FreeBSD/Linux Kernel Cross Reference
sys/kern/tty.c
1 /*-
2 * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Portions of this software were developed under sponsorship from Snow
6 * B.V., the Netherlands.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: releng/8.2/sys/kern/tty.c 212229 2010-09-05 14:27:55Z kib $");
32
33 #include "opt_compat.h"
34
35 #include <sys/param.h>
36 #include <sys/conf.h>
37 #include <sys/cons.h>
38 #include <sys/fcntl.h>
39 #include <sys/file.h>
40 #include <sys/filedesc.h>
41 #include <sys/filio.h>
42 #ifdef COMPAT_43TTY
43 #include <sys/ioctl_compat.h>
44 #endif /* COMPAT_43TTY */
45 #include <sys/kernel.h>
46 #include <sys/limits.h>
47 #include <sys/malloc.h>
48 #include <sys/mount.h>
49 #include <sys/poll.h>
50 #include <sys/priv.h>
51 #include <sys/proc.h>
52 #include <sys/serial.h>
53 #include <sys/signal.h>
54 #include <sys/stat.h>
55 #include <sys/sx.h>
56 #include <sys/sysctl.h>
57 #include <sys/systm.h>
58 #include <sys/tty.h>
59 #include <sys/ttycom.h>
60 #define TTYDEFCHARS
61 #include <sys/ttydefaults.h>
62 #undef TTYDEFCHARS
63 #include <sys/ucred.h>
64 #include <sys/vnode.h>
65
66 #include <machine/stdarg.h>
67
68 static MALLOC_DEFINE(M_TTY, "tty", "tty device");
69
70 static void tty_rel_free(struct tty *tp);
71
72 static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list);
73 static struct sx tty_list_sx;
74 SX_SYSINIT(tty_list, &tty_list_sx, "tty list");
75 static unsigned int tty_list_count = 0;
76
77 /* Character device of /dev/console. */
78 static struct cdev *dev_console;
79 static const char *dev_console_filename;
80
81 /*
82 * Flags that are supported and stored by this implementation.
83 */
84 #define TTYSUP_IFLAG (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|ISTRIP|\
85 INLCR|IGNCR|ICRNL|IXON|IXOFF|IXANY|IMAXBEL)
86 #define TTYSUP_OFLAG (OPOST|ONLCR|TAB3|ONOEOT|OCRNL|ONOCR|ONLRET)
87 #define TTYSUP_LFLAG (ECHOKE|ECHOE|ECHOK|ECHO|ECHONL|ECHOPRT|\
88 ECHOCTL|ISIG|ICANON|ALTWERASE|IEXTEN|TOSTOP|\
89 FLUSHO|NOKERNINFO|NOFLSH)
90 #define TTYSUP_CFLAG (CIGNORE|CSIZE|CSTOPB|CREAD|PARENB|PARODD|\
91 HUPCL|CLOCAL|CCTS_OFLOW|CRTS_IFLOW|CDTR_IFLOW|\
92 CDSR_OFLOW|CCAR_OFLOW)
93
94 #define TTY_CALLOUT(tp,d) ((d) != (tp)->t_dev && (d) != dev_console)
95
96 /*
97 * Set TTY buffer sizes.
98 */
99
100 #define TTYBUF_MAX 65536
101
102 static void
103 tty_watermarks(struct tty *tp)
104 {
105 size_t bs;
106
107 /* Provide an input buffer for 0.2 seconds of data. */
108 bs = MIN(tp->t_termios.c_ispeed / 5, TTYBUF_MAX);
109 ttyinq_setsize(&tp->t_inq, tp, bs);
110
111 /* Set low watermark at 10% (when 90% is available). */
112 tp->t_inlow = (ttyinq_getallocatedsize(&tp->t_inq) * 9) / 10;
113
114 /* Provide an ouput buffer for 0.2 seconds of data. */
115 bs = MIN(tp->t_termios.c_ospeed / 5, TTYBUF_MAX);
116 ttyoutq_setsize(&tp->t_outq, tp, bs);
117
118 /* Set low watermark at 10% (when 90% is available). */
119 tp->t_outlow = (ttyoutq_getallocatedsize(&tp->t_outq) * 9) / 10;
120 }
121
122 static int
123 tty_drain(struct tty *tp)
124 {
125 int error;
126
127 if (ttyhook_hashook(tp, getc_inject))
128 /* buffer is inaccessible */
129 return (0);
130
131 while (ttyoutq_bytesused(&tp->t_outq) > 0) {
132 ttydevsw_outwakeup(tp);
133 /* Could be handled synchronously. */
134 if (ttyoutq_bytesused(&tp->t_outq) == 0)
135 return (0);
136
137 /* Wait for data to be drained. */
138 error = tty_wait(tp, &tp->t_outwait);
139 if (error)
140 return (error);
141 }
142
143 return (0);
144 }
145
146 /*
147 * Though ttydev_enter() and ttydev_leave() seem to be related, they
148 * don't have to be used together. ttydev_enter() is used by the cdev
149 * operations to prevent an actual operation from being processed when
150 * the TTY has been abandoned. ttydev_leave() is used by ttydev_open()
151 * and ttydev_close() to determine whether per-TTY data should be
152 * deallocated.
153 */
154
155 static __inline int
156 ttydev_enter(struct tty *tp)
157 {
158 tty_lock(tp);
159
160 if (tty_gone(tp) || !tty_opened(tp)) {
161 /* Device is already gone. */
162 tty_unlock(tp);
163 return (ENXIO);
164 }
165
166 return (0);
167 }
168
169 static void
170 ttydev_leave(struct tty *tp)
171 {
172 tty_lock_assert(tp, MA_OWNED);
173
174 if (tty_opened(tp) || tp->t_flags & TF_OPENCLOSE) {
175 /* Device is still opened somewhere. */
176 tty_unlock(tp);
177 return;
178 }
179
180 tp->t_flags |= TF_OPENCLOSE;
181
182 /* Stop asynchronous I/O. */
183 funsetown(&tp->t_sigio);
184
185 /* Remove console TTY. */
186 if (constty == tp)
187 constty_clear();
188
189 /* Drain any output. */
190 MPASS((tp->t_flags & TF_STOPPED) == 0);
191 if (!tty_gone(tp))
192 tty_drain(tp);
193
194 ttydisc_close(tp);
195
196 /* Destroy associated buffers already. */
197 ttyinq_free(&tp->t_inq);
198 tp->t_inlow = 0;
199 ttyoutq_free(&tp->t_outq);
200 tp->t_outlow = 0;
201
202 knlist_clear(&tp->t_inpoll.si_note, 1);
203 knlist_clear(&tp->t_outpoll.si_note, 1);
204
205 if (!tty_gone(tp))
206 ttydevsw_close(tp);
207
208 tp->t_flags &= ~TF_OPENCLOSE;
209 cv_broadcast(&tp->t_dcdwait);
210 tty_rel_free(tp);
211 }
212
213 /*
214 * Operations that are exposed through the character device in /dev.
215 */
216 static int
217 ttydev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
218 {
219 struct tty *tp = dev->si_drv1;
220 int error = 0;
221
222 tty_lock(tp);
223 if (tty_gone(tp)) {
224 /* Device is already gone. */
225 tty_unlock(tp);
226 return (ENXIO);
227 }
228
229 /*
230 * Block when other processes are currently opening or closing
231 * the TTY.
232 */
233 while (tp->t_flags & TF_OPENCLOSE) {
234 error = tty_wait(tp, &tp->t_dcdwait);
235 if (error != 0) {
236 tty_unlock(tp);
237 return (error);
238 }
239 }
240 tp->t_flags |= TF_OPENCLOSE;
241
242 /*
243 * Make sure the "tty" and "cua" device cannot be opened at the
244 * same time.
245 */
246 if (TTY_CALLOUT(tp, dev)) {
247 if (tp->t_flags & TF_OPENED_IN) {
248 error = EBUSY;
249 goto done;
250 }
251 } else {
252 if (tp->t_flags & TF_OPENED_OUT) {
253 error = EBUSY;
254 goto done;
255 }
256 }
257
258 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) {
259 error = EBUSY;
260 goto done;
261 }
262
263 if (!tty_opened(tp)) {
264 /* Set proper termios flags. */
265 if (TTY_CALLOUT(tp, dev)) {
266 tp->t_termios = tp->t_termios_init_out;
267 } else {
268 tp->t_termios = tp->t_termios_init_in;
269 }
270 ttydevsw_param(tp, &tp->t_termios);
271
272 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0);
273
274 error = ttydevsw_open(tp);
275 if (error != 0)
276 goto done;
277
278 ttydisc_open(tp);
279 tty_watermarks(tp);
280 }
281
282 /* Wait for Carrier Detect. */
283 if (!TTY_CALLOUT(tp, dev) && (oflags & O_NONBLOCK) == 0 &&
284 (tp->t_termios.c_cflag & CLOCAL) == 0) {
285 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) {
286 error = tty_wait(tp, &tp->t_dcdwait);
287 if (error != 0)
288 goto done;
289 }
290 }
291
292 if (dev == dev_console)
293 tp->t_flags |= TF_OPENED_CONS;
294 else if (TTY_CALLOUT(tp, dev))
295 tp->t_flags |= TF_OPENED_OUT;
296 else
297 tp->t_flags |= TF_OPENED_IN;
298
299 done: tp->t_flags &= ~TF_OPENCLOSE;
300 cv_broadcast(&tp->t_dcdwait);
301 ttydev_leave(tp);
302
303 return (error);
304 }
305
306 static int
307 ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
308 {
309 struct tty *tp = dev->si_drv1;
310
311 tty_lock(tp);
312
313 /*
314 * Don't actually close the device if it is being used as the
315 * console.
316 */
317 MPASS((tp->t_flags & TF_OPENED) != TF_OPENED);
318 if (dev == dev_console)
319 tp->t_flags &= ~TF_OPENED_CONS;
320 else
321 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT);
322
323 if (tp->t_flags & TF_OPENED) {
324 tty_unlock(tp);
325 return (0);
326 }
327
328 /*
329 * This can only be called once. The callin and the callout
330 * devices cannot be opened at the same time.
331 */
332 tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED);
333
334 /* Properly wake up threads that are stuck - revoke(). */
335 tp->t_revokecnt++;
336 tty_wakeup(tp, FREAD|FWRITE);
337 cv_broadcast(&tp->t_bgwait);
338 cv_broadcast(&tp->t_dcdwait);
339
340 ttydev_leave(tp);
341
342 return (0);
343 }
344
345 static __inline int
346 tty_is_ctty(struct tty *tp, struct proc *p)
347 {
348 tty_lock_assert(tp, MA_OWNED);
349
350 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT);
351 }
352
353 static int
354 tty_wait_background(struct tty *tp, struct thread *td, int sig)
355 {
356 struct proc *p = td->td_proc;
357 struct pgrp *pg;
358 ksiginfo_t ksi;
359 int error;
360
361 MPASS(sig == SIGTTIN || sig == SIGTTOU);
362 tty_lock_assert(tp, MA_OWNED);
363
364 for (;;) {
365 PROC_LOCK(p);
366 /*
367 * The process should only sleep, when:
368 * - This terminal is the controling terminal
369 * - Its process group is not the foreground process
370 * group
371 * - The parent process isn't waiting for the child to
372 * exit
373 * - the signal to send to the process isn't masked
374 */
375 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) {
376 /* Allow the action to happen. */
377 PROC_UNLOCK(p);
378 return (0);
379 }
380
381 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) ||
382 SIGISMEMBER(td->td_sigmask, sig)) {
383 /* Only allow them in write()/ioctl(). */
384 PROC_UNLOCK(p);
385 return (sig == SIGTTOU ? 0 : EIO);
386 }
387
388 pg = p->p_pgrp;
389 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) {
390 /* Don't allow the action to happen. */
391 PROC_UNLOCK(p);
392 return (EIO);
393 }
394 PROC_UNLOCK(p);
395
396 /*
397 * Send the signal and sleep until we're the new
398 * foreground process group.
399 */
400 if (sig != 0) {
401 ksiginfo_init(&ksi);
402 ksi.ksi_code = SI_KERNEL;
403 ksi.ksi_signo = sig;
404 sig = 0;
405 }
406 PGRP_LOCK(pg);
407 pgsignal(pg, ksi.ksi_signo, 1, &ksi);
408 PGRP_UNLOCK(pg);
409
410 error = tty_wait(tp, &tp->t_bgwait);
411 if (error)
412 return (error);
413 }
414 }
415
416 static int
417 ttydev_read(struct cdev *dev, struct uio *uio, int ioflag)
418 {
419 struct tty *tp = dev->si_drv1;
420 int error;
421
422 error = ttydev_enter(tp);
423 if (error)
424 goto done;
425
426 error = tty_wait_background(tp, curthread, SIGTTIN);
427 if (error) {
428 tty_unlock(tp);
429 goto done;
430 }
431
432 error = ttydisc_read(tp, uio, ioflag);
433 tty_unlock(tp);
434
435 /*
436 * The read() call should not throw an error when the device is
437 * being destroyed. Silently convert it to an EOF.
438 */
439 done: if (error == ENXIO)
440 error = 0;
441 return (error);
442 }
443
444 static int
445 ttydev_write(struct cdev *dev, struct uio *uio, int ioflag)
446 {
447 struct tty *tp = dev->si_drv1;
448 int error;
449
450 error = ttydev_enter(tp);
451 if (error)
452 return (error);
453
454 if (tp->t_termios.c_lflag & TOSTOP) {
455 error = tty_wait_background(tp, curthread, SIGTTOU);
456 if (error)
457 goto done;
458 }
459
460 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) {
461 /* Allow non-blocking writes to bypass serialization. */
462 error = ttydisc_write(tp, uio, ioflag);
463 } else {
464 /* Serialize write() calls. */
465 while (tp->t_flags & TF_BUSY_OUT) {
466 error = tty_wait(tp, &tp->t_outserwait);
467 if (error)
468 goto done;
469 }
470
471 tp->t_flags |= TF_BUSY_OUT;
472 error = ttydisc_write(tp, uio, ioflag);
473 tp->t_flags &= ~TF_BUSY_OUT;
474 cv_signal(&tp->t_outserwait);
475 }
476
477 done: tty_unlock(tp);
478 return (error);
479 }
480
481 static int
482 ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
483 struct thread *td)
484 {
485 struct tty *tp = dev->si_drv1;
486 int error;
487
488 error = ttydev_enter(tp);
489 if (error)
490 return (error);
491
492 switch (cmd) {
493 case TIOCCBRK:
494 case TIOCCONS:
495 case TIOCDRAIN:
496 case TIOCEXCL:
497 case TIOCFLUSH:
498 case TIOCNXCL:
499 case TIOCSBRK:
500 case TIOCSCTTY:
501 case TIOCSETA:
502 case TIOCSETAF:
503 case TIOCSETAW:
504 case TIOCSPGRP:
505 case TIOCSTART:
506 case TIOCSTAT:
507 case TIOCSTI:
508 case TIOCSTOP:
509 case TIOCSWINSZ:
510 #if 0
511 case TIOCSDRAINWAIT:
512 case TIOCSETD:
513 #endif
514 #ifdef COMPAT_43TTY
515 case TIOCLBIC:
516 case TIOCLBIS:
517 case TIOCLSET:
518 case TIOCSETC:
519 case OTIOCSETD:
520 case TIOCSETN:
521 case TIOCSETP:
522 case TIOCSLTC:
523 #endif /* COMPAT_43TTY */
524 /*
525 * If the ioctl() causes the TTY to be modified, let it
526 * wait in the background.
527 */
528 error = tty_wait_background(tp, curthread, SIGTTOU);
529 if (error)
530 goto done;
531 }
532
533 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) {
534 struct termios *old = &tp->t_termios;
535 struct termios *new = (struct termios *)data;
536 struct termios *lock = TTY_CALLOUT(tp, dev) ?
537 &tp->t_termios_lock_out : &tp->t_termios_lock_in;
538 int cc;
539
540 /*
541 * Lock state devices. Just overwrite the values of the
542 * commands that are currently in use.
543 */
544 new->c_iflag = (old->c_iflag & lock->c_iflag) |
545 (new->c_iflag & ~lock->c_iflag);
546 new->c_oflag = (old->c_oflag & lock->c_oflag) |
547 (new->c_oflag & ~lock->c_oflag);
548 new->c_cflag = (old->c_cflag & lock->c_cflag) |
549 (new->c_cflag & ~lock->c_cflag);
550 new->c_lflag = (old->c_lflag & lock->c_lflag) |
551 (new->c_lflag & ~lock->c_lflag);
552 for (cc = 0; cc < NCCS; ++cc)
553 if (lock->c_cc[cc])
554 new->c_cc[cc] = old->c_cc[cc];
555 if (lock->c_ispeed)
556 new->c_ispeed = old->c_ispeed;
557 if (lock->c_ospeed)
558 new->c_ospeed = old->c_ospeed;
559 }
560
561 error = tty_ioctl(tp, cmd, data, fflag, td);
562 done: tty_unlock(tp);
563
564 return (error);
565 }
566
567 static int
568 ttydev_poll(struct cdev *dev, int events, struct thread *td)
569 {
570 struct tty *tp = dev->si_drv1;
571 int error, revents = 0;
572
573 error = ttydev_enter(tp);
574 if (error)
575 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP);
576
577 if (events & (POLLIN|POLLRDNORM)) {
578 /* See if we can read something. */
579 if (ttydisc_read_poll(tp) > 0)
580 revents |= events & (POLLIN|POLLRDNORM);
581 }
582
583 if (tp->t_flags & TF_ZOMBIE) {
584 /* Hangup flag on zombie state. */
585 revents |= POLLHUP;
586 } else if (events & (POLLOUT|POLLWRNORM)) {
587 /* See if we can write something. */
588 if (ttydisc_write_poll(tp) > 0)
589 revents |= events & (POLLOUT|POLLWRNORM);
590 }
591
592 if (revents == 0) {
593 if (events & (POLLIN|POLLRDNORM))
594 selrecord(td, &tp->t_inpoll);
595 if (events & (POLLOUT|POLLWRNORM))
596 selrecord(td, &tp->t_outpoll);
597 }
598
599 tty_unlock(tp);
600
601 return (revents);
602 }
603
604 static int
605 ttydev_mmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot)
606 {
607 struct tty *tp = dev->si_drv1;
608 int error;
609
610 /* Handle mmap() through the driver. */
611
612 error = ttydev_enter(tp);
613 if (error)
614 return (-1);
615 error = ttydevsw_mmap(tp, offset, paddr, nprot);
616 tty_unlock(tp);
617
618 return (error);
619 }
620
621 /*
622 * kqueue support.
623 */
624
625 static void
626 tty_kqops_read_detach(struct knote *kn)
627 {
628 struct tty *tp = kn->kn_hook;
629
630 knlist_remove(&tp->t_inpoll.si_note, kn, 0);
631 }
632
633 static int
634 tty_kqops_read_event(struct knote *kn, long hint)
635 {
636 struct tty *tp = kn->kn_hook;
637
638 tty_lock_assert(tp, MA_OWNED);
639
640 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) {
641 kn->kn_flags |= EV_EOF;
642 return (1);
643 } else {
644 kn->kn_data = ttydisc_read_poll(tp);
645 return (kn->kn_data > 0);
646 }
647 }
648
649 static void
650 tty_kqops_write_detach(struct knote *kn)
651 {
652 struct tty *tp = kn->kn_hook;
653
654 knlist_remove(&tp->t_outpoll.si_note, kn, 0);
655 }
656
657 static int
658 tty_kqops_write_event(struct knote *kn, long hint)
659 {
660 struct tty *tp = kn->kn_hook;
661
662 tty_lock_assert(tp, MA_OWNED);
663
664 if (tty_gone(tp)) {
665 kn->kn_flags |= EV_EOF;
666 return (1);
667 } else {
668 kn->kn_data = ttydisc_write_poll(tp);
669 return (kn->kn_data > 0);
670 }
671 }
672
673 static struct filterops tty_kqops_read =
674 { 1, NULL, tty_kqops_read_detach, tty_kqops_read_event };
675 static struct filterops tty_kqops_write =
676 { 1, NULL, tty_kqops_write_detach, tty_kqops_write_event };
677
678 static int
679 ttydev_kqfilter(struct cdev *dev, struct knote *kn)
680 {
681 struct tty *tp = dev->si_drv1;
682 int error;
683
684 error = ttydev_enter(tp);
685 if (error)
686 return (error);
687
688 switch (kn->kn_filter) {
689 case EVFILT_READ:
690 kn->kn_hook = tp;
691 kn->kn_fop = &tty_kqops_read;
692 knlist_add(&tp->t_inpoll.si_note, kn, 1);
693 break;
694 case EVFILT_WRITE:
695 kn->kn_hook = tp;
696 kn->kn_fop = &tty_kqops_write;
697 knlist_add(&tp->t_outpoll.si_note, kn, 1);
698 break;
699 default:
700 error = EINVAL;
701 break;
702 }
703
704 tty_unlock(tp);
705 return (error);
706 }
707
708 static struct cdevsw ttydev_cdevsw = {
709 .d_version = D_VERSION,
710 .d_open = ttydev_open,
711 .d_close = ttydev_close,
712 .d_read = ttydev_read,
713 .d_write = ttydev_write,
714 .d_ioctl = ttydev_ioctl,
715 .d_kqfilter = ttydev_kqfilter,
716 .d_poll = ttydev_poll,
717 .d_mmap = ttydev_mmap,
718 .d_name = "ttydev",
719 .d_flags = D_TTY,
720 };
721
722 /*
723 * Init/lock-state devices
724 */
725
726 static int
727 ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
728 {
729 struct tty *tp = dev->si_drv1;
730 int error = 0;
731
732 tty_lock(tp);
733 if (tty_gone(tp))
734 error = ENODEV;
735 tty_unlock(tp);
736
737 return (error);
738 }
739
740 static int
741 ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td)
742 {
743 return (0);
744 }
745
746 static int
747 ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag)
748 {
749 return (ENODEV);
750 }
751
752 static int
753 ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
754 struct thread *td)
755 {
756 struct tty *tp = dev->si_drv1;
757 int error = 0;
758
759 tty_lock(tp);
760 if (tty_gone(tp)) {
761 error = ENODEV;
762 goto done;
763 }
764
765 switch (cmd) {
766 case TIOCGETA:
767 /* Obtain terminal flags through tcgetattr(). */
768 *(struct termios*)data = *(struct termios*)dev->si_drv2;
769 break;
770 case TIOCSETA:
771 /* Set terminal flags through tcsetattr(). */
772 error = priv_check(td, PRIV_TTY_SETA);
773 if (error)
774 break;
775 *(struct termios*)dev->si_drv2 = *(struct termios*)data;
776 break;
777 case TIOCGETD:
778 *(int *)data = TTYDISC;
779 break;
780 case TIOCGWINSZ:
781 bzero(data, sizeof(struct winsize));
782 break;
783 default:
784 error = ENOTTY;
785 }
786
787 done: tty_unlock(tp);
788 return (error);
789 }
790
791 static struct cdevsw ttyil_cdevsw = {
792 .d_version = D_VERSION,
793 .d_open = ttyil_open,
794 .d_close = ttyil_close,
795 .d_read = ttyil_rdwr,
796 .d_write = ttyil_rdwr,
797 .d_ioctl = ttyil_ioctl,
798 .d_name = "ttyil",
799 .d_flags = D_TTY,
800 };
801
802 static void
803 tty_init_termios(struct tty *tp)
804 {
805 struct termios *t = &tp->t_termios_init_in;
806
807 t->c_cflag = TTYDEF_CFLAG;
808 t->c_iflag = TTYDEF_IFLAG;
809 t->c_lflag = TTYDEF_LFLAG;
810 t->c_oflag = TTYDEF_OFLAG;
811 t->c_ispeed = TTYDEF_SPEED;
812 t->c_ospeed = TTYDEF_SPEED;
813 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars);
814
815 tp->t_termios_init_out = *t;
816 }
817
818 void
819 tty_init_console(struct tty *tp, speed_t s)
820 {
821 struct termios *ti = &tp->t_termios_init_in;
822 struct termios *to = &tp->t_termios_init_out;
823
824 if (s != 0) {
825 ti->c_ispeed = ti->c_ospeed = s;
826 to->c_ispeed = to->c_ospeed = s;
827 }
828
829 ti->c_cflag |= CLOCAL;
830 to->c_cflag |= CLOCAL;
831 }
832
833 /*
834 * Standard device routine implementations, mostly meant for
835 * pseudo-terminal device drivers. When a driver creates a new terminal
836 * device class, missing routines are patched.
837 */
838
839 static int
840 ttydevsw_defopen(struct tty *tp)
841 {
842
843 return (0);
844 }
845
846 static void
847 ttydevsw_defclose(struct tty *tp)
848 {
849 }
850
851 static void
852 ttydevsw_defoutwakeup(struct tty *tp)
853 {
854
855 panic("Terminal device has output, while not implemented");
856 }
857
858 static void
859 ttydevsw_definwakeup(struct tty *tp)
860 {
861 }
862
863 static int
864 ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
865 {
866
867 return (ENOIOCTL);
868 }
869
870 static int
871 ttydevsw_defparam(struct tty *tp, struct termios *t)
872 {
873
874 /* Use a fake baud rate, we're not a real device. */
875 t->c_ispeed = t->c_ospeed = TTYDEF_SPEED;
876
877 return (0);
878 }
879
880 static int
881 ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff)
882 {
883
884 /* Simulate a carrier to make the TTY layer happy. */
885 return (SER_DCD);
886 }
887
888 static int
889 ttydevsw_defmmap(struct tty *tp, vm_offset_t offset, vm_paddr_t *paddr,
890 int nprot)
891 {
892
893 return (-1);
894 }
895
896 static void
897 ttydevsw_defpktnotify(struct tty *tp, char event)
898 {
899 }
900
901 static void
902 ttydevsw_deffree(void *softc)
903 {
904
905 panic("Terminal device freed without a free-handler");
906 }
907
908 /*
909 * TTY allocation and deallocation. TTY devices can be deallocated when
910 * the driver doesn't use it anymore, when the TTY isn't a session's
911 * controlling TTY and when the device node isn't opened through devfs.
912 */
913
914 struct tty *
915 tty_alloc(struct ttydevsw *tsw, void *sc)
916 {
917
918 return (tty_alloc_mutex(tsw, sc, NULL));
919 }
920
921 struct tty *
922 tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex)
923 {
924 struct tty *tp;
925
926 /* Make sure the driver defines all routines. */
927 #define PATCH_FUNC(x) do { \
928 if (tsw->tsw_ ## x == NULL) \
929 tsw->tsw_ ## x = ttydevsw_def ## x; \
930 } while (0)
931 PATCH_FUNC(open);
932 PATCH_FUNC(close);
933 PATCH_FUNC(outwakeup);
934 PATCH_FUNC(inwakeup);
935 PATCH_FUNC(ioctl);
936 PATCH_FUNC(param);
937 PATCH_FUNC(modem);
938 PATCH_FUNC(mmap);
939 PATCH_FUNC(pktnotify);
940 PATCH_FUNC(free);
941 #undef PATCH_FUNC
942
943 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO);
944 tp->t_devsw = tsw;
945 tp->t_devswsoftc = sc;
946 tp->t_flags = tsw->tsw_flags;
947
948 tty_init_termios(tp);
949
950 cv_init(&tp->t_inwait, "ttyin");
951 cv_init(&tp->t_outwait, "ttyout");
952 cv_init(&tp->t_outserwait, "ttyosr");
953 cv_init(&tp->t_bgwait, "ttybg");
954 cv_init(&tp->t_dcdwait, "ttydcd");
955
956 /* Allow drivers to use a custom mutex to lock the TTY. */
957 if (mutex != NULL) {
958 tp->t_mtx = mutex;
959 } else {
960 tp->t_mtx = &tp->t_mtxobj;
961 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF);
962 }
963
964 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx);
965 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx);
966
967 sx_xlock(&tty_list_sx);
968 TAILQ_INSERT_TAIL(&tty_list, tp, t_list);
969 tty_list_count++;
970 sx_xunlock(&tty_list_sx);
971
972 return (tp);
973 }
974
975 static void
976 tty_dealloc(void *arg)
977 {
978 struct tty *tp = arg;
979
980 sx_xlock(&tty_list_sx);
981 TAILQ_REMOVE(&tty_list, tp, t_list);
982 tty_list_count--;
983 sx_xunlock(&tty_list_sx);
984
985 /* Make sure we haven't leaked buffers. */
986 MPASS(ttyinq_getsize(&tp->t_inq) == 0);
987 MPASS(ttyoutq_getsize(&tp->t_outq) == 0);
988
989 knlist_destroy(&tp->t_inpoll.si_note);
990 knlist_destroy(&tp->t_outpoll.si_note);
991
992 cv_destroy(&tp->t_inwait);
993 cv_destroy(&tp->t_outwait);
994 cv_destroy(&tp->t_bgwait);
995 cv_destroy(&tp->t_dcdwait);
996 cv_destroy(&tp->t_outserwait);
997
998 if (tp->t_mtx == &tp->t_mtxobj)
999 mtx_destroy(&tp->t_mtxobj);
1000 ttydevsw_free(tp);
1001 free(tp, M_TTY);
1002 }
1003
1004 static void
1005 tty_rel_free(struct tty *tp)
1006 {
1007 struct cdev *dev;
1008
1009 tty_lock_assert(tp, MA_OWNED);
1010
1011 #define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE)
1012 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) {
1013 /* TTY is still in use. */
1014 tty_unlock(tp);
1015 return;
1016 }
1017
1018 /* TTY can be deallocated. */
1019 dev = tp->t_dev;
1020 tp->t_dev = NULL;
1021 tty_unlock(tp);
1022
1023 if (dev != NULL)
1024 destroy_dev_sched_cb(dev, tty_dealloc, tp);
1025 }
1026
1027 void
1028 tty_rel_pgrp(struct tty *tp, struct pgrp *pg)
1029 {
1030 MPASS(tp->t_sessioncnt > 0);
1031 tty_lock_assert(tp, MA_OWNED);
1032
1033 if (tp->t_pgrp == pg)
1034 tp->t_pgrp = NULL;
1035
1036 tty_unlock(tp);
1037 }
1038
1039 void
1040 tty_rel_sess(struct tty *tp, struct session *sess)
1041 {
1042 MPASS(tp->t_sessioncnt > 0);
1043
1044 /* Current session has left. */
1045 if (tp->t_session == sess) {
1046 tp->t_session = NULL;
1047 MPASS(tp->t_pgrp == NULL);
1048 }
1049 tp->t_sessioncnt--;
1050 tty_rel_free(tp);
1051 }
1052
1053 void
1054 tty_rel_gone(struct tty *tp)
1055 {
1056 MPASS(!tty_gone(tp));
1057
1058 /* Simulate carrier removal. */
1059 ttydisc_modem(tp, 0);
1060
1061 /* Wake up all blocked threads. */
1062 tty_wakeup(tp, FREAD|FWRITE);
1063 cv_broadcast(&tp->t_bgwait);
1064 cv_broadcast(&tp->t_dcdwait);
1065
1066 tp->t_flags |= TF_GONE;
1067 tty_rel_free(tp);
1068 }
1069
1070 /*
1071 * Exposing information about current TTY's through sysctl
1072 */
1073
1074 static void
1075 tty_to_xtty(struct tty *tp, struct xtty *xt)
1076 {
1077 tty_lock_assert(tp, MA_OWNED);
1078
1079 xt->xt_size = sizeof(struct xtty);
1080 xt->xt_insize = ttyinq_getsize(&tp->t_inq);
1081 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq);
1082 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq);
1083 xt->xt_inlow = tp->t_inlow;
1084 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq);
1085 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq);
1086 xt->xt_outlow = tp->t_outlow;
1087 xt->xt_column = tp->t_column;
1088 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
1089 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0;
1090 xt->xt_flags = tp->t_flags;
1091 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV;
1092 }
1093
1094 static int
1095 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
1096 {
1097 unsigned long lsize;
1098 struct xtty *xtlist, *xt;
1099 struct tty *tp;
1100 int error;
1101
1102 sx_slock(&tty_list_sx);
1103 lsize = tty_list_count * sizeof(struct xtty);
1104 if (lsize == 0) {
1105 sx_sunlock(&tty_list_sx);
1106 return (0);
1107 }
1108
1109 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK);
1110
1111 TAILQ_FOREACH(tp, &tty_list, t_list) {
1112 tty_lock(tp);
1113 tty_to_xtty(tp, xt);
1114 tty_unlock(tp);
1115 xt++;
1116 }
1117 sx_sunlock(&tty_list_sx);
1118
1119 error = SYSCTL_OUT(req, xtlist, lsize);
1120 free(xtlist, M_TTY);
1121 return (error);
1122 }
1123
1124 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
1125 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs");
1126
1127 /*
1128 * Device node creation. Device has been set up, now we can expose it to
1129 * the user.
1130 */
1131
1132 void
1133 tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...)
1134 {
1135 va_list ap;
1136 struct cdev *dev;
1137 const char *prefix = "tty";
1138 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */
1139 uid_t uid;
1140 gid_t gid;
1141 mode_t mode;
1142
1143 /* Remove "tty" prefix from devices like PTY's. */
1144 if (tp->t_flags & TF_NOPREFIX)
1145 prefix = "";
1146
1147 va_start(ap, fmt);
1148 vsnrprintf(name, sizeof name, 32, fmt, ap);
1149 va_end(ap);
1150
1151 if (cred == NULL) {
1152 /* System device. */
1153 uid = UID_ROOT;
1154 gid = GID_WHEEL;
1155 mode = S_IRUSR|S_IWUSR;
1156 } else {
1157 /* User device. */
1158 uid = cred->cr_ruid;
1159 gid = GID_TTY;
1160 mode = S_IRUSR|S_IWUSR|S_IWGRP;
1161 }
1162
1163 /* Master call-in device. */
1164 dev = make_dev_cred(&ttydev_cdevsw, 0, cred,
1165 uid, gid, mode, "%s%s", prefix, name);
1166 dev->si_drv1 = tp;
1167 tp->t_dev = dev;
1168
1169 /* Slave call-in devices. */
1170 if (tp->t_flags & TF_INITLOCK) {
1171 dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1172 uid, gid, mode, "%s%s.init", prefix, name);
1173 dev_depends(tp->t_dev, dev);
1174 dev->si_drv1 = tp;
1175 dev->si_drv2 = &tp->t_termios_init_in;
1176
1177 dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1178 uid, gid, mode, "%s%s.lock", prefix, name);
1179 dev_depends(tp->t_dev, dev);
1180 dev->si_drv1 = tp;
1181 dev->si_drv2 = &tp->t_termios_lock_in;
1182 }
1183
1184 /* Call-out devices. */
1185 if (tp->t_flags & TF_CALLOUT) {
1186 dev = make_dev_cred(&ttydev_cdevsw, 0, cred,
1187 UID_UUCP, GID_DIALER, 0660, "cua%s", name);
1188 dev_depends(tp->t_dev, dev);
1189 dev->si_drv1 = tp;
1190
1191 /* Slave call-out devices. */
1192 if (tp->t_flags & TF_INITLOCK) {
1193 dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1194 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name);
1195 dev_depends(tp->t_dev, dev);
1196 dev->si_drv1 = tp;
1197 dev->si_drv2 = &tp->t_termios_init_out;
1198
1199 dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1200 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name);
1201 dev_depends(tp->t_dev, dev);
1202 dev->si_drv1 = tp;
1203 dev->si_drv2 = &tp->t_termios_lock_out;
1204 }
1205 }
1206 }
1207
1208 /*
1209 * Signalling processes.
1210 */
1211
1212 void
1213 tty_signal_sessleader(struct tty *tp, int sig)
1214 {
1215 struct proc *p;
1216
1217 tty_lock_assert(tp, MA_OWNED);
1218 MPASS(sig >= 1 && sig < NSIG);
1219
1220 /* Make signals start output again. */
1221 tp->t_flags &= ~TF_STOPPED;
1222
1223 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) {
1224 p = tp->t_session->s_leader;
1225 PROC_LOCK(p);
1226 psignal(p, sig);
1227 PROC_UNLOCK(p);
1228 }
1229 }
1230
1231 void
1232 tty_signal_pgrp(struct tty *tp, int sig)
1233 {
1234 ksiginfo_t ksi;
1235
1236 tty_lock_assert(tp, MA_OWNED);
1237 MPASS(sig >= 1 && sig < NSIG);
1238
1239 /* Make signals start output again. */
1240 tp->t_flags &= ~TF_STOPPED;
1241
1242 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO))
1243 tty_info(tp);
1244 if (tp->t_pgrp != NULL) {
1245 ksiginfo_init(&ksi);
1246 ksi.ksi_signo = sig;
1247 ksi.ksi_code = SI_KERNEL;
1248 PGRP_LOCK(tp->t_pgrp);
1249 pgsignal(tp->t_pgrp, sig, 1, &ksi);
1250 PGRP_UNLOCK(tp->t_pgrp);
1251 }
1252 }
1253
1254 void
1255 tty_wakeup(struct tty *tp, int flags)
1256 {
1257 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL)
1258 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL));
1259
1260 if (flags & FWRITE) {
1261 cv_broadcast(&tp->t_outwait);
1262 selwakeup(&tp->t_outpoll);
1263 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0);
1264 }
1265 if (flags & FREAD) {
1266 cv_broadcast(&tp->t_inwait);
1267 selwakeup(&tp->t_inpoll);
1268 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0);
1269 }
1270 }
1271
1272 int
1273 tty_wait(struct tty *tp, struct cv *cv)
1274 {
1275 int error;
1276 int revokecnt = tp->t_revokecnt;
1277
1278 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED);
1279 MPASS(!tty_gone(tp));
1280
1281 error = cv_wait_sig(cv, tp->t_mtx);
1282
1283 /* Restart the system call when we may have been revoked. */
1284 if (tp->t_revokecnt != revokecnt)
1285 return (ERESTART);
1286
1287 /* Bail out when the device slipped away. */
1288 if (tty_gone(tp))
1289 return (ENXIO);
1290
1291 return (error);
1292 }
1293
1294 int
1295 tty_timedwait(struct tty *tp, struct cv *cv, int hz)
1296 {
1297 int error;
1298 int revokecnt = tp->t_revokecnt;
1299
1300 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED);
1301 MPASS(!tty_gone(tp));
1302
1303 error = cv_timedwait_sig(cv, tp->t_mtx, hz);
1304
1305 /* Restart the system call when we may have been revoked. */
1306 if (tp->t_revokecnt != revokecnt)
1307 return (ERESTART);
1308
1309 /* Bail out when the device slipped away. */
1310 if (tty_gone(tp))
1311 return (ENXIO);
1312
1313 return (error);
1314 }
1315
1316 void
1317 tty_flush(struct tty *tp, int flags)
1318 {
1319 if (flags & FWRITE) {
1320 tp->t_flags &= ~TF_HIWAT_OUT;
1321 ttyoutq_flush(&tp->t_outq);
1322 tty_wakeup(tp, FWRITE);
1323 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE);
1324 }
1325 if (flags & FREAD) {
1326 tty_hiwat_in_unblock(tp);
1327 ttyinq_flush(&tp->t_inq);
1328 ttydevsw_inwakeup(tp);
1329 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD);
1330 }
1331 }
1332
1333 static int
1334 tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag,
1335 struct thread *td)
1336 {
1337 int error;
1338
1339 switch (cmd) {
1340 /*
1341 * Modem commands.
1342 * The SER_* and TIOCM_* flags are the same, but one bit
1343 * shifted. I don't know why.
1344 */
1345 case TIOCSDTR:
1346 ttydevsw_modem(tp, SER_DTR, 0);
1347 return (0);
1348 case TIOCCDTR:
1349 ttydevsw_modem(tp, 0, SER_DTR);
1350 return (0);
1351 case TIOCMSET: {
1352 int bits = *(int *)data;
1353 ttydevsw_modem(tp,
1354 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1,
1355 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1);
1356 return (0);
1357 }
1358 case TIOCMBIS: {
1359 int bits = *(int *)data;
1360 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0);
1361 return (0);
1362 }
1363 case TIOCMBIC: {
1364 int bits = *(int *)data;
1365 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1);
1366 return (0);
1367 }
1368 case TIOCMGET:
1369 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1);
1370 return (0);
1371
1372 case FIOASYNC:
1373 if (*(int *)data)
1374 tp->t_flags |= TF_ASYNC;
1375 else
1376 tp->t_flags &= ~TF_ASYNC;
1377 return (0);
1378 case FIONBIO:
1379 /* This device supports non-blocking operation. */
1380 return (0);
1381 case FIONREAD:
1382 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq);
1383 return (0);
1384 case FIONWRITE:
1385 case TIOCOUTQ:
1386 *(int *)data = ttyoutq_bytesused(&tp->t_outq);
1387 return (0);
1388 case FIOSETOWN:
1389 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc))
1390 /* Not allowed to set ownership. */
1391 return (ENOTTY);
1392
1393 /* Temporarily unlock the TTY to set ownership. */
1394 tty_unlock(tp);
1395 error = fsetown(*(int *)data, &tp->t_sigio);
1396 tty_lock(tp);
1397 return (error);
1398 case FIOGETOWN:
1399 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc))
1400 /* Not allowed to set ownership. */
1401 return (ENOTTY);
1402
1403 /* Get ownership. */
1404 *(int *)data = fgetown(&tp->t_sigio);
1405 return (0);
1406 case TIOCGETA:
1407 /* Obtain terminal flags through tcgetattr(). */
1408 *(struct termios*)data = tp->t_termios;
1409 return (0);
1410 case TIOCSETA:
1411 case TIOCSETAW:
1412 case TIOCSETAF: {
1413 struct termios *t = data;
1414
1415 /*
1416 * Who makes up these funny rules? According to POSIX,
1417 * input baud rate is set equal to the output baud rate
1418 * when zero.
1419 */
1420 if (t->c_ispeed == 0)
1421 t->c_ispeed = t->c_ospeed;
1422
1423 /* Discard any unsupported bits. */
1424 t->c_iflag &= TTYSUP_IFLAG;
1425 t->c_oflag &= TTYSUP_OFLAG;
1426 t->c_lflag &= TTYSUP_LFLAG;
1427 t->c_cflag &= TTYSUP_CFLAG;
1428
1429 /* Set terminal flags through tcsetattr(). */
1430 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
1431 error = tty_drain(tp);
1432 if (error)
1433 return (error);
1434 if (cmd == TIOCSETAF)
1435 tty_flush(tp, FREAD);
1436 }
1437
1438 /*
1439 * Only call param() when the flags really change.
1440 */
1441 if ((t->c_cflag & CIGNORE) == 0 &&
1442 (tp->t_termios.c_cflag != t->c_cflag ||
1443 tp->t_termios.c_ispeed != t->c_ispeed ||
1444 tp->t_termios.c_ospeed != t->c_ospeed)) {
1445 error = ttydevsw_param(tp, t);
1446 if (error)
1447 return (error);
1448
1449 /* XXX: CLOCAL? */
1450
1451 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE;
1452 tp->t_termios.c_ispeed = t->c_ispeed;
1453 tp->t_termios.c_ospeed = t->c_ospeed;
1454
1455 /* Baud rate has changed - update watermarks. */
1456 tty_watermarks(tp);
1457 }
1458
1459 /* Copy new non-device driver parameters. */
1460 tp->t_termios.c_iflag = t->c_iflag;
1461 tp->t_termios.c_oflag = t->c_oflag;
1462 tp->t_termios.c_lflag = t->c_lflag;
1463 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc);
1464
1465 ttydisc_optimize(tp);
1466
1467 if ((t->c_lflag & ICANON) == 0) {
1468 /*
1469 * When in non-canonical mode, wake up all
1470 * readers. Canonicalize any partial input. VMIN
1471 * and VTIME could also be adjusted.
1472 */
1473 ttyinq_canonicalize(&tp->t_inq);
1474 tty_wakeup(tp, FREAD);
1475 }
1476
1477 /*
1478 * For packet mode: notify the PTY consumer that VSTOP
1479 * and VSTART may have been changed.
1480 */
1481 if (tp->t_termios.c_iflag & IXON &&
1482 tp->t_termios.c_cc[VSTOP] == CTRL('S') &&
1483 tp->t_termios.c_cc[VSTART] == CTRL('Q'))
1484 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP);
1485 else
1486 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP);
1487 return (0);
1488 }
1489 case TIOCGETD:
1490 /* For compatibility - we only support TTYDISC. */
1491 *(int *)data = TTYDISC;
1492 return (0);
1493 case TIOCGPGRP:
1494 if (!tty_is_ctty(tp, td->td_proc))
1495 return (ENOTTY);
1496
1497 if (tp->t_pgrp != NULL)
1498 *(int *)data = tp->t_pgrp->pg_id;
1499 else
1500 *(int *)data = NO_PID;
1501 return (0);
1502 case TIOCGSID:
1503 if (!tty_is_ctty(tp, td->td_proc))
1504 return (ENOTTY);
1505
1506 MPASS(tp->t_session);
1507 *(int *)data = tp->t_session->s_sid;
1508 return (0);
1509 case TIOCSCTTY: {
1510 struct proc *p = td->td_proc;
1511
1512 /* XXX: This looks awful. */
1513 tty_unlock(tp);
1514 sx_xlock(&proctree_lock);
1515 tty_lock(tp);
1516
1517 if (!SESS_LEADER(p)) {
1518 /* Only the session leader may do this. */
1519 sx_xunlock(&proctree_lock);
1520 return (EPERM);
1521 }
1522
1523 if (tp->t_session != NULL && tp->t_session == p->p_session) {
1524 /* This is already our controlling TTY. */
1525 sx_xunlock(&proctree_lock);
1526 return (0);
1527 }
1528
1529 if (p->p_session->s_ttyp != NULL ||
1530 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL &&
1531 tp->t_session->s_ttyvp->v_type != VBAD)) {
1532 /*
1533 * There is already a relation between a TTY and
1534 * a session, or the caller is not the session
1535 * leader.
1536 *
1537 * Allow the TTY to be stolen when the vnode is
1538 * invalid, but the reference to the TTY is
1539 * still active. This allows immediate reuse of
1540 * TTYs of which the session leader has been
1541 * killed or the TTY revoked.
1542 */
1543 sx_xunlock(&proctree_lock);
1544 return (EPERM);
1545 }
1546
1547 /* Connect the session to the TTY. */
1548 tp->t_session = p->p_session;
1549 tp->t_session->s_ttyp = tp;
1550 tp->t_sessioncnt++;
1551 sx_xunlock(&proctree_lock);
1552
1553 /* Assign foreground process group. */
1554 tp->t_pgrp = p->p_pgrp;
1555 PROC_LOCK(p);
1556 p->p_flag |= P_CONTROLT;
1557 PROC_UNLOCK(p);
1558
1559 return (0);
1560 }
1561 case TIOCSPGRP: {
1562 struct pgrp *pg;
1563
1564 /*
1565 * XXX: Temporarily unlock the TTY to locate the process
1566 * group. This code would be lot nicer if we would ever
1567 * decompose proctree_lock.
1568 */
1569 tty_unlock(tp);
1570 sx_slock(&proctree_lock);
1571 pg = pgfind(*(int *)data);
1572 if (pg != NULL)
1573 PGRP_UNLOCK(pg);
1574 if (pg == NULL || pg->pg_session != td->td_proc->p_session) {
1575 sx_sunlock(&proctree_lock);
1576 tty_lock(tp);
1577 return (EPERM);
1578 }
1579 tty_lock(tp);
1580
1581 /*
1582 * Determine if this TTY is the controlling TTY after
1583 * relocking the TTY.
1584 */
1585 if (!tty_is_ctty(tp, td->td_proc)) {
1586 sx_sunlock(&proctree_lock);
1587 return (ENOTTY);
1588 }
1589 tp->t_pgrp = pg;
1590 sx_sunlock(&proctree_lock);
1591
1592 /* Wake up the background process groups. */
1593 cv_broadcast(&tp->t_bgwait);
1594 return (0);
1595 }
1596 case TIOCFLUSH: {
1597 int flags = *(int *)data;
1598
1599 if (flags == 0)
1600 flags = (FREAD|FWRITE);
1601 else
1602 flags &= (FREAD|FWRITE);
1603 tty_flush(tp, flags);
1604 return (0);
1605 }
1606 case TIOCDRAIN:
1607 /* Drain TTY output. */
1608 return tty_drain(tp);
1609 case TIOCCONS:
1610 /* Set terminal as console TTY. */
1611 if (*(int *)data) {
1612 error = priv_check(td, PRIV_TTY_CONSOLE);
1613 if (error)
1614 return (error);
1615
1616 /*
1617 * XXX: constty should really need to be locked!
1618 * XXX: allow disconnected constty's to be stolen!
1619 */
1620
1621 if (constty == tp)
1622 return (0);
1623 if (constty != NULL)
1624 return (EBUSY);
1625
1626 tty_unlock(tp);
1627 constty_set(tp);
1628 tty_lock(tp);
1629 } else if (constty == tp) {
1630 constty_clear();
1631 }
1632 return (0);
1633 case TIOCGWINSZ:
1634 /* Obtain window size. */
1635 *(struct winsize*)data = tp->t_winsize;
1636 return (0);
1637 case TIOCSWINSZ:
1638 /* Set window size. */
1639 if (bcmp(&tp->t_winsize, data, sizeof(struct winsize)) == 0)
1640 return (0);
1641 tp->t_winsize = *(struct winsize*)data;
1642 tty_signal_pgrp(tp, SIGWINCH);
1643 return (0);
1644 case TIOCEXCL:
1645 tp->t_flags |= TF_EXCLUDE;
1646 return (0);
1647 case TIOCNXCL:
1648 tp->t_flags &= ~TF_EXCLUDE;
1649 return (0);
1650 case TIOCSTOP:
1651 tp->t_flags |= TF_STOPPED;
1652 ttydevsw_pktnotify(tp, TIOCPKT_STOP);
1653 return (0);
1654 case TIOCSTART:
1655 tp->t_flags &= ~TF_STOPPED;
1656 ttydevsw_outwakeup(tp);
1657 ttydevsw_pktnotify(tp, TIOCPKT_START);
1658 return (0);
1659 case TIOCSTAT:
1660 tty_info(tp);
1661 return (0);
1662 case TIOCSTI:
1663 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI))
1664 return (EPERM);
1665 if (!tty_is_ctty(tp, td->td_proc) &&
1666 priv_check(td, PRIV_TTY_STI))
1667 return (EACCES);
1668 ttydisc_rint(tp, *(char *)data, 0);
1669 ttydisc_rint_done(tp);
1670 return (0);
1671 }
1672
1673 #ifdef COMPAT_43TTY
1674 return tty_ioctl_compat(tp, cmd, data, fflag, td);
1675 #else /* !COMPAT_43TTY */
1676 return (ENOIOCTL);
1677 #endif /* COMPAT_43TTY */
1678 }
1679
1680 int
1681 tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td)
1682 {
1683 int error;
1684
1685 tty_lock_assert(tp, MA_OWNED);
1686
1687 if (tty_gone(tp))
1688 return (ENXIO);
1689
1690 error = ttydevsw_ioctl(tp, cmd, data, td);
1691 if (error == ENOIOCTL)
1692 error = tty_generic_ioctl(tp, cmd, data, fflag, td);
1693
1694 return (error);
1695 }
1696
1697 dev_t
1698 tty_udev(struct tty *tp)
1699 {
1700 if (tp->t_dev)
1701 return dev2udev(tp->t_dev);
1702 else
1703 return NODEV;
1704 }
1705
1706 int
1707 tty_checkoutq(struct tty *tp)
1708 {
1709
1710 /* 256 bytes should be enough to print a log message. */
1711 return (ttyoutq_bytesleft(&tp->t_outq) >= 256);
1712 }
1713
1714 void
1715 tty_hiwat_in_block(struct tty *tp)
1716 {
1717
1718 if ((tp->t_flags & TF_HIWAT_IN) == 0 &&
1719 tp->t_termios.c_iflag & IXOFF &&
1720 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) {
1721 /*
1722 * Input flow control. Only enter the high watermark when we
1723 * can successfully store the VSTOP character.
1724 */
1725 if (ttyoutq_write_nofrag(&tp->t_outq,
1726 &tp->t_termios.c_cc[VSTOP], 1) == 0)
1727 tp->t_flags |= TF_HIWAT_IN;
1728 } else {
1729 /* No input flow control. */
1730 tp->t_flags |= TF_HIWAT_IN;
1731 }
1732 }
1733
1734 void
1735 tty_hiwat_in_unblock(struct tty *tp)
1736 {
1737
1738 if (tp->t_flags & TF_HIWAT_IN &&
1739 tp->t_termios.c_iflag & IXOFF &&
1740 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) {
1741 /*
1742 * Input flow control. Only leave the high watermark when we
1743 * can successfully store the VSTART character.
1744 */
1745 if (ttyoutq_write_nofrag(&tp->t_outq,
1746 &tp->t_termios.c_cc[VSTART], 1) == 0)
1747 tp->t_flags &= ~TF_HIWAT_IN;
1748 } else {
1749 /* No input flow control. */
1750 tp->t_flags &= ~TF_HIWAT_IN;
1751 }
1752
1753 if (!tty_gone(tp))
1754 ttydevsw_inwakeup(tp);
1755 }
1756
1757 /*
1758 * TTY hooks interface.
1759 */
1760
1761 static int
1762 ttyhook_defrint(struct tty *tp, char c, int flags)
1763 {
1764
1765 if (ttyhook_rint_bypass(tp, &c, 1) != 1)
1766 return (-1);
1767
1768 return (0);
1769 }
1770
1771 int
1772 ttyhook_register(struct tty **rtp, struct proc *p, int fd,
1773 struct ttyhook *th, void *softc)
1774 {
1775 struct tty *tp;
1776 struct file *fp;
1777 struct cdev *dev;
1778 struct cdevsw *cdp;
1779 struct filedesc *fdp;
1780 int error, ref;
1781
1782 /* Validate the file descriptor. */
1783 if ((fdp = p->p_fd) == NULL)
1784 return (EBADF);
1785
1786 fp = fget_unlocked(fdp, fd);
1787 if (fp == NULL)
1788 return (EBADF);
1789 if (fp->f_ops == &badfileops) {
1790 error = EBADF;
1791 goto done1;
1792 }
1793
1794 /*
1795 * Make sure the vnode is bound to a character device.
1796 * Unlocked check for the vnode type is ok there, because we
1797 * only shall prevent calling devvn_refthread on the file that
1798 * never has been opened over a character device.
1799 */
1800 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) {
1801 error = EINVAL;
1802 goto done1;
1803 }
1804
1805 /* Make sure it is a TTY. */
1806 cdp = devvn_refthread(fp->f_vnode, &dev, &ref);
1807 if (cdp == NULL) {
1808 error = ENXIO;
1809 goto done1;
1810 }
1811 if (dev != fp->f_data) {
1812 error = ENXIO;
1813 goto done2;
1814 }
1815 if (cdp != &ttydev_cdevsw) {
1816 error = ENOTTY;
1817 goto done2;
1818 }
1819 tp = dev->si_drv1;
1820
1821 /* Try to attach the hook to the TTY. */
1822 error = EBUSY;
1823 tty_lock(tp);
1824 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0));
1825 if (tp->t_flags & TF_HOOK)
1826 goto done3;
1827
1828 tp->t_flags |= TF_HOOK;
1829 tp->t_hook = th;
1830 tp->t_hooksoftc = softc;
1831 *rtp = tp;
1832 error = 0;
1833
1834 /* Maybe we can switch into bypass mode now. */
1835 ttydisc_optimize(tp);
1836
1837 /* Silently convert rint() calls to rint_bypass() when possible. */
1838 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass))
1839 th->th_rint = ttyhook_defrint;
1840
1841 done3: tty_unlock(tp);
1842 done2: dev_relthread(dev, ref);
1843 done1: fdrop(fp, curthread);
1844 return (error);
1845 }
1846
1847 void
1848 ttyhook_unregister(struct tty *tp)
1849 {
1850
1851 tty_lock_assert(tp, MA_OWNED);
1852 MPASS(tp->t_flags & TF_HOOK);
1853
1854 /* Disconnect the hook. */
1855 tp->t_flags &= ~TF_HOOK;
1856 tp->t_hook = NULL;
1857
1858 /* Maybe we need to leave bypass mode. */
1859 ttydisc_optimize(tp);
1860
1861 /* Maybe deallocate the TTY as well. */
1862 tty_rel_free(tp);
1863 }
1864
1865 /*
1866 * /dev/console handling.
1867 */
1868
1869 static int
1870 ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
1871 {
1872 struct tty *tp;
1873
1874 /* System has no console device. */
1875 if (dev_console_filename == NULL)
1876 return (ENXIO);
1877
1878 /* Look up corresponding TTY by device name. */
1879 sx_slock(&tty_list_sx);
1880 TAILQ_FOREACH(tp, &tty_list, t_list) {
1881 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) {
1882 dev_console->si_drv1 = tp;
1883 break;
1884 }
1885 }
1886 sx_sunlock(&tty_list_sx);
1887
1888 /* System console has no TTY associated. */
1889 if (dev_console->si_drv1 == NULL)
1890 return (ENXIO);
1891
1892 return (ttydev_open(dev, oflags, devtype, td));
1893 }
1894
1895 static int
1896 ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag)
1897 {
1898
1899 log_console(uio);
1900
1901 return (ttydev_write(dev, uio, ioflag));
1902 }
1903
1904 /*
1905 * /dev/console is a little different than normal TTY's. When opened,
1906 * it determines which TTY to use. When data gets written to it, it
1907 * will be logged in the kernel message buffer.
1908 */
1909 static struct cdevsw ttyconsdev_cdevsw = {
1910 .d_version = D_VERSION,
1911 .d_open = ttyconsdev_open,
1912 .d_close = ttydev_close,
1913 .d_read = ttydev_read,
1914 .d_write = ttyconsdev_write,
1915 .d_ioctl = ttydev_ioctl,
1916 .d_kqfilter = ttydev_kqfilter,
1917 .d_poll = ttydev_poll,
1918 .d_mmap = ttydev_mmap,
1919 .d_name = "ttyconsdev",
1920 .d_flags = D_TTY,
1921 };
1922
1923 static void
1924 ttyconsdev_init(void *unused)
1925 {
1926
1927 dev_console = make_dev(&ttyconsdev_cdevsw, 0, UID_ROOT, GID_WHEEL,
1928 0600, "console");
1929 }
1930
1931 SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL);
1932
1933 void
1934 ttyconsdev_select(const char *name)
1935 {
1936
1937 dev_console_filename = name;
1938 }
1939
1940 /*
1941 * Debugging routines.
1942 */
1943
1944 #include "opt_ddb.h"
1945 #ifdef DDB
1946 #include <ddb/ddb.h>
1947 #include <ddb/db_sym.h>
1948
1949 static struct {
1950 int flag;
1951 char val;
1952 } ttystates[] = {
1953 #if 0
1954 { TF_NOPREFIX, 'N' },
1955 #endif
1956 { TF_INITLOCK, 'I' },
1957 { TF_CALLOUT, 'C' },
1958
1959 /* Keep these together -> 'Oi' and 'Oo'. */
1960 { TF_OPENED, 'O' },
1961 { TF_OPENED_IN, 'i' },
1962 { TF_OPENED_OUT, 'o' },
1963 { TF_OPENED_CONS, 'c' },
1964
1965 { TF_GONE, 'G' },
1966 { TF_OPENCLOSE, 'B' },
1967 { TF_ASYNC, 'Y' },
1968 { TF_LITERAL, 'L' },
1969
1970 /* Keep these together -> 'Hi' and 'Ho'. */
1971 { TF_HIWAT, 'H' },
1972 { TF_HIWAT_IN, 'i' },
1973 { TF_HIWAT_OUT, 'o' },
1974
1975 { TF_STOPPED, 'S' },
1976 { TF_EXCLUDE, 'X' },
1977 { TF_BYPASS, 'l' },
1978 { TF_ZOMBIE, 'Z' },
1979 { TF_HOOK, 's' },
1980
1981 /* Keep these together -> 'bi' and 'bo'. */
1982 { TF_BUSY, 'b' },
1983 { TF_BUSY_IN, 'i' },
1984 { TF_BUSY_OUT, 'o' },
1985
1986 { 0, '\0'},
1987 };
1988
1989 #define TTY_FLAG_BITS \
1990 "\2\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \
1991 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \
1992 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK"
1993
1994 #define DB_PRINTSYM(name, addr) \
1995 db_printf("%s " #name ": ", sep); \
1996 db_printsym((db_addr_t) addr, DB_STGY_ANY); \
1997 db_printf("\n");
1998
1999 static void
2000 _db_show_devsw(const char *sep, const struct ttydevsw *tsw)
2001 {
2002 db_printf("%sdevsw: ", sep);
2003 db_printsym((db_addr_t)tsw, DB_STGY_ANY);
2004 db_printf(" (%p)\n", tsw);
2005 DB_PRINTSYM(open, tsw->tsw_open);
2006 DB_PRINTSYM(close, tsw->tsw_close);
2007 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup);
2008 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup);
2009 DB_PRINTSYM(ioctl, tsw->tsw_ioctl);
2010 DB_PRINTSYM(param, tsw->tsw_param);
2011 DB_PRINTSYM(modem, tsw->tsw_modem);
2012 DB_PRINTSYM(mmap, tsw->tsw_mmap);
2013 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify);
2014 DB_PRINTSYM(free, tsw->tsw_free);
2015 }
2016 static void
2017 _db_show_hooks(const char *sep, const struct ttyhook *th)
2018 {
2019 db_printf("%shook: ", sep);
2020 db_printsym((db_addr_t)th, DB_STGY_ANY);
2021 db_printf(" (%p)\n", th);
2022 if (th == NULL)
2023 return;
2024 DB_PRINTSYM(rint, th->th_rint);
2025 DB_PRINTSYM(rint_bypass, th->th_rint_bypass);
2026 DB_PRINTSYM(rint_done, th->th_rint_done);
2027 DB_PRINTSYM(rint_poll, th->th_rint_poll);
2028 DB_PRINTSYM(getc_inject, th->th_getc_inject);
2029 DB_PRINTSYM(getc_capture, th->th_getc_capture);
2030 DB_PRINTSYM(getc_poll, th->th_getc_poll);
2031 DB_PRINTSYM(close, th->th_close);
2032 }
2033
2034 static void
2035 _db_show_termios(const char *name, const struct termios *t)
2036 {
2037
2038 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x "
2039 "lflag 0x%x ispeed %u ospeed %u\n", name,
2040 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag,
2041 t->c_ispeed, t->c_ospeed);
2042 }
2043
2044 /* DDB command to show TTY statistics. */
2045 DB_SHOW_COMMAND(tty, db_show_tty)
2046 {
2047 struct tty *tp;
2048
2049 if (!have_addr) {
2050 db_printf("usage: show tty <addr>\n");
2051 return;
2052 }
2053 tp = (struct tty *)addr;
2054
2055 db_printf("0x%p: %s\n", tp, tty_devname(tp));
2056 db_printf("\tmtx: %p\n", tp->t_mtx);
2057 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS);
2058 db_printf("\trevokecnt: %u\n", tp->t_revokecnt);
2059
2060 /* Buffering mechanisms. */
2061 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u "
2062 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin,
2063 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end,
2064 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota);
2065 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n",
2066 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end,
2067 tp->t_outq.to_nblocks, tp->t_outq.to_quota);
2068 db_printf("\tinlow: %zu\n", tp->t_inlow);
2069 db_printf("\toutlow: %zu\n", tp->t_outlow);
2070 _db_show_termios("\ttermios", &tp->t_termios);
2071 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n",
2072 tp->t_winsize.ws_row, tp->t_winsize.ws_col,
2073 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel);
2074 db_printf("\tcolumn: %u\n", tp->t_column);
2075 db_printf("\twritepos: %u\n", tp->t_writepos);
2076 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags);
2077
2078 /* Init/lock-state devices. */
2079 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in);
2080 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out);
2081 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in);
2082 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out);
2083
2084 /* Hooks */
2085 _db_show_devsw("\t", tp->t_devsw);
2086 _db_show_hooks("\t", tp->t_hook);
2087
2088 /* Process info. */
2089 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp,
2090 tp->t_pgrp ? tp->t_pgrp->pg_id : 0,
2091 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0);
2092 db_printf("\tsession: %p", tp->t_session);
2093 if (tp->t_session != NULL)
2094 db_printf(" count %u leader %p tty %p sid %d login %s",
2095 tp->t_session->s_count, tp->t_session->s_leader,
2096 tp->t_session->s_ttyp, tp->t_session->s_sid,
2097 tp->t_session->s_login);
2098 db_printf("\n");
2099 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt);
2100 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc);
2101 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc);
2102 db_printf("\tdev: %p\n", tp->t_dev);
2103 }
2104
2105 /* DDB command to list TTYs. */
2106 DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys)
2107 {
2108 struct tty *tp;
2109 size_t isiz, osiz;
2110 int i, j;
2111
2112 /* Make the output look like `pstat -t'. */
2113 db_printf("PTR ");
2114 #if defined(__LP64__)
2115 db_printf(" ");
2116 #endif
2117 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW "
2118 "COL SESS PGID STATE\n");
2119
2120 TAILQ_FOREACH(tp, &tty_list, t_list) {
2121 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE;
2122 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE;
2123
2124 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ",
2125 tp,
2126 tty_devname(tp),
2127 isiz,
2128 tp->t_inq.ti_linestart - tp->t_inq.ti_begin,
2129 tp->t_inq.ti_end - tp->t_inq.ti_linestart,
2130 isiz - tp->t_inlow,
2131 osiz,
2132 tp->t_outq.to_end - tp->t_outq.to_begin,
2133 osiz - tp->t_outlow,
2134 MIN(tp->t_column, 99999),
2135 tp->t_session ? tp->t_session->s_sid : 0,
2136 tp->t_pgrp ? tp->t_pgrp->pg_id : 0);
2137
2138 /* Flag bits. */
2139 for (i = j = 0; ttystates[i].flag; i++)
2140 if (tp->t_flags & ttystates[i].flag) {
2141 db_printf("%c", ttystates[i].val);
2142 j++;
2143 }
2144 if (j == 0)
2145 db_printf("-");
2146 db_printf("\n");
2147 }
2148 }
2149 #endif /* DDB */
Cache object: e1aa9ced24f5827ffc24661d0abfc6c0
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