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1da177e4 LT |
1 | /* |
2 | * linux/drivers/char/tty_ioctl.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
5 | * | |
6 | * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines | |
7 | * which can be dynamically activated and de-activated by the line | |
8 | * discipline handling modules (like SLIP). | |
9 | */ | |
10 | ||
11 | #include <linux/types.h> | |
12 | #include <linux/termios.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/major.h> | |
17 | #include <linux/tty.h> | |
18 | #include <linux/fcntl.h> | |
19 | #include <linux/string.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/bitops.h> | |
5785c95b | 23 | #include <linux/mutex.h> |
1da177e4 LT |
24 | |
25 | #include <asm/io.h> | |
26 | #include <asm/uaccess.h> | |
27 | #include <asm/system.h> | |
28 | ||
29 | #undef TTY_DEBUG_WAIT_UNTIL_SENT | |
30 | ||
31 | #undef DEBUG | |
32 | ||
33 | /* | |
34 | * Internal flag options for termios setting behavior | |
35 | */ | |
36 | #define TERMIOS_FLUSH 1 | |
37 | #define TERMIOS_WAIT 2 | |
38 | #define TERMIOS_TERMIO 4 | |
edc6afc5 | 39 | #define TERMIOS_OLD 8 |
1da177e4 | 40 | |
af9b897e AC |
41 | |
42 | /** | |
43 | * tty_wait_until_sent - wait for I/O to finish | |
44 | * @tty: tty we are waiting for | |
45 | * @timeout: how long we will wait | |
46 | * | |
47 | * Wait for characters pending in a tty driver to hit the wire, or | |
48 | * for a timeout to occur (eg due to flow control) | |
49 | * | |
50 | * Locking: none | |
51 | */ | |
52 | ||
355d95a1 | 53 | void tty_wait_until_sent(struct tty_struct *tty, long timeout) |
1da177e4 | 54 | { |
1da177e4 LT |
55 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT |
56 | char buf[64]; | |
355d95a1 | 57 | |
1da177e4 LT |
58 | printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf)); |
59 | #endif | |
60 | if (!tty->driver->chars_in_buffer) | |
61 | return; | |
1da177e4 LT |
62 | if (!timeout) |
63 | timeout = MAX_SCHEDULE_TIMEOUT; | |
5a52bd4a | 64 | if (wait_event_interruptible_timeout(tty->write_wait, |
db99247a | 65 | !tty->driver->chars_in_buffer(tty), timeout) < 0) |
5a52bd4a | 66 | return; |
1da177e4 LT |
67 | if (tty->driver->wait_until_sent) |
68 | tty->driver->wait_until_sent(tty, timeout); | |
1da177e4 | 69 | } |
1da177e4 LT |
70 | EXPORT_SYMBOL(tty_wait_until_sent); |
71 | ||
edc6afc5 AC |
72 | static void unset_locked_termios(struct ktermios *termios, |
73 | struct ktermios *old, | |
74 | struct ktermios *locked) | |
1da177e4 LT |
75 | { |
76 | int i; | |
355d95a1 AC |
77 | |
78 | #define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z))) | |
1da177e4 LT |
79 | |
80 | if (!locked) { | |
81 | printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n"); | |
82 | return; | |
83 | } | |
84 | ||
85 | NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag); | |
86 | NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag); | |
87 | NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag); | |
88 | NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag); | |
89 | termios->c_line = locked->c_line ? old->c_line : termios->c_line; | |
355d95a1 | 90 | for (i = 0; i < NCCS; i++) |
1da177e4 LT |
91 | termios->c_cc[i] = locked->c_cc[i] ? |
92 | old->c_cc[i] : termios->c_cc[i]; | |
edc6afc5 | 93 | /* FIXME: What should we do for i/ospeed */ |
1da177e4 LT |
94 | } |
95 | ||
edc6afc5 AC |
96 | /* |
97 | * Routine which returns the baud rate of the tty | |
98 | * | |
99 | * Note that the baud_table needs to be kept in sync with the | |
100 | * include/asm/termbits.h file. | |
101 | */ | |
102 | static const speed_t baud_table[] = { | |
103 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
104 | 9600, 19200, 38400, 57600, 115200, 230400, 460800, | |
105 | #ifdef __sparc__ | |
106 | 76800, 153600, 307200, 614400, 921600 | |
107 | #else | |
108 | 500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000, | |
109 | 2500000, 3000000, 3500000, 4000000 | |
110 | #endif | |
111 | }; | |
112 | ||
113 | #ifndef __sparc__ | |
114 | static const tcflag_t baud_bits[] = { | |
115 | B0, B50, B75, B110, B134, B150, B200, B300, B600, | |
116 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, | |
117 | B57600, B115200, B230400, B460800, B500000, B576000, | |
118 | B921600, B1000000, B1152000, B1500000, B2000000, B2500000, | |
119 | B3000000, B3500000, B4000000 | |
120 | }; | |
121 | #else | |
122 | static const tcflag_t baud_bits[] = { | |
123 | B0, B50, B75, B110, B134, B150, B200, B300, B600, | |
124 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, | |
125 | B57600, B115200, B230400, B460800, B76800, B153600, | |
126 | B307200, B614400, B921600 | |
127 | }; | |
128 | #endif | |
129 | ||
130 | static int n_baud_table = ARRAY_SIZE(baud_table); | |
131 | ||
132 | /** | |
133 | * tty_termios_baud_rate | |
134 | * @termios: termios structure | |
135 | * | |
136 | * Convert termios baud rate data into a speed. This should be called | |
137 | * with the termios lock held if this termios is a terminal termios | |
138 | * structure. May change the termios data. Device drivers can call this | |
139 | * function but should use ->c_[io]speed directly as they are updated. | |
140 | * | |
141 | * Locking: none | |
142 | */ | |
143 | ||
144 | speed_t tty_termios_baud_rate(struct ktermios *termios) | |
145 | { | |
146 | unsigned int cbaud; | |
147 | ||
148 | cbaud = termios->c_cflag & CBAUD; | |
149 | ||
150 | #ifdef BOTHER | |
151 | /* Magic token for arbitary speed via c_ispeed/c_ospeed */ | |
152 | if (cbaud == BOTHER) | |
153 | return termios->c_ospeed; | |
154 | #endif | |
155 | if (cbaud & CBAUDEX) { | |
156 | cbaud &= ~CBAUDEX; | |
157 | ||
158 | if (cbaud < 1 || cbaud + 15 > n_baud_table) | |
159 | termios->c_cflag &= ~CBAUDEX; | |
160 | else | |
161 | cbaud += 15; | |
162 | } | |
163 | return baud_table[cbaud]; | |
164 | } | |
edc6afc5 AC |
165 | EXPORT_SYMBOL(tty_termios_baud_rate); |
166 | ||
167 | /** | |
168 | * tty_termios_input_baud_rate | |
169 | * @termios: termios structure | |
170 | * | |
171 | * Convert termios baud rate data into a speed. This should be called | |
172 | * with the termios lock held if this termios is a terminal termios | |
173 | * structure. May change the termios data. Device drivers can call this | |
174 | * function but should use ->c_[io]speed directly as they are updated. | |
175 | * | |
176 | * Locking: none | |
177 | */ | |
178 | ||
179 | speed_t tty_termios_input_baud_rate(struct ktermios *termios) | |
180 | { | |
181 | #ifdef IBSHIFT | |
182 | unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD; | |
183 | ||
184 | if (cbaud == B0) | |
185 | return tty_termios_baud_rate(termios); | |
186 | ||
187 | /* Magic token for arbitary speed via c_ispeed*/ | |
188 | if (cbaud == BOTHER) | |
189 | return termios->c_ispeed; | |
190 | ||
191 | if (cbaud & CBAUDEX) { | |
192 | cbaud &= ~CBAUDEX; | |
193 | ||
194 | if (cbaud < 1 || cbaud + 15 > n_baud_table) | |
195 | termios->c_cflag &= ~(CBAUDEX << IBSHIFT); | |
196 | else | |
197 | cbaud += 15; | |
198 | } | |
199 | return baud_table[cbaud]; | |
200 | #else | |
201 | return tty_termios_baud_rate(termios); | |
202 | #endif | |
203 | } | |
edc6afc5 AC |
204 | EXPORT_SYMBOL(tty_termios_input_baud_rate); |
205 | ||
edc6afc5 AC |
206 | /** |
207 | * tty_termios_encode_baud_rate | |
78137e3b | 208 | * @termios: ktermios structure holding user requested state |
edc6afc5 AC |
209 | * @ispeed: input speed |
210 | * @ospeed: output speed | |
211 | * | |
212 | * Encode the speeds set into the passed termios structure. This is | |
213 | * used as a library helper for drivers os that they can report back | |
214 | * the actual speed selected when it differs from the speed requested | |
215 | * | |
78137e3b AC |
216 | * For maximal back compatibility with legacy SYS5/POSIX *nix behaviour |
217 | * we need to carefully set the bits when the user does not get the | |
218 | * desired speed. We allow small margins and preserve as much of possible | |
219 | * of the input intent to keep compatiblity. | |
edc6afc5 AC |
220 | * |
221 | * Locking: Caller should hold termios lock. This is already held | |
222 | * when calling this function from the driver termios handler. | |
5f519d72 AC |
223 | * |
224 | * The ifdefs deal with platforms whose owners have yet to update them | |
225 | * and will all go away once this is done. | |
edc6afc5 AC |
226 | */ |
227 | ||
75e8b71d MR |
228 | void tty_termios_encode_baud_rate(struct ktermios *termios, |
229 | speed_t ibaud, speed_t obaud) | |
edc6afc5 AC |
230 | { |
231 | int i = 0; | |
78137e3b AC |
232 | int ifound = -1, ofound = -1; |
233 | int iclose = ibaud/50, oclose = obaud/50; | |
234 | int ibinput = 0; | |
edc6afc5 | 235 | |
5f519d72 AC |
236 | if (obaud == 0) /* CD dropped */ |
237 | ibaud = 0; /* Clear ibaud to be sure */ | |
238 | ||
edc6afc5 AC |
239 | termios->c_ispeed = ibaud; |
240 | termios->c_ospeed = obaud; | |
241 | ||
5f519d72 | 242 | #ifdef BOTHER |
78137e3b AC |
243 | /* If the user asked for a precise weird speed give a precise weird |
244 | answer. If they asked for a Bfoo speed they many have problems | |
245 | digesting non-exact replies so fuzz a bit */ | |
246 | ||
247 | if ((termios->c_cflag & CBAUD) == BOTHER) | |
248 | oclose = 0; | |
249 | if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER) | |
250 | iclose = 0; | |
251 | if ((termios->c_cflag >> IBSHIFT) & CBAUD) | |
252 | ibinput = 1; /* An input speed was specified */ | |
5f519d72 | 253 | #endif |
edc6afc5 | 254 | termios->c_cflag &= ~CBAUD; |
edc6afc5 | 255 | |
5f519d72 AC |
256 | /* |
257 | * Our goal is to find a close match to the standard baud rate | |
258 | * returned. Walk the baud rate table and if we get a very close | |
259 | * match then report back the speed as a POSIX Bxxxx value by | |
260 | * preference | |
261 | */ | |
262 | ||
edc6afc5 | 263 | do { |
75e8b71d MR |
264 | if (obaud - oclose <= baud_table[i] && |
265 | obaud + oclose >= baud_table[i]) { | |
edc6afc5 | 266 | termios->c_cflag |= baud_bits[i]; |
78137e3b | 267 | ofound = i; |
edc6afc5 | 268 | } |
75e8b71d MR |
269 | if (ibaud - iclose <= baud_table[i] && |
270 | ibaud + iclose >= baud_table[i]) { | |
271 | /* For the case input == output don't set IBAUD bits | |
272 | if the user didn't do so */ | |
5f519d72 AC |
273 | if (ofound == i && !ibinput) |
274 | ifound = i; | |
275 | #ifdef IBSHIFT | |
276 | else { | |
277 | ifound = i; | |
78137e3b | 278 | termios->c_cflag |= (baud_bits[i] << IBSHIFT); |
5f519d72 AC |
279 | } |
280 | #endif | |
edc6afc5 | 281 | } |
6804396f | 282 | } while (++i < n_baud_table); |
5f519d72 AC |
283 | |
284 | /* | |
285 | * If we found no match then use BOTHER if provided or warn | |
286 | * the user their platform maintainer needs to wake up if not. | |
287 | */ | |
288 | #ifdef BOTHER | |
78137e3b | 289 | if (ofound == -1) |
edc6afc5 | 290 | termios->c_cflag |= BOTHER; |
78137e3b AC |
291 | /* Set exact input bits only if the input and output differ or the |
292 | user already did */ | |
6804396f | 293 | if (ifound == -1 && (ibaud != obaud || ibinput)) |
edc6afc5 | 294 | termios->c_cflag |= (BOTHER << IBSHIFT); |
5f519d72 AC |
295 | #else |
296 | if (ifound == -1 || ofound == -1) { | |
297 | static int warned; | |
298 | if (!warned++) | |
299 | printk(KERN_WARNING "tty: Unable to return correct " | |
300 | "speed data as your architecture needs updating.\n"); | |
301 | } | |
302 | #endif | |
edc6afc5 | 303 | } |
edc6afc5 AC |
304 | EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate); |
305 | ||
5f519d72 AC |
306 | void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud) |
307 | { | |
308 | tty_termios_encode_baud_rate(tty->termios, ibaud, obaud); | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(tty_encode_baud_rate); | |
edc6afc5 AC |
311 | |
312 | /** | |
313 | * tty_get_baud_rate - get tty bit rates | |
314 | * @tty: tty to query | |
315 | * | |
316 | * Returns the baud rate as an integer for this terminal. The | |
317 | * termios lock must be held by the caller and the terminal bit | |
318 | * flags may be updated. | |
319 | * | |
320 | * Locking: none | |
321 | */ | |
322 | ||
323 | speed_t tty_get_baud_rate(struct tty_struct *tty) | |
324 | { | |
325 | speed_t baud = tty_termios_baud_rate(tty->termios); | |
326 | ||
327 | if (baud == 38400 && tty->alt_speed) { | |
328 | if (!tty->warned) { | |
329 | printk(KERN_WARNING "Use of setserial/setrocket to " | |
330 | "set SPD_* flags is deprecated\n"); | |
331 | tty->warned = 1; | |
332 | } | |
333 | baud = tty->alt_speed; | |
334 | } | |
335 | ||
336 | return baud; | |
337 | } | |
edc6afc5 AC |
338 | EXPORT_SYMBOL(tty_get_baud_rate); |
339 | ||
5f519d72 AC |
340 | /** |
341 | * tty_termios_copy_hw - copy hardware settings | |
342 | * @new: New termios | |
343 | * @old: Old termios | |
344 | * | |
345 | * Propogate the hardware specific terminal setting bits from | |
346 | * the old termios structure to the new one. This is used in cases | |
347 | * where the hardware does not support reconfiguration or as a helper | |
348 | * in some cases where only minimal reconfiguration is supported | |
349 | */ | |
350 | ||
351 | void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old) | |
352 | { | |
353 | /* The bits a dumb device handles in software. Smart devices need | |
354 | to always provide a set_termios method */ | |
355 | new->c_cflag &= HUPCL | CREAD | CLOCAL; | |
356 | new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL); | |
357 | new->c_ispeed = old->c_ispeed; | |
358 | new->c_ospeed = old->c_ospeed; | |
359 | } | |
5f519d72 AC |
360 | EXPORT_SYMBOL(tty_termios_copy_hw); |
361 | ||
bf5e5834 AC |
362 | /** |
363 | * tty_termios_hw_change - check for setting change | |
364 | * @a: termios | |
365 | * @b: termios to compare | |
366 | * | |
367 | * Check if any of the bits that affect a dumb device have changed | |
368 | * between the two termios structures, or a speed change is needed. | |
369 | */ | |
370 | ||
371 | int tty_termios_hw_change(struct ktermios *a, struct ktermios *b) | |
372 | { | |
373 | if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed) | |
374 | return 1; | |
375 | if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL)) | |
376 | return 1; | |
377 | return 0; | |
378 | } | |
379 | EXPORT_SYMBOL(tty_termios_hw_change); | |
380 | ||
af9b897e AC |
381 | /** |
382 | * change_termios - update termios values | |
383 | * @tty: tty to update | |
384 | * @new_termios: desired new value | |
385 | * | |
386 | * Perform updates to the termios values set on this terminal. There | |
387 | * is a bit of layering violation here with n_tty in terms of the | |
388 | * internal knowledge of this function. | |
389 | * | |
390 | * Locking: termios_sem | |
391 | */ | |
392 | ||
355d95a1 | 393 | static void change_termios(struct tty_struct *tty, struct ktermios *new_termios) |
1da177e4 LT |
394 | { |
395 | int canon_change; | |
edc6afc5 | 396 | struct ktermios old_termios = *tty->termios; |
1da177e4 | 397 | struct tty_ldisc *ld; |
04f378b1 | 398 | unsigned long flags; |
355d95a1 | 399 | |
1da177e4 LT |
400 | /* |
401 | * Perform the actual termios internal changes under lock. | |
402 | */ | |
355d95a1 | 403 | |
1da177e4 LT |
404 | |
405 | /* FIXME: we need to decide on some locking/ordering semantics | |
406 | for the set_termios notification eventually */ | |
5785c95b | 407 | mutex_lock(&tty->termios_mutex); |
1da177e4 LT |
408 | |
409 | *tty->termios = *new_termios; | |
410 | unset_locked_termios(tty->termios, &old_termios, tty->termios_locked); | |
411 | canon_change = (old_termios.c_lflag ^ tty->termios->c_lflag) & ICANON; | |
412 | if (canon_change) { | |
413 | memset(&tty->read_flags, 0, sizeof tty->read_flags); | |
414 | tty->canon_head = tty->read_tail; | |
415 | tty->canon_data = 0; | |
416 | tty->erasing = 0; | |
417 | } | |
355d95a1 | 418 | |
5f519d72 | 419 | /* This bit should be in the ldisc code */ |
1da177e4 LT |
420 | if (canon_change && !L_ICANON(tty) && tty->read_cnt) |
421 | /* Get characters left over from canonical mode. */ | |
422 | wake_up_interruptible(&tty->read_wait); | |
423 | ||
424 | /* See if packet mode change of state. */ | |
1da177e4 LT |
425 | if (tty->link && tty->link->packet) { |
426 | int old_flow = ((old_termios.c_iflag & IXON) && | |
427 | (old_termios.c_cc[VSTOP] == '\023') && | |
428 | (old_termios.c_cc[VSTART] == '\021')); | |
429 | int new_flow = (I_IXON(tty) && | |
430 | STOP_CHAR(tty) == '\023' && | |
431 | START_CHAR(tty) == '\021'); | |
432 | if (old_flow != new_flow) { | |
04f378b1 | 433 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
1da177e4 LT |
434 | tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); |
435 | if (new_flow) | |
436 | tty->ctrl_status |= TIOCPKT_DOSTOP; | |
437 | else | |
438 | tty->ctrl_status |= TIOCPKT_NOSTOP; | |
04f378b1 | 439 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
1da177e4 LT |
440 | wake_up_interruptible(&tty->link->read_wait); |
441 | } | |
442 | } | |
355d95a1 | 443 | |
1da177e4 LT |
444 | if (tty->driver->set_termios) |
445 | (*tty->driver->set_termios)(tty, &old_termios); | |
5f519d72 AC |
446 | else |
447 | tty_termios_copy_hw(tty->termios, &old_termios); | |
1da177e4 LT |
448 | |
449 | ld = tty_ldisc_ref(tty); | |
450 | if (ld != NULL) { | |
451 | if (ld->set_termios) | |
452 | (ld->set_termios)(tty, &old_termios); | |
453 | tty_ldisc_deref(ld); | |
454 | } | |
5785c95b | 455 | mutex_unlock(&tty->termios_mutex); |
1da177e4 LT |
456 | } |
457 | ||
af9b897e AC |
458 | /** |
459 | * set_termios - set termios values for a tty | |
460 | * @tty: terminal device | |
461 | * @arg: user data | |
462 | * @opt: option information | |
463 | * | |
3a4fa0a2 | 464 | * Helper function to prepare termios data and run necessary other |
af9b897e AC |
465 | * functions before using change_termios to do the actual changes. |
466 | * | |
467 | * Locking: | |
468 | * Called functions take ldisc and termios_sem locks | |
469 | */ | |
470 | ||
355d95a1 | 471 | static int set_termios(struct tty_struct *tty, void __user *arg, int opt) |
1da177e4 | 472 | { |
edc6afc5 | 473 | struct ktermios tmp_termios; |
1da177e4 LT |
474 | struct tty_ldisc *ld; |
475 | int retval = tty_check_change(tty); | |
476 | ||
477 | if (retval) | |
478 | return retval; | |
479 | ||
64bb6c5e AC |
480 | memcpy(&tmp_termios, tty->termios, sizeof(struct ktermios)); |
481 | ||
1da177e4 | 482 | if (opt & TERMIOS_TERMIO) { |
1da177e4 LT |
483 | if (user_termio_to_kernel_termios(&tmp_termios, |
484 | (struct termio __user *)arg)) | |
485 | return -EFAULT; | |
edc6afc5 AC |
486 | #ifdef TCGETS2 |
487 | } else if (opt & TERMIOS_OLD) { | |
edc6afc5 | 488 | if (user_termios_to_kernel_termios_1(&tmp_termios, |
64bb6c5e | 489 | (struct termios __user *)arg)) |
edc6afc5 | 490 | return -EFAULT; |
1da177e4 LT |
491 | } else { |
492 | if (user_termios_to_kernel_termios(&tmp_termios, | |
64bb6c5e | 493 | (struct termios2 __user *)arg)) |
1da177e4 LT |
494 | return -EFAULT; |
495 | } | |
64bb6c5e AC |
496 | #else |
497 | } else if (user_termios_to_kernel_termios(&tmp_termios, | |
498 | (struct termios __user *)arg)) | |
499 | return -EFAULT; | |
500 | #endif | |
1da177e4 | 501 | |
355d95a1 AC |
502 | /* If old style Bfoo values are used then load c_ispeed/c_ospeed |
503 | * with the real speed so its unconditionally usable */ | |
edc6afc5 AC |
504 | tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios); |
505 | tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios); | |
506 | ||
1da177e4 | 507 | ld = tty_ldisc_ref(tty); |
355d95a1 | 508 | |
1da177e4 LT |
509 | if (ld != NULL) { |
510 | if ((opt & TERMIOS_FLUSH) && ld->flush_buffer) | |
511 | ld->flush_buffer(tty); | |
512 | tty_ldisc_deref(ld); | |
513 | } | |
355d95a1 | 514 | |
1da177e4 LT |
515 | if (opt & TERMIOS_WAIT) { |
516 | tty_wait_until_sent(tty, 0); | |
517 | if (signal_pending(current)) | |
518 | return -EINTR; | |
519 | } | |
520 | ||
521 | change_termios(tty, &tmp_termios); | |
5f519d72 AC |
522 | |
523 | /* FIXME: Arguably if tmp_termios == tty->termios AND the | |
524 | actual requested termios was not tmp_termios then we may | |
525 | want to return an error as no user requested change has | |
526 | succeeded */ | |
1da177e4 LT |
527 | return 0; |
528 | } | |
529 | ||
355d95a1 | 530 | static int get_termio(struct tty_struct *tty, struct termio __user *termio) |
1da177e4 LT |
531 | { |
532 | if (kernel_termios_to_user_termio(termio, tty->termios)) | |
533 | return -EFAULT; | |
534 | return 0; | |
535 | } | |
536 | ||
355d95a1 | 537 | static unsigned long inq_canon(struct tty_struct *tty) |
1da177e4 LT |
538 | { |
539 | int nr, head, tail; | |
540 | ||
541 | if (!tty->canon_data || !tty->read_buf) | |
542 | return 0; | |
543 | head = tty->canon_head; | |
544 | tail = tty->read_tail; | |
545 | nr = (head - tail) & (N_TTY_BUF_SIZE-1); | |
546 | /* Skip EOF-chars.. */ | |
547 | while (head != tail) { | |
548 | if (test_bit(tail, tty->read_flags) && | |
549 | tty->read_buf[tail] == __DISABLED_CHAR) | |
550 | nr--; | |
551 | tail = (tail+1) & (N_TTY_BUF_SIZE-1); | |
552 | } | |
553 | return nr; | |
554 | } | |
555 | ||
556 | #ifdef TIOCGETP | |
557 | /* | |
558 | * These are deprecated, but there is limited support.. | |
559 | * | |
560 | * The "sg_flags" translation is a joke.. | |
561 | */ | |
355d95a1 | 562 | static int get_sgflags(struct tty_struct *tty) |
1da177e4 LT |
563 | { |
564 | int flags = 0; | |
565 | ||
566 | if (!(tty->termios->c_lflag & ICANON)) { | |
567 | if (tty->termios->c_lflag & ISIG) | |
568 | flags |= 0x02; /* cbreak */ | |
569 | else | |
570 | flags |= 0x20; /* raw */ | |
571 | } | |
572 | if (tty->termios->c_lflag & ECHO) | |
573 | flags |= 0x08; /* echo */ | |
574 | if (tty->termios->c_oflag & OPOST) | |
575 | if (tty->termios->c_oflag & ONLCR) | |
576 | flags |= 0x10; /* crmod */ | |
577 | return flags; | |
578 | } | |
579 | ||
355d95a1 | 580 | static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
1da177e4 LT |
581 | { |
582 | struct sgttyb tmp; | |
583 | ||
5785c95b | 584 | mutex_lock(&tty->termios_mutex); |
606d099c AC |
585 | tmp.sg_ispeed = tty->termios->c_ispeed; |
586 | tmp.sg_ospeed = tty->termios->c_ospeed; | |
1da177e4 LT |
587 | tmp.sg_erase = tty->termios->c_cc[VERASE]; |
588 | tmp.sg_kill = tty->termios->c_cc[VKILL]; | |
589 | tmp.sg_flags = get_sgflags(tty); | |
5785c95b | 590 | mutex_unlock(&tty->termios_mutex); |
355d95a1 | 591 | |
1da177e4 LT |
592 | return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
593 | } | |
594 | ||
355d95a1 | 595 | static void set_sgflags(struct ktermios *termios, int flags) |
1da177e4 LT |
596 | { |
597 | termios->c_iflag = ICRNL | IXON; | |
598 | termios->c_oflag = 0; | |
599 | termios->c_lflag = ISIG | ICANON; | |
600 | if (flags & 0x02) { /* cbreak */ | |
601 | termios->c_iflag = 0; | |
602 | termios->c_lflag &= ~ICANON; | |
603 | } | |
604 | if (flags & 0x08) { /* echo */ | |
605 | termios->c_lflag |= ECHO | ECHOE | ECHOK | | |
606 | ECHOCTL | ECHOKE | IEXTEN; | |
607 | } | |
608 | if (flags & 0x10) { /* crmod */ | |
609 | termios->c_oflag |= OPOST | ONLCR; | |
610 | } | |
611 | if (flags & 0x20) { /* raw */ | |
612 | termios->c_iflag = 0; | |
613 | termios->c_lflag &= ~(ISIG | ICANON); | |
614 | } | |
615 | if (!(termios->c_lflag & ICANON)) { | |
616 | termios->c_cc[VMIN] = 1; | |
617 | termios->c_cc[VTIME] = 0; | |
618 | } | |
619 | } | |
620 | ||
af9b897e AC |
621 | /** |
622 | * set_sgttyb - set legacy terminal values | |
623 | * @tty: tty structure | |
624 | * @sgttyb: pointer to old style terminal structure | |
625 | * | |
626 | * Updates a terminal from the legacy BSD style terminal information | |
627 | * structure. | |
628 | * | |
629 | * Locking: termios_sem | |
630 | */ | |
631 | ||
355d95a1 | 632 | static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
1da177e4 LT |
633 | { |
634 | int retval; | |
635 | struct sgttyb tmp; | |
edc6afc5 | 636 | struct ktermios termios; |
1da177e4 LT |
637 | |
638 | retval = tty_check_change(tty); | |
639 | if (retval) | |
640 | return retval; | |
355d95a1 | 641 | |
1da177e4 LT |
642 | if (copy_from_user(&tmp, sgttyb, sizeof(tmp))) |
643 | return -EFAULT; | |
644 | ||
5785c95b | 645 | mutex_lock(&tty->termios_mutex); |
6804396f | 646 | termios = *tty->termios; |
1da177e4 LT |
647 | termios.c_cc[VERASE] = tmp.sg_erase; |
648 | termios.c_cc[VKILL] = tmp.sg_kill; | |
649 | set_sgflags(&termios, tmp.sg_flags); | |
edc6afc5 AC |
650 | /* Try and encode into Bfoo format */ |
651 | #ifdef BOTHER | |
355d95a1 AC |
652 | tty_termios_encode_baud_rate(&termios, termios.c_ispeed, |
653 | termios.c_ospeed); | |
edc6afc5 | 654 | #endif |
5785c95b | 655 | mutex_unlock(&tty->termios_mutex); |
1da177e4 LT |
656 | change_termios(tty, &termios); |
657 | return 0; | |
658 | } | |
659 | #endif | |
660 | ||
661 | #ifdef TIOCGETC | |
355d95a1 | 662 | static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
1da177e4 LT |
663 | { |
664 | struct tchars tmp; | |
665 | ||
666 | tmp.t_intrc = tty->termios->c_cc[VINTR]; | |
667 | tmp.t_quitc = tty->termios->c_cc[VQUIT]; | |
668 | tmp.t_startc = tty->termios->c_cc[VSTART]; | |
669 | tmp.t_stopc = tty->termios->c_cc[VSTOP]; | |
670 | tmp.t_eofc = tty->termios->c_cc[VEOF]; | |
671 | tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */ | |
672 | return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
673 | } | |
674 | ||
355d95a1 | 675 | static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
1da177e4 LT |
676 | { |
677 | struct tchars tmp; | |
678 | ||
679 | if (copy_from_user(&tmp, tchars, sizeof(tmp))) | |
680 | return -EFAULT; | |
681 | tty->termios->c_cc[VINTR] = tmp.t_intrc; | |
682 | tty->termios->c_cc[VQUIT] = tmp.t_quitc; | |
683 | tty->termios->c_cc[VSTART] = tmp.t_startc; | |
684 | tty->termios->c_cc[VSTOP] = tmp.t_stopc; | |
685 | tty->termios->c_cc[VEOF] = tmp.t_eofc; | |
686 | tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */ | |
687 | return 0; | |
688 | } | |
689 | #endif | |
690 | ||
691 | #ifdef TIOCGLTC | |
355d95a1 | 692 | static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
1da177e4 LT |
693 | { |
694 | struct ltchars tmp; | |
695 | ||
696 | tmp.t_suspc = tty->termios->c_cc[VSUSP]; | |
355d95a1 AC |
697 | /* what is dsuspc anyway? */ |
698 | tmp.t_dsuspc = tty->termios->c_cc[VSUSP]; | |
1da177e4 | 699 | tmp.t_rprntc = tty->termios->c_cc[VREPRINT]; |
355d95a1 AC |
700 | /* what is flushc anyway? */ |
701 | tmp.t_flushc = tty->termios->c_cc[VEOL2]; | |
1da177e4 LT |
702 | tmp.t_werasc = tty->termios->c_cc[VWERASE]; |
703 | tmp.t_lnextc = tty->termios->c_cc[VLNEXT]; | |
704 | return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
705 | } | |
706 | ||
355d95a1 | 707 | static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
1da177e4 LT |
708 | { |
709 | struct ltchars tmp; | |
710 | ||
711 | if (copy_from_user(&tmp, ltchars, sizeof(tmp))) | |
712 | return -EFAULT; | |
713 | ||
714 | tty->termios->c_cc[VSUSP] = tmp.t_suspc; | |
355d95a1 AC |
715 | /* what is dsuspc anyway? */ |
716 | tty->termios->c_cc[VEOL2] = tmp.t_dsuspc; | |
1da177e4 | 717 | tty->termios->c_cc[VREPRINT] = tmp.t_rprntc; |
355d95a1 AC |
718 | /* what is flushc anyway? */ |
719 | tty->termios->c_cc[VEOL2] = tmp.t_flushc; | |
1da177e4 LT |
720 | tty->termios->c_cc[VWERASE] = tmp.t_werasc; |
721 | tty->termios->c_cc[VLNEXT] = tmp.t_lnextc; | |
722 | return 0; | |
723 | } | |
724 | #endif | |
725 | ||
af9b897e AC |
726 | /** |
727 | * send_prio_char - send priority character | |
728 | * | |
729 | * Send a high priority character to the tty even if stopped | |
730 | * | |
5f412b24 | 731 | * Locking: none for xchar method, write ordering for write method. |
1da177e4 | 732 | */ |
af9b897e | 733 | |
5f412b24 | 734 | static int send_prio_char(struct tty_struct *tty, char ch) |
1da177e4 LT |
735 | { |
736 | int was_stopped = tty->stopped; | |
737 | ||
738 | if (tty->driver->send_xchar) { | |
739 | tty->driver->send_xchar(tty, ch); | |
5f412b24 | 740 | return 0; |
1da177e4 | 741 | } |
5f412b24 | 742 | |
9c1729db | 743 | if (tty_write_lock(tty, 0) < 0) |
5f412b24 AC |
744 | return -ERESTARTSYS; |
745 | ||
1da177e4 LT |
746 | if (was_stopped) |
747 | start_tty(tty); | |
748 | tty->driver->write(tty, &ch, 1); | |
749 | if (was_stopped) | |
750 | stop_tty(tty); | |
9c1729db | 751 | tty_write_unlock(tty); |
5f412b24 | 752 | return 0; |
1da177e4 LT |
753 | } |
754 | ||
0fc00e24 AC |
755 | /** |
756 | * tty_mode_ioctl - mode related ioctls | |
757 | * @tty: tty for the ioctl | |
758 | * @file: file pointer for the tty | |
759 | * @cmd: command | |
760 | * @arg: ioctl argument | |
761 | * | |
762 | * Perform non line discipline specific mode control ioctls. This | |
763 | * is designed to be called by line disciplines to ensure they provide | |
764 | * consistent mode setting. | |
765 | */ | |
766 | ||
355d95a1 | 767 | int tty_mode_ioctl(struct tty_struct *tty, struct file *file, |
0fc00e24 | 768 | unsigned int cmd, unsigned long arg) |
1da177e4 | 769 | { |
355d95a1 | 770 | struct tty_struct *real_tty; |
1da177e4 | 771 | void __user *p = (void __user *)arg; |
1da177e4 LT |
772 | |
773 | if (tty->driver->type == TTY_DRIVER_TYPE_PTY && | |
774 | tty->driver->subtype == PTY_TYPE_MASTER) | |
775 | real_tty = tty->link; | |
776 | else | |
777 | real_tty = tty; | |
778 | ||
779 | switch (cmd) { | |
780 | #ifdef TIOCGETP | |
355d95a1 AC |
781 | case TIOCGETP: |
782 | return get_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
783 | case TIOCSETP: | |
784 | case TIOCSETN: | |
785 | return set_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
1da177e4 LT |
786 | #endif |
787 | #ifdef TIOCGETC | |
355d95a1 AC |
788 | case TIOCGETC: |
789 | return get_tchars(real_tty, p); | |
790 | case TIOCSETC: | |
791 | return set_tchars(real_tty, p); | |
1da177e4 LT |
792 | #endif |
793 | #ifdef TIOCGLTC | |
355d95a1 AC |
794 | case TIOCGLTC: |
795 | return get_ltchars(real_tty, p); | |
796 | case TIOCSLTC: | |
797 | return set_ltchars(real_tty, p); | |
1da177e4 | 798 | #endif |
355d95a1 AC |
799 | case TCSETSF: |
800 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD); | |
801 | case TCSETSW: | |
802 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD); | |
803 | case TCSETS: | |
804 | return set_termios(real_tty, p, TERMIOS_OLD); | |
edc6afc5 | 805 | #ifndef TCGETS2 |
355d95a1 AC |
806 | case TCGETS: |
807 | if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios)) | |
808 | return -EFAULT; | |
809 | return 0; | |
edc6afc5 | 810 | #else |
355d95a1 AC |
811 | case TCGETS: |
812 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios)) | |
813 | return -EFAULT; | |
814 | return 0; | |
815 | case TCGETS2: | |
816 | if (kernel_termios_to_user_termios((struct termios2 __user *)arg, real_tty->termios)) | |
817 | return -EFAULT; | |
818 | return 0; | |
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 AC |
835 | case TIOCGLCKTRMIOS: |
836 | if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked)) | |
837 | return -EFAULT; | |
838 | return 0; | |
839 | case TIOCSLCKTRMIOS: | |
840 | if (!capable(CAP_SYS_ADMIN)) | |
841 | return -EPERM; | |
842 | if (user_termios_to_kernel_termios(real_tty->termios_locked, | |
843 | (struct termios __user *) arg)) | |
844 | return -EFAULT; | |
845 | return 0; | |
0fc00e24 | 846 | #else |
355d95a1 AC |
847 | case TIOCGLCKTRMIOS: |
848 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios_locked)) | |
849 | return -EFAULT; | |
850 | return 0; | |
851 | case TIOCSLCKTRMIOS: | |
852 | if (!capable(CAP_SYS_ADMIN)) | |
853 | return -EPERM; | |
854 | if (user_termios_to_kernel_termios_1(real_tty->termios_locked, | |
855 | (struct termios __user *) arg)) | |
856 | return -EFAULT; | |
0fc00e24 AC |
857 | return 0; |
858 | #endif | |
355d95a1 AC |
859 | case TIOCGSOFTCAR: |
860 | return put_user(C_CLOCAL(tty) ? 1 : 0, | |
861 | (int __user *)arg); | |
862 | case TIOCSSOFTCAR: | |
863 | if (get_user(arg, (unsigned int __user *) arg)) | |
864 | return -EFAULT; | |
865 | mutex_lock(&tty->termios_mutex); | |
866 | tty->termios->c_cflag = | |
867 | ((tty->termios->c_cflag & ~CLOCAL) | | |
868 | (arg ? CLOCAL : 0)); | |
869 | mutex_unlock(&tty->termios_mutex); | |
870 | return 0; | |
871 | default: | |
872 | return -ENOIOCTLCMD; | |
0fc00e24 AC |
873 | } |
874 | } | |
0fc00e24 AC |
875 | EXPORT_SYMBOL_GPL(tty_mode_ioctl); |
876 | ||
877 | int tty_perform_flush(struct tty_struct *tty, unsigned long arg) | |
878 | { | |
879 | struct tty_ldisc *ld; | |
880 | int retval = tty_check_change(tty); | |
881 | if (retval) | |
882 | return retval; | |
883 | ||
884 | ld = tty_ldisc_ref(tty); | |
885 | switch (arg) { | |
886 | case TCIFLUSH: | |
887 | if (ld && ld->flush_buffer) | |
888 | ld->flush_buffer(tty); | |
889 | break; | |
890 | case TCIOFLUSH: | |
891 | if (ld && ld->flush_buffer) | |
892 | ld->flush_buffer(tty); | |
893 | /* fall through */ | |
894 | case TCOFLUSH: | |
895 | if (tty->driver->flush_buffer) | |
896 | tty->driver->flush_buffer(tty); | |
897 | break; | |
898 | default: | |
899 | tty_ldisc_deref(ld); | |
900 | return -EINVAL; | |
901 | } | |
902 | tty_ldisc_deref(ld); | |
903 | return 0; | |
904 | } | |
0fc00e24 AC |
905 | EXPORT_SYMBOL_GPL(tty_perform_flush); |
906 | ||
355d95a1 | 907 | int n_tty_ioctl(struct tty_struct *tty, struct file *file, |
0fc00e24 AC |
908 | unsigned int cmd, unsigned long arg) |
909 | { | |
355d95a1 | 910 | struct tty_struct *real_tty; |
04f378b1 | 911 | unsigned long flags; |
0fc00e24 AC |
912 | int retval; |
913 | ||
914 | if (tty->driver->type == TTY_DRIVER_TYPE_PTY && | |
915 | tty->driver->subtype == PTY_TYPE_MASTER) | |
916 | real_tty = tty->link; | |
917 | else | |
918 | real_tty = tty; | |
919 | ||
920 | switch (cmd) { | |
355d95a1 AC |
921 | case TCXONC: |
922 | retval = tty_check_change(tty); | |
923 | if (retval) | |
924 | return retval; | |
925 | switch (arg) { | |
926 | case TCOOFF: | |
927 | if (!tty->flow_stopped) { | |
928 | tty->flow_stopped = 1; | |
929 | stop_tty(tty); | |
1da177e4 | 930 | } |
355d95a1 AC |
931 | break; |
932 | case TCOON: | |
933 | if (tty->flow_stopped) { | |
934 | tty->flow_stopped = 0; | |
935 | start_tty(tty); | |
936 | } | |
937 | break; | |
938 | case TCIOFF: | |
939 | if (STOP_CHAR(tty) != __DISABLED_CHAR) | |
940 | return send_prio_char(tty, STOP_CHAR(tty)); | |
941 | break; | |
942 | case TCION: | |
943 | if (START_CHAR(tty) != __DISABLED_CHAR) | |
944 | return send_prio_char(tty, START_CHAR(tty)); | |
945 | break; | |
1da177e4 | 946 | default: |
355d95a1 | 947 | return -EINVAL; |
1da177e4 | 948 | } |
355d95a1 AC |
949 | return 0; |
950 | case TCFLSH: | |
951 | return tty_perform_flush(tty, arg); | |
952 | case TIOCOUTQ: | |
953 | return put_user(tty->driver->chars_in_buffer ? | |
954 | tty->driver->chars_in_buffer(tty) : 0, | |
955 | (int __user *) arg); | |
956 | case TIOCINQ: | |
957 | retval = tty->read_cnt; | |
958 | if (L_ICANON(tty)) | |
959 | retval = inq_canon(tty); | |
960 | return put_user(retval, (unsigned int __user *) arg); | |
961 | case TIOCPKT: | |
962 | { | |
963 | int pktmode; | |
964 | ||
965 | if (tty->driver->type != TTY_DRIVER_TYPE_PTY || | |
966 | tty->driver->subtype != PTY_TYPE_MASTER) | |
967 | return -ENOTTY; | |
968 | if (get_user(pktmode, (int __user *) arg)) | |
969 | return -EFAULT; | |
04f378b1 | 970 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
355d95a1 AC |
971 | if (pktmode) { |
972 | if (!tty->packet) { | |
973 | tty->packet = 1; | |
974 | tty->link->ctrl_status = 0; | |
975 | } | |
976 | } else | |
977 | tty->packet = 0; | |
04f378b1 | 978 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
355d95a1 AC |
979 | return 0; |
980 | } | |
981 | default: | |
982 | /* Try the mode commands */ | |
983 | return tty_mode_ioctl(tty, file, cmd, arg); | |
984 | } | |
1da177e4 | 985 | } |
1da177e4 | 986 | EXPORT_SYMBOL(n_tty_ioctl); |