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>
10 #include <linux/errno.h>
11 #include <linux/interrupt.h>
12 #include <linux/tty.h>
13 #include <linux/tty_flip.h>
14 #include <linux/fcntl.h>
15 #include <linux/sched.h>
16 #include <linux/string.h>
17 #include <linux/major.h>
19 #include <linux/init.h>
20 #include <linux/device.h>
21 #include <linux/uaccess.h>
22 #include <linux/bitops.h>
23 #include <linux/devpts_fs.h>
24 #include <linux/slab.h>
25 #include <linux/mutex.h>
26 #include <linux/poll.h>
28 #undef TTY_DEBUG_HANGUP
29 #ifdef TTY_DEBUG_HANGUP
30 # define tty_debug_hangup(tty, f, args...) tty_debug(tty, f, ##args)
32 # define tty_debug_hangup(tty, f, args...) do {} while (0)
35 #ifdef CONFIG_UNIX98_PTYS
36 static struct tty_driver
*ptm_driver
;
37 static struct tty_driver
*pts_driver
;
38 static DEFINE_MUTEX(devpts_mutex
);
41 static void pty_close(struct tty_struct
*tty
, struct file
*filp
)
44 if (tty
->driver
->subtype
== PTY_TYPE_MASTER
)
45 WARN_ON(tty
->count
> 1);
47 if (test_bit(TTY_IO_ERROR
, &tty
->flags
))
52 set_bit(TTY_IO_ERROR
, &tty
->flags
);
53 wake_up_interruptible(&tty
->read_wait
);
54 wake_up_interruptible(&tty
->write_wait
);
55 spin_lock_irq(&tty
->ctrl_lock
);
57 spin_unlock_irq(&tty
->ctrl_lock
);
58 /* Review - krefs on tty_link ?? */
61 set_bit(TTY_OTHER_CLOSED
, &tty
->link
->flags
);
62 wake_up_interruptible(&tty
->link
->read_wait
);
63 wake_up_interruptible(&tty
->link
->write_wait
);
64 if (tty
->driver
->subtype
== PTY_TYPE_MASTER
) {
65 set_bit(TTY_OTHER_CLOSED
, &tty
->flags
);
66 #ifdef CONFIG_UNIX98_PTYS
67 if (tty
->driver
== ptm_driver
) {
68 mutex_lock(&devpts_mutex
);
69 if (tty
->link
->driver_data
)
70 devpts_pty_kill(tty
->link
->driver_data
);
71 mutex_unlock(&devpts_mutex
);
74 tty_vhangup(tty
->link
);
79 * The unthrottle routine is called by the line discipline to signal
80 * that it can receive more characters. For PTY's, the TTY_THROTTLED
81 * flag is always set, to force the line discipline to always call the
82 * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE
83 * characters in the queue. This is necessary since each time this
84 * happens, we need to wake up any sleeping processes that could be
85 * (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
86 * for the pty buffer to be drained.
88 static void pty_unthrottle(struct tty_struct
*tty
)
90 tty_wakeup(tty
->link
);
91 set_bit(TTY_THROTTLED
, &tty
->flags
);
95 * pty_write - write to a pty
96 * @tty: the tty we write from
97 * @buf: kernel buffer of data
98 * @count: bytes to write
100 * Our "hardware" write method. Data is coming from the ldisc which
101 * may be in a non sleeping state. We simply throw this at the other
102 * end of the link as if we were an IRQ handler receiving stuff for
103 * the other side of the pty/tty pair.
106 static int pty_write(struct tty_struct
*tty
, const unsigned char *buf
, int c
)
108 struct tty_struct
*to
= tty
->link
;
114 /* Stuff the data into the input queue of the other end */
115 c
= tty_insert_flip_string(to
->port
, buf
, c
);
118 tty_flip_buffer_push(to
->port
);
124 * pty_write_room - write space
125 * @tty: tty we are writing from
127 * Report how many bytes the ldisc can send into the queue for
131 static int pty_write_room(struct tty_struct
*tty
)
135 return tty_buffer_space_avail(tty
->link
->port
);
139 * pty_chars_in_buffer - characters currently in our tx queue
142 * Report how much we have in the transmit queue. As everything is
143 * instantly at the other end this is easy to implement.
146 static int pty_chars_in_buffer(struct tty_struct
*tty
)
151 /* Set the lock flag on a pty */
152 static int pty_set_lock(struct tty_struct
*tty
, int __user
*arg
)
155 if (get_user(val
, arg
))
158 set_bit(TTY_PTY_LOCK
, &tty
->flags
);
160 clear_bit(TTY_PTY_LOCK
, &tty
->flags
);
164 static int pty_get_lock(struct tty_struct
*tty
, int __user
*arg
)
166 int locked
= test_bit(TTY_PTY_LOCK
, &tty
->flags
);
167 return put_user(locked
, arg
);
170 /* Set the packet mode on a pty */
171 static int pty_set_pktmode(struct tty_struct
*tty
, int __user
*arg
)
175 if (get_user(pktmode
, arg
))
178 spin_lock_irq(&tty
->ctrl_lock
);
181 tty
->link
->ctrl_status
= 0;
187 spin_unlock_irq(&tty
->ctrl_lock
);
192 /* Get the packet mode of a pty */
193 static int pty_get_pktmode(struct tty_struct
*tty
, int __user
*arg
)
195 int pktmode
= tty
->packet
;
196 return put_user(pktmode
, arg
);
199 /* Send a signal to the slave */
200 static int pty_signal(struct tty_struct
*tty
, int sig
)
204 if (sig
!= SIGINT
&& sig
!= SIGQUIT
&& sig
!= SIGTSTP
)
208 pgrp
= tty_get_pgrp(tty
->link
);
210 kill_pgrp(pgrp
, sig
, 1);
216 static void pty_flush_buffer(struct tty_struct
*tty
)
218 struct tty_struct
*to
= tty
->link
;
219 struct tty_ldisc
*ld
;
224 ld
= tty_ldisc_ref(to
);
225 tty_buffer_flush(to
, ld
);
230 spin_lock_irq(&tty
->ctrl_lock
);
231 tty
->ctrl_status
|= TIOCPKT_FLUSHWRITE
;
232 wake_up_interruptible(&to
->read_wait
);
233 spin_unlock_irq(&tty
->ctrl_lock
);
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 /* See if packet mode change of state. */
263 if (tty
->link
&& tty
->link
->packet
) {
264 int extproc
= (old_termios
->c_lflag
& EXTPROC
) |
265 (tty
->termios
.c_lflag
& EXTPROC
);
266 int old_flow
= ((old_termios
->c_iflag
& IXON
) &&
267 (old_termios
->c_cc
[VSTOP
] == '\023') &&
268 (old_termios
->c_cc
[VSTART
] == '\021'));
269 int new_flow
= (I_IXON(tty
) &&
270 STOP_CHAR(tty
) == '\023' &&
271 START_CHAR(tty
) == '\021');
272 if ((old_flow
!= new_flow
) || extproc
) {
273 spin_lock_irq(&tty
->ctrl_lock
);
274 if (old_flow
!= new_flow
) {
275 tty
->ctrl_status
&= ~(TIOCPKT_DOSTOP
| TIOCPKT_NOSTOP
);
277 tty
->ctrl_status
|= TIOCPKT_DOSTOP
;
279 tty
->ctrl_status
|= TIOCPKT_NOSTOP
;
282 tty
->ctrl_status
|= TIOCPKT_IOCTL
;
283 spin_unlock_irq(&tty
->ctrl_lock
);
284 wake_up_interruptible(&tty
->link
->read_wait
);
288 tty
->termios
.c_cflag
&= ~(CSIZE
| PARENB
);
289 tty
->termios
.c_cflag
|= (CS8
| CREAD
);
293 * pty_do_resize - resize event
294 * @tty: tty being resized
295 * @ws: window size being set.
297 * Update the termios variables and send the necessary signals to
298 * peform a terminal resize correctly
301 static int pty_resize(struct tty_struct
*tty
, struct winsize
*ws
)
303 struct pid
*pgrp
, *rpgrp
;
304 struct tty_struct
*pty
= tty
->link
;
306 /* For a PTY we need to lock the tty side */
307 mutex_lock(&tty
->winsize_mutex
);
308 if (!memcmp(ws
, &tty
->winsize
, sizeof(*ws
)))
311 /* Signal the foreground process group of both ptys */
312 pgrp
= tty_get_pgrp(tty
);
313 rpgrp
= tty_get_pgrp(pty
);
316 kill_pgrp(pgrp
, SIGWINCH
, 1);
317 if (rpgrp
!= pgrp
&& rpgrp
)
318 kill_pgrp(rpgrp
, SIGWINCH
, 1);
324 pty
->winsize
= *ws
; /* Never used so will go away soon */
326 mutex_unlock(&tty
->winsize_mutex
);
331 * pty_start - start() handler
332 * pty_stop - stop() handler
333 * @tty: tty being flow-controlled
335 * Propagates the TIOCPKT status to the master pty.
337 * NB: only the master pty can be in packet mode so only the slave
338 * needs start()/stop() handlers
340 static void pty_start(struct tty_struct
*tty
)
344 if (tty
->link
&& tty
->link
->packet
) {
345 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
346 tty
->ctrl_status
&= ~TIOCPKT_STOP
;
347 tty
->ctrl_status
|= TIOCPKT_START
;
348 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
349 wake_up_interruptible_poll(&tty
->link
->read_wait
, POLLIN
);
353 static void pty_stop(struct tty_struct
*tty
)
357 if (tty
->link
&& tty
->link
->packet
) {
358 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
359 tty
->ctrl_status
&= ~TIOCPKT_START
;
360 tty
->ctrl_status
|= TIOCPKT_STOP
;
361 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
362 wake_up_interruptible_poll(&tty
->link
->read_wait
, POLLIN
);
367 * pty_common_install - set up the pty pair
368 * @driver: the pty driver
369 * @tty: the tty being instantiated
370 * @legacy: true if this is BSD style
372 * Perform the initial set up for the tty/pty pair. Called from the
373 * tty layer when the port is first opened.
375 * Locking: the caller must hold the tty_mutex
377 static int pty_common_install(struct tty_driver
*driver
, struct tty_struct
*tty
,
380 struct tty_struct
*o_tty
;
381 struct tty_port
*ports
[2];
382 int idx
= tty
->index
;
383 int retval
= -ENOMEM
;
385 /* Opening the slave first has always returned -EIO */
386 if (driver
->subtype
!= PTY_TYPE_MASTER
)
389 ports
[0] = kmalloc(sizeof **ports
, GFP_KERNEL
);
390 ports
[1] = kmalloc(sizeof **ports
, GFP_KERNEL
);
391 if (!ports
[0] || !ports
[1])
393 if (!try_module_get(driver
->other
->owner
)) {
394 /* This cannot in fact currently happen */
397 o_tty
= alloc_tty_struct(driver
->other
, idx
);
401 tty_set_lock_subclass(o_tty
);
402 lockdep_set_subclass(&o_tty
->termios_rwsem
, TTY_LOCK_SLAVE
);
405 /* We always use new tty termios data so we can do this
407 retval
= tty_init_termios(tty
);
411 retval
= tty_init_termios(o_tty
);
413 goto err_free_termios
;
415 driver
->other
->ttys
[idx
] = o_tty
;
416 driver
->ttys
[idx
] = tty
;
418 memset(&tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
419 tty
->termios
= driver
->init_termios
;
420 memset(&o_tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
421 o_tty
->termios
= driver
->other
->init_termios
;
425 * Everything allocated ... set up the o_tty structure.
427 tty_driver_kref_get(driver
->other
);
428 /* Establish the links in both directions */
431 tty_port_init(ports
[0]);
432 tty_port_init(ports
[1]);
433 tty_buffer_set_limit(ports
[0], 8192);
434 tty_buffer_set_limit(ports
[1], 8192);
435 o_tty
->port
= ports
[0];
436 tty
->port
= ports
[1];
437 o_tty
->port
->itty
= o_tty
;
439 tty_buffer_set_lock_subclass(o_tty
->port
);
441 tty_driver_kref_get(driver
);
447 tty_free_termios(tty
);
449 deinitialize_tty_struct(o_tty
);
450 free_tty_struct(o_tty
);
452 module_put(driver
->other
->owner
);
459 static void pty_cleanup(struct tty_struct
*tty
)
461 tty_port_put(tty
->port
);
464 /* Traditional BSD devices */
465 #ifdef CONFIG_LEGACY_PTYS
467 static int pty_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
469 return pty_common_install(driver
, tty
, true);
472 static void pty_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
474 struct tty_struct
*pair
= tty
->link
;
475 driver
->ttys
[tty
->index
] = NULL
;
477 pair
->driver
->ttys
[pair
->index
] = NULL
;
480 static int pty_bsd_ioctl(struct tty_struct
*tty
,
481 unsigned int cmd
, unsigned long arg
)
484 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
485 return pty_set_lock(tty
, (int __user
*) arg
);
486 case TIOCGPTLCK
: /* Get PT Lock status */
487 return pty_get_lock(tty
, (int __user
*)arg
);
488 case TIOCPKT
: /* Set PT packet mode */
489 return pty_set_pktmode(tty
, (int __user
*)arg
);
490 case TIOCGPKT
: /* Get PT packet mode */
491 return pty_get_pktmode(tty
, (int __user
*)arg
);
492 case TIOCSIG
: /* Send signal to other side of pty */
493 return pty_signal(tty
, (int) arg
);
494 case TIOCGPTN
: /* TTY returns ENOTTY, but glibc expects EINVAL here */
500 static int legacy_count
= CONFIG_LEGACY_PTY_COUNT
;
502 * not really modular, but the easiest way to keep compat with existing
503 * bootargs behaviour is to continue using module_param here.
505 module_param(legacy_count
, int, 0);
508 * The master side of a pty can do TIOCSPTLCK and thus
511 static const struct tty_operations master_pty_ops_bsd
= {
512 .install
= pty_install
,
516 .write_room
= pty_write_room
,
517 .flush_buffer
= pty_flush_buffer
,
518 .chars_in_buffer
= pty_chars_in_buffer
,
519 .unthrottle
= pty_unthrottle
,
520 .ioctl
= pty_bsd_ioctl
,
521 .cleanup
= pty_cleanup
,
522 .resize
= pty_resize
,
526 static const struct tty_operations slave_pty_ops_bsd
= {
527 .install
= pty_install
,
531 .write_room
= pty_write_room
,
532 .flush_buffer
= pty_flush_buffer
,
533 .chars_in_buffer
= pty_chars_in_buffer
,
534 .unthrottle
= pty_unthrottle
,
535 .set_termios
= pty_set_termios
,
536 .cleanup
= pty_cleanup
,
537 .resize
= pty_resize
,
543 static void __init
legacy_pty_init(void)
545 struct tty_driver
*pty_driver
, *pty_slave_driver
;
547 if (legacy_count
<= 0)
550 pty_driver
= tty_alloc_driver(legacy_count
,
551 TTY_DRIVER_RESET_TERMIOS
|
552 TTY_DRIVER_REAL_RAW
|
553 TTY_DRIVER_DYNAMIC_ALLOC
);
554 if (IS_ERR(pty_driver
))
555 panic("Couldn't allocate pty driver");
557 pty_slave_driver
= tty_alloc_driver(legacy_count
,
558 TTY_DRIVER_RESET_TERMIOS
|
559 TTY_DRIVER_REAL_RAW
|
560 TTY_DRIVER_DYNAMIC_ALLOC
);
561 if (IS_ERR(pty_slave_driver
))
562 panic("Couldn't allocate pty slave driver");
564 pty_driver
->driver_name
= "pty_master";
565 pty_driver
->name
= "pty";
566 pty_driver
->major
= PTY_MASTER_MAJOR
;
567 pty_driver
->minor_start
= 0;
568 pty_driver
->type
= TTY_DRIVER_TYPE_PTY
;
569 pty_driver
->subtype
= PTY_TYPE_MASTER
;
570 pty_driver
->init_termios
= tty_std_termios
;
571 pty_driver
->init_termios
.c_iflag
= 0;
572 pty_driver
->init_termios
.c_oflag
= 0;
573 pty_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
574 pty_driver
->init_termios
.c_lflag
= 0;
575 pty_driver
->init_termios
.c_ispeed
= 38400;
576 pty_driver
->init_termios
.c_ospeed
= 38400;
577 pty_driver
->other
= pty_slave_driver
;
578 tty_set_operations(pty_driver
, &master_pty_ops_bsd
);
580 pty_slave_driver
->driver_name
= "pty_slave";
581 pty_slave_driver
->name
= "ttyp";
582 pty_slave_driver
->major
= PTY_SLAVE_MAJOR
;
583 pty_slave_driver
->minor_start
= 0;
584 pty_slave_driver
->type
= TTY_DRIVER_TYPE_PTY
;
585 pty_slave_driver
->subtype
= PTY_TYPE_SLAVE
;
586 pty_slave_driver
->init_termios
= tty_std_termios
;
587 pty_slave_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
588 pty_slave_driver
->init_termios
.c_ispeed
= 38400;
589 pty_slave_driver
->init_termios
.c_ospeed
= 38400;
590 pty_slave_driver
->other
= pty_driver
;
591 tty_set_operations(pty_slave_driver
, &slave_pty_ops_bsd
);
593 if (tty_register_driver(pty_driver
))
594 panic("Couldn't register pty driver");
595 if (tty_register_driver(pty_slave_driver
))
596 panic("Couldn't register pty slave driver");
599 static inline void legacy_pty_init(void) { }
603 #ifdef CONFIG_UNIX98_PTYS
605 static struct cdev ptmx_cdev
;
607 static int pty_unix98_ioctl(struct tty_struct
*tty
,
608 unsigned int cmd
, unsigned long arg
)
611 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
612 return pty_set_lock(tty
, (int __user
*)arg
);
613 case TIOCGPTLCK
: /* Get PT Lock status */
614 return pty_get_lock(tty
, (int __user
*)arg
);
615 case TIOCPKT
: /* Set PT packet mode */
616 return pty_set_pktmode(tty
, (int __user
*)arg
);
617 case TIOCGPKT
: /* Get PT packet mode */
618 return pty_get_pktmode(tty
, (int __user
*)arg
);
619 case TIOCGPTN
: /* Get PT Number */
620 return put_user(tty
->index
, (unsigned int __user
*)arg
);
621 case TIOCSIG
: /* Send signal to other side of pty */
622 return pty_signal(tty
, (int) arg
);
629 * ptm_unix98_lookup - find a pty master
630 * @driver: ptm driver
633 * Look up a pty master device. Called under the tty_mutex for now.
634 * This provides our locking.
637 static struct tty_struct
*ptm_unix98_lookup(struct tty_driver
*driver
,
638 struct inode
*ptm_inode
, int idx
)
640 /* Master must be open via /dev/ptmx */
641 return ERR_PTR(-EIO
);
645 * pts_unix98_lookup - find a pty slave
646 * @driver: pts driver
649 * Look up a pty master device. Called under the tty_mutex for now.
650 * This provides our locking for the tty pointer.
653 static struct tty_struct
*pts_unix98_lookup(struct tty_driver
*driver
,
654 struct inode
*pts_inode
, int idx
)
656 struct tty_struct
*tty
;
658 mutex_lock(&devpts_mutex
);
659 tty
= devpts_get_priv(pts_inode
);
660 mutex_unlock(&devpts_mutex
);
661 /* Master must be open before slave */
663 return ERR_PTR(-EIO
);
667 /* We have no need to install and remove our tty objects as devpts does all
670 static int pty_unix98_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
672 return pty_common_install(driver
, tty
, false);
675 static void pty_unix98_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
679 /* this is called once with whichever end is closed last */
680 static void pty_unix98_shutdown(struct tty_struct
*tty
)
682 struct pts_fs_info
*fsi
;
684 if (tty
->driver
->subtype
== PTY_TYPE_MASTER
)
685 fsi
= tty
->driver_data
;
687 fsi
= tty
->link
->driver_data
;
690 devpts_kill_index(fsi
, tty
->index
);
695 static const struct tty_operations ptm_unix98_ops
= {
696 .lookup
= ptm_unix98_lookup
,
697 .install
= pty_unix98_install
,
698 .remove
= pty_unix98_remove
,
702 .write_room
= pty_write_room
,
703 .flush_buffer
= pty_flush_buffer
,
704 .chars_in_buffer
= pty_chars_in_buffer
,
705 .unthrottle
= pty_unthrottle
,
706 .ioctl
= pty_unix98_ioctl
,
707 .resize
= pty_resize
,
708 .shutdown
= pty_unix98_shutdown
,
709 .cleanup
= pty_cleanup
712 static const struct tty_operations pty_unix98_ops
= {
713 .lookup
= pts_unix98_lookup
,
714 .install
= pty_unix98_install
,
715 .remove
= pty_unix98_remove
,
719 .write_room
= pty_write_room
,
720 .flush_buffer
= pty_flush_buffer
,
721 .chars_in_buffer
= pty_chars_in_buffer
,
722 .unthrottle
= pty_unthrottle
,
723 .set_termios
= pty_set_termios
,
726 .shutdown
= pty_unix98_shutdown
,
727 .cleanup
= pty_cleanup
,
731 * ptmx_open - open a unix 98 pty master
732 * @inode: inode of device file
733 * @filp: file pointer to tty
735 * Allocate a unix98 pty master device from the ptmx driver.
737 * Locking: tty_mutex protects the init_dev work. tty->count should
739 * allocated_ptys_lock handles the list of free pty numbers
742 static int ptmx_open(struct inode
*inode
, struct file
*filp
)
744 struct pts_fs_info
*fsi
;
745 struct tty_struct
*tty
;
746 struct inode
*slave_inode
;
750 nonseekable_open(inode
, filp
);
752 /* We refuse fsnotify events on ptmx, since it's a shared resource */
753 filp
->f_mode
|= FMODE_NONOTIFY
;
755 retval
= tty_alloc_file(filp
);
759 fsi
= devpts_get_ref(inode
, filp
);
764 /* find a device that is not in use. */
765 mutex_lock(&devpts_mutex
);
766 index
= devpts_new_index(fsi
);
767 mutex_unlock(&devpts_mutex
);
774 mutex_lock(&tty_mutex
);
775 tty
= tty_init_dev(ptm_driver
, index
);
776 /* The tty returned here is locked so we can safely
778 mutex_unlock(&tty_mutex
);
780 retval
= PTR_ERR(tty
);
785 * From here on out, the tty is "live", and the index and
786 * fsi will be killed/put by the tty_release()
788 set_bit(TTY_PTY_LOCK
, &tty
->flags
); /* LOCK THE SLAVE */
789 tty
->driver_data
= fsi
;
791 tty_add_file(tty
, filp
);
793 slave_inode
= devpts_pty_new(fsi
,
794 MKDEV(UNIX98_PTY_SLAVE_MAJOR
, index
), index
,
796 if (IS_ERR(slave_inode
)) {
797 retval
= PTR_ERR(slave_inode
);
800 tty
->link
->driver_data
= slave_inode
;
802 retval
= ptm_driver
->ops
->open(tty
, filp
);
806 tty_debug_hangup(tty
, "(tty count=%d)\n", tty
->count
);
812 // This will also put-ref the fsi
813 tty_release(inode
, filp
);
816 devpts_kill_index(fsi
, index
);
824 static struct file_operations ptmx_fops
;
826 static void __init
unix98_pty_init(void)
828 ptm_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
829 TTY_DRIVER_RESET_TERMIOS
|
830 TTY_DRIVER_REAL_RAW
|
831 TTY_DRIVER_DYNAMIC_DEV
|
832 TTY_DRIVER_DEVPTS_MEM
|
833 TTY_DRIVER_DYNAMIC_ALLOC
);
834 if (IS_ERR(ptm_driver
))
835 panic("Couldn't allocate Unix98 ptm driver");
836 pts_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
837 TTY_DRIVER_RESET_TERMIOS
|
838 TTY_DRIVER_REAL_RAW
|
839 TTY_DRIVER_DYNAMIC_DEV
|
840 TTY_DRIVER_DEVPTS_MEM
|
841 TTY_DRIVER_DYNAMIC_ALLOC
);
842 if (IS_ERR(pts_driver
))
843 panic("Couldn't allocate Unix98 pts driver");
845 ptm_driver
->driver_name
= "pty_master";
846 ptm_driver
->name
= "ptm";
847 ptm_driver
->major
= UNIX98_PTY_MASTER_MAJOR
;
848 ptm_driver
->minor_start
= 0;
849 ptm_driver
->type
= TTY_DRIVER_TYPE_PTY
;
850 ptm_driver
->subtype
= PTY_TYPE_MASTER
;
851 ptm_driver
->init_termios
= tty_std_termios
;
852 ptm_driver
->init_termios
.c_iflag
= 0;
853 ptm_driver
->init_termios
.c_oflag
= 0;
854 ptm_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
855 ptm_driver
->init_termios
.c_lflag
= 0;
856 ptm_driver
->init_termios
.c_ispeed
= 38400;
857 ptm_driver
->init_termios
.c_ospeed
= 38400;
858 ptm_driver
->other
= pts_driver
;
859 tty_set_operations(ptm_driver
, &ptm_unix98_ops
);
861 pts_driver
->driver_name
= "pty_slave";
862 pts_driver
->name
= "pts";
863 pts_driver
->major
= UNIX98_PTY_SLAVE_MAJOR
;
864 pts_driver
->minor_start
= 0;
865 pts_driver
->type
= TTY_DRIVER_TYPE_PTY
;
866 pts_driver
->subtype
= PTY_TYPE_SLAVE
;
867 pts_driver
->init_termios
= tty_std_termios
;
868 pts_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
869 pts_driver
->init_termios
.c_ispeed
= 38400;
870 pts_driver
->init_termios
.c_ospeed
= 38400;
871 pts_driver
->other
= ptm_driver
;
872 tty_set_operations(pts_driver
, &pty_unix98_ops
);
874 if (tty_register_driver(ptm_driver
))
875 panic("Couldn't register Unix98 ptm driver");
876 if (tty_register_driver(pts_driver
))
877 panic("Couldn't register Unix98 pts driver");
879 /* Now create the /dev/ptmx special device */
880 tty_default_fops(&ptmx_fops
);
881 ptmx_fops
.open
= ptmx_open
;
883 cdev_init(&ptmx_cdev
, &ptmx_fops
);
884 if (cdev_add(&ptmx_cdev
, MKDEV(TTYAUX_MAJOR
, 2), 1) ||
885 register_chrdev_region(MKDEV(TTYAUX_MAJOR
, 2), 1, "/dev/ptmx") < 0)
886 panic("Couldn't register /dev/ptmx driver");
887 device_create(tty_class
, NULL
, MKDEV(TTYAUX_MAJOR
, 2), NULL
, "ptmx");
891 static inline void unix98_pty_init(void) { }
894 static int __init
pty_init(void)
900 device_initcall(pty_init
);