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/8.1/sys/kern/tty.c 202553 2010-01-18 09:04:53Z ed $");
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 destroy_dev_sched_cb(dev, tty_dealloc, tp);
1024 }
1025
1026 void
1027 tty_rel_pgrp(struct tty *tp, struct pgrp *pg)
1028 {
1029 MPASS(tp->t_sessioncnt > 0);
1030 tty_lock_assert(tp, MA_OWNED);
1031
1032 if (tp->t_pgrp == pg)
1033 tp->t_pgrp = NULL;
1034
1035 tty_unlock(tp);
1036 }
1037
1038 void
1039 tty_rel_sess(struct tty *tp, struct session *sess)
1040 {
1041 MPASS(tp->t_sessioncnt > 0);
1042
1043 /* Current session has left. */
1044 if (tp->t_session == sess) {
1045 tp->t_session = NULL;
1046 MPASS(tp->t_pgrp == NULL);
1047 }
1048 tp->t_sessioncnt--;
1049 tty_rel_free(tp);
1050 }
1051
1052 void
1053 tty_rel_gone(struct tty *tp)
1054 {
1055 MPASS(!tty_gone(tp));
1056
1057 /* Simulate carrier removal. */
1058 ttydisc_modem(tp, 0);
1059
1060 /* Wake up all blocked threads. */
1061 tty_wakeup(tp, FREAD|FWRITE);
1062 cv_broadcast(&tp->t_bgwait);
1063 cv_broadcast(&tp->t_dcdwait);
1064
1065 tp->t_flags |= TF_GONE;
1066 tty_rel_free(tp);
1067 }
1068
1069 /*
1070 * Exposing information about current TTY's through sysctl
1071 */
1072
1073 static void
1074 tty_to_xtty(struct tty *tp, struct xtty *xt)
1075 {
1076 tty_lock_assert(tp, MA_OWNED);
1077
1078 xt->xt_size = sizeof(struct xtty);
1079 xt->xt_insize = ttyinq_getsize(&tp->t_inq);
1080 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq);
1081 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq);
1082 xt->xt_inlow = tp->t_inlow;
1083 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq);
1084 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq);
1085 xt->xt_outlow = tp->t_outlow;
1086 xt->xt_column = tp->t_column;
1087 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
1088 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0;
1089 xt->xt_flags = tp->t_flags;
1090 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV;
1091 }
1092
1093 static int
1094 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
1095 {
1096 unsigned long lsize;
1097 struct xtty *xtlist, *xt;
1098 struct tty *tp;
1099 int error;
1100
1101 sx_slock(&tty_list_sx);
1102 lsize = tty_list_count * sizeof(struct xtty);
1103 if (lsize == 0) {
1104 sx_sunlock(&tty_list_sx);
1105 return (0);
1106 }
1107
1108 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK);
1109
1110 TAILQ_FOREACH(tp, &tty_list, t_list) {
1111 tty_lock(tp);
1112 tty_to_xtty(tp, xt);
1113 tty_unlock(tp);
1114 xt++;
1115 }
1116 sx_sunlock(&tty_list_sx);
1117
1118 error = SYSCTL_OUT(req, xtlist, lsize);
1119 free(xtlist, M_TTY);
1120 return (error);
1121 }
1122
1123 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
1124 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs");
1125
1126 /*
1127 * Device node creation. Device has been set up, now we can expose it to
1128 * the user.
1129 */
1130
1131 void
1132 tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...)
1133 {
1134 va_list ap;
1135 struct cdev *dev;
1136 const char *prefix = "tty";
1137 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */
1138 uid_t uid;
1139 gid_t gid;
1140 mode_t mode;
1141
1142 /* Remove "tty" prefix from devices like PTY's. */
1143 if (tp->t_flags & TF_NOPREFIX)
1144 prefix = "";
1145
1146 va_start(ap, fmt);
1147 vsnrprintf(name, sizeof name, 32, fmt, ap);
1148 va_end(ap);
1149
1150 if (cred == NULL) {
1151 /* System device. */
1152 uid = UID_ROOT;
1153 gid = GID_WHEEL;
1154 mode = S_IRUSR|S_IWUSR;
1155 } else {
1156 /* User device. */
1157 uid = cred->cr_ruid;
1158 gid = GID_TTY;
1159 mode = S_IRUSR|S_IWUSR|S_IWGRP;
1160 }
1161
1162 /* Master call-in device. */
1163 dev = make_dev_cred(&ttydev_cdevsw, 0, cred,
1164 uid, gid, mode, "%s%s", prefix, name);
1165 dev->si_drv1 = tp;
1166 tp->t_dev = dev;
1167
1168 /* Slave call-in devices. */
1169 if (tp->t_flags & TF_INITLOCK) {
1170 dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1171 uid, gid, mode, "%s%s.init", prefix, name);
1172 dev_depends(tp->t_dev, dev);
1173 dev->si_drv1 = tp;
1174 dev->si_drv2 = &tp->t_termios_init_in;
1175
1176 dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1177 uid, gid, mode, "%s%s.lock", prefix, name);
1178 dev_depends(tp->t_dev, dev);
1179 dev->si_drv1 = tp;
1180 dev->si_drv2 = &tp->t_termios_lock_in;
1181 }
1182
1183 /* Call-out devices. */
1184 if (tp->t_flags & TF_CALLOUT) {
1185 dev = make_dev_cred(&ttydev_cdevsw, 0, cred,
1186 UID_UUCP, GID_DIALER, 0660, "cua%s", name);
1187 dev_depends(tp->t_dev, dev);
1188 dev->si_drv1 = tp;
1189
1190 /* Slave call-out devices. */
1191 if (tp->t_flags & TF_INITLOCK) {
1192 dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1193 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name);
1194 dev_depends(tp->t_dev, dev);
1195 dev->si_drv1 = tp;
1196 dev->si_drv2 = &tp->t_termios_init_out;
1197
1198 dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1199 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name);
1200 dev_depends(tp->t_dev, dev);
1201 dev->si_drv1 = tp;
1202 dev->si_drv2 = &tp->t_termios_lock_out;
1203 }
1204 }
1205 }
1206
1207 /*
1208 * Signalling processes.
1209 */
1210
1211 void
1212 tty_signal_sessleader(struct tty *tp, int sig)
1213 {
1214 struct proc *p;
1215
1216 tty_lock_assert(tp, MA_OWNED);
1217 MPASS(sig >= 1 && sig < NSIG);
1218
1219 /* Make signals start output again. */
1220 tp->t_flags &= ~TF_STOPPED;
1221
1222 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) {
1223 p = tp->t_session->s_leader;
1224 PROC_LOCK(p);
1225 psignal(p, sig);
1226 PROC_UNLOCK(p);
1227 }
1228 }
1229
1230 void
1231 tty_signal_pgrp(struct tty *tp, int sig)
1232 {
1233 ksiginfo_t ksi;
1234
1235 tty_lock_assert(tp, MA_OWNED);
1236 MPASS(sig >= 1 && sig < NSIG);
1237
1238 /* Make signals start output again. */
1239 tp->t_flags &= ~TF_STOPPED;
1240
1241 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO))
1242 tty_info(tp);
1243 if (tp->t_pgrp != NULL) {
1244 ksiginfo_init(&ksi);
1245 ksi.ksi_signo = sig;
1246 ksi.ksi_code = SI_KERNEL;
1247 PGRP_LOCK(tp->t_pgrp);
1248 pgsignal(tp->t_pgrp, sig, 1, &ksi);
1249 PGRP_UNLOCK(tp->t_pgrp);
1250 }
1251 }
1252
1253 void
1254 tty_wakeup(struct tty *tp, int flags)
1255 {
1256 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL)
1257 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL));
1258
1259 if (flags & FWRITE) {
1260 cv_broadcast(&tp->t_outwait);
1261 selwakeup(&tp->t_outpoll);
1262 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0);
1263 }
1264 if (flags & FREAD) {
1265 cv_broadcast(&tp->t_inwait);
1266 selwakeup(&tp->t_inpoll);
1267 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0);
1268 }
1269 }
1270
1271 int
1272 tty_wait(struct tty *tp, struct cv *cv)
1273 {
1274 int error;
1275 int revokecnt = tp->t_revokecnt;
1276
1277 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED);
1278 MPASS(!tty_gone(tp));
1279
1280 error = cv_wait_sig(cv, tp->t_mtx);
1281
1282 /* Restart the system call when we may have been revoked. */
1283 if (tp->t_revokecnt != revokecnt)
1284 return (ERESTART);
1285
1286 /* Bail out when the device slipped away. */
1287 if (tty_gone(tp))
1288 return (ENXIO);
1289
1290 return (error);
1291 }
1292
1293 int
1294 tty_timedwait(struct tty *tp, struct cv *cv, int hz)
1295 {
1296 int error;
1297 int revokecnt = tp->t_revokecnt;
1298
1299 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED);
1300 MPASS(!tty_gone(tp));
1301
1302 error = cv_timedwait_sig(cv, tp->t_mtx, hz);
1303
1304 /* Restart the system call when we may have been revoked. */
1305 if (tp->t_revokecnt != revokecnt)
1306 return (ERESTART);
1307
1308 /* Bail out when the device slipped away. */
1309 if (tty_gone(tp))
1310 return (ENXIO);
1311
1312 return (error);
1313 }
1314
1315 void
1316 tty_flush(struct tty *tp, int flags)
1317 {
1318 if (flags & FWRITE) {
1319 tp->t_flags &= ~TF_HIWAT_OUT;
1320 ttyoutq_flush(&tp->t_outq);
1321 tty_wakeup(tp, FWRITE);
1322 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE);
1323 }
1324 if (flags & FREAD) {
1325 tty_hiwat_in_unblock(tp);
1326 ttyinq_flush(&tp->t_inq);
1327 ttydevsw_inwakeup(tp);
1328 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD);
1329 }
1330 }
1331
1332 static int
1333 tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag,
1334 struct thread *td)
1335 {
1336 int error;
1337
1338 switch (cmd) {
1339 /*
1340 * Modem commands.
1341 * The SER_* and TIOCM_* flags are the same, but one bit
1342 * shifted. I don't know why.
1343 */
1344 case TIOCSDTR:
1345 ttydevsw_modem(tp, SER_DTR, 0);
1346 return (0);
1347 case TIOCCDTR:
1348 ttydevsw_modem(tp, 0, SER_DTR);
1349 return (0);
1350 case TIOCMSET: {
1351 int bits = *(int *)data;
1352 ttydevsw_modem(tp,
1353 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1,
1354 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1);
1355 return (0);
1356 }
1357 case TIOCMBIS: {
1358 int bits = *(int *)data;
1359 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0);
1360 return (0);
1361 }
1362 case TIOCMBIC: {
1363 int bits = *(int *)data;
1364 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1);
1365 return (0);
1366 }
1367 case TIOCMGET:
1368 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1);
1369 return (0);
1370
1371 case FIOASYNC:
1372 if (*(int *)data)
1373 tp->t_flags |= TF_ASYNC;
1374 else
1375 tp->t_flags &= ~TF_ASYNC;
1376 return (0);
1377 case FIONBIO:
1378 /* This device supports non-blocking operation. */
1379 return (0);
1380 case FIONREAD:
1381 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq);
1382 return (0);
1383 case FIONWRITE:
1384 case TIOCOUTQ:
1385 *(int *)data = ttyoutq_bytesused(&tp->t_outq);
1386 return (0);
1387 case FIOSETOWN:
1388 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc))
1389 /* Not allowed to set ownership. */
1390 return (ENOTTY);
1391
1392 /* Temporarily unlock the TTY to set ownership. */
1393 tty_unlock(tp);
1394 error = fsetown(*(int *)data, &tp->t_sigio);
1395 tty_lock(tp);
1396 return (error);
1397 case FIOGETOWN:
1398 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc))
1399 /* Not allowed to set ownership. */
1400 return (ENOTTY);
1401
1402 /* Get ownership. */
1403 *(int *)data = fgetown(&tp->t_sigio);
1404 return (0);
1405 case TIOCGETA:
1406 /* Obtain terminal flags through tcgetattr(). */
1407 *(struct termios*)data = tp->t_termios;
1408 return (0);
1409 case TIOCSETA:
1410 case TIOCSETAW:
1411 case TIOCSETAF: {
1412 struct termios *t = data;
1413
1414 /*
1415 * Who makes up these funny rules? According to POSIX,
1416 * input baud rate is set equal to the output baud rate
1417 * when zero.
1418 */
1419 if (t->c_ispeed == 0)
1420 t->c_ispeed = t->c_ospeed;
1421
1422 /* Discard any unsupported bits. */
1423 t->c_iflag &= TTYSUP_IFLAG;
1424 t->c_oflag &= TTYSUP_OFLAG;
1425 t->c_lflag &= TTYSUP_LFLAG;
1426 t->c_cflag &= TTYSUP_CFLAG;
1427
1428 /* Set terminal flags through tcsetattr(). */
1429 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
1430 error = tty_drain(tp);
1431 if (error)
1432 return (error);
1433 if (cmd == TIOCSETAF)
1434 tty_flush(tp, FREAD);
1435 }
1436
1437 /*
1438 * Only call param() when the flags really change.
1439 */
1440 if ((t->c_cflag & CIGNORE) == 0 &&
1441 (tp->t_termios.c_cflag != t->c_cflag ||
1442 tp->t_termios.c_ispeed != t->c_ispeed ||
1443 tp->t_termios.c_ospeed != t->c_ospeed)) {
1444 error = ttydevsw_param(tp, t);
1445 if (error)
1446 return (error);
1447
1448 /* XXX: CLOCAL? */
1449
1450 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE;
1451 tp->t_termios.c_ispeed = t->c_ispeed;
1452 tp->t_termios.c_ospeed = t->c_ospeed;
1453
1454 /* Baud rate has changed - update watermarks. */
1455 tty_watermarks(tp);
1456 }
1457
1458 /* Copy new non-device driver parameters. */
1459 tp->t_termios.c_iflag = t->c_iflag;
1460 tp->t_termios.c_oflag = t->c_oflag;
1461 tp->t_termios.c_lflag = t->c_lflag;
1462 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc);
1463
1464 ttydisc_optimize(tp);
1465
1466 if ((t->c_lflag & ICANON) == 0) {
1467 /*
1468 * When in non-canonical mode, wake up all
1469 * readers. Canonicalize any partial input. VMIN
1470 * and VTIME could also be adjusted.
1471 */
1472 ttyinq_canonicalize(&tp->t_inq);
1473 tty_wakeup(tp, FREAD);
1474 }
1475
1476 /*
1477 * For packet mode: notify the PTY consumer that VSTOP
1478 * and VSTART may have been changed.
1479 */
1480 if (tp->t_termios.c_iflag & IXON &&
1481 tp->t_termios.c_cc[VSTOP] == CTRL('S') &&
1482 tp->t_termios.c_cc[VSTART] == CTRL('Q'))
1483 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP);
1484 else
1485 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP);
1486 return (0);
1487 }
1488 case TIOCGETD:
1489 /* For compatibility - we only support TTYDISC. */
1490 *(int *)data = TTYDISC;
1491 return (0);
1492 case TIOCGPGRP:
1493 if (!tty_is_ctty(tp, td->td_proc))
1494 return (ENOTTY);
1495
1496 if (tp->t_pgrp != NULL)
1497 *(int *)data = tp->t_pgrp->pg_id;
1498 else
1499 *(int *)data = NO_PID;
1500 return (0);
1501 case TIOCGSID:
1502 if (!tty_is_ctty(tp, td->td_proc))
1503 return (ENOTTY);
1504
1505 MPASS(tp->t_session);
1506 *(int *)data = tp->t_session->s_sid;
1507 return (0);
1508 case TIOCSCTTY: {
1509 struct proc *p = td->td_proc;
1510
1511 /* XXX: This looks awful. */
1512 tty_unlock(tp);
1513 sx_xlock(&proctree_lock);
1514 tty_lock(tp);
1515
1516 if (!SESS_LEADER(p)) {
1517 /* Only the session leader may do this. */
1518 sx_xunlock(&proctree_lock);
1519 return (EPERM);
1520 }
1521
1522 if (tp->t_session != NULL && tp->t_session == p->p_session) {
1523 /* This is already our controlling TTY. */
1524 sx_xunlock(&proctree_lock);
1525 return (0);
1526 }
1527
1528 if (p->p_session->s_ttyp != NULL ||
1529 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL &&
1530 tp->t_session->s_ttyvp->v_type != VBAD)) {
1531 /*
1532 * There is already a relation between a TTY and
1533 * a session, or the caller is not the session
1534 * leader.
1535 *
1536 * Allow the TTY to be stolen when the vnode is
1537 * invalid, but the reference to the TTY is
1538 * still active. This allows immediate reuse of
1539 * TTYs of which the session leader has been
1540 * killed or the TTY revoked.
1541 */
1542 sx_xunlock(&proctree_lock);
1543 return (EPERM);
1544 }
1545
1546 /* Connect the session to the TTY. */
1547 tp->t_session = p->p_session;
1548 tp->t_session->s_ttyp = tp;
1549 tp->t_sessioncnt++;
1550 sx_xunlock(&proctree_lock);
1551
1552 /* Assign foreground process group. */
1553 tp->t_pgrp = p->p_pgrp;
1554 PROC_LOCK(p);
1555 p->p_flag |= P_CONTROLT;
1556 PROC_UNLOCK(p);
1557
1558 return (0);
1559 }
1560 case TIOCSPGRP: {
1561 struct pgrp *pg;
1562
1563 /*
1564 * XXX: Temporarily unlock the TTY to locate the process
1565 * group. This code would be lot nicer if we would ever
1566 * decompose proctree_lock.
1567 */
1568 tty_unlock(tp);
1569 sx_slock(&proctree_lock);
1570 pg = pgfind(*(int *)data);
1571 if (pg != NULL)
1572 PGRP_UNLOCK(pg);
1573 if (pg == NULL || pg->pg_session != td->td_proc->p_session) {
1574 sx_sunlock(&proctree_lock);
1575 tty_lock(tp);
1576 return (EPERM);
1577 }
1578 tty_lock(tp);
1579
1580 /*
1581 * Determine if this TTY is the controlling TTY after
1582 * relocking the TTY.
1583 */
1584 if (!tty_is_ctty(tp, td->td_proc)) {
1585 sx_sunlock(&proctree_lock);
1586 return (ENOTTY);
1587 }
1588 tp->t_pgrp = pg;
1589 sx_sunlock(&proctree_lock);
1590
1591 /* Wake up the background process groups. */
1592 cv_broadcast(&tp->t_bgwait);
1593 return (0);
1594 }
1595 case TIOCFLUSH: {
1596 int flags = *(int *)data;
1597
1598 if (flags == 0)
1599 flags = (FREAD|FWRITE);
1600 else
1601 flags &= (FREAD|FWRITE);
1602 tty_flush(tp, flags);
1603 return (0);
1604 }
1605 case TIOCDRAIN:
1606 /* Drain TTY output. */
1607 return tty_drain(tp);
1608 case TIOCCONS:
1609 /* Set terminal as console TTY. */
1610 if (*(int *)data) {
1611 error = priv_check(td, PRIV_TTY_CONSOLE);
1612 if (error)
1613 return (error);
1614
1615 /*
1616 * XXX: constty should really need to be locked!
1617 * XXX: allow disconnected constty's to be stolen!
1618 */
1619
1620 if (constty == tp)
1621 return (0);
1622 if (constty != NULL)
1623 return (EBUSY);
1624
1625 tty_unlock(tp);
1626 constty_set(tp);
1627 tty_lock(tp);
1628 } else if (constty == tp) {
1629 constty_clear();
1630 }
1631 return (0);
1632 case TIOCGWINSZ:
1633 /* Obtain window size. */
1634 *(struct winsize*)data = tp->t_winsize;
1635 return (0);
1636 case TIOCSWINSZ:
1637 /* Set window size. */
1638 if (bcmp(&tp->t_winsize, data, sizeof(struct winsize)) == 0)
1639 return (0);
1640 tp->t_winsize = *(struct winsize*)data;
1641 tty_signal_pgrp(tp, SIGWINCH);
1642 return (0);
1643 case TIOCEXCL:
1644 tp->t_flags |= TF_EXCLUDE;
1645 return (0);
1646 case TIOCNXCL:
1647 tp->t_flags &= ~TF_EXCLUDE;
1648 return (0);
1649 case TIOCSTOP:
1650 tp->t_flags |= TF_STOPPED;
1651 ttydevsw_pktnotify(tp, TIOCPKT_STOP);
1652 return (0);
1653 case TIOCSTART:
1654 tp->t_flags &= ~TF_STOPPED;
1655 ttydevsw_outwakeup(tp);
1656 ttydevsw_pktnotify(tp, TIOCPKT_START);
1657 return (0);
1658 case TIOCSTAT:
1659 tty_info(tp);
1660 return (0);
1661 case TIOCSTI:
1662 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI))
1663 return (EPERM);
1664 if (!tty_is_ctty(tp, td->td_proc) &&
1665 priv_check(td, PRIV_TTY_STI))
1666 return (EACCES);
1667 ttydisc_rint(tp, *(char *)data, 0);
1668 ttydisc_rint_done(tp);
1669 return (0);
1670 }
1671
1672 #ifdef COMPAT_43TTY
1673 return tty_ioctl_compat(tp, cmd, data, fflag, td);
1674 #else /* !COMPAT_43TTY */
1675 return (ENOIOCTL);
1676 #endif /* COMPAT_43TTY */
1677 }
1678
1679 int
1680 tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td)
1681 {
1682 int error;
1683
1684 tty_lock_assert(tp, MA_OWNED);
1685
1686 if (tty_gone(tp))
1687 return (ENXIO);
1688
1689 error = ttydevsw_ioctl(tp, cmd, data, td);
1690 if (error == ENOIOCTL)
1691 error = tty_generic_ioctl(tp, cmd, data, fflag, td);
1692
1693 return (error);
1694 }
1695
1696 dev_t
1697 tty_udev(struct tty *tp)
1698 {
1699 if (tp->t_dev)
1700 return dev2udev(tp->t_dev);
1701 else
1702 return NODEV;
1703 }
1704
1705 int
1706 tty_checkoutq(struct tty *tp)
1707 {
1708
1709 /* 256 bytes should be enough to print a log message. */
1710 return (ttyoutq_bytesleft(&tp->t_outq) >= 256);
1711 }
1712
1713 void
1714 tty_hiwat_in_block(struct tty *tp)
1715 {
1716
1717 if ((tp->t_flags & TF_HIWAT_IN) == 0 &&
1718 tp->t_termios.c_iflag & IXOFF &&
1719 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) {
1720 /*
1721 * Input flow control. Only enter the high watermark when we
1722 * can successfully store the VSTOP character.
1723 */
1724 if (ttyoutq_write_nofrag(&tp->t_outq,
1725 &tp->t_termios.c_cc[VSTOP], 1) == 0)
1726 tp->t_flags |= TF_HIWAT_IN;
1727 } else {
1728 /* No input flow control. */
1729 tp->t_flags |= TF_HIWAT_IN;
1730 }
1731 }
1732
1733 void
1734 tty_hiwat_in_unblock(struct tty *tp)
1735 {
1736
1737 if (tp->t_flags & TF_HIWAT_IN &&
1738 tp->t_termios.c_iflag & IXOFF &&
1739 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) {
1740 /*
1741 * Input flow control. Only leave the high watermark when we
1742 * can successfully store the VSTART character.
1743 */
1744 if (ttyoutq_write_nofrag(&tp->t_outq,
1745 &tp->t_termios.c_cc[VSTART], 1) == 0)
1746 tp->t_flags &= ~TF_HIWAT_IN;
1747 } else {
1748 /* No input flow control. */
1749 tp->t_flags &= ~TF_HIWAT_IN;
1750 }
1751
1752 if (!tty_gone(tp))
1753 ttydevsw_inwakeup(tp);
1754 }
1755
1756 /*
1757 * TTY hooks interface.
1758 */
1759
1760 static int
1761 ttyhook_defrint(struct tty *tp, char c, int flags)
1762 {
1763
1764 if (ttyhook_rint_bypass(tp, &c, 1) != 1)
1765 return (-1);
1766
1767 return (0);
1768 }
1769
1770 int
1771 ttyhook_register(struct tty **rtp, struct proc *p, int fd,
1772 struct ttyhook *th, void *softc)
1773 {
1774 struct tty *tp;
1775 struct file *fp;
1776 struct cdev *dev;
1777 struct cdevsw *cdp;
1778 struct filedesc *fdp;
1779 int error;
1780
1781 /* Validate the file descriptor. */
1782 if ((fdp = p->p_fd) == NULL)
1783 return (EBADF);
1784
1785 fp = fget_unlocked(fdp, fd);
1786 if (fp == NULL)
1787 return (EBADF);
1788 if (fp->f_ops == &badfileops) {
1789 error = EBADF;
1790 goto done1;
1791 }
1792
1793 /*
1794 * Make sure the vnode is bound to a character device.
1795 * Unlocked check for the vnode type is ok there, because we
1796 * only shall prevent calling devvn_refthread on the file that
1797 * never has been opened over a character device.
1798 */
1799 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) {
1800 error = EINVAL;
1801 goto done1;
1802 }
1803
1804 /* Make sure it is a TTY. */
1805 cdp = devvn_refthread(fp->f_vnode, &dev);
1806 if (cdp == NULL) {
1807 error = ENXIO;
1808 goto done1;
1809 }
1810 if (dev != fp->f_data) {
1811 error = ENXIO;
1812 goto done2;
1813 }
1814 if (cdp != &ttydev_cdevsw) {
1815 error = ENOTTY;
1816 goto done2;
1817 }
1818 tp = dev->si_drv1;
1819
1820 /* Try to attach the hook to the TTY. */
1821 error = EBUSY;
1822 tty_lock(tp);
1823 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0));
1824 if (tp->t_flags & TF_HOOK)
1825 goto done3;
1826
1827 tp->t_flags |= TF_HOOK;
1828 tp->t_hook = th;
1829 tp->t_hooksoftc = softc;
1830 *rtp = tp;
1831 error = 0;
1832
1833 /* Maybe we can switch into bypass mode now. */
1834 ttydisc_optimize(tp);
1835
1836 /* Silently convert rint() calls to rint_bypass() when possible. */
1837 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass))
1838 th->th_rint = ttyhook_defrint;
1839
1840 done3: tty_unlock(tp);
1841 done2: dev_relthread(dev);
1842 done1: fdrop(fp, curthread);
1843 return (error);
1844 }
1845
1846 void
1847 ttyhook_unregister(struct tty *tp)
1848 {
1849
1850 tty_lock_assert(tp, MA_OWNED);
1851 MPASS(tp->t_flags & TF_HOOK);
1852
1853 /* Disconnect the hook. */
1854 tp->t_flags &= ~TF_HOOK;
1855 tp->t_hook = NULL;
1856
1857 /* Maybe we need to leave bypass mode. */
1858 ttydisc_optimize(tp);
1859
1860 /* Maybe deallocate the TTY as well. */
1861 tty_rel_free(tp);
1862 }
1863
1864 /*
1865 * /dev/console handling.
1866 */
1867
1868 static int
1869 ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
1870 {
1871 struct tty *tp;
1872
1873 /* System has no console device. */
1874 if (dev_console_filename == NULL)
1875 return (ENXIO);
1876
1877 /* Look up corresponding TTY by device name. */
1878 sx_slock(&tty_list_sx);
1879 TAILQ_FOREACH(tp, &tty_list, t_list) {
1880 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) {
1881 dev_console->si_drv1 = tp;
1882 break;
1883 }
1884 }
1885 sx_sunlock(&tty_list_sx);
1886
1887 /* System console has no TTY associated. */
1888 if (dev_console->si_drv1 == NULL)
1889 return (ENXIO);
1890
1891 return (ttydev_open(dev, oflags, devtype, td));
1892 }
1893
1894 static int
1895 ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag)
1896 {
1897
1898 log_console(uio);
1899
1900 return (ttydev_write(dev, uio, ioflag));
1901 }
1902
1903 /*
1904 * /dev/console is a little different than normal TTY's. When opened,
1905 * it determines which TTY to use. When data gets written to it, it
1906 * will be logged in the kernel message buffer.
1907 */
1908 static struct cdevsw ttyconsdev_cdevsw = {
1909 .d_version = D_VERSION,
1910 .d_open = ttyconsdev_open,
1911 .d_close = ttydev_close,
1912 .d_read = ttydev_read,
1913 .d_write = ttyconsdev_write,
1914 .d_ioctl = ttydev_ioctl,
1915 .d_kqfilter = ttydev_kqfilter,
1916 .d_poll = ttydev_poll,
1917 .d_mmap = ttydev_mmap,
1918 .d_name = "ttyconsdev",
1919 .d_flags = D_TTY,
1920 };
1921
1922 static void
1923 ttyconsdev_init(void *unused)
1924 {
1925
1926 dev_console = make_dev(&ttyconsdev_cdevsw, 0, UID_ROOT, GID_WHEEL,
1927 0600, "console");
1928 }
1929
1930 SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL);
1931
1932 void
1933 ttyconsdev_select(const char *name)
1934 {
1935
1936 dev_console_filename = name;
1937 }
1938
1939 /*
1940 * Debugging routines.
1941 */
1942
1943 #include "opt_ddb.h"
1944 #ifdef DDB
1945 #include <ddb/ddb.h>
1946 #include <ddb/db_sym.h>
1947
1948 static struct {
1949 int flag;
1950 char val;
1951 } ttystates[] = {
1952 #if 0
1953 { TF_NOPREFIX, 'N' },
1954 #endif
1955 { TF_INITLOCK, 'I' },
1956 { TF_CALLOUT, 'C' },
1957
1958 /* Keep these together -> 'Oi' and 'Oo'. */
1959 { TF_OPENED, 'O' },
1960 { TF_OPENED_IN, 'i' },
1961 { TF_OPENED_OUT, 'o' },
1962 { TF_OPENED_CONS, 'c' },
1963
1964 { TF_GONE, 'G' },
1965 { TF_OPENCLOSE, 'B' },
1966 { TF_ASYNC, 'Y' },
1967 { TF_LITERAL, 'L' },
1968
1969 /* Keep these together -> 'Hi' and 'Ho'. */
1970 { TF_HIWAT, 'H' },
1971 { TF_HIWAT_IN, 'i' },
1972 { TF_HIWAT_OUT, 'o' },
1973
1974 { TF_STOPPED, 'S' },
1975 { TF_EXCLUDE, 'X' },
1976 { TF_BYPASS, 'l' },
1977 { TF_ZOMBIE, 'Z' },
1978 { TF_HOOK, 's' },
1979
1980 /* Keep these together -> 'bi' and 'bo'. */
1981 { TF_BUSY, 'b' },
1982 { TF_BUSY_IN, 'i' },
1983 { TF_BUSY_OUT, 'o' },
1984
1985 { 0, '\0'},
1986 };
1987
1988 #define TTY_FLAG_BITS \
1989 "\2\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \
1990 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \
1991 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK"
1992
1993 #define DB_PRINTSYM(name, addr) \
1994 db_printf("%s " #name ": ", sep); \
1995 db_printsym((db_addr_t) addr, DB_STGY_ANY); \
1996 db_printf("\n");
1997
1998 static void
1999 _db_show_devsw(const char *sep, const struct ttydevsw *tsw)
2000 {
2001 db_printf("%sdevsw: ", sep);
2002 db_printsym((db_addr_t)tsw, DB_STGY_ANY);
2003 db_printf(" (%p)\n", tsw);
2004 DB_PRINTSYM(open, tsw->tsw_open);
2005 DB_PRINTSYM(close, tsw->tsw_close);
2006 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup);
2007 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup);
2008 DB_PRINTSYM(ioctl, tsw->tsw_ioctl);
2009 DB_PRINTSYM(param, tsw->tsw_param);
2010 DB_PRINTSYM(modem, tsw->tsw_modem);
2011 DB_PRINTSYM(mmap, tsw->tsw_mmap);
2012 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify);
2013 DB_PRINTSYM(free, tsw->tsw_free);
2014 }
2015 static void
2016 _db_show_hooks(const char *sep, const struct ttyhook *th)
2017 {
2018 db_printf("%shook: ", sep);
2019 db_printsym((db_addr_t)th, DB_STGY_ANY);
2020 db_printf(" (%p)\n", th);
2021 if (th == NULL)
2022 return;
2023 DB_PRINTSYM(rint, th->th_rint);
2024 DB_PRINTSYM(rint_bypass, th->th_rint_bypass);
2025 DB_PRINTSYM(rint_done, th->th_rint_done);
2026 DB_PRINTSYM(rint_poll, th->th_rint_poll);
2027 DB_PRINTSYM(getc_inject, th->th_getc_inject);
2028 DB_PRINTSYM(getc_capture, th->th_getc_capture);
2029 DB_PRINTSYM(getc_poll, th->th_getc_poll);
2030 DB_PRINTSYM(close, th->th_close);
2031 }
2032
2033 static void
2034 _db_show_termios(const char *name, const struct termios *t)
2035 {
2036
2037 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x "
2038 "lflag 0x%x ispeed %u ospeed %u\n", name,
2039 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag,
2040 t->c_ispeed, t->c_ospeed);
2041 }
2042
2043 /* DDB command to show TTY statistics. */
2044 DB_SHOW_COMMAND(tty, db_show_tty)
2045 {
2046 struct tty *tp;
2047
2048 if (!have_addr) {
2049 db_printf("usage: show tty <addr>\n");
2050 return;
2051 }
2052 tp = (struct tty *)addr;
2053
2054 db_printf("0x%p: %s\n", tp, tty_devname(tp));
2055 db_printf("\tmtx: %p\n", tp->t_mtx);
2056 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS);
2057 db_printf("\trevokecnt: %u\n", tp->t_revokecnt);
2058
2059 /* Buffering mechanisms. */
2060 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u "
2061 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin,
2062 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end,
2063 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota);
2064 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n",
2065 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end,
2066 tp->t_outq.to_nblocks, tp->t_outq.to_quota);
2067 db_printf("\tinlow: %zu\n", tp->t_inlow);
2068 db_printf("\toutlow: %zu\n", tp->t_outlow);
2069 _db_show_termios("\ttermios", &tp->t_termios);
2070 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n",
2071 tp->t_winsize.ws_row, tp->t_winsize.ws_col,
2072 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel);
2073 db_printf("\tcolumn: %u\n", tp->t_column);
2074 db_printf("\twritepos: %u\n", tp->t_writepos);
2075 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags);
2076
2077 /* Init/lock-state devices. */
2078 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in);
2079 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out);
2080 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in);
2081 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out);
2082
2083 /* Hooks */
2084 _db_show_devsw("\t", tp->t_devsw);
2085 _db_show_hooks("\t", tp->t_hook);
2086
2087 /* Process info. */
2088 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp,
2089 tp->t_pgrp ? tp->t_pgrp->pg_id : 0,
2090 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0);
2091 db_printf("\tsession: %p", tp->t_session);
2092 if (tp->t_session != NULL)
2093 db_printf(" count %u leader %p tty %p sid %d login %s",
2094 tp->t_session->s_count, tp->t_session->s_leader,
2095 tp->t_session->s_ttyp, tp->t_session->s_sid,
2096 tp->t_session->s_login);
2097 db_printf("\n");
2098 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt);
2099 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc);
2100 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc);
2101 db_printf("\tdev: %p\n", tp->t_dev);
2102 }
2103
2104 /* DDB command to list TTYs. */
2105 DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys)
2106 {
2107 struct tty *tp;
2108 size_t isiz, osiz;
2109 int i, j;
2110
2111 /* Make the output look like `pstat -t'. */
2112 db_printf("PTR ");
2113 #if defined(__LP64__)
2114 db_printf(" ");
2115 #endif
2116 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW "
2117 "COL SESS PGID STATE\n");
2118
2119 TAILQ_FOREACH(tp, &tty_list, t_list) {
2120 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE;
2121 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE;
2122
2123 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ",
2124 tp,
2125 tty_devname(tp),
2126 isiz,
2127 tp->t_inq.ti_linestart - tp->t_inq.ti_begin,
2128 tp->t_inq.ti_end - tp->t_inq.ti_linestart,
2129 isiz - tp->t_inlow,
2130 osiz,
2131 tp->t_outq.to_end - tp->t_outq.to_begin,
2132 osiz - tp->t_outlow,
2133 MIN(tp->t_column, 99999),
2134 tp->t_session ? tp->t_session->s_sid : 0,
2135 tp->t_pgrp ? tp->t_pgrp->pg_id : 0);
2136
2137 /* Flag bits. */
2138 for (i = j = 0; ttystates[i].flag; i++)
2139 if (tp->t_flags & ttystates[i].flag) {
2140 db_printf("%c", ttystates[i].val);
2141 j++;
2142 }
2143 if (j == 0)
2144 db_printf("-");
2145 db_printf("\n");
2146 }
2147 }
2148 #endif /* DDB */
Cache object: 1ce14c6ea6eecbd7b72d49c696637e1d
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