io::ioctl!

macro_rules! ioctl {
    () => ({
        extern crate io;
        let mut term = Box::new(io::ffi::Termios {
            c_iflag: 0,
            c_oflag: 0,
            c_cflag: 0,
            c_lflag: 0,
            c_line: 0,
            c_cc: [0; io::ffi::NCCS],
            c_ispeed: 0,
            c_ospeed: 0,
        });

        ioctl!(io::ffi::TermiosControl::GETA, &mut *term);
        term

    });
    ($control: expr) => ({
        let mut term = ioctl!();

        term.c_lflag = $control;
        term
    });
    ($req: expr, $term: expr) => ({
        extern crate io;
        unsafe {
            io::ffi::ioctl (
                io::ffi::STDIN_FILENO,
                $req as u64,
                $term,
           )
        }
    });
}

The ioctl macro reads the input and returns None or a tuple (len, text).