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 | { | |
06026d91 CG |
181 | int pktmode; |
182 | ||
183 | if (get_user(pktmode, arg)) | |
184 | return -EFAULT; | |
185 | ||
6054c16e | 186 | spin_lock_irq(&tty->ctrl_lock); |
06026d91 CG |
187 | if (pktmode) { |
188 | if (!tty->packet) { | |
189 | tty->packet = 1; | |
190 | tty->link->ctrl_status = 0; | |
191 | } | |
192 | } else | |
193 | tty->packet = 0; | |
6054c16e | 194 | spin_unlock_irq(&tty->ctrl_lock); |
06026d91 CG |
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 | { | |
26df6d13 | 209 | struct pid *pgrp; |
210 | ||
211 | if (tty->link) { | |
5b239542 PH |
212 | pgrp = tty_get_pgrp(tty->link); |
213 | if (pgrp) | |
214 | kill_pgrp(pgrp, sig, 1); | |
26df6d13 | 215 | put_pid(pgrp); |
216 | } | |
217 | return 0; | |
218 | } | |
219 | ||
1da177e4 LT |
220 | static void pty_flush_buffer(struct tty_struct *tty) |
221 | { | |
222 | struct tty_struct *to = tty->link; | |
fe9cd962 | 223 | |
1da177e4 LT |
224 | if (!to) |
225 | return; | |
d945cb9c | 226 | /* tty_buffer_flush(to); FIXME */ |
1da177e4 | 227 | if (to->packet) { |
6054c16e | 228 | spin_lock_irq(&tty->ctrl_lock); |
1da177e4 LT |
229 | tty->ctrl_status |= TIOCPKT_FLUSHWRITE; |
230 | wake_up_interruptible(&to->read_wait); | |
6054c16e | 231 | spin_unlock_irq(&tty->ctrl_lock); |
1da177e4 LT |
232 | } |
233 | } | |
234 | ||
fe9cd962 | 235 | static int pty_open(struct tty_struct *tty, struct file *filp) |
1da177e4 | 236 | { |
1da177e4 | 237 | if (!tty || !tty->link) |
7c61c3d8 | 238 | return -ENODEV; |
69939035 | 239 | |
1da177e4 LT |
240 | if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) |
241 | goto out; | |
242 | if (test_bit(TTY_PTY_LOCK, &tty->link->flags)) | |
243 | goto out; | |
80cace72 | 244 | if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1) |
1da177e4 LT |
245 | goto out; |
246 | ||
69939035 | 247 | clear_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
248 | clear_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
249 | set_bit(TTY_THROTTLED, &tty->flags); | |
7c61c3d8 PH |
250 | return 0; |
251 | ||
1da177e4 | 252 | out: |
7c61c3d8 PH |
253 | set_bit(TTY_IO_ERROR, &tty->flags); |
254 | return -EIO; | |
1da177e4 LT |
255 | } |
256 | ||
fe9cd962 AC |
257 | static void pty_set_termios(struct tty_struct *tty, |
258 | struct ktermios *old_termios) | |
1da177e4 | 259 | { |
dbfcd851 PH |
260 | /* See if packet mode change of state. */ |
261 | if (tty->link && tty->link->packet) { | |
262 | int extproc = (old_termios->c_lflag & EXTPROC) | | |
263 | (tty->termios.c_lflag & EXTPROC); | |
264 | int old_flow = ((old_termios->c_iflag & IXON) && | |
265 | (old_termios->c_cc[VSTOP] == '\023') && | |
266 | (old_termios->c_cc[VSTART] == '\021')); | |
267 | int new_flow = (I_IXON(tty) && | |
268 | STOP_CHAR(tty) == '\023' && | |
269 | START_CHAR(tty) == '\021'); | |
270 | if ((old_flow != new_flow) || extproc) { | |
4d8c1dff | 271 | spin_lock_irq(&tty->ctrl_lock); |
dbfcd851 PH |
272 | if (old_flow != new_flow) { |
273 | tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); | |
274 | if (new_flow) | |
275 | tty->ctrl_status |= TIOCPKT_DOSTOP; | |
276 | else | |
277 | tty->ctrl_status |= TIOCPKT_NOSTOP; | |
278 | } | |
279 | if (extproc) | |
280 | tty->ctrl_status |= TIOCPKT_IOCTL; | |
4d8c1dff | 281 | spin_unlock_irq(&tty->ctrl_lock); |
dbfcd851 PH |
282 | wake_up_interruptible(&tty->link->read_wait); |
283 | } | |
284 | } | |
285 | ||
adc8d746 AC |
286 | tty->termios.c_cflag &= ~(CSIZE | PARENB); |
287 | tty->termios.c_cflag |= (CS8 | CREAD); | |
1da177e4 LT |
288 | } |
289 | ||
fc6f6238 AC |
290 | /** |
291 | * pty_do_resize - resize event | |
292 | * @tty: tty being resized | |
c774bda2 | 293 | * @ws: window size being set. |
fc6f6238 | 294 | * |
3ad2f3fb | 295 | * Update the termios variables and send the necessary signals to |
fc6f6238 AC |
296 | * peform a terminal resize correctly |
297 | */ | |
298 | ||
159a8e92 | 299 | static int pty_resize(struct tty_struct *tty, struct winsize *ws) |
fc6f6238 AC |
300 | { |
301 | struct pid *pgrp, *rpgrp; | |
fc6f6238 AC |
302 | struct tty_struct *pty = tty->link; |
303 | ||
304 | /* For a PTY we need to lock the tty side */ | |
dee4a0be | 305 | mutex_lock(&tty->winsize_mutex); |
fc6f6238 AC |
306 | if (!memcmp(ws, &tty->winsize, sizeof(*ws))) |
307 | goto done; | |
308 | ||
5b239542 PH |
309 | /* Signal the foreground process group of both ptys */ |
310 | pgrp = tty_get_pgrp(tty); | |
311 | rpgrp = tty_get_pgrp(pty); | |
fc6f6238 AC |
312 | |
313 | if (pgrp) | |
314 | kill_pgrp(pgrp, SIGWINCH, 1); | |
315 | if (rpgrp != pgrp && rpgrp) | |
316 | kill_pgrp(rpgrp, SIGWINCH, 1); | |
317 | ||
318 | put_pid(pgrp); | |
319 | put_pid(rpgrp); | |
320 | ||
321 | tty->winsize = *ws; | |
322 | pty->winsize = *ws; /* Never used so will go away soon */ | |
323 | done: | |
dee4a0be | 324 | mutex_unlock(&tty->winsize_mutex); |
fc6f6238 AC |
325 | return 0; |
326 | } | |
327 | ||
01adc807 PH |
328 | /** |
329 | * pty_start - start() handler | |
330 | * pty_stop - stop() handler | |
331 | * @tty: tty being flow-controlled | |
332 | * | |
333 | * Propagates the TIOCPKT status to the master pty. | |
334 | * | |
335 | * NB: only the master pty can be in packet mode so only the slave | |
336 | * needs start()/stop() handlers | |
337 | */ | |
338 | static void pty_start(struct tty_struct *tty) | |
339 | { | |
340 | unsigned long flags; | |
341 | ||
342 | spin_lock_irqsave(&tty->ctrl_lock, flags); | |
343 | if (tty->link && tty->link->packet) { | |
344 | tty->ctrl_status &= ~TIOCPKT_STOP; | |
345 | tty->ctrl_status |= TIOCPKT_START; | |
346 | wake_up_interruptible_poll(&tty->link->read_wait, POLLIN); | |
347 | } | |
348 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); | |
349 | } | |
350 | ||
351 | static void pty_stop(struct tty_struct *tty) | |
352 | { | |
353 | unsigned long flags; | |
354 | ||
355 | spin_lock_irqsave(&tty->ctrl_lock, flags); | |
356 | if (tty->link && tty->link->packet) { | |
357 | tty->ctrl_status &= ~TIOCPKT_START; | |
358 | tty->ctrl_status |= TIOCPKT_STOP; | |
359 | wake_up_interruptible_poll(&tty->link->read_wait, POLLIN); | |
360 | } | |
361 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); | |
362 | } | |
363 | ||
d155255a AC |
364 | /** |
365 | * pty_common_install - set up the pty pair | |
366 | * @driver: the pty driver | |
367 | * @tty: the tty being instantiated | |
2c964a2f | 368 | * @legacy: true if this is BSD style |
d155255a AC |
369 | * |
370 | * Perform the initial set up for the tty/pty pair. Called from the | |
371 | * tty layer when the port is first opened. | |
372 | * | |
373 | * Locking: the caller must hold the tty_mutex | |
374 | */ | |
5d249bc6 JS |
375 | static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty, |
376 | bool legacy) | |
bf970ee4 AC |
377 | { |
378 | struct tty_struct *o_tty; | |
d03702a2 | 379 | struct tty_port *ports[2]; |
bf970ee4 | 380 | int idx = tty->index; |
5d249bc6 | 381 | int retval = -ENOMEM; |
bf970ee4 | 382 | |
d03702a2 JS |
383 | ports[0] = kmalloc(sizeof **ports, GFP_KERNEL); |
384 | ports[1] = kmalloc(sizeof **ports, GFP_KERNEL); | |
6f9ea7ad | 385 | if (!ports[0] || !ports[1]) |
2c964a2f | 386 | goto err; |
bf970ee4 AC |
387 | if (!try_module_get(driver->other->owner)) { |
388 | /* This cannot in fact currently happen */ | |
2c964a2f | 389 | goto err; |
bf970ee4 | 390 | } |
2c964a2f RV |
391 | o_tty = alloc_tty_struct(driver->other, idx); |
392 | if (!o_tty) | |
393 | goto err_put_module; | |
bf970ee4 | 394 | |
5d249bc6 JS |
395 | if (legacy) { |
396 | /* We always use new tty termios data so we can do this | |
397 | the easy way .. */ | |
398 | retval = tty_init_termios(tty); | |
399 | if (retval) | |
400 | goto err_deinit_tty; | |
401 | ||
402 | retval = tty_init_termios(o_tty); | |
403 | if (retval) | |
404 | goto err_free_termios; | |
405 | ||
406 | driver->other->ttys[idx] = o_tty; | |
407 | driver->ttys[idx] = tty; | |
408 | } else { | |
adc8d746 AC |
409 | memset(&tty->termios_locked, 0, sizeof(tty->termios_locked)); |
410 | tty->termios = driver->init_termios; | |
411 | memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked)); | |
412 | o_tty->termios = driver->other->init_termios; | |
5d249bc6 | 413 | } |
fe9cd962 | 414 | |
bf970ee4 AC |
415 | /* |
416 | * Everything allocated ... set up the o_tty structure. | |
417 | */ | |
bf970ee4 AC |
418 | tty_driver_kref_get(driver->other); |
419 | if (driver->subtype == PTY_TYPE_MASTER) | |
420 | o_tty->count++; | |
421 | /* Establish the links in both directions */ | |
422 | tty->link = o_tty; | |
423 | o_tty->link = tty; | |
d03702a2 JS |
424 | tty_port_init(ports[0]); |
425 | tty_port_init(ports[1]); | |
426 | o_tty->port = ports[0]; | |
427 | tty->port = ports[1]; | |
967fab69 | 428 | o_tty->port->itty = o_tty; |
bf970ee4 AC |
429 | |
430 | tty_driver_kref_get(driver); | |
431 | tty->count++; | |
bf970ee4 | 432 | return 0; |
8a1b8d70 | 433 | err_free_termios: |
5d249bc6 JS |
434 | if (legacy) |
435 | tty_free_termios(tty); | |
a9dccddb JS |
436 | err_deinit_tty: |
437 | deinitialize_tty_struct(o_tty); | |
2c964a2f RV |
438 | free_tty_struct(o_tty); |
439 | err_put_module: | |
07584d4a | 440 | module_put(driver->other->owner); |
2c964a2f | 441 | err: |
d03702a2 JS |
442 | kfree(ports[0]); |
443 | kfree(ports[1]); | |
8a1b8d70 | 444 | return retval; |
bf970ee4 AC |
445 | } |
446 | ||
d03702a2 JS |
447 | static void pty_cleanup(struct tty_struct *tty) |
448 | { | |
81c79838 | 449 | tty_port_put(tty->port); |
d03702a2 JS |
450 | } |
451 | ||
5d249bc6 JS |
452 | /* Traditional BSD devices */ |
453 | #ifdef CONFIG_LEGACY_PTYS | |
454 | ||
455 | static int pty_install(struct tty_driver *driver, struct tty_struct *tty) | |
456 | { | |
457 | return pty_common_install(driver, tty, true); | |
458 | } | |
459 | ||
d155255a AC |
460 | static void pty_remove(struct tty_driver *driver, struct tty_struct *tty) |
461 | { | |
462 | struct tty_struct *pair = tty->link; | |
463 | driver->ttys[tty->index] = NULL; | |
464 | if (pair) | |
465 | pair->driver->ttys[pair->index] = NULL; | |
466 | } | |
467 | ||
6caa76b7 | 468 | static int pty_bsd_ioctl(struct tty_struct *tty, |
1da177e4 LT |
469 | unsigned int cmd, unsigned long arg) |
470 | { | |
471 | switch (cmd) { | |
472 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
473 | return pty_set_lock(tty, (int __user *) arg); | |
84fd7bdf CG |
474 | case TIOCGPTLCK: /* Get PT Lock status */ |
475 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
476 | case TIOCPKT: /* Set PT packet mode */ |
477 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
478 | case TIOCGPKT: /* Get PT packet mode */ |
479 | return pty_get_pktmode(tty, (int __user *)arg); | |
26df6d13 | 480 | case TIOCSIG: /* Send signal to other side of pty */ |
481 | return pty_signal(tty, (int) arg); | |
ded2f295 JS |
482 | case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */ |
483 | return -EINVAL; | |
1da177e4 LT |
484 | } |
485 | return -ENOIOCTLCMD; | |
486 | } | |
487 | ||
dc8c8587 KS |
488 | static int legacy_count = CONFIG_LEGACY_PTY_COUNT; |
489 | module_param(legacy_count, int, 0); | |
490 | ||
342a5971 LT |
491 | /* |
492 | * The master side of a pty can do TIOCSPTLCK and thus | |
493 | * has pty_bsd_ioctl. | |
494 | */ | |
495 | static const struct tty_operations master_pty_ops_bsd = { | |
496 | .install = pty_install, | |
3e8e88ca AC |
497 | .open = pty_open, |
498 | .close = pty_close, | |
499 | .write = pty_write, | |
500 | .write_room = pty_write_room, | |
501 | .flush_buffer = pty_flush_buffer, | |
502 | .chars_in_buffer = pty_chars_in_buffer, | |
503 | .unthrottle = pty_unthrottle, | |
3e8e88ca | 504 | .ioctl = pty_bsd_ioctl, |
d03702a2 | 505 | .cleanup = pty_cleanup, |
d155255a AC |
506 | .resize = pty_resize, |
507 | .remove = pty_remove | |
3e8e88ca AC |
508 | }; |
509 | ||
342a5971 LT |
510 | static const struct tty_operations slave_pty_ops_bsd = { |
511 | .install = pty_install, | |
512 | .open = pty_open, | |
513 | .close = pty_close, | |
514 | .write = pty_write, | |
515 | .write_room = pty_write_room, | |
516 | .flush_buffer = pty_flush_buffer, | |
517 | .chars_in_buffer = pty_chars_in_buffer, | |
518 | .unthrottle = pty_unthrottle, | |
519 | .set_termios = pty_set_termios, | |
d03702a2 | 520 | .cleanup = pty_cleanup, |
d155255a | 521 | .resize = pty_resize, |
01adc807 PH |
522 | .start = pty_start, |
523 | .stop = pty_stop, | |
d155255a | 524 | .remove = pty_remove |
342a5971 LT |
525 | }; |
526 | ||
1da177e4 LT |
527 | static void __init legacy_pty_init(void) |
528 | { | |
342a5971 LT |
529 | struct tty_driver *pty_driver, *pty_slave_driver; |
530 | ||
dc8c8587 KS |
531 | if (legacy_count <= 0) |
532 | return; | |
1da177e4 | 533 | |
21aca2fa JS |
534 | pty_driver = tty_alloc_driver(legacy_count, |
535 | TTY_DRIVER_RESET_TERMIOS | | |
536 | TTY_DRIVER_REAL_RAW | | |
537 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 538 | if (IS_ERR(pty_driver)) |
1da177e4 LT |
539 | panic("Couldn't allocate pty driver"); |
540 | ||
21aca2fa JS |
541 | pty_slave_driver = tty_alloc_driver(legacy_count, |
542 | TTY_DRIVER_RESET_TERMIOS | | |
543 | TTY_DRIVER_REAL_RAW | | |
544 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 545 | if (IS_ERR(pty_slave_driver)) |
1da177e4 LT |
546 | panic("Couldn't allocate pty slave driver"); |
547 | ||
1da177e4 LT |
548 | pty_driver->driver_name = "pty_master"; |
549 | pty_driver->name = "pty"; | |
1da177e4 LT |
550 | pty_driver->major = PTY_MASTER_MAJOR; |
551 | pty_driver->minor_start = 0; | |
552 | pty_driver->type = TTY_DRIVER_TYPE_PTY; | |
553 | pty_driver->subtype = PTY_TYPE_MASTER; | |
554 | pty_driver->init_termios = tty_std_termios; | |
555 | pty_driver->init_termios.c_iflag = 0; | |
556 | pty_driver->init_termios.c_oflag = 0; | |
557 | pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
558 | pty_driver->init_termios.c_lflag = 0; | |
606d099c AC |
559 | pty_driver->init_termios.c_ispeed = 38400; |
560 | pty_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 561 | pty_driver->other = pty_slave_driver; |
342a5971 | 562 | tty_set_operations(pty_driver, &master_pty_ops_bsd); |
1da177e4 | 563 | |
1da177e4 LT |
564 | pty_slave_driver->driver_name = "pty_slave"; |
565 | pty_slave_driver->name = "ttyp"; | |
1da177e4 LT |
566 | pty_slave_driver->major = PTY_SLAVE_MAJOR; |
567 | pty_slave_driver->minor_start = 0; | |
568 | pty_slave_driver->type = TTY_DRIVER_TYPE_PTY; | |
569 | pty_slave_driver->subtype = PTY_TYPE_SLAVE; | |
570 | pty_slave_driver->init_termios = tty_std_termios; | |
571 | pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
572 | pty_slave_driver->init_termios.c_ispeed = 38400; |
573 | pty_slave_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 574 | pty_slave_driver->other = pty_driver; |
342a5971 | 575 | tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd); |
1da177e4 LT |
576 | |
577 | if (tty_register_driver(pty_driver)) | |
578 | panic("Couldn't register pty driver"); | |
579 | if (tty_register_driver(pty_slave_driver)) | |
580 | panic("Couldn't register pty slave driver"); | |
581 | } | |
582 | #else | |
583 | static inline void legacy_pty_init(void) { } | |
584 | #endif | |
585 | ||
586 | /* Unix98 devices */ | |
587 | #ifdef CONFIG_UNIX98_PTYS | |
1da177e4 | 588 | |
d81ed103 AC |
589 | static struct cdev ptmx_cdev; |
590 | ||
6caa76b7 | 591 | static int pty_unix98_ioctl(struct tty_struct *tty, |
1da177e4 LT |
592 | unsigned int cmd, unsigned long arg) |
593 | { | |
594 | switch (cmd) { | |
595 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
596 | return pty_set_lock(tty, (int __user *)arg); | |
84fd7bdf CG |
597 | case TIOCGPTLCK: /* Get PT Lock status */ |
598 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
599 | case TIOCPKT: /* Set PT packet mode */ |
600 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
601 | case TIOCGPKT: /* Get PT packet mode */ |
602 | return pty_get_pktmode(tty, (int __user *)arg); | |
1da177e4 LT |
603 | case TIOCGPTN: /* Get PT Number */ |
604 | return put_user(tty->index, (unsigned int __user *)arg); | |
26df6d13 | 605 | case TIOCSIG: /* Send signal to other side of pty */ |
606 | return pty_signal(tty, (int) arg); | |
1da177e4 LT |
607 | } |
608 | ||
609 | return -ENOIOCTLCMD; | |
610 | } | |
611 | ||
99f1fe18 AC |
612 | /** |
613 | * ptm_unix98_lookup - find a pty master | |
614 | * @driver: ptm driver | |
615 | * @idx: tty index | |
616 | * | |
617 | * Look up a pty master device. Called under the tty_mutex for now. | |
618 | * This provides our locking. | |
619 | */ | |
620 | ||
15f1a633 SB |
621 | static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, |
622 | struct inode *ptm_inode, int idx) | |
99f1fe18 | 623 | { |
593a27c4 KK |
624 | /* Master must be open via /dev/ptmx */ |
625 | return ERR_PTR(-EIO); | |
99f1fe18 AC |
626 | } |
627 | ||
628 | /** | |
629 | * pts_unix98_lookup - find a pty slave | |
630 | * @driver: pts driver | |
631 | * @idx: tty index | |
632 | * | |
633 | * Look up a pty master device. Called under the tty_mutex for now. | |
d739e65b | 634 | * This provides our locking for the tty pointer. |
99f1fe18 AC |
635 | */ |
636 | ||
15f1a633 SB |
637 | static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver, |
638 | struct inode *pts_inode, int idx) | |
99f1fe18 | 639 | { |
d739e65b AC |
640 | struct tty_struct *tty; |
641 | ||
642 | mutex_lock(&devpts_mutex); | |
8fcbaa2b | 643 | tty = devpts_get_priv(pts_inode); |
d739e65b | 644 | mutex_unlock(&devpts_mutex); |
99f1fe18 AC |
645 | /* Master must be open before slave */ |
646 | if (!tty) | |
647 | return ERR_PTR(-EIO); | |
648 | return tty; | |
649 | } | |
650 | ||
8b0a88d5 AC |
651 | /* We have no need to install and remove our tty objects as devpts does all |
652 | the work for us */ | |
653 | ||
bf970ee4 | 654 | static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty) |
8b0a88d5 | 655 | { |
5d249bc6 | 656 | return pty_common_install(driver, tty, false); |
8b0a88d5 AC |
657 | } |
658 | ||
7171604a | 659 | static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty) |
8b0a88d5 AC |
660 | { |
661 | } | |
662 | ||
f4b208eb JS |
663 | /* this is called once with whichever end is closed last */ |
664 | static void pty_unix98_shutdown(struct tty_struct *tty) | |
665 | { | |
666 | devpts_kill_index(tty->driver_data, tty->index); | |
667 | } | |
668 | ||
feebed65 | 669 | static const struct tty_operations ptm_unix98_ops = { |
99f1fe18 | 670 | .lookup = ptm_unix98_lookup, |
bf970ee4 | 671 | .install = pty_unix98_install, |
7171604a | 672 | .remove = pty_unix98_remove, |
3e8e88ca AC |
673 | .open = pty_open, |
674 | .close = pty_close, | |
675 | .write = pty_write, | |
676 | .write_room = pty_write_room, | |
677 | .flush_buffer = pty_flush_buffer, | |
678 | .chars_in_buffer = pty_chars_in_buffer, | |
679 | .unthrottle = pty_unthrottle, | |
feebed65 | 680 | .ioctl = pty_unix98_ioctl, |
36b3c070 | 681 | .resize = pty_resize, |
fa2ecfc5 | 682 | .shutdown = pty_unix98_shutdown, |
36b3c070 | 683 | .cleanup = pty_cleanup |
3e8e88ca AC |
684 | }; |
685 | ||
99f1fe18 AC |
686 | static const struct tty_operations pty_unix98_ops = { |
687 | .lookup = pts_unix98_lookup, | |
bf970ee4 | 688 | .install = pty_unix98_install, |
7171604a | 689 | .remove = pty_unix98_remove, |
99f1fe18 AC |
690 | .open = pty_open, |
691 | .close = pty_close, | |
692 | .write = pty_write, | |
693 | .write_room = pty_write_room, | |
694 | .flush_buffer = pty_flush_buffer, | |
695 | .chars_in_buffer = pty_chars_in_buffer, | |
696 | .unthrottle = pty_unthrottle, | |
697 | .set_termios = pty_set_termios, | |
01adc807 PH |
698 | .start = pty_start, |
699 | .stop = pty_stop, | |
fa2ecfc5 | 700 | .shutdown = pty_unix98_shutdown, |
d03702a2 | 701 | .cleanup = pty_cleanup, |
99f1fe18 | 702 | }; |
d81ed103 AC |
703 | |
704 | /** | |
705 | * ptmx_open - open a unix 98 pty master | |
706 | * @inode: inode of device file | |
707 | * @filp: file pointer to tty | |
708 | * | |
709 | * Allocate a unix98 pty master device from the ptmx driver. | |
710 | * | |
711 | * Locking: tty_mutex protects the init_dev work. tty->count should | |
b9f8033f | 712 | * protect the rest. |
d81ed103 AC |
713 | * allocated_ptys_lock handles the list of free pty numbers |
714 | */ | |
715 | ||
64ba3dc3 | 716 | static int ptmx_open(struct inode *inode, struct file *filp) |
d81ed103 AC |
717 | { |
718 | struct tty_struct *tty; | |
162b97cf | 719 | struct inode *slave_inode; |
d81ed103 AC |
720 | int retval; |
721 | int index; | |
722 | ||
723 | nonseekable_open(inode, filp); | |
724 | ||
b0b88565 LT |
725 | /* We refuse fsnotify events on ptmx, since it's a shared resource */ |
726 | filp->f_mode |= FMODE_NONOTIFY; | |
727 | ||
fa90e1c9 JS |
728 | retval = tty_alloc_file(filp); |
729 | if (retval) | |
730 | return retval; | |
731 | ||
d81ed103 | 732 | /* find a device that is not in use. */ |
89c8d91e | 733 | mutex_lock(&devpts_mutex); |
15f1a633 | 734 | index = devpts_new_index(inode); |
fa90e1c9 JS |
735 | if (index < 0) { |
736 | retval = index; | |
05fb79e4 | 737 | mutex_unlock(&devpts_mutex); |
fa90e1c9 JS |
738 | goto err_file; |
739 | } | |
d81ed103 | 740 | |
89c8d91e AC |
741 | mutex_unlock(&devpts_mutex); |
742 | ||
d81ed103 | 743 | mutex_lock(&tty_mutex); |
593a27c4 | 744 | tty = tty_init_dev(ptm_driver, index); |
d81ed103 | 745 | |
73ec06fc AC |
746 | if (IS_ERR(tty)) { |
747 | retval = PTR_ERR(tty); | |
d81ed103 | 748 | goto out; |
73ec06fc | 749 | } |
d81ed103 | 750 | |
89c8d91e AC |
751 | /* The tty returned here is locked so we can safely |
752 | drop the mutex */ | |
753 | mutex_unlock(&tty_mutex); | |
754 | ||
d81ed103 | 755 | set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ |
7acf6cd8 | 756 | tty->driver_data = inode; |
ee2ffa0d | 757 | |
fa90e1c9 | 758 | tty_add_file(tty, filp); |
d81ed103 | 759 | |
f11afb61 JS |
760 | slave_inode = devpts_pty_new(inode, |
761 | MKDEV(UNIX98_PTY_SLAVE_MAJOR, index), index, | |
762 | tty->link); | |
162b97cf JS |
763 | if (IS_ERR(slave_inode)) { |
764 | retval = PTR_ERR(slave_inode); | |
1177c0ef | 765 | goto err_release; |
162b97cf | 766 | } |
7acf6cd8 | 767 | tty->link->driver_data = slave_inode; |
d81ed103 AC |
768 | |
769 | retval = ptm_driver->ops->open(tty, filp); | |
64ba3dc3 | 770 | if (retval) |
1177c0ef JS |
771 | goto err_release; |
772 | ||
89c8d91e | 773 | tty_unlock(tty); |
1177c0ef JS |
774 | return 0; |
775 | err_release: | |
89c8d91e | 776 | tty_unlock(tty); |
eeb89d91 | 777 | tty_release(inode, filp); |
d81ed103 AC |
778 | return retval; |
779 | out: | |
89c8d91e | 780 | mutex_unlock(&tty_mutex); |
d3bda529 | 781 | devpts_kill_index(inode, index); |
fa90e1c9 JS |
782 | err_file: |
783 | tty_free_file(filp); | |
64ba3dc3 | 784 | return retval; |
d81ed103 AC |
785 | } |
786 | ||
787 | static struct file_operations ptmx_fops; | |
788 | ||
1da177e4 LT |
789 | static void __init unix98_pty_init(void) |
790 | { | |
21aca2fa JS |
791 | ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
792 | TTY_DRIVER_RESET_TERMIOS | | |
793 | TTY_DRIVER_REAL_RAW | | |
794 | TTY_DRIVER_DYNAMIC_DEV | | |
795 | TTY_DRIVER_DEVPTS_MEM | | |
796 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 797 | if (IS_ERR(ptm_driver)) |
1da177e4 | 798 | panic("Couldn't allocate Unix98 ptm driver"); |
21aca2fa JS |
799 | pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
800 | TTY_DRIVER_RESET_TERMIOS | | |
801 | TTY_DRIVER_REAL_RAW | | |
802 | TTY_DRIVER_DYNAMIC_DEV | | |
803 | TTY_DRIVER_DEVPTS_MEM | | |
804 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 805 | if (IS_ERR(pts_driver)) |
1da177e4 LT |
806 | panic("Couldn't allocate Unix98 pts driver"); |
807 | ||
1da177e4 LT |
808 | ptm_driver->driver_name = "pty_master"; |
809 | ptm_driver->name = "ptm"; | |
810 | ptm_driver->major = UNIX98_PTY_MASTER_MAJOR; | |
811 | ptm_driver->minor_start = 0; | |
812 | ptm_driver->type = TTY_DRIVER_TYPE_PTY; | |
813 | ptm_driver->subtype = PTY_TYPE_MASTER; | |
814 | ptm_driver->init_termios = tty_std_termios; | |
815 | ptm_driver->init_termios.c_iflag = 0; | |
816 | ptm_driver->init_termios.c_oflag = 0; | |
817 | ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
818 | ptm_driver->init_termios.c_lflag = 0; | |
606d099c AC |
819 | ptm_driver->init_termios.c_ispeed = 38400; |
820 | ptm_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 821 | ptm_driver->other = pts_driver; |
feebed65 | 822 | tty_set_operations(ptm_driver, &ptm_unix98_ops); |
1da177e4 | 823 | |
1da177e4 LT |
824 | pts_driver->driver_name = "pty_slave"; |
825 | pts_driver->name = "pts"; | |
826 | pts_driver->major = UNIX98_PTY_SLAVE_MAJOR; | |
827 | pts_driver->minor_start = 0; | |
828 | pts_driver->type = TTY_DRIVER_TYPE_PTY; | |
829 | pts_driver->subtype = PTY_TYPE_SLAVE; | |
830 | pts_driver->init_termios = tty_std_termios; | |
831 | pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
832 | pts_driver->init_termios.c_ispeed = 38400; |
833 | pts_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 834 | pts_driver->other = ptm_driver; |
99f1fe18 | 835 | tty_set_operations(pts_driver, &pty_unix98_ops); |
fe9cd962 | 836 | |
1da177e4 LT |
837 | if (tty_register_driver(ptm_driver)) |
838 | panic("Couldn't register Unix98 ptm driver"); | |
839 | if (tty_register_driver(pts_driver)) | |
840 | panic("Couldn't register Unix98 pts driver"); | |
841 | ||
d81ed103 AC |
842 | /* Now create the /dev/ptmx special device */ |
843 | tty_default_fops(&ptmx_fops); | |
844 | ptmx_fops.open = ptmx_open; | |
845 | ||
846 | cdev_init(&ptmx_cdev, &ptmx_fops); | |
847 | if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) || | |
848 | register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0) | |
82f8c35f | 849 | panic("Couldn't register /dev/ptmx driver"); |
d81ed103 | 850 | device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); |
1da177e4 | 851 | } |
d81ed103 | 852 | |
1da177e4 LT |
853 | #else |
854 | static inline void unix98_pty_init(void) { } | |
855 | #endif | |
856 | ||
857 | static int __init pty_init(void) | |
858 | { | |
859 | legacy_pty_init(); | |
860 | unix98_pty_init(); | |
861 | return 0; | |
862 | } | |
863 | module_init(pty_init); |