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
);
51 /* Review - krefs on tty_link ?? */
54 set_bit(TTY_OTHER_CLOSED
, &tty
->link
->flags
);
55 wake_up_interruptible(&tty
->link
->read_wait
);
56 wake_up_interruptible(&tty
->link
->write_wait
);
57 if (tty
->driver
->subtype
== PTY_TYPE_MASTER
) {
58 set_bit(TTY_OTHER_CLOSED
, &tty
->flags
);
59 #ifdef CONFIG_UNIX98_PTYS
60 if (tty
->driver
== ptm_driver
) {
61 mutex_lock(&devpts_mutex
);
62 if (tty
->link
->driver_data
)
63 devpts_pty_kill(tty
->link
->driver_data
);
64 mutex_unlock(&devpts_mutex
);
68 tty_vhangup(tty
->link
);
74 * The unthrottle routine is called by the line discipline to signal
75 * that it can receive more characters. For PTY's, the TTY_THROTTLED
76 * flag is always set, to force the line discipline to always call the
77 * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE
78 * characters in the queue. This is necessary since each time this
79 * happens, we need to wake up any sleeping processes that could be
80 * (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
81 * for the pty buffer to be drained.
83 static void pty_unthrottle(struct tty_struct
*tty
)
85 tty_wakeup(tty
->link
);
86 set_bit(TTY_THROTTLED
, &tty
->flags
);
90 * pty_space - report space left for writing
91 * @to: tty we are writing into
93 * Limit the buffer space used by ptys to 8k.
96 static int pty_space(struct tty_struct
*to
)
98 int n
= tty_buffer_space_avail(to
->port
);
103 * pty_write - write to a pty
104 * @tty: the tty we write from
105 * @buf: kernel buffer of data
106 * @count: bytes to write
108 * Our "hardware" write method. Data is coming from the ldisc which
109 * may be in a non sleeping state. We simply throw this at the other
110 * end of the link as if we were an IRQ handler receiving stuff for
111 * the other side of the pty/tty pair.
114 static int pty_write(struct tty_struct
*tty
, const unsigned char *buf
, int c
)
116 struct tty_struct
*to
= tty
->link
;
122 /* Stuff the data into the input queue of the other end */
123 c
= tty_insert_flip_string(to
->port
, buf
, c
);
126 tty_flip_buffer_push(to
->port
);
132 * pty_write_room - write space
133 * @tty: tty we are writing from
135 * Report how many bytes the ldisc can send into the queue for
139 static int pty_write_room(struct tty_struct
*tty
)
143 return pty_space(tty
->link
);
147 * pty_chars_in_buffer - characters currently in our tx queue
150 * Report how much we have in the transmit queue. As everything is
151 * instantly at the other end this is easy to implement.
154 static int pty_chars_in_buffer(struct tty_struct
*tty
)
159 /* Set the lock flag on a pty */
160 static int pty_set_lock(struct tty_struct
*tty
, int __user
*arg
)
163 if (get_user(val
, arg
))
166 set_bit(TTY_PTY_LOCK
, &tty
->flags
);
168 clear_bit(TTY_PTY_LOCK
, &tty
->flags
);
172 static int pty_get_lock(struct tty_struct
*tty
, int __user
*arg
)
174 int locked
= test_bit(TTY_PTY_LOCK
, &tty
->flags
);
175 return put_user(locked
, arg
);
178 /* Set the packet mode on a pty */
179 static int pty_set_pktmode(struct tty_struct
*tty
, int __user
*arg
)
184 if (get_user(pktmode
, arg
))
187 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
191 tty
->link
->ctrl_status
= 0;
195 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
200 /* Get the packet mode of a pty */
201 static int pty_get_pktmode(struct tty_struct
*tty
, int __user
*arg
)
203 int pktmode
= tty
->packet
;
204 return put_user(pktmode
, arg
);
207 /* Send a signal to the slave */
208 static int pty_signal(struct tty_struct
*tty
, int sig
)
213 pgrp
= tty_get_pgrp(tty
->link
);
215 kill_pgrp(pgrp
, sig
, 1);
221 static void pty_flush_buffer(struct tty_struct
*tty
)
223 struct tty_struct
*to
= tty
->link
;
228 /* tty_buffer_flush(to); FIXME */
230 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
231 tty
->ctrl_status
|= TIOCPKT_FLUSHWRITE
;
232 wake_up_interruptible(&to
->read_wait
);
233 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
237 static int pty_open(struct tty_struct
*tty
, struct file
*filp
)
239 if (!tty
|| !tty
->link
)
242 if (test_bit(TTY_OTHER_CLOSED
, &tty
->flags
))
244 if (test_bit(TTY_PTY_LOCK
, &tty
->link
->flags
))
246 if (tty
->driver
->subtype
== PTY_TYPE_SLAVE
&& tty
->link
->count
!= 1)
249 clear_bit(TTY_IO_ERROR
, &tty
->flags
);
250 clear_bit(TTY_OTHER_CLOSED
, &tty
->link
->flags
);
251 set_bit(TTY_THROTTLED
, &tty
->flags
);
255 set_bit(TTY_IO_ERROR
, &tty
->flags
);
259 static void pty_set_termios(struct tty_struct
*tty
,
260 struct ktermios
*old_termios
)
262 tty
->termios
.c_cflag
&= ~(CSIZE
| PARENB
);
263 tty
->termios
.c_cflag
|= (CS8
| CREAD
);
267 * pty_do_resize - resize event
268 * @tty: tty being resized
269 * @ws: window size being set.
271 * Update the termios variables and send the necessary signals to
272 * peform a terminal resize correctly
275 static int pty_resize(struct tty_struct
*tty
, struct winsize
*ws
)
277 struct pid
*pgrp
, *rpgrp
;
278 struct tty_struct
*pty
= tty
->link
;
280 /* For a PTY we need to lock the tty side */
281 mutex_lock(&tty
->winsize_mutex
);
282 if (!memcmp(ws
, &tty
->winsize
, sizeof(*ws
)))
285 /* Signal the foreground process group of both ptys */
286 pgrp
= tty_get_pgrp(tty
);
287 rpgrp
= tty_get_pgrp(pty
);
290 kill_pgrp(pgrp
, SIGWINCH
, 1);
291 if (rpgrp
!= pgrp
&& rpgrp
)
292 kill_pgrp(rpgrp
, SIGWINCH
, 1);
298 pty
->winsize
= *ws
; /* Never used so will go away soon */
300 mutex_unlock(&tty
->winsize_mutex
);
305 * pty_start - start() handler
306 * pty_stop - stop() handler
307 * @tty: tty being flow-controlled
309 * Propagates the TIOCPKT status to the master pty.
311 * NB: only the master pty can be in packet mode so only the slave
312 * needs start()/stop() handlers
314 static void pty_start(struct tty_struct
*tty
)
318 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
319 if (tty
->link
&& tty
->link
->packet
) {
320 tty
->ctrl_status
&= ~TIOCPKT_STOP
;
321 tty
->ctrl_status
|= TIOCPKT_START
;
322 wake_up_interruptible_poll(&tty
->link
->read_wait
, POLLIN
);
324 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
327 static void pty_stop(struct tty_struct
*tty
)
331 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
332 if (tty
->link
&& tty
->link
->packet
) {
333 tty
->ctrl_status
&= ~TIOCPKT_START
;
334 tty
->ctrl_status
|= TIOCPKT_STOP
;
335 wake_up_interruptible_poll(&tty
->link
->read_wait
, POLLIN
);
337 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
341 * pty_common_install - set up the pty pair
342 * @driver: the pty driver
343 * @tty: the tty being instantiated
344 * @legacy: true if this is BSD style
346 * Perform the initial set up for the tty/pty pair. Called from the
347 * tty layer when the port is first opened.
349 * Locking: the caller must hold the tty_mutex
351 static int pty_common_install(struct tty_driver
*driver
, struct tty_struct
*tty
,
354 struct tty_struct
*o_tty
;
355 struct tty_port
*ports
[2];
356 int idx
= tty
->index
;
357 int retval
= -ENOMEM
;
359 ports
[0] = kmalloc(sizeof **ports
, GFP_KERNEL
);
360 ports
[1] = kmalloc(sizeof **ports
, GFP_KERNEL
);
361 if (!ports
[0] || !ports
[1])
363 if (!try_module_get(driver
->other
->owner
)) {
364 /* This cannot in fact currently happen */
367 o_tty
= alloc_tty_struct(driver
->other
, idx
);
372 /* We always use new tty termios data so we can do this
374 retval
= tty_init_termios(tty
);
378 retval
= tty_init_termios(o_tty
);
380 goto err_free_termios
;
382 driver
->other
->ttys
[idx
] = o_tty
;
383 driver
->ttys
[idx
] = tty
;
385 memset(&tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
386 tty
->termios
= driver
->init_termios
;
387 memset(&o_tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
388 o_tty
->termios
= driver
->other
->init_termios
;
392 * Everything allocated ... set up the o_tty structure.
394 tty_driver_kref_get(driver
->other
);
395 if (driver
->subtype
== PTY_TYPE_MASTER
)
397 /* Establish the links in both directions */
400 tty_port_init(ports
[0]);
401 tty_port_init(ports
[1]);
402 o_tty
->port
= ports
[0];
403 tty
->port
= ports
[1];
404 o_tty
->port
->itty
= o_tty
;
406 tty_driver_kref_get(driver
);
411 tty_free_termios(tty
);
413 deinitialize_tty_struct(o_tty
);
414 free_tty_struct(o_tty
);
416 module_put(driver
->other
->owner
);
423 static void pty_cleanup(struct tty_struct
*tty
)
425 tty_port_put(tty
->port
);
428 /* Traditional BSD devices */
429 #ifdef CONFIG_LEGACY_PTYS
431 static int pty_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
433 return pty_common_install(driver
, tty
, true);
436 static void pty_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
438 struct tty_struct
*pair
= tty
->link
;
439 driver
->ttys
[tty
->index
] = NULL
;
441 pair
->driver
->ttys
[pair
->index
] = NULL
;
444 static int pty_bsd_ioctl(struct tty_struct
*tty
,
445 unsigned int cmd
, unsigned long arg
)
448 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
449 return pty_set_lock(tty
, (int __user
*) arg
);
450 case TIOCGPTLCK
: /* Get PT Lock status */
451 return pty_get_lock(tty
, (int __user
*)arg
);
452 case TIOCPKT
: /* Set PT packet mode */
453 return pty_set_pktmode(tty
, (int __user
*)arg
);
454 case TIOCGPKT
: /* Get PT packet mode */
455 return pty_get_pktmode(tty
, (int __user
*)arg
);
456 case TIOCSIG
: /* Send signal to other side of pty */
457 return pty_signal(tty
, (int) arg
);
458 case TIOCGPTN
: /* TTY returns ENOTTY, but glibc expects EINVAL here */
464 static int legacy_count
= CONFIG_LEGACY_PTY_COUNT
;
465 module_param(legacy_count
, int, 0);
468 * The master side of a pty can do TIOCSPTLCK and thus
471 static const struct tty_operations master_pty_ops_bsd
= {
472 .install
= pty_install
,
476 .write_room
= pty_write_room
,
477 .flush_buffer
= pty_flush_buffer
,
478 .chars_in_buffer
= pty_chars_in_buffer
,
479 .unthrottle
= pty_unthrottle
,
480 .ioctl
= pty_bsd_ioctl
,
481 .cleanup
= pty_cleanup
,
482 .resize
= pty_resize
,
486 static const struct tty_operations slave_pty_ops_bsd
= {
487 .install
= pty_install
,
491 .write_room
= pty_write_room
,
492 .flush_buffer
= pty_flush_buffer
,
493 .chars_in_buffer
= pty_chars_in_buffer
,
494 .unthrottle
= pty_unthrottle
,
495 .set_termios
= pty_set_termios
,
496 .cleanup
= pty_cleanup
,
497 .resize
= pty_resize
,
503 static void __init
legacy_pty_init(void)
505 struct tty_driver
*pty_driver
, *pty_slave_driver
;
507 if (legacy_count
<= 0)
510 pty_driver
= tty_alloc_driver(legacy_count
,
511 TTY_DRIVER_RESET_TERMIOS
|
512 TTY_DRIVER_REAL_RAW
|
513 TTY_DRIVER_DYNAMIC_ALLOC
);
514 if (IS_ERR(pty_driver
))
515 panic("Couldn't allocate pty driver");
517 pty_slave_driver
= tty_alloc_driver(legacy_count
,
518 TTY_DRIVER_RESET_TERMIOS
|
519 TTY_DRIVER_REAL_RAW
|
520 TTY_DRIVER_DYNAMIC_ALLOC
);
521 if (IS_ERR(pty_slave_driver
))
522 panic("Couldn't allocate pty slave driver");
524 pty_driver
->driver_name
= "pty_master";
525 pty_driver
->name
= "pty";
526 pty_driver
->major
= PTY_MASTER_MAJOR
;
527 pty_driver
->minor_start
= 0;
528 pty_driver
->type
= TTY_DRIVER_TYPE_PTY
;
529 pty_driver
->subtype
= PTY_TYPE_MASTER
;
530 pty_driver
->init_termios
= tty_std_termios
;
531 pty_driver
->init_termios
.c_iflag
= 0;
532 pty_driver
->init_termios
.c_oflag
= 0;
533 pty_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
534 pty_driver
->init_termios
.c_lflag
= 0;
535 pty_driver
->init_termios
.c_ispeed
= 38400;
536 pty_driver
->init_termios
.c_ospeed
= 38400;
537 pty_driver
->other
= pty_slave_driver
;
538 tty_set_operations(pty_driver
, &master_pty_ops_bsd
);
540 pty_slave_driver
->driver_name
= "pty_slave";
541 pty_slave_driver
->name
= "ttyp";
542 pty_slave_driver
->major
= PTY_SLAVE_MAJOR
;
543 pty_slave_driver
->minor_start
= 0;
544 pty_slave_driver
->type
= TTY_DRIVER_TYPE_PTY
;
545 pty_slave_driver
->subtype
= PTY_TYPE_SLAVE
;
546 pty_slave_driver
->init_termios
= tty_std_termios
;
547 pty_slave_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
548 pty_slave_driver
->init_termios
.c_ispeed
= 38400;
549 pty_slave_driver
->init_termios
.c_ospeed
= 38400;
550 pty_slave_driver
->other
= pty_driver
;
551 tty_set_operations(pty_slave_driver
, &slave_pty_ops_bsd
);
553 if (tty_register_driver(pty_driver
))
554 panic("Couldn't register pty driver");
555 if (tty_register_driver(pty_slave_driver
))
556 panic("Couldn't register pty slave driver");
559 static inline void legacy_pty_init(void) { }
563 #ifdef CONFIG_UNIX98_PTYS
565 static struct cdev ptmx_cdev
;
567 static int pty_unix98_ioctl(struct tty_struct
*tty
,
568 unsigned int cmd
, unsigned long arg
)
571 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
572 return pty_set_lock(tty
, (int __user
*)arg
);
573 case TIOCGPTLCK
: /* Get PT Lock status */
574 return pty_get_lock(tty
, (int __user
*)arg
);
575 case TIOCPKT
: /* Set PT packet mode */
576 return pty_set_pktmode(tty
, (int __user
*)arg
);
577 case TIOCGPKT
: /* Get PT packet mode */
578 return pty_get_pktmode(tty
, (int __user
*)arg
);
579 case TIOCGPTN
: /* Get PT Number */
580 return put_user(tty
->index
, (unsigned int __user
*)arg
);
581 case TIOCSIG
: /* Send signal to other side of pty */
582 return pty_signal(tty
, (int) arg
);
589 * ptm_unix98_lookup - find a pty master
590 * @driver: ptm driver
593 * Look up a pty master device. Called under the tty_mutex for now.
594 * This provides our locking.
597 static struct tty_struct
*ptm_unix98_lookup(struct tty_driver
*driver
,
598 struct inode
*ptm_inode
, int idx
)
600 /* Master must be open via /dev/ptmx */
601 return ERR_PTR(-EIO
);
605 * pts_unix98_lookup - find a pty slave
606 * @driver: pts driver
609 * Look up a pty master device. Called under the tty_mutex for now.
610 * This provides our locking for the tty pointer.
613 static struct tty_struct
*pts_unix98_lookup(struct tty_driver
*driver
,
614 struct inode
*pts_inode
, int idx
)
616 struct tty_struct
*tty
;
618 mutex_lock(&devpts_mutex
);
619 tty
= devpts_get_priv(pts_inode
);
620 mutex_unlock(&devpts_mutex
);
621 /* Master must be open before slave */
623 return ERR_PTR(-EIO
);
627 /* We have no need to install and remove our tty objects as devpts does all
630 static int pty_unix98_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
632 return pty_common_install(driver
, tty
, false);
635 static void pty_unix98_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
639 /* this is called once with whichever end is closed last */
640 static void pty_unix98_shutdown(struct tty_struct
*tty
)
642 devpts_kill_index(tty
->driver_data
, tty
->index
);
645 static const struct tty_operations ptm_unix98_ops
= {
646 .lookup
= ptm_unix98_lookup
,
647 .install
= pty_unix98_install
,
648 .remove
= pty_unix98_remove
,
652 .write_room
= pty_write_room
,
653 .flush_buffer
= pty_flush_buffer
,
654 .chars_in_buffer
= pty_chars_in_buffer
,
655 .unthrottle
= pty_unthrottle
,
656 .ioctl
= pty_unix98_ioctl
,
657 .resize
= pty_resize
,
658 .shutdown
= pty_unix98_shutdown
,
659 .cleanup
= pty_cleanup
662 static const struct tty_operations pty_unix98_ops
= {
663 .lookup
= pts_unix98_lookup
,
664 .install
= pty_unix98_install
,
665 .remove
= pty_unix98_remove
,
669 .write_room
= pty_write_room
,
670 .flush_buffer
= pty_flush_buffer
,
671 .chars_in_buffer
= pty_chars_in_buffer
,
672 .unthrottle
= pty_unthrottle
,
673 .set_termios
= pty_set_termios
,
676 .shutdown
= pty_unix98_shutdown
,
677 .cleanup
= pty_cleanup
,
681 * ptmx_open - open a unix 98 pty master
682 * @inode: inode of device file
683 * @filp: file pointer to tty
685 * Allocate a unix98 pty master device from the ptmx driver.
687 * Locking: tty_mutex protects the init_dev work. tty->count should
689 * allocated_ptys_lock handles the list of free pty numbers
692 static int ptmx_open(struct inode
*inode
, struct file
*filp
)
694 struct tty_struct
*tty
;
695 struct inode
*slave_inode
;
699 nonseekable_open(inode
, filp
);
701 /* We refuse fsnotify events on ptmx, since it's a shared resource */
702 filp
->f_mode
|= FMODE_NONOTIFY
;
704 retval
= tty_alloc_file(filp
);
708 /* find a device that is not in use. */
709 mutex_lock(&devpts_mutex
);
710 index
= devpts_new_index(inode
);
713 mutex_unlock(&devpts_mutex
);
717 mutex_unlock(&devpts_mutex
);
719 mutex_lock(&tty_mutex
);
720 tty
= tty_init_dev(ptm_driver
, index
);
723 retval
= PTR_ERR(tty
);
727 /* The tty returned here is locked so we can safely
729 mutex_unlock(&tty_mutex
);
731 set_bit(TTY_PTY_LOCK
, &tty
->flags
); /* LOCK THE SLAVE */
732 tty
->driver_data
= inode
;
734 tty_add_file(tty
, filp
);
736 slave_inode
= devpts_pty_new(inode
,
737 MKDEV(UNIX98_PTY_SLAVE_MAJOR
, index
), index
,
739 if (IS_ERR(slave_inode
)) {
740 retval
= PTR_ERR(slave_inode
);
743 tty
->link
->driver_data
= slave_inode
;
745 retval
= ptm_driver
->ops
->open(tty
, filp
);
753 tty_release(inode
, filp
);
756 mutex_unlock(&tty_mutex
);
757 devpts_kill_index(inode
, index
);
763 static struct file_operations ptmx_fops
;
765 static void __init
unix98_pty_init(void)
767 ptm_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
768 TTY_DRIVER_RESET_TERMIOS
|
769 TTY_DRIVER_REAL_RAW
|
770 TTY_DRIVER_DYNAMIC_DEV
|
771 TTY_DRIVER_DEVPTS_MEM
|
772 TTY_DRIVER_DYNAMIC_ALLOC
);
773 if (IS_ERR(ptm_driver
))
774 panic("Couldn't allocate Unix98 ptm driver");
775 pts_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
776 TTY_DRIVER_RESET_TERMIOS
|
777 TTY_DRIVER_REAL_RAW
|
778 TTY_DRIVER_DYNAMIC_DEV
|
779 TTY_DRIVER_DEVPTS_MEM
|
780 TTY_DRIVER_DYNAMIC_ALLOC
);
781 if (IS_ERR(pts_driver
))
782 panic("Couldn't allocate Unix98 pts driver");
784 ptm_driver
->driver_name
= "pty_master";
785 ptm_driver
->name
= "ptm";
786 ptm_driver
->major
= UNIX98_PTY_MASTER_MAJOR
;
787 ptm_driver
->minor_start
= 0;
788 ptm_driver
->type
= TTY_DRIVER_TYPE_PTY
;
789 ptm_driver
->subtype
= PTY_TYPE_MASTER
;
790 ptm_driver
->init_termios
= tty_std_termios
;
791 ptm_driver
->init_termios
.c_iflag
= 0;
792 ptm_driver
->init_termios
.c_oflag
= 0;
793 ptm_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
794 ptm_driver
->init_termios
.c_lflag
= 0;
795 ptm_driver
->init_termios
.c_ispeed
= 38400;
796 ptm_driver
->init_termios
.c_ospeed
= 38400;
797 ptm_driver
->other
= pts_driver
;
798 tty_set_operations(ptm_driver
, &ptm_unix98_ops
);
800 pts_driver
->driver_name
= "pty_slave";
801 pts_driver
->name
= "pts";
802 pts_driver
->major
= UNIX98_PTY_SLAVE_MAJOR
;
803 pts_driver
->minor_start
= 0;
804 pts_driver
->type
= TTY_DRIVER_TYPE_PTY
;
805 pts_driver
->subtype
= PTY_TYPE_SLAVE
;
806 pts_driver
->init_termios
= tty_std_termios
;
807 pts_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
808 pts_driver
->init_termios
.c_ispeed
= 38400;
809 pts_driver
->init_termios
.c_ospeed
= 38400;
810 pts_driver
->other
= ptm_driver
;
811 tty_set_operations(pts_driver
, &pty_unix98_ops
);
813 if (tty_register_driver(ptm_driver
))
814 panic("Couldn't register Unix98 ptm driver");
815 if (tty_register_driver(pts_driver
))
816 panic("Couldn't register Unix98 pts driver");
818 /* Now create the /dev/ptmx special device */
819 tty_default_fops(&ptmx_fops
);
820 ptmx_fops
.open
= ptmx_open
;
822 cdev_init(&ptmx_cdev
, &ptmx_fops
);
823 if (cdev_add(&ptmx_cdev
, MKDEV(TTYAUX_MAJOR
, 2), 1) ||
824 register_chrdev_region(MKDEV(TTYAUX_MAJOR
, 2), 1, "/dev/ptmx") < 0)
825 panic("Couldn't register /dev/ptmx driver");
826 device_create(tty_class
, NULL
, MKDEV(TTYAUX_MAJOR
, 2), NULL
, "ptmx");
830 static inline void unix98_pty_init(void) { }
833 static int __init
pty_init(void)
839 module_init(pty_init
);