Commit | Line | Data |
---|---|---|
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; | |
1da177e4 | 113 | |
d945cb9c | 114 | if (tty->stopped) |
1da177e4 | 115 | return 0; |
d945cb9c | 116 | |
d945cb9c AC |
117 | if (c > 0) { |
118 | /* Stuff the data into the input queue of the other end */ | |
05c7cd39 | 119 | c = tty_insert_flip_string(to->port, buf, c); |
d945cb9c | 120 | /* And shovel */ |
5ede5253 | 121 | if (c) |
2e124b4a | 122 | tty_flip_buffer_push(to->port); |
762faaed | 123 | } |
1da177e4 LT |
124 | return c; |
125 | } | |
126 | ||
d945cb9c AC |
127 | /** |
128 | * pty_write_room - write space | |
129 | * @tty: tty we are writing from | |
130 | * | |
131 | * Report how many bytes the ldisc can send into the queue for | |
132 | * the other device. | |
133 | */ | |
134 | ||
1da177e4 LT |
135 | static int pty_write_room(struct tty_struct *tty) |
136 | { | |
85dfd81d LT |
137 | if (tty->stopped) |
138 | return 0; | |
c81622ac | 139 | return tty_buffer_space_avail(tty->link->port); |
1da177e4 LT |
140 | } |
141 | ||
d945cb9c AC |
142 | /** |
143 | * pty_chars_in_buffer - characters currently in our tx queue | |
144 | * @tty: our tty | |
fe9cd962 | 145 | * |
d945cb9c AC |
146 | * Report how much we have in the transmit queue. As everything is |
147 | * instantly at the other end this is easy to implement. | |
1da177e4 | 148 | */ |
d945cb9c | 149 | |
1da177e4 LT |
150 | static int pty_chars_in_buffer(struct tty_struct *tty) |
151 | { | |
d945cb9c | 152 | return 0; |
1da177e4 LT |
153 | } |
154 | ||
155 | /* Set the lock flag on a pty */ | |
fe9cd962 | 156 | static int pty_set_lock(struct tty_struct *tty, int __user *arg) |
1da177e4 LT |
157 | { |
158 | int val; | |
fe9cd962 | 159 | if (get_user(val, arg)) |
1da177e4 LT |
160 | return -EFAULT; |
161 | if (val) | |
162 | set_bit(TTY_PTY_LOCK, &tty->flags); | |
163 | else | |
164 | clear_bit(TTY_PTY_LOCK, &tty->flags); | |
165 | return 0; | |
166 | } | |
167 | ||
84fd7bdf CG |
168 | static int pty_get_lock(struct tty_struct *tty, int __user *arg) |
169 | { | |
170 | int locked = test_bit(TTY_PTY_LOCK, &tty->flags); | |
171 | return put_user(locked, arg); | |
172 | } | |
173 | ||
06026d91 CG |
174 | /* Set the packet mode on a pty */ |
175 | static int pty_set_pktmode(struct tty_struct *tty, int __user *arg) | |
176 | { | |
06026d91 CG |
177 | int pktmode; |
178 | ||
179 | if (get_user(pktmode, arg)) | |
180 | return -EFAULT; | |
181 | ||
6054c16e | 182 | spin_lock_irq(&tty->ctrl_lock); |
06026d91 CG |
183 | if (pktmode) { |
184 | if (!tty->packet) { | |
06026d91 | 185 | tty->link->ctrl_status = 0; |
2622d73e PH |
186 | smp_mb(); |
187 | tty->packet = 1; | |
06026d91 CG |
188 | } |
189 | } else | |
190 | tty->packet = 0; | |
6054c16e | 191 | spin_unlock_irq(&tty->ctrl_lock); |
06026d91 CG |
192 | |
193 | return 0; | |
194 | } | |
195 | ||
84fd7bdf CG |
196 | /* Get the packet mode of a pty */ |
197 | static int pty_get_pktmode(struct tty_struct *tty, int __user *arg) | |
198 | { | |
199 | int pktmode = tty->packet; | |
200 | return put_user(pktmode, arg); | |
201 | } | |
202 | ||
26df6d13 | 203 | /* Send a signal to the slave */ |
204 | static int pty_signal(struct tty_struct *tty, int sig) | |
205 | { | |
26df6d13 | 206 | struct pid *pgrp; |
207 | ||
37480a05 PH |
208 | if (sig != SIGINT && sig != SIGQUIT && sig != SIGTSTP) |
209 | return -EINVAL; | |
210 | ||
26df6d13 | 211 | if (tty->link) { |
5b239542 PH |
212 | pgrp = tty_get_pgrp(tty->link); |
213 | if (pgrp) | |
214 | kill_pgrp(pgrp, sig, 1); | |
26df6d13 | 215 | put_pid(pgrp); |
216 | } | |
217 | return 0; | |
218 | } | |
219 | ||
1da177e4 LT |
220 | static void pty_flush_buffer(struct tty_struct *tty) |
221 | { | |
222 | struct tty_struct *to = tty->link; | |
fe9cd962 | 223 | |
1da177e4 LT |
224 | if (!to) |
225 | return; | |
1d1d14da | 226 | |
77dae613 | 227 | tty_buffer_flush(to, NULL); |
1da177e4 | 228 | if (to->packet) { |
6054c16e | 229 | spin_lock_irq(&tty->ctrl_lock); |
1da177e4 LT |
230 | tty->ctrl_status |= TIOCPKT_FLUSHWRITE; |
231 | wake_up_interruptible(&to->read_wait); | |
6054c16e | 232 | spin_unlock_irq(&tty->ctrl_lock); |
1da177e4 LT |
233 | } |
234 | } | |
235 | ||
fe9cd962 | 236 | static int pty_open(struct tty_struct *tty, struct file *filp) |
1da177e4 | 237 | { |
1da177e4 | 238 | if (!tty || !tty->link) |
7c61c3d8 | 239 | return -ENODEV; |
69939035 | 240 | |
1da177e4 LT |
241 | if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) |
242 | goto out; | |
243 | if (test_bit(TTY_PTY_LOCK, &tty->link->flags)) | |
244 | goto out; | |
80cace72 | 245 | if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1) |
1da177e4 LT |
246 | goto out; |
247 | ||
69939035 | 248 | clear_bit(TTY_IO_ERROR, &tty->flags); |
1da177e4 LT |
249 | clear_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
250 | set_bit(TTY_THROTTLED, &tty->flags); | |
7c61c3d8 PH |
251 | return 0; |
252 | ||
1da177e4 | 253 | out: |
7c61c3d8 PH |
254 | set_bit(TTY_IO_ERROR, &tty->flags); |
255 | return -EIO; | |
1da177e4 LT |
256 | } |
257 | ||
fe9cd962 AC |
258 | static void pty_set_termios(struct tty_struct *tty, |
259 | struct ktermios *old_termios) | |
1da177e4 | 260 | { |
dbfcd851 PH |
261 | /* See if packet mode change of state. */ |
262 | if (tty->link && tty->link->packet) { | |
9db276f8 | 263 | int extproc = (old_termios->c_lflag & EXTPROC) | L_EXTPROC(tty); |
dbfcd851 PH |
264 | int old_flow = ((old_termios->c_iflag & IXON) && |
265 | (old_termios->c_cc[VSTOP] == '\023') && | |
266 | (old_termios->c_cc[VSTART] == '\021')); | |
267 | int new_flow = (I_IXON(tty) && | |
268 | STOP_CHAR(tty) == '\023' && | |
269 | START_CHAR(tty) == '\021'); | |
270 | if ((old_flow != new_flow) || extproc) { | |
4d8c1dff | 271 | spin_lock_irq(&tty->ctrl_lock); |
dbfcd851 PH |
272 | if (old_flow != new_flow) { |
273 | tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); | |
274 | if (new_flow) | |
275 | tty->ctrl_status |= TIOCPKT_DOSTOP; | |
276 | else | |
277 | tty->ctrl_status |= TIOCPKT_NOSTOP; | |
278 | } | |
279 | if (extproc) | |
280 | tty->ctrl_status |= TIOCPKT_IOCTL; | |
4d8c1dff | 281 | spin_unlock_irq(&tty->ctrl_lock); |
dbfcd851 PH |
282 | wake_up_interruptible(&tty->link->read_wait); |
283 | } | |
284 | } | |
285 | ||
adc8d746 AC |
286 | tty->termios.c_cflag &= ~(CSIZE | PARENB); |
287 | tty->termios.c_cflag |= (CS8 | CREAD); | |
1da177e4 LT |
288 | } |
289 | ||
fc6f6238 AC |
290 | /** |
291 | * pty_do_resize - resize event | |
292 | * @tty: tty being resized | |
c774bda2 | 293 | * @ws: window size being set. |
fc6f6238 | 294 | * |
3ad2f3fb | 295 | * Update the termios variables and send the necessary signals to |
fc6f6238 AC |
296 | * peform a terminal resize correctly |
297 | */ | |
298 | ||
159a8e92 | 299 | static int pty_resize(struct tty_struct *tty, struct winsize *ws) |
fc6f6238 AC |
300 | { |
301 | struct pid *pgrp, *rpgrp; | |
fc6f6238 AC |
302 | struct tty_struct *pty = tty->link; |
303 | ||
304 | /* For a PTY we need to lock the tty side */ | |
dee4a0be | 305 | mutex_lock(&tty->winsize_mutex); |
fc6f6238 AC |
306 | if (!memcmp(ws, &tty->winsize, sizeof(*ws))) |
307 | goto done; | |
308 | ||
5b239542 PH |
309 | /* Signal the foreground process group of both ptys */ |
310 | pgrp = tty_get_pgrp(tty); | |
311 | rpgrp = tty_get_pgrp(pty); | |
fc6f6238 AC |
312 | |
313 | if (pgrp) | |
314 | kill_pgrp(pgrp, SIGWINCH, 1); | |
315 | if (rpgrp != pgrp && rpgrp) | |
316 | kill_pgrp(rpgrp, SIGWINCH, 1); | |
317 | ||
318 | put_pid(pgrp); | |
319 | put_pid(rpgrp); | |
320 | ||
321 | tty->winsize = *ws; | |
322 | pty->winsize = *ws; /* Never used so will go away soon */ | |
323 | done: | |
dee4a0be | 324 | mutex_unlock(&tty->winsize_mutex); |
fc6f6238 AC |
325 | return 0; |
326 | } | |
327 | ||
01adc807 PH |
328 | /** |
329 | * pty_start - start() handler | |
330 | * pty_stop - stop() handler | |
331 | * @tty: tty being flow-controlled | |
332 | * | |
333 | * Propagates the TIOCPKT status to the master pty. | |
334 | * | |
335 | * NB: only the master pty can be in packet mode so only the slave | |
336 | * needs start()/stop() handlers | |
337 | */ | |
338 | static void pty_start(struct tty_struct *tty) | |
339 | { | |
340 | unsigned long flags; | |
341 | ||
01adc807 | 342 | if (tty->link && tty->link->packet) { |
54e8e5fc | 343 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
01adc807 PH |
344 | tty->ctrl_status &= ~TIOCPKT_STOP; |
345 | tty->ctrl_status |= TIOCPKT_START; | |
54e8e5fc | 346 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
01adc807 PH |
347 | wake_up_interruptible_poll(&tty->link->read_wait, POLLIN); |
348 | } | |
01adc807 PH |
349 | } |
350 | ||
351 | static void pty_stop(struct tty_struct *tty) | |
352 | { | |
353 | unsigned long flags; | |
354 | ||
01adc807 | 355 | if (tty->link && tty->link->packet) { |
54e8e5fc | 356 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
01adc807 PH |
357 | tty->ctrl_status &= ~TIOCPKT_START; |
358 | tty->ctrl_status |= TIOCPKT_STOP; | |
54e8e5fc | 359 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
01adc807 PH |
360 | wake_up_interruptible_poll(&tty->link->read_wait, POLLIN); |
361 | } | |
01adc807 PH |
362 | } |
363 | ||
d155255a AC |
364 | /** |
365 | * pty_common_install - set up the pty pair | |
366 | * @driver: the pty driver | |
367 | * @tty: the tty being instantiated | |
2c964a2f | 368 | * @legacy: true if this is BSD style |
d155255a AC |
369 | * |
370 | * Perform the initial set up for the tty/pty pair. Called from the | |
371 | * tty layer when the port is first opened. | |
372 | * | |
373 | * Locking: the caller must hold the tty_mutex | |
374 | */ | |
5d249bc6 JS |
375 | static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty, |
376 | bool legacy) | |
bf970ee4 AC |
377 | { |
378 | struct tty_struct *o_tty; | |
d03702a2 | 379 | struct tty_port *ports[2]; |
bf970ee4 | 380 | int idx = tty->index; |
5d249bc6 | 381 | int retval = -ENOMEM; |
bf970ee4 | 382 | |
55199ea3 PH |
383 | /* Opening the slave first has always returned -EIO */ |
384 | if (driver->subtype != PTY_TYPE_MASTER) | |
385 | return -EIO; | |
386 | ||
d03702a2 JS |
387 | ports[0] = kmalloc(sizeof **ports, GFP_KERNEL); |
388 | ports[1] = kmalloc(sizeof **ports, GFP_KERNEL); | |
6f9ea7ad | 389 | if (!ports[0] || !ports[1]) |
2c964a2f | 390 | goto err; |
bf970ee4 AC |
391 | if (!try_module_get(driver->other->owner)) { |
392 | /* This cannot in fact currently happen */ | |
2c964a2f | 393 | goto err; |
bf970ee4 | 394 | } |
2c964a2f RV |
395 | o_tty = alloc_tty_struct(driver->other, idx); |
396 | if (!o_tty) | |
397 | goto err_put_module; | |
bf970ee4 | 398 | |
2febdb63 | 399 | tty_set_lock_subclass(o_tty); |
d2b6f447 | 400 | lockdep_set_subclass(&o_tty->termios_rwsem, TTY_LOCK_SLAVE); |
2febdb63 | 401 | |
5d249bc6 JS |
402 | if (legacy) { |
403 | /* We always use new tty termios data so we can do this | |
404 | the easy way .. */ | |
a3123fd0 PH |
405 | tty_init_termios(tty); |
406 | tty_init_termios(o_tty); | |
5d249bc6 JS |
407 | |
408 | driver->other->ttys[idx] = o_tty; | |
409 | driver->ttys[idx] = tty; | |
410 | } else { | |
adc8d746 AC |
411 | memset(&tty->termios_locked, 0, sizeof(tty->termios_locked)); |
412 | tty->termios = driver->init_termios; | |
413 | memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked)); | |
414 | o_tty->termios = driver->other->init_termios; | |
5d249bc6 | 415 | } |
fe9cd962 | 416 | |
bf970ee4 AC |
417 | /* |
418 | * Everything allocated ... set up the o_tty structure. | |
419 | */ | |
bf970ee4 | 420 | tty_driver_kref_get(driver->other); |
bf970ee4 AC |
421 | /* Establish the links in both directions */ |
422 | tty->link = o_tty; | |
423 | o_tty->link = tty; | |
d03702a2 JS |
424 | tty_port_init(ports[0]); |
425 | tty_port_init(ports[1]); | |
c81622ac PH |
426 | tty_buffer_set_limit(ports[0], 8192); |
427 | tty_buffer_set_limit(ports[1], 8192); | |
d03702a2 JS |
428 | o_tty->port = ports[0]; |
429 | tty->port = ports[1]; | |
967fab69 | 430 | o_tty->port->itty = o_tty; |
bf970ee4 | 431 | |
1d1d14da PH |
432 | tty_buffer_set_lock_subclass(o_tty->port); |
433 | ||
bf970ee4 AC |
434 | tty_driver_kref_get(driver); |
435 | tty->count++; | |
55199ea3 | 436 | o_tty->count++; |
bf970ee4 | 437 | return 0; |
a3123fd0 | 438 | |
2c964a2f | 439 | err_put_module: |
07584d4a | 440 | module_put(driver->other->owner); |
2c964a2f | 441 | err: |
d03702a2 JS |
442 | kfree(ports[0]); |
443 | kfree(ports[1]); | |
8a1b8d70 | 444 | return retval; |
bf970ee4 AC |
445 | } |
446 | ||
d03702a2 JS |
447 | static void pty_cleanup(struct tty_struct *tty) |
448 | { | |
81c79838 | 449 | tty_port_put(tty->port); |
d03702a2 JS |
450 | } |
451 | ||
5d249bc6 JS |
452 | /* Traditional BSD devices */ |
453 | #ifdef CONFIG_LEGACY_PTYS | |
454 | ||
455 | static int pty_install(struct tty_driver *driver, struct tty_struct *tty) | |
456 | { | |
457 | return pty_common_install(driver, tty, true); | |
458 | } | |
459 | ||
d155255a AC |
460 | static void pty_remove(struct tty_driver *driver, struct tty_struct *tty) |
461 | { | |
462 | struct tty_struct *pair = tty->link; | |
463 | driver->ttys[tty->index] = NULL; | |
464 | if (pair) | |
465 | pair->driver->ttys[pair->index] = NULL; | |
466 | } | |
467 | ||
6caa76b7 | 468 | static int pty_bsd_ioctl(struct tty_struct *tty, |
1da177e4 LT |
469 | unsigned int cmd, unsigned long arg) |
470 | { | |
471 | switch (cmd) { | |
472 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
473 | return pty_set_lock(tty, (int __user *) arg); | |
84fd7bdf CG |
474 | case TIOCGPTLCK: /* Get PT Lock status */ |
475 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
476 | case TIOCPKT: /* Set PT packet mode */ |
477 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
478 | case TIOCGPKT: /* Get PT packet mode */ |
479 | return pty_get_pktmode(tty, (int __user *)arg); | |
26df6d13 | 480 | case TIOCSIG: /* Send signal to other side of pty */ |
481 | return pty_signal(tty, (int) arg); | |
ded2f295 JS |
482 | case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */ |
483 | return -EINVAL; | |
1da177e4 LT |
484 | } |
485 | return -ENOIOCTLCMD; | |
486 | } | |
487 | ||
5f0f187f AS |
488 | static long pty_bsd_compat_ioctl(struct tty_struct *tty, |
489 | unsigned int cmd, unsigned long arg) | |
490 | { | |
491 | /* | |
492 | * PTY ioctls don't require any special translation between 32-bit and | |
493 | * 64-bit userspace, they are already compatible. | |
494 | */ | |
495 | return pty_bsd_ioctl(tty, cmd, arg); | |
496 | } | |
497 | ||
dc8c8587 | 498 | static int legacy_count = CONFIG_LEGACY_PTY_COUNT; |
7154988f PG |
499 | /* |
500 | * not really modular, but the easiest way to keep compat with existing | |
501 | * bootargs behaviour is to continue using module_param here. | |
502 | */ | |
dc8c8587 KS |
503 | module_param(legacy_count, int, 0); |
504 | ||
342a5971 LT |
505 | /* |
506 | * The master side of a pty can do TIOCSPTLCK and thus | |
507 | * has pty_bsd_ioctl. | |
508 | */ | |
509 | static const struct tty_operations master_pty_ops_bsd = { | |
510 | .install = pty_install, | |
3e8e88ca AC |
511 | .open = pty_open, |
512 | .close = pty_close, | |
513 | .write = pty_write, | |
514 | .write_room = pty_write_room, | |
515 | .flush_buffer = pty_flush_buffer, | |
516 | .chars_in_buffer = pty_chars_in_buffer, | |
517 | .unthrottle = pty_unthrottle, | |
3e8e88ca | 518 | .ioctl = pty_bsd_ioctl, |
5f0f187f | 519 | .compat_ioctl = pty_bsd_compat_ioctl, |
d03702a2 | 520 | .cleanup = pty_cleanup, |
d155255a AC |
521 | .resize = pty_resize, |
522 | .remove = pty_remove | |
3e8e88ca AC |
523 | }; |
524 | ||
342a5971 LT |
525 | static const struct tty_operations slave_pty_ops_bsd = { |
526 | .install = pty_install, | |
527 | .open = pty_open, | |
528 | .close = pty_close, | |
529 | .write = pty_write, | |
530 | .write_room = pty_write_room, | |
531 | .flush_buffer = pty_flush_buffer, | |
532 | .chars_in_buffer = pty_chars_in_buffer, | |
533 | .unthrottle = pty_unthrottle, | |
534 | .set_termios = pty_set_termios, | |
d03702a2 | 535 | .cleanup = pty_cleanup, |
d155255a | 536 | .resize = pty_resize, |
01adc807 PH |
537 | .start = pty_start, |
538 | .stop = pty_stop, | |
d155255a | 539 | .remove = pty_remove |
342a5971 LT |
540 | }; |
541 | ||
1da177e4 LT |
542 | static void __init legacy_pty_init(void) |
543 | { | |
342a5971 LT |
544 | struct tty_driver *pty_driver, *pty_slave_driver; |
545 | ||
dc8c8587 KS |
546 | if (legacy_count <= 0) |
547 | return; | |
1da177e4 | 548 | |
21aca2fa JS |
549 | pty_driver = tty_alloc_driver(legacy_count, |
550 | TTY_DRIVER_RESET_TERMIOS | | |
551 | TTY_DRIVER_REAL_RAW | | |
552 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 553 | if (IS_ERR(pty_driver)) |
1da177e4 LT |
554 | panic("Couldn't allocate pty driver"); |
555 | ||
21aca2fa JS |
556 | pty_slave_driver = tty_alloc_driver(legacy_count, |
557 | TTY_DRIVER_RESET_TERMIOS | | |
558 | TTY_DRIVER_REAL_RAW | | |
559 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 560 | if (IS_ERR(pty_slave_driver)) |
1da177e4 LT |
561 | panic("Couldn't allocate pty slave driver"); |
562 | ||
1da177e4 LT |
563 | pty_driver->driver_name = "pty_master"; |
564 | pty_driver->name = "pty"; | |
1da177e4 LT |
565 | pty_driver->major = PTY_MASTER_MAJOR; |
566 | pty_driver->minor_start = 0; | |
567 | pty_driver->type = TTY_DRIVER_TYPE_PTY; | |
568 | pty_driver->subtype = PTY_TYPE_MASTER; | |
569 | pty_driver->init_termios = tty_std_termios; | |
570 | pty_driver->init_termios.c_iflag = 0; | |
571 | pty_driver->init_termios.c_oflag = 0; | |
572 | pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
573 | pty_driver->init_termios.c_lflag = 0; | |
606d099c AC |
574 | pty_driver->init_termios.c_ispeed = 38400; |
575 | pty_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 576 | pty_driver->other = pty_slave_driver; |
342a5971 | 577 | tty_set_operations(pty_driver, &master_pty_ops_bsd); |
1da177e4 | 578 | |
1da177e4 LT |
579 | pty_slave_driver->driver_name = "pty_slave"; |
580 | pty_slave_driver->name = "ttyp"; | |
1da177e4 LT |
581 | pty_slave_driver->major = PTY_SLAVE_MAJOR; |
582 | pty_slave_driver->minor_start = 0; | |
583 | pty_slave_driver->type = TTY_DRIVER_TYPE_PTY; | |
584 | pty_slave_driver->subtype = PTY_TYPE_SLAVE; | |
585 | pty_slave_driver->init_termios = tty_std_termios; | |
586 | pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
587 | pty_slave_driver->init_termios.c_ispeed = 38400; |
588 | pty_slave_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 589 | pty_slave_driver->other = pty_driver; |
342a5971 | 590 | tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd); |
1da177e4 LT |
591 | |
592 | if (tty_register_driver(pty_driver)) | |
593 | panic("Couldn't register pty driver"); | |
594 | if (tty_register_driver(pty_slave_driver)) | |
595 | panic("Couldn't register pty slave driver"); | |
596 | } | |
597 | #else | |
598 | static inline void legacy_pty_init(void) { } | |
599 | #endif | |
600 | ||
601 | /* Unix98 devices */ | |
602 | #ifdef CONFIG_UNIX98_PTYS | |
d81ed103 AC |
603 | static struct cdev ptmx_cdev; |
604 | ||
6509f309 | 605 | /** |
311fc65c EB |
606 | * ptm_open_peer - open the peer of a pty |
607 | * @master: the open struct file of the ptmx device node | |
608 | * @tty: the master of the pty being opened | |
609 | * @flags: the flags for open | |
6509f309 | 610 | * |
311fc65c EB |
611 | * Provide a race free way for userspace to open the slave end of a pty |
612 | * (where they have the master fd and cannot access or trust the mount | |
613 | * namespace /dev/pts was mounted inside). | |
6509f309 | 614 | */ |
311fc65c | 615 | int ptm_open_peer(struct file *master, struct tty_struct *tty, int flags) |
6509f309 AB |
616 | { |
617 | int fd = -1; | |
311fc65c | 618 | struct file *filp; |
6509f309 | 619 | int retval = -EINVAL; |
311fc65c EB |
620 | struct path path; |
621 | ||
622 | if (tty->driver != ptm_driver) | |
623 | return -EIO; | |
6509f309 AB |
624 | |
625 | fd = get_unused_fd_flags(0); | |
626 | if (fd < 0) { | |
627 | retval = fd; | |
628 | goto err; | |
629 | } | |
630 | ||
311fc65c EB |
631 | /* Compute the slave's path */ |
632 | path.mnt = devpts_mntget(master, tty->driver_data); | |
633 | if (IS_ERR(path.mnt)) { | |
634 | retval = PTR_ERR(path.mnt); | |
635 | goto err_put; | |
636 | } | |
637 | path.dentry = tty->link->driver_data; | |
638 | ||
639 | filp = dentry_open(&path, flags, current_cred()); | |
640 | mntput(path.mnt); | |
6509f309 AB |
641 | if (IS_ERR(filp)) { |
642 | retval = PTR_ERR(filp); | |
643 | goto err_put; | |
644 | } | |
645 | ||
646 | fd_install(fd, filp); | |
647 | return fd; | |
648 | ||
649 | err_put: | |
650 | put_unused_fd(fd); | |
651 | err: | |
652 | return retval; | |
653 | } | |
654 | ||
6caa76b7 | 655 | static int pty_unix98_ioctl(struct tty_struct *tty, |
1da177e4 LT |
656 | unsigned int cmd, unsigned long arg) |
657 | { | |
658 | switch (cmd) { | |
659 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ | |
660 | return pty_set_lock(tty, (int __user *)arg); | |
84fd7bdf CG |
661 | case TIOCGPTLCK: /* Get PT Lock status */ |
662 | return pty_get_lock(tty, (int __user *)arg); | |
06026d91 CG |
663 | case TIOCPKT: /* Set PT packet mode */ |
664 | return pty_set_pktmode(tty, (int __user *)arg); | |
84fd7bdf CG |
665 | case TIOCGPKT: /* Get PT packet mode */ |
666 | return pty_get_pktmode(tty, (int __user *)arg); | |
1da177e4 LT |
667 | case TIOCGPTN: /* Get PT Number */ |
668 | return put_user(tty->index, (unsigned int __user *)arg); | |
26df6d13 | 669 | case TIOCSIG: /* Send signal to other side of pty */ |
670 | return pty_signal(tty, (int) arg); | |
1da177e4 LT |
671 | } |
672 | ||
673 | return -ENOIOCTLCMD; | |
674 | } | |
675 | ||
5f0f187f AS |
676 | static long pty_unix98_compat_ioctl(struct tty_struct *tty, |
677 | unsigned int cmd, unsigned long arg) | |
678 | { | |
679 | /* | |
680 | * PTY ioctls don't require any special translation between 32-bit and | |
681 | * 64-bit userspace, they are already compatible. | |
682 | */ | |
683 | return pty_unix98_ioctl(tty, cmd, arg); | |
684 | } | |
685 | ||
99f1fe18 AC |
686 | /** |
687 | * ptm_unix98_lookup - find a pty master | |
688 | * @driver: ptm driver | |
689 | * @idx: tty index | |
690 | * | |
691 | * Look up a pty master device. Called under the tty_mutex for now. | |
692 | * This provides our locking. | |
693 | */ | |
694 | ||
15f1a633 | 695 | static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, |
8ead9dd5 | 696 | struct file *file, int idx) |
99f1fe18 | 697 | { |
593a27c4 KK |
698 | /* Master must be open via /dev/ptmx */ |
699 | return ERR_PTR(-EIO); | |
99f1fe18 AC |
700 | } |
701 | ||
702 | /** | |
703 | * pts_unix98_lookup - find a pty slave | |
704 | * @driver: pts driver | |
705 | * @idx: tty index | |
706 | * | |
707 | * Look up a pty master device. Called under the tty_mutex for now. | |
d739e65b | 708 | * This provides our locking for the tty pointer. |
99f1fe18 AC |
709 | */ |
710 | ||
15f1a633 | 711 | static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver, |
8ead9dd5 | 712 | struct file *file, int idx) |
99f1fe18 | 713 | { |
d739e65b AC |
714 | struct tty_struct *tty; |
715 | ||
716 | mutex_lock(&devpts_mutex); | |
8ead9dd5 | 717 | tty = devpts_get_priv(file->f_path.dentry); |
d739e65b | 718 | mutex_unlock(&devpts_mutex); |
99f1fe18 AC |
719 | /* Master must be open before slave */ |
720 | if (!tty) | |
721 | return ERR_PTR(-EIO); | |
722 | return tty; | |
723 | } | |
724 | ||
bf970ee4 | 725 | static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty) |
8b0a88d5 | 726 | { |
5d249bc6 | 727 | return pty_common_install(driver, tty, false); |
8b0a88d5 AC |
728 | } |
729 | ||
f4b208eb | 730 | /* this is called once with whichever end is closed last */ |
c1e33af1 | 731 | static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty) |
f4b208eb | 732 | { |
67245ff3 | 733 | struct pts_fs_info *fsi; |
2831c89f HK |
734 | |
735 | if (tty->driver->subtype == PTY_TYPE_MASTER) | |
67245ff3 | 736 | fsi = tty->driver_data; |
2831c89f | 737 | else |
67245ff3 | 738 | fsi = tty->link->driver_data; |
5353ed8d CIK |
739 | |
740 | if (fsi) { | |
741 | devpts_kill_index(fsi, tty->index); | |
742 | devpts_release(fsi); | |
743 | } | |
f4b208eb JS |
744 | } |
745 | ||
d01c3289 MY |
746 | static void pty_show_fdinfo(struct tty_struct *tty, struct seq_file *m) |
747 | { | |
748 | seq_printf(m, "tty-index:\t%d\n", tty->index); | |
749 | } | |
750 | ||
feebed65 | 751 | static const struct tty_operations ptm_unix98_ops = { |
99f1fe18 | 752 | .lookup = ptm_unix98_lookup, |
bf970ee4 | 753 | .install = pty_unix98_install, |
7171604a | 754 | .remove = pty_unix98_remove, |
3e8e88ca AC |
755 | .open = pty_open, |
756 | .close = pty_close, | |
757 | .write = pty_write, | |
758 | .write_room = pty_write_room, | |
759 | .flush_buffer = pty_flush_buffer, | |
760 | .chars_in_buffer = pty_chars_in_buffer, | |
761 | .unthrottle = pty_unthrottle, | |
feebed65 | 762 | .ioctl = pty_unix98_ioctl, |
5f0f187f | 763 | .compat_ioctl = pty_unix98_compat_ioctl, |
36b3c070 | 764 | .resize = pty_resize, |
d01c3289 MY |
765 | .cleanup = pty_cleanup, |
766 | .show_fdinfo = pty_show_fdinfo, | |
3e8e88ca AC |
767 | }; |
768 | ||
99f1fe18 AC |
769 | static const struct tty_operations pty_unix98_ops = { |
770 | .lookup = pts_unix98_lookup, | |
bf970ee4 | 771 | .install = pty_unix98_install, |
7171604a | 772 | .remove = pty_unix98_remove, |
99f1fe18 AC |
773 | .open = pty_open, |
774 | .close = pty_close, | |
775 | .write = pty_write, | |
776 | .write_room = pty_write_room, | |
777 | .flush_buffer = pty_flush_buffer, | |
778 | .chars_in_buffer = pty_chars_in_buffer, | |
779 | .unthrottle = pty_unthrottle, | |
780 | .set_termios = pty_set_termios, | |
01adc807 PH |
781 | .start = pty_start, |
782 | .stop = pty_stop, | |
d03702a2 | 783 | .cleanup = pty_cleanup, |
99f1fe18 | 784 | }; |
d81ed103 AC |
785 | |
786 | /** | |
787 | * ptmx_open - open a unix 98 pty master | |
788 | * @inode: inode of device file | |
789 | * @filp: file pointer to tty | |
790 | * | |
791 | * Allocate a unix98 pty master device from the ptmx driver. | |
792 | * | |
793 | * Locking: tty_mutex protects the init_dev work. tty->count should | |
b9f8033f | 794 | * protect the rest. |
d81ed103 AC |
795 | * allocated_ptys_lock handles the list of free pty numbers |
796 | */ | |
797 | ||
64ba3dc3 | 798 | static int ptmx_open(struct inode *inode, struct file *filp) |
d81ed103 | 799 | { |
67245ff3 | 800 | struct pts_fs_info *fsi; |
d81ed103 | 801 | struct tty_struct *tty; |
8ead9dd5 | 802 | struct dentry *dentry; |
d81ed103 AC |
803 | int retval; |
804 | int index; | |
805 | ||
806 | nonseekable_open(inode, filp); | |
807 | ||
b0b88565 LT |
808 | /* We refuse fsnotify events on ptmx, since it's a shared resource */ |
809 | filp->f_mode |= FMODE_NONOTIFY; | |
810 | ||
fa90e1c9 JS |
811 | retval = tty_alloc_file(filp); |
812 | if (retval) | |
813 | return retval; | |
814 | ||
143c97cc | 815 | fsi = devpts_acquire(filp); |
eedf265a EB |
816 | if (IS_ERR(fsi)) { |
817 | retval = PTR_ERR(fsi); | |
67245ff3 | 818 | goto out_free_file; |
eedf265a | 819 | } |
67245ff3 | 820 | |
d81ed103 | 821 | /* find a device that is not in use. */ |
89c8d91e | 822 | mutex_lock(&devpts_mutex); |
67245ff3 | 823 | index = devpts_new_index(fsi); |
89c8d91e AC |
824 | mutex_unlock(&devpts_mutex); |
825 | ||
67245ff3 LT |
826 | retval = index; |
827 | if (index < 0) | |
eedf265a | 828 | goto out_put_fsi; |
d81ed103 | 829 | |
d81ed103 | 830 | |
67245ff3 LT |
831 | mutex_lock(&tty_mutex); |
832 | tty = tty_init_dev(ptm_driver, index); | |
89c8d91e AC |
833 | /* The tty returned here is locked so we can safely |
834 | drop the mutex */ | |
835 | mutex_unlock(&tty_mutex); | |
836 | ||
67245ff3 LT |
837 | retval = PTR_ERR(tty); |
838 | if (IS_ERR(tty)) | |
839 | goto out; | |
ee2ffa0d | 840 | |
2831c89f | 841 | /* |
67245ff3 LT |
842 | * From here on out, the tty is "live", and the index and |
843 | * fsi will be killed/put by the tty_release() | |
2831c89f | 844 | */ |
67245ff3 LT |
845 | set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ |
846 | tty->driver_data = fsi; | |
2831c89f | 847 | |
fa90e1c9 | 848 | tty_add_file(tty, filp); |
d81ed103 | 849 | |
8ead9dd5 LT |
850 | dentry = devpts_pty_new(fsi, index, tty->link); |
851 | if (IS_ERR(dentry)) { | |
852 | retval = PTR_ERR(dentry); | |
1177c0ef | 853 | goto err_release; |
162b97cf | 854 | } |
311fc65c | 855 | tty->link->driver_data = dentry; |
d81ed103 AC |
856 | |
857 | retval = ptm_driver->ops->open(tty, filp); | |
64ba3dc3 | 858 | if (retval) |
311fc65c | 859 | goto err_release; |
1177c0ef | 860 | |
d435cefe | 861 | tty_debug_hangup(tty, "opening (count=%d)\n", tty->count); |
d6847793 | 862 | |
89c8d91e | 863 | tty_unlock(tty); |
1177c0ef JS |
864 | return 0; |
865 | err_release: | |
89c8d91e | 866 | tty_unlock(tty); |
67245ff3 | 867 | // This will also put-ref the fsi |
eeb89d91 | 868 | tty_release(inode, filp); |
d81ed103 AC |
869 | return retval; |
870 | out: | |
67245ff3 | 871 | devpts_kill_index(fsi, index); |
eedf265a EB |
872 | out_put_fsi: |
873 | devpts_release(fsi); | |
67245ff3 | 874 | out_free_file: |
fa90e1c9 | 875 | tty_free_file(filp); |
64ba3dc3 | 876 | return retval; |
d81ed103 AC |
877 | } |
878 | ||
d2ec3f77 | 879 | static struct file_operations ptmx_fops __ro_after_init; |
d81ed103 | 880 | |
1da177e4 LT |
881 | static void __init unix98_pty_init(void) |
882 | { | |
21aca2fa JS |
883 | ptm_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(ptm_driver)) |
1da177e4 | 890 | panic("Couldn't allocate Unix98 ptm driver"); |
21aca2fa JS |
891 | pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
892 | TTY_DRIVER_RESET_TERMIOS | | |
893 | TTY_DRIVER_REAL_RAW | | |
894 | TTY_DRIVER_DYNAMIC_DEV | | |
895 | TTY_DRIVER_DEVPTS_MEM | | |
896 | TTY_DRIVER_DYNAMIC_ALLOC); | |
c3a6344a | 897 | if (IS_ERR(pts_driver)) |
1da177e4 LT |
898 | panic("Couldn't allocate Unix98 pts driver"); |
899 | ||
1da177e4 LT |
900 | ptm_driver->driver_name = "pty_master"; |
901 | ptm_driver->name = "ptm"; | |
902 | ptm_driver->major = UNIX98_PTY_MASTER_MAJOR; | |
903 | ptm_driver->minor_start = 0; | |
904 | ptm_driver->type = TTY_DRIVER_TYPE_PTY; | |
905 | ptm_driver->subtype = PTY_TYPE_MASTER; | |
906 | ptm_driver->init_termios = tty_std_termios; | |
907 | ptm_driver->init_termios.c_iflag = 0; | |
908 | ptm_driver->init_termios.c_oflag = 0; | |
909 | ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
910 | ptm_driver->init_termios.c_lflag = 0; | |
606d099c AC |
911 | ptm_driver->init_termios.c_ispeed = 38400; |
912 | ptm_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 913 | ptm_driver->other = pts_driver; |
feebed65 | 914 | tty_set_operations(ptm_driver, &ptm_unix98_ops); |
1da177e4 | 915 | |
1da177e4 LT |
916 | pts_driver->driver_name = "pty_slave"; |
917 | pts_driver->name = "pts"; | |
918 | pts_driver->major = UNIX98_PTY_SLAVE_MAJOR; | |
919 | pts_driver->minor_start = 0; | |
920 | pts_driver->type = TTY_DRIVER_TYPE_PTY; | |
921 | pts_driver->subtype = PTY_TYPE_SLAVE; | |
922 | pts_driver->init_termios = tty_std_termios; | |
923 | pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; | |
606d099c AC |
924 | pts_driver->init_termios.c_ispeed = 38400; |
925 | pts_driver->init_termios.c_ospeed = 38400; | |
1da177e4 | 926 | pts_driver->other = ptm_driver; |
99f1fe18 | 927 | tty_set_operations(pts_driver, &pty_unix98_ops); |
fe9cd962 | 928 | |
1da177e4 LT |
929 | if (tty_register_driver(ptm_driver)) |
930 | panic("Couldn't register Unix98 ptm driver"); | |
931 | if (tty_register_driver(pts_driver)) | |
932 | panic("Couldn't register Unix98 pts driver"); | |
933 | ||
d81ed103 AC |
934 | /* Now create the /dev/ptmx special device */ |
935 | tty_default_fops(&ptmx_fops); | |
936 | ptmx_fops.open = ptmx_open; | |
937 | ||
938 | cdev_init(&ptmx_cdev, &ptmx_fops); | |
939 | if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) || | |
940 | register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0) | |
82f8c35f | 941 | panic("Couldn't register /dev/ptmx driver"); |
d81ed103 | 942 | device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); |
1da177e4 | 943 | } |
d81ed103 | 944 | |
1da177e4 LT |
945 | #else |
946 | static inline void unix98_pty_init(void) { } | |
947 | #endif | |
948 | ||
949 | static int __init pty_init(void) | |
950 | { | |
951 | legacy_pty_init(); | |
952 | unix98_pty_init(); | |
953 | return 0; | |
954 | } | |
7154988f | 955 | device_initcall(pty_init); |