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