33 # define tty_debug_wait_until_sent(tty, f, args...)    tty_debug(tty, f, ##args)  argument
35 # define tty_debug_wait_until_sent(tty, f, args...)    do {} while (0)  argument
58 unsigned int tty_chars_in_buffer(struct tty_struct *tty)  in tty_chars_in_buffer()  argument
60 	if (tty->ops->chars_in_buffer)  in tty_chars_in_buffer()
61 		return tty->ops->chars_in_buffer(tty);  in tty_chars_in_buffer()
77 unsigned int tty_write_room(struct tty_struct *tty)  in tty_write_room()  argument
79 	if (tty->ops->write_room)  in tty_write_room()
80 		return tty->ops->write_room(tty);  in tty_write_room()
93 void tty_driver_flush_buffer(struct tty_struct *tty)  in tty_driver_flush_buffer()  argument
95 	if (tty->ops->flush_buffer)  in tty_driver_flush_buffer()
96 		tty->ops->flush_buffer(tty);  in tty_driver_flush_buffer()
113 void tty_unthrottle(struct tty_struct *tty)  in tty_unthrottle()  argument
115 	down_write(&tty->termios_rwsem);  in tty_unthrottle()
116 	if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&  in tty_unthrottle()
117 	    tty->ops->unthrottle)  in tty_unthrottle()
118 		tty->ops->unthrottle(tty);  in tty_unthrottle()
119 	tty->flow_change = 0;  in tty_unthrottle()
120 	up_write(&tty->termios_rwsem);  in tty_unthrottle()
137 int tty_throttle_safe(struct tty_struct *tty)  in tty_throttle_safe()  argument
141 	mutex_lock(&tty->throttle_mutex);  in tty_throttle_safe()
142 	if (!tty_throttled(tty)) {  in tty_throttle_safe()
143 		if (tty->flow_change != TTY_THROTTLE_SAFE)  in tty_throttle_safe()
146 			set_bit(TTY_THROTTLED, &tty->flags);  in tty_throttle_safe()
147 			if (tty->ops->throttle)  in tty_throttle_safe()
148 				tty->ops->throttle(tty);  in tty_throttle_safe()
151 	mutex_unlock(&tty->throttle_mutex);  in tty_throttle_safe()
168 int tty_unthrottle_safe(struct tty_struct *tty)  in tty_unthrottle_safe()  argument
172 	mutex_lock(&tty->throttle_mutex);  in tty_unthrottle_safe()
173 	if (tty_throttled(tty)) {  in tty_unthrottle_safe()
174 		if (tty->flow_change != TTY_UNTHROTTLE_SAFE)  in tty_unthrottle_safe()
177 			clear_bit(TTY_THROTTLED, &tty->flags);  in tty_unthrottle_safe()
178 			if (tty->ops->unthrottle)  in tty_unthrottle_safe()
179 				tty->ops->unthrottle(tty);  in tty_unthrottle_safe()
182 	mutex_unlock(&tty->throttle_mutex);  in tty_unthrottle_safe()
198 void tty_wait_until_sent(struct tty_struct *tty, long timeout)  in tty_wait_until_sent()  argument
200 	tty_debug_wait_until_sent(tty, "wait until sent, timeout=%ld\n", timeout);  in tty_wait_until_sent()
205 	timeout = wait_event_interruptible_timeout(tty->write_wait,  in tty_wait_until_sent()
206 			!tty_chars_in_buffer(tty), timeout);  in tty_wait_until_sent()
213 	if (tty->ops->wait_until_sent)  in tty_wait_until_sent()
214 		tty->ops->wait_until_sent(tty, timeout);  in tty_wait_until_sent()
223 static void unset_locked_termios(struct tty_struct *tty, const struct ktermios *old)  in unset_locked_termios()  argument
225 	struct ktermios *termios = &tty->termios;  in unset_locked_termios()
226 	struct ktermios *locked  = &tty->termios_locked;  in unset_locked_termios()
341 int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)  in tty_set_termios()  argument
346 	WARN_ON(tty->driver->type == TTY_DRIVER_TYPE_PTY &&  in tty_set_termios()
347 		tty->driver->subtype == PTY_TYPE_MASTER);  in tty_set_termios()
355 	down_write(&tty->termios_rwsem);  in tty_set_termios()
356 	old_termios = tty->termios;  in tty_set_termios()
357 	tty->termios = *new_termios;  in tty_set_termios()
358 	unset_locked_termios(tty, &old_termios);  in tty_set_termios()
360 	tty->termios.c_cflag ^= (tty->termios.c_cflag ^ old_termios.c_cflag) & ADDRB;  in tty_set_termios()
362 	if (tty->ops->set_termios)  in tty_set_termios()
363 		tty->ops->set_termios(tty, &old_termios);  in tty_set_termios()
365 		tty_termios_copy_hw(&tty->termios, &old_termios);  in tty_set_termios()
367 	ld = tty_ldisc_ref(tty);  in tty_set_termios()
370 			ld->ops->set_termios(tty, &old_termios);  in tty_set_termios()
373 	up_write(&tty->termios_rwsem);  in tty_set_termios()
465 static int set_termios(struct tty_struct *tty, void __user *arg, int opt)  in set_termios()  argument
469 	int retval = tty_check_change(tty);  in set_termios()
474 	down_read(&tty->termios_rwsem);  in set_termios()
475 	tmp_termios = tty->termios;  in set_termios()
476 	up_read(&tty->termios_rwsem);  in set_termios()
503 	ld = tty_ldisc_ref(tty);
507 			ld->ops->flush_buffer(tty);
512 		tty_wait_until_sent(tty, 0);
517 	tty_set_termios(tty, &tmp_termios);
526 static void copy_termios(struct tty_struct *tty, struct ktermios *kterm)  in copy_termios()  argument
528 	down_read(&tty->termios_rwsem);  in copy_termios()
529 	*kterm = tty->termios;  in copy_termios()
530 	up_read(&tty->termios_rwsem);  in copy_termios()
533 static void copy_termios_locked(struct tty_struct *tty, struct ktermios *kterm)  in copy_termios_locked()  argument
535 	down_read(&tty->termios_rwsem);  in copy_termios_locked()
536 	*kterm = tty->termios_locked;  in copy_termios_locked()
537 	up_read(&tty->termios_rwsem);  in copy_termios_locked()
540 static int get_termio(struct tty_struct *tty, struct termio __user *termio)  in get_termio()  argument
543 	copy_termios(tty, &kterm);  in get_termio()
555 static int get_sgflags(struct tty_struct *tty)  in get_sgflags()  argument
559 	if (!L_ICANON(tty)) {  in get_sgflags()
560 		if (L_ISIG(tty))  in get_sgflags()
565 	if (L_ECHO(tty))  in get_sgflags()
567 	if (O_OPOST(tty))  in get_sgflags()
568 		if (O_ONLCR(tty))  in get_sgflags()
573 static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)  in get_sgttyb()  argument
577 	down_read(&tty->termios_rwsem);  in get_sgttyb()
578 	tmp.sg_ispeed = tty->termios.c_ispeed;  in get_sgttyb()
579 	tmp.sg_ospeed = tty->termios.c_ospeed;  in get_sgttyb()
580 	tmp.sg_erase = tty->termios.c_cc[VERASE];  in get_sgttyb()
581 	tmp.sg_kill = tty->termios.c_cc[VKILL];  in get_sgttyb()
582 	tmp.sg_flags = get_sgflags(tty);  in get_sgttyb()
583 	up_read(&tty->termios_rwsem);  in get_sgttyb()
625 static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)  in set_sgttyb()  argument
631 	retval = tty_check_change(tty);  in set_sgttyb()
638 	down_write(&tty->termios_rwsem);  in set_sgttyb()
639 	termios = tty->termios;  in set_sgttyb()
646 	up_write(&tty->termios_rwsem);  in set_sgttyb()
647 	tty_set_termios(tty, &termios);  in set_sgttyb()
653 static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars)  in get_tchars()  argument
657 	down_read(&tty->termios_rwsem);  in get_tchars()
658 	tmp.t_intrc = tty->termios.c_cc[VINTR];  in get_tchars()
659 	tmp.t_quitc = tty->termios.c_cc[VQUIT];  in get_tchars()
660 	tmp.t_startc = tty->termios.c_cc[VSTART];  in get_tchars()
661 	tmp.t_stopc = tty->termios.c_cc[VSTOP];  in get_tchars()
662 	tmp.t_eofc = tty->termios.c_cc[VEOF];  in get_tchars()
663 	tmp.t_brkc = tty->termios.c_cc[VEOL2];	/* what is brkc anyway? */  in get_tchars()
664 	up_read(&tty->termios_rwsem);  in get_tchars()
668 static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars)  in set_tchars()  argument
674 	down_write(&tty->termios_rwsem);  in set_tchars()
675 	tty->termios.c_cc[VINTR] = tmp.t_intrc;  in set_tchars()
676 	tty->termios.c_cc[VQUIT] = tmp.t_quitc;  in set_tchars()
677 	tty->termios.c_cc[VSTART] = tmp.t_startc;  in set_tchars()
678 	tty->termios.c_cc[VSTOP] = tmp.t_stopc;  in set_tchars()
679 	tty->termios.c_cc[VEOF] = tmp.t_eofc;  in set_tchars()
680 	tty->termios.c_cc[VEOL2] = tmp.t_brkc;	/* what is brkc anyway? */  in set_tchars()
681 	up_write(&tty->termios_rwsem);  in set_tchars()
687 static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)  in get_ltchars()  argument
691 	down_read(&tty->termios_rwsem);  in get_ltchars()
692 	tmp.t_suspc = tty->termios.c_cc[VSUSP];  in get_ltchars()
694 	tmp.t_dsuspc = tty->termios.c_cc[VSUSP];  in get_ltchars()
695 	tmp.t_rprntc = tty->termios.c_cc[VREPRINT];  in get_ltchars()
697 	tmp.t_flushc = tty->termios.c_cc[VEOL2];  in get_ltchars()
698 	tmp.t_werasc = tty->termios.c_cc[VWERASE];  in get_ltchars()
699 	tmp.t_lnextc = tty->termios.c_cc[VLNEXT];  in get_ltchars()
700 	up_read(&tty->termios_rwsem);  in get_ltchars()
704 static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)  in set_ltchars()  argument
711 	down_write(&tty->termios_rwsem);  in set_ltchars()
712 	tty->termios.c_cc[VSUSP] = tmp.t_suspc;  in set_ltchars()
714 	tty->termios.c_cc[VEOL2] = tmp.t_dsuspc;  in set_ltchars()
715 	tty->termios.c_cc[VREPRINT] = tmp.t_rprntc;  in set_ltchars()
717 	tty->termios.c_cc[VEOL2] = tmp.t_flushc;  in set_ltchars()
718 	tty->termios.c_cc[VWERASE] = tmp.t_werasc;  in set_ltchars()
719 	tty->termios.c_cc[VLNEXT] = tmp.t_lnextc;  in set_ltchars()
720 	up_write(&tty->termios_rwsem);  in set_ltchars()
734 static int tty_change_softcar(struct tty_struct *tty, int arg)  in tty_change_softcar()  argument
740 	down_write(&tty->termios_rwsem);  in tty_change_softcar()
741 	old = tty->termios;  in tty_change_softcar()
742 	tty->termios.c_cflag &= ~CLOCAL;  in tty_change_softcar()
743 	tty->termios.c_cflag |= bit;  in tty_change_softcar()
744 	if (tty->ops->set_termios)  in tty_change_softcar()
745 		tty->ops->set_termios(tty, &old);  in tty_change_softcar()
746 	if (C_CLOCAL(tty) != bit)  in tty_change_softcar()
748 	up_write(&tty->termios_rwsem);  in tty_change_softcar()
763 int tty_mode_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)  in tty_mode_ioctl()  argument
770 	if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&  in tty_mode_ioctl()
771 	    tty->driver->subtype == PTY_TYPE_MASTER)  in tty_mode_ioctl()
772 		real_tty = tty->link;  in tty_mode_ioctl()
774 		real_tty = tty;  in tty_mode_ioctl()
893 static int __tty_perform_flush(struct tty_struct *tty, unsigned long arg)  in __tty_perform_flush()  argument
895 	struct tty_ldisc *ld = tty->ldisc;  in __tty_perform_flush()
900 			ld->ops->flush_buffer(tty);  in __tty_perform_flush()
901 			tty_unthrottle(tty);  in __tty_perform_flush()
906 			ld->ops->flush_buffer(tty);  in __tty_perform_flush()
907 			tty_unthrottle(tty);  in __tty_perform_flush()
911 		tty_driver_flush_buffer(tty);  in __tty_perform_flush()
919 int tty_perform_flush(struct tty_struct *tty, unsigned long arg)  in tty_perform_flush()  argument
922 	int retval = tty_check_change(tty);  in tty_perform_flush()
926 	ld = tty_ldisc_ref_wait(tty);  in tty_perform_flush()
927 	retval = __tty_perform_flush(tty, arg);  in tty_perform_flush()
934 int n_tty_ioctl_helper(struct tty_struct *tty, unsigned int cmd,  in n_tty_ioctl_helper()  argument
941 		retval = tty_check_change(tty);  in n_tty_ioctl_helper()
946 			spin_lock_irq(&tty->flow.lock);  in n_tty_ioctl_helper()
947 			if (!tty->flow.tco_stopped) {  in n_tty_ioctl_helper()
948 				tty->flow.tco_stopped = true;  in n_tty_ioctl_helper()
949 				__stop_tty(tty);  in n_tty_ioctl_helper()
951 			spin_unlock_irq(&tty->flow.lock);  in n_tty_ioctl_helper()
954 			spin_lock_irq(&tty->flow.lock);  in n_tty_ioctl_helper()
955 			if (tty->flow.tco_stopped) {  in n_tty_ioctl_helper()
956 				tty->flow.tco_stopped = false;  in n_tty_ioctl_helper()
957 				__start_tty(tty);  in n_tty_ioctl_helper()
959 			spin_unlock_irq(&tty->flow.lock);  in n_tty_ioctl_helper()
962 			if (STOP_CHAR(tty) != __DISABLED_CHAR)  in n_tty_ioctl_helper()
963 				retval = tty_send_xchar(tty, STOP_CHAR(tty));  in n_tty_ioctl_helper()
966 			if (START_CHAR(tty) != __DISABLED_CHAR)  in n_tty_ioctl_helper()
967 				retval = tty_send_xchar(tty, START_CHAR(tty));  in n_tty_ioctl_helper()
974 		retval = tty_check_change(tty);  in n_tty_ioctl_helper()
977 		return __tty_perform_flush(tty, arg);  in n_tty_ioctl_helper()
980 		return tty_mode_ioctl(tty, cmd, arg);  in n_tty_ioctl_helper()