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e3b3d0f5 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
4 | * | |
5 | * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines | |
6 | * which can be dynamically activated and de-activated by the line | |
7 | * discipline handling modules (like SLIP). | |
8 | */ | |
9 | ||
10 | #include <linux/types.h> | |
11 | #include <linux/termios.h> | |
12 | #include <linux/errno.h> | |
174cd4b1 | 13 | #include <linux/sched/signal.h> |
1da177e4 LT |
14 | #include <linux/kernel.h> |
15 | #include <linux/major.h> | |
16 | #include <linux/tty.h> | |
17 | #include <linux/fcntl.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/bitops.h> | |
5785c95b | 22 | #include <linux/mutex.h> |
8193c429 | 23 | #include <linux/compat.h> |
c9874d3f | 24 | #include <linux/termios_internal.h> |
9f72cab1 | 25 | #include "tty.h" |
1da177e4 LT |
26 | |
27 | #include <asm/io.h> | |
7c0f6ba6 | 28 | #include <linux/uaccess.h> |
1da177e4 LT |
29 | |
30 | #undef TTY_DEBUG_WAIT_UNTIL_SENT | |
31 | ||
ff8339dc PH |
32 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT |
33 | # define tty_debug_wait_until_sent(tty, f, args...) tty_debug(tty, f, ##args) | |
34 | #else | |
35 | # define tty_debug_wait_until_sent(tty, f, args...) do {} while (0) | |
36 | #endif | |
37 | ||
1da177e4 LT |
38 | #undef DEBUG |
39 | ||
40 | /* | |
41 | * Internal flag options for termios setting behavior | |
42 | */ | |
43 | #define TERMIOS_FLUSH 1 | |
44 | #define TERMIOS_WAIT 2 | |
45 | #define TERMIOS_TERMIO 4 | |
edc6afc5 | 46 | #define TERMIOS_OLD 8 |
1da177e4 | 47 | |
af9b897e | 48 | |
d81ed103 AC |
49 | /** |
50 | * tty_chars_in_buffer - characters pending | |
51 | * @tty: terminal | |
52 | * | |
53 | * Return the number of bytes of data in the device private | |
54 | * output queue. If no private method is supplied there is assumed | |
55 | * to be no queue on the device. | |
56 | */ | |
57 | ||
fff4ef17 | 58 | unsigned int tty_chars_in_buffer(struct tty_struct *tty) |
f34d7a5b AC |
59 | { |
60 | if (tty->ops->chars_in_buffer) | |
61 | return tty->ops->chars_in_buffer(tty); | |
ab78b0c9 | 62 | return 0; |
f34d7a5b | 63 | } |
f34d7a5b AC |
64 | EXPORT_SYMBOL(tty_chars_in_buffer); |
65 | ||
d81ed103 AC |
66 | /** |
67 | * tty_write_room - write queue space | |
68 | * @tty: terminal | |
69 | * | |
70 | * Return the number of bytes that can be queued to this device | |
71 | * at the present time. The result should be treated as a guarantee | |
72 | * and the driver cannot offer a value it later shrinks by more than | |
73 | * the number of bytes written. If no method is provided 2K is always | |
74 | * returned and data may be lost as there will be no flow control. | |
75 | */ | |
76 | ||
03b3b1a2 | 77 | unsigned int tty_write_room(struct tty_struct *tty) |
f34d7a5b AC |
78 | { |
79 | if (tty->ops->write_room) | |
80 | return tty->ops->write_room(tty); | |
81 | return 2048; | |
82 | } | |
f34d7a5b AC |
83 | EXPORT_SYMBOL(tty_write_room); |
84 | ||
d81ed103 AC |
85 | /** |
86 | * tty_driver_flush_buffer - discard internal buffer | |
87 | * @tty: terminal | |
88 | * | |
89 | * Discard the internal output buffer for this device. If no method | |
90 | * is provided then either the buffer cannot be hardware flushed or | |
91 | * there is no buffer driver side. | |
92 | */ | |
f34d7a5b AC |
93 | void tty_driver_flush_buffer(struct tty_struct *tty) |
94 | { | |
95 | if (tty->ops->flush_buffer) | |
96 | tty->ops->flush_buffer(tty); | |
97 | } | |
f34d7a5b AC |
98 | EXPORT_SYMBOL(tty_driver_flush_buffer); |
99 | ||
d81ed103 AC |
100 | /** |
101 | * tty_unthrottle - flow control | |
102 | * @tty: terminal | |
103 | * | |
104 | * Indicate that a tty may continue transmitting data down the stack. | |
6a1c0680 | 105 | * Takes the termios rwsem to protect against parallel throttle/unthrottle |
38db8979 AC |
106 | * and also to ensure the driver can consistently reference its own |
107 | * termios data at this point when implementing software flow control. | |
108 | * | |
109 | * Drivers should however remember that the stack can issue a throttle, | |
110 | * then change flow control method, then unthrottle. | |
d81ed103 AC |
111 | */ |
112 | ||
39c2e60f AC |
113 | void tty_unthrottle(struct tty_struct *tty) |
114 | { | |
6a1c0680 | 115 | down_write(&tty->termios_rwsem); |
39c2e60f AC |
116 | if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) && |
117 | tty->ops->unthrottle) | |
118 | tty->ops->unthrottle(tty); | |
70bc1264 | 119 | tty->flow_change = 0; |
6a1c0680 | 120 | up_write(&tty->termios_rwsem); |
39c2e60f AC |
121 | } |
122 | EXPORT_SYMBOL(tty_unthrottle); | |
f34d7a5b | 123 | |
70bc1264 PH |
124 | /** |
125 | * tty_throttle_safe - flow control | |
126 | * @tty: terminal | |
127 | * | |
76af233d JS |
128 | * Indicate that a tty should stop transmitting data down the stack. |
129 | * tty_throttle_safe will only attempt throttle if tty->flow_change is | |
130 | * TTY_THROTTLE_SAFE. Prevents an accidental throttle due to race | |
131 | * conditions when throttling is conditional on factors evaluated prior to | |
132 | * throttling. | |
70bc1264 PH |
133 | * |
134 | * Returns 0 if tty is throttled (or was already throttled) | |
135 | */ | |
136 | ||
137 | int tty_throttle_safe(struct tty_struct *tty) | |
138 | { | |
139 | int ret = 0; | |
140 | ||
d8c1f929 | 141 | mutex_lock(&tty->throttle_mutex); |
97ef38b8 | 142 | if (!tty_throttled(tty)) { |
70bc1264 PH |
143 | if (tty->flow_change != TTY_THROTTLE_SAFE) |
144 | ret = 1; | |
145 | else { | |
579a00a5 | 146 | set_bit(TTY_THROTTLED, &tty->flags); |
70bc1264 PH |
147 | if (tty->ops->throttle) |
148 | tty->ops->throttle(tty); | |
149 | } | |
150 | } | |
d8c1f929 | 151 | mutex_unlock(&tty->throttle_mutex); |
70bc1264 PH |
152 | |
153 | return ret; | |
154 | } | |
155 | ||
156 | /** | |
157 | * tty_unthrottle_safe - flow control | |
158 | * @tty: terminal | |
159 | * | |
160 | * Similar to tty_unthrottle() but will only attempt unthrottle | |
161 | * if tty->flow_change is TTY_UNTHROTTLE_SAFE. Prevents an accidental | |
162 | * unthrottle due to race conditions when unthrottling is conditional | |
163 | * on factors evaluated prior to unthrottling. | |
164 | * | |
165 | * Returns 0 if tty is unthrottled (or was already unthrottled) | |
166 | */ | |
167 | ||
168 | int tty_unthrottle_safe(struct tty_struct *tty) | |
169 | { | |
170 | int ret = 0; | |
171 | ||
d8c1f929 | 172 | mutex_lock(&tty->throttle_mutex); |
97ef38b8 | 173 | if (tty_throttled(tty)) { |
70bc1264 PH |
174 | if (tty->flow_change != TTY_UNTHROTTLE_SAFE) |
175 | ret = 1; | |
176 | else { | |
579a00a5 | 177 | clear_bit(TTY_THROTTLED, &tty->flags); |
70bc1264 PH |
178 | if (tty->ops->unthrottle) |
179 | tty->ops->unthrottle(tty); | |
180 | } | |
181 | } | |
d8c1f929 | 182 | mutex_unlock(&tty->throttle_mutex); |
70bc1264 PH |
183 | |
184 | return ret; | |
185 | } | |
186 | ||
af9b897e AC |
187 | /** |
188 | * tty_wait_until_sent - wait for I/O to finish | |
189 | * @tty: tty we are waiting for | |
190 | * @timeout: how long we will wait | |
191 | * | |
192 | * Wait for characters pending in a tty driver to hit the wire, or | |
193 | * for a timeout to occur (eg due to flow control) | |
194 | * | |
195 | * Locking: none | |
196 | */ | |
197 | ||
355d95a1 | 198 | void tty_wait_until_sent(struct tty_struct *tty, long timeout) |
1da177e4 | 199 | { |
d435cefe | 200 | tty_debug_wait_until_sent(tty, "wait until sent, timeout=%ld\n", timeout); |
ff8339dc | 201 | |
1da177e4 LT |
202 | if (!timeout) |
203 | timeout = MAX_SCHEDULE_TIMEOUT; | |
79fbf4a5 | 204 | |
c37bc682 JH |
205 | timeout = wait_event_interruptible_timeout(tty->write_wait, |
206 | !tty_chars_in_buffer(tty), timeout); | |
207 | if (timeout <= 0) | |
79fbf4a5 | 208 | return; |
79fbf4a5 JH |
209 | |
210 | if (timeout == MAX_SCHEDULE_TIMEOUT) | |
211 | timeout = 0; | |
212 | ||
213 | if (tty->ops->wait_until_sent) | |
214 | tty->ops->wait_until_sent(tty, timeout); | |
1da177e4 | 215 | } |
1da177e4 LT |
216 | EXPORT_SYMBOL(tty_wait_until_sent); |
217 | ||
d81ed103 AC |
218 | |
219 | /* | |
220 | * Termios Helper Methods | |
221 | */ | |
222 | ||
bec5b814 | 223 | static void unset_locked_termios(struct tty_struct *tty, const struct ktermios *old) |
1da177e4 | 224 | { |
d97ba9cd PH |
225 | struct ktermios *termios = &tty->termios; |
226 | struct ktermios *locked = &tty->termios_locked; | |
1da177e4 | 227 | int i; |
355d95a1 AC |
228 | |
229 | #define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z))) | |
1da177e4 | 230 | |
1da177e4 LT |
231 | NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag); |
232 | NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag); | |
233 | NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag); | |
234 | NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag); | |
235 | termios->c_line = locked->c_line ? old->c_line : termios->c_line; | |
355d95a1 | 236 | for (i = 0; i < NCCS; i++) |
1da177e4 LT |
237 | termios->c_cc[i] = locked->c_cc[i] ? |
238 | old->c_cc[i] : termios->c_cc[i]; | |
edc6afc5 | 239 | /* FIXME: What should we do for i/ospeed */ |
1da177e4 LT |
240 | } |
241 | ||
5f519d72 AC |
242 | /** |
243 | * tty_termios_copy_hw - copy hardware settings | |
244 | * @new: New termios | |
245 | * @old: Old termios | |
246 | * | |
25985edc | 247 | * Propagate the hardware specific terminal setting bits from |
5f519d72 AC |
248 | * the old termios structure to the new one. This is used in cases |
249 | * where the hardware does not support reconfiguration or as a helper | |
250 | * in some cases where only minimal reconfiguration is supported | |
251 | */ | |
252 | ||
d15f89d9 | 253 | void tty_termios_copy_hw(struct ktermios *new, const struct ktermios *old) |
5f519d72 AC |
254 | { |
255 | /* The bits a dumb device handles in software. Smart devices need | |
256 | to always provide a set_termios method */ | |
257 | new->c_cflag &= HUPCL | CREAD | CLOCAL; | |
258 | new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL); | |
259 | new->c_ispeed = old->c_ispeed; | |
260 | new->c_ospeed = old->c_ospeed; | |
261 | } | |
5f519d72 AC |
262 | EXPORT_SYMBOL(tty_termios_copy_hw); |
263 | ||
bf5e5834 AC |
264 | /** |
265 | * tty_termios_hw_change - check for setting change | |
266 | * @a: termios | |
267 | * @b: termios to compare | |
268 | * | |
269 | * Check if any of the bits that affect a dumb device have changed | |
270 | * between the two termios structures, or a speed change is needed. | |
271 | */ | |
272 | ||
87f22db4 | 273 | bool tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b) |
bf5e5834 AC |
274 | { |
275 | if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed) | |
87f22db4 | 276 | return true; |
bf5e5834 | 277 | if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL)) |
87f22db4 IJ |
278 | return true; |
279 | return false; | |
bf5e5834 AC |
280 | } |
281 | EXPORT_SYMBOL(tty_termios_hw_change); | |
282 | ||
654ee49b JS |
283 | /** |
284 | * tty_get_char_size - get size of a character | |
285 | * @cflag: termios cflag value | |
286 | * | |
287 | * Get the size (in bits) of a character depending on @cflag's %CSIZE | |
288 | * setting. | |
289 | */ | |
290 | unsigned char tty_get_char_size(unsigned int cflag) | |
291 | { | |
292 | switch (cflag & CSIZE) { | |
293 | case CS5: | |
294 | return 5; | |
295 | case CS6: | |
296 | return 6; | |
297 | case CS7: | |
298 | return 7; | |
299 | case CS8: | |
300 | default: | |
301 | return 8; | |
302 | } | |
303 | } | |
304 | EXPORT_SYMBOL_GPL(tty_get_char_size); | |
305 | ||
306 | /** | |
307 | * tty_get_frame_size - get size of a frame | |
308 | * @cflag: termios cflag value | |
309 | * | |
310 | * Get the size (in bits) of a frame depending on @cflag's %CSIZE, %CSTOPB, | |
311 | * and %PARENB setting. The result is a sum of character size, start and | |
312 | * stop bits -- one bit each -- second stop bit (if set), and parity bit | |
313 | * (if set). | |
314 | */ | |
315 | unsigned char tty_get_frame_size(unsigned int cflag) | |
316 | { | |
317 | unsigned char bits = 2 + tty_get_char_size(cflag); | |
318 | ||
319 | if (cflag & CSTOPB) | |
320 | bits++; | |
321 | if (cflag & PARENB) | |
322 | bits++; | |
4f768e94 IJ |
323 | if (cflag & ADDRB) |
324 | bits++; | |
654ee49b JS |
325 | |
326 | return bits; | |
327 | } | |
328 | EXPORT_SYMBOL_GPL(tty_get_frame_size); | |
329 | ||
af9b897e | 330 | /** |
8d075b19 | 331 | * tty_set_termios - update termios values |
af9b897e AC |
332 | * @tty: tty to update |
333 | * @new_termios: desired new value | |
334 | * | |
dbfcd851 | 335 | * Perform updates to the termios values set on this terminal. |
6460fbbf PH |
336 | * A master pty's termios should never be set. |
337 | * | |
6a1c0680 | 338 | * Locking: termios_rwsem |
af9b897e AC |
339 | */ |
340 | ||
b00f5c2d | 341 | int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios) |
1da177e4 | 342 | { |
978e595f | 343 | struct ktermios old_termios; |
1da177e4 | 344 | struct tty_ldisc *ld; |
355d95a1 | 345 | |
6460fbbf PH |
346 | WARN_ON(tty->driver->type == TTY_DRIVER_TYPE_PTY && |
347 | tty->driver->subtype == PTY_TYPE_MASTER); | |
1da177e4 LT |
348 | /* |
349 | * Perform the actual termios internal changes under lock. | |
350 | */ | |
355d95a1 | 351 | |
1da177e4 LT |
352 | |
353 | /* FIXME: we need to decide on some locking/ordering semantics | |
354 | for the set_termios notification eventually */ | |
6a1c0680 | 355 | down_write(&tty->termios_rwsem); |
adc8d746 AC |
356 | old_termios = tty->termios; |
357 | tty->termios = *new_termios; | |
d97ba9cd | 358 | unset_locked_termios(tty, &old_termios); |
4f768e94 IJ |
359 | /* Reset any ADDRB changes, ADDRB is changed through ->rs485_config() */ |
360 | tty->termios.c_cflag ^= (tty->termios.c_cflag ^ old_termios.c_cflag) & ADDRB; | |
1da177e4 | 361 | |
f34d7a5b | 362 | if (tty->ops->set_termios) |
c961bfb1 | 363 | tty->ops->set_termios(tty, &old_termios); |
5f519d72 | 364 | else |
adc8d746 | 365 | tty_termios_copy_hw(&tty->termios, &old_termios); |
1da177e4 LT |
366 | |
367 | ld = tty_ldisc_ref(tty); | |
368 | if (ld != NULL) { | |
a352def2 | 369 | if (ld->ops->set_termios) |
c961bfb1 | 370 | ld->ops->set_termios(tty, &old_termios); |
1da177e4 LT |
371 | tty_ldisc_deref(ld); |
372 | } | |
6a1c0680 | 373 | up_write(&tty->termios_rwsem); |
8d075b19 | 374 | return 0; |
1da177e4 | 375 | } |
b00f5c2d | 376 | EXPORT_SYMBOL_GPL(tty_set_termios); |
1da177e4 | 377 | |
1d5d6682 AV |
378 | |
379 | /* | |
380 | * Translate a "termio" structure into a "termios". Ugh. | |
381 | */ | |
382 | __weak int user_termio_to_kernel_termios(struct ktermios *termios, | |
383 | struct termio __user *termio) | |
384 | { | |
385 | struct termio v; | |
386 | ||
387 | if (copy_from_user(&v, termio, sizeof(struct termio))) | |
388 | return -EFAULT; | |
389 | ||
390 | termios->c_iflag = (0xffff0000 & termios->c_iflag) | v.c_iflag; | |
391 | termios->c_oflag = (0xffff0000 & termios->c_oflag) | v.c_oflag; | |
392 | termios->c_cflag = (0xffff0000 & termios->c_cflag) | v.c_cflag; | |
393 | termios->c_lflag = (0xffff0000 & termios->c_lflag) | v.c_lflag; | |
394 | termios->c_line = (0xffff0000 & termios->c_lflag) | v.c_line; | |
395 | memcpy(termios->c_cc, v.c_cc, NCC); | |
396 | return 0; | |
397 | } | |
398 | ||
399 | /* | |
400 | * Translate a "termios" structure into a "termio". Ugh. | |
401 | */ | |
402 | __weak int kernel_termios_to_user_termio(struct termio __user *termio, | |
403 | struct ktermios *termios) | |
404 | { | |
405 | struct termio v; | |
406 | memset(&v, 0, sizeof(struct termio)); | |
407 | v.c_iflag = termios->c_iflag; | |
408 | v.c_oflag = termios->c_oflag; | |
409 | v.c_cflag = termios->c_cflag; | |
410 | v.c_lflag = termios->c_lflag; | |
411 | v.c_line = termios->c_line; | |
412 | memcpy(v.c_cc, termios->c_cc, NCC); | |
413 | return copy_to_user(termio, &v, sizeof(struct termio)); | |
414 | } | |
415 | ||
416 | #ifdef TCGETS2 | |
417 | __weak int user_termios_to_kernel_termios(struct ktermios *k, | |
418 | struct termios2 __user *u) | |
419 | { | |
420 | return copy_from_user(k, u, sizeof(struct termios2)); | |
421 | } | |
422 | __weak int kernel_termios_to_user_termios(struct termios2 __user *u, | |
423 | struct ktermios *k) | |
424 | { | |
425 | return copy_to_user(u, k, sizeof(struct termios2)); | |
426 | } | |
427 | __weak int user_termios_to_kernel_termios_1(struct ktermios *k, | |
428 | struct termios __user *u) | |
429 | { | |
430 | return copy_from_user(k, u, sizeof(struct termios)); | |
431 | } | |
432 | __weak int kernel_termios_to_user_termios_1(struct termios __user *u, | |
433 | struct ktermios *k) | |
434 | { | |
435 | return copy_to_user(u, k, sizeof(struct termios)); | |
436 | } | |
437 | ||
438 | #else | |
439 | ||
440 | __weak int user_termios_to_kernel_termios(struct ktermios *k, | |
441 | struct termios __user *u) | |
442 | { | |
443 | return copy_from_user(k, u, sizeof(struct termios)); | |
444 | } | |
445 | __weak int kernel_termios_to_user_termios(struct termios __user *u, | |
446 | struct ktermios *k) | |
447 | { | |
448 | return copy_to_user(u, k, sizeof(struct termios)); | |
449 | } | |
450 | #endif /* TCGETS2 */ | |
451 | ||
af9b897e AC |
452 | /** |
453 | * set_termios - set termios values for a tty | |
454 | * @tty: terminal device | |
455 | * @arg: user data | |
456 | * @opt: option information | |
457 | * | |
3a4fa0a2 | 458 | * Helper function to prepare termios data and run necessary other |
8d075b19 | 459 | * functions before using tty_set_termios to do the actual changes. |
af9b897e AC |
460 | * |
461 | * Locking: | |
6a1c0680 | 462 | * Called functions take ldisc and termios_rwsem locks |
af9b897e AC |
463 | */ |
464 | ||
355d95a1 | 465 | static int set_termios(struct tty_struct *tty, void __user *arg, int opt) |
1da177e4 | 466 | { |
edc6afc5 | 467 | struct ktermios tmp_termios; |
1da177e4 LT |
468 | struct tty_ldisc *ld; |
469 | int retval = tty_check_change(tty); | |
470 | ||
471 | if (retval) | |
472 | return retval; | |
473 | ||
6a1c0680 | 474 | down_read(&tty->termios_rwsem); |
adc8d746 | 475 | tmp_termios = tty->termios; |
6a1c0680 | 476 | up_read(&tty->termios_rwsem); |
64bb6c5e | 477 | |
1da177e4 | 478 | if (opt & TERMIOS_TERMIO) { |
1da177e4 LT |
479 | if (user_termio_to_kernel_termios(&tmp_termios, |
480 | (struct termio __user *)arg)) | |
481 | return -EFAULT; | |
edc6afc5 AC |
482 | #ifdef TCGETS2 |
483 | } else if (opt & TERMIOS_OLD) { | |
edc6afc5 | 484 | if (user_termios_to_kernel_termios_1(&tmp_termios, |
64bb6c5e | 485 | (struct termios __user *)arg)) |
edc6afc5 | 486 | return -EFAULT; |
1da177e4 LT |
487 | } else { |
488 | if (user_termios_to_kernel_termios(&tmp_termios, | |
64bb6c5e | 489 | (struct termios2 __user *)arg)) |
1da177e4 LT |
490 | return -EFAULT; |
491 | } | |
64bb6c5e AC |
492 | #else |
493 | } else if (user_termios_to_kernel_termios(&tmp_termios, | |
494 | (struct termios __user *)arg)) | |
495 | return -EFAULT; | |
496 | #endif | |
1da177e4 | 497 | |
355d95a1 AC |
498 | /* If old style Bfoo values are used then load c_ispeed/c_ospeed |
499 | * with the real speed so its unconditionally usable */ | |
edc6afc5 AC |
500 | tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios); |
501 | tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios); | |
502 | ||
1da177e4 | 503 | ld = tty_ldisc_ref(tty); |
355d95a1 | 504 | |
1da177e4 | 505 | if (ld != NULL) { |
a352def2 AC |
506 | if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer) |
507 | ld->ops->flush_buffer(tty); | |
1da177e4 LT |
508 | tty_ldisc_deref(ld); |
509 | } | |
355d95a1 | 510 | |
1da177e4 LT |
511 | if (opt & TERMIOS_WAIT) { |
512 | tty_wait_until_sent(tty, 0); | |
513 | if (signal_pending(current)) | |
183d95cd | 514 | return -ERESTARTSYS; |
1da177e4 LT |
515 | } |
516 | ||
8d075b19 | 517 | tty_set_termios(tty, &tmp_termios); |
5f519d72 AC |
518 | |
519 | /* FIXME: Arguably if tmp_termios == tty->termios AND the | |
520 | actual requested termios was not tmp_termios then we may | |
521 | want to return an error as no user requested change has | |
522 | succeeded */ | |
1da177e4 LT |
523 | return 0; |
524 | } | |
525 | ||
26a2e20f AC |
526 | static void copy_termios(struct tty_struct *tty, struct ktermios *kterm) |
527 | { | |
6a1c0680 | 528 | down_read(&tty->termios_rwsem); |
adc8d746 | 529 | *kterm = tty->termios; |
6a1c0680 | 530 | up_read(&tty->termios_rwsem); |
26a2e20f AC |
531 | } |
532 | ||
533 | static void copy_termios_locked(struct tty_struct *tty, struct ktermios *kterm) | |
534 | { | |
6a1c0680 | 535 | down_read(&tty->termios_rwsem); |
adc8d746 | 536 | *kterm = tty->termios_locked; |
6a1c0680 | 537 | up_read(&tty->termios_rwsem); |
26a2e20f AC |
538 | } |
539 | ||
355d95a1 | 540 | static int get_termio(struct tty_struct *tty, struct termio __user *termio) |
1da177e4 | 541 | { |
26a2e20f AC |
542 | struct ktermios kterm; |
543 | copy_termios(tty, &kterm); | |
544 | if (kernel_termios_to_user_termio(termio, &kterm)) | |
1da177e4 LT |
545 | return -EFAULT; |
546 | return 0; | |
547 | } | |
548 | ||
1da177e4 LT |
549 | #ifdef TIOCGETP |
550 | /* | |
551 | * These are deprecated, but there is limited support.. | |
552 | * | |
553 | * The "sg_flags" translation is a joke.. | |
554 | */ | |
355d95a1 | 555 | static int get_sgflags(struct tty_struct *tty) |
1da177e4 LT |
556 | { |
557 | int flags = 0; | |
558 | ||
9db276f8 PH |
559 | if (!L_ICANON(tty)) { |
560 | if (L_ISIG(tty)) | |
1da177e4 LT |
561 | flags |= 0x02; /* cbreak */ |
562 | else | |
563 | flags |= 0x20; /* raw */ | |
564 | } | |
9db276f8 | 565 | if (L_ECHO(tty)) |
1da177e4 | 566 | flags |= 0x08; /* echo */ |
9db276f8 PH |
567 | if (O_OPOST(tty)) |
568 | if (O_ONLCR(tty)) | |
1da177e4 LT |
569 | flags |= 0x10; /* crmod */ |
570 | return flags; | |
571 | } | |
572 | ||
355d95a1 | 573 | static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
1da177e4 LT |
574 | { |
575 | struct sgttyb tmp; | |
576 | ||
6a1c0680 | 577 | down_read(&tty->termios_rwsem); |
adc8d746 AC |
578 | tmp.sg_ispeed = tty->termios.c_ispeed; |
579 | tmp.sg_ospeed = tty->termios.c_ospeed; | |
580 | tmp.sg_erase = tty->termios.c_cc[VERASE]; | |
581 | tmp.sg_kill = tty->termios.c_cc[VKILL]; | |
1da177e4 | 582 | tmp.sg_flags = get_sgflags(tty); |
6a1c0680 | 583 | up_read(&tty->termios_rwsem); |
355d95a1 | 584 | |
1da177e4 LT |
585 | return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
586 | } | |
587 | ||
355d95a1 | 588 | static void set_sgflags(struct ktermios *termios, int flags) |
1da177e4 | 589 | { |
9833facf AC |
590 | termios->c_iflag = ICRNL | IXON; |
591 | termios->c_oflag = 0; | |
592 | termios->c_lflag = ISIG | ICANON; | |
1da177e4 | 593 | if (flags & 0x02) { /* cbreak */ |
9833facf AC |
594 | termios->c_iflag = 0; |
595 | termios->c_lflag &= ~ICANON; | |
1da177e4 LT |
596 | } |
597 | if (flags & 0x08) { /* echo */ | |
9833facf | 598 | termios->c_lflag |= ECHO | ECHOE | ECHOK | |
1da177e4 LT |
599 | ECHOCTL | ECHOKE | IEXTEN; |
600 | } | |
601 | if (flags & 0x10) { /* crmod */ | |
9833facf | 602 | termios->c_oflag |= OPOST | ONLCR; |
1da177e4 LT |
603 | } |
604 | if (flags & 0x20) { /* raw */ | |
9833facf AC |
605 | termios->c_iflag = 0; |
606 | termios->c_lflag &= ~(ISIG | ICANON); | |
1da177e4 | 607 | } |
9833facf AC |
608 | if (!(termios->c_lflag & ICANON)) { |
609 | termios->c_cc[VMIN] = 1; | |
610 | termios->c_cc[VTIME] = 0; | |
1da177e4 LT |
611 | } |
612 | } | |
613 | ||
af9b897e AC |
614 | /** |
615 | * set_sgttyb - set legacy terminal values | |
616 | * @tty: tty structure | |
617 | * @sgttyb: pointer to old style terminal structure | |
618 | * | |
619 | * Updates a terminal from the legacy BSD style terminal information | |
620 | * structure. | |
621 | * | |
6a1c0680 | 622 | * Locking: termios_rwsem |
af9b897e AC |
623 | */ |
624 | ||
355d95a1 | 625 | static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
1da177e4 LT |
626 | { |
627 | int retval; | |
628 | struct sgttyb tmp; | |
edc6afc5 | 629 | struct ktermios termios; |
1da177e4 LT |
630 | |
631 | retval = tty_check_change(tty); | |
632 | if (retval) | |
633 | return retval; | |
355d95a1 | 634 | |
1da177e4 LT |
635 | if (copy_from_user(&tmp, sgttyb, sizeof(tmp))) |
636 | return -EFAULT; | |
637 | ||
6a1c0680 | 638 | down_write(&tty->termios_rwsem); |
adc8d746 | 639 | termios = tty->termios; |
1da177e4 LT |
640 | termios.c_cc[VERASE] = tmp.sg_erase; |
641 | termios.c_cc[VKILL] = tmp.sg_kill; | |
642 | set_sgflags(&termios, tmp.sg_flags); | |
edc6afc5 | 643 | /* Try and encode into Bfoo format */ |
355d95a1 AC |
644 | tty_termios_encode_baud_rate(&termios, termios.c_ispeed, |
645 | termios.c_ospeed); | |
6a1c0680 | 646 | up_write(&tty->termios_rwsem); |
8d075b19 | 647 | tty_set_termios(tty, &termios); |
1da177e4 LT |
648 | return 0; |
649 | } | |
650 | #endif | |
651 | ||
652 | #ifdef TIOCGETC | |
355d95a1 | 653 | static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
1da177e4 LT |
654 | { |
655 | struct tchars tmp; | |
656 | ||
6a1c0680 | 657 | down_read(&tty->termios_rwsem); |
adc8d746 AC |
658 | tmp.t_intrc = tty->termios.c_cc[VINTR]; |
659 | tmp.t_quitc = tty->termios.c_cc[VQUIT]; | |
660 | tmp.t_startc = tty->termios.c_cc[VSTART]; | |
661 | tmp.t_stopc = tty->termios.c_cc[VSTOP]; | |
662 | tmp.t_eofc = tty->termios.c_cc[VEOF]; | |
663 | tmp.t_brkc = tty->termios.c_cc[VEOL2]; /* what is brkc anyway? */ | |
6a1c0680 | 664 | up_read(&tty->termios_rwsem); |
1da177e4 LT |
665 | return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
666 | } | |
667 | ||
355d95a1 | 668 | static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
1da177e4 LT |
669 | { |
670 | struct tchars tmp; | |
671 | ||
672 | if (copy_from_user(&tmp, tchars, sizeof(tmp))) | |
673 | return -EFAULT; | |
6a1c0680 | 674 | down_write(&tty->termios_rwsem); |
adc8d746 AC |
675 | tty->termios.c_cc[VINTR] = tmp.t_intrc; |
676 | tty->termios.c_cc[VQUIT] = tmp.t_quitc; | |
677 | tty->termios.c_cc[VSTART] = tmp.t_startc; | |
678 | tty->termios.c_cc[VSTOP] = tmp.t_stopc; | |
679 | tty->termios.c_cc[VEOF] = tmp.t_eofc; | |
680 | tty->termios.c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */ | |
6a1c0680 | 681 | up_write(&tty->termios_rwsem); |
1da177e4 LT |
682 | return 0; |
683 | } | |
684 | #endif | |
685 | ||
686 | #ifdef TIOCGLTC | |
355d95a1 | 687 | static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
1da177e4 LT |
688 | { |
689 | struct ltchars tmp; | |
690 | ||
6a1c0680 | 691 | down_read(&tty->termios_rwsem); |
adc8d746 | 692 | tmp.t_suspc = tty->termios.c_cc[VSUSP]; |
355d95a1 | 693 | /* what is dsuspc anyway? */ |
adc8d746 AC |
694 | tmp.t_dsuspc = tty->termios.c_cc[VSUSP]; |
695 | tmp.t_rprntc = tty->termios.c_cc[VREPRINT]; | |
355d95a1 | 696 | /* what is flushc anyway? */ |
adc8d746 AC |
697 | tmp.t_flushc = tty->termios.c_cc[VEOL2]; |
698 | tmp.t_werasc = tty->termios.c_cc[VWERASE]; | |
699 | tmp.t_lnextc = tty->termios.c_cc[VLNEXT]; | |
6a1c0680 | 700 | up_read(&tty->termios_rwsem); |
1da177e4 LT |
701 | return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
702 | } | |
703 | ||
355d95a1 | 704 | static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
1da177e4 LT |
705 | { |
706 | struct ltchars tmp; | |
707 | ||
708 | if (copy_from_user(&tmp, ltchars, sizeof(tmp))) | |
709 | return -EFAULT; | |
710 | ||
6a1c0680 | 711 | down_write(&tty->termios_rwsem); |
adc8d746 | 712 | tty->termios.c_cc[VSUSP] = tmp.t_suspc; |
355d95a1 | 713 | /* what is dsuspc anyway? */ |
adc8d746 AC |
714 | tty->termios.c_cc[VEOL2] = tmp.t_dsuspc; |
715 | tty->termios.c_cc[VREPRINT] = tmp.t_rprntc; | |
355d95a1 | 716 | /* what is flushc anyway? */ |
adc8d746 AC |
717 | tty->termios.c_cc[VEOL2] = tmp.t_flushc; |
718 | tty->termios.c_cc[VWERASE] = tmp.t_werasc; | |
719 | tty->termios.c_cc[VLNEXT] = tmp.t_lnextc; | |
6a1c0680 | 720 | up_write(&tty->termios_rwsem); |
1da177e4 LT |
721 | return 0; |
722 | } | |
723 | #endif | |
724 | ||
1c2630cc AC |
725 | /** |
726 | * tty_change_softcar - carrier change ioctl helper | |
727 | * @tty: tty to update | |
728 | * @arg: enable/disable CLOCAL | |
729 | * | |
730 | * Perform a change to the CLOCAL state and call into the driver | |
6a1c0680 | 731 | * layer to make it visible. All done with the termios rwsem |
1c2630cc AC |
732 | */ |
733 | ||
734 | static int tty_change_softcar(struct tty_struct *tty, int arg) | |
735 | { | |
736 | int ret = 0; | |
737 | int bit = arg ? CLOCAL : 0; | |
f34d7a5b | 738 | struct ktermios old; |
1c2630cc | 739 | |
6a1c0680 | 740 | down_write(&tty->termios_rwsem); |
adc8d746 AC |
741 | old = tty->termios; |
742 | tty->termios.c_cflag &= ~CLOCAL; | |
743 | tty->termios.c_cflag |= bit; | |
f34d7a5b AC |
744 | if (tty->ops->set_termios) |
745 | tty->ops->set_termios(tty, &old); | |
9db276f8 | 746 | if (C_CLOCAL(tty) != bit) |
1c2630cc | 747 | ret = -EINVAL; |
6a1c0680 | 748 | up_write(&tty->termios_rwsem); |
1c2630cc AC |
749 | return ret; |
750 | } | |
751 | ||
0fc00e24 AC |
752 | /** |
753 | * tty_mode_ioctl - mode related ioctls | |
754 | * @tty: tty for the ioctl | |
0fc00e24 AC |
755 | * @cmd: command |
756 | * @arg: ioctl argument | |
757 | * | |
758 | * Perform non line discipline specific mode control ioctls. This | |
759 | * is designed to be called by line disciplines to ensure they provide | |
760 | * consistent mode setting. | |
761 | */ | |
762 | ||
dcc223e8 | 763 | int tty_mode_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) |
1da177e4 | 764 | { |
355d95a1 | 765 | struct tty_struct *real_tty; |
1da177e4 | 766 | void __user *p = (void __user *)arg; |
8f520021 | 767 | int ret = 0; |
26a2e20f | 768 | struct ktermios kterm; |
1da177e4 LT |
769 | |
770 | if (tty->driver->type == TTY_DRIVER_TYPE_PTY && | |
771 | tty->driver->subtype == PTY_TYPE_MASTER) | |
772 | real_tty = tty->link; | |
773 | else | |
774 | real_tty = tty; | |
775 | ||
776 | switch (cmd) { | |
777 | #ifdef TIOCGETP | |
355d95a1 AC |
778 | case TIOCGETP: |
779 | return get_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
780 | case TIOCSETP: | |
781 | case TIOCSETN: | |
782 | return set_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
1da177e4 LT |
783 | #endif |
784 | #ifdef TIOCGETC | |
355d95a1 AC |
785 | case TIOCGETC: |
786 | return get_tchars(real_tty, p); | |
787 | case TIOCSETC: | |
788 | return set_tchars(real_tty, p); | |
1da177e4 LT |
789 | #endif |
790 | #ifdef TIOCGLTC | |
355d95a1 AC |
791 | case TIOCGLTC: |
792 | return get_ltchars(real_tty, p); | |
793 | case TIOCSLTC: | |
794 | return set_ltchars(real_tty, p); | |
1da177e4 | 795 | #endif |
355d95a1 AC |
796 | case TCSETSF: |
797 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD); | |
798 | case TCSETSW: | |
799 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD); | |
800 | case TCSETS: | |
801 | return set_termios(real_tty, p, TERMIOS_OLD); | |
edc6afc5 | 802 | #ifndef TCGETS2 |
355d95a1 | 803 | case TCGETS: |
26a2e20f AC |
804 | copy_termios(real_tty, &kterm); |
805 | if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm)) | |
8f520021 | 806 | ret = -EFAULT; |
8f520021 | 807 | return ret; |
edc6afc5 | 808 | #else |
355d95a1 | 809 | case TCGETS: |
26a2e20f AC |
810 | copy_termios(real_tty, &kterm); |
811 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm)) | |
8f520021 | 812 | ret = -EFAULT; |
8f520021 | 813 | return ret; |
355d95a1 | 814 | case TCGETS2: |
26a2e20f AC |
815 | copy_termios(real_tty, &kterm); |
816 | if (kernel_termios_to_user_termios((struct termios2 __user *)arg, &kterm)) | |
8f520021 | 817 | ret = -EFAULT; |
8f520021 | 818 | return ret; |
355d95a1 AC |
819 | case TCSETSF2: |
820 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT); | |
821 | case TCSETSW2: | |
822 | return set_termios(real_tty, p, TERMIOS_WAIT); | |
823 | case TCSETS2: | |
824 | return set_termios(real_tty, p, 0); | |
edc6afc5 | 825 | #endif |
355d95a1 AC |
826 | case TCGETA: |
827 | return get_termio(real_tty, p); | |
828 | case TCSETAF: | |
829 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO); | |
830 | case TCSETAW: | |
831 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO); | |
832 | case TCSETA: | |
833 | return set_termios(real_tty, p, TERMIOS_TERMIO); | |
0fc00e24 | 834 | #ifndef TCGETS2 |
355d95a1 | 835 | case TIOCGLCKTRMIOS: |
26a2e20f AC |
836 | copy_termios_locked(real_tty, &kterm); |
837 | if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm)) | |
8f520021 | 838 | ret = -EFAULT; |
8f520021 | 839 | return ret; |
355d95a1 AC |
840 | case TIOCSLCKTRMIOS: |
841 | if (!capable(CAP_SYS_ADMIN)) | |
842 | return -EPERM; | |
26a2e20f AC |
843 | copy_termios_locked(real_tty, &kterm); |
844 | if (user_termios_to_kernel_termios(&kterm, | |
355d95a1 | 845 | (struct termios __user *) arg)) |
26a2e20f | 846 | return -EFAULT; |
6a1c0680 | 847 | down_write(&real_tty->termios_rwsem); |
adc8d746 | 848 | real_tty->termios_locked = kterm; |
6a1c0680 | 849 | up_write(&real_tty->termios_rwsem); |
26a2e20f | 850 | return 0; |
0fc00e24 | 851 | #else |
355d95a1 | 852 | case TIOCGLCKTRMIOS: |
26a2e20f AC |
853 | copy_termios_locked(real_tty, &kterm); |
854 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm)) | |
8f520021 | 855 | ret = -EFAULT; |
8f520021 | 856 | return ret; |
355d95a1 AC |
857 | case TIOCSLCKTRMIOS: |
858 | if (!capable(CAP_SYS_ADMIN)) | |
26a2e20f AC |
859 | return -EPERM; |
860 | copy_termios_locked(real_tty, &kterm); | |
861 | if (user_termios_to_kernel_termios_1(&kterm, | |
355d95a1 | 862 | (struct termios __user *) arg)) |
26a2e20f | 863 | return -EFAULT; |
6a1c0680 | 864 | down_write(&real_tty->termios_rwsem); |
adc8d746 | 865 | real_tty->termios_locked = kterm; |
6a1c0680 | 866 | up_write(&real_tty->termios_rwsem); |
8f520021 | 867 | return ret; |
0fc00e24 | 868 | #endif |
1d65b4a0 | 869 | #ifdef TCGETX |
e0efb316 | 870 | case TCGETX: |
1d65b4a0 | 871 | case TCSETX: |
1d65b4a0 | 872 | case TCSETXW: |
1d65b4a0 | 873 | case TCSETXF: |
8871de06 JH |
874 | return -ENOTTY; |
875 | #endif | |
355d95a1 | 876 | case TIOCGSOFTCAR: |
26a2e20f AC |
877 | copy_termios(real_tty, &kterm); |
878 | ret = put_user((kterm.c_cflag & CLOCAL) ? 1 : 0, | |
355d95a1 | 879 | (int __user *)arg); |
8f520021 | 880 | return ret; |
355d95a1 AC |
881 | case TIOCSSOFTCAR: |
882 | if (get_user(arg, (unsigned int __user *) arg)) | |
883 | return -EFAULT; | |
f753f327 | 884 | return tty_change_softcar(real_tty, arg); |
355d95a1 AC |
885 | default: |
886 | return -ENOIOCTLCMD; | |
0fc00e24 AC |
887 | } |
888 | } | |
0fc00e24 AC |
889 | EXPORT_SYMBOL_GPL(tty_mode_ioctl); |
890 | ||
e7f3880c PH |
891 | |
892 | /* Caller guarantees ldisc reference is held */ | |
893 | static int __tty_perform_flush(struct tty_struct *tty, unsigned long arg) | |
0fc00e24 | 894 | { |
e7f3880c | 895 | struct tty_ldisc *ld = tty->ldisc; |
0fc00e24 | 896 | |
0fc00e24 AC |
897 | switch (arg) { |
898 | case TCIFLUSH: | |
a1bf9584 | 899 | if (ld && ld->ops->flush_buffer) { |
a352def2 | 900 | ld->ops->flush_buffer(tty); |
a1bf9584 IZ |
901 | tty_unthrottle(tty); |
902 | } | |
0fc00e24 AC |
903 | break; |
904 | case TCIOFLUSH: | |
a1bf9584 | 905 | if (ld && ld->ops->flush_buffer) { |
a352def2 | 906 | ld->ops->flush_buffer(tty); |
a1bf9584 IZ |
907 | tty_unthrottle(tty); |
908 | } | |
df561f66 | 909 | fallthrough; |
0fc00e24 | 910 | case TCOFLUSH: |
f34d7a5b | 911 | tty_driver_flush_buffer(tty); |
0fc00e24 AC |
912 | break; |
913 | default: | |
0fc00e24 AC |
914 | return -EINVAL; |
915 | } | |
0fc00e24 AC |
916 | return 0; |
917 | } | |
e7f3880c PH |
918 | |
919 | int tty_perform_flush(struct tty_struct *tty, unsigned long arg) | |
920 | { | |
921 | struct tty_ldisc *ld; | |
922 | int retval = tty_check_change(tty); | |
923 | if (retval) | |
924 | return retval; | |
925 | ||
926 | ld = tty_ldisc_ref_wait(tty); | |
927 | retval = __tty_perform_flush(tty, arg); | |
928 | if (ld) | |
929 | tty_ldisc_deref(ld); | |
930 | return retval; | |
931 | } | |
0fc00e24 AC |
932 | EXPORT_SYMBOL_GPL(tty_perform_flush); |
933 | ||
7c783601 JS |
934 | int n_tty_ioctl_helper(struct tty_struct *tty, unsigned int cmd, |
935 | unsigned long arg) | |
0fc00e24 | 936 | { |
0fc00e24 AC |
937 | int retval; |
938 | ||
0fc00e24 | 939 | switch (cmd) { |
355d95a1 AC |
940 | case TCXONC: |
941 | retval = tty_check_change(tty); | |
942 | if (retval) | |
943 | return retval; | |
944 | switch (arg) { | |
945 | case TCOOFF: | |
6e94dbc7 JS |
946 | spin_lock_irq(&tty->flow.lock); |
947 | if (!tty->flow.tco_stopped) { | |
948 | tty->flow.tco_stopped = true; | |
c545b66c | 949 | __stop_tty(tty); |
1da177e4 | 950 | } |
6e94dbc7 | 951 | spin_unlock_irq(&tty->flow.lock); |
355d95a1 AC |
952 | break; |
953 | case TCOON: | |
6e94dbc7 JS |
954 | spin_lock_irq(&tty->flow.lock); |
955 | if (tty->flow.tco_stopped) { | |
956 | tty->flow.tco_stopped = false; | |
c545b66c | 957 | __start_tty(tty); |
355d95a1 | 958 | } |
6e94dbc7 | 959 | spin_unlock_irq(&tty->flow.lock); |
355d95a1 AC |
960 | break; |
961 | case TCIOFF: | |
962 | if (STOP_CHAR(tty) != __DISABLED_CHAR) | |
c274f6ef | 963 | retval = tty_send_xchar(tty, STOP_CHAR(tty)); |
355d95a1 AC |
964 | break; |
965 | case TCION: | |
966 | if (START_CHAR(tty) != __DISABLED_CHAR) | |
c274f6ef | 967 | retval = tty_send_xchar(tty, START_CHAR(tty)); |
355d95a1 | 968 | break; |
1da177e4 | 969 | default: |
355d95a1 | 970 | return -EINVAL; |
1da177e4 | 971 | } |
c274f6ef | 972 | return retval; |
355d95a1 | 973 | case TCFLSH: |
5cec7bf6 PH |
974 | retval = tty_check_change(tty); |
975 | if (retval) | |
976 | return retval; | |
e7f3880c | 977 | return __tty_perform_flush(tty, arg); |
355d95a1 AC |
978 | default: |
979 | /* Try the mode commands */ | |
dcc223e8 | 980 | return tty_mode_ioctl(tty, cmd, arg); |
355d95a1 | 981 | } |
1da177e4 | 982 | } |
47afa7a5 | 983 | EXPORT_SYMBOL(n_tty_ioctl_helper); |