tcp.rs.html -- source
Description: Source to the Rust file `/usr/obj/ports/rust-1.16.0/rustc-1.16.0-src/src/libstd/net/tcp.rs`.
Keywords: rust, rustlang, rust-lang

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    // Copyright 2015 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.

    use io::prelude::*;

    use fmt;
    use io;
    use net::{ToSocketAddrs, SocketAddr, Shutdown};
    use sys_common::net as net_imp;
    use sys_common::{AsInner, FromInner, IntoInner};
    use time::Duration;

    /// A structure which represents a TCP stream between a local socket and a
    /// remote socket.
    ///
    /// The socket will be closed when the value is dropped.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// use std::io::prelude::*;
    /// use std::net::TcpStream;
    ///
    /// {
    ///     let mut stream = TcpStream::connect("127.0.0.1:34254").unwrap();
    ///
    ///     // ignore the Result
    ///     let _ = stream.write(&[1]);
    ///     let _ = stream.read(&mut [0; 128]); // ignore here too
    /// } // the stream is closed here
    /// ```
    #[stable(feature = "rust1", since = "1.0.0")]
    pub struct TcpStream(net_imp::TcpStream);

    /// A structure representing a socket server.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// use std::net::{TcpListener, TcpStream};
    ///
    /// let listener = TcpListener::bind("127.0.0.1:80").unwrap();
    ///
    /// fn handle_client(stream: TcpStream) {
    ///     // ...
    /// }
    ///
    /// // accept connections and process them serially
    /// for stream in listener.incoming() {
    ///     match stream {
    ///         Ok(stream) => {
    ///             handle_client(stream);
    ///         }
    ///         Err(e) => { /* connection failed */ }
    ///     }
    /// }
    /// ```
    #[stable(feature = "rust1", since = "1.0.0")]
    pub struct TcpListener(net_imp::TcpListener);

    /// An infinite iterator over the connections from a `TcpListener`.
    ///
    /// This iterator will infinitely yield [`Some`] of the accepted connections. It
    /// is equivalent to calling `accept` in a loop.
    ///
    /// This `struct` is created by the [`incoming`] method on [`TcpListener`].
    ///
    /// [`Some`]: ../../std/option/enum.Option.html#variant.Some
    /// [`incoming`]: struct.TcpListener.html#method.incoming
    /// [`TcpListener`]: struct.TcpListener.html
    #[stable(feature = "rust1", since = "1.0.0")]
    #[derive(Debug)]
    pub struct Incoming<'a> { listener: &'a TcpListener }

    impl TcpStream {
        /// Opens a TCP connection to a remote host.
        ///
        /// `addr` is an address of the remote host. Anything which implements
        /// `ToSocketAddrs` trait can be supplied for the address; see this trait
        /// documentation for concrete examples.
        /// In case `ToSocketAddrs::to_socket_addrs()` returns more than one entry,
        /// then the first valid and reachable address is used.
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpStream;
        ///
        /// if let Ok(stream) = TcpStream::connect("127.0.0.1:8080") {
        ///     println!("Connected to the server!");
        /// } else {
        ///     println!("Couldn't connect to server...");
        /// }
        /// ```
        #[stable(feature = "rust1", since = "1.0.0")]
        pub fn connect<A: ToSocketAddrs>(addr: A) -> io::Result<TcpStream> {
            super::each_addr(addr, net_imp::TcpStream::connect).map(TcpStream)
        }

        /// Returns the socket address of the remote peer of this TCP connection.
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::{Ipv4Addr, SocketAddr, SocketAddrV4, TcpStream};
        ///
        /// let stream = TcpStream::connect("127.0.0.1:8080")
        ///                        .expect("Couldn't connect to the server...");
        /// assert_eq!(stream.peer_addr().unwrap(),
        ///            SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080)));
        /// ```
        #[stable(feature = "rust1", since = "1.0.0")]
        pub fn peer_addr(&self) -> io::Result<SocketAddr> {
            self.0.peer_addr()
        }

        /// Returns the socket address of the local half of this TCP connection.
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::{Ipv4Addr, SocketAddr, SocketAddrV4, TcpStream};
        ///
        /// let stream = TcpStream::connect("127.0.0.1:8080")
        ///                        .expect("Couldn't connect to the server...");
        /// assert_eq!(stream.local_addr().unwrap(),
        ///            SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080)));
        /// ```
        #[stable(feature = "rust1", since = "1.0.0")]
        pub fn local_addr(&self) -> io::Result<SocketAddr> {
            self.0.socket_addr()
        }

        /// Shuts down the read, write, or both halves of this connection.
        ///
        /// This function will cause all pending and future I/O on the specified
        /// portions to return immediately with an appropriate value (see the
        /// documentation of [`Shutdown`]).
        ///
        /// [`Shutdown`]: ../../std/net/enum.Shutdown.html
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::{Shutdown, TcpStream};
        ///
        /// let stream = TcpStream::connect("127.0.0.1:8080")
        ///                        .expect("Couldn't connect to the server...");
        /// stream.shutdown(Shutdown::Both).expect("shutdown call failed");
        /// ```
        #[stable(feature = "rust1", since = "1.0.0")]
        pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
            self.0.shutdown(how)
        }

        /// Creates a new independently owned handle to the underlying socket.
        ///
        /// The returned `TcpStream` 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::net::TcpStream;
        ///
        /// let stream = TcpStream::connect("127.0.0.1:8080")
        ///                        .expect("Couldn't connect to the server...");
        /// let stream_clone = stream.try_clone().expect("clone failed...");
        /// ```
        #[stable(feature = "rust1", since = "1.0.0")]
        pub fn try_clone(&self) -> io::Result<TcpStream> {
            self.0.duplicate().map(TcpStream)
        }

        /// Sets the read timeout to the timeout specified.
        ///
        /// If the value specified is [`None`], then [`read()`] calls will block
        /// indefinitely. It is an error to pass the zero `Duration` to this
        /// method.
        ///
        /// # Note
        ///
        /// Platforms may return a different error code whenever a read times out as
        /// a result of setting this option. For example Unix typically returns an
        /// error of the kind [`WouldBlock`], but Windows may return [`TimedOut`].
        ///
        /// [`None`]: ../../std/option/enum.Option.html#variant.None
        /// [`read()`]: ../../std/io/trait.Read.html#tymethod.read
        /// [`WouldBlock`]: ../../std/io/enum.ErrorKind.html#variant.WouldBlock
        /// [`TimedOut`]: ../../std/io/enum.ErrorKind.html#variant.TimedOut
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpStream;
        ///
        /// let stream = TcpStream::connect("127.0.0.1:8080")
        ///                        .expect("Couldn't connect to the server...");
        /// stream.set_read_timeout(None).expect("set_read_timeout call failed");
        /// ```
        #[stable(feature = "socket_timeout", since = "1.4.0")]
        pub fn set_read_timeout(&self, dur: Option<Duration>) -> io::Result<()> {
            self.0.set_read_timeout(dur)
        }

        /// Sets the write timeout to the timeout specified.
        ///
        /// If the value specified is [`None`], then [`write()`] calls will block
        /// indefinitely. It is an error to pass the zero [`Duration`] to this
        /// method.
        ///
        /// # Note
        ///
        /// Platforms may return a different error code whenever a write times out
        /// as a result of setting this option. For example Unix typically returns
        /// an error of the kind [`WouldBlock`], but Windows may return [`TimedOut`].
        ///
        /// [`None`]: ../../std/option/enum.Option.html#variant.None
        /// [`write()`]: ../../std/io/trait.Write.html#tymethod.write
        /// [`Duration`]: ../../std/time/struct.Duration.html
        /// [`WouldBlock`]: ../../std/io/enum.ErrorKind.html#variant.WouldBlock
        /// [`TimedOut`]: ../../std/io/enum.ErrorKind.html#variant.TimedOut
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpStream;
        ///
        /// let stream = TcpStream::connect("127.0.0.1:8080")
        ///                        .expect("Couldn't connect to the server...");
        /// stream.set_write_timeout(None).expect("set_write_timeout call failed");
        /// ```
        #[stable(feature = "socket_timeout", since = "1.4.0")]
        pub fn set_write_timeout(&self, dur: Option<Duration>) -> io::Result<()> {
            self.0.set_write_timeout(dur)
        }

        /// Returns the read timeout of this socket.
        ///
        /// If the timeout is [`None`], then [`read()`] calls will block indefinitely.
        ///
        /// # Note
        ///
        /// Some platforms do not provide access to the current timeout.
        ///
        /// [`None`]: ../../std/option/enum.Option.html#variant.None
        /// [`read()`]: ../../std/io/trait.Read.html#tymethod.read
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpStream;
        ///
        /// let stream = TcpStream::connect("127.0.0.1:8080")
        ///                        .expect("Couldn't connect to the server...");
        /// stream.set_read_timeout(None).expect("set_read_timeout call failed");
        /// assert_eq!(stream.read_timeout().unwrap(), None);
        /// ```
        #[stable(feature = "socket_timeout", since = "1.4.0")]
        pub fn read_timeout(&self) -> io::Result<Option<Duration>> {
            self.0.read_timeout()
        }

        /// Returns the write timeout of this socket.
        ///
        /// If the timeout is [`None`], then [`write()`] calls will block indefinitely.
        ///
        /// # Note
        ///
        /// Some platforms do not provide access to the current timeout.
        ///
        /// [`None`]: ../../std/option/enum.Option.html#variant.None
        /// [`write()`]: ../../std/io/trait.Write.html#tymethod.write
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpStream;
        ///
        /// let stream = TcpStream::connect("127.0.0.1:8080")
        ///                        .expect("Couldn't connect to the server...");
        /// stream.set_write_timeout(None).expect("set_write_timeout call failed");
        /// assert_eq!(stream.write_timeout().unwrap(), None);
        /// ```
        #[stable(feature = "socket_timeout", since = "1.4.0")]
        pub fn write_timeout(&self) -> io::Result<Option<Duration>> {
            self.0.write_timeout()
        }

        /// Sets the value of the `TCP_NODELAY` option on this socket.
        ///
        /// If set, this option disables the Nagle algorithm. This means that
        /// segments are always sent as soon as possible, even if there is only a
        /// small amount of data. When not set, data is buffered until there is a
        /// sufficient amount to send out, thereby avoiding the frequent sending of
        /// small packets.
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpStream;
        ///
        /// let stream = TcpStream::connect("127.0.0.1:8080")
        ///                        .expect("Couldn't connect to the server...");
        /// stream.set_nodelay(true).expect("set_nodelay call failed");
        /// ```
        #[stable(feature = "net2_mutators", since = "1.9.0")]
        pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> {
            self.0.set_nodelay(nodelay)
        }

        /// Gets the value of the `TCP_NODELAY` option on this socket.
        ///
        /// For more information about this option, see [`set_nodelay`][link].
        ///
        /// [link]: #method.set_nodelay
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpStream;
        ///
        /// let stream = TcpStream::connect("127.0.0.1:8080")
        ///                        .expect("Couldn't connect to the server...");
        /// stream.set_nodelay(true).expect("set_nodelay call failed");
        /// assert_eq!(stream.nodelay().unwrap_or(false), true);
        /// ```
        #[stable(feature = "net2_mutators", since = "1.9.0")]
        pub fn nodelay(&self) -> io::Result<bool> {
            self.0.nodelay()
        }

        /// Sets the value for the `IP_TTL` option on this socket.
        ///
        /// This value sets the time-to-live field that is used in every packet sent
        /// from this socket.
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpStream;
        ///
        /// let stream = TcpStream::connect("127.0.0.1:8080")
        ///                        .expect("Couldn't connect to the server...");
        /// stream.set_ttl(100).expect("set_ttl call failed");
        /// ```
        #[stable(feature = "net2_mutators", since = "1.9.0")]
        pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
            self.0.set_ttl(ttl)
        }

        /// Gets the value of the `IP_TTL` option for this socket.
        ///
        /// For more information about this option, see [`set_ttl`][link].
        ///
        /// [link]: #method.set_ttl
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpStream;
        ///
        /// let stream = TcpStream::connect("127.0.0.1:8080")
        ///                        .expect("Couldn't connect to the server...");
        /// stream.set_ttl(100).expect("set_ttl call failed");
        /// assert_eq!(stream.ttl().unwrap_or(0), 100);
        /// ```
        #[stable(feature = "net2_mutators", since = "1.9.0")]
        pub fn ttl(&self) -> io::Result<u32> {
            self.0.ttl()
        }

        /// Get the value of the `SO_ERROR` option on this socket.
        ///
        /// This will retrieve the stored error in the underlying socket, clearing
        /// the field in the process. This can be useful for checking errors between
        /// calls.
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpStream;
        ///
        /// let stream = TcpStream::connect("127.0.0.1:8080")
        ///                        .expect("Couldn't connect to the server...");
        /// stream.take_error().expect("No error was expected...");
        /// ```
        #[stable(feature = "net2_mutators", since = "1.9.0")]
        pub fn take_error(&self) -> io::Result<Option<io::Error>> {
            self.0.take_error()
        }

        /// Moves this TCP stream into or out of nonblocking mode.
        ///
        /// On Unix this corresponds to calling fcntl, and on Windows this
        /// corresponds to calling ioctlsocket.
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpStream;
        ///
        /// let stream = TcpStream::connect("127.0.0.1:8080")
        ///                        .expect("Couldn't connect to the server...");
        /// stream.set_nonblocking(true).expect("set_nonblocking call failed");
        /// ```
        #[stable(feature = "net2_mutators", since = "1.9.0")]
        pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
            self.0.set_nonblocking(nonblocking)
        }
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    impl Read for TcpStream {
        fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> { self.0.read(buf) }
        fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
            self.0.read_to_end(buf)
        }
    }
    #[stable(feature = "rust1", since = "1.0.0")]
    impl Write for TcpStream {
        fn write(&mut self, buf: &[u8]) -> io::Result<usize> { self.0.write(buf) }
        fn flush(&mut self) -> io::Result<()> { Ok(()) }
    }
    #[stable(feature = "rust1", since = "1.0.0")]
    impl<'a> Read for &'a TcpStream {
        fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> { self.0.read(buf) }
        fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
            self.0.read_to_end(buf)
        }
    }
    #[stable(feature = "rust1", since = "1.0.0")]
    impl<'a> Write for &'a TcpStream {
        fn write(&mut self, buf: &[u8]) -> io::Result<usize> { self.0.write(buf) }
        fn flush(&mut self) -> io::Result<()> { Ok(()) }
    }

    impl AsInner<net_imp::TcpStream> for TcpStream {
        fn as_inner(&self) -> &net_imp::TcpStream { &self.0 }
    }

    impl FromInner<net_imp::TcpStream> for TcpStream {
        fn from_inner(inner: net_imp::TcpStream) -> TcpStream { TcpStream(inner) }
    }

    impl IntoInner<net_imp::TcpStream> for TcpStream {
        fn into_inner(self) -> net_imp::TcpStream { self.0 }
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    impl fmt::Debug for TcpStream {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            self.0.fmt(f)
        }
    }

    impl TcpListener {
        /// Creates a new `TcpListener` which will be bound to the specified
        /// address.
        ///
        /// The returned listener is ready for accepting connections.
        ///
        /// Binding with a port number of 0 will request that the OS assigns a port
        /// to this listener. The port allocated can be queried via the
        /// `local_addr` method.
        ///
        /// The address type can be any implementor of `ToSocketAddrs` trait. See
        /// its documentation for concrete examples.
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpListener;
        ///
        /// let listener = TcpListener::bind("127.0.0.1:80").unwrap();
        /// ```
        #[stable(feature = "rust1", since = "1.0.0")]
        pub fn bind<A: ToSocketAddrs>(addr: A) -> io::Result<TcpListener> {
            super::each_addr(addr, net_imp::TcpListener::bind).map(TcpListener)
        }

        /// Returns the local socket address of this listener.
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::{Ipv4Addr, SocketAddr, SocketAddrV4, TcpListener};
        ///
        /// let listener = TcpListener::bind("127.0.0.1:8080").unwrap();
        /// assert_eq!(listener.local_addr().unwrap(),
        ///            SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080)));
        /// ```
        #[stable(feature = "rust1", since = "1.0.0")]
        pub fn local_addr(&self) -> io::Result<SocketAddr> {
            self.0.socket_addr()
        }

        /// Creates a new independently owned handle to the underlying socket.
        ///
        /// The returned `TcpListener` 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::net::TcpListener;
        ///
        /// let listener = TcpListener::bind("127.0.0.1:8080").unwrap();
        /// let listener_clone = listener.try_clone().unwrap();
        /// ```
        #[stable(feature = "rust1", since = "1.0.0")]
        pub fn try_clone(&self) -> io::Result<TcpListener> {
            self.0.duplicate().map(TcpListener)
        }

        /// Accept a new incoming connection from this listener.
        ///
        /// This function will block the calling thread until a new TCP connection
        /// is established. When established, the corresponding `TcpStream` and the
        /// remote peer's address will be returned.
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpListener;
        ///
        /// let listener = TcpListener::bind("127.0.0.1:8080").unwrap();
        /// match listener.accept() {
        ///     Ok((_socket, addr)) => println!("new client: {:?}", addr),
        ///     Err(e) => println!("couldn't get client: {:?}", e),
        /// }
        /// ```
        #[stable(feature = "rust1", since = "1.0.0")]
        pub fn accept(&self) -> io::Result<(TcpStream, SocketAddr)> {
            self.0.accept().map(|(a, b)| (TcpStream(a), b))
        }

        /// Returns an iterator over the connections being received on this
        /// listener.
        ///
        /// The returned iterator will never return [`None`] and will also not yield
        /// the peer's [`SocketAddr`] structure.
        ///
        /// [`None`]: ../../std/option/enum.Option.html#variant.None
        /// [`SocketAddr`]: ../../std/net/enum.SocketAddr.html
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpListener;
        ///
        /// let listener = TcpListener::bind("127.0.0.1:80").unwrap();
        ///
        /// for stream in listener.incoming() {
        ///     match stream {
        ///         Ok(stream) => {
        ///             println!("new client!");
        ///         }
        ///         Err(e) => { /* connection failed */ }
        ///     }
        /// }
        /// ```
        #[stable(feature = "rust1", since = "1.0.0")]
        pub fn incoming(&self) -> Incoming {
            Incoming { listener: self }
        }

        /// Sets the value for the `IP_TTL` option on this socket.
        ///
        /// This value sets the time-to-live field that is used in every packet sent
        /// from this socket.
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpListener;
        ///
        /// let listener = TcpListener::bind("127.0.0.1:80").unwrap();
        /// listener.set_ttl(100).expect("could not set TTL");
        /// ```
        #[stable(feature = "net2_mutators", since = "1.9.0")]
        pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
            self.0.set_ttl(ttl)
        }

        /// Gets the value of the `IP_TTL` option for this socket.
        ///
        /// For more information about this option, see [`set_ttl()`][link].
        ///
        /// [link]: #method.set_ttl
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpListener;
        ///
        /// let listener = TcpListener::bind("127.0.0.1:80").unwrap();
        /// listener.set_ttl(100).expect("could not set TTL");
        /// assert_eq!(listener.ttl().unwrap_or(0), 100);
        /// ```
        #[stable(feature = "net2_mutators", since = "1.9.0")]
        pub fn ttl(&self) -> io::Result<u32> {
            self.0.ttl()
        }

        #[stable(feature = "net2_mutators", since = "1.9.0")]
        #[rustc_deprecated(since = "1.16.0",
                           reason = "this option can only be set before the socket is bound")]
        #[allow(missing_docs)]
        pub fn set_only_v6(&self, only_v6: bool) -> io::Result<()> {
            self.0.set_only_v6(only_v6)
        }

        #[stable(feature = "net2_mutators", since = "1.9.0")]
        #[rustc_deprecated(since = "1.16.0",
                           reason = "this option can only be set before the socket is bound")]
        #[allow(missing_docs)]
        pub fn only_v6(&self) -> io::Result<bool> {
            self.0.only_v6()
        }

        /// Get the value of the `SO_ERROR` option on this socket.
        ///
        /// This will retrieve the stored error in the underlying socket, clearing
        /// the field in the process. This can be useful for checking errors between
        /// calls.
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpListener;
        ///
        /// let listener = TcpListener::bind("127.0.0.1:80").unwrap();
        /// listener.take_error().expect("No error was expected");
        /// ```
        #[stable(feature = "net2_mutators", since = "1.9.0")]
        pub fn take_error(&self) -> io::Result<Option<io::Error>> {
            self.0.take_error()
        }

        /// Moves this TCP stream into or out of nonblocking mode.
        ///
        /// On Unix this corresponds to calling fcntl, and on Windows this
        /// corresponds to calling ioctlsocket.
        ///
        /// # Examples
        ///
        /// ```no_run
        /// use std::net::TcpListener;
        ///
        /// let listener = TcpListener::bind("127.0.0.1:80").unwrap();
        /// listener.set_nonblocking(true).expect("Cannot set non-blocking");
        /// ```
        #[stable(feature = "net2_mutators", since = "1.9.0")]
        pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
            self.0.set_nonblocking(nonblocking)
        }
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    impl<'a> Iterator for Incoming<'a> {
        type Item = io::Result<TcpStream>;
        fn next(&mut self) -> Option<io::Result<TcpStream>> {
            Some(self.listener.accept().map(|p| p.0))
        }
    }

    impl AsInner<net_imp::TcpListener> for TcpListener {
        fn as_inner(&self) -> &net_imp::TcpListener { &self.0 }
    }

    impl FromInner<net_imp::TcpListener> for TcpListener {
        fn from_inner(inner: net_imp::TcpListener) -> TcpListener {
            TcpListener(inner)
        }
    }

    impl IntoInner<net_imp::TcpListener> for TcpListener {
        fn into_inner(self) -> net_imp::TcpListener { self.0 }
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    impl fmt::Debug for TcpListener {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            self.0.fmt(f)
        }
    }

    #[cfg(all(test, not(target_os = "emscripten")))]
    mod tests {
        use io::ErrorKind;
        use io::prelude::*;
        use net::*;
        use net::test::{next_test_ip4, next_test_ip6};
        use sync::mpsc::channel;
        use sys_common::AsInner;
        use time::{Instant, Duration};
        use thread;

        fn each_ip(f: &mut FnMut(SocketAddr)) {
            f(next_test_ip4());
            f(next_test_ip6());
        }

        macro_rules! t {
            ($e:expr) => {
                match $e {
                    Ok(t) => t,
                    Err(e) => panic!("received error for `{}`: {}", stringify!($e), e),
                }
            }
        }

        #[test]
        fn bind_error() {
            match TcpListener::bind("1.1.1.1:9999") {
                Ok(..) => panic!(),
                Err(e) =>
                    assert_eq!(e.kind(), ErrorKind::AddrNotAvailable),
            }
        }

        #[test]
        fn connect_error() {
            match TcpStream::connect("0.0.0.0:1") {
                Ok(..) => panic!(),
                Err(e) => assert!(e.kind() == ErrorKind::ConnectionRefused ||
                                  e.kind() == ErrorKind::InvalidInput ||
                                  e.kind() == ErrorKind::AddrInUse ||
                                  e.kind() == ErrorKind::AddrNotAvailable,
                                  "bad error: {} {:?}", e, e.kind()),
            }
        }

        #[test]
        fn listen_localhost() {
            let socket_addr = next_test_ip4();
            let listener = t!(TcpListener::bind(&socket_addr));

            let _t = thread::spawn(move || {
                let mut stream = t!(TcpStream::connect(&("localhost",
                                                         socket_addr.port())));
                t!(stream.write(&[144]));
            });

            let mut stream = t!(listener.accept()).0;
            let mut buf = [0];
            t!(stream.read(&mut buf));
            assert!(buf[0] == 144);
        }

        #[test]
        fn connect_loopback() {
            each_ip(&mut |addr| {
                let acceptor = t!(TcpListener::bind(&addr));

                let _t = thread::spawn(move|| {
                    let host = match addr {
                        SocketAddr::V4(..) => "127.0.0.1",
                        SocketAddr::V6(..) => "::1",
                    };
                    let mut stream = t!(TcpStream::connect(&(host, addr.port())));
                    t!(stream.write(&[66]));
                });

                let mut stream = t!(acceptor.accept()).0;
                let mut buf = [0];
                t!(stream.read(&mut buf));
                assert!(buf[0] == 66);
            })
        }

        #[test]
        fn smoke_test() {
            each_ip(&mut |addr| {
                let acceptor = t!(TcpListener::bind(&addr));

                let (tx, rx) = channel();
                let _t = thread::spawn(move|| {
                    let mut stream = t!(TcpStream::connect(&addr));
                    t!(stream.write(&[99]));
                    tx.send(t!(stream.local_addr())).unwrap();
                });

                let (mut stream, addr) = t!(acceptor.accept());
                let mut buf = [0];
                t!(stream.read(&mut buf));
                assert!(buf[0] == 99);
                assert_eq!(addr, t!(rx.recv()));
            })
        }

        #[test]
        fn read_eof() {
            each_ip(&mut |addr| {
                let acceptor = t!(TcpListener::bind(&addr));

                let _t = thread::spawn(move|| {
                    let _stream = t!(TcpStream::connect(&addr));
                    // Close
                });

                let mut stream = t!(acceptor.accept()).0;
                let mut buf = [0];
                let nread = t!(stream.read(&mut buf));
                assert_eq!(nread, 0);
                let nread = t!(stream.read(&mut buf));
                assert_eq!(nread, 0);
            })
        }

        #[test]
        fn write_close() {
            each_ip(&mut |addr| {
                let acceptor = t!(TcpListener::bind(&addr));

                let (tx, rx) = channel();
                let _t = thread::spawn(move|| {
                    drop(t!(TcpStream::connect(&addr)));
                    tx.send(()).unwrap();
                });

                let mut stream = t!(acceptor.accept()).0;
                rx.recv().unwrap();
                let buf = [0];
                match stream.write(&buf) {
                    Ok(..) => {}
                    Err(e) => {
                        assert!(e.kind() == ErrorKind::ConnectionReset ||
                                e.kind() == ErrorKind::BrokenPipe ||
                                e.kind() == ErrorKind::ConnectionAborted,
                                "unknown error: {}", e);
                    }
                }
            })
        }

        #[test]
        fn multiple_connect_serial() {
            each_ip(&mut |addr| {
                let max = 10;
                let acceptor = t!(TcpListener::bind(&addr));

                let _t = thread::spawn(move|| {
                    for _ in 0..max {
                        let mut stream = t!(TcpStream::connect(&addr));
                        t!(stream.write(&[99]));
                    }
                });

                for stream in acceptor.incoming().take(max) {
                    let mut stream = t!(stream);
                    let mut buf = [0];
                    t!(stream.read(&mut buf));
                    assert_eq!(buf[0], 99);
                }
            })
        }

        #[test]
        fn multiple_connect_interleaved_greedy_schedule() {
            const MAX: usize = 10;
            each_ip(&mut |addr| {
                let acceptor = t!(TcpListener::bind(&addr));

                let _t = thread::spawn(move|| {
                    let acceptor = acceptor;
                    for (i, stream) in acceptor.incoming().enumerate().take(MAX) {
                        // Start another thread to handle the connection
                        let _t = thread::spawn(move|| {
                            let mut stream = t!(stream);
                            let mut buf = [0];
                            t!(stream.read(&mut buf));
                            assert!(buf[0] == i as u8);
                        });
                    }
                });

                connect(0, addr);
            });

            fn connect(i: usize, addr: SocketAddr) {
                if i == MAX { return }

                let t = thread::spawn(move|| {
                    let mut stream = t!(TcpStream::connect(&addr));
                    // Connect again before writing
                    connect(i + 1, addr);
                    t!(stream.write(&[i as u8]));
                });
                t.join().ok().unwrap();
            }
        }

        #[test]
        fn multiple_connect_interleaved_lazy_schedule() {
            const MAX: usize = 10;
            each_ip(&mut |addr| {
                let acceptor = t!(TcpListener::bind(&addr));

                let _t = thread::spawn(move|| {
                    for stream in acceptor.incoming().take(MAX) {
                        // Start another thread to handle the connection
                        let _t = thread::spawn(move|| {
                            let mut stream = t!(stream);
                            let mut buf = [0];
                            t!(stream.read(&mut buf));
                            assert!(buf[0] == 99);
                        });
                    }
                });

                connect(0, addr);
            });

            fn connect(i: usize, addr: SocketAddr) {
                if i == MAX { return }

                let t = thread::spawn(move|| {
                    let mut stream = t!(TcpStream::connect(&addr));
                    connect(i + 1, addr);
                    t!(stream.write(&[99]));
                });
                t.join().ok().unwrap();
            }
        }

        #[test]
        fn socket_and_peer_name() {
            each_ip(&mut |addr| {
                let listener = t!(TcpListener::bind(&addr));
                let so_name = t!(listener.local_addr());
                assert_eq!(addr, so_name);
                let _t = thread::spawn(move|| {
                    t!(listener.accept());
                });

                let stream = t!(TcpStream::connect(&addr));
                assert_eq!(addr, t!(stream.peer_addr()));
            })
        }

        #[test]
        fn partial_read() {
            each_ip(&mut |addr| {
                let (tx, rx) = channel();
                let srv = t!(TcpListener::bind(&addr));
                let _t = thread::spawn(move|| {
                    let mut cl = t!(srv.accept()).0;
                    cl.write(&[10]).unwrap();
                    let mut b = [0];
                    t!(cl.read(&mut b));
                    tx.send(()).unwrap();
                });

                let mut c = t!(TcpStream::connect(&addr));
                let mut b = [0; 10];
                assert_eq!(c.read(&mut b).unwrap(), 1);
                t!(c.write(&[1]));
                rx.recv().unwrap();
            })
        }

        #[test]
        fn double_bind() {
            each_ip(&mut |addr| {
                let _listener = t!(TcpListener::bind(&addr));
                match TcpListener::bind(&addr) {
                    Ok(..) => panic!(),
                    Err(e) => {
                        assert!(e.kind() == ErrorKind::ConnectionRefused ||
                                e.kind() == ErrorKind::Other ||
                                e.kind() == ErrorKind::AddrInUse,
                                "unknown error: {} {:?}", e, e.kind());
                    }
                }
            })
        }

        #[test]
        fn fast_rebind() {
            each_ip(&mut |addr| {
                let acceptor = t!(TcpListener::bind(&addr));

                let _t = thread::spawn(move|| {
                    t!(TcpStream::connect(&addr));
                });

                t!(acceptor.accept());
                drop(acceptor);
                t!(TcpListener::bind(&addr));
            });
        }

        #[test]
        fn tcp_clone_smoke() {
            each_ip(&mut |addr| {
                let acceptor = t!(TcpListener::bind(&addr));

                let _t = thread::spawn(move|| {
                    let mut s = t!(TcpStream::connect(&addr));
                    let mut buf = [0, 0];
                    assert_eq!(s.read(&mut buf).unwrap(), 1);
                    assert_eq!(buf[0], 1);
                    t!(s.write(&[2]));
                });

                let mut s1 = t!(acceptor.accept()).0;
                let s2 = t!(s1.try_clone());

                let (tx1, rx1) = channel();
                let (tx2, rx2) = channel();
                let _t = thread::spawn(move|| {
                    let mut s2 = s2;
                    rx1.recv().unwrap();
                    t!(s2.write(&[1]));
                    tx2.send(()).unwrap();
                });
                tx1.send(()).unwrap();
                let mut buf = [0, 0];
                assert_eq!(s1.read(&mut buf).unwrap(), 1);
                rx2.recv().unwrap();
            })
        }

        #[test]
        fn tcp_clone_two_read() {
            each_ip(&mut |addr| {
                let acceptor = t!(TcpListener::bind(&addr));
                let (tx1, rx) = channel();
                let tx2 = tx1.clone();

                let _t = thread::spawn(move|| {
                    let mut s = t!(TcpStream::connect(&addr));
                    t!(s.write(&[1]));
                    rx.recv().unwrap();
                    t!(s.write(&[2]));
                    rx.recv().unwrap();
                });

                let mut s1 = t!(acceptor.accept()).0;
                let s2 = t!(s1.try_clone());

                let (done, rx) = channel();
                let _t = thread::spawn(move|| {
                    let mut s2 = s2;
                    let mut buf = [0, 0];
                    t!(s2.read(&mut buf));
                    tx2.send(()).unwrap();
                    done.send(()).unwrap();
                });
                let mut buf = [0, 0];
                t!(s1.read(&mut buf));
                tx1.send(()).unwrap();

                rx.recv().unwrap();
            })
        }

        #[test]
        fn tcp_clone_two_write() {
            each_ip(&mut |addr| {
                let acceptor = t!(TcpListener::bind(&addr));

                let _t = thread::spawn(move|| {
                    let mut s = t!(TcpStream::connect(&addr));
                    let mut buf = [0, 1];
                    t!(s.read(&mut buf));
                    t!(s.read(&mut buf));
                });

                let mut s1 = t!(acceptor.accept()).0;
                let s2 = t!(s1.try_clone());

                let (done, rx) = channel();
                let _t = thread::spawn(move|| {
                    let mut s2 = s2;
                    t!(s2.write(&[1]));
                    done.send(()).unwrap();
                });
                t!(s1.write(&[2]));

                rx.recv().unwrap();
            })
        }

        #[test]
        fn shutdown_smoke() {
            each_ip(&mut |addr| {
                let a = t!(TcpListener::bind(&addr));
                let _t = thread::spawn(move|| {
                    let mut c = t!(a.accept()).0;
                    let mut b = [0];
                    assert_eq!(c.read(&mut b).unwrap(), 0);
                    t!(c.write(&[1]));
                });

                let mut s = t!(TcpStream::connect(&addr));
                t!(s.shutdown(Shutdown::Write));
                assert!(s.write(&[1]).is_err());
                let mut b = [0, 0];
                assert_eq!(t!(s.read(&mut b)), 1);
                assert_eq!(b[0], 1);
            })
        }

        #[test]
        fn close_readwrite_smoke() {
            each_ip(&mut |addr| {
                let a = t!(TcpListener::bind(&addr));
                let (tx, rx) = channel::<()>();
                let _t = thread::spawn(move|| {
                    let _s = t!(a.accept());
                    let _ = rx.recv();
                });

                let mut b = [0];
                let mut s = t!(TcpStream::connect(&addr));
                let mut s2 = t!(s.try_clone());

                // closing should prevent reads/writes
                t!(s.shutdown(Shutdown::Write));
                assert!(s.write(&[0]).is_err());
                t!(s.shutdown(Shutdown::Read));
                assert_eq!(s.read(&mut b).unwrap(), 0);

                // closing should affect previous handles
                assert!(s2.write(&[0]).is_err());
                assert_eq!(s2.read(&mut b).unwrap(), 0);

                // closing should affect new handles
                let mut s3 = t!(s.try_clone());
                assert!(s3.write(&[0]).is_err());
                assert_eq!(s3.read(&mut b).unwrap(), 0);

                // make sure these don't die
                let _ = s2.shutdown(Shutdown::Read);
                let _ = s2.shutdown(Shutdown::Write);
                let _ = s3.shutdown(Shutdown::Read);
                let _ = s3.shutdown(Shutdown::Write);
                drop(tx);
            })
        }

        #[test]
        #[cfg(unix)] // test doesn't work on Windows, see #31657
        fn close_read_wakes_up() {
            each_ip(&mut |addr| {
                let a = t!(TcpListener::bind(&addr));
                let (tx1, rx) = channel::<()>();
                let _t = thread::spawn(move|| {
                    let _s = t!(a.accept());
                    let _ = rx.recv();
                });

                let s = t!(TcpStream::connect(&addr));
                let s2 = t!(s.try_clone());
                let (tx, rx) = channel();
                let _t = thread::spawn(move|| {
                    let mut s2 = s2;
                    assert_eq!(t!(s2.read(&mut [0])), 0);
                    tx.send(()).unwrap();
                });
                // this should wake up the child thread
                t!(s.shutdown(Shutdown::Read));

                // this test will never finish if the child doesn't wake up
                rx.recv().unwrap();
                drop(tx1);
            })
        }

        #[test]
        fn clone_while_reading() {
            each_ip(&mut |addr| {
                let accept = t!(TcpListener::bind(&addr));

                // Enqueue a thread to write to a socket
                let (tx, rx) = channel();
                let (txdone, rxdone) = channel();
                let txdone2 = txdone.clone();
                let _t = thread::spawn(move|| {
                    let mut tcp = t!(TcpStream::connect(&addr));
                    rx.recv().unwrap();
                    t!(tcp.write(&[0]));
                    txdone2.send(()).unwrap();
                });

                // Spawn off a reading clone
                let tcp = t!(accept.accept()).0;
                let tcp2 = t!(tcp.try_clone());
                let txdone3 = txdone.clone();
                let _t = thread::spawn(move|| {
                    let mut tcp2 = tcp2;
                    t!(tcp2.read(&mut [0]));
                    txdone3.send(()).unwrap();
                });

                // Try to ensure that the reading clone is indeed reading
                for _ in 0..50 {
                    thread::yield_now();
                }

                // clone the handle again while it's reading, then let it finish the
                // read.
                let _ = t!(tcp.try_clone());
                tx.send(()).unwrap();
                rxdone.recv().unwrap();
                rxdone.recv().unwrap();
            })
        }

        #[test]
        fn clone_accept_smoke() {
            each_ip(&mut |addr| {
                let a = t!(TcpListener::bind(&addr));
                let a2 = t!(a.try_clone());

                let _t = thread::spawn(move|| {
                    let _ = TcpStream::connect(&addr);
                });
                let _t = thread::spawn(move|| {
                    let _ = TcpStream::connect(&addr);
                });

                t!(a.accept());
                t!(a2.accept());
            })
        }

        #[test]
        fn clone_accept_concurrent() {
            each_ip(&mut |addr| {
                let a = t!(TcpListener::bind(&addr));
                let a2 = t!(a.try_clone());

                let (tx, rx) = channel();
                let tx2 = tx.clone();

                let _t = thread::spawn(move|| {
                    tx.send(t!(a.accept())).unwrap();
                });
                let _t = thread::spawn(move|| {
                    tx2.send(t!(a2.accept())).unwrap();
                });

                let _t = thread::spawn(move|| {
                    let _ = TcpStream::connect(&addr);
                });
                let _t = thread::spawn(move|| {
                    let _ = TcpStream::connect(&addr);
                });

                rx.recv().unwrap();
                rx.recv().unwrap();
            })
        }

        #[test]
        fn debug() {
            let name = if cfg!(windows) {"socket"} else {"fd"};
            let socket_addr = next_test_ip4();

            let listener = t!(TcpListener::bind(&socket_addr));
            let listener_inner = listener.0.socket().as_inner();
            let compare = format!("TcpListener {{ addr: {:?}, {}: {:?} }}",
                                  socket_addr, name, listener_inner);
            assert_eq!(format!("{:?}", listener), compare);

            let stream = t!(TcpStream::connect(&("localhost",
                                                     socket_addr.port())));
            let stream_inner = stream.0.socket().as_inner();
            let compare = format!("TcpStream {{ addr: {:?}, \
                                  peer: {:?}, {}: {:?} }}",
                                  stream.local_addr().unwrap(),
                                  stream.peer_addr().unwrap(),
                                  name,
                                  stream_inner);
            assert_eq!(format!("{:?}", stream), compare);
        }

        // FIXME: re-enabled bitrig/openbsd tests once their socket timeout code
        //        no longer has rounding errors.
        #[cfg_attr(any(target_os = "bitrig", target_os = "netbsd", target_os = "openbsd"), ignore)]
        #[test]
        fn timeouts() {
            let addr = next_test_ip4();
            let listener = t!(TcpListener::bind(&addr));

            let stream = t!(TcpStream::connect(&("localhost", addr.port())));
            let dur = Duration::new(15410, 0);

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

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

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

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

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

            t!(stream.set_write_timeout(None));
            assert_eq!(None, t!(stream.write_timeout()));
            drop(listener);
        }

        #[test]
        fn test_read_timeout() {
            let addr = next_test_ip4();
            let listener = t!(TcpListener::bind(&addr));

            let mut stream = t!(TcpStream::connect(&("localhost", addr.port())));
            t!(stream.set_read_timeout(Some(Duration::from_millis(1000))));

            let mut buf = [0; 10];
            let start = Instant::now();
            let kind = stream.read(&mut buf).err().expect("expected error").kind();
            assert!(kind == ErrorKind::WouldBlock || kind == ErrorKind::TimedOut);
            assert!(start.elapsed() > Duration::from_millis(400));
            drop(listener);
        }

        #[test]
        fn test_read_with_timeout() {
            let addr = next_test_ip4();
            let listener = t!(TcpListener::bind(&addr));

            let mut stream = t!(TcpStream::connect(&("localhost", addr.port())));
            t!(stream.set_read_timeout(Some(Duration::from_millis(1000))));

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

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

            let start = Instant::now();
            let kind = stream.read(&mut buf).err().expect("expected error").kind();
            assert!(kind == ErrorKind::WouldBlock || kind == ErrorKind::TimedOut);
            assert!(start.elapsed() > Duration::from_millis(400));
            drop(listener);
        }

        #[test]
        fn nodelay() {
            let addr = next_test_ip4();
            let _listener = t!(TcpListener::bind(&addr));

            let stream = t!(TcpStream::connect(&("localhost", addr.port())));

            assert_eq!(false, t!(stream.nodelay()));
            t!(stream.set_nodelay(true));
            assert_eq!(true, t!(stream.nodelay()));
            t!(stream.set_nodelay(false));
            assert_eq!(false, t!(stream.nodelay()));
        }

        #[test]
        fn ttl() {
            let ttl = 100;

            let addr = next_test_ip4();
            let listener = t!(TcpListener::bind(&addr));

            t!(listener.set_ttl(ttl));
            assert_eq!(ttl, t!(listener.ttl()));

            let stream = t!(TcpStream::connect(&("localhost", addr.port())));

            t!(stream.set_ttl(ttl));
            assert_eq!(ttl, t!(stream.ttl()));
        }

        #[test]
        fn set_nonblocking() {
            let addr = next_test_ip4();
            let listener = t!(TcpListener::bind(&addr));

            t!(listener.set_nonblocking(true));
            t!(listener.set_nonblocking(false));

            let mut stream = t!(TcpStream::connect(&("localhost", addr.port())));

            t!(stream.set_nonblocking(false));
            t!(stream.set_nonblocking(true));

            let mut buf = [0];
            match stream.read(&mut buf) {
                Ok(_) => panic!("expected error"),
                Err(ref e) if e.kind() == ErrorKind::WouldBlock => {}
                Err(e) => panic!("unexpected error {}", e),
            }
        }
    }

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