Function ttydev_leave

freebsd/kern/tty.c:229–268

}

static void
ttydev_leave(struct tty *tp)
{

	tty_assert_locked(tp);

	if (tty_opened(tp) || tp->t_flags & TF_OPENCLOSE) {
		/* Device is still opened somewhere. */
		tty_unlock(tp);
		return;
	}

	tp->t_flags |= TF_OPENCLOSE;

	/* Remove console TTY. */
	if (constty == tp)
		constty_clear();

	/* Drain any output. */
	if (!tty_gone(tp))
		tty_drain(tp, 1);

	ttydisc_close(tp);

	/* Free i/o queues now since they might be large. */
	ttyinq_free(&tp->t_inq);
	tp->t_inlow = 0;
	ttyoutq_free(&tp->t_outq);
	tp->t_outlow = 0;

	knlist_clear(&tp->t_inpoll.si_note, 1);
	knlist_clear(&tp->t_outpoll.si_note, 1);

	if (!tty_gone(tp))
		ttydevsw_close(tp);

	tp->t_flags &= ~TF_OPENCLOSE;
	cv_broadcast(&tp->t_dcdwait);
	tty_rel_free(tp);
}

/*
 * Operations that are exposed through the character device in /dev.