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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 std::io;
    use std::mem;
    use std::net::{TcpListener, TcpStream, UdpSocket};
    use std::os::unix::io::FromRawFd;
    use libc::{self, c_int};
    #[cfg(not(any(target_os = "solaris", target_os = "emscripten")))]
    use libc::{ioctl, FIOCLEX};

    mod impls;

    pub mod c {
        pub use libc::*;

        pub fn sockaddr_in_u32(sa: &sockaddr_in) -> u32 {
            ::ntoh((*sa).sin_addr.s_addr)
        }

        pub fn in_addr_to_u32(addr: &in_addr) -> u32 {
            ::ntoh(addr.s_addr)
        }
    }

    pub struct Socket {
        fd: c_int,
    }

    impl Socket {
        #[cfg(not(any(target_os = "solaris", target_os = "emscripten")))]
        pub fn new(family: c_int, ty: c_int) -> io::Result<Socket> {
            unsafe {
                // Linux >2.6.26 overloads the type argument to accept SOCK_CLOEXEC,
                // avoiding a race with another thread running fork/exec between
                // socket() and ioctl()
                #[cfg(any(target_os = "linux", target_os = "android"))]
                match ::cvt(libc::socket(family, ty | libc::SOCK_CLOEXEC, 0)) {
                    Ok(fd) => return Ok(Socket { fd: fd }),
                    // Older versions of Linux return EINVAL; fall back to ioctl
                    Err(ref e) if e.raw_os_error() == Some(libc::EINVAL) => {}
                    Err(e) => return Err(e),
                }

                let fd = try!(::cvt(libc::socket(family, ty, 0)));
                ioctl(fd, FIOCLEX);
                Ok(Socket { fd: fd })
            }
        }

        // ioctl(FIOCLEX) is not supported by Solaris/Illumos or emscripten,
        // use fcntl(FD_CLOEXEC) instead
        #[cfg(any(target_os = "solaris", target_os = "emscripten"))]
        pub fn new(family: c_int, ty: c_int) -> io::Result<Socket> {
            unsafe {
                let fd = try!(::cvt(libc::socket(family, ty, 0)));
                libc::fcntl(fd, libc::FD_CLOEXEC);
                Ok(Socket { fd: fd })
            }
        }

        pub fn raw(&self) -> c_int { self.fd }

        fn into_fd(self) -> c_int {
            let fd = self.fd;
            mem::forget(self);
            fd
        }

        pub fn into_tcp_listener(self) -> TcpListener {
            unsafe { TcpListener::from_raw_fd(self.into_fd()) }
        }

        pub fn into_tcp_stream(self) -> TcpStream {
            unsafe { TcpStream::from_raw_fd(self.into_fd()) }
        }

        pub fn into_udp_socket(self) -> UdpSocket {
            unsafe { UdpSocket::from_raw_fd(self.into_fd()) }
        }
    }

    impl ::FromInner for Socket {
        type Inner = c_int;
        fn from_inner(fd: c_int) -> Socket {
            Socket { fd: fd }
        }
    }

    impl Drop for Socket {
        fn drop(&mut self) {
            unsafe {
                let _ = libc::close(self.fd);
            }
        }
    }

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