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
);
50 spin_lock_irq(&tty
->ctrl_lock
);
52 spin_unlock_irq(&tty
->ctrl_lock
);
53 /* Review - krefs on tty_link ?? */
56 tty_flush_to_ldisc(tty
->link
);
57 set_bit(TTY_OTHER_CLOSED
, &tty
->link
->flags
);
58 wake_up_interruptible(&tty
->link
->read_wait
);
59 wake_up_interruptible(&tty
->link
->write_wait
);
60 if (tty
->driver
->subtype
== PTY_TYPE_MASTER
) {
61 set_bit(TTY_OTHER_CLOSED
, &tty
->flags
);
62 #ifdef CONFIG_UNIX98_PTYS
63 if (tty
->driver
== ptm_driver
) {
64 mutex_lock(&devpts_mutex
);
65 if (tty
->link
->driver_data
)
66 devpts_pty_kill(tty
->link
->driver_data
);
67 mutex_unlock(&devpts_mutex
);
70 tty_vhangup(tty
->link
);
75 * The unthrottle routine is called by the line discipline to signal
76 * that it can receive more characters. For PTY's, the TTY_THROTTLED
77 * flag is always set, to force the line discipline to always call the
78 * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE
79 * characters in the queue. This is necessary since each time this
80 * happens, we need to wake up any sleeping processes that could be
81 * (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
82 * for the pty buffer to be drained.
84 static void pty_unthrottle(struct tty_struct
*tty
)
86 tty_wakeup(tty
->link
);
87 set_bit(TTY_THROTTLED
, &tty
->flags
);
91 * pty_write - write to a pty
92 * @tty: the tty we write from
93 * @buf: kernel buffer of data
94 * @count: bytes to write
96 * Our "hardware" write method. Data is coming from the ldisc which
97 * may be in a non sleeping state. We simply throw this at the other
98 * end of the link as if we were an IRQ handler receiving stuff for
99 * the other side of the pty/tty pair.
102 static int pty_write(struct tty_struct
*tty
, const unsigned char *buf
, int c
)
104 struct tty_struct
*to
= tty
->link
;
110 /* Stuff the data into the input queue of the other end */
111 c
= tty_insert_flip_string(to
->port
, buf
, c
);
114 tty_flip_buffer_push(to
->port
);
120 * pty_write_room - write space
121 * @tty: tty we are writing from
123 * Report how many bytes the ldisc can send into the queue for
127 static int pty_write_room(struct tty_struct
*tty
)
131 return tty_buffer_space_avail(tty
->link
->port
);
135 * pty_chars_in_buffer - characters currently in our tx queue
138 * Report how much we have in the transmit queue. As everything is
139 * instantly at the other end this is easy to implement.
142 static int pty_chars_in_buffer(struct tty_struct
*tty
)
147 /* Set the lock flag on a pty */
148 static int pty_set_lock(struct tty_struct
*tty
, int __user
*arg
)
151 if (get_user(val
, arg
))
154 set_bit(TTY_PTY_LOCK
, &tty
->flags
);
156 clear_bit(TTY_PTY_LOCK
, &tty
->flags
);
160 static int pty_get_lock(struct tty_struct
*tty
, int __user
*arg
)
162 int locked
= test_bit(TTY_PTY_LOCK
, &tty
->flags
);
163 return put_user(locked
, arg
);
166 /* Set the packet mode on a pty */
167 static int pty_set_pktmode(struct tty_struct
*tty
, int __user
*arg
)
171 if (get_user(pktmode
, arg
))
174 spin_lock_irq(&tty
->ctrl_lock
);
177 tty
->link
->ctrl_status
= 0;
183 spin_unlock_irq(&tty
->ctrl_lock
);
188 /* Get the packet mode of a pty */
189 static int pty_get_pktmode(struct tty_struct
*tty
, int __user
*arg
)
191 int pktmode
= tty
->packet
;
192 return put_user(pktmode
, arg
);
195 /* Send a signal to the slave */
196 static int pty_signal(struct tty_struct
*tty
, int sig
)
200 if (sig
!= SIGINT
&& sig
!= SIGQUIT
&& sig
!= SIGTSTP
)
204 pgrp
= tty_get_pgrp(tty
->link
);
206 kill_pgrp(pgrp
, sig
, 1);
212 static void pty_flush_buffer(struct tty_struct
*tty
)
214 struct tty_struct
*to
= tty
->link
;
215 struct tty_ldisc
*ld
;
220 ld
= tty_ldisc_ref(to
);
221 tty_buffer_flush(to
, ld
);
226 spin_lock_irq(&tty
->ctrl_lock
);
227 tty
->ctrl_status
|= TIOCPKT_FLUSHWRITE
;
228 wake_up_interruptible(&to
->read_wait
);
229 spin_unlock_irq(&tty
->ctrl_lock
);
233 static int pty_open(struct tty_struct
*tty
, struct file
*filp
)
235 if (!tty
|| !tty
->link
)
238 if (test_bit(TTY_OTHER_CLOSED
, &tty
->flags
))
240 if (test_bit(TTY_PTY_LOCK
, &tty
->link
->flags
))
242 if (tty
->driver
->subtype
== PTY_TYPE_SLAVE
&& tty
->link
->count
!= 1)
245 clear_bit(TTY_IO_ERROR
, &tty
->flags
);
246 clear_bit(TTY_OTHER_CLOSED
, &tty
->link
->flags
);
247 set_bit(TTY_THROTTLED
, &tty
->flags
);
251 set_bit(TTY_IO_ERROR
, &tty
->flags
);
255 static void pty_set_termios(struct tty_struct
*tty
,
256 struct ktermios
*old_termios
)
258 /* See if packet mode change of state. */
259 if (tty
->link
&& tty
->link
->packet
) {
260 int extproc
= (old_termios
->c_lflag
& EXTPROC
) |
261 (tty
->termios
.c_lflag
& EXTPROC
);
262 int old_flow
= ((old_termios
->c_iflag
& IXON
) &&
263 (old_termios
->c_cc
[VSTOP
] == '\023') &&
264 (old_termios
->c_cc
[VSTART
] == '\021'));
265 int new_flow
= (I_IXON(tty
) &&
266 STOP_CHAR(tty
) == '\023' &&
267 START_CHAR(tty
) == '\021');
268 if ((old_flow
!= new_flow
) || extproc
) {
269 spin_lock_irq(&tty
->ctrl_lock
);
270 if (old_flow
!= new_flow
) {
271 tty
->ctrl_status
&= ~(TIOCPKT_DOSTOP
| TIOCPKT_NOSTOP
);
273 tty
->ctrl_status
|= TIOCPKT_DOSTOP
;
275 tty
->ctrl_status
|= TIOCPKT_NOSTOP
;
278 tty
->ctrl_status
|= TIOCPKT_IOCTL
;
279 spin_unlock_irq(&tty
->ctrl_lock
);
280 wake_up_interruptible(&tty
->link
->read_wait
);
284 tty
->termios
.c_cflag
&= ~(CSIZE
| PARENB
);
285 tty
->termios
.c_cflag
|= (CS8
| CREAD
);
289 * pty_do_resize - resize event
290 * @tty: tty being resized
291 * @ws: window size being set.
293 * Update the termios variables and send the necessary signals to
294 * peform a terminal resize correctly
297 static int pty_resize(struct tty_struct
*tty
, struct winsize
*ws
)
299 struct pid
*pgrp
, *rpgrp
;
300 struct tty_struct
*pty
= tty
->link
;
302 /* For a PTY we need to lock the tty side */
303 mutex_lock(&tty
->winsize_mutex
);
304 if (!memcmp(ws
, &tty
->winsize
, sizeof(*ws
)))
307 /* Signal the foreground process group of both ptys */
308 pgrp
= tty_get_pgrp(tty
);
309 rpgrp
= tty_get_pgrp(pty
);
312 kill_pgrp(pgrp
, SIGWINCH
, 1);
313 if (rpgrp
!= pgrp
&& rpgrp
)
314 kill_pgrp(rpgrp
, SIGWINCH
, 1);
320 pty
->winsize
= *ws
; /* Never used so will go away soon */
322 mutex_unlock(&tty
->winsize_mutex
);
327 * pty_start - start() handler
328 * pty_stop - stop() handler
329 * @tty: tty being flow-controlled
331 * Propagates the TIOCPKT status to the master pty.
333 * NB: only the master pty can be in packet mode so only the slave
334 * needs start()/stop() handlers
336 static void pty_start(struct tty_struct
*tty
)
340 if (tty
->link
&& tty
->link
->packet
) {
341 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
342 tty
->ctrl_status
&= ~TIOCPKT_STOP
;
343 tty
->ctrl_status
|= TIOCPKT_START
;
344 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
345 wake_up_interruptible_poll(&tty
->link
->read_wait
, POLLIN
);
349 static void pty_stop(struct tty_struct
*tty
)
353 if (tty
->link
&& tty
->link
->packet
) {
354 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
355 tty
->ctrl_status
&= ~TIOCPKT_START
;
356 tty
->ctrl_status
|= TIOCPKT_STOP
;
357 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
358 wake_up_interruptible_poll(&tty
->link
->read_wait
, POLLIN
);
363 * pty_common_install - set up the pty pair
364 * @driver: the pty driver
365 * @tty: the tty being instantiated
366 * @legacy: true if this is BSD style
368 * Perform the initial set up for the tty/pty pair. Called from the
369 * tty layer when the port is first opened.
371 * Locking: the caller must hold the tty_mutex
373 static int pty_common_install(struct tty_driver
*driver
, struct tty_struct
*tty
,
376 struct tty_struct
*o_tty
;
377 struct tty_port
*ports
[2];
378 int idx
= tty
->index
;
379 int retval
= -ENOMEM
;
381 /* Opening the slave first has always returned -EIO */
382 if (driver
->subtype
!= PTY_TYPE_MASTER
)
385 ports
[0] = kmalloc(sizeof **ports
, GFP_KERNEL
);
386 ports
[1] = kmalloc(sizeof **ports
, GFP_KERNEL
);
387 if (!ports
[0] || !ports
[1])
389 if (!try_module_get(driver
->other
->owner
)) {
390 /* This cannot in fact currently happen */
393 o_tty
= alloc_tty_struct(driver
->other
, idx
);
397 tty_set_lock_subclass(o_tty
);
398 lockdep_set_subclass(&o_tty
->termios_rwsem
, TTY_LOCK_SLAVE
);
401 /* We always use new tty termios data so we can do this
403 retval
= tty_init_termios(tty
);
407 retval
= tty_init_termios(o_tty
);
409 goto err_free_termios
;
411 driver
->other
->ttys
[idx
] = o_tty
;
412 driver
->ttys
[idx
] = tty
;
414 memset(&tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
415 tty
->termios
= driver
->init_termios
;
416 memset(&o_tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
417 o_tty
->termios
= driver
->other
->init_termios
;
421 * Everything allocated ... set up the o_tty structure.
423 tty_driver_kref_get(driver
->other
);
424 /* Establish the links in both directions */
427 tty_port_init(ports
[0]);
428 tty_port_init(ports
[1]);
429 tty_buffer_set_limit(ports
[0], 8192);
430 tty_buffer_set_limit(ports
[1], 8192);
431 o_tty
->port
= ports
[0];
432 tty
->port
= ports
[1];
433 o_tty
->port
->itty
= o_tty
;
435 tty_buffer_set_lock_subclass(o_tty
->port
);
437 tty_driver_kref_get(driver
);
443 tty_free_termios(tty
);
445 deinitialize_tty_struct(o_tty
);
446 free_tty_struct(o_tty
);
448 module_put(driver
->other
->owner
);
455 static void pty_cleanup(struct tty_struct
*tty
)
457 tty_port_put(tty
->port
);
460 /* Traditional BSD devices */
461 #ifdef CONFIG_LEGACY_PTYS
463 static int pty_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
465 return pty_common_install(driver
, tty
, true);
468 static void pty_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
470 struct tty_struct
*pair
= tty
->link
;
471 driver
->ttys
[tty
->index
] = NULL
;
473 pair
->driver
->ttys
[pair
->index
] = NULL
;
476 static int pty_bsd_ioctl(struct tty_struct
*tty
,
477 unsigned int cmd
, unsigned long arg
)
480 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
481 return pty_set_lock(tty
, (int __user
*) arg
);
482 case TIOCGPTLCK
: /* Get PT Lock status */
483 return pty_get_lock(tty
, (int __user
*)arg
);
484 case TIOCPKT
: /* Set PT packet mode */
485 return pty_set_pktmode(tty
, (int __user
*)arg
);
486 case TIOCGPKT
: /* Get PT packet mode */
487 return pty_get_pktmode(tty
, (int __user
*)arg
);
488 case TIOCSIG
: /* Send signal to other side of pty */
489 return pty_signal(tty
, (int) arg
);
490 case TIOCGPTN
: /* TTY returns ENOTTY, but glibc expects EINVAL here */
496 static int legacy_count
= CONFIG_LEGACY_PTY_COUNT
;
497 module_param(legacy_count
, int, 0);
500 * The master side of a pty can do TIOCSPTLCK and thus
503 static const struct tty_operations master_pty_ops_bsd
= {
504 .install
= pty_install
,
508 .write_room
= pty_write_room
,
509 .flush_buffer
= pty_flush_buffer
,
510 .chars_in_buffer
= pty_chars_in_buffer
,
511 .unthrottle
= pty_unthrottle
,
512 .ioctl
= pty_bsd_ioctl
,
513 .cleanup
= pty_cleanup
,
514 .resize
= pty_resize
,
518 static const struct tty_operations slave_pty_ops_bsd
= {
519 .install
= pty_install
,
523 .write_room
= pty_write_room
,
524 .flush_buffer
= pty_flush_buffer
,
525 .chars_in_buffer
= pty_chars_in_buffer
,
526 .unthrottle
= pty_unthrottle
,
527 .set_termios
= pty_set_termios
,
528 .cleanup
= pty_cleanup
,
529 .resize
= pty_resize
,
535 static void __init
legacy_pty_init(void)
537 struct tty_driver
*pty_driver
, *pty_slave_driver
;
539 if (legacy_count
<= 0)
542 pty_driver
= tty_alloc_driver(legacy_count
,
543 TTY_DRIVER_RESET_TERMIOS
|
544 TTY_DRIVER_REAL_RAW
|
545 TTY_DRIVER_DYNAMIC_ALLOC
);
546 if (IS_ERR(pty_driver
))
547 panic("Couldn't allocate pty driver");
549 pty_slave_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_slave_driver
))
554 panic("Couldn't allocate pty slave driver");
556 pty_driver
->driver_name
= "pty_master";
557 pty_driver
->name
= "pty";
558 pty_driver
->major
= PTY_MASTER_MAJOR
;
559 pty_driver
->minor_start
= 0;
560 pty_driver
->type
= TTY_DRIVER_TYPE_PTY
;
561 pty_driver
->subtype
= PTY_TYPE_MASTER
;
562 pty_driver
->init_termios
= tty_std_termios
;
563 pty_driver
->init_termios
.c_iflag
= 0;
564 pty_driver
->init_termios
.c_oflag
= 0;
565 pty_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
566 pty_driver
->init_termios
.c_lflag
= 0;
567 pty_driver
->init_termios
.c_ispeed
= 38400;
568 pty_driver
->init_termios
.c_ospeed
= 38400;
569 pty_driver
->other
= pty_slave_driver
;
570 tty_set_operations(pty_driver
, &master_pty_ops_bsd
);
572 pty_slave_driver
->driver_name
= "pty_slave";
573 pty_slave_driver
->name
= "ttyp";
574 pty_slave_driver
->major
= PTY_SLAVE_MAJOR
;
575 pty_slave_driver
->minor_start
= 0;
576 pty_slave_driver
->type
= TTY_DRIVER_TYPE_PTY
;
577 pty_slave_driver
->subtype
= PTY_TYPE_SLAVE
;
578 pty_slave_driver
->init_termios
= tty_std_termios
;
579 pty_slave_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
580 pty_slave_driver
->init_termios
.c_ispeed
= 38400;
581 pty_slave_driver
->init_termios
.c_ospeed
= 38400;
582 pty_slave_driver
->other
= pty_driver
;
583 tty_set_operations(pty_slave_driver
, &slave_pty_ops_bsd
);
585 if (tty_register_driver(pty_driver
))
586 panic("Couldn't register pty driver");
587 if (tty_register_driver(pty_slave_driver
))
588 panic("Couldn't register pty slave driver");
591 static inline void legacy_pty_init(void) { }
595 #ifdef CONFIG_UNIX98_PTYS
597 static struct cdev ptmx_cdev
;
599 static int pty_unix98_ioctl(struct tty_struct
*tty
,
600 unsigned int cmd
, unsigned long arg
)
603 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
604 return pty_set_lock(tty
, (int __user
*)arg
);
605 case TIOCGPTLCK
: /* Get PT Lock status */
606 return pty_get_lock(tty
, (int __user
*)arg
);
607 case TIOCPKT
: /* Set PT packet mode */
608 return pty_set_pktmode(tty
, (int __user
*)arg
);
609 case TIOCGPKT
: /* Get PT packet mode */
610 return pty_get_pktmode(tty
, (int __user
*)arg
);
611 case TIOCGPTN
: /* Get PT Number */
612 return put_user(tty
->index
, (unsigned int __user
*)arg
);
613 case TIOCSIG
: /* Send signal to other side of pty */
614 return pty_signal(tty
, (int) arg
);
621 * ptm_unix98_lookup - find a pty master
622 * @driver: ptm driver
625 * Look up a pty master device. Called under the tty_mutex for now.
626 * This provides our locking.
629 static struct tty_struct
*ptm_unix98_lookup(struct tty_driver
*driver
,
630 struct inode
*ptm_inode
, int idx
)
632 /* Master must be open via /dev/ptmx */
633 return ERR_PTR(-EIO
);
637 * pts_unix98_lookup - find a pty slave
638 * @driver: pts driver
641 * Look up a pty master device. Called under the tty_mutex for now.
642 * This provides our locking for the tty pointer.
645 static struct tty_struct
*pts_unix98_lookup(struct tty_driver
*driver
,
646 struct inode
*pts_inode
, int idx
)
648 struct tty_struct
*tty
;
650 mutex_lock(&devpts_mutex
);
651 tty
= devpts_get_priv(pts_inode
);
652 mutex_unlock(&devpts_mutex
);
653 /* Master must be open before slave */
655 return ERR_PTR(-EIO
);
659 /* We have no need to install and remove our tty objects as devpts does all
662 static int pty_unix98_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
664 return pty_common_install(driver
, tty
, false);
667 static void pty_unix98_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
671 /* this is called once with whichever end is closed last */
672 static void pty_unix98_shutdown(struct tty_struct
*tty
)
674 devpts_kill_index(tty
->driver_data
, tty
->index
);
677 static const struct tty_operations ptm_unix98_ops
= {
678 .lookup
= ptm_unix98_lookup
,
679 .install
= pty_unix98_install
,
680 .remove
= pty_unix98_remove
,
684 .write_room
= pty_write_room
,
685 .flush_buffer
= pty_flush_buffer
,
686 .chars_in_buffer
= pty_chars_in_buffer
,
687 .unthrottle
= pty_unthrottle
,
688 .ioctl
= pty_unix98_ioctl
,
689 .resize
= pty_resize
,
690 .shutdown
= pty_unix98_shutdown
,
691 .cleanup
= pty_cleanup
694 static const struct tty_operations pty_unix98_ops
= {
695 .lookup
= pts_unix98_lookup
,
696 .install
= pty_unix98_install
,
697 .remove
= pty_unix98_remove
,
701 .write_room
= pty_write_room
,
702 .flush_buffer
= pty_flush_buffer
,
703 .chars_in_buffer
= pty_chars_in_buffer
,
704 .unthrottle
= pty_unthrottle
,
705 .set_termios
= pty_set_termios
,
708 .shutdown
= pty_unix98_shutdown
,
709 .cleanup
= pty_cleanup
,
713 * ptmx_open - open a unix 98 pty master
714 * @inode: inode of device file
715 * @filp: file pointer to tty
717 * Allocate a unix98 pty master device from the ptmx driver.
719 * Locking: tty_mutex protects the init_dev work. tty->count should
721 * allocated_ptys_lock handles the list of free pty numbers
724 static int ptmx_open(struct inode
*inode
, struct file
*filp
)
726 struct tty_struct
*tty
;
727 struct inode
*slave_inode
;
731 nonseekable_open(inode
, filp
);
733 /* We refuse fsnotify events on ptmx, since it's a shared resource */
734 filp
->f_mode
|= FMODE_NONOTIFY
;
736 retval
= tty_alloc_file(filp
);
740 /* find a device that is not in use. */
741 mutex_lock(&devpts_mutex
);
742 index
= devpts_new_index(inode
);
745 mutex_unlock(&devpts_mutex
);
749 mutex_unlock(&devpts_mutex
);
751 mutex_lock(&tty_mutex
);
752 tty
= tty_init_dev(ptm_driver
, index
);
755 retval
= PTR_ERR(tty
);
759 /* The tty returned here is locked so we can safely
761 mutex_unlock(&tty_mutex
);
763 set_bit(TTY_PTY_LOCK
, &tty
->flags
); /* LOCK THE SLAVE */
764 tty
->driver_data
= inode
;
766 tty_add_file(tty
, filp
);
768 slave_inode
= devpts_pty_new(inode
,
769 MKDEV(UNIX98_PTY_SLAVE_MAJOR
, index
), index
,
771 if (IS_ERR(slave_inode
)) {
772 retval
= PTR_ERR(slave_inode
);
775 tty
->link
->driver_data
= slave_inode
;
777 retval
= ptm_driver
->ops
->open(tty
, filp
);
785 tty_release(inode
, filp
);
788 mutex_unlock(&tty_mutex
);
789 devpts_kill_index(inode
, index
);
795 static struct file_operations ptmx_fops
;
797 static void __init
unix98_pty_init(void)
799 ptm_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
800 TTY_DRIVER_RESET_TERMIOS
|
801 TTY_DRIVER_REAL_RAW
|
802 TTY_DRIVER_DYNAMIC_DEV
|
803 TTY_DRIVER_DEVPTS_MEM
|
804 TTY_DRIVER_DYNAMIC_ALLOC
);
805 if (IS_ERR(ptm_driver
))
806 panic("Couldn't allocate Unix98 ptm driver");
807 pts_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
808 TTY_DRIVER_RESET_TERMIOS
|
809 TTY_DRIVER_REAL_RAW
|
810 TTY_DRIVER_DYNAMIC_DEV
|
811 TTY_DRIVER_DEVPTS_MEM
|
812 TTY_DRIVER_DYNAMIC_ALLOC
);
813 if (IS_ERR(pts_driver
))
814 panic("Couldn't allocate Unix98 pts driver");
816 ptm_driver
->driver_name
= "pty_master";
817 ptm_driver
->name
= "ptm";
818 ptm_driver
->major
= UNIX98_PTY_MASTER_MAJOR
;
819 ptm_driver
->minor_start
= 0;
820 ptm_driver
->type
= TTY_DRIVER_TYPE_PTY
;
821 ptm_driver
->subtype
= PTY_TYPE_MASTER
;
822 ptm_driver
->init_termios
= tty_std_termios
;
823 ptm_driver
->init_termios
.c_iflag
= 0;
824 ptm_driver
->init_termios
.c_oflag
= 0;
825 ptm_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
826 ptm_driver
->init_termios
.c_lflag
= 0;
827 ptm_driver
->init_termios
.c_ispeed
= 38400;
828 ptm_driver
->init_termios
.c_ospeed
= 38400;
829 ptm_driver
->other
= pts_driver
;
830 tty_set_operations(ptm_driver
, &ptm_unix98_ops
);
832 pts_driver
->driver_name
= "pty_slave";
833 pts_driver
->name
= "pts";
834 pts_driver
->major
= UNIX98_PTY_SLAVE_MAJOR
;
835 pts_driver
->minor_start
= 0;
836 pts_driver
->type
= TTY_DRIVER_TYPE_PTY
;
837 pts_driver
->subtype
= PTY_TYPE_SLAVE
;
838 pts_driver
->init_termios
= tty_std_termios
;
839 pts_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
840 pts_driver
->init_termios
.c_ispeed
= 38400;
841 pts_driver
->init_termios
.c_ospeed
= 38400;
842 pts_driver
->other
= ptm_driver
;
843 tty_set_operations(pts_driver
, &pty_unix98_ops
);
845 if (tty_register_driver(ptm_driver
))
846 panic("Couldn't register Unix98 ptm driver");
847 if (tty_register_driver(pts_driver
))
848 panic("Couldn't register Unix98 pts driver");
850 /* Now create the /dev/ptmx special device */
851 tty_default_fops(&ptmx_fops
);
852 ptmx_fops
.open
= ptmx_open
;
854 cdev_init(&ptmx_cdev
, &ptmx_fops
);
855 if (cdev_add(&ptmx_cdev
, MKDEV(TTYAUX_MAJOR
, 2), 1) ||
856 register_chrdev_region(MKDEV(TTYAUX_MAJOR
, 2), 1, "/dev/ptmx") < 0)
857 panic("Couldn't register /dev/ptmx driver");
858 device_create(tty_class
, NULL
, MKDEV(TTYAUX_MAJOR
, 2), NULL
, "ptmx");
862 static inline void unix98_pty_init(void) { }
865 static int __init
pty_init(void)
871 module_init(pty_init
);