30 # define tty_debug_wait_until_sent(tty, f, args...)    tty_debug(tty, f, ##args)  argument
32 # define tty_debug_wait_until_sent(tty, f, args...)    do {} while (0)  argument
55 int tty_chars_in_buffer(struct tty_struct *tty)  in tty_chars_in_buffer()  argument
57 	if (tty->ops->chars_in_buffer)  in tty_chars_in_buffer()
58 		return tty->ops->chars_in_buffer(tty);  in tty_chars_in_buffer()
75 int tty_write_room(struct tty_struct *tty)  in tty_write_room()  argument
77 	if (tty->ops->write_room)  in tty_write_room()
78 		return tty->ops->write_room(tty);  in tty_write_room()
91 void tty_driver_flush_buffer(struct tty_struct *tty)  in tty_driver_flush_buffer()  argument
93 	if (tty->ops->flush_buffer)  in tty_driver_flush_buffer()
94 		tty->ops->flush_buffer(tty);  in tty_driver_flush_buffer()
108 void tty_throttle(struct tty_struct *tty)  in tty_throttle()  argument
110 	down_write(&tty->termios_rwsem);  in tty_throttle()
112 	if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) &&  in tty_throttle()
113 	    tty->ops->throttle)  in tty_throttle()
114 		tty->ops->throttle(tty);  in tty_throttle()
115 	tty->flow_change = 0;  in tty_throttle()
116 	up_write(&tty->termios_rwsem);  in tty_throttle()
133 void tty_unthrottle(struct tty_struct *tty)  in tty_unthrottle()  argument
135 	down_write(&tty->termios_rwsem);  in tty_unthrottle()
136 	if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&  in tty_unthrottle()
137 	    tty->ops->unthrottle)  in tty_unthrottle()
138 		tty->ops->unthrottle(tty);  in tty_unthrottle()
139 	tty->flow_change = 0;  in tty_unthrottle()
140 	up_write(&tty->termios_rwsem);  in tty_unthrottle()
156 int tty_throttle_safe(struct tty_struct *tty)  in tty_throttle_safe()  argument
160 	mutex_lock(&tty->throttle_mutex);  in tty_throttle_safe()
161 	if (!test_bit(TTY_THROTTLED, &tty->flags)) {  in tty_throttle_safe()
162 		if (tty->flow_change != TTY_THROTTLE_SAFE)  in tty_throttle_safe()
165 			set_bit(TTY_THROTTLED, &tty->flags);  in tty_throttle_safe()
166 			if (tty->ops->throttle)  in tty_throttle_safe()
167 				tty->ops->throttle(tty);  in tty_throttle_safe()
170 	mutex_unlock(&tty->throttle_mutex);  in tty_throttle_safe()
187 int tty_unthrottle_safe(struct tty_struct *tty)  in tty_unthrottle_safe()  argument
191 	mutex_lock(&tty->throttle_mutex);  in tty_unthrottle_safe()
192 	if (test_bit(TTY_THROTTLED, &tty->flags)) {  in tty_unthrottle_safe()
193 		if (tty->flow_change != TTY_UNTHROTTLE_SAFE)  in tty_unthrottle_safe()
196 			clear_bit(TTY_THROTTLED, &tty->flags);  in tty_unthrottle_safe()
197 			if (tty->ops->unthrottle)  in tty_unthrottle_safe()
198 				tty->ops->unthrottle(tty);  in tty_unthrottle_safe()
201 	mutex_unlock(&tty->throttle_mutex);  in tty_unthrottle_safe()
217 void tty_wait_until_sent(struct tty_struct *tty, long timeout)  in tty_wait_until_sent()  argument
219 	tty_debug_wait_until_sent(tty, "\n");  in tty_wait_until_sent()
224 	timeout = wait_event_interruptible_timeout(tty->write_wait,  in tty_wait_until_sent()
225 			!tty_chars_in_buffer(tty), timeout);  in tty_wait_until_sent()
232 	if (tty->ops->wait_until_sent)  in tty_wait_until_sent()
233 		tty->ops->wait_until_sent(tty, timeout);  in tty_wait_until_sent()
484 void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud)  in tty_encode_baud_rate()  argument
486 	tty_termios_encode_baud_rate(&tty->termios, ibaud, obaud);  in tty_encode_baud_rate()
542 int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)  in tty_set_termios()  argument
547 	WARN_ON(tty->driver->type == TTY_DRIVER_TYPE_PTY &&  in tty_set_termios()
548 		tty->driver->subtype == PTY_TYPE_MASTER);  in tty_set_termios()
556 	down_write(&tty->termios_rwsem);  in tty_set_termios()
557 	old_termios = tty->termios;  in tty_set_termios()
558 	tty->termios = *new_termios;  in tty_set_termios()
559 	unset_locked_termios(&tty->termios, &old_termios, &tty->termios_locked);  in tty_set_termios()
561 	if (tty->ops->set_termios)  in tty_set_termios()
562 		tty->ops->set_termios(tty, &old_termios);  in tty_set_termios()
564 		tty_termios_copy_hw(&tty->termios, &old_termios);  in tty_set_termios()
566 	ld = tty_ldisc_ref(tty);  in tty_set_termios()
569 			ld->ops->set_termios(tty, &old_termios);  in tty_set_termios()
572 	up_write(&tty->termios_rwsem);  in tty_set_termios()
590 static int set_termios(struct tty_struct *tty, void __user *arg, int opt)  in set_termios()  argument
594 	int retval = tty_check_change(tty);  in set_termios()
599 	down_read(&tty->termios_rwsem);  in set_termios()
600 	tmp_termios = tty->termios;  in set_termios()
601 	up_read(&tty->termios_rwsem);  in set_termios()
628 	ld = tty_ldisc_ref(tty);
632 			ld->ops->flush_buffer(tty);
637 		tty_wait_until_sent(tty, 0);
642 	tty_set_termios(tty, &tmp_termios);
651 static void copy_termios(struct tty_struct *tty, struct ktermios *kterm)  in copy_termios()  argument
653 	down_read(&tty->termios_rwsem);  in copy_termios()
654 	*kterm = tty->termios;  in copy_termios()
655 	up_read(&tty->termios_rwsem);  in copy_termios()
658 static void copy_termios_locked(struct tty_struct *tty, struct ktermios *kterm)  in copy_termios_locked()  argument
660 	down_read(&tty->termios_rwsem);  in copy_termios_locked()
661 	*kterm = tty->termios_locked;  in copy_termios_locked()
662 	up_read(&tty->termios_rwsem);  in copy_termios_locked()
665 static int get_termio(struct tty_struct *tty, struct termio __user *termio)  in get_termio()  argument
668 	copy_termios(tty, &kterm);  in get_termio()
687 static int set_termiox(struct tty_struct *tty, void __user *arg, int opt)  in set_termiox()  argument
692 	if (tty->termiox == NULL)  in set_termiox()
697 	ld = tty_ldisc_ref(tty);  in set_termiox()
700 			ld->ops->flush_buffer(tty);  in set_termiox()
704 		tty_wait_until_sent(tty, 0);  in set_termiox()
709 	down_write(&tty->termios_rwsem);  in set_termiox()
710 	if (tty->ops->set_termiox)  in set_termiox()
711 		tty->ops->set_termiox(tty, &tnew);  in set_termiox()
712 	up_write(&tty->termios_rwsem);  in set_termiox()
725 static int get_sgflags(struct tty_struct *tty)  in get_sgflags()  argument
729 	if (!(tty->termios.c_lflag & ICANON)) {  in get_sgflags()
730 		if (tty->termios.c_lflag & ISIG)  in get_sgflags()
735 	if (tty->termios.c_lflag & ECHO)  in get_sgflags()
737 	if (tty->termios.c_oflag & OPOST)  in get_sgflags()
738 		if (tty->termios.c_oflag & ONLCR)  in get_sgflags()
743 static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)  in get_sgttyb()  argument
747 	down_read(&tty->termios_rwsem);  in get_sgttyb()
748 	tmp.sg_ispeed = tty->termios.c_ispeed;  in get_sgttyb()
749 	tmp.sg_ospeed = tty->termios.c_ospeed;  in get_sgttyb()
750 	tmp.sg_erase = tty->termios.c_cc[VERASE];  in get_sgttyb()
751 	tmp.sg_kill = tty->termios.c_cc[VKILL];  in get_sgttyb()
752 	tmp.sg_flags = get_sgflags(tty);  in get_sgttyb()
753 	up_read(&tty->termios_rwsem);  in get_sgttyb()
795 static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)  in set_sgttyb()  argument
801 	retval = tty_check_change(tty);  in set_sgttyb()
808 	down_write(&tty->termios_rwsem);  in set_sgttyb()
809 	termios = tty->termios;  in set_sgttyb()
818 	up_write(&tty->termios_rwsem);  in set_sgttyb()
819 	tty_set_termios(tty, &termios);  in set_sgttyb()
825 static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars)  in get_tchars()  argument
829 	down_read(&tty->termios_rwsem);  in get_tchars()
830 	tmp.t_intrc = tty->termios.c_cc[VINTR];  in get_tchars()
831 	tmp.t_quitc = tty->termios.c_cc[VQUIT];  in get_tchars()
832 	tmp.t_startc = tty->termios.c_cc[VSTART];  in get_tchars()
833 	tmp.t_stopc = tty->termios.c_cc[VSTOP];  in get_tchars()
834 	tmp.t_eofc = tty->termios.c_cc[VEOF];  in get_tchars()
835 	tmp.t_brkc = tty->termios.c_cc[VEOL2];	/* what is brkc anyway? */  in get_tchars()
836 	up_read(&tty->termios_rwsem);  in get_tchars()
840 static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars)  in set_tchars()  argument
846 	down_write(&tty->termios_rwsem);  in set_tchars()
847 	tty->termios.c_cc[VINTR] = tmp.t_intrc;  in set_tchars()
848 	tty->termios.c_cc[VQUIT] = tmp.t_quitc;  in set_tchars()
849 	tty->termios.c_cc[VSTART] = tmp.t_startc;  in set_tchars()
850 	tty->termios.c_cc[VSTOP] = tmp.t_stopc;  in set_tchars()
851 	tty->termios.c_cc[VEOF] = tmp.t_eofc;  in set_tchars()
852 	tty->termios.c_cc[VEOL2] = tmp.t_brkc;	/* what is brkc anyway? */  in set_tchars()
853 	up_write(&tty->termios_rwsem);  in set_tchars()
859 static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)  in get_ltchars()  argument
863 	down_read(&tty->termios_rwsem);  in get_ltchars()
864 	tmp.t_suspc = tty->termios.c_cc[VSUSP];  in get_ltchars()
866 	tmp.t_dsuspc = tty->termios.c_cc[VSUSP];  in get_ltchars()
867 	tmp.t_rprntc = tty->termios.c_cc[VREPRINT];  in get_ltchars()
869 	tmp.t_flushc = tty->termios.c_cc[VEOL2];  in get_ltchars()
870 	tmp.t_werasc = tty->termios.c_cc[VWERASE];  in get_ltchars()
871 	tmp.t_lnextc = tty->termios.c_cc[VLNEXT];  in get_ltchars()
872 	up_read(&tty->termios_rwsem);  in get_ltchars()
876 static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)  in set_ltchars()  argument
883 	down_write(&tty->termios_rwsem);  in set_ltchars()
884 	tty->termios.c_cc[VSUSP] = tmp.t_suspc;  in set_ltchars()
886 	tty->termios.c_cc[VEOL2] = tmp.t_dsuspc;  in set_ltchars()
887 	tty->termios.c_cc[VREPRINT] = tmp.t_rprntc;  in set_ltchars()
889 	tty->termios.c_cc[VEOL2] = tmp.t_flushc;  in set_ltchars()
890 	tty->termios.c_cc[VWERASE] = tmp.t_werasc;  in set_ltchars()
891 	tty->termios.c_cc[VLNEXT] = tmp.t_lnextc;  in set_ltchars()
892 	up_write(&tty->termios_rwsem);  in set_ltchars()
906 static int tty_change_softcar(struct tty_struct *tty, int arg)  in tty_change_softcar()  argument
912 	down_write(&tty->termios_rwsem);  in tty_change_softcar()
913 	old = tty->termios;  in tty_change_softcar()
914 	tty->termios.c_cflag &= ~CLOCAL;  in tty_change_softcar()
915 	tty->termios.c_cflag |= bit;  in tty_change_softcar()
916 	if (tty->ops->set_termios)  in tty_change_softcar()
917 		tty->ops->set_termios(tty, &old);  in tty_change_softcar()
918 	if ((tty->termios.c_cflag & CLOCAL) != bit)  in tty_change_softcar()
920 	up_write(&tty->termios_rwsem);  in tty_change_softcar()
936 int tty_mode_ioctl(struct tty_struct *tty, struct file *file,  in tty_mode_ioctl()  argument
946 	if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&  in tty_mode_ioctl()
947 	    tty->driver->subtype == PTY_TYPE_MASTER)  in tty_mode_ioctl()
948 		real_tty = tty->link;  in tty_mode_ioctl()
950 		real_tty = tty;  in tty_mode_ioctl()
1081 static int __tty_perform_flush(struct tty_struct *tty, unsigned long arg)  in __tty_perform_flush()  argument
1083 	struct tty_ldisc *ld = tty->ldisc;  in __tty_perform_flush()
1088 			ld->ops->flush_buffer(tty);  in __tty_perform_flush()
1089 			tty_unthrottle(tty);  in __tty_perform_flush()
1094 			ld->ops->flush_buffer(tty);  in __tty_perform_flush()
1095 			tty_unthrottle(tty);  in __tty_perform_flush()
1099 		tty_driver_flush_buffer(tty);  in __tty_perform_flush()
1107 int tty_perform_flush(struct tty_struct *tty, unsigned long arg)  in tty_perform_flush()  argument
1110 	int retval = tty_check_change(tty);  in tty_perform_flush()
1114 	ld = tty_ldisc_ref_wait(tty);  in tty_perform_flush()
1115 	retval = __tty_perform_flush(tty, arg);  in tty_perform_flush()
1122 int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,  in n_tty_ioctl_helper()  argument
1129 		retval = tty_check_change(tty);  in n_tty_ioctl_helper()
1134 			spin_lock_irq(&tty->flow_lock);  in n_tty_ioctl_helper()
1135 			if (!tty->flow_stopped) {  in n_tty_ioctl_helper()
1136 				tty->flow_stopped = 1;  in n_tty_ioctl_helper()
1137 				__stop_tty(tty);  in n_tty_ioctl_helper()
1139 			spin_unlock_irq(&tty->flow_lock);  in n_tty_ioctl_helper()
1142 			spin_lock_irq(&tty->flow_lock);  in n_tty_ioctl_helper()
1143 			if (tty->flow_stopped) {  in n_tty_ioctl_helper()
1144 				tty->flow_stopped = 0;  in n_tty_ioctl_helper()
1145 				__start_tty(tty);  in n_tty_ioctl_helper()
1147 			spin_unlock_irq(&tty->flow_lock);  in n_tty_ioctl_helper()
1150 			if (STOP_CHAR(tty) != __DISABLED_CHAR)  in n_tty_ioctl_helper()
1151 				retval = tty_send_xchar(tty, STOP_CHAR(tty));  in n_tty_ioctl_helper()
1154 			if (START_CHAR(tty) != __DISABLED_CHAR)  in n_tty_ioctl_helper()
1155 				retval = tty_send_xchar(tty, START_CHAR(tty));  in n_tty_ioctl_helper()
1162 		retval = tty_check_change(tty);  in n_tty_ioctl_helper()
1165 		return __tty_perform_flush(tty, arg);  in n_tty_ioctl_helper()
1168 		return tty_mode_ioctl(tty, file, cmd, arg);  in n_tty_ioctl_helper()
1174 long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,  in n_tty_compat_ioctl_helper()  argument
1180 		return tty_mode_ioctl(tty, file, cmd, (unsigned long) compat_ptr(arg));  in n_tty_compat_ioctl_helper()