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