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