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