Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
3 | * | |
4 | * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines | |
5 | * which can be dynamically activated and de-activated by the line | |
6 | * discipline handling modules (like SLIP). | |
7 | */ | |
8 | ||
9 | #include <linux/types.h> | |
10 | #include <linux/termios.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/major.h> | |
15 | #include <linux/tty.h> | |
16 | #include <linux/fcntl.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/bitops.h> | |
5785c95b | 21 | #include <linux/mutex.h> |
8193c429 | 22 | #include <linux/compat.h> |
1da177e4 LT |
23 | |
24 | #include <asm/io.h> | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/system.h> | |
27 | ||
28 | #undef TTY_DEBUG_WAIT_UNTIL_SENT | |
29 | ||
30 | #undef DEBUG | |
31 | ||
32 | /* | |
33 | * Internal flag options for termios setting behavior | |
34 | */ | |
35 | #define TERMIOS_FLUSH 1 | |
36 | #define TERMIOS_WAIT 2 | |
37 | #define TERMIOS_TERMIO 4 | |
edc6afc5 | 38 | #define TERMIOS_OLD 8 |
1da177e4 | 39 | |
af9b897e | 40 | |
d81ed103 AC |
41 | /** |
42 | * tty_chars_in_buffer - characters pending | |
43 | * @tty: terminal | |
44 | * | |
45 | * Return the number of bytes of data in the device private | |
46 | * output queue. If no private method is supplied there is assumed | |
47 | * to be no queue on the device. | |
48 | */ | |
49 | ||
f34d7a5b AC |
50 | int tty_chars_in_buffer(struct tty_struct *tty) |
51 | { | |
52 | if (tty->ops->chars_in_buffer) | |
53 | return tty->ops->chars_in_buffer(tty); | |
54 | else | |
55 | return 0; | |
56 | } | |
f34d7a5b AC |
57 | EXPORT_SYMBOL(tty_chars_in_buffer); |
58 | ||
d81ed103 AC |
59 | /** |
60 | * tty_write_room - write queue space | |
61 | * @tty: terminal | |
62 | * | |
63 | * Return the number of bytes that can be queued to this device | |
64 | * at the present time. The result should be treated as a guarantee | |
65 | * and the driver cannot offer a value it later shrinks by more than | |
66 | * the number of bytes written. If no method is provided 2K is always | |
67 | * returned and data may be lost as there will be no flow control. | |
68 | */ | |
69 | ||
f34d7a5b AC |
70 | int tty_write_room(struct tty_struct *tty) |
71 | { | |
72 | if (tty->ops->write_room) | |
73 | return tty->ops->write_room(tty); | |
74 | return 2048; | |
75 | } | |
f34d7a5b AC |
76 | EXPORT_SYMBOL(tty_write_room); |
77 | ||
d81ed103 AC |
78 | /** |
79 | * tty_driver_flush_buffer - discard internal buffer | |
80 | * @tty: terminal | |
81 | * | |
82 | * Discard the internal output buffer for this device. If no method | |
83 | * is provided then either the buffer cannot be hardware flushed or | |
84 | * there is no buffer driver side. | |
85 | */ | |
f34d7a5b AC |
86 | void tty_driver_flush_buffer(struct tty_struct *tty) |
87 | { | |
88 | if (tty->ops->flush_buffer) | |
89 | tty->ops->flush_buffer(tty); | |
90 | } | |
f34d7a5b AC |
91 | EXPORT_SYMBOL(tty_driver_flush_buffer); |
92 | ||
d81ed103 AC |
93 | /** |
94 | * tty_throttle - flow control | |
95 | * @tty: terminal | |
96 | * | |
97 | * Indicate that a tty should stop transmitting data down the stack. | |
38db8979 AC |
98 | * Takes the termios mutex to protect against parallel throttle/unthrottle |
99 | * and also to ensure the driver can consistently reference its own | |
100 | * termios data at this point when implementing software flow control. | |
d81ed103 AC |
101 | */ |
102 | ||
39c2e60f AC |
103 | void tty_throttle(struct tty_struct *tty) |
104 | { | |
38db8979 | 105 | mutex_lock(&tty->termios_mutex); |
39c2e60f AC |
106 | /* check TTY_THROTTLED first so it indicates our state */ |
107 | if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) && | |
108 | tty->ops->throttle) | |
109 | tty->ops->throttle(tty); | |
38db8979 | 110 | mutex_unlock(&tty->termios_mutex); |
39c2e60f AC |
111 | } |
112 | EXPORT_SYMBOL(tty_throttle); | |
113 | ||
d81ed103 AC |
114 | /** |
115 | * tty_unthrottle - flow control | |
116 | * @tty: terminal | |
117 | * | |
118 | * Indicate that a tty may continue transmitting data down the stack. | |
38db8979 AC |
119 | * Takes the termios mutex to protect against parallel throttle/unthrottle |
120 | * and also to ensure the driver can consistently reference its own | |
121 | * termios data at this point when implementing software flow control. | |
122 | * | |
123 | * Drivers should however remember that the stack can issue a throttle, | |
124 | * then change flow control method, then unthrottle. | |
d81ed103 AC |
125 | */ |
126 | ||
39c2e60f AC |
127 | void tty_unthrottle(struct tty_struct *tty) |
128 | { | |
38db8979 | 129 | mutex_lock(&tty->termios_mutex); |
39c2e60f AC |
130 | if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) && |
131 | tty->ops->unthrottle) | |
132 | tty->ops->unthrottle(tty); | |
38db8979 | 133 | mutex_unlock(&tty->termios_mutex); |
39c2e60f AC |
134 | } |
135 | EXPORT_SYMBOL(tty_unthrottle); | |
f34d7a5b | 136 | |
af9b897e AC |
137 | /** |
138 | * tty_wait_until_sent - wait for I/O to finish | |
139 | * @tty: tty we are waiting for | |
140 | * @timeout: how long we will wait | |
141 | * | |
142 | * Wait for characters pending in a tty driver to hit the wire, or | |
143 | * for a timeout to occur (eg due to flow control) | |
144 | * | |
145 | * Locking: none | |
146 | */ | |
147 | ||
355d95a1 | 148 | void tty_wait_until_sent(struct tty_struct *tty, long timeout) |
1da177e4 | 149 | { |
1da177e4 LT |
150 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT |
151 | char buf[64]; | |
355d95a1 | 152 | |
1da177e4 LT |
153 | printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf)); |
154 | #endif | |
1da177e4 LT |
155 | if (!timeout) |
156 | timeout = MAX_SCHEDULE_TIMEOUT; | |
5a52bd4a | 157 | if (wait_event_interruptible_timeout(tty->write_wait, |
f34d7a5b AC |
158 | !tty_chars_in_buffer(tty), timeout) >= 0) { |
159 | if (tty->ops->wait_until_sent) | |
160 | tty->ops->wait_until_sent(tty, timeout); | |
0ee9cbb3 | 161 | } |
1da177e4 | 162 | } |
1da177e4 LT |
163 | EXPORT_SYMBOL(tty_wait_until_sent); |
164 | ||
d81ed103 AC |
165 | |
166 | /* | |
167 | * Termios Helper Methods | |
168 | */ | |
169 | ||
edc6afc5 AC |
170 | static void unset_locked_termios(struct ktermios *termios, |
171 | struct ktermios *old, | |
172 | struct ktermios *locked) | |
1da177e4 LT |
173 | { |
174 | int i; | |
355d95a1 AC |
175 | |
176 | #define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z))) | |
1da177e4 LT |
177 | |
178 | if (!locked) { | |
179 | printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n"); | |
180 | return; | |
181 | } | |
182 | ||
183 | NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag); | |
184 | NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag); | |
185 | NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag); | |
186 | NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag); | |
187 | termios->c_line = locked->c_line ? old->c_line : termios->c_line; | |
355d95a1 | 188 | for (i = 0; i < NCCS; i++) |
1da177e4 LT |
189 | termios->c_cc[i] = locked->c_cc[i] ? |
190 | old->c_cc[i] : termios->c_cc[i]; | |
edc6afc5 | 191 | /* FIXME: What should we do for i/ospeed */ |
1da177e4 LT |
192 | } |
193 | ||
edc6afc5 AC |
194 | /* |
195 | * Routine which returns the baud rate of the tty | |
196 | * | |
197 | * Note that the baud_table needs to be kept in sync with the | |
198 | * include/asm/termbits.h file. | |
199 | */ | |
200 | static const speed_t baud_table[] = { | |
201 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
202 | 9600, 19200, 38400, 57600, 115200, 230400, 460800, | |
203 | #ifdef __sparc__ | |
204 | 76800, 153600, 307200, 614400, 921600 | |
205 | #else | |
206 | 500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000, | |
207 | 2500000, 3000000, 3500000, 4000000 | |
208 | #endif | |
209 | }; | |
210 | ||
211 | #ifndef __sparc__ | |
212 | static const tcflag_t baud_bits[] = { | |
213 | B0, B50, B75, B110, B134, B150, B200, B300, B600, | |
214 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, | |
215 | B57600, B115200, B230400, B460800, B500000, B576000, | |
216 | B921600, B1000000, B1152000, B1500000, B2000000, B2500000, | |
217 | B3000000, B3500000, B4000000 | |
218 | }; | |
219 | #else | |
220 | static const tcflag_t baud_bits[] = { | |
221 | B0, B50, B75, B110, B134, B150, B200, B300, B600, | |
222 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, | |
223 | B57600, B115200, B230400, B460800, B76800, B153600, | |
224 | B307200, B614400, B921600 | |
225 | }; | |
226 | #endif | |
227 | ||
228 | static int n_baud_table = ARRAY_SIZE(baud_table); | |
229 | ||
230 | /** | |
231 | * tty_termios_baud_rate | |
232 | * @termios: termios structure | |
233 | * | |
234 | * Convert termios baud rate data into a speed. This should be called | |
235 | * with the termios lock held if this termios is a terminal termios | |
236 | * structure. May change the termios data. Device drivers can call this | |
237 | * function but should use ->c_[io]speed directly as they are updated. | |
238 | * | |
239 | * Locking: none | |
240 | */ | |
241 | ||
242 | speed_t tty_termios_baud_rate(struct ktermios *termios) | |
243 | { | |
244 | unsigned int cbaud; | |
245 | ||
246 | cbaud = termios->c_cflag & CBAUD; | |
247 | ||
248 | #ifdef BOTHER | |
25985edc | 249 | /* Magic token for arbitrary speed via c_ispeed/c_ospeed */ |
edc6afc5 AC |
250 | if (cbaud == BOTHER) |
251 | return termios->c_ospeed; | |
252 | #endif | |
253 | if (cbaud & CBAUDEX) { | |
254 | cbaud &= ~CBAUDEX; | |
255 | ||
256 | if (cbaud < 1 || cbaud + 15 > n_baud_table) | |
257 | termios->c_cflag &= ~CBAUDEX; | |
258 | else | |
259 | cbaud += 15; | |
260 | } | |
261 | return baud_table[cbaud]; | |
262 | } | |
edc6afc5 AC |
263 | EXPORT_SYMBOL(tty_termios_baud_rate); |
264 | ||
265 | /** | |
266 | * tty_termios_input_baud_rate | |
267 | * @termios: termios structure | |
268 | * | |
269 | * Convert termios baud rate data into a speed. This should be called | |
270 | * with the termios lock held if this termios is a terminal termios | |
271 | * structure. May change the termios data. Device drivers can call this | |
272 | * function but should use ->c_[io]speed directly as they are updated. | |
273 | * | |
274 | * Locking: none | |
275 | */ | |
276 | ||
277 | speed_t tty_termios_input_baud_rate(struct ktermios *termios) | |
278 | { | |
279 | #ifdef IBSHIFT | |
280 | unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD; | |
281 | ||
282 | if (cbaud == B0) | |
283 | return tty_termios_baud_rate(termios); | |
284 | ||
25985edc | 285 | /* Magic token for arbitrary speed via c_ispeed*/ |
edc6afc5 AC |
286 | if (cbaud == BOTHER) |
287 | return termios->c_ispeed; | |
288 | ||
289 | if (cbaud & CBAUDEX) { | |
290 | cbaud &= ~CBAUDEX; | |
291 | ||
292 | if (cbaud < 1 || cbaud + 15 > n_baud_table) | |
293 | termios->c_cflag &= ~(CBAUDEX << IBSHIFT); | |
294 | else | |
295 | cbaud += 15; | |
296 | } | |
297 | return baud_table[cbaud]; | |
298 | #else | |
299 | return tty_termios_baud_rate(termios); | |
300 | #endif | |
301 | } | |
edc6afc5 AC |
302 | EXPORT_SYMBOL(tty_termios_input_baud_rate); |
303 | ||
edc6afc5 AC |
304 | /** |
305 | * tty_termios_encode_baud_rate | |
78137e3b | 306 | * @termios: ktermios structure holding user requested state |
edc6afc5 AC |
307 | * @ispeed: input speed |
308 | * @ospeed: output speed | |
309 | * | |
310 | * Encode the speeds set into the passed termios structure. This is | |
f98e5b80 | 311 | * used as a library helper for drivers so that they can report back |
edc6afc5 AC |
312 | * the actual speed selected when it differs from the speed requested |
313 | * | |
78137e3b AC |
314 | * For maximal back compatibility with legacy SYS5/POSIX *nix behaviour |
315 | * we need to carefully set the bits when the user does not get the | |
316 | * desired speed. We allow small margins and preserve as much of possible | |
06fe9fb4 | 317 | * of the input intent to keep compatibility. |
edc6afc5 AC |
318 | * |
319 | * Locking: Caller should hold termios lock. This is already held | |
320 | * when calling this function from the driver termios handler. | |
5f519d72 AC |
321 | * |
322 | * The ifdefs deal with platforms whose owners have yet to update them | |
323 | * and will all go away once this is done. | |
edc6afc5 AC |
324 | */ |
325 | ||
75e8b71d MR |
326 | void tty_termios_encode_baud_rate(struct ktermios *termios, |
327 | speed_t ibaud, speed_t obaud) | |
edc6afc5 AC |
328 | { |
329 | int i = 0; | |
78137e3b AC |
330 | int ifound = -1, ofound = -1; |
331 | int iclose = ibaud/50, oclose = obaud/50; | |
332 | int ibinput = 0; | |
edc6afc5 | 333 | |
5f519d72 AC |
334 | if (obaud == 0) /* CD dropped */ |
335 | ibaud = 0; /* Clear ibaud to be sure */ | |
336 | ||
edc6afc5 AC |
337 | termios->c_ispeed = ibaud; |
338 | termios->c_ospeed = obaud; | |
339 | ||
5f519d72 | 340 | #ifdef BOTHER |
78137e3b AC |
341 | /* If the user asked for a precise weird speed give a precise weird |
342 | answer. If they asked for a Bfoo speed they many have problems | |
343 | digesting non-exact replies so fuzz a bit */ | |
344 | ||
345 | if ((termios->c_cflag & CBAUD) == BOTHER) | |
346 | oclose = 0; | |
347 | if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER) | |
348 | iclose = 0; | |
349 | if ((termios->c_cflag >> IBSHIFT) & CBAUD) | |
350 | ibinput = 1; /* An input speed was specified */ | |
5f519d72 | 351 | #endif |
edc6afc5 | 352 | termios->c_cflag &= ~CBAUD; |
edc6afc5 | 353 | |
5f519d72 AC |
354 | /* |
355 | * Our goal is to find a close match to the standard baud rate | |
356 | * returned. Walk the baud rate table and if we get a very close | |
357 | * match then report back the speed as a POSIX Bxxxx value by | |
358 | * preference | |
359 | */ | |
360 | ||
edc6afc5 | 361 | do { |
75e8b71d MR |
362 | if (obaud - oclose <= baud_table[i] && |
363 | obaud + oclose >= baud_table[i]) { | |
edc6afc5 | 364 | termios->c_cflag |= baud_bits[i]; |
78137e3b | 365 | ofound = i; |
edc6afc5 | 366 | } |
75e8b71d MR |
367 | if (ibaud - iclose <= baud_table[i] && |
368 | ibaud + iclose >= baud_table[i]) { | |
369 | /* For the case input == output don't set IBAUD bits | |
370 | if the user didn't do so */ | |
5f519d72 AC |
371 | if (ofound == i && !ibinput) |
372 | ifound = i; | |
373 | #ifdef IBSHIFT | |
374 | else { | |
375 | ifound = i; | |
78137e3b | 376 | termios->c_cflag |= (baud_bits[i] << IBSHIFT); |
5f519d72 AC |
377 | } |
378 | #endif | |
edc6afc5 | 379 | } |
6804396f | 380 | } while (++i < n_baud_table); |
5f519d72 AC |
381 | |
382 | /* | |
383 | * If we found no match then use BOTHER if provided or warn | |
384 | * the user their platform maintainer needs to wake up if not. | |
385 | */ | |
386 | #ifdef BOTHER | |
78137e3b | 387 | if (ofound == -1) |
edc6afc5 | 388 | termios->c_cflag |= BOTHER; |
78137e3b AC |
389 | /* Set exact input bits only if the input and output differ or the |
390 | user already did */ | |
6804396f | 391 | if (ifound == -1 && (ibaud != obaud || ibinput)) |
edc6afc5 | 392 | termios->c_cflag |= (BOTHER << IBSHIFT); |
5f519d72 AC |
393 | #else |
394 | if (ifound == -1 || ofound == -1) { | |
9074d963 | 395 | printk_once(KERN_WARNING "tty: Unable to return correct " |
5f519d72 AC |
396 | "speed data as your architecture needs updating.\n"); |
397 | } | |
398 | #endif | |
edc6afc5 | 399 | } |
edc6afc5 AC |
400 | EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate); |
401 | ||
d81ed103 AC |
402 | /** |
403 | * tty_encode_baud_rate - set baud rate of the tty | |
404 | * @ibaud: input baud rate | |
405 | * @obad: output baud rate | |
406 | * | |
407 | * Update the current termios data for the tty with the new speed | |
408 | * settings. The caller must hold the termios_mutex for the tty in | |
409 | * question. | |
410 | */ | |
411 | ||
5f519d72 AC |
412 | void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud) |
413 | { | |
414 | tty_termios_encode_baud_rate(tty->termios, ibaud, obaud); | |
415 | } | |
416 | EXPORT_SYMBOL_GPL(tty_encode_baud_rate); | |
edc6afc5 AC |
417 | |
418 | /** | |
419 | * tty_get_baud_rate - get tty bit rates | |
420 | * @tty: tty to query | |
421 | * | |
422 | * Returns the baud rate as an integer for this terminal. The | |
423 | * termios lock must be held by the caller and the terminal bit | |
424 | * flags may be updated. | |
425 | * | |
426 | * Locking: none | |
427 | */ | |
428 | ||
429 | speed_t tty_get_baud_rate(struct tty_struct *tty) | |
430 | { | |
431 | speed_t baud = tty_termios_baud_rate(tty->termios); | |
432 | ||
433 | if (baud == 38400 && tty->alt_speed) { | |
434 | if (!tty->warned) { | |
435 | printk(KERN_WARNING "Use of setserial/setrocket to " | |
436 | "set SPD_* flags is deprecated\n"); | |
437 | tty->warned = 1; | |
438 | } | |
439 | baud = tty->alt_speed; | |
440 | } | |
441 | ||
442 | return baud; | |
443 | } | |
edc6afc5 AC |
444 | EXPORT_SYMBOL(tty_get_baud_rate); |
445 | ||
5f519d72 AC |
446 | /** |
447 | * tty_termios_copy_hw - copy hardware settings | |
448 | * @new: New termios | |
449 | * @old: Old termios | |
450 | * | |
25985edc | 451 | * Propagate the hardware specific terminal setting bits from |
5f519d72 AC |
452 | * the old termios structure to the new one. This is used in cases |
453 | * where the hardware does not support reconfiguration or as a helper | |
454 | * in some cases where only minimal reconfiguration is supported | |
455 | */ | |
456 | ||
457 | void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old) | |
458 | { | |
459 | /* The bits a dumb device handles in software. Smart devices need | |
460 | to always provide a set_termios method */ | |
461 | new->c_cflag &= HUPCL | CREAD | CLOCAL; | |
462 | new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL); | |
463 | new->c_ispeed = old->c_ispeed; | |
464 | new->c_ospeed = old->c_ospeed; | |
465 | } | |
5f519d72 AC |
466 | EXPORT_SYMBOL(tty_termios_copy_hw); |
467 | ||
bf5e5834 AC |
468 | /** |
469 | * tty_termios_hw_change - check for setting change | |
470 | * @a: termios | |
471 | * @b: termios to compare | |
472 | * | |
473 | * Check if any of the bits that affect a dumb device have changed | |
474 | * between the two termios structures, or a speed change is needed. | |
475 | */ | |
476 | ||
477 | int tty_termios_hw_change(struct ktermios *a, struct ktermios *b) | |
478 | { | |
479 | if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed) | |
480 | return 1; | |
481 | if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL)) | |
482 | return 1; | |
483 | return 0; | |
484 | } | |
485 | EXPORT_SYMBOL(tty_termios_hw_change); | |
486 | ||
af9b897e | 487 | /** |
8d075b19 | 488 | * tty_set_termios - update termios values |
af9b897e AC |
489 | * @tty: tty to update |
490 | * @new_termios: desired new value | |
491 | * | |
492 | * Perform updates to the termios values set on this terminal. There | |
493 | * is a bit of layering violation here with n_tty in terms of the | |
494 | * internal knowledge of this function. | |
495 | * | |
d81ed103 | 496 | * Locking: termios_mutex |
af9b897e AC |
497 | */ |
498 | ||
8d075b19 | 499 | int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios) |
1da177e4 | 500 | { |
978e595f | 501 | struct ktermios old_termios; |
1da177e4 | 502 | struct tty_ldisc *ld; |
04f378b1 | 503 | unsigned long flags; |
355d95a1 | 504 | |
1da177e4 LT |
505 | /* |
506 | * Perform the actual termios internal changes under lock. | |
507 | */ | |
355d95a1 | 508 | |
1da177e4 LT |
509 | |
510 | /* FIXME: we need to decide on some locking/ordering semantics | |
511 | for the set_termios notification eventually */ | |
5785c95b | 512 | mutex_lock(&tty->termios_mutex); |
978e595f | 513 | old_termios = *tty->termios; |
1da177e4 LT |
514 | *tty->termios = *new_termios; |
515 | unset_locked_termios(tty->termios, &old_termios, tty->termios_locked); | |
1da177e4 LT |
516 | |
517 | /* See if packet mode change of state. */ | |
1da177e4 | 518 | if (tty->link && tty->link->packet) { |
26df6d13 | 519 | int extproc = (old_termios.c_lflag & EXTPROC) | |
520 | (tty->termios->c_lflag & EXTPROC); | |
1da177e4 LT |
521 | int old_flow = ((old_termios.c_iflag & IXON) && |
522 | (old_termios.c_cc[VSTOP] == '\023') && | |
523 | (old_termios.c_cc[VSTART] == '\021')); | |
524 | int new_flow = (I_IXON(tty) && | |
525 | STOP_CHAR(tty) == '\023' && | |
526 | START_CHAR(tty) == '\021'); | |
26df6d13 | 527 | if ((old_flow != new_flow) || extproc) { |
04f378b1 | 528 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
26df6d13 | 529 | if (old_flow != new_flow) { |
530 | tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); | |
531 | if (new_flow) | |
532 | tty->ctrl_status |= TIOCPKT_DOSTOP; | |
533 | else | |
534 | tty->ctrl_status |= TIOCPKT_NOSTOP; | |
535 | } | |
536 | if (extproc) | |
537 | tty->ctrl_status |= TIOCPKT_IOCTL; | |
04f378b1 | 538 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
1da177e4 LT |
539 | wake_up_interruptible(&tty->link->read_wait); |
540 | } | |
541 | } | |
355d95a1 | 542 | |
f34d7a5b AC |
543 | if (tty->ops->set_termios) |
544 | (*tty->ops->set_termios)(tty, &old_termios); | |
5f519d72 AC |
545 | else |
546 | tty_termios_copy_hw(tty->termios, &old_termios); | |
1da177e4 LT |
547 | |
548 | ld = tty_ldisc_ref(tty); | |
549 | if (ld != NULL) { | |
a352def2 AC |
550 | if (ld->ops->set_termios) |
551 | (ld->ops->set_termios)(tty, &old_termios); | |
1da177e4 LT |
552 | tty_ldisc_deref(ld); |
553 | } | |
5785c95b | 554 | mutex_unlock(&tty->termios_mutex); |
8d075b19 | 555 | return 0; |
1da177e4 | 556 | } |
8d075b19 | 557 | EXPORT_SYMBOL_GPL(tty_set_termios); |
1da177e4 | 558 | |
af9b897e AC |
559 | /** |
560 | * set_termios - set termios values for a tty | |
561 | * @tty: terminal device | |
562 | * @arg: user data | |
563 | * @opt: option information | |
564 | * | |
3a4fa0a2 | 565 | * Helper function to prepare termios data and run necessary other |
8d075b19 | 566 | * functions before using tty_set_termios to do the actual changes. |
af9b897e AC |
567 | * |
568 | * Locking: | |
d81ed103 | 569 | * Called functions take ldisc and termios_mutex locks |
af9b897e AC |
570 | */ |
571 | ||
355d95a1 | 572 | static int set_termios(struct tty_struct *tty, void __user *arg, int opt) |
1da177e4 | 573 | { |
edc6afc5 | 574 | struct ktermios tmp_termios; |
1da177e4 LT |
575 | struct tty_ldisc *ld; |
576 | int retval = tty_check_change(tty); | |
577 | ||
578 | if (retval) | |
579 | return retval; | |
580 | ||
978e595f | 581 | mutex_lock(&tty->termios_mutex); |
64bb6c5e | 582 | memcpy(&tmp_termios, tty->termios, sizeof(struct ktermios)); |
978e595f | 583 | mutex_unlock(&tty->termios_mutex); |
64bb6c5e | 584 | |
1da177e4 | 585 | if (opt & TERMIOS_TERMIO) { |
1da177e4 LT |
586 | if (user_termio_to_kernel_termios(&tmp_termios, |
587 | (struct termio __user *)arg)) | |
588 | return -EFAULT; | |
edc6afc5 AC |
589 | #ifdef TCGETS2 |
590 | } else if (opt & TERMIOS_OLD) { | |
edc6afc5 | 591 | if (user_termios_to_kernel_termios_1(&tmp_termios, |
64bb6c5e | 592 | (struct termios __user *)arg)) |
edc6afc5 | 593 | return -EFAULT; |
1da177e4 LT |
594 | } else { |
595 | if (user_termios_to_kernel_termios(&tmp_termios, | |
64bb6c5e | 596 | (struct termios2 __user *)arg)) |
1da177e4 LT |
597 | return -EFAULT; |
598 | } | |
64bb6c5e AC |
599 | #else |
600 | } else if (user_termios_to_kernel_termios(&tmp_termios, | |
601 | (struct termios __user *)arg)) | |
602 | return -EFAULT; | |
603 | #endif | |
1da177e4 | 604 | |
355d95a1 AC |
605 | /* If old style Bfoo values are used then load c_ispeed/c_ospeed |
606 | * with the real speed so its unconditionally usable */ | |
edc6afc5 AC |
607 | tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios); |
608 | tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios); | |
609 | ||
1da177e4 | 610 | ld = tty_ldisc_ref(tty); |
355d95a1 | 611 | |
1da177e4 | 612 | if (ld != NULL) { |
a352def2 AC |
613 | if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer) |
614 | ld->ops->flush_buffer(tty); | |
1da177e4 LT |
615 | tty_ldisc_deref(ld); |
616 | } | |
355d95a1 | 617 | |
1da177e4 LT |
618 | if (opt & TERMIOS_WAIT) { |
619 | tty_wait_until_sent(tty, 0); | |
620 | if (signal_pending(current)) | |
621 | return -EINTR; | |
622 | } | |
623 | ||
8d075b19 | 624 | tty_set_termios(tty, &tmp_termios); |
5f519d72 AC |
625 | |
626 | /* FIXME: Arguably if tmp_termios == tty->termios AND the | |
627 | actual requested termios was not tmp_termios then we may | |
628 | want to return an error as no user requested change has | |
629 | succeeded */ | |
1da177e4 LT |
630 | return 0; |
631 | } | |
632 | ||
26a2e20f AC |
633 | static void copy_termios(struct tty_struct *tty, struct ktermios *kterm) |
634 | { | |
635 | mutex_lock(&tty->termios_mutex); | |
636 | memcpy(kterm, tty->termios, sizeof(struct ktermios)); | |
637 | mutex_unlock(&tty->termios_mutex); | |
638 | } | |
639 | ||
640 | static void copy_termios_locked(struct tty_struct *tty, struct ktermios *kterm) | |
641 | { | |
642 | mutex_lock(&tty->termios_mutex); | |
643 | memcpy(kterm, tty->termios_locked, sizeof(struct ktermios)); | |
644 | mutex_unlock(&tty->termios_mutex); | |
645 | } | |
646 | ||
355d95a1 | 647 | static int get_termio(struct tty_struct *tty, struct termio __user *termio) |
1da177e4 | 648 | { |
26a2e20f AC |
649 | struct ktermios kterm; |
650 | copy_termios(tty, &kterm); | |
651 | if (kernel_termios_to_user_termio(termio, &kterm)) | |
1da177e4 LT |
652 | return -EFAULT; |
653 | return 0; | |
654 | } | |
655 | ||
1d65b4a0 AC |
656 | |
657 | #ifdef TCGETX | |
658 | ||
659 | /** | |
660 | * set_termiox - set termiox fields if possible | |
661 | * @tty: terminal | |
662 | * @arg: termiox structure from user | |
663 | * @opt: option flags for ioctl type | |
664 | * | |
665 | * Implement the device calling points for the SYS5 termiox ioctl | |
666 | * interface in Linux | |
667 | */ | |
668 | ||
669 | static int set_termiox(struct tty_struct *tty, void __user *arg, int opt) | |
670 | { | |
671 | struct termiox tnew; | |
672 | struct tty_ldisc *ld; | |
673 | ||
674 | if (tty->termiox == NULL) | |
675 | return -EINVAL; | |
676 | if (copy_from_user(&tnew, arg, sizeof(struct termiox))) | |
677 | return -EFAULT; | |
678 | ||
679 | ld = tty_ldisc_ref(tty); | |
680 | if (ld != NULL) { | |
681 | if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer) | |
682 | ld->ops->flush_buffer(tty); | |
683 | tty_ldisc_deref(ld); | |
684 | } | |
685 | if (opt & TERMIOS_WAIT) { | |
686 | tty_wait_until_sent(tty, 0); | |
687 | if (signal_pending(current)) | |
688 | return -EINTR; | |
689 | } | |
690 | ||
691 | mutex_lock(&tty->termios_mutex); | |
692 | if (tty->ops->set_termiox) | |
693 | tty->ops->set_termiox(tty, &tnew); | |
694 | mutex_unlock(&tty->termios_mutex); | |
695 | return 0; | |
696 | } | |
697 | ||
698 | #endif | |
699 | ||
1da177e4 LT |
700 | |
701 | #ifdef TIOCGETP | |
702 | /* | |
703 | * These are deprecated, but there is limited support.. | |
704 | * | |
705 | * The "sg_flags" translation is a joke.. | |
706 | */ | |
355d95a1 | 707 | static int get_sgflags(struct tty_struct *tty) |
1da177e4 LT |
708 | { |
709 | int flags = 0; | |
710 | ||
711 | if (!(tty->termios->c_lflag & ICANON)) { | |
712 | if (tty->termios->c_lflag & ISIG) | |
713 | flags |= 0x02; /* cbreak */ | |
714 | else | |
715 | flags |= 0x20; /* raw */ | |
716 | } | |
717 | if (tty->termios->c_lflag & ECHO) | |
718 | flags |= 0x08; /* echo */ | |
719 | if (tty->termios->c_oflag & OPOST) | |
720 | if (tty->termios->c_oflag & ONLCR) | |
721 | flags |= 0x10; /* crmod */ | |
722 | return flags; | |
723 | } | |
724 | ||
355d95a1 | 725 | static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
1da177e4 LT |
726 | { |
727 | struct sgttyb tmp; | |
728 | ||
5785c95b | 729 | mutex_lock(&tty->termios_mutex); |
606d099c AC |
730 | tmp.sg_ispeed = tty->termios->c_ispeed; |
731 | tmp.sg_ospeed = tty->termios->c_ospeed; | |
1da177e4 LT |
732 | tmp.sg_erase = tty->termios->c_cc[VERASE]; |
733 | tmp.sg_kill = tty->termios->c_cc[VKILL]; | |
734 | tmp.sg_flags = get_sgflags(tty); | |
5785c95b | 735 | mutex_unlock(&tty->termios_mutex); |
355d95a1 | 736 | |
1da177e4 LT |
737 | return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
738 | } | |
739 | ||
355d95a1 | 740 | static void set_sgflags(struct ktermios *termios, int flags) |
1da177e4 LT |
741 | { |
742 | termios->c_iflag = ICRNL | IXON; | |
743 | termios->c_oflag = 0; | |
744 | termios->c_lflag = ISIG | ICANON; | |
745 | if (flags & 0x02) { /* cbreak */ | |
746 | termios->c_iflag = 0; | |
747 | termios->c_lflag &= ~ICANON; | |
748 | } | |
749 | if (flags & 0x08) { /* echo */ | |
750 | termios->c_lflag |= ECHO | ECHOE | ECHOK | | |
751 | ECHOCTL | ECHOKE | IEXTEN; | |
752 | } | |
753 | if (flags & 0x10) { /* crmod */ | |
754 | termios->c_oflag |= OPOST | ONLCR; | |
755 | } | |
756 | if (flags & 0x20) { /* raw */ | |
757 | termios->c_iflag = 0; | |
758 | termios->c_lflag &= ~(ISIG | ICANON); | |
759 | } | |
760 | if (!(termios->c_lflag & ICANON)) { | |
761 | termios->c_cc[VMIN] = 1; | |
762 | termios->c_cc[VTIME] = 0; | |
763 | } | |
764 | } | |
765 | ||
af9b897e AC |
766 | /** |
767 | * set_sgttyb - set legacy terminal values | |
768 | * @tty: tty structure | |
769 | * @sgttyb: pointer to old style terminal structure | |
770 | * | |
771 | * Updates a terminal from the legacy BSD style terminal information | |
772 | * structure. | |
773 | * | |
d81ed103 | 774 | * Locking: termios_mutex |
af9b897e AC |
775 | */ |
776 | ||
355d95a1 | 777 | static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
1da177e4 LT |
778 | { |
779 | int retval; | |
780 | struct sgttyb tmp; | |
edc6afc5 | 781 | struct ktermios termios; |
1da177e4 LT |
782 | |
783 | retval = tty_check_change(tty); | |
784 | if (retval) | |
785 | return retval; | |
355d95a1 | 786 | |
1da177e4 LT |
787 | if (copy_from_user(&tmp, sgttyb, sizeof(tmp))) |
788 | return -EFAULT; | |
789 | ||
5785c95b | 790 | mutex_lock(&tty->termios_mutex); |
6804396f | 791 | termios = *tty->termios; |
1da177e4 LT |
792 | termios.c_cc[VERASE] = tmp.sg_erase; |
793 | termios.c_cc[VKILL] = tmp.sg_kill; | |
794 | set_sgflags(&termios, tmp.sg_flags); | |
edc6afc5 AC |
795 | /* Try and encode into Bfoo format */ |
796 | #ifdef BOTHER | |
355d95a1 AC |
797 | tty_termios_encode_baud_rate(&termios, termios.c_ispeed, |
798 | termios.c_ospeed); | |
edc6afc5 | 799 | #endif |
5785c95b | 800 | mutex_unlock(&tty->termios_mutex); |
8d075b19 | 801 | tty_set_termios(tty, &termios); |
1da177e4 LT |
802 | return 0; |
803 | } | |
804 | #endif | |
805 | ||
806 | #ifdef TIOCGETC | |
355d95a1 | 807 | static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
1da177e4 LT |
808 | { |
809 | struct tchars tmp; | |
810 | ||
978e595f | 811 | mutex_lock(&tty->termios_mutex); |
1da177e4 LT |
812 | tmp.t_intrc = tty->termios->c_cc[VINTR]; |
813 | tmp.t_quitc = tty->termios->c_cc[VQUIT]; | |
814 | tmp.t_startc = tty->termios->c_cc[VSTART]; | |
815 | tmp.t_stopc = tty->termios->c_cc[VSTOP]; | |
816 | tmp.t_eofc = tty->termios->c_cc[VEOF]; | |
817 | tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */ | |
978e595f | 818 | mutex_unlock(&tty->termios_mutex); |
1da177e4 LT |
819 | return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
820 | } | |
821 | ||
355d95a1 | 822 | static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
1da177e4 LT |
823 | { |
824 | struct tchars tmp; | |
825 | ||
826 | if (copy_from_user(&tmp, tchars, sizeof(tmp))) | |
827 | return -EFAULT; | |
978e595f | 828 | mutex_lock(&tty->termios_mutex); |
1da177e4 LT |
829 | tty->termios->c_cc[VINTR] = tmp.t_intrc; |
830 | tty->termios->c_cc[VQUIT] = tmp.t_quitc; | |
831 | tty->termios->c_cc[VSTART] = tmp.t_startc; | |
832 | tty->termios->c_cc[VSTOP] = tmp.t_stopc; | |
833 | tty->termios->c_cc[VEOF] = tmp.t_eofc; | |
834 | tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */ | |
978e595f | 835 | mutex_unlock(&tty->termios_mutex); |
1da177e4 LT |
836 | return 0; |
837 | } | |
838 | #endif | |
839 | ||
840 | #ifdef TIOCGLTC | |
355d95a1 | 841 | static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
1da177e4 LT |
842 | { |
843 | struct ltchars tmp; | |
844 | ||
978e595f | 845 | mutex_lock(&tty->termios_mutex); |
1da177e4 | 846 | tmp.t_suspc = tty->termios->c_cc[VSUSP]; |
355d95a1 AC |
847 | /* what is dsuspc anyway? */ |
848 | tmp.t_dsuspc = tty->termios->c_cc[VSUSP]; | |
1da177e4 | 849 | tmp.t_rprntc = tty->termios->c_cc[VREPRINT]; |
355d95a1 AC |
850 | /* what is flushc anyway? */ |
851 | tmp.t_flushc = tty->termios->c_cc[VEOL2]; | |
1da177e4 LT |
852 | tmp.t_werasc = tty->termios->c_cc[VWERASE]; |
853 | tmp.t_lnextc = tty->termios->c_cc[VLNEXT]; | |
978e595f | 854 | mutex_unlock(&tty->termios_mutex); |
1da177e4 LT |
855 | return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
856 | } | |
857 | ||
355d95a1 | 858 | static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
1da177e4 LT |
859 | { |
860 | struct ltchars tmp; | |
861 | ||
862 | if (copy_from_user(&tmp, ltchars, sizeof(tmp))) | |
863 | return -EFAULT; | |
864 | ||
978e595f | 865 | mutex_lock(&tty->termios_mutex); |
1da177e4 | 866 | tty->termios->c_cc[VSUSP] = tmp.t_suspc; |
355d95a1 AC |
867 | /* what is dsuspc anyway? */ |
868 | tty->termios->c_cc[VEOL2] = tmp.t_dsuspc; | |
1da177e4 | 869 | tty->termios->c_cc[VREPRINT] = tmp.t_rprntc; |
355d95a1 AC |
870 | /* what is flushc anyway? */ |
871 | tty->termios->c_cc[VEOL2] = tmp.t_flushc; | |
1da177e4 LT |
872 | tty->termios->c_cc[VWERASE] = tmp.t_werasc; |
873 | tty->termios->c_cc[VLNEXT] = tmp.t_lnextc; | |
978e595f | 874 | mutex_unlock(&tty->termios_mutex); |
1da177e4 LT |
875 | return 0; |
876 | } | |
877 | #endif | |
878 | ||
af9b897e AC |
879 | /** |
880 | * send_prio_char - send priority character | |
881 | * | |
882 | * Send a high priority character to the tty even if stopped | |
883 | * | |
5f412b24 | 884 | * Locking: none for xchar method, write ordering for write method. |
1da177e4 | 885 | */ |
af9b897e | 886 | |
5f412b24 | 887 | static int send_prio_char(struct tty_struct *tty, char ch) |
1da177e4 LT |
888 | { |
889 | int was_stopped = tty->stopped; | |
890 | ||
f34d7a5b AC |
891 | if (tty->ops->send_xchar) { |
892 | tty->ops->send_xchar(tty, ch); | |
5f412b24 | 893 | return 0; |
1da177e4 | 894 | } |
5f412b24 | 895 | |
9c1729db | 896 | if (tty_write_lock(tty, 0) < 0) |
5f412b24 AC |
897 | return -ERESTARTSYS; |
898 | ||
1da177e4 LT |
899 | if (was_stopped) |
900 | start_tty(tty); | |
f34d7a5b | 901 | tty->ops->write(tty, &ch, 1); |
1da177e4 LT |
902 | if (was_stopped) |
903 | stop_tty(tty); | |
9c1729db | 904 | tty_write_unlock(tty); |
5f412b24 | 905 | return 0; |
1da177e4 LT |
906 | } |
907 | ||
1c2630cc AC |
908 | /** |
909 | * tty_change_softcar - carrier change ioctl helper | |
910 | * @tty: tty to update | |
911 | * @arg: enable/disable CLOCAL | |
912 | * | |
913 | * Perform a change to the CLOCAL state and call into the driver | |
914 | * layer to make it visible. All done with the termios mutex | |
915 | */ | |
916 | ||
917 | static int tty_change_softcar(struct tty_struct *tty, int arg) | |
918 | { | |
919 | int ret = 0; | |
920 | int bit = arg ? CLOCAL : 0; | |
f34d7a5b | 921 | struct ktermios old; |
1c2630cc AC |
922 | |
923 | mutex_lock(&tty->termios_mutex); | |
f34d7a5b | 924 | old = *tty->termios; |
1c2630cc AC |
925 | tty->termios->c_cflag &= ~CLOCAL; |
926 | tty->termios->c_cflag |= bit; | |
f34d7a5b AC |
927 | if (tty->ops->set_termios) |
928 | tty->ops->set_termios(tty, &old); | |
1c2630cc AC |
929 | if ((tty->termios->c_cflag & CLOCAL) != bit) |
930 | ret = -EINVAL; | |
931 | mutex_unlock(&tty->termios_mutex); | |
932 | return ret; | |
933 | } | |
934 | ||
0fc00e24 AC |
935 | /** |
936 | * tty_mode_ioctl - mode related ioctls | |
937 | * @tty: tty for the ioctl | |
938 | * @file: file pointer for the tty | |
939 | * @cmd: command | |
940 | * @arg: ioctl argument | |
941 | * | |
942 | * Perform non line discipline specific mode control ioctls. This | |
943 | * is designed to be called by line disciplines to ensure they provide | |
944 | * consistent mode setting. | |
945 | */ | |
946 | ||
355d95a1 | 947 | int tty_mode_ioctl(struct tty_struct *tty, struct file *file, |
0fc00e24 | 948 | unsigned int cmd, unsigned long arg) |
1da177e4 | 949 | { |
355d95a1 | 950 | struct tty_struct *real_tty; |
1da177e4 | 951 | void __user *p = (void __user *)arg; |
8f520021 | 952 | int ret = 0; |
26a2e20f | 953 | struct ktermios kterm; |
1da177e4 | 954 | |
8d075b19 AC |
955 | BUG_ON(file == NULL); |
956 | ||
1da177e4 LT |
957 | if (tty->driver->type == TTY_DRIVER_TYPE_PTY && |
958 | tty->driver->subtype == PTY_TYPE_MASTER) | |
959 | real_tty = tty->link; | |
960 | else | |
961 | real_tty = tty; | |
962 | ||
963 | switch (cmd) { | |
964 | #ifdef TIOCGETP | |
355d95a1 AC |
965 | case TIOCGETP: |
966 | return get_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
967 | case TIOCSETP: | |
968 | case TIOCSETN: | |
969 | return set_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
1da177e4 LT |
970 | #endif |
971 | #ifdef TIOCGETC | |
355d95a1 AC |
972 | case TIOCGETC: |
973 | return get_tchars(real_tty, p); | |
974 | case TIOCSETC: | |
975 | return set_tchars(real_tty, p); | |
1da177e4 LT |
976 | #endif |
977 | #ifdef TIOCGLTC | |
355d95a1 AC |
978 | case TIOCGLTC: |
979 | return get_ltchars(real_tty, p); | |
980 | case TIOCSLTC: | |
981 | return set_ltchars(real_tty, p); | |
1da177e4 | 982 | #endif |
355d95a1 AC |
983 | case TCSETSF: |
984 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD); | |
985 | case TCSETSW: | |
986 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD); | |
987 | case TCSETS: | |
988 | return set_termios(real_tty, p, TERMIOS_OLD); | |
edc6afc5 | 989 | #ifndef TCGETS2 |
355d95a1 | 990 | case TCGETS: |
26a2e20f AC |
991 | copy_termios(real_tty, &kterm); |
992 | if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm)) | |
8f520021 | 993 | ret = -EFAULT; |
8f520021 | 994 | return ret; |
edc6afc5 | 995 | #else |
355d95a1 | 996 | case TCGETS: |
26a2e20f AC |
997 | copy_termios(real_tty, &kterm); |
998 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm)) | |
8f520021 | 999 | ret = -EFAULT; |
8f520021 | 1000 | return ret; |
355d95a1 | 1001 | case TCGETS2: |
26a2e20f AC |
1002 | copy_termios(real_tty, &kterm); |
1003 | if (kernel_termios_to_user_termios((struct termios2 __user *)arg, &kterm)) | |
8f520021 | 1004 | ret = -EFAULT; |
8f520021 | 1005 | return ret; |
355d95a1 AC |
1006 | case TCSETSF2: |
1007 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT); | |
1008 | case TCSETSW2: | |
1009 | return set_termios(real_tty, p, TERMIOS_WAIT); | |
1010 | case TCSETS2: | |
1011 | return set_termios(real_tty, p, 0); | |
edc6afc5 | 1012 | #endif |
355d95a1 AC |
1013 | case TCGETA: |
1014 | return get_termio(real_tty, p); | |
1015 | case TCSETAF: | |
1016 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO); | |
1017 | case TCSETAW: | |
1018 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO); | |
1019 | case TCSETA: | |
1020 | return set_termios(real_tty, p, TERMIOS_TERMIO); | |
0fc00e24 | 1021 | #ifndef TCGETS2 |
355d95a1 | 1022 | case TIOCGLCKTRMIOS: |
26a2e20f AC |
1023 | copy_termios_locked(real_tty, &kterm); |
1024 | if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm)) | |
8f520021 | 1025 | ret = -EFAULT; |
8f520021 | 1026 | return ret; |
355d95a1 AC |
1027 | case TIOCSLCKTRMIOS: |
1028 | if (!capable(CAP_SYS_ADMIN)) | |
1029 | return -EPERM; | |
26a2e20f AC |
1030 | copy_termios_locked(real_tty, &kterm); |
1031 | if (user_termios_to_kernel_termios(&kterm, | |
355d95a1 | 1032 | (struct termios __user *) arg)) |
26a2e20f AC |
1033 | return -EFAULT; |
1034 | mutex_lock(&real_tty->termios_mutex); | |
1035 | memcpy(real_tty->termios_locked, &kterm, sizeof(struct ktermios)); | |
8f520021 | 1036 | mutex_unlock(&real_tty->termios_mutex); |
26a2e20f | 1037 | return 0; |
0fc00e24 | 1038 | #else |
355d95a1 | 1039 | case TIOCGLCKTRMIOS: |
26a2e20f AC |
1040 | copy_termios_locked(real_tty, &kterm); |
1041 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm)) | |
8f520021 | 1042 | ret = -EFAULT; |
8f520021 | 1043 | return ret; |
355d95a1 AC |
1044 | case TIOCSLCKTRMIOS: |
1045 | if (!capable(CAP_SYS_ADMIN)) | |
26a2e20f AC |
1046 | return -EPERM; |
1047 | copy_termios_locked(real_tty, &kterm); | |
1048 | if (user_termios_to_kernel_termios_1(&kterm, | |
355d95a1 | 1049 | (struct termios __user *) arg)) |
26a2e20f AC |
1050 | return -EFAULT; |
1051 | mutex_lock(&real_tty->termios_mutex); | |
1052 | memcpy(real_tty->termios_locked, &kterm, sizeof(struct ktermios)); | |
8f520021 AC |
1053 | mutex_unlock(&real_tty->termios_mutex); |
1054 | return ret; | |
0fc00e24 | 1055 | #endif |
1d65b4a0 | 1056 | #ifdef TCGETX |
5dca607b MF |
1057 | case TCGETX: { |
1058 | struct termiox ktermx; | |
1d65b4a0 AC |
1059 | if (real_tty->termiox == NULL) |
1060 | return -EINVAL; | |
8f520021 | 1061 | mutex_lock(&real_tty->termios_mutex); |
26a2e20f | 1062 | memcpy(&ktermx, real_tty->termiox, sizeof(struct termiox)); |
8f520021 | 1063 | mutex_unlock(&real_tty->termios_mutex); |
26a2e20f AC |
1064 | if (copy_to_user(p, &ktermx, sizeof(struct termiox))) |
1065 | ret = -EFAULT; | |
8f520021 | 1066 | return ret; |
5dca607b | 1067 | } |
1d65b4a0 AC |
1068 | case TCSETX: |
1069 | return set_termiox(real_tty, p, 0); | |
1070 | case TCSETXW: | |
1071 | return set_termiox(real_tty, p, TERMIOS_WAIT); | |
1072 | case TCSETXF: | |
1073 | return set_termiox(real_tty, p, TERMIOS_FLUSH); | |
1074 | #endif | |
355d95a1 | 1075 | case TIOCGSOFTCAR: |
26a2e20f AC |
1076 | copy_termios(real_tty, &kterm); |
1077 | ret = put_user((kterm.c_cflag & CLOCAL) ? 1 : 0, | |
355d95a1 | 1078 | (int __user *)arg); |
8f520021 | 1079 | return ret; |
355d95a1 AC |
1080 | case TIOCSSOFTCAR: |
1081 | if (get_user(arg, (unsigned int __user *) arg)) | |
1082 | return -EFAULT; | |
f753f327 | 1083 | return tty_change_softcar(real_tty, arg); |
355d95a1 AC |
1084 | default: |
1085 | return -ENOIOCTLCMD; | |
0fc00e24 AC |
1086 | } |
1087 | } | |
0fc00e24 AC |
1088 | EXPORT_SYMBOL_GPL(tty_mode_ioctl); |
1089 | ||
1090 | int tty_perform_flush(struct tty_struct *tty, unsigned long arg) | |
1091 | { | |
1092 | struct tty_ldisc *ld; | |
1093 | int retval = tty_check_change(tty); | |
1094 | if (retval) | |
1095 | return retval; | |
1096 | ||
c0253eec | 1097 | ld = tty_ldisc_ref_wait(tty); |
0fc00e24 AC |
1098 | switch (arg) { |
1099 | case TCIFLUSH: | |
a352def2 AC |
1100 | if (ld && ld->ops->flush_buffer) |
1101 | ld->ops->flush_buffer(tty); | |
0fc00e24 AC |
1102 | break; |
1103 | case TCIOFLUSH: | |
a352def2 AC |
1104 | if (ld && ld->ops->flush_buffer) |
1105 | ld->ops->flush_buffer(tty); | |
0fc00e24 AC |
1106 | /* fall through */ |
1107 | case TCOFLUSH: | |
f34d7a5b | 1108 | tty_driver_flush_buffer(tty); |
0fc00e24 AC |
1109 | break; |
1110 | default: | |
1111 | tty_ldisc_deref(ld); | |
1112 | return -EINVAL; | |
1113 | } | |
1114 | tty_ldisc_deref(ld); | |
1115 | return 0; | |
1116 | } | |
0fc00e24 AC |
1117 | EXPORT_SYMBOL_GPL(tty_perform_flush); |
1118 | ||
47afa7a5 | 1119 | int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, |
0fc00e24 AC |
1120 | unsigned int cmd, unsigned long arg) |
1121 | { | |
04f378b1 | 1122 | unsigned long flags; |
0fc00e24 AC |
1123 | int retval; |
1124 | ||
0fc00e24 | 1125 | switch (cmd) { |
355d95a1 AC |
1126 | case TCXONC: |
1127 | retval = tty_check_change(tty); | |
1128 | if (retval) | |
1129 | return retval; | |
1130 | switch (arg) { | |
1131 | case TCOOFF: | |
1132 | if (!tty->flow_stopped) { | |
1133 | tty->flow_stopped = 1; | |
1134 | stop_tty(tty); | |
1da177e4 | 1135 | } |
355d95a1 AC |
1136 | break; |
1137 | case TCOON: | |
1138 | if (tty->flow_stopped) { | |
1139 | tty->flow_stopped = 0; | |
1140 | start_tty(tty); | |
1141 | } | |
1142 | break; | |
1143 | case TCIOFF: | |
1144 | if (STOP_CHAR(tty) != __DISABLED_CHAR) | |
1145 | return send_prio_char(tty, STOP_CHAR(tty)); | |
1146 | break; | |
1147 | case TCION: | |
1148 | if (START_CHAR(tty) != __DISABLED_CHAR) | |
1149 | return send_prio_char(tty, START_CHAR(tty)); | |
1150 | break; | |
1da177e4 | 1151 | default: |
355d95a1 | 1152 | return -EINVAL; |
1da177e4 | 1153 | } |
355d95a1 AC |
1154 | return 0; |
1155 | case TCFLSH: | |
1156 | return tty_perform_flush(tty, arg); | |
355d95a1 AC |
1157 | case TIOCPKT: |
1158 | { | |
1159 | int pktmode; | |
1160 | ||
1161 | if (tty->driver->type != TTY_DRIVER_TYPE_PTY || | |
1162 | tty->driver->subtype != PTY_TYPE_MASTER) | |
1163 | return -ENOTTY; | |
1164 | if (get_user(pktmode, (int __user *) arg)) | |
1165 | return -EFAULT; | |
04f378b1 | 1166 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
355d95a1 AC |
1167 | if (pktmode) { |
1168 | if (!tty->packet) { | |
1169 | tty->packet = 1; | |
1170 | tty->link->ctrl_status = 0; | |
1171 | } | |
1172 | } else | |
1173 | tty->packet = 0; | |
04f378b1 | 1174 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
355d95a1 AC |
1175 | return 0; |
1176 | } | |
1177 | default: | |
1178 | /* Try the mode commands */ | |
1179 | return tty_mode_ioctl(tty, file, cmd, arg); | |
1180 | } | |
1da177e4 | 1181 | } |
47afa7a5 | 1182 | EXPORT_SYMBOL(n_tty_ioctl_helper); |
8193c429 TM |
1183 | |
1184 | #ifdef CONFIG_COMPAT | |
1185 | long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file, | |
1186 | unsigned int cmd, unsigned long arg) | |
1187 | { | |
1188 | switch (cmd) { | |
1189 | case TIOCGLCKTRMIOS: | |
1190 | case TIOCSLCKTRMIOS: | |
1191 | return tty_mode_ioctl(tty, file, cmd, (unsigned long) compat_ptr(arg)); | |
1192 | default: | |
1193 | return -ENOIOCTLCMD; | |
1194 | } | |
1195 | } | |
1196 | EXPORT_SYMBOL(n_tty_compat_ioctl_helper); | |
1197 | #endif | |
1198 |