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> |
01adc807 | 27 | #include <linux/poll.h> |
1da177e4 | 28 | |
fe9cd962 | 29 | |
1da177e4 | 30 | #ifdef CONFIG_UNIX98_PTYS |
da2bdf9a | 31 | static struct tty_driver *ptm_driver; |
1da177e4 | 32 | static struct tty_driver *pts_driver; |
d739e65b | 33 | static DEFINE_MUTEX(devpts_mutex); |
1da177e4 LT |
34 | #endif |
35 | ||
fe9cd962 | 36 | static void pty_close(struct tty_struct *tty, struct file *filp) |
1da177e4 | 37 | { |
fe9cd962 AC |
38 | BUG_ON(!tty); |
39 | if (tty->driver->subtype == PTY_TYPE_MASTER) | |
40 | WARN_ON(tty->count > 1); | |
41 | else { | |
69939035 PH |
42 | if (test_bit(TTY_IO_ERROR, &tty->flags)) |
43 | return; | |
1da177e4 LT |
44 | if (tty->count > 2) |
45 | return; | |
46 | } | |
69939035 | 47 | set_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
48 | wake_up_interruptible(&tty->read_wait); |
49 | wake_up_interruptible(&tty->write_wait); | |
50 | tty->packet = 0; | |
89c8d91e | 51 | /* Review - krefs on tty_link ?? */ |
1da177e4 LT |
52 | if (!tty->link) |
53 | return; | |
1da177e4 LT |
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); | |
ce1000dd | 59 | #ifdef CONFIG_UNIX98_PTYS |
d739e65b | 60 | if (tty->driver == ptm_driver) { |
b9f8033f | 61 | mutex_lock(&devpts_mutex); |
7acf6cd8 PH |
62 | if (tty->link->driver_data) |
63 | devpts_pty_kill(tty->link->driver_data); | |
b9f8033f | 64 | mutex_unlock(&devpts_mutex); |
d739e65b | 65 | } |
ce1000dd | 66 | #endif |
89c8d91e | 67 | tty_unlock(tty); |
11dbf203 | 68 | tty_vhangup(tty->link); |
89c8d91e | 69 | tty_lock(tty); |
1da177e4 LT |
70 | } |
71 | } | |
72 | ||
73 | /* | |
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 | |
fe9cd962 | 77 | * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE |
1da177e4 LT |
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. | |
82 | */ | |
fe9cd962 | 83 | static void pty_unthrottle(struct tty_struct *tty) |
1da177e4 | 84 | { |
d945cb9c | 85 | tty_wakeup(tty->link); |
1da177e4 LT |
86 | set_bit(TTY_THROTTLED, &tty->flags); |
87 | } | |
88 | ||
d945cb9c AC |
89 | /** |
90 | * pty_space - report space left for writing | |
91 | * @to: tty we are writing into | |
1da177e4 | 92 | * |
7bfe0b71 | 93 | * Limit the buffer space used by ptys to 8k. |
d945cb9c AC |
94 | */ |
95 | ||
96 | static int pty_space(struct tty_struct *to) | |
97 | { | |
7bfe0b71 PH |
98 | int n = tty_buffer_space_avail(to->port); |
99 | return min(n, 8192); | |
d945cb9c AC |
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 */ | |
05c7cd39 | 123 | c = tty_insert_flip_string(to->port, buf, c); |
d945cb9c | 124 | /* And shovel */ |
5ede5253 | 125 | if (c) |
2e124b4a | 126 | tty_flip_buffer_push(to->port); |
762faaed | 127 | } |
1da177e4 LT |
128 | return c; |
129 | } | |
130 | ||
d945cb9c AC |
131 | /** |
132 | * pty_write_room - write space | |
133 | * @tty: tty we are writing from | |
134 | * | |
135 | * Report how many bytes the ldisc can send into the queue for | |
136 | * the other device. | |
137 | */ | |
138 | ||
1da177e4 LT |
139 | static int pty_write_room(struct tty_struct *tty) |
140 | { | |
85dfd81d LT |
141 | if (tty->stopped) |
142 | return 0; | |
d945cb9c | 143 | return pty_space(tty->link); |
1da177e4 LT |
144 | } |
145 | ||
d945cb9c AC |
146 | /** |
147 | * pty_chars_in_buffer - characters currently in our tx queue | |
148 | * @tty: our tty | |
fe9cd962 | 149 | * |
d945cb9c AC |
150 | * Report how much we have in the transmit queue. As everything is |
151 | * instantly at the other end this is easy to implement. | |
1da177e4 | 152 | */ |
d945cb9c | 153 | |
1da177e4 LT |
154 | static int pty_chars_in_buffer(struct tty_struct *tty) |
155 | { | |
d945cb9c | 156 | return 0; |
1da177e4 LT |
157 | } |
158 | ||
159 | /* Set the lock flag on a pty */ | |
fe9cd962 | 160 | static int pty_set_lock(struct tty_struct *tty, int __user *arg) |
1da177e4 LT |
161 | { |
162 | int val; | |
fe9cd962 | 163 | if (get_user(val, arg)) |
1da177e4 LT |
164 | return -EFAULT; |
165 | if (val) | |
166 | set_bit(TTY_PTY_LOCK, &tty->flags); | |
167 | else | |
168 | clear_bit(TTY_PTY_LOCK, &tty->flags); | |
169 | return 0; | |
170 | } | |
171 | ||
84fd7bdf CG |
172 | static int pty_get_lock(struct tty_struct *tty, int __user *arg) |
173 | { | |
174 | int locked = test_bit(TTY_PTY_LOCK, &tty->flags); | |
175 | return put_user(locked, arg); | |
176 | } | |
177 | ||
06026d91 CG |
178 | /* Set the packet mode on a pty */ |
179 | static int pty_set_pktmode(struct tty_struct *tty, int __user *arg) | |
180 | { | |
181 | unsigned long flags; | |
182 | int pktmode; | |
183 | ||
184 | if (get_user(pktmode, arg)) | |
185 | return -EFAULT; | |
186 | ||
187 | spin_lock_irqsave(&tty->ctrl_lock, flags); | |
188 | if (pktmode) { | |
189 | if (!tty->packet) { | |
190 | tty->packet = 1; | |
191 | tty->link->ctrl_status = 0; | |
192 | } | |
193 | } else | |
194 | tty->packet = 0; | |
195 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
84fd7bdf CG |
200 | /* Get the packet mode of a pty */ |
201 | static int pty_get_pktmode(struct tty_struct *tty, int __user *arg) | |
202 | { | |
203 | int pktmode = tty->packet; | |
204 | return put_user(pktmode, arg); | |
205 | } | |
206 | ||
26df6d13 | 207 | /* Send a signal to the slave */ |
208 | static int pty_signal(struct tty_struct *tty, int sig) | |
209 | { | |
210 | unsigned long flags; | |
211 | struct pid *pgrp; | |
212 | ||
213 | if (tty->link) { | |
214 | spin_lock_irqsave(&tty->link->ctrl_lock, flags); | |
215 | pgrp = get_pid(tty->link->pgrp); | |
216 | spin_unlock_irqrestore(&tty->link->ctrl_lock, flags); | |
217 | ||
218 | kill_pgrp(pgrp, sig, 1); | |
219 | put_pid(pgrp); | |
220 | } | |
221 | return 0; | |
222 | } | |
223 | ||
1da177e4 LT |
224 | static void pty_flush_buffer(struct tty_struct *tty) |
225 | { | |
226 | struct tty_struct *to = tty->link; | |
04f378b1 | 227 | unsigned long flags; |
fe9cd962 | 228 | |
1da177e4 LT |
229 | if (!to) |
230 | return; | |
d945cb9c | 231 | /* tty_buffer_flush(to); FIXME */ |
1da177e4 | 232 | if (to->packet) { |
04f378b1 | 233 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
1da177e4 LT |
234 | tty->ctrl_status |= TIOCPKT_FLUSHWRITE; |
235 | wake_up_interruptible(&to->read_wait); | |
04f378b1 | 236 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
1da177e4 LT |
237 | } |
238 | } | |
239 | ||
fe9cd962 | 240 | static int pty_open(struct tty_struct *tty, struct file *filp) |
1da177e4 | 241 | { |
1da177e4 | 242 | if (!tty || !tty->link) |
7c61c3d8 | 243 | return -ENODEV; |
69939035 | 244 | |
1da177e4 LT |
245 | if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) |
246 | goto out; | |
247 | if (test_bit(TTY_PTY_LOCK, &tty->link->flags)) | |
248 | goto out; | |
80cace72 | 249 | if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1) |
1da177e4 LT |
250 | goto out; |
251 | ||
69939035 | 252 | clear_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
253 | clear_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
254 | set_bit(TTY_THROTTLED, &tty->flags); | |
7c61c3d8 PH |
255 | return 0; |
256 | ||
1da177e4 | 257 | out: |
7c61c3d8 PH |
258 | set_bit(TTY_IO_ERROR, &tty->flags); |
259 | return -EIO; | |
1da177e4 LT |
260 | } |
261 | ||
fe9cd962 AC |
262 | static void pty_set_termios(struct tty_struct *tty, |
263 | struct ktermios *old_termios) | |
1da177e4 | 264 | { |
adc8d746 AC |
265 | tty->termios.c_cflag &= ~(CSIZE | PARENB); |
266 | tty->termios.c_cflag |= (CS8 | CREAD); | |
1da177e4 LT |
267 | } |
268 | ||
fc6f6238 AC |
269 | /** |
270 | * pty_do_resize - resize event | |
271 | * @tty: tty being resized | |
c774bda2 | 272 | * @ws: window size being set. |
fc6f6238 | 273 | * |
3ad2f3fb | 274 | * Update the termios variables and send the necessary signals to |
fc6f6238 AC |
275 | * peform a terminal resize correctly |
276 | */ | |
277 | ||
159a8e92 | 278 | static int pty_resize(struct tty_struct *tty, struct winsize *ws) |
fc6f6238 AC |
279 | { |
280 | struct pid *pgrp, *rpgrp; | |
281 | unsigned long flags; | |
282 | struct tty_struct *pty = tty->link; | |
283 | ||
284 | /* For a PTY we need to lock the tty side */ | |
dee4a0be | 285 | mutex_lock(&tty->winsize_mutex); |
fc6f6238 AC |
286 | if (!memcmp(ws, &tty->winsize, sizeof(*ws))) |
287 | goto done; | |
288 | ||
289 | /* Get the PID values and reference them so we can | |
290 | avoid holding the tty ctrl lock while sending signals. | |
291 | We need to lock these individually however. */ | |
292 | ||
293 | spin_lock_irqsave(&tty->ctrl_lock, flags); | |
294 | pgrp = get_pid(tty->pgrp); | |
295 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); | |
296 | ||
297 | spin_lock_irqsave(&pty->ctrl_lock, flags); | |
298 | rpgrp = get_pid(pty->pgrp); | |
299 | spin_unlock_irqrestore(&pty->ctrl_lock, flags); | |
300 | ||
301 | if (pgrp) | |
302 | kill_pgrp(pgrp, SIGWINCH, 1); | |
303 | if (rpgrp != pgrp && rpgrp) | |
304 | kill_pgrp(rpgrp, SIGWINCH, 1); | |
305 | ||
306 | put_pid(pgrp); | |
307 | put_pid(rpgrp); | |
308 | ||
309 | tty->winsize = *ws; | |
310 | pty->winsize = *ws; /* Never used so will go away soon */ | |
311 | done: | |
dee4a0be | 312 | mutex_unlock(&tty->winsize_mutex); |
fc6f6238 AC |
313 | return 0; |
314 | } | |
315 | ||
01adc807 PH |
316 | /** |
317 | * pty_start - start() handler | |
318 | * pty_stop - stop() handler | |
319 | * @tty: tty being flow-controlled | |
320 | * | |
321 | * Propagates the TIOCPKT status to the master pty. | |
322 | * | |
323 | * NB: only the master pty can be in packet mode so only the slave | |
324 | * needs start()/stop() handlers | |
325 | */ | |
326 | static void pty_start(struct tty_struct *tty) | |
327 | { | |
328 | unsigned long flags; | |
329 | ||
330 | spin_lock_irqsave(&tty->ctrl_lock, flags); | |
331 | if (tty->link && tty->link->packet) { | |
332 | tty->ctrl_status &= ~TIOCPKT_STOP; | |
333 | tty->ctrl_status |= TIOCPKT_START; | |
334 | wake_up_interruptible_poll(&tty->link->read_wait, POLLIN); | |
335 | } | |
336 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); | |
337 | } | |
338 | ||
339 | static void pty_stop(struct tty_struct *tty) | |
340 | { | |
341 | unsigned long flags; | |
342 | ||
343 | spin_lock_irqsave(&tty->ctrl_lock, flags); | |
344 | if (tty->link && tty->link->packet) { | |
345 | tty->ctrl_status &= ~TIOCPKT_START; | |
346 | tty->ctrl_status |= TIOCPKT_STOP; | |
347 | wake_up_interruptible_poll(&tty->link->read_wait, POLLIN); | |
348 | } | |
349 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); | |
350 | } | |
351 | ||
d155255a AC |
352 | /** |
353 | * pty_common_install - set up the pty pair | |
354 | * @driver: the pty driver | |
355 | * @tty: the tty being instantiated | |
2c964a2f | 356 | * @legacy: true if this is BSD style |
d155255a AC |
357 | * |
358 | * Perform the initial set up for the tty/pty pair. Called from the | |
359 | * tty layer when the port is first opened. | |
360 | * | |
361 | * Locking: the caller must hold the tty_mutex | |
362 | */ | |
5d249bc6 JS |
363 | static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty, |
364 | bool legacy) | |
bf970ee4 AC |
365 | { |
366 | struct tty_struct *o_tty; | |
d03702a2 | 367 | struct tty_port *ports[2]; |
bf970ee4 | 368 | int idx = tty->index; |
5d249bc6 | 369 | int retval = -ENOMEM; |
bf970ee4 | 370 | |
d03702a2 JS |
371 | ports[0] = kmalloc(sizeof **ports, GFP_KERNEL); |
372 | ports[1] = kmalloc(sizeof **ports, GFP_KERNEL); | |
6f9ea7ad | 373 | if (!ports[0] || !ports[1]) |
2c964a2f | 374 | goto err; |
bf970ee4 AC |
375 | if (!try_module_get(driver->other->owner)) { |
376 | /* This cannot in fact currently happen */ | |
2c964a2f | 377 | goto err; |
bf970ee4 | 378 | } |
2c964a2f RV |
379 | o_tty = alloc_tty_struct(driver->other, idx); |
380 | if (!o_tty) | |
381 | goto err_put_module; | |
bf970ee4 | 382 | |
5d249bc6 JS |
383 | if (legacy) { |
384 | /* We always use new tty termios data so we can do this | |
385 | the easy way .. */ | |
386 | retval = tty_init_termios(tty); | |
387 | if (retval) | |
388 | goto err_deinit_tty; | |
389 | ||
390 | retval = tty_init_termios(o_tty); | |
391 | if (retval) | |
392 | goto err_free_termios; | |
393 | ||
394 | driver->other->ttys[idx] = o_tty; | |
395 | driver->ttys[idx] = tty; | |
396 | } else { | |
adc8d746 AC |
397 | memset(&tty->termios_locked, 0, sizeof(tty->termios_locked)); |
398 | tty->termios = driver->init_termios; | |
399 | memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked)); | |
400 | o_tty->termios = driver->other->init_termios; | |
5d249bc6 | 401 | } |
fe9cd962 | 402 | |
bf970ee4 AC |
403 | /* |
404 | * Everything allocated ... set up the o_tty structure. | |
405 | */ | |
bf970ee4 AC |
406 | tty_driver_kref_get(driver->other); |
407 | if (driver->subtype == PTY_TYPE_MASTER) | |
408 | o_tty->count++; | |
409 | /* Establish the links in both directions */ | |
410 | tty->link = o_tty; | |
411 | o_tty->link = tty; | |
d03702a2 JS |
412 | tty_port_init(ports[0]); |
413 | tty_port_init(ports[1]); | |
414 | o_tty->port = ports[0]; | |
415 | tty->port = ports[1]; | |
967fab69 | 416 | o_tty->port->itty = o_tty; |
bf970ee4 AC |
417 | |
418 | tty_driver_kref_get(driver); | |
419 | tty->count++; | |
bf970ee4 | 420 | return 0; |
8a1b8d70 | 421 | err_free_termios: |
5d249bc6 JS |
422 | if (legacy) |
423 | tty_free_termios(tty); | |
a9dccddb JS |
424 | err_deinit_tty: |
425 | deinitialize_tty_struct(o_tty); | |
2c964a2f RV |
426 | free_tty_struct(o_tty); |
427 | err_put_module: | |
07584d4a | 428 | module_put(driver->other->owner); |
2c964a2f | 429 | err: |
d03702a2 JS |
430 | kfree(ports[0]); |
431 | kfree(ports[1]); | |
8a1b8d70 | 432 | return retval; |
bf970ee4 AC |
433 | } |
434 | ||
d03702a2 JS |
435 | static void pty_cleanup(struct tty_struct *tty) |
436 | { | |
81c79838 | 437 | tty_port_put(tty->port); |
d03702a2 JS |
438 | } |
439 | ||
5d249bc6 JS |
440 | /* Traditional BSD devices */ |
441 | #ifdef CONFIG_LEGACY_PTYS | |
442 | ||
443 | static int pty_install(struct tty_driver *driver, struct tty_struct *tty) | |
444 | { | |
445 | return pty_common_install(driver, tty, true); | |
446 | } | |
447 | ||
d155255a AC |
448 | static void pty_remove(struct tty_driver *driver, struct tty_struct *tty) |
449 | { | |
450 | struct tty_struct *pair = tty->link; | |
451 | driver->ttys[tty->index] = NULL; | |
452 | if (pair) | |
453 | pair->driver->ttys[pair->index] = NULL; | |
454 | } | |
455 | ||
6caa76b7 | 456 | static int pty_bsd_ioctl(struct tty_struct *tty, |
1da177e4 LT |
457 | unsigned int cmd, unsigned long arg) |
458 | { | |
459 | switch (cmd) { | |
460 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
461 | return pty_set_lock(tty, (int __user *) arg); | |
84fd7bdf CG |
462 | case TIOCGPTLCK: /* Get PT Lock status */ |
463 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
464 | case TIOCPKT: /* Set PT packet mode */ |
465 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
466 | case TIOCGPKT: /* Get PT packet mode */ |
467 | return pty_get_pktmode(tty, (int __user *)arg); | |
26df6d13 | 468 | case TIOCSIG: /* Send signal to other side of pty */ |
469 | return pty_signal(tty, (int) arg); | |
ded2f295 JS |
470 | case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */ |
471 | return -EINVAL; | |
1da177e4 LT |
472 | } |
473 | return -ENOIOCTLCMD; | |
474 | } | |
475 | ||
dc8c8587 KS |
476 | static int legacy_count = CONFIG_LEGACY_PTY_COUNT; |
477 | module_param(legacy_count, int, 0); | |
478 | ||
342a5971 LT |
479 | /* |
480 | * The master side of a pty can do TIOCSPTLCK and thus | |
481 | * has pty_bsd_ioctl. | |
482 | */ | |
483 | static const struct tty_operations master_pty_ops_bsd = { | |
484 | .install = pty_install, | |
3e8e88ca AC |
485 | .open = pty_open, |
486 | .close = pty_close, | |
487 | .write = pty_write, | |
488 | .write_room = pty_write_room, | |
489 | .flush_buffer = pty_flush_buffer, | |
490 | .chars_in_buffer = pty_chars_in_buffer, | |
491 | .unthrottle = pty_unthrottle, | |
492 | .set_termios = pty_set_termios, | |
493 | .ioctl = pty_bsd_ioctl, | |
d03702a2 | 494 | .cleanup = pty_cleanup, |
d155255a AC |
495 | .resize = pty_resize, |
496 | .remove = pty_remove | |
3e8e88ca AC |
497 | }; |
498 | ||
342a5971 LT |
499 | static const struct tty_operations slave_pty_ops_bsd = { |
500 | .install = pty_install, | |
501 | .open = pty_open, | |
502 | .close = pty_close, | |
503 | .write = pty_write, | |
504 | .write_room = pty_write_room, | |
505 | .flush_buffer = pty_flush_buffer, | |
506 | .chars_in_buffer = pty_chars_in_buffer, | |
507 | .unthrottle = pty_unthrottle, | |
508 | .set_termios = pty_set_termios, | |
d03702a2 | 509 | .cleanup = pty_cleanup, |
d155255a | 510 | .resize = pty_resize, |
01adc807 PH |
511 | .start = pty_start, |
512 | .stop = pty_stop, | |
d155255a | 513 | .remove = pty_remove |
342a5971 LT |
514 | }; |
515 | ||
1da177e4 LT |
516 | static void __init legacy_pty_init(void) |
517 | { | |
342a5971 LT |
518 | struct tty_driver *pty_driver, *pty_slave_driver; |
519 | ||
dc8c8587 KS |
520 | if (legacy_count <= 0) |
521 | return; | |
1da177e4 | 522 | |
21aca2fa JS |
523 | pty_driver = tty_alloc_driver(legacy_count, |
524 | TTY_DRIVER_RESET_TERMIOS | | |
525 | TTY_DRIVER_REAL_RAW | | |
526 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 527 | if (IS_ERR(pty_driver)) |
1da177e4 LT |
528 | panic("Couldn't allocate pty driver"); |
529 | ||
21aca2fa JS |
530 | pty_slave_driver = tty_alloc_driver(legacy_count, |
531 | TTY_DRIVER_RESET_TERMIOS | | |
532 | TTY_DRIVER_REAL_RAW | | |
533 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 534 | if (IS_ERR(pty_slave_driver)) |
1da177e4 LT |
535 | panic("Couldn't allocate pty slave driver"); |
536 | ||
1da177e4 LT |
537 | pty_driver->driver_name = "pty_master"; |
538 | pty_driver->name = "pty"; | |
1da177e4 LT |
539 | pty_driver->major = PTY_MASTER_MAJOR; |
540 | pty_driver->minor_start = 0; | |
541 | pty_driver->type = TTY_DRIVER_TYPE_PTY; | |
542 | pty_driver->subtype = PTY_TYPE_MASTER; | |
543 | pty_driver->init_termios = tty_std_termios; | |
544 | pty_driver->init_termios.c_iflag = 0; | |
545 | pty_driver->init_termios.c_oflag = 0; | |
546 | pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
547 | pty_driver->init_termios.c_lflag = 0; | |
606d099c AC |
548 | pty_driver->init_termios.c_ispeed = 38400; |
549 | pty_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 550 | pty_driver->other = pty_slave_driver; |
342a5971 | 551 | tty_set_operations(pty_driver, &master_pty_ops_bsd); |
1da177e4 | 552 | |
1da177e4 LT |
553 | pty_slave_driver->driver_name = "pty_slave"; |
554 | pty_slave_driver->name = "ttyp"; | |
1da177e4 LT |
555 | pty_slave_driver->major = PTY_SLAVE_MAJOR; |
556 | pty_slave_driver->minor_start = 0; | |
557 | pty_slave_driver->type = TTY_DRIVER_TYPE_PTY; | |
558 | pty_slave_driver->subtype = PTY_TYPE_SLAVE; | |
559 | pty_slave_driver->init_termios = tty_std_termios; | |
560 | pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
561 | pty_slave_driver->init_termios.c_ispeed = 38400; |
562 | pty_slave_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 563 | pty_slave_driver->other = pty_driver; |
342a5971 | 564 | tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd); |
1da177e4 LT |
565 | |
566 | if (tty_register_driver(pty_driver)) | |
567 | panic("Couldn't register pty driver"); | |
568 | if (tty_register_driver(pty_slave_driver)) | |
569 | panic("Couldn't register pty slave driver"); | |
570 | } | |
571 | #else | |
572 | static inline void legacy_pty_init(void) { } | |
573 | #endif | |
574 | ||
575 | /* Unix98 devices */ | |
576 | #ifdef CONFIG_UNIX98_PTYS | |
1da177e4 | 577 | |
d81ed103 AC |
578 | static struct cdev ptmx_cdev; |
579 | ||
6caa76b7 | 580 | static int pty_unix98_ioctl(struct tty_struct *tty, |
1da177e4 LT |
581 | unsigned int cmd, unsigned long arg) |
582 | { | |
583 | switch (cmd) { | |
584 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
585 | return pty_set_lock(tty, (int __user *)arg); | |
84fd7bdf CG |
586 | case TIOCGPTLCK: /* Get PT Lock status */ |
587 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
588 | case TIOCPKT: /* Set PT packet mode */ |
589 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
590 | case TIOCGPKT: /* Get PT packet mode */ |
591 | return pty_get_pktmode(tty, (int __user *)arg); | |
1da177e4 LT |
592 | case TIOCGPTN: /* Get PT Number */ |
593 | return put_user(tty->index, (unsigned int __user *)arg); | |
26df6d13 | 594 | case TIOCSIG: /* Send signal to other side of pty */ |
595 | return pty_signal(tty, (int) arg); | |
1da177e4 LT |
596 | } |
597 | ||
598 | return -ENOIOCTLCMD; | |
599 | } | |
600 | ||
99f1fe18 AC |
601 | /** |
602 | * ptm_unix98_lookup - find a pty master | |
603 | * @driver: ptm driver | |
604 | * @idx: tty index | |
605 | * | |
606 | * Look up a pty master device. Called under the tty_mutex for now. | |
607 | * This provides our locking. | |
608 | */ | |
609 | ||
15f1a633 SB |
610 | static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, |
611 | struct inode *ptm_inode, int idx) | |
99f1fe18 | 612 | { |
593a27c4 KK |
613 | /* Master must be open via /dev/ptmx */ |
614 | return ERR_PTR(-EIO); | |
99f1fe18 AC |
615 | } |
616 | ||
617 | /** | |
618 | * pts_unix98_lookup - find a pty slave | |
619 | * @driver: pts driver | |
620 | * @idx: tty index | |
621 | * | |
622 | * Look up a pty master device. Called under the tty_mutex for now. | |
d739e65b | 623 | * This provides our locking for the tty pointer. |
99f1fe18 AC |
624 | */ |
625 | ||
15f1a633 SB |
626 | static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver, |
627 | struct inode *pts_inode, int idx) | |
99f1fe18 | 628 | { |
d739e65b AC |
629 | struct tty_struct *tty; |
630 | ||
631 | mutex_lock(&devpts_mutex); | |
8fcbaa2b | 632 | tty = devpts_get_priv(pts_inode); |
d739e65b | 633 | mutex_unlock(&devpts_mutex); |
99f1fe18 AC |
634 | /* Master must be open before slave */ |
635 | if (!tty) | |
636 | return ERR_PTR(-EIO); | |
637 | return tty; | |
638 | } | |
639 | ||
8b0a88d5 AC |
640 | /* We have no need to install and remove our tty objects as devpts does all |
641 | the work for us */ | |
642 | ||
bf970ee4 | 643 | static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty) |
8b0a88d5 | 644 | { |
5d249bc6 | 645 | return pty_common_install(driver, tty, false); |
8b0a88d5 AC |
646 | } |
647 | ||
7171604a | 648 | static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty) |
8b0a88d5 AC |
649 | { |
650 | } | |
651 | ||
f4b208eb JS |
652 | /* this is called once with whichever end is closed last */ |
653 | static void pty_unix98_shutdown(struct tty_struct *tty) | |
654 | { | |
655 | devpts_kill_index(tty->driver_data, tty->index); | |
656 | } | |
657 | ||
feebed65 | 658 | static const struct tty_operations ptm_unix98_ops = { |
99f1fe18 | 659 | .lookup = ptm_unix98_lookup, |
bf970ee4 | 660 | .install = pty_unix98_install, |
7171604a | 661 | .remove = pty_unix98_remove, |
3e8e88ca AC |
662 | .open = pty_open, |
663 | .close = pty_close, | |
664 | .write = pty_write, | |
665 | .write_room = pty_write_room, | |
666 | .flush_buffer = pty_flush_buffer, | |
667 | .chars_in_buffer = pty_chars_in_buffer, | |
668 | .unthrottle = pty_unthrottle, | |
669 | .set_termios = pty_set_termios, | |
feebed65 | 670 | .ioctl = pty_unix98_ioctl, |
36b3c070 | 671 | .resize = pty_resize, |
fa2ecfc5 | 672 | .shutdown = pty_unix98_shutdown, |
36b3c070 | 673 | .cleanup = pty_cleanup |
3e8e88ca AC |
674 | }; |
675 | ||
99f1fe18 AC |
676 | static const struct tty_operations pty_unix98_ops = { |
677 | .lookup = pts_unix98_lookup, | |
bf970ee4 | 678 | .install = pty_unix98_install, |
7171604a | 679 | .remove = pty_unix98_remove, |
99f1fe18 AC |
680 | .open = pty_open, |
681 | .close = pty_close, | |
682 | .write = pty_write, | |
683 | .write_room = pty_write_room, | |
684 | .flush_buffer = pty_flush_buffer, | |
685 | .chars_in_buffer = pty_chars_in_buffer, | |
686 | .unthrottle = pty_unthrottle, | |
687 | .set_termios = pty_set_termios, | |
01adc807 PH |
688 | .start = pty_start, |
689 | .stop = pty_stop, | |
fa2ecfc5 | 690 | .shutdown = pty_unix98_shutdown, |
d03702a2 | 691 | .cleanup = pty_cleanup, |
99f1fe18 | 692 | }; |
d81ed103 AC |
693 | |
694 | /** | |
695 | * ptmx_open - open a unix 98 pty master | |
696 | * @inode: inode of device file | |
697 | * @filp: file pointer to tty | |
698 | * | |
699 | * Allocate a unix98 pty master device from the ptmx driver. | |
700 | * | |
701 | * Locking: tty_mutex protects the init_dev work. tty->count should | |
b9f8033f | 702 | * protect the rest. |
d81ed103 AC |
703 | * allocated_ptys_lock handles the list of free pty numbers |
704 | */ | |
705 | ||
64ba3dc3 | 706 | static int ptmx_open(struct inode *inode, struct file *filp) |
d81ed103 AC |
707 | { |
708 | struct tty_struct *tty; | |
162b97cf | 709 | struct inode *slave_inode; |
d81ed103 AC |
710 | int retval; |
711 | int index; | |
712 | ||
713 | nonseekable_open(inode, filp); | |
714 | ||
b0b88565 LT |
715 | /* We refuse fsnotify events on ptmx, since it's a shared resource */ |
716 | filp->f_mode |= FMODE_NONOTIFY; | |
717 | ||
fa90e1c9 JS |
718 | retval = tty_alloc_file(filp); |
719 | if (retval) | |
720 | return retval; | |
721 | ||
d81ed103 | 722 | /* find a device that is not in use. */ |
89c8d91e | 723 | mutex_lock(&devpts_mutex); |
15f1a633 | 724 | index = devpts_new_index(inode); |
fa90e1c9 JS |
725 | if (index < 0) { |
726 | retval = index; | |
05fb79e4 | 727 | mutex_unlock(&devpts_mutex); |
fa90e1c9 JS |
728 | goto err_file; |
729 | } | |
d81ed103 | 730 | |
89c8d91e AC |
731 | mutex_unlock(&devpts_mutex); |
732 | ||
d81ed103 | 733 | mutex_lock(&tty_mutex); |
593a27c4 | 734 | tty = tty_init_dev(ptm_driver, index); |
d81ed103 | 735 | |
73ec06fc AC |
736 | if (IS_ERR(tty)) { |
737 | retval = PTR_ERR(tty); | |
d81ed103 | 738 | goto out; |
73ec06fc | 739 | } |
d81ed103 | 740 | |
89c8d91e AC |
741 | /* The tty returned here is locked so we can safely |
742 | drop the mutex */ | |
743 | mutex_unlock(&tty_mutex); | |
744 | ||
d81ed103 | 745 | set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ |
7acf6cd8 | 746 | tty->driver_data = inode; |
ee2ffa0d | 747 | |
fa90e1c9 | 748 | tty_add_file(tty, filp); |
d81ed103 | 749 | |
f11afb61 JS |
750 | slave_inode = devpts_pty_new(inode, |
751 | MKDEV(UNIX98_PTY_SLAVE_MAJOR, index), index, | |
752 | tty->link); | |
162b97cf JS |
753 | if (IS_ERR(slave_inode)) { |
754 | retval = PTR_ERR(slave_inode); | |
1177c0ef | 755 | goto err_release; |
162b97cf | 756 | } |
7acf6cd8 | 757 | tty->link->driver_data = slave_inode; |
d81ed103 AC |
758 | |
759 | retval = ptm_driver->ops->open(tty, filp); | |
64ba3dc3 | 760 | if (retval) |
1177c0ef JS |
761 | goto err_release; |
762 | ||
89c8d91e | 763 | tty_unlock(tty); |
1177c0ef JS |
764 | return 0; |
765 | err_release: | |
89c8d91e | 766 | tty_unlock(tty); |
eeb89d91 | 767 | tty_release(inode, filp); |
d81ed103 AC |
768 | return retval; |
769 | out: | |
89c8d91e | 770 | mutex_unlock(&tty_mutex); |
d3bda529 | 771 | devpts_kill_index(inode, index); |
fa90e1c9 JS |
772 | err_file: |
773 | tty_free_file(filp); | |
64ba3dc3 | 774 | return retval; |
d81ed103 AC |
775 | } |
776 | ||
777 | static struct file_operations ptmx_fops; | |
778 | ||
1da177e4 LT |
779 | static void __init unix98_pty_init(void) |
780 | { | |
21aca2fa JS |
781 | ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
782 | TTY_DRIVER_RESET_TERMIOS | | |
783 | TTY_DRIVER_REAL_RAW | | |
784 | TTY_DRIVER_DYNAMIC_DEV | | |
785 | TTY_DRIVER_DEVPTS_MEM | | |
786 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 787 | if (IS_ERR(ptm_driver)) |
1da177e4 | 788 | panic("Couldn't allocate Unix98 ptm driver"); |
21aca2fa JS |
789 | pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
790 | TTY_DRIVER_RESET_TERMIOS | | |
791 | TTY_DRIVER_REAL_RAW | | |
792 | TTY_DRIVER_DYNAMIC_DEV | | |
793 | TTY_DRIVER_DEVPTS_MEM | | |
794 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 795 | if (IS_ERR(pts_driver)) |
1da177e4 LT |
796 | panic("Couldn't allocate Unix98 pts driver"); |
797 | ||
1da177e4 LT |
798 | ptm_driver->driver_name = "pty_master"; |
799 | ptm_driver->name = "ptm"; | |
800 | ptm_driver->major = UNIX98_PTY_MASTER_MAJOR; | |
801 | ptm_driver->minor_start = 0; | |
802 | ptm_driver->type = TTY_DRIVER_TYPE_PTY; | |
803 | ptm_driver->subtype = PTY_TYPE_MASTER; | |
804 | ptm_driver->init_termios = tty_std_termios; | |
805 | ptm_driver->init_termios.c_iflag = 0; | |
806 | ptm_driver->init_termios.c_oflag = 0; | |
807 | ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
808 | ptm_driver->init_termios.c_lflag = 0; | |
606d099c AC |
809 | ptm_driver->init_termios.c_ispeed = 38400; |
810 | ptm_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 811 | ptm_driver->other = pts_driver; |
feebed65 | 812 | tty_set_operations(ptm_driver, &ptm_unix98_ops); |
1da177e4 | 813 | |
1da177e4 LT |
814 | pts_driver->driver_name = "pty_slave"; |
815 | pts_driver->name = "pts"; | |
816 | pts_driver->major = UNIX98_PTY_SLAVE_MAJOR; | |
817 | pts_driver->minor_start = 0; | |
818 | pts_driver->type = TTY_DRIVER_TYPE_PTY; | |
819 | pts_driver->subtype = PTY_TYPE_SLAVE; | |
820 | pts_driver->init_termios = tty_std_termios; | |
821 | pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
822 | pts_driver->init_termios.c_ispeed = 38400; |
823 | pts_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 824 | pts_driver->other = ptm_driver; |
99f1fe18 | 825 | tty_set_operations(pts_driver, &pty_unix98_ops); |
fe9cd962 | 826 | |
1da177e4 LT |
827 | if (tty_register_driver(ptm_driver)) |
828 | panic("Couldn't register Unix98 ptm driver"); | |
829 | if (tty_register_driver(pts_driver)) | |
830 | panic("Couldn't register Unix98 pts driver"); | |
831 | ||
d81ed103 AC |
832 | /* Now create the /dev/ptmx special device */ |
833 | tty_default_fops(&ptmx_fops); | |
834 | ptmx_fops.open = ptmx_open; | |
835 | ||
836 | cdev_init(&ptmx_cdev, &ptmx_fops); | |
837 | if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) || | |
838 | register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0) | |
82f8c35f | 839 | panic("Couldn't register /dev/ptmx driver"); |
d81ed103 | 840 | device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); |
1da177e4 | 841 | } |
d81ed103 | 842 | |
1da177e4 LT |
843 | #else |
844 | static inline void unix98_pty_init(void) { } | |
845 | #endif | |
846 | ||
847 | static int __init pty_init(void) | |
848 | { | |
849 | legacy_pty_init(); | |
850 | unix98_pty_init(); | |
851 | return 0; | |
852 | } | |
853 | module_init(pty_init); |