Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
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 | |
1da177e4 | 6 | * |
1da177e4 LT |
7 | */ |
8 | ||
fe9cd962 | 9 | #include <linux/module.h> |
1da177e4 LT |
10 | |
11 | #include <linux/errno.h> | |
1da177e4 LT |
12 | #include <linux/interrupt.h> |
13 | #include <linux/tty.h> | |
14 | #include <linux/tty_flip.h> | |
15 | #include <linux/fcntl.h> | |
d43c36dc | 16 | #include <linux/sched.h> |
1da177e4 LT |
17 | #include <linux/string.h> |
18 | #include <linux/major.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/init.h> | |
d81ed103 | 21 | #include <linux/device.h> |
fe9cd962 | 22 | #include <linux/uaccess.h> |
1da177e4 LT |
23 | #include <linux/bitops.h> |
24 | #include <linux/devpts_fs.h> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
d739e65b | 26 | #include <linux/mutex.h> |
1da177e4 | 27 | |
fe9cd962 | 28 | |
1da177e4 | 29 | #ifdef CONFIG_UNIX98_PTYS |
da2bdf9a | 30 | static struct tty_driver *ptm_driver; |
1da177e4 | 31 | static struct tty_driver *pts_driver; |
d739e65b | 32 | static DEFINE_MUTEX(devpts_mutex); |
1da177e4 LT |
33 | #endif |
34 | ||
fe9cd962 | 35 | static void pty_close(struct tty_struct *tty, struct file *filp) |
1da177e4 | 36 | { |
fe9cd962 AC |
37 | BUG_ON(!tty); |
38 | if (tty->driver->subtype == PTY_TYPE_MASTER) | |
39 | WARN_ON(tty->count > 1); | |
40 | else { | |
1da177e4 LT |
41 | if (tty->count > 2) |
42 | return; | |
43 | } | |
44 | wake_up_interruptible(&tty->read_wait); | |
45 | wake_up_interruptible(&tty->write_wait); | |
46 | tty->packet = 0; | |
89c8d91e | 47 | /* Review - krefs on tty_link ?? */ |
1da177e4 LT |
48 | if (!tty->link) |
49 | return; | |
50 | tty->link->packet = 0; | |
51 | set_bit(TTY_OTHER_CLOSED, &tty->link->flags); | |
52 | wake_up_interruptible(&tty->link->read_wait); | |
53 | wake_up_interruptible(&tty->link->write_wait); | |
54 | if (tty->driver->subtype == PTY_TYPE_MASTER) { | |
55 | set_bit(TTY_OTHER_CLOSED, &tty->flags); | |
ce1000dd | 56 | #ifdef CONFIG_UNIX98_PTYS |
d739e65b AC |
57 | if (tty->driver == ptm_driver) { |
58 | mutex_lock(&devpts_mutex); | |
f11afb61 | 59 | devpts_pty_kill(tty->link->driver_data); |
d739e65b AC |
60 | mutex_unlock(&devpts_mutex); |
61 | } | |
ce1000dd | 62 | #endif |
89c8d91e | 63 | tty_unlock(tty); |
11dbf203 | 64 | tty_vhangup(tty->link); |
89c8d91e | 65 | tty_lock(tty); |
1da177e4 LT |
66 | } |
67 | } | |
68 | ||
69 | /* | |
70 | * The unthrottle routine is called by the line discipline to signal | |
71 | * that it can receive more characters. For PTY's, the TTY_THROTTLED | |
72 | * flag is always set, to force the line discipline to always call the | |
fe9cd962 | 73 | * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE |
1da177e4 LT |
74 | * characters in the queue. This is necessary since each time this |
75 | * happens, we need to wake up any sleeping processes that could be | |
76 | * (1) trying to send data to the pty, or (2) waiting in wait_until_sent() | |
77 | * for the pty buffer to be drained. | |
78 | */ | |
fe9cd962 | 79 | static void pty_unthrottle(struct tty_struct *tty) |
1da177e4 | 80 | { |
d945cb9c | 81 | tty_wakeup(tty->link); |
1da177e4 LT |
82 | set_bit(TTY_THROTTLED, &tty->flags); |
83 | } | |
84 | ||
d945cb9c AC |
85 | /** |
86 | * pty_space - report space left for writing | |
87 | * @to: tty we are writing into | |
1da177e4 | 88 | * |
d945cb9c AC |
89 | * The tty buffers allow 64K but we sneak a peak and clip at 8K this |
90 | * allows a lot of overspill room for echo and other fun messes to | |
91 | * be handled properly | |
92 | */ | |
93 | ||
94 | static int pty_space(struct tty_struct *to) | |
95 | { | |
ecbbfd44 | 96 | int n = 8192 - to->port->buf.memory_used; |
d945cb9c AC |
97 | if (n < 0) |
98 | return 0; | |
99 | return n; | |
100 | } | |
101 | ||
102 | /** | |
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 | |
762faaed | 107 | * |
d945cb9c AC |
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. | |
1da177e4 | 112 | */ |
d945cb9c | 113 | |
ac89a917 | 114 | static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c) |
1da177e4 LT |
115 | { |
116 | struct tty_struct *to = tty->link; | |
1da177e4 | 117 | |
d945cb9c | 118 | if (tty->stopped) |
1da177e4 | 119 | return 0; |
d945cb9c | 120 | |
d945cb9c AC |
121 | if (c > 0) { |
122 | /* Stuff the data into the input queue of the other end */ | |
123 | c = tty_insert_flip_string(to, buf, c); | |
124 | /* And shovel */ | |
202c4675 LT |
125 | if (c) { |
126 | tty_flip_buffer_push(to); | |
127 | tty_wakeup(tty); | |
128 | } | |
762faaed | 129 | } |
1da177e4 LT |
130 | return c; |
131 | } | |
132 | ||
d945cb9c AC |
133 | /** |
134 | * pty_write_room - write space | |
135 | * @tty: tty we are writing from | |
136 | * | |
137 | * Report how many bytes the ldisc can send into the queue for | |
138 | * the other device. | |
139 | */ | |
140 | ||
1da177e4 LT |
141 | static int pty_write_room(struct tty_struct *tty) |
142 | { | |
85dfd81d LT |
143 | if (tty->stopped) |
144 | return 0; | |
d945cb9c | 145 | return pty_space(tty->link); |
1da177e4 LT |
146 | } |
147 | ||
d945cb9c AC |
148 | /** |
149 | * pty_chars_in_buffer - characters currently in our tx queue | |
150 | * @tty: our tty | |
fe9cd962 | 151 | * |
d945cb9c AC |
152 | * Report how much we have in the transmit queue. As everything is |
153 | * instantly at the other end this is easy to implement. | |
1da177e4 | 154 | */ |
d945cb9c | 155 | |
1da177e4 LT |
156 | static int pty_chars_in_buffer(struct tty_struct *tty) |
157 | { | |
d945cb9c | 158 | return 0; |
1da177e4 LT |
159 | } |
160 | ||
161 | /* Set the lock flag on a pty */ | |
fe9cd962 | 162 | static int pty_set_lock(struct tty_struct *tty, int __user *arg) |
1da177e4 LT |
163 | { |
164 | int val; | |
fe9cd962 | 165 | if (get_user(val, arg)) |
1da177e4 LT |
166 | return -EFAULT; |
167 | if (val) | |
168 | set_bit(TTY_PTY_LOCK, &tty->flags); | |
169 | else | |
170 | clear_bit(TTY_PTY_LOCK, &tty->flags); | |
171 | return 0; | |
172 | } | |
173 | ||
84fd7bdf CG |
174 | static int pty_get_lock(struct tty_struct *tty, int __user *arg) |
175 | { | |
176 | int locked = test_bit(TTY_PTY_LOCK, &tty->flags); | |
177 | return put_user(locked, arg); | |
178 | } | |
179 | ||
06026d91 CG |
180 | /* Set the packet mode on a pty */ |
181 | static int pty_set_pktmode(struct tty_struct *tty, int __user *arg) | |
182 | { | |
183 | unsigned long flags; | |
184 | int pktmode; | |
185 | ||
186 | if (get_user(pktmode, arg)) | |
187 | return -EFAULT; | |
188 | ||
189 | spin_lock_irqsave(&tty->ctrl_lock, flags); | |
190 | if (pktmode) { | |
191 | if (!tty->packet) { | |
192 | tty->packet = 1; | |
193 | tty->link->ctrl_status = 0; | |
194 | } | |
195 | } else | |
196 | tty->packet = 0; | |
197 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
84fd7bdf CG |
202 | /* Get the packet mode of a pty */ |
203 | static int pty_get_pktmode(struct tty_struct *tty, int __user *arg) | |
204 | { | |
205 | int pktmode = tty->packet; | |
206 | return put_user(pktmode, arg); | |
207 | } | |
208 | ||
26df6d13 | 209 | /* Send a signal to the slave */ |
210 | static int pty_signal(struct tty_struct *tty, int sig) | |
211 | { | |
212 | unsigned long flags; | |
213 | struct pid *pgrp; | |
214 | ||
215 | if (tty->link) { | |
216 | spin_lock_irqsave(&tty->link->ctrl_lock, flags); | |
217 | pgrp = get_pid(tty->link->pgrp); | |
218 | spin_unlock_irqrestore(&tty->link->ctrl_lock, flags); | |
219 | ||
220 | kill_pgrp(pgrp, sig, 1); | |
221 | put_pid(pgrp); | |
222 | } | |
223 | return 0; | |
224 | } | |
225 | ||
1da177e4 LT |
226 | static void pty_flush_buffer(struct tty_struct *tty) |
227 | { | |
228 | struct tty_struct *to = tty->link; | |
04f378b1 | 229 | unsigned long flags; |
fe9cd962 | 230 | |
1da177e4 LT |
231 | if (!to) |
232 | return; | |
d945cb9c | 233 | /* tty_buffer_flush(to); FIXME */ |
1da177e4 | 234 | if (to->packet) { |
04f378b1 | 235 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
1da177e4 LT |
236 | tty->ctrl_status |= TIOCPKT_FLUSHWRITE; |
237 | wake_up_interruptible(&to->read_wait); | |
04f378b1 | 238 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
1da177e4 LT |
239 | } |
240 | } | |
241 | ||
fe9cd962 | 242 | static int pty_open(struct tty_struct *tty, struct file *filp) |
1da177e4 LT |
243 | { |
244 | int retval = -ENODEV; | |
245 | ||
246 | if (!tty || !tty->link) | |
247 | goto out; | |
248 | ||
249 | retval = -EIO; | |
250 | if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) | |
251 | goto out; | |
252 | if (test_bit(TTY_PTY_LOCK, &tty->link->flags)) | |
253 | goto out; | |
254 | if (tty->link->count != 1) | |
255 | goto out; | |
256 | ||
257 | clear_bit(TTY_OTHER_CLOSED, &tty->link->flags); | |
258 | set_bit(TTY_THROTTLED, &tty->flags); | |
1da177e4 LT |
259 | retval = 0; |
260 | out: | |
261 | return retval; | |
262 | } | |
263 | ||
fe9cd962 AC |
264 | static void pty_set_termios(struct tty_struct *tty, |
265 | struct ktermios *old_termios) | |
1da177e4 | 266 | { |
adc8d746 AC |
267 | tty->termios.c_cflag &= ~(CSIZE | PARENB); |
268 | tty->termios.c_cflag |= (CS8 | CREAD); | |
1da177e4 LT |
269 | } |
270 | ||
fc6f6238 AC |
271 | /** |
272 | * pty_do_resize - resize event | |
273 | * @tty: tty being resized | |
c774bda2 | 274 | * @ws: window size being set. |
fc6f6238 | 275 | * |
3ad2f3fb | 276 | * Update the termios variables and send the necessary signals to |
fc6f6238 AC |
277 | * peform a terminal resize correctly |
278 | */ | |
279 | ||
159a8e92 | 280 | static int pty_resize(struct tty_struct *tty, struct winsize *ws) |
fc6f6238 AC |
281 | { |
282 | struct pid *pgrp, *rpgrp; | |
283 | unsigned long flags; | |
284 | struct tty_struct *pty = tty->link; | |
285 | ||
286 | /* For a PTY we need to lock the tty side */ | |
287 | mutex_lock(&tty->termios_mutex); | |
288 | if (!memcmp(ws, &tty->winsize, sizeof(*ws))) | |
289 | goto done; | |
290 | ||
291 | /* Get the PID values and reference them so we can | |
292 | avoid holding the tty ctrl lock while sending signals. | |
293 | We need to lock these individually however. */ | |
294 | ||
295 | spin_lock_irqsave(&tty->ctrl_lock, flags); | |
296 | pgrp = get_pid(tty->pgrp); | |
297 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); | |
298 | ||
299 | spin_lock_irqsave(&pty->ctrl_lock, flags); | |
300 | rpgrp = get_pid(pty->pgrp); | |
301 | spin_unlock_irqrestore(&pty->ctrl_lock, flags); | |
302 | ||
303 | if (pgrp) | |
304 | kill_pgrp(pgrp, SIGWINCH, 1); | |
305 | if (rpgrp != pgrp && rpgrp) | |
306 | kill_pgrp(rpgrp, SIGWINCH, 1); | |
307 | ||
308 | put_pid(pgrp); | |
309 | put_pid(rpgrp); | |
310 | ||
311 | tty->winsize = *ws; | |
312 | pty->winsize = *ws; /* Never used so will go away soon */ | |
313 | done: | |
314 | mutex_unlock(&tty->termios_mutex); | |
315 | return 0; | |
316 | } | |
317 | ||
d155255a AC |
318 | /** |
319 | * pty_common_install - set up the pty pair | |
320 | * @driver: the pty driver | |
321 | * @tty: the tty being instantiated | |
322 | * @bool: legacy, true if this is BSD style | |
323 | * | |
324 | * Perform the initial set up for the tty/pty pair. Called from the | |
325 | * tty layer when the port is first opened. | |
326 | * | |
327 | * Locking: the caller must hold the tty_mutex | |
328 | */ | |
5d249bc6 JS |
329 | static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty, |
330 | bool legacy) | |
bf970ee4 AC |
331 | { |
332 | struct tty_struct *o_tty; | |
d03702a2 | 333 | struct tty_port *ports[2]; |
bf970ee4 | 334 | int idx = tty->index; |
5d249bc6 | 335 | int retval = -ENOMEM; |
bf970ee4 AC |
336 | |
337 | o_tty = alloc_tty_struct(); | |
6f9ea7ad JS |
338 | if (!o_tty) |
339 | goto err; | |
d03702a2 JS |
340 | ports[0] = kmalloc(sizeof **ports, GFP_KERNEL); |
341 | ports[1] = kmalloc(sizeof **ports, GFP_KERNEL); | |
6f9ea7ad | 342 | if (!ports[0] || !ports[1]) |
d03702a2 | 343 | goto err_free_tty; |
bf970ee4 AC |
344 | if (!try_module_get(driver->other->owner)) { |
345 | /* This cannot in fact currently happen */ | |
8a1b8d70 | 346 | goto err_free_tty; |
bf970ee4 AC |
347 | } |
348 | initialize_tty_struct(o_tty, driver->other, idx); | |
349 | ||
5d249bc6 JS |
350 | if (legacy) { |
351 | /* We always use new tty termios data so we can do this | |
352 | the easy way .. */ | |
353 | retval = tty_init_termios(tty); | |
354 | if (retval) | |
355 | goto err_deinit_tty; | |
356 | ||
357 | retval = tty_init_termios(o_tty); | |
358 | if (retval) | |
359 | goto err_free_termios; | |
360 | ||
361 | driver->other->ttys[idx] = o_tty; | |
362 | driver->ttys[idx] = tty; | |
363 | } else { | |
adc8d746 AC |
364 | memset(&tty->termios_locked, 0, sizeof(tty->termios_locked)); |
365 | tty->termios = driver->init_termios; | |
366 | memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked)); | |
367 | o_tty->termios = driver->other->init_termios; | |
5d249bc6 | 368 | } |
fe9cd962 | 369 | |
bf970ee4 AC |
370 | /* |
371 | * Everything allocated ... set up the o_tty structure. | |
372 | */ | |
bf970ee4 AC |
373 | tty_driver_kref_get(driver->other); |
374 | if (driver->subtype == PTY_TYPE_MASTER) | |
375 | o_tty->count++; | |
376 | /* Establish the links in both directions */ | |
377 | tty->link = o_tty; | |
378 | o_tty->link = tty; | |
d03702a2 JS |
379 | tty_port_init(ports[0]); |
380 | tty_port_init(ports[1]); | |
381 | o_tty->port = ports[0]; | |
382 | tty->port = ports[1]; | |
967fab69 | 383 | o_tty->port->itty = o_tty; |
bf970ee4 AC |
384 | |
385 | tty_driver_kref_get(driver); | |
386 | tty->count++; | |
bf970ee4 | 387 | return 0; |
8a1b8d70 | 388 | err_free_termios: |
5d249bc6 JS |
389 | if (legacy) |
390 | tty_free_termios(tty); | |
a9dccddb JS |
391 | err_deinit_tty: |
392 | deinitialize_tty_struct(o_tty); | |
bf970ee4 | 393 | module_put(o_tty->driver->owner); |
8a1b8d70 | 394 | err_free_tty: |
d03702a2 JS |
395 | kfree(ports[0]); |
396 | kfree(ports[1]); | |
bf970ee4 | 397 | free_tty_struct(o_tty); |
6f9ea7ad | 398 | err: |
8a1b8d70 | 399 | return retval; |
bf970ee4 AC |
400 | } |
401 | ||
fa2ecfc5 JS |
402 | /* this is called once with whichever end is closed last */ |
403 | static void pty_unix98_shutdown(struct tty_struct *tty) | |
404 | { | |
405 | devpts_kill_index(tty->driver_data, tty->index); | |
406 | } | |
407 | ||
d03702a2 JS |
408 | static void pty_cleanup(struct tty_struct *tty) |
409 | { | |
967fab69 | 410 | tty->port->itty = NULL; |
81c79838 | 411 | tty_port_put(tty->port); |
d03702a2 JS |
412 | } |
413 | ||
5d249bc6 JS |
414 | /* Traditional BSD devices */ |
415 | #ifdef CONFIG_LEGACY_PTYS | |
416 | ||
417 | static int pty_install(struct tty_driver *driver, struct tty_struct *tty) | |
418 | { | |
419 | return pty_common_install(driver, tty, true); | |
420 | } | |
421 | ||
d155255a AC |
422 | static void pty_remove(struct tty_driver *driver, struct tty_struct *tty) |
423 | { | |
424 | struct tty_struct *pair = tty->link; | |
425 | driver->ttys[tty->index] = NULL; | |
426 | if (pair) | |
427 | pair->driver->ttys[pair->index] = NULL; | |
428 | } | |
429 | ||
6caa76b7 | 430 | static int pty_bsd_ioctl(struct tty_struct *tty, |
1da177e4 LT |
431 | unsigned int cmd, unsigned long arg) |
432 | { | |
433 | switch (cmd) { | |
434 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
435 | return pty_set_lock(tty, (int __user *) arg); | |
84fd7bdf CG |
436 | case TIOCGPTLCK: /* Get PT Lock status */ |
437 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
438 | case TIOCPKT: /* Set PT packet mode */ |
439 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
440 | case TIOCGPKT: /* Get PT packet mode */ |
441 | return pty_get_pktmode(tty, (int __user *)arg); | |
26df6d13 | 442 | case TIOCSIG: /* Send signal to other side of pty */ |
443 | return pty_signal(tty, (int) arg); | |
ded2f295 JS |
444 | case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */ |
445 | return -EINVAL; | |
1da177e4 LT |
446 | } |
447 | return -ENOIOCTLCMD; | |
448 | } | |
449 | ||
dc8c8587 KS |
450 | static int legacy_count = CONFIG_LEGACY_PTY_COUNT; |
451 | module_param(legacy_count, int, 0); | |
452 | ||
342a5971 LT |
453 | /* |
454 | * The master side of a pty can do TIOCSPTLCK and thus | |
455 | * has pty_bsd_ioctl. | |
456 | */ | |
457 | static const struct tty_operations master_pty_ops_bsd = { | |
458 | .install = pty_install, | |
3e8e88ca AC |
459 | .open = pty_open, |
460 | .close = pty_close, | |
461 | .write = pty_write, | |
462 | .write_room = pty_write_room, | |
463 | .flush_buffer = pty_flush_buffer, | |
464 | .chars_in_buffer = pty_chars_in_buffer, | |
465 | .unthrottle = pty_unthrottle, | |
466 | .set_termios = pty_set_termios, | |
467 | .ioctl = pty_bsd_ioctl, | |
d03702a2 | 468 | .cleanup = pty_cleanup, |
d155255a AC |
469 | .resize = pty_resize, |
470 | .remove = pty_remove | |
3e8e88ca AC |
471 | }; |
472 | ||
342a5971 LT |
473 | static const struct tty_operations slave_pty_ops_bsd = { |
474 | .install = pty_install, | |
475 | .open = pty_open, | |
476 | .close = pty_close, | |
477 | .write = pty_write, | |
478 | .write_room = pty_write_room, | |
479 | .flush_buffer = pty_flush_buffer, | |
480 | .chars_in_buffer = pty_chars_in_buffer, | |
481 | .unthrottle = pty_unthrottle, | |
482 | .set_termios = pty_set_termios, | |
d03702a2 | 483 | .cleanup = pty_cleanup, |
d155255a AC |
484 | .resize = pty_resize, |
485 | .remove = pty_remove | |
342a5971 LT |
486 | }; |
487 | ||
1da177e4 LT |
488 | static void __init legacy_pty_init(void) |
489 | { | |
342a5971 LT |
490 | struct tty_driver *pty_driver, *pty_slave_driver; |
491 | ||
dc8c8587 KS |
492 | if (legacy_count <= 0) |
493 | return; | |
1da177e4 | 494 | |
21aca2fa JS |
495 | pty_driver = tty_alloc_driver(legacy_count, |
496 | TTY_DRIVER_RESET_TERMIOS | | |
497 | TTY_DRIVER_REAL_RAW | | |
498 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 499 | if (IS_ERR(pty_driver)) |
1da177e4 LT |
500 | panic("Couldn't allocate pty driver"); |
501 | ||
21aca2fa JS |
502 | pty_slave_driver = tty_alloc_driver(legacy_count, |
503 | TTY_DRIVER_RESET_TERMIOS | | |
504 | TTY_DRIVER_REAL_RAW | | |
505 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 506 | if (IS_ERR(pty_slave_driver)) |
1da177e4 LT |
507 | panic("Couldn't allocate pty slave driver"); |
508 | ||
1da177e4 LT |
509 | pty_driver->driver_name = "pty_master"; |
510 | pty_driver->name = "pty"; | |
1da177e4 LT |
511 | pty_driver->major = PTY_MASTER_MAJOR; |
512 | pty_driver->minor_start = 0; | |
513 | pty_driver->type = TTY_DRIVER_TYPE_PTY; | |
514 | pty_driver->subtype = PTY_TYPE_MASTER; | |
515 | pty_driver->init_termios = tty_std_termios; | |
516 | pty_driver->init_termios.c_iflag = 0; | |
517 | pty_driver->init_termios.c_oflag = 0; | |
518 | pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
519 | pty_driver->init_termios.c_lflag = 0; | |
606d099c AC |
520 | pty_driver->init_termios.c_ispeed = 38400; |
521 | pty_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 522 | pty_driver->other = pty_slave_driver; |
342a5971 | 523 | tty_set_operations(pty_driver, &master_pty_ops_bsd); |
1da177e4 | 524 | |
1da177e4 LT |
525 | pty_slave_driver->driver_name = "pty_slave"; |
526 | pty_slave_driver->name = "ttyp"; | |
1da177e4 LT |
527 | pty_slave_driver->major = PTY_SLAVE_MAJOR; |
528 | pty_slave_driver->minor_start = 0; | |
529 | pty_slave_driver->type = TTY_DRIVER_TYPE_PTY; | |
530 | pty_slave_driver->subtype = PTY_TYPE_SLAVE; | |
531 | pty_slave_driver->init_termios = tty_std_termios; | |
532 | pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
533 | pty_slave_driver->init_termios.c_ispeed = 38400; |
534 | pty_slave_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 535 | pty_slave_driver->other = pty_driver; |
342a5971 | 536 | tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd); |
1da177e4 LT |
537 | |
538 | if (tty_register_driver(pty_driver)) | |
539 | panic("Couldn't register pty driver"); | |
540 | if (tty_register_driver(pty_slave_driver)) | |
541 | panic("Couldn't register pty slave driver"); | |
542 | } | |
543 | #else | |
544 | static inline void legacy_pty_init(void) { } | |
545 | #endif | |
546 | ||
547 | /* Unix98 devices */ | |
548 | #ifdef CONFIG_UNIX98_PTYS | |
1da177e4 | 549 | |
d81ed103 AC |
550 | static struct cdev ptmx_cdev; |
551 | ||
6caa76b7 | 552 | static int pty_unix98_ioctl(struct tty_struct *tty, |
1da177e4 LT |
553 | unsigned int cmd, unsigned long arg) |
554 | { | |
555 | switch (cmd) { | |
556 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
557 | return pty_set_lock(tty, (int __user *)arg); | |
84fd7bdf CG |
558 | case TIOCGPTLCK: /* Get PT Lock status */ |
559 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
560 | case TIOCPKT: /* Set PT packet mode */ |
561 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
562 | case TIOCGPKT: /* Get PT packet mode */ |
563 | return pty_get_pktmode(tty, (int __user *)arg); | |
1da177e4 LT |
564 | case TIOCGPTN: /* Get PT Number */ |
565 | return put_user(tty->index, (unsigned int __user *)arg); | |
26df6d13 | 566 | case TIOCSIG: /* Send signal to other side of pty */ |
567 | return pty_signal(tty, (int) arg); | |
1da177e4 LT |
568 | } |
569 | ||
570 | return -ENOIOCTLCMD; | |
571 | } | |
572 | ||
99f1fe18 AC |
573 | /** |
574 | * ptm_unix98_lookup - find a pty master | |
575 | * @driver: ptm driver | |
576 | * @idx: tty index | |
577 | * | |
578 | * Look up a pty master device. Called under the tty_mutex for now. | |
579 | * This provides our locking. | |
580 | */ | |
581 | ||
15f1a633 SB |
582 | static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, |
583 | struct inode *ptm_inode, int idx) | |
99f1fe18 | 584 | { |
593a27c4 KK |
585 | /* Master must be open via /dev/ptmx */ |
586 | return ERR_PTR(-EIO); | |
99f1fe18 AC |
587 | } |
588 | ||
589 | /** | |
590 | * pts_unix98_lookup - find a pty slave | |
591 | * @driver: pts driver | |
592 | * @idx: tty index | |
593 | * | |
594 | * Look up a pty master device. Called under the tty_mutex for now. | |
d739e65b | 595 | * This provides our locking for the tty pointer. |
99f1fe18 AC |
596 | */ |
597 | ||
15f1a633 SB |
598 | static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver, |
599 | struct inode *pts_inode, int idx) | |
99f1fe18 | 600 | { |
d739e65b AC |
601 | struct tty_struct *tty; |
602 | ||
603 | mutex_lock(&devpts_mutex); | |
8fcbaa2b | 604 | tty = devpts_get_priv(pts_inode); |
d739e65b | 605 | mutex_unlock(&devpts_mutex); |
99f1fe18 AC |
606 | /* Master must be open before slave */ |
607 | if (!tty) | |
608 | return ERR_PTR(-EIO); | |
609 | return tty; | |
610 | } | |
611 | ||
8b0a88d5 AC |
612 | /* We have no need to install and remove our tty objects as devpts does all |
613 | the work for us */ | |
614 | ||
bf970ee4 | 615 | static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty) |
8b0a88d5 | 616 | { |
5d249bc6 | 617 | return pty_common_install(driver, tty, false); |
8b0a88d5 AC |
618 | } |
619 | ||
7171604a | 620 | static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty) |
8b0a88d5 AC |
621 | { |
622 | } | |
623 | ||
feebed65 | 624 | static const struct tty_operations ptm_unix98_ops = { |
99f1fe18 | 625 | .lookup = ptm_unix98_lookup, |
bf970ee4 | 626 | .install = pty_unix98_install, |
7171604a | 627 | .remove = pty_unix98_remove, |
3e8e88ca AC |
628 | .open = pty_open, |
629 | .close = pty_close, | |
630 | .write = pty_write, | |
631 | .write_room = pty_write_room, | |
632 | .flush_buffer = pty_flush_buffer, | |
633 | .chars_in_buffer = pty_chars_in_buffer, | |
634 | .unthrottle = pty_unthrottle, | |
635 | .set_termios = pty_set_termios, | |
feebed65 | 636 | .ioctl = pty_unix98_ioctl, |
36b3c070 | 637 | .resize = pty_resize, |
fa2ecfc5 | 638 | .shutdown = pty_unix98_shutdown, |
36b3c070 | 639 | .cleanup = pty_cleanup |
3e8e88ca AC |
640 | }; |
641 | ||
99f1fe18 AC |
642 | static const struct tty_operations pty_unix98_ops = { |
643 | .lookup = pts_unix98_lookup, | |
bf970ee4 | 644 | .install = pty_unix98_install, |
7171604a | 645 | .remove = pty_unix98_remove, |
99f1fe18 AC |
646 | .open = pty_open, |
647 | .close = pty_close, | |
648 | .write = pty_write, | |
649 | .write_room = pty_write_room, | |
650 | .flush_buffer = pty_flush_buffer, | |
651 | .chars_in_buffer = pty_chars_in_buffer, | |
652 | .unthrottle = pty_unthrottle, | |
653 | .set_termios = pty_set_termios, | |
fa2ecfc5 | 654 | .shutdown = pty_unix98_shutdown, |
d03702a2 | 655 | .cleanup = pty_cleanup, |
99f1fe18 | 656 | }; |
d81ed103 AC |
657 | |
658 | /** | |
659 | * ptmx_open - open a unix 98 pty master | |
660 | * @inode: inode of device file | |
661 | * @filp: file pointer to tty | |
662 | * | |
663 | * Allocate a unix98 pty master device from the ptmx driver. | |
664 | * | |
665 | * Locking: tty_mutex protects the init_dev work. tty->count should | |
666 | * protect the rest. | |
667 | * allocated_ptys_lock handles the list of free pty numbers | |
668 | */ | |
669 | ||
64ba3dc3 | 670 | static int ptmx_open(struct inode *inode, struct file *filp) |
d81ed103 AC |
671 | { |
672 | struct tty_struct *tty; | |
162b97cf | 673 | struct inode *slave_inode; |
d81ed103 AC |
674 | int retval; |
675 | int index; | |
676 | ||
677 | nonseekable_open(inode, filp); | |
678 | ||
fa90e1c9 JS |
679 | retval = tty_alloc_file(filp); |
680 | if (retval) | |
681 | return retval; | |
682 | ||
d81ed103 | 683 | /* find a device that is not in use. */ |
89c8d91e | 684 | mutex_lock(&devpts_mutex); |
15f1a633 | 685 | index = devpts_new_index(inode); |
fa90e1c9 JS |
686 | if (index < 0) { |
687 | retval = index; | |
05fb79e4 | 688 | mutex_unlock(&devpts_mutex); |
fa90e1c9 JS |
689 | goto err_file; |
690 | } | |
d81ed103 | 691 | |
89c8d91e AC |
692 | mutex_unlock(&devpts_mutex); |
693 | ||
d81ed103 | 694 | mutex_lock(&tty_mutex); |
593a27c4 | 695 | tty = tty_init_dev(ptm_driver, index); |
d81ed103 | 696 | |
73ec06fc AC |
697 | if (IS_ERR(tty)) { |
698 | retval = PTR_ERR(tty); | |
d81ed103 | 699 | goto out; |
73ec06fc | 700 | } |
d81ed103 | 701 | |
89c8d91e AC |
702 | /* The tty returned here is locked so we can safely |
703 | drop the mutex */ | |
704 | mutex_unlock(&tty_mutex); | |
705 | ||
d81ed103 | 706 | set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ |
ee2ffa0d | 707 | |
fa90e1c9 | 708 | tty_add_file(tty, filp); |
d81ed103 | 709 | |
f11afb61 JS |
710 | slave_inode = devpts_pty_new(inode, |
711 | MKDEV(UNIX98_PTY_SLAVE_MAJOR, index), index, | |
712 | tty->link); | |
162b97cf JS |
713 | if (IS_ERR(slave_inode)) { |
714 | retval = PTR_ERR(slave_inode); | |
1177c0ef | 715 | goto err_release; |
162b97cf | 716 | } |
d81ed103 AC |
717 | |
718 | retval = ptm_driver->ops->open(tty, filp); | |
64ba3dc3 | 719 | if (retval) |
1177c0ef JS |
720 | goto err_release; |
721 | ||
89c8d91e | 722 | tty_unlock(tty); |
fa2ecfc5 | 723 | tty->driver_data = inode; |
f11afb61 | 724 | tty->link->driver_data = slave_inode; |
1177c0ef JS |
725 | return 0; |
726 | err_release: | |
89c8d91e | 727 | tty_unlock(tty); |
eeb89d91 | 728 | tty_release(inode, filp); |
d81ed103 AC |
729 | return retval; |
730 | out: | |
89c8d91e | 731 | mutex_unlock(&tty_mutex); |
d3bda529 | 732 | devpts_kill_index(inode, index); |
fa90e1c9 JS |
733 | err_file: |
734 | tty_free_file(filp); | |
64ba3dc3 | 735 | return retval; |
d81ed103 AC |
736 | } |
737 | ||
738 | static struct file_operations ptmx_fops; | |
739 | ||
1da177e4 LT |
740 | static void __init unix98_pty_init(void) |
741 | { | |
21aca2fa JS |
742 | ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
743 | TTY_DRIVER_RESET_TERMIOS | | |
744 | TTY_DRIVER_REAL_RAW | | |
745 | TTY_DRIVER_DYNAMIC_DEV | | |
746 | TTY_DRIVER_DEVPTS_MEM | | |
747 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 748 | if (IS_ERR(ptm_driver)) |
1da177e4 | 749 | panic("Couldn't allocate Unix98 ptm driver"); |
21aca2fa JS |
750 | pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
751 | TTY_DRIVER_RESET_TERMIOS | | |
752 | TTY_DRIVER_REAL_RAW | | |
753 | TTY_DRIVER_DYNAMIC_DEV | | |
754 | TTY_DRIVER_DEVPTS_MEM | | |
755 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 756 | if (IS_ERR(pts_driver)) |
1da177e4 LT |
757 | panic("Couldn't allocate Unix98 pts driver"); |
758 | ||
1da177e4 LT |
759 | ptm_driver->driver_name = "pty_master"; |
760 | ptm_driver->name = "ptm"; | |
761 | ptm_driver->major = UNIX98_PTY_MASTER_MAJOR; | |
762 | ptm_driver->minor_start = 0; | |
763 | ptm_driver->type = TTY_DRIVER_TYPE_PTY; | |
764 | ptm_driver->subtype = PTY_TYPE_MASTER; | |
765 | ptm_driver->init_termios = tty_std_termios; | |
766 | ptm_driver->init_termios.c_iflag = 0; | |
767 | ptm_driver->init_termios.c_oflag = 0; | |
768 | ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
769 | ptm_driver->init_termios.c_lflag = 0; | |
606d099c AC |
770 | ptm_driver->init_termios.c_ispeed = 38400; |
771 | ptm_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 772 | ptm_driver->other = pts_driver; |
feebed65 | 773 | tty_set_operations(ptm_driver, &ptm_unix98_ops); |
1da177e4 | 774 | |
1da177e4 LT |
775 | pts_driver->driver_name = "pty_slave"; |
776 | pts_driver->name = "pts"; | |
777 | pts_driver->major = UNIX98_PTY_SLAVE_MAJOR; | |
778 | pts_driver->minor_start = 0; | |
779 | pts_driver->type = TTY_DRIVER_TYPE_PTY; | |
780 | pts_driver->subtype = PTY_TYPE_SLAVE; | |
781 | pts_driver->init_termios = tty_std_termios; | |
782 | pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
783 | pts_driver->init_termios.c_ispeed = 38400; |
784 | pts_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 785 | pts_driver->other = ptm_driver; |
99f1fe18 | 786 | tty_set_operations(pts_driver, &pty_unix98_ops); |
fe9cd962 | 787 | |
1da177e4 LT |
788 | if (tty_register_driver(ptm_driver)) |
789 | panic("Couldn't register Unix98 ptm driver"); | |
790 | if (tty_register_driver(pts_driver)) | |
791 | panic("Couldn't register Unix98 pts driver"); | |
792 | ||
d81ed103 AC |
793 | /* Now create the /dev/ptmx special device */ |
794 | tty_default_fops(&ptmx_fops); | |
795 | ptmx_fops.open = ptmx_open; | |
796 | ||
797 | cdev_init(&ptmx_cdev, &ptmx_fops); | |
798 | if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) || | |
799 | register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0) | |
800 | panic("Couldn't register /dev/ptmx driver\n"); | |
801 | device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); | |
1da177e4 | 802 | } |
d81ed103 | 803 | |
1da177e4 LT |
804 | #else |
805 | static inline void unix98_pty_init(void) { } | |
806 | #endif | |
807 | ||
808 | static int __init pty_init(void) | |
809 | { | |
810 | legacy_pty_init(); | |
811 | unix98_pty_init(); | |
812 | return 0; | |
813 | } | |
814 | module_init(pty_init); |