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 set_bit(TTY_OTHER_CLOSED, &tty->link->flags);
57 wake_up_interruptible(&tty->link->read_wait);
58 wake_up_interruptible(&tty->link->write_wait);
59 if (tty->driver->subtype == PTY_TYPE_MASTER) {
60 set_bit(TTY_OTHER_CLOSED, &tty->flags);
61 #ifdef CONFIG_UNIX98_PTYS
62 if (tty->driver == ptm_driver) {
63 mutex_lock(&devpts_mutex);
64 if (tty->link->driver_data)
65 devpts_pty_kill(tty->link->driver_data);
66 mutex_unlock(&devpts_mutex);
69 tty_vhangup(tty->link);
74 * The unthrottle routine is called by the line discipline to signal
75 * that it can receive more characters. For PTY's, the TTY_THROTTLED
76 * flag is always set, to force the line discipline to always call the
77 * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE
78 * characters in the queue. This is necessary since each time this
79 * happens, we need to wake up any sleeping processes that could be
80 * (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
81 * for the pty buffer to be drained.
83 static void pty_unthrottle(struct tty_struct *tty)
85 tty_wakeup(tty->link);
86 set_bit(TTY_THROTTLED, &tty->flags);
90 * pty_space - report space left for writing
91 * @to: tty we are writing into
93 * Limit the buffer space used by ptys to 8k.
96 static int pty_space(struct tty_struct *to)
98 int n = tty_buffer_space_avail(to->port);
103 * pty_write - write to a pty
104 * @tty: the tty we write from
105 * @buf: kernel buffer of data
106 * @count: bytes to write
108 * Our "hardware" write method. Data is coming from the ldisc which
109 * may be in a non sleeping state. We simply throw this at the other
110 * end of the link as if we were an IRQ handler receiving stuff for
111 * the other side of the pty/tty pair.
114 static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
116 struct tty_struct *to = tty->link;
122 /* Stuff the data into the input queue of the other end */
123 c = tty_insert_flip_string(to->port, buf, c);
126 tty_flip_buffer_push(to->port);
132 * pty_write_room - write space
133 * @tty: tty we are writing from
135 * Report how many bytes the ldisc can send into the queue for
139 static int pty_write_room(struct tty_struct *tty)
143 return pty_space(tty->link);
147 * pty_chars_in_buffer - characters currently in our tx queue
150 * Report how much we have in the transmit queue. As everything is
151 * instantly at the other end this is easy to implement.
154 static int pty_chars_in_buffer(struct tty_struct *tty)
159 /* Set the lock flag on a pty */
160 static int pty_set_lock(struct tty_struct *tty, int __user *arg)
163 if (get_user(val, arg))
166 set_bit(TTY_PTY_LOCK, &tty->flags);
168 clear_bit(TTY_PTY_LOCK, &tty->flags);
172 static int pty_get_lock(struct tty_struct *tty, int __user *arg)
174 int locked = test_bit(TTY_PTY_LOCK, &tty->flags);
175 return put_user(locked, arg);
178 /* Set the packet mode on a pty */
179 static int pty_set_pktmode(struct tty_struct *tty, int __user *arg)
183 if (get_user(pktmode, arg))
186 spin_lock_irq(&tty->ctrl_lock);
189 tty->link->ctrl_status = 0;
195 spin_unlock_irq(&tty->ctrl_lock);
200 /* Get the packet mode of a pty */
201 static int pty_get_pktmode(struct tty_struct *tty, int __user *arg)
203 int pktmode = tty->packet;
204 return put_user(pktmode, arg);
207 /* Send a signal to the slave */
208 static int pty_signal(struct tty_struct *tty, int sig)
213 pgrp = tty_get_pgrp(tty->link);
215 kill_pgrp(pgrp, sig, 1);
221 static void pty_flush_buffer(struct tty_struct *tty)
223 struct tty_struct *to = tty->link;
227 /* tty_buffer_flush(to); FIXME */
229 spin_lock_irq(&tty->ctrl_lock);
230 tty->ctrl_status |= TIOCPKT_FLUSHWRITE;
231 wake_up_interruptible(&to->read_wait);
232 spin_unlock_irq(&tty->ctrl_lock);
236 static int pty_open(struct tty_struct *tty, struct file *filp)
238 if (!tty || !tty->link)
241 if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
243 if (test_bit(TTY_PTY_LOCK, &tty->link->flags))
245 if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1)
248 clear_bit(TTY_IO_ERROR, &tty->flags);
249 clear_bit(TTY_OTHER_CLOSED, &tty->link->flags);
250 set_bit(TTY_THROTTLED, &tty->flags);
254 set_bit(TTY_IO_ERROR, &tty->flags);
258 static void pty_set_termios(struct tty_struct *tty,
259 struct ktermios *old_termios)
261 /* See if packet mode change of state. */
262 if (tty->link && tty->link->packet) {
263 int extproc = (old_termios->c_lflag & EXTPROC) |
264 (tty->termios.c_lflag & EXTPROC);
265 int old_flow = ((old_termios->c_iflag & IXON) &&
266 (old_termios->c_cc[VSTOP] == '\023') &&
267 (old_termios->c_cc[VSTART] == '\021'));
268 int new_flow = (I_IXON(tty) &&
269 STOP_CHAR(tty) == '\023' &&
270 START_CHAR(tty) == '\021');
271 if ((old_flow != new_flow) || extproc) {
272 spin_lock_irq(&tty->ctrl_lock);
273 if (old_flow != new_flow) {
274 tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
276 tty->ctrl_status |= TIOCPKT_DOSTOP;
278 tty->ctrl_status |= TIOCPKT_NOSTOP;
281 tty->ctrl_status |= TIOCPKT_IOCTL;
282 spin_unlock_irq(&tty->ctrl_lock);
283 wake_up_interruptible(&tty->link->read_wait);
287 tty->termios.c_cflag &= ~(CSIZE | PARENB);
288 tty->termios.c_cflag |= (CS8 | CREAD);
292 * pty_do_resize - resize event
293 * @tty: tty being resized
294 * @ws: window size being set.
296 * Update the termios variables and send the necessary signals to
297 * peform a terminal resize correctly
300 static int pty_resize(struct tty_struct *tty, struct winsize *ws)
302 struct pid *pgrp, *rpgrp;
303 struct tty_struct *pty = tty->link;
305 /* For a PTY we need to lock the tty side */
306 mutex_lock(&tty->winsize_mutex);
307 if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
310 /* Signal the foreground process group of both ptys */
311 pgrp = tty_get_pgrp(tty);
312 rpgrp = tty_get_pgrp(pty);
315 kill_pgrp(pgrp, SIGWINCH, 1);
316 if (rpgrp != pgrp && rpgrp)
317 kill_pgrp(rpgrp, SIGWINCH, 1);
323 pty->winsize = *ws; /* Never used so will go away soon */
325 mutex_unlock(&tty->winsize_mutex);
330 * pty_start - start() handler
331 * pty_stop - stop() handler
332 * @tty: tty being flow-controlled
334 * Propagates the TIOCPKT status to the master pty.
336 * NB: only the master pty can be in packet mode so only the slave
337 * needs start()/stop() handlers
339 static void pty_start(struct tty_struct *tty)
343 if (tty->link && tty->link->packet) {
344 spin_lock_irqsave(&tty->ctrl_lock, flags);
345 tty->ctrl_status &= ~TIOCPKT_STOP;
346 tty->ctrl_status |= TIOCPKT_START;
347 spin_unlock_irqrestore(&tty->ctrl_lock, flags);
348 wake_up_interruptible_poll(&tty->link->read_wait, POLLIN);
352 static void pty_stop(struct tty_struct *tty)
356 if (tty->link && tty->link->packet) {
357 spin_lock_irqsave(&tty->ctrl_lock, flags);
358 tty->ctrl_status &= ~TIOCPKT_START;
359 tty->ctrl_status |= TIOCPKT_STOP;
360 spin_unlock_irqrestore(&tty->ctrl_lock, flags);
361 wake_up_interruptible_poll(&tty->link->read_wait, POLLIN);
366 * pty_common_install - set up the pty pair
367 * @driver: the pty driver
368 * @tty: the tty being instantiated
369 * @legacy: true if this is BSD style
371 * Perform the initial set up for the tty/pty pair. Called from the
372 * tty layer when the port is first opened.
374 * Locking: the caller must hold the tty_mutex
376 static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty,
379 struct tty_struct *o_tty;
380 struct tty_port *ports[2];
381 int idx = tty->index;
382 int retval = -ENOMEM;
384 /* Opening the slave first has always returned -EIO */
385 if (driver->subtype != PTY_TYPE_MASTER)
388 ports[0] = kmalloc(sizeof **ports, GFP_KERNEL);
389 ports[1] = kmalloc(sizeof **ports, GFP_KERNEL);
390 if (!ports[0] || !ports[1])
392 if (!try_module_get(driver->other->owner)) {
393 /* This cannot in fact currently happen */
396 o_tty = alloc_tty_struct(driver->other, idx);
400 tty_set_lock_subclass(o_tty);
403 /* We always use new tty termios data so we can do this
405 retval = tty_init_termios(tty);
409 retval = tty_init_termios(o_tty);
411 goto err_free_termios;
413 driver->other->ttys[idx] = o_tty;
414 driver->ttys[idx] = tty;
416 memset(&tty->termios_locked, 0, sizeof(tty->termios_locked));
417 tty->termios = driver->init_termios;
418 memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked));
419 o_tty->termios = driver->other->init_termios;
423 * Everything allocated ... set up the o_tty structure.
425 tty_driver_kref_get(driver->other);
426 /* Establish the links in both directions */
429 tty_port_init(ports[0]);
430 tty_port_init(ports[1]);
431 o_tty->port = ports[0];
432 tty->port = ports[1];
433 o_tty->port->itty = o_tty;
435 tty_driver_kref_get(driver);
441 tty_free_termios(tty);
443 deinitialize_tty_struct(o_tty);
444 free_tty_struct(o_tty);
446 module_put(driver->other->owner);
453 static void pty_cleanup(struct tty_struct *tty)
455 tty_port_put(tty->port);
458 /* Traditional BSD devices */
459 #ifdef CONFIG_LEGACY_PTYS
461 static int pty_install(struct tty_driver *driver, struct tty_struct *tty)
463 return pty_common_install(driver, tty, true);
466 static void pty_remove(struct tty_driver *driver, struct tty_struct *tty)
468 struct tty_struct *pair = tty->link;
469 driver->ttys[tty->index] = NULL;
471 pair->driver->ttys[pair->index] = NULL;
474 static int pty_bsd_ioctl(struct tty_struct *tty,
475 unsigned int cmd, unsigned long arg)
478 case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
479 return pty_set_lock(tty, (int __user *) arg);
480 case TIOCGPTLCK: /* Get PT Lock status */
481 return pty_get_lock(tty, (int __user *)arg);
482 case TIOCPKT: /* Set PT packet mode */
483 return pty_set_pktmode(tty, (int __user *)arg);
484 case TIOCGPKT: /* Get PT packet mode */
485 return pty_get_pktmode(tty, (int __user *)arg);
486 case TIOCSIG: /* Send signal to other side of pty */
487 return pty_signal(tty, (int) arg);
488 case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */
494 static int legacy_count = CONFIG_LEGACY_PTY_COUNT;
495 module_param(legacy_count, int, 0);
498 * The master side of a pty can do TIOCSPTLCK and thus
501 static const struct tty_operations master_pty_ops_bsd = {
502 .install = pty_install,
506 .write_room = pty_write_room,
507 .flush_buffer = pty_flush_buffer,
508 .chars_in_buffer = pty_chars_in_buffer,
509 .unthrottle = pty_unthrottle,
510 .ioctl = pty_bsd_ioctl,
511 .cleanup = pty_cleanup,
512 .resize = pty_resize,
516 static const struct tty_operations slave_pty_ops_bsd = {
517 .install = pty_install,
521 .write_room = pty_write_room,
522 .flush_buffer = pty_flush_buffer,
523 .chars_in_buffer = pty_chars_in_buffer,
524 .unthrottle = pty_unthrottle,
525 .set_termios = pty_set_termios,
526 .cleanup = pty_cleanup,
527 .resize = pty_resize,
533 static void __init legacy_pty_init(void)
535 struct tty_driver *pty_driver, *pty_slave_driver;
537 if (legacy_count <= 0)
540 pty_driver = tty_alloc_driver(legacy_count,
541 TTY_DRIVER_RESET_TERMIOS |
542 TTY_DRIVER_REAL_RAW |
543 TTY_DRIVER_DYNAMIC_ALLOC);
544 if (IS_ERR(pty_driver))
545 panic("Couldn't allocate pty driver");
547 pty_slave_driver = tty_alloc_driver(legacy_count,
548 TTY_DRIVER_RESET_TERMIOS |
549 TTY_DRIVER_REAL_RAW |
550 TTY_DRIVER_DYNAMIC_ALLOC);
551 if (IS_ERR(pty_slave_driver))
552 panic("Couldn't allocate pty slave driver");
554 pty_driver->driver_name = "pty_master";
555 pty_driver->name = "pty";
556 pty_driver->major = PTY_MASTER_MAJOR;
557 pty_driver->minor_start = 0;
558 pty_driver->type = TTY_DRIVER_TYPE_PTY;
559 pty_driver->subtype = PTY_TYPE_MASTER;
560 pty_driver->init_termios = tty_std_termios;
561 pty_driver->init_termios.c_iflag = 0;
562 pty_driver->init_termios.c_oflag = 0;
563 pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
564 pty_driver->init_termios.c_lflag = 0;
565 pty_driver->init_termios.c_ispeed = 38400;
566 pty_driver->init_termios.c_ospeed = 38400;
567 pty_driver->other = pty_slave_driver;
568 tty_set_operations(pty_driver, &master_pty_ops_bsd);
570 pty_slave_driver->driver_name = "pty_slave";
571 pty_slave_driver->name = "ttyp";
572 pty_slave_driver->major = PTY_SLAVE_MAJOR;
573 pty_slave_driver->minor_start = 0;
574 pty_slave_driver->type = TTY_DRIVER_TYPE_PTY;
575 pty_slave_driver->subtype = PTY_TYPE_SLAVE;
576 pty_slave_driver->init_termios = tty_std_termios;
577 pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
578 pty_slave_driver->init_termios.c_ispeed = 38400;
579 pty_slave_driver->init_termios.c_ospeed = 38400;
580 pty_slave_driver->other = pty_driver;
581 tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd);
583 if (tty_register_driver(pty_driver))
584 panic("Couldn't register pty driver");
585 if (tty_register_driver(pty_slave_driver))
586 panic("Couldn't register pty slave driver");
589 static inline void legacy_pty_init(void) { }
593 #ifdef CONFIG_UNIX98_PTYS
595 static struct cdev ptmx_cdev;
597 static int pty_unix98_ioctl(struct tty_struct *tty,
598 unsigned int cmd, unsigned long arg)
601 case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
602 return pty_set_lock(tty, (int __user *)arg);
603 case TIOCGPTLCK: /* Get PT Lock status */
604 return pty_get_lock(tty, (int __user *)arg);
605 case TIOCPKT: /* Set PT packet mode */
606 return pty_set_pktmode(tty, (int __user *)arg);
607 case TIOCGPKT: /* Get PT packet mode */
608 return pty_get_pktmode(tty, (int __user *)arg);
609 case TIOCGPTN: /* Get PT Number */
610 return put_user(tty->index, (unsigned int __user *)arg);
611 case TIOCSIG: /* Send signal to other side of pty */
612 return pty_signal(tty, (int) arg);
619 * ptm_unix98_lookup - find a pty master
620 * @driver: ptm driver
623 * Look up a pty master device. Called under the tty_mutex for now.
624 * This provides our locking.
627 static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver,
628 struct inode *ptm_inode, int idx)
630 /* Master must be open via /dev/ptmx */
631 return ERR_PTR(-EIO);
635 * pts_unix98_lookup - find a pty slave
636 * @driver: pts driver
639 * Look up a pty master device. Called under the tty_mutex for now.
640 * This provides our locking for the tty pointer.
643 static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver,
644 struct inode *pts_inode, int idx)
646 struct tty_struct *tty;
648 mutex_lock(&devpts_mutex);
649 tty = devpts_get_priv(pts_inode);
650 mutex_unlock(&devpts_mutex);
651 /* Master must be open before slave */
653 return ERR_PTR(-EIO);
657 /* We have no need to install and remove our tty objects as devpts does all
660 static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty)
662 return pty_common_install(driver, tty, false);
665 static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
669 /* this is called once with whichever end is closed last */
670 static void pty_unix98_shutdown(struct tty_struct *tty)
672 devpts_kill_index(tty->driver_data, tty->index);
675 static const struct tty_operations ptm_unix98_ops = {
676 .lookup = ptm_unix98_lookup,
677 .install = pty_unix98_install,
678 .remove = pty_unix98_remove,
682 .write_room = pty_write_room,
683 .flush_buffer = pty_flush_buffer,
684 .chars_in_buffer = pty_chars_in_buffer,
685 .unthrottle = pty_unthrottle,
686 .ioctl = pty_unix98_ioctl,
687 .resize = pty_resize,
688 .shutdown = pty_unix98_shutdown,
689 .cleanup = pty_cleanup
692 static const struct tty_operations pty_unix98_ops = {
693 .lookup = pts_unix98_lookup,
694 .install = pty_unix98_install,
695 .remove = pty_unix98_remove,
699 .write_room = pty_write_room,
700 .flush_buffer = pty_flush_buffer,
701 .chars_in_buffer = pty_chars_in_buffer,
702 .unthrottle = pty_unthrottle,
703 .set_termios = pty_set_termios,
706 .shutdown = pty_unix98_shutdown,
707 .cleanup = pty_cleanup,
711 * ptmx_open - open a unix 98 pty master
712 * @inode: inode of device file
713 * @filp: file pointer to tty
715 * Allocate a unix98 pty master device from the ptmx driver.
717 * Locking: tty_mutex protects the init_dev work. tty->count should
719 * allocated_ptys_lock handles the list of free pty numbers
722 static int ptmx_open(struct inode *inode, struct file *filp)
724 struct tty_struct *tty;
725 struct inode *slave_inode;
729 nonseekable_open(inode, filp);
731 /* We refuse fsnotify events on ptmx, since it's a shared resource */
732 filp->f_mode |= FMODE_NONOTIFY;
734 retval = tty_alloc_file(filp);
738 /* find a device that is not in use. */
739 mutex_lock(&devpts_mutex);
740 index = devpts_new_index(inode);
743 mutex_unlock(&devpts_mutex);
747 mutex_unlock(&devpts_mutex);
749 mutex_lock(&tty_mutex);
750 tty = tty_init_dev(ptm_driver, index);
753 retval = PTR_ERR(tty);
757 /* The tty returned here is locked so we can safely
759 mutex_unlock(&tty_mutex);
761 set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
762 tty->driver_data = inode;
764 tty_add_file(tty, filp);
766 slave_inode = devpts_pty_new(inode,
767 MKDEV(UNIX98_PTY_SLAVE_MAJOR, index), index,
769 if (IS_ERR(slave_inode)) {
770 retval = PTR_ERR(slave_inode);
773 tty->link->driver_data = slave_inode;
775 retval = ptm_driver->ops->open(tty, filp);
783 tty_release(inode, filp);
786 mutex_unlock(&tty_mutex);
787 devpts_kill_index(inode, index);
793 static struct file_operations ptmx_fops;
795 static void __init unix98_pty_init(void)
797 ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX,
798 TTY_DRIVER_RESET_TERMIOS |
799 TTY_DRIVER_REAL_RAW |
800 TTY_DRIVER_DYNAMIC_DEV |
801 TTY_DRIVER_DEVPTS_MEM |
802 TTY_DRIVER_DYNAMIC_ALLOC);
803 if (IS_ERR(ptm_driver))
804 panic("Couldn't allocate Unix98 ptm driver");
805 pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX,
806 TTY_DRIVER_RESET_TERMIOS |
807 TTY_DRIVER_REAL_RAW |
808 TTY_DRIVER_DYNAMIC_DEV |
809 TTY_DRIVER_DEVPTS_MEM |
810 TTY_DRIVER_DYNAMIC_ALLOC);
811 if (IS_ERR(pts_driver))
812 panic("Couldn't allocate Unix98 pts driver");
814 ptm_driver->driver_name = "pty_master";
815 ptm_driver->name = "ptm";
816 ptm_driver->major = UNIX98_PTY_MASTER_MAJOR;
817 ptm_driver->minor_start = 0;
818 ptm_driver->type = TTY_DRIVER_TYPE_PTY;
819 ptm_driver->subtype = PTY_TYPE_MASTER;
820 ptm_driver->init_termios = tty_std_termios;
821 ptm_driver->init_termios.c_iflag = 0;
822 ptm_driver->init_termios.c_oflag = 0;
823 ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
824 ptm_driver->init_termios.c_lflag = 0;
825 ptm_driver->init_termios.c_ispeed = 38400;
826 ptm_driver->init_termios.c_ospeed = 38400;
827 ptm_driver->other = pts_driver;
828 tty_set_operations(ptm_driver, &ptm_unix98_ops);
830 pts_driver->driver_name = "pty_slave";
831 pts_driver->name = "pts";
832 pts_driver->major = UNIX98_PTY_SLAVE_MAJOR;
833 pts_driver->minor_start = 0;
834 pts_driver->type = TTY_DRIVER_TYPE_PTY;
835 pts_driver->subtype = PTY_TYPE_SLAVE;
836 pts_driver->init_termios = tty_std_termios;
837 pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
838 pts_driver->init_termios.c_ispeed = 38400;
839 pts_driver->init_termios.c_ospeed = 38400;
840 pts_driver->other = ptm_driver;
841 tty_set_operations(pts_driver, &pty_unix98_ops);
843 if (tty_register_driver(ptm_driver))
844 panic("Couldn't register Unix98 ptm driver");
845 if (tty_register_driver(pts_driver))
846 panic("Couldn't register Unix98 pts driver");
848 /* Now create the /dev/ptmx special device */
849 tty_default_fops(&ptmx_fops);
850 ptmx_fops.open = ptmx_open;
852 cdev_init(&ptmx_cdev, &ptmx_fops);
853 if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) ||
854 register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0)
855 panic("Couldn't register /dev/ptmx driver");
856 device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx");
860 static inline void unix98_pty_init(void) { }
863 static int __init pty_init(void)
869 module_init(pty_init);