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use std::{env, fs, io};
use std::os::unix::io::AsRawFd;
use super::syscall;
/// Is this stream a TTY?
pub fn is_tty<T: AsRawFd>(stream: &T) -> bool {
if let Ok(fd) = syscall::dup(stream.as_raw_fd(), b"termios") {
let _ = syscall::close(fd);
true
} else {
false
}
}
/// Get the TTY device.
///
/// This allows for getting stdio representing _only_ the TTY, and not other streams.
pub fn get_tty() -> io::Result<fs::File> {
let tty = try!(env::var("TTY").map_err(|x| io::Error::new(io::ErrorKind::NotFound, x)));
fs::OpenOptions::new().read(true).write(true).open(tty)
}
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