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>
28 #ifdef CONFIG_UNIX98_PTYS
29 static struct tty_driver
*ptm_driver
;
30 static struct tty_driver
*pts_driver
;
31 static DEFINE_MUTEX(devpts_mutex
);
34 static void pty_close(struct tty_struct
*tty
, struct file
*filp
)
37 if (tty
->driver
->subtype
== PTY_TYPE_MASTER
)
38 WARN_ON(tty
->count
> 1);
40 if (test_bit(TTY_IO_ERROR
, &tty
->flags
))
45 set_bit(TTY_IO_ERROR
, &tty
->flags
);
46 wake_up_interruptible(&tty
->read_wait
);
47 wake_up_interruptible(&tty
->write_wait
);
49 /* Review - krefs on tty_link ?? */
52 set_bit(TTY_OTHER_CLOSED
, &tty
->link
->flags
);
53 wake_up_interruptible(&tty
->link
->read_wait
);
54 wake_up_interruptible(&tty
->link
->write_wait
);
55 if (tty
->driver
->subtype
== PTY_TYPE_MASTER
) {
56 set_bit(TTY_OTHER_CLOSED
, &tty
->flags
);
57 #ifdef CONFIG_UNIX98_PTYS
58 if (tty
->driver
== ptm_driver
) {
59 mutex_lock(&devpts_mutex
);
60 if (tty
->link
->driver_data
)
61 devpts_pty_kill(tty
->link
->driver_data
);
62 mutex_unlock(&devpts_mutex
);
66 tty_vhangup(tty
->link
);
72 * The unthrottle routine is called by the line discipline to signal
73 * that it can receive more characters. For PTY's, the TTY_THROTTLED
74 * flag is always set, to force the line discipline to always call the
75 * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE
76 * characters in the queue. This is necessary since each time this
77 * happens, we need to wake up any sleeping processes that could be
78 * (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
79 * for the pty buffer to be drained.
81 static void pty_unthrottle(struct tty_struct
*tty
)
83 tty_wakeup(tty
->link
);
84 set_bit(TTY_THROTTLED
, &tty
->flags
);
88 * pty_space - report space left for writing
89 * @to: tty we are writing into
91 * The tty buffers allow 64K but we sneak a peak and clip at 8K this
92 * allows a lot of overspill room for echo and other fun messes to
96 static int pty_space(struct tty_struct
*to
)
98 int n
= 8192 - to
->port
->buf
.memory_used
;
105 * pty_write - write to a pty
106 * @tty: the tty we write from
107 * @buf: kernel buffer of data
108 * @count: bytes to write
110 * Our "hardware" write method. Data is coming from the ldisc which
111 * may be in a non sleeping state. We simply throw this at the other
112 * end of the link as if we were an IRQ handler receiving stuff for
113 * the other side of the pty/tty pair.
116 static int pty_write(struct tty_struct
*tty
, const unsigned char *buf
, int c
)
118 struct tty_struct
*to
= tty
->link
;
124 /* Stuff the data into the input queue of the other end */
125 c
= tty_insert_flip_string(to
->port
, buf
, c
);
128 tty_flip_buffer_push(to
->port
);
136 * pty_write_room - write space
137 * @tty: tty we are writing from
139 * Report how many bytes the ldisc can send into the queue for
143 static int pty_write_room(struct tty_struct
*tty
)
147 return pty_space(tty
->link
);
151 * pty_chars_in_buffer - characters currently in our tx queue
154 * Report how much we have in the transmit queue. As everything is
155 * instantly at the other end this is easy to implement.
158 static int pty_chars_in_buffer(struct tty_struct
*tty
)
163 /* Set the lock flag on a pty */
164 static int pty_set_lock(struct tty_struct
*tty
, int __user
*arg
)
167 if (get_user(val
, arg
))
170 set_bit(TTY_PTY_LOCK
, &tty
->flags
);
172 clear_bit(TTY_PTY_LOCK
, &tty
->flags
);
176 static int pty_get_lock(struct tty_struct
*tty
, int __user
*arg
)
178 int locked
= test_bit(TTY_PTY_LOCK
, &tty
->flags
);
179 return put_user(locked
, arg
);
182 /* Set the packet mode on a pty */
183 static int pty_set_pktmode(struct tty_struct
*tty
, int __user
*arg
)
188 if (get_user(pktmode
, arg
))
191 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
195 tty
->link
->ctrl_status
= 0;
199 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
204 /* Get the packet mode of a pty */
205 static int pty_get_pktmode(struct tty_struct
*tty
, int __user
*arg
)
207 int pktmode
= tty
->packet
;
208 return put_user(pktmode
, arg
);
211 /* Send a signal to the slave */
212 static int pty_signal(struct tty_struct
*tty
, int sig
)
218 spin_lock_irqsave(&tty
->link
->ctrl_lock
, flags
);
219 pgrp
= get_pid(tty
->link
->pgrp
);
220 spin_unlock_irqrestore(&tty
->link
->ctrl_lock
, flags
);
222 kill_pgrp(pgrp
, sig
, 1);
228 static void pty_flush_buffer(struct tty_struct
*tty
)
230 struct tty_struct
*to
= tty
->link
;
235 /* tty_buffer_flush(to); FIXME */
237 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
238 tty
->ctrl_status
|= TIOCPKT_FLUSHWRITE
;
239 wake_up_interruptible(&to
->read_wait
);
240 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
244 static int pty_open(struct tty_struct
*tty
, struct file
*filp
)
246 if (!tty
|| !tty
->link
)
249 if (test_bit(TTY_OTHER_CLOSED
, &tty
->flags
))
251 if (test_bit(TTY_PTY_LOCK
, &tty
->link
->flags
))
253 if (tty
->driver
->subtype
== PTY_TYPE_SLAVE
&& tty
->link
->count
!= 1)
256 clear_bit(TTY_IO_ERROR
, &tty
->flags
);
257 clear_bit(TTY_OTHER_CLOSED
, &tty
->link
->flags
);
258 set_bit(TTY_THROTTLED
, &tty
->flags
);
262 set_bit(TTY_IO_ERROR
, &tty
->flags
);
266 static void pty_set_termios(struct tty_struct
*tty
,
267 struct ktermios
*old_termios
)
269 tty
->termios
.c_cflag
&= ~(CSIZE
| PARENB
);
270 tty
->termios
.c_cflag
|= (CS8
| CREAD
);
274 * pty_do_resize - resize event
275 * @tty: tty being resized
276 * @ws: window size being set.
278 * Update the termios variables and send the necessary signals to
279 * peform a terminal resize correctly
282 static int pty_resize(struct tty_struct
*tty
, struct winsize
*ws
)
284 struct pid
*pgrp
, *rpgrp
;
286 struct tty_struct
*pty
= tty
->link
;
288 /* For a PTY we need to lock the tty side */
289 mutex_lock(&tty
->termios_mutex
);
290 if (!memcmp(ws
, &tty
->winsize
, sizeof(*ws
)))
293 /* Get the PID values and reference them so we can
294 avoid holding the tty ctrl lock while sending signals.
295 We need to lock these individually however. */
297 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
298 pgrp
= get_pid(tty
->pgrp
);
299 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
301 spin_lock_irqsave(&pty
->ctrl_lock
, flags
);
302 rpgrp
= get_pid(pty
->pgrp
);
303 spin_unlock_irqrestore(&pty
->ctrl_lock
, flags
);
306 kill_pgrp(pgrp
, SIGWINCH
, 1);
307 if (rpgrp
!= pgrp
&& rpgrp
)
308 kill_pgrp(rpgrp
, SIGWINCH
, 1);
314 pty
->winsize
= *ws
; /* Never used so will go away soon */
316 mutex_unlock(&tty
->termios_mutex
);
321 * pty_common_install - set up the pty pair
322 * @driver: the pty driver
323 * @tty: the tty being instantiated
324 * @bool: legacy, true if this is BSD style
326 * Perform the initial set up for the tty/pty pair. Called from the
327 * tty layer when the port is first opened.
329 * Locking: the caller must hold the tty_mutex
331 static int pty_common_install(struct tty_driver
*driver
, struct tty_struct
*tty
,
334 struct tty_struct
*o_tty
;
335 struct tty_port
*ports
[2];
336 int idx
= tty
->index
;
337 int retval
= -ENOMEM
;
339 o_tty
= alloc_tty_struct();
342 ports
[0] = kmalloc(sizeof **ports
, GFP_KERNEL
);
343 ports
[1] = kmalloc(sizeof **ports
, GFP_KERNEL
);
344 if (!ports
[0] || !ports
[1])
346 if (!try_module_get(driver
->other
->owner
)) {
347 /* This cannot in fact currently happen */
350 initialize_tty_struct(o_tty
, driver
->other
, idx
);
353 /* We always use new tty termios data so we can do this
355 retval
= tty_init_termios(tty
);
359 retval
= tty_init_termios(o_tty
);
361 goto err_free_termios
;
363 driver
->other
->ttys
[idx
] = o_tty
;
364 driver
->ttys
[idx
] = tty
;
366 memset(&tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
367 tty
->termios
= driver
->init_termios
;
368 memset(&o_tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
369 o_tty
->termios
= driver
->other
->init_termios
;
373 * Everything allocated ... set up the o_tty structure.
375 tty_driver_kref_get(driver
->other
);
376 if (driver
->subtype
== PTY_TYPE_MASTER
)
378 /* Establish the links in both directions */
381 tty_port_init(ports
[0]);
382 tty_port_init(ports
[1]);
383 o_tty
->port
= ports
[0];
384 tty
->port
= ports
[1];
385 o_tty
->port
->itty
= o_tty
;
387 tty_driver_kref_get(driver
);
392 tty_free_termios(tty
);
394 deinitialize_tty_struct(o_tty
);
395 module_put(o_tty
->driver
->owner
);
399 free_tty_struct(o_tty
);
404 static void pty_cleanup(struct tty_struct
*tty
)
406 tty_port_put(tty
->port
);
409 /* Traditional BSD devices */
410 #ifdef CONFIG_LEGACY_PTYS
412 static int pty_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
414 return pty_common_install(driver
, tty
, true);
417 static void pty_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
419 struct tty_struct
*pair
= tty
->link
;
420 driver
->ttys
[tty
->index
] = NULL
;
422 pair
->driver
->ttys
[pair
->index
] = NULL
;
425 static int pty_bsd_ioctl(struct tty_struct
*tty
,
426 unsigned int cmd
, unsigned long arg
)
429 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
430 return pty_set_lock(tty
, (int __user
*) arg
);
431 case TIOCGPTLCK
: /* Get PT Lock status */
432 return pty_get_lock(tty
, (int __user
*)arg
);
433 case TIOCPKT
: /* Set PT packet mode */
434 return pty_set_pktmode(tty
, (int __user
*)arg
);
435 case TIOCGPKT
: /* Get PT packet mode */
436 return pty_get_pktmode(tty
, (int __user
*)arg
);
437 case TIOCSIG
: /* Send signal to other side of pty */
438 return pty_signal(tty
, (int) arg
);
439 case TIOCGPTN
: /* TTY returns ENOTTY, but glibc expects EINVAL here */
445 static int legacy_count
= CONFIG_LEGACY_PTY_COUNT
;
446 module_param(legacy_count
, int, 0);
449 * The master side of a pty can do TIOCSPTLCK and thus
452 static const struct tty_operations master_pty_ops_bsd
= {
453 .install
= pty_install
,
457 .write_room
= pty_write_room
,
458 .flush_buffer
= pty_flush_buffer
,
459 .chars_in_buffer
= pty_chars_in_buffer
,
460 .unthrottle
= pty_unthrottle
,
461 .set_termios
= pty_set_termios
,
462 .ioctl
= pty_bsd_ioctl
,
463 .cleanup
= pty_cleanup
,
464 .resize
= pty_resize
,
468 static const struct tty_operations slave_pty_ops_bsd
= {
469 .install
= pty_install
,
473 .write_room
= pty_write_room
,
474 .flush_buffer
= pty_flush_buffer
,
475 .chars_in_buffer
= pty_chars_in_buffer
,
476 .unthrottle
= pty_unthrottle
,
477 .set_termios
= pty_set_termios
,
478 .cleanup
= pty_cleanup
,
479 .resize
= pty_resize
,
483 static void __init
legacy_pty_init(void)
485 struct tty_driver
*pty_driver
, *pty_slave_driver
;
487 if (legacy_count
<= 0)
490 pty_driver
= tty_alloc_driver(legacy_count
,
491 TTY_DRIVER_RESET_TERMIOS
|
492 TTY_DRIVER_REAL_RAW
|
493 TTY_DRIVER_DYNAMIC_ALLOC
);
494 if (IS_ERR(pty_driver
))
495 panic("Couldn't allocate pty driver");
497 pty_slave_driver
= tty_alloc_driver(legacy_count
,
498 TTY_DRIVER_RESET_TERMIOS
|
499 TTY_DRIVER_REAL_RAW
|
500 TTY_DRIVER_DYNAMIC_ALLOC
);
501 if (IS_ERR(pty_slave_driver
))
502 panic("Couldn't allocate pty slave driver");
504 pty_driver
->driver_name
= "pty_master";
505 pty_driver
->name
= "pty";
506 pty_driver
->major
= PTY_MASTER_MAJOR
;
507 pty_driver
->minor_start
= 0;
508 pty_driver
->type
= TTY_DRIVER_TYPE_PTY
;
509 pty_driver
->subtype
= PTY_TYPE_MASTER
;
510 pty_driver
->init_termios
= tty_std_termios
;
511 pty_driver
->init_termios
.c_iflag
= 0;
512 pty_driver
->init_termios
.c_oflag
= 0;
513 pty_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
514 pty_driver
->init_termios
.c_lflag
= 0;
515 pty_driver
->init_termios
.c_ispeed
= 38400;
516 pty_driver
->init_termios
.c_ospeed
= 38400;
517 pty_driver
->other
= pty_slave_driver
;
518 tty_set_operations(pty_driver
, &master_pty_ops_bsd
);
520 pty_slave_driver
->driver_name
= "pty_slave";
521 pty_slave_driver
->name
= "ttyp";
522 pty_slave_driver
->major
= PTY_SLAVE_MAJOR
;
523 pty_slave_driver
->minor_start
= 0;
524 pty_slave_driver
->type
= TTY_DRIVER_TYPE_PTY
;
525 pty_slave_driver
->subtype
= PTY_TYPE_SLAVE
;
526 pty_slave_driver
->init_termios
= tty_std_termios
;
527 pty_slave_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
528 pty_slave_driver
->init_termios
.c_ispeed
= 38400;
529 pty_slave_driver
->init_termios
.c_ospeed
= 38400;
530 pty_slave_driver
->other
= pty_driver
;
531 tty_set_operations(pty_slave_driver
, &slave_pty_ops_bsd
);
533 if (tty_register_driver(pty_driver
))
534 panic("Couldn't register pty driver");
535 if (tty_register_driver(pty_slave_driver
))
536 panic("Couldn't register pty slave driver");
539 static inline void legacy_pty_init(void) { }
543 #ifdef CONFIG_UNIX98_PTYS
545 static struct cdev ptmx_cdev
;
547 static int pty_unix98_ioctl(struct tty_struct
*tty
,
548 unsigned int cmd
, unsigned long arg
)
551 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
552 return pty_set_lock(tty
, (int __user
*)arg
);
553 case TIOCGPTLCK
: /* Get PT Lock status */
554 return pty_get_lock(tty
, (int __user
*)arg
);
555 case TIOCPKT
: /* Set PT packet mode */
556 return pty_set_pktmode(tty
, (int __user
*)arg
);
557 case TIOCGPKT
: /* Get PT packet mode */
558 return pty_get_pktmode(tty
, (int __user
*)arg
);
559 case TIOCGPTN
: /* Get PT Number */
560 return put_user(tty
->index
, (unsigned int __user
*)arg
);
561 case TIOCSIG
: /* Send signal to other side of pty */
562 return pty_signal(tty
, (int) arg
);
569 * ptm_unix98_lookup - find a pty master
570 * @driver: ptm driver
573 * Look up a pty master device. Called under the tty_mutex for now.
574 * This provides our locking.
577 static struct tty_struct
*ptm_unix98_lookup(struct tty_driver
*driver
,
578 struct inode
*ptm_inode
, int idx
)
580 /* Master must be open via /dev/ptmx */
581 return ERR_PTR(-EIO
);
585 * pts_unix98_lookup - find a pty slave
586 * @driver: pts driver
589 * Look up a pty master device. Called under the tty_mutex for now.
590 * This provides our locking for the tty pointer.
593 static struct tty_struct
*pts_unix98_lookup(struct tty_driver
*driver
,
594 struct inode
*pts_inode
, int idx
)
596 struct tty_struct
*tty
;
598 mutex_lock(&devpts_mutex
);
599 tty
= devpts_get_priv(pts_inode
);
600 mutex_unlock(&devpts_mutex
);
601 /* Master must be open before slave */
603 return ERR_PTR(-EIO
);
607 /* We have no need to install and remove our tty objects as devpts does all
610 static int pty_unix98_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
612 return pty_common_install(driver
, tty
, false);
615 static void pty_unix98_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
619 /* this is called once with whichever end is closed last */
620 static void pty_unix98_shutdown(struct tty_struct
*tty
)
622 devpts_kill_index(tty
->driver_data
, tty
->index
);
625 static const struct tty_operations ptm_unix98_ops
= {
626 .lookup
= ptm_unix98_lookup
,
627 .install
= pty_unix98_install
,
628 .remove
= pty_unix98_remove
,
632 .write_room
= pty_write_room
,
633 .flush_buffer
= pty_flush_buffer
,
634 .chars_in_buffer
= pty_chars_in_buffer
,
635 .unthrottle
= pty_unthrottle
,
636 .set_termios
= pty_set_termios
,
637 .ioctl
= pty_unix98_ioctl
,
638 .resize
= pty_resize
,
639 .shutdown
= pty_unix98_shutdown
,
640 .cleanup
= pty_cleanup
643 static const struct tty_operations pty_unix98_ops
= {
644 .lookup
= pts_unix98_lookup
,
645 .install
= pty_unix98_install
,
646 .remove
= pty_unix98_remove
,
650 .write_room
= pty_write_room
,
651 .flush_buffer
= pty_flush_buffer
,
652 .chars_in_buffer
= pty_chars_in_buffer
,
653 .unthrottle
= pty_unthrottle
,
654 .set_termios
= pty_set_termios
,
655 .shutdown
= pty_unix98_shutdown
,
656 .cleanup
= pty_cleanup
,
660 * ptmx_open - open a unix 98 pty master
661 * @inode: inode of device file
662 * @filp: file pointer to tty
664 * Allocate a unix98 pty master device from the ptmx driver.
666 * Locking: tty_mutex protects the init_dev work. tty->count should
668 * allocated_ptys_lock handles the list of free pty numbers
671 static int ptmx_open(struct inode
*inode
, struct file
*filp
)
673 struct tty_struct
*tty
;
674 struct inode
*slave_inode
;
678 nonseekable_open(inode
, filp
);
680 /* We refuse fsnotify events on ptmx, since it's a shared resource */
681 filp
->f_mode
|= FMODE_NONOTIFY
;
683 retval
= tty_alloc_file(filp
);
687 /* find a device that is not in use. */
688 mutex_lock(&devpts_mutex
);
689 index
= devpts_new_index(inode
);
692 mutex_unlock(&devpts_mutex
);
696 mutex_unlock(&devpts_mutex
);
698 mutex_lock(&tty_mutex
);
699 tty
= tty_init_dev(ptm_driver
, index
);
702 retval
= PTR_ERR(tty
);
706 /* The tty returned here is locked so we can safely
708 mutex_unlock(&tty_mutex
);
710 set_bit(TTY_PTY_LOCK
, &tty
->flags
); /* LOCK THE SLAVE */
711 tty
->driver_data
= inode
;
713 tty_add_file(tty
, filp
);
715 slave_inode
= devpts_pty_new(inode
,
716 MKDEV(UNIX98_PTY_SLAVE_MAJOR
, index
), index
,
718 if (IS_ERR(slave_inode
)) {
719 retval
= PTR_ERR(slave_inode
);
722 tty
->link
->driver_data
= slave_inode
;
724 retval
= ptm_driver
->ops
->open(tty
, filp
);
732 tty_release(inode
, filp
);
735 mutex_unlock(&tty_mutex
);
736 devpts_kill_index(inode
, index
);
742 static struct file_operations ptmx_fops
;
744 static void __init
unix98_pty_init(void)
746 ptm_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
747 TTY_DRIVER_RESET_TERMIOS
|
748 TTY_DRIVER_REAL_RAW
|
749 TTY_DRIVER_DYNAMIC_DEV
|
750 TTY_DRIVER_DEVPTS_MEM
|
751 TTY_DRIVER_DYNAMIC_ALLOC
);
752 if (IS_ERR(ptm_driver
))
753 panic("Couldn't allocate Unix98 ptm driver");
754 pts_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
755 TTY_DRIVER_RESET_TERMIOS
|
756 TTY_DRIVER_REAL_RAW
|
757 TTY_DRIVER_DYNAMIC_DEV
|
758 TTY_DRIVER_DEVPTS_MEM
|
759 TTY_DRIVER_DYNAMIC_ALLOC
);
760 if (IS_ERR(pts_driver
))
761 panic("Couldn't allocate Unix98 pts driver");
763 ptm_driver
->driver_name
= "pty_master";
764 ptm_driver
->name
= "ptm";
765 ptm_driver
->major
= UNIX98_PTY_MASTER_MAJOR
;
766 ptm_driver
->minor_start
= 0;
767 ptm_driver
->type
= TTY_DRIVER_TYPE_PTY
;
768 ptm_driver
->subtype
= PTY_TYPE_MASTER
;
769 ptm_driver
->init_termios
= tty_std_termios
;
770 ptm_driver
->init_termios
.c_iflag
= 0;
771 ptm_driver
->init_termios
.c_oflag
= 0;
772 ptm_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
773 ptm_driver
->init_termios
.c_lflag
= 0;
774 ptm_driver
->init_termios
.c_ispeed
= 38400;
775 ptm_driver
->init_termios
.c_ospeed
= 38400;
776 ptm_driver
->other
= pts_driver
;
777 tty_set_operations(ptm_driver
, &ptm_unix98_ops
);
779 pts_driver
->driver_name
= "pty_slave";
780 pts_driver
->name
= "pts";
781 pts_driver
->major
= UNIX98_PTY_SLAVE_MAJOR
;
782 pts_driver
->minor_start
= 0;
783 pts_driver
->type
= TTY_DRIVER_TYPE_PTY
;
784 pts_driver
->subtype
= PTY_TYPE_SLAVE
;
785 pts_driver
->init_termios
= tty_std_termios
;
786 pts_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
787 pts_driver
->init_termios
.c_ispeed
= 38400;
788 pts_driver
->init_termios
.c_ospeed
= 38400;
789 pts_driver
->other
= ptm_driver
;
790 tty_set_operations(pts_driver
, &pty_unix98_ops
);
792 if (tty_register_driver(ptm_driver
))
793 panic("Couldn't register Unix98 ptm driver");
794 if (tty_register_driver(pts_driver
))
795 panic("Couldn't register Unix98 pts driver");
797 /* Now create the /dev/ptmx special device */
798 tty_default_fops(&ptmx_fops
);
799 ptmx_fops
.open
= ptmx_open
;
801 cdev_init(&ptmx_cdev
, &ptmx_fops
);
802 if (cdev_add(&ptmx_cdev
, MKDEV(TTYAUX_MAJOR
, 2), 1) ||
803 register_chrdev_region(MKDEV(TTYAUX_MAJOR
, 2), 1, "/dev/ptmx") < 0)
804 panic("Couldn't register /dev/ptmx driver");
805 device_create(tty_class
, NULL
, MKDEV(TTYAUX_MAJOR
, 2), NULL
, "ptmx");
809 static inline void unix98_pty_init(void) { }
812 static int __init
pty_init(void)
818 module_init(pty_init
);