2 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Added support for a Unix98-style ptmx device.
5 * -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998
9 #include <linux/module.h>
10 #include <linux/errno.h>
11 #include <linux/interrupt.h>
12 #include <linux/tty.h>
13 #include <linux/tty_flip.h>
14 #include <linux/fcntl.h>
15 #include <linux/sched.h>
16 #include <linux/string.h>
17 #include <linux/major.h>
19 #include <linux/init.h>
20 #include <linux/device.h>
21 #include <linux/uaccess.h>
22 #include <linux/bitops.h>
23 #include <linux/devpts_fs.h>
24 #include <linux/slab.h>
25 #include <linux/mutex.h>
26 #include <linux/poll.h>
28 #undef TTY_DEBUG_HANGUP
29 #ifdef TTY_DEBUG_HANGUP
30 # define tty_debug_hangup(tty, f, args...) tty_debug(tty, f, ##args)
32 # define tty_debug_hangup(tty, f, args...) do {} while (0)
35 #ifdef CONFIG_UNIX98_PTYS
36 static struct tty_driver *ptm_driver;
37 static struct tty_driver *pts_driver;
38 static DEFINE_MUTEX(devpts_mutex);
41 static void pty_close(struct tty_struct *tty, struct file *filp)
44 if (tty->driver->subtype == PTY_TYPE_MASTER)
45 WARN_ON(tty->count > 1);
47 if (test_bit(TTY_IO_ERROR, &tty->flags))
52 set_bit(TTY_IO_ERROR, &tty->flags);
53 wake_up_interruptible(&tty->read_wait);
54 wake_up_interruptible(&tty->write_wait);
55 spin_lock_irq(&tty->ctrl_lock);
57 spin_unlock_irq(&tty->ctrl_lock);
58 /* Review - krefs on tty_link ?? */
61 set_bit(TTY_OTHER_CLOSED, &tty->link->flags);
62 tty_flip_buffer_push(tty->link->port);
63 wake_up_interruptible(&tty->link->write_wait);
64 if (tty->driver->subtype == PTY_TYPE_MASTER) {
65 set_bit(TTY_OTHER_CLOSED, &tty->flags);
66 #ifdef CONFIG_UNIX98_PTYS
67 if (tty->driver == ptm_driver) {
68 mutex_lock(&devpts_mutex);
69 if (tty->link->driver_data)
70 devpts_pty_kill(tty->link->driver_data);
71 mutex_unlock(&devpts_mutex);
74 tty_vhangup(tty->link);
79 * The unthrottle routine is called by the line discipline to signal
80 * that it can receive more characters. For PTY's, the TTY_THROTTLED
81 * flag is always set, to force the line discipline to always call the
82 * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE
83 * characters in the queue. This is necessary since each time this
84 * happens, we need to wake up any sleeping processes that could be
85 * (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
86 * for the pty buffer to be drained.
88 static void pty_unthrottle(struct tty_struct *tty)
90 tty_wakeup(tty->link);
91 set_bit(TTY_THROTTLED, &tty->flags);
95 * pty_write - write to a pty
96 * @tty: the tty we write from
97 * @buf: kernel buffer of data
98 * @count: bytes to write
100 * Our "hardware" write method. Data is coming from the ldisc which
101 * may be in a non sleeping state. We simply throw this at the other
102 * end of the link as if we were an IRQ handler receiving stuff for
103 * the other side of the pty/tty pair.
106 static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
108 struct tty_struct *to = tty->link;
114 /* Stuff the data into the input queue of the other end */
115 c = tty_insert_flip_string(to->port, buf, c);
118 tty_flip_buffer_push(to->port);
124 * pty_write_room - write space
125 * @tty: tty we are writing from
127 * Report how many bytes the ldisc can send into the queue for
131 static int pty_write_room(struct tty_struct *tty)
135 return tty_buffer_space_avail(tty->link->port);
139 * pty_chars_in_buffer - characters currently in our tx queue
142 * Report how much we have in the transmit queue. As everything is
143 * instantly at the other end this is easy to implement.
146 static int pty_chars_in_buffer(struct tty_struct *tty)
151 /* Set the lock flag on a pty */
152 static int pty_set_lock(struct tty_struct *tty, int __user *arg)
155 if (get_user(val, arg))
158 set_bit(TTY_PTY_LOCK, &tty->flags);
160 clear_bit(TTY_PTY_LOCK, &tty->flags);
164 static int pty_get_lock(struct tty_struct *tty, int __user *arg)
166 int locked = test_bit(TTY_PTY_LOCK, &tty->flags);
167 return put_user(locked, arg);
170 /* Set the packet mode on a pty */
171 static int pty_set_pktmode(struct tty_struct *tty, int __user *arg)
175 if (get_user(pktmode, arg))
178 spin_lock_irq(&tty->ctrl_lock);
181 tty->link->ctrl_status = 0;
187 spin_unlock_irq(&tty->ctrl_lock);
192 /* Get the packet mode of a pty */
193 static int pty_get_pktmode(struct tty_struct *tty, int __user *arg)
195 int pktmode = tty->packet;
196 return put_user(pktmode, arg);
199 /* Send a signal to the slave */
200 static int pty_signal(struct tty_struct *tty, int sig)
204 if (sig != SIGINT && sig != SIGQUIT && sig != SIGTSTP)
208 pgrp = tty_get_pgrp(tty->link);
210 kill_pgrp(pgrp, sig, 1);
216 static void pty_flush_buffer(struct tty_struct *tty)
218 struct tty_struct *to = tty->link;
219 struct tty_ldisc *ld;
224 ld = tty_ldisc_ref(to);
225 tty_buffer_flush(to, ld);
230 spin_lock_irq(&tty->ctrl_lock);
231 tty->ctrl_status |= TIOCPKT_FLUSHWRITE;
232 wake_up_interruptible(&to->read_wait);
233 spin_unlock_irq(&tty->ctrl_lock);
237 static int pty_open(struct tty_struct *tty, struct file *filp)
239 if (!tty || !tty->link)
242 if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
244 if (test_bit(TTY_PTY_LOCK, &tty->link->flags))
246 if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1)
249 clear_bit(TTY_IO_ERROR, &tty->flags);
250 /* TTY_OTHER_CLOSED must be cleared before TTY_OTHER_DONE */
251 clear_bit(TTY_OTHER_CLOSED, &tty->link->flags);
252 clear_bit(TTY_OTHER_DONE, &tty->link->flags);
253 set_bit(TTY_THROTTLED, &tty->flags);
257 set_bit(TTY_IO_ERROR, &tty->flags);
261 static void pty_set_termios(struct tty_struct *tty,
262 struct ktermios *old_termios)
264 /* See if packet mode change of state. */
265 if (tty->link && tty->link->packet) {
266 int extproc = (old_termios->c_lflag & EXTPROC) |
267 (tty->termios.c_lflag & EXTPROC);
268 int old_flow = ((old_termios->c_iflag & IXON) &&
269 (old_termios->c_cc[VSTOP] == '\023') &&
270 (old_termios->c_cc[VSTART] == '\021'));
271 int new_flow = (I_IXON(tty) &&
272 STOP_CHAR(tty) == '\023' &&
273 START_CHAR(tty) == '\021');
274 if ((old_flow != new_flow) || extproc) {
275 spin_lock_irq(&tty->ctrl_lock);
276 if (old_flow != new_flow) {
277 tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
279 tty->ctrl_status |= TIOCPKT_DOSTOP;
281 tty->ctrl_status |= TIOCPKT_NOSTOP;
284 tty->ctrl_status |= TIOCPKT_IOCTL;
285 spin_unlock_irq(&tty->ctrl_lock);
286 wake_up_interruptible(&tty->link->read_wait);
290 tty->termios.c_cflag &= ~(CSIZE | PARENB);
291 tty->termios.c_cflag |= (CS8 | CREAD);
295 * pty_do_resize - resize event
296 * @tty: tty being resized
297 * @ws: window size being set.
299 * Update the termios variables and send the necessary signals to
300 * peform a terminal resize correctly
303 static int pty_resize(struct tty_struct *tty, struct winsize *ws)
305 struct pid *pgrp, *rpgrp;
306 struct tty_struct *pty = tty->link;
308 /* For a PTY we need to lock the tty side */
309 mutex_lock(&tty->winsize_mutex);
310 if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
313 /* Signal the foreground process group of both ptys */
314 pgrp = tty_get_pgrp(tty);
315 rpgrp = tty_get_pgrp(pty);
318 kill_pgrp(pgrp, SIGWINCH, 1);
319 if (rpgrp != pgrp && rpgrp)
320 kill_pgrp(rpgrp, SIGWINCH, 1);
326 pty->winsize = *ws; /* Never used so will go away soon */
328 mutex_unlock(&tty->winsize_mutex);
333 * pty_start - start() handler
334 * pty_stop - stop() handler
335 * @tty: tty being flow-controlled
337 * Propagates the TIOCPKT status to the master pty.
339 * NB: only the master pty can be in packet mode so only the slave
340 * needs start()/stop() handlers
342 static void pty_start(struct tty_struct *tty)
346 if (tty->link && tty->link->packet) {
347 spin_lock_irqsave(&tty->ctrl_lock, flags);
348 tty->ctrl_status &= ~TIOCPKT_STOP;
349 tty->ctrl_status |= TIOCPKT_START;
350 spin_unlock_irqrestore(&tty->ctrl_lock, flags);
351 wake_up_interruptible_poll(&tty->link->read_wait, POLLIN);
355 static void pty_stop(struct tty_struct *tty)
359 if (tty->link && tty->link->packet) {
360 spin_lock_irqsave(&tty->ctrl_lock, flags);
361 tty->ctrl_status &= ~TIOCPKT_START;
362 tty->ctrl_status |= TIOCPKT_STOP;
363 spin_unlock_irqrestore(&tty->ctrl_lock, flags);
364 wake_up_interruptible_poll(&tty->link->read_wait, POLLIN);
369 * pty_common_install - set up the pty pair
370 * @driver: the pty driver
371 * @tty: the tty being instantiated
372 * @legacy: true if this is BSD style
374 * Perform the initial set up for the tty/pty pair. Called from the
375 * tty layer when the port is first opened.
377 * Locking: the caller must hold the tty_mutex
379 static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty,
382 struct tty_struct *o_tty;
383 struct tty_port *ports[2];
384 int idx = tty->index;
385 int retval = -ENOMEM;
387 /* Opening the slave first has always returned -EIO */
388 if (driver->subtype != PTY_TYPE_MASTER)
391 ports[0] = kmalloc(sizeof **ports, GFP_KERNEL);
392 ports[1] = kmalloc(sizeof **ports, GFP_KERNEL);
393 if (!ports[0] || !ports[1])
395 if (!try_module_get(driver->other->owner)) {
396 /* This cannot in fact currently happen */
399 o_tty = alloc_tty_struct(driver->other, idx);
403 tty_set_lock_subclass(o_tty);
404 lockdep_set_subclass(&o_tty->termios_rwsem, TTY_LOCK_SLAVE);
407 /* We always use new tty termios data so we can do this
409 retval = tty_init_termios(tty);
413 retval = tty_init_termios(o_tty);
415 goto err_free_termios;
417 driver->other->ttys[idx] = o_tty;
418 driver->ttys[idx] = tty;
420 memset(&tty->termios_locked, 0, sizeof(tty->termios_locked));
421 tty->termios = driver->init_termios;
422 memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked));
423 o_tty->termios = driver->other->init_termios;
427 * Everything allocated ... set up the o_tty structure.
429 tty_driver_kref_get(driver->other);
430 /* Establish the links in both directions */
433 tty_port_init(ports[0]);
434 tty_port_init(ports[1]);
435 tty_buffer_set_limit(ports[0], 8192);
436 tty_buffer_set_limit(ports[1], 8192);
437 o_tty->port = ports[0];
438 tty->port = ports[1];
439 o_tty->port->itty = o_tty;
441 tty_buffer_set_lock_subclass(o_tty->port);
443 tty_driver_kref_get(driver);
449 tty_free_termios(tty);
451 free_tty_struct(o_tty);
453 module_put(driver->other->owner);
460 static void pty_cleanup(struct tty_struct *tty)
462 tty_port_put(tty->port);
465 /* Traditional BSD devices */
466 #ifdef CONFIG_LEGACY_PTYS
468 static int pty_install(struct tty_driver *driver, struct tty_struct *tty)
470 return pty_common_install(driver, tty, true);
473 static void pty_remove(struct tty_driver *driver, struct tty_struct *tty)
475 struct tty_struct *pair = tty->link;
476 driver->ttys[tty->index] = NULL;
478 pair->driver->ttys[pair->index] = NULL;
481 static int pty_bsd_ioctl(struct tty_struct *tty,
482 unsigned int cmd, unsigned long arg)
485 case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
486 return pty_set_lock(tty, (int __user *) arg);
487 case TIOCGPTLCK: /* Get PT Lock status */
488 return pty_get_lock(tty, (int __user *)arg);
489 case TIOCPKT: /* Set PT packet mode */
490 return pty_set_pktmode(tty, (int __user *)arg);
491 case TIOCGPKT: /* Get PT packet mode */
492 return pty_get_pktmode(tty, (int __user *)arg);
493 case TIOCSIG: /* Send signal to other side of pty */
494 return pty_signal(tty, (int) arg);
495 case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */
501 static int legacy_count = CONFIG_LEGACY_PTY_COUNT;
503 * not really modular, but the easiest way to keep compat with existing
504 * bootargs behaviour is to continue using module_param here.
506 module_param(legacy_count, int, 0);
509 * The master side of a pty can do TIOCSPTLCK and thus
512 static const struct tty_operations master_pty_ops_bsd = {
513 .install = pty_install,
517 .write_room = pty_write_room,
518 .flush_buffer = pty_flush_buffer,
519 .chars_in_buffer = pty_chars_in_buffer,
520 .unthrottle = pty_unthrottle,
521 .ioctl = pty_bsd_ioctl,
522 .cleanup = pty_cleanup,
523 .resize = pty_resize,
527 static const struct tty_operations slave_pty_ops_bsd = {
528 .install = pty_install,
532 .write_room = pty_write_room,
533 .flush_buffer = pty_flush_buffer,
534 .chars_in_buffer = pty_chars_in_buffer,
535 .unthrottle = pty_unthrottle,
536 .set_termios = pty_set_termios,
537 .cleanup = pty_cleanup,
538 .resize = pty_resize,
544 static void __init legacy_pty_init(void)
546 struct tty_driver *pty_driver, *pty_slave_driver;
548 if (legacy_count <= 0)
551 pty_driver = tty_alloc_driver(legacy_count,
552 TTY_DRIVER_RESET_TERMIOS |
553 TTY_DRIVER_REAL_RAW |
554 TTY_DRIVER_DYNAMIC_ALLOC);
555 if (IS_ERR(pty_driver))
556 panic("Couldn't allocate pty driver");
558 pty_slave_driver = tty_alloc_driver(legacy_count,
559 TTY_DRIVER_RESET_TERMIOS |
560 TTY_DRIVER_REAL_RAW |
561 TTY_DRIVER_DYNAMIC_ALLOC);
562 if (IS_ERR(pty_slave_driver))
563 panic("Couldn't allocate pty slave driver");
565 pty_driver->driver_name = "pty_master";
566 pty_driver->name = "pty";
567 pty_driver->major = PTY_MASTER_MAJOR;
568 pty_driver->minor_start = 0;
569 pty_driver->type = TTY_DRIVER_TYPE_PTY;
570 pty_driver->subtype = PTY_TYPE_MASTER;
571 pty_driver->init_termios = tty_std_termios;
572 pty_driver->init_termios.c_iflag = 0;
573 pty_driver->init_termios.c_oflag = 0;
574 pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
575 pty_driver->init_termios.c_lflag = 0;
576 pty_driver->init_termios.c_ispeed = 38400;
577 pty_driver->init_termios.c_ospeed = 38400;
578 pty_driver->other = pty_slave_driver;
579 tty_set_operations(pty_driver, &master_pty_ops_bsd);
581 pty_slave_driver->driver_name = "pty_slave";
582 pty_slave_driver->name = "ttyp";
583 pty_slave_driver->major = PTY_SLAVE_MAJOR;
584 pty_slave_driver->minor_start = 0;
585 pty_slave_driver->type = TTY_DRIVER_TYPE_PTY;
586 pty_slave_driver->subtype = PTY_TYPE_SLAVE;
587 pty_slave_driver->init_termios = tty_std_termios;
588 pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
589 pty_slave_driver->init_termios.c_ispeed = 38400;
590 pty_slave_driver->init_termios.c_ospeed = 38400;
591 pty_slave_driver->other = pty_driver;
592 tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd);
594 if (tty_register_driver(pty_driver))
595 panic("Couldn't register pty driver");
596 if (tty_register_driver(pty_slave_driver))
597 panic("Couldn't register pty slave driver");
600 static inline void legacy_pty_init(void) { }
604 #ifdef CONFIG_UNIX98_PTYS
606 static struct cdev ptmx_cdev;
608 static int pty_unix98_ioctl(struct tty_struct *tty,
609 unsigned int cmd, unsigned long arg)
612 case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
613 return pty_set_lock(tty, (int __user *)arg);
614 case TIOCGPTLCK: /* Get PT Lock status */
615 return pty_get_lock(tty, (int __user *)arg);
616 case TIOCPKT: /* Set PT packet mode */
617 return pty_set_pktmode(tty, (int __user *)arg);
618 case TIOCGPKT: /* Get PT packet mode */
619 return pty_get_pktmode(tty, (int __user *)arg);
620 case TIOCGPTN: /* Get PT Number */
621 return put_user(tty->index, (unsigned int __user *)arg);
622 case TIOCSIG: /* Send signal to other side of pty */
623 return pty_signal(tty, (int) arg);
630 * ptm_unix98_lookup - find a pty master
631 * @driver: ptm driver
634 * Look up a pty master device. Called under the tty_mutex for now.
635 * This provides our locking.
638 static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver,
639 struct inode *ptm_inode, int idx)
641 /* Master must be open via /dev/ptmx */
642 return ERR_PTR(-EIO);
646 * pts_unix98_lookup - find a pty slave
647 * @driver: pts driver
650 * Look up a pty master device. Called under the tty_mutex for now.
651 * This provides our locking for the tty pointer.
654 static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver,
655 struct inode *pts_inode, int idx)
657 struct tty_struct *tty;
659 mutex_lock(&devpts_mutex);
660 tty = devpts_get_priv(pts_inode);
661 mutex_unlock(&devpts_mutex);
662 /* Master must be open before slave */
664 return ERR_PTR(-EIO);
668 /* We have no need to install and remove our tty objects as devpts does all
671 static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty)
673 return pty_common_install(driver, tty, false);
676 static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
680 /* this is called once with whichever end is closed last */
681 static void pty_unix98_shutdown(struct tty_struct *tty)
683 devpts_kill_index(tty->driver_data, tty->index);
686 static const struct tty_operations ptm_unix98_ops = {
687 .lookup = ptm_unix98_lookup,
688 .install = pty_unix98_install,
689 .remove = pty_unix98_remove,
693 .write_room = pty_write_room,
694 .flush_buffer = pty_flush_buffer,
695 .chars_in_buffer = pty_chars_in_buffer,
696 .unthrottle = pty_unthrottle,
697 .ioctl = pty_unix98_ioctl,
698 .resize = pty_resize,
699 .shutdown = pty_unix98_shutdown,
700 .cleanup = pty_cleanup
703 static const struct tty_operations pty_unix98_ops = {
704 .lookup = pts_unix98_lookup,
705 .install = pty_unix98_install,
706 .remove = pty_unix98_remove,
710 .write_room = pty_write_room,
711 .flush_buffer = pty_flush_buffer,
712 .chars_in_buffer = pty_chars_in_buffer,
713 .unthrottle = pty_unthrottle,
714 .set_termios = pty_set_termios,
717 .shutdown = pty_unix98_shutdown,
718 .cleanup = pty_cleanup,
722 * ptmx_open - open a unix 98 pty master
723 * @inode: inode of device file
724 * @filp: file pointer to tty
726 * Allocate a unix98 pty master device from the ptmx driver.
728 * Locking: tty_mutex protects the init_dev work. tty->count should
730 * allocated_ptys_lock handles the list of free pty numbers
733 static int ptmx_open(struct inode *inode, struct file *filp)
735 struct tty_struct *tty;
736 struct inode *slave_inode;
740 nonseekable_open(inode, filp);
742 /* We refuse fsnotify events on ptmx, since it's a shared resource */
743 filp->f_mode |= FMODE_NONOTIFY;
745 retval = tty_alloc_file(filp);
749 /* find a device that is not in use. */
750 mutex_lock(&devpts_mutex);
751 index = devpts_new_index(inode);
754 mutex_unlock(&devpts_mutex);
758 mutex_unlock(&devpts_mutex);
760 mutex_lock(&tty_mutex);
761 tty = tty_init_dev(ptm_driver, index);
764 retval = PTR_ERR(tty);
768 /* The tty returned here is locked so we can safely
770 mutex_unlock(&tty_mutex);
772 set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
773 tty->driver_data = inode;
775 tty_add_file(tty, filp);
777 slave_inode = devpts_pty_new(inode,
778 MKDEV(UNIX98_PTY_SLAVE_MAJOR, index), index,
780 if (IS_ERR(slave_inode)) {
781 retval = PTR_ERR(slave_inode);
784 tty->link->driver_data = slave_inode;
786 retval = ptm_driver->ops->open(tty, filp);
790 tty_debug_hangup(tty, "opening (count=%d)\n", tty->count);
796 tty_release(inode, filp);
799 mutex_unlock(&tty_mutex);
800 devpts_kill_index(inode, index);
806 static struct file_operations ptmx_fops;
808 static void __init unix98_pty_init(void)
810 ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX,
811 TTY_DRIVER_RESET_TERMIOS |
812 TTY_DRIVER_REAL_RAW |
813 TTY_DRIVER_DYNAMIC_DEV |
814 TTY_DRIVER_DEVPTS_MEM |
815 TTY_DRIVER_DYNAMIC_ALLOC);
816 if (IS_ERR(ptm_driver))
817 panic("Couldn't allocate Unix98 ptm driver");
818 pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX,
819 TTY_DRIVER_RESET_TERMIOS |
820 TTY_DRIVER_REAL_RAW |
821 TTY_DRIVER_DYNAMIC_DEV |
822 TTY_DRIVER_DEVPTS_MEM |
823 TTY_DRIVER_DYNAMIC_ALLOC);
824 if (IS_ERR(pts_driver))
825 panic("Couldn't allocate Unix98 pts driver");
827 ptm_driver->driver_name = "pty_master";
828 ptm_driver->name = "ptm";
829 ptm_driver->major = UNIX98_PTY_MASTER_MAJOR;
830 ptm_driver->minor_start = 0;
831 ptm_driver->type = TTY_DRIVER_TYPE_PTY;
832 ptm_driver->subtype = PTY_TYPE_MASTER;
833 ptm_driver->init_termios = tty_std_termios;
834 ptm_driver->init_termios.c_iflag = 0;
835 ptm_driver->init_termios.c_oflag = 0;
836 ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
837 ptm_driver->init_termios.c_lflag = 0;
838 ptm_driver->init_termios.c_ispeed = 38400;
839 ptm_driver->init_termios.c_ospeed = 38400;
840 ptm_driver->other = pts_driver;
841 tty_set_operations(ptm_driver, &ptm_unix98_ops);
843 pts_driver->driver_name = "pty_slave";
844 pts_driver->name = "pts";
845 pts_driver->major = UNIX98_PTY_SLAVE_MAJOR;
846 pts_driver->minor_start = 0;
847 pts_driver->type = TTY_DRIVER_TYPE_PTY;
848 pts_driver->subtype = PTY_TYPE_SLAVE;
849 pts_driver->init_termios = tty_std_termios;
850 pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
851 pts_driver->init_termios.c_ispeed = 38400;
852 pts_driver->init_termios.c_ospeed = 38400;
853 pts_driver->other = ptm_driver;
854 tty_set_operations(pts_driver, &pty_unix98_ops);
856 if (tty_register_driver(ptm_driver))
857 panic("Couldn't register Unix98 ptm driver");
858 if (tty_register_driver(pts_driver))
859 panic("Couldn't register Unix98 pts driver");
861 /* Now create the /dev/ptmx special device */
862 tty_default_fops(&ptmx_fops);
863 ptmx_fops.open = ptmx_open;
865 cdev_init(&ptmx_cdev, &ptmx_fops);
866 if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) ||
867 register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0)
868 panic("Couldn't register /dev/ptmx driver");
869 device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx");
873 static inline void unix98_pty_init(void) { }
876 static int __init pty_init(void)
882 device_initcall(pty_init);