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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.

    #![stable(feature = "rust1", since = "1.0.0")]

    use fs;
    use os::windows::raw;
    use net;
    use sys_common::{self, AsInner, FromInner, IntoInner};
    use sys;
    use io;
    use sys::c;

    /// Raw HANDLEs.
    #[stable(feature = "rust1", since = "1.0.0")]
    pub type RawHandle = raw::HANDLE;

    /// Raw SOCKETs.
    #[stable(feature = "rust1", since = "1.0.0")]
    pub type RawSocket = raw::SOCKET;

    /// Extract raw handles.
    #[stable(feature = "rust1", since = "1.0.0")]
    pub trait AsRawHandle {
        /// Extracts the raw handle, without taking any ownership.
        #[stable(feature = "rust1", since = "1.0.0")]
        fn as_raw_handle(&self) -> RawHandle;
    }

    /// Construct I/O objects from raw handles.
    #[stable(feature = "from_raw_os", since = "1.1.0")]
    pub trait FromRawHandle {
        /// Constructs a new I/O object from the specified raw handle.
        ///
        /// This function will **consume ownership** of the handle given,
        /// passing responsibility for closing the handle to the returned
        /// object.
        ///
        /// This function is also unsafe as the primitives currently returned
        /// have the contract that they are the sole owner of the file
        /// descriptor they are wrapping. Usage of this function could
        /// accidentally allow violating this contract which can cause memory
        /// unsafety in code that relies on it being true.
        #[stable(feature = "from_raw_os", since = "1.1.0")]
        unsafe fn from_raw_handle(handle: RawHandle) -> Self;
    }

    /// A trait to express the ability to consume an object and acquire ownership of
    /// its raw `HANDLE`.
    #[stable(feature = "into_raw_os", since = "1.4.0")]
    pub trait IntoRawHandle {
        /// Consumes this object, returning the raw underlying handle.
        ///
        /// This function **transfers ownership** of the underlying handle to the
        /// caller. Callers are then the unique owners of the handle and must close
        /// it once it's no longer needed.
        #[stable(feature = "into_raw_os", since = "1.4.0")]
        fn into_raw_handle(self) -> RawHandle;
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    impl AsRawHandle for fs::File {
        fn as_raw_handle(&self) -> RawHandle {
            self.as_inner().handle().raw() as RawHandle
        }
    }

    #[stable(feature = "asraw_stdio", since = "1.21.0")]
    impl AsRawHandle for io::Stdin {
        fn as_raw_handle(&self) -> RawHandle {
            unsafe { c::GetStdHandle(c::STD_INPUT_HANDLE) as RawHandle }
        }
    }

    #[stable(feature = "asraw_stdio", since = "1.21.0")]
    impl AsRawHandle for io::Stdout {
        fn as_raw_handle(&self) -> RawHandle {
            unsafe { c::GetStdHandle(c::STD_OUTPUT_HANDLE) as RawHandle }
        }
    }

    #[stable(feature = "asraw_stdio", since = "1.21.0")]
    impl AsRawHandle for io::Stderr {
        fn as_raw_handle(&self) -> RawHandle {
            unsafe { c::GetStdHandle(c::STD_ERROR_HANDLE) as RawHandle }
        }
    }

    #[stable(feature = "from_raw_os", since = "1.1.0")]
    impl FromRawHandle for fs::File {
        unsafe fn from_raw_handle(handle: RawHandle) -> fs::File {
            let handle = handle as c::HANDLE;
            fs::File::from_inner(sys::fs::File::from_inner(handle))
        }
    }

    #[stable(feature = "into_raw_os", since = "1.4.0")]
    impl IntoRawHandle for fs::File {
        fn into_raw_handle(self) -> RawHandle {
            self.into_inner().into_handle().into_raw() as *mut _
        }
    }

    /// Extract raw sockets.
    #[stable(feature = "rust1", since = "1.0.0")]
    pub trait AsRawSocket {
        /// Extracts the underlying raw socket from this object.
        #[stable(feature = "rust1", since = "1.0.0")]
        fn as_raw_socket(&self) -> RawSocket;
    }

    /// Create I/O objects from raw sockets.
    #[stable(feature = "from_raw_os", since = "1.1.0")]
    pub trait FromRawSocket {
        /// Creates a new I/O object from the given raw socket.
        ///
        /// This function will **consume ownership** of the socket provided and
        /// it will be closed when the returned object goes out of scope.
        ///
        /// This function is also unsafe as the primitives currently returned
        /// have the contract that they are the sole owner of the file
        /// descriptor they are wrapping. Usage of this function could
        /// accidentally allow violating this contract which can cause memory
        /// unsafety in code that relies on it being true.
        #[stable(feature = "from_raw_os", since = "1.1.0")]
        unsafe fn from_raw_socket(sock: RawSocket) -> Self;
    }

    /// A trait to express the ability to consume an object and acquire ownership of
    /// its raw `SOCKET`.
    #[stable(feature = "into_raw_os", since = "1.4.0")]
    pub trait IntoRawSocket {
        /// Consumes this object, returning the raw underlying socket.
        ///
        /// This function **transfers ownership** of the underlying socket to the
        /// caller. Callers are then the unique owners of the socket and must close
        /// it once it's no longer needed.
        #[stable(feature = "into_raw_os", since = "1.4.0")]
        fn into_raw_socket(self) -> RawSocket;
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    impl AsRawSocket for net::TcpStream {
        fn as_raw_socket(&self) -> RawSocket {
            *self.as_inner().socket().as_inner()
        }
    }
    #[stable(feature = "rust1", since = "1.0.0")]
    impl AsRawSocket for net::TcpListener {
        fn as_raw_socket(&self) -> RawSocket {
            *self.as_inner().socket().as_inner()
        }
    }
    #[stable(feature = "rust1", since = "1.0.0")]
    impl AsRawSocket for net::UdpSocket {
        fn as_raw_socket(&self) -> RawSocket {
            *self.as_inner().socket().as_inner()
        }
    }

    #[stable(feature = "from_raw_os", since = "1.1.0")]
    impl FromRawSocket for net::TcpStream {
        unsafe fn from_raw_socket(sock: RawSocket) -> net::TcpStream {
            let sock = sys::net::Socket::from_inner(sock);
            net::TcpStream::from_inner(sys_common::net::TcpStream::from_inner(sock))
        }
    }
    #[stable(feature = "from_raw_os", since = "1.1.0")]
    impl FromRawSocket for net::TcpListener {
        unsafe fn from_raw_socket(sock: RawSocket) -> net::TcpListener {
            let sock = sys::net::Socket::from_inner(sock);
            net::TcpListener::from_inner(sys_common::net::TcpListener::from_inner(sock))
        }
    }
    #[stable(feature = "from_raw_os", since = "1.1.0")]
    impl FromRawSocket for net::UdpSocket {
        unsafe fn from_raw_socket(sock: RawSocket) -> net::UdpSocket {
            let sock = sys::net::Socket::from_inner(sock);
            net::UdpSocket::from_inner(sys_common::net::UdpSocket::from_inner(sock))
        }
    }

    #[stable(feature = "into_raw_os", since = "1.4.0")]
    impl IntoRawSocket for net::TcpStream {
        fn into_raw_socket(self) -> RawSocket {
            self.into_inner().into_socket().into_inner()
        }
    }

    #[stable(feature = "into_raw_os", since = "1.4.0")]
    impl IntoRawSocket for net::TcpListener {
        fn into_raw_socket(self) -> RawSocket {
            self.into_inner().into_socket().into_inner()
        }
    }

    #[stable(feature = "into_raw_os", since = "1.4.0")]
    impl IntoRawSocket for net::UdpSocket {
        fn into_raw_socket(self) -> RawSocket {
            self.into_inner().into_socket().into_inner()
        }
    }

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