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_write - write to a pty
92 * @tty: the tty we write from
93 * @buf: kernel buffer of data
94 * @count: bytes to write
96 * Our "hardware" write method. Data is coming from the ldisc which
97 * may be in a non sleeping state. We simply throw this at the other
98 * end of the link as if we were an IRQ handler receiving stuff for
99 * the other side of the pty/tty pair.
102 static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
104 struct tty_struct *to = tty->link;
110 /* Stuff the data into the input queue of the other end */
111 c = tty_insert_flip_string(to->port, buf, c);
114 tty_flip_buffer_push(to->port);
120 * pty_write_room - write space
121 * @tty: tty we are writing from
123 * Report how many bytes the ldisc can send into the queue for
127 static int pty_write_room(struct tty_struct *tty)
131 return tty_buffer_space_avail(tty->link->port);
135 * pty_chars_in_buffer - characters currently in our tx queue
138 * Report how much we have in the transmit queue. As everything is
139 * instantly at the other end this is easy to implement.
142 static int pty_chars_in_buffer(struct tty_struct *tty)
147 /* Set the lock flag on a pty */
148 static int pty_set_lock(struct tty_struct *tty, int __user *arg)
151 if (get_user(val, arg))
154 set_bit(TTY_PTY_LOCK, &tty->flags);
156 clear_bit(TTY_PTY_LOCK, &tty->flags);
160 static int pty_get_lock(struct tty_struct *tty, int __user *arg)
162 int locked = test_bit(TTY_PTY_LOCK, &tty->flags);
163 return put_user(locked, arg);
166 /* Set the packet mode on a pty */
167 static int pty_set_pktmode(struct tty_struct *tty, int __user *arg)
171 if (get_user(pktmode, arg))
174 spin_lock_irq(&tty->ctrl_lock);
177 tty->link->ctrl_status = 0;
183 spin_unlock_irq(&tty->ctrl_lock);
188 /* Get the packet mode of a pty */
189 static int pty_get_pktmode(struct tty_struct *tty, int __user *arg)
191 int pktmode = tty->packet;
192 return put_user(pktmode, arg);
195 /* Send a signal to the slave */
196 static int pty_signal(struct tty_struct *tty, int sig)
200 if (sig != SIGINT && sig != SIGQUIT && sig != SIGTSTP)
204 pgrp = tty_get_pgrp(tty->link);
206 kill_pgrp(pgrp, sig, 1);
212 static void pty_flush_buffer(struct tty_struct *tty)
214 struct tty_struct *to = tty->link;
215 struct tty_ldisc *ld;
220 ld = tty_ldisc_ref(to);
221 tty_buffer_flush(to, ld);
226 spin_lock_irq(&tty->ctrl_lock);
227 tty->ctrl_status |= TIOCPKT_FLUSHWRITE;
228 wake_up_interruptible(&to->read_wait);
229 spin_unlock_irq(&tty->ctrl_lock);
233 static int pty_open(struct tty_struct *tty, struct file *filp)
235 if (!tty || !tty->link)
238 if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
240 if (test_bit(TTY_PTY_LOCK, &tty->link->flags))
242 if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1)
245 clear_bit(TTY_IO_ERROR, &tty->flags);
246 clear_bit(TTY_OTHER_CLOSED, &tty->link->flags);
247 set_bit(TTY_THROTTLED, &tty->flags);
251 set_bit(TTY_IO_ERROR, &tty->flags);
255 static void pty_set_termios(struct tty_struct *tty,
256 struct ktermios *old_termios)
258 /* See if packet mode change of state. */
259 if (tty->link && tty->link->packet) {
260 int extproc = (old_termios->c_lflag & EXTPROC) |
261 (tty->termios.c_lflag & EXTPROC);
262 int old_flow = ((old_termios->c_iflag & IXON) &&
263 (old_termios->c_cc[VSTOP] == '\023') &&
264 (old_termios->c_cc[VSTART] == '\021'));
265 int new_flow = (I_IXON(tty) &&
266 STOP_CHAR(tty) == '\023' &&
267 START_CHAR(tty) == '\021');
268 if ((old_flow != new_flow) || extproc) {
269 spin_lock_irq(&tty->ctrl_lock);
270 if (old_flow != new_flow) {
271 tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
273 tty->ctrl_status |= TIOCPKT_DOSTOP;
275 tty->ctrl_status |= TIOCPKT_NOSTOP;
278 tty->ctrl_status |= TIOCPKT_IOCTL;
279 spin_unlock_irq(&tty->ctrl_lock);
280 wake_up_interruptible(&tty->link->read_wait);
284 tty->termios.c_cflag &= ~(CSIZE | PARENB);
285 tty->termios.c_cflag |= (CS8 | CREAD);
289 * pty_do_resize - resize event
290 * @tty: tty being resized
291 * @ws: window size being set.
293 * Update the termios variables and send the necessary signals to
294 * peform a terminal resize correctly
297 static int pty_resize(struct tty_struct *tty, struct winsize *ws)
299 struct pid *pgrp, *rpgrp;
300 struct tty_struct *pty = tty->link;
302 /* For a PTY we need to lock the tty side */
303 mutex_lock(&tty->winsize_mutex);
304 if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
307 /* Signal the foreground process group of both ptys */
308 pgrp = tty_get_pgrp(tty);
309 rpgrp = tty_get_pgrp(pty);
312 kill_pgrp(pgrp, SIGWINCH, 1);
313 if (rpgrp != pgrp && rpgrp)
314 kill_pgrp(rpgrp, SIGWINCH, 1);
320 pty->winsize = *ws; /* Never used so will go away soon */
322 mutex_unlock(&tty->winsize_mutex);
327 * pty_start - start() handler
328 * pty_stop - stop() handler
329 * @tty: tty being flow-controlled
331 * Propagates the TIOCPKT status to the master pty.
333 * NB: only the master pty can be in packet mode so only the slave
334 * needs start()/stop() handlers
336 static void pty_start(struct tty_struct *tty)
340 if (tty->link && tty->link->packet) {
341 spin_lock_irqsave(&tty->ctrl_lock, flags);
342 tty->ctrl_status &= ~TIOCPKT_STOP;
343 tty->ctrl_status |= TIOCPKT_START;
344 spin_unlock_irqrestore(&tty->ctrl_lock, flags);
345 wake_up_interruptible_poll(&tty->link->read_wait, POLLIN);
349 static void pty_stop(struct tty_struct *tty)
353 if (tty->link && tty->link->packet) {
354 spin_lock_irqsave(&tty->ctrl_lock, flags);
355 tty->ctrl_status &= ~TIOCPKT_START;
356 tty->ctrl_status |= TIOCPKT_STOP;
357 spin_unlock_irqrestore(&tty->ctrl_lock, flags);
358 wake_up_interruptible_poll(&tty->link->read_wait, POLLIN);
363 * pty_common_install - set up the pty pair
364 * @driver: the pty driver
365 * @tty: the tty being instantiated
366 * @legacy: true if this is BSD style
368 * Perform the initial set up for the tty/pty pair. Called from the
369 * tty layer when the port is first opened.
371 * Locking: the caller must hold the tty_mutex
373 static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty,
376 struct tty_struct *o_tty;
377 struct tty_port *ports[2];
378 int idx = tty->index;
379 int retval = -ENOMEM;
381 /* Opening the slave first has always returned -EIO */
382 if (driver->subtype != PTY_TYPE_MASTER)
385 ports[0] = kmalloc(sizeof **ports, GFP_KERNEL);
386 ports[1] = kmalloc(sizeof **ports, GFP_KERNEL);
387 if (!ports[0] || !ports[1])
389 if (!try_module_get(driver->other->owner)) {
390 /* This cannot in fact currently happen */
393 o_tty = alloc_tty_struct(driver->other, idx);
397 tty_set_lock_subclass(o_tty);
400 /* We always use new tty termios data so we can do this
402 retval = tty_init_termios(tty);
406 retval = tty_init_termios(o_tty);
408 goto err_free_termios;
410 driver->other->ttys[idx] = o_tty;
411 driver->ttys[idx] = tty;
413 memset(&tty->termios_locked, 0, sizeof(tty->termios_locked));
414 tty->termios = driver->init_termios;
415 memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked));
416 o_tty->termios = driver->other->init_termios;
420 * Everything allocated ... set up the o_tty structure.
422 tty_driver_kref_get(driver->other);
423 /* Establish the links in both directions */
426 tty_port_init(ports[0]);
427 tty_port_init(ports[1]);
428 tty_buffer_set_limit(ports[0], 8192);
429 tty_buffer_set_limit(ports[1], 8192);
430 o_tty->port = ports[0];
431 tty->port = ports[1];
432 o_tty->port->itty = o_tty;
434 tty_buffer_set_lock_subclass(o_tty->port);
436 tty_driver_kref_get(driver);
442 tty_free_termios(tty);
444 deinitialize_tty_struct(o_tty);
445 free_tty_struct(o_tty);
447 module_put(driver->other->owner);
454 static void pty_cleanup(struct tty_struct *tty)
456 tty_port_put(tty->port);
459 /* Traditional BSD devices */
460 #ifdef CONFIG_LEGACY_PTYS
462 static int pty_install(struct tty_driver *driver, struct tty_struct *tty)
464 return pty_common_install(driver, tty, true);
467 static void pty_remove(struct tty_driver *driver, struct tty_struct *tty)
469 struct tty_struct *pair = tty->link;
470 driver->ttys[tty->index] = NULL;
472 pair->driver->ttys[pair->index] = NULL;
475 static int pty_bsd_ioctl(struct tty_struct *tty,
476 unsigned int cmd, unsigned long arg)
479 case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
480 return pty_set_lock(tty, (int __user *) arg);
481 case TIOCGPTLCK: /* Get PT Lock status */
482 return pty_get_lock(tty, (int __user *)arg);
483 case TIOCPKT: /* Set PT packet mode */
484 return pty_set_pktmode(tty, (int __user *)arg);
485 case TIOCGPKT: /* Get PT packet mode */
486 return pty_get_pktmode(tty, (int __user *)arg);
487 case TIOCSIG: /* Send signal to other side of pty */
488 return pty_signal(tty, (int) arg);
489 case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */
495 static int legacy_count = CONFIG_LEGACY_PTY_COUNT;
496 module_param(legacy_count, int, 0);
499 * The master side of a pty can do TIOCSPTLCK and thus
502 static const struct tty_operations master_pty_ops_bsd = {
503 .install = pty_install,
507 .write_room = pty_write_room,
508 .flush_buffer = pty_flush_buffer,
509 .chars_in_buffer = pty_chars_in_buffer,
510 .unthrottle = pty_unthrottle,
511 .ioctl = pty_bsd_ioctl,
512 .cleanup = pty_cleanup,
513 .resize = pty_resize,
517 static const struct tty_operations slave_pty_ops_bsd = {
518 .install = pty_install,
522 .write_room = pty_write_room,
523 .flush_buffer = pty_flush_buffer,
524 .chars_in_buffer = pty_chars_in_buffer,
525 .unthrottle = pty_unthrottle,
526 .set_termios = pty_set_termios,
527 .cleanup = pty_cleanup,
528 .resize = pty_resize,
534 static void __init legacy_pty_init(void)
536 struct tty_driver *pty_driver, *pty_slave_driver;
538 if (legacy_count <= 0)
541 pty_driver = tty_alloc_driver(legacy_count,
542 TTY_DRIVER_RESET_TERMIOS |
543 TTY_DRIVER_REAL_RAW |
544 TTY_DRIVER_DYNAMIC_ALLOC);
545 if (IS_ERR(pty_driver))
546 panic("Couldn't allocate pty driver");
548 pty_slave_driver = tty_alloc_driver(legacy_count,
549 TTY_DRIVER_RESET_TERMIOS |
550 TTY_DRIVER_REAL_RAW |
551 TTY_DRIVER_DYNAMIC_ALLOC);
552 if (IS_ERR(pty_slave_driver))
553 panic("Couldn't allocate pty slave driver");
555 pty_driver->driver_name = "pty_master";
556 pty_driver->name = "pty";
557 pty_driver->major = PTY_MASTER_MAJOR;
558 pty_driver->minor_start = 0;
559 pty_driver->type = TTY_DRIVER_TYPE_PTY;
560 pty_driver->subtype = PTY_TYPE_MASTER;
561 pty_driver->init_termios = tty_std_termios;
562 pty_driver->init_termios.c_iflag = 0;
563 pty_driver->init_termios.c_oflag = 0;
564 pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
565 pty_driver->init_termios.c_lflag = 0;
566 pty_driver->init_termios.c_ispeed = 38400;
567 pty_driver->init_termios.c_ospeed = 38400;
568 pty_driver->other = pty_slave_driver;
569 tty_set_operations(pty_driver, &master_pty_ops_bsd);
571 pty_slave_driver->driver_name = "pty_slave";
572 pty_slave_driver->name = "ttyp";
573 pty_slave_driver->major = PTY_SLAVE_MAJOR;
574 pty_slave_driver->minor_start = 0;
575 pty_slave_driver->type = TTY_DRIVER_TYPE_PTY;
576 pty_slave_driver->subtype = PTY_TYPE_SLAVE;
577 pty_slave_driver->init_termios = tty_std_termios;
578 pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
579 pty_slave_driver->init_termios.c_ispeed = 38400;
580 pty_slave_driver->init_termios.c_ospeed = 38400;
581 pty_slave_driver->other = pty_driver;
582 tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd);
584 if (tty_register_driver(pty_driver))
585 panic("Couldn't register pty driver");
586 if (tty_register_driver(pty_slave_driver))
587 panic("Couldn't register pty slave driver");
590 static inline void legacy_pty_init(void) { }
594 #ifdef CONFIG_UNIX98_PTYS
596 static struct cdev ptmx_cdev;
598 static int pty_unix98_ioctl(struct tty_struct *tty,
599 unsigned int cmd, unsigned long arg)
602 case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
603 return pty_set_lock(tty, (int __user *)arg);
604 case TIOCGPTLCK: /* Get PT Lock status */
605 return pty_get_lock(tty, (int __user *)arg);
606 case TIOCPKT: /* Set PT packet mode */
607 return pty_set_pktmode(tty, (int __user *)arg);
608 case TIOCGPKT: /* Get PT packet mode */
609 return pty_get_pktmode(tty, (int __user *)arg);
610 case TIOCGPTN: /* Get PT Number */
611 return put_user(tty->index, (unsigned int __user *)arg);
612 case TIOCSIG: /* Send signal to other side of pty */
613 return pty_signal(tty, (int) arg);
620 * ptm_unix98_lookup - find a pty master
621 * @driver: ptm driver
624 * Look up a pty master device. Called under the tty_mutex for now.
625 * This provides our locking.
628 static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver,
629 struct inode *ptm_inode, int idx)
631 /* Master must be open via /dev/ptmx */
632 return ERR_PTR(-EIO);
636 * pts_unix98_lookup - find a pty slave
637 * @driver: pts driver
640 * Look up a pty master device. Called under the tty_mutex for now.
641 * This provides our locking for the tty pointer.
644 static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver,
645 struct inode *pts_inode, int idx)
647 struct tty_struct *tty;
649 mutex_lock(&devpts_mutex);
650 tty = devpts_get_priv(pts_inode);
651 mutex_unlock(&devpts_mutex);
652 /* Master must be open before slave */
654 return ERR_PTR(-EIO);
658 /* We have no need to install and remove our tty objects as devpts does all
661 static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty)
663 return pty_common_install(driver, tty, false);
666 static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
670 /* this is called once with whichever end is closed last */
671 static void pty_unix98_shutdown(struct tty_struct *tty)
673 devpts_kill_index(tty->driver_data, tty->index);
676 static const struct tty_operations ptm_unix98_ops = {
677 .lookup = ptm_unix98_lookup,
678 .install = pty_unix98_install,
679 .remove = pty_unix98_remove,
683 .write_room = pty_write_room,
684 .flush_buffer = pty_flush_buffer,
685 .chars_in_buffer = pty_chars_in_buffer,
686 .unthrottle = pty_unthrottle,
687 .ioctl = pty_unix98_ioctl,
688 .resize = pty_resize,
689 .shutdown = pty_unix98_shutdown,
690 .cleanup = pty_cleanup
693 static const struct tty_operations pty_unix98_ops = {
694 .lookup = pts_unix98_lookup,
695 .install = pty_unix98_install,
696 .remove = pty_unix98_remove,
700 .write_room = pty_write_room,
701 .flush_buffer = pty_flush_buffer,
702 .chars_in_buffer = pty_chars_in_buffer,
703 .unthrottle = pty_unthrottle,
704 .set_termios = pty_set_termios,
707 .shutdown = pty_unix98_shutdown,
708 .cleanup = pty_cleanup,
712 * ptmx_open - open a unix 98 pty master
713 * @inode: inode of device file
714 * @filp: file pointer to tty
716 * Allocate a unix98 pty master device from the ptmx driver.
718 * Locking: tty_mutex protects the init_dev work. tty->count should
720 * allocated_ptys_lock handles the list of free pty numbers
723 static int ptmx_open(struct inode *inode, struct file *filp)
725 struct tty_struct *tty;
726 struct inode *slave_inode;
730 nonseekable_open(inode, filp);
732 /* We refuse fsnotify events on ptmx, since it's a shared resource */
733 filp->f_mode |= FMODE_NONOTIFY;
735 retval = tty_alloc_file(filp);
739 /* find a device that is not in use. */
740 mutex_lock(&devpts_mutex);
741 index = devpts_new_index(inode);
744 mutex_unlock(&devpts_mutex);
748 mutex_unlock(&devpts_mutex);
750 mutex_lock(&tty_mutex);
751 tty = tty_init_dev(ptm_driver, index);
754 retval = PTR_ERR(tty);
758 /* The tty returned here is locked so we can safely
760 mutex_unlock(&tty_mutex);
762 set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
763 tty->driver_data = inode;
765 tty_add_file(tty, filp);
767 slave_inode = devpts_pty_new(inode,
768 MKDEV(UNIX98_PTY_SLAVE_MAJOR, index), index,
770 if (IS_ERR(slave_inode)) {
771 retval = PTR_ERR(slave_inode);
774 tty->link->driver_data = slave_inode;
776 retval = ptm_driver->ops->open(tty, filp);
784 tty_release(inode, filp);
787 mutex_unlock(&tty_mutex);
788 devpts_kill_index(inode, index);
794 static struct file_operations ptmx_fops;
796 static void __init unix98_pty_init(void)
798 ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX,
799 TTY_DRIVER_RESET_TERMIOS |
800 TTY_DRIVER_REAL_RAW |
801 TTY_DRIVER_DYNAMIC_DEV |
802 TTY_DRIVER_DEVPTS_MEM |
803 TTY_DRIVER_DYNAMIC_ALLOC);
804 if (IS_ERR(ptm_driver))
805 panic("Couldn't allocate Unix98 ptm driver");
806 pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX,
807 TTY_DRIVER_RESET_TERMIOS |
808 TTY_DRIVER_REAL_RAW |
809 TTY_DRIVER_DYNAMIC_DEV |
810 TTY_DRIVER_DEVPTS_MEM |
811 TTY_DRIVER_DYNAMIC_ALLOC);
812 if (IS_ERR(pts_driver))
813 panic("Couldn't allocate Unix98 pts driver");
815 ptm_driver->driver_name = "pty_master";
816 ptm_driver->name = "ptm";
817 ptm_driver->major = UNIX98_PTY_MASTER_MAJOR;
818 ptm_driver->minor_start = 0;
819 ptm_driver->type = TTY_DRIVER_TYPE_PTY;
820 ptm_driver->subtype = PTY_TYPE_MASTER;
821 ptm_driver->init_termios = tty_std_termios;
822 ptm_driver->init_termios.c_iflag = 0;
823 ptm_driver->init_termios.c_oflag = 0;
824 ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
825 ptm_driver->init_termios.c_lflag = 0;
826 ptm_driver->init_termios.c_ispeed = 38400;
827 ptm_driver->init_termios.c_ospeed = 38400;
828 ptm_driver->other = pts_driver;
829 tty_set_operations(ptm_driver, &ptm_unix98_ops);
831 pts_driver->driver_name = "pty_slave";
832 pts_driver->name = "pts";
833 pts_driver->major = UNIX98_PTY_SLAVE_MAJOR;
834 pts_driver->minor_start = 0;
835 pts_driver->type = TTY_DRIVER_TYPE_PTY;
836 pts_driver->subtype = PTY_TYPE_SLAVE;
837 pts_driver->init_termios = tty_std_termios;
838 pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
839 pts_driver->init_termios.c_ispeed = 38400;
840 pts_driver->init_termios.c_ospeed = 38400;
841 pts_driver->other = ptm_driver;
842 tty_set_operations(pts_driver, &pty_unix98_ops);
844 if (tty_register_driver(ptm_driver))
845 panic("Couldn't register Unix98 ptm driver");
846 if (tty_register_driver(pts_driver))
847 panic("Couldn't register Unix98 pts driver");
849 /* Now create the /dev/ptmx special device */
850 tty_default_fops(&ptmx_fops);
851 ptmx_fops.open = ptmx_open;
853 cdev_init(&ptmx_cdev, &ptmx_fops);
854 if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) ||
855 register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0)
856 panic("Couldn't register /dev/ptmx driver");
857 device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx");
861 static inline void unix98_pty_init(void) { }
864 static int __init pty_init(void)
870 module_init(pty_init);