that tty is a ctty.
??? Should getty ensure that other processes which might have opened
-fds to this tty be dusconnected? agetty has a -R option which makes
+fds to this tty be disconnected? agetty has a -R option which makes
agetty call vhangup() after tty is opened. (Then agetty opens it again,
since it probably vhangup'ed its own fd too).