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> |
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 | |
39 | ||
af9b897e AC |
40 | |
41 | /** | |
42 | * tty_wait_until_sent - wait for I/O to finish | |
43 | * @tty: tty we are waiting for | |
44 | * @timeout: how long we will wait | |
45 | * | |
46 | * Wait for characters pending in a tty driver to hit the wire, or | |
47 | * for a timeout to occur (eg due to flow control) | |
48 | * | |
49 | * Locking: none | |
50 | */ | |
51 | ||
1da177e4 LT |
52 | void tty_wait_until_sent(struct tty_struct * tty, long timeout) |
53 | { | |
54 | DECLARE_WAITQUEUE(wait, current); | |
55 | ||
56 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT | |
57 | char buf[64]; | |
58 | ||
59 | printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf)); | |
60 | #endif | |
61 | if (!tty->driver->chars_in_buffer) | |
62 | return; | |
63 | add_wait_queue(&tty->write_wait, &wait); | |
64 | if (!timeout) | |
65 | timeout = MAX_SCHEDULE_TIMEOUT; | |
66 | do { | |
67 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT | |
68 | printk(KERN_DEBUG "waiting %s...(%d)\n", tty_name(tty, buf), | |
69 | tty->driver->chars_in_buffer(tty)); | |
70 | #endif | |
71 | set_current_state(TASK_INTERRUPTIBLE); | |
72 | if (signal_pending(current)) | |
73 | goto stop_waiting; | |
74 | if (!tty->driver->chars_in_buffer(tty)) | |
75 | break; | |
76 | timeout = schedule_timeout(timeout); | |
77 | } while (timeout); | |
78 | if (tty->driver->wait_until_sent) | |
79 | tty->driver->wait_until_sent(tty, timeout); | |
80 | stop_waiting: | |
81 | set_current_state(TASK_RUNNING); | |
82 | remove_wait_queue(&tty->write_wait, &wait); | |
83 | } | |
84 | ||
85 | EXPORT_SYMBOL(tty_wait_until_sent); | |
86 | ||
87 | static void unset_locked_termios(struct termios *termios, | |
88 | struct termios *old, | |
89 | struct termios *locked) | |
90 | { | |
91 | int i; | |
92 | ||
93 | #define NOSET_MASK(x,y,z) (x = ((x) & ~(z)) | ((y) & (z))) | |
94 | ||
95 | if (!locked) { | |
96 | printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n"); | |
97 | return; | |
98 | } | |
99 | ||
100 | NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag); | |
101 | NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag); | |
102 | NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag); | |
103 | NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag); | |
104 | termios->c_line = locked->c_line ? old->c_line : termios->c_line; | |
105 | for (i=0; i < NCCS; i++) | |
106 | termios->c_cc[i] = locked->c_cc[i] ? | |
107 | old->c_cc[i] : termios->c_cc[i]; | |
108 | } | |
109 | ||
af9b897e AC |
110 | /** |
111 | * change_termios - update termios values | |
112 | * @tty: tty to update | |
113 | * @new_termios: desired new value | |
114 | * | |
115 | * Perform updates to the termios values set on this terminal. There | |
116 | * is a bit of layering violation here with n_tty in terms of the | |
117 | * internal knowledge of this function. | |
118 | * | |
119 | * Locking: termios_sem | |
120 | */ | |
121 | ||
1da177e4 LT |
122 | static void change_termios(struct tty_struct * tty, struct termios * new_termios) |
123 | { | |
124 | int canon_change; | |
125 | struct termios old_termios = *tty->termios; | |
126 | struct tty_ldisc *ld; | |
127 | ||
128 | /* | |
129 | * Perform the actual termios internal changes under lock. | |
130 | */ | |
131 | ||
132 | ||
133 | /* FIXME: we need to decide on some locking/ordering semantics | |
134 | for the set_termios notification eventually */ | |
5785c95b | 135 | mutex_lock(&tty->termios_mutex); |
1da177e4 LT |
136 | |
137 | *tty->termios = *new_termios; | |
138 | unset_locked_termios(tty->termios, &old_termios, tty->termios_locked); | |
139 | canon_change = (old_termios.c_lflag ^ tty->termios->c_lflag) & ICANON; | |
140 | if (canon_change) { | |
141 | memset(&tty->read_flags, 0, sizeof tty->read_flags); | |
142 | tty->canon_head = tty->read_tail; | |
143 | tty->canon_data = 0; | |
144 | tty->erasing = 0; | |
145 | } | |
146 | ||
147 | ||
148 | if (canon_change && !L_ICANON(tty) && tty->read_cnt) | |
149 | /* Get characters left over from canonical mode. */ | |
150 | wake_up_interruptible(&tty->read_wait); | |
151 | ||
152 | /* See if packet mode change of state. */ | |
153 | ||
154 | if (tty->link && tty->link->packet) { | |
155 | int old_flow = ((old_termios.c_iflag & IXON) && | |
156 | (old_termios.c_cc[VSTOP] == '\023') && | |
157 | (old_termios.c_cc[VSTART] == '\021')); | |
158 | int new_flow = (I_IXON(tty) && | |
159 | STOP_CHAR(tty) == '\023' && | |
160 | START_CHAR(tty) == '\021'); | |
161 | if (old_flow != new_flow) { | |
162 | tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); | |
163 | if (new_flow) | |
164 | tty->ctrl_status |= TIOCPKT_DOSTOP; | |
165 | else | |
166 | tty->ctrl_status |= TIOCPKT_NOSTOP; | |
167 | wake_up_interruptible(&tty->link->read_wait); | |
168 | } | |
169 | } | |
170 | ||
171 | if (tty->driver->set_termios) | |
172 | (*tty->driver->set_termios)(tty, &old_termios); | |
173 | ||
174 | ld = tty_ldisc_ref(tty); | |
175 | if (ld != NULL) { | |
176 | if (ld->set_termios) | |
177 | (ld->set_termios)(tty, &old_termios); | |
178 | tty_ldisc_deref(ld); | |
179 | } | |
5785c95b | 180 | mutex_unlock(&tty->termios_mutex); |
1da177e4 LT |
181 | } |
182 | ||
af9b897e AC |
183 | /** |
184 | * set_termios - set termios values for a tty | |
185 | * @tty: terminal device | |
186 | * @arg: user data | |
187 | * @opt: option information | |
188 | * | |
189 | * Helper function to prepare termios data and run neccessary other | |
190 | * functions before using change_termios to do the actual changes. | |
191 | * | |
192 | * Locking: | |
193 | * Called functions take ldisc and termios_sem locks | |
194 | */ | |
195 | ||
1da177e4 LT |
196 | static int set_termios(struct tty_struct * tty, void __user *arg, int opt) |
197 | { | |
198 | struct termios tmp_termios; | |
199 | struct tty_ldisc *ld; | |
200 | int retval = tty_check_change(tty); | |
201 | ||
202 | if (retval) | |
203 | return retval; | |
204 | ||
205 | if (opt & TERMIOS_TERMIO) { | |
206 | memcpy(&tmp_termios, tty->termios, sizeof(struct termios)); | |
207 | if (user_termio_to_kernel_termios(&tmp_termios, | |
208 | (struct termio __user *)arg)) | |
209 | return -EFAULT; | |
210 | } else { | |
211 | if (user_termios_to_kernel_termios(&tmp_termios, | |
212 | (struct termios __user *)arg)) | |
213 | return -EFAULT; | |
214 | } | |
215 | ||
216 | ld = tty_ldisc_ref(tty); | |
217 | ||
218 | if (ld != NULL) { | |
219 | if ((opt & TERMIOS_FLUSH) && ld->flush_buffer) | |
220 | ld->flush_buffer(tty); | |
221 | tty_ldisc_deref(ld); | |
222 | } | |
223 | ||
224 | if (opt & TERMIOS_WAIT) { | |
225 | tty_wait_until_sent(tty, 0); | |
226 | if (signal_pending(current)) | |
227 | return -EINTR; | |
228 | } | |
229 | ||
230 | change_termios(tty, &tmp_termios); | |
231 | return 0; | |
232 | } | |
233 | ||
234 | static int get_termio(struct tty_struct * tty, struct termio __user * termio) | |
235 | { | |
236 | if (kernel_termios_to_user_termio(termio, tty->termios)) | |
237 | return -EFAULT; | |
238 | return 0; | |
239 | } | |
240 | ||
241 | static unsigned long inq_canon(struct tty_struct * tty) | |
242 | { | |
243 | int nr, head, tail; | |
244 | ||
245 | if (!tty->canon_data || !tty->read_buf) | |
246 | return 0; | |
247 | head = tty->canon_head; | |
248 | tail = tty->read_tail; | |
249 | nr = (head - tail) & (N_TTY_BUF_SIZE-1); | |
250 | /* Skip EOF-chars.. */ | |
251 | while (head != tail) { | |
252 | if (test_bit(tail, tty->read_flags) && | |
253 | tty->read_buf[tail] == __DISABLED_CHAR) | |
254 | nr--; | |
255 | tail = (tail+1) & (N_TTY_BUF_SIZE-1); | |
256 | } | |
257 | return nr; | |
258 | } | |
259 | ||
260 | #ifdef TIOCGETP | |
261 | /* | |
262 | * These are deprecated, but there is limited support.. | |
263 | * | |
264 | * The "sg_flags" translation is a joke.. | |
265 | */ | |
266 | static int get_sgflags(struct tty_struct * tty) | |
267 | { | |
268 | int flags = 0; | |
269 | ||
270 | if (!(tty->termios->c_lflag & ICANON)) { | |
271 | if (tty->termios->c_lflag & ISIG) | |
272 | flags |= 0x02; /* cbreak */ | |
273 | else | |
274 | flags |= 0x20; /* raw */ | |
275 | } | |
276 | if (tty->termios->c_lflag & ECHO) | |
277 | flags |= 0x08; /* echo */ | |
278 | if (tty->termios->c_oflag & OPOST) | |
279 | if (tty->termios->c_oflag & ONLCR) | |
280 | flags |= 0x10; /* crmod */ | |
281 | return flags; | |
282 | } | |
283 | ||
284 | static int get_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb) | |
285 | { | |
286 | struct sgttyb tmp; | |
287 | ||
5785c95b | 288 | mutex_lock(&tty->termios_mutex); |
1da177e4 LT |
289 | tmp.sg_ispeed = 0; |
290 | tmp.sg_ospeed = 0; | |
291 | tmp.sg_erase = tty->termios->c_cc[VERASE]; | |
292 | tmp.sg_kill = tty->termios->c_cc[VKILL]; | |
293 | tmp.sg_flags = get_sgflags(tty); | |
5785c95b | 294 | mutex_unlock(&tty->termios_mutex); |
1da177e4 LT |
295 | |
296 | return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
297 | } | |
298 | ||
299 | static void set_sgflags(struct termios * termios, int flags) | |
300 | { | |
301 | termios->c_iflag = ICRNL | IXON; | |
302 | termios->c_oflag = 0; | |
303 | termios->c_lflag = ISIG | ICANON; | |
304 | if (flags & 0x02) { /* cbreak */ | |
305 | termios->c_iflag = 0; | |
306 | termios->c_lflag &= ~ICANON; | |
307 | } | |
308 | if (flags & 0x08) { /* echo */ | |
309 | termios->c_lflag |= ECHO | ECHOE | ECHOK | | |
310 | ECHOCTL | ECHOKE | IEXTEN; | |
311 | } | |
312 | if (flags & 0x10) { /* crmod */ | |
313 | termios->c_oflag |= OPOST | ONLCR; | |
314 | } | |
315 | if (flags & 0x20) { /* raw */ | |
316 | termios->c_iflag = 0; | |
317 | termios->c_lflag &= ~(ISIG | ICANON); | |
318 | } | |
319 | if (!(termios->c_lflag & ICANON)) { | |
320 | termios->c_cc[VMIN] = 1; | |
321 | termios->c_cc[VTIME] = 0; | |
322 | } | |
323 | } | |
324 | ||
af9b897e AC |
325 | /** |
326 | * set_sgttyb - set legacy terminal values | |
327 | * @tty: tty structure | |
328 | * @sgttyb: pointer to old style terminal structure | |
329 | * | |
330 | * Updates a terminal from the legacy BSD style terminal information | |
331 | * structure. | |
332 | * | |
333 | * Locking: termios_sem | |
334 | */ | |
335 | ||
1da177e4 LT |
336 | static int set_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb) |
337 | { | |
338 | int retval; | |
339 | struct sgttyb tmp; | |
340 | struct termios termios; | |
341 | ||
342 | retval = tty_check_change(tty); | |
343 | if (retval) | |
344 | return retval; | |
345 | ||
346 | if (copy_from_user(&tmp, sgttyb, sizeof(tmp))) | |
347 | return -EFAULT; | |
348 | ||
5785c95b | 349 | mutex_lock(&tty->termios_mutex); |
1da177e4 LT |
350 | termios = *tty->termios; |
351 | termios.c_cc[VERASE] = tmp.sg_erase; | |
352 | termios.c_cc[VKILL] = tmp.sg_kill; | |
353 | set_sgflags(&termios, tmp.sg_flags); | |
5785c95b | 354 | mutex_unlock(&tty->termios_mutex); |
1da177e4 LT |
355 | change_termios(tty, &termios); |
356 | return 0; | |
357 | } | |
358 | #endif | |
359 | ||
360 | #ifdef TIOCGETC | |
361 | static int get_tchars(struct tty_struct * tty, struct tchars __user * tchars) | |
362 | { | |
363 | struct tchars tmp; | |
364 | ||
365 | tmp.t_intrc = tty->termios->c_cc[VINTR]; | |
366 | tmp.t_quitc = tty->termios->c_cc[VQUIT]; | |
367 | tmp.t_startc = tty->termios->c_cc[VSTART]; | |
368 | tmp.t_stopc = tty->termios->c_cc[VSTOP]; | |
369 | tmp.t_eofc = tty->termios->c_cc[VEOF]; | |
370 | tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */ | |
371 | return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
372 | } | |
373 | ||
374 | static int set_tchars(struct tty_struct * tty, struct tchars __user * tchars) | |
375 | { | |
376 | struct tchars tmp; | |
377 | ||
378 | if (copy_from_user(&tmp, tchars, sizeof(tmp))) | |
379 | return -EFAULT; | |
380 | tty->termios->c_cc[VINTR] = tmp.t_intrc; | |
381 | tty->termios->c_cc[VQUIT] = tmp.t_quitc; | |
382 | tty->termios->c_cc[VSTART] = tmp.t_startc; | |
383 | tty->termios->c_cc[VSTOP] = tmp.t_stopc; | |
384 | tty->termios->c_cc[VEOF] = tmp.t_eofc; | |
385 | tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */ | |
386 | return 0; | |
387 | } | |
388 | #endif | |
389 | ||
390 | #ifdef TIOCGLTC | |
391 | static int get_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars) | |
392 | { | |
393 | struct ltchars tmp; | |
394 | ||
395 | tmp.t_suspc = tty->termios->c_cc[VSUSP]; | |
396 | tmp.t_dsuspc = tty->termios->c_cc[VSUSP]; /* what is dsuspc anyway? */ | |
397 | tmp.t_rprntc = tty->termios->c_cc[VREPRINT]; | |
398 | tmp.t_flushc = tty->termios->c_cc[VEOL2]; /* what is flushc anyway? */ | |
399 | tmp.t_werasc = tty->termios->c_cc[VWERASE]; | |
400 | tmp.t_lnextc = tty->termios->c_cc[VLNEXT]; | |
401 | return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
402 | } | |
403 | ||
404 | static int set_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars) | |
405 | { | |
406 | struct ltchars tmp; | |
407 | ||
408 | if (copy_from_user(&tmp, ltchars, sizeof(tmp))) | |
409 | return -EFAULT; | |
410 | ||
411 | tty->termios->c_cc[VSUSP] = tmp.t_suspc; | |
412 | tty->termios->c_cc[VEOL2] = tmp.t_dsuspc; /* what is dsuspc anyway? */ | |
413 | tty->termios->c_cc[VREPRINT] = tmp.t_rprntc; | |
414 | tty->termios->c_cc[VEOL2] = tmp.t_flushc; /* what is flushc anyway? */ | |
415 | tty->termios->c_cc[VWERASE] = tmp.t_werasc; | |
416 | tty->termios->c_cc[VLNEXT] = tmp.t_lnextc; | |
417 | return 0; | |
418 | } | |
419 | #endif | |
420 | ||
af9b897e AC |
421 | /** |
422 | * send_prio_char - send priority character | |
423 | * | |
424 | * Send a high priority character to the tty even if stopped | |
425 | * | |
426 | * Locking: none | |
427 | * | |
428 | * FIXME: overlapping calls with start/stop tty lose state of tty | |
1da177e4 | 429 | */ |
af9b897e | 430 | |
1da177e4 LT |
431 | static void send_prio_char(struct tty_struct *tty, char ch) |
432 | { | |
433 | int was_stopped = tty->stopped; | |
434 | ||
435 | if (tty->driver->send_xchar) { | |
436 | tty->driver->send_xchar(tty, ch); | |
437 | return; | |
438 | } | |
439 | if (was_stopped) | |
440 | start_tty(tty); | |
441 | tty->driver->write(tty, &ch, 1); | |
442 | if (was_stopped) | |
443 | stop_tty(tty); | |
444 | } | |
445 | ||
446 | int n_tty_ioctl(struct tty_struct * tty, struct file * file, | |
447 | unsigned int cmd, unsigned long arg) | |
448 | { | |
449 | struct tty_struct * real_tty; | |
450 | void __user *p = (void __user *)arg; | |
451 | int retval; | |
452 | struct tty_ldisc *ld; | |
453 | ||
454 | if (tty->driver->type == TTY_DRIVER_TYPE_PTY && | |
455 | tty->driver->subtype == PTY_TYPE_MASTER) | |
456 | real_tty = tty->link; | |
457 | else | |
458 | real_tty = tty; | |
459 | ||
460 | switch (cmd) { | |
461 | #ifdef TIOCGETP | |
462 | case TIOCGETP: | |
463 | return get_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
464 | case TIOCSETP: | |
465 | case TIOCSETN: | |
466 | return set_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
467 | #endif | |
468 | #ifdef TIOCGETC | |
469 | case TIOCGETC: | |
470 | return get_tchars(real_tty, p); | |
471 | case TIOCSETC: | |
472 | return set_tchars(real_tty, p); | |
473 | #endif | |
474 | #ifdef TIOCGLTC | |
475 | case TIOCGLTC: | |
476 | return get_ltchars(real_tty, p); | |
477 | case TIOCSLTC: | |
478 | return set_ltchars(real_tty, p); | |
479 | #endif | |
480 | case TCGETS: | |
481 | if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios)) | |
482 | return -EFAULT; | |
483 | return 0; | |
484 | case TCSETSF: | |
485 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT); | |
486 | case TCSETSW: | |
487 | return set_termios(real_tty, p, TERMIOS_WAIT); | |
488 | case TCSETS: | |
489 | return set_termios(real_tty, p, 0); | |
490 | case TCGETA: | |
491 | return get_termio(real_tty, p); | |
492 | case TCSETAF: | |
493 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO); | |
494 | case TCSETAW: | |
495 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO); | |
496 | case TCSETA: | |
497 | return set_termios(real_tty, p, TERMIOS_TERMIO); | |
498 | case TCXONC: | |
499 | retval = tty_check_change(tty); | |
500 | if (retval) | |
501 | return retval; | |
502 | switch (arg) { | |
503 | case TCOOFF: | |
504 | if (!tty->flow_stopped) { | |
505 | tty->flow_stopped = 1; | |
506 | stop_tty(tty); | |
507 | } | |
508 | break; | |
509 | case TCOON: | |
510 | if (tty->flow_stopped) { | |
511 | tty->flow_stopped = 0; | |
512 | start_tty(tty); | |
513 | } | |
514 | break; | |
515 | case TCIOFF: | |
516 | if (STOP_CHAR(tty) != __DISABLED_CHAR) | |
517 | send_prio_char(tty, STOP_CHAR(tty)); | |
518 | break; | |
519 | case TCION: | |
520 | if (START_CHAR(tty) != __DISABLED_CHAR) | |
521 | send_prio_char(tty, START_CHAR(tty)); | |
522 | break; | |
523 | default: | |
524 | return -EINVAL; | |
525 | } | |
526 | return 0; | |
527 | case TCFLSH: | |
528 | retval = tty_check_change(tty); | |
529 | if (retval) | |
530 | return retval; | |
531 | ||
532 | ld = tty_ldisc_ref(tty); | |
533 | switch (arg) { | |
534 | case TCIFLUSH: | |
69f63c5c | 535 | if (ld && ld->flush_buffer) |
1da177e4 LT |
536 | ld->flush_buffer(tty); |
537 | break; | |
538 | case TCIOFLUSH: | |
69f63c5c | 539 | if (ld && ld->flush_buffer) |
1da177e4 LT |
540 | ld->flush_buffer(tty); |
541 | /* fall through */ | |
542 | case TCOFLUSH: | |
543 | if (tty->driver->flush_buffer) | |
544 | tty->driver->flush_buffer(tty); | |
545 | break; | |
546 | default: | |
547 | tty_ldisc_deref(ld); | |
548 | return -EINVAL; | |
549 | } | |
550 | tty_ldisc_deref(ld); | |
551 | return 0; | |
552 | case TIOCOUTQ: | |
553 | return put_user(tty->driver->chars_in_buffer ? | |
554 | tty->driver->chars_in_buffer(tty) : 0, | |
555 | (int __user *) arg); | |
556 | case TIOCINQ: | |
557 | retval = tty->read_cnt; | |
558 | if (L_ICANON(tty)) | |
559 | retval = inq_canon(tty); | |
560 | return put_user(retval, (unsigned int __user *) arg); | |
561 | case TIOCGLCKTRMIOS: | |
562 | if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked)) | |
563 | return -EFAULT; | |
564 | return 0; | |
565 | ||
566 | case TIOCSLCKTRMIOS: | |
567 | if (!capable(CAP_SYS_ADMIN)) | |
568 | return -EPERM; | |
569 | if (user_termios_to_kernel_termios(real_tty->termios_locked, (struct termios __user *) arg)) | |
570 | return -EFAULT; | |
571 | return 0; | |
572 | ||
573 | case TIOCPKT: | |
574 | { | |
575 | int pktmode; | |
576 | ||
577 | if (tty->driver->type != TTY_DRIVER_TYPE_PTY || | |
578 | tty->driver->subtype != PTY_TYPE_MASTER) | |
579 | return -ENOTTY; | |
580 | if (get_user(pktmode, (int __user *) arg)) | |
581 | return -EFAULT; | |
582 | if (pktmode) { | |
583 | if (!tty->packet) { | |
584 | tty->packet = 1; | |
585 | tty->link->ctrl_status = 0; | |
586 | } | |
587 | } else | |
588 | tty->packet = 0; | |
589 | return 0; | |
590 | } | |
591 | case TIOCGSOFTCAR: | |
592 | return put_user(C_CLOCAL(tty) ? 1 : 0, (int __user *)arg); | |
593 | case TIOCSSOFTCAR: | |
594 | if (get_user(arg, (unsigned int __user *) arg)) | |
595 | return -EFAULT; | |
5785c95b | 596 | mutex_lock(&tty->termios_mutex); |
1da177e4 LT |
597 | tty->termios->c_cflag = |
598 | ((tty->termios->c_cflag & ~CLOCAL) | | |
599 | (arg ? CLOCAL : 0)); | |
5785c95b | 600 | mutex_unlock(&tty->termios_mutex); |
1da177e4 LT |
601 | return 0; |
602 | default: | |
603 | return -ENOIOCTLCMD; | |
604 | } | |
605 | } | |
606 | ||
607 | EXPORT_SYMBOL(n_tty_ioctl); |