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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 { | |
69939035 PH |
41 | if (test_bit(TTY_IO_ERROR, &tty->flags)) |
42 | return; | |
1da177e4 LT |
43 | if (tty->count > 2) |
44 | return; | |
45 | } | |
69939035 | 46 | set_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
47 | wake_up_interruptible(&tty->read_wait); |
48 | wake_up_interruptible(&tty->write_wait); | |
49 | tty->packet = 0; | |
89c8d91e | 50 | /* Review - krefs on tty_link ?? */ |
1da177e4 LT |
51 | if (!tty->link) |
52 | return; | |
1da177e4 LT |
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); | |
ce1000dd | 58 | #ifdef CONFIG_UNIX98_PTYS |
d739e65b | 59 | if (tty->driver == ptm_driver) { |
b9f8033f | 60 | mutex_lock(&devpts_mutex); |
7acf6cd8 PH |
61 | if (tty->link->driver_data) |
62 | devpts_pty_kill(tty->link->driver_data); | |
b9f8033f | 63 | mutex_unlock(&devpts_mutex); |
d739e65b | 64 | } |
ce1000dd | 65 | #endif |
89c8d91e | 66 | tty_unlock(tty); |
11dbf203 | 67 | tty_vhangup(tty->link); |
89c8d91e | 68 | tty_lock(tty); |
1da177e4 LT |
69 | } |
70 | } | |
71 | ||
72 | /* | |
73 | * The unthrottle routine is called by the line discipline to signal | |
74 | * that it can receive more characters. For PTY's, the TTY_THROTTLED | |
75 | * flag is always set, to force the line discipline to always call the | |
fe9cd962 | 76 | * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE |
1da177e4 LT |
77 | * characters in the queue. This is necessary since each time this |
78 | * happens, we need to wake up any sleeping processes that could be | |
79 | * (1) trying to send data to the pty, or (2) waiting in wait_until_sent() | |
80 | * for the pty buffer to be drained. | |
81 | */ | |
fe9cd962 | 82 | static void pty_unthrottle(struct tty_struct *tty) |
1da177e4 | 83 | { |
d945cb9c | 84 | tty_wakeup(tty->link); |
1da177e4 LT |
85 | set_bit(TTY_THROTTLED, &tty->flags); |
86 | } | |
87 | ||
d945cb9c AC |
88 | /** |
89 | * pty_space - report space left for writing | |
90 | * @to: tty we are writing into | |
1da177e4 | 91 | * |
7bfe0b71 | 92 | * Limit the buffer space used by ptys to 8k. |
d945cb9c AC |
93 | */ |
94 | ||
95 | static int pty_space(struct tty_struct *to) | |
96 | { | |
7bfe0b71 PH |
97 | int n = tty_buffer_space_avail(to->port); |
98 | return min(n, 8192); | |
d945cb9c AC |
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 | |
762faaed | 106 | * |
d945cb9c AC |
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. | |
1da177e4 | 111 | */ |
d945cb9c | 112 | |
ac89a917 | 113 | static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c) |
1da177e4 LT |
114 | { |
115 | struct tty_struct *to = tty->link; | |
1da177e4 | 116 | |
d945cb9c | 117 | if (tty->stopped) |
1da177e4 | 118 | return 0; |
d945cb9c | 119 | |
d945cb9c AC |
120 | if (c > 0) { |
121 | /* Stuff the data into the input queue of the other end */ | |
05c7cd39 | 122 | c = tty_insert_flip_string(to->port, buf, c); |
d945cb9c | 123 | /* And shovel */ |
5ede5253 | 124 | if (c) |
2e124b4a | 125 | tty_flip_buffer_push(to->port); |
762faaed | 126 | } |
1da177e4 LT |
127 | return c; |
128 | } | |
129 | ||
d945cb9c AC |
130 | /** |
131 | * pty_write_room - write space | |
132 | * @tty: tty we are writing from | |
133 | * | |
134 | * Report how many bytes the ldisc can send into the queue for | |
135 | * the other device. | |
136 | */ | |
137 | ||
1da177e4 LT |
138 | static int pty_write_room(struct tty_struct *tty) |
139 | { | |
85dfd81d LT |
140 | if (tty->stopped) |
141 | return 0; | |
d945cb9c | 142 | return pty_space(tty->link); |
1da177e4 LT |
143 | } |
144 | ||
d945cb9c AC |
145 | /** |
146 | * pty_chars_in_buffer - characters currently in our tx queue | |
147 | * @tty: our tty | |
fe9cd962 | 148 | * |
d945cb9c AC |
149 | * Report how much we have in the transmit queue. As everything is |
150 | * instantly at the other end this is easy to implement. | |
1da177e4 | 151 | */ |
d945cb9c | 152 | |
1da177e4 LT |
153 | static int pty_chars_in_buffer(struct tty_struct *tty) |
154 | { | |
d945cb9c | 155 | return 0; |
1da177e4 LT |
156 | } |
157 | ||
158 | /* Set the lock flag on a pty */ | |
fe9cd962 | 159 | static int pty_set_lock(struct tty_struct *tty, int __user *arg) |
1da177e4 LT |
160 | { |
161 | int val; | |
fe9cd962 | 162 | if (get_user(val, arg)) |
1da177e4 LT |
163 | return -EFAULT; |
164 | if (val) | |
165 | set_bit(TTY_PTY_LOCK, &tty->flags); | |
166 | else | |
167 | clear_bit(TTY_PTY_LOCK, &tty->flags); | |
168 | return 0; | |
169 | } | |
170 | ||
84fd7bdf CG |
171 | static int pty_get_lock(struct tty_struct *tty, int __user *arg) |
172 | { | |
173 | int locked = test_bit(TTY_PTY_LOCK, &tty->flags); | |
174 | return put_user(locked, arg); | |
175 | } | |
176 | ||
06026d91 CG |
177 | /* Set the packet mode on a pty */ |
178 | static int pty_set_pktmode(struct tty_struct *tty, int __user *arg) | |
179 | { | |
180 | unsigned long flags; | |
181 | int pktmode; | |
182 | ||
183 | if (get_user(pktmode, arg)) | |
184 | return -EFAULT; | |
185 | ||
186 | spin_lock_irqsave(&tty->ctrl_lock, flags); | |
187 | if (pktmode) { | |
188 | if (!tty->packet) { | |
189 | tty->packet = 1; | |
190 | tty->link->ctrl_status = 0; | |
191 | } | |
192 | } else | |
193 | tty->packet = 0; | |
194 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
84fd7bdf CG |
199 | /* Get the packet mode of a pty */ |
200 | static int pty_get_pktmode(struct tty_struct *tty, int __user *arg) | |
201 | { | |
202 | int pktmode = tty->packet; | |
203 | return put_user(pktmode, arg); | |
204 | } | |
205 | ||
26df6d13 | 206 | /* Send a signal to the slave */ |
207 | static int pty_signal(struct tty_struct *tty, int sig) | |
208 | { | |
209 | unsigned long flags; | |
210 | struct pid *pgrp; | |
211 | ||
212 | if (tty->link) { | |
213 | spin_lock_irqsave(&tty->link->ctrl_lock, flags); | |
214 | pgrp = get_pid(tty->link->pgrp); | |
215 | spin_unlock_irqrestore(&tty->link->ctrl_lock, flags); | |
216 | ||
217 | kill_pgrp(pgrp, sig, 1); | |
218 | put_pid(pgrp); | |
219 | } | |
220 | return 0; | |
221 | } | |
222 | ||
1da177e4 LT |
223 | static void pty_flush_buffer(struct tty_struct *tty) |
224 | { | |
225 | struct tty_struct *to = tty->link; | |
04f378b1 | 226 | unsigned long flags; |
fe9cd962 | 227 | |
1da177e4 LT |
228 | if (!to) |
229 | return; | |
d945cb9c | 230 | /* tty_buffer_flush(to); FIXME */ |
1da177e4 | 231 | if (to->packet) { |
04f378b1 | 232 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
1da177e4 LT |
233 | tty->ctrl_status |= TIOCPKT_FLUSHWRITE; |
234 | wake_up_interruptible(&to->read_wait); | |
04f378b1 | 235 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
1da177e4 LT |
236 | } |
237 | } | |
238 | ||
fe9cd962 | 239 | static int pty_open(struct tty_struct *tty, struct file *filp) |
1da177e4 | 240 | { |
1da177e4 | 241 | if (!tty || !tty->link) |
7c61c3d8 | 242 | return -ENODEV; |
69939035 | 243 | |
1da177e4 LT |
244 | if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) |
245 | goto out; | |
246 | if (test_bit(TTY_PTY_LOCK, &tty->link->flags)) | |
247 | goto out; | |
80cace72 | 248 | if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1) |
1da177e4 LT |
249 | goto out; |
250 | ||
69939035 | 251 | clear_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
252 | clear_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
253 | set_bit(TTY_THROTTLED, &tty->flags); | |
7c61c3d8 PH |
254 | return 0; |
255 | ||
1da177e4 | 256 | out: |
7c61c3d8 PH |
257 | set_bit(TTY_IO_ERROR, &tty->flags); |
258 | return -EIO; | |
1da177e4 LT |
259 | } |
260 | ||
fe9cd962 AC |
261 | static void pty_set_termios(struct tty_struct *tty, |
262 | struct ktermios *old_termios) | |
1da177e4 | 263 | { |
adc8d746 AC |
264 | tty->termios.c_cflag &= ~(CSIZE | PARENB); |
265 | tty->termios.c_cflag |= (CS8 | CREAD); | |
1da177e4 LT |
266 | } |
267 | ||
fc6f6238 AC |
268 | /** |
269 | * pty_do_resize - resize event | |
270 | * @tty: tty being resized | |
c774bda2 | 271 | * @ws: window size being set. |
fc6f6238 | 272 | * |
3ad2f3fb | 273 | * Update the termios variables and send the necessary signals to |
fc6f6238 AC |
274 | * peform a terminal resize correctly |
275 | */ | |
276 | ||
159a8e92 | 277 | static int pty_resize(struct tty_struct *tty, struct winsize *ws) |
fc6f6238 AC |
278 | { |
279 | struct pid *pgrp, *rpgrp; | |
280 | unsigned long flags; | |
281 | struct tty_struct *pty = tty->link; | |
282 | ||
283 | /* For a PTY we need to lock the tty side */ | |
dee4a0be | 284 | mutex_lock(&tty->winsize_mutex); |
fc6f6238 AC |
285 | if (!memcmp(ws, &tty->winsize, sizeof(*ws))) |
286 | goto done; | |
287 | ||
288 | /* Get the PID values and reference them so we can | |
289 | avoid holding the tty ctrl lock while sending signals. | |
290 | We need to lock these individually however. */ | |
291 | ||
292 | spin_lock_irqsave(&tty->ctrl_lock, flags); | |
293 | pgrp = get_pid(tty->pgrp); | |
294 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); | |
295 | ||
296 | spin_lock_irqsave(&pty->ctrl_lock, flags); | |
297 | rpgrp = get_pid(pty->pgrp); | |
298 | spin_unlock_irqrestore(&pty->ctrl_lock, flags); | |
299 | ||
300 | if (pgrp) | |
301 | kill_pgrp(pgrp, SIGWINCH, 1); | |
302 | if (rpgrp != pgrp && rpgrp) | |
303 | kill_pgrp(rpgrp, SIGWINCH, 1); | |
304 | ||
305 | put_pid(pgrp); | |
306 | put_pid(rpgrp); | |
307 | ||
308 | tty->winsize = *ws; | |
309 | pty->winsize = *ws; /* Never used so will go away soon */ | |
310 | done: | |
dee4a0be | 311 | mutex_unlock(&tty->winsize_mutex); |
fc6f6238 AC |
312 | return 0; |
313 | } | |
314 | ||
d155255a AC |
315 | /** |
316 | * pty_common_install - set up the pty pair | |
317 | * @driver: the pty driver | |
318 | * @tty: the tty being instantiated | |
2c964a2f | 319 | * @legacy: true if this is BSD style |
d155255a AC |
320 | * |
321 | * Perform the initial set up for the tty/pty pair. Called from the | |
322 | * tty layer when the port is first opened. | |
323 | * | |
324 | * Locking: the caller must hold the tty_mutex | |
325 | */ | |
5d249bc6 JS |
326 | static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty, |
327 | bool legacy) | |
bf970ee4 AC |
328 | { |
329 | struct tty_struct *o_tty; | |
d03702a2 | 330 | struct tty_port *ports[2]; |
bf970ee4 | 331 | int idx = tty->index; |
5d249bc6 | 332 | int retval = -ENOMEM; |
bf970ee4 | 333 | |
d03702a2 JS |
334 | ports[0] = kmalloc(sizeof **ports, GFP_KERNEL); |
335 | ports[1] = kmalloc(sizeof **ports, GFP_KERNEL); | |
6f9ea7ad | 336 | if (!ports[0] || !ports[1]) |
2c964a2f | 337 | goto err; |
bf970ee4 AC |
338 | if (!try_module_get(driver->other->owner)) { |
339 | /* This cannot in fact currently happen */ | |
2c964a2f | 340 | goto err; |
bf970ee4 | 341 | } |
2c964a2f RV |
342 | o_tty = alloc_tty_struct(driver->other, idx); |
343 | if (!o_tty) | |
344 | goto err_put_module; | |
bf970ee4 | 345 | |
5d249bc6 JS |
346 | if (legacy) { |
347 | /* We always use new tty termios data so we can do this | |
348 | the easy way .. */ | |
349 | retval = tty_init_termios(tty); | |
350 | if (retval) | |
351 | goto err_deinit_tty; | |
352 | ||
353 | retval = tty_init_termios(o_tty); | |
354 | if (retval) | |
355 | goto err_free_termios; | |
356 | ||
357 | driver->other->ttys[idx] = o_tty; | |
358 | driver->ttys[idx] = tty; | |
359 | } else { | |
adc8d746 AC |
360 | memset(&tty->termios_locked, 0, sizeof(tty->termios_locked)); |
361 | tty->termios = driver->init_termios; | |
362 | memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked)); | |
363 | o_tty->termios = driver->other->init_termios; | |
5d249bc6 | 364 | } |
fe9cd962 | 365 | |
bf970ee4 AC |
366 | /* |
367 | * Everything allocated ... set up the o_tty structure. | |
368 | */ | |
bf970ee4 AC |
369 | tty_driver_kref_get(driver->other); |
370 | if (driver->subtype == PTY_TYPE_MASTER) | |
371 | o_tty->count++; | |
372 | /* Establish the links in both directions */ | |
373 | tty->link = o_tty; | |
374 | o_tty->link = tty; | |
d03702a2 JS |
375 | tty_port_init(ports[0]); |
376 | tty_port_init(ports[1]); | |
377 | o_tty->port = ports[0]; | |
378 | tty->port = ports[1]; | |
967fab69 | 379 | o_tty->port->itty = o_tty; |
bf970ee4 AC |
380 | |
381 | tty_driver_kref_get(driver); | |
382 | tty->count++; | |
bf970ee4 | 383 | return 0; |
8a1b8d70 | 384 | err_free_termios: |
5d249bc6 JS |
385 | if (legacy) |
386 | tty_free_termios(tty); | |
a9dccddb JS |
387 | err_deinit_tty: |
388 | deinitialize_tty_struct(o_tty); | |
2c964a2f RV |
389 | free_tty_struct(o_tty); |
390 | err_put_module: | |
07584d4a | 391 | module_put(driver->other->owner); |
2c964a2f | 392 | err: |
d03702a2 JS |
393 | kfree(ports[0]); |
394 | kfree(ports[1]); | |
8a1b8d70 | 395 | return retval; |
bf970ee4 AC |
396 | } |
397 | ||
d03702a2 JS |
398 | static void pty_cleanup(struct tty_struct *tty) |
399 | { | |
81c79838 | 400 | tty_port_put(tty->port); |
d03702a2 JS |
401 | } |
402 | ||
5d249bc6 JS |
403 | /* Traditional BSD devices */ |
404 | #ifdef CONFIG_LEGACY_PTYS | |
405 | ||
406 | static int pty_install(struct tty_driver *driver, struct tty_struct *tty) | |
407 | { | |
408 | return pty_common_install(driver, tty, true); | |
409 | } | |
410 | ||
d155255a AC |
411 | static void pty_remove(struct tty_driver *driver, struct tty_struct *tty) |
412 | { | |
413 | struct tty_struct *pair = tty->link; | |
414 | driver->ttys[tty->index] = NULL; | |
415 | if (pair) | |
416 | pair->driver->ttys[pair->index] = NULL; | |
417 | } | |
418 | ||
6caa76b7 | 419 | static int pty_bsd_ioctl(struct tty_struct *tty, |
1da177e4 LT |
420 | unsigned int cmd, unsigned long arg) |
421 | { | |
422 | switch (cmd) { | |
423 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
424 | return pty_set_lock(tty, (int __user *) arg); | |
84fd7bdf CG |
425 | case TIOCGPTLCK: /* Get PT Lock status */ |
426 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
427 | case TIOCPKT: /* Set PT packet mode */ |
428 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
429 | case TIOCGPKT: /* Get PT packet mode */ |
430 | return pty_get_pktmode(tty, (int __user *)arg); | |
26df6d13 | 431 | case TIOCSIG: /* Send signal to other side of pty */ |
432 | return pty_signal(tty, (int) arg); | |
ded2f295 JS |
433 | case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */ |
434 | return -EINVAL; | |
1da177e4 LT |
435 | } |
436 | return -ENOIOCTLCMD; | |
437 | } | |
438 | ||
dc8c8587 KS |
439 | static int legacy_count = CONFIG_LEGACY_PTY_COUNT; |
440 | module_param(legacy_count, int, 0); | |
441 | ||
342a5971 LT |
442 | /* |
443 | * The master side of a pty can do TIOCSPTLCK and thus | |
444 | * has pty_bsd_ioctl. | |
445 | */ | |
446 | static const struct tty_operations master_pty_ops_bsd = { | |
447 | .install = pty_install, | |
3e8e88ca AC |
448 | .open = pty_open, |
449 | .close = pty_close, | |
450 | .write = pty_write, | |
451 | .write_room = pty_write_room, | |
452 | .flush_buffer = pty_flush_buffer, | |
453 | .chars_in_buffer = pty_chars_in_buffer, | |
454 | .unthrottle = pty_unthrottle, | |
455 | .set_termios = pty_set_termios, | |
456 | .ioctl = pty_bsd_ioctl, | |
d03702a2 | 457 | .cleanup = pty_cleanup, |
d155255a AC |
458 | .resize = pty_resize, |
459 | .remove = pty_remove | |
3e8e88ca AC |
460 | }; |
461 | ||
342a5971 LT |
462 | static const struct tty_operations slave_pty_ops_bsd = { |
463 | .install = pty_install, | |
464 | .open = pty_open, | |
465 | .close = pty_close, | |
466 | .write = pty_write, | |
467 | .write_room = pty_write_room, | |
468 | .flush_buffer = pty_flush_buffer, | |
469 | .chars_in_buffer = pty_chars_in_buffer, | |
470 | .unthrottle = pty_unthrottle, | |
471 | .set_termios = pty_set_termios, | |
d03702a2 | 472 | .cleanup = pty_cleanup, |
d155255a AC |
473 | .resize = pty_resize, |
474 | .remove = pty_remove | |
342a5971 LT |
475 | }; |
476 | ||
1da177e4 LT |
477 | static void __init legacy_pty_init(void) |
478 | { | |
342a5971 LT |
479 | struct tty_driver *pty_driver, *pty_slave_driver; |
480 | ||
dc8c8587 KS |
481 | if (legacy_count <= 0) |
482 | return; | |
1da177e4 | 483 | |
21aca2fa JS |
484 | pty_driver = tty_alloc_driver(legacy_count, |
485 | TTY_DRIVER_RESET_TERMIOS | | |
486 | TTY_DRIVER_REAL_RAW | | |
487 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 488 | if (IS_ERR(pty_driver)) |
1da177e4 LT |
489 | panic("Couldn't allocate pty driver"); |
490 | ||
21aca2fa JS |
491 | pty_slave_driver = tty_alloc_driver(legacy_count, |
492 | TTY_DRIVER_RESET_TERMIOS | | |
493 | TTY_DRIVER_REAL_RAW | | |
494 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 495 | if (IS_ERR(pty_slave_driver)) |
1da177e4 LT |
496 | panic("Couldn't allocate pty slave driver"); |
497 | ||
1da177e4 LT |
498 | pty_driver->driver_name = "pty_master"; |
499 | pty_driver->name = "pty"; | |
1da177e4 LT |
500 | pty_driver->major = PTY_MASTER_MAJOR; |
501 | pty_driver->minor_start = 0; | |
502 | pty_driver->type = TTY_DRIVER_TYPE_PTY; | |
503 | pty_driver->subtype = PTY_TYPE_MASTER; | |
504 | pty_driver->init_termios = tty_std_termios; | |
505 | pty_driver->init_termios.c_iflag = 0; | |
506 | pty_driver->init_termios.c_oflag = 0; | |
507 | pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
508 | pty_driver->init_termios.c_lflag = 0; | |
606d099c AC |
509 | pty_driver->init_termios.c_ispeed = 38400; |
510 | pty_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 511 | pty_driver->other = pty_slave_driver; |
342a5971 | 512 | tty_set_operations(pty_driver, &master_pty_ops_bsd); |
1da177e4 | 513 | |
1da177e4 LT |
514 | pty_slave_driver->driver_name = "pty_slave"; |
515 | pty_slave_driver->name = "ttyp"; | |
1da177e4 LT |
516 | pty_slave_driver->major = PTY_SLAVE_MAJOR; |
517 | pty_slave_driver->minor_start = 0; | |
518 | pty_slave_driver->type = TTY_DRIVER_TYPE_PTY; | |
519 | pty_slave_driver->subtype = PTY_TYPE_SLAVE; | |
520 | pty_slave_driver->init_termios = tty_std_termios; | |
521 | pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
522 | pty_slave_driver->init_termios.c_ispeed = 38400; |
523 | pty_slave_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 524 | pty_slave_driver->other = pty_driver; |
342a5971 | 525 | tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd); |
1da177e4 LT |
526 | |
527 | if (tty_register_driver(pty_driver)) | |
528 | panic("Couldn't register pty driver"); | |
529 | if (tty_register_driver(pty_slave_driver)) | |
530 | panic("Couldn't register pty slave driver"); | |
531 | } | |
532 | #else | |
533 | static inline void legacy_pty_init(void) { } | |
534 | #endif | |
535 | ||
536 | /* Unix98 devices */ | |
537 | #ifdef CONFIG_UNIX98_PTYS | |
1da177e4 | 538 | |
d81ed103 AC |
539 | static struct cdev ptmx_cdev; |
540 | ||
6caa76b7 | 541 | static int pty_unix98_ioctl(struct tty_struct *tty, |
1da177e4 LT |
542 | unsigned int cmd, unsigned long arg) |
543 | { | |
544 | switch (cmd) { | |
545 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
546 | return pty_set_lock(tty, (int __user *)arg); | |
84fd7bdf CG |
547 | case TIOCGPTLCK: /* Get PT Lock status */ |
548 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
549 | case TIOCPKT: /* Set PT packet mode */ |
550 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
551 | case TIOCGPKT: /* Get PT packet mode */ |
552 | return pty_get_pktmode(tty, (int __user *)arg); | |
1da177e4 LT |
553 | case TIOCGPTN: /* Get PT Number */ |
554 | return put_user(tty->index, (unsigned int __user *)arg); | |
26df6d13 | 555 | case TIOCSIG: /* Send signal to other side of pty */ |
556 | return pty_signal(tty, (int) arg); | |
1da177e4 LT |
557 | } |
558 | ||
559 | return -ENOIOCTLCMD; | |
560 | } | |
561 | ||
99f1fe18 AC |
562 | /** |
563 | * ptm_unix98_lookup - find a pty master | |
564 | * @driver: ptm driver | |
565 | * @idx: tty index | |
566 | * | |
567 | * Look up a pty master device. Called under the tty_mutex for now. | |
568 | * This provides our locking. | |
569 | */ | |
570 | ||
15f1a633 SB |
571 | static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, |
572 | struct inode *ptm_inode, int idx) | |
99f1fe18 | 573 | { |
593a27c4 KK |
574 | /* Master must be open via /dev/ptmx */ |
575 | return ERR_PTR(-EIO); | |
99f1fe18 AC |
576 | } |
577 | ||
578 | /** | |
579 | * pts_unix98_lookup - find a pty slave | |
580 | * @driver: pts driver | |
581 | * @idx: tty index | |
582 | * | |
583 | * Look up a pty master device. Called under the tty_mutex for now. | |
d739e65b | 584 | * This provides our locking for the tty pointer. |
99f1fe18 AC |
585 | */ |
586 | ||
15f1a633 SB |
587 | static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver, |
588 | struct inode *pts_inode, int idx) | |
99f1fe18 | 589 | { |
d739e65b AC |
590 | struct tty_struct *tty; |
591 | ||
592 | mutex_lock(&devpts_mutex); | |
8fcbaa2b | 593 | tty = devpts_get_priv(pts_inode); |
d739e65b | 594 | mutex_unlock(&devpts_mutex); |
99f1fe18 AC |
595 | /* Master must be open before slave */ |
596 | if (!tty) | |
597 | return ERR_PTR(-EIO); | |
598 | return tty; | |
599 | } | |
600 | ||
8b0a88d5 AC |
601 | /* We have no need to install and remove our tty objects as devpts does all |
602 | the work for us */ | |
603 | ||
bf970ee4 | 604 | static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty) |
8b0a88d5 | 605 | { |
5d249bc6 | 606 | return pty_common_install(driver, tty, false); |
8b0a88d5 AC |
607 | } |
608 | ||
7171604a | 609 | static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty) |
8b0a88d5 AC |
610 | { |
611 | } | |
612 | ||
f4b208eb JS |
613 | /* this is called once with whichever end is closed last */ |
614 | static void pty_unix98_shutdown(struct tty_struct *tty) | |
615 | { | |
616 | devpts_kill_index(tty->driver_data, tty->index); | |
617 | } | |
618 | ||
feebed65 | 619 | static const struct tty_operations ptm_unix98_ops = { |
99f1fe18 | 620 | .lookup = ptm_unix98_lookup, |
bf970ee4 | 621 | .install = pty_unix98_install, |
7171604a | 622 | .remove = pty_unix98_remove, |
3e8e88ca AC |
623 | .open = pty_open, |
624 | .close = pty_close, | |
625 | .write = pty_write, | |
626 | .write_room = pty_write_room, | |
627 | .flush_buffer = pty_flush_buffer, | |
628 | .chars_in_buffer = pty_chars_in_buffer, | |
629 | .unthrottle = pty_unthrottle, | |
630 | .set_termios = pty_set_termios, | |
feebed65 | 631 | .ioctl = pty_unix98_ioctl, |
36b3c070 | 632 | .resize = pty_resize, |
fa2ecfc5 | 633 | .shutdown = pty_unix98_shutdown, |
36b3c070 | 634 | .cleanup = pty_cleanup |
3e8e88ca AC |
635 | }; |
636 | ||
99f1fe18 AC |
637 | static const struct tty_operations pty_unix98_ops = { |
638 | .lookup = pts_unix98_lookup, | |
bf970ee4 | 639 | .install = pty_unix98_install, |
7171604a | 640 | .remove = pty_unix98_remove, |
99f1fe18 AC |
641 | .open = pty_open, |
642 | .close = pty_close, | |
643 | .write = pty_write, | |
644 | .write_room = pty_write_room, | |
645 | .flush_buffer = pty_flush_buffer, | |
646 | .chars_in_buffer = pty_chars_in_buffer, | |
647 | .unthrottle = pty_unthrottle, | |
648 | .set_termios = pty_set_termios, | |
fa2ecfc5 | 649 | .shutdown = pty_unix98_shutdown, |
d03702a2 | 650 | .cleanup = pty_cleanup, |
99f1fe18 | 651 | }; |
d81ed103 AC |
652 | |
653 | /** | |
654 | * ptmx_open - open a unix 98 pty master | |
655 | * @inode: inode of device file | |
656 | * @filp: file pointer to tty | |
657 | * | |
658 | * Allocate a unix98 pty master device from the ptmx driver. | |
659 | * | |
660 | * Locking: tty_mutex protects the init_dev work. tty->count should | |
b9f8033f | 661 | * protect the rest. |
d81ed103 AC |
662 | * allocated_ptys_lock handles the list of free pty numbers |
663 | */ | |
664 | ||
64ba3dc3 | 665 | static int ptmx_open(struct inode *inode, struct file *filp) |
d81ed103 AC |
666 | { |
667 | struct tty_struct *tty; | |
162b97cf | 668 | struct inode *slave_inode; |
d81ed103 AC |
669 | int retval; |
670 | int index; | |
671 | ||
672 | nonseekable_open(inode, filp); | |
673 | ||
b0b88565 LT |
674 | /* We refuse fsnotify events on ptmx, since it's a shared resource */ |
675 | filp->f_mode |= FMODE_NONOTIFY; | |
676 | ||
fa90e1c9 JS |
677 | retval = tty_alloc_file(filp); |
678 | if (retval) | |
679 | return retval; | |
680 | ||
d81ed103 | 681 | /* find a device that is not in use. */ |
89c8d91e | 682 | mutex_lock(&devpts_mutex); |
15f1a633 | 683 | index = devpts_new_index(inode); |
fa90e1c9 JS |
684 | if (index < 0) { |
685 | retval = index; | |
05fb79e4 | 686 | mutex_unlock(&devpts_mutex); |
fa90e1c9 JS |
687 | goto err_file; |
688 | } | |
d81ed103 | 689 | |
89c8d91e AC |
690 | mutex_unlock(&devpts_mutex); |
691 | ||
d81ed103 | 692 | mutex_lock(&tty_mutex); |
593a27c4 | 693 | tty = tty_init_dev(ptm_driver, index); |
d81ed103 | 694 | |
73ec06fc AC |
695 | if (IS_ERR(tty)) { |
696 | retval = PTR_ERR(tty); | |
d81ed103 | 697 | goto out; |
73ec06fc | 698 | } |
d81ed103 | 699 | |
89c8d91e AC |
700 | /* The tty returned here is locked so we can safely |
701 | drop the mutex */ | |
702 | mutex_unlock(&tty_mutex); | |
703 | ||
d81ed103 | 704 | set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ |
7acf6cd8 | 705 | tty->driver_data = inode; |
ee2ffa0d | 706 | |
fa90e1c9 | 707 | tty_add_file(tty, filp); |
d81ed103 | 708 | |
f11afb61 JS |
709 | slave_inode = devpts_pty_new(inode, |
710 | MKDEV(UNIX98_PTY_SLAVE_MAJOR, index), index, | |
711 | tty->link); | |
162b97cf JS |
712 | if (IS_ERR(slave_inode)) { |
713 | retval = PTR_ERR(slave_inode); | |
1177c0ef | 714 | goto err_release; |
162b97cf | 715 | } |
7acf6cd8 | 716 | tty->link->driver_data = slave_inode; |
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); |
1177c0ef JS |
723 | return 0; |
724 | err_release: | |
89c8d91e | 725 | tty_unlock(tty); |
eeb89d91 | 726 | tty_release(inode, filp); |
d81ed103 AC |
727 | return retval; |
728 | out: | |
89c8d91e | 729 | mutex_unlock(&tty_mutex); |
d3bda529 | 730 | devpts_kill_index(inode, index); |
fa90e1c9 JS |
731 | err_file: |
732 | tty_free_file(filp); | |
64ba3dc3 | 733 | return retval; |
d81ed103 AC |
734 | } |
735 | ||
736 | static struct file_operations ptmx_fops; | |
737 | ||
1da177e4 LT |
738 | static void __init unix98_pty_init(void) |
739 | { | |
21aca2fa JS |
740 | ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
741 | TTY_DRIVER_RESET_TERMIOS | | |
742 | TTY_DRIVER_REAL_RAW | | |
743 | TTY_DRIVER_DYNAMIC_DEV | | |
744 | TTY_DRIVER_DEVPTS_MEM | | |
745 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 746 | if (IS_ERR(ptm_driver)) |
1da177e4 | 747 | panic("Couldn't allocate Unix98 ptm driver"); |
21aca2fa JS |
748 | pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
749 | TTY_DRIVER_RESET_TERMIOS | | |
750 | TTY_DRIVER_REAL_RAW | | |
751 | TTY_DRIVER_DYNAMIC_DEV | | |
752 | TTY_DRIVER_DEVPTS_MEM | | |
753 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 754 | if (IS_ERR(pts_driver)) |
1da177e4 LT |
755 | panic("Couldn't allocate Unix98 pts driver"); |
756 | ||
1da177e4 LT |
757 | ptm_driver->driver_name = "pty_master"; |
758 | ptm_driver->name = "ptm"; | |
759 | ptm_driver->major = UNIX98_PTY_MASTER_MAJOR; | |
760 | ptm_driver->minor_start = 0; | |
761 | ptm_driver->type = TTY_DRIVER_TYPE_PTY; | |
762 | ptm_driver->subtype = PTY_TYPE_MASTER; | |
763 | ptm_driver->init_termios = tty_std_termios; | |
764 | ptm_driver->init_termios.c_iflag = 0; | |
765 | ptm_driver->init_termios.c_oflag = 0; | |
766 | ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
767 | ptm_driver->init_termios.c_lflag = 0; | |
606d099c AC |
768 | ptm_driver->init_termios.c_ispeed = 38400; |
769 | ptm_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 770 | ptm_driver->other = pts_driver; |
feebed65 | 771 | tty_set_operations(ptm_driver, &ptm_unix98_ops); |
1da177e4 | 772 | |
1da177e4 LT |
773 | pts_driver->driver_name = "pty_slave"; |
774 | pts_driver->name = "pts"; | |
775 | pts_driver->major = UNIX98_PTY_SLAVE_MAJOR; | |
776 | pts_driver->minor_start = 0; | |
777 | pts_driver->type = TTY_DRIVER_TYPE_PTY; | |
778 | pts_driver->subtype = PTY_TYPE_SLAVE; | |
779 | pts_driver->init_termios = tty_std_termios; | |
780 | pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
781 | pts_driver->init_termios.c_ispeed = 38400; |
782 | pts_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 783 | pts_driver->other = ptm_driver; |
99f1fe18 | 784 | tty_set_operations(pts_driver, &pty_unix98_ops); |
fe9cd962 | 785 | |
1da177e4 LT |
786 | if (tty_register_driver(ptm_driver)) |
787 | panic("Couldn't register Unix98 ptm driver"); | |
788 | if (tty_register_driver(pts_driver)) | |
789 | panic("Couldn't register Unix98 pts driver"); | |
790 | ||
d81ed103 AC |
791 | /* Now create the /dev/ptmx special device */ |
792 | tty_default_fops(&ptmx_fops); | |
793 | ptmx_fops.open = ptmx_open; | |
794 | ||
795 | cdev_init(&ptmx_cdev, &ptmx_fops); | |
796 | if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) || | |
797 | register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0) | |
82f8c35f | 798 | panic("Couldn't register /dev/ptmx driver"); |
d81ed103 | 799 | device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); |
1da177e4 | 800 | } |
d81ed103 | 801 | |
1da177e4 LT |
802 | #else |
803 | static inline void unix98_pty_init(void) { } | |
804 | #endif | |
805 | ||
806 | static int __init pty_init(void) | |
807 | { | |
808 | legacy_pty_init(); | |
809 | unix98_pty_init(); | |
810 | return 0; | |
811 | } | |
812 | module_init(pty_init); |