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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * Copyright (C) 1991, 1992 Linus Torvalds |
4 | * | |
5 | * Added support for a Unix98-style ptmx device. | |
6 | * -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998 | |
1da177e4 | 7 | * |
1da177e4 LT |
8 | */ |
9 | ||
fe9cd962 | 10 | #include <linux/module.h> |
1da177e4 | 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> | |
3f07c014 | 16 | #include <linux/sched/signal.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> |
54ebbfb1 AS |
28 | #include <linux/mount.h> |
29 | #include <linux/file.h> | |
30 | #include <linux/ioctl.h> | |
1da177e4 | 31 | |
d6847793 PH |
32 | #undef TTY_DEBUG_HANGUP |
33 | #ifdef TTY_DEBUG_HANGUP | |
34 | # define tty_debug_hangup(tty, f, args...) tty_debug(tty, f, ##args) | |
35 | #else | |
36 | # define tty_debug_hangup(tty, f, args...) do {} while (0) | |
37 | #endif | |
fe9cd962 | 38 | |
1da177e4 | 39 | #ifdef CONFIG_UNIX98_PTYS |
da2bdf9a | 40 | static struct tty_driver *ptm_driver; |
1da177e4 | 41 | static struct tty_driver *pts_driver; |
d739e65b | 42 | static DEFINE_MUTEX(devpts_mutex); |
1da177e4 LT |
43 | #endif |
44 | ||
fe9cd962 | 45 | static void pty_close(struct tty_struct *tty, struct file *filp) |
1da177e4 | 46 | { |
fe9cd962 AC |
47 | BUG_ON(!tty); |
48 | if (tty->driver->subtype == PTY_TYPE_MASTER) | |
49 | WARN_ON(tty->count > 1); | |
50 | else { | |
18900ca6 | 51 | if (tty_io_error(tty)) |
69939035 | 52 | return; |
1da177e4 LT |
53 | if (tty->count > 2) |
54 | return; | |
55 | } | |
69939035 | 56 | set_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
57 | wake_up_interruptible(&tty->read_wait); |
58 | wake_up_interruptible(&tty->write_wait); | |
4ed60fc2 | 59 | spin_lock_irq(&tty->ctrl_lock); |
1da177e4 | 60 | tty->packet = 0; |
4ed60fc2 | 61 | spin_unlock_irq(&tty->ctrl_lock); |
89c8d91e | 62 | /* Review - krefs on tty_link ?? */ |
1da177e4 LT |
63 | if (!tty->link) |
64 | return; | |
1da177e4 | 65 | set_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
0f40fbbc | 66 | wake_up_interruptible(&tty->link->read_wait); |
1da177e4 LT |
67 | wake_up_interruptible(&tty->link->write_wait); |
68 | if (tty->driver->subtype == PTY_TYPE_MASTER) { | |
69 | set_bit(TTY_OTHER_CLOSED, &tty->flags); | |
ce1000dd | 70 | #ifdef CONFIG_UNIX98_PTYS |
d739e65b | 71 | if (tty->driver == ptm_driver) { |
b9f8033f | 72 | mutex_lock(&devpts_mutex); |
311fc65c EB |
73 | if (tty->link->driver_data) |
74 | devpts_pty_kill(tty->link->driver_data); | |
b9f8033f | 75 | mutex_unlock(&devpts_mutex); |
d739e65b | 76 | } |
ce1000dd | 77 | #endif |
11dbf203 | 78 | tty_vhangup(tty->link); |
1da177e4 LT |
79 | } |
80 | } | |
81 | ||
82 | /* | |
83 | * The unthrottle routine is called by the line discipline to signal | |
84 | * that it can receive more characters. For PTY's, the TTY_THROTTLED | |
85 | * flag is always set, to force the line discipline to always call the | |
fe9cd962 | 86 | * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE |
1da177e4 LT |
87 | * characters in the queue. This is necessary since each time this |
88 | * happens, we need to wake up any sleeping processes that could be | |
89 | * (1) trying to send data to the pty, or (2) waiting in wait_until_sent() | |
90 | * for the pty buffer to be drained. | |
91 | */ | |
fe9cd962 | 92 | static void pty_unthrottle(struct tty_struct *tty) |
1da177e4 | 93 | { |
d945cb9c | 94 | tty_wakeup(tty->link); |
1da177e4 LT |
95 | set_bit(TTY_THROTTLED, &tty->flags); |
96 | } | |
97 | ||
d945cb9c AC |
98 | /** |
99 | * pty_write - write to a pty | |
100 | * @tty: the tty we write from | |
101 | * @buf: kernel buffer of data | |
102 | * @count: bytes to write | |
762faaed | 103 | * |
d945cb9c AC |
104 | * Our "hardware" write method. Data is coming from the ldisc which |
105 | * may be in a non sleeping state. We simply throw this at the other | |
106 | * end of the link as if we were an IRQ handler receiving stuff for | |
107 | * the other side of the pty/tty pair. | |
1da177e4 | 108 | */ |
d945cb9c | 109 | |
ac89a917 | 110 | static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c) |
1da177e4 LT |
111 | { |
112 | struct tty_struct *to = tty->link; | |
f89e73d6 | 113 | unsigned long flags; |
1da177e4 | 114 | |
d945cb9c | 115 | if (tty->stopped) |
1da177e4 | 116 | return 0; |
d945cb9c | 117 | |
d945cb9c | 118 | if (c > 0) { |
f89e73d6 | 119 | spin_lock_irqsave(&to->port->lock, flags); |
d945cb9c | 120 | /* Stuff the data into the input queue of the other end */ |
05c7cd39 | 121 | c = tty_insert_flip_string(to->port, buf, c); |
d945cb9c | 122 | /* And shovel */ |
5ede5253 | 123 | if (c) |
2e124b4a | 124 | tty_flip_buffer_push(to->port); |
f89e73d6 | 125 | spin_unlock_irqrestore(&to->port->lock, flags); |
762faaed | 126 | } |
1da177e4 LT |
127 | return c; |
128 | } | |
129 | ||
d945cb9c AC |
130 | /** |
131 | * pty_write_room - write space | |
132 | * @tty: tty we are writing from | |
133 | * | |
134 | * Report how many bytes the ldisc can send into the queue for | |
135 | * the other device. | |
136 | */ | |
137 | ||
1da177e4 LT |
138 | static int pty_write_room(struct tty_struct *tty) |
139 | { | |
85dfd81d LT |
140 | if (tty->stopped) |
141 | return 0; | |
c81622ac | 142 | return tty_buffer_space_avail(tty->link->port); |
1da177e4 LT |
143 | } |
144 | ||
d945cb9c AC |
145 | /** |
146 | * pty_chars_in_buffer - characters currently in our tx queue | |
147 | * @tty: our tty | |
fe9cd962 | 148 | * |
d945cb9c AC |
149 | * Report how much we have in the transmit queue. As everything is |
150 | * instantly at the other end this is easy to implement. | |
1da177e4 | 151 | */ |
d945cb9c | 152 | |
1da177e4 LT |
153 | static int pty_chars_in_buffer(struct tty_struct *tty) |
154 | { | |
d945cb9c | 155 | return 0; |
1da177e4 LT |
156 | } |
157 | ||
158 | /* Set the lock flag on a pty */ | |
fe9cd962 | 159 | static int pty_set_lock(struct tty_struct *tty, int __user *arg) |
1da177e4 LT |
160 | { |
161 | int val; | |
fe9cd962 | 162 | if (get_user(val, arg)) |
1da177e4 LT |
163 | return -EFAULT; |
164 | if (val) | |
165 | set_bit(TTY_PTY_LOCK, &tty->flags); | |
166 | else | |
167 | clear_bit(TTY_PTY_LOCK, &tty->flags); | |
168 | return 0; | |
169 | } | |
170 | ||
84fd7bdf CG |
171 | static int pty_get_lock(struct tty_struct *tty, int __user *arg) |
172 | { | |
173 | int locked = test_bit(TTY_PTY_LOCK, &tty->flags); | |
174 | return put_user(locked, arg); | |
175 | } | |
176 | ||
06026d91 CG |
177 | /* Set the packet mode on a pty */ |
178 | static int pty_set_pktmode(struct tty_struct *tty, int __user *arg) | |
179 | { | |
06026d91 CG |
180 | int pktmode; |
181 | ||
182 | if (get_user(pktmode, arg)) | |
183 | return -EFAULT; | |
184 | ||
6054c16e | 185 | spin_lock_irq(&tty->ctrl_lock); |
06026d91 CG |
186 | if (pktmode) { |
187 | if (!tty->packet) { | |
06026d91 | 188 | tty->link->ctrl_status = 0; |
2622d73e PH |
189 | smp_mb(); |
190 | tty->packet = 1; | |
06026d91 CG |
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 | ||
37480a05 PH |
211 | if (sig != SIGINT && sig != SIGQUIT && sig != SIGTSTP) |
212 | return -EINVAL; | |
213 | ||
26df6d13 | 214 | if (tty->link) { |
5b239542 PH |
215 | pgrp = tty_get_pgrp(tty->link); |
216 | if (pgrp) | |
217 | kill_pgrp(pgrp, sig, 1); | |
26df6d13 | 218 | put_pid(pgrp); |
219 | } | |
220 | return 0; | |
221 | } | |
222 | ||
1da177e4 LT |
223 | static void pty_flush_buffer(struct tty_struct *tty) |
224 | { | |
225 | struct tty_struct *to = tty->link; | |
fe9cd962 | 226 | |
1da177e4 LT |
227 | if (!to) |
228 | return; | |
1d1d14da | 229 | |
77dae613 | 230 | tty_buffer_flush(to, NULL); |
1da177e4 | 231 | if (to->packet) { |
6054c16e | 232 | spin_lock_irq(&tty->ctrl_lock); |
1da177e4 LT |
233 | tty->ctrl_status |= TIOCPKT_FLUSHWRITE; |
234 | wake_up_interruptible(&to->read_wait); | |
6054c16e | 235 | spin_unlock_irq(&tty->ctrl_lock); |
1da177e4 LT |
236 | } |
237 | } | |
238 | ||
fe9cd962 | 239 | static int pty_open(struct tty_struct *tty, struct file *filp) |
1da177e4 | 240 | { |
1da177e4 | 241 | if (!tty || !tty->link) |
7c61c3d8 | 242 | return -ENODEV; |
69939035 | 243 | |
1da177e4 LT |
244 | if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) |
245 | goto out; | |
246 | if (test_bit(TTY_PTY_LOCK, &tty->link->flags)) | |
247 | goto out; | |
80cace72 | 248 | if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1) |
1da177e4 LT |
249 | goto out; |
250 | ||
69939035 | 251 | clear_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
252 | clear_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
253 | set_bit(TTY_THROTTLED, &tty->flags); | |
7c61c3d8 PH |
254 | return 0; |
255 | ||
1da177e4 | 256 | out: |
7c61c3d8 PH |
257 | set_bit(TTY_IO_ERROR, &tty->flags); |
258 | return -EIO; | |
1da177e4 LT |
259 | } |
260 | ||
fe9cd962 AC |
261 | static void pty_set_termios(struct tty_struct *tty, |
262 | struct ktermios *old_termios) | |
1da177e4 | 263 | { |
dbfcd851 PH |
264 | /* See if packet mode change of state. */ |
265 | if (tty->link && tty->link->packet) { | |
9db276f8 | 266 | int extproc = (old_termios->c_lflag & EXTPROC) | L_EXTPROC(tty); |
dbfcd851 PH |
267 | int old_flow = ((old_termios->c_iflag & IXON) && |
268 | (old_termios->c_cc[VSTOP] == '\023') && | |
269 | (old_termios->c_cc[VSTART] == '\021')); | |
270 | int new_flow = (I_IXON(tty) && | |
271 | STOP_CHAR(tty) == '\023' && | |
272 | START_CHAR(tty) == '\021'); | |
273 | if ((old_flow != new_flow) || extproc) { | |
4d8c1dff | 274 | spin_lock_irq(&tty->ctrl_lock); |
dbfcd851 PH |
275 | if (old_flow != new_flow) { |
276 | tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); | |
277 | if (new_flow) | |
278 | tty->ctrl_status |= TIOCPKT_DOSTOP; | |
279 | else | |
280 | tty->ctrl_status |= TIOCPKT_NOSTOP; | |
281 | } | |
282 | if (extproc) | |
283 | tty->ctrl_status |= TIOCPKT_IOCTL; | |
4d8c1dff | 284 | spin_unlock_irq(&tty->ctrl_lock); |
dbfcd851 PH |
285 | wake_up_interruptible(&tty->link->read_wait); |
286 | } | |
287 | } | |
288 | ||
adc8d746 AC |
289 | tty->termios.c_cflag &= ~(CSIZE | PARENB); |
290 | tty->termios.c_cflag |= (CS8 | CREAD); | |
1da177e4 LT |
291 | } |
292 | ||
fc6f6238 AC |
293 | /** |
294 | * pty_do_resize - resize event | |
295 | * @tty: tty being resized | |
c774bda2 | 296 | * @ws: window size being set. |
fc6f6238 | 297 | * |
3ad2f3fb | 298 | * Update the termios variables and send the necessary signals to |
fc6f6238 AC |
299 | * peform a terminal resize correctly |
300 | */ | |
301 | ||
159a8e92 | 302 | static int pty_resize(struct tty_struct *tty, struct winsize *ws) |
fc6f6238 AC |
303 | { |
304 | struct pid *pgrp, *rpgrp; | |
fc6f6238 AC |
305 | struct tty_struct *pty = tty->link; |
306 | ||
307 | /* For a PTY we need to lock the tty side */ | |
dee4a0be | 308 | mutex_lock(&tty->winsize_mutex); |
fc6f6238 AC |
309 | if (!memcmp(ws, &tty->winsize, sizeof(*ws))) |
310 | goto done; | |
311 | ||
5b239542 PH |
312 | /* Signal the foreground process group of both ptys */ |
313 | pgrp = tty_get_pgrp(tty); | |
314 | rpgrp = tty_get_pgrp(pty); | |
fc6f6238 AC |
315 | |
316 | if (pgrp) | |
317 | kill_pgrp(pgrp, SIGWINCH, 1); | |
318 | if (rpgrp != pgrp && rpgrp) | |
319 | kill_pgrp(rpgrp, SIGWINCH, 1); | |
320 | ||
321 | put_pid(pgrp); | |
322 | put_pid(rpgrp); | |
323 | ||
324 | tty->winsize = *ws; | |
325 | pty->winsize = *ws; /* Never used so will go away soon */ | |
326 | done: | |
dee4a0be | 327 | mutex_unlock(&tty->winsize_mutex); |
fc6f6238 AC |
328 | return 0; |
329 | } | |
330 | ||
01adc807 PH |
331 | /** |
332 | * pty_start - start() handler | |
333 | * pty_stop - stop() handler | |
334 | * @tty: tty being flow-controlled | |
335 | * | |
336 | * Propagates the TIOCPKT status to the master pty. | |
337 | * | |
338 | * NB: only the master pty can be in packet mode so only the slave | |
339 | * needs start()/stop() handlers | |
340 | */ | |
341 | static void pty_start(struct tty_struct *tty) | |
342 | { | |
343 | unsigned long flags; | |
344 | ||
01adc807 | 345 | if (tty->link && tty->link->packet) { |
54e8e5fc | 346 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
01adc807 PH |
347 | tty->ctrl_status &= ~TIOCPKT_STOP; |
348 | tty->ctrl_status |= TIOCPKT_START; | |
54e8e5fc | 349 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
01adc807 PH |
350 | wake_up_interruptible_poll(&tty->link->read_wait, POLLIN); |
351 | } | |
01adc807 PH |
352 | } |
353 | ||
354 | static void pty_stop(struct tty_struct *tty) | |
355 | { | |
356 | unsigned long flags; | |
357 | ||
01adc807 | 358 | if (tty->link && tty->link->packet) { |
54e8e5fc | 359 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
01adc807 PH |
360 | tty->ctrl_status &= ~TIOCPKT_START; |
361 | tty->ctrl_status |= TIOCPKT_STOP; | |
54e8e5fc | 362 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
01adc807 PH |
363 | wake_up_interruptible_poll(&tty->link->read_wait, POLLIN); |
364 | } | |
01adc807 PH |
365 | } |
366 | ||
d155255a AC |
367 | /** |
368 | * pty_common_install - set up the pty pair | |
369 | * @driver: the pty driver | |
370 | * @tty: the tty being instantiated | |
2c964a2f | 371 | * @legacy: true if this is BSD style |
d155255a AC |
372 | * |
373 | * Perform the initial set up for the tty/pty pair. Called from the | |
374 | * tty layer when the port is first opened. | |
375 | * | |
376 | * Locking: the caller must hold the tty_mutex | |
377 | */ | |
5d249bc6 JS |
378 | static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty, |
379 | bool legacy) | |
bf970ee4 AC |
380 | { |
381 | struct tty_struct *o_tty; | |
d03702a2 | 382 | struct tty_port *ports[2]; |
bf970ee4 | 383 | int idx = tty->index; |
5d249bc6 | 384 | int retval = -ENOMEM; |
bf970ee4 | 385 | |
55199ea3 PH |
386 | /* Opening the slave first has always returned -EIO */ |
387 | if (driver->subtype != PTY_TYPE_MASTER) | |
388 | return -EIO; | |
389 | ||
d03702a2 JS |
390 | ports[0] = kmalloc(sizeof **ports, GFP_KERNEL); |
391 | ports[1] = kmalloc(sizeof **ports, GFP_KERNEL); | |
6f9ea7ad | 392 | if (!ports[0] || !ports[1]) |
2c964a2f | 393 | goto err; |
bf970ee4 AC |
394 | if (!try_module_get(driver->other->owner)) { |
395 | /* This cannot in fact currently happen */ | |
2c964a2f | 396 | goto err; |
bf970ee4 | 397 | } |
2c964a2f RV |
398 | o_tty = alloc_tty_struct(driver->other, idx); |
399 | if (!o_tty) | |
400 | goto err_put_module; | |
bf970ee4 | 401 | |
2febdb63 | 402 | tty_set_lock_subclass(o_tty); |
d2b6f447 | 403 | lockdep_set_subclass(&o_tty->termios_rwsem, TTY_LOCK_SLAVE); |
2febdb63 | 404 | |
5d249bc6 JS |
405 | if (legacy) { |
406 | /* We always use new tty termios data so we can do this | |
407 | the easy way .. */ | |
a3123fd0 PH |
408 | tty_init_termios(tty); |
409 | tty_init_termios(o_tty); | |
5d249bc6 JS |
410 | |
411 | driver->other->ttys[idx] = o_tty; | |
412 | driver->ttys[idx] = tty; | |
413 | } else { | |
adc8d746 AC |
414 | memset(&tty->termios_locked, 0, sizeof(tty->termios_locked)); |
415 | tty->termios = driver->init_termios; | |
416 | memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked)); | |
417 | o_tty->termios = driver->other->init_termios; | |
5d249bc6 | 418 | } |
fe9cd962 | 419 | |
bf970ee4 AC |
420 | /* |
421 | * Everything allocated ... set up the o_tty structure. | |
422 | */ | |
bf970ee4 | 423 | tty_driver_kref_get(driver->other); |
bf970ee4 AC |
424 | /* Establish the links in both directions */ |
425 | tty->link = o_tty; | |
426 | o_tty->link = tty; | |
d03702a2 JS |
427 | tty_port_init(ports[0]); |
428 | tty_port_init(ports[1]); | |
c81622ac PH |
429 | tty_buffer_set_limit(ports[0], 8192); |
430 | tty_buffer_set_limit(ports[1], 8192); | |
d03702a2 JS |
431 | o_tty->port = ports[0]; |
432 | tty->port = ports[1]; | |
967fab69 | 433 | o_tty->port->itty = o_tty; |
bf970ee4 | 434 | |
1d1d14da PH |
435 | tty_buffer_set_lock_subclass(o_tty->port); |
436 | ||
bf970ee4 AC |
437 | tty_driver_kref_get(driver); |
438 | tty->count++; | |
55199ea3 | 439 | o_tty->count++; |
bf970ee4 | 440 | return 0; |
a3123fd0 | 441 | |
2c964a2f | 442 | err_put_module: |
07584d4a | 443 | module_put(driver->other->owner); |
2c964a2f | 444 | err: |
d03702a2 JS |
445 | kfree(ports[0]); |
446 | kfree(ports[1]); | |
8a1b8d70 | 447 | return retval; |
bf970ee4 AC |
448 | } |
449 | ||
d03702a2 JS |
450 | static void pty_cleanup(struct tty_struct *tty) |
451 | { | |
81c79838 | 452 | tty_port_put(tty->port); |
d03702a2 JS |
453 | } |
454 | ||
5d249bc6 JS |
455 | /* Traditional BSD devices */ |
456 | #ifdef CONFIG_LEGACY_PTYS | |
457 | ||
458 | static int pty_install(struct tty_driver *driver, struct tty_struct *tty) | |
459 | { | |
460 | return pty_common_install(driver, tty, true); | |
461 | } | |
462 | ||
d155255a AC |
463 | static void pty_remove(struct tty_driver *driver, struct tty_struct *tty) |
464 | { | |
465 | struct tty_struct *pair = tty->link; | |
466 | driver->ttys[tty->index] = NULL; | |
467 | if (pair) | |
468 | pair->driver->ttys[pair->index] = NULL; | |
469 | } | |
470 | ||
6caa76b7 | 471 | static int pty_bsd_ioctl(struct tty_struct *tty, |
1da177e4 LT |
472 | unsigned int cmd, unsigned long arg) |
473 | { | |
474 | switch (cmd) { | |
475 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
476 | return pty_set_lock(tty, (int __user *) arg); | |
84fd7bdf CG |
477 | case TIOCGPTLCK: /* Get PT Lock status */ |
478 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
479 | case TIOCPKT: /* Set PT packet mode */ |
480 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
481 | case TIOCGPKT: /* Get PT packet mode */ |
482 | return pty_get_pktmode(tty, (int __user *)arg); | |
26df6d13 | 483 | case TIOCSIG: /* Send signal to other side of pty */ |
484 | return pty_signal(tty, (int) arg); | |
ded2f295 JS |
485 | case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */ |
486 | return -EINVAL; | |
1da177e4 LT |
487 | } |
488 | return -ENOIOCTLCMD; | |
489 | } | |
490 | ||
5f0f187f AS |
491 | static long pty_bsd_compat_ioctl(struct tty_struct *tty, |
492 | unsigned int cmd, unsigned long arg) | |
493 | { | |
494 | /* | |
495 | * PTY ioctls don't require any special translation between 32-bit and | |
496 | * 64-bit userspace, they are already compatible. | |
497 | */ | |
498 | return pty_bsd_ioctl(tty, cmd, arg); | |
499 | } | |
500 | ||
dc8c8587 | 501 | static int legacy_count = CONFIG_LEGACY_PTY_COUNT; |
7154988f PG |
502 | /* |
503 | * not really modular, but the easiest way to keep compat with existing | |
504 | * bootargs behaviour is to continue using module_param here. | |
505 | */ | |
dc8c8587 KS |
506 | module_param(legacy_count, int, 0); |
507 | ||
342a5971 LT |
508 | /* |
509 | * The master side of a pty can do TIOCSPTLCK and thus | |
510 | * has pty_bsd_ioctl. | |
511 | */ | |
512 | static const struct tty_operations master_pty_ops_bsd = { | |
513 | .install = pty_install, | |
3e8e88ca AC |
514 | .open = pty_open, |
515 | .close = pty_close, | |
516 | .write = pty_write, | |
517 | .write_room = pty_write_room, | |
518 | .flush_buffer = pty_flush_buffer, | |
519 | .chars_in_buffer = pty_chars_in_buffer, | |
520 | .unthrottle = pty_unthrottle, | |
3e8e88ca | 521 | .ioctl = pty_bsd_ioctl, |
5f0f187f | 522 | .compat_ioctl = pty_bsd_compat_ioctl, |
d03702a2 | 523 | .cleanup = pty_cleanup, |
d155255a AC |
524 | .resize = pty_resize, |
525 | .remove = pty_remove | |
3e8e88ca AC |
526 | }; |
527 | ||
342a5971 LT |
528 | static const struct tty_operations slave_pty_ops_bsd = { |
529 | .install = pty_install, | |
530 | .open = pty_open, | |
531 | .close = pty_close, | |
532 | .write = pty_write, | |
533 | .write_room = pty_write_room, | |
534 | .flush_buffer = pty_flush_buffer, | |
535 | .chars_in_buffer = pty_chars_in_buffer, | |
536 | .unthrottle = pty_unthrottle, | |
537 | .set_termios = pty_set_termios, | |
d03702a2 | 538 | .cleanup = pty_cleanup, |
d155255a | 539 | .resize = pty_resize, |
01adc807 PH |
540 | .start = pty_start, |
541 | .stop = pty_stop, | |
d155255a | 542 | .remove = pty_remove |
342a5971 LT |
543 | }; |
544 | ||
1da177e4 LT |
545 | static void __init legacy_pty_init(void) |
546 | { | |
342a5971 LT |
547 | struct tty_driver *pty_driver, *pty_slave_driver; |
548 | ||
dc8c8587 KS |
549 | if (legacy_count <= 0) |
550 | return; | |
1da177e4 | 551 | |
21aca2fa JS |
552 | pty_driver = tty_alloc_driver(legacy_count, |
553 | TTY_DRIVER_RESET_TERMIOS | | |
554 | TTY_DRIVER_REAL_RAW | | |
555 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 556 | if (IS_ERR(pty_driver)) |
1da177e4 LT |
557 | panic("Couldn't allocate pty driver"); |
558 | ||
21aca2fa JS |
559 | pty_slave_driver = tty_alloc_driver(legacy_count, |
560 | TTY_DRIVER_RESET_TERMIOS | | |
561 | TTY_DRIVER_REAL_RAW | | |
562 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 563 | if (IS_ERR(pty_slave_driver)) |
1da177e4 LT |
564 | panic("Couldn't allocate pty slave driver"); |
565 | ||
1da177e4 LT |
566 | pty_driver->driver_name = "pty_master"; |
567 | pty_driver->name = "pty"; | |
1da177e4 LT |
568 | pty_driver->major = PTY_MASTER_MAJOR; |
569 | pty_driver->minor_start = 0; | |
570 | pty_driver->type = TTY_DRIVER_TYPE_PTY; | |
571 | pty_driver->subtype = PTY_TYPE_MASTER; | |
572 | pty_driver->init_termios = tty_std_termios; | |
573 | pty_driver->init_termios.c_iflag = 0; | |
574 | pty_driver->init_termios.c_oflag = 0; | |
575 | pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
576 | pty_driver->init_termios.c_lflag = 0; | |
606d099c AC |
577 | pty_driver->init_termios.c_ispeed = 38400; |
578 | pty_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 579 | pty_driver->other = pty_slave_driver; |
342a5971 | 580 | tty_set_operations(pty_driver, &master_pty_ops_bsd); |
1da177e4 | 581 | |
1da177e4 LT |
582 | pty_slave_driver->driver_name = "pty_slave"; |
583 | pty_slave_driver->name = "ttyp"; | |
1da177e4 LT |
584 | pty_slave_driver->major = PTY_SLAVE_MAJOR; |
585 | pty_slave_driver->minor_start = 0; | |
586 | pty_slave_driver->type = TTY_DRIVER_TYPE_PTY; | |
587 | pty_slave_driver->subtype = PTY_TYPE_SLAVE; | |
588 | pty_slave_driver->init_termios = tty_std_termios; | |
589 | pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
590 | pty_slave_driver->init_termios.c_ispeed = 38400; |
591 | pty_slave_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 592 | pty_slave_driver->other = pty_driver; |
342a5971 | 593 | tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd); |
1da177e4 LT |
594 | |
595 | if (tty_register_driver(pty_driver)) | |
596 | panic("Couldn't register pty driver"); | |
597 | if (tty_register_driver(pty_slave_driver)) | |
598 | panic("Couldn't register pty slave driver"); | |
599 | } | |
600 | #else | |
601 | static inline void legacy_pty_init(void) { } | |
602 | #endif | |
603 | ||
604 | /* Unix98 devices */ | |
605 | #ifdef CONFIG_UNIX98_PTYS | |
d81ed103 AC |
606 | static struct cdev ptmx_cdev; |
607 | ||
6509f309 | 608 | /** |
311fc65c EB |
609 | * ptm_open_peer - open the peer of a pty |
610 | * @master: the open struct file of the ptmx device node | |
611 | * @tty: the master of the pty being opened | |
612 | * @flags: the flags for open | |
6509f309 | 613 | * |
311fc65c EB |
614 | * Provide a race free way for userspace to open the slave end of a pty |
615 | * (where they have the master fd and cannot access or trust the mount | |
616 | * namespace /dev/pts was mounted inside). | |
6509f309 | 617 | */ |
311fc65c | 618 | int ptm_open_peer(struct file *master, struct tty_struct *tty, int flags) |
6509f309 AB |
619 | { |
620 | int fd = -1; | |
311fc65c | 621 | struct file *filp; |
6509f309 | 622 | int retval = -EINVAL; |
311fc65c EB |
623 | struct path path; |
624 | ||
625 | if (tty->driver != ptm_driver) | |
626 | return -EIO; | |
6509f309 | 627 | |
51f68b96 | 628 | fd = get_unused_fd_flags(flags); |
6509f309 AB |
629 | if (fd < 0) { |
630 | retval = fd; | |
631 | goto err; | |
632 | } | |
633 | ||
311fc65c EB |
634 | /* Compute the slave's path */ |
635 | path.mnt = devpts_mntget(master, tty->driver_data); | |
636 | if (IS_ERR(path.mnt)) { | |
637 | retval = PTR_ERR(path.mnt); | |
638 | goto err_put; | |
639 | } | |
640 | path.dentry = tty->link->driver_data; | |
641 | ||
642 | filp = dentry_open(&path, flags, current_cred()); | |
643 | mntput(path.mnt); | |
6509f309 AB |
644 | if (IS_ERR(filp)) { |
645 | retval = PTR_ERR(filp); | |
646 | goto err_put; | |
647 | } | |
648 | ||
649 | fd_install(fd, filp); | |
650 | return fd; | |
651 | ||
652 | err_put: | |
653 | put_unused_fd(fd); | |
654 | err: | |
655 | return retval; | |
656 | } | |
657 | ||
6caa76b7 | 658 | static int pty_unix98_ioctl(struct tty_struct *tty, |
1da177e4 LT |
659 | unsigned int cmd, unsigned long arg) |
660 | { | |
661 | switch (cmd) { | |
662 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
663 | return pty_set_lock(tty, (int __user *)arg); | |
84fd7bdf CG |
664 | case TIOCGPTLCK: /* Get PT Lock status */ |
665 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
666 | case TIOCPKT: /* Set PT packet mode */ |
667 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
668 | case TIOCGPKT: /* Get PT packet mode */ |
669 | return pty_get_pktmode(tty, (int __user *)arg); | |
1da177e4 LT |
670 | case TIOCGPTN: /* Get PT Number */ |
671 | return put_user(tty->index, (unsigned int __user *)arg); | |
26df6d13 | 672 | case TIOCSIG: /* Send signal to other side of pty */ |
673 | return pty_signal(tty, (int) arg); | |
1da177e4 LT |
674 | } |
675 | ||
676 | return -ENOIOCTLCMD; | |
677 | } | |
678 | ||
5f0f187f AS |
679 | static long pty_unix98_compat_ioctl(struct tty_struct *tty, |
680 | unsigned int cmd, unsigned long arg) | |
681 | { | |
682 | /* | |
683 | * PTY ioctls don't require any special translation between 32-bit and | |
684 | * 64-bit userspace, they are already compatible. | |
685 | */ | |
686 | return pty_unix98_ioctl(tty, cmd, arg); | |
687 | } | |
688 | ||
99f1fe18 AC |
689 | /** |
690 | * ptm_unix98_lookup - find a pty master | |
691 | * @driver: ptm driver | |
692 | * @idx: tty index | |
693 | * | |
694 | * Look up a pty master device. Called under the tty_mutex for now. | |
695 | * This provides our locking. | |
696 | */ | |
697 | ||
15f1a633 | 698 | static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, |
8ead9dd5 | 699 | struct file *file, int idx) |
99f1fe18 | 700 | { |
593a27c4 KK |
701 | /* Master must be open via /dev/ptmx */ |
702 | return ERR_PTR(-EIO); | |
99f1fe18 AC |
703 | } |
704 | ||
705 | /** | |
706 | * pts_unix98_lookup - find a pty slave | |
707 | * @driver: pts driver | |
708 | * @idx: tty index | |
709 | * | |
710 | * Look up a pty master device. Called under the tty_mutex for now. | |
d739e65b | 711 | * This provides our locking for the tty pointer. |
99f1fe18 AC |
712 | */ |
713 | ||
15f1a633 | 714 | static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver, |
8ead9dd5 | 715 | struct file *file, int idx) |
99f1fe18 | 716 | { |
d739e65b AC |
717 | struct tty_struct *tty; |
718 | ||
719 | mutex_lock(&devpts_mutex); | |
8ead9dd5 | 720 | tty = devpts_get_priv(file->f_path.dentry); |
d739e65b | 721 | mutex_unlock(&devpts_mutex); |
99f1fe18 AC |
722 | /* Master must be open before slave */ |
723 | if (!tty) | |
724 | return ERR_PTR(-EIO); | |
725 | return tty; | |
726 | } | |
727 | ||
bf970ee4 | 728 | static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty) |
8b0a88d5 | 729 | { |
5d249bc6 | 730 | return pty_common_install(driver, tty, false); |
8b0a88d5 AC |
731 | } |
732 | ||
f4b208eb | 733 | /* this is called once with whichever end is closed last */ |
c1e33af1 | 734 | static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty) |
f4b208eb | 735 | { |
67245ff3 | 736 | struct pts_fs_info *fsi; |
2831c89f HK |
737 | |
738 | if (tty->driver->subtype == PTY_TYPE_MASTER) | |
67245ff3 | 739 | fsi = tty->driver_data; |
2831c89f | 740 | else |
67245ff3 | 741 | fsi = tty->link->driver_data; |
5353ed8d CIK |
742 | |
743 | if (fsi) { | |
744 | devpts_kill_index(fsi, tty->index); | |
745 | devpts_release(fsi); | |
746 | } | |
f4b208eb JS |
747 | } |
748 | ||
d01c3289 MY |
749 | static void pty_show_fdinfo(struct tty_struct *tty, struct seq_file *m) |
750 | { | |
751 | seq_printf(m, "tty-index:\t%d\n", tty->index); | |
752 | } | |
753 | ||
feebed65 | 754 | static const struct tty_operations ptm_unix98_ops = { |
99f1fe18 | 755 | .lookup = ptm_unix98_lookup, |
bf970ee4 | 756 | .install = pty_unix98_install, |
7171604a | 757 | .remove = pty_unix98_remove, |
3e8e88ca AC |
758 | .open = pty_open, |
759 | .close = pty_close, | |
760 | .write = pty_write, | |
761 | .write_room = pty_write_room, | |
762 | .flush_buffer = pty_flush_buffer, | |
763 | .chars_in_buffer = pty_chars_in_buffer, | |
764 | .unthrottle = pty_unthrottle, | |
feebed65 | 765 | .ioctl = pty_unix98_ioctl, |
5f0f187f | 766 | .compat_ioctl = pty_unix98_compat_ioctl, |
36b3c070 | 767 | .resize = pty_resize, |
d01c3289 MY |
768 | .cleanup = pty_cleanup, |
769 | .show_fdinfo = pty_show_fdinfo, | |
3e8e88ca AC |
770 | }; |
771 | ||
99f1fe18 AC |
772 | static const struct tty_operations pty_unix98_ops = { |
773 | .lookup = pts_unix98_lookup, | |
bf970ee4 | 774 | .install = pty_unix98_install, |
7171604a | 775 | .remove = pty_unix98_remove, |
99f1fe18 AC |
776 | .open = pty_open, |
777 | .close = pty_close, | |
778 | .write = pty_write, | |
779 | .write_room = pty_write_room, | |
780 | .flush_buffer = pty_flush_buffer, | |
781 | .chars_in_buffer = pty_chars_in_buffer, | |
782 | .unthrottle = pty_unthrottle, | |
783 | .set_termios = pty_set_termios, | |
01adc807 PH |
784 | .start = pty_start, |
785 | .stop = pty_stop, | |
d03702a2 | 786 | .cleanup = pty_cleanup, |
99f1fe18 | 787 | }; |
d81ed103 AC |
788 | |
789 | /** | |
790 | * ptmx_open - open a unix 98 pty master | |
791 | * @inode: inode of device file | |
792 | * @filp: file pointer to tty | |
793 | * | |
794 | * Allocate a unix98 pty master device from the ptmx driver. | |
795 | * | |
796 | * Locking: tty_mutex protects the init_dev work. tty->count should | |
b9f8033f | 797 | * protect the rest. |
d81ed103 AC |
798 | * allocated_ptys_lock handles the list of free pty numbers |
799 | */ | |
800 | ||
64ba3dc3 | 801 | static int ptmx_open(struct inode *inode, struct file *filp) |
d81ed103 | 802 | { |
67245ff3 | 803 | struct pts_fs_info *fsi; |
d81ed103 | 804 | struct tty_struct *tty; |
8ead9dd5 | 805 | struct dentry *dentry; |
d81ed103 AC |
806 | int retval; |
807 | int index; | |
808 | ||
809 | nonseekable_open(inode, filp); | |
810 | ||
b0b88565 LT |
811 | /* We refuse fsnotify events on ptmx, since it's a shared resource */ |
812 | filp->f_mode |= FMODE_NONOTIFY; | |
813 | ||
fa90e1c9 JS |
814 | retval = tty_alloc_file(filp); |
815 | if (retval) | |
816 | return retval; | |
817 | ||
143c97cc | 818 | fsi = devpts_acquire(filp); |
eedf265a EB |
819 | if (IS_ERR(fsi)) { |
820 | retval = PTR_ERR(fsi); | |
67245ff3 | 821 | goto out_free_file; |
eedf265a | 822 | } |
67245ff3 | 823 | |
d81ed103 | 824 | /* find a device that is not in use. */ |
89c8d91e | 825 | mutex_lock(&devpts_mutex); |
67245ff3 | 826 | index = devpts_new_index(fsi); |
89c8d91e AC |
827 | mutex_unlock(&devpts_mutex); |
828 | ||
67245ff3 LT |
829 | retval = index; |
830 | if (index < 0) | |
eedf265a | 831 | goto out_put_fsi; |
d81ed103 | 832 | |
d81ed103 | 833 | |
67245ff3 LT |
834 | mutex_lock(&tty_mutex); |
835 | tty = tty_init_dev(ptm_driver, index); | |
89c8d91e AC |
836 | /* The tty returned here is locked so we can safely |
837 | drop the mutex */ | |
838 | mutex_unlock(&tty_mutex); | |
839 | ||
67245ff3 LT |
840 | retval = PTR_ERR(tty); |
841 | if (IS_ERR(tty)) | |
842 | goto out; | |
ee2ffa0d | 843 | |
2831c89f | 844 | /* |
67245ff3 LT |
845 | * From here on out, the tty is "live", and the index and |
846 | * fsi will be killed/put by the tty_release() | |
2831c89f | 847 | */ |
67245ff3 LT |
848 | set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ |
849 | tty->driver_data = fsi; | |
2831c89f | 850 | |
fa90e1c9 | 851 | tty_add_file(tty, filp); |
d81ed103 | 852 | |
8ead9dd5 LT |
853 | dentry = devpts_pty_new(fsi, index, tty->link); |
854 | if (IS_ERR(dentry)) { | |
855 | retval = PTR_ERR(dentry); | |
1177c0ef | 856 | goto err_release; |
162b97cf | 857 | } |
311fc65c | 858 | tty->link->driver_data = dentry; |
d81ed103 AC |
859 | |
860 | retval = ptm_driver->ops->open(tty, filp); | |
64ba3dc3 | 861 | if (retval) |
311fc65c | 862 | goto err_release; |
1177c0ef | 863 | |
d435cefe | 864 | tty_debug_hangup(tty, "opening (count=%d)\n", tty->count); |
d6847793 | 865 | |
89c8d91e | 866 | tty_unlock(tty); |
1177c0ef JS |
867 | return 0; |
868 | err_release: | |
89c8d91e | 869 | tty_unlock(tty); |
67245ff3 | 870 | // This will also put-ref the fsi |
eeb89d91 | 871 | tty_release(inode, filp); |
d81ed103 AC |
872 | return retval; |
873 | out: | |
67245ff3 | 874 | devpts_kill_index(fsi, index); |
eedf265a EB |
875 | out_put_fsi: |
876 | devpts_release(fsi); | |
67245ff3 | 877 | out_free_file: |
fa90e1c9 | 878 | tty_free_file(filp); |
64ba3dc3 | 879 | return retval; |
d81ed103 AC |
880 | } |
881 | ||
d2ec3f77 | 882 | static struct file_operations ptmx_fops __ro_after_init; |
d81ed103 | 883 | |
1da177e4 LT |
884 | static void __init unix98_pty_init(void) |
885 | { | |
21aca2fa JS |
886 | ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
887 | TTY_DRIVER_RESET_TERMIOS | | |
888 | TTY_DRIVER_REAL_RAW | | |
889 | TTY_DRIVER_DYNAMIC_DEV | | |
890 | TTY_DRIVER_DEVPTS_MEM | | |
891 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 892 | if (IS_ERR(ptm_driver)) |
1da177e4 | 893 | panic("Couldn't allocate Unix98 ptm driver"); |
21aca2fa JS |
894 | pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
895 | TTY_DRIVER_RESET_TERMIOS | | |
896 | TTY_DRIVER_REAL_RAW | | |
897 | TTY_DRIVER_DYNAMIC_DEV | | |
898 | TTY_DRIVER_DEVPTS_MEM | | |
899 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 900 | if (IS_ERR(pts_driver)) |
1da177e4 LT |
901 | panic("Couldn't allocate Unix98 pts driver"); |
902 | ||
1da177e4 LT |
903 | ptm_driver->driver_name = "pty_master"; |
904 | ptm_driver->name = "ptm"; | |
905 | ptm_driver->major = UNIX98_PTY_MASTER_MAJOR; | |
906 | ptm_driver->minor_start = 0; | |
907 | ptm_driver->type = TTY_DRIVER_TYPE_PTY; | |
908 | ptm_driver->subtype = PTY_TYPE_MASTER; | |
909 | ptm_driver->init_termios = tty_std_termios; | |
910 | ptm_driver->init_termios.c_iflag = 0; | |
911 | ptm_driver->init_termios.c_oflag = 0; | |
912 | ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
913 | ptm_driver->init_termios.c_lflag = 0; | |
606d099c AC |
914 | ptm_driver->init_termios.c_ispeed = 38400; |
915 | ptm_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 916 | ptm_driver->other = pts_driver; |
feebed65 | 917 | tty_set_operations(ptm_driver, &ptm_unix98_ops); |
1da177e4 | 918 | |
1da177e4 LT |
919 | pts_driver->driver_name = "pty_slave"; |
920 | pts_driver->name = "pts"; | |
921 | pts_driver->major = UNIX98_PTY_SLAVE_MAJOR; | |
922 | pts_driver->minor_start = 0; | |
923 | pts_driver->type = TTY_DRIVER_TYPE_PTY; | |
924 | pts_driver->subtype = PTY_TYPE_SLAVE; | |
925 | pts_driver->init_termios = tty_std_termios; | |
926 | pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
927 | pts_driver->init_termios.c_ispeed = 38400; |
928 | pts_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 929 | pts_driver->other = ptm_driver; |
99f1fe18 | 930 | tty_set_operations(pts_driver, &pty_unix98_ops); |
fe9cd962 | 931 | |
1da177e4 LT |
932 | if (tty_register_driver(ptm_driver)) |
933 | panic("Couldn't register Unix98 ptm driver"); | |
934 | if (tty_register_driver(pts_driver)) | |
935 | panic("Couldn't register Unix98 pts driver"); | |
936 | ||
d81ed103 AC |
937 | /* Now create the /dev/ptmx special device */ |
938 | tty_default_fops(&ptmx_fops); | |
939 | ptmx_fops.open = ptmx_open; | |
940 | ||
941 | cdev_init(&ptmx_cdev, &ptmx_fops); | |
942 | if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) || | |
943 | register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0) | |
82f8c35f | 944 | panic("Couldn't register /dev/ptmx driver"); |
d81ed103 | 945 | device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); |
1da177e4 | 946 | } |
d81ed103 | 947 | |
1da177e4 LT |
948 | #else |
949 | static inline void unix98_pty_init(void) { } | |
950 | #endif | |
951 | ||
952 | static int __init pty_init(void) | |
953 | { | |
954 | legacy_pty_init(); | |
955 | unix98_pty_init(); | |
956 | return 0; | |
957 | } | |
7154988f | 958 | device_initcall(pty_init); |