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/8.4/sys/kern/tty.c 237780 2012-06-29 14:14:49Z pho $");
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;
220 int error = 0;
221
222 while ((tp = dev->si_drv1) == NULL) {
223 error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1);
224 if (error != EWOULDBLOCK)
225 return (error);
226 }
227
228 tty_lock(tp);
229 if (tty_gone(tp)) {
230 /* Device is already gone. */
231 tty_unlock(tp);
232 return (ENXIO);
233 }
234
235 /*
236 * Block when other processes are currently opening or closing
237 * the TTY.
238 */
239 while (tp->t_flags & TF_OPENCLOSE) {
240 error = tty_wait(tp, &tp->t_dcdwait);
241 if (error != 0) {
242 tty_unlock(tp);
243 return (error);
244 }
245 }
246 tp->t_flags |= TF_OPENCLOSE;
247
248 /*
249 * Make sure the "tty" and "cua" device cannot be opened at the
250 * same time.
251 */
252 if (TTY_CALLOUT(tp, dev)) {
253 if (tp->t_flags & TF_OPENED_IN) {
254 error = EBUSY;
255 goto done;
256 }
257 } else {
258 if (tp->t_flags & TF_OPENED_OUT) {
259 error = EBUSY;
260 goto done;
261 }
262 }
263
264 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) {
265 error = EBUSY;
266 goto done;
267 }
268
269 if (!tty_opened(tp)) {
270 /* Set proper termios flags. */
271 if (TTY_CALLOUT(tp, dev)) {
272 tp->t_termios = tp->t_termios_init_out;
273 } else {
274 tp->t_termios = tp->t_termios_init_in;
275 }
276 ttydevsw_param(tp, &tp->t_termios);
277
278 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0);
279
280 error = ttydevsw_open(tp);
281 if (error != 0)
282 goto done;
283
284 ttydisc_open(tp);
285 tty_watermarks(tp);
286 }
287
288 /* Wait for Carrier Detect. */
289 if (!TTY_CALLOUT(tp, dev) && (oflags & O_NONBLOCK) == 0 &&
290 (tp->t_termios.c_cflag & CLOCAL) == 0) {
291 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) {
292 error = tty_wait(tp, &tp->t_dcdwait);
293 if (error != 0)
294 goto done;
295 }
296 }
297
298 if (dev == dev_console)
299 tp->t_flags |= TF_OPENED_CONS;
300 else if (TTY_CALLOUT(tp, dev))
301 tp->t_flags |= TF_OPENED_OUT;
302 else
303 tp->t_flags |= TF_OPENED_IN;
304
305 done: tp->t_flags &= ~TF_OPENCLOSE;
306 cv_broadcast(&tp->t_dcdwait);
307 ttydev_leave(tp);
308
309 return (error);
310 }
311
312 static int
313 ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
314 {
315 struct tty *tp = dev->si_drv1;
316
317 tty_lock(tp);
318
319 /*
320 * Don't actually close the device if it is being used as the
321 * console.
322 */
323 MPASS((tp->t_flags & TF_OPENED) != TF_OPENED);
324 if (dev == dev_console)
325 tp->t_flags &= ~TF_OPENED_CONS;
326 else
327 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT);
328
329 if (tp->t_flags & TF_OPENED) {
330 tty_unlock(tp);
331 return (0);
332 }
333
334 /*
335 * This can only be called once. The callin and the callout
336 * devices cannot be opened at the same time.
337 */
338 tp->t_flags &= ~(TF_EXCLUDE|TF_STOPPED);
339
340 /* Properly wake up threads that are stuck - revoke(). */
341 tp->t_revokecnt++;
342 tty_wakeup(tp, FREAD|FWRITE);
343 cv_broadcast(&tp->t_bgwait);
344 cv_broadcast(&tp->t_dcdwait);
345
346 ttydev_leave(tp);
347
348 return (0);
349 }
350
351 static __inline int
352 tty_is_ctty(struct tty *tp, struct proc *p)
353 {
354 tty_lock_assert(tp, MA_OWNED);
355
356 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT);
357 }
358
359 static int
360 tty_wait_background(struct tty *tp, struct thread *td, int sig)
361 {
362 struct proc *p = td->td_proc;
363 struct pgrp *pg;
364 ksiginfo_t ksi;
365 int error;
366
367 MPASS(sig == SIGTTIN || sig == SIGTTOU);
368 tty_lock_assert(tp, MA_OWNED);
369
370 for (;;) {
371 PROC_LOCK(p);
372 /*
373 * The process should only sleep, when:
374 * - This terminal is the controling terminal
375 * - Its process group is not the foreground process
376 * group
377 * - The parent process isn't waiting for the child to
378 * exit
379 * - the signal to send to the process isn't masked
380 */
381 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) {
382 /* Allow the action to happen. */
383 PROC_UNLOCK(p);
384 return (0);
385 }
386
387 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) ||
388 SIGISMEMBER(td->td_sigmask, sig)) {
389 /* Only allow them in write()/ioctl(). */
390 PROC_UNLOCK(p);
391 return (sig == SIGTTOU ? 0 : EIO);
392 }
393
394 pg = p->p_pgrp;
395 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) {
396 /* Don't allow the action to happen. */
397 PROC_UNLOCK(p);
398 return (EIO);
399 }
400 PROC_UNLOCK(p);
401
402 /*
403 * Send the signal and sleep until we're the new
404 * foreground process group.
405 */
406 if (sig != 0) {
407 ksiginfo_init(&ksi);
408 ksi.ksi_code = SI_KERNEL;
409 ksi.ksi_signo = sig;
410 sig = 0;
411 }
412 PGRP_LOCK(pg);
413 pgsignal(pg, ksi.ksi_signo, 1, &ksi);
414 PGRP_UNLOCK(pg);
415
416 error = tty_wait(tp, &tp->t_bgwait);
417 if (error)
418 return (error);
419 }
420 }
421
422 static int
423 ttydev_read(struct cdev *dev, struct uio *uio, int ioflag)
424 {
425 struct tty *tp = dev->si_drv1;
426 int error;
427
428 error = ttydev_enter(tp);
429 if (error)
430 goto done;
431
432 error = tty_wait_background(tp, curthread, SIGTTIN);
433 if (error) {
434 tty_unlock(tp);
435 goto done;
436 }
437
438 error = ttydisc_read(tp, uio, ioflag);
439 tty_unlock(tp);
440
441 /*
442 * The read() call should not throw an error when the device is
443 * being destroyed. Silently convert it to an EOF.
444 */
445 done: if (error == ENXIO)
446 error = 0;
447 return (error);
448 }
449
450 static int
451 ttydev_write(struct cdev *dev, struct uio *uio, int ioflag)
452 {
453 struct tty *tp = dev->si_drv1;
454 int error;
455
456 error = ttydev_enter(tp);
457 if (error)
458 return (error);
459
460 if (tp->t_termios.c_lflag & TOSTOP) {
461 error = tty_wait_background(tp, curthread, SIGTTOU);
462 if (error)
463 goto done;
464 }
465
466 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) {
467 /* Allow non-blocking writes to bypass serialization. */
468 error = ttydisc_write(tp, uio, ioflag);
469 } else {
470 /* Serialize write() calls. */
471 while (tp->t_flags & TF_BUSY_OUT) {
472 error = tty_wait(tp, &tp->t_outserwait);
473 if (error)
474 goto done;
475 }
476
477 tp->t_flags |= TF_BUSY_OUT;
478 error = ttydisc_write(tp, uio, ioflag);
479 tp->t_flags &= ~TF_BUSY_OUT;
480 cv_signal(&tp->t_outserwait);
481 }
482
483 done: tty_unlock(tp);
484 return (error);
485 }
486
487 static int
488 ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
489 struct thread *td)
490 {
491 struct tty *tp = dev->si_drv1;
492 int error;
493
494 error = ttydev_enter(tp);
495 if (error)
496 return (error);
497
498 switch (cmd) {
499 case TIOCCBRK:
500 case TIOCCONS:
501 case TIOCDRAIN:
502 case TIOCEXCL:
503 case TIOCFLUSH:
504 case TIOCNXCL:
505 case TIOCSBRK:
506 case TIOCSCTTY:
507 case TIOCSETA:
508 case TIOCSETAF:
509 case TIOCSETAW:
510 case TIOCSPGRP:
511 case TIOCSTART:
512 case TIOCSTAT:
513 case TIOCSTI:
514 case TIOCSTOP:
515 case TIOCSWINSZ:
516 #if 0
517 case TIOCSDRAINWAIT:
518 case TIOCSETD:
519 #endif
520 #ifdef COMPAT_43TTY
521 case TIOCLBIC:
522 case TIOCLBIS:
523 case TIOCLSET:
524 case TIOCSETC:
525 case OTIOCSETD:
526 case TIOCSETN:
527 case TIOCSETP:
528 case TIOCSLTC:
529 #endif /* COMPAT_43TTY */
530 /*
531 * If the ioctl() causes the TTY to be modified, let it
532 * wait in the background.
533 */
534 error = tty_wait_background(tp, curthread, SIGTTOU);
535 if (error)
536 goto done;
537 }
538
539 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) {
540 struct termios *old = &tp->t_termios;
541 struct termios *new = (struct termios *)data;
542 struct termios *lock = TTY_CALLOUT(tp, dev) ?
543 &tp->t_termios_lock_out : &tp->t_termios_lock_in;
544 int cc;
545
546 /*
547 * Lock state devices. Just overwrite the values of the
548 * commands that are currently in use.
549 */
550 new->c_iflag = (old->c_iflag & lock->c_iflag) |
551 (new->c_iflag & ~lock->c_iflag);
552 new->c_oflag = (old->c_oflag & lock->c_oflag) |
553 (new->c_oflag & ~lock->c_oflag);
554 new->c_cflag = (old->c_cflag & lock->c_cflag) |
555 (new->c_cflag & ~lock->c_cflag);
556 new->c_lflag = (old->c_lflag & lock->c_lflag) |
557 (new->c_lflag & ~lock->c_lflag);
558 for (cc = 0; cc < NCCS; ++cc)
559 if (lock->c_cc[cc])
560 new->c_cc[cc] = old->c_cc[cc];
561 if (lock->c_ispeed)
562 new->c_ispeed = old->c_ispeed;
563 if (lock->c_ospeed)
564 new->c_ospeed = old->c_ospeed;
565 }
566
567 error = tty_ioctl(tp, cmd, data, fflag, td);
568 done: tty_unlock(tp);
569
570 return (error);
571 }
572
573 static int
574 ttydev_poll(struct cdev *dev, int events, struct thread *td)
575 {
576 struct tty *tp = dev->si_drv1;
577 int error, revents = 0;
578
579 error = ttydev_enter(tp);
580 if (error)
581 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP);
582
583 if (events & (POLLIN|POLLRDNORM)) {
584 /* See if we can read something. */
585 if (ttydisc_read_poll(tp) > 0)
586 revents |= events & (POLLIN|POLLRDNORM);
587 }
588
589 if (tp->t_flags & TF_ZOMBIE) {
590 /* Hangup flag on zombie state. */
591 revents |= POLLHUP;
592 } else if (events & (POLLOUT|POLLWRNORM)) {
593 /* See if we can write something. */
594 if (ttydisc_write_poll(tp) > 0)
595 revents |= events & (POLLOUT|POLLWRNORM);
596 }
597
598 if (revents == 0) {
599 if (events & (POLLIN|POLLRDNORM))
600 selrecord(td, &tp->t_inpoll);
601 if (events & (POLLOUT|POLLWRNORM))
602 selrecord(td, &tp->t_outpoll);
603 }
604
605 tty_unlock(tp);
606
607 return (revents);
608 }
609
610 static int
611 ttydev_mmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot)
612 {
613 struct tty *tp = dev->si_drv1;
614 int error;
615
616 /* Handle mmap() through the driver. */
617
618 error = ttydev_enter(tp);
619 if (error)
620 return (-1);
621 error = ttydevsw_mmap(tp, offset, paddr, nprot);
622 tty_unlock(tp);
623
624 return (error);
625 }
626
627 /*
628 * kqueue support.
629 */
630
631 static void
632 tty_kqops_read_detach(struct knote *kn)
633 {
634 struct tty *tp = kn->kn_hook;
635
636 knlist_remove(&tp->t_inpoll.si_note, kn, 0);
637 }
638
639 static int
640 tty_kqops_read_event(struct knote *kn, long hint)
641 {
642 struct tty *tp = kn->kn_hook;
643
644 tty_lock_assert(tp, MA_OWNED);
645
646 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) {
647 kn->kn_flags |= EV_EOF;
648 return (1);
649 } else {
650 kn->kn_data = ttydisc_read_poll(tp);
651 return (kn->kn_data > 0);
652 }
653 }
654
655 static void
656 tty_kqops_write_detach(struct knote *kn)
657 {
658 struct tty *tp = kn->kn_hook;
659
660 knlist_remove(&tp->t_outpoll.si_note, kn, 0);
661 }
662
663 static int
664 tty_kqops_write_event(struct knote *kn, long hint)
665 {
666 struct tty *tp = kn->kn_hook;
667
668 tty_lock_assert(tp, MA_OWNED);
669
670 if (tty_gone(tp)) {
671 kn->kn_flags |= EV_EOF;
672 return (1);
673 } else {
674 kn->kn_data = ttydisc_write_poll(tp);
675 return (kn->kn_data > 0);
676 }
677 }
678
679 static struct filterops tty_kqops_read =
680 { 1, NULL, tty_kqops_read_detach, tty_kqops_read_event };
681 static struct filterops tty_kqops_write =
682 { 1, NULL, tty_kqops_write_detach, tty_kqops_write_event };
683
684 static int
685 ttydev_kqfilter(struct cdev *dev, struct knote *kn)
686 {
687 struct tty *tp = dev->si_drv1;
688 int error;
689
690 error = ttydev_enter(tp);
691 if (error)
692 return (error);
693
694 switch (kn->kn_filter) {
695 case EVFILT_READ:
696 kn->kn_hook = tp;
697 kn->kn_fop = &tty_kqops_read;
698 knlist_add(&tp->t_inpoll.si_note, kn, 1);
699 break;
700 case EVFILT_WRITE:
701 kn->kn_hook = tp;
702 kn->kn_fop = &tty_kqops_write;
703 knlist_add(&tp->t_outpoll.si_note, kn, 1);
704 break;
705 default:
706 error = EINVAL;
707 break;
708 }
709
710 tty_unlock(tp);
711 return (error);
712 }
713
714 static struct cdevsw ttydev_cdevsw = {
715 .d_version = D_VERSION,
716 .d_open = ttydev_open,
717 .d_close = ttydev_close,
718 .d_read = ttydev_read,
719 .d_write = ttydev_write,
720 .d_ioctl = ttydev_ioctl,
721 .d_kqfilter = ttydev_kqfilter,
722 .d_poll = ttydev_poll,
723 .d_mmap = ttydev_mmap,
724 .d_name = "ttydev",
725 .d_flags = D_TTY,
726 };
727
728 /*
729 * Init/lock-state devices
730 */
731
732 static int
733 ttyil_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
734 {
735 struct tty *tp;
736 int error = 0;
737
738 while ((tp = dev->si_drv1) == NULL) {
739 error = tsleep(&dev->si_drv1, PCATCH, "ttdrv1", 1);
740 if (error != EWOULDBLOCK)
741 return (error);
742 }
743 tty_lock(tp);
744 if (tty_gone(tp))
745 error = ENODEV;
746 tty_unlock(tp);
747
748 return (error);
749 }
750
751 static int
752 ttyil_close(struct cdev *dev, int flag, int mode, struct thread *td)
753 {
754 return (0);
755 }
756
757 static int
758 ttyil_rdwr(struct cdev *dev, struct uio *uio, int ioflag)
759 {
760 return (ENODEV);
761 }
762
763 static int
764 ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
765 struct thread *td)
766 {
767 struct tty *tp = dev->si_drv1;
768 int error = 0;
769
770 tty_lock(tp);
771 if (tty_gone(tp)) {
772 error = ENODEV;
773 goto done;
774 }
775
776 switch (cmd) {
777 case TIOCGETA:
778 /* Obtain terminal flags through tcgetattr(). */
779 *(struct termios*)data = *(struct termios*)dev->si_drv2;
780 break;
781 case TIOCSETA:
782 /* Set terminal flags through tcsetattr(). */
783 error = priv_check(td, PRIV_TTY_SETA);
784 if (error)
785 break;
786 *(struct termios*)dev->si_drv2 = *(struct termios*)data;
787 break;
788 case TIOCGETD:
789 *(int *)data = TTYDISC;
790 break;
791 case TIOCGWINSZ:
792 bzero(data, sizeof(struct winsize));
793 break;
794 default:
795 error = ENOTTY;
796 }
797
798 done: tty_unlock(tp);
799 return (error);
800 }
801
802 static struct cdevsw ttyil_cdevsw = {
803 .d_version = D_VERSION,
804 .d_open = ttyil_open,
805 .d_close = ttyil_close,
806 .d_read = ttyil_rdwr,
807 .d_write = ttyil_rdwr,
808 .d_ioctl = ttyil_ioctl,
809 .d_name = "ttyil",
810 .d_flags = D_TTY,
811 };
812
813 static void
814 tty_init_termios(struct tty *tp)
815 {
816 struct termios *t = &tp->t_termios_init_in;
817
818 t->c_cflag = TTYDEF_CFLAG;
819 t->c_iflag = TTYDEF_IFLAG;
820 t->c_lflag = TTYDEF_LFLAG;
821 t->c_oflag = TTYDEF_OFLAG;
822 t->c_ispeed = TTYDEF_SPEED;
823 t->c_ospeed = TTYDEF_SPEED;
824 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars);
825
826 tp->t_termios_init_out = *t;
827 }
828
829 void
830 tty_init_console(struct tty *tp, speed_t s)
831 {
832 struct termios *ti = &tp->t_termios_init_in;
833 struct termios *to = &tp->t_termios_init_out;
834
835 if (s != 0) {
836 ti->c_ispeed = ti->c_ospeed = s;
837 to->c_ispeed = to->c_ospeed = s;
838 }
839
840 ti->c_cflag |= CLOCAL;
841 to->c_cflag |= CLOCAL;
842 }
843
844 /*
845 * Standard device routine implementations, mostly meant for
846 * pseudo-terminal device drivers. When a driver creates a new terminal
847 * device class, missing routines are patched.
848 */
849
850 static int
851 ttydevsw_defopen(struct tty *tp)
852 {
853
854 return (0);
855 }
856
857 static void
858 ttydevsw_defclose(struct tty *tp)
859 {
860 }
861
862 static void
863 ttydevsw_defoutwakeup(struct tty *tp)
864 {
865
866 panic("Terminal device has output, while not implemented");
867 }
868
869 static void
870 ttydevsw_definwakeup(struct tty *tp)
871 {
872 }
873
874 static int
875 ttydevsw_defioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
876 {
877
878 return (ENOIOCTL);
879 }
880
881 static int
882 ttydevsw_defparam(struct tty *tp, struct termios *t)
883 {
884
885 /* Use a fake baud rate, we're not a real device. */
886 t->c_ispeed = t->c_ospeed = TTYDEF_SPEED;
887
888 return (0);
889 }
890
891 static int
892 ttydevsw_defmodem(struct tty *tp, int sigon, int sigoff)
893 {
894
895 /* Simulate a carrier to make the TTY layer happy. */
896 return (SER_DCD);
897 }
898
899 static int
900 ttydevsw_defmmap(struct tty *tp, vm_offset_t offset, vm_paddr_t *paddr,
901 int nprot)
902 {
903
904 return (-1);
905 }
906
907 static void
908 ttydevsw_defpktnotify(struct tty *tp, char event)
909 {
910 }
911
912 static void
913 ttydevsw_deffree(void *softc)
914 {
915
916 panic("Terminal device freed without a free-handler");
917 }
918
919 /*
920 * TTY allocation and deallocation. TTY devices can be deallocated when
921 * the driver doesn't use it anymore, when the TTY isn't a session's
922 * controlling TTY and when the device node isn't opened through devfs.
923 */
924
925 struct tty *
926 tty_alloc(struct ttydevsw *tsw, void *sc)
927 {
928
929 return (tty_alloc_mutex(tsw, sc, NULL));
930 }
931
932 struct tty *
933 tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex)
934 {
935 struct tty *tp;
936
937 /* Make sure the driver defines all routines. */
938 #define PATCH_FUNC(x) do { \
939 if (tsw->tsw_ ## x == NULL) \
940 tsw->tsw_ ## x = ttydevsw_def ## x; \
941 } while (0)
942 PATCH_FUNC(open);
943 PATCH_FUNC(close);
944 PATCH_FUNC(outwakeup);
945 PATCH_FUNC(inwakeup);
946 PATCH_FUNC(ioctl);
947 PATCH_FUNC(param);
948 PATCH_FUNC(modem);
949 PATCH_FUNC(mmap);
950 PATCH_FUNC(pktnotify);
951 PATCH_FUNC(free);
952 #undef PATCH_FUNC
953
954 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO);
955 tp->t_devsw = tsw;
956 tp->t_devswsoftc = sc;
957 tp->t_flags = tsw->tsw_flags;
958
959 tty_init_termios(tp);
960
961 cv_init(&tp->t_inwait, "ttyin");
962 cv_init(&tp->t_outwait, "ttyout");
963 cv_init(&tp->t_outserwait, "ttyosr");
964 cv_init(&tp->t_bgwait, "ttybg");
965 cv_init(&tp->t_dcdwait, "ttydcd");
966
967 /* Allow drivers to use a custom mutex to lock the TTY. */
968 if (mutex != NULL) {
969 tp->t_mtx = mutex;
970 } else {
971 tp->t_mtx = &tp->t_mtxobj;
972 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF);
973 }
974
975 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx);
976 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx);
977
978 sx_xlock(&tty_list_sx);
979 TAILQ_INSERT_TAIL(&tty_list, tp, t_list);
980 tty_list_count++;
981 sx_xunlock(&tty_list_sx);
982
983 return (tp);
984 }
985
986 static void
987 tty_dealloc(void *arg)
988 {
989 struct tty *tp = arg;
990
991 sx_xlock(&tty_list_sx);
992 TAILQ_REMOVE(&tty_list, tp, t_list);
993 tty_list_count--;
994 sx_xunlock(&tty_list_sx);
995
996 /* Make sure we haven't leaked buffers. */
997 MPASS(ttyinq_getsize(&tp->t_inq) == 0);
998 MPASS(ttyoutq_getsize(&tp->t_outq) == 0);
999
1000 seldrain(&tp->t_inpoll);
1001 seldrain(&tp->t_outpoll);
1002 knlist_destroy(&tp->t_inpoll.si_note);
1003 knlist_destroy(&tp->t_outpoll.si_note);
1004
1005 cv_destroy(&tp->t_inwait);
1006 cv_destroy(&tp->t_outwait);
1007 cv_destroy(&tp->t_bgwait);
1008 cv_destroy(&tp->t_dcdwait);
1009 cv_destroy(&tp->t_outserwait);
1010
1011 if (tp->t_mtx == &tp->t_mtxobj)
1012 mtx_destroy(&tp->t_mtxobj);
1013 ttydevsw_free(tp);
1014 free(tp, M_TTY);
1015 }
1016
1017 static void
1018 tty_rel_free(struct tty *tp)
1019 {
1020 struct cdev *dev;
1021
1022 tty_lock_assert(tp, MA_OWNED);
1023
1024 #define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE)
1025 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) {
1026 /* TTY is still in use. */
1027 tty_unlock(tp);
1028 return;
1029 }
1030
1031 /* TTY can be deallocated. */
1032 dev = tp->t_dev;
1033 tp->t_dev = NULL;
1034 tty_unlock(tp);
1035
1036 if (dev != NULL)
1037 destroy_dev_sched_cb(dev, tty_dealloc, tp);
1038 }
1039
1040 void
1041 tty_rel_pgrp(struct tty *tp, struct pgrp *pg)
1042 {
1043 MPASS(tp->t_sessioncnt > 0);
1044 tty_lock_assert(tp, MA_OWNED);
1045
1046 if (tp->t_pgrp == pg)
1047 tp->t_pgrp = NULL;
1048
1049 tty_unlock(tp);
1050 }
1051
1052 void
1053 tty_rel_sess(struct tty *tp, struct session *sess)
1054 {
1055 MPASS(tp->t_sessioncnt > 0);
1056
1057 /* Current session has left. */
1058 if (tp->t_session == sess) {
1059 tp->t_session = NULL;
1060 MPASS(tp->t_pgrp == NULL);
1061 }
1062 tp->t_sessioncnt--;
1063 tty_rel_free(tp);
1064 }
1065
1066 void
1067 tty_rel_gone(struct tty *tp)
1068 {
1069 MPASS(!tty_gone(tp));
1070
1071 /* Simulate carrier removal. */
1072 ttydisc_modem(tp, 0);
1073
1074 /* Wake up all blocked threads. */
1075 tty_wakeup(tp, FREAD|FWRITE);
1076 cv_broadcast(&tp->t_bgwait);
1077 cv_broadcast(&tp->t_dcdwait);
1078
1079 tp->t_flags |= TF_GONE;
1080 tty_rel_free(tp);
1081 }
1082
1083 /*
1084 * Exposing information about current TTY's through sysctl
1085 */
1086
1087 static void
1088 tty_to_xtty(struct tty *tp, struct xtty *xt)
1089 {
1090 tty_lock_assert(tp, MA_OWNED);
1091
1092 xt->xt_size = sizeof(struct xtty);
1093 xt->xt_insize = ttyinq_getsize(&tp->t_inq);
1094 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq);
1095 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq);
1096 xt->xt_inlow = tp->t_inlow;
1097 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq);
1098 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq);
1099 xt->xt_outlow = tp->t_outlow;
1100 xt->xt_column = tp->t_column;
1101 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
1102 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0;
1103 xt->xt_flags = tp->t_flags;
1104 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV;
1105 }
1106
1107 static int
1108 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
1109 {
1110 unsigned long lsize;
1111 struct xtty *xtlist, *xt;
1112 struct tty *tp;
1113 int error;
1114
1115 sx_slock(&tty_list_sx);
1116 lsize = tty_list_count * sizeof(struct xtty);
1117 if (lsize == 0) {
1118 sx_sunlock(&tty_list_sx);
1119 return (0);
1120 }
1121
1122 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK);
1123
1124 TAILQ_FOREACH(tp, &tty_list, t_list) {
1125 tty_lock(tp);
1126 tty_to_xtty(tp, xt);
1127 tty_unlock(tp);
1128 xt++;
1129 }
1130 sx_sunlock(&tty_list_sx);
1131
1132 error = SYSCTL_OUT(req, xtlist, lsize);
1133 free(xtlist, M_TTY);
1134 return (error);
1135 }
1136
1137 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
1138 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs");
1139
1140 /*
1141 * Device node creation. Device has been set up, now we can expose it to
1142 * the user.
1143 */
1144
1145 void
1146 tty_makedev(struct tty *tp, struct ucred *cred, const char *fmt, ...)
1147 {
1148 va_list ap;
1149 struct cdev *dev;
1150 const char *prefix = "tty";
1151 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */
1152 uid_t uid;
1153 gid_t gid;
1154 mode_t mode;
1155
1156 /* Remove "tty" prefix from devices like PTY's. */
1157 if (tp->t_flags & TF_NOPREFIX)
1158 prefix = "";
1159
1160 va_start(ap, fmt);
1161 vsnrprintf(name, sizeof name, 32, fmt, ap);
1162 va_end(ap);
1163
1164 if (cred == NULL) {
1165 /* System device. */
1166 uid = UID_ROOT;
1167 gid = GID_WHEEL;
1168 mode = S_IRUSR|S_IWUSR;
1169 } else {
1170 /* User device. */
1171 uid = cred->cr_ruid;
1172 gid = GID_TTY;
1173 mode = S_IRUSR|S_IWUSR|S_IWGRP;
1174 }
1175
1176 /* Master call-in device. */
1177 dev = make_dev_cred(&ttydev_cdevsw, 0, cred,
1178 uid, gid, mode, "%s%s", prefix, name);
1179 dev->si_drv1 = tp;
1180 wakeup(&dev->si_drv1);
1181 tp->t_dev = dev;
1182
1183 /* Slave call-in devices. */
1184 if (tp->t_flags & TF_INITLOCK) {
1185 dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1186 uid, gid, mode, "%s%s.init", prefix, name);
1187 dev_depends(tp->t_dev, dev);
1188 dev->si_drv1 = tp;
1189 wakeup(&dev->si_drv1);
1190 dev->si_drv2 = &tp->t_termios_init_in;
1191
1192 dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1193 uid, gid, mode, "%s%s.lock", prefix, name);
1194 dev_depends(tp->t_dev, dev);
1195 dev->si_drv1 = tp;
1196 wakeup(&dev->si_drv1);
1197 dev->si_drv2 = &tp->t_termios_lock_in;
1198 }
1199
1200 /* Call-out devices. */
1201 if (tp->t_flags & TF_CALLOUT) {
1202 dev = make_dev_cred(&ttydev_cdevsw, 0, cred,
1203 UID_UUCP, GID_DIALER, 0660, "cua%s", name);
1204 dev_depends(tp->t_dev, dev);
1205 dev->si_drv1 = tp;
1206 wakeup(&dev->si_drv1);
1207
1208 /* Slave call-out devices. */
1209 if (tp->t_flags & TF_INITLOCK) {
1210 dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1211 UID_UUCP, GID_DIALER, 0660, "cua%s.init", name);
1212 dev_depends(tp->t_dev, dev);
1213 dev->si_drv1 = tp;
1214 wakeup(&dev->si_drv1);
1215 dev->si_drv2 = &tp->t_termios_init_out;
1216
1217 dev = make_dev_cred(&ttyil_cdevsw, 0, cred,
1218 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", name);
1219 dev_depends(tp->t_dev, dev);
1220 dev->si_drv1 = tp;
1221 wakeup(&dev->si_drv1);
1222 dev->si_drv2 = &tp->t_termios_lock_out;
1223 }
1224 }
1225 }
1226
1227 /*
1228 * Signalling processes.
1229 */
1230
1231 void
1232 tty_signal_sessleader(struct tty *tp, int sig)
1233 {
1234 struct proc *p;
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 (tp->t_session != NULL && tp->t_session->s_leader != NULL) {
1243 p = tp->t_session->s_leader;
1244 PROC_LOCK(p);
1245 psignal(p, sig);
1246 PROC_UNLOCK(p);
1247 }
1248 }
1249
1250 void
1251 tty_signal_pgrp(struct tty *tp, int sig)
1252 {
1253 ksiginfo_t ksi;
1254
1255 tty_lock_assert(tp, MA_OWNED);
1256 MPASS(sig >= 1 && sig < NSIG);
1257
1258 /* Make signals start output again. */
1259 tp->t_flags &= ~TF_STOPPED;
1260
1261 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO))
1262 tty_info(tp);
1263 if (tp->t_pgrp != NULL) {
1264 ksiginfo_init(&ksi);
1265 ksi.ksi_signo = sig;
1266 ksi.ksi_code = SI_KERNEL;
1267 PGRP_LOCK(tp->t_pgrp);
1268 pgsignal(tp->t_pgrp, sig, 1, &ksi);
1269 PGRP_UNLOCK(tp->t_pgrp);
1270 }
1271 }
1272
1273 void
1274 tty_wakeup(struct tty *tp, int flags)
1275 {
1276 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL)
1277 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL));
1278
1279 if (flags & FWRITE) {
1280 cv_broadcast(&tp->t_outwait);
1281 selwakeup(&tp->t_outpoll);
1282 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0);
1283 }
1284 if (flags & FREAD) {
1285 cv_broadcast(&tp->t_inwait);
1286 selwakeup(&tp->t_inpoll);
1287 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0);
1288 }
1289 }
1290
1291 int
1292 tty_wait(struct tty *tp, struct cv *cv)
1293 {
1294 int error;
1295 int revokecnt = tp->t_revokecnt;
1296
1297 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED);
1298 MPASS(!tty_gone(tp));
1299
1300 error = cv_wait_sig(cv, tp->t_mtx);
1301
1302 /* Restart the system call when we may have been revoked. */
1303 if (tp->t_revokecnt != revokecnt)
1304 return (ERESTART);
1305
1306 /* Bail out when the device slipped away. */
1307 if (tty_gone(tp))
1308 return (ENXIO);
1309
1310 return (error);
1311 }
1312
1313 int
1314 tty_timedwait(struct tty *tp, struct cv *cv, int hz)
1315 {
1316 int error;
1317 int revokecnt = tp->t_revokecnt;
1318
1319 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED);
1320 MPASS(!tty_gone(tp));
1321
1322 error = cv_timedwait_sig(cv, tp->t_mtx, hz);
1323
1324 /* Restart the system call when we may have been revoked. */
1325 if (tp->t_revokecnt != revokecnt)
1326 return (ERESTART);
1327
1328 /* Bail out when the device slipped away. */
1329 if (tty_gone(tp))
1330 return (ENXIO);
1331
1332 return (error);
1333 }
1334
1335 void
1336 tty_flush(struct tty *tp, int flags)
1337 {
1338 if (flags & FWRITE) {
1339 tp->t_flags &= ~TF_HIWAT_OUT;
1340 ttyoutq_flush(&tp->t_outq);
1341 tty_wakeup(tp, FWRITE);
1342 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE);
1343 }
1344 if (flags & FREAD) {
1345 tty_hiwat_in_unblock(tp);
1346 ttyinq_flush(&tp->t_inq);
1347 ttydevsw_inwakeup(tp);
1348 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD);
1349 }
1350 }
1351
1352 static int
1353 tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag,
1354 struct thread *td)
1355 {
1356 int error;
1357
1358 switch (cmd) {
1359 /*
1360 * Modem commands.
1361 * The SER_* and TIOCM_* flags are the same, but one bit
1362 * shifted. I don't know why.
1363 */
1364 case TIOCSDTR:
1365 ttydevsw_modem(tp, SER_DTR, 0);
1366 return (0);
1367 case TIOCCDTR:
1368 ttydevsw_modem(tp, 0, SER_DTR);
1369 return (0);
1370 case TIOCMSET: {
1371 int bits = *(int *)data;
1372 ttydevsw_modem(tp,
1373 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1,
1374 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1);
1375 return (0);
1376 }
1377 case TIOCMBIS: {
1378 int bits = *(int *)data;
1379 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0);
1380 return (0);
1381 }
1382 case TIOCMBIC: {
1383 int bits = *(int *)data;
1384 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1);
1385 return (0);
1386 }
1387 case TIOCMGET:
1388 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1);
1389 return (0);
1390
1391 case FIOASYNC:
1392 if (*(int *)data)
1393 tp->t_flags |= TF_ASYNC;
1394 else
1395 tp->t_flags &= ~TF_ASYNC;
1396 return (0);
1397 case FIONBIO:
1398 /* This device supports non-blocking operation. */
1399 return (0);
1400 case FIONREAD:
1401 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq);
1402 return (0);
1403 case FIONWRITE:
1404 case TIOCOUTQ:
1405 *(int *)data = ttyoutq_bytesused(&tp->t_outq);
1406 return (0);
1407 case FIOSETOWN:
1408 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc))
1409 /* Not allowed to set ownership. */
1410 return (ENOTTY);
1411
1412 /* Temporarily unlock the TTY to set ownership. */
1413 tty_unlock(tp);
1414 error = fsetown(*(int *)data, &tp->t_sigio);
1415 tty_lock(tp);
1416 return (error);
1417 case FIOGETOWN:
1418 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc))
1419 /* Not allowed to set ownership. */
1420 return (ENOTTY);
1421
1422 /* Get ownership. */
1423 *(int *)data = fgetown(&tp->t_sigio);
1424 return (0);
1425 case TIOCGETA:
1426 /* Obtain terminal flags through tcgetattr(). */
1427 *(struct termios*)data = tp->t_termios;
1428 return (0);
1429 case TIOCSETA:
1430 case TIOCSETAW:
1431 case TIOCSETAF: {
1432 struct termios *t = data;
1433
1434 /*
1435 * Who makes up these funny rules? According to POSIX,
1436 * input baud rate is set equal to the output baud rate
1437 * when zero.
1438 */
1439 if (t->c_ispeed == 0)
1440 t->c_ispeed = t->c_ospeed;
1441
1442 /* Discard any unsupported bits. */
1443 t->c_iflag &= TTYSUP_IFLAG;
1444 t->c_oflag &= TTYSUP_OFLAG;
1445 t->c_lflag &= TTYSUP_LFLAG;
1446 t->c_cflag &= TTYSUP_CFLAG;
1447
1448 /* Set terminal flags through tcsetattr(). */
1449 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
1450 error = tty_drain(tp);
1451 if (error)
1452 return (error);
1453 if (cmd == TIOCSETAF)
1454 tty_flush(tp, FREAD);
1455 }
1456
1457 /*
1458 * Only call param() when the flags really change.
1459 */
1460 if ((t->c_cflag & CIGNORE) == 0 &&
1461 (tp->t_termios.c_cflag != t->c_cflag ||
1462 tp->t_termios.c_ispeed != t->c_ispeed ||
1463 tp->t_termios.c_ospeed != t->c_ospeed)) {
1464 error = ttydevsw_param(tp, t);
1465 if (error)
1466 return (error);
1467
1468 /* XXX: CLOCAL? */
1469
1470 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE;
1471 tp->t_termios.c_ispeed = t->c_ispeed;
1472 tp->t_termios.c_ospeed = t->c_ospeed;
1473
1474 /* Baud rate has changed - update watermarks. */
1475 tty_watermarks(tp);
1476 }
1477
1478 /* Copy new non-device driver parameters. */
1479 tp->t_termios.c_iflag = t->c_iflag;
1480 tp->t_termios.c_oflag = t->c_oflag;
1481 tp->t_termios.c_lflag = t->c_lflag;
1482 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc);
1483
1484 ttydisc_optimize(tp);
1485
1486 if ((t->c_lflag & ICANON) == 0) {
1487 /*
1488 * When in non-canonical mode, wake up all
1489 * readers. Canonicalize any partial input. VMIN
1490 * and VTIME could also be adjusted.
1491 */
1492 ttyinq_canonicalize(&tp->t_inq);
1493 tty_wakeup(tp, FREAD);
1494 }
1495
1496 /*
1497 * For packet mode: notify the PTY consumer that VSTOP
1498 * and VSTART may have been changed.
1499 */
1500 if (tp->t_termios.c_iflag & IXON &&
1501 tp->t_termios.c_cc[VSTOP] == CTRL('S') &&
1502 tp->t_termios.c_cc[VSTART] == CTRL('Q'))
1503 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP);
1504 else
1505 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP);
1506 return (0);
1507 }
1508 case TIOCGETD:
1509 /* For compatibility - we only support TTYDISC. */
1510 *(int *)data = TTYDISC;
1511 return (0);
1512 case TIOCGPGRP:
1513 if (!tty_is_ctty(tp, td->td_proc))
1514 return (ENOTTY);
1515
1516 if (tp->t_pgrp != NULL)
1517 *(int *)data = tp->t_pgrp->pg_id;
1518 else
1519 *(int *)data = NO_PID;
1520 return (0);
1521 case TIOCGSID:
1522 if (!tty_is_ctty(tp, td->td_proc))
1523 return (ENOTTY);
1524
1525 MPASS(tp->t_session);
1526 *(int *)data = tp->t_session->s_sid;
1527 return (0);
1528 case TIOCSCTTY: {
1529 struct proc *p = td->td_proc;
1530
1531 /* XXX: This looks awful. */
1532 tty_unlock(tp);
1533 sx_xlock(&proctree_lock);
1534 tty_lock(tp);
1535
1536 if (!SESS_LEADER(p)) {
1537 /* Only the session leader may do this. */
1538 sx_xunlock(&proctree_lock);
1539 return (EPERM);
1540 }
1541
1542 if (tp->t_session != NULL && tp->t_session == p->p_session) {
1543 /* This is already our controlling TTY. */
1544 sx_xunlock(&proctree_lock);
1545 return (0);
1546 }
1547
1548 if (p->p_session->s_ttyp != NULL ||
1549 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL &&
1550 tp->t_session->s_ttyvp->v_type != VBAD)) {
1551 /*
1552 * There is already a relation between a TTY and
1553 * a session, or the caller is not the session
1554 * leader.
1555 *
1556 * Allow the TTY to be stolen when the vnode is
1557 * invalid, but the reference to the TTY is
1558 * still active. This allows immediate reuse of
1559 * TTYs of which the session leader has been
1560 * killed or the TTY revoked.
1561 */
1562 sx_xunlock(&proctree_lock);
1563 return (EPERM);
1564 }
1565
1566 /* Connect the session to the TTY. */
1567 tp->t_session = p->p_session;
1568 tp->t_session->s_ttyp = tp;
1569 tp->t_sessioncnt++;
1570 sx_xunlock(&proctree_lock);
1571
1572 /* Assign foreground process group. */
1573 tp->t_pgrp = p->p_pgrp;
1574 PROC_LOCK(p);
1575 p->p_flag |= P_CONTROLT;
1576 PROC_UNLOCK(p);
1577
1578 return (0);
1579 }
1580 case TIOCSPGRP: {
1581 struct pgrp *pg;
1582
1583 /*
1584 * XXX: Temporarily unlock the TTY to locate the process
1585 * group. This code would be lot nicer if we would ever
1586 * decompose proctree_lock.
1587 */
1588 tty_unlock(tp);
1589 sx_slock(&proctree_lock);
1590 pg = pgfind(*(int *)data);
1591 if (pg != NULL)
1592 PGRP_UNLOCK(pg);
1593 if (pg == NULL || pg->pg_session != td->td_proc->p_session) {
1594 sx_sunlock(&proctree_lock);
1595 tty_lock(tp);
1596 return (EPERM);
1597 }
1598 tty_lock(tp);
1599
1600 /*
1601 * Determine if this TTY is the controlling TTY after
1602 * relocking the TTY.
1603 */
1604 if (!tty_is_ctty(tp, td->td_proc)) {
1605 sx_sunlock(&proctree_lock);
1606 return (ENOTTY);
1607 }
1608 tp->t_pgrp = pg;
1609 sx_sunlock(&proctree_lock);
1610
1611 /* Wake up the background process groups. */
1612 cv_broadcast(&tp->t_bgwait);
1613 return (0);
1614 }
1615 case TIOCFLUSH: {
1616 int flags = *(int *)data;
1617
1618 if (flags == 0)
1619 flags = (FREAD|FWRITE);
1620 else
1621 flags &= (FREAD|FWRITE);
1622 tty_flush(tp, flags);
1623 return (0);
1624 }
1625 case TIOCDRAIN:
1626 /* Drain TTY output. */
1627 return tty_drain(tp);
1628 case TIOCCONS:
1629 /* Set terminal as console TTY. */
1630 if (*(int *)data) {
1631 error = priv_check(td, PRIV_TTY_CONSOLE);
1632 if (error)
1633 return (error);
1634
1635 /*
1636 * XXX: constty should really need to be locked!
1637 * XXX: allow disconnected constty's to be stolen!
1638 */
1639
1640 if (constty == tp)
1641 return (0);
1642 if (constty != NULL)
1643 return (EBUSY);
1644
1645 tty_unlock(tp);
1646 constty_set(tp);
1647 tty_lock(tp);
1648 } else if (constty == tp) {
1649 constty_clear();
1650 }
1651 return (0);
1652 case TIOCGWINSZ:
1653 /* Obtain window size. */
1654 *(struct winsize*)data = tp->t_winsize;
1655 return (0);
1656 case TIOCSWINSZ:
1657 /* Set window size. */
1658 if (bcmp(&tp->t_winsize, data, sizeof(struct winsize)) == 0)
1659 return (0);
1660 tp->t_winsize = *(struct winsize*)data;
1661 tty_signal_pgrp(tp, SIGWINCH);
1662 return (0);
1663 case TIOCEXCL:
1664 tp->t_flags |= TF_EXCLUDE;
1665 return (0);
1666 case TIOCNXCL:
1667 tp->t_flags &= ~TF_EXCLUDE;
1668 return (0);
1669 case TIOCSTOP:
1670 tp->t_flags |= TF_STOPPED;
1671 ttydevsw_pktnotify(tp, TIOCPKT_STOP);
1672 return (0);
1673 case TIOCSTART:
1674 tp->t_flags &= ~TF_STOPPED;
1675 ttydevsw_outwakeup(tp);
1676 ttydevsw_pktnotify(tp, TIOCPKT_START);
1677 return (0);
1678 case TIOCSTAT:
1679 tty_info(tp);
1680 return (0);
1681 case TIOCSTI:
1682 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI))
1683 return (EPERM);
1684 if (!tty_is_ctty(tp, td->td_proc) &&
1685 priv_check(td, PRIV_TTY_STI))
1686 return (EACCES);
1687 ttydisc_rint(tp, *(char *)data, 0);
1688 ttydisc_rint_done(tp);
1689 return (0);
1690 }
1691
1692 #ifdef COMPAT_43TTY
1693 return tty_ioctl_compat(tp, cmd, data, fflag, td);
1694 #else /* !COMPAT_43TTY */
1695 return (ENOIOCTL);
1696 #endif /* COMPAT_43TTY */
1697 }
1698
1699 int
1700 tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td)
1701 {
1702 int error;
1703
1704 tty_lock_assert(tp, MA_OWNED);
1705
1706 if (tty_gone(tp))
1707 return (ENXIO);
1708
1709 error = ttydevsw_ioctl(tp, cmd, data, td);
1710 if (error == ENOIOCTL)
1711 error = tty_generic_ioctl(tp, cmd, data, fflag, td);
1712
1713 return (error);
1714 }
1715
1716 dev_t
1717 tty_udev(struct tty *tp)
1718 {
1719 if (tp->t_dev)
1720 return dev2udev(tp->t_dev);
1721 else
1722 return NODEV;
1723 }
1724
1725 int
1726 tty_checkoutq(struct tty *tp)
1727 {
1728
1729 /* 256 bytes should be enough to print a log message. */
1730 return (ttyoutq_bytesleft(&tp->t_outq) >= 256);
1731 }
1732
1733 void
1734 tty_hiwat_in_block(struct tty *tp)
1735 {
1736
1737 if ((tp->t_flags & TF_HIWAT_IN) == 0 &&
1738 tp->t_termios.c_iflag & IXOFF &&
1739 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) {
1740 /*
1741 * Input flow control. Only enter the high watermark when we
1742 * can successfully store the VSTOP character.
1743 */
1744 if (ttyoutq_write_nofrag(&tp->t_outq,
1745 &tp->t_termios.c_cc[VSTOP], 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
1753 void
1754 tty_hiwat_in_unblock(struct tty *tp)
1755 {
1756
1757 if (tp->t_flags & TF_HIWAT_IN &&
1758 tp->t_termios.c_iflag & IXOFF &&
1759 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) {
1760 /*
1761 * Input flow control. Only leave the high watermark when we
1762 * can successfully store the VSTART character.
1763 */
1764 if (ttyoutq_write_nofrag(&tp->t_outq,
1765 &tp->t_termios.c_cc[VSTART], 1) == 0)
1766 tp->t_flags &= ~TF_HIWAT_IN;
1767 } else {
1768 /* No input flow control. */
1769 tp->t_flags &= ~TF_HIWAT_IN;
1770 }
1771
1772 if (!tty_gone(tp))
1773 ttydevsw_inwakeup(tp);
1774 }
1775
1776 /*
1777 * TTY hooks interface.
1778 */
1779
1780 static int
1781 ttyhook_defrint(struct tty *tp, char c, int flags)
1782 {
1783
1784 if (ttyhook_rint_bypass(tp, &c, 1) != 1)
1785 return (-1);
1786
1787 return (0);
1788 }
1789
1790 int
1791 ttyhook_register(struct tty **rtp, struct proc *p, int fd,
1792 struct ttyhook *th, void *softc)
1793 {
1794 struct tty *tp;
1795 struct file *fp;
1796 struct cdev *dev;
1797 struct cdevsw *cdp;
1798 struct filedesc *fdp;
1799 int error, ref;
1800
1801 /* Validate the file descriptor. */
1802 if ((fdp = p->p_fd) == NULL)
1803 return (EBADF);
1804
1805 fp = fget_unlocked(fdp, fd);
1806 if (fp == NULL)
1807 return (EBADF);
1808 if (fp->f_ops == &badfileops) {
1809 error = EBADF;
1810 goto done1;
1811 }
1812
1813 /*
1814 * Make sure the vnode is bound to a character device.
1815 * Unlocked check for the vnode type is ok there, because we
1816 * only shall prevent calling devvn_refthread on the file that
1817 * never has been opened over a character device.
1818 */
1819 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) {
1820 error = EINVAL;
1821 goto done1;
1822 }
1823
1824 /* Make sure it is a TTY. */
1825 cdp = devvn_refthread(fp->f_vnode, &dev, &ref);
1826 if (cdp == NULL) {
1827 error = ENXIO;
1828 goto done1;
1829 }
1830 if (dev != fp->f_data) {
1831 error = ENXIO;
1832 goto done2;
1833 }
1834 if (cdp != &ttydev_cdevsw) {
1835 error = ENOTTY;
1836 goto done2;
1837 }
1838 tp = dev->si_drv1;
1839
1840 /* Try to attach the hook to the TTY. */
1841 error = EBUSY;
1842 tty_lock(tp);
1843 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0));
1844 if (tp->t_flags & TF_HOOK)
1845 goto done3;
1846
1847 tp->t_flags |= TF_HOOK;
1848 tp->t_hook = th;
1849 tp->t_hooksoftc = softc;
1850 *rtp = tp;
1851 error = 0;
1852
1853 /* Maybe we can switch into bypass mode now. */
1854 ttydisc_optimize(tp);
1855
1856 /* Silently convert rint() calls to rint_bypass() when possible. */
1857 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass))
1858 th->th_rint = ttyhook_defrint;
1859
1860 done3: tty_unlock(tp);
1861 done2: dev_relthread(dev, ref);
1862 done1: fdrop(fp, curthread);
1863 return (error);
1864 }
1865
1866 void
1867 ttyhook_unregister(struct tty *tp)
1868 {
1869
1870 tty_lock_assert(tp, MA_OWNED);
1871 MPASS(tp->t_flags & TF_HOOK);
1872
1873 /* Disconnect the hook. */
1874 tp->t_flags &= ~TF_HOOK;
1875 tp->t_hook = NULL;
1876
1877 /* Maybe we need to leave bypass mode. */
1878 ttydisc_optimize(tp);
1879
1880 /* Maybe deallocate the TTY as well. */
1881 tty_rel_free(tp);
1882 }
1883
1884 /*
1885 * /dev/console handling.
1886 */
1887
1888 static int
1889 ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
1890 {
1891 struct tty *tp;
1892
1893 /* System has no console device. */
1894 if (dev_console_filename == NULL)
1895 return (ENXIO);
1896
1897 /* Look up corresponding TTY by device name. */
1898 sx_slock(&tty_list_sx);
1899 TAILQ_FOREACH(tp, &tty_list, t_list) {
1900 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) {
1901 dev_console->si_drv1 = tp;
1902 break;
1903 }
1904 }
1905 sx_sunlock(&tty_list_sx);
1906
1907 /* System console has no TTY associated. */
1908 if (dev_console->si_drv1 == NULL)
1909 return (ENXIO);
1910
1911 return (ttydev_open(dev, oflags, devtype, td));
1912 }
1913
1914 static int
1915 ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag)
1916 {
1917
1918 log_console(uio);
1919
1920 return (ttydev_write(dev, uio, ioflag));
1921 }
1922
1923 /*
1924 * /dev/console is a little different than normal TTY's. When opened,
1925 * it determines which TTY to use. When data gets written to it, it
1926 * will be logged in the kernel message buffer.
1927 */
1928 static struct cdevsw ttyconsdev_cdevsw = {
1929 .d_version = D_VERSION,
1930 .d_open = ttyconsdev_open,
1931 .d_close = ttydev_close,
1932 .d_read = ttydev_read,
1933 .d_write = ttyconsdev_write,
1934 .d_ioctl = ttydev_ioctl,
1935 .d_kqfilter = ttydev_kqfilter,
1936 .d_poll = ttydev_poll,
1937 .d_mmap = ttydev_mmap,
1938 .d_name = "ttyconsdev",
1939 .d_flags = D_TTY,
1940 };
1941
1942 static void
1943 ttyconsdev_init(void *unused)
1944 {
1945
1946 dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0,
1947 NULL, UID_ROOT, GID_WHEEL, 0600, "console");
1948 }
1949
1950 SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL);
1951
1952 void
1953 ttyconsdev_select(const char *name)
1954 {
1955
1956 dev_console_filename = name;
1957 }
1958
1959 /*
1960 * Debugging routines.
1961 */
1962
1963 #include "opt_ddb.h"
1964 #ifdef DDB
1965 #include <ddb/ddb.h>
1966 #include <ddb/db_sym.h>
1967
1968 static struct {
1969 int flag;
1970 char val;
1971 } ttystates[] = {
1972 #if 0
1973 { TF_NOPREFIX, 'N' },
1974 #endif
1975 { TF_INITLOCK, 'I' },
1976 { TF_CALLOUT, 'C' },
1977
1978 /* Keep these together -> 'Oi' and 'Oo'. */
1979 { TF_OPENED, 'O' },
1980 { TF_OPENED_IN, 'i' },
1981 { TF_OPENED_OUT, 'o' },
1982 { TF_OPENED_CONS, 'c' },
1983
1984 { TF_GONE, 'G' },
1985 { TF_OPENCLOSE, 'B' },
1986 { TF_ASYNC, 'Y' },
1987 { TF_LITERAL, 'L' },
1988
1989 /* Keep these together -> 'Hi' and 'Ho'. */
1990 { TF_HIWAT, 'H' },
1991 { TF_HIWAT_IN, 'i' },
1992 { TF_HIWAT_OUT, 'o' },
1993
1994 { TF_STOPPED, 'S' },
1995 { TF_EXCLUDE, 'X' },
1996 { TF_BYPASS, 'l' },
1997 { TF_ZOMBIE, 'Z' },
1998 { TF_HOOK, 's' },
1999
2000 /* Keep these together -> 'bi' and 'bo'. */
2001 { TF_BUSY, 'b' },
2002 { TF_BUSY_IN, 'i' },
2003 { TF_BUSY_OUT, 'o' },
2004
2005 { 0, '\0'},
2006 };
2007
2008 #define TTY_FLAG_BITS \
2009 "\2\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN\5OPENED_OUT\6GONE" \
2010 "\7OPENCLOSE\10ASYNC\11LITERAL\12HIWAT_IN\13HIWAT_OUT\14STOPPED" \
2011 "\15EXCLUDE\16BYPASS\17ZOMBIE\20HOOK"
2012
2013 #define DB_PRINTSYM(name, addr) \
2014 db_printf("%s " #name ": ", sep); \
2015 db_printsym((db_addr_t) addr, DB_STGY_ANY); \
2016 db_printf("\n");
2017
2018 static void
2019 _db_show_devsw(const char *sep, const struct ttydevsw *tsw)
2020 {
2021 db_printf("%sdevsw: ", sep);
2022 db_printsym((db_addr_t)tsw, DB_STGY_ANY);
2023 db_printf(" (%p)\n", tsw);
2024 DB_PRINTSYM(open, tsw->tsw_open);
2025 DB_PRINTSYM(close, tsw->tsw_close);
2026 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup);
2027 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup);
2028 DB_PRINTSYM(ioctl, tsw->tsw_ioctl);
2029 DB_PRINTSYM(param, tsw->tsw_param);
2030 DB_PRINTSYM(modem, tsw->tsw_modem);
2031 DB_PRINTSYM(mmap, tsw->tsw_mmap);
2032 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify);
2033 DB_PRINTSYM(free, tsw->tsw_free);
2034 }
2035 static void
2036 _db_show_hooks(const char *sep, const struct ttyhook *th)
2037 {
2038 db_printf("%shook: ", sep);
2039 db_printsym((db_addr_t)th, DB_STGY_ANY);
2040 db_printf(" (%p)\n", th);
2041 if (th == NULL)
2042 return;
2043 DB_PRINTSYM(rint, th->th_rint);
2044 DB_PRINTSYM(rint_bypass, th->th_rint_bypass);
2045 DB_PRINTSYM(rint_done, th->th_rint_done);
2046 DB_PRINTSYM(rint_poll, th->th_rint_poll);
2047 DB_PRINTSYM(getc_inject, th->th_getc_inject);
2048 DB_PRINTSYM(getc_capture, th->th_getc_capture);
2049 DB_PRINTSYM(getc_poll, th->th_getc_poll);
2050 DB_PRINTSYM(close, th->th_close);
2051 }
2052
2053 static void
2054 _db_show_termios(const char *name, const struct termios *t)
2055 {
2056
2057 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x "
2058 "lflag 0x%x ispeed %u ospeed %u\n", name,
2059 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag,
2060 t->c_ispeed, t->c_ospeed);
2061 }
2062
2063 /* DDB command to show TTY statistics. */
2064 DB_SHOW_COMMAND(tty, db_show_tty)
2065 {
2066 struct tty *tp;
2067
2068 if (!have_addr) {
2069 db_printf("usage: show tty <addr>\n");
2070 return;
2071 }
2072 tp = (struct tty *)addr;
2073
2074 db_printf("0x%p: %s\n", tp, tty_devname(tp));
2075 db_printf("\tmtx: %p\n", tp->t_mtx);
2076 db_printf("\tflags: %b\n", tp->t_flags, TTY_FLAG_BITS);
2077 db_printf("\trevokecnt: %u\n", tp->t_revokecnt);
2078
2079 /* Buffering mechanisms. */
2080 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u "
2081 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin,
2082 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end,
2083 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota);
2084 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n",
2085 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end,
2086 tp->t_outq.to_nblocks, tp->t_outq.to_quota);
2087 db_printf("\tinlow: %zu\n", tp->t_inlow);
2088 db_printf("\toutlow: %zu\n", tp->t_outlow);
2089 _db_show_termios("\ttermios", &tp->t_termios);
2090 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n",
2091 tp->t_winsize.ws_row, tp->t_winsize.ws_col,
2092 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel);
2093 db_printf("\tcolumn: %u\n", tp->t_column);
2094 db_printf("\twritepos: %u\n", tp->t_writepos);
2095 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags);
2096
2097 /* Init/lock-state devices. */
2098 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in);
2099 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out);
2100 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in);
2101 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out);
2102
2103 /* Hooks */
2104 _db_show_devsw("\t", tp->t_devsw);
2105 _db_show_hooks("\t", tp->t_hook);
2106
2107 /* Process info. */
2108 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp,
2109 tp->t_pgrp ? tp->t_pgrp->pg_id : 0,
2110 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0);
2111 db_printf("\tsession: %p", tp->t_session);
2112 if (tp->t_session != NULL)
2113 db_printf(" count %u leader %p tty %p sid %d login %s",
2114 tp->t_session->s_count, tp->t_session->s_leader,
2115 tp->t_session->s_ttyp, tp->t_session->s_sid,
2116 tp->t_session->s_login);
2117 db_printf("\n");
2118 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt);
2119 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc);
2120 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc);
2121 db_printf("\tdev: %p\n", tp->t_dev);
2122 }
2123
2124 /* DDB command to list TTYs. */
2125 DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys)
2126 {
2127 struct tty *tp;
2128 size_t isiz, osiz;
2129 int i, j;
2130
2131 /* Make the output look like `pstat -t'. */
2132 db_printf("PTR ");
2133 #if defined(__LP64__)
2134 db_printf(" ");
2135 #endif
2136 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW "
2137 "COL SESS PGID STATE\n");
2138
2139 TAILQ_FOREACH(tp, &tty_list, t_list) {
2140 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE;
2141 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE;
2142
2143 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d %5d ",
2144 tp,
2145 tty_devname(tp),
2146 isiz,
2147 tp->t_inq.ti_linestart - tp->t_inq.ti_begin,
2148 tp->t_inq.ti_end - tp->t_inq.ti_linestart,
2149 isiz - tp->t_inlow,
2150 osiz,
2151 tp->t_outq.to_end - tp->t_outq.to_begin,
2152 osiz - tp->t_outlow,
2153 MIN(tp->t_column, 99999),
2154 tp->t_session ? tp->t_session->s_sid : 0,
2155 tp->t_pgrp ? tp->t_pgrp->pg_id : 0);
2156
2157 /* Flag bits. */
2158 for (i = j = 0; ttystates[i].flag; i++)
2159 if (tp->t_flags & ttystates[i].flag) {
2160 db_printf("%c", ttystates[i].val);
2161 j++;
2162 }
2163 if (j == 0)
2164 db_printf("-");
2165 db_printf("\n");
2166 }
2167 }
2168 #endif /* DDB */
Cache object: 0ff4ba77ade6df143806f8b4d28a63ff
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