48 unsigned int tty_chars_in_buffer(struct tty_struct *tty)  in tty_chars_in_buffer()  argument
50 	if (tty->ops->chars_in_buffer)  in tty_chars_in_buffer()
51 		return tty->ops->chars_in_buffer(tty);  in tty_chars_in_buffer()
66 unsigned int tty_write_room(struct tty_struct *tty)  in tty_write_room()  argument
68 	if (tty->ops->write_room)  in tty_write_room()
69 		return tty->ops->write_room(tty);  in tty_write_room()
82 void tty_driver_flush_buffer(struct tty_struct *tty)  in tty_driver_flush_buffer()  argument
84 	if (tty->ops->flush_buffer)  in tty_driver_flush_buffer()
85 		tty->ops->flush_buffer(tty);  in tty_driver_flush_buffer()
101 void tty_unthrottle(struct tty_struct *tty)  in tty_unthrottle()  argument
103 	down_write(&tty->termios_rwsem);  in tty_unthrottle()
104 	if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&  in tty_unthrottle()
105 	    tty->ops->unthrottle)  in tty_unthrottle()
106 		tty->ops->unthrottle(tty);  in tty_unthrottle()
107 	tty->flow_change = TTY_FLOW_NO_CHANGE;  in tty_unthrottle()
108 	up_write(&tty->termios_rwsem);  in tty_unthrottle()
123 bool tty_throttle_safe(struct tty_struct *tty)  in tty_throttle_safe()  argument
127 	mutex_lock(&tty->throttle_mutex);  in tty_throttle_safe()
128 	if (!tty_throttled(tty)) {  in tty_throttle_safe()
129 		if (tty->flow_change != TTY_THROTTLE_SAFE)  in tty_throttle_safe()
132 			set_bit(TTY_THROTTLED, &tty->flags);  in tty_throttle_safe()
133 			if (tty->ops->throttle)  in tty_throttle_safe()
134 				tty->ops->throttle(tty);  in tty_throttle_safe()
137 	mutex_unlock(&tty->throttle_mutex);  in tty_throttle_safe()
153 bool tty_unthrottle_safe(struct tty_struct *tty)  in tty_unthrottle_safe()  argument
157 	mutex_lock(&tty->throttle_mutex);  in tty_unthrottle_safe()
158 	if (tty_throttled(tty)) {  in tty_unthrottle_safe()
159 		if (tty->flow_change != TTY_UNTHROTTLE_SAFE)  in tty_unthrottle_safe()
162 			clear_bit(TTY_THROTTLED, &tty->flags);  in tty_unthrottle_safe()
163 			if (tty->ops->unthrottle)  in tty_unthrottle_safe()
164 				tty->ops->unthrottle(tty);  in tty_unthrottle_safe()
167 	mutex_unlock(&tty->throttle_mutex);  in tty_unthrottle_safe()
183 void tty_wait_until_sent(struct tty_struct *tty, long timeout)  in tty_wait_until_sent()  argument
188 	timeout = wait_event_interruptible_timeout(tty->write_wait,  in tty_wait_until_sent()
189 			!tty_chars_in_buffer(tty), timeout);  in tty_wait_until_sent()
196 	if (tty->ops->wait_until_sent)  in tty_wait_until_sent()
197 		tty->ops->wait_until_sent(tty, timeout);  in tty_wait_until_sent()
206 static void unset_locked_termios(struct tty_struct *tty, const struct ktermios *old)  in unset_locked_termios()  argument
208 	struct ktermios *termios = &tty->termios;  in unset_locked_termios()
209 	struct ktermios *locked  = &tty->termios_locked;  in unset_locked_termios()
323 int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)  in tty_set_termios()  argument
328 	WARN_ON(tty->driver->type == TTY_DRIVER_TYPE_PTY &&  in tty_set_termios()
329 		tty->driver->subtype == PTY_TYPE_MASTER);  in tty_set_termios()
337 	down_write(&tty->termios_rwsem);  in tty_set_termios()
338 	old_termios = tty->termios;  in tty_set_termios()
339 	tty->termios = *new_termios;  in tty_set_termios()
340 	unset_locked_termios(tty, &old_termios);  in tty_set_termios()
342 	tty->termios.c_cflag ^= (tty->termios.c_cflag ^ old_termios.c_cflag) & ADDRB;  in tty_set_termios()
344 	if (tty->ops->set_termios)  in tty_set_termios()
345 		tty->ops->set_termios(tty, &old_termios);  in tty_set_termios()
347 		tty_termios_copy_hw(&tty->termios, &old_termios);  in tty_set_termios()
349 	ld = tty_ldisc_ref(tty);  in tty_set_termios()
352 			ld->ops->set_termios(tty, &old_termios);  in tty_set_termios()
355 	up_write(&tty->termios_rwsem);  in tty_set_termios()
448 static int set_termios(struct tty_struct *tty, void __user *arg, int opt)  in set_termios()  argument
452 	int retval = tty_check_change(tty);  in set_termios()
457 	down_read(&tty->termios_rwsem);  in set_termios()
458 	tmp_termios = tty->termios;  in set_termios()
459 	up_read(&tty->termios_rwsem);  in set_termios()
488 		retval = wait_event_interruptible(tty->write_wait, !tty_chars_in_buffer(tty));
492 		if (tty_write_lock(tty, false) < 0)
496 		if (tty_chars_in_buffer(tty)) {
497 			tty_write_unlock(tty);
501 		ld = tty_ldisc_ref(tty);
504 				ld->ops->flush_buffer(tty);
508 		if ((opt & TERMIOS_WAIT) && tty->ops->wait_until_sent) {
509 			tty->ops->wait_until_sent(tty, 0);
511 				tty_write_unlock(tty);
516 		tty_set_termios(tty, &tmp_termios);
518 		tty_write_unlock(tty);
520 		tty_set_termios(tty, &tmp_termios);
530 static void copy_termios(struct tty_struct *tty, struct ktermios *kterm)  in copy_termios()  argument
532 	down_read(&tty->termios_rwsem);  in copy_termios()
533 	*kterm = tty->termios;  in copy_termios()
534 	up_read(&tty->termios_rwsem);  in copy_termios()
537 static void copy_termios_locked(struct tty_struct *tty, struct ktermios *kterm)  in copy_termios_locked()  argument
539 	down_read(&tty->termios_rwsem);  in copy_termios_locked()
540 	*kterm = tty->termios_locked;  in copy_termios_locked()
541 	up_read(&tty->termios_rwsem);  in copy_termios_locked()
544 static int get_termio(struct tty_struct *tty, struct termio __user *termio)  in get_termio()  argument
547 	copy_termios(tty, &kterm);  in get_termio()
559 static int get_sgflags(struct tty_struct *tty)  in get_sgflags()  argument
563 	if (!L_ICANON(tty)) {  in get_sgflags()
564 		if (L_ISIG(tty))  in get_sgflags()
569 	if (L_ECHO(tty))  in get_sgflags()
571 	if (O_OPOST(tty))  in get_sgflags()
572 		if (O_ONLCR(tty))  in get_sgflags()
577 static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)  in get_sgttyb()  argument
581 	down_read(&tty->termios_rwsem);  in get_sgttyb()
582 	tmp.sg_ispeed = tty->termios.c_ispeed;  in get_sgttyb()
583 	tmp.sg_ospeed = tty->termios.c_ospeed;  in get_sgttyb()
584 	tmp.sg_erase = tty->termios.c_cc[VERASE];  in get_sgttyb()
585 	tmp.sg_kill = tty->termios.c_cc[VKILL];  in get_sgttyb()
586 	tmp.sg_flags = get_sgflags(tty);  in get_sgttyb()
587 	up_read(&tty->termios_rwsem);  in get_sgttyb()
629 static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)  in set_sgttyb()  argument
635 	retval = tty_check_change(tty);  in set_sgttyb()
642 	down_write(&tty->termios_rwsem);  in set_sgttyb()
643 	termios = tty->termios;  in set_sgttyb()
650 	up_write(&tty->termios_rwsem);  in set_sgttyb()
651 	tty_set_termios(tty, &termios);  in set_sgttyb()
657 static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars)  in get_tchars()  argument
661 	down_read(&tty->termios_rwsem);  in get_tchars()
662 	tmp.t_intrc = tty->termios.c_cc[VINTR];  in get_tchars()
663 	tmp.t_quitc = tty->termios.c_cc[VQUIT];  in get_tchars()
664 	tmp.t_startc = tty->termios.c_cc[VSTART];  in get_tchars()
665 	tmp.t_stopc = tty->termios.c_cc[VSTOP];  in get_tchars()
666 	tmp.t_eofc = tty->termios.c_cc[VEOF];  in get_tchars()
667 	tmp.t_brkc = tty->termios.c_cc[VEOL2];	/* what is brkc anyway? */  in get_tchars()
668 	up_read(&tty->termios_rwsem);  in get_tchars()
672 static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars)  in set_tchars()  argument
678 	down_write(&tty->termios_rwsem);  in set_tchars()
679 	tty->termios.c_cc[VINTR] = tmp.t_intrc;  in set_tchars()
680 	tty->termios.c_cc[VQUIT] = tmp.t_quitc;  in set_tchars()
681 	tty->termios.c_cc[VSTART] = tmp.t_startc;  in set_tchars()
682 	tty->termios.c_cc[VSTOP] = tmp.t_stopc;  in set_tchars()
683 	tty->termios.c_cc[VEOF] = tmp.t_eofc;  in set_tchars()
684 	tty->termios.c_cc[VEOL2] = tmp.t_brkc;	/* what is brkc anyway? */  in set_tchars()
685 	up_write(&tty->termios_rwsem);  in set_tchars()
691 static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)  in get_ltchars()  argument
695 	down_read(&tty->termios_rwsem);  in get_ltchars()
696 	tmp.t_suspc = tty->termios.c_cc[VSUSP];  in get_ltchars()
698 	tmp.t_dsuspc = tty->termios.c_cc[VSUSP];  in get_ltchars()
699 	tmp.t_rprntc = tty->termios.c_cc[VREPRINT];  in get_ltchars()
701 	tmp.t_flushc = tty->termios.c_cc[VEOL2];  in get_ltchars()
702 	tmp.t_werasc = tty->termios.c_cc[VWERASE];  in get_ltchars()
703 	tmp.t_lnextc = tty->termios.c_cc[VLNEXT];  in get_ltchars()
704 	up_read(&tty->termios_rwsem);  in get_ltchars()
708 static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)  in set_ltchars()  argument
715 	down_write(&tty->termios_rwsem);  in set_ltchars()
716 	tty->termios.c_cc[VSUSP] = tmp.t_suspc;  in set_ltchars()
718 	tty->termios.c_cc[VEOL2] = tmp.t_dsuspc;  in set_ltchars()
719 	tty->termios.c_cc[VREPRINT] = tmp.t_rprntc;  in set_ltchars()
721 	tty->termios.c_cc[VEOL2] = tmp.t_flushc;  in set_ltchars()
722 	tty->termios.c_cc[VWERASE] = tmp.t_werasc;  in set_ltchars()
723 	tty->termios.c_cc[VLNEXT] = tmp.t_lnextc;  in set_ltchars()
724 	up_write(&tty->termios_rwsem);  in set_ltchars()
741 static int tty_change_softcar(struct tty_struct *tty, bool enable)  in tty_change_softcar()  argument
747 	down_write(&tty->termios_rwsem);  in tty_change_softcar()
748 	old = tty->termios;  in tty_change_softcar()
749 	tty->termios.c_cflag &= ~CLOCAL;  in tty_change_softcar()
750 	tty->termios.c_cflag |= bit;  in tty_change_softcar()
751 	if (tty->ops->set_termios)  in tty_change_softcar()
752 		tty->ops->set_termios(tty, &old);  in tty_change_softcar()
753 	if (C_CLOCAL(tty) != bit)  in tty_change_softcar()
755 	up_write(&tty->termios_rwsem);  in tty_change_softcar()
769 int tty_mode_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)  in tty_mode_ioctl()  argument
776 	if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&  in tty_mode_ioctl()
777 	    tty->driver->subtype == PTY_TYPE_MASTER)  in tty_mode_ioctl()
778 		real_tty = tty->link;  in tty_mode_ioctl()
780 		real_tty = tty;  in tty_mode_ioctl()
899 static int __tty_perform_flush(struct tty_struct *tty, unsigned long arg)  in __tty_perform_flush()  argument
901 	struct tty_ldisc *ld = tty->ldisc;  in __tty_perform_flush()
906 			ld->ops->flush_buffer(tty);  in __tty_perform_flush()
907 			tty_unthrottle(tty);  in __tty_perform_flush()
912 			ld->ops->flush_buffer(tty);  in __tty_perform_flush()
913 			tty_unthrottle(tty);  in __tty_perform_flush()
917 		tty_driver_flush_buffer(tty);  in __tty_perform_flush()
925 int tty_perform_flush(struct tty_struct *tty, unsigned long arg)  in tty_perform_flush()  argument
928 	int retval = tty_check_change(tty);  in tty_perform_flush()
932 	ld = tty_ldisc_ref_wait(tty);  in tty_perform_flush()
933 	retval = __tty_perform_flush(tty, arg);  in tty_perform_flush()
940 int n_tty_ioctl_helper(struct tty_struct *tty, unsigned int cmd,  in n_tty_ioctl_helper()  argument
947 		retval = tty_check_change(tty);  in n_tty_ioctl_helper()
952 			spin_lock_irq(&tty->flow.lock);  in n_tty_ioctl_helper()
953 			if (!tty->flow.tco_stopped) {  in n_tty_ioctl_helper()
954 				tty->flow.tco_stopped = true;  in n_tty_ioctl_helper()
955 				__stop_tty(tty);  in n_tty_ioctl_helper()
957 			spin_unlock_irq(&tty->flow.lock);  in n_tty_ioctl_helper()
960 			spin_lock_irq(&tty->flow.lock);  in n_tty_ioctl_helper()
961 			if (tty->flow.tco_stopped) {  in n_tty_ioctl_helper()
962 				tty->flow.tco_stopped = false;  in n_tty_ioctl_helper()
963 				__start_tty(tty);  in n_tty_ioctl_helper()
965 			spin_unlock_irq(&tty->flow.lock);  in n_tty_ioctl_helper()
968 			if (STOP_CHAR(tty) != __DISABLED_CHAR)  in n_tty_ioctl_helper()
969 				retval = tty_send_xchar(tty, STOP_CHAR(tty));  in n_tty_ioctl_helper()
972 			if (START_CHAR(tty) != __DISABLED_CHAR)  in n_tty_ioctl_helper()
973 				retval = tty_send_xchar(tty, START_CHAR(tty));  in n_tty_ioctl_helper()
980 		retval = tty_check_change(tty);  in n_tty_ioctl_helper()
983 		return __tty_perform_flush(tty, arg);  in n_tty_ioctl_helper()
986 		return tty_mode_ioctl(tty, cmd, arg);  in n_tty_ioctl_helper()