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 * The tty buffers allow 64K but we sneak a peak and clip at 8K this
93 * allows a lot of overspill room for echo and other fun messes to
97 static int pty_space(struct tty_struct
*to
)
99 int n
= 8192 - to
->port
->buf
.memory_used
;
106 * pty_write - write to a pty
107 * @tty: the tty we write from
108 * @buf: kernel buffer of data
109 * @count: bytes to write
111 * Our "hardware" write method. Data is coming from the ldisc which
112 * may be in a non sleeping state. We simply throw this at the other
113 * end of the link as if we were an IRQ handler receiving stuff for
114 * the other side of the pty/tty pair.
117 static int pty_write(struct tty_struct
*tty
, const unsigned char *buf
, int c
)
119 struct tty_struct
*to
= tty
->link
;
125 /* Stuff the data into the input queue of the other end */
126 c
= tty_insert_flip_string(to
->port
, buf
, c
);
129 tty_flip_buffer_push(to
->port
);
137 * pty_write_room - write space
138 * @tty: tty we are writing from
140 * Report how many bytes the ldisc can send into the queue for
144 static int pty_write_room(struct tty_struct
*tty
)
148 return pty_space(tty
->link
);
152 * pty_chars_in_buffer - characters currently in our tx queue
155 * Report how much we have in the transmit queue. As everything is
156 * instantly at the other end this is easy to implement.
159 static int pty_chars_in_buffer(struct tty_struct
*tty
)
164 /* Set the lock flag on a pty */
165 static int pty_set_lock(struct tty_struct
*tty
, int __user
*arg
)
168 if (get_user(val
, arg
))
171 set_bit(TTY_PTY_LOCK
, &tty
->flags
);
173 clear_bit(TTY_PTY_LOCK
, &tty
->flags
);
177 static int pty_get_lock(struct tty_struct
*tty
, int __user
*arg
)
179 int locked
= test_bit(TTY_PTY_LOCK
, &tty
->flags
);
180 return put_user(locked
, arg
);
183 /* Set the packet mode on a pty */
184 static int pty_set_pktmode(struct tty_struct
*tty
, int __user
*arg
)
189 if (get_user(pktmode
, arg
))
192 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
196 tty
->link
->ctrl_status
= 0;
200 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
205 /* Get the packet mode of a pty */
206 static int pty_get_pktmode(struct tty_struct
*tty
, int __user
*arg
)
208 int pktmode
= tty
->packet
;
209 return put_user(pktmode
, arg
);
212 /* Send a signal to the slave */
213 static int pty_signal(struct tty_struct
*tty
, int sig
)
219 spin_lock_irqsave(&tty
->link
->ctrl_lock
, flags
);
220 pgrp
= get_pid(tty
->link
->pgrp
);
221 spin_unlock_irqrestore(&tty
->link
->ctrl_lock
, flags
);
223 kill_pgrp(pgrp
, sig
, 1);
229 static void pty_flush_buffer(struct tty_struct
*tty
)
231 struct tty_struct
*to
= tty
->link
;
236 /* tty_buffer_flush(to); FIXME */
238 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
239 tty
->ctrl_status
|= TIOCPKT_FLUSHWRITE
;
240 wake_up_interruptible(&to
->read_wait
);
241 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
245 static int pty_open(struct tty_struct
*tty
, struct file
*filp
)
247 int retval
= -ENODEV
;
249 if (!tty
|| !tty
->link
)
252 set_bit(TTY_IO_ERROR
, &tty
->flags
);
255 if (test_bit(TTY_OTHER_CLOSED
, &tty
->flags
))
257 if (test_bit(TTY_PTY_LOCK
, &tty
->link
->flags
))
259 if (tty
->driver
->subtype
== PTY_TYPE_SLAVE
&& tty
->link
->count
!= 1)
262 clear_bit(TTY_IO_ERROR
, &tty
->flags
);
263 clear_bit(TTY_OTHER_CLOSED
, &tty
->link
->flags
);
264 set_bit(TTY_THROTTLED
, &tty
->flags
);
270 static void pty_set_termios(struct tty_struct
*tty
,
271 struct ktermios
*old_termios
)
273 tty
->termios
.c_cflag
&= ~(CSIZE
| PARENB
);
274 tty
->termios
.c_cflag
|= (CS8
| CREAD
);
278 * pty_do_resize - resize event
279 * @tty: tty being resized
280 * @ws: window size being set.
282 * Update the termios variables and send the necessary signals to
283 * peform a terminal resize correctly
286 static int pty_resize(struct tty_struct
*tty
, struct winsize
*ws
)
288 struct pid
*pgrp
, *rpgrp
;
290 struct tty_struct
*pty
= tty
->link
;
292 /* For a PTY we need to lock the tty side */
293 mutex_lock(&tty
->termios_mutex
);
294 if (!memcmp(ws
, &tty
->winsize
, sizeof(*ws
)))
297 /* Get the PID values and reference them so we can
298 avoid holding the tty ctrl lock while sending signals.
299 We need to lock these individually however. */
301 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
302 pgrp
= get_pid(tty
->pgrp
);
303 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
305 spin_lock_irqsave(&pty
->ctrl_lock
, flags
);
306 rpgrp
= get_pid(pty
->pgrp
);
307 spin_unlock_irqrestore(&pty
->ctrl_lock
, flags
);
310 kill_pgrp(pgrp
, SIGWINCH
, 1);
311 if (rpgrp
!= pgrp
&& rpgrp
)
312 kill_pgrp(rpgrp
, SIGWINCH
, 1);
318 pty
->winsize
= *ws
; /* Never used so will go away soon */
320 mutex_unlock(&tty
->termios_mutex
);
325 * pty_common_install - set up the pty pair
326 * @driver: the pty driver
327 * @tty: the tty being instantiated
328 * @bool: legacy, true if this is BSD style
330 * Perform the initial set up for the tty/pty pair. Called from the
331 * tty layer when the port is first opened.
333 * Locking: the caller must hold the tty_mutex
335 static int pty_common_install(struct tty_driver
*driver
, struct tty_struct
*tty
,
338 struct tty_struct
*o_tty
;
339 struct tty_port
*ports
[2];
340 int idx
= tty
->index
;
341 int retval
= -ENOMEM
;
343 o_tty
= alloc_tty_struct();
346 ports
[0] = kmalloc(sizeof **ports
, GFP_KERNEL
);
347 ports
[1] = kmalloc(sizeof **ports
, GFP_KERNEL
);
348 if (!ports
[0] || !ports
[1])
350 if (!try_module_get(driver
->other
->owner
)) {
351 /* This cannot in fact currently happen */
354 initialize_tty_struct(o_tty
, driver
->other
, idx
);
357 /* We always use new tty termios data so we can do this
359 retval
= tty_init_termios(tty
);
363 retval
= tty_init_termios(o_tty
);
365 goto err_free_termios
;
367 driver
->other
->ttys
[idx
] = o_tty
;
368 driver
->ttys
[idx
] = tty
;
370 memset(&tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
371 tty
->termios
= driver
->init_termios
;
372 memset(&o_tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
373 o_tty
->termios
= driver
->other
->init_termios
;
377 * Everything allocated ... set up the o_tty structure.
379 tty_driver_kref_get(driver
->other
);
380 if (driver
->subtype
== PTY_TYPE_MASTER
)
382 /* Establish the links in both directions */
385 tty_port_init(ports
[0]);
386 tty_port_init(ports
[1]);
387 o_tty
->port
= ports
[0];
388 tty
->port
= ports
[1];
389 o_tty
->port
->itty
= o_tty
;
391 tty_driver_kref_get(driver
);
396 tty_free_termios(tty
);
398 deinitialize_tty_struct(o_tty
);
399 module_put(o_tty
->driver
->owner
);
403 free_tty_struct(o_tty
);
408 /* this is called once with whichever end is closed last */
409 static void pty_unix98_shutdown(struct tty_struct
*tty
)
411 devpts_kill_index(tty
->driver_data
, tty
->index
);
414 static void pty_cleanup(struct tty_struct
*tty
)
416 tty
->port
->itty
= NULL
;
417 tty_port_put(tty
->port
);
420 /* Traditional BSD devices */
421 #ifdef CONFIG_LEGACY_PTYS
423 static int pty_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
425 return pty_common_install(driver
, tty
, true);
428 static void pty_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
430 struct tty_struct
*pair
= tty
->link
;
431 driver
->ttys
[tty
->index
] = NULL
;
433 pair
->driver
->ttys
[pair
->index
] = NULL
;
436 static int pty_bsd_ioctl(struct tty_struct
*tty
,
437 unsigned int cmd
, unsigned long arg
)
440 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
441 return pty_set_lock(tty
, (int __user
*) arg
);
442 case TIOCGPTLCK
: /* Get PT Lock status */
443 return pty_get_lock(tty
, (int __user
*)arg
);
444 case TIOCPKT
: /* Set PT packet mode */
445 return pty_set_pktmode(tty
, (int __user
*)arg
);
446 case TIOCGPKT
: /* Get PT packet mode */
447 return pty_get_pktmode(tty
, (int __user
*)arg
);
448 case TIOCSIG
: /* Send signal to other side of pty */
449 return pty_signal(tty
, (int) arg
);
450 case TIOCGPTN
: /* TTY returns ENOTTY, but glibc expects EINVAL here */
456 static int legacy_count
= CONFIG_LEGACY_PTY_COUNT
;
457 module_param(legacy_count
, int, 0);
460 * The master side of a pty can do TIOCSPTLCK and thus
463 static const struct tty_operations master_pty_ops_bsd
= {
464 .install
= pty_install
,
468 .write_room
= pty_write_room
,
469 .flush_buffer
= pty_flush_buffer
,
470 .chars_in_buffer
= pty_chars_in_buffer
,
471 .unthrottle
= pty_unthrottle
,
472 .set_termios
= pty_set_termios
,
473 .ioctl
= pty_bsd_ioctl
,
474 .cleanup
= pty_cleanup
,
475 .resize
= pty_resize
,
479 static const struct tty_operations slave_pty_ops_bsd
= {
480 .install
= pty_install
,
484 .write_room
= pty_write_room
,
485 .flush_buffer
= pty_flush_buffer
,
486 .chars_in_buffer
= pty_chars_in_buffer
,
487 .unthrottle
= pty_unthrottle
,
488 .set_termios
= pty_set_termios
,
489 .cleanup
= pty_cleanup
,
490 .resize
= pty_resize
,
494 static void __init
legacy_pty_init(void)
496 struct tty_driver
*pty_driver
, *pty_slave_driver
;
498 if (legacy_count
<= 0)
501 pty_driver
= tty_alloc_driver(legacy_count
,
502 TTY_DRIVER_RESET_TERMIOS
|
503 TTY_DRIVER_REAL_RAW
|
504 TTY_DRIVER_DYNAMIC_ALLOC
);
505 if (IS_ERR(pty_driver
))
506 panic("Couldn't allocate pty driver");
508 pty_slave_driver
= tty_alloc_driver(legacy_count
,
509 TTY_DRIVER_RESET_TERMIOS
|
510 TTY_DRIVER_REAL_RAW
|
511 TTY_DRIVER_DYNAMIC_ALLOC
);
512 if (IS_ERR(pty_slave_driver
))
513 panic("Couldn't allocate pty slave driver");
515 pty_driver
->driver_name
= "pty_master";
516 pty_driver
->name
= "pty";
517 pty_driver
->major
= PTY_MASTER_MAJOR
;
518 pty_driver
->minor_start
= 0;
519 pty_driver
->type
= TTY_DRIVER_TYPE_PTY
;
520 pty_driver
->subtype
= PTY_TYPE_MASTER
;
521 pty_driver
->init_termios
= tty_std_termios
;
522 pty_driver
->init_termios
.c_iflag
= 0;
523 pty_driver
->init_termios
.c_oflag
= 0;
524 pty_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
525 pty_driver
->init_termios
.c_lflag
= 0;
526 pty_driver
->init_termios
.c_ispeed
= 38400;
527 pty_driver
->init_termios
.c_ospeed
= 38400;
528 pty_driver
->other
= pty_slave_driver
;
529 tty_set_operations(pty_driver
, &master_pty_ops_bsd
);
531 pty_slave_driver
->driver_name
= "pty_slave";
532 pty_slave_driver
->name
= "ttyp";
533 pty_slave_driver
->major
= PTY_SLAVE_MAJOR
;
534 pty_slave_driver
->minor_start
= 0;
535 pty_slave_driver
->type
= TTY_DRIVER_TYPE_PTY
;
536 pty_slave_driver
->subtype
= PTY_TYPE_SLAVE
;
537 pty_slave_driver
->init_termios
= tty_std_termios
;
538 pty_slave_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
539 pty_slave_driver
->init_termios
.c_ispeed
= 38400;
540 pty_slave_driver
->init_termios
.c_ospeed
= 38400;
541 pty_slave_driver
->other
= pty_driver
;
542 tty_set_operations(pty_slave_driver
, &slave_pty_ops_bsd
);
544 if (tty_register_driver(pty_driver
))
545 panic("Couldn't register pty driver");
546 if (tty_register_driver(pty_slave_driver
))
547 panic("Couldn't register pty slave driver");
550 static inline void legacy_pty_init(void) { }
554 #ifdef CONFIG_UNIX98_PTYS
556 static struct cdev ptmx_cdev
;
558 static int pty_unix98_ioctl(struct tty_struct
*tty
,
559 unsigned int cmd
, unsigned long arg
)
562 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
563 return pty_set_lock(tty
, (int __user
*)arg
);
564 case TIOCGPTLCK
: /* Get PT Lock status */
565 return pty_get_lock(tty
, (int __user
*)arg
);
566 case TIOCPKT
: /* Set PT packet mode */
567 return pty_set_pktmode(tty
, (int __user
*)arg
);
568 case TIOCGPKT
: /* Get PT packet mode */
569 return pty_get_pktmode(tty
, (int __user
*)arg
);
570 case TIOCGPTN
: /* Get PT Number */
571 return put_user(tty
->index
, (unsigned int __user
*)arg
);
572 case TIOCSIG
: /* Send signal to other side of pty */
573 return pty_signal(tty
, (int) arg
);
580 * ptm_unix98_lookup - find a pty master
581 * @driver: ptm driver
584 * Look up a pty master device. Called under the tty_mutex for now.
585 * This provides our locking.
588 static struct tty_struct
*ptm_unix98_lookup(struct tty_driver
*driver
,
589 struct inode
*ptm_inode
, int idx
)
591 /* Master must be open via /dev/ptmx */
592 return ERR_PTR(-EIO
);
596 * pts_unix98_lookup - find a pty slave
597 * @driver: pts driver
600 * Look up a pty master device. Called under the tty_mutex for now.
601 * This provides our locking for the tty pointer.
604 static struct tty_struct
*pts_unix98_lookup(struct tty_driver
*driver
,
605 struct inode
*pts_inode
, int idx
)
607 struct tty_struct
*tty
;
609 mutex_lock(&devpts_mutex
);
610 tty
= devpts_get_priv(pts_inode
);
611 mutex_unlock(&devpts_mutex
);
612 /* Master must be open before slave */
614 return ERR_PTR(-EIO
);
618 /* We have no need to install and remove our tty objects as devpts does all
621 static int pty_unix98_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
623 return pty_common_install(driver
, tty
, false);
626 static void pty_unix98_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
630 static const struct tty_operations ptm_unix98_ops
= {
631 .lookup
= ptm_unix98_lookup
,
632 .install
= pty_unix98_install
,
633 .remove
= pty_unix98_remove
,
637 .write_room
= pty_write_room
,
638 .flush_buffer
= pty_flush_buffer
,
639 .chars_in_buffer
= pty_chars_in_buffer
,
640 .unthrottle
= pty_unthrottle
,
641 .set_termios
= pty_set_termios
,
642 .ioctl
= pty_unix98_ioctl
,
643 .resize
= pty_resize
,
644 .shutdown
= pty_unix98_shutdown
,
645 .cleanup
= pty_cleanup
648 static const struct tty_operations pty_unix98_ops
= {
649 .lookup
= pts_unix98_lookup
,
650 .install
= pty_unix98_install
,
651 .remove
= pty_unix98_remove
,
655 .write_room
= pty_write_room
,
656 .flush_buffer
= pty_flush_buffer
,
657 .chars_in_buffer
= pty_chars_in_buffer
,
658 .unthrottle
= pty_unthrottle
,
659 .set_termios
= pty_set_termios
,
660 .shutdown
= pty_unix98_shutdown
,
661 .cleanup
= pty_cleanup
,
665 * ptmx_open - open a unix 98 pty master
666 * @inode: inode of device file
667 * @filp: file pointer to tty
669 * Allocate a unix98 pty master device from the ptmx driver.
671 * Locking: tty_mutex protects the init_dev work. tty->count should
673 * allocated_ptys_lock handles the list of free pty numbers
676 static int ptmx_open(struct inode
*inode
, struct file
*filp
)
678 struct tty_struct
*tty
;
679 struct inode
*slave_inode
;
683 nonseekable_open(inode
, filp
);
685 retval
= tty_alloc_file(filp
);
689 /* find a device that is not in use. */
690 mutex_lock(&devpts_mutex
);
691 index
= devpts_new_index(inode
);
694 mutex_unlock(&devpts_mutex
);
698 mutex_unlock(&devpts_mutex
);
700 mutex_lock(&tty_mutex
);
701 tty
= tty_init_dev(ptm_driver
, index
);
704 retval
= PTR_ERR(tty
);
708 /* The tty returned here is locked so we can safely
710 mutex_unlock(&tty_mutex
);
712 set_bit(TTY_PTY_LOCK
, &tty
->flags
); /* LOCK THE SLAVE */
713 tty
->driver_data
= inode
;
715 tty_add_file(tty
, filp
);
717 slave_inode
= devpts_pty_new(inode
,
718 MKDEV(UNIX98_PTY_SLAVE_MAJOR
, index
), index
,
720 if (IS_ERR(slave_inode
)) {
721 retval
= PTR_ERR(slave_inode
);
724 tty
->link
->driver_data
= slave_inode
;
726 retval
= ptm_driver
->ops
->open(tty
, filp
);
734 tty_release(inode
, filp
);
737 mutex_unlock(&tty_mutex
);
738 devpts_kill_index(inode
, index
);
744 static struct file_operations ptmx_fops
;
746 static void __init
unix98_pty_init(void)
748 ptm_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(ptm_driver
))
755 panic("Couldn't allocate Unix98 ptm driver");
756 pts_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
757 TTY_DRIVER_RESET_TERMIOS
|
758 TTY_DRIVER_REAL_RAW
|
759 TTY_DRIVER_DYNAMIC_DEV
|
760 TTY_DRIVER_DEVPTS_MEM
|
761 TTY_DRIVER_DYNAMIC_ALLOC
);
762 if (IS_ERR(pts_driver
))
763 panic("Couldn't allocate Unix98 pts driver");
765 ptm_driver
->driver_name
= "pty_master";
766 ptm_driver
->name
= "ptm";
767 ptm_driver
->major
= UNIX98_PTY_MASTER_MAJOR
;
768 ptm_driver
->minor_start
= 0;
769 ptm_driver
->type
= TTY_DRIVER_TYPE_PTY
;
770 ptm_driver
->subtype
= PTY_TYPE_MASTER
;
771 ptm_driver
->init_termios
= tty_std_termios
;
772 ptm_driver
->init_termios
.c_iflag
= 0;
773 ptm_driver
->init_termios
.c_oflag
= 0;
774 ptm_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
775 ptm_driver
->init_termios
.c_lflag
= 0;
776 ptm_driver
->init_termios
.c_ispeed
= 38400;
777 ptm_driver
->init_termios
.c_ospeed
= 38400;
778 ptm_driver
->other
= pts_driver
;
779 tty_set_operations(ptm_driver
, &ptm_unix98_ops
);
781 pts_driver
->driver_name
= "pty_slave";
782 pts_driver
->name
= "pts";
783 pts_driver
->major
= UNIX98_PTY_SLAVE_MAJOR
;
784 pts_driver
->minor_start
= 0;
785 pts_driver
->type
= TTY_DRIVER_TYPE_PTY
;
786 pts_driver
->subtype
= PTY_TYPE_SLAVE
;
787 pts_driver
->init_termios
= tty_std_termios
;
788 pts_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
789 pts_driver
->init_termios
.c_ispeed
= 38400;
790 pts_driver
->init_termios
.c_ospeed
= 38400;
791 pts_driver
->other
= ptm_driver
;
792 tty_set_operations(pts_driver
, &pty_unix98_ops
);
794 if (tty_register_driver(ptm_driver
))
795 panic("Couldn't register Unix98 ptm driver");
796 if (tty_register_driver(pts_driver
))
797 panic("Couldn't register Unix98 pts driver");
799 /* Now create the /dev/ptmx special device */
800 tty_default_fops(&ptmx_fops
);
801 ptmx_fops
.open
= ptmx_open
;
803 cdev_init(&ptmx_cdev
, &ptmx_fops
);
804 if (cdev_add(&ptmx_cdev
, MKDEV(TTYAUX_MAJOR
, 2), 1) ||
805 register_chrdev_region(MKDEV(TTYAUX_MAJOR
, 2), 1, "/dev/ptmx") < 0)
806 panic("Couldn't register /dev/ptmx driver");
807 device_create(tty_class
, NULL
, MKDEV(TTYAUX_MAJOR
, 2), NULL
, "ptmx");
811 static inline void unix98_pty_init(void) { }
814 static int __init
pty_init(void)
820 module_init(pty_init
);