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 | * |
fe9cd962 AC |
7 | * When reading this code see also fs/devpts. In particular note that the |
8 | * driver_data field is used by the devpts side as a binding to the devpts | |
9 | * inode. | |
1da177e4 LT |
10 | */ |
11 | ||
fe9cd962 | 12 | #include <linux/module.h> |
1da177e4 LT |
13 | |
14 | #include <linux/errno.h> | |
1da177e4 LT |
15 | #include <linux/interrupt.h> |
16 | #include <linux/tty.h> | |
17 | #include <linux/tty_flip.h> | |
18 | #include <linux/fcntl.h> | |
d43c36dc | 19 | #include <linux/sched.h> |
1da177e4 LT |
20 | #include <linux/string.h> |
21 | #include <linux/major.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/init.h> | |
d81ed103 | 24 | #include <linux/device.h> |
fe9cd962 | 25 | #include <linux/uaccess.h> |
1da177e4 LT |
26 | #include <linux/bitops.h> |
27 | #include <linux/devpts_fs.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
1da177e4 | 29 | |
fe9cd962 AC |
30 | #include <asm/system.h> |
31 | ||
1da177e4 | 32 | #ifdef CONFIG_UNIX98_PTYS |
da2bdf9a | 33 | static struct tty_driver *ptm_driver; |
1da177e4 LT |
34 | static struct tty_driver *pts_driver; |
35 | #endif | |
36 | ||
fe9cd962 | 37 | static void pty_close(struct tty_struct *tty, struct file *filp) |
1da177e4 | 38 | { |
fe9cd962 AC |
39 | BUG_ON(!tty); |
40 | if (tty->driver->subtype == PTY_TYPE_MASTER) | |
41 | WARN_ON(tty->count > 1); | |
42 | else { | |
1da177e4 LT |
43 | if (tty->count > 2) |
44 | return; | |
45 | } | |
46 | wake_up_interruptible(&tty->read_wait); | |
47 | wake_up_interruptible(&tty->write_wait); | |
48 | tty->packet = 0; | |
49 | if (!tty->link) | |
50 | return; | |
51 | tty->link->packet = 0; | |
52 | set_bit(TTY_OTHER_CLOSED, &tty->link->flags); | |
53 | wake_up_interruptible(&tty->link->read_wait); | |
54 | wake_up_interruptible(&tty->link->write_wait); | |
55 | if (tty->driver->subtype == PTY_TYPE_MASTER) { | |
56 | set_bit(TTY_OTHER_CLOSED, &tty->flags); | |
a50f724a | 57 | devpts_pty_kill(tty->link); |
11dbf203 AB |
58 | tty_unlock(); |
59 | tty_vhangup(tty->link); | |
60 | tty_lock(); | |
1da177e4 LT |
61 | } |
62 | } | |
63 | ||
64 | /* | |
65 | * The unthrottle routine is called by the line discipline to signal | |
66 | * that it can receive more characters. For PTY's, the TTY_THROTTLED | |
67 | * flag is always set, to force the line discipline to always call the | |
fe9cd962 | 68 | * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE |
1da177e4 LT |
69 | * characters in the queue. This is necessary since each time this |
70 | * happens, we need to wake up any sleeping processes that could be | |
71 | * (1) trying to send data to the pty, or (2) waiting in wait_until_sent() | |
72 | * for the pty buffer to be drained. | |
73 | */ | |
fe9cd962 | 74 | static void pty_unthrottle(struct tty_struct *tty) |
1da177e4 | 75 | { |
d945cb9c | 76 | tty_wakeup(tty->link); |
1da177e4 LT |
77 | set_bit(TTY_THROTTLED, &tty->flags); |
78 | } | |
79 | ||
d945cb9c AC |
80 | /** |
81 | * pty_space - report space left for writing | |
82 | * @to: tty we are writing into | |
1da177e4 | 83 | * |
d945cb9c AC |
84 | * The tty buffers allow 64K but we sneak a peak and clip at 8K this |
85 | * allows a lot of overspill room for echo and other fun messes to | |
86 | * be handled properly | |
87 | */ | |
88 | ||
89 | static int pty_space(struct tty_struct *to) | |
90 | { | |
91 | int n = 8192 - to->buf.memory_used; | |
92 | if (n < 0) | |
93 | return 0; | |
94 | return n; | |
95 | } | |
96 | ||
97 | /** | |
98 | * pty_write - write to a pty | |
99 | * @tty: the tty we write from | |
100 | * @buf: kernel buffer of data | |
101 | * @count: bytes to write | |
762faaed | 102 | * |
d945cb9c AC |
103 | * Our "hardware" write method. Data is coming from the ldisc which |
104 | * may be in a non sleeping state. We simply throw this at the other | |
105 | * end of the link as if we were an IRQ handler receiving stuff for | |
106 | * the other side of the pty/tty pair. | |
1da177e4 | 107 | */ |
d945cb9c | 108 | |
ac89a917 | 109 | static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c) |
1da177e4 LT |
110 | { |
111 | struct tty_struct *to = tty->link; | |
1da177e4 | 112 | |
d945cb9c | 113 | if (tty->stopped) |
1da177e4 | 114 | return 0; |
d945cb9c | 115 | |
d945cb9c AC |
116 | if (c > 0) { |
117 | /* Stuff the data into the input queue of the other end */ | |
118 | c = tty_insert_flip_string(to, buf, c); | |
119 | /* And shovel */ | |
202c4675 LT |
120 | if (c) { |
121 | tty_flip_buffer_push(to); | |
122 | tty_wakeup(tty); | |
123 | } | |
762faaed | 124 | } |
1da177e4 LT |
125 | return c; |
126 | } | |
127 | ||
d945cb9c AC |
128 | /** |
129 | * pty_write_room - write space | |
130 | * @tty: tty we are writing from | |
131 | * | |
132 | * Report how many bytes the ldisc can send into the queue for | |
133 | * the other device. | |
134 | */ | |
135 | ||
1da177e4 LT |
136 | static int pty_write_room(struct tty_struct *tty) |
137 | { | |
85dfd81d LT |
138 | if (tty->stopped) |
139 | return 0; | |
d945cb9c | 140 | return pty_space(tty->link); |
1da177e4 LT |
141 | } |
142 | ||
d945cb9c AC |
143 | /** |
144 | * pty_chars_in_buffer - characters currently in our tx queue | |
145 | * @tty: our tty | |
fe9cd962 | 146 | * |
d945cb9c AC |
147 | * Report how much we have in the transmit queue. As everything is |
148 | * instantly at the other end this is easy to implement. | |
1da177e4 | 149 | */ |
d945cb9c | 150 | |
1da177e4 LT |
151 | static int pty_chars_in_buffer(struct tty_struct *tty) |
152 | { | |
d945cb9c | 153 | return 0; |
1da177e4 LT |
154 | } |
155 | ||
156 | /* Set the lock flag on a pty */ | |
fe9cd962 | 157 | static int pty_set_lock(struct tty_struct *tty, int __user *arg) |
1da177e4 LT |
158 | { |
159 | int val; | |
fe9cd962 | 160 | if (get_user(val, arg)) |
1da177e4 LT |
161 | return -EFAULT; |
162 | if (val) | |
163 | set_bit(TTY_PTY_LOCK, &tty->flags); | |
164 | else | |
165 | clear_bit(TTY_PTY_LOCK, &tty->flags); | |
166 | return 0; | |
167 | } | |
168 | ||
26df6d13 | 169 | /* Send a signal to the slave */ |
170 | static int pty_signal(struct tty_struct *tty, int sig) | |
171 | { | |
172 | unsigned long flags; | |
173 | struct pid *pgrp; | |
174 | ||
175 | if (tty->link) { | |
176 | spin_lock_irqsave(&tty->link->ctrl_lock, flags); | |
177 | pgrp = get_pid(tty->link->pgrp); | |
178 | spin_unlock_irqrestore(&tty->link->ctrl_lock, flags); | |
179 | ||
180 | kill_pgrp(pgrp, sig, 1); | |
181 | put_pid(pgrp); | |
182 | } | |
183 | return 0; | |
184 | } | |
185 | ||
1da177e4 LT |
186 | static void pty_flush_buffer(struct tty_struct *tty) |
187 | { | |
188 | struct tty_struct *to = tty->link; | |
04f378b1 | 189 | unsigned long flags; |
fe9cd962 | 190 | |
1da177e4 LT |
191 | if (!to) |
192 | return; | |
d945cb9c | 193 | /* tty_buffer_flush(to); FIXME */ |
1da177e4 | 194 | if (to->packet) { |
04f378b1 | 195 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
1da177e4 LT |
196 | tty->ctrl_status |= TIOCPKT_FLUSHWRITE; |
197 | wake_up_interruptible(&to->read_wait); | |
04f378b1 | 198 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
1da177e4 LT |
199 | } |
200 | } | |
201 | ||
fe9cd962 | 202 | static int pty_open(struct tty_struct *tty, struct file *filp) |
1da177e4 LT |
203 | { |
204 | int retval = -ENODEV; | |
205 | ||
206 | if (!tty || !tty->link) | |
207 | goto out; | |
208 | ||
209 | retval = -EIO; | |
210 | if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) | |
211 | goto out; | |
212 | if (test_bit(TTY_PTY_LOCK, &tty->link->flags)) | |
213 | goto out; | |
214 | if (tty->link->count != 1) | |
215 | goto out; | |
216 | ||
217 | clear_bit(TTY_OTHER_CLOSED, &tty->link->flags); | |
218 | set_bit(TTY_THROTTLED, &tty->flags); | |
1da177e4 LT |
219 | retval = 0; |
220 | out: | |
221 | return retval; | |
222 | } | |
223 | ||
fe9cd962 AC |
224 | static void pty_set_termios(struct tty_struct *tty, |
225 | struct ktermios *old_termios) | |
1da177e4 | 226 | { |
fe9cd962 AC |
227 | tty->termios->c_cflag &= ~(CSIZE | PARENB); |
228 | tty->termios->c_cflag |= (CS8 | CREAD); | |
1da177e4 LT |
229 | } |
230 | ||
fc6f6238 AC |
231 | /** |
232 | * pty_do_resize - resize event | |
233 | * @tty: tty being resized | |
c774bda2 | 234 | * @ws: window size being set. |
fc6f6238 | 235 | * |
3ad2f3fb | 236 | * Update the termios variables and send the necessary signals to |
fc6f6238 AC |
237 | * peform a terminal resize correctly |
238 | */ | |
239 | ||
240 | int pty_resize(struct tty_struct *tty, struct winsize *ws) | |
241 | { | |
242 | struct pid *pgrp, *rpgrp; | |
243 | unsigned long flags; | |
244 | struct tty_struct *pty = tty->link; | |
245 | ||
246 | /* For a PTY we need to lock the tty side */ | |
247 | mutex_lock(&tty->termios_mutex); | |
248 | if (!memcmp(ws, &tty->winsize, sizeof(*ws))) | |
249 | goto done; | |
250 | ||
251 | /* Get the PID values and reference them so we can | |
252 | avoid holding the tty ctrl lock while sending signals. | |
253 | We need to lock these individually however. */ | |
254 | ||
255 | spin_lock_irqsave(&tty->ctrl_lock, flags); | |
256 | pgrp = get_pid(tty->pgrp); | |
257 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); | |
258 | ||
259 | spin_lock_irqsave(&pty->ctrl_lock, flags); | |
260 | rpgrp = get_pid(pty->pgrp); | |
261 | spin_unlock_irqrestore(&pty->ctrl_lock, flags); | |
262 | ||
263 | if (pgrp) | |
264 | kill_pgrp(pgrp, SIGWINCH, 1); | |
265 | if (rpgrp != pgrp && rpgrp) | |
266 | kill_pgrp(rpgrp, SIGWINCH, 1); | |
267 | ||
268 | put_pid(pgrp); | |
269 | put_pid(rpgrp); | |
270 | ||
271 | tty->winsize = *ws; | |
272 | pty->winsize = *ws; /* Never used so will go away soon */ | |
273 | done: | |
274 | mutex_unlock(&tty->termios_mutex); | |
275 | return 0; | |
276 | } | |
277 | ||
342a5971 LT |
278 | /* Traditional BSD devices */ |
279 | #ifdef CONFIG_LEGACY_PTYS | |
280 | ||
bf970ee4 AC |
281 | static int pty_install(struct tty_driver *driver, struct tty_struct *tty) |
282 | { | |
283 | struct tty_struct *o_tty; | |
284 | int idx = tty->index; | |
285 | int retval; | |
286 | ||
287 | o_tty = alloc_tty_struct(); | |
288 | if (!o_tty) | |
289 | return -ENOMEM; | |
290 | if (!try_module_get(driver->other->owner)) { | |
291 | /* This cannot in fact currently happen */ | |
8a1b8d70 JS |
292 | retval = -ENOMEM; |
293 | goto err_free_tty; | |
bf970ee4 AC |
294 | } |
295 | initialize_tty_struct(o_tty, driver->other, idx); | |
296 | ||
297 | /* We always use new tty termios data so we can do this | |
298 | the easy way .. */ | |
299 | retval = tty_init_termios(tty); | |
300 | if (retval) | |
a9dccddb | 301 | goto err_deinit_tty; |
bf970ee4 AC |
302 | |
303 | retval = tty_init_termios(o_tty); | |
8a1b8d70 JS |
304 | if (retval) |
305 | goto err_free_termios; | |
fe9cd962 | 306 | |
bf970ee4 AC |
307 | /* |
308 | * Everything allocated ... set up the o_tty structure. | |
309 | */ | |
310 | driver->other->ttys[idx] = o_tty; | |
311 | tty_driver_kref_get(driver->other); | |
312 | if (driver->subtype == PTY_TYPE_MASTER) | |
313 | o_tty->count++; | |
314 | /* Establish the links in both directions */ | |
315 | tty->link = o_tty; | |
316 | o_tty->link = tty; | |
317 | ||
318 | tty_driver_kref_get(driver); | |
319 | tty->count++; | |
320 | driver->ttys[idx] = tty; | |
321 | return 0; | |
8a1b8d70 JS |
322 | err_free_termios: |
323 | tty_free_termios(tty); | |
a9dccddb JS |
324 | err_deinit_tty: |
325 | deinitialize_tty_struct(o_tty); | |
bf970ee4 | 326 | module_put(o_tty->driver->owner); |
8a1b8d70 | 327 | err_free_tty: |
bf970ee4 | 328 | free_tty_struct(o_tty); |
8a1b8d70 | 329 | return retval; |
bf970ee4 AC |
330 | } |
331 | ||
6caa76b7 | 332 | static int pty_bsd_ioctl(struct tty_struct *tty, |
1da177e4 LT |
333 | unsigned int cmd, unsigned long arg) |
334 | { | |
335 | switch (cmd) { | |
336 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
337 | return pty_set_lock(tty, (int __user *) arg); | |
26df6d13 | 338 | case TIOCSIG: /* Send signal to other side of pty */ |
339 | return pty_signal(tty, (int) arg); | |
1da177e4 LT |
340 | } |
341 | return -ENOIOCTLCMD; | |
342 | } | |
343 | ||
dc8c8587 KS |
344 | static int legacy_count = CONFIG_LEGACY_PTY_COUNT; |
345 | module_param(legacy_count, int, 0); | |
346 | ||
342a5971 LT |
347 | /* |
348 | * The master side of a pty can do TIOCSPTLCK and thus | |
349 | * has pty_bsd_ioctl. | |
350 | */ | |
351 | static const struct tty_operations master_pty_ops_bsd = { | |
352 | .install = pty_install, | |
3e8e88ca AC |
353 | .open = pty_open, |
354 | .close = pty_close, | |
355 | .write = pty_write, | |
356 | .write_room = pty_write_room, | |
357 | .flush_buffer = pty_flush_buffer, | |
358 | .chars_in_buffer = pty_chars_in_buffer, | |
359 | .unthrottle = pty_unthrottle, | |
360 | .set_termios = pty_set_termios, | |
361 | .ioctl = pty_bsd_ioctl, | |
fc6f6238 | 362 | .resize = pty_resize |
3e8e88ca AC |
363 | }; |
364 | ||
342a5971 LT |
365 | static const struct tty_operations slave_pty_ops_bsd = { |
366 | .install = pty_install, | |
367 | .open = pty_open, | |
368 | .close = pty_close, | |
369 | .write = pty_write, | |
370 | .write_room = pty_write_room, | |
371 | .flush_buffer = pty_flush_buffer, | |
372 | .chars_in_buffer = pty_chars_in_buffer, | |
373 | .unthrottle = pty_unthrottle, | |
374 | .set_termios = pty_set_termios, | |
375 | .resize = pty_resize | |
376 | }; | |
377 | ||
1da177e4 LT |
378 | static void __init legacy_pty_init(void) |
379 | { | |
342a5971 LT |
380 | struct tty_driver *pty_driver, *pty_slave_driver; |
381 | ||
dc8c8587 KS |
382 | if (legacy_count <= 0) |
383 | return; | |
1da177e4 | 384 | |
dc8c8587 | 385 | pty_driver = alloc_tty_driver(legacy_count); |
1da177e4 LT |
386 | if (!pty_driver) |
387 | panic("Couldn't allocate pty driver"); | |
388 | ||
dc8c8587 | 389 | pty_slave_driver = alloc_tty_driver(legacy_count); |
1da177e4 LT |
390 | if (!pty_slave_driver) |
391 | panic("Couldn't allocate pty slave driver"); | |
392 | ||
393 | pty_driver->owner = THIS_MODULE; | |
394 | pty_driver->driver_name = "pty_master"; | |
395 | pty_driver->name = "pty"; | |
1da177e4 LT |
396 | pty_driver->major = PTY_MASTER_MAJOR; |
397 | pty_driver->minor_start = 0; | |
398 | pty_driver->type = TTY_DRIVER_TYPE_PTY; | |
399 | pty_driver->subtype = PTY_TYPE_MASTER; | |
400 | pty_driver->init_termios = tty_std_termios; | |
401 | pty_driver->init_termios.c_iflag = 0; | |
402 | pty_driver->init_termios.c_oflag = 0; | |
403 | pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
404 | pty_driver->init_termios.c_lflag = 0; | |
606d099c AC |
405 | pty_driver->init_termios.c_ispeed = 38400; |
406 | pty_driver->init_termios.c_ospeed = 38400; | |
1da177e4 LT |
407 | pty_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW; |
408 | pty_driver->other = pty_slave_driver; | |
342a5971 | 409 | tty_set_operations(pty_driver, &master_pty_ops_bsd); |
1da177e4 LT |
410 | |
411 | pty_slave_driver->owner = THIS_MODULE; | |
412 | pty_slave_driver->driver_name = "pty_slave"; | |
413 | pty_slave_driver->name = "ttyp"; | |
1da177e4 LT |
414 | pty_slave_driver->major = PTY_SLAVE_MAJOR; |
415 | pty_slave_driver->minor_start = 0; | |
416 | pty_slave_driver->type = TTY_DRIVER_TYPE_PTY; | |
417 | pty_slave_driver->subtype = PTY_TYPE_SLAVE; | |
418 | pty_slave_driver->init_termios = tty_std_termios; | |
419 | pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
420 | pty_slave_driver->init_termios.c_ispeed = 38400; |
421 | pty_slave_driver->init_termios.c_ospeed = 38400; | |
1da177e4 LT |
422 | pty_slave_driver->flags = TTY_DRIVER_RESET_TERMIOS | |
423 | TTY_DRIVER_REAL_RAW; | |
424 | pty_slave_driver->other = pty_driver; | |
342a5971 | 425 | tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd); |
1da177e4 LT |
426 | |
427 | if (tty_register_driver(pty_driver)) | |
428 | panic("Couldn't register pty driver"); | |
429 | if (tty_register_driver(pty_slave_driver)) | |
430 | panic("Couldn't register pty slave driver"); | |
431 | } | |
432 | #else | |
433 | static inline void legacy_pty_init(void) { } | |
434 | #endif | |
435 | ||
436 | /* Unix98 devices */ | |
437 | #ifdef CONFIG_UNIX98_PTYS | |
1da177e4 | 438 | |
d81ed103 AC |
439 | static struct cdev ptmx_cdev; |
440 | ||
6caa76b7 | 441 | static int pty_unix98_ioctl(struct tty_struct *tty, |
1da177e4 LT |
442 | unsigned int cmd, unsigned long arg) |
443 | { | |
444 | switch (cmd) { | |
445 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
446 | return pty_set_lock(tty, (int __user *)arg); | |
447 | case TIOCGPTN: /* Get PT Number */ | |
448 | return put_user(tty->index, (unsigned int __user *)arg); | |
26df6d13 | 449 | case TIOCSIG: /* Send signal to other side of pty */ |
450 | return pty_signal(tty, (int) arg); | |
1da177e4 LT |
451 | } |
452 | ||
453 | return -ENOIOCTLCMD; | |
454 | } | |
455 | ||
99f1fe18 AC |
456 | /** |
457 | * ptm_unix98_lookup - find a pty master | |
458 | * @driver: ptm driver | |
459 | * @idx: tty index | |
460 | * | |
461 | * Look up a pty master device. Called under the tty_mutex for now. | |
462 | * This provides our locking. | |
463 | */ | |
464 | ||
15f1a633 SB |
465 | static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, |
466 | struct inode *ptm_inode, int idx) | |
99f1fe18 | 467 | { |
593a27c4 KK |
468 | /* Master must be open via /dev/ptmx */ |
469 | return ERR_PTR(-EIO); | |
99f1fe18 AC |
470 | } |
471 | ||
472 | /** | |
473 | * pts_unix98_lookup - find a pty slave | |
474 | * @driver: pts driver | |
475 | * @idx: tty index | |
476 | * | |
477 | * Look up a pty master device. Called under the tty_mutex for now. | |
478 | * This provides our locking. | |
479 | */ | |
480 | ||
15f1a633 SB |
481 | static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver, |
482 | struct inode *pts_inode, int idx) | |
99f1fe18 | 483 | { |
15f1a633 | 484 | struct tty_struct *tty = devpts_get_tty(pts_inode, idx); |
99f1fe18 AC |
485 | /* Master must be open before slave */ |
486 | if (!tty) | |
487 | return ERR_PTR(-EIO); | |
488 | return tty; | |
489 | } | |
490 | ||
bf970ee4 | 491 | static void pty_unix98_shutdown(struct tty_struct *tty) |
feebed65 | 492 | { |
24d406a6 | 493 | tty_driver_remove_tty(tty->driver, tty); |
feebed65 AC |
494 | /* We have our own method as we don't use the tty index */ |
495 | kfree(tty->termios); | |
feebed65 AC |
496 | } |
497 | ||
8b0a88d5 AC |
498 | /* We have no need to install and remove our tty objects as devpts does all |
499 | the work for us */ | |
500 | ||
bf970ee4 | 501 | static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty) |
8b0a88d5 | 502 | { |
bf970ee4 AC |
503 | struct tty_struct *o_tty; |
504 | int idx = tty->index; | |
505 | ||
506 | o_tty = alloc_tty_struct(); | |
507 | if (!o_tty) | |
508 | return -ENOMEM; | |
509 | if (!try_module_get(driver->other->owner)) { | |
510 | /* This cannot in fact currently happen */ | |
c18d77aa | 511 | goto err_free_tty; |
bf970ee4 AC |
512 | } |
513 | initialize_tty_struct(o_tty, driver->other, idx); | |
514 | ||
8dff04ea | 515 | tty->termios = kzalloc(sizeof(struct ktermios[2]), GFP_KERNEL); |
bf970ee4 | 516 | if (tty->termios == NULL) |
c18d77aa | 517 | goto err_free_mem; |
bf970ee4 | 518 | *tty->termios = driver->init_termios; |
8dff04ea AC |
519 | tty->termios_locked = tty->termios + 1; |
520 | ||
521 | o_tty->termios = kzalloc(sizeof(struct ktermios[2]), GFP_KERNEL); | |
bf970ee4 | 522 | if (o_tty->termios == NULL) |
c18d77aa | 523 | goto err_free_mem; |
bf970ee4 | 524 | *o_tty->termios = driver->other->init_termios; |
8dff04ea | 525 | o_tty->termios_locked = o_tty->termios + 1; |
bf970ee4 AC |
526 | |
527 | tty_driver_kref_get(driver->other); | |
528 | if (driver->subtype == PTY_TYPE_MASTER) | |
529 | o_tty->count++; | |
530 | /* Establish the links in both directions */ | |
531 | tty->link = o_tty; | |
532 | o_tty->link = tty; | |
533 | /* | |
534 | * All structures have been allocated, so now we install them. | |
535 | * Failures after this point use release_tty to clean up, so | |
536 | * there's no need to null out the local pointers. | |
537 | */ | |
538 | tty_driver_kref_get(driver); | |
539 | tty->count++; | |
8b0a88d5 | 540 | return 0; |
c18d77aa | 541 | err_free_mem: |
a9dccddb | 542 | deinitialize_tty_struct(o_tty); |
8dff04ea | 543 | kfree(o_tty->termios); |
c18d77aa | 544 | kfree(tty->termios); |
bf970ee4 | 545 | module_put(o_tty->driver->owner); |
c18d77aa | 546 | err_free_tty: |
bf970ee4 | 547 | free_tty_struct(o_tty); |
bf970ee4 | 548 | return -ENOMEM; |
8b0a88d5 AC |
549 | } |
550 | ||
484af54d JS |
551 | static void ptm_unix98_remove(struct tty_driver *driver, struct tty_struct *tty) |
552 | { | |
484af54d JS |
553 | } |
554 | ||
555 | static void pts_unix98_remove(struct tty_driver *driver, struct tty_struct *tty) | |
8b0a88d5 AC |
556 | { |
557 | } | |
558 | ||
feebed65 | 559 | static const struct tty_operations ptm_unix98_ops = { |
99f1fe18 | 560 | .lookup = ptm_unix98_lookup, |
bf970ee4 | 561 | .install = pty_unix98_install, |
484af54d | 562 | .remove = ptm_unix98_remove, |
3e8e88ca AC |
563 | .open = pty_open, |
564 | .close = pty_close, | |
565 | .write = pty_write, | |
566 | .write_room = pty_write_room, | |
567 | .flush_buffer = pty_flush_buffer, | |
568 | .chars_in_buffer = pty_chars_in_buffer, | |
569 | .unthrottle = pty_unthrottle, | |
570 | .set_termios = pty_set_termios, | |
feebed65 | 571 | .ioctl = pty_unix98_ioctl, |
fc6f6238 AC |
572 | .shutdown = pty_unix98_shutdown, |
573 | .resize = pty_resize | |
3e8e88ca AC |
574 | }; |
575 | ||
99f1fe18 AC |
576 | static const struct tty_operations pty_unix98_ops = { |
577 | .lookup = pts_unix98_lookup, | |
bf970ee4 | 578 | .install = pty_unix98_install, |
484af54d | 579 | .remove = pts_unix98_remove, |
99f1fe18 AC |
580 | .open = pty_open, |
581 | .close = pty_close, | |
582 | .write = pty_write, | |
583 | .write_room = pty_write_room, | |
584 | .flush_buffer = pty_flush_buffer, | |
585 | .chars_in_buffer = pty_chars_in_buffer, | |
586 | .unthrottle = pty_unthrottle, | |
587 | .set_termios = pty_set_termios, | |
bf970ee4 | 588 | .shutdown = pty_unix98_shutdown |
99f1fe18 | 589 | }; |
d81ed103 AC |
590 | |
591 | /** | |
592 | * ptmx_open - open a unix 98 pty master | |
593 | * @inode: inode of device file | |
594 | * @filp: file pointer to tty | |
595 | * | |
596 | * Allocate a unix98 pty master device from the ptmx driver. | |
597 | * | |
598 | * Locking: tty_mutex protects the init_dev work. tty->count should | |
599 | * protect the rest. | |
600 | * allocated_ptys_lock handles the list of free pty numbers | |
601 | */ | |
602 | ||
64ba3dc3 | 603 | static int ptmx_open(struct inode *inode, struct file *filp) |
d81ed103 AC |
604 | { |
605 | struct tty_struct *tty; | |
606 | int retval; | |
607 | int index; | |
608 | ||
609 | nonseekable_open(inode, filp); | |
610 | ||
fa90e1c9 JS |
611 | retval = tty_alloc_file(filp); |
612 | if (retval) | |
613 | return retval; | |
614 | ||
d81ed103 | 615 | /* find a device that is not in use. */ |
64ba3dc3 | 616 | tty_lock(); |
15f1a633 | 617 | index = devpts_new_index(inode); |
64ba3dc3 | 618 | tty_unlock(); |
fa90e1c9 JS |
619 | if (index < 0) { |
620 | retval = index; | |
621 | goto err_file; | |
622 | } | |
d81ed103 AC |
623 | |
624 | mutex_lock(&tty_mutex); | |
64ba3dc3 | 625 | tty_lock(); |
593a27c4 | 626 | tty = tty_init_dev(ptm_driver, index); |
d81ed103 AC |
627 | mutex_unlock(&tty_mutex); |
628 | ||
73ec06fc AC |
629 | if (IS_ERR(tty)) { |
630 | retval = PTR_ERR(tty); | |
d81ed103 | 631 | goto out; |
73ec06fc | 632 | } |
d81ed103 AC |
633 | |
634 | set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ | |
ee2ffa0d | 635 | |
fa90e1c9 | 636 | tty_add_file(tty, filp); |
d81ed103 | 637 | |
15f1a633 | 638 | retval = devpts_pty_new(inode, tty->link); |
d81ed103 | 639 | if (retval) |
1177c0ef | 640 | goto err_release; |
d81ed103 AC |
641 | |
642 | retval = ptm_driver->ops->open(tty, filp); | |
64ba3dc3 | 643 | if (retval) |
1177c0ef JS |
644 | goto err_release; |
645 | ||
64ba3dc3 | 646 | tty_unlock(); |
1177c0ef JS |
647 | return 0; |
648 | err_release: | |
64ba3dc3 | 649 | tty_unlock(); |
eeb89d91 | 650 | tty_release(inode, filp); |
d81ed103 AC |
651 | return retval; |
652 | out: | |
15f1a633 | 653 | devpts_kill_index(inode, index); |
ec79d605 | 654 | tty_unlock(); |
fa90e1c9 JS |
655 | err_file: |
656 | tty_free_file(filp); | |
64ba3dc3 | 657 | return retval; |
d81ed103 AC |
658 | } |
659 | ||
660 | static struct file_operations ptmx_fops; | |
661 | ||
1da177e4 LT |
662 | static void __init unix98_pty_init(void) |
663 | { | |
1da177e4 LT |
664 | ptm_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX); |
665 | if (!ptm_driver) | |
666 | panic("Couldn't allocate Unix98 ptm driver"); | |
667 | pts_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX); | |
668 | if (!pts_driver) | |
669 | panic("Couldn't allocate Unix98 pts driver"); | |
670 | ||
671 | ptm_driver->owner = THIS_MODULE; | |
672 | ptm_driver->driver_name = "pty_master"; | |
673 | ptm_driver->name = "ptm"; | |
674 | ptm_driver->major = UNIX98_PTY_MASTER_MAJOR; | |
675 | ptm_driver->minor_start = 0; | |
676 | ptm_driver->type = TTY_DRIVER_TYPE_PTY; | |
677 | ptm_driver->subtype = PTY_TYPE_MASTER; | |
678 | ptm_driver->init_termios = tty_std_termios; | |
679 | ptm_driver->init_termios.c_iflag = 0; | |
680 | ptm_driver->init_termios.c_oflag = 0; | |
681 | ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
682 | ptm_driver->init_termios.c_lflag = 0; | |
606d099c AC |
683 | ptm_driver->init_termios.c_ispeed = 38400; |
684 | ptm_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 685 | ptm_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW | |
331b8319 | 686 | TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM; |
1da177e4 | 687 | ptm_driver->other = pts_driver; |
feebed65 | 688 | tty_set_operations(ptm_driver, &ptm_unix98_ops); |
1da177e4 LT |
689 | |
690 | pts_driver->owner = THIS_MODULE; | |
691 | pts_driver->driver_name = "pty_slave"; | |
692 | pts_driver->name = "pts"; | |
693 | pts_driver->major = UNIX98_PTY_SLAVE_MAJOR; | |
694 | pts_driver->minor_start = 0; | |
695 | pts_driver->type = TTY_DRIVER_TYPE_PTY; | |
696 | pts_driver->subtype = PTY_TYPE_SLAVE; | |
697 | pts_driver->init_termios = tty_std_termios; | |
698 | pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
699 | pts_driver->init_termios.c_ispeed = 38400; |
700 | pts_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 701 | pts_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW | |
331b8319 | 702 | TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM; |
1da177e4 | 703 | pts_driver->other = ptm_driver; |
99f1fe18 | 704 | tty_set_operations(pts_driver, &pty_unix98_ops); |
fe9cd962 | 705 | |
1da177e4 LT |
706 | if (tty_register_driver(ptm_driver)) |
707 | panic("Couldn't register Unix98 ptm driver"); | |
708 | if (tty_register_driver(pts_driver)) | |
709 | panic("Couldn't register Unix98 pts driver"); | |
710 | ||
d81ed103 AC |
711 | /* Now create the /dev/ptmx special device */ |
712 | tty_default_fops(&ptmx_fops); | |
713 | ptmx_fops.open = ptmx_open; | |
714 | ||
715 | cdev_init(&ptmx_cdev, &ptmx_fops); | |
716 | if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) || | |
717 | register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0) | |
718 | panic("Couldn't register /dev/ptmx driver\n"); | |
719 | device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); | |
1da177e4 | 720 | } |
d81ed103 | 721 | |
1da177e4 LT |
722 | #else |
723 | static inline void unix98_pty_init(void) { } | |
724 | #endif | |
725 | ||
726 | static int __init pty_init(void) | |
727 | { | |
728 | legacy_pty_init(); | |
729 | unix98_pty_init(); | |
730 | return 0; | |
731 | } | |
732 | module_init(pty_init); |