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 | { | |
26df6d13 | 210 | struct pid *pgrp; |
211 | ||
212 | if (tty->link) { | |
5b239542 PH |
213 | pgrp = tty_get_pgrp(tty->link); |
214 | if (pgrp) | |
215 | kill_pgrp(pgrp, sig, 1); | |
26df6d13 | 216 | put_pid(pgrp); |
217 | } | |
218 | return 0; | |
219 | } | |
220 | ||
1da177e4 LT |
221 | static void pty_flush_buffer(struct tty_struct *tty) |
222 | { | |
223 | struct tty_struct *to = tty->link; | |
04f378b1 | 224 | unsigned long flags; |
fe9cd962 | 225 | |
1da177e4 LT |
226 | if (!to) |
227 | return; | |
d945cb9c | 228 | /* tty_buffer_flush(to); FIXME */ |
1da177e4 | 229 | if (to->packet) { |
04f378b1 | 230 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
1da177e4 LT |
231 | tty->ctrl_status |= TIOCPKT_FLUSHWRITE; |
232 | wake_up_interruptible(&to->read_wait); | |
04f378b1 | 233 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
1da177e4 LT |
234 | } |
235 | } | |
236 | ||
fe9cd962 | 237 | static int pty_open(struct tty_struct *tty, struct file *filp) |
1da177e4 | 238 | { |
1da177e4 | 239 | if (!tty || !tty->link) |
7c61c3d8 | 240 | return -ENODEV; |
69939035 | 241 | |
1da177e4 LT |
242 | if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) |
243 | goto out; | |
244 | if (test_bit(TTY_PTY_LOCK, &tty->link->flags)) | |
245 | goto out; | |
80cace72 | 246 | if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1) |
1da177e4 LT |
247 | goto out; |
248 | ||
69939035 | 249 | clear_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
250 | clear_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
251 | set_bit(TTY_THROTTLED, &tty->flags); | |
7c61c3d8 PH |
252 | return 0; |
253 | ||
1da177e4 | 254 | out: |
7c61c3d8 PH |
255 | set_bit(TTY_IO_ERROR, &tty->flags); |
256 | return -EIO; | |
1da177e4 LT |
257 | } |
258 | ||
fe9cd962 AC |
259 | static void pty_set_termios(struct tty_struct *tty, |
260 | struct ktermios *old_termios) | |
1da177e4 | 261 | { |
dbfcd851 PH |
262 | unsigned long flags; |
263 | ||
264 | /* See if packet mode change of state. */ | |
265 | if (tty->link && tty->link->packet) { | |
266 | int extproc = (old_termios->c_lflag & EXTPROC) | | |
267 | (tty->termios.c_lflag & EXTPROC); | |
268 | int old_flow = ((old_termios->c_iflag & IXON) && | |
269 | (old_termios->c_cc[VSTOP] == '\023') && | |
270 | (old_termios->c_cc[VSTART] == '\021')); | |
271 | int new_flow = (I_IXON(tty) && | |
272 | STOP_CHAR(tty) == '\023' && | |
273 | START_CHAR(tty) == '\021'); | |
274 | if ((old_flow != new_flow) || extproc) { | |
275 | spin_lock_irqsave(&tty->ctrl_lock, flags); | |
276 | if (old_flow != new_flow) { | |
277 | tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); | |
278 | if (new_flow) | |
279 | tty->ctrl_status |= TIOCPKT_DOSTOP; | |
280 | else | |
281 | tty->ctrl_status |= TIOCPKT_NOSTOP; | |
282 | } | |
283 | if (extproc) | |
284 | tty->ctrl_status |= TIOCPKT_IOCTL; | |
285 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); | |
286 | wake_up_interruptible(&tty->link->read_wait); | |
287 | } | |
288 | } | |
289 | ||
adc8d746 AC |
290 | tty->termios.c_cflag &= ~(CSIZE | PARENB); |
291 | tty->termios.c_cflag |= (CS8 | CREAD); | |
1da177e4 LT |
292 | } |
293 | ||
fc6f6238 AC |
294 | /** |
295 | * pty_do_resize - resize event | |
296 | * @tty: tty being resized | |
c774bda2 | 297 | * @ws: window size being set. |
fc6f6238 | 298 | * |
3ad2f3fb | 299 | * Update the termios variables and send the necessary signals to |
fc6f6238 AC |
300 | * peform a terminal resize correctly |
301 | */ | |
302 | ||
159a8e92 | 303 | static int pty_resize(struct tty_struct *tty, struct winsize *ws) |
fc6f6238 AC |
304 | { |
305 | struct pid *pgrp, *rpgrp; | |
fc6f6238 AC |
306 | struct tty_struct *pty = tty->link; |
307 | ||
308 | /* For a PTY we need to lock the tty side */ | |
dee4a0be | 309 | mutex_lock(&tty->winsize_mutex); |
fc6f6238 AC |
310 | if (!memcmp(ws, &tty->winsize, sizeof(*ws))) |
311 | goto done; | |
312 | ||
5b239542 PH |
313 | /* Signal the foreground process group of both ptys */ |
314 | pgrp = tty_get_pgrp(tty); | |
315 | rpgrp = tty_get_pgrp(pty); | |
fc6f6238 AC |
316 | |
317 | if (pgrp) | |
318 | kill_pgrp(pgrp, SIGWINCH, 1); | |
319 | if (rpgrp != pgrp && rpgrp) | |
320 | kill_pgrp(rpgrp, SIGWINCH, 1); | |
321 | ||
322 | put_pid(pgrp); | |
323 | put_pid(rpgrp); | |
324 | ||
325 | tty->winsize = *ws; | |
326 | pty->winsize = *ws; /* Never used so will go away soon */ | |
327 | done: | |
dee4a0be | 328 | mutex_unlock(&tty->winsize_mutex); |
fc6f6238 AC |
329 | return 0; |
330 | } | |
331 | ||
01adc807 PH |
332 | /** |
333 | * pty_start - start() handler | |
334 | * pty_stop - stop() handler | |
335 | * @tty: tty being flow-controlled | |
336 | * | |
337 | * Propagates the TIOCPKT status to the master pty. | |
338 | * | |
339 | * NB: only the master pty can be in packet mode so only the slave | |
340 | * needs start()/stop() handlers | |
341 | */ | |
342 | static void pty_start(struct tty_struct *tty) | |
343 | { | |
344 | unsigned long flags; | |
345 | ||
346 | spin_lock_irqsave(&tty->ctrl_lock, flags); | |
347 | if (tty->link && tty->link->packet) { | |
348 | tty->ctrl_status &= ~TIOCPKT_STOP; | |
349 | tty->ctrl_status |= TIOCPKT_START; | |
350 | wake_up_interruptible_poll(&tty->link->read_wait, POLLIN); | |
351 | } | |
352 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); | |
353 | } | |
354 | ||
355 | static void pty_stop(struct tty_struct *tty) | |
356 | { | |
357 | unsigned long flags; | |
358 | ||
359 | spin_lock_irqsave(&tty->ctrl_lock, flags); | |
360 | if (tty->link && tty->link->packet) { | |
361 | tty->ctrl_status &= ~TIOCPKT_START; | |
362 | tty->ctrl_status |= TIOCPKT_STOP; | |
363 | wake_up_interruptible_poll(&tty->link->read_wait, POLLIN); | |
364 | } | |
365 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); | |
366 | } | |
367 | ||
d155255a AC |
368 | /** |
369 | * pty_common_install - set up the pty pair | |
370 | * @driver: the pty driver | |
371 | * @tty: the tty being instantiated | |
2c964a2f | 372 | * @legacy: true if this is BSD style |
d155255a AC |
373 | * |
374 | * Perform the initial set up for the tty/pty pair. Called from the | |
375 | * tty layer when the port is first opened. | |
376 | * | |
377 | * Locking: the caller must hold the tty_mutex | |
378 | */ | |
5d249bc6 JS |
379 | static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty, |
380 | bool legacy) | |
bf970ee4 AC |
381 | { |
382 | struct tty_struct *o_tty; | |
d03702a2 | 383 | struct tty_port *ports[2]; |
bf970ee4 | 384 | int idx = tty->index; |
5d249bc6 | 385 | int retval = -ENOMEM; |
bf970ee4 | 386 | |
d03702a2 JS |
387 | ports[0] = kmalloc(sizeof **ports, GFP_KERNEL); |
388 | ports[1] = kmalloc(sizeof **ports, GFP_KERNEL); | |
6f9ea7ad | 389 | if (!ports[0] || !ports[1]) |
2c964a2f | 390 | goto err; |
bf970ee4 AC |
391 | if (!try_module_get(driver->other->owner)) { |
392 | /* This cannot in fact currently happen */ | |
2c964a2f | 393 | goto err; |
bf970ee4 | 394 | } |
2c964a2f RV |
395 | o_tty = alloc_tty_struct(driver->other, idx); |
396 | if (!o_tty) | |
397 | goto err_put_module; | |
bf970ee4 | 398 | |
5d249bc6 JS |
399 | if (legacy) { |
400 | /* We always use new tty termios data so we can do this | |
401 | the easy way .. */ | |
402 | retval = tty_init_termios(tty); | |
403 | if (retval) | |
404 | goto err_deinit_tty; | |
405 | ||
406 | retval = tty_init_termios(o_tty); | |
407 | if (retval) | |
408 | goto err_free_termios; | |
409 | ||
410 | driver->other->ttys[idx] = o_tty; | |
411 | driver->ttys[idx] = tty; | |
412 | } else { | |
adc8d746 AC |
413 | memset(&tty->termios_locked, 0, sizeof(tty->termios_locked)); |
414 | tty->termios = driver->init_termios; | |
415 | memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked)); | |
416 | o_tty->termios = driver->other->init_termios; | |
5d249bc6 | 417 | } |
fe9cd962 | 418 | |
bf970ee4 AC |
419 | /* |
420 | * Everything allocated ... set up the o_tty structure. | |
421 | */ | |
bf970ee4 AC |
422 | tty_driver_kref_get(driver->other); |
423 | if (driver->subtype == PTY_TYPE_MASTER) | |
424 | o_tty->count++; | |
425 | /* Establish the links in both directions */ | |
426 | tty->link = o_tty; | |
427 | o_tty->link = tty; | |
d03702a2 JS |
428 | tty_port_init(ports[0]); |
429 | tty_port_init(ports[1]); | |
430 | o_tty->port = ports[0]; | |
431 | tty->port = ports[1]; | |
967fab69 | 432 | o_tty->port->itty = o_tty; |
bf970ee4 AC |
433 | |
434 | tty_driver_kref_get(driver); | |
435 | tty->count++; | |
bf970ee4 | 436 | return 0; |
8a1b8d70 | 437 | err_free_termios: |
5d249bc6 JS |
438 | if (legacy) |
439 | tty_free_termios(tty); | |
a9dccddb JS |
440 | err_deinit_tty: |
441 | deinitialize_tty_struct(o_tty); | |
2c964a2f RV |
442 | free_tty_struct(o_tty); |
443 | err_put_module: | |
07584d4a | 444 | module_put(driver->other->owner); |
2c964a2f | 445 | err: |
d03702a2 JS |
446 | kfree(ports[0]); |
447 | kfree(ports[1]); | |
8a1b8d70 | 448 | return retval; |
bf970ee4 AC |
449 | } |
450 | ||
d03702a2 JS |
451 | static void pty_cleanup(struct tty_struct *tty) |
452 | { | |
81c79838 | 453 | tty_port_put(tty->port); |
d03702a2 JS |
454 | } |
455 | ||
5d249bc6 JS |
456 | /* Traditional BSD devices */ |
457 | #ifdef CONFIG_LEGACY_PTYS | |
458 | ||
459 | static int pty_install(struct tty_driver *driver, struct tty_struct *tty) | |
460 | { | |
461 | return pty_common_install(driver, tty, true); | |
462 | } | |
463 | ||
d155255a AC |
464 | static void pty_remove(struct tty_driver *driver, struct tty_struct *tty) |
465 | { | |
466 | struct tty_struct *pair = tty->link; | |
467 | driver->ttys[tty->index] = NULL; | |
468 | if (pair) | |
469 | pair->driver->ttys[pair->index] = NULL; | |
470 | } | |
471 | ||
6caa76b7 | 472 | static int pty_bsd_ioctl(struct tty_struct *tty, |
1da177e4 LT |
473 | unsigned int cmd, unsigned long arg) |
474 | { | |
475 | switch (cmd) { | |
476 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
477 | return pty_set_lock(tty, (int __user *) arg); | |
84fd7bdf CG |
478 | case TIOCGPTLCK: /* Get PT Lock status */ |
479 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
480 | case TIOCPKT: /* Set PT packet mode */ |
481 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
482 | case TIOCGPKT: /* Get PT packet mode */ |
483 | return pty_get_pktmode(tty, (int __user *)arg); | |
26df6d13 | 484 | case TIOCSIG: /* Send signal to other side of pty */ |
485 | return pty_signal(tty, (int) arg); | |
ded2f295 JS |
486 | case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */ |
487 | return -EINVAL; | |
1da177e4 LT |
488 | } |
489 | return -ENOIOCTLCMD; | |
490 | } | |
491 | ||
dc8c8587 KS |
492 | static int legacy_count = CONFIG_LEGACY_PTY_COUNT; |
493 | module_param(legacy_count, int, 0); | |
494 | ||
342a5971 LT |
495 | /* |
496 | * The master side of a pty can do TIOCSPTLCK and thus | |
497 | * has pty_bsd_ioctl. | |
498 | */ | |
499 | static const struct tty_operations master_pty_ops_bsd = { | |
500 | .install = pty_install, | |
3e8e88ca AC |
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, | |
3e8e88ca | 508 | .ioctl = pty_bsd_ioctl, |
d03702a2 | 509 | .cleanup = pty_cleanup, |
d155255a AC |
510 | .resize = pty_resize, |
511 | .remove = pty_remove | |
3e8e88ca AC |
512 | }; |
513 | ||
342a5971 LT |
514 | static const struct tty_operations slave_pty_ops_bsd = { |
515 | .install = pty_install, | |
516 | .open = pty_open, | |
517 | .close = pty_close, | |
518 | .write = pty_write, | |
519 | .write_room = pty_write_room, | |
520 | .flush_buffer = pty_flush_buffer, | |
521 | .chars_in_buffer = pty_chars_in_buffer, | |
522 | .unthrottle = pty_unthrottle, | |
523 | .set_termios = pty_set_termios, | |
d03702a2 | 524 | .cleanup = pty_cleanup, |
d155255a | 525 | .resize = pty_resize, |
01adc807 PH |
526 | .start = pty_start, |
527 | .stop = pty_stop, | |
d155255a | 528 | .remove = pty_remove |
342a5971 LT |
529 | }; |
530 | ||
1da177e4 LT |
531 | static void __init legacy_pty_init(void) |
532 | { | |
342a5971 LT |
533 | struct tty_driver *pty_driver, *pty_slave_driver; |
534 | ||
dc8c8587 KS |
535 | if (legacy_count <= 0) |
536 | return; | |
1da177e4 | 537 | |
21aca2fa JS |
538 | pty_driver = tty_alloc_driver(legacy_count, |
539 | TTY_DRIVER_RESET_TERMIOS | | |
540 | TTY_DRIVER_REAL_RAW | | |
541 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 542 | if (IS_ERR(pty_driver)) |
1da177e4 LT |
543 | panic("Couldn't allocate pty driver"); |
544 | ||
21aca2fa JS |
545 | pty_slave_driver = tty_alloc_driver(legacy_count, |
546 | TTY_DRIVER_RESET_TERMIOS | | |
547 | TTY_DRIVER_REAL_RAW | | |
548 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 549 | if (IS_ERR(pty_slave_driver)) |
1da177e4 LT |
550 | panic("Couldn't allocate pty slave driver"); |
551 | ||
1da177e4 LT |
552 | pty_driver->driver_name = "pty_master"; |
553 | pty_driver->name = "pty"; | |
1da177e4 LT |
554 | pty_driver->major = PTY_MASTER_MAJOR; |
555 | pty_driver->minor_start = 0; | |
556 | pty_driver->type = TTY_DRIVER_TYPE_PTY; | |
557 | pty_driver->subtype = PTY_TYPE_MASTER; | |
558 | pty_driver->init_termios = tty_std_termios; | |
559 | pty_driver->init_termios.c_iflag = 0; | |
560 | pty_driver->init_termios.c_oflag = 0; | |
561 | pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
562 | pty_driver->init_termios.c_lflag = 0; | |
606d099c AC |
563 | pty_driver->init_termios.c_ispeed = 38400; |
564 | pty_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 565 | pty_driver->other = pty_slave_driver; |
342a5971 | 566 | tty_set_operations(pty_driver, &master_pty_ops_bsd); |
1da177e4 | 567 | |
1da177e4 LT |
568 | pty_slave_driver->driver_name = "pty_slave"; |
569 | pty_slave_driver->name = "ttyp"; | |
1da177e4 LT |
570 | pty_slave_driver->major = PTY_SLAVE_MAJOR; |
571 | pty_slave_driver->minor_start = 0; | |
572 | pty_slave_driver->type = TTY_DRIVER_TYPE_PTY; | |
573 | pty_slave_driver->subtype = PTY_TYPE_SLAVE; | |
574 | pty_slave_driver->init_termios = tty_std_termios; | |
575 | pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
576 | pty_slave_driver->init_termios.c_ispeed = 38400; |
577 | pty_slave_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 578 | pty_slave_driver->other = pty_driver; |
342a5971 | 579 | tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd); |
1da177e4 LT |
580 | |
581 | if (tty_register_driver(pty_driver)) | |
582 | panic("Couldn't register pty driver"); | |
583 | if (tty_register_driver(pty_slave_driver)) | |
584 | panic("Couldn't register pty slave driver"); | |
585 | } | |
586 | #else | |
587 | static inline void legacy_pty_init(void) { } | |
588 | #endif | |
589 | ||
590 | /* Unix98 devices */ | |
591 | #ifdef CONFIG_UNIX98_PTYS | |
1da177e4 | 592 | |
d81ed103 AC |
593 | static struct cdev ptmx_cdev; |
594 | ||
6caa76b7 | 595 | static int pty_unix98_ioctl(struct tty_struct *tty, |
1da177e4 LT |
596 | unsigned int cmd, unsigned long arg) |
597 | { | |
598 | switch (cmd) { | |
599 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
600 | return pty_set_lock(tty, (int __user *)arg); | |
84fd7bdf CG |
601 | case TIOCGPTLCK: /* Get PT Lock status */ |
602 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
603 | case TIOCPKT: /* Set PT packet mode */ |
604 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
605 | case TIOCGPKT: /* Get PT packet mode */ |
606 | return pty_get_pktmode(tty, (int __user *)arg); | |
1da177e4 LT |
607 | case TIOCGPTN: /* Get PT Number */ |
608 | return put_user(tty->index, (unsigned int __user *)arg); | |
26df6d13 | 609 | case TIOCSIG: /* Send signal to other side of pty */ |
610 | return pty_signal(tty, (int) arg); | |
1da177e4 LT |
611 | } |
612 | ||
613 | return -ENOIOCTLCMD; | |
614 | } | |
615 | ||
99f1fe18 AC |
616 | /** |
617 | * ptm_unix98_lookup - find a pty master | |
618 | * @driver: ptm driver | |
619 | * @idx: tty index | |
620 | * | |
621 | * Look up a pty master device. Called under the tty_mutex for now. | |
622 | * This provides our locking. | |
623 | */ | |
624 | ||
15f1a633 SB |
625 | static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, |
626 | struct inode *ptm_inode, int idx) | |
99f1fe18 | 627 | { |
593a27c4 KK |
628 | /* Master must be open via /dev/ptmx */ |
629 | return ERR_PTR(-EIO); | |
99f1fe18 AC |
630 | } |
631 | ||
632 | /** | |
633 | * pts_unix98_lookup - find a pty slave | |
634 | * @driver: pts driver | |
635 | * @idx: tty index | |
636 | * | |
637 | * Look up a pty master device. Called under the tty_mutex for now. | |
d739e65b | 638 | * This provides our locking for the tty pointer. |
99f1fe18 AC |
639 | */ |
640 | ||
15f1a633 SB |
641 | static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver, |
642 | struct inode *pts_inode, int idx) | |
99f1fe18 | 643 | { |
d739e65b AC |
644 | struct tty_struct *tty; |
645 | ||
646 | mutex_lock(&devpts_mutex); | |
8fcbaa2b | 647 | tty = devpts_get_priv(pts_inode); |
d739e65b | 648 | mutex_unlock(&devpts_mutex); |
99f1fe18 AC |
649 | /* Master must be open before slave */ |
650 | if (!tty) | |
651 | return ERR_PTR(-EIO); | |
652 | return tty; | |
653 | } | |
654 | ||
8b0a88d5 AC |
655 | /* We have no need to install and remove our tty objects as devpts does all |
656 | the work for us */ | |
657 | ||
bf970ee4 | 658 | static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty) |
8b0a88d5 | 659 | { |
5d249bc6 | 660 | return pty_common_install(driver, tty, false); |
8b0a88d5 AC |
661 | } |
662 | ||
7171604a | 663 | static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty) |
8b0a88d5 AC |
664 | { |
665 | } | |
666 | ||
f4b208eb JS |
667 | /* this is called once with whichever end is closed last */ |
668 | static void pty_unix98_shutdown(struct tty_struct *tty) | |
669 | { | |
670 | devpts_kill_index(tty->driver_data, tty->index); | |
671 | } | |
672 | ||
feebed65 | 673 | static const struct tty_operations ptm_unix98_ops = { |
99f1fe18 | 674 | .lookup = ptm_unix98_lookup, |
bf970ee4 | 675 | .install = pty_unix98_install, |
7171604a | 676 | .remove = pty_unix98_remove, |
3e8e88ca AC |
677 | .open = pty_open, |
678 | .close = pty_close, | |
679 | .write = pty_write, | |
680 | .write_room = pty_write_room, | |
681 | .flush_buffer = pty_flush_buffer, | |
682 | .chars_in_buffer = pty_chars_in_buffer, | |
683 | .unthrottle = pty_unthrottle, | |
feebed65 | 684 | .ioctl = pty_unix98_ioctl, |
36b3c070 | 685 | .resize = pty_resize, |
fa2ecfc5 | 686 | .shutdown = pty_unix98_shutdown, |
36b3c070 | 687 | .cleanup = pty_cleanup |
3e8e88ca AC |
688 | }; |
689 | ||
99f1fe18 AC |
690 | static const struct tty_operations pty_unix98_ops = { |
691 | .lookup = pts_unix98_lookup, | |
bf970ee4 | 692 | .install = pty_unix98_install, |
7171604a | 693 | .remove = pty_unix98_remove, |
99f1fe18 AC |
694 | .open = pty_open, |
695 | .close = pty_close, | |
696 | .write = pty_write, | |
697 | .write_room = pty_write_room, | |
698 | .flush_buffer = pty_flush_buffer, | |
699 | .chars_in_buffer = pty_chars_in_buffer, | |
700 | .unthrottle = pty_unthrottle, | |
701 | .set_termios = pty_set_termios, | |
01adc807 PH |
702 | .start = pty_start, |
703 | .stop = pty_stop, | |
fa2ecfc5 | 704 | .shutdown = pty_unix98_shutdown, |
d03702a2 | 705 | .cleanup = pty_cleanup, |
99f1fe18 | 706 | }; |
d81ed103 AC |
707 | |
708 | /** | |
709 | * ptmx_open - open a unix 98 pty master | |
710 | * @inode: inode of device file | |
711 | * @filp: file pointer to tty | |
712 | * | |
713 | * Allocate a unix98 pty master device from the ptmx driver. | |
714 | * | |
715 | * Locking: tty_mutex protects the init_dev work. tty->count should | |
b9f8033f | 716 | * protect the rest. |
d81ed103 AC |
717 | * allocated_ptys_lock handles the list of free pty numbers |
718 | */ | |
719 | ||
64ba3dc3 | 720 | static int ptmx_open(struct inode *inode, struct file *filp) |
d81ed103 AC |
721 | { |
722 | struct tty_struct *tty; | |
162b97cf | 723 | struct inode *slave_inode; |
d81ed103 AC |
724 | int retval; |
725 | int index; | |
726 | ||
727 | nonseekable_open(inode, filp); | |
728 | ||
b0b88565 LT |
729 | /* We refuse fsnotify events on ptmx, since it's a shared resource */ |
730 | filp->f_mode |= FMODE_NONOTIFY; | |
731 | ||
fa90e1c9 JS |
732 | retval = tty_alloc_file(filp); |
733 | if (retval) | |
734 | return retval; | |
735 | ||
d81ed103 | 736 | /* find a device that is not in use. */ |
89c8d91e | 737 | mutex_lock(&devpts_mutex); |
15f1a633 | 738 | index = devpts_new_index(inode); |
fa90e1c9 JS |
739 | if (index < 0) { |
740 | retval = index; | |
05fb79e4 | 741 | mutex_unlock(&devpts_mutex); |
fa90e1c9 JS |
742 | goto err_file; |
743 | } | |
d81ed103 | 744 | |
89c8d91e AC |
745 | mutex_unlock(&devpts_mutex); |
746 | ||
d81ed103 | 747 | mutex_lock(&tty_mutex); |
593a27c4 | 748 | tty = tty_init_dev(ptm_driver, index); |
d81ed103 | 749 | |
73ec06fc AC |
750 | if (IS_ERR(tty)) { |
751 | retval = PTR_ERR(tty); | |
d81ed103 | 752 | goto out; |
73ec06fc | 753 | } |
d81ed103 | 754 | |
89c8d91e AC |
755 | /* The tty returned here is locked so we can safely |
756 | drop the mutex */ | |
757 | mutex_unlock(&tty_mutex); | |
758 | ||
d81ed103 | 759 | set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ |
7acf6cd8 | 760 | tty->driver_data = inode; |
ee2ffa0d | 761 | |
fa90e1c9 | 762 | tty_add_file(tty, filp); |
d81ed103 | 763 | |
f11afb61 JS |
764 | slave_inode = devpts_pty_new(inode, |
765 | MKDEV(UNIX98_PTY_SLAVE_MAJOR, index), index, | |
766 | tty->link); | |
162b97cf JS |
767 | if (IS_ERR(slave_inode)) { |
768 | retval = PTR_ERR(slave_inode); | |
1177c0ef | 769 | goto err_release; |
162b97cf | 770 | } |
7acf6cd8 | 771 | tty->link->driver_data = slave_inode; |
d81ed103 AC |
772 | |
773 | retval = ptm_driver->ops->open(tty, filp); | |
64ba3dc3 | 774 | if (retval) |
1177c0ef JS |
775 | goto err_release; |
776 | ||
89c8d91e | 777 | tty_unlock(tty); |
1177c0ef JS |
778 | return 0; |
779 | err_release: | |
89c8d91e | 780 | tty_unlock(tty); |
eeb89d91 | 781 | tty_release(inode, filp); |
d81ed103 AC |
782 | return retval; |
783 | out: | |
89c8d91e | 784 | mutex_unlock(&tty_mutex); |
d3bda529 | 785 | devpts_kill_index(inode, index); |
fa90e1c9 JS |
786 | err_file: |
787 | tty_free_file(filp); | |
64ba3dc3 | 788 | return retval; |
d81ed103 AC |
789 | } |
790 | ||
791 | static struct file_operations ptmx_fops; | |
792 | ||
1da177e4 LT |
793 | static void __init unix98_pty_init(void) |
794 | { | |
21aca2fa JS |
795 | ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
796 | TTY_DRIVER_RESET_TERMIOS | | |
797 | TTY_DRIVER_REAL_RAW | | |
798 | TTY_DRIVER_DYNAMIC_DEV | | |
799 | TTY_DRIVER_DEVPTS_MEM | | |
800 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 801 | if (IS_ERR(ptm_driver)) |
1da177e4 | 802 | panic("Couldn't allocate Unix98 ptm driver"); |
21aca2fa JS |
803 | pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
804 | TTY_DRIVER_RESET_TERMIOS | | |
805 | TTY_DRIVER_REAL_RAW | | |
806 | TTY_DRIVER_DYNAMIC_DEV | | |
807 | TTY_DRIVER_DEVPTS_MEM | | |
808 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 809 | if (IS_ERR(pts_driver)) |
1da177e4 LT |
810 | panic("Couldn't allocate Unix98 pts driver"); |
811 | ||
1da177e4 LT |
812 | ptm_driver->driver_name = "pty_master"; |
813 | ptm_driver->name = "ptm"; | |
814 | ptm_driver->major = UNIX98_PTY_MASTER_MAJOR; | |
815 | ptm_driver->minor_start = 0; | |
816 | ptm_driver->type = TTY_DRIVER_TYPE_PTY; | |
817 | ptm_driver->subtype = PTY_TYPE_MASTER; | |
818 | ptm_driver->init_termios = tty_std_termios; | |
819 | ptm_driver->init_termios.c_iflag = 0; | |
820 | ptm_driver->init_termios.c_oflag = 0; | |
821 | ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
822 | ptm_driver->init_termios.c_lflag = 0; | |
606d099c AC |
823 | ptm_driver->init_termios.c_ispeed = 38400; |
824 | ptm_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 825 | ptm_driver->other = pts_driver; |
feebed65 | 826 | tty_set_operations(ptm_driver, &ptm_unix98_ops); |
1da177e4 | 827 | |
1da177e4 LT |
828 | pts_driver->driver_name = "pty_slave"; |
829 | pts_driver->name = "pts"; | |
830 | pts_driver->major = UNIX98_PTY_SLAVE_MAJOR; | |
831 | pts_driver->minor_start = 0; | |
832 | pts_driver->type = TTY_DRIVER_TYPE_PTY; | |
833 | pts_driver->subtype = PTY_TYPE_SLAVE; | |
834 | pts_driver->init_termios = tty_std_termios; | |
835 | pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
836 | pts_driver->init_termios.c_ispeed = 38400; |
837 | pts_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 838 | pts_driver->other = ptm_driver; |
99f1fe18 | 839 | tty_set_operations(pts_driver, &pty_unix98_ops); |
fe9cd962 | 840 | |
1da177e4 LT |
841 | if (tty_register_driver(ptm_driver)) |
842 | panic("Couldn't register Unix98 ptm driver"); | |
843 | if (tty_register_driver(pts_driver)) | |
844 | panic("Couldn't register Unix98 pts driver"); | |
845 | ||
d81ed103 AC |
846 | /* Now create the /dev/ptmx special device */ |
847 | tty_default_fops(&ptmx_fops); | |
848 | ptmx_fops.open = ptmx_open; | |
849 | ||
850 | cdev_init(&ptmx_cdev, &ptmx_fops); | |
851 | if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) || | |
852 | register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0) | |
82f8c35f | 853 | panic("Couldn't register /dev/ptmx driver"); |
d81ed103 | 854 | device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); |
1da177e4 | 855 | } |
d81ed103 | 856 | |
1da177e4 LT |
857 | #else |
858 | static inline void unix98_pty_init(void) { } | |
859 | #endif | |
860 | ||
861 | static int __init pty_init(void) | |
862 | { | |
863 | legacy_pty_init(); | |
864 | unix98_pty_init(); | |
865 | return 0; | |
866 | } | |
867 | module_init(pty_init); |