getty: temporary diag — log input forwarded from tty to pty

src/bin/getty.rs

@@ -67,6 +67,7 @@ pub fn handle(
                     Err(ref err) if err.errno() == EAGAIN => break,
                     Err(_) => panic!("getty: failed to read from TTY"),
                 };
+                eprintln!("getty-diag: fwd {count} bytes tty->pty {:?}", &packet[..count.min(24)]);
                 redox::write(master_fd as usize, &packet[..count])
                     .expect("getty: failed to write master PTY");
             }