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> | |
50f45326 | 31 | #include <linux/compat.h> |
98602c01 | 32 | #include "tty.h" |
1da177e4 | 33 | |
d6847793 PH |
34 | #undef TTY_DEBUG_HANGUP |
35 | #ifdef TTY_DEBUG_HANGUP | |
36 | # define tty_debug_hangup(tty, f, args...) tty_debug(tty, f, ##args) | |
37 | #else | |
38 | # define tty_debug_hangup(tty, f, args...) do {} while (0) | |
39 | #endif | |
fe9cd962 | 40 | |
1da177e4 | 41 | #ifdef CONFIG_UNIX98_PTYS |
da2bdf9a | 42 | static struct tty_driver *ptm_driver; |
1da177e4 | 43 | static struct tty_driver *pts_driver; |
d739e65b | 44 | static DEFINE_MUTEX(devpts_mutex); |
1da177e4 LT |
45 | #endif |
46 | ||
fe9cd962 | 47 | static void pty_close(struct tty_struct *tty, struct file *filp) |
1da177e4 | 48 | { |
fe9cd962 AC |
49 | if (tty->driver->subtype == PTY_TYPE_MASTER) |
50 | WARN_ON(tty->count > 1); | |
51 | else { | |
18900ca6 | 52 | if (tty_io_error(tty)) |
69939035 | 53 | return; |
1da177e4 LT |
54 | if (tty->count > 2) |
55 | return; | |
56 | } | |
69939035 | 57 | set_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
58 | wake_up_interruptible(&tty->read_wait); |
59 | wake_up_interruptible(&tty->write_wait); | |
64d608db JS |
60 | spin_lock_irq(&tty->ctrl.lock); |
61 | tty->ctrl.packet = false; | |
62 | spin_unlock_irq(&tty->ctrl.lock); | |
89c8d91e | 63 | /* Review - krefs on tty_link ?? */ |
1da177e4 LT |
64 | if (!tty->link) |
65 | return; | |
1da177e4 | 66 | set_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
0f40fbbc | 67 | wake_up_interruptible(&tty->link->read_wait); |
1da177e4 LT |
68 | wake_up_interruptible(&tty->link->write_wait); |
69 | if (tty->driver->subtype == PTY_TYPE_MASTER) { | |
c776b77a | 70 | set_bit(TTY_OTHER_CLOSED, &tty->flags); |
ce1000dd | 71 | #ifdef CONFIG_UNIX98_PTYS |
d739e65b | 72 | if (tty->driver == ptm_driver) { |
b9f8033f | 73 | mutex_lock(&devpts_mutex); |
311fc65c EB |
74 | if (tty->link->driver_data) |
75 | devpts_pty_kill(tty->link->driver_data); | |
b9f8033f | 76 | mutex_unlock(&devpts_mutex); |
d739e65b | 77 | } |
ce1000dd | 78 | #endif |
c776b77a | 79 | tty_vhangup(tty->link); |
1da177e4 LT |
80 | } |
81 | } | |
82 | ||
83 | /* | |
84 | * The unthrottle routine is called by the line discipline to signal | |
85 | * that it can receive more characters. For PTY's, the TTY_THROTTLED | |
86 | * flag is always set, to force the line discipline to always call the | |
fe9cd962 | 87 | * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE |
1da177e4 LT |
88 | * characters in the queue. This is necessary since each time this |
89 | * happens, we need to wake up any sleeping processes that could be | |
90 | * (1) trying to send data to the pty, or (2) waiting in wait_until_sent() | |
91 | * for the pty buffer to be drained. | |
92 | */ | |
fe9cd962 | 93 | static void pty_unthrottle(struct tty_struct *tty) |
1da177e4 | 94 | { |
d945cb9c | 95 | tty_wakeup(tty->link); |
1da177e4 LT |
96 | set_bit(TTY_THROTTLED, &tty->flags); |
97 | } | |
98 | ||
d945cb9c AC |
99 | /** |
100 | * pty_write - write to a pty | |
101 | * @tty: the tty we write from | |
102 | * @buf: kernel buffer of data | |
fa441954 | 103 | * @c: bytes to write |
762faaed | 104 | * |
d945cb9c AC |
105 | * Our "hardware" write method. Data is coming from the ldisc which |
106 | * may be in a non sleeping state. We simply throw this at the other | |
107 | * end of the link as if we were an IRQ handler receiving stuff for | |
108 | * the other side of the pty/tty pair. | |
1da177e4 | 109 | */ |
d945cb9c | 110 | |
95713967 | 111 | static ssize_t pty_write(struct tty_struct *tty, const u8 *buf, size_t c) |
1da177e4 LT |
112 | { |
113 | struct tty_struct *to = tty->link; | |
1da177e4 | 114 | |
a501ab75 | 115 | if (tty->flow.stopped || !c) |
1da177e4 | 116 | return 0; |
d945cb9c | 117 | |
a501ab75 | 118 | return tty_insert_flip_string_and_push_buffer(to->port, buf, c); |
1da177e4 LT |
119 | } |
120 | ||
d945cb9c AC |
121 | /** |
122 | * pty_write_room - write space | |
123 | * @tty: tty we are writing from | |
124 | * | |
125 | * Report how many bytes the ldisc can send into the queue for | |
126 | * the other device. | |
127 | */ | |
128 | ||
03b3b1a2 | 129 | static unsigned int pty_write_room(struct tty_struct *tty) |
1da177e4 | 130 | { |
6e94dbc7 | 131 | if (tty->flow.stopped) |
85dfd81d | 132 | return 0; |
c81622ac | 133 | return tty_buffer_space_avail(tty->link->port); |
1da177e4 LT |
134 | } |
135 | ||
1da177e4 | 136 | /* Set the lock flag on a pty */ |
fe9cd962 | 137 | static int pty_set_lock(struct tty_struct *tty, int __user *arg) |
1da177e4 LT |
138 | { |
139 | int val; | |
202680c7 | 140 | |
fe9cd962 | 141 | if (get_user(val, arg)) |
1da177e4 LT |
142 | return -EFAULT; |
143 | if (val) | |
144 | set_bit(TTY_PTY_LOCK, &tty->flags); | |
145 | else | |
146 | clear_bit(TTY_PTY_LOCK, &tty->flags); | |
147 | return 0; | |
148 | } | |
149 | ||
84fd7bdf CG |
150 | static int pty_get_lock(struct tty_struct *tty, int __user *arg) |
151 | { | |
152 | int locked = test_bit(TTY_PTY_LOCK, &tty->flags); | |
202680c7 | 153 | |
84fd7bdf CG |
154 | return put_user(locked, arg); |
155 | } | |
156 | ||
06026d91 CG |
157 | /* Set the packet mode on a pty */ |
158 | static int pty_set_pktmode(struct tty_struct *tty, int __user *arg) | |
159 | { | |
06026d91 CG |
160 | int pktmode; |
161 | ||
162 | if (get_user(pktmode, arg)) | |
163 | return -EFAULT; | |
164 | ||
64d608db | 165 | spin_lock_irq(&tty->ctrl.lock); |
06026d91 | 166 | if (pktmode) { |
64d608db JS |
167 | if (!tty->ctrl.packet) { |
168 | tty->link->ctrl.pktstatus = 0; | |
2622d73e | 169 | smp_mb(); |
64d608db | 170 | tty->ctrl.packet = true; |
06026d91 CG |
171 | } |
172 | } else | |
64d608db JS |
173 | tty->ctrl.packet = false; |
174 | spin_unlock_irq(&tty->ctrl.lock); | |
06026d91 CG |
175 | |
176 | return 0; | |
177 | } | |
178 | ||
84fd7bdf CG |
179 | /* Get the packet mode of a pty */ |
180 | static int pty_get_pktmode(struct tty_struct *tty, int __user *arg) | |
181 | { | |
64d608db | 182 | int pktmode = tty->ctrl.packet; |
202680c7 | 183 | |
84fd7bdf CG |
184 | return put_user(pktmode, arg); |
185 | } | |
186 | ||
26df6d13 | 187 | /* Send a signal to the slave */ |
188 | static int pty_signal(struct tty_struct *tty, int sig) | |
189 | { | |
26df6d13 | 190 | struct pid *pgrp; |
191 | ||
37480a05 PH |
192 | if (sig != SIGINT && sig != SIGQUIT && sig != SIGTSTP) |
193 | return -EINVAL; | |
194 | ||
26df6d13 | 195 | if (tty->link) { |
5b239542 PH |
196 | pgrp = tty_get_pgrp(tty->link); |
197 | if (pgrp) | |
198 | kill_pgrp(pgrp, sig, 1); | |
26df6d13 | 199 | put_pid(pgrp); |
200 | } | |
201 | return 0; | |
202 | } | |
203 | ||
1da177e4 LT |
204 | static void pty_flush_buffer(struct tty_struct *tty) |
205 | { | |
206 | struct tty_struct *to = tty->link; | |
fe9cd962 | 207 | |
1da177e4 LT |
208 | if (!to) |
209 | return; | |
1d1d14da | 210 | |
77dae613 | 211 | tty_buffer_flush(to, NULL); |
64d608db JS |
212 | if (to->ctrl.packet) { |
213 | spin_lock_irq(&tty->ctrl.lock); | |
214 | tty->ctrl.pktstatus |= TIOCPKT_FLUSHWRITE; | |
1da177e4 | 215 | wake_up_interruptible(&to->read_wait); |
64d608db | 216 | spin_unlock_irq(&tty->ctrl.lock); |
1da177e4 LT |
217 | } |
218 | } | |
219 | ||
fe9cd962 | 220 | static int pty_open(struct tty_struct *tty, struct file *filp) |
1da177e4 | 221 | { |
1da177e4 | 222 | if (!tty || !tty->link) |
7c61c3d8 | 223 | return -ENODEV; |
69939035 | 224 | |
1da177e4 LT |
225 | if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) |
226 | goto out; | |
227 | if (test_bit(TTY_PTY_LOCK, &tty->link->flags)) | |
228 | goto out; | |
80cace72 | 229 | if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1) |
1da177e4 LT |
230 | goto out; |
231 | ||
69939035 | 232 | clear_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
233 | clear_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
234 | set_bit(TTY_THROTTLED, &tty->flags); | |
7c61c3d8 PH |
235 | return 0; |
236 | ||
1da177e4 | 237 | out: |
7c61c3d8 PH |
238 | set_bit(TTY_IO_ERROR, &tty->flags); |
239 | return -EIO; | |
1da177e4 LT |
240 | } |
241 | ||
fe9cd962 | 242 | static void pty_set_termios(struct tty_struct *tty, |
a8c11c15 | 243 | const struct ktermios *old_termios) |
1da177e4 | 244 | { |
dbfcd851 | 245 | /* See if packet mode change of state. */ |
64d608db | 246 | if (tty->link && tty->link->ctrl.packet) { |
9db276f8 | 247 | int extproc = (old_termios->c_lflag & EXTPROC) | L_EXTPROC(tty); |
dbfcd851 PH |
248 | int old_flow = ((old_termios->c_iflag & IXON) && |
249 | (old_termios->c_cc[VSTOP] == '\023') && | |
250 | (old_termios->c_cc[VSTART] == '\021')); | |
251 | int new_flow = (I_IXON(tty) && | |
252 | STOP_CHAR(tty) == '\023' && | |
253 | START_CHAR(tty) == '\021'); | |
254 | if ((old_flow != new_flow) || extproc) { | |
64d608db | 255 | spin_lock_irq(&tty->ctrl.lock); |
dbfcd851 | 256 | if (old_flow != new_flow) { |
64d608db | 257 | tty->ctrl.pktstatus &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); |
dbfcd851 | 258 | if (new_flow) |
64d608db | 259 | tty->ctrl.pktstatus |= TIOCPKT_DOSTOP; |
dbfcd851 | 260 | else |
64d608db | 261 | tty->ctrl.pktstatus |= TIOCPKT_NOSTOP; |
dbfcd851 PH |
262 | } |
263 | if (extproc) | |
64d608db JS |
264 | tty->ctrl.pktstatus |= TIOCPKT_IOCTL; |
265 | spin_unlock_irq(&tty->ctrl.lock); | |
dbfcd851 PH |
266 | wake_up_interruptible(&tty->link->read_wait); |
267 | } | |
268 | } | |
269 | ||
adc8d746 AC |
270 | tty->termios.c_cflag &= ~(CSIZE | PARENB); |
271 | tty->termios.c_cflag |= (CS8 | CREAD); | |
1da177e4 LT |
272 | } |
273 | ||
fc6f6238 | 274 | /** |
f6038cf4 | 275 | * pty_resize - resize event |
fc6f6238 | 276 | * @tty: tty being resized |
c774bda2 | 277 | * @ws: window size being set. |
fc6f6238 | 278 | * |
3ad2f3fb | 279 | * Update the termios variables and send the necessary signals to |
fc6f6238 AC |
280 | * peform a terminal resize correctly |
281 | */ | |
282 | ||
159a8e92 | 283 | static int pty_resize(struct tty_struct *tty, struct winsize *ws) |
fc6f6238 AC |
284 | { |
285 | struct pid *pgrp, *rpgrp; | |
fc6f6238 AC |
286 | struct tty_struct *pty = tty->link; |
287 | ||
288 | /* For a PTY we need to lock the tty side */ | |
dee4a0be | 289 | mutex_lock(&tty->winsize_mutex); |
fc6f6238 AC |
290 | if (!memcmp(ws, &tty->winsize, sizeof(*ws))) |
291 | goto done; | |
292 | ||
5b239542 PH |
293 | /* Signal the foreground process group of both ptys */ |
294 | pgrp = tty_get_pgrp(tty); | |
295 | rpgrp = tty_get_pgrp(pty); | |
fc6f6238 AC |
296 | |
297 | if (pgrp) | |
298 | kill_pgrp(pgrp, SIGWINCH, 1); | |
299 | if (rpgrp != pgrp && rpgrp) | |
300 | kill_pgrp(rpgrp, SIGWINCH, 1); | |
301 | ||
302 | put_pid(pgrp); | |
303 | put_pid(rpgrp); | |
304 | ||
305 | tty->winsize = *ws; | |
306 | pty->winsize = *ws; /* Never used so will go away soon */ | |
307 | done: | |
dee4a0be | 308 | mutex_unlock(&tty->winsize_mutex); |
fc6f6238 AC |
309 | return 0; |
310 | } | |
311 | ||
01adc807 PH |
312 | /** |
313 | * pty_start - start() handler | |
314 | * pty_stop - stop() handler | |
315 | * @tty: tty being flow-controlled | |
316 | * | |
317 | * Propagates the TIOCPKT status to the master pty. | |
318 | * | |
319 | * NB: only the master pty can be in packet mode so only the slave | |
320 | * needs start()/stop() handlers | |
321 | */ | |
322 | static void pty_start(struct tty_struct *tty) | |
323 | { | |
324 | unsigned long flags; | |
325 | ||
64d608db JS |
326 | if (tty->link && tty->link->ctrl.packet) { |
327 | spin_lock_irqsave(&tty->ctrl.lock, flags); | |
328 | tty->ctrl.pktstatus &= ~TIOCPKT_STOP; | |
329 | tty->ctrl.pktstatus |= TIOCPKT_START; | |
330 | spin_unlock_irqrestore(&tty->ctrl.lock, flags); | |
a9a08845 | 331 | wake_up_interruptible_poll(&tty->link->read_wait, EPOLLIN); |
01adc807 | 332 | } |
01adc807 PH |
333 | } |
334 | ||
335 | static void pty_stop(struct tty_struct *tty) | |
336 | { | |
337 | unsigned long flags; | |
338 | ||
64d608db JS |
339 | if (tty->link && tty->link->ctrl.packet) { |
340 | spin_lock_irqsave(&tty->ctrl.lock, flags); | |
341 | tty->ctrl.pktstatus &= ~TIOCPKT_START; | |
342 | tty->ctrl.pktstatus |= TIOCPKT_STOP; | |
343 | spin_unlock_irqrestore(&tty->ctrl.lock, flags); | |
a9a08845 | 344 | wake_up_interruptible_poll(&tty->link->read_wait, EPOLLIN); |
01adc807 | 345 | } |
01adc807 PH |
346 | } |
347 | ||
d155255a AC |
348 | /** |
349 | * pty_common_install - set up the pty pair | |
350 | * @driver: the pty driver | |
351 | * @tty: the tty being instantiated | |
2c964a2f | 352 | * @legacy: true if this is BSD style |
d155255a AC |
353 | * |
354 | * Perform the initial set up for the tty/pty pair. Called from the | |
355 | * tty layer when the port is first opened. | |
356 | * | |
357 | * Locking: the caller must hold the tty_mutex | |
358 | */ | |
5d249bc6 JS |
359 | static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty, |
360 | bool legacy) | |
bf970ee4 AC |
361 | { |
362 | struct tty_struct *o_tty; | |
d03702a2 | 363 | struct tty_port *ports[2]; |
bf970ee4 | 364 | int idx = tty->index; |
5d249bc6 | 365 | int retval = -ENOMEM; |
bf970ee4 | 366 | |
55199ea3 PH |
367 | /* Opening the slave first has always returned -EIO */ |
368 | if (driver->subtype != PTY_TYPE_MASTER) | |
369 | return -EIO; | |
370 | ||
d03702a2 JS |
371 | ports[0] = kmalloc(sizeof **ports, GFP_KERNEL); |
372 | ports[1] = kmalloc(sizeof **ports, GFP_KERNEL); | |
6f9ea7ad | 373 | if (!ports[0] || !ports[1]) |
2c964a2f | 374 | goto err; |
bf970ee4 AC |
375 | if (!try_module_get(driver->other->owner)) { |
376 | /* This cannot in fact currently happen */ | |
2c964a2f | 377 | goto err; |
bf970ee4 | 378 | } |
2c964a2f RV |
379 | o_tty = alloc_tty_struct(driver->other, idx); |
380 | if (!o_tty) | |
381 | goto err_put_module; | |
bf970ee4 | 382 | |
2febdb63 | 383 | tty_set_lock_subclass(o_tty); |
d2b6f447 | 384 | lockdep_set_subclass(&o_tty->termios_rwsem, TTY_LOCK_SLAVE); |
2febdb63 | 385 | |
5d249bc6 JS |
386 | if (legacy) { |
387 | /* We always use new tty termios data so we can do this | |
388 | the easy way .. */ | |
a3123fd0 PH |
389 | tty_init_termios(tty); |
390 | tty_init_termios(o_tty); | |
5d249bc6 JS |
391 | |
392 | driver->other->ttys[idx] = o_tty; | |
393 | driver->ttys[idx] = tty; | |
394 | } else { | |
adc8d746 AC |
395 | memset(&tty->termios_locked, 0, sizeof(tty->termios_locked)); |
396 | tty->termios = driver->init_termios; | |
397 | memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked)); | |
398 | o_tty->termios = driver->other->init_termios; | |
5d249bc6 | 399 | } |
fe9cd962 | 400 | |
bf970ee4 AC |
401 | /* |
402 | * Everything allocated ... set up the o_tty structure. | |
403 | */ | |
bf970ee4 | 404 | tty_driver_kref_get(driver->other); |
bf970ee4 AC |
405 | /* Establish the links in both directions */ |
406 | tty->link = o_tty; | |
407 | o_tty->link = tty; | |
d03702a2 JS |
408 | tty_port_init(ports[0]); |
409 | tty_port_init(ports[1]); | |
c81622ac PH |
410 | tty_buffer_set_limit(ports[0], 8192); |
411 | tty_buffer_set_limit(ports[1], 8192); | |
d03702a2 JS |
412 | o_tty->port = ports[0]; |
413 | tty->port = ports[1]; | |
967fab69 | 414 | o_tty->port->itty = o_tty; |
bf970ee4 | 415 | |
1d1d14da PH |
416 | tty_buffer_set_lock_subclass(o_tty->port); |
417 | ||
bf970ee4 AC |
418 | tty_driver_kref_get(driver); |
419 | tty->count++; | |
55199ea3 | 420 | o_tty->count++; |
bf970ee4 | 421 | return 0; |
a3123fd0 | 422 | |
2c964a2f | 423 | err_put_module: |
07584d4a | 424 | module_put(driver->other->owner); |
2c964a2f | 425 | err: |
d03702a2 JS |
426 | kfree(ports[0]); |
427 | kfree(ports[1]); | |
8a1b8d70 | 428 | return retval; |
bf970ee4 AC |
429 | } |
430 | ||
d03702a2 JS |
431 | static void pty_cleanup(struct tty_struct *tty) |
432 | { | |
81c79838 | 433 | tty_port_put(tty->port); |
d03702a2 JS |
434 | } |
435 | ||
5d249bc6 JS |
436 | /* Traditional BSD devices */ |
437 | #ifdef CONFIG_LEGACY_PTYS | |
438 | ||
439 | static int pty_install(struct tty_driver *driver, struct tty_struct *tty) | |
440 | { | |
441 | return pty_common_install(driver, tty, true); | |
442 | } | |
443 | ||
d155255a AC |
444 | static void pty_remove(struct tty_driver *driver, struct tty_struct *tty) |
445 | { | |
446 | struct tty_struct *pair = tty->link; | |
202680c7 | 447 | |
d155255a AC |
448 | driver->ttys[tty->index] = NULL; |
449 | if (pair) | |
450 | pair->driver->ttys[pair->index] = NULL; | |
451 | } | |
452 | ||
6caa76b7 | 453 | static int pty_bsd_ioctl(struct tty_struct *tty, |
1da177e4 LT |
454 | unsigned int cmd, unsigned long arg) |
455 | { | |
456 | switch (cmd) { | |
457 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
458 | return pty_set_lock(tty, (int __user *) arg); | |
84fd7bdf CG |
459 | case TIOCGPTLCK: /* Get PT Lock status */ |
460 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
461 | case TIOCPKT: /* Set PT packet mode */ |
462 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
463 | case TIOCGPKT: /* Get PT packet mode */ |
464 | return pty_get_pktmode(tty, (int __user *)arg); | |
26df6d13 | 465 | case TIOCSIG: /* Send signal to other side of pty */ |
466 | return pty_signal(tty, (int) arg); | |
ded2f295 JS |
467 | case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */ |
468 | return -EINVAL; | |
1da177e4 LT |
469 | } |
470 | return -ENOIOCTLCMD; | |
471 | } | |
472 | ||
50f45326 | 473 | #ifdef CONFIG_COMPAT |
5f0f187f AS |
474 | static long pty_bsd_compat_ioctl(struct tty_struct *tty, |
475 | unsigned int cmd, unsigned long arg) | |
476 | { | |
477 | /* | |
478 | * PTY ioctls don't require any special translation between 32-bit and | |
479 | * 64-bit userspace, they are already compatible. | |
480 | */ | |
50f45326 | 481 | return pty_bsd_ioctl(tty, cmd, (unsigned long)compat_ptr(arg)); |
5f0f187f | 482 | } |
50f45326 AV |
483 | #else |
484 | #define pty_bsd_compat_ioctl NULL | |
485 | #endif | |
5f0f187f | 486 | |
dc8c8587 | 487 | static int legacy_count = CONFIG_LEGACY_PTY_COUNT; |
7154988f PG |
488 | /* |
489 | * not really modular, but the easiest way to keep compat with existing | |
490 | * bootargs behaviour is to continue using module_param here. | |
491 | */ | |
dc8c8587 KS |
492 | module_param(legacy_count, int, 0); |
493 | ||
342a5971 LT |
494 | /* |
495 | * The master side of a pty can do TIOCSPTLCK and thus | |
496 | * has pty_bsd_ioctl. | |
497 | */ | |
498 | static const struct tty_operations master_pty_ops_bsd = { | |
499 | .install = pty_install, | |
3e8e88ca AC |
500 | .open = pty_open, |
501 | .close = pty_close, | |
502 | .write = pty_write, | |
503 | .write_room = pty_write_room, | |
504 | .flush_buffer = pty_flush_buffer, | |
3e8e88ca | 505 | .unthrottle = pty_unthrottle, |
3e8e88ca | 506 | .ioctl = pty_bsd_ioctl, |
5f0f187f | 507 | .compat_ioctl = pty_bsd_compat_ioctl, |
d03702a2 | 508 | .cleanup = pty_cleanup, |
d155255a AC |
509 | .resize = pty_resize, |
510 | .remove = pty_remove | |
3e8e88ca AC |
511 | }; |
512 | ||
342a5971 LT |
513 | static const struct tty_operations slave_pty_ops_bsd = { |
514 | .install = pty_install, | |
515 | .open = pty_open, | |
516 | .close = pty_close, | |
517 | .write = pty_write, | |
518 | .write_room = pty_write_room, | |
519 | .flush_buffer = pty_flush_buffer, | |
342a5971 LT |
520 | .unthrottle = pty_unthrottle, |
521 | .set_termios = pty_set_termios, | |
d03702a2 | 522 | .cleanup = pty_cleanup, |
d155255a | 523 | .resize = pty_resize, |
01adc807 PH |
524 | .start = pty_start, |
525 | .stop = pty_stop, | |
d155255a | 526 | .remove = pty_remove |
342a5971 LT |
527 | }; |
528 | ||
1da177e4 LT |
529 | static void __init legacy_pty_init(void) |
530 | { | |
342a5971 LT |
531 | struct tty_driver *pty_driver, *pty_slave_driver; |
532 | ||
dc8c8587 KS |
533 | if (legacy_count <= 0) |
534 | return; | |
1da177e4 | 535 | |
21aca2fa JS |
536 | pty_driver = tty_alloc_driver(legacy_count, |
537 | TTY_DRIVER_RESET_TERMIOS | | |
538 | TTY_DRIVER_REAL_RAW | | |
539 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 540 | if (IS_ERR(pty_driver)) |
1da177e4 LT |
541 | panic("Couldn't allocate pty driver"); |
542 | ||
21aca2fa JS |
543 | pty_slave_driver = tty_alloc_driver(legacy_count, |
544 | TTY_DRIVER_RESET_TERMIOS | | |
545 | TTY_DRIVER_REAL_RAW | | |
546 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 547 | if (IS_ERR(pty_slave_driver)) |
1da177e4 LT |
548 | panic("Couldn't allocate pty slave driver"); |
549 | ||
1da177e4 LT |
550 | pty_driver->driver_name = "pty_master"; |
551 | pty_driver->name = "pty"; | |
1da177e4 LT |
552 | pty_driver->major = PTY_MASTER_MAJOR; |
553 | pty_driver->minor_start = 0; | |
554 | pty_driver->type = TTY_DRIVER_TYPE_PTY; | |
555 | pty_driver->subtype = PTY_TYPE_MASTER; | |
556 | pty_driver->init_termios = tty_std_termios; | |
557 | pty_driver->init_termios.c_iflag = 0; | |
558 | pty_driver->init_termios.c_oflag = 0; | |
559 | pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
560 | pty_driver->init_termios.c_lflag = 0; | |
606d099c AC |
561 | pty_driver->init_termios.c_ispeed = 38400; |
562 | pty_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 563 | pty_driver->other = pty_slave_driver; |
342a5971 | 564 | tty_set_operations(pty_driver, &master_pty_ops_bsd); |
1da177e4 | 565 | |
1da177e4 LT |
566 | pty_slave_driver->driver_name = "pty_slave"; |
567 | pty_slave_driver->name = "ttyp"; | |
1da177e4 LT |
568 | pty_slave_driver->major = PTY_SLAVE_MAJOR; |
569 | pty_slave_driver->minor_start = 0; | |
570 | pty_slave_driver->type = TTY_DRIVER_TYPE_PTY; | |
571 | pty_slave_driver->subtype = PTY_TYPE_SLAVE; | |
572 | pty_slave_driver->init_termios = tty_std_termios; | |
573 | pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
574 | pty_slave_driver->init_termios.c_ispeed = 38400; |
575 | pty_slave_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 576 | pty_slave_driver->other = pty_driver; |
342a5971 | 577 | tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd); |
1da177e4 LT |
578 | |
579 | if (tty_register_driver(pty_driver)) | |
580 | panic("Couldn't register pty driver"); | |
581 | if (tty_register_driver(pty_slave_driver)) | |
582 | panic("Couldn't register pty slave driver"); | |
583 | } | |
584 | #else | |
585 | static inline void legacy_pty_init(void) { } | |
586 | #endif | |
587 | ||
588 | /* Unix98 devices */ | |
589 | #ifdef CONFIG_UNIX98_PTYS | |
d81ed103 AC |
590 | static struct cdev ptmx_cdev; |
591 | ||
6509f309 | 592 | /** |
311fc65c EB |
593 | * ptm_open_peer - open the peer of a pty |
594 | * @master: the open struct file of the ptmx device node | |
595 | * @tty: the master of the pty being opened | |
596 | * @flags: the flags for open | |
6509f309 | 597 | * |
311fc65c EB |
598 | * Provide a race free way for userspace to open the slave end of a pty |
599 | * (where they have the master fd and cannot access or trust the mount | |
600 | * namespace /dev/pts was mounted inside). | |
6509f309 | 601 | */ |
311fc65c | 602 | int ptm_open_peer(struct file *master, struct tty_struct *tty, int flags) |
6509f309 | 603 | { |
4503b1c2 | 604 | int fd; |
311fc65c | 605 | struct file *filp; |
6509f309 | 606 | int retval = -EINVAL; |
311fc65c EB |
607 | struct path path; |
608 | ||
609 | if (tty->driver != ptm_driver) | |
610 | return -EIO; | |
6509f309 | 611 | |
36ecc148 | 612 | fd = get_unused_fd_flags(flags); |
6509f309 AB |
613 | if (fd < 0) { |
614 | retval = fd; | |
615 | goto err; | |
616 | } | |
617 | ||
311fc65c EB |
618 | /* Compute the slave's path */ |
619 | path.mnt = devpts_mntget(master, tty->driver_data); | |
620 | if (IS_ERR(path.mnt)) { | |
621 | retval = PTR_ERR(path.mnt); | |
622 | goto err_put; | |
623 | } | |
624 | path.dentry = tty->link->driver_data; | |
625 | ||
626 | filp = dentry_open(&path, flags, current_cred()); | |
627 | mntput(path.mnt); | |
6509f309 AB |
628 | if (IS_ERR(filp)) { |
629 | retval = PTR_ERR(filp); | |
630 | goto err_put; | |
631 | } | |
632 | ||
633 | fd_install(fd, filp); | |
634 | return fd; | |
635 | ||
636 | err_put: | |
637 | put_unused_fd(fd); | |
638 | err: | |
639 | return retval; | |
640 | } | |
641 | ||
6caa76b7 | 642 | static int pty_unix98_ioctl(struct tty_struct *tty, |
1da177e4 LT |
643 | unsigned int cmd, unsigned long arg) |
644 | { | |
645 | switch (cmd) { | |
646 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
647 | return pty_set_lock(tty, (int __user *)arg); | |
84fd7bdf CG |
648 | case TIOCGPTLCK: /* Get PT Lock status */ |
649 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
650 | case TIOCPKT: /* Set PT packet mode */ |
651 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
652 | case TIOCGPKT: /* Get PT packet mode */ |
653 | return pty_get_pktmode(tty, (int __user *)arg); | |
1da177e4 LT |
654 | case TIOCGPTN: /* Get PT Number */ |
655 | return put_user(tty->index, (unsigned int __user *)arg); | |
26df6d13 | 656 | case TIOCSIG: /* Send signal to other side of pty */ |
657 | return pty_signal(tty, (int) arg); | |
1da177e4 LT |
658 | } |
659 | ||
660 | return -ENOIOCTLCMD; | |
661 | } | |
662 | ||
50f45326 | 663 | #ifdef CONFIG_COMPAT |
5f0f187f AS |
664 | static long pty_unix98_compat_ioctl(struct tty_struct *tty, |
665 | unsigned int cmd, unsigned long arg) | |
666 | { | |
667 | /* | |
668 | * PTY ioctls don't require any special translation between 32-bit and | |
669 | * 64-bit userspace, they are already compatible. | |
670 | */ | |
50f45326 AV |
671 | return pty_unix98_ioctl(tty, cmd, |
672 | cmd == TIOCSIG ? arg : (unsigned long)compat_ptr(arg)); | |
5f0f187f | 673 | } |
50f45326 AV |
674 | #else |
675 | #define pty_unix98_compat_ioctl NULL | |
676 | #endif | |
5f0f187f | 677 | |
99f1fe18 AC |
678 | /** |
679 | * ptm_unix98_lookup - find a pty master | |
680 | * @driver: ptm driver | |
0b0a66a5 | 681 | * @file: unused |
99f1fe18 AC |
682 | * @idx: tty index |
683 | * | |
684 | * Look up a pty master device. Called under the tty_mutex for now. | |
685 | * This provides our locking. | |
686 | */ | |
687 | ||
15f1a633 | 688 | static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, |
8ead9dd5 | 689 | struct file *file, int idx) |
99f1fe18 | 690 | { |
593a27c4 KK |
691 | /* Master must be open via /dev/ptmx */ |
692 | return ERR_PTR(-EIO); | |
99f1fe18 AC |
693 | } |
694 | ||
695 | /** | |
696 | * pts_unix98_lookup - find a pty slave | |
697 | * @driver: pts driver | |
0b0a66a5 | 698 | * @file: file pointer to tty |
99f1fe18 AC |
699 | * @idx: tty index |
700 | * | |
701 | * Look up a pty master device. Called under the tty_mutex for now. | |
d739e65b | 702 | * This provides our locking for the tty pointer. |
99f1fe18 AC |
703 | */ |
704 | ||
15f1a633 | 705 | static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver, |
8ead9dd5 | 706 | struct file *file, int idx) |
99f1fe18 | 707 | { |
d739e65b AC |
708 | struct tty_struct *tty; |
709 | ||
710 | mutex_lock(&devpts_mutex); | |
8ead9dd5 | 711 | tty = devpts_get_priv(file->f_path.dentry); |
d739e65b | 712 | mutex_unlock(&devpts_mutex); |
99f1fe18 AC |
713 | /* Master must be open before slave */ |
714 | if (!tty) | |
715 | return ERR_PTR(-EIO); | |
716 | return tty; | |
717 | } | |
718 | ||
bf970ee4 | 719 | static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty) |
8b0a88d5 | 720 | { |
5d249bc6 | 721 | return pty_common_install(driver, tty, false); |
8b0a88d5 AC |
722 | } |
723 | ||
f4b208eb | 724 | /* this is called once with whichever end is closed last */ |
c1e33af1 | 725 | static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty) |
f4b208eb | 726 | { |
67245ff3 | 727 | struct pts_fs_info *fsi; |
2831c89f HK |
728 | |
729 | if (tty->driver->subtype == PTY_TYPE_MASTER) | |
67245ff3 | 730 | fsi = tty->driver_data; |
2831c89f | 731 | else |
67245ff3 | 732 | fsi = tty->link->driver_data; |
5353ed8d CIK |
733 | |
734 | if (fsi) { | |
735 | devpts_kill_index(fsi, tty->index); | |
736 | devpts_release(fsi); | |
737 | } | |
f4b208eb JS |
738 | } |
739 | ||
d01c3289 MY |
740 | static void pty_show_fdinfo(struct tty_struct *tty, struct seq_file *m) |
741 | { | |
742 | seq_printf(m, "tty-index:\t%d\n", tty->index); | |
743 | } | |
744 | ||
feebed65 | 745 | static const struct tty_operations ptm_unix98_ops = { |
99f1fe18 | 746 | .lookup = ptm_unix98_lookup, |
bf970ee4 | 747 | .install = pty_unix98_install, |
7171604a | 748 | .remove = pty_unix98_remove, |
3e8e88ca AC |
749 | .open = pty_open, |
750 | .close = pty_close, | |
751 | .write = pty_write, | |
752 | .write_room = pty_write_room, | |
753 | .flush_buffer = pty_flush_buffer, | |
3e8e88ca | 754 | .unthrottle = pty_unthrottle, |
feebed65 | 755 | .ioctl = pty_unix98_ioctl, |
5f0f187f | 756 | .compat_ioctl = pty_unix98_compat_ioctl, |
36b3c070 | 757 | .resize = pty_resize, |
d01c3289 MY |
758 | .cleanup = pty_cleanup, |
759 | .show_fdinfo = pty_show_fdinfo, | |
3e8e88ca AC |
760 | }; |
761 | ||
99f1fe18 AC |
762 | static const struct tty_operations pty_unix98_ops = { |
763 | .lookup = pts_unix98_lookup, | |
bf970ee4 | 764 | .install = pty_unix98_install, |
7171604a | 765 | .remove = pty_unix98_remove, |
99f1fe18 AC |
766 | .open = pty_open, |
767 | .close = pty_close, | |
768 | .write = pty_write, | |
769 | .write_room = pty_write_room, | |
770 | .flush_buffer = pty_flush_buffer, | |
99f1fe18 AC |
771 | .unthrottle = pty_unthrottle, |
772 | .set_termios = pty_set_termios, | |
01adc807 PH |
773 | .start = pty_start, |
774 | .stop = pty_stop, | |
d03702a2 | 775 | .cleanup = pty_cleanup, |
99f1fe18 | 776 | }; |
d81ed103 AC |
777 | |
778 | /** | |
779 | * ptmx_open - open a unix 98 pty master | |
780 | * @inode: inode of device file | |
781 | * @filp: file pointer to tty | |
782 | * | |
783 | * Allocate a unix98 pty master device from the ptmx driver. | |
784 | * | |
785 | * Locking: tty_mutex protects the init_dev work. tty->count should | |
b9f8033f | 786 | * protect the rest. |
d81ed103 AC |
787 | * allocated_ptys_lock handles the list of free pty numbers |
788 | */ | |
789 | ||
64ba3dc3 | 790 | static int ptmx_open(struct inode *inode, struct file *filp) |
d81ed103 | 791 | { |
67245ff3 | 792 | struct pts_fs_info *fsi; |
d81ed103 | 793 | struct tty_struct *tty; |
8ead9dd5 | 794 | struct dentry *dentry; |
d81ed103 AC |
795 | int retval; |
796 | int index; | |
797 | ||
798 | nonseekable_open(inode, filp); | |
799 | ||
b0b88565 LT |
800 | /* We refuse fsnotify events on ptmx, since it's a shared resource */ |
801 | filp->f_mode |= FMODE_NONOTIFY; | |
802 | ||
fa90e1c9 JS |
803 | retval = tty_alloc_file(filp); |
804 | if (retval) | |
805 | return retval; | |
806 | ||
143c97cc | 807 | fsi = devpts_acquire(filp); |
eedf265a EB |
808 | if (IS_ERR(fsi)) { |
809 | retval = PTR_ERR(fsi); | |
67245ff3 | 810 | goto out_free_file; |
eedf265a | 811 | } |
67245ff3 | 812 | |
d81ed103 | 813 | /* find a device that is not in use. */ |
89c8d91e | 814 | mutex_lock(&devpts_mutex); |
67245ff3 | 815 | index = devpts_new_index(fsi); |
89c8d91e AC |
816 | mutex_unlock(&devpts_mutex); |
817 | ||
67245ff3 LT |
818 | retval = index; |
819 | if (index < 0) | |
eedf265a | 820 | goto out_put_fsi; |
d81ed103 | 821 | |
d81ed103 | 822 | |
67245ff3 LT |
823 | mutex_lock(&tty_mutex); |
824 | tty = tty_init_dev(ptm_driver, index); | |
89c8d91e AC |
825 | /* The tty returned here is locked so we can safely |
826 | drop the mutex */ | |
827 | mutex_unlock(&tty_mutex); | |
828 | ||
67245ff3 LT |
829 | retval = PTR_ERR(tty); |
830 | if (IS_ERR(tty)) | |
831 | goto out; | |
ee2ffa0d | 832 | |
2831c89f | 833 | /* |
67245ff3 LT |
834 | * From here on out, the tty is "live", and the index and |
835 | * fsi will be killed/put by the tty_release() | |
2831c89f | 836 | */ |
67245ff3 LT |
837 | set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ |
838 | tty->driver_data = fsi; | |
2831c89f | 839 | |
fa90e1c9 | 840 | tty_add_file(tty, filp); |
d81ed103 | 841 | |
8ead9dd5 LT |
842 | dentry = devpts_pty_new(fsi, index, tty->link); |
843 | if (IS_ERR(dentry)) { | |
844 | retval = PTR_ERR(dentry); | |
1177c0ef | 845 | goto err_release; |
162b97cf | 846 | } |
311fc65c | 847 | tty->link->driver_data = dentry; |
d81ed103 AC |
848 | |
849 | retval = ptm_driver->ops->open(tty, filp); | |
64ba3dc3 | 850 | if (retval) |
311fc65c | 851 | goto err_release; |
1177c0ef | 852 | |
d435cefe | 853 | tty_debug_hangup(tty, "opening (count=%d)\n", tty->count); |
d6847793 | 854 | |
89c8d91e | 855 | tty_unlock(tty); |
1177c0ef JS |
856 | return 0; |
857 | err_release: | |
89c8d91e | 858 | tty_unlock(tty); |
67245ff3 | 859 | // This will also put-ref the fsi |
eeb89d91 | 860 | tty_release(inode, filp); |
d81ed103 AC |
861 | return retval; |
862 | out: | |
67245ff3 | 863 | devpts_kill_index(fsi, index); |
eedf265a EB |
864 | out_put_fsi: |
865 | devpts_release(fsi); | |
67245ff3 | 866 | out_free_file: |
fa90e1c9 | 867 | tty_free_file(filp); |
64ba3dc3 | 868 | return retval; |
d81ed103 AC |
869 | } |
870 | ||
d2ec3f77 | 871 | static struct file_operations ptmx_fops __ro_after_init; |
d81ed103 | 872 | |
1da177e4 LT |
873 | static void __init unix98_pty_init(void) |
874 | { | |
21aca2fa JS |
875 | ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
876 | TTY_DRIVER_RESET_TERMIOS | | |
877 | TTY_DRIVER_REAL_RAW | | |
878 | TTY_DRIVER_DYNAMIC_DEV | | |
879 | TTY_DRIVER_DEVPTS_MEM | | |
880 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 881 | if (IS_ERR(ptm_driver)) |
1da177e4 | 882 | panic("Couldn't allocate Unix98 ptm driver"); |
21aca2fa JS |
883 | pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
884 | TTY_DRIVER_RESET_TERMIOS | | |
885 | TTY_DRIVER_REAL_RAW | | |
886 | TTY_DRIVER_DYNAMIC_DEV | | |
887 | TTY_DRIVER_DEVPTS_MEM | | |
888 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 889 | if (IS_ERR(pts_driver)) |
1da177e4 LT |
890 | panic("Couldn't allocate Unix98 pts driver"); |
891 | ||
1da177e4 LT |
892 | ptm_driver->driver_name = "pty_master"; |
893 | ptm_driver->name = "ptm"; | |
894 | ptm_driver->major = UNIX98_PTY_MASTER_MAJOR; | |
895 | ptm_driver->minor_start = 0; | |
896 | ptm_driver->type = TTY_DRIVER_TYPE_PTY; | |
897 | ptm_driver->subtype = PTY_TYPE_MASTER; | |
898 | ptm_driver->init_termios = tty_std_termios; | |
899 | ptm_driver->init_termios.c_iflag = 0; | |
900 | ptm_driver->init_termios.c_oflag = 0; | |
901 | ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
902 | ptm_driver->init_termios.c_lflag = 0; | |
606d099c AC |
903 | ptm_driver->init_termios.c_ispeed = 38400; |
904 | ptm_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 905 | ptm_driver->other = pts_driver; |
feebed65 | 906 | tty_set_operations(ptm_driver, &ptm_unix98_ops); |
1da177e4 | 907 | |
1da177e4 LT |
908 | pts_driver->driver_name = "pty_slave"; |
909 | pts_driver->name = "pts"; | |
910 | pts_driver->major = UNIX98_PTY_SLAVE_MAJOR; | |
911 | pts_driver->minor_start = 0; | |
912 | pts_driver->type = TTY_DRIVER_TYPE_PTY; | |
913 | pts_driver->subtype = PTY_TYPE_SLAVE; | |
914 | pts_driver->init_termios = tty_std_termios; | |
915 | pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
916 | pts_driver->init_termios.c_ispeed = 38400; |
917 | pts_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 918 | pts_driver->other = ptm_driver; |
99f1fe18 | 919 | tty_set_operations(pts_driver, &pty_unix98_ops); |
fe9cd962 | 920 | |
1da177e4 LT |
921 | if (tty_register_driver(ptm_driver)) |
922 | panic("Couldn't register Unix98 ptm driver"); | |
923 | if (tty_register_driver(pts_driver)) | |
924 | panic("Couldn't register Unix98 pts driver"); | |
925 | ||
d81ed103 AC |
926 | /* Now create the /dev/ptmx special device */ |
927 | tty_default_fops(&ptmx_fops); | |
928 | ptmx_fops.open = ptmx_open; | |
929 | ||
930 | cdev_init(&ptmx_cdev, &ptmx_fops); | |
931 | if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) || | |
932 | register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0) | |
82f8c35f | 933 | panic("Couldn't register /dev/ptmx driver"); |
862d8312 | 934 | device_create(&tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); |
1da177e4 | 935 | } |
d81ed103 | 936 | |
1da177e4 LT |
937 | #else |
938 | static inline void unix98_pty_init(void) { } | |
939 | #endif | |
940 | ||
941 | static int __init pty_init(void) | |
942 | { | |
943 | legacy_pty_init(); | |
944 | unix98_pty_init(); | |
945 | return 0; | |
946 | } | |
7154988f | 947 | device_initcall(pty_init); |