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
);