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