalidInput)
        /// ```
        #[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.
        ///
        /// [`None`]: ../../../../std/option/enum.Option.html#variant.None
        /// [`send`]: #method.send
        /// [`send_to`]: #method.send_to
        /// [`Duration`]: ../../../../std/time/struct.Duration.html
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::os::unix::net::UnixDatagram;
        /// use std::time::Duration;
        ///
        /// let sock = UnixDatagram::unbound().unwrap();
        /// sock.set_write_timeout(Some(Duration::new(1, 0)))
        ///     .expect("set_write_timeout function failed");
        /// ```
        ///
        /// 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;
        ///
        /// let socket = UnixDatagram::unbound().unwrap();
        /// let result = socket.set_write_timeout(Some(Duration::new(0, 0)));
        /// let err = result.unwrap_err();
        /// assert_eq!(err.kind(), io::ErrorKind::InvalidInput)
        /// ```
        #[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::UnixDatagram;
        /// use std::time::Duration;
        ///
        /// let sock = UnixDatagram::unbound().unwrap();
        /// sock.set_read_timeout(Some(Duration::new(1, 0))).expect("set_read_timeout function failed");
        /// assert_eq!(sock.read_timeout().unwrap(), Some(Duration::new(1, 0)));
        /// ```
        #[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::UnixDatagram;
        /// use std::time::Duration;
        ///
        /// let sock = UnixDatagram::unbound().unwrap();
        /// sock.set_write_timeout(Some(Duration::new(1, 0)))
        ///     .expect("set_write_timeout function failed");
        /// assert_eq!(sock.write_timeout().unwrap(), Some(Duration::new(1, 0)));
        /// ```
        #[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;
        ///
        /// let sock = UnixDatagram::unbound().unwrap();
        /// sock.set_nonblocking(true).expect("set_nonblocking function failed");
        /// ```
        #[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;
        ///
        /// let sock = UnixDatagram::unbound().unwrap();
        /// if let Ok(Some(err)) = sock.take_error() {
        ///     println!("Got error: {:?}", err);
        /// }
        /// ```
        #[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`]).
        ///
        /// [`Shutdown`]: ../../../../std/net/enum.Shutdown.html
        ///
        /// ```no_run
        /// use std::os::unix::net::UnixDatagram;
        /// use std::net::Shutdown;
        ///
        /// let sock = UnixDatagram::unbound().unwrap();
        /// sock.shutdown(Shutdown::Both).expect("shutdown function failed");
        /// ```
        #[stable(feature = "unix_socket", since = "1.10.0")]
        pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
            self.0.shutdown(how)
        }
    }

    #[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()
        }
    }

    #[cfg(all(test, not(target_os = "emscripten")))]
    mod test {
        use thread;
        use io::{self, ErrorKind};
        use io::prelude::*;
        //use time::Duration;
        use sys_common::io::test::tmpdir;

        use super::*;

        macro_rules! or_panic {
            ($e:expr) => {
                match $e {
                    Ok(e) => e,
                    Err(e) => panic!("{}", e),
                }
            }
        }

        #[test]
        #[cfg(not(target_os = "openbsd"))]
        fn basic() {
            let dir = tmpdir();
            let socket_path = dir.path().join("sock");
            let msg1 = b"hello";
            let msg2 = b"world!";

            let listener = or_panic!(UnixListener::bind(&socket_path));
            let thread = thread::spawn(move || {
                let mut stream = or_panic!(listener.accept()).0;
                let mut buf = [0; 5];
                or_panic!(stream.read(&mut buf));
                assert_eq!(&msg1[..], &buf[..]);
                or_panic!(stream.write_all(msg2));
            });

            let mut stream = or_panic!(UnixStream::connect(&socket_path));
            assert_eq!(Some(&*socket_path),
                       stream.peer_addr().unwrap().as_pathname());
            or_panic!(stream.write_all(msg1));
            let mut buf = vec![];
            or_panic!(stream.read_to_end(&mut buf));
            assert_eq!(&msg2[..], &buf[..]);
            drop(stream);

            thread.join().unwrap();
        }

        #[test]
        fn pair() {
            let msg1 = b"hello";
            let msg2 = b"world!";

            let (mut s1, mut s2) = or_panic!(UnixStream::pair());
            let thread = thread::spawn(move || {
                // s1 must be moved in or the test will hang!
                let mut buf = [0; 5];
                or_panic!(s1.read(&mut buf));
                assert_eq!(&msg1[..], &buf[..]);
                or_panic!(s1.write_all(msg2));
            });

            or_panic!(s2.write_all(msg1));
            let mut buf = vec![];
            or_panic!(s2.read_to_end(&mut buf));
            assert_eq!(&msg2[..], &buf[..]);
            drop(s2);

            thread.join().unwrap();
        }

        #[test]
        fn try_clone() {
            let dir = tmpdir();
            let socket_path = dir.path().join("sock");
            let msg1 = b"hello";
            let msg2 = b"world";

            let listener = or_panic!(UnixListener::bind(&socket_path));
            let thread = thread::spawn(move || {
                let mut stream = or_panic!(listener.accept()).0;
                or_panic!(stream.write_all(msg1));
                or_panic!(stream.write_all(msg2));
            });

            let mut stream = or_panic!(UnixStream::connect(&socket_path));
            let mut stream2 = or_panic!(stream.try_clone());

            let mut buf = [0; 5];
            or_panic!(stream.read(&mut buf));
            assert_eq!(&msg1[..], &buf[..]);
            or_panic!(stream2.read(&mut buf));
            assert_eq!(&msg2[..], &buf[..]);

            thread.join().unwrap();
        }

        #[test]
        fn iter() {
            let dir = tmpdir();
            let socket_path = dir.path().join("sock");

            let listener = or_panic!(UnixListener::bind(&socket_path));
            let thread = thread::spawn(move || {
                for stream in listener.incoming().take(2) {
                    let mut stream = or_panic!(stream);
                    let mut buf = [0];
                    or_panic!(stream.read(&mut buf));
                }
            });

            for _ in 0..2 {
                let mut stream = or_panic!(UnixStream::connect(&socket_path));
                or_panic!(stream.write_all(&[0]));
            }

            thread.join().unwrap();
        }

        #[test]
        fn long_path() {
            let dir = tmpdir();
            let socket_path = dir.path()
                                 .join("asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfa\
                                        sasdfasdfasdasdfasdfasdfadfasdfasdfasdfasdfasdf");
            match UnixStream::connect(&socket_path) {
                Err(ref e) if e.kind() == io::ErrorKind::InvalidInput => {}
                Err(e) => panic!("unexpected error {}", e),
                Ok(_) => panic!("unexpected success"),
            }

            match UnixListener::bind(&socket_path) {
                Err(ref e) if e.kind() == io::ErrorKind::InvalidInput => {}
                Err(e) => panic!("unexpected error {}", e),
                Ok(_) => panic!("unexpected success"),
            }

            match UnixDatagram::bind(&socket_path) {
                Err(ref e) if e.kind() == io::ErrorKind::InvalidInput => {}
                Err(e) => panic!("unexpected error {}", e),
                Ok(_) => panic!("unexpected success"),
            }
        }

        #[test]
        #[cfg(not(target_os = "openbsd"))]
        fn timeouts() {
            let dir = tmpdir();
            let socket_path = dir.path().join("sock");

            let _listener = or_panic!(UnixListener::bind(&socket_path));

            let stream = or_panic!(UnixStream::connect(&socket_path));
            let dur = Duration::new(15410, 0);

            assert_eq!(None, or_panic!(stream.read_timeout()));

            or_panic!(stream.set_read_timeout(Some(dur)));
            assert_eq!(Some(dur), or_panic!(stream.read_timeout()));

            assert_eq!(None, or_panic!(stream.write_timeout()));

            or_panic!(stream.set_write_timeout(Some(dur)));
            assert_eq!(Some(dur), or_panic!(stream.write_timeout()));

            or_panic!(stream.set_read_timeout(None));
            assert_eq!(None, or_panic!(stream.read_timeout()));

            or_panic!(stream.set_write_timeout(None));
            assert_eq!(None, or_panic!(stream.write_timeout()));
        }

        #[test]
        fn test_read_timeout() {
            let dir = tmpdir();
            let socket_path = dir.path().join("sock");

            let _listener = or_panic!(UnixListener::bind(&socket_path));

            let mut stream = or_panic!(UnixStream::connect(&socket_path));
            or_panic!(stream.set_read_timeout(Some(Duration::from_millis(1000))));

            let mut buf = [0; 10];
            let kind = stream.read(&mut buf).err().expect("expected error").kind();
            assert!(kind == io::ErrorKind::WouldBlock || kind == io::ErrorKind::TimedOut);
        }

        #[test]
        fn test_read_with_timeout() {
            let dir = tmpdir();
            let socket_path = dir.path().join("sock");

            let listener = or_panic!(UnixListener::bind(&socket_path));

            let mut stream = or_panic!(UnixStream::connect(&socket_path));
            or_panic!(stream.set_read_timeout(Some(Duration::from_millis(1000))));

            let mut other_end = or_panic!(listener.accept()).0;
            or_panic!(other_end.write_all(b"hello world"));

            let mut buf = [0; 11];
            or_panic!(stream.read(&mut buf));
            assert_eq!(b"hello world", &buf[..]);

            let kind = stream.read(&mut buf).err().expect("expected error").kind();
            assert!(kind == io::ErrorKind::WouldBlock || kind == io::ErrorKind::TimedOut);
        }

        // Ensure the `set_read_timeout` and `set_write_timeout` calls return errors
        // when passed zero Durations
        #[test]
        fn test_unix_stream_timeout_zero_duration() {
            let dir = tmpdir();
            let socket_path = dir.path().join("sock");

            let listener = or_panic!(UnixListener::bind(&socket_path));
            let stream = or_panic!(UnixStream::connect(&socket_path));

            let result = stream.set_write_timeout(Some(Duration::new(0, 0)));
            let err = result.unwrap_err();
            assert_eq!(err.kind(), ErrorKind::InvalidInput);

            let result = stream.set_read_timeout(Some(Duration::new(0, 0)));
            let err = result.unwrap_err();
            assert_eq!(err.kind(), ErrorKind::InvalidInput);

            drop(listener);
        }

        #[test]
        fn test_unix_datagram() {
            let dir = tmpdir();
            let path1 = dir.path().join("sock1");
            let path2 = dir.path().join("sock2");

            let sock1 = or_panic!(UnixDatagram::bind(&path1));
            let sock2 = or_panic!(UnixDatagram::bind(&path2));

            let msg = b"hello world";
            or_panic!(sock1.send_to(msg, &path2));
            let mut buf = [0; 11];
            or_panic!(sock2.recv_from(&mut buf));
            assert_eq!(msg, &buf[..]);
        }

        #[test]
        fn test_unnamed_unix_datagram() {
            let dir = tmpdir();
            let path1 = dir.path().join("sock1");

            let sock1 = or_panic!(UnixDatagram::bind(&path1));
            let sock2 = or_panic!(UnixDatagram::unbound());

            let msg = b"hello world";
            or_panic!(sock2.send_to(msg, &path1));
            let mut buf = [0; 11];
            let (usize, addr) = or_panic!(sock1.recv_from(&mut buf));
            assert_eq!(usize, 11);
            assert!(addr.is_unnamed());
            assert_eq!(msg, &buf[..]);
        }

        #[test]
        fn test_connect_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 sock = or_panic!(UnixDatagram::unbound());
            or_panic!(sock.connect(&path1));

            // Check send()
            let msg = b"hello there";
            or_panic!(sock.send(msg));
            let mut buf = [0; 11];
            let (usize, addr) = or_panic!(bsock1.recv_from(&mut buf));
            assert_eq!(usize, 11);
            assert!(addr.is_unnamed());
            assert_eq!(msg, &buf[..]);

            // Changing default socket works too
            or_panic!(sock.connect(&path2));
            or_panic!(sock.send(msg));
            or_panic!(bsock2.recv_from(&mut buf));
        }

        #[test]
        fn test_unix_datagram_recv() {
            let dir = tmpdir();
            let path1 = dir.path().join("sock1");

            let sock1 = or_panic!(UnixDatagram::bind(&path1));
            let sock2 = or_panic!(UnixDatagram::unbound());
            or_panic!(sock2.connect(&path1));

            let msg = b"hello world";
            or_panic!(sock2.send(msg));
            let mut buf = [0; 11];
            let size = or_panic!(sock1.recv(&mut buf));
            assert_eq!(size, 11);
            assert_eq!(msg, &buf[..]);
        }

        #[test]
        fn datagram_pair() {
            let msg1 = b"hello";
            let msg2 = b"world!";

            let (s1, s2) = or_panic!(UnixDatagram::pair());
            let thread = thread::spawn(move || {
                // s1 must be moved in or the test will hang!
                let mut buf = [0; 5];
                or_panic!(s1.recv(&mut buf));
                assert_eq!(&msg1[..], &buf[..]);
                or_panic!(s1.send(msg2));
            });

            or_panic!(s2.send(msg1));
            let mut buf = [0; 6];
            or_panic!(s2.recv(&mut buf));
            assert_eq!(&msg2[..], &buf[..]);
            drop(s2);

            thread.join().unwrap();
        }

        // Ensure the `set_read_timeout` and `set_write_timeout` calls return errors
        // when passed zero Durations
        #[test]
        fn test_unix_datagram_timeout_zero_duration() {
            let dir = tmpdir();
            let path = dir.path().join("sock");

            let datagram = or_panic!(UnixDatagram::bind(&path));

            let result = datagram.set_write_timeout(Some(Duration::new(0, 0)));
            let err = result.unwrap_err();
            assert_eq!(err.kind(), ErrorKind::InvalidInput);

            let result = datagram.set_read_timeout(Some(Duration::new(0, 0)));
            let err = result.unwrap_err();
            assert_eq!(err.kind(), ErrorKind::InvalidInput);
        }

        #[test]
        fn abstract_namespace_not_allowed() {
            assert!(UnixStream::connect("\0asdf").is_err());
        }
    }

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