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>
11 #include <linux/errno.h>
12 #include <linux/interrupt.h>
13 #include <linux/tty.h>
14 #include <linux/tty_flip.h>
15 #include <linux/fcntl.h>
16 #include <linux/sched.h>
17 #include <linux/string.h>
18 #include <linux/major.h>
20 #include <linux/init.h>
21 #include <linux/device.h>
22 #include <linux/uaccess.h>
23 #include <linux/bitops.h>
24 #include <linux/devpts_fs.h>
25 #include <linux/slab.h>
26 #include <linux/mutex.h>
27 #include <linux/poll.h>
30 #ifdef CONFIG_UNIX98_PTYS
31 static struct tty_driver *ptm_driver;
32 static struct tty_driver *pts_driver;
33 static DEFINE_MUTEX(devpts_mutex);
36 static void pty_close(struct tty_struct *tty, struct file *filp)
39 if (tty->driver->subtype == PTY_TYPE_MASTER)
40 WARN_ON(tty->count > 1);
42 if (test_bit(TTY_IO_ERROR, &tty->flags))
47 set_bit(TTY_IO_ERROR, &tty->flags);
48 wake_up_interruptible(&tty->read_wait);
49 wake_up_interruptible(&tty->write_wait);
50 spin_lock_irq(&tty->ctrl_lock);
52 spin_unlock_irq(&tty->ctrl_lock);
53 /* Review - krefs on tty_link ?? */
56 tty_flush_to_ldisc(tty->link);
57 set_bit(TTY_OTHER_CLOSED, &tty->link->flags);
58 wake_up_interruptible(&tty->link->read_wait);
59 wake_up_interruptible(&tty->link->write_wait);
60 if (tty->driver->subtype == PTY_TYPE_MASTER) {
61 set_bit(TTY_OTHER_CLOSED, &tty->flags);
62 #ifdef CONFIG_UNIX98_PTYS
63 if (tty->driver == ptm_driver) {
64 mutex_lock(&devpts_mutex);
65 if (tty->link->driver_data)
66 devpts_pty_kill(tty->link->driver_data);
67 mutex_unlock(&devpts_mutex);
70 tty_vhangup(tty->link);
75 * The unthrottle routine is called by the line discipline to signal
76 * that it can receive more characters. For PTY's, the TTY_THROTTLED
77 * flag is always set, to force the line discipline to always call the
78 * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE
79 * characters in the queue. This is necessary since each time this
80 * happens, we need to wake up any sleeping processes that could be
81 * (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
82 * for the pty buffer to be drained.
84 static void pty_unthrottle(struct tty_struct *tty)
86 tty_wakeup(tty->link);
87 set_bit(TTY_THROTTLED, &tty->flags);
91 * pty_space - report space left for writing
92 * @to: tty we are writing into
94 * Limit the buffer space used by ptys to 8k.
97 static int pty_space(struct tty_struct *to)
99 int n = tty_buffer_space_avail(to->port);
104 * pty_write - write to a pty
105 * @tty: the tty we write from
106 * @buf: kernel buffer of data
107 * @count: bytes to write
109 * Our "hardware" write method. Data is coming from the ldisc which
110 * may be in a non sleeping state. We simply throw this at the other
111 * end of the link as if we were an IRQ handler receiving stuff for
112 * the other side of the pty/tty pair.
115 static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
117 struct tty_struct *to = tty->link;
123 /* Stuff the data into the input queue of the other end */
124 c = tty_insert_flip_string(to->port, buf, c);
127 tty_flip_buffer_push(to->port);
133 * pty_write_room - write space
134 * @tty: tty we are writing from
136 * Report how many bytes the ldisc can send into the queue for
140 static int pty_write_room(struct tty_struct *tty)
144 return pty_space(tty->link);
148 * pty_chars_in_buffer - characters currently in our tx queue
151 * Report how much we have in the transmit queue. As everything is
152 * instantly at the other end this is easy to implement.
155 static int pty_chars_in_buffer(struct tty_struct *tty)
160 /* Set the lock flag on a pty */
161 static int pty_set_lock(struct tty_struct *tty, int __user *arg)
164 if (get_user(val, arg))
167 set_bit(TTY_PTY_LOCK, &tty->flags);
169 clear_bit(TTY_PTY_LOCK, &tty->flags);
173 static int pty_get_lock(struct tty_struct *tty, int __user *arg)
175 int locked = test_bit(TTY_PTY_LOCK, &tty->flags);
176 return put_user(locked, arg);
179 /* Set the packet mode on a pty */
180 static int pty_set_pktmode(struct tty_struct *tty, int __user *arg)
184 if (get_user(pktmode, arg))
187 spin_lock_irq(&tty->ctrl_lock);
190 tty->link->ctrl_status = 0;
196 spin_unlock_irq(&tty->ctrl_lock);
201 /* Get the packet mode of a pty */
202 static int pty_get_pktmode(struct tty_struct *tty, int __user *arg)
204 int pktmode = tty->packet;
205 return put_user(pktmode, arg);
208 /* Send a signal to the slave */
209 static int pty_signal(struct tty_struct *tty, int sig)
213 if (sig != SIGINT && sig != SIGQUIT && sig != SIGTSTP)
217 pgrp = tty_get_pgrp(tty->link);
219 kill_pgrp(pgrp, sig, 1);
225 static void pty_flush_buffer(struct tty_struct *tty)
227 struct tty_struct *to = tty->link;
231 /* tty_buffer_flush(to); FIXME */
233 spin_lock_irq(&tty->ctrl_lock);
234 tty->ctrl_status |= TIOCPKT_FLUSHWRITE;
235 wake_up_interruptible(&to->read_wait);
236 spin_unlock_irq(&tty->ctrl_lock);
240 static int pty_open(struct tty_struct *tty, struct file *filp)
242 if (!tty || !tty->link)
245 if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
247 if (test_bit(TTY_PTY_LOCK, &tty->link->flags))
249 if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1)
252 clear_bit(TTY_IO_ERROR, &tty->flags);
253 clear_bit(TTY_OTHER_CLOSED, &tty->link->flags);
254 set_bit(TTY_THROTTLED, &tty->flags);
258 set_bit(TTY_IO_ERROR, &tty->flags);
262 static void pty_set_termios(struct tty_struct *tty,
263 struct ktermios *old_termios)
265 /* See if packet mode change of state. */
266 if (tty->link && tty->link->packet) {
267 int extproc = (old_termios->c_lflag & EXTPROC) |
268 (tty->termios.c_lflag & EXTPROC);
269 int old_flow = ((old_termios->c_iflag & IXON) &&
270 (old_termios->c_cc[VSTOP] == '\023') &&
271 (old_termios->c_cc[VSTART] == '\021'));
272 int new_flow = (I_IXON(tty) &&
273 STOP_CHAR(tty) == '\023' &&
274 START_CHAR(tty) == '\021');
275 if ((old_flow != new_flow) || extproc) {
276 spin_lock_irq(&tty->ctrl_lock);
277 if (old_flow != new_flow) {
278 tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
280 tty->ctrl_status |= TIOCPKT_DOSTOP;
282 tty->ctrl_status |= TIOCPKT_NOSTOP;
285 tty->ctrl_status |= TIOCPKT_IOCTL;
286 spin_unlock_irq(&tty->ctrl_lock);
287 wake_up_interruptible(&tty->link->read_wait);
291 tty->termios.c_cflag &= ~(CSIZE | PARENB);
292 tty->termios.c_cflag |= (CS8 | CREAD);
296 * pty_do_resize - resize event
297 * @tty: tty being resized
298 * @ws: window size being set.
300 * Update the termios variables and send the necessary signals to
301 * peform a terminal resize correctly
304 static int pty_resize(struct tty_struct *tty, struct winsize *ws)
306 struct pid *pgrp, *rpgrp;
307 struct tty_struct *pty = tty->link;
309 /* For a PTY we need to lock the tty side */
310 mutex_lock(&tty->winsize_mutex);
311 if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
314 /* Signal the foreground process group of both ptys */
315 pgrp = tty_get_pgrp(tty);
316 rpgrp = tty_get_pgrp(pty);
319 kill_pgrp(pgrp, SIGWINCH, 1);
320 if (rpgrp != pgrp && rpgrp)
321 kill_pgrp(rpgrp, SIGWINCH, 1);
327 pty->winsize = *ws; /* Never used so will go away soon */
329 mutex_unlock(&tty->winsize_mutex);
334 * pty_start - start() handler
335 * pty_stop - stop() handler
336 * @tty: tty being flow-controlled
338 * Propagates the TIOCPKT status to the master pty.
340 * NB: only the master pty can be in packet mode so only the slave
341 * needs start()/stop() handlers
343 static void pty_start(struct tty_struct *tty)
347 if (tty->link && tty->link->packet) {
348 spin_lock_irqsave(&tty->ctrl_lock, flags);
349 tty->ctrl_status &= ~TIOCPKT_STOP;
350 tty->ctrl_status |= TIOCPKT_START;
351 spin_unlock_irqrestore(&tty->ctrl_lock, flags);
352 wake_up_interruptible_poll(&tty->link->read_wait, POLLIN);
356 static void pty_stop(struct tty_struct *tty)
360 if (tty->link && tty->link->packet) {
361 spin_lock_irqsave(&tty->ctrl_lock, flags);
362 tty->ctrl_status &= ~TIOCPKT_START;
363 tty->ctrl_status |= TIOCPKT_STOP;
364 spin_unlock_irqrestore(&tty->ctrl_lock, flags);
365 wake_up_interruptible_poll(&tty->link->read_wait, POLLIN);
370 * pty_common_install - set up the pty pair
371 * @driver: the pty driver
372 * @tty: the tty being instantiated
373 * @legacy: true if this is BSD style
375 * Perform the initial set up for the tty/pty pair. Called from the
376 * tty layer when the port is first opened.
378 * Locking: the caller must hold the tty_mutex
380 static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty,
383 struct tty_struct *o_tty;
384 struct tty_port *ports[2];
385 int idx = tty->index;
386 int retval = -ENOMEM;
388 /* Opening the slave first has always returned -EIO */
389 if (driver->subtype != PTY_TYPE_MASTER)
392 ports[0] = kmalloc(sizeof **ports, GFP_KERNEL);
393 ports[1] = kmalloc(sizeof **ports, GFP_KERNEL);
394 if (!ports[0] || !ports[1])
396 if (!try_module_get(driver->other->owner)) {
397 /* This cannot in fact currently happen */
400 o_tty = alloc_tty_struct(driver->other, idx);
404 tty_set_lock_subclass(o_tty);
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 o_tty->port = ports[0];
436 tty->port = ports[1];
437 o_tty->port->itty = o_tty;
439 tty_driver_kref_get(driver);
445 tty_free_termios(tty);
447 deinitialize_tty_struct(o_tty);
448 free_tty_struct(o_tty);
450 module_put(driver->other->owner);
457 static void pty_cleanup(struct tty_struct *tty)
459 tty_port_put(tty->port);
462 /* Traditional BSD devices */
463 #ifdef CONFIG_LEGACY_PTYS
465 static int pty_install(struct tty_driver *driver, struct tty_struct *tty)
467 return pty_common_install(driver, tty, true);
470 static void pty_remove(struct tty_driver *driver, struct tty_struct *tty)
472 struct tty_struct *pair = tty->link;
473 driver->ttys[tty->index] = NULL;
475 pair->driver->ttys[pair->index] = NULL;
478 static int pty_bsd_ioctl(struct tty_struct *tty,
479 unsigned int cmd, unsigned long arg)
482 case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
483 return pty_set_lock(tty, (int __user *) arg);
484 case TIOCGPTLCK: /* Get PT Lock status */
485 return pty_get_lock(tty, (int __user *)arg);
486 case TIOCPKT: /* Set PT packet mode */
487 return pty_set_pktmode(tty, (int __user *)arg);
488 case TIOCGPKT: /* Get PT packet mode */
489 return pty_get_pktmode(tty, (int __user *)arg);
490 case TIOCSIG: /* Send signal to other side of pty */
491 return pty_signal(tty, (int) arg);
492 case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */
498 static int legacy_count = CONFIG_LEGACY_PTY_COUNT;
499 module_param(legacy_count, int, 0);
502 * The master side of a pty can do TIOCSPTLCK and thus
505 static const struct tty_operations master_pty_ops_bsd = {
506 .install = pty_install,
510 .write_room = pty_write_room,
511 .flush_buffer = pty_flush_buffer,
512 .chars_in_buffer = pty_chars_in_buffer,
513 .unthrottle = pty_unthrottle,
514 .ioctl = pty_bsd_ioctl,
515 .cleanup = pty_cleanup,
516 .resize = pty_resize,
520 static const struct tty_operations slave_pty_ops_bsd = {
521 .install = pty_install,
525 .write_room = pty_write_room,
526 .flush_buffer = pty_flush_buffer,
527 .chars_in_buffer = pty_chars_in_buffer,
528 .unthrottle = pty_unthrottle,
529 .set_termios = pty_set_termios,
530 .cleanup = pty_cleanup,
531 .resize = pty_resize,
537 static void __init legacy_pty_init(void)
539 struct tty_driver *pty_driver, *pty_slave_driver;
541 if (legacy_count <= 0)
544 pty_driver = tty_alloc_driver(legacy_count,
545 TTY_DRIVER_RESET_TERMIOS |
546 TTY_DRIVER_REAL_RAW |
547 TTY_DRIVER_DYNAMIC_ALLOC);
548 if (IS_ERR(pty_driver))
549 panic("Couldn't allocate pty driver");
551 pty_slave_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_slave_driver))
556 panic("Couldn't allocate pty slave driver");
558 pty_driver->driver_name = "pty_master";
559 pty_driver->name = "pty";
560 pty_driver->major = PTY_MASTER_MAJOR;
561 pty_driver->minor_start = 0;
562 pty_driver->type = TTY_DRIVER_TYPE_PTY;
563 pty_driver->subtype = PTY_TYPE_MASTER;
564 pty_driver->init_termios = tty_std_termios;
565 pty_driver->init_termios.c_iflag = 0;
566 pty_driver->init_termios.c_oflag = 0;
567 pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
568 pty_driver->init_termios.c_lflag = 0;
569 pty_driver->init_termios.c_ispeed = 38400;
570 pty_driver->init_termios.c_ospeed = 38400;
571 pty_driver->other = pty_slave_driver;
572 tty_set_operations(pty_driver, &master_pty_ops_bsd);
574 pty_slave_driver->driver_name = "pty_slave";
575 pty_slave_driver->name = "ttyp";
576 pty_slave_driver->major = PTY_SLAVE_MAJOR;
577 pty_slave_driver->minor_start = 0;
578 pty_slave_driver->type = TTY_DRIVER_TYPE_PTY;
579 pty_slave_driver->subtype = PTY_TYPE_SLAVE;
580 pty_slave_driver->init_termios = tty_std_termios;
581 pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
582 pty_slave_driver->init_termios.c_ispeed = 38400;
583 pty_slave_driver->init_termios.c_ospeed = 38400;
584 pty_slave_driver->other = pty_driver;
585 tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd);
587 if (tty_register_driver(pty_driver))
588 panic("Couldn't register pty driver");
589 if (tty_register_driver(pty_slave_driver))
590 panic("Couldn't register pty slave driver");
593 static inline void legacy_pty_init(void) { }
597 #ifdef CONFIG_UNIX98_PTYS
599 static struct cdev ptmx_cdev;
601 static int pty_unix98_ioctl(struct tty_struct *tty,
602 unsigned int cmd, unsigned long arg)
605 case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
606 return pty_set_lock(tty, (int __user *)arg);
607 case TIOCGPTLCK: /* Get PT Lock status */
608 return pty_get_lock(tty, (int __user *)arg);
609 case TIOCPKT: /* Set PT packet mode */
610 return pty_set_pktmode(tty, (int __user *)arg);
611 case TIOCGPKT: /* Get PT packet mode */
612 return pty_get_pktmode(tty, (int __user *)arg);
613 case TIOCGPTN: /* Get PT Number */
614 return put_user(tty->index, (unsigned int __user *)arg);
615 case TIOCSIG: /* Send signal to other side of pty */
616 return pty_signal(tty, (int) arg);
623 * ptm_unix98_lookup - find a pty master
624 * @driver: ptm driver
627 * Look up a pty master device. Called under the tty_mutex for now.
628 * This provides our locking.
631 static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver,
632 struct inode *ptm_inode, int idx)
634 /* Master must be open via /dev/ptmx */
635 return ERR_PTR(-EIO);
639 * pts_unix98_lookup - find a pty slave
640 * @driver: pts driver
643 * Look up a pty master device. Called under the tty_mutex for now.
644 * This provides our locking for the tty pointer.
647 static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver,
648 struct inode *pts_inode, int idx)
650 struct tty_struct *tty;
652 mutex_lock(&devpts_mutex);
653 tty = devpts_get_priv(pts_inode);
654 mutex_unlock(&devpts_mutex);
655 /* Master must be open before slave */
657 return ERR_PTR(-EIO);
661 /* We have no need to install and remove our tty objects as devpts does all
664 static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty)
666 return pty_common_install(driver, tty, false);
669 static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
673 /* this is called once with whichever end is closed last */
674 static void pty_unix98_shutdown(struct tty_struct *tty)
676 devpts_kill_index(tty->driver_data, tty->index);
679 static const struct tty_operations ptm_unix98_ops = {
680 .lookup = ptm_unix98_lookup,
681 .install = pty_unix98_install,
682 .remove = pty_unix98_remove,
686 .write_room = pty_write_room,
687 .flush_buffer = pty_flush_buffer,
688 .chars_in_buffer = pty_chars_in_buffer,
689 .unthrottle = pty_unthrottle,
690 .ioctl = pty_unix98_ioctl,
691 .resize = pty_resize,
692 .shutdown = pty_unix98_shutdown,
693 .cleanup = pty_cleanup
696 static const struct tty_operations pty_unix98_ops = {
697 .lookup = pts_unix98_lookup,
698 .install = pty_unix98_install,
699 .remove = pty_unix98_remove,
703 .write_room = pty_write_room,
704 .flush_buffer = pty_flush_buffer,
705 .chars_in_buffer = pty_chars_in_buffer,
706 .unthrottle = pty_unthrottle,
707 .set_termios = pty_set_termios,
710 .shutdown = pty_unix98_shutdown,
711 .cleanup = pty_cleanup,
715 * ptmx_open - open a unix 98 pty master
716 * @inode: inode of device file
717 * @filp: file pointer to tty
719 * Allocate a unix98 pty master device from the ptmx driver.
721 * Locking: tty_mutex protects the init_dev work. tty->count should
723 * allocated_ptys_lock handles the list of free pty numbers
726 static int ptmx_open(struct inode *inode, struct file *filp)
728 struct tty_struct *tty;
729 struct inode *slave_inode;
733 nonseekable_open(inode, filp);
735 /* We refuse fsnotify events on ptmx, since it's a shared resource */
736 filp->f_mode |= FMODE_NONOTIFY;
738 retval = tty_alloc_file(filp);
742 /* find a device that is not in use. */
743 mutex_lock(&devpts_mutex);
744 index = devpts_new_index(inode);
747 mutex_unlock(&devpts_mutex);
751 mutex_unlock(&devpts_mutex);
753 mutex_lock(&tty_mutex);
754 tty = tty_init_dev(ptm_driver, index);
757 retval = PTR_ERR(tty);
761 /* The tty returned here is locked so we can safely
763 mutex_unlock(&tty_mutex);
765 set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
766 tty->driver_data = inode;
768 tty_add_file(tty, filp);
770 slave_inode = devpts_pty_new(inode,
771 MKDEV(UNIX98_PTY_SLAVE_MAJOR, index), index,
773 if (IS_ERR(slave_inode)) {
774 retval = PTR_ERR(slave_inode);
777 tty->link->driver_data = slave_inode;
779 retval = ptm_driver->ops->open(tty, filp);
787 tty_release(inode, filp);
790 mutex_unlock(&tty_mutex);
791 devpts_kill_index(inode, index);
797 static struct file_operations ptmx_fops;
799 static void __init unix98_pty_init(void)
801 ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX,
802 TTY_DRIVER_RESET_TERMIOS |
803 TTY_DRIVER_REAL_RAW |
804 TTY_DRIVER_DYNAMIC_DEV |
805 TTY_DRIVER_DEVPTS_MEM |
806 TTY_DRIVER_DYNAMIC_ALLOC);
807 if (IS_ERR(ptm_driver))
808 panic("Couldn't allocate Unix98 ptm driver");
809 pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX,
810 TTY_DRIVER_RESET_TERMIOS |
811 TTY_DRIVER_REAL_RAW |
812 TTY_DRIVER_DYNAMIC_DEV |
813 TTY_DRIVER_DEVPTS_MEM |
814 TTY_DRIVER_DYNAMIC_ALLOC);
815 if (IS_ERR(pts_driver))
816 panic("Couldn't allocate Unix98 pts driver");
818 ptm_driver->driver_name = "pty_master";
819 ptm_driver->name = "ptm";
820 ptm_driver->major = UNIX98_PTY_MASTER_MAJOR;
821 ptm_driver->minor_start = 0;
822 ptm_driver->type = TTY_DRIVER_TYPE_PTY;
823 ptm_driver->subtype = PTY_TYPE_MASTER;
824 ptm_driver->init_termios = tty_std_termios;
825 ptm_driver->init_termios.c_iflag = 0;
826 ptm_driver->init_termios.c_oflag = 0;
827 ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
828 ptm_driver->init_termios.c_lflag = 0;
829 ptm_driver->init_termios.c_ispeed = 38400;
830 ptm_driver->init_termios.c_ospeed = 38400;
831 ptm_driver->other = pts_driver;
832 tty_set_operations(ptm_driver, &ptm_unix98_ops);
834 pts_driver->driver_name = "pty_slave";
835 pts_driver->name = "pts";
836 pts_driver->major = UNIX98_PTY_SLAVE_MAJOR;
837 pts_driver->minor_start = 0;
838 pts_driver->type = TTY_DRIVER_TYPE_PTY;
839 pts_driver->subtype = PTY_TYPE_SLAVE;
840 pts_driver->init_termios = tty_std_termios;
841 pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
842 pts_driver->init_termios.c_ispeed = 38400;
843 pts_driver->init_termios.c_ospeed = 38400;
844 pts_driver->other = ptm_driver;
845 tty_set_operations(pts_driver, &pty_unix98_ops);
847 if (tty_register_driver(ptm_driver))
848 panic("Couldn't register Unix98 ptm driver");
849 if (tty_register_driver(pts_driver))
850 panic("Couldn't register Unix98 pts driver");
852 /* Now create the /dev/ptmx special device */
853 tty_default_fops(&ptmx_fops);
854 ptmx_fops.open = ptmx_open;
856 cdev_init(&ptmx_cdev, &ptmx_fops);
857 if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) ||
858 register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0)
859 panic("Couldn't register /dev/ptmx driver");
860 device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx");
864 static inline void unix98_pty_init(void) { }
867 static int __init pty_init(void)
873 module_init(pty_init);