1 files changed, 22 insertions, 0 deletions
diff --git a/third_party/rust/termion/src/sys/redox/tty.rs b/third_party/rust/termion/src/sys/redox/tty.rs
new file mode 100644
index 0000000000..9179b39625
--- /dev/null
+++ b/third_party/rust/termion/src/sys/redox/tty.rs
@@ -0,0 +1,22 @@
+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)
+}