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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.

    //! Unix-specific extensions to primitives in the `std::process` module.

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

    use os::unix::raw::{uid_t, gid_t};
    use os::unix::io::{FromRawFd, RawFd, AsRawFd, IntoRawFd};
    use process;
    use sys;
    use sys_common::{AsInnerMut, AsInner, FromInner, IntoInner};

    /// Unix-specific extensions to the `std::process::Command` builder
    #[stable(feature = "rust1", since = "1.0.0")]
    pub trait CommandExt {
        /// Sets the child process's user id. This translates to a
        /// `setuid` call in the child process. Failure in the `setuid`
        /// call will cause the spawn to fail.
        #[stable(feature = "rust1", since = "1.0.0")]
        fn uid(&mut self, id: uid_t) -> &mut process::Command;

        /// Similar to `uid`, but sets the group id of the child process. This has
        /// the same semantics as the `uid` field.
        #[stable(feature = "rust1", since = "1.0.0")]
        fn gid(&mut self, id: gid_t) -> &mut process::Command;

        /// Create a new session (cf. `setsid(2)`) for the child process. This means
        /// that the child is the leader of a new process group. The parent process
        /// remains the child reaper of the new process.
        ///
        /// This is not enough to create a daemon process. The *init* process should
        /// be the child reaper of a daemon. This can be achieved if the parent
        /// process exit. Moreover, a daemon should not have a controlling terminal.
        /// To achieve this, a session leader (the child) must spawn another process
        /// (the daemon) in the same session.
        #[unstable(feature = "process_session_leader", reason = "recently added",
                   issue = "27811")]
        fn session_leader(&mut self, on: bool) -> &mut process::Command;
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    impl CommandExt for process::Command {
        fn uid(&mut self, id: uid_t) -> &mut process::Command {
            self.as_inner_mut().uid = Some(id);
            self
        }

        fn gid(&mut self, id: gid_t) -> &mut process::Command {
            self.as_inner_mut().gid = Some(id);
            self
        }

        fn session_leader(&mut self, on: bool) -> &mut process::Command {
            self.as_inner_mut().session_leader = on;
            self
        }
    }

    /// Unix-specific extensions to `std::process::ExitStatus`
    #[stable(feature = "rust1", since = "1.0.0")]
    pub trait ExitStatusExt {
        /// If the process was terminated by a signal, returns that signal.
        #[stable(feature = "rust1", since = "1.0.0")]
        fn signal(&self) -> Option<i32>;
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    impl ExitStatusExt for process::ExitStatus {
        fn signal(&self) -> Option<i32> {
            self.as_inner().signal()
        }
    }

    #[stable(feature = "process_extensions", since = "1.2.0")]
    impl FromRawFd for process::Stdio {
        unsafe fn from_raw_fd(fd: RawFd) -> process::Stdio {
            process::Stdio::from_inner(sys::fd::FileDesc::new(fd))
        }
    }

    #[stable(feature = "process_extensions", since = "1.2.0")]
    impl AsRawFd for process::ChildStdin {
        fn as_raw_fd(&self) -> RawFd {
            self.as_inner().fd().raw()
        }
    }

    #[stable(feature = "process_extensions", since = "1.2.0")]
    impl AsRawFd for process::ChildStdout {
        fn as_raw_fd(&self) -> RawFd {
            self.as_inner().fd().raw()
        }
    }

    #[stable(feature = "process_extensions", since = "1.2.0")]
    impl AsRawFd for process::ChildStderr {
        fn as_raw_fd(&self) -> RawFd {
            self.as_inner().fd().raw()
        }
    }

    #[stable(feature = "process_extensions", since = "1.2.0")]
    impl IntoRawFd for process::ChildStdin {
        fn into_raw_fd(self) -> RawFd {
            self.into_inner().into_fd().into_raw()
        }
    }

    #[stable(feature = "process_extensions", since = "1.2.0")]
    impl IntoRawFd for process::ChildStdout {
        fn into_raw_fd(self) -> RawFd {
            self.into_inner().into_fd().into_raw()
        }
    }

    #[stable(feature = "process_extensions", since = "1.2.0")]
    impl IntoRawFd for process::ChildStderr {
        fn into_raw_fd(self) -> RawFd {
            self.into_inner().into_fd().into_raw()
        }
    }

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