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Commit | Line | Data |
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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 | 10 | #include <linux/errno.h> |
1da177e4 LT |
11 | #include <linux/interrupt.h> |
12 | #include <linux/tty.h> | |
13 | #include <linux/tty_flip.h> | |
14 | #include <linux/fcntl.h> | |
3f07c014 | 15 | #include <linux/sched/signal.h> |
1da177e4 LT |
16 | #include <linux/string.h> |
17 | #include <linux/major.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/init.h> | |
d81ed103 | 20 | #include <linux/device.h> |
fe9cd962 | 21 | #include <linux/uaccess.h> |
1da177e4 LT |
22 | #include <linux/bitops.h> |
23 | #include <linux/devpts_fs.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
d739e65b | 25 | #include <linux/mutex.h> |
01adc807 | 26 | #include <linux/poll.h> |
54ebbfb1 AS |
27 | #include <linux/mount.h> |
28 | #include <linux/file.h> | |
29 | #include <linux/ioctl.h> | |
1da177e4 | 30 | |
d6847793 PH |
31 | #undef TTY_DEBUG_HANGUP |
32 | #ifdef TTY_DEBUG_HANGUP | |
33 | # define tty_debug_hangup(tty, f, args...) tty_debug(tty, f, ##args) | |
34 | #else | |
35 | # define tty_debug_hangup(tty, f, args...) do {} while (0) | |
36 | #endif | |
fe9cd962 | 37 | |
1da177e4 | 38 | #ifdef CONFIG_UNIX98_PTYS |
da2bdf9a | 39 | static struct tty_driver *ptm_driver; |
1da177e4 | 40 | static struct tty_driver *pts_driver; |
d739e65b | 41 | static DEFINE_MUTEX(devpts_mutex); |
1da177e4 LT |
42 | #endif |
43 | ||
fe9cd962 | 44 | static void pty_close(struct tty_struct *tty, struct file *filp) |
1da177e4 | 45 | { |
fe9cd962 AC |
46 | BUG_ON(!tty); |
47 | if (tty->driver->subtype == PTY_TYPE_MASTER) | |
48 | WARN_ON(tty->count > 1); | |
49 | else { | |
18900ca6 | 50 | if (tty_io_error(tty)) |
69939035 | 51 | return; |
1da177e4 LT |
52 | if (tty->count > 2) |
53 | return; | |
54 | } | |
69939035 | 55 | set_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
56 | wake_up_interruptible(&tty->read_wait); |
57 | wake_up_interruptible(&tty->write_wait); | |
4ed60fc2 | 58 | spin_lock_irq(&tty->ctrl_lock); |
1da177e4 | 59 | tty->packet = 0; |
4ed60fc2 | 60 | spin_unlock_irq(&tty->ctrl_lock); |
89c8d91e | 61 | /* Review - krefs on tty_link ?? */ |
1da177e4 LT |
62 | if (!tty->link) |
63 | return; | |
1da177e4 | 64 | set_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
0f40fbbc | 65 | wake_up_interruptible(&tty->link->read_wait); |
1da177e4 LT |
66 | wake_up_interruptible(&tty->link->write_wait); |
67 | if (tty->driver->subtype == PTY_TYPE_MASTER) { | |
68 | set_bit(TTY_OTHER_CLOSED, &tty->flags); | |
ce1000dd | 69 | #ifdef CONFIG_UNIX98_PTYS |
d739e65b | 70 | if (tty->driver == ptm_driver) { |
b9f8033f | 71 | mutex_lock(&devpts_mutex); |
54ebbfb1 AS |
72 | if (tty->link->driver_data) { |
73 | struct path *path = tty->link->driver_data; | |
74 | ||
75 | devpts_pty_kill(path->dentry); | |
76 | path_put(path); | |
77 | kfree(path); | |
78 | } | |
b9f8033f | 79 | mutex_unlock(&devpts_mutex); |
d739e65b | 80 | } |
ce1000dd | 81 | #endif |
11dbf203 | 82 | tty_vhangup(tty->link); |
1da177e4 LT |
83 | } |
84 | } | |
85 | ||
86 | /* | |
87 | * The unthrottle routine is called by the line discipline to signal | |
88 | * that it can receive more characters. For PTY's, the TTY_THROTTLED | |
89 | * flag is always set, to force the line discipline to always call the | |
fe9cd962 | 90 | * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE |
1da177e4 LT |
91 | * characters in the queue. This is necessary since each time this |
92 | * happens, we need to wake up any sleeping processes that could be | |
93 | * (1) trying to send data to the pty, or (2) waiting in wait_until_sent() | |
94 | * for the pty buffer to be drained. | |
95 | */ | |
fe9cd962 | 96 | static void pty_unthrottle(struct tty_struct *tty) |
1da177e4 | 97 | { |
d945cb9c | 98 | tty_wakeup(tty->link); |
1da177e4 LT |
99 | set_bit(TTY_THROTTLED, &tty->flags); |
100 | } | |
101 | ||
d945cb9c AC |
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; | |
c81622ac | 143 | return tty_buffer_space_avail(tty->link->port); |
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) { | |
06026d91 | 189 | tty->link->ctrl_status = 0; |
2622d73e PH |
190 | smp_mb(); |
191 | tty->packet = 1; | |
06026d91 CG |
192 | } |
193 | } else | |
194 | tty->packet = 0; | |
6054c16e | 195 | spin_unlock_irq(&tty->ctrl_lock); |
06026d91 CG |
196 | |
197 | return 0; | |
198 | } | |
199 | ||
84fd7bdf CG |
200 | /* Get the packet mode of a pty */ |
201 | static int pty_get_pktmode(struct tty_struct *tty, int __user *arg) | |
202 | { | |
203 | int pktmode = tty->packet; | |
204 | return put_user(pktmode, arg); | |
205 | } | |
206 | ||
26df6d13 | 207 | /* Send a signal to the slave */ |
208 | static int pty_signal(struct tty_struct *tty, int sig) | |
209 | { | |
26df6d13 | 210 | struct pid *pgrp; |
211 | ||
37480a05 PH |
212 | if (sig != SIGINT && sig != SIGQUIT && sig != SIGTSTP) |
213 | return -EINVAL; | |
214 | ||
26df6d13 | 215 | if (tty->link) { |
5b239542 PH |
216 | pgrp = tty_get_pgrp(tty->link); |
217 | if (pgrp) | |
218 | kill_pgrp(pgrp, sig, 1); | |
26df6d13 | 219 | put_pid(pgrp); |
220 | } | |
221 | return 0; | |
222 | } | |
223 | ||
1da177e4 LT |
224 | static void pty_flush_buffer(struct tty_struct *tty) |
225 | { | |
226 | struct tty_struct *to = tty->link; | |
fe9cd962 | 227 | |
1da177e4 LT |
228 | if (!to) |
229 | return; | |
1d1d14da | 230 | |
77dae613 | 231 | tty_buffer_flush(to, NULL); |
1da177e4 | 232 | if (to->packet) { |
6054c16e | 233 | spin_lock_irq(&tty->ctrl_lock); |
1da177e4 LT |
234 | tty->ctrl_status |= TIOCPKT_FLUSHWRITE; |
235 | wake_up_interruptible(&to->read_wait); | |
6054c16e | 236 | spin_unlock_irq(&tty->ctrl_lock); |
1da177e4 LT |
237 | } |
238 | } | |
239 | ||
fe9cd962 | 240 | static int pty_open(struct tty_struct *tty, struct file *filp) |
1da177e4 | 241 | { |
1da177e4 | 242 | if (!tty || !tty->link) |
7c61c3d8 | 243 | return -ENODEV; |
69939035 | 244 | |
1da177e4 LT |
245 | if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) |
246 | goto out; | |
247 | if (test_bit(TTY_PTY_LOCK, &tty->link->flags)) | |
248 | goto out; | |
80cace72 | 249 | if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1) |
1da177e4 LT |
250 | goto out; |
251 | ||
69939035 | 252 | clear_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
253 | clear_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
254 | set_bit(TTY_THROTTLED, &tty->flags); | |
7c61c3d8 PH |
255 | return 0; |
256 | ||
1da177e4 | 257 | out: |
7c61c3d8 PH |
258 | set_bit(TTY_IO_ERROR, &tty->flags); |
259 | return -EIO; | |
1da177e4 LT |
260 | } |
261 | ||
fe9cd962 AC |
262 | static void pty_set_termios(struct tty_struct *tty, |
263 | struct ktermios *old_termios) | |
1da177e4 | 264 | { |
dbfcd851 PH |
265 | /* See if packet mode change of state. */ |
266 | if (tty->link && tty->link->packet) { | |
9db276f8 | 267 | int extproc = (old_termios->c_lflag & EXTPROC) | L_EXTPROC(tty); |
dbfcd851 PH |
268 | int old_flow = ((old_termios->c_iflag & IXON) && |
269 | (old_termios->c_cc[VSTOP] == '\023') && | |
270 | (old_termios->c_cc[VSTART] == '\021')); | |
271 | int new_flow = (I_IXON(tty) && | |
272 | STOP_CHAR(tty) == '\023' && | |
273 | START_CHAR(tty) == '\021'); | |
274 | if ((old_flow != new_flow) || extproc) { | |
4d8c1dff | 275 | spin_lock_irq(&tty->ctrl_lock); |
dbfcd851 PH |
276 | if (old_flow != new_flow) { |
277 | tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); | |
278 | if (new_flow) | |
279 | tty->ctrl_status |= TIOCPKT_DOSTOP; | |
280 | else | |
281 | tty->ctrl_status |= TIOCPKT_NOSTOP; | |
282 | } | |
283 | if (extproc) | |
284 | tty->ctrl_status |= TIOCPKT_IOCTL; | |
4d8c1dff | 285 | spin_unlock_irq(&tty->ctrl_lock); |
dbfcd851 PH |
286 | wake_up_interruptible(&tty->link->read_wait); |
287 | } | |
288 | } | |
289 | ||
adc8d746 AC |
290 | tty->termios.c_cflag &= ~(CSIZE | PARENB); |
291 | tty->termios.c_cflag |= (CS8 | CREAD); | |
1da177e4 LT |
292 | } |
293 | ||
fc6f6238 AC |
294 | /** |
295 | * pty_do_resize - resize event | |
296 | * @tty: tty being resized | |
c774bda2 | 297 | * @ws: window size being set. |
fc6f6238 | 298 | * |
3ad2f3fb | 299 | * Update the termios variables and send the necessary signals to |
fc6f6238 AC |
300 | * peform a terminal resize correctly |
301 | */ | |
302 | ||
159a8e92 | 303 | static int pty_resize(struct tty_struct *tty, struct winsize *ws) |
fc6f6238 AC |
304 | { |
305 | struct pid *pgrp, *rpgrp; | |
fc6f6238 AC |
306 | struct tty_struct *pty = tty->link; |
307 | ||
308 | /* For a PTY we need to lock the tty side */ | |
dee4a0be | 309 | mutex_lock(&tty->winsize_mutex); |
fc6f6238 AC |
310 | if (!memcmp(ws, &tty->winsize, sizeof(*ws))) |
311 | goto done; | |
312 | ||
5b239542 PH |
313 | /* Signal the foreground process group of both ptys */ |
314 | pgrp = tty_get_pgrp(tty); | |
315 | rpgrp = tty_get_pgrp(pty); | |
fc6f6238 AC |
316 | |
317 | if (pgrp) | |
318 | kill_pgrp(pgrp, SIGWINCH, 1); | |
319 | if (rpgrp != pgrp && rpgrp) | |
320 | kill_pgrp(rpgrp, SIGWINCH, 1); | |
321 | ||
322 | put_pid(pgrp); | |
323 | put_pid(rpgrp); | |
324 | ||
325 | tty->winsize = *ws; | |
326 | pty->winsize = *ws; /* Never used so will go away soon */ | |
327 | done: | |
dee4a0be | 328 | mutex_unlock(&tty->winsize_mutex); |
fc6f6238 AC |
329 | return 0; |
330 | } | |
331 | ||
01adc807 PH |
332 | /** |
333 | * pty_start - start() handler | |
334 | * pty_stop - stop() handler | |
335 | * @tty: tty being flow-controlled | |
336 | * | |
337 | * Propagates the TIOCPKT status to the master pty. | |
338 | * | |
339 | * NB: only the master pty can be in packet mode so only the slave | |
340 | * needs start()/stop() handlers | |
341 | */ | |
342 | static void pty_start(struct tty_struct *tty) | |
343 | { | |
344 | unsigned long flags; | |
345 | ||
01adc807 | 346 | if (tty->link && tty->link->packet) { |
54e8e5fc | 347 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
01adc807 PH |
348 | tty->ctrl_status &= ~TIOCPKT_STOP; |
349 | tty->ctrl_status |= TIOCPKT_START; | |
54e8e5fc | 350 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
01adc807 PH |
351 | wake_up_interruptible_poll(&tty->link->read_wait, POLLIN); |
352 | } | |
01adc807 PH |
353 | } |
354 | ||
355 | static void pty_stop(struct tty_struct *tty) | |
356 | { | |
357 | unsigned long flags; | |
358 | ||
01adc807 | 359 | if (tty->link && tty->link->packet) { |
54e8e5fc | 360 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
01adc807 PH |
361 | tty->ctrl_status &= ~TIOCPKT_START; |
362 | tty->ctrl_status |= TIOCPKT_STOP; | |
54e8e5fc | 363 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
01adc807 PH |
364 | wake_up_interruptible_poll(&tty->link->read_wait, POLLIN); |
365 | } | |
01adc807 PH |
366 | } |
367 | ||
d155255a AC |
368 | /** |
369 | * pty_common_install - set up the pty pair | |
370 | * @driver: the pty driver | |
371 | * @tty: the tty being instantiated | |
2c964a2f | 372 | * @legacy: true if this is BSD style |
d155255a AC |
373 | * |
374 | * Perform the initial set up for the tty/pty pair. Called from the | |
375 | * tty layer when the port is first opened. | |
376 | * | |
377 | * Locking: the caller must hold the tty_mutex | |
378 | */ | |
5d249bc6 JS |
379 | static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty, |
380 | bool legacy) | |
bf970ee4 AC |
381 | { |
382 | struct tty_struct *o_tty; | |
d03702a2 | 383 | struct tty_port *ports[2]; |
bf970ee4 | 384 | int idx = tty->index; |
5d249bc6 | 385 | int retval = -ENOMEM; |
bf970ee4 | 386 | |
55199ea3 PH |
387 | /* Opening the slave first has always returned -EIO */ |
388 | if (driver->subtype != PTY_TYPE_MASTER) | |
389 | return -EIO; | |
390 | ||
d03702a2 JS |
391 | ports[0] = kmalloc(sizeof **ports, GFP_KERNEL); |
392 | ports[1] = kmalloc(sizeof **ports, GFP_KERNEL); | |
6f9ea7ad | 393 | if (!ports[0] || !ports[1]) |
2c964a2f | 394 | goto err; |
bf970ee4 AC |
395 | if (!try_module_get(driver->other->owner)) { |
396 | /* This cannot in fact currently happen */ | |
2c964a2f | 397 | goto err; |
bf970ee4 | 398 | } |
2c964a2f RV |
399 | o_tty = alloc_tty_struct(driver->other, idx); |
400 | if (!o_tty) | |
401 | goto err_put_module; | |
bf970ee4 | 402 | |
2febdb63 | 403 | tty_set_lock_subclass(o_tty); |
d2b6f447 | 404 | lockdep_set_subclass(&o_tty->termios_rwsem, TTY_LOCK_SLAVE); |
2febdb63 | 405 | |
5d249bc6 JS |
406 | if (legacy) { |
407 | /* We always use new tty termios data so we can do this | |
408 | the easy way .. */ | |
a3123fd0 PH |
409 | tty_init_termios(tty); |
410 | tty_init_termios(o_tty); | |
5d249bc6 JS |
411 | |
412 | driver->other->ttys[idx] = o_tty; | |
413 | driver->ttys[idx] = tty; | |
414 | } else { | |
adc8d746 AC |
415 | memset(&tty->termios_locked, 0, sizeof(tty->termios_locked)); |
416 | tty->termios = driver->init_termios; | |
417 | memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked)); | |
418 | o_tty->termios = driver->other->init_termios; | |
5d249bc6 | 419 | } |
fe9cd962 | 420 | |
bf970ee4 AC |
421 | /* |
422 | * Everything allocated ... set up the o_tty structure. | |
423 | */ | |
bf970ee4 | 424 | tty_driver_kref_get(driver->other); |
bf970ee4 AC |
425 | /* Establish the links in both directions */ |
426 | tty->link = o_tty; | |
427 | o_tty->link = tty; | |
d03702a2 JS |
428 | tty_port_init(ports[0]); |
429 | tty_port_init(ports[1]); | |
c81622ac PH |
430 | tty_buffer_set_limit(ports[0], 8192); |
431 | tty_buffer_set_limit(ports[1], 8192); | |
d03702a2 JS |
432 | o_tty->port = ports[0]; |
433 | tty->port = ports[1]; | |
967fab69 | 434 | o_tty->port->itty = o_tty; |
bf970ee4 | 435 | |
1d1d14da PH |
436 | tty_buffer_set_lock_subclass(o_tty->port); |
437 | ||
bf970ee4 AC |
438 | tty_driver_kref_get(driver); |
439 | tty->count++; | |
55199ea3 | 440 | o_tty->count++; |
bf970ee4 | 441 | return 0; |
a3123fd0 | 442 | |
2c964a2f | 443 | err_put_module: |
07584d4a | 444 | module_put(driver->other->owner); |
2c964a2f | 445 | err: |
d03702a2 JS |
446 | kfree(ports[0]); |
447 | kfree(ports[1]); | |
8a1b8d70 | 448 | return retval; |
bf970ee4 AC |
449 | } |
450 | ||
d03702a2 JS |
451 | static void pty_cleanup(struct tty_struct *tty) |
452 | { | |
81c79838 | 453 | tty_port_put(tty->port); |
d03702a2 JS |
454 | } |
455 | ||
5d249bc6 JS |
456 | /* Traditional BSD devices */ |
457 | #ifdef CONFIG_LEGACY_PTYS | |
458 | ||
459 | static int pty_install(struct tty_driver *driver, struct tty_struct *tty) | |
460 | { | |
461 | return pty_common_install(driver, tty, true); | |
462 | } | |
463 | ||
d155255a AC |
464 | static void pty_remove(struct tty_driver *driver, struct tty_struct *tty) |
465 | { | |
466 | struct tty_struct *pair = tty->link; | |
467 | driver->ttys[tty->index] = NULL; | |
468 | if (pair) | |
469 | pair->driver->ttys[pair->index] = NULL; | |
470 | } | |
471 | ||
6caa76b7 | 472 | static int pty_bsd_ioctl(struct tty_struct *tty, |
1da177e4 LT |
473 | unsigned int cmd, unsigned long arg) |
474 | { | |
475 | switch (cmd) { | |
476 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
477 | return pty_set_lock(tty, (int __user *) arg); | |
84fd7bdf CG |
478 | case TIOCGPTLCK: /* Get PT Lock status */ |
479 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
480 | case TIOCPKT: /* Set PT packet mode */ |
481 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
482 | case TIOCGPKT: /* Get PT packet mode */ |
483 | return pty_get_pktmode(tty, (int __user *)arg); | |
26df6d13 | 484 | case TIOCSIG: /* Send signal to other side of pty */ |
485 | return pty_signal(tty, (int) arg); | |
ded2f295 JS |
486 | case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */ |
487 | return -EINVAL; | |
1da177e4 LT |
488 | } |
489 | return -ENOIOCTLCMD; | |
490 | } | |
491 | ||
5f0f187f AS |
492 | static long pty_bsd_compat_ioctl(struct tty_struct *tty, |
493 | unsigned int cmd, unsigned long arg) | |
494 | { | |
495 | /* | |
496 | * PTY ioctls don't require any special translation between 32-bit and | |
497 | * 64-bit userspace, they are already compatible. | |
498 | */ | |
499 | return pty_bsd_ioctl(tty, cmd, arg); | |
500 | } | |
501 | ||
dc8c8587 | 502 | static int legacy_count = CONFIG_LEGACY_PTY_COUNT; |
7154988f PG |
503 | /* |
504 | * not really modular, but the easiest way to keep compat with existing | |
505 | * bootargs behaviour is to continue using module_param here. | |
506 | */ | |
dc8c8587 KS |
507 | module_param(legacy_count, int, 0); |
508 | ||
342a5971 LT |
509 | /* |
510 | * The master side of a pty can do TIOCSPTLCK and thus | |
511 | * has pty_bsd_ioctl. | |
512 | */ | |
513 | static const struct tty_operations master_pty_ops_bsd = { | |
514 | .install = pty_install, | |
3e8e88ca AC |
515 | .open = pty_open, |
516 | .close = pty_close, | |
517 | .write = pty_write, | |
518 | .write_room = pty_write_room, | |
519 | .flush_buffer = pty_flush_buffer, | |
520 | .chars_in_buffer = pty_chars_in_buffer, | |
521 | .unthrottle = pty_unthrottle, | |
3e8e88ca | 522 | .ioctl = pty_bsd_ioctl, |
5f0f187f | 523 | .compat_ioctl = pty_bsd_compat_ioctl, |
d03702a2 | 524 | .cleanup = pty_cleanup, |
d155255a AC |
525 | .resize = pty_resize, |
526 | .remove = pty_remove | |
3e8e88ca AC |
527 | }; |
528 | ||
342a5971 LT |
529 | static const struct tty_operations slave_pty_ops_bsd = { |
530 | .install = pty_install, | |
531 | .open = pty_open, | |
532 | .close = pty_close, | |
533 | .write = pty_write, | |
534 | .write_room = pty_write_room, | |
535 | .flush_buffer = pty_flush_buffer, | |
536 | .chars_in_buffer = pty_chars_in_buffer, | |
537 | .unthrottle = pty_unthrottle, | |
538 | .set_termios = pty_set_termios, | |
d03702a2 | 539 | .cleanup = pty_cleanup, |
d155255a | 540 | .resize = pty_resize, |
01adc807 PH |
541 | .start = pty_start, |
542 | .stop = pty_stop, | |
d155255a | 543 | .remove = pty_remove |
342a5971 LT |
544 | }; |
545 | ||
1da177e4 LT |
546 | static void __init legacy_pty_init(void) |
547 | { | |
342a5971 LT |
548 | struct tty_driver *pty_driver, *pty_slave_driver; |
549 | ||
dc8c8587 KS |
550 | if (legacy_count <= 0) |
551 | return; | |
1da177e4 | 552 | |
21aca2fa JS |
553 | pty_driver = tty_alloc_driver(legacy_count, |
554 | TTY_DRIVER_RESET_TERMIOS | | |
555 | TTY_DRIVER_REAL_RAW | | |
556 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 557 | if (IS_ERR(pty_driver)) |
1da177e4 LT |
558 | panic("Couldn't allocate pty driver"); |
559 | ||
21aca2fa JS |
560 | pty_slave_driver = tty_alloc_driver(legacy_count, |
561 | TTY_DRIVER_RESET_TERMIOS | | |
562 | TTY_DRIVER_REAL_RAW | | |
563 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 564 | if (IS_ERR(pty_slave_driver)) |
1da177e4 LT |
565 | panic("Couldn't allocate pty slave driver"); |
566 | ||
1da177e4 LT |
567 | pty_driver->driver_name = "pty_master"; |
568 | pty_driver->name = "pty"; | |
1da177e4 LT |
569 | pty_driver->major = PTY_MASTER_MAJOR; |
570 | pty_driver->minor_start = 0; | |
571 | pty_driver->type = TTY_DRIVER_TYPE_PTY; | |
572 | pty_driver->subtype = PTY_TYPE_MASTER; | |
573 | pty_driver->init_termios = tty_std_termios; | |
574 | pty_driver->init_termios.c_iflag = 0; | |
575 | pty_driver->init_termios.c_oflag = 0; | |
576 | pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
577 | pty_driver->init_termios.c_lflag = 0; | |
606d099c AC |
578 | pty_driver->init_termios.c_ispeed = 38400; |
579 | pty_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 580 | pty_driver->other = pty_slave_driver; |
342a5971 | 581 | tty_set_operations(pty_driver, &master_pty_ops_bsd); |
1da177e4 | 582 | |
1da177e4 LT |
583 | pty_slave_driver->driver_name = "pty_slave"; |
584 | pty_slave_driver->name = "ttyp"; | |
1da177e4 LT |
585 | pty_slave_driver->major = PTY_SLAVE_MAJOR; |
586 | pty_slave_driver->minor_start = 0; | |
587 | pty_slave_driver->type = TTY_DRIVER_TYPE_PTY; | |
588 | pty_slave_driver->subtype = PTY_TYPE_SLAVE; | |
589 | pty_slave_driver->init_termios = tty_std_termios; | |
590 | pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
591 | pty_slave_driver->init_termios.c_ispeed = 38400; |
592 | pty_slave_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 593 | pty_slave_driver->other = pty_driver; |
342a5971 | 594 | tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd); |
1da177e4 LT |
595 | |
596 | if (tty_register_driver(pty_driver)) | |
597 | panic("Couldn't register pty driver"); | |
598 | if (tty_register_driver(pty_slave_driver)) | |
599 | panic("Couldn't register pty slave driver"); | |
600 | } | |
601 | #else | |
602 | static inline void legacy_pty_init(void) { } | |
603 | #endif | |
604 | ||
605 | /* Unix98 devices */ | |
606 | #ifdef CONFIG_UNIX98_PTYS | |
d81ed103 AC |
607 | static struct cdev ptmx_cdev; |
608 | ||
6509f309 AB |
609 | /** |
610 | * pty_open_peer - open the peer of a pty | |
611 | * @tty: the peer of the pty being opened | |
612 | * | |
613 | * Open the cached dentry in tty->link, providing a safe way for userspace | |
614 | * to get the slave end of a pty (where they have the master fd and cannot | |
615 | * access or trust the mount namespace /dev/pts was mounted inside). | |
616 | */ | |
617 | static struct file *pty_open_peer(struct tty_struct *tty, int flags) | |
618 | { | |
619 | if (tty->driver->subtype != PTY_TYPE_MASTER) | |
620 | return ERR_PTR(-EIO); | |
621 | return dentry_open(tty->link->driver_data, flags, current_cred()); | |
622 | } | |
623 | ||
624 | static int pty_get_peer(struct tty_struct *tty, int flags) | |
625 | { | |
626 | int fd = -1; | |
627 | struct file *filp = NULL; | |
628 | int retval = -EINVAL; | |
629 | ||
630 | fd = get_unused_fd_flags(0); | |
631 | if (fd < 0) { | |
632 | retval = fd; | |
633 | goto err; | |
634 | } | |
635 | ||
636 | filp = pty_open_peer(tty, flags); | |
637 | if (IS_ERR(filp)) { | |
638 | retval = PTR_ERR(filp); | |
639 | goto err_put; | |
640 | } | |
641 | ||
642 | fd_install(fd, filp); | |
643 | return fd; | |
644 | ||
645 | err_put: | |
646 | put_unused_fd(fd); | |
647 | err: | |
648 | return retval; | |
649 | } | |
650 | ||
6caa76b7 | 651 | static int pty_unix98_ioctl(struct tty_struct *tty, |
1da177e4 LT |
652 | unsigned int cmd, unsigned long arg) |
653 | { | |
654 | switch (cmd) { | |
655 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
656 | return pty_set_lock(tty, (int __user *)arg); | |
84fd7bdf CG |
657 | case TIOCGPTLCK: /* Get PT Lock status */ |
658 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
659 | case TIOCPKT: /* Set PT packet mode */ |
660 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
661 | case TIOCGPKT: /* Get PT packet mode */ |
662 | return pty_get_pktmode(tty, (int __user *)arg); | |
1da177e4 LT |
663 | case TIOCGPTN: /* Get PT Number */ |
664 | return put_user(tty->index, (unsigned int __user *)arg); | |
54ebbfb1 AS |
665 | case TIOCGPTPEER: /* Open the other end */ |
666 | return pty_get_peer(tty, (int) arg); | |
26df6d13 | 667 | case TIOCSIG: /* Send signal to other side of pty */ |
668 | return pty_signal(tty, (int) arg); | |
1da177e4 LT |
669 | } |
670 | ||
671 | return -ENOIOCTLCMD; | |
672 | } | |
673 | ||
5f0f187f AS |
674 | static long pty_unix98_compat_ioctl(struct tty_struct *tty, |
675 | unsigned int cmd, unsigned long arg) | |
676 | { | |
677 | /* | |
678 | * PTY ioctls don't require any special translation between 32-bit and | |
679 | * 64-bit userspace, they are already compatible. | |
680 | */ | |
681 | return pty_unix98_ioctl(tty, cmd, arg); | |
682 | } | |
683 | ||
99f1fe18 AC |
684 | /** |
685 | * ptm_unix98_lookup - find a pty master | |
686 | * @driver: ptm driver | |
687 | * @idx: tty index | |
688 | * | |
689 | * Look up a pty master device. Called under the tty_mutex for now. | |
690 | * This provides our locking. | |
691 | */ | |
692 | ||
15f1a633 | 693 | static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, |
8ead9dd5 | 694 | struct file *file, int idx) |
99f1fe18 | 695 | { |
593a27c4 KK |
696 | /* Master must be open via /dev/ptmx */ |
697 | return ERR_PTR(-EIO); | |
99f1fe18 AC |
698 | } |
699 | ||
700 | /** | |
701 | * pts_unix98_lookup - find a pty slave | |
702 | * @driver: pts driver | |
703 | * @idx: tty index | |
704 | * | |
705 | * Look up a pty master device. Called under the tty_mutex for now. | |
d739e65b | 706 | * This provides our locking for the tty pointer. |
99f1fe18 AC |
707 | */ |
708 | ||
15f1a633 | 709 | static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver, |
8ead9dd5 | 710 | struct file *file, int idx) |
99f1fe18 | 711 | { |
d739e65b AC |
712 | struct tty_struct *tty; |
713 | ||
714 | mutex_lock(&devpts_mutex); | |
8ead9dd5 | 715 | tty = devpts_get_priv(file->f_path.dentry); |
d739e65b | 716 | mutex_unlock(&devpts_mutex); |
99f1fe18 AC |
717 | /* Master must be open before slave */ |
718 | if (!tty) | |
719 | return ERR_PTR(-EIO); | |
720 | return tty; | |
721 | } | |
722 | ||
bf970ee4 | 723 | static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty) |
8b0a88d5 | 724 | { |
5d249bc6 | 725 | return pty_common_install(driver, tty, false); |
8b0a88d5 AC |
726 | } |
727 | ||
f4b208eb | 728 | /* this is called once with whichever end is closed last */ |
c1e33af1 | 729 | static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty) |
f4b208eb | 730 | { |
67245ff3 | 731 | struct pts_fs_info *fsi; |
2831c89f HK |
732 | |
733 | if (tty->driver->subtype == PTY_TYPE_MASTER) | |
67245ff3 | 734 | fsi = tty->driver_data; |
2831c89f | 735 | else |
67245ff3 | 736 | fsi = tty->link->driver_data; |
5353ed8d CIK |
737 | |
738 | if (fsi) { | |
739 | devpts_kill_index(fsi, tty->index); | |
740 | devpts_release(fsi); | |
741 | } | |
f4b208eb JS |
742 | } |
743 | ||
feebed65 | 744 | static const struct tty_operations ptm_unix98_ops = { |
99f1fe18 | 745 | .lookup = ptm_unix98_lookup, |
bf970ee4 | 746 | .install = pty_unix98_install, |
7171604a | 747 | .remove = pty_unix98_remove, |
3e8e88ca AC |
748 | .open = pty_open, |
749 | .close = pty_close, | |
750 | .write = pty_write, | |
751 | .write_room = pty_write_room, | |
752 | .flush_buffer = pty_flush_buffer, | |
753 | .chars_in_buffer = pty_chars_in_buffer, | |
754 | .unthrottle = pty_unthrottle, | |
feebed65 | 755 | .ioctl = pty_unix98_ioctl, |
5f0f187f | 756 | .compat_ioctl = pty_unix98_compat_ioctl, |
36b3c070 AC |
757 | .resize = pty_resize, |
758 | .cleanup = pty_cleanup | |
3e8e88ca AC |
759 | }; |
760 | ||
99f1fe18 AC |
761 | static const struct tty_operations pty_unix98_ops = { |
762 | .lookup = pts_unix98_lookup, | |
bf970ee4 | 763 | .install = pty_unix98_install, |
7171604a | 764 | .remove = pty_unix98_remove, |
99f1fe18 AC |
765 | .open = pty_open, |
766 | .close = pty_close, | |
767 | .write = pty_write, | |
768 | .write_room = pty_write_room, | |
769 | .flush_buffer = pty_flush_buffer, | |
770 | .chars_in_buffer = pty_chars_in_buffer, | |
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; |
54ebbfb1 | 794 | struct path *pts_path; |
8ead9dd5 | 795 | struct dentry *dentry; |
c8c03f18 | 796 | struct vfsmount *mnt; |
d81ed103 AC |
797 | int retval; |
798 | int index; | |
799 | ||
800 | nonseekable_open(inode, filp); | |
801 | ||
b0b88565 LT |
802 | /* We refuse fsnotify events on ptmx, since it's a shared resource */ |
803 | filp->f_mode |= FMODE_NONOTIFY; | |
804 | ||
fa90e1c9 JS |
805 | retval = tty_alloc_file(filp); |
806 | if (retval) | |
807 | return retval; | |
808 | ||
c8c03f18 | 809 | fsi = devpts_acquire(filp, &mnt); |
eedf265a EB |
810 | if (IS_ERR(fsi)) { |
811 | retval = PTR_ERR(fsi); | |
67245ff3 | 812 | goto out_free_file; |
eedf265a | 813 | } |
67245ff3 | 814 | |
d81ed103 | 815 | /* find a device that is not in use. */ |
89c8d91e | 816 | mutex_lock(&devpts_mutex); |
67245ff3 | 817 | index = devpts_new_index(fsi); |
89c8d91e AC |
818 | mutex_unlock(&devpts_mutex); |
819 | ||
67245ff3 LT |
820 | retval = index; |
821 | if (index < 0) | |
eedf265a | 822 | goto out_put_fsi; |
d81ed103 | 823 | |
d81ed103 | 824 | |
67245ff3 LT |
825 | mutex_lock(&tty_mutex); |
826 | tty = tty_init_dev(ptm_driver, index); | |
89c8d91e AC |
827 | /* The tty returned here is locked so we can safely |
828 | drop the mutex */ | |
829 | mutex_unlock(&tty_mutex); | |
830 | ||
67245ff3 LT |
831 | retval = PTR_ERR(tty); |
832 | if (IS_ERR(tty)) | |
833 | goto out; | |
ee2ffa0d | 834 | |
2831c89f | 835 | /* |
67245ff3 LT |
836 | * From here on out, the tty is "live", and the index and |
837 | * fsi will be killed/put by the tty_release() | |
2831c89f | 838 | */ |
67245ff3 LT |
839 | set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ |
840 | tty->driver_data = fsi; | |
2831c89f | 841 | |
fa90e1c9 | 842 | tty_add_file(tty, filp); |
d81ed103 | 843 | |
8ead9dd5 LT |
844 | dentry = devpts_pty_new(fsi, index, tty->link); |
845 | if (IS_ERR(dentry)) { | |
846 | retval = PTR_ERR(dentry); | |
1177c0ef | 847 | goto err_release; |
162b97cf | 848 | } |
54ebbfb1 AS |
849 | /* We need to cache a fake path for TIOCGPTPEER. */ |
850 | pts_path = kmalloc(sizeof(struct path), GFP_KERNEL); | |
851 | if (!pts_path) | |
852 | goto err_release; | |
c8c03f18 | 853 | pts_path->mnt = mnt; |
54ebbfb1 AS |
854 | pts_path->dentry = dentry; |
855 | path_get(pts_path); | |
856 | tty->link->driver_data = pts_path; | |
d81ed103 AC |
857 | |
858 | retval = ptm_driver->ops->open(tty, filp); | |
64ba3dc3 | 859 | if (retval) |
54ebbfb1 | 860 | goto err_path_put; |
1177c0ef | 861 | |
d435cefe | 862 | tty_debug_hangup(tty, "opening (count=%d)\n", tty->count); |
d6847793 | 863 | |
89c8d91e | 864 | tty_unlock(tty); |
1177c0ef | 865 | return 0; |
54ebbfb1 AS |
866 | err_path_put: |
867 | path_put(pts_path); | |
868 | kfree(pts_path); | |
1177c0ef | 869 | err_release: |
c8c03f18 | 870 | mntput(mnt); |
89c8d91e | 871 | tty_unlock(tty); |
67245ff3 | 872 | // This will also put-ref the fsi |
eeb89d91 | 873 | tty_release(inode, filp); |
d81ed103 AC |
874 | return retval; |
875 | out: | |
67245ff3 | 876 | devpts_kill_index(fsi, index); |
eedf265a EB |
877 | out_put_fsi: |
878 | devpts_release(fsi); | |
c8c03f18 | 879 | mntput(mnt); |
67245ff3 | 880 | out_free_file: |
fa90e1c9 | 881 | tty_free_file(filp); |
64ba3dc3 | 882 | return retval; |
d81ed103 AC |
883 | } |
884 | ||
d2ec3f77 | 885 | static struct file_operations ptmx_fops __ro_after_init; |
d81ed103 | 886 | |
1da177e4 LT |
887 | static void __init unix98_pty_init(void) |
888 | { | |
21aca2fa JS |
889 | ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
890 | TTY_DRIVER_RESET_TERMIOS | | |
891 | TTY_DRIVER_REAL_RAW | | |
892 | TTY_DRIVER_DYNAMIC_DEV | | |
893 | TTY_DRIVER_DEVPTS_MEM | | |
894 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 895 | if (IS_ERR(ptm_driver)) |
1da177e4 | 896 | panic("Couldn't allocate Unix98 ptm driver"); |
21aca2fa JS |
897 | pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
898 | TTY_DRIVER_RESET_TERMIOS | | |
899 | TTY_DRIVER_REAL_RAW | | |
900 | TTY_DRIVER_DYNAMIC_DEV | | |
901 | TTY_DRIVER_DEVPTS_MEM | | |
902 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 903 | if (IS_ERR(pts_driver)) |
1da177e4 LT |
904 | panic("Couldn't allocate Unix98 pts driver"); |
905 | ||
1da177e4 LT |
906 | ptm_driver->driver_name = "pty_master"; |
907 | ptm_driver->name = "ptm"; | |
908 | ptm_driver->major = UNIX98_PTY_MASTER_MAJOR; | |
909 | ptm_driver->minor_start = 0; | |
910 | ptm_driver->type = TTY_DRIVER_TYPE_PTY; | |
911 | ptm_driver->subtype = PTY_TYPE_MASTER; | |
912 | ptm_driver->init_termios = tty_std_termios; | |
913 | ptm_driver->init_termios.c_iflag = 0; | |
914 | ptm_driver->init_termios.c_oflag = 0; | |
915 | ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
916 | ptm_driver->init_termios.c_lflag = 0; | |
606d099c AC |
917 | ptm_driver->init_termios.c_ispeed = 38400; |
918 | ptm_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 919 | ptm_driver->other = pts_driver; |
feebed65 | 920 | tty_set_operations(ptm_driver, &ptm_unix98_ops); |
1da177e4 | 921 | |
1da177e4 LT |
922 | pts_driver->driver_name = "pty_slave"; |
923 | pts_driver->name = "pts"; | |
924 | pts_driver->major = UNIX98_PTY_SLAVE_MAJOR; | |
925 | pts_driver->minor_start = 0; | |
926 | pts_driver->type = TTY_DRIVER_TYPE_PTY; | |
927 | pts_driver->subtype = PTY_TYPE_SLAVE; | |
928 | pts_driver->init_termios = tty_std_termios; | |
929 | pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
930 | pts_driver->init_termios.c_ispeed = 38400; |
931 | pts_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 932 | pts_driver->other = ptm_driver; |
99f1fe18 | 933 | tty_set_operations(pts_driver, &pty_unix98_ops); |
fe9cd962 | 934 | |
1da177e4 LT |
935 | if (tty_register_driver(ptm_driver)) |
936 | panic("Couldn't register Unix98 ptm driver"); | |
937 | if (tty_register_driver(pts_driver)) | |
938 | panic("Couldn't register Unix98 pts driver"); | |
939 | ||
d81ed103 AC |
940 | /* Now create the /dev/ptmx special device */ |
941 | tty_default_fops(&ptmx_fops); | |
942 | ptmx_fops.open = ptmx_open; | |
943 | ||
944 | cdev_init(&ptmx_cdev, &ptmx_fops); | |
945 | if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) || | |
946 | register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0) | |
82f8c35f | 947 | panic("Couldn't register /dev/ptmx driver"); |
d81ed103 | 948 | device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); |
1da177e4 | 949 | } |
d81ed103 | 950 | |
1da177e4 LT |
951 | #else |
952 | static inline void unix98_pty_init(void) { } | |
953 | #endif | |
954 | ||
955 | static int __init pty_init(void) | |
956 | { | |
957 | legacy_pty_init(); | |
958 | unix98_pty_init(); | |
959 | return 0; | |
960 | } | |
7154988f | 961 | device_initcall(pty_init); |