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	tty_wait(struct tty tp, struct cv cv)			tty_wait(struct tty tp, struct cv cv)
	{			{
	int error;			int error;
	int revokecnt = tp->t_revokecnt;			int revokecnt = tp->t_revokecnt;

	tty_lock_assert(tp, MA_OWNED\|MA_NOTRECURSED);			tty_lock_assert(tp, MA_OWNED\|MA_NOTRECURSED);
	MPASS(!tty_gone(tp));			MPASS(!tty_gone(tp));

	error = cv_wait_sig(cv, tp->t_mtx);			error = cv_wait_sig_flags(cv, tp->t_mtx, C_USERWAIT);

	/* Bail out when the device slipped away. */			/* Bail out when the device slipped away. */
	if (tty_gone(tp))			if (tty_gone(tp))
	return (ENXIO);			return (ENXIO);

	/* Restart the system call when we may have been revoked. */			/* Restart the system call when we may have been revoked. */
	if (tp->t_revokecnt != revokecnt)			if (tp->t_revokecnt != revokecnt)
	return (ERESTART);			return (ERESTART);
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