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-rw-r--r--drivers/tty/pty.c777
1 files changed, 777 insertions, 0 deletions
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
new file mode 100644
index 000000000000..98b6e3bdb000
--- /dev/null
+++ b/drivers/tty/pty.c
@@ -0,0 +1,777 @@
1/*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 *
4 * Added support for a Unix98-style ptmx device.
5 * -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998
6 *
7 * When reading this code see also fs/devpts. In particular note that the
8 * driver_data field is used by the devpts side as a binding to the devpts
9 * inode.
10 */
11
12#include <linux/module.h>
13
14#include <linux/errno.h>
15#include <linux/interrupt.h>
16#include <linux/tty.h>
17#include <linux/tty_flip.h>
18#include <linux/fcntl.h>
19#include <linux/sched.h>
20#include <linux/string.h>
21#include <linux/major.h>
22#include <linux/mm.h>
23#include <linux/init.h>
24#include <linux/sysctl.h>
25#include <linux/device.h>
26#include <linux/uaccess.h>
27#include <linux/bitops.h>
28#include <linux/devpts_fs.h>
29#include <linux/slab.h>
30
31#include <asm/system.h>
32
33#ifdef CONFIG_UNIX98_PTYS
34static struct tty_driver *ptm_driver;
35static struct tty_driver *pts_driver;
36#endif
37
38static void pty_close(struct tty_struct *tty, struct file *filp)
39{
40 BUG_ON(!tty);
41 if (tty->driver->subtype == PTY_TYPE_MASTER)
42 WARN_ON(tty->count > 1);
43 else {
44 if (tty->count > 2)
45 return;
46 }
47 wake_up_interruptible(&tty->read_wait);
48 wake_up_interruptible(&tty->write_wait);
49 tty->packet = 0;
50 if (!tty->link)
51 return;
52 tty->link->packet = 0;
53 set_bit(TTY_OTHER_CLOSED, &tty->link->flags);
54 wake_up_interruptible(&tty->link->read_wait);
55 wake_up_interruptible(&tty->link->write_wait);
56 if (tty->driver->subtype == PTY_TYPE_MASTER) {
57 set_bit(TTY_OTHER_CLOSED, &tty->flags);
58#ifdef CONFIG_UNIX98_PTYS
59 if (tty->driver == ptm_driver)
60 devpts_pty_kill(tty->link);
61#endif
62 tty_unlock();
63 tty_vhangup(tty->link);
64 tty_lock();
65 }
66}
67
68/*
69 * The unthrottle routine is called by the line discipline to signal
70 * that it can receive more characters. For PTY's, the TTY_THROTTLED
71 * flag is always set, to force the line discipline to always call the
72 * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE
73 * characters in the queue. This is necessary since each time this
74 * happens, we need to wake up any sleeping processes that could be
75 * (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
76 * for the pty buffer to be drained.
77 */
78static void pty_unthrottle(struct tty_struct *tty)
79{
80 tty_wakeup(tty->link);
81 set_bit(TTY_THROTTLED, &tty->flags);
82}
83
84/**
85 * pty_space - report space left for writing
86 * @to: tty we are writing into
87 *
88 * The tty buffers allow 64K but we sneak a peak and clip at 8K this
89 * allows a lot of overspill room for echo and other fun messes to
90 * be handled properly
91 */
92
93static int pty_space(struct tty_struct *to)
94{
95 int n = 8192 - to->buf.memory_used;
96 if (n < 0)
97 return 0;
98 return n;
99}
100
101/**
102 * pty_write - write to a pty
103 * @tty: the tty we write from
104 * @buf: kernel buffer of data
105 * @count: bytes to write
106 *
107 * Our "hardware" write method. Data is coming from the ldisc which
108 * may be in a non sleeping state. We simply throw this at the other
109 * end of the link as if we were an IRQ handler receiving stuff for
110 * the other side of the pty/tty pair.
111 */
112
113static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
114{
115 struct tty_struct *to = tty->link;
116
117 if (tty->stopped)
118 return 0;
119
120 if (c > 0) {
121 /* Stuff the data into the input queue of the other end */
122 c = tty_insert_flip_string(to, buf, c);
123 /* And shovel */
124 if (c) {
125 tty_flip_buffer_push(to);
126 tty_wakeup(tty);
127 }
128 }
129 return c;
130}
131
132/**
133 * pty_write_room - write space
134 * @tty: tty we are writing from
135 *
136 * Report how many bytes the ldisc can send into the queue for
137 * the other device.
138 */
139
140static int pty_write_room(struct tty_struct *tty)
141{
142 if (tty->stopped)
143 return 0;
144 return pty_space(tty->link);
145}
146
147/**
148 * pty_chars_in_buffer - characters currently in our tx queue
149 * @tty: our tty
150 *
151 * Report how much we have in the transmit queue. As everything is
152 * instantly at the other end this is easy to implement.
153 */
154
155static int pty_chars_in_buffer(struct tty_struct *tty)
156{
157 return 0;
158}
159
160/* Set the lock flag on a pty */
161static int pty_set_lock(struct tty_struct *tty, int __user *arg)
162{
163 int val;
164 if (get_user(val, arg))
165 return -EFAULT;
166 if (val)
167 set_bit(TTY_PTY_LOCK, &tty->flags);
168 else
169 clear_bit(TTY_PTY_LOCK, &tty->flags);
170 return 0;
171}
172
173/* Send a signal to the slave */
174static int pty_signal(struct tty_struct *tty, int sig)
175{
176 unsigned long flags;
177 struct pid *pgrp;
178
179 if (tty->link) {
180 spin_lock_irqsave(&tty->link->ctrl_lock, flags);
181 pgrp = get_pid(tty->link->pgrp);
182 spin_unlock_irqrestore(&tty->link->ctrl_lock, flags);
183
184 kill_pgrp(pgrp, sig, 1);
185 put_pid(pgrp);
186 }
187 return 0;
188}
189
190static void pty_flush_buffer(struct tty_struct *tty)
191{
192 struct tty_struct *to = tty->link;
193 unsigned long flags;
194
195 if (!to)
196 return;
197 /* tty_buffer_flush(to); FIXME */
198 if (to->packet) {
199 spin_lock_irqsave(&tty->ctrl_lock, flags);
200 tty->ctrl_status |= TIOCPKT_FLUSHWRITE;
201 wake_up_interruptible(&to->read_wait);
202 spin_unlock_irqrestore(&tty->ctrl_lock, flags);
203 }
204}
205
206static int pty_open(struct tty_struct *tty, struct file *filp)
207{
208 int retval = -ENODEV;
209
210 if (!tty || !tty->link)
211 goto out;
212
213 retval = -EIO;
214 if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
215 goto out;
216 if (test_bit(TTY_PTY_LOCK, &tty->link->flags))
217 goto out;
218 if (tty->link->count != 1)
219 goto out;
220
221 clear_bit(TTY_OTHER_CLOSED, &tty->link->flags);
222 set_bit(TTY_THROTTLED, &tty->flags);
223 retval = 0;
224out:
225 return retval;
226}
227
228static void pty_set_termios(struct tty_struct *tty,
229 struct ktermios *old_termios)
230{
231 tty->termios->c_cflag &= ~(CSIZE | PARENB);
232 tty->termios->c_cflag |= (CS8 | CREAD);
233}
234
235/**
236 * pty_do_resize - resize event
237 * @tty: tty being resized
238 * @ws: window size being set.
239 *
240 * Update the termios variables and send the necessary signals to
241 * peform a terminal resize correctly
242 */
243
244int pty_resize(struct tty_struct *tty, struct winsize *ws)
245{
246 struct pid *pgrp, *rpgrp;
247 unsigned long flags;
248 struct tty_struct *pty = tty->link;
249
250 /* For a PTY we need to lock the tty side */
251 mutex_lock(&tty->termios_mutex);
252 if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
253 goto done;
254
255 /* Get the PID values and reference them so we can
256 avoid holding the tty ctrl lock while sending signals.
257 We need to lock these individually however. */
258
259 spin_lock_irqsave(&tty->ctrl_lock, flags);
260 pgrp = get_pid(tty->pgrp);
261 spin_unlock_irqrestore(&tty->ctrl_lock, flags);
262
263 spin_lock_irqsave(&pty->ctrl_lock, flags);
264 rpgrp = get_pid(pty->pgrp);
265 spin_unlock_irqrestore(&pty->ctrl_lock, flags);
266
267 if (pgrp)
268 kill_pgrp(pgrp, SIGWINCH, 1);
269 if (rpgrp != pgrp && rpgrp)
270 kill_pgrp(rpgrp, SIGWINCH, 1);
271
272 put_pid(pgrp);
273 put_pid(rpgrp);
274
275 tty->winsize = *ws;
276 pty->winsize = *ws; /* Never used so will go away soon */
277done:
278 mutex_unlock(&tty->termios_mutex);
279 return 0;
280}
281
282/* Traditional BSD devices */
283#ifdef CONFIG_LEGACY_PTYS
284
285static int pty_install(struct tty_driver *driver, struct tty_struct *tty)
286{
287 struct tty_struct *o_tty;
288 int idx = tty->index;
289 int retval;
290
291 o_tty = alloc_tty_struct();
292 if (!o_tty)
293 return -ENOMEM;
294 if (!try_module_get(driver->other->owner)) {
295 /* This cannot in fact currently happen */
296 retval = -ENOMEM;
297 goto err_free_tty;
298 }
299 initialize_tty_struct(o_tty, driver->other, idx);
300
301 /* We always use new tty termios data so we can do this
302 the easy way .. */
303 retval = tty_init_termios(tty);
304 if (retval)
305 goto err_deinit_tty;
306
307 retval = tty_init_termios(o_tty);
308 if (retval)
309 goto err_free_termios;
310
311 /*
312 * Everything allocated ... set up the o_tty structure.
313 */
314 driver->other->ttys[idx] = o_tty;
315 tty_driver_kref_get(driver->other);
316 if (driver->subtype == PTY_TYPE_MASTER)
317 o_tty->count++;
318 /* Establish the links in both directions */
319 tty->link = o_tty;
320 o_tty->link = tty;
321
322 tty_driver_kref_get(driver);
323 tty->count++;
324 driver->ttys[idx] = tty;
325 return 0;
326err_free_termios:
327 tty_free_termios(tty);
328err_deinit_tty:
329 deinitialize_tty_struct(o_tty);
330 module_put(o_tty->driver->owner);
331err_free_tty:
332 free_tty_struct(o_tty);
333 return retval;
334}
335
336static int pty_bsd_ioctl(struct tty_struct *tty,
337 unsigned int cmd, unsigned long arg)
338{
339 switch (cmd) {
340 case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
341 return pty_set_lock(tty, (int __user *) arg);
342 case TIOCSIG: /* Send signal to other side of pty */
343 return pty_signal(tty, (int) arg);
344 }
345 return -ENOIOCTLCMD;
346}
347
348static int legacy_count = CONFIG_LEGACY_PTY_COUNT;
349module_param(legacy_count, int, 0);
350
351/*
352 * The master side of a pty can do TIOCSPTLCK and thus
353 * has pty_bsd_ioctl.
354 */
355static const struct tty_operations master_pty_ops_bsd = {
356 .install = pty_install,
357 .open = pty_open,
358 .close = pty_close,
359 .write = pty_write,
360 .write_room = pty_write_room,
361 .flush_buffer = pty_flush_buffer,
362 .chars_in_buffer = pty_chars_in_buffer,
363 .unthrottle = pty_unthrottle,
364 .set_termios = pty_set_termios,
365 .ioctl = pty_bsd_ioctl,
366 .resize = pty_resize
367};
368
369static const struct tty_operations slave_pty_ops_bsd = {
370 .install = pty_install,
371 .open = pty_open,
372 .close = pty_close,
373 .write = pty_write,
374 .write_room = pty_write_room,
375 .flush_buffer = pty_flush_buffer,
376 .chars_in_buffer = pty_chars_in_buffer,
377 .unthrottle = pty_unthrottle,
378 .set_termios = pty_set_termios,
379 .resize = pty_resize
380};
381
382static void __init legacy_pty_init(void)
383{
384 struct tty_driver *pty_driver, *pty_slave_driver;
385
386 if (legacy_count <= 0)
387 return;
388
389 pty_driver = alloc_tty_driver(legacy_count);
390 if (!pty_driver)
391 panic("Couldn't allocate pty driver");
392
393 pty_slave_driver = alloc_tty_driver(legacy_count);
394 if (!pty_slave_driver)
395 panic("Couldn't allocate pty slave driver");
396
397 pty_driver->owner = THIS_MODULE;
398 pty_driver->driver_name = "pty_master";
399 pty_driver->name = "pty";
400 pty_driver->major = PTY_MASTER_MAJOR;
401 pty_driver->minor_start = 0;
402 pty_driver->type = TTY_DRIVER_TYPE_PTY;
403 pty_driver->subtype = PTY_TYPE_MASTER;
404 pty_driver->init_termios = tty_std_termios;
405 pty_driver->init_termios.c_iflag = 0;
406 pty_driver->init_termios.c_oflag = 0;
407 pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
408 pty_driver->init_termios.c_lflag = 0;
409 pty_driver->init_termios.c_ispeed = 38400;
410 pty_driver->init_termios.c_ospeed = 38400;
411 pty_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW;
412 pty_driver->other = pty_slave_driver;
413 tty_set_operations(pty_driver, &master_pty_ops_bsd);
414
415 pty_slave_driver->owner = THIS_MODULE;
416 pty_slave_driver->driver_name = "pty_slave";
417 pty_slave_driver->name = "ttyp";
418 pty_slave_driver->major = PTY_SLAVE_MAJOR;
419 pty_slave_driver->minor_start = 0;
420 pty_slave_driver->type = TTY_DRIVER_TYPE_PTY;
421 pty_slave_driver->subtype = PTY_TYPE_SLAVE;
422 pty_slave_driver->init_termios = tty_std_termios;
423 pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
424 pty_slave_driver->init_termios.c_ispeed = 38400;
425 pty_slave_driver->init_termios.c_ospeed = 38400;
426 pty_slave_driver->flags = TTY_DRIVER_RESET_TERMIOS |
427 TTY_DRIVER_REAL_RAW;
428 pty_slave_driver->other = pty_driver;
429 tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd);
430
431 if (tty_register_driver(pty_driver))
432 panic("Couldn't register pty driver");
433 if (tty_register_driver(pty_slave_driver))
434 panic("Couldn't register pty slave driver");
435}
436#else
437static inline void legacy_pty_init(void) { }
438#endif
439
440/* Unix98 devices */
441#ifdef CONFIG_UNIX98_PTYS
442/*
443 * sysctl support for setting limits on the number of Unix98 ptys allocated.
444 * Otherwise one can eat up all kernel memory by opening /dev/ptmx repeatedly.
445 */
446int pty_limit = NR_UNIX98_PTY_DEFAULT;
447static int pty_limit_min;
448static int pty_limit_max = NR_UNIX98_PTY_MAX;
449static int pty_count;
450
451static struct cdev ptmx_cdev;
452
453static struct ctl_table pty_table[] = {
454 {
455 .procname = "max",
456 .maxlen = sizeof(int),
457 .mode = 0644,
458 .data = &pty_limit,
459 .proc_handler = proc_dointvec_minmax,
460 .extra1 = &pty_limit_min,
461 .extra2 = &pty_limit_max,
462 }, {
463 .procname = "nr",
464 .maxlen = sizeof(int),
465 .mode = 0444,
466 .data = &pty_count,
467 .proc_handler = proc_dointvec,
468 },
469 {}
470};
471
472static struct ctl_table pty_kern_table[] = {
473 {
474 .procname = "pty",
475 .mode = 0555,
476 .child = pty_table,
477 },
478 {}
479};
480
481static struct ctl_table pty_root_table[] = {
482 {
483 .procname = "kernel",
484 .mode = 0555,
485 .child = pty_kern_table,
486 },
487 {}
488};
489
490
491static int pty_unix98_ioctl(struct tty_struct *tty,
492 unsigned int cmd, unsigned long arg)
493{
494 switch (cmd) {
495 case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
496 return pty_set_lock(tty, (int __user *)arg);
497 case TIOCGPTN: /* Get PT Number */
498 return put_user(tty->index, (unsigned int __user *)arg);
499 case TIOCSIG: /* Send signal to other side of pty */
500 return pty_signal(tty, (int) arg);
501 }
502
503 return -ENOIOCTLCMD;
504}
505
506/**
507 * ptm_unix98_lookup - find a pty master
508 * @driver: ptm driver
509 * @idx: tty index
510 *
511 * Look up a pty master device. Called under the tty_mutex for now.
512 * This provides our locking.
513 */
514
515static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver,
516 struct inode *ptm_inode, int idx)
517{
518 struct tty_struct *tty = devpts_get_tty(ptm_inode, idx);
519 if (tty)
520 tty = tty->link;
521 return tty;
522}
523
524/**
525 * pts_unix98_lookup - find a pty slave
526 * @driver: pts driver
527 * @idx: tty index
528 *
529 * Look up a pty master device. Called under the tty_mutex for now.
530 * This provides our locking.
531 */
532
533static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver,
534 struct inode *pts_inode, int idx)
535{
536 struct tty_struct *tty = devpts_get_tty(pts_inode, idx);
537 /* Master must be open before slave */
538 if (!tty)
539 return ERR_PTR(-EIO);
540 return tty;
541}
542
543static void pty_unix98_shutdown(struct tty_struct *tty)
544{
545 /* We have our own method as we don't use the tty index */
546 kfree(tty->termios);
547}
548
549/* We have no need to install and remove our tty objects as devpts does all
550 the work for us */
551
552static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty)
553{
554 struct tty_struct *o_tty;
555 int idx = tty->index;
556
557 o_tty = alloc_tty_struct();
558 if (!o_tty)
559 return -ENOMEM;
560 if (!try_module_get(driver->other->owner)) {
561 /* This cannot in fact currently happen */
562 goto err_free_tty;
563 }
564 initialize_tty_struct(o_tty, driver->other, idx);
565
566 tty->termios = kzalloc(sizeof(struct ktermios[2]), GFP_KERNEL);
567 if (tty->termios == NULL)
568 goto err_free_mem;
569 *tty->termios = driver->init_termios;
570 tty->termios_locked = tty->termios + 1;
571
572 o_tty->termios = kzalloc(sizeof(struct ktermios[2]), GFP_KERNEL);
573 if (o_tty->termios == NULL)
574 goto err_free_mem;
575 *o_tty->termios = driver->other->init_termios;
576 o_tty->termios_locked = o_tty->termios + 1;
577
578 tty_driver_kref_get(driver->other);
579 if (driver->subtype == PTY_TYPE_MASTER)
580 o_tty->count++;
581 /* Establish the links in both directions */
582 tty->link = o_tty;
583 o_tty->link = tty;
584 /*
585 * All structures have been allocated, so now we install them.
586 * Failures after this point use release_tty to clean up, so
587 * there's no need to null out the local pointers.
588 */
589 tty_driver_kref_get(driver);
590 tty->count++;
591 pty_count++;
592 return 0;
593err_free_mem:
594 deinitialize_tty_struct(o_tty);
595 kfree(o_tty->termios);
596 kfree(tty->termios);
597 module_put(o_tty->driver->owner);
598err_free_tty:
599 free_tty_struct(o_tty);
600 return -ENOMEM;
601}
602
603static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
604{
605 pty_count--;
606}
607
608static const struct tty_operations ptm_unix98_ops = {
609 .lookup = ptm_unix98_lookup,
610 .install = pty_unix98_install,
611 .remove = pty_unix98_remove,
612 .open = pty_open,
613 .close = pty_close,
614 .write = pty_write,
615 .write_room = pty_write_room,
616 .flush_buffer = pty_flush_buffer,
617 .chars_in_buffer = pty_chars_in_buffer,
618 .unthrottle = pty_unthrottle,
619 .set_termios = pty_set_termios,
620 .ioctl = pty_unix98_ioctl,
621 .shutdown = pty_unix98_shutdown,
622 .resize = pty_resize
623};
624
625static const struct tty_operations pty_unix98_ops = {
626 .lookup = pts_unix98_lookup,
627 .install = pty_unix98_install,
628 .remove = pty_unix98_remove,
629 .open = pty_open,
630 .close = pty_close,
631 .write = pty_write,
632 .write_room = pty_write_room,
633 .flush_buffer = pty_flush_buffer,
634 .chars_in_buffer = pty_chars_in_buffer,
635 .unthrottle = pty_unthrottle,
636 .set_termios = pty_set_termios,
637 .shutdown = pty_unix98_shutdown
638};
639
640/**
641 * ptmx_open - open a unix 98 pty master
642 * @inode: inode of device file
643 * @filp: file pointer to tty
644 *
645 * Allocate a unix98 pty master device from the ptmx driver.
646 *
647 * Locking: tty_mutex protects the init_dev work. tty->count should
648 * protect the rest.
649 * allocated_ptys_lock handles the list of free pty numbers
650 */
651
652static int ptmx_open(struct inode *inode, struct file *filp)
653{
654 struct tty_struct *tty;
655 int retval;
656 int index;
657
658 nonseekable_open(inode, filp);
659
660 /* find a device that is not in use. */
661 tty_lock();
662 index = devpts_new_index(inode);
663 tty_unlock();
664 if (index < 0)
665 return index;
666
667 mutex_lock(&tty_mutex);
668 tty_lock();
669 tty = tty_init_dev(ptm_driver, index, 1);
670 mutex_unlock(&tty_mutex);
671
672 if (IS_ERR(tty)) {
673 retval = PTR_ERR(tty);
674 goto out;
675 }
676
677 set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
678
679 retval = tty_add_file(tty, filp);
680 if (retval)
681 goto out;
682
683 retval = devpts_pty_new(inode, tty->link);
684 if (retval)
685 goto out1;
686
687 retval = ptm_driver->ops->open(tty, filp);
688 if (retval)
689 goto out2;
690out1:
691 tty_unlock();
692 return retval;
693out2:
694 tty_unlock();
695 tty_release(inode, filp);
696 return retval;
697out:
698 devpts_kill_index(inode, index);
699 tty_unlock();
700 return retval;
701}
702
703static struct file_operations ptmx_fops;
704
705static void __init unix98_pty_init(void)
706{
707 ptm_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX);
708 if (!ptm_driver)
709 panic("Couldn't allocate Unix98 ptm driver");
710 pts_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX);
711 if (!pts_driver)
712 panic("Couldn't allocate Unix98 pts driver");
713
714 ptm_driver->owner = THIS_MODULE;
715 ptm_driver->driver_name = "pty_master";
716 ptm_driver->name = "ptm";
717 ptm_driver->major = UNIX98_PTY_MASTER_MAJOR;
718 ptm_driver->minor_start = 0;
719 ptm_driver->type = TTY_DRIVER_TYPE_PTY;
720 ptm_driver->subtype = PTY_TYPE_MASTER;
721 ptm_driver->init_termios = tty_std_termios;
722 ptm_driver->init_termios.c_iflag = 0;
723 ptm_driver->init_termios.c_oflag = 0;
724 ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
725 ptm_driver->init_termios.c_lflag = 0;
726 ptm_driver->init_termios.c_ispeed = 38400;
727 ptm_driver->init_termios.c_ospeed = 38400;
728 ptm_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW |
729 TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM;
730 ptm_driver->other = pts_driver;
731 tty_set_operations(ptm_driver, &ptm_unix98_ops);
732
733 pts_driver->owner = THIS_MODULE;
734 pts_driver->driver_name = "pty_slave";
735 pts_driver->name = "pts";
736 pts_driver->major = UNIX98_PTY_SLAVE_MAJOR;
737 pts_driver->minor_start = 0;
738 pts_driver->type = TTY_DRIVER_TYPE_PTY;
739 pts_driver->subtype = PTY_TYPE_SLAVE;
740 pts_driver->init_termios = tty_std_termios;
741 pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
742 pts_driver->init_termios.c_ispeed = 38400;
743 pts_driver->init_termios.c_ospeed = 38400;
744 pts_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW |
745 TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM;
746 pts_driver->other = ptm_driver;
747 tty_set_operations(pts_driver, &pty_unix98_ops);
748
749 if (tty_register_driver(ptm_driver))
750 panic("Couldn't register Unix98 ptm driver");
751 if (tty_register_driver(pts_driver))
752 panic("Couldn't register Unix98 pts driver");
753
754 register_sysctl_table(pty_root_table);
755
756 /* Now create the /dev/ptmx special device */
757 tty_default_fops(&ptmx_fops);
758 ptmx_fops.open = ptmx_open;
759
760 cdev_init(&ptmx_cdev, &ptmx_fops);
761 if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) ||
762 register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0)
763 panic("Couldn't register /dev/ptmx driver\n");
764 device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx");
765}
766
767#else
768static inline void unix98_pty_init(void) { }
769#endif
770
771static int __init pty_init(void)
772{
773 legacy_pty_init();
774 unix98_pty_init();
775 return 0;
776}
777module_init(pty_init);
generated by cgit v1.2.2 (git 2.25.0) at 2025-04-25 23:30:53 -0400