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>
29 #undef TTY_DEBUG_HANGUP
30 #ifdef TTY_DEBUG_HANGUP
31 # define tty_debug_hangup(tty, f, args...) tty_debug(tty, f, ##args)
33 # define tty_debug_hangup(tty, f, args...) do {} while (0)
36 #ifdef CONFIG_UNIX98_PTYS
37 static struct tty_driver *ptm_driver;
38 static struct tty_driver *pts_driver;
39 static DEFINE_MUTEX(devpts_mutex);
42 static void pty_close(struct tty_struct *tty, struct file *filp)
45 if (tty->driver->subtype == PTY_TYPE_MASTER)
46 WARN_ON(tty->count > 1);
48 if (test_bit(TTY_IO_ERROR, &tty->flags))
53 set_bit(TTY_IO_ERROR, &tty->flags);
54 wake_up_interruptible(&tty->read_wait);
55 wake_up_interruptible(&tty->write_wait);
56 spin_lock_irq(&tty->ctrl_lock);
58 spin_unlock_irq(&tty->ctrl_lock);
59 /* Review - krefs on tty_link ?? */
62 set_bit(TTY_OTHER_CLOSED, &tty->link->flags);
63 tty_flip_buffer_push(tty->link->port);
64 wake_up_interruptible(&tty->link->write_wait);
65 if (tty->driver->subtype == PTY_TYPE_MASTER) {
66 set_bit(TTY_OTHER_CLOSED, &tty->flags);
67 #ifdef CONFIG_UNIX98_PTYS
68 if (tty->driver == ptm_driver) {
69 mutex_lock(&devpts_mutex);
70 if (tty->link->driver_data)
71 devpts_pty_kill(tty->link->driver_data);
72 mutex_unlock(&devpts_mutex);
75 tty_vhangup(tty->link);
80 * The unthrottle routine is called by the line discipline to signal
81 * that it can receive more characters. For PTY's, the TTY_THROTTLED
82 * flag is always set, to force the line discipline to always call the
83 * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE
84 * characters in the queue. This is necessary since each time this
85 * happens, we need to wake up any sleeping processes that could be
86 * (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
87 * for the pty buffer to be drained.
89 static void pty_unthrottle(struct tty_struct *tty)
91 tty_wakeup(tty->link);
92 set_bit(TTY_THROTTLED, &tty->flags);
96 * pty_write - write to a pty
97 * @tty: the tty we write from
98 * @buf: kernel buffer of data
99 * @count: bytes to write
101 * Our "hardware" write method. Data is coming from the ldisc which
102 * may be in a non sleeping state. We simply throw this at the other
103 * end of the link as if we were an IRQ handler receiving stuff for
104 * the other side of the pty/tty pair.
107 static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
109 struct tty_struct *to = tty->link;
115 /* Stuff the data into the input queue of the other end */
116 c = tty_insert_flip_string(to->port, buf, c);
119 tty_flip_buffer_push(to->port);
125 * pty_write_room - write space
126 * @tty: tty we are writing from
128 * Report how many bytes the ldisc can send into the queue for
132 static int pty_write_room(struct tty_struct *tty)
136 return tty_buffer_space_avail(tty->link->port);
140 * pty_chars_in_buffer - characters currently in our tx queue
143 * Report how much we have in the transmit queue. As everything is
144 * instantly at the other end this is easy to implement.
147 static int pty_chars_in_buffer(struct tty_struct *tty)
152 /* Set the lock flag on a pty */
153 static int pty_set_lock(struct tty_struct *tty, int __user *arg)
156 if (get_user(val, arg))
159 set_bit(TTY_PTY_LOCK, &tty->flags);
161 clear_bit(TTY_PTY_LOCK, &tty->flags);
165 static int pty_get_lock(struct tty_struct *tty, int __user *arg)
167 int locked = test_bit(TTY_PTY_LOCK, &tty->flags);
168 return put_user(locked, arg);
171 /* Set the packet mode on a pty */
172 static int pty_set_pktmode(struct tty_struct *tty, int __user *arg)
176 if (get_user(pktmode, arg))
179 spin_lock_irq(&tty->ctrl_lock);
182 tty->link->ctrl_status = 0;
188 spin_unlock_irq(&tty->ctrl_lock);
193 /* Get the packet mode of a pty */
194 static int pty_get_pktmode(struct tty_struct *tty, int __user *arg)
196 int pktmode = tty->packet;
197 return put_user(pktmode, arg);
200 /* Send a signal to the slave */
201 static int pty_signal(struct tty_struct *tty, int sig)
205 if (sig != SIGINT && sig != SIGQUIT && sig != SIGTSTP)
209 pgrp = tty_get_pgrp(tty->link);
211 kill_pgrp(pgrp, sig, 1);
217 static void pty_flush_buffer(struct tty_struct *tty)
219 struct tty_struct *to = tty->link;
220 struct tty_ldisc *ld;
225 ld = tty_ldisc_ref(to);
226 tty_buffer_flush(to, ld);
231 spin_lock_irq(&tty->ctrl_lock);
232 tty->ctrl_status |= TIOCPKT_FLUSHWRITE;
233 wake_up_interruptible(&to->read_wait);
234 spin_unlock_irq(&tty->ctrl_lock);
238 static int pty_open(struct tty_struct *tty, struct file *filp)
240 if (!tty || !tty->link)
243 if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
245 if (test_bit(TTY_PTY_LOCK, &tty->link->flags))
247 if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1)
250 clear_bit(TTY_IO_ERROR, &tty->flags);
251 /* TTY_OTHER_CLOSED must be cleared before TTY_OTHER_DONE */
252 clear_bit(TTY_OTHER_CLOSED, &tty->link->flags);
253 clear_bit(TTY_OTHER_DONE, &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);
405 lockdep_set_subclass(&o_tty->termios_rwsem, TTY_LOCK_SLAVE);
408 /* We always use new tty termios data so we can do this
410 retval = tty_init_termios(tty);
414 retval = tty_init_termios(o_tty);
416 goto err_free_termios;
418 driver->other->ttys[idx] = o_tty;
419 driver->ttys[idx] = tty;
421 memset(&tty->termios_locked, 0, sizeof(tty->termios_locked));
422 tty->termios = driver->init_termios;
423 memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked));
424 o_tty->termios = driver->other->init_termios;
428 * Everything allocated ... set up the o_tty structure.
430 tty_driver_kref_get(driver->other);
431 /* Establish the links in both directions */
434 tty_port_init(ports[0]);
435 tty_port_init(ports[1]);
436 tty_buffer_set_limit(ports[0], 8192);
437 tty_buffer_set_limit(ports[1], 8192);
438 o_tty->port = ports[0];
439 tty->port = ports[1];
440 o_tty->port->itty = o_tty;
442 tty_buffer_set_lock_subclass(o_tty->port);
444 tty_driver_kref_get(driver);
450 tty_free_termios(tty);
452 deinitialize_tty_struct(o_tty);
453 free_tty_struct(o_tty);
455 module_put(driver->other->owner);
462 static void pty_cleanup(struct tty_struct *tty)
464 tty_port_put(tty->port);
467 /* Traditional BSD devices */
468 #ifdef CONFIG_LEGACY_PTYS
470 static int pty_install(struct tty_driver *driver, struct tty_struct *tty)
472 return pty_common_install(driver, tty, true);
475 static void pty_remove(struct tty_driver *driver, struct tty_struct *tty)
477 struct tty_struct *pair = tty->link;
478 driver->ttys[tty->index] = NULL;
480 pair->driver->ttys[pair->index] = NULL;
483 static int pty_bsd_ioctl(struct tty_struct *tty,
484 unsigned int cmd, unsigned long arg)
487 case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
488 return pty_set_lock(tty, (int __user *) arg);
489 case TIOCGPTLCK: /* Get PT Lock status */
490 return pty_get_lock(tty, (int __user *)arg);
491 case TIOCPKT: /* Set PT packet mode */
492 return pty_set_pktmode(tty, (int __user *)arg);
493 case TIOCGPKT: /* Get PT packet mode */
494 return pty_get_pktmode(tty, (int __user *)arg);
495 case TIOCSIG: /* Send signal to other side of pty */
496 return pty_signal(tty, (int) arg);
497 case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */
503 static int legacy_count = CONFIG_LEGACY_PTY_COUNT;
504 module_param(legacy_count, int, 0);
507 * The master side of a pty can do TIOCSPTLCK and thus
510 static const struct tty_operations master_pty_ops_bsd = {
511 .install = pty_install,
515 .write_room = pty_write_room,
516 .flush_buffer = pty_flush_buffer,
517 .chars_in_buffer = pty_chars_in_buffer,
518 .unthrottle = pty_unthrottle,
519 .ioctl = pty_bsd_ioctl,
520 .cleanup = pty_cleanup,
521 .resize = pty_resize,
525 static const struct tty_operations slave_pty_ops_bsd = {
526 .install = pty_install,
530 .write_room = pty_write_room,
531 .flush_buffer = pty_flush_buffer,
532 .chars_in_buffer = pty_chars_in_buffer,
533 .unthrottle = pty_unthrottle,
534 .set_termios = pty_set_termios,
535 .cleanup = pty_cleanup,
536 .resize = pty_resize,
542 static void __init legacy_pty_init(void)
544 struct tty_driver *pty_driver, *pty_slave_driver;
546 if (legacy_count <= 0)
549 pty_driver = tty_alloc_driver(legacy_count,
550 TTY_DRIVER_RESET_TERMIOS |
551 TTY_DRIVER_REAL_RAW |
552 TTY_DRIVER_DYNAMIC_ALLOC);
553 if (IS_ERR(pty_driver))
554 panic("Couldn't allocate pty driver");
556 pty_slave_driver = tty_alloc_driver(legacy_count,
557 TTY_DRIVER_RESET_TERMIOS |
558 TTY_DRIVER_REAL_RAW |
559 TTY_DRIVER_DYNAMIC_ALLOC);
560 if (IS_ERR(pty_slave_driver))
561 panic("Couldn't allocate pty slave driver");
563 pty_driver->driver_name = "pty_master";
564 pty_driver->name = "pty";
565 pty_driver->major = PTY_MASTER_MAJOR;
566 pty_driver->minor_start = 0;
567 pty_driver->type = TTY_DRIVER_TYPE_PTY;
568 pty_driver->subtype = PTY_TYPE_MASTER;
569 pty_driver->init_termios = tty_std_termios;
570 pty_driver->init_termios.c_iflag = 0;
571 pty_driver->init_termios.c_oflag = 0;
572 pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
573 pty_driver->init_termios.c_lflag = 0;
574 pty_driver->init_termios.c_ispeed = 38400;
575 pty_driver->init_termios.c_ospeed = 38400;
576 pty_driver->other = pty_slave_driver;
577 tty_set_operations(pty_driver, &master_pty_ops_bsd);
579 pty_slave_driver->driver_name = "pty_slave";
580 pty_slave_driver->name = "ttyp";
581 pty_slave_driver->major = PTY_SLAVE_MAJOR;
582 pty_slave_driver->minor_start = 0;
583 pty_slave_driver->type = TTY_DRIVER_TYPE_PTY;
584 pty_slave_driver->subtype = PTY_TYPE_SLAVE;
585 pty_slave_driver->init_termios = tty_std_termios;
586 pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
587 pty_slave_driver->init_termios.c_ispeed = 38400;
588 pty_slave_driver->init_termios.c_ospeed = 38400;
589 pty_slave_driver->other = pty_driver;
590 tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd);
592 if (tty_register_driver(pty_driver))
593 panic("Couldn't register pty driver");
594 if (tty_register_driver(pty_slave_driver))
595 panic("Couldn't register pty slave driver");
598 static inline void legacy_pty_init(void) { }
602 #ifdef CONFIG_UNIX98_PTYS
604 static struct cdev ptmx_cdev;
606 static int pty_unix98_ioctl(struct tty_struct *tty,
607 unsigned int cmd, unsigned long arg)
610 case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
611 return pty_set_lock(tty, (int __user *)arg);
612 case TIOCGPTLCK: /* Get PT Lock status */
613 return pty_get_lock(tty, (int __user *)arg);
614 case TIOCPKT: /* Set PT packet mode */
615 return pty_set_pktmode(tty, (int __user *)arg);
616 case TIOCGPKT: /* Get PT packet mode */
617 return pty_get_pktmode(tty, (int __user *)arg);
618 case TIOCGPTN: /* Get PT Number */
619 return put_user(tty->index, (unsigned int __user *)arg);
620 case TIOCSIG: /* Send signal to other side of pty */
621 return pty_signal(tty, (int) arg);
628 * ptm_unix98_lookup - find a pty master
629 * @driver: ptm driver
632 * Look up a pty master device. Called under the tty_mutex for now.
633 * This provides our locking.
636 static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver,
637 struct inode *ptm_inode, int idx)
639 /* Master must be open via /dev/ptmx */
640 return ERR_PTR(-EIO);
644 * pts_unix98_lookup - find a pty slave
645 * @driver: pts driver
648 * Look up a pty master device. Called under the tty_mutex for now.
649 * This provides our locking for the tty pointer.
652 static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver,
653 struct inode *pts_inode, int idx)
655 struct tty_struct *tty;
657 mutex_lock(&devpts_mutex);
658 tty = devpts_get_priv(pts_inode);
659 mutex_unlock(&devpts_mutex);
660 /* Master must be open before slave */
662 return ERR_PTR(-EIO);
666 /* We have no need to install and remove our tty objects as devpts does all
669 static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty)
671 return pty_common_install(driver, tty, false);
674 static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
678 /* this is called once with whichever end is closed last */
679 static void pty_unix98_shutdown(struct tty_struct *tty)
681 devpts_kill_index(tty->driver_data, tty->index);
684 static const struct tty_operations ptm_unix98_ops = {
685 .lookup = ptm_unix98_lookup,
686 .install = pty_unix98_install,
687 .remove = pty_unix98_remove,
691 .write_room = pty_write_room,
692 .flush_buffer = pty_flush_buffer,
693 .chars_in_buffer = pty_chars_in_buffer,
694 .unthrottle = pty_unthrottle,
695 .ioctl = pty_unix98_ioctl,
696 .resize = pty_resize,
697 .shutdown = pty_unix98_shutdown,
698 .cleanup = pty_cleanup
701 static const struct tty_operations pty_unix98_ops = {
702 .lookup = pts_unix98_lookup,
703 .install = pty_unix98_install,
704 .remove = pty_unix98_remove,
708 .write_room = pty_write_room,
709 .flush_buffer = pty_flush_buffer,
710 .chars_in_buffer = pty_chars_in_buffer,
711 .unthrottle = pty_unthrottle,
712 .set_termios = pty_set_termios,
715 .shutdown = pty_unix98_shutdown,
716 .cleanup = pty_cleanup,
720 * ptmx_open - open a unix 98 pty master
721 * @inode: inode of device file
722 * @filp: file pointer to tty
724 * Allocate a unix98 pty master device from the ptmx driver.
726 * Locking: tty_mutex protects the init_dev work. tty->count should
728 * allocated_ptys_lock handles the list of free pty numbers
731 static int ptmx_open(struct inode *inode, struct file *filp)
733 struct tty_struct *tty;
734 struct inode *slave_inode;
738 nonseekable_open(inode, filp);
740 /* We refuse fsnotify events on ptmx, since it's a shared resource */
741 filp->f_mode |= FMODE_NONOTIFY;
743 retval = tty_alloc_file(filp);
747 /* find a device that is not in use. */
748 mutex_lock(&devpts_mutex);
749 index = devpts_new_index(inode);
752 mutex_unlock(&devpts_mutex);
756 mutex_unlock(&devpts_mutex);
758 mutex_lock(&tty_mutex);
759 tty = tty_init_dev(ptm_driver, index);
762 retval = PTR_ERR(tty);
766 /* The tty returned here is locked so we can safely
768 mutex_unlock(&tty_mutex);
770 set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
771 tty->driver_data = inode;
773 tty_add_file(tty, filp);
775 slave_inode = devpts_pty_new(inode,
776 MKDEV(UNIX98_PTY_SLAVE_MAJOR, index), index,
778 if (IS_ERR(slave_inode)) {
779 retval = PTR_ERR(slave_inode);
782 tty->link->driver_data = slave_inode;
784 retval = ptm_driver->ops->open(tty, filp);
788 tty_debug_hangup(tty, "(tty count=%d)\n", tty->count);
794 tty_release(inode, filp);
797 mutex_unlock(&tty_mutex);
798 devpts_kill_index(inode, index);
804 static struct file_operations ptmx_fops;
806 static void __init unix98_pty_init(void)
808 ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX,
809 TTY_DRIVER_RESET_TERMIOS |
810 TTY_DRIVER_REAL_RAW |
811 TTY_DRIVER_DYNAMIC_DEV |
812 TTY_DRIVER_DEVPTS_MEM |
813 TTY_DRIVER_DYNAMIC_ALLOC);
814 if (IS_ERR(ptm_driver))
815 panic("Couldn't allocate Unix98 ptm driver");
816 pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX,
817 TTY_DRIVER_RESET_TERMIOS |
818 TTY_DRIVER_REAL_RAW |
819 TTY_DRIVER_DYNAMIC_DEV |
820 TTY_DRIVER_DEVPTS_MEM |
821 TTY_DRIVER_DYNAMIC_ALLOC);
822 if (IS_ERR(pts_driver))
823 panic("Couldn't allocate Unix98 pts driver");
825 ptm_driver->driver_name = "pty_master";
826 ptm_driver->name = "ptm";
827 ptm_driver->major = UNIX98_PTY_MASTER_MAJOR;
828 ptm_driver->minor_start = 0;
829 ptm_driver->type = TTY_DRIVER_TYPE_PTY;
830 ptm_driver->subtype = PTY_TYPE_MASTER;
831 ptm_driver->init_termios = tty_std_termios;
832 ptm_driver->init_termios.c_iflag = 0;
833 ptm_driver->init_termios.c_oflag = 0;
834 ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
835 ptm_driver->init_termios.c_lflag = 0;
836 ptm_driver->init_termios.c_ispeed = 38400;
837 ptm_driver->init_termios.c_ospeed = 38400;
838 ptm_driver->other = pts_driver;
839 tty_set_operations(ptm_driver, &ptm_unix98_ops);
841 pts_driver->driver_name = "pty_slave";
842 pts_driver->name = "pts";
843 pts_driver->major = UNIX98_PTY_SLAVE_MAJOR;
844 pts_driver->minor_start = 0;
845 pts_driver->type = TTY_DRIVER_TYPE_PTY;
846 pts_driver->subtype = PTY_TYPE_SLAVE;
847 pts_driver->init_termios = tty_std_termios;
848 pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
849 pts_driver->init_termios.c_ispeed = 38400;
850 pts_driver->init_termios.c_ospeed = 38400;
851 pts_driver->other = ptm_driver;
852 tty_set_operations(pts_driver, &pty_unix98_ops);
854 if (tty_register_driver(ptm_driver))
855 panic("Couldn't register Unix98 ptm driver");
856 if (tty_register_driver(pts_driver))
857 panic("Couldn't register Unix98 pts driver");
859 /* Now create the /dev/ptmx special device */
860 tty_default_fops(&ptmx_fops);
861 ptmx_fops.open = ptmx_open;
863 cdev_init(&ptmx_cdev, &ptmx_fops);
864 if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) ||
865 register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0)
866 panic("Couldn't register /dev/ptmx driver");
867 device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx");
871 static inline void unix98_pty_init(void) { }
874 static int __init pty_init(void)
880 module_init(pty_init);