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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 | ||
1da177e4 LT |
53 | void tty_wait_until_sent(struct tty_struct * tty, long timeout) |
54 | { | |
1da177e4 LT |
55 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT |
56 | char buf[64]; | |
57 | ||
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 JS |
64 | if (wait_event_interruptible_timeout(tty->write_wait, |
65 | !tty->driver->chars_in_buffer(tty), timeout)) | |
66 | return; | |
1da177e4 LT |
67 | if (tty->driver->wait_until_sent) |
68 | tty->driver->wait_until_sent(tty, timeout); | |
1da177e4 LT |
69 | } |
70 | ||
71 | EXPORT_SYMBOL(tty_wait_until_sent); | |
72 | ||
edc6afc5 AC |
73 | static void unset_locked_termios(struct ktermios *termios, |
74 | struct ktermios *old, | |
75 | struct ktermios *locked) | |
1da177e4 LT |
76 | { |
77 | int i; | |
78 | ||
79 | #define NOSET_MASK(x,y,z) (x = ((x) & ~(z)) | ((y) & (z))) | |
80 | ||
81 | if (!locked) { | |
82 | printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n"); | |
83 | return; | |
84 | } | |
85 | ||
86 | NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag); | |
87 | NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag); | |
88 | NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag); | |
89 | NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag); | |
90 | termios->c_line = locked->c_line ? old->c_line : termios->c_line; | |
91 | for (i=0; i < NCCS; i++) | |
92 | termios->c_cc[i] = locked->c_cc[i] ? | |
93 | old->c_cc[i] : termios->c_cc[i]; | |
edc6afc5 | 94 | /* FIXME: What should we do for i/ospeed */ |
1da177e4 LT |
95 | } |
96 | ||
edc6afc5 AC |
97 | /* |
98 | * Routine which returns the baud rate of the tty | |
99 | * | |
100 | * Note that the baud_table needs to be kept in sync with the | |
101 | * include/asm/termbits.h file. | |
102 | */ | |
103 | static const speed_t baud_table[] = { | |
104 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
105 | 9600, 19200, 38400, 57600, 115200, 230400, 460800, | |
106 | #ifdef __sparc__ | |
107 | 76800, 153600, 307200, 614400, 921600 | |
108 | #else | |
109 | 500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000, | |
110 | 2500000, 3000000, 3500000, 4000000 | |
111 | #endif | |
112 | }; | |
113 | ||
114 | #ifndef __sparc__ | |
115 | static const tcflag_t baud_bits[] = { | |
116 | B0, B50, B75, B110, B134, B150, B200, B300, B600, | |
117 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, | |
118 | B57600, B115200, B230400, B460800, B500000, B576000, | |
119 | B921600, B1000000, B1152000, B1500000, B2000000, B2500000, | |
120 | B3000000, B3500000, B4000000 | |
121 | }; | |
122 | #else | |
123 | static const tcflag_t baud_bits[] = { | |
124 | B0, B50, B75, B110, B134, B150, B200, B300, B600, | |
125 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, | |
126 | B57600, B115200, B230400, B460800, B76800, B153600, | |
127 | B307200, B614400, B921600 | |
128 | }; | |
129 | #endif | |
130 | ||
131 | static int n_baud_table = ARRAY_SIZE(baud_table); | |
132 | ||
133 | /** | |
134 | * tty_termios_baud_rate | |
135 | * @termios: termios structure | |
136 | * | |
137 | * Convert termios baud rate data into a speed. This should be called | |
138 | * with the termios lock held if this termios is a terminal termios | |
139 | * structure. May change the termios data. Device drivers can call this | |
140 | * function but should use ->c_[io]speed directly as they are updated. | |
141 | * | |
142 | * Locking: none | |
143 | */ | |
144 | ||
145 | speed_t tty_termios_baud_rate(struct ktermios *termios) | |
146 | { | |
147 | unsigned int cbaud; | |
148 | ||
149 | cbaud = termios->c_cflag & CBAUD; | |
150 | ||
151 | #ifdef BOTHER | |
152 | /* Magic token for arbitary speed via c_ispeed/c_ospeed */ | |
153 | if (cbaud == BOTHER) | |
154 | return termios->c_ospeed; | |
155 | #endif | |
156 | if (cbaud & CBAUDEX) { | |
157 | cbaud &= ~CBAUDEX; | |
158 | ||
159 | if (cbaud < 1 || cbaud + 15 > n_baud_table) | |
160 | termios->c_cflag &= ~CBAUDEX; | |
161 | else | |
162 | cbaud += 15; | |
163 | } | |
164 | return baud_table[cbaud]; | |
165 | } | |
166 | ||
167 | EXPORT_SYMBOL(tty_termios_baud_rate); | |
168 | ||
169 | /** | |
170 | * tty_termios_input_baud_rate | |
171 | * @termios: termios structure | |
172 | * | |
173 | * Convert termios baud rate data into a speed. This should be called | |
174 | * with the termios lock held if this termios is a terminal termios | |
175 | * structure. May change the termios data. Device drivers can call this | |
176 | * function but should use ->c_[io]speed directly as they are updated. | |
177 | * | |
178 | * Locking: none | |
179 | */ | |
180 | ||
181 | speed_t tty_termios_input_baud_rate(struct ktermios *termios) | |
182 | { | |
183 | #ifdef IBSHIFT | |
184 | unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD; | |
185 | ||
186 | if (cbaud == B0) | |
187 | return tty_termios_baud_rate(termios); | |
188 | ||
189 | /* Magic token for arbitary speed via c_ispeed*/ | |
190 | if (cbaud == BOTHER) | |
191 | return termios->c_ispeed; | |
192 | ||
193 | if (cbaud & CBAUDEX) { | |
194 | cbaud &= ~CBAUDEX; | |
195 | ||
196 | if (cbaud < 1 || cbaud + 15 > n_baud_table) | |
197 | termios->c_cflag &= ~(CBAUDEX << IBSHIFT); | |
198 | else | |
199 | cbaud += 15; | |
200 | } | |
201 | return baud_table[cbaud]; | |
202 | #else | |
203 | return tty_termios_baud_rate(termios); | |
204 | #endif | |
205 | } | |
206 | ||
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 | } | |
341 | ||
342 | EXPORT_SYMBOL(tty_get_baud_rate); | |
343 | ||
5f519d72 AC |
344 | /** |
345 | * tty_termios_copy_hw - copy hardware settings | |
346 | * @new: New termios | |
347 | * @old: Old termios | |
348 | * | |
349 | * Propogate the hardware specific terminal setting bits from | |
350 | * the old termios structure to the new one. This is used in cases | |
351 | * where the hardware does not support reconfiguration or as a helper | |
352 | * in some cases where only minimal reconfiguration is supported | |
353 | */ | |
354 | ||
355 | void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old) | |
356 | { | |
357 | /* The bits a dumb device handles in software. Smart devices need | |
358 | to always provide a set_termios method */ | |
359 | new->c_cflag &= HUPCL | CREAD | CLOCAL; | |
360 | new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL); | |
361 | new->c_ispeed = old->c_ispeed; | |
362 | new->c_ospeed = old->c_ospeed; | |
363 | } | |
364 | ||
365 | EXPORT_SYMBOL(tty_termios_copy_hw); | |
366 | ||
af9b897e AC |
367 | /** |
368 | * change_termios - update termios values | |
369 | * @tty: tty to update | |
370 | * @new_termios: desired new value | |
371 | * | |
372 | * Perform updates to the termios values set on this terminal. There | |
373 | * is a bit of layering violation here with n_tty in terms of the | |
374 | * internal knowledge of this function. | |
375 | * | |
376 | * Locking: termios_sem | |
377 | */ | |
378 | ||
edc6afc5 | 379 | static void change_termios(struct tty_struct * tty, struct ktermios * new_termios) |
1da177e4 LT |
380 | { |
381 | int canon_change; | |
edc6afc5 | 382 | struct ktermios old_termios = *tty->termios; |
1da177e4 LT |
383 | struct tty_ldisc *ld; |
384 | ||
385 | /* | |
386 | * Perform the actual termios internal changes under lock. | |
387 | */ | |
388 | ||
389 | ||
390 | /* FIXME: we need to decide on some locking/ordering semantics | |
391 | for the set_termios notification eventually */ | |
5785c95b | 392 | mutex_lock(&tty->termios_mutex); |
1da177e4 LT |
393 | |
394 | *tty->termios = *new_termios; | |
395 | unset_locked_termios(tty->termios, &old_termios, tty->termios_locked); | |
396 | canon_change = (old_termios.c_lflag ^ tty->termios->c_lflag) & ICANON; | |
397 | if (canon_change) { | |
398 | memset(&tty->read_flags, 0, sizeof tty->read_flags); | |
399 | tty->canon_head = tty->read_tail; | |
400 | tty->canon_data = 0; | |
401 | tty->erasing = 0; | |
402 | } | |
403 | ||
5f519d72 | 404 | /* This bit should be in the ldisc code */ |
1da177e4 LT |
405 | if (canon_change && !L_ICANON(tty) && tty->read_cnt) |
406 | /* Get characters left over from canonical mode. */ | |
407 | wake_up_interruptible(&tty->read_wait); | |
408 | ||
409 | /* See if packet mode change of state. */ | |
1da177e4 LT |
410 | if (tty->link && tty->link->packet) { |
411 | int old_flow = ((old_termios.c_iflag & IXON) && | |
412 | (old_termios.c_cc[VSTOP] == '\023') && | |
413 | (old_termios.c_cc[VSTART] == '\021')); | |
414 | int new_flow = (I_IXON(tty) && | |
415 | STOP_CHAR(tty) == '\023' && | |
416 | START_CHAR(tty) == '\021'); | |
417 | if (old_flow != new_flow) { | |
418 | tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); | |
419 | if (new_flow) | |
420 | tty->ctrl_status |= TIOCPKT_DOSTOP; | |
421 | else | |
422 | tty->ctrl_status |= TIOCPKT_NOSTOP; | |
423 | wake_up_interruptible(&tty->link->read_wait); | |
424 | } | |
425 | } | |
426 | ||
427 | if (tty->driver->set_termios) | |
428 | (*tty->driver->set_termios)(tty, &old_termios); | |
5f519d72 AC |
429 | else |
430 | tty_termios_copy_hw(tty->termios, &old_termios); | |
1da177e4 LT |
431 | |
432 | ld = tty_ldisc_ref(tty); | |
433 | if (ld != NULL) { | |
434 | if (ld->set_termios) | |
435 | (ld->set_termios)(tty, &old_termios); | |
436 | tty_ldisc_deref(ld); | |
437 | } | |
5785c95b | 438 | mutex_unlock(&tty->termios_mutex); |
1da177e4 LT |
439 | } |
440 | ||
af9b897e AC |
441 | /** |
442 | * set_termios - set termios values for a tty | |
443 | * @tty: terminal device | |
444 | * @arg: user data | |
445 | * @opt: option information | |
446 | * | |
447 | * Helper function to prepare termios data and run neccessary other | |
448 | * functions before using change_termios to do the actual changes. | |
449 | * | |
450 | * Locking: | |
451 | * Called functions take ldisc and termios_sem locks | |
452 | */ | |
453 | ||
1da177e4 LT |
454 | static int set_termios(struct tty_struct * tty, void __user *arg, int opt) |
455 | { | |
edc6afc5 | 456 | struct ktermios tmp_termios; |
1da177e4 LT |
457 | struct tty_ldisc *ld; |
458 | int retval = tty_check_change(tty); | |
459 | ||
460 | if (retval) | |
461 | return retval; | |
462 | ||
64bb6c5e AC |
463 | memcpy(&tmp_termios, tty->termios, sizeof(struct ktermios)); |
464 | ||
1da177e4 | 465 | if (opt & TERMIOS_TERMIO) { |
1da177e4 LT |
466 | if (user_termio_to_kernel_termios(&tmp_termios, |
467 | (struct termio __user *)arg)) | |
468 | return -EFAULT; | |
edc6afc5 AC |
469 | #ifdef TCGETS2 |
470 | } else if (opt & TERMIOS_OLD) { | |
edc6afc5 | 471 | if (user_termios_to_kernel_termios_1(&tmp_termios, |
64bb6c5e | 472 | (struct termios __user *)arg)) |
edc6afc5 | 473 | return -EFAULT; |
1da177e4 LT |
474 | } else { |
475 | if (user_termios_to_kernel_termios(&tmp_termios, | |
64bb6c5e | 476 | (struct termios2 __user *)arg)) |
1da177e4 LT |
477 | return -EFAULT; |
478 | } | |
64bb6c5e AC |
479 | #else |
480 | } else if (user_termios_to_kernel_termios(&tmp_termios, | |
481 | (struct termios __user *)arg)) | |
482 | return -EFAULT; | |
483 | #endif | |
1da177e4 | 484 | |
edc6afc5 AC |
485 | /* If old style Bfoo values are used then load c_ispeed/c_ospeed with the real speed |
486 | so its unconditionally usable */ | |
487 | tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios); | |
488 | tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios); | |
489 | ||
1da177e4 LT |
490 | ld = tty_ldisc_ref(tty); |
491 | ||
492 | if (ld != NULL) { | |
493 | if ((opt & TERMIOS_FLUSH) && ld->flush_buffer) | |
494 | ld->flush_buffer(tty); | |
495 | tty_ldisc_deref(ld); | |
496 | } | |
497 | ||
498 | if (opt & TERMIOS_WAIT) { | |
499 | tty_wait_until_sent(tty, 0); | |
500 | if (signal_pending(current)) | |
501 | return -EINTR; | |
502 | } | |
503 | ||
504 | change_termios(tty, &tmp_termios); | |
5f519d72 AC |
505 | |
506 | /* FIXME: Arguably if tmp_termios == tty->termios AND the | |
507 | actual requested termios was not tmp_termios then we may | |
508 | want to return an error as no user requested change has | |
509 | succeeded */ | |
1da177e4 LT |
510 | return 0; |
511 | } | |
512 | ||
513 | static int get_termio(struct tty_struct * tty, struct termio __user * termio) | |
514 | { | |
515 | if (kernel_termios_to_user_termio(termio, tty->termios)) | |
516 | return -EFAULT; | |
517 | return 0; | |
518 | } | |
519 | ||
520 | static unsigned long inq_canon(struct tty_struct * tty) | |
521 | { | |
522 | int nr, head, tail; | |
523 | ||
524 | if (!tty->canon_data || !tty->read_buf) | |
525 | return 0; | |
526 | head = tty->canon_head; | |
527 | tail = tty->read_tail; | |
528 | nr = (head - tail) & (N_TTY_BUF_SIZE-1); | |
529 | /* Skip EOF-chars.. */ | |
530 | while (head != tail) { | |
531 | if (test_bit(tail, tty->read_flags) && | |
532 | tty->read_buf[tail] == __DISABLED_CHAR) | |
533 | nr--; | |
534 | tail = (tail+1) & (N_TTY_BUF_SIZE-1); | |
535 | } | |
536 | return nr; | |
537 | } | |
538 | ||
539 | #ifdef TIOCGETP | |
540 | /* | |
541 | * These are deprecated, but there is limited support.. | |
542 | * | |
543 | * The "sg_flags" translation is a joke.. | |
544 | */ | |
545 | static int get_sgflags(struct tty_struct * tty) | |
546 | { | |
547 | int flags = 0; | |
548 | ||
549 | if (!(tty->termios->c_lflag & ICANON)) { | |
550 | if (tty->termios->c_lflag & ISIG) | |
551 | flags |= 0x02; /* cbreak */ | |
552 | else | |
553 | flags |= 0x20; /* raw */ | |
554 | } | |
555 | if (tty->termios->c_lflag & ECHO) | |
556 | flags |= 0x08; /* echo */ | |
557 | if (tty->termios->c_oflag & OPOST) | |
558 | if (tty->termios->c_oflag & ONLCR) | |
559 | flags |= 0x10; /* crmod */ | |
560 | return flags; | |
561 | } | |
562 | ||
563 | static int get_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb) | |
564 | { | |
565 | struct sgttyb tmp; | |
566 | ||
5785c95b | 567 | mutex_lock(&tty->termios_mutex); |
606d099c AC |
568 | tmp.sg_ispeed = tty->termios->c_ispeed; |
569 | tmp.sg_ospeed = tty->termios->c_ospeed; | |
1da177e4 LT |
570 | tmp.sg_erase = tty->termios->c_cc[VERASE]; |
571 | tmp.sg_kill = tty->termios->c_cc[VKILL]; | |
572 | tmp.sg_flags = get_sgflags(tty); | |
5785c95b | 573 | mutex_unlock(&tty->termios_mutex); |
1da177e4 LT |
574 | |
575 | return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
576 | } | |
577 | ||
edc6afc5 | 578 | static void set_sgflags(struct ktermios * termios, int flags) |
1da177e4 LT |
579 | { |
580 | termios->c_iflag = ICRNL | IXON; | |
581 | termios->c_oflag = 0; | |
582 | termios->c_lflag = ISIG | ICANON; | |
583 | if (flags & 0x02) { /* cbreak */ | |
584 | termios->c_iflag = 0; | |
585 | termios->c_lflag &= ~ICANON; | |
586 | } | |
587 | if (flags & 0x08) { /* echo */ | |
588 | termios->c_lflag |= ECHO | ECHOE | ECHOK | | |
589 | ECHOCTL | ECHOKE | IEXTEN; | |
590 | } | |
591 | if (flags & 0x10) { /* crmod */ | |
592 | termios->c_oflag |= OPOST | ONLCR; | |
593 | } | |
594 | if (flags & 0x20) { /* raw */ | |
595 | termios->c_iflag = 0; | |
596 | termios->c_lflag &= ~(ISIG | ICANON); | |
597 | } | |
598 | if (!(termios->c_lflag & ICANON)) { | |
599 | termios->c_cc[VMIN] = 1; | |
600 | termios->c_cc[VTIME] = 0; | |
601 | } | |
602 | } | |
603 | ||
af9b897e AC |
604 | /** |
605 | * set_sgttyb - set legacy terminal values | |
606 | * @tty: tty structure | |
607 | * @sgttyb: pointer to old style terminal structure | |
608 | * | |
609 | * Updates a terminal from the legacy BSD style terminal information | |
610 | * structure. | |
611 | * | |
612 | * Locking: termios_sem | |
613 | */ | |
614 | ||
1da177e4 LT |
615 | static int set_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb) |
616 | { | |
617 | int retval; | |
618 | struct sgttyb tmp; | |
edc6afc5 | 619 | struct ktermios termios; |
1da177e4 LT |
620 | |
621 | retval = tty_check_change(tty); | |
622 | if (retval) | |
623 | return retval; | |
624 | ||
625 | if (copy_from_user(&tmp, sgttyb, sizeof(tmp))) | |
626 | return -EFAULT; | |
627 | ||
5785c95b | 628 | mutex_lock(&tty->termios_mutex); |
6804396f | 629 | termios = *tty->termios; |
1da177e4 LT |
630 | termios.c_cc[VERASE] = tmp.sg_erase; |
631 | termios.c_cc[VKILL] = tmp.sg_kill; | |
632 | set_sgflags(&termios, tmp.sg_flags); | |
edc6afc5 AC |
633 | /* Try and encode into Bfoo format */ |
634 | #ifdef BOTHER | |
635 | tty_termios_encode_baud_rate(&termios, termios.c_ispeed, termios.c_ospeed); | |
636 | #endif | |
5785c95b | 637 | mutex_unlock(&tty->termios_mutex); |
1da177e4 LT |
638 | change_termios(tty, &termios); |
639 | return 0; | |
640 | } | |
641 | #endif | |
642 | ||
643 | #ifdef TIOCGETC | |
644 | static int get_tchars(struct tty_struct * tty, struct tchars __user * tchars) | |
645 | { | |
646 | struct tchars tmp; | |
647 | ||
648 | tmp.t_intrc = tty->termios->c_cc[VINTR]; | |
649 | tmp.t_quitc = tty->termios->c_cc[VQUIT]; | |
650 | tmp.t_startc = tty->termios->c_cc[VSTART]; | |
651 | tmp.t_stopc = tty->termios->c_cc[VSTOP]; | |
652 | tmp.t_eofc = tty->termios->c_cc[VEOF]; | |
653 | tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */ | |
654 | return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
655 | } | |
656 | ||
657 | static int set_tchars(struct tty_struct * tty, struct tchars __user * tchars) | |
658 | { | |
659 | struct tchars tmp; | |
660 | ||
661 | if (copy_from_user(&tmp, tchars, sizeof(tmp))) | |
662 | return -EFAULT; | |
663 | tty->termios->c_cc[VINTR] = tmp.t_intrc; | |
664 | tty->termios->c_cc[VQUIT] = tmp.t_quitc; | |
665 | tty->termios->c_cc[VSTART] = tmp.t_startc; | |
666 | tty->termios->c_cc[VSTOP] = tmp.t_stopc; | |
667 | tty->termios->c_cc[VEOF] = tmp.t_eofc; | |
668 | tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */ | |
669 | return 0; | |
670 | } | |
671 | #endif | |
672 | ||
673 | #ifdef TIOCGLTC | |
674 | static int get_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars) | |
675 | { | |
676 | struct ltchars tmp; | |
677 | ||
678 | tmp.t_suspc = tty->termios->c_cc[VSUSP]; | |
679 | tmp.t_dsuspc = tty->termios->c_cc[VSUSP]; /* what is dsuspc anyway? */ | |
680 | tmp.t_rprntc = tty->termios->c_cc[VREPRINT]; | |
681 | tmp.t_flushc = tty->termios->c_cc[VEOL2]; /* what is flushc anyway? */ | |
682 | tmp.t_werasc = tty->termios->c_cc[VWERASE]; | |
683 | tmp.t_lnextc = tty->termios->c_cc[VLNEXT]; | |
684 | return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
685 | } | |
686 | ||
687 | static int set_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars) | |
688 | { | |
689 | struct ltchars tmp; | |
690 | ||
691 | if (copy_from_user(&tmp, ltchars, sizeof(tmp))) | |
692 | return -EFAULT; | |
693 | ||
694 | tty->termios->c_cc[VSUSP] = tmp.t_suspc; | |
695 | tty->termios->c_cc[VEOL2] = tmp.t_dsuspc; /* what is dsuspc anyway? */ | |
696 | tty->termios->c_cc[VREPRINT] = tmp.t_rprntc; | |
697 | tty->termios->c_cc[VEOL2] = tmp.t_flushc; /* what is flushc anyway? */ | |
698 | tty->termios->c_cc[VWERASE] = tmp.t_werasc; | |
699 | tty->termios->c_cc[VLNEXT] = tmp.t_lnextc; | |
700 | return 0; | |
701 | } | |
702 | #endif | |
703 | ||
af9b897e AC |
704 | /** |
705 | * send_prio_char - send priority character | |
706 | * | |
707 | * Send a high priority character to the tty even if stopped | |
708 | * | |
5f412b24 | 709 | * Locking: none for xchar method, write ordering for write method. |
1da177e4 | 710 | */ |
af9b897e | 711 | |
5f412b24 | 712 | static int send_prio_char(struct tty_struct *tty, char ch) |
1da177e4 LT |
713 | { |
714 | int was_stopped = tty->stopped; | |
715 | ||
716 | if (tty->driver->send_xchar) { | |
717 | tty->driver->send_xchar(tty, ch); | |
5f412b24 | 718 | return 0; |
1da177e4 | 719 | } |
5f412b24 | 720 | |
9c1729db | 721 | if (tty_write_lock(tty, 0) < 0) |
5f412b24 AC |
722 | return -ERESTARTSYS; |
723 | ||
1da177e4 LT |
724 | if (was_stopped) |
725 | start_tty(tty); | |
726 | tty->driver->write(tty, &ch, 1); | |
727 | if (was_stopped) | |
728 | stop_tty(tty); | |
9c1729db | 729 | tty_write_unlock(tty); |
5f412b24 | 730 | return 0; |
1da177e4 LT |
731 | } |
732 | ||
733 | int n_tty_ioctl(struct tty_struct * tty, struct file * file, | |
734 | unsigned int cmd, unsigned long arg) | |
735 | { | |
736 | struct tty_struct * real_tty; | |
737 | void __user *p = (void __user *)arg; | |
738 | int retval; | |
739 | struct tty_ldisc *ld; | |
740 | ||
741 | if (tty->driver->type == TTY_DRIVER_TYPE_PTY && | |
742 | tty->driver->subtype == PTY_TYPE_MASTER) | |
743 | real_tty = tty->link; | |
744 | else | |
745 | real_tty = tty; | |
746 | ||
747 | switch (cmd) { | |
748 | #ifdef TIOCGETP | |
749 | case TIOCGETP: | |
750 | return get_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
751 | case TIOCSETP: | |
752 | case TIOCSETN: | |
753 | return set_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
754 | #endif | |
755 | #ifdef TIOCGETC | |
756 | case TIOCGETC: | |
757 | return get_tchars(real_tty, p); | |
758 | case TIOCSETC: | |
759 | return set_tchars(real_tty, p); | |
760 | #endif | |
761 | #ifdef TIOCGLTC | |
762 | case TIOCGLTC: | |
763 | return get_ltchars(real_tty, p); | |
764 | case TIOCSLTC: | |
765 | return set_ltchars(real_tty, p); | |
766 | #endif | |
edc6afc5 AC |
767 | case TCSETSF: |
768 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD); | |
769 | case TCSETSW: | |
770 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD); | |
771 | case TCSETS: | |
772 | return set_termios(real_tty, p, TERMIOS_OLD); | |
773 | #ifndef TCGETS2 | |
1da177e4 LT |
774 | case TCGETS: |
775 | if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios)) | |
776 | return -EFAULT; | |
777 | return 0; | |
edc6afc5 AC |
778 | #else |
779 | case TCGETS: | |
64bb6c5e | 780 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios)) |
edc6afc5 AC |
781 | return -EFAULT; |
782 | return 0; | |
783 | case TCGETS2: | |
64bb6c5e | 784 | if (kernel_termios_to_user_termios((struct termios2 __user *)arg, real_tty->termios)) |
edc6afc5 AC |
785 | return -EFAULT; |
786 | return 0; | |
787 | case TCSETSF2: | |
1da177e4 | 788 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT); |
edc6afc5 | 789 | case TCSETSW2: |
1da177e4 | 790 | return set_termios(real_tty, p, TERMIOS_WAIT); |
edc6afc5 | 791 | case TCSETS2: |
1da177e4 | 792 | return set_termios(real_tty, p, 0); |
edc6afc5 | 793 | #endif |
1da177e4 LT |
794 | case TCGETA: |
795 | return get_termio(real_tty, p); | |
796 | case TCSETAF: | |
797 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO); | |
798 | case TCSETAW: | |
799 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO); | |
800 | case TCSETA: | |
801 | return set_termios(real_tty, p, TERMIOS_TERMIO); | |
802 | case TCXONC: | |
803 | retval = tty_check_change(tty); | |
804 | if (retval) | |
805 | return retval; | |
806 | switch (arg) { | |
807 | case TCOOFF: | |
808 | if (!tty->flow_stopped) { | |
809 | tty->flow_stopped = 1; | |
810 | stop_tty(tty); | |
811 | } | |
812 | break; | |
813 | case TCOON: | |
814 | if (tty->flow_stopped) { | |
815 | tty->flow_stopped = 0; | |
816 | start_tty(tty); | |
817 | } | |
818 | break; | |
819 | case TCIOFF: | |
820 | if (STOP_CHAR(tty) != __DISABLED_CHAR) | |
5f412b24 | 821 | return send_prio_char(tty, STOP_CHAR(tty)); |
1da177e4 LT |
822 | break; |
823 | case TCION: | |
824 | if (START_CHAR(tty) != __DISABLED_CHAR) | |
5f412b24 | 825 | return send_prio_char(tty, START_CHAR(tty)); |
1da177e4 LT |
826 | break; |
827 | default: | |
828 | return -EINVAL; | |
829 | } | |
830 | return 0; | |
831 | case TCFLSH: | |
832 | retval = tty_check_change(tty); | |
833 | if (retval) | |
834 | return retval; | |
835 | ||
836 | ld = tty_ldisc_ref(tty); | |
837 | switch (arg) { | |
838 | case TCIFLUSH: | |
69f63c5c | 839 | if (ld && ld->flush_buffer) |
1da177e4 LT |
840 | ld->flush_buffer(tty); |
841 | break; | |
842 | case TCIOFLUSH: | |
69f63c5c | 843 | if (ld && ld->flush_buffer) |
1da177e4 LT |
844 | ld->flush_buffer(tty); |
845 | /* fall through */ | |
846 | case TCOFLUSH: | |
847 | if (tty->driver->flush_buffer) | |
848 | tty->driver->flush_buffer(tty); | |
849 | break; | |
850 | default: | |
851 | tty_ldisc_deref(ld); | |
852 | return -EINVAL; | |
853 | } | |
854 | tty_ldisc_deref(ld); | |
855 | return 0; | |
856 | case TIOCOUTQ: | |
857 | return put_user(tty->driver->chars_in_buffer ? | |
858 | tty->driver->chars_in_buffer(tty) : 0, | |
859 | (int __user *) arg); | |
860 | case TIOCINQ: | |
861 | retval = tty->read_cnt; | |
862 | if (L_ICANON(tty)) | |
863 | retval = inq_canon(tty); | |
864 | return put_user(retval, (unsigned int __user *) arg); | |
bb8bd3a5 TB |
865 | #ifndef TCGETS2 |
866 | case TIOCGLCKTRMIOS: | |
867 | if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked)) | |
868 | return -EFAULT; | |
869 | return 0; | |
870 | ||
871 | case TIOCSLCKTRMIOS: | |
872 | if (!capable(CAP_SYS_ADMIN)) | |
873 | return -EPERM; | |
874 | if (user_termios_to_kernel_termios(real_tty->termios_locked, (struct termios __user *) arg)) | |
875 | return -EFAULT; | |
876 | return 0; | |
877 | #else | |
1da177e4 | 878 | case TIOCGLCKTRMIOS: |
f629307c | 879 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios_locked)) |
1da177e4 LT |
880 | return -EFAULT; |
881 | return 0; | |
882 | ||
883 | case TIOCSLCKTRMIOS: | |
884 | if (!capable(CAP_SYS_ADMIN)) | |
885 | return -EPERM; | |
f629307c | 886 | if (user_termios_to_kernel_termios_1(real_tty->termios_locked, (struct termios __user *) arg)) |
1da177e4 LT |
887 | return -EFAULT; |
888 | return 0; | |
bb8bd3a5 | 889 | #endif |
1da177e4 LT |
890 | |
891 | case TIOCPKT: | |
892 | { | |
893 | int pktmode; | |
894 | ||
895 | if (tty->driver->type != TTY_DRIVER_TYPE_PTY || | |
896 | tty->driver->subtype != PTY_TYPE_MASTER) | |
897 | return -ENOTTY; | |
898 | if (get_user(pktmode, (int __user *) arg)) | |
899 | return -EFAULT; | |
900 | if (pktmode) { | |
901 | if (!tty->packet) { | |
902 | tty->packet = 1; | |
903 | tty->link->ctrl_status = 0; | |
904 | } | |
905 | } else | |
906 | tty->packet = 0; | |
907 | return 0; | |
908 | } | |
909 | case TIOCGSOFTCAR: | |
910 | return put_user(C_CLOCAL(tty) ? 1 : 0, (int __user *)arg); | |
911 | case TIOCSSOFTCAR: | |
912 | if (get_user(arg, (unsigned int __user *) arg)) | |
913 | return -EFAULT; | |
5785c95b | 914 | mutex_lock(&tty->termios_mutex); |
1da177e4 LT |
915 | tty->termios->c_cflag = |
916 | ((tty->termios->c_cflag & ~CLOCAL) | | |
917 | (arg ? CLOCAL : 0)); | |
5785c95b | 918 | mutex_unlock(&tty->termios_mutex); |
1da177e4 LT |
919 | return 0; |
920 | default: | |
921 | return -ENOIOCTLCMD; | |
922 | } | |
923 | } | |
924 | ||
925 | EXPORT_SYMBOL(n_tty_ioctl); |