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
)
183 if (get_user(pktmode
, arg
))
186 spin_lock_irq(&tty
->ctrl_lock
);
190 tty
->link
->ctrl_status
= 0;
194 spin_unlock_irq(&tty
->ctrl_lock
);
199 /* Get the packet mode of a pty */
200 static int pty_get_pktmode(struct tty_struct
*tty
, int __user
*arg
)
202 int pktmode
= tty
->packet
;
203 return put_user(pktmode
, arg
);
206 /* Send a signal to the slave */
207 static int pty_signal(struct tty_struct
*tty
, int sig
)
212 pgrp
= tty_get_pgrp(tty
->link
);
214 kill_pgrp(pgrp
, sig
, 1);
220 static void pty_flush_buffer(struct tty_struct
*tty
)
222 struct tty_struct
*to
= tty
->link
;
226 /* tty_buffer_flush(to); FIXME */
228 spin_lock_irq(&tty
->ctrl_lock
);
229 tty
->ctrl_status
|= TIOCPKT_FLUSHWRITE
;
230 wake_up_interruptible(&to
->read_wait
);
231 spin_unlock_irq(&tty
->ctrl_lock
);
235 static int pty_open(struct tty_struct
*tty
, struct file
*filp
)
237 if (!tty
|| !tty
->link
)
240 if (test_bit(TTY_OTHER_CLOSED
, &tty
->flags
))
242 if (test_bit(TTY_PTY_LOCK
, &tty
->link
->flags
))
244 if (tty
->driver
->subtype
== PTY_TYPE_SLAVE
&& tty
->link
->count
!= 1)
247 clear_bit(TTY_IO_ERROR
, &tty
->flags
);
248 clear_bit(TTY_OTHER_CLOSED
, &tty
->link
->flags
);
249 set_bit(TTY_THROTTLED
, &tty
->flags
);
253 set_bit(TTY_IO_ERROR
, &tty
->flags
);
257 static void pty_set_termios(struct tty_struct
*tty
,
258 struct ktermios
*old_termios
)
260 /* See if packet mode change of state. */
261 if (tty
->link
&& tty
->link
->packet
) {
262 int extproc
= (old_termios
->c_lflag
& EXTPROC
) |
263 (tty
->termios
.c_lflag
& EXTPROC
);
264 int old_flow
= ((old_termios
->c_iflag
& IXON
) &&
265 (old_termios
->c_cc
[VSTOP
] == '\023') &&
266 (old_termios
->c_cc
[VSTART
] == '\021'));
267 int new_flow
= (I_IXON(tty
) &&
268 STOP_CHAR(tty
) == '\023' &&
269 START_CHAR(tty
) == '\021');
270 if ((old_flow
!= new_flow
) || extproc
) {
271 spin_lock_irq(&tty
->ctrl_lock
);
272 if (old_flow
!= new_flow
) {
273 tty
->ctrl_status
&= ~(TIOCPKT_DOSTOP
| TIOCPKT_NOSTOP
);
275 tty
->ctrl_status
|= TIOCPKT_DOSTOP
;
277 tty
->ctrl_status
|= TIOCPKT_NOSTOP
;
280 tty
->ctrl_status
|= TIOCPKT_IOCTL
;
281 spin_unlock_irq(&tty
->ctrl_lock
);
282 wake_up_interruptible(&tty
->link
->read_wait
);
286 tty
->termios
.c_cflag
&= ~(CSIZE
| PARENB
);
287 tty
->termios
.c_cflag
|= (CS8
| CREAD
);
291 * pty_do_resize - resize event
292 * @tty: tty being resized
293 * @ws: window size being set.
295 * Update the termios variables and send the necessary signals to
296 * peform a terminal resize correctly
299 static int pty_resize(struct tty_struct
*tty
, struct winsize
*ws
)
301 struct pid
*pgrp
, *rpgrp
;
302 struct tty_struct
*pty
= tty
->link
;
304 /* For a PTY we need to lock the tty side */
305 mutex_lock(&tty
->winsize_mutex
);
306 if (!memcmp(ws
, &tty
->winsize
, sizeof(*ws
)))
309 /* Signal the foreground process group of both ptys */
310 pgrp
= tty_get_pgrp(tty
);
311 rpgrp
= tty_get_pgrp(pty
);
314 kill_pgrp(pgrp
, SIGWINCH
, 1);
315 if (rpgrp
!= pgrp
&& rpgrp
)
316 kill_pgrp(rpgrp
, SIGWINCH
, 1);
322 pty
->winsize
= *ws
; /* Never used so will go away soon */
324 mutex_unlock(&tty
->winsize_mutex
);
329 * pty_start - start() handler
330 * pty_stop - stop() handler
331 * @tty: tty being flow-controlled
333 * Propagates the TIOCPKT status to the master pty.
335 * NB: only the master pty can be in packet mode so only the slave
336 * needs start()/stop() handlers
338 static void pty_start(struct tty_struct
*tty
)
342 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
343 if (tty
->link
&& tty
->link
->packet
) {
344 tty
->ctrl_status
&= ~TIOCPKT_STOP
;
345 tty
->ctrl_status
|= TIOCPKT_START
;
346 wake_up_interruptible_poll(&tty
->link
->read_wait
, POLLIN
);
348 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
351 static void pty_stop(struct tty_struct
*tty
)
355 spin_lock_irqsave(&tty
->ctrl_lock
, flags
);
356 if (tty
->link
&& tty
->link
->packet
) {
357 tty
->ctrl_status
&= ~TIOCPKT_START
;
358 tty
->ctrl_status
|= TIOCPKT_STOP
;
359 wake_up_interruptible_poll(&tty
->link
->read_wait
, POLLIN
);
361 spin_unlock_irqrestore(&tty
->ctrl_lock
, flags
);
365 * pty_common_install - set up the pty pair
366 * @driver: the pty driver
367 * @tty: the tty being instantiated
368 * @legacy: true if this is BSD style
370 * Perform the initial set up for the tty/pty pair. Called from the
371 * tty layer when the port is first opened.
373 * Locking: the caller must hold the tty_mutex
375 static int pty_common_install(struct tty_driver
*driver
, struct tty_struct
*tty
,
378 struct tty_struct
*o_tty
;
379 struct tty_port
*ports
[2];
380 int idx
= tty
->index
;
381 int retval
= -ENOMEM
;
383 ports
[0] = kmalloc(sizeof **ports
, GFP_KERNEL
);
384 ports
[1] = kmalloc(sizeof **ports
, GFP_KERNEL
);
385 if (!ports
[0] || !ports
[1])
387 if (!try_module_get(driver
->other
->owner
)) {
388 /* This cannot in fact currently happen */
391 o_tty
= alloc_tty_struct(driver
->other
, idx
);
396 /* We always use new tty termios data so we can do this
398 retval
= tty_init_termios(tty
);
402 retval
= tty_init_termios(o_tty
);
404 goto err_free_termios
;
406 driver
->other
->ttys
[idx
] = o_tty
;
407 driver
->ttys
[idx
] = tty
;
409 memset(&tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
410 tty
->termios
= driver
->init_termios
;
411 memset(&o_tty
->termios_locked
, 0, sizeof(tty
->termios_locked
));
412 o_tty
->termios
= driver
->other
->init_termios
;
416 * Everything allocated ... set up the o_tty structure.
418 tty_driver_kref_get(driver
->other
);
419 if (driver
->subtype
== PTY_TYPE_MASTER
)
421 /* Establish the links in both directions */
424 tty_port_init(ports
[0]);
425 tty_port_init(ports
[1]);
426 o_tty
->port
= ports
[0];
427 tty
->port
= ports
[1];
428 o_tty
->port
->itty
= o_tty
;
430 tty_driver_kref_get(driver
);
435 tty_free_termios(tty
);
437 deinitialize_tty_struct(o_tty
);
438 free_tty_struct(o_tty
);
440 module_put(driver
->other
->owner
);
447 static void pty_cleanup(struct tty_struct
*tty
)
449 tty_port_put(tty
->port
);
452 /* Traditional BSD devices */
453 #ifdef CONFIG_LEGACY_PTYS
455 static int pty_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
457 return pty_common_install(driver
, tty
, true);
460 static void pty_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
462 struct tty_struct
*pair
= tty
->link
;
463 driver
->ttys
[tty
->index
] = NULL
;
465 pair
->driver
->ttys
[pair
->index
] = NULL
;
468 static int pty_bsd_ioctl(struct tty_struct
*tty
,
469 unsigned int cmd
, unsigned long arg
)
472 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
473 return pty_set_lock(tty
, (int __user
*) arg
);
474 case TIOCGPTLCK
: /* Get PT Lock status */
475 return pty_get_lock(tty
, (int __user
*)arg
);
476 case TIOCPKT
: /* Set PT packet mode */
477 return pty_set_pktmode(tty
, (int __user
*)arg
);
478 case TIOCGPKT
: /* Get PT packet mode */
479 return pty_get_pktmode(tty
, (int __user
*)arg
);
480 case TIOCSIG
: /* Send signal to other side of pty */
481 return pty_signal(tty
, (int) arg
);
482 case TIOCGPTN
: /* TTY returns ENOTTY, but glibc expects EINVAL here */
488 static int legacy_count
= CONFIG_LEGACY_PTY_COUNT
;
489 module_param(legacy_count
, int, 0);
492 * The master side of a pty can do TIOCSPTLCK and thus
495 static const struct tty_operations master_pty_ops_bsd
= {
496 .install
= pty_install
,
500 .write_room
= pty_write_room
,
501 .flush_buffer
= pty_flush_buffer
,
502 .chars_in_buffer
= pty_chars_in_buffer
,
503 .unthrottle
= pty_unthrottle
,
504 .ioctl
= pty_bsd_ioctl
,
505 .cleanup
= pty_cleanup
,
506 .resize
= pty_resize
,
510 static const struct tty_operations slave_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 .set_termios
= pty_set_termios
,
520 .cleanup
= pty_cleanup
,
521 .resize
= pty_resize
,
527 static void __init
legacy_pty_init(void)
529 struct tty_driver
*pty_driver
, *pty_slave_driver
;
531 if (legacy_count
<= 0)
534 pty_driver
= tty_alloc_driver(legacy_count
,
535 TTY_DRIVER_RESET_TERMIOS
|
536 TTY_DRIVER_REAL_RAW
|
537 TTY_DRIVER_DYNAMIC_ALLOC
);
538 if (IS_ERR(pty_driver
))
539 panic("Couldn't allocate pty driver");
541 pty_slave_driver
= tty_alloc_driver(legacy_count
,
542 TTY_DRIVER_RESET_TERMIOS
|
543 TTY_DRIVER_REAL_RAW
|
544 TTY_DRIVER_DYNAMIC_ALLOC
);
545 if (IS_ERR(pty_slave_driver
))
546 panic("Couldn't allocate pty slave driver");
548 pty_driver
->driver_name
= "pty_master";
549 pty_driver
->name
= "pty";
550 pty_driver
->major
= PTY_MASTER_MAJOR
;
551 pty_driver
->minor_start
= 0;
552 pty_driver
->type
= TTY_DRIVER_TYPE_PTY
;
553 pty_driver
->subtype
= PTY_TYPE_MASTER
;
554 pty_driver
->init_termios
= tty_std_termios
;
555 pty_driver
->init_termios
.c_iflag
= 0;
556 pty_driver
->init_termios
.c_oflag
= 0;
557 pty_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
558 pty_driver
->init_termios
.c_lflag
= 0;
559 pty_driver
->init_termios
.c_ispeed
= 38400;
560 pty_driver
->init_termios
.c_ospeed
= 38400;
561 pty_driver
->other
= pty_slave_driver
;
562 tty_set_operations(pty_driver
, &master_pty_ops_bsd
);
564 pty_slave_driver
->driver_name
= "pty_slave";
565 pty_slave_driver
->name
= "ttyp";
566 pty_slave_driver
->major
= PTY_SLAVE_MAJOR
;
567 pty_slave_driver
->minor_start
= 0;
568 pty_slave_driver
->type
= TTY_DRIVER_TYPE_PTY
;
569 pty_slave_driver
->subtype
= PTY_TYPE_SLAVE
;
570 pty_slave_driver
->init_termios
= tty_std_termios
;
571 pty_slave_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
572 pty_slave_driver
->init_termios
.c_ispeed
= 38400;
573 pty_slave_driver
->init_termios
.c_ospeed
= 38400;
574 pty_slave_driver
->other
= pty_driver
;
575 tty_set_operations(pty_slave_driver
, &slave_pty_ops_bsd
);
577 if (tty_register_driver(pty_driver
))
578 panic("Couldn't register pty driver");
579 if (tty_register_driver(pty_slave_driver
))
580 panic("Couldn't register pty slave driver");
583 static inline void legacy_pty_init(void) { }
587 #ifdef CONFIG_UNIX98_PTYS
589 static struct cdev ptmx_cdev
;
591 static int pty_unix98_ioctl(struct tty_struct
*tty
,
592 unsigned int cmd
, unsigned long arg
)
595 case TIOCSPTLCK
: /* Set PT Lock (disallow slave open) */
596 return pty_set_lock(tty
, (int __user
*)arg
);
597 case TIOCGPTLCK
: /* Get PT Lock status */
598 return pty_get_lock(tty
, (int __user
*)arg
);
599 case TIOCPKT
: /* Set PT packet mode */
600 return pty_set_pktmode(tty
, (int __user
*)arg
);
601 case TIOCGPKT
: /* Get PT packet mode */
602 return pty_get_pktmode(tty
, (int __user
*)arg
);
603 case TIOCGPTN
: /* Get PT Number */
604 return put_user(tty
->index
, (unsigned int __user
*)arg
);
605 case TIOCSIG
: /* Send signal to other side of pty */
606 return pty_signal(tty
, (int) arg
);
613 * ptm_unix98_lookup - find a pty master
614 * @driver: ptm driver
617 * Look up a pty master device. Called under the tty_mutex for now.
618 * This provides our locking.
621 static struct tty_struct
*ptm_unix98_lookup(struct tty_driver
*driver
,
622 struct inode
*ptm_inode
, int idx
)
624 /* Master must be open via /dev/ptmx */
625 return ERR_PTR(-EIO
);
629 * pts_unix98_lookup - find a pty slave
630 * @driver: pts driver
633 * Look up a pty master device. Called under the tty_mutex for now.
634 * This provides our locking for the tty pointer.
637 static struct tty_struct
*pts_unix98_lookup(struct tty_driver
*driver
,
638 struct inode
*pts_inode
, int idx
)
640 struct tty_struct
*tty
;
642 mutex_lock(&devpts_mutex
);
643 tty
= devpts_get_priv(pts_inode
);
644 mutex_unlock(&devpts_mutex
);
645 /* Master must be open before slave */
647 return ERR_PTR(-EIO
);
651 /* We have no need to install and remove our tty objects as devpts does all
654 static int pty_unix98_install(struct tty_driver
*driver
, struct tty_struct
*tty
)
656 return pty_common_install(driver
, tty
, false);
659 static void pty_unix98_remove(struct tty_driver
*driver
, struct tty_struct
*tty
)
663 /* this is called once with whichever end is closed last */
664 static void pty_unix98_shutdown(struct tty_struct
*tty
)
666 devpts_kill_index(tty
->driver_data
, tty
->index
);
669 static const struct tty_operations ptm_unix98_ops
= {
670 .lookup
= ptm_unix98_lookup
,
671 .install
= pty_unix98_install
,
672 .remove
= pty_unix98_remove
,
676 .write_room
= pty_write_room
,
677 .flush_buffer
= pty_flush_buffer
,
678 .chars_in_buffer
= pty_chars_in_buffer
,
679 .unthrottle
= pty_unthrottle
,
680 .ioctl
= pty_unix98_ioctl
,
681 .resize
= pty_resize
,
682 .shutdown
= pty_unix98_shutdown
,
683 .cleanup
= pty_cleanup
686 static const struct tty_operations pty_unix98_ops
= {
687 .lookup
= pts_unix98_lookup
,
688 .install
= pty_unix98_install
,
689 .remove
= pty_unix98_remove
,
693 .write_room
= pty_write_room
,
694 .flush_buffer
= pty_flush_buffer
,
695 .chars_in_buffer
= pty_chars_in_buffer
,
696 .unthrottle
= pty_unthrottle
,
697 .set_termios
= pty_set_termios
,
700 .shutdown
= pty_unix98_shutdown
,
701 .cleanup
= pty_cleanup
,
705 * ptmx_open - open a unix 98 pty master
706 * @inode: inode of device file
707 * @filp: file pointer to tty
709 * Allocate a unix98 pty master device from the ptmx driver.
711 * Locking: tty_mutex protects the init_dev work. tty->count should
713 * allocated_ptys_lock handles the list of free pty numbers
716 static int ptmx_open(struct inode
*inode
, struct file
*filp
)
718 struct tty_struct
*tty
;
719 struct inode
*slave_inode
;
723 nonseekable_open(inode
, filp
);
725 /* We refuse fsnotify events on ptmx, since it's a shared resource */
726 filp
->f_mode
|= FMODE_NONOTIFY
;
728 retval
= tty_alloc_file(filp
);
732 /* find a device that is not in use. */
733 mutex_lock(&devpts_mutex
);
734 index
= devpts_new_index(inode
);
737 mutex_unlock(&devpts_mutex
);
741 mutex_unlock(&devpts_mutex
);
743 mutex_lock(&tty_mutex
);
744 tty
= tty_init_dev(ptm_driver
, index
);
747 retval
= PTR_ERR(tty
);
751 /* The tty returned here is locked so we can safely
753 mutex_unlock(&tty_mutex
);
755 set_bit(TTY_PTY_LOCK
, &tty
->flags
); /* LOCK THE SLAVE */
756 tty
->driver_data
= inode
;
758 tty_add_file(tty
, filp
);
760 slave_inode
= devpts_pty_new(inode
,
761 MKDEV(UNIX98_PTY_SLAVE_MAJOR
, index
), index
,
763 if (IS_ERR(slave_inode
)) {
764 retval
= PTR_ERR(slave_inode
);
767 tty
->link
->driver_data
= slave_inode
;
769 retval
= ptm_driver
->ops
->open(tty
, filp
);
777 tty_release(inode
, filp
);
780 mutex_unlock(&tty_mutex
);
781 devpts_kill_index(inode
, index
);
787 static struct file_operations ptmx_fops
;
789 static void __init
unix98_pty_init(void)
791 ptm_driver
= tty_alloc_driver(NR_UNIX98_PTY_MAX
,
792 TTY_DRIVER_RESET_TERMIOS
|
793 TTY_DRIVER_REAL_RAW
|
794 TTY_DRIVER_DYNAMIC_DEV
|
795 TTY_DRIVER_DEVPTS_MEM
|
796 TTY_DRIVER_DYNAMIC_ALLOC
);
797 if (IS_ERR(ptm_driver
))
798 panic("Couldn't allocate Unix98 ptm driver");
799 pts_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(pts_driver
))
806 panic("Couldn't allocate Unix98 pts driver");
808 ptm_driver
->driver_name
= "pty_master";
809 ptm_driver
->name
= "ptm";
810 ptm_driver
->major
= UNIX98_PTY_MASTER_MAJOR
;
811 ptm_driver
->minor_start
= 0;
812 ptm_driver
->type
= TTY_DRIVER_TYPE_PTY
;
813 ptm_driver
->subtype
= PTY_TYPE_MASTER
;
814 ptm_driver
->init_termios
= tty_std_termios
;
815 ptm_driver
->init_termios
.c_iflag
= 0;
816 ptm_driver
->init_termios
.c_oflag
= 0;
817 ptm_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
818 ptm_driver
->init_termios
.c_lflag
= 0;
819 ptm_driver
->init_termios
.c_ispeed
= 38400;
820 ptm_driver
->init_termios
.c_ospeed
= 38400;
821 ptm_driver
->other
= pts_driver
;
822 tty_set_operations(ptm_driver
, &ptm_unix98_ops
);
824 pts_driver
->driver_name
= "pty_slave";
825 pts_driver
->name
= "pts";
826 pts_driver
->major
= UNIX98_PTY_SLAVE_MAJOR
;
827 pts_driver
->minor_start
= 0;
828 pts_driver
->type
= TTY_DRIVER_TYPE_PTY
;
829 pts_driver
->subtype
= PTY_TYPE_SLAVE
;
830 pts_driver
->init_termios
= tty_std_termios
;
831 pts_driver
->init_termios
.c_cflag
= B38400
| CS8
| CREAD
;
832 pts_driver
->init_termios
.c_ispeed
= 38400;
833 pts_driver
->init_termios
.c_ospeed
= 38400;
834 pts_driver
->other
= ptm_driver
;
835 tty_set_operations(pts_driver
, &pty_unix98_ops
);
837 if (tty_register_driver(ptm_driver
))
838 panic("Couldn't register Unix98 ptm driver");
839 if (tty_register_driver(pts_driver
))
840 panic("Couldn't register Unix98 pts driver");
842 /* Now create the /dev/ptmx special device */
843 tty_default_fops(&ptmx_fops
);
844 ptmx_fops
.open
= ptmx_open
;
846 cdev_init(&ptmx_cdev
, &ptmx_fops
);
847 if (cdev_add(&ptmx_cdev
, MKDEV(TTYAUX_MAJOR
, 2), 1) ||
848 register_chrdev_region(MKDEV(TTYAUX_MAJOR
, 2), 1, "/dev/ptmx") < 0)
849 panic("Couldn't register /dev/ptmx driver");
850 device_create(tty_class
, NULL
, MKDEV(TTYAUX_MAJOR
, 2), NULL
, "ptmx");
854 static inline void unix98_pty_init(void) { }
857 static int __init
pty_init(void)
863 module_init(pty_init
);