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    use crate::io;
    use crate::sys::fd::FileDesc;

    pub struct Stdin(());
    pub struct Stdout(());
    pub struct Stderr(());

    impl Stdin {
        pub fn new() -> io::Result<Stdin> { Ok(Stdin(())) }
    }

    impl io::Read for Stdin {
        fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
            let fd = FileDesc::new(libc::STDIN_FILENO);
            let ret = fd.read(buf);
            fd.into_raw(); // do not close this FD
            ret
        }
    }

    impl Stdout {
        pub fn new() -> io::Result<Stdout> { Ok(Stdout(())) }
    }

    impl io::Write for Stdout {
        fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
            let fd = FileDesc::new(libc::STDOUT_FILENO);
            let ret = fd.write(buf);
            fd.into_raw(); // do not close this FD
            ret
        }

        fn flush(&mut self) -> io::Result<()> {
            Ok(())
        }
    }

    impl Stderr {
        pub fn new() -> io::Result<Stderr> { Ok(Stderr(())) }
    }

    impl io::Write for Stderr {
        fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
            let fd = FileDesc::new(libc::STDERR_FILENO);
            let ret = fd.write(buf);
            fd.into_raw(); // do not close this FD
            ret
        }

        fn flush(&mut self) -> io::Result<()> {
            Ok(())
        }
    }

    pub fn is_ebadf(err: &io::Error) -> bool {
        err.raw_os_error() == Some(libc::EBADF as i32)
    }

    pub const STDIN_BUF_SIZE: usize = crate::sys_common::io::DEFAULT_BUF_SIZE;

    pub fn panic_output() -> Option<impl io::Write> {
        Stderr::new().ok()
    }

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