51 unsigned int tty_chars_in_buffer(struct tty_struct *tty)  in tty_chars_in_buffer()  argument
53 	if (tty->ops->chars_in_buffer)  in tty_chars_in_buffer()
54 		return tty->ops->chars_in_buffer(tty);  in tty_chars_in_buffer()
70 unsigned int tty_write_room(struct tty_struct *tty)  in tty_write_room()  argument
72 	if (tty->ops->write_room)  in tty_write_room()
73 		return tty->ops->write_room(tty);  in tty_write_room()
86 void tty_driver_flush_buffer(struct tty_struct *tty)  in tty_driver_flush_buffer()  argument
88 	if (tty->ops->flush_buffer)  in tty_driver_flush_buffer()
89 		tty->ops->flush_buffer(tty);  in tty_driver_flush_buffer()
106 void tty_unthrottle(struct tty_struct *tty)  in tty_unthrottle()  argument
108 	down_write(&tty->termios_rwsem);  in tty_unthrottle()
109 	if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&  in tty_unthrottle()
110 	    tty->ops->unthrottle)  in tty_unthrottle()
111 		tty->ops->unthrottle(tty);  in tty_unthrottle()
112 	tty->flow_change = 0;  in tty_unthrottle()
113 	up_write(&tty->termios_rwsem);  in tty_unthrottle()
130 int tty_throttle_safe(struct tty_struct *tty)  in tty_throttle_safe()  argument
134 	mutex_lock(&tty->throttle_mutex);  in tty_throttle_safe()
135 	if (!tty_throttled(tty)) {  in tty_throttle_safe()
136 		if (tty->flow_change != TTY_THROTTLE_SAFE)  in tty_throttle_safe()
139 			set_bit(TTY_THROTTLED, &tty->flags);  in tty_throttle_safe()
140 			if (tty->ops->throttle)  in tty_throttle_safe()
141 				tty->ops->throttle(tty);  in tty_throttle_safe()
144 	mutex_unlock(&tty->throttle_mutex);  in tty_throttle_safe()
161 int tty_unthrottle_safe(struct tty_struct *tty)  in tty_unthrottle_safe()  argument
165 	mutex_lock(&tty->throttle_mutex);  in tty_unthrottle_safe()
166 	if (tty_throttled(tty)) {  in tty_unthrottle_safe()
167 		if (tty->flow_change != TTY_UNTHROTTLE_SAFE)  in tty_unthrottle_safe()
170 			clear_bit(TTY_THROTTLED, &tty->flags);  in tty_unthrottle_safe()
171 			if (tty->ops->unthrottle)  in tty_unthrottle_safe()
172 				tty->ops->unthrottle(tty);  in tty_unthrottle_safe()
175 	mutex_unlock(&tty->throttle_mutex);  in tty_unthrottle_safe()
191 void tty_wait_until_sent(struct tty_struct *tty, long timeout)  in tty_wait_until_sent()  argument
196 	timeout = wait_event_interruptible_timeout(tty->write_wait,  in tty_wait_until_sent()
197 			!tty_chars_in_buffer(tty), timeout);  in tty_wait_until_sent()
204 	if (tty->ops->wait_until_sent)  in tty_wait_until_sent()
205 		tty->ops->wait_until_sent(tty, timeout);  in tty_wait_until_sent()
214 static void unset_locked_termios(struct tty_struct *tty, const struct ktermios *old)  in unset_locked_termios()  argument
216 	struct ktermios *termios = &tty->termios;  in unset_locked_termios()
217 	struct ktermios *locked  = &tty->termios_locked;  in unset_locked_termios()
332 int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)  in tty_set_termios()  argument
337 	WARN_ON(tty->driver->type == TTY_DRIVER_TYPE_PTY &&  in tty_set_termios()
338 		tty->driver->subtype == PTY_TYPE_MASTER);  in tty_set_termios()
346 	down_write(&tty->termios_rwsem);  in tty_set_termios()
347 	old_termios = tty->termios;  in tty_set_termios()
348 	tty->termios = *new_termios;  in tty_set_termios()
349 	unset_locked_termios(tty, &old_termios);  in tty_set_termios()
351 	tty->termios.c_cflag ^= (tty->termios.c_cflag ^ old_termios.c_cflag) & ADDRB;  in tty_set_termios()
353 	if (tty->ops->set_termios)  in tty_set_termios()
354 		tty->ops->set_termios(tty, &old_termios);  in tty_set_termios()
356 		tty_termios_copy_hw(&tty->termios, &old_termios);  in tty_set_termios()
358 	ld = tty_ldisc_ref(tty);  in tty_set_termios()
361 			ld->ops->set_termios(tty, &old_termios);  in tty_set_termios()
364 	up_write(&tty->termios_rwsem);  in tty_set_termios()
456 static int set_termios(struct tty_struct *tty, void __user *arg, int opt)  in set_termios()  argument
460 	int retval = tty_check_change(tty);  in set_termios()
465 	down_read(&tty->termios_rwsem);  in set_termios()
466 	tmp_termios = tty->termios;  in set_termios()
467 	up_read(&tty->termios_rwsem);  in set_termios()
496 		retval = wait_event_interruptible(tty->write_wait, !tty_chars_in_buffer(tty));
500 		if (tty_write_lock(tty, false) < 0)
504 		if (tty_chars_in_buffer(tty)) {
505 			tty_write_unlock(tty);
509 		ld = tty_ldisc_ref(tty);
512 				ld->ops->flush_buffer(tty);
516 		if ((opt & TERMIOS_WAIT) && tty->ops->wait_until_sent) {
517 			tty->ops->wait_until_sent(tty, 0);
519 				tty_write_unlock(tty);
524 		tty_set_termios(tty, &tmp_termios);
526 		tty_write_unlock(tty);
528 		tty_set_termios(tty, &tmp_termios);
538 static void copy_termios(struct tty_struct *tty, struct ktermios *kterm)  in copy_termios()  argument
540 	down_read(&tty->termios_rwsem);  in copy_termios()
541 	*kterm = tty->termios;  in copy_termios()
542 	up_read(&tty->termios_rwsem);  in copy_termios()
545 static void copy_termios_locked(struct tty_struct *tty, struct ktermios *kterm)  in copy_termios_locked()  argument
547 	down_read(&tty->termios_rwsem);  in copy_termios_locked()
548 	*kterm = tty->termios_locked;  in copy_termios_locked()
549 	up_read(&tty->termios_rwsem);  in copy_termios_locked()
552 static int get_termio(struct tty_struct *tty, struct termio __user *termio)  in get_termio()  argument
555 	copy_termios(tty, &kterm);  in get_termio()
567 static int get_sgflags(struct tty_struct *tty)  in get_sgflags()  argument
571 	if (!L_ICANON(tty)) {  in get_sgflags()
572 		if (L_ISIG(tty))  in get_sgflags()
577 	if (L_ECHO(tty))  in get_sgflags()
579 	if (O_OPOST(tty))  in get_sgflags()
580 		if (O_ONLCR(tty))  in get_sgflags()
585 static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)  in get_sgttyb()  argument
589 	down_read(&tty->termios_rwsem);  in get_sgttyb()
590 	tmp.sg_ispeed = tty->termios.c_ispeed;  in get_sgttyb()
591 	tmp.sg_ospeed = tty->termios.c_ospeed;  in get_sgttyb()
592 	tmp.sg_erase = tty->termios.c_cc[VERASE];  in get_sgttyb()
593 	tmp.sg_kill = tty->termios.c_cc[VKILL];  in get_sgttyb()
594 	tmp.sg_flags = get_sgflags(tty);  in get_sgttyb()
595 	up_read(&tty->termios_rwsem);  in get_sgttyb()
637 static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)  in set_sgttyb()  argument
643 	retval = tty_check_change(tty);  in set_sgttyb()
650 	down_write(&tty->termios_rwsem);  in set_sgttyb()
651 	termios = tty->termios;  in set_sgttyb()
658 	up_write(&tty->termios_rwsem);  in set_sgttyb()
659 	tty_set_termios(tty, &termios);  in set_sgttyb()
665 static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars)  in get_tchars()  argument
669 	down_read(&tty->termios_rwsem);  in get_tchars()
670 	tmp.t_intrc = tty->termios.c_cc[VINTR];  in get_tchars()
671 	tmp.t_quitc = tty->termios.c_cc[VQUIT];  in get_tchars()
672 	tmp.t_startc = tty->termios.c_cc[VSTART];  in get_tchars()
673 	tmp.t_stopc = tty->termios.c_cc[VSTOP];  in get_tchars()
674 	tmp.t_eofc = tty->termios.c_cc[VEOF];  in get_tchars()
675 	tmp.t_brkc = tty->termios.c_cc[VEOL2];	/* what is brkc anyway? */  in get_tchars()
676 	up_read(&tty->termios_rwsem);  in get_tchars()
680 static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars)  in set_tchars()  argument
686 	down_write(&tty->termios_rwsem);  in set_tchars()
687 	tty->termios.c_cc[VINTR] = tmp.t_intrc;  in set_tchars()
688 	tty->termios.c_cc[VQUIT] = tmp.t_quitc;  in set_tchars()
689 	tty->termios.c_cc[VSTART] = tmp.t_startc;  in set_tchars()
690 	tty->termios.c_cc[VSTOP] = tmp.t_stopc;  in set_tchars()
691 	tty->termios.c_cc[VEOF] = tmp.t_eofc;  in set_tchars()
692 	tty->termios.c_cc[VEOL2] = tmp.t_brkc;	/* what is brkc anyway? */  in set_tchars()
693 	up_write(&tty->termios_rwsem);  in set_tchars()
699 static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)  in get_ltchars()  argument
703 	down_read(&tty->termios_rwsem);  in get_ltchars()
704 	tmp.t_suspc = tty->termios.c_cc[VSUSP];  in get_ltchars()
706 	tmp.t_dsuspc = tty->termios.c_cc[VSUSP];  in get_ltchars()
707 	tmp.t_rprntc = tty->termios.c_cc[VREPRINT];  in get_ltchars()
709 	tmp.t_flushc = tty->termios.c_cc[VEOL2];  in get_ltchars()
710 	tmp.t_werasc = tty->termios.c_cc[VWERASE];  in get_ltchars()
711 	tmp.t_lnextc = tty->termios.c_cc[VLNEXT];  in get_ltchars()
712 	up_read(&tty->termios_rwsem);  in get_ltchars()
716 static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)  in set_ltchars()  argument
723 	down_write(&tty->termios_rwsem);  in set_ltchars()
724 	tty->termios.c_cc[VSUSP] = tmp.t_suspc;  in set_ltchars()
726 	tty->termios.c_cc[VEOL2] = tmp.t_dsuspc;  in set_ltchars()
727 	tty->termios.c_cc[VREPRINT] = tmp.t_rprntc;  in set_ltchars()
729 	tty->termios.c_cc[VEOL2] = tmp.t_flushc;  in set_ltchars()
730 	tty->termios.c_cc[VWERASE] = tmp.t_werasc;  in set_ltchars()
731 	tty->termios.c_cc[VLNEXT] = tmp.t_lnextc;  in set_ltchars()
732 	up_write(&tty->termios_rwsem);  in set_ltchars()
746 static int tty_change_softcar(struct tty_struct *tty, bool enable)  in tty_change_softcar()  argument
752 	down_write(&tty->termios_rwsem);  in tty_change_softcar()
753 	old = tty->termios;  in tty_change_softcar()
754 	tty->termios.c_cflag &= ~CLOCAL;  in tty_change_softcar()
755 	tty->termios.c_cflag |= bit;  in tty_change_softcar()
756 	if (tty->ops->set_termios)  in tty_change_softcar()
757 		tty->ops->set_termios(tty, &old);  in tty_change_softcar()
758 	if (C_CLOCAL(tty) != bit)  in tty_change_softcar()
760 	up_write(&tty->termios_rwsem);  in tty_change_softcar()
775 int tty_mode_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)  in tty_mode_ioctl()  argument
782 	if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&  in tty_mode_ioctl()
783 	    tty->driver->subtype == PTY_TYPE_MASTER)  in tty_mode_ioctl()
784 		real_tty = tty->link;  in tty_mode_ioctl()
786 		real_tty = tty;  in tty_mode_ioctl()
905 static int __tty_perform_flush(struct tty_struct *tty, unsigned long arg)  in __tty_perform_flush()  argument
907 	struct tty_ldisc *ld = tty->ldisc;  in __tty_perform_flush()
912 			ld->ops->flush_buffer(tty);  in __tty_perform_flush()
913 			tty_unthrottle(tty);  in __tty_perform_flush()
918 			ld->ops->flush_buffer(tty);  in __tty_perform_flush()
919 			tty_unthrottle(tty);  in __tty_perform_flush()
923 		tty_driver_flush_buffer(tty);  in __tty_perform_flush()
931 int tty_perform_flush(struct tty_struct *tty, unsigned long arg)  in tty_perform_flush()  argument
934 	int retval = tty_check_change(tty);  in tty_perform_flush()
938 	ld = tty_ldisc_ref_wait(tty);  in tty_perform_flush()
939 	retval = __tty_perform_flush(tty, arg);  in tty_perform_flush()
946 int n_tty_ioctl_helper(struct tty_struct *tty, unsigned int cmd,  in n_tty_ioctl_helper()  argument
953 		retval = tty_check_change(tty);  in n_tty_ioctl_helper()
958 			spin_lock_irq(&tty->flow.lock);  in n_tty_ioctl_helper()
959 			if (!tty->flow.tco_stopped) {  in n_tty_ioctl_helper()
960 				tty->flow.tco_stopped = true;  in n_tty_ioctl_helper()
961 				__stop_tty(tty);  in n_tty_ioctl_helper()
963 			spin_unlock_irq(&tty->flow.lock);  in n_tty_ioctl_helper()
966 			spin_lock_irq(&tty->flow.lock);  in n_tty_ioctl_helper()
967 			if (tty->flow.tco_stopped) {  in n_tty_ioctl_helper()
968 				tty->flow.tco_stopped = false;  in n_tty_ioctl_helper()
969 				__start_tty(tty);  in n_tty_ioctl_helper()
971 			spin_unlock_irq(&tty->flow.lock);  in n_tty_ioctl_helper()
974 			if (STOP_CHAR(tty) != __DISABLED_CHAR)  in n_tty_ioctl_helper()
975 				retval = tty_send_xchar(tty, STOP_CHAR(tty));  in n_tty_ioctl_helper()
978 			if (START_CHAR(tty) != __DISABLED_CHAR)  in n_tty_ioctl_helper()
979 				retval = tty_send_xchar(tty, START_CHAR(tty));  in n_tty_ioctl_helper()
986 		retval = tty_check_change(tty);  in n_tty_ioctl_helper()
989 		return __tty_perform_flush(tty, arg);  in n_tty_ioctl_helper()
992 		return tty_mode_ioctl(tty, cmd, arg);  in n_tty_ioctl_helper()