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
;
223 tty_buffer_flush(to
, NULL
);
225 spin_lock_irq(&tty
->ctrl_lock
);
226 tty
->ctrl_status
|= TIOCPKT_FLUSHWRITE
;
227 wake_up_interruptible(&to
->read_wait
);
228 spin_unlock_irq(&tty
->ctrl_lock
);
232 static int pty_open(struct tty_struct
*tty
, struct file
*filp
)
234 if (!tty
|| !tty
->link
)
237 if (test_bit(TTY_OTHER_CLOSED
, &tty
->flags
))
239 if (test_bit(TTY_PTY_LOCK
, &tty
->link
->flags
))
241 if (tty
->driver
->subtype
== PTY_TYPE_SLAVE
&& tty
->link
->count
!= 1)
244 clear_bit(TTY_IO_ERROR
, &tty
->flags
);
245 clear_bit(TTY_OTHER_CLOSED
, &tty
->link
->flags
);
246 set_bit(TTY_THROTTLED
, &tty
->flags
);
250 set_bit(TTY_IO_ERROR
, &tty
->flags
);
254 static void pty_set_termios(struct tty_struct
*tty
,
255 struct ktermios
*old_termios
)
257 /* See if packet mode change of state. */
258 if (tty
->link
&& tty
->link
->packet
) {
259 int extproc
= (old_termios
->c_lflag
& EXTPROC
) |
260 (tty
->termios
.c_lflag
& EXTPROC
);
261 int old_flow
= ((old_termios
->c_iflag
& IXON
) &&
262 (old_termios
->c_cc
[VSTOP
] == '\023') &&
263 (old_termios
->c_cc
[VSTART
] == '\021'));
264 int new_flow
= (I_IXON(tty
) &&
265 STOP_CHAR(tty
) == '\023' &&
266 START_CHAR(tty
) == '\021');
267 if ((old_flow
!= new_flow
) || extproc
) {
268 spin_lock_irq(&tty
->ctrl_lock
);
269 if (old_flow
!= new_flow
) {
270 tty
->ctrl_status
&= ~(TIOCPKT_DOSTOP
| TIOCPKT_NOSTOP
);
272 tty
->ctrl_status
|= TIOCPKT_DOSTOP
;
274 tty
->ctrl_status
|= TIOCPKT_NOSTOP
;
277 tty
->ctrl_status
|= TIOCPKT_IOCTL
;
278 spin_unlock_irq(&tty
->ctrl_lock
);
279 wake_up_interruptible(&tty
->link
->read_wait
);
283 tty
->termios
.c_cflag
&= ~(CSIZE
| PARENB
);
284 tty
->termios
.c_cflag
|= (CS8
| CREAD
);
288 * pty_do_resize - resize event
289 * @tty: tty being resized
290 * @ws: window size being set.
292 * Update the termios variables and send the necessary signals to
293 * peform a terminal resize correctly
296 static int pty_resize(struct tty_struct
*tty
, struct winsize
*ws
)
298 struct pid
*pgrp
, *rpgrp
;
299 struct tty_struct
*pty
= tty
->link
;
301 /* For a PTY we need to lock the tty side */
302 mutex_lock(&tty
->winsize_mutex
);
303 if (!memcmp(ws
, &tty
->winsize
, sizeof(*ws
)))
306 /* Signal the foreground process group of both ptys */
307 pgrp
= tty_get_pgrp(tty
);
308 rpgrp
= tty_get_pgrp(pty
);
311 kill_pgrp(pgrp
, SIGWINCH
, 1);
312 if (rpgrp
!= pgrp
&& rpgrp
)
313 kill_pgrp(rpgrp
, SIGWINCH
, 1);
319 pty
->winsize
= *ws
; /* Never used so will go away soon */
321 mutex_unlock(&tty
->winsize_mutex
);
326 * pty_start - start() handler
327 * pty_stop - stop() handler
328 * @tty: tty being flow-controlled
330 * Propagates the TIOCPKT status to the master pty.
332 * NB: only the master pty can be in packet mode so only the slave
333 * needs start()/stop() handlers
335 static void pty_start(struct tty_struct
*tty
)
339 if (tty
->link
&& tty
->link
->packet
) {
340 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
341 tty
->ctrl_status
&= ~TIOCPKT_STOP
;
342 tty
->ctrl_status
|= TIOCPKT_START
;
343 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
344 wake_up_interruptible_poll(&tty
->link
->read_wait
, POLLIN
);
348 static void pty_stop(struct tty_struct
*tty
)
352 if (tty
->link
&& tty
->link
->packet
) {
353 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
354 tty
->ctrl_status
&= ~TIOCPKT_START
;
355 tty
->ctrl_status
|= TIOCPKT_STOP
;
356 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
357 wake_up_interruptible_poll(&tty
->link
->read_wait
, POLLIN
);
362 * pty_common_install - set up the pty pair
363 * @driver: the pty driver
364 * @tty: the tty being instantiated
365 * @legacy: true if this is BSD style
367 * Perform the initial set up for the tty/pty pair. Called from the
368 * tty layer when the port is first opened.
370 * Locking: the caller must hold the tty_mutex
372 static int pty_common_install(struct tty_driver
*driver
, struct tty_struct
*tty
,
375 struct tty_struct
*o_tty
;
376 struct tty_port
*ports
[2];
377 int idx
= tty
->index
;
378 int retval
= -ENOMEM
;
380 /* Opening the slave first has always returned -EIO */
381 if (driver
->subtype
!= PTY_TYPE_MASTER
)
384 ports
[0] = kmalloc(sizeof **ports
, GFP_KERNEL
);
385 ports
[1] = kmalloc(sizeof **ports
, GFP_KERNEL
);
386 if (!ports
[0] || !ports
[1])
388 if (!try_module_get(driver
->other
->owner
)) {
389 /* This cannot in fact currently happen */
392 o_tty
= alloc_tty_struct(driver
->other
, idx
);
396 tty_set_lock_subclass(o_tty
);
397 lockdep_set_subclass(&o_tty
->termios_rwsem
, TTY_LOCK_SLAVE
);
400 /* We always use new tty termios data so we can do this
402 retval
= tty_init_termios(tty
);
406 retval
= tty_init_termios(o_tty
);
408 goto err_free_termios
;
410 driver
->other
->ttys
[idx
] = o_tty
;
411 driver
->ttys
[idx
] = tty
;
413 memset(&tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
414 tty
->termios
= driver
->init_termios
;
415 memset(&o_tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
416 o_tty
->termios
= driver
->other
->init_termios
;
420 * Everything allocated ... set up the o_tty structure.
422 tty_driver_kref_get(driver
->other
);
423 /* Establish the links in both directions */
426 tty_port_init(ports
[0]);
427 tty_port_init(ports
[1]);
428 tty_buffer_set_limit(ports
[0], 8192);
429 tty_buffer_set_limit(ports
[1], 8192);
430 o_tty
->port
= ports
[0];
431 tty
->port
= ports
[1];
432 o_tty
->port
->itty
= o_tty
;
434 tty_buffer_set_lock_subclass(o_tty
->port
);
436 tty_driver_kref_get(driver
);
442 tty_free_termios(tty
);
444 deinitialize_tty_struct(o_tty
);
445 free_tty_struct(o_tty
);
447 module_put(driver
->other
->owner
);
454 static void pty_cleanup(struct tty_struct
*tty
)
456 tty_port_put(tty
->port
);
459 /* Traditional BSD devices */
460 #ifdef CONFIG_LEGACY_PTYS
462 static int pty_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
464 return pty_common_install(driver
, tty
, true);
467 static void pty_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
469 struct tty_struct
*pair
= tty
->link
;
470 driver
->ttys
[tty
->index
] = NULL
;
472 pair
->driver
->ttys
[pair
->index
] = NULL
;
475 static int pty_bsd_ioctl(struct tty_struct
*tty
,
476 unsigned int cmd
, unsigned long arg
)
479 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
480 return pty_set_lock(tty
, (int __user
*) arg
);
481 case TIOCGPTLCK
: /* Get PT Lock status */
482 return pty_get_lock(tty
, (int __user
*)arg
);
483 case TIOCPKT
: /* Set PT packet mode */
484 return pty_set_pktmode(tty
, (int __user
*)arg
);
485 case TIOCGPKT
: /* Get PT packet mode */
486 return pty_get_pktmode(tty
, (int __user
*)arg
);
487 case TIOCSIG
: /* Send signal to other side of pty */
488 return pty_signal(tty
, (int) arg
);
489 case TIOCGPTN
: /* TTY returns ENOTTY, but glibc expects EINVAL here */
495 static int legacy_count
= CONFIG_LEGACY_PTY_COUNT
;
497 * not really modular, but the easiest way to keep compat with existing
498 * bootargs behaviour is to continue using module_param here.
500 module_param(legacy_count
, int, 0);
503 * The master side of a pty can do TIOCSPTLCK and thus
506 static const struct tty_operations master_pty_ops_bsd
= {
507 .install
= pty_install
,
511 .write_room
= pty_write_room
,
512 .flush_buffer
= pty_flush_buffer
,
513 .chars_in_buffer
= pty_chars_in_buffer
,
514 .unthrottle
= pty_unthrottle
,
515 .ioctl
= pty_bsd_ioctl
,
516 .cleanup
= pty_cleanup
,
517 .resize
= pty_resize
,
521 static const struct tty_operations slave_pty_ops_bsd
= {
522 .install
= pty_install
,
526 .write_room
= pty_write_room
,
527 .flush_buffer
= pty_flush_buffer
,
528 .chars_in_buffer
= pty_chars_in_buffer
,
529 .unthrottle
= pty_unthrottle
,
530 .set_termios
= pty_set_termios
,
531 .cleanup
= pty_cleanup
,
532 .resize
= pty_resize
,
538 static void __init
legacy_pty_init(void)
540 struct tty_driver
*pty_driver
, *pty_slave_driver
;
542 if (legacy_count
<= 0)
545 pty_driver
= tty_alloc_driver(legacy_count
,
546 TTY_DRIVER_RESET_TERMIOS
|
547 TTY_DRIVER_REAL_RAW
|
548 TTY_DRIVER_DYNAMIC_ALLOC
);
549 if (IS_ERR(pty_driver
))
550 panic("Couldn't allocate pty driver");
552 pty_slave_driver
= tty_alloc_driver(legacy_count
,
553 TTY_DRIVER_RESET_TERMIOS
|
554 TTY_DRIVER_REAL_RAW
|
555 TTY_DRIVER_DYNAMIC_ALLOC
);
556 if (IS_ERR(pty_slave_driver
))
557 panic("Couldn't allocate pty slave driver");
559 pty_driver
->driver_name
= "pty_master";
560 pty_driver
->name
= "pty";
561 pty_driver
->major
= PTY_MASTER_MAJOR
;
562 pty_driver
->minor_start
= 0;
563 pty_driver
->type
= TTY_DRIVER_TYPE_PTY
;
564 pty_driver
->subtype
= PTY_TYPE_MASTER
;
565 pty_driver
->init_termios
= tty_std_termios
;
566 pty_driver
->init_termios
.c_iflag
= 0;
567 pty_driver
->init_termios
.c_oflag
= 0;
568 pty_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
569 pty_driver
->init_termios
.c_lflag
= 0;
570 pty_driver
->init_termios
.c_ispeed
= 38400;
571 pty_driver
->init_termios
.c_ospeed
= 38400;
572 pty_driver
->other
= pty_slave_driver
;
573 tty_set_operations(pty_driver
, &master_pty_ops_bsd
);
575 pty_slave_driver
->driver_name
= "pty_slave";
576 pty_slave_driver
->name
= "ttyp";
577 pty_slave_driver
->major
= PTY_SLAVE_MAJOR
;
578 pty_slave_driver
->minor_start
= 0;
579 pty_slave_driver
->type
= TTY_DRIVER_TYPE_PTY
;
580 pty_slave_driver
->subtype
= PTY_TYPE_SLAVE
;
581 pty_slave_driver
->init_termios
= tty_std_termios
;
582 pty_slave_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
583 pty_slave_driver
->init_termios
.c_ispeed
= 38400;
584 pty_slave_driver
->init_termios
.c_ospeed
= 38400;
585 pty_slave_driver
->other
= pty_driver
;
586 tty_set_operations(pty_slave_driver
, &slave_pty_ops_bsd
);
588 if (tty_register_driver(pty_driver
))
589 panic("Couldn't register pty driver");
590 if (tty_register_driver(pty_slave_driver
))
591 panic("Couldn't register pty slave driver");
594 static inline void legacy_pty_init(void) { }
598 #ifdef CONFIG_UNIX98_PTYS
600 static struct cdev ptmx_cdev
;
602 static int pty_unix98_ioctl(struct tty_struct
*tty
,
603 unsigned int cmd
, unsigned long arg
)
606 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
607 return pty_set_lock(tty
, (int __user
*)arg
);
608 case TIOCGPTLCK
: /* Get PT Lock status */
609 return pty_get_lock(tty
, (int __user
*)arg
);
610 case TIOCPKT
: /* Set PT packet mode */
611 return pty_set_pktmode(tty
, (int __user
*)arg
);
612 case TIOCGPKT
: /* Get PT packet mode */
613 return pty_get_pktmode(tty
, (int __user
*)arg
);
614 case TIOCGPTN
: /* Get PT Number */
615 return put_user(tty
->index
, (unsigned int __user
*)arg
);
616 case TIOCSIG
: /* Send signal to other side of pty */
617 return pty_signal(tty
, (int) arg
);
624 * ptm_unix98_lookup - find a pty master
625 * @driver: ptm driver
628 * Look up a pty master device. Called under the tty_mutex for now.
629 * This provides our locking.
632 static struct tty_struct
*ptm_unix98_lookup(struct tty_driver
*driver
,
633 struct inode
*ptm_inode
, int idx
)
635 /* Master must be open via /dev/ptmx */
636 return ERR_PTR(-EIO
);
640 * pts_unix98_lookup - find a pty slave
641 * @driver: pts driver
644 * Look up a pty master device. Called under the tty_mutex for now.
645 * This provides our locking for the tty pointer.
648 static struct tty_struct
*pts_unix98_lookup(struct tty_driver
*driver
,
649 struct inode
*pts_inode
, int idx
)
651 struct tty_struct
*tty
;
653 mutex_lock(&devpts_mutex
);
654 tty
= devpts_get_priv(pts_inode
);
655 mutex_unlock(&devpts_mutex
);
656 /* Master must be open before slave */
658 return ERR_PTR(-EIO
);
662 /* We have no need to install and remove our tty objects as devpts does all
665 static int pty_unix98_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
667 return pty_common_install(driver
, tty
, false);
670 static void pty_unix98_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
674 /* this is called once with whichever end is closed last */
675 static void pty_unix98_shutdown(struct tty_struct
*tty
)
677 struct pts_fs_info
*fsi
;
679 if (tty
->driver
->subtype
== PTY_TYPE_MASTER
)
680 fsi
= tty
->driver_data
;
682 fsi
= tty
->link
->driver_data
;
685 devpts_kill_index(fsi
, tty
->index
);
690 static const struct tty_operations ptm_unix98_ops
= {
691 .lookup
= ptm_unix98_lookup
,
692 .install
= pty_unix98_install
,
693 .remove
= pty_unix98_remove
,
697 .write_room
= pty_write_room
,
698 .flush_buffer
= pty_flush_buffer
,
699 .chars_in_buffer
= pty_chars_in_buffer
,
700 .unthrottle
= pty_unthrottle
,
701 .ioctl
= pty_unix98_ioctl
,
702 .resize
= pty_resize
,
703 .shutdown
= pty_unix98_shutdown
,
704 .cleanup
= pty_cleanup
707 static const struct tty_operations pty_unix98_ops
= {
708 .lookup
= pts_unix98_lookup
,
709 .install
= pty_unix98_install
,
710 .remove
= pty_unix98_remove
,
714 .write_room
= pty_write_room
,
715 .flush_buffer
= pty_flush_buffer
,
716 .chars_in_buffer
= pty_chars_in_buffer
,
717 .unthrottle
= pty_unthrottle
,
718 .set_termios
= pty_set_termios
,
721 .shutdown
= pty_unix98_shutdown
,
722 .cleanup
= pty_cleanup
,
726 * ptmx_open - open a unix 98 pty master
727 * @inode: inode of device file
728 * @filp: file pointer to tty
730 * Allocate a unix98 pty master device from the ptmx driver.
732 * Locking: tty_mutex protects the init_dev work. tty->count should
734 * allocated_ptys_lock handles the list of free pty numbers
737 static int ptmx_open(struct inode
*inode
, struct file
*filp
)
739 struct pts_fs_info
*fsi
;
740 struct tty_struct
*tty
;
741 struct inode
*slave_inode
;
745 nonseekable_open(inode
, filp
);
747 /* We refuse fsnotify events on ptmx, since it's a shared resource */
748 filp
->f_mode
|= FMODE_NONOTIFY
;
750 retval
= tty_alloc_file(filp
);
754 fsi
= devpts_get_ref(inode
, filp
);
759 /* find a device that is not in use. */
760 mutex_lock(&devpts_mutex
);
761 index
= devpts_new_index(fsi
);
762 mutex_unlock(&devpts_mutex
);
769 mutex_lock(&tty_mutex
);
770 tty
= tty_init_dev(ptm_driver
, index
);
771 /* The tty returned here is locked so we can safely
773 mutex_unlock(&tty_mutex
);
775 retval
= PTR_ERR(tty
);
780 * From here on out, the tty is "live", and the index and
781 * fsi will be killed/put by the tty_release()
783 set_bit(TTY_PTY_LOCK
, &tty
->flags
); /* LOCK THE SLAVE */
784 tty
->driver_data
= fsi
;
786 tty_add_file(tty
, filp
);
788 slave_inode
= devpts_pty_new(fsi
,
789 MKDEV(UNIX98_PTY_SLAVE_MAJOR
, index
), index
,
791 if (IS_ERR(slave_inode
)) {
792 retval
= PTR_ERR(slave_inode
);
795 tty
->link
->driver_data
= slave_inode
;
797 retval
= ptm_driver
->ops
->open(tty
, filp
);
801 tty_debug_hangup(tty
, "(tty count=%d)\n", tty
->count
);
807 // This will also put-ref the fsi
808 tty_release(inode
, filp
);
811 devpts_kill_index(fsi
, index
);
819 static struct file_operations ptmx_fops
;
821 static void __init
unix98_pty_init(void)
823 ptm_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
824 TTY_DRIVER_RESET_TERMIOS
|
825 TTY_DRIVER_REAL_RAW
|
826 TTY_DRIVER_DYNAMIC_DEV
|
827 TTY_DRIVER_DEVPTS_MEM
|
828 TTY_DRIVER_DYNAMIC_ALLOC
);
829 if (IS_ERR(ptm_driver
))
830 panic("Couldn't allocate Unix98 ptm driver");
831 pts_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
832 TTY_DRIVER_RESET_TERMIOS
|
833 TTY_DRIVER_REAL_RAW
|
834 TTY_DRIVER_DYNAMIC_DEV
|
835 TTY_DRIVER_DEVPTS_MEM
|
836 TTY_DRIVER_DYNAMIC_ALLOC
);
837 if (IS_ERR(pts_driver
))
838 panic("Couldn't allocate Unix98 pts driver");
840 ptm_driver
->driver_name
= "pty_master";
841 ptm_driver
->name
= "ptm";
842 ptm_driver
->major
= UNIX98_PTY_MASTER_MAJOR
;
843 ptm_driver
->minor_start
= 0;
844 ptm_driver
->type
= TTY_DRIVER_TYPE_PTY
;
845 ptm_driver
->subtype
= PTY_TYPE_MASTER
;
846 ptm_driver
->init_termios
= tty_std_termios
;
847 ptm_driver
->init_termios
.c_iflag
= 0;
848 ptm_driver
->init_termios
.c_oflag
= 0;
849 ptm_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
850 ptm_driver
->init_termios
.c_lflag
= 0;
851 ptm_driver
->init_termios
.c_ispeed
= 38400;
852 ptm_driver
->init_termios
.c_ospeed
= 38400;
853 ptm_driver
->other
= pts_driver
;
854 tty_set_operations(ptm_driver
, &ptm_unix98_ops
);
856 pts_driver
->driver_name
= "pty_slave";
857 pts_driver
->name
= "pts";
858 pts_driver
->major
= UNIX98_PTY_SLAVE_MAJOR
;
859 pts_driver
->minor_start
= 0;
860 pts_driver
->type
= TTY_DRIVER_TYPE_PTY
;
861 pts_driver
->subtype
= PTY_TYPE_SLAVE
;
862 pts_driver
->init_termios
= tty_std_termios
;
863 pts_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
864 pts_driver
->init_termios
.c_ispeed
= 38400;
865 pts_driver
->init_termios
.c_ospeed
= 38400;
866 pts_driver
->other
= ptm_driver
;
867 tty_set_operations(pts_driver
, &pty_unix98_ops
);
869 if (tty_register_driver(ptm_driver
))
870 panic("Couldn't register Unix98 ptm driver");
871 if (tty_register_driver(pts_driver
))
872 panic("Couldn't register Unix98 pts driver");
874 /* Now create the /dev/ptmx special device */
875 tty_default_fops(&ptmx_fops
);
876 ptmx_fops
.open
= ptmx_open
;
878 cdev_init(&ptmx_cdev
, &ptmx_fops
);
879 if (cdev_add(&ptmx_cdev
, MKDEV(TTYAUX_MAJOR
, 2), 1) ||
880 register_chrdev_region(MKDEV(TTYAUX_MAJOR
, 2), 1, "/dev/ptmx") < 0)
881 panic("Couldn't register /dev/ptmx driver");
882 device_create(tty_class
, NULL
, MKDEV(TTYAUX_MAJOR
, 2), NULL
, "ptmx");
886 static inline void unix98_pty_init(void) { }
889 static int __init
pty_init(void)
895 device_initcall(pty_init
);