Commit | Line | Data |
---|---|---|
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> | |
23 | ||
24 | #include <asm/io.h> | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/system.h> | |
27 | ||
28 | #undef TTY_DEBUG_WAIT_UNTIL_SENT | |
29 | ||
30 | #undef DEBUG | |
31 | ||
32 | /* | |
33 | * Internal flag options for termios setting behavior | |
34 | */ | |
35 | #define TERMIOS_FLUSH 1 | |
36 | #define TERMIOS_WAIT 2 | |
37 | #define TERMIOS_TERMIO 4 | |
38 | ||
39 | void tty_wait_until_sent(struct tty_struct * tty, long timeout) | |
40 | { | |
41 | DECLARE_WAITQUEUE(wait, current); | |
42 | ||
43 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT | |
44 | char buf[64]; | |
45 | ||
46 | printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf)); | |
47 | #endif | |
48 | if (!tty->driver->chars_in_buffer) | |
49 | return; | |
50 | add_wait_queue(&tty->write_wait, &wait); | |
51 | if (!timeout) | |
52 | timeout = MAX_SCHEDULE_TIMEOUT; | |
53 | do { | |
54 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT | |
55 | printk(KERN_DEBUG "waiting %s...(%d)\n", tty_name(tty, buf), | |
56 | tty->driver->chars_in_buffer(tty)); | |
57 | #endif | |
58 | set_current_state(TASK_INTERRUPTIBLE); | |
59 | if (signal_pending(current)) | |
60 | goto stop_waiting; | |
61 | if (!tty->driver->chars_in_buffer(tty)) | |
62 | break; | |
63 | timeout = schedule_timeout(timeout); | |
64 | } while (timeout); | |
65 | if (tty->driver->wait_until_sent) | |
66 | tty->driver->wait_until_sent(tty, timeout); | |
67 | stop_waiting: | |
68 | set_current_state(TASK_RUNNING); | |
69 | remove_wait_queue(&tty->write_wait, &wait); | |
70 | } | |
71 | ||
72 | EXPORT_SYMBOL(tty_wait_until_sent); | |
73 | ||
74 | static void unset_locked_termios(struct termios *termios, | |
75 | struct termios *old, | |
76 | struct termios *locked) | |
77 | { | |
78 | int i; | |
79 | ||
80 | #define NOSET_MASK(x,y,z) (x = ((x) & ~(z)) | ((y) & (z))) | |
81 | ||
82 | if (!locked) { | |
83 | printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n"); | |
84 | return; | |
85 | } | |
86 | ||
87 | NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag); | |
88 | NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag); | |
89 | NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag); | |
90 | NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag); | |
91 | termios->c_line = locked->c_line ? old->c_line : termios->c_line; | |
92 | for (i=0; i < NCCS; i++) | |
93 | termios->c_cc[i] = locked->c_cc[i] ? | |
94 | old->c_cc[i] : termios->c_cc[i]; | |
95 | } | |
96 | ||
97 | static void change_termios(struct tty_struct * tty, struct termios * new_termios) | |
98 | { | |
99 | int canon_change; | |
100 | struct termios old_termios = *tty->termios; | |
101 | struct tty_ldisc *ld; | |
102 | ||
103 | /* | |
104 | * Perform the actual termios internal changes under lock. | |
105 | */ | |
106 | ||
107 | ||
108 | /* FIXME: we need to decide on some locking/ordering semantics | |
109 | for the set_termios notification eventually */ | |
110 | down(&tty->termios_sem); | |
111 | ||
112 | *tty->termios = *new_termios; | |
113 | unset_locked_termios(tty->termios, &old_termios, tty->termios_locked); | |
114 | canon_change = (old_termios.c_lflag ^ tty->termios->c_lflag) & ICANON; | |
115 | if (canon_change) { | |
116 | memset(&tty->read_flags, 0, sizeof tty->read_flags); | |
117 | tty->canon_head = tty->read_tail; | |
118 | tty->canon_data = 0; | |
119 | tty->erasing = 0; | |
120 | } | |
121 | ||
122 | ||
123 | if (canon_change && !L_ICANON(tty) && tty->read_cnt) | |
124 | /* Get characters left over from canonical mode. */ | |
125 | wake_up_interruptible(&tty->read_wait); | |
126 | ||
127 | /* See if packet mode change of state. */ | |
128 | ||
129 | if (tty->link && tty->link->packet) { | |
130 | int old_flow = ((old_termios.c_iflag & IXON) && | |
131 | (old_termios.c_cc[VSTOP] == '\023') && | |
132 | (old_termios.c_cc[VSTART] == '\021')); | |
133 | int new_flow = (I_IXON(tty) && | |
134 | STOP_CHAR(tty) == '\023' && | |
135 | START_CHAR(tty) == '\021'); | |
136 | if (old_flow != new_flow) { | |
137 | tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); | |
138 | if (new_flow) | |
139 | tty->ctrl_status |= TIOCPKT_DOSTOP; | |
140 | else | |
141 | tty->ctrl_status |= TIOCPKT_NOSTOP; | |
142 | wake_up_interruptible(&tty->link->read_wait); | |
143 | } | |
144 | } | |
145 | ||
146 | if (tty->driver->set_termios) | |
147 | (*tty->driver->set_termios)(tty, &old_termios); | |
148 | ||
149 | ld = tty_ldisc_ref(tty); | |
150 | if (ld != NULL) { | |
151 | if (ld->set_termios) | |
152 | (ld->set_termios)(tty, &old_termios); | |
153 | tty_ldisc_deref(ld); | |
154 | } | |
155 | up(&tty->termios_sem); | |
156 | } | |
157 | ||
158 | static int set_termios(struct tty_struct * tty, void __user *arg, int opt) | |
159 | { | |
160 | struct termios tmp_termios; | |
161 | struct tty_ldisc *ld; | |
162 | int retval = tty_check_change(tty); | |
163 | ||
164 | if (retval) | |
165 | return retval; | |
166 | ||
167 | if (opt & TERMIOS_TERMIO) { | |
168 | memcpy(&tmp_termios, tty->termios, sizeof(struct termios)); | |
169 | if (user_termio_to_kernel_termios(&tmp_termios, | |
170 | (struct termio __user *)arg)) | |
171 | return -EFAULT; | |
172 | } else { | |
173 | if (user_termios_to_kernel_termios(&tmp_termios, | |
174 | (struct termios __user *)arg)) | |
175 | return -EFAULT; | |
176 | } | |
177 | ||
178 | ld = tty_ldisc_ref(tty); | |
179 | ||
180 | if (ld != NULL) { | |
181 | if ((opt & TERMIOS_FLUSH) && ld->flush_buffer) | |
182 | ld->flush_buffer(tty); | |
183 | tty_ldisc_deref(ld); | |
184 | } | |
185 | ||
186 | if (opt & TERMIOS_WAIT) { | |
187 | tty_wait_until_sent(tty, 0); | |
188 | if (signal_pending(current)) | |
189 | return -EINTR; | |
190 | } | |
191 | ||
192 | change_termios(tty, &tmp_termios); | |
193 | return 0; | |
194 | } | |
195 | ||
196 | static int get_termio(struct tty_struct * tty, struct termio __user * termio) | |
197 | { | |
198 | if (kernel_termios_to_user_termio(termio, tty->termios)) | |
199 | return -EFAULT; | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static unsigned long inq_canon(struct tty_struct * tty) | |
204 | { | |
205 | int nr, head, tail; | |
206 | ||
207 | if (!tty->canon_data || !tty->read_buf) | |
208 | return 0; | |
209 | head = tty->canon_head; | |
210 | tail = tty->read_tail; | |
211 | nr = (head - tail) & (N_TTY_BUF_SIZE-1); | |
212 | /* Skip EOF-chars.. */ | |
213 | while (head != tail) { | |
214 | if (test_bit(tail, tty->read_flags) && | |
215 | tty->read_buf[tail] == __DISABLED_CHAR) | |
216 | nr--; | |
217 | tail = (tail+1) & (N_TTY_BUF_SIZE-1); | |
218 | } | |
219 | return nr; | |
220 | } | |
221 | ||
222 | #ifdef TIOCGETP | |
223 | /* | |
224 | * These are deprecated, but there is limited support.. | |
225 | * | |
226 | * The "sg_flags" translation is a joke.. | |
227 | */ | |
228 | static int get_sgflags(struct tty_struct * tty) | |
229 | { | |
230 | int flags = 0; | |
231 | ||
232 | if (!(tty->termios->c_lflag & ICANON)) { | |
233 | if (tty->termios->c_lflag & ISIG) | |
234 | flags |= 0x02; /* cbreak */ | |
235 | else | |
236 | flags |= 0x20; /* raw */ | |
237 | } | |
238 | if (tty->termios->c_lflag & ECHO) | |
239 | flags |= 0x08; /* echo */ | |
240 | if (tty->termios->c_oflag & OPOST) | |
241 | if (tty->termios->c_oflag & ONLCR) | |
242 | flags |= 0x10; /* crmod */ | |
243 | return flags; | |
244 | } | |
245 | ||
246 | static int get_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb) | |
247 | { | |
248 | struct sgttyb tmp; | |
249 | ||
250 | down(&tty->termios_sem); | |
251 | tmp.sg_ispeed = 0; | |
252 | tmp.sg_ospeed = 0; | |
253 | tmp.sg_erase = tty->termios->c_cc[VERASE]; | |
254 | tmp.sg_kill = tty->termios->c_cc[VKILL]; | |
255 | tmp.sg_flags = get_sgflags(tty); | |
256 | up(&tty->termios_sem); | |
257 | ||
258 | return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
259 | } | |
260 | ||
261 | static void set_sgflags(struct termios * termios, int flags) | |
262 | { | |
263 | termios->c_iflag = ICRNL | IXON; | |
264 | termios->c_oflag = 0; | |
265 | termios->c_lflag = ISIG | ICANON; | |
266 | if (flags & 0x02) { /* cbreak */ | |
267 | termios->c_iflag = 0; | |
268 | termios->c_lflag &= ~ICANON; | |
269 | } | |
270 | if (flags & 0x08) { /* echo */ | |
271 | termios->c_lflag |= ECHO | ECHOE | ECHOK | | |
272 | ECHOCTL | ECHOKE | IEXTEN; | |
273 | } | |
274 | if (flags & 0x10) { /* crmod */ | |
275 | termios->c_oflag |= OPOST | ONLCR; | |
276 | } | |
277 | if (flags & 0x20) { /* raw */ | |
278 | termios->c_iflag = 0; | |
279 | termios->c_lflag &= ~(ISIG | ICANON); | |
280 | } | |
281 | if (!(termios->c_lflag & ICANON)) { | |
282 | termios->c_cc[VMIN] = 1; | |
283 | termios->c_cc[VTIME] = 0; | |
284 | } | |
285 | } | |
286 | ||
287 | static int set_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb) | |
288 | { | |
289 | int retval; | |
290 | struct sgttyb tmp; | |
291 | struct termios termios; | |
292 | ||
293 | retval = tty_check_change(tty); | |
294 | if (retval) | |
295 | return retval; | |
296 | ||
297 | if (copy_from_user(&tmp, sgttyb, sizeof(tmp))) | |
298 | return -EFAULT; | |
299 | ||
300 | down(&tty->termios_sem); | |
301 | termios = *tty->termios; | |
302 | termios.c_cc[VERASE] = tmp.sg_erase; | |
303 | termios.c_cc[VKILL] = tmp.sg_kill; | |
304 | set_sgflags(&termios, tmp.sg_flags); | |
305 | up(&tty->termios_sem); | |
306 | change_termios(tty, &termios); | |
307 | return 0; | |
308 | } | |
309 | #endif | |
310 | ||
311 | #ifdef TIOCGETC | |
312 | static int get_tchars(struct tty_struct * tty, struct tchars __user * tchars) | |
313 | { | |
314 | struct tchars tmp; | |
315 | ||
316 | tmp.t_intrc = tty->termios->c_cc[VINTR]; | |
317 | tmp.t_quitc = tty->termios->c_cc[VQUIT]; | |
318 | tmp.t_startc = tty->termios->c_cc[VSTART]; | |
319 | tmp.t_stopc = tty->termios->c_cc[VSTOP]; | |
320 | tmp.t_eofc = tty->termios->c_cc[VEOF]; | |
321 | tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */ | |
322 | return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
323 | } | |
324 | ||
325 | static int set_tchars(struct tty_struct * tty, struct tchars __user * tchars) | |
326 | { | |
327 | struct tchars tmp; | |
328 | ||
329 | if (copy_from_user(&tmp, tchars, sizeof(tmp))) | |
330 | return -EFAULT; | |
331 | tty->termios->c_cc[VINTR] = tmp.t_intrc; | |
332 | tty->termios->c_cc[VQUIT] = tmp.t_quitc; | |
333 | tty->termios->c_cc[VSTART] = tmp.t_startc; | |
334 | tty->termios->c_cc[VSTOP] = tmp.t_stopc; | |
335 | tty->termios->c_cc[VEOF] = tmp.t_eofc; | |
336 | tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */ | |
337 | return 0; | |
338 | } | |
339 | #endif | |
340 | ||
341 | #ifdef TIOCGLTC | |
342 | static int get_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars) | |
343 | { | |
344 | struct ltchars tmp; | |
345 | ||
346 | tmp.t_suspc = tty->termios->c_cc[VSUSP]; | |
347 | tmp.t_dsuspc = tty->termios->c_cc[VSUSP]; /* what is dsuspc anyway? */ | |
348 | tmp.t_rprntc = tty->termios->c_cc[VREPRINT]; | |
349 | tmp.t_flushc = tty->termios->c_cc[VEOL2]; /* what is flushc anyway? */ | |
350 | tmp.t_werasc = tty->termios->c_cc[VWERASE]; | |
351 | tmp.t_lnextc = tty->termios->c_cc[VLNEXT]; | |
352 | return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; | |
353 | } | |
354 | ||
355 | static int set_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars) | |
356 | { | |
357 | struct ltchars tmp; | |
358 | ||
359 | if (copy_from_user(&tmp, ltchars, sizeof(tmp))) | |
360 | return -EFAULT; | |
361 | ||
362 | tty->termios->c_cc[VSUSP] = tmp.t_suspc; | |
363 | tty->termios->c_cc[VEOL2] = tmp.t_dsuspc; /* what is dsuspc anyway? */ | |
364 | tty->termios->c_cc[VREPRINT] = tmp.t_rprntc; | |
365 | tty->termios->c_cc[VEOL2] = tmp.t_flushc; /* what is flushc anyway? */ | |
366 | tty->termios->c_cc[VWERASE] = tmp.t_werasc; | |
367 | tty->termios->c_cc[VLNEXT] = tmp.t_lnextc; | |
368 | return 0; | |
369 | } | |
370 | #endif | |
371 | ||
372 | /* | |
373 | * Send a high priority character to the tty. | |
374 | */ | |
375 | static void send_prio_char(struct tty_struct *tty, char ch) | |
376 | { | |
377 | int was_stopped = tty->stopped; | |
378 | ||
379 | if (tty->driver->send_xchar) { | |
380 | tty->driver->send_xchar(tty, ch); | |
381 | return; | |
382 | } | |
383 | if (was_stopped) | |
384 | start_tty(tty); | |
385 | tty->driver->write(tty, &ch, 1); | |
386 | if (was_stopped) | |
387 | stop_tty(tty); | |
388 | } | |
389 | ||
390 | int n_tty_ioctl(struct tty_struct * tty, struct file * file, | |
391 | unsigned int cmd, unsigned long arg) | |
392 | { | |
393 | struct tty_struct * real_tty; | |
394 | void __user *p = (void __user *)arg; | |
395 | int retval; | |
396 | struct tty_ldisc *ld; | |
397 | ||
398 | if (tty->driver->type == TTY_DRIVER_TYPE_PTY && | |
399 | tty->driver->subtype == PTY_TYPE_MASTER) | |
400 | real_tty = tty->link; | |
401 | else | |
402 | real_tty = tty; | |
403 | ||
404 | switch (cmd) { | |
405 | #ifdef TIOCGETP | |
406 | case TIOCGETP: | |
407 | return get_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
408 | case TIOCSETP: | |
409 | case TIOCSETN: | |
410 | return set_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
411 | #endif | |
412 | #ifdef TIOCGETC | |
413 | case TIOCGETC: | |
414 | return get_tchars(real_tty, p); | |
415 | case TIOCSETC: | |
416 | return set_tchars(real_tty, p); | |
417 | #endif | |
418 | #ifdef TIOCGLTC | |
419 | case TIOCGLTC: | |
420 | return get_ltchars(real_tty, p); | |
421 | case TIOCSLTC: | |
422 | return set_ltchars(real_tty, p); | |
423 | #endif | |
424 | case TCGETS: | |
425 | if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios)) | |
426 | return -EFAULT; | |
427 | return 0; | |
428 | case TCSETSF: | |
429 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT); | |
430 | case TCSETSW: | |
431 | return set_termios(real_tty, p, TERMIOS_WAIT); | |
432 | case TCSETS: | |
433 | return set_termios(real_tty, p, 0); | |
434 | case TCGETA: | |
435 | return get_termio(real_tty, p); | |
436 | case TCSETAF: | |
437 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO); | |
438 | case TCSETAW: | |
439 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO); | |
440 | case TCSETA: | |
441 | return set_termios(real_tty, p, TERMIOS_TERMIO); | |
442 | case TCXONC: | |
443 | retval = tty_check_change(tty); | |
444 | if (retval) | |
445 | return retval; | |
446 | switch (arg) { | |
447 | case TCOOFF: | |
448 | if (!tty->flow_stopped) { | |
449 | tty->flow_stopped = 1; | |
450 | stop_tty(tty); | |
451 | } | |
452 | break; | |
453 | case TCOON: | |
454 | if (tty->flow_stopped) { | |
455 | tty->flow_stopped = 0; | |
456 | start_tty(tty); | |
457 | } | |
458 | break; | |
459 | case TCIOFF: | |
460 | if (STOP_CHAR(tty) != __DISABLED_CHAR) | |
461 | send_prio_char(tty, STOP_CHAR(tty)); | |
462 | break; | |
463 | case TCION: | |
464 | if (START_CHAR(tty) != __DISABLED_CHAR) | |
465 | send_prio_char(tty, START_CHAR(tty)); | |
466 | break; | |
467 | default: | |
468 | return -EINVAL; | |
469 | } | |
470 | return 0; | |
471 | case TCFLSH: | |
472 | retval = tty_check_change(tty); | |
473 | if (retval) | |
474 | return retval; | |
475 | ||
476 | ld = tty_ldisc_ref(tty); | |
477 | switch (arg) { | |
478 | case TCIFLUSH: | |
69f63c5c | 479 | if (ld && ld->flush_buffer) |
1da177e4 LT |
480 | ld->flush_buffer(tty); |
481 | break; | |
482 | case TCIOFLUSH: | |
69f63c5c | 483 | if (ld && ld->flush_buffer) |
1da177e4 LT |
484 | ld->flush_buffer(tty); |
485 | /* fall through */ | |
486 | case TCOFLUSH: | |
487 | if (tty->driver->flush_buffer) | |
488 | tty->driver->flush_buffer(tty); | |
489 | break; | |
490 | default: | |
491 | tty_ldisc_deref(ld); | |
492 | return -EINVAL; | |
493 | } | |
494 | tty_ldisc_deref(ld); | |
495 | return 0; | |
496 | case TIOCOUTQ: | |
497 | return put_user(tty->driver->chars_in_buffer ? | |
498 | tty->driver->chars_in_buffer(tty) : 0, | |
499 | (int __user *) arg); | |
500 | case TIOCINQ: | |
501 | retval = tty->read_cnt; | |
502 | if (L_ICANON(tty)) | |
503 | retval = inq_canon(tty); | |
504 | return put_user(retval, (unsigned int __user *) arg); | |
505 | case TIOCGLCKTRMIOS: | |
506 | if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked)) | |
507 | return -EFAULT; | |
508 | return 0; | |
509 | ||
510 | case TIOCSLCKTRMIOS: | |
511 | if (!capable(CAP_SYS_ADMIN)) | |
512 | return -EPERM; | |
513 | if (user_termios_to_kernel_termios(real_tty->termios_locked, (struct termios __user *) arg)) | |
514 | return -EFAULT; | |
515 | return 0; | |
516 | ||
517 | case TIOCPKT: | |
518 | { | |
519 | int pktmode; | |
520 | ||
521 | if (tty->driver->type != TTY_DRIVER_TYPE_PTY || | |
522 | tty->driver->subtype != PTY_TYPE_MASTER) | |
523 | return -ENOTTY; | |
524 | if (get_user(pktmode, (int __user *) arg)) | |
525 | return -EFAULT; | |
526 | if (pktmode) { | |
527 | if (!tty->packet) { | |
528 | tty->packet = 1; | |
529 | tty->link->ctrl_status = 0; | |
530 | } | |
531 | } else | |
532 | tty->packet = 0; | |
533 | return 0; | |
534 | } | |
535 | case TIOCGSOFTCAR: | |
536 | return put_user(C_CLOCAL(tty) ? 1 : 0, (int __user *)arg); | |
537 | case TIOCSSOFTCAR: | |
538 | if (get_user(arg, (unsigned int __user *) arg)) | |
539 | return -EFAULT; | |
540 | down(&tty->termios_sem); | |
541 | tty->termios->c_cflag = | |
542 | ((tty->termios->c_cflag & ~CLOCAL) | | |
543 | (arg ? CLOCAL : 0)); | |
544 | up(&tty->termios_sem); | |
545 | return 0; | |
546 | default: | |
547 | return -ENOIOCTLCMD; | |
548 | } | |
549 | } | |
550 | ||
551 | EXPORT_SYMBOL(n_tty_ioctl); |