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