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