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>
29 #ifdef CONFIG_UNIX98_PTYS
30 static struct tty_driver
*ptm_driver
;
31 static struct tty_driver
*pts_driver
;
32 static DEFINE_MUTEX(devpts_mutex
);
35 static void pty_close(struct tty_struct
*tty
, struct file
*filp
)
38 if (tty
->driver
->subtype
== PTY_TYPE_MASTER
)
39 WARN_ON(tty
->count
> 1);
41 if (test_bit(TTY_IO_ERROR
, &tty
->flags
))
46 set_bit(TTY_IO_ERROR
, &tty
->flags
);
47 wake_up_interruptible(&tty
->read_wait
);
48 wake_up_interruptible(&tty
->write_wait
);
50 /* Review - krefs on tty_link ?? */
53 set_bit(TTY_OTHER_CLOSED
, &tty
->link
->flags
);
54 wake_up_interruptible(&tty
->link
->read_wait
);
55 wake_up_interruptible(&tty
->link
->write_wait
);
56 if (tty
->driver
->subtype
== PTY_TYPE_MASTER
) {
57 set_bit(TTY_OTHER_CLOSED
, &tty
->flags
);
58 #ifdef CONFIG_UNIX98_PTYS
59 if (tty
->driver
== ptm_driver
) {
60 mutex_lock(&devpts_mutex
);
61 if (tty
->link
->driver_data
)
62 devpts_pty_kill(tty
->link
->driver_data
);
63 mutex_unlock(&devpts_mutex
);
67 tty_vhangup(tty
->link
);
73 * The unthrottle routine is called by the line discipline to signal
74 * that it can receive more characters. For PTY's, the TTY_THROTTLED
75 * flag is always set, to force the line discipline to always call the
76 * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE
77 * characters in the queue. This is necessary since each time this
78 * happens, we need to wake up any sleeping processes that could be
79 * (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
80 * for the pty buffer to be drained.
82 static void pty_unthrottle(struct tty_struct
*tty
)
84 tty_wakeup(tty
->link
);
85 set_bit(TTY_THROTTLED
, &tty
->flags
);
89 * pty_space - report space left for writing
90 * @to: tty we are writing into
92 * Limit the buffer space used by ptys to 8k.
95 static int pty_space(struct tty_struct
*to
)
97 int n
= tty_buffer_space_avail(to
->port
);
102 * pty_write - write to a pty
103 * @tty: the tty we write from
104 * @buf: kernel buffer of data
105 * @count: bytes to write
107 * Our "hardware" write method. Data is coming from the ldisc which
108 * may be in a non sleeping state. We simply throw this at the other
109 * end of the link as if we were an IRQ handler receiving stuff for
110 * the other side of the pty/tty pair.
113 static int pty_write(struct tty_struct
*tty
, const unsigned char *buf
, int c
)
115 struct tty_struct
*to
= tty
->link
;
121 /* Stuff the data into the input queue of the other end */
122 c
= tty_insert_flip_string(to
->port
, buf
, c
);
125 tty_flip_buffer_push(to
->port
);
131 * pty_write_room - write space
132 * @tty: tty we are writing from
134 * Report how many bytes the ldisc can send into the queue for
138 static int pty_write_room(struct tty_struct
*tty
)
142 return pty_space(tty
->link
);
146 * pty_chars_in_buffer - characters currently in our tx queue
149 * Report how much we have in the transmit queue. As everything is
150 * instantly at the other end this is easy to implement.
153 static int pty_chars_in_buffer(struct tty_struct
*tty
)
158 /* Set the lock flag on a pty */
159 static int pty_set_lock(struct tty_struct
*tty
, int __user
*arg
)
162 if (get_user(val
, arg
))
165 set_bit(TTY_PTY_LOCK
, &tty
->flags
);
167 clear_bit(TTY_PTY_LOCK
, &tty
->flags
);
171 static int pty_get_lock(struct tty_struct
*tty
, int __user
*arg
)
173 int locked
= test_bit(TTY_PTY_LOCK
, &tty
->flags
);
174 return put_user(locked
, arg
);
177 /* Set the packet mode on a pty */
178 static int pty_set_pktmode(struct tty_struct
*tty
, int __user
*arg
)
183 if (get_user(pktmode
, arg
))
186 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
190 tty
->link
->ctrl_status
= 0;
194 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
199 /* Get the packet mode of a pty */
200 static int pty_get_pktmode(struct tty_struct
*tty
, int __user
*arg
)
202 int pktmode
= tty
->packet
;
203 return put_user(pktmode
, arg
);
206 /* Send a signal to the slave */
207 static int pty_signal(struct tty_struct
*tty
, int sig
)
213 spin_lock_irqsave(&tty
->link
->ctrl_lock
, flags
);
214 pgrp
= get_pid(tty
->link
->pgrp
);
215 spin_unlock_irqrestore(&tty
->link
->ctrl_lock
, flags
);
217 kill_pgrp(pgrp
, sig
, 1);
223 static void pty_flush_buffer(struct tty_struct
*tty
)
225 struct tty_struct
*to
= tty
->link
;
230 /* tty_buffer_flush(to); FIXME */
232 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
233 tty
->ctrl_status
|= TIOCPKT_FLUSHWRITE
;
234 wake_up_interruptible(&to
->read_wait
);
235 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
239 static int pty_open(struct tty_struct
*tty
, struct file
*filp
)
241 if (!tty
|| !tty
->link
)
244 if (test_bit(TTY_OTHER_CLOSED
, &tty
->flags
))
246 if (test_bit(TTY_PTY_LOCK
, &tty
->link
->flags
))
248 if (tty
->driver
->subtype
== PTY_TYPE_SLAVE
&& tty
->link
->count
!= 1)
251 clear_bit(TTY_IO_ERROR
, &tty
->flags
);
252 clear_bit(TTY_OTHER_CLOSED
, &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 tty
->termios
.c_cflag
&= ~(CSIZE
| PARENB
);
265 tty
->termios
.c_cflag
|= (CS8
| CREAD
);
269 * pty_do_resize - resize event
270 * @tty: tty being resized
271 * @ws: window size being set.
273 * Update the termios variables and send the necessary signals to
274 * peform a terminal resize correctly
277 static int pty_resize(struct tty_struct
*tty
, struct winsize
*ws
)
279 struct pid
*pgrp
, *rpgrp
;
281 struct tty_struct
*pty
= tty
->link
;
283 /* For a PTY we need to lock the tty side */
284 mutex_lock(&tty
->winsize_mutex
);
285 if (!memcmp(ws
, &tty
->winsize
, sizeof(*ws
)))
288 /* Get the PID values and reference them so we can
289 avoid holding the tty ctrl lock while sending signals.
290 We need to lock these individually however. */
292 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
293 pgrp
= get_pid(tty
->pgrp
);
294 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
296 spin_lock_irqsave(&pty
->ctrl_lock
, flags
);
297 rpgrp
= get_pid(pty
->pgrp
);
298 spin_unlock_irqrestore(&pty
->ctrl_lock
, flags
);
301 kill_pgrp(pgrp
, SIGWINCH
, 1);
302 if (rpgrp
!= pgrp
&& rpgrp
)
303 kill_pgrp(rpgrp
, SIGWINCH
, 1);
309 pty
->winsize
= *ws
; /* Never used so will go away soon */
311 mutex_unlock(&tty
->winsize_mutex
);
316 * pty_common_install - set up the pty pair
317 * @driver: the pty driver
318 * @tty: the tty being instantiated
319 * @legacy: true if this is BSD style
321 * Perform the initial set up for the tty/pty pair. Called from the
322 * tty layer when the port is first opened.
324 * Locking: the caller must hold the tty_mutex
326 static int pty_common_install(struct tty_driver
*driver
, struct tty_struct
*tty
,
329 struct tty_struct
*o_tty
;
330 struct tty_port
*ports
[2];
331 int idx
= tty
->index
;
332 int retval
= -ENOMEM
;
334 ports
[0] = kmalloc(sizeof **ports
, GFP_KERNEL
);
335 ports
[1] = kmalloc(sizeof **ports
, GFP_KERNEL
);
336 if (!ports
[0] || !ports
[1])
338 if (!try_module_get(driver
->other
->owner
)) {
339 /* This cannot in fact currently happen */
342 o_tty
= alloc_tty_struct(driver
->other
, idx
);
347 /* We always use new tty termios data so we can do this
349 retval
= tty_init_termios(tty
);
353 retval
= tty_init_termios(o_tty
);
355 goto err_free_termios
;
357 driver
->other
->ttys
[idx
] = o_tty
;
358 driver
->ttys
[idx
] = tty
;
360 memset(&tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
361 tty
->termios
= driver
->init_termios
;
362 memset(&o_tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
363 o_tty
->termios
= driver
->other
->init_termios
;
367 * Everything allocated ... set up the o_tty structure.
369 tty_driver_kref_get(driver
->other
);
370 if (driver
->subtype
== PTY_TYPE_MASTER
)
372 /* Establish the links in both directions */
375 tty_port_init(ports
[0]);
376 tty_port_init(ports
[1]);
377 o_tty
->port
= ports
[0];
378 tty
->port
= ports
[1];
379 o_tty
->port
->itty
= o_tty
;
381 tty_driver_kref_get(driver
);
386 tty_free_termios(tty
);
388 deinitialize_tty_struct(o_tty
);
389 free_tty_struct(o_tty
);
391 module_put(driver
->other
->owner
);
398 static void pty_cleanup(struct tty_struct
*tty
)
400 tty_port_put(tty
->port
);
403 /* Traditional BSD devices */
404 #ifdef CONFIG_LEGACY_PTYS
406 static int pty_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
408 return pty_common_install(driver
, tty
, true);
411 static void pty_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
413 struct tty_struct
*pair
= tty
->link
;
414 driver
->ttys
[tty
->index
] = NULL
;
416 pair
->driver
->ttys
[pair
->index
] = NULL
;
419 static int pty_bsd_ioctl(struct tty_struct
*tty
,
420 unsigned int cmd
, unsigned long arg
)
423 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
424 return pty_set_lock(tty
, (int __user
*) arg
);
425 case TIOCGPTLCK
: /* Get PT Lock status */
426 return pty_get_lock(tty
, (int __user
*)arg
);
427 case TIOCPKT
: /* Set PT packet mode */
428 return pty_set_pktmode(tty
, (int __user
*)arg
);
429 case TIOCGPKT
: /* Get PT packet mode */
430 return pty_get_pktmode(tty
, (int __user
*)arg
);
431 case TIOCSIG
: /* Send signal to other side of pty */
432 return pty_signal(tty
, (int) arg
);
433 case TIOCGPTN
: /* TTY returns ENOTTY, but glibc expects EINVAL here */
439 static int legacy_count
= CONFIG_LEGACY_PTY_COUNT
;
440 module_param(legacy_count
, int, 0);
443 * The master side of a pty can do TIOCSPTLCK and thus
446 static const struct tty_operations master_pty_ops_bsd
= {
447 .install
= pty_install
,
451 .write_room
= pty_write_room
,
452 .flush_buffer
= pty_flush_buffer
,
453 .chars_in_buffer
= pty_chars_in_buffer
,
454 .unthrottle
= pty_unthrottle
,
455 .set_termios
= pty_set_termios
,
456 .ioctl
= pty_bsd_ioctl
,
457 .cleanup
= pty_cleanup
,
458 .resize
= pty_resize
,
462 static const struct tty_operations slave_pty_ops_bsd
= {
463 .install
= pty_install
,
467 .write_room
= pty_write_room
,
468 .flush_buffer
= pty_flush_buffer
,
469 .chars_in_buffer
= pty_chars_in_buffer
,
470 .unthrottle
= pty_unthrottle
,
471 .set_termios
= pty_set_termios
,
472 .cleanup
= pty_cleanup
,
473 .resize
= pty_resize
,
477 static void __init
legacy_pty_init(void)
479 struct tty_driver
*pty_driver
, *pty_slave_driver
;
481 if (legacy_count
<= 0)
484 pty_driver
= tty_alloc_driver(legacy_count
,
485 TTY_DRIVER_RESET_TERMIOS
|
486 TTY_DRIVER_REAL_RAW
|
487 TTY_DRIVER_DYNAMIC_ALLOC
);
488 if (IS_ERR(pty_driver
))
489 panic("Couldn't allocate pty driver");
491 pty_slave_driver
= tty_alloc_driver(legacy_count
,
492 TTY_DRIVER_RESET_TERMIOS
|
493 TTY_DRIVER_REAL_RAW
|
494 TTY_DRIVER_DYNAMIC_ALLOC
);
495 if (IS_ERR(pty_slave_driver
))
496 panic("Couldn't allocate pty slave driver");
498 pty_driver
->driver_name
= "pty_master";
499 pty_driver
->name
= "pty";
500 pty_driver
->major
= PTY_MASTER_MAJOR
;
501 pty_driver
->minor_start
= 0;
502 pty_driver
->type
= TTY_DRIVER_TYPE_PTY
;
503 pty_driver
->subtype
= PTY_TYPE_MASTER
;
504 pty_driver
->init_termios
= tty_std_termios
;
505 pty_driver
->init_termios
.c_iflag
= 0;
506 pty_driver
->init_termios
.c_oflag
= 0;
507 pty_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
508 pty_driver
->init_termios
.c_lflag
= 0;
509 pty_driver
->init_termios
.c_ispeed
= 38400;
510 pty_driver
->init_termios
.c_ospeed
= 38400;
511 pty_driver
->other
= pty_slave_driver
;
512 tty_set_operations(pty_driver
, &master_pty_ops_bsd
);
514 pty_slave_driver
->driver_name
= "pty_slave";
515 pty_slave_driver
->name
= "ttyp";
516 pty_slave_driver
->major
= PTY_SLAVE_MAJOR
;
517 pty_slave_driver
->minor_start
= 0;
518 pty_slave_driver
->type
= TTY_DRIVER_TYPE_PTY
;
519 pty_slave_driver
->subtype
= PTY_TYPE_SLAVE
;
520 pty_slave_driver
->init_termios
= tty_std_termios
;
521 pty_slave_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
522 pty_slave_driver
->init_termios
.c_ispeed
= 38400;
523 pty_slave_driver
->init_termios
.c_ospeed
= 38400;
524 pty_slave_driver
->other
= pty_driver
;
525 tty_set_operations(pty_slave_driver
, &slave_pty_ops_bsd
);
527 if (tty_register_driver(pty_driver
))
528 panic("Couldn't register pty driver");
529 if (tty_register_driver(pty_slave_driver
))
530 panic("Couldn't register pty slave driver");
533 static inline void legacy_pty_init(void) { }
537 #ifdef CONFIG_UNIX98_PTYS
539 static struct cdev ptmx_cdev
;
541 static int pty_unix98_ioctl(struct tty_struct
*tty
,
542 unsigned int cmd
, unsigned long arg
)
545 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
546 return pty_set_lock(tty
, (int __user
*)arg
);
547 case TIOCGPTLCK
: /* Get PT Lock status */
548 return pty_get_lock(tty
, (int __user
*)arg
);
549 case TIOCPKT
: /* Set PT packet mode */
550 return pty_set_pktmode(tty
, (int __user
*)arg
);
551 case TIOCGPKT
: /* Get PT packet mode */
552 return pty_get_pktmode(tty
, (int __user
*)arg
);
553 case TIOCGPTN
: /* Get PT Number */
554 return put_user(tty
->index
, (unsigned int __user
*)arg
);
555 case TIOCSIG
: /* Send signal to other side of pty */
556 return pty_signal(tty
, (int) arg
);
563 * ptm_unix98_lookup - find a pty master
564 * @driver: ptm driver
567 * Look up a pty master device. Called under the tty_mutex for now.
568 * This provides our locking.
571 static struct tty_struct
*ptm_unix98_lookup(struct tty_driver
*driver
,
572 struct inode
*ptm_inode
, int idx
)
574 /* Master must be open via /dev/ptmx */
575 return ERR_PTR(-EIO
);
579 * pts_unix98_lookup - find a pty slave
580 * @driver: pts driver
583 * Look up a pty master device. Called under the tty_mutex for now.
584 * This provides our locking for the tty pointer.
587 static struct tty_struct
*pts_unix98_lookup(struct tty_driver
*driver
,
588 struct inode
*pts_inode
, int idx
)
590 struct tty_struct
*tty
;
592 mutex_lock(&devpts_mutex
);
593 tty
= devpts_get_priv(pts_inode
);
594 mutex_unlock(&devpts_mutex
);
595 /* Master must be open before slave */
597 return ERR_PTR(-EIO
);
601 /* We have no need to install and remove our tty objects as devpts does all
604 static int pty_unix98_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
606 return pty_common_install(driver
, tty
, false);
609 static void pty_unix98_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
613 /* this is called once with whichever end is closed last */
614 static void pty_unix98_shutdown(struct tty_struct
*tty
)
616 devpts_kill_index(tty
->driver_data
, tty
->index
);
619 static const struct tty_operations ptm_unix98_ops
= {
620 .lookup
= ptm_unix98_lookup
,
621 .install
= pty_unix98_install
,
622 .remove
= pty_unix98_remove
,
626 .write_room
= pty_write_room
,
627 .flush_buffer
= pty_flush_buffer
,
628 .chars_in_buffer
= pty_chars_in_buffer
,
629 .unthrottle
= pty_unthrottle
,
630 .set_termios
= pty_set_termios
,
631 .ioctl
= pty_unix98_ioctl
,
632 .resize
= pty_resize
,
633 .shutdown
= pty_unix98_shutdown
,
634 .cleanup
= pty_cleanup
637 static const struct tty_operations pty_unix98_ops
= {
638 .lookup
= pts_unix98_lookup
,
639 .install
= pty_unix98_install
,
640 .remove
= pty_unix98_remove
,
644 .write_room
= pty_write_room
,
645 .flush_buffer
= pty_flush_buffer
,
646 .chars_in_buffer
= pty_chars_in_buffer
,
647 .unthrottle
= pty_unthrottle
,
648 .set_termios
= pty_set_termios
,
649 .shutdown
= pty_unix98_shutdown
,
650 .cleanup
= pty_cleanup
,
654 * ptmx_open - open a unix 98 pty master
655 * @inode: inode of device file
656 * @filp: file pointer to tty
658 * Allocate a unix98 pty master device from the ptmx driver.
660 * Locking: tty_mutex protects the init_dev work. tty->count should
662 * allocated_ptys_lock handles the list of free pty numbers
665 static int ptmx_open(struct inode
*inode
, struct file
*filp
)
667 struct tty_struct
*tty
;
668 struct inode
*slave_inode
;
672 nonseekable_open(inode
, filp
);
674 /* We refuse fsnotify events on ptmx, since it's a shared resource */
675 filp
->f_mode
|= FMODE_NONOTIFY
;
677 retval
= tty_alloc_file(filp
);
681 /* find a device that is not in use. */
682 mutex_lock(&devpts_mutex
);
683 index
= devpts_new_index(inode
);
686 mutex_unlock(&devpts_mutex
);
690 mutex_unlock(&devpts_mutex
);
692 mutex_lock(&tty_mutex
);
693 tty
= tty_init_dev(ptm_driver
, index
);
696 retval
= PTR_ERR(tty
);
700 /* The tty returned here is locked so we can safely
702 mutex_unlock(&tty_mutex
);
704 set_bit(TTY_PTY_LOCK
, &tty
->flags
); /* LOCK THE SLAVE */
705 tty
->driver_data
= inode
;
707 tty_add_file(tty
, filp
);
709 slave_inode
= devpts_pty_new(inode
,
710 MKDEV(UNIX98_PTY_SLAVE_MAJOR
, index
), index
,
712 if (IS_ERR(slave_inode
)) {
713 retval
= PTR_ERR(slave_inode
);
716 tty
->link
->driver_data
= slave_inode
;
718 retval
= ptm_driver
->ops
->open(tty
, filp
);
726 tty_release(inode
, filp
);
729 mutex_unlock(&tty_mutex
);
730 devpts_kill_index(inode
, index
);
736 static struct file_operations ptmx_fops
;
738 static void __init
unix98_pty_init(void)
740 ptm_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
741 TTY_DRIVER_RESET_TERMIOS
|
742 TTY_DRIVER_REAL_RAW
|
743 TTY_DRIVER_DYNAMIC_DEV
|
744 TTY_DRIVER_DEVPTS_MEM
|
745 TTY_DRIVER_DYNAMIC_ALLOC
);
746 if (IS_ERR(ptm_driver
))
747 panic("Couldn't allocate Unix98 ptm driver");
748 pts_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
749 TTY_DRIVER_RESET_TERMIOS
|
750 TTY_DRIVER_REAL_RAW
|
751 TTY_DRIVER_DYNAMIC_DEV
|
752 TTY_DRIVER_DEVPTS_MEM
|
753 TTY_DRIVER_DYNAMIC_ALLOC
);
754 if (IS_ERR(pts_driver
))
755 panic("Couldn't allocate Unix98 pts driver");
757 ptm_driver
->driver_name
= "pty_master";
758 ptm_driver
->name
= "ptm";
759 ptm_driver
->major
= UNIX98_PTY_MASTER_MAJOR
;
760 ptm_driver
->minor_start
= 0;
761 ptm_driver
->type
= TTY_DRIVER_TYPE_PTY
;
762 ptm_driver
->subtype
= PTY_TYPE_MASTER
;
763 ptm_driver
->init_termios
= tty_std_termios
;
764 ptm_driver
->init_termios
.c_iflag
= 0;
765 ptm_driver
->init_termios
.c_oflag
= 0;
766 ptm_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
767 ptm_driver
->init_termios
.c_lflag
= 0;
768 ptm_driver
->init_termios
.c_ispeed
= 38400;
769 ptm_driver
->init_termios
.c_ospeed
= 38400;
770 ptm_driver
->other
= pts_driver
;
771 tty_set_operations(ptm_driver
, &ptm_unix98_ops
);
773 pts_driver
->driver_name
= "pty_slave";
774 pts_driver
->name
= "pts";
775 pts_driver
->major
= UNIX98_PTY_SLAVE_MAJOR
;
776 pts_driver
->minor_start
= 0;
777 pts_driver
->type
= TTY_DRIVER_TYPE_PTY
;
778 pts_driver
->subtype
= PTY_TYPE_SLAVE
;
779 pts_driver
->init_termios
= tty_std_termios
;
780 pts_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
781 pts_driver
->init_termios
.c_ispeed
= 38400;
782 pts_driver
->init_termios
.c_ospeed
= 38400;
783 pts_driver
->other
= ptm_driver
;
784 tty_set_operations(pts_driver
, &pty_unix98_ops
);
786 if (tty_register_driver(ptm_driver
))
787 panic("Couldn't register Unix98 ptm driver");
788 if (tty_register_driver(pts_driver
))
789 panic("Couldn't register Unix98 pts driver");
791 /* Now create the /dev/ptmx special device */
792 tty_default_fops(&ptmx_fops
);
793 ptmx_fops
.open
= ptmx_open
;
795 cdev_init(&ptmx_cdev
, &ptmx_fops
);
796 if (cdev_add(&ptmx_cdev
, MKDEV(TTYAUX_MAJOR
, 2), 1) ||
797 register_chrdev_region(MKDEV(TTYAUX_MAJOR
, 2), 1, "/dev/ptmx") < 0)
798 panic("Couldn't register /dev/ptmx driver");
799 device_create(tty_class
, NULL
, MKDEV(TTYAUX_MAJOR
, 2), NULL
, "ptmx");
803 static inline void unix98_pty_init(void) { }
806 static int __init
pty_init(void)
812 module_init(pty_init
);