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/11.1/sys/kern/tty.c 314538 2017-03-02 04:23:53Z ian $");
32
33 #include "opt_capsicum.h"
34 #include "opt_compat.h"
35
36 #include <sys/param.h>
37 #include <sys/capsicum.h>
38 #include <sys/conf.h>
39 #include <sys/cons.h>
40 #include <sys/fcntl.h>
41 #include <sys/file.h>
42 #include <sys/filedesc.h>
43 #include <sys/filio.h>
44 #ifdef COMPAT_43TTY
45 #include <sys/ioctl_compat.h>
46 #endif /* COMPAT_43TTY */
47 #include <sys/kernel.h>
48 #include <sys/limits.h>
49 #include <sys/malloc.h>
50 #include <sys/mount.h>
51 #include <sys/poll.h>
52 #include <sys/priv.h>
53 #include <sys/proc.h>
54 #include <sys/serial.h>
55 #include <sys/signal.h>
56 #include <sys/stat.h>
57 #include <sys/sx.h>
58 #include <sys/sysctl.h>
59 #include <sys/systm.h>
60 #include <sys/tty.h>
61 #include <sys/ttycom.h>
62 #define TTYDEFCHARS
63 #include <sys/ttydefaults.h>
64 #undef TTYDEFCHARS
65 #include <sys/ucred.h>
66 #include <sys/vnode.h>
67
68 #include <machine/stdarg.h>
69
70 static MALLOC_DEFINE(M_TTY, "tty", "tty device");
71
72 static void tty_rel_free(struct tty *tp);
73
74 static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list);
75 static struct sx tty_list_sx;
76 SX_SYSINIT(tty_list, &tty_list_sx, "tty list");
77 static unsigned int tty_list_count = 0;
78
79 /* Character device of /dev/console. */
80 static struct cdev *dev_console;
81 static const char *dev_console_filename;
82
83 /*
84 * Flags that are supported and stored by this implementation.
85 */
86 #define TTYSUP_IFLAG (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|ISTRIP|\
87 INLCR|IGNCR|ICRNL|IXON|IXOFF|IXANY|IMAXBEL)
88 #define TTYSUP_OFLAG (OPOST|ONLCR|TAB3|ONOEOT|OCRNL|ONOCR|ONLRET)
89 #define TTYSUP_LFLAG (ECHOKE|ECHOE|ECHOK|ECHO|ECHONL|ECHOPRT|\
90 ECHOCTL|ISIG|ICANON|ALTWERASE|IEXTEN|TOSTOP|\
91 FLUSHO|NOKERNINFO|NOFLSH)
92 #define TTYSUP_CFLAG (CIGNORE|CSIZE|CSTOPB|CREAD|PARENB|PARODD|\
93 HUPCL|CLOCAL|CCTS_OFLOW|CRTS_IFLOW|CDTR_IFLOW|\
94 CDSR_OFLOW|CCAR_OFLOW)
95
96 #define TTY_CALLOUT(tp,d) (dev2unit(d) & TTYUNIT_CALLOUT)
97
98 static int tty_drainwait = 5 * 60;
99 SYSCTL_INT(_kern, OID_AUTO, tty_drainwait, CTLFLAG_RWTUN,
100 &tty_drainwait, 0, "Default output drain timeout in seconds");
101
102 /*
103 * Set TTY buffer sizes.
104 */
105
106 #define TTYBUF_MAX 65536
107
108 /*
109 * Allocate buffer space if necessary, and set low watermarks, based on speed.
110 * Note that the ttyxxxq_setsize() functions may drop and then reacquire the tty
111 * lock during memory allocation. They will return ENXIO if the tty disappears
112 * while unlocked.
113 */
114 static int
115 tty_watermarks(struct tty *tp)
116 {
117 size_t bs = 0;
118 int error;
119
120 /* Provide an input buffer for 2 seconds of data. */
121 if (tp->t_termios.c_cflag & CREAD)
122 bs = MIN(tp->t_termios.c_ispeed / 5, TTYBUF_MAX);
123 error = ttyinq_setsize(&tp->t_inq, tp, bs);
124 if (error != 0)
125 return (error);
126
127 /* Set low watermark at 10% (when 90% is available). */
128 tp->t_inlow = (ttyinq_getallocatedsize(&tp->t_inq) * 9) / 10;
129
130 /* Provide an output buffer for 2 seconds of data. */
131 bs = MIN(tp->t_termios.c_ospeed / 5, TTYBUF_MAX);
132 error = ttyoutq_setsize(&tp->t_outq, tp, bs);
133 if (error != 0)
134 return (error);
135
136 /* Set low watermark at 10% (when 90% is available). */
137 tp->t_outlow = (ttyoutq_getallocatedsize(&tp->t_outq) * 9) / 10;
138
139 return (0);
140 }
141
142 static int
143 tty_drain(struct tty *tp, int leaving)
144 {
145 sbintime_t timeout_at;
146 size_t bytes;
147 int error;
148
149 if (ttyhook_hashook(tp, getc_inject))
150 /* buffer is inaccessible */
151 return (0);
152
153 /*
154 * For close(), use the recent historic timeout of "1 second without
155 * making progress". For tcdrain(), use t_drainwait as the timeout,
156 * with zero meaning "no timeout" which gives POSIX behavior.
157 */
158 if (leaving)
159 timeout_at = getsbinuptime() + SBT_1S;
160 else if (tp->t_drainwait != 0)
161 timeout_at = getsbinuptime() + SBT_1S * tp->t_drainwait;
162 else
163 timeout_at = 0;
164
165 /*
166 * Poll the output buffer and the hardware for completion, at 10 Hz.
167 * Polling is required for devices which are not able to signal an
168 * interrupt when the transmitter becomes idle (most USB serial devs).
169 * The unusual structure of this loop ensures we check for busy one more
170 * time after tty_timedwait() returns EWOULDBLOCK, so that success has
171 * higher priority than timeout if the IO completed in the last 100mS.
172 */
173 error = 0;
174 bytes = ttyoutq_bytesused(&tp->t_outq);
175 for (;;) {
176 if (ttyoutq_bytesused(&tp->t_outq) == 0 && !ttydevsw_busy(tp))
177 return (0);
178 if (error != 0)
179 return (error);
180 ttydevsw_outwakeup(tp);
181 error = tty_timedwait(tp, &tp->t_outwait, hz / 10);
182 if (error != 0 && error != EWOULDBLOCK)
183 return (error);
184 else if (timeout_at == 0 || getsbinuptime() < timeout_at)
185 error = 0;
186 else if (leaving && ttyoutq_bytesused(&tp->t_outq) < bytes) {
187 /* In close, making progress, grant an extra second. */
188 error = 0;
189 timeout_at += SBT_1S;
190 bytes = ttyoutq_bytesused(&tp->t_outq);
191 }
192 }
193 }
194
195 /*
196 * Though ttydev_enter() and ttydev_leave() seem to be related, they
197 * don't have to be used together. ttydev_enter() is used by the cdev
198 * operations to prevent an actual operation from being processed when
199 * the TTY has been abandoned. ttydev_leave() is used by ttydev_open()
200 * and ttydev_close() to determine whether per-TTY data should be
201 * deallocated.
202 */
203
204 static __inline int
205 ttydev_enter(struct tty *tp)
206 {
207
208 tty_lock(tp);
209
210 if (tty_gone(tp) || !tty_opened(tp)) {
211 /* Device is already gone. */
212 tty_unlock(tp);
213 return (ENXIO);
214 }
215
216 return (0);
217 }
218
219 static void
220 ttydev_leave(struct tty *tp)
221 {
222
223 tty_lock_assert(tp, MA_OWNED);
224
225 if (tty_opened(tp) || tp->t_flags & TF_OPENCLOSE) {
226 /* Device is still opened somewhere. */
227 tty_unlock(tp);
228 return;
229 }
230
231 tp->t_flags |= TF_OPENCLOSE;
232
233 /* Stop asynchronous I/O. */
234 funsetown(&tp->t_sigio);
235
236 /* Remove console TTY. */
237 if (constty == tp)
238 constty_clear();
239
240 /* Drain any output. */
241 if (!tty_gone(tp))
242 tty_drain(tp, 1);
243
244 ttydisc_close(tp);
245
246 /* Free i/o queues now since they might be large. */
247 ttyinq_free(&tp->t_inq);
248 tp->t_inlow = 0;
249 ttyoutq_free(&tp->t_outq);
250 tp->t_outlow = 0;
251
252 knlist_clear(&tp->t_inpoll.si_note, 1);
253 knlist_clear(&tp->t_outpoll.si_note, 1);
254
255 if (!tty_gone(tp))
256 ttydevsw_close(tp);
257
258 tp->t_flags &= ~TF_OPENCLOSE;
259 cv_broadcast(&tp->t_dcdwait);
260 tty_rel_free(tp);
261 }
262
263 /*
264 * Operations that are exposed through the character device in /dev.
265 */
266 static int
267 ttydev_open(struct cdev *dev, int oflags, int devtype __unused,
268 struct thread *td)
269 {
270 struct tty *tp;
271 int error;
272
273 tp = dev->si_drv1;
274 error = 0;
275 tty_lock(tp);
276 if (tty_gone(tp)) {
277 /* Device is already gone. */
278 tty_unlock(tp);
279 return (ENXIO);
280 }
281
282 /*
283 * Block when other processes are currently opening or closing
284 * the TTY.
285 */
286 while (tp->t_flags & TF_OPENCLOSE) {
287 error = tty_wait(tp, &tp->t_dcdwait);
288 if (error != 0) {
289 tty_unlock(tp);
290 return (error);
291 }
292 }
293 tp->t_flags |= TF_OPENCLOSE;
294
295 /*
296 * Make sure the "tty" and "cua" device cannot be opened at the
297 * same time. The console is a "tty" device.
298 */
299 if (TTY_CALLOUT(tp, dev)) {
300 if (tp->t_flags & (TF_OPENED_CONS | TF_OPENED_IN)) {
301 error = EBUSY;
302 goto done;
303 }
304 } else {
305 if (tp->t_flags & TF_OPENED_OUT) {
306 error = EBUSY;
307 goto done;
308 }
309 }
310
311 if (tp->t_flags & TF_EXCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) {
312 error = EBUSY;
313 goto done;
314 }
315
316 if (!tty_opened(tp)) {
317 /* Set proper termios flags. */
318 if (TTY_CALLOUT(tp, dev))
319 tp->t_termios = tp->t_termios_init_out;
320 else
321 tp->t_termios = tp->t_termios_init_in;
322 ttydevsw_param(tp, &tp->t_termios);
323 /* Prevent modem control on callout devices and /dev/console. */
324 if (TTY_CALLOUT(tp, dev) || dev == dev_console)
325 tp->t_termios.c_cflag |= CLOCAL;
326
327 ttydevsw_modem(tp, SER_DTR|SER_RTS, 0);
328
329 error = ttydevsw_open(tp);
330 if (error != 0)
331 goto done;
332
333 ttydisc_open(tp);
334 error = tty_watermarks(tp);
335 if (error != 0)
336 goto done;
337 }
338
339 /* Wait for Carrier Detect. */
340 if ((oflags & O_NONBLOCK) == 0 &&
341 (tp->t_termios.c_cflag & CLOCAL) == 0) {
342 while ((ttydevsw_modem(tp, 0, 0) & SER_DCD) == 0) {
343 error = tty_wait(tp, &tp->t_dcdwait);
344 if (error != 0)
345 goto done;
346 }
347 }
348
349 if (dev == dev_console)
350 tp->t_flags |= TF_OPENED_CONS;
351 else if (TTY_CALLOUT(tp, dev))
352 tp->t_flags |= TF_OPENED_OUT;
353 else
354 tp->t_flags |= TF_OPENED_IN;
355 MPASS((tp->t_flags & (TF_OPENED_CONS | TF_OPENED_IN)) == 0 ||
356 (tp->t_flags & TF_OPENED_OUT) == 0);
357
358 done: tp->t_flags &= ~TF_OPENCLOSE;
359 cv_broadcast(&tp->t_dcdwait);
360 ttydev_leave(tp);
361
362 return (error);
363 }
364
365 static int
366 ttydev_close(struct cdev *dev, int fflag, int devtype __unused,
367 struct thread *td __unused)
368 {
369 struct tty *tp = dev->si_drv1;
370
371 tty_lock(tp);
372
373 /*
374 * Don't actually close the device if it is being used as the
375 * console.
376 */
377 MPASS((tp->t_flags & (TF_OPENED_CONS | TF_OPENED_IN)) == 0 ||
378 (tp->t_flags & TF_OPENED_OUT) == 0);
379 if (dev == dev_console)
380 tp->t_flags &= ~TF_OPENED_CONS;
381 else
382 tp->t_flags &= ~(TF_OPENED_IN|TF_OPENED_OUT);
383
384 if (tp->t_flags & TF_OPENED) {
385 tty_unlock(tp);
386 return (0);
387 }
388
389 /* If revoking, flush output now to avoid draining it later. */
390 if (fflag & FREVOKE)
391 tty_flush(tp, FWRITE);
392
393 tp->t_flags &= ~TF_EXCLUDE;
394
395 /* Properly wake up threads that are stuck - revoke(). */
396 tp->t_revokecnt++;
397 tty_wakeup(tp, FREAD|FWRITE);
398 cv_broadcast(&tp->t_bgwait);
399 cv_broadcast(&tp->t_dcdwait);
400
401 ttydev_leave(tp);
402
403 return (0);
404 }
405
406 static __inline int
407 tty_is_ctty(struct tty *tp, struct proc *p)
408 {
409
410 tty_lock_assert(tp, MA_OWNED);
411
412 return (p->p_session == tp->t_session && p->p_flag & P_CONTROLT);
413 }
414
415 int
416 tty_wait_background(struct tty *tp, struct thread *td, int sig)
417 {
418 struct proc *p = td->td_proc;
419 struct pgrp *pg;
420 ksiginfo_t ksi;
421 int error;
422
423 MPASS(sig == SIGTTIN || sig == SIGTTOU);
424 tty_lock_assert(tp, MA_OWNED);
425
426 for (;;) {
427 PROC_LOCK(p);
428 /*
429 * The process should only sleep, when:
430 * - This terminal is the controlling terminal
431 * - Its process group is not the foreground process
432 * group
433 * - The parent process isn't waiting for the child to
434 * exit
435 * - the signal to send to the process isn't masked
436 */
437 if (!tty_is_ctty(tp, p) || p->p_pgrp == tp->t_pgrp) {
438 /* Allow the action to happen. */
439 PROC_UNLOCK(p);
440 return (0);
441 }
442
443 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, sig) ||
444 SIGISMEMBER(td->td_sigmask, sig)) {
445 /* Only allow them in write()/ioctl(). */
446 PROC_UNLOCK(p);
447 return (sig == SIGTTOU ? 0 : EIO);
448 }
449
450 pg = p->p_pgrp;
451 if (p->p_flag & P_PPWAIT || pg->pg_jobc == 0) {
452 /* Don't allow the action to happen. */
453 PROC_UNLOCK(p);
454 return (EIO);
455 }
456 PROC_UNLOCK(p);
457
458 /*
459 * Send the signal and sleep until we're the new
460 * foreground process group.
461 */
462 if (sig != 0) {
463 ksiginfo_init(&ksi);
464 ksi.ksi_code = SI_KERNEL;
465 ksi.ksi_signo = sig;
466 sig = 0;
467 }
468 PGRP_LOCK(pg);
469 pgsignal(pg, ksi.ksi_signo, 1, &ksi);
470 PGRP_UNLOCK(pg);
471
472 error = tty_wait(tp, &tp->t_bgwait);
473 if (error)
474 return (error);
475 }
476 }
477
478 static int
479 ttydev_read(struct cdev *dev, struct uio *uio, int ioflag)
480 {
481 struct tty *tp = dev->si_drv1;
482 int error;
483
484 error = ttydev_enter(tp);
485 if (error)
486 goto done;
487 error = ttydisc_read(tp, uio, ioflag);
488 tty_unlock(tp);
489
490 /*
491 * The read() call should not throw an error when the device is
492 * being destroyed. Silently convert it to an EOF.
493 */
494 done: if (error == ENXIO)
495 error = 0;
496 return (error);
497 }
498
499 static int
500 ttydev_write(struct cdev *dev, struct uio *uio, int ioflag)
501 {
502 struct tty *tp = dev->si_drv1;
503 int error;
504
505 error = ttydev_enter(tp);
506 if (error)
507 return (error);
508
509 if (tp->t_termios.c_lflag & TOSTOP) {
510 error = tty_wait_background(tp, curthread, SIGTTOU);
511 if (error)
512 goto done;
513 }
514
515 if (ioflag & IO_NDELAY && tp->t_flags & TF_BUSY_OUT) {
516 /* Allow non-blocking writes to bypass serialization. */
517 error = ttydisc_write(tp, uio, ioflag);
518 } else {
519 /* Serialize write() calls. */
520 while (tp->t_flags & TF_BUSY_OUT) {
521 error = tty_wait(tp, &tp->t_outserwait);
522 if (error)
523 goto done;
524 }
525
526 tp->t_flags |= TF_BUSY_OUT;
527 error = ttydisc_write(tp, uio, ioflag);
528 tp->t_flags &= ~TF_BUSY_OUT;
529 cv_signal(&tp->t_outserwait);
530 }
531
532 done: tty_unlock(tp);
533 return (error);
534 }
535
536 static int
537 ttydev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
538 struct thread *td)
539 {
540 struct tty *tp = dev->si_drv1;
541 int error;
542
543 error = ttydev_enter(tp);
544 if (error)
545 return (error);
546
547 switch (cmd) {
548 case TIOCCBRK:
549 case TIOCCONS:
550 case TIOCDRAIN:
551 case TIOCEXCL:
552 case TIOCFLUSH:
553 case TIOCNXCL:
554 case TIOCSBRK:
555 case TIOCSCTTY:
556 case TIOCSETA:
557 case TIOCSETAF:
558 case TIOCSETAW:
559 case TIOCSPGRP:
560 case TIOCSTART:
561 case TIOCSTAT:
562 case TIOCSTI:
563 case TIOCSTOP:
564 case TIOCSWINSZ:
565 #if 0
566 case TIOCSDRAINWAIT:
567 case TIOCSETD:
568 #endif
569 #ifdef COMPAT_43TTY
570 case TIOCLBIC:
571 case TIOCLBIS:
572 case TIOCLSET:
573 case TIOCSETC:
574 case OTIOCSETD:
575 case TIOCSETN:
576 case TIOCSETP:
577 case TIOCSLTC:
578 #endif /* COMPAT_43TTY */
579 /*
580 * If the ioctl() causes the TTY to be modified, let it
581 * wait in the background.
582 */
583 error = tty_wait_background(tp, curthread, SIGTTOU);
584 if (error)
585 goto done;
586 }
587
588 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) {
589 struct termios *old = &tp->t_termios;
590 struct termios *new = (struct termios *)data;
591 struct termios *lock = TTY_CALLOUT(tp, dev) ?
592 &tp->t_termios_lock_out : &tp->t_termios_lock_in;
593 int cc;
594
595 /*
596 * Lock state devices. Just overwrite the values of the
597 * commands that are currently in use.
598 */
599 new->c_iflag = (old->c_iflag & lock->c_iflag) |
600 (new->c_iflag & ~lock->c_iflag);
601 new->c_oflag = (old->c_oflag & lock->c_oflag) |
602 (new->c_oflag & ~lock->c_oflag);
603 new->c_cflag = (old->c_cflag & lock->c_cflag) |
604 (new->c_cflag & ~lock->c_cflag);
605 new->c_lflag = (old->c_lflag & lock->c_lflag) |
606 (new->c_lflag & ~lock->c_lflag);
607 for (cc = 0; cc < NCCS; ++cc)
608 if (lock->c_cc[cc])
609 new->c_cc[cc] = old->c_cc[cc];
610 if (lock->c_ispeed)
611 new->c_ispeed = old->c_ispeed;
612 if (lock->c_ospeed)
613 new->c_ospeed = old->c_ospeed;
614 }
615
616 error = tty_ioctl(tp, cmd, data, fflag, td);
617 done: tty_unlock(tp);
618
619 return (error);
620 }
621
622 static int
623 ttydev_poll(struct cdev *dev, int events, struct thread *td)
624 {
625 struct tty *tp = dev->si_drv1;
626 int error, revents = 0;
627
628 error = ttydev_enter(tp);
629 if (error)
630 return ((events & (POLLIN|POLLRDNORM)) | POLLHUP);
631
632 if (events & (POLLIN|POLLRDNORM)) {
633 /* See if we can read something. */
634 if (ttydisc_read_poll(tp) > 0)
635 revents |= events & (POLLIN|POLLRDNORM);
636 }
637
638 if (tp->t_flags & TF_ZOMBIE) {
639 /* Hangup flag on zombie state. */
640 revents |= POLLHUP;
641 } else if (events & (POLLOUT|POLLWRNORM)) {
642 /* See if we can write something. */
643 if (ttydisc_write_poll(tp) > 0)
644 revents |= events & (POLLOUT|POLLWRNORM);
645 }
646
647 if (revents == 0) {
648 if (events & (POLLIN|POLLRDNORM))
649 selrecord(td, &tp->t_inpoll);
650 if (events & (POLLOUT|POLLWRNORM))
651 selrecord(td, &tp->t_outpoll);
652 }
653
654 tty_unlock(tp);
655
656 return (revents);
657 }
658
659 static int
660 ttydev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
661 int nprot, vm_memattr_t *memattr)
662 {
663 struct tty *tp = dev->si_drv1;
664 int error;
665
666 /* Handle mmap() through the driver. */
667
668 error = ttydev_enter(tp);
669 if (error)
670 return (-1);
671 error = ttydevsw_mmap(tp, offset, paddr, nprot, memattr);
672 tty_unlock(tp);
673
674 return (error);
675 }
676
677 /*
678 * kqueue support.
679 */
680
681 static void
682 tty_kqops_read_detach(struct knote *kn)
683 {
684 struct tty *tp = kn->kn_hook;
685
686 knlist_remove(&tp->t_inpoll.si_note, kn, 0);
687 }
688
689 static int
690 tty_kqops_read_event(struct knote *kn, long hint __unused)
691 {
692 struct tty *tp = kn->kn_hook;
693
694 tty_lock_assert(tp, MA_OWNED);
695
696 if (tty_gone(tp) || tp->t_flags & TF_ZOMBIE) {
697 kn->kn_flags |= EV_EOF;
698 return (1);
699 } else {
700 kn->kn_data = ttydisc_read_poll(tp);
701 return (kn->kn_data > 0);
702 }
703 }
704
705 static void
706 tty_kqops_write_detach(struct knote *kn)
707 {
708 struct tty *tp = kn->kn_hook;
709
710 knlist_remove(&tp->t_outpoll.si_note, kn, 0);
711 }
712
713 static int
714 tty_kqops_write_event(struct knote *kn, long hint __unused)
715 {
716 struct tty *tp = kn->kn_hook;
717
718 tty_lock_assert(tp, MA_OWNED);
719
720 if (tty_gone(tp)) {
721 kn->kn_flags |= EV_EOF;
722 return (1);
723 } else {
724 kn->kn_data = ttydisc_write_poll(tp);
725 return (kn->kn_data > 0);
726 }
727 }
728
729 static struct filterops tty_kqops_read = {
730 .f_isfd = 1,
731 .f_detach = tty_kqops_read_detach,
732 .f_event = tty_kqops_read_event,
733 };
734
735 static struct filterops tty_kqops_write = {
736 .f_isfd = 1,
737 .f_detach = tty_kqops_write_detach,
738 .f_event = tty_kqops_write_event,
739 };
740
741 static int
742 ttydev_kqfilter(struct cdev *dev, struct knote *kn)
743 {
744 struct tty *tp = dev->si_drv1;
745 int error;
746
747 error = ttydev_enter(tp);
748 if (error)
749 return (error);
750
751 switch (kn->kn_filter) {
752 case EVFILT_READ:
753 kn->kn_hook = tp;
754 kn->kn_fop = &tty_kqops_read;
755 knlist_add(&tp->t_inpoll.si_note, kn, 1);
756 break;
757 case EVFILT_WRITE:
758 kn->kn_hook = tp;
759 kn->kn_fop = &tty_kqops_write;
760 knlist_add(&tp->t_outpoll.si_note, kn, 1);
761 break;
762 default:
763 error = EINVAL;
764 break;
765 }
766
767 tty_unlock(tp);
768 return (error);
769 }
770
771 static struct cdevsw ttydev_cdevsw = {
772 .d_version = D_VERSION,
773 .d_open = ttydev_open,
774 .d_close = ttydev_close,
775 .d_read = ttydev_read,
776 .d_write = ttydev_write,
777 .d_ioctl = ttydev_ioctl,
778 .d_kqfilter = ttydev_kqfilter,
779 .d_poll = ttydev_poll,
780 .d_mmap = ttydev_mmap,
781 .d_name = "ttydev",
782 .d_flags = D_TTY,
783 };
784
785 /*
786 * Init/lock-state devices
787 */
788
789 static int
790 ttyil_open(struct cdev *dev, int oflags __unused, int devtype __unused,
791 struct thread *td)
792 {
793 struct tty *tp;
794 int error;
795
796 tp = dev->si_drv1;
797 error = 0;
798 tty_lock(tp);
799 if (tty_gone(tp))
800 error = ENODEV;
801 tty_unlock(tp);
802
803 return (error);
804 }
805
806 static int
807 ttyil_close(struct cdev *dev __unused, int flag __unused, int mode __unused,
808 struct thread *td __unused)
809 {
810
811 return (0);
812 }
813
814 static int
815 ttyil_rdwr(struct cdev *dev __unused, struct uio *uio __unused,
816 int ioflag __unused)
817 {
818
819 return (ENODEV);
820 }
821
822 static int
823 ttyil_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
824 struct thread *td)
825 {
826 struct tty *tp = dev->si_drv1;
827 int error;
828
829 tty_lock(tp);
830 if (tty_gone(tp)) {
831 error = ENODEV;
832 goto done;
833 }
834
835 error = ttydevsw_cioctl(tp, dev2unit(dev), cmd, data, td);
836 if (error != ENOIOCTL)
837 goto done;
838 error = 0;
839
840 switch (cmd) {
841 case TIOCGETA:
842 /* Obtain terminal flags through tcgetattr(). */
843 *(struct termios*)data = *(struct termios*)dev->si_drv2;
844 break;
845 case TIOCSETA:
846 /* Set terminal flags through tcsetattr(). */
847 error = priv_check(td, PRIV_TTY_SETA);
848 if (error)
849 break;
850 *(struct termios*)dev->si_drv2 = *(struct termios*)data;
851 break;
852 case TIOCGETD:
853 *(int *)data = TTYDISC;
854 break;
855 case TIOCGWINSZ:
856 bzero(data, sizeof(struct winsize));
857 break;
858 default:
859 error = ENOTTY;
860 }
861
862 done: tty_unlock(tp);
863 return (error);
864 }
865
866 static struct cdevsw ttyil_cdevsw = {
867 .d_version = D_VERSION,
868 .d_open = ttyil_open,
869 .d_close = ttyil_close,
870 .d_read = ttyil_rdwr,
871 .d_write = ttyil_rdwr,
872 .d_ioctl = ttyil_ioctl,
873 .d_name = "ttyil",
874 .d_flags = D_TTY,
875 };
876
877 static void
878 tty_init_termios(struct tty *tp)
879 {
880 struct termios *t = &tp->t_termios_init_in;
881
882 t->c_cflag = TTYDEF_CFLAG;
883 t->c_iflag = TTYDEF_IFLAG;
884 t->c_lflag = TTYDEF_LFLAG;
885 t->c_oflag = TTYDEF_OFLAG;
886 t->c_ispeed = TTYDEF_SPEED;
887 t->c_ospeed = TTYDEF_SPEED;
888 memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars);
889
890 tp->t_termios_init_out = *t;
891 }
892
893 void
894 tty_init_console(struct tty *tp, speed_t s)
895 {
896 struct termios *ti = &tp->t_termios_init_in;
897 struct termios *to = &tp->t_termios_init_out;
898
899 if (s != 0) {
900 ti->c_ispeed = ti->c_ospeed = s;
901 to->c_ispeed = to->c_ospeed = s;
902 }
903
904 ti->c_cflag |= CLOCAL;
905 to->c_cflag |= CLOCAL;
906 }
907
908 /*
909 * Standard device routine implementations, mostly meant for
910 * pseudo-terminal device drivers. When a driver creates a new terminal
911 * device class, missing routines are patched.
912 */
913
914 static int
915 ttydevsw_defopen(struct tty *tp __unused)
916 {
917
918 return (0);
919 }
920
921 static void
922 ttydevsw_defclose(struct tty *tp __unused)
923 {
924
925 }
926
927 static void
928 ttydevsw_defoutwakeup(struct tty *tp __unused)
929 {
930
931 panic("Terminal device has output, while not implemented");
932 }
933
934 static void
935 ttydevsw_definwakeup(struct tty *tp __unused)
936 {
937
938 }
939
940 static int
941 ttydevsw_defioctl(struct tty *tp __unused, u_long cmd __unused,
942 caddr_t data __unused, struct thread *td __unused)
943 {
944
945 return (ENOIOCTL);
946 }
947
948 static int
949 ttydevsw_defcioctl(struct tty *tp __unused, int unit __unused,
950 u_long cmd __unused, caddr_t data __unused, struct thread *td __unused)
951 {
952
953 return (ENOIOCTL);
954 }
955
956 static int
957 ttydevsw_defparam(struct tty *tp __unused, struct termios *t)
958 {
959
960 /*
961 * Allow the baud rate to be adjusted for pseudo-devices, but at
962 * least restrict it to 115200 to prevent excessive buffer
963 * usage. Also disallow 0, to prevent foot shooting.
964 */
965 if (t->c_ispeed < B50)
966 t->c_ispeed = B50;
967 else if (t->c_ispeed > B115200)
968 t->c_ispeed = B115200;
969 if (t->c_ospeed < B50)
970 t->c_ospeed = B50;
971 else if (t->c_ospeed > B115200)
972 t->c_ospeed = B115200;
973 t->c_cflag |= CREAD;
974
975 return (0);
976 }
977
978 static int
979 ttydevsw_defmodem(struct tty *tp __unused, int sigon __unused,
980 int sigoff __unused)
981 {
982
983 /* Simulate a carrier to make the TTY layer happy. */
984 return (SER_DCD);
985 }
986
987 static int
988 ttydevsw_defmmap(struct tty *tp __unused, vm_ooffset_t offset __unused,
989 vm_paddr_t *paddr __unused, int nprot __unused,
990 vm_memattr_t *memattr __unused)
991 {
992
993 return (-1);
994 }
995
996 static void
997 ttydevsw_defpktnotify(struct tty *tp __unused, char event __unused)
998 {
999
1000 }
1001
1002 static void
1003 ttydevsw_deffree(void *softc __unused)
1004 {
1005
1006 panic("Terminal device freed without a free-handler");
1007 }
1008
1009 static bool
1010 ttydevsw_defbusy(struct tty *tp __unused)
1011 {
1012
1013 return (FALSE);
1014 }
1015
1016 /*
1017 * TTY allocation and deallocation. TTY devices can be deallocated when
1018 * the driver doesn't use it anymore, when the TTY isn't a session's
1019 * controlling TTY and when the device node isn't opened through devfs.
1020 */
1021
1022 struct tty *
1023 tty_alloc(struct ttydevsw *tsw, void *sc)
1024 {
1025
1026 return (tty_alloc_mutex(tsw, sc, NULL));
1027 }
1028
1029 struct tty *
1030 tty_alloc_mutex(struct ttydevsw *tsw, void *sc, struct mtx *mutex)
1031 {
1032 struct tty *tp;
1033
1034 /* Make sure the driver defines all routines. */
1035 #define PATCH_FUNC(x) do { \
1036 if (tsw->tsw_ ## x == NULL) \
1037 tsw->tsw_ ## x = ttydevsw_def ## x; \
1038 } while (0)
1039 PATCH_FUNC(open);
1040 PATCH_FUNC(close);
1041 PATCH_FUNC(outwakeup);
1042 PATCH_FUNC(inwakeup);
1043 PATCH_FUNC(ioctl);
1044 PATCH_FUNC(cioctl);
1045 PATCH_FUNC(param);
1046 PATCH_FUNC(modem);
1047 PATCH_FUNC(mmap);
1048 PATCH_FUNC(pktnotify);
1049 PATCH_FUNC(free);
1050 PATCH_FUNC(busy);
1051 #undef PATCH_FUNC
1052
1053 tp = malloc(sizeof(struct tty), M_TTY, M_WAITOK|M_ZERO);
1054 tp->t_devsw = tsw;
1055 tp->t_devswsoftc = sc;
1056 tp->t_flags = tsw->tsw_flags;
1057 tp->t_drainwait = tty_drainwait;
1058
1059 tty_init_termios(tp);
1060
1061 cv_init(&tp->t_inwait, "ttyin");
1062 cv_init(&tp->t_outwait, "ttyout");
1063 cv_init(&tp->t_outserwait, "ttyosr");
1064 cv_init(&tp->t_bgwait, "ttybg");
1065 cv_init(&tp->t_dcdwait, "ttydcd");
1066
1067 /* Allow drivers to use a custom mutex to lock the TTY. */
1068 if (mutex != NULL) {
1069 tp->t_mtx = mutex;
1070 } else {
1071 tp->t_mtx = &tp->t_mtxobj;
1072 mtx_init(&tp->t_mtxobj, "ttymtx", NULL, MTX_DEF);
1073 }
1074
1075 knlist_init_mtx(&tp->t_inpoll.si_note, tp->t_mtx);
1076 knlist_init_mtx(&tp->t_outpoll.si_note, tp->t_mtx);
1077
1078 return (tp);
1079 }
1080
1081 static void
1082 tty_dealloc(void *arg)
1083 {
1084 struct tty *tp = arg;
1085
1086 /*
1087 * ttyydev_leave() usually frees the i/o queues earlier, but it is
1088 * not always called between queue allocation and here. The queues
1089 * may be allocated by ioctls on a pty control device without the
1090 * corresponding pty slave device ever being open, or after it is
1091 * closed.
1092 */
1093 ttyinq_free(&tp->t_inq);
1094 ttyoutq_free(&tp->t_outq);
1095 seldrain(&tp->t_inpoll);
1096 seldrain(&tp->t_outpoll);
1097 knlist_destroy(&tp->t_inpoll.si_note);
1098 knlist_destroy(&tp->t_outpoll.si_note);
1099
1100 cv_destroy(&tp->t_inwait);
1101 cv_destroy(&tp->t_outwait);
1102 cv_destroy(&tp->t_bgwait);
1103 cv_destroy(&tp->t_dcdwait);
1104 cv_destroy(&tp->t_outserwait);
1105
1106 if (tp->t_mtx == &tp->t_mtxobj)
1107 mtx_destroy(&tp->t_mtxobj);
1108 ttydevsw_free(tp);
1109 free(tp, M_TTY);
1110 }
1111
1112 static void
1113 tty_rel_free(struct tty *tp)
1114 {
1115 struct cdev *dev;
1116
1117 tty_lock_assert(tp, MA_OWNED);
1118
1119 #define TF_ACTIVITY (TF_GONE|TF_OPENED|TF_HOOK|TF_OPENCLOSE)
1120 if (tp->t_sessioncnt != 0 || (tp->t_flags & TF_ACTIVITY) != TF_GONE) {
1121 /* TTY is still in use. */
1122 tty_unlock(tp);
1123 return;
1124 }
1125
1126 /* TTY can be deallocated. */
1127 dev = tp->t_dev;
1128 tp->t_dev = NULL;
1129 tty_unlock(tp);
1130
1131 if (dev != NULL) {
1132 sx_xlock(&tty_list_sx);
1133 TAILQ_REMOVE(&tty_list, tp, t_list);
1134 tty_list_count--;
1135 sx_xunlock(&tty_list_sx);
1136 destroy_dev_sched_cb(dev, tty_dealloc, tp);
1137 }
1138 }
1139
1140 void
1141 tty_rel_pgrp(struct tty *tp, struct pgrp *pg)
1142 {
1143
1144 MPASS(tp->t_sessioncnt > 0);
1145 tty_lock_assert(tp, MA_OWNED);
1146
1147 if (tp->t_pgrp == pg)
1148 tp->t_pgrp = NULL;
1149
1150 tty_unlock(tp);
1151 }
1152
1153 void
1154 tty_rel_sess(struct tty *tp, struct session *sess)
1155 {
1156
1157 MPASS(tp->t_sessioncnt > 0);
1158
1159 /* Current session has left. */
1160 if (tp->t_session == sess) {
1161 tp->t_session = NULL;
1162 MPASS(tp->t_pgrp == NULL);
1163 }
1164 tp->t_sessioncnt--;
1165 tty_rel_free(tp);
1166 }
1167
1168 void
1169 tty_rel_gone(struct tty *tp)
1170 {
1171
1172 MPASS(!tty_gone(tp));
1173
1174 /* Simulate carrier removal. */
1175 ttydisc_modem(tp, 0);
1176
1177 /* Wake up all blocked threads. */
1178 tty_wakeup(tp, FREAD|FWRITE);
1179 cv_broadcast(&tp->t_bgwait);
1180 cv_broadcast(&tp->t_dcdwait);
1181
1182 tp->t_flags |= TF_GONE;
1183 tty_rel_free(tp);
1184 }
1185
1186 /*
1187 * Exposing information about current TTY's through sysctl
1188 */
1189
1190 static void
1191 tty_to_xtty(struct tty *tp, struct xtty *xt)
1192 {
1193
1194 tty_lock_assert(tp, MA_OWNED);
1195
1196 xt->xt_size = sizeof(struct xtty);
1197 xt->xt_insize = ttyinq_getsize(&tp->t_inq);
1198 xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq);
1199 xt->xt_inlc = ttyinq_bytesline(&tp->t_inq);
1200 xt->xt_inlow = tp->t_inlow;
1201 xt->xt_outsize = ttyoutq_getsize(&tp->t_outq);
1202 xt->xt_outcc = ttyoutq_bytesused(&tp->t_outq);
1203 xt->xt_outlow = tp->t_outlow;
1204 xt->xt_column = tp->t_column;
1205 xt->xt_pgid = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
1206 xt->xt_sid = tp->t_session ? tp->t_session->s_sid : 0;
1207 xt->xt_flags = tp->t_flags;
1208 xt->xt_dev = tp->t_dev ? dev2udev(tp->t_dev) : NODEV;
1209 }
1210
1211 static int
1212 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
1213 {
1214 unsigned long lsize;
1215 struct xtty *xtlist, *xt;
1216 struct tty *tp;
1217 int error;
1218
1219 sx_slock(&tty_list_sx);
1220 lsize = tty_list_count * sizeof(struct xtty);
1221 if (lsize == 0) {
1222 sx_sunlock(&tty_list_sx);
1223 return (0);
1224 }
1225
1226 xtlist = xt = malloc(lsize, M_TTY, M_WAITOK);
1227
1228 TAILQ_FOREACH(tp, &tty_list, t_list) {
1229 tty_lock(tp);
1230 tty_to_xtty(tp, xt);
1231 tty_unlock(tp);
1232 xt++;
1233 }
1234 sx_sunlock(&tty_list_sx);
1235
1236 error = SYSCTL_OUT(req, xtlist, lsize);
1237 free(xtlist, M_TTY);
1238 return (error);
1239 }
1240
1241 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
1242 0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs");
1243
1244 /*
1245 * Device node creation. Device has been set up, now we can expose it to
1246 * the user.
1247 */
1248
1249 int
1250 tty_makedevf(struct tty *tp, struct ucred *cred, int flags,
1251 const char *fmt, ...)
1252 {
1253 va_list ap;
1254 struct make_dev_args args;
1255 struct cdev *dev, *init, *lock, *cua, *cinit, *clock;
1256 const char *prefix = "tty";
1257 char name[SPECNAMELEN - 3]; /* for "tty" and "cua". */
1258 uid_t uid;
1259 gid_t gid;
1260 mode_t mode;
1261 int error;
1262
1263 /* Remove "tty" prefix from devices like PTY's. */
1264 if (tp->t_flags & TF_NOPREFIX)
1265 prefix = "";
1266
1267 va_start(ap, fmt);
1268 vsnrprintf(name, sizeof name, 32, fmt, ap);
1269 va_end(ap);
1270
1271 if (cred == NULL) {
1272 /* System device. */
1273 uid = UID_ROOT;
1274 gid = GID_WHEEL;
1275 mode = S_IRUSR|S_IWUSR;
1276 } else {
1277 /* User device. */
1278 uid = cred->cr_ruid;
1279 gid = GID_TTY;
1280 mode = S_IRUSR|S_IWUSR|S_IWGRP;
1281 }
1282
1283 flags = flags & TTYMK_CLONING ? MAKEDEV_REF : 0;
1284 flags |= MAKEDEV_CHECKNAME;
1285
1286 /* Master call-in device. */
1287 make_dev_args_init(&args);
1288 args.mda_flags = flags;
1289 args.mda_devsw = &ttydev_cdevsw;
1290 args.mda_cr = cred;
1291 args.mda_uid = uid;
1292 args.mda_gid = gid;
1293 args.mda_mode = mode;
1294 args.mda_si_drv1 = tp;
1295 error = make_dev_s(&args, &dev, "%s%s", prefix, name);
1296 if (error != 0)
1297 return (error);
1298 tp->t_dev = dev;
1299
1300 init = lock = cua = cinit = clock = NULL;
1301
1302 /* Slave call-in devices. */
1303 if (tp->t_flags & TF_INITLOCK) {
1304 args.mda_devsw = &ttyil_cdevsw;
1305 args.mda_unit = TTYUNIT_INIT;
1306 args.mda_si_drv1 = tp;
1307 args.mda_si_drv2 = &tp->t_termios_init_in;
1308 error = make_dev_s(&args, &init, "%s%s.init", prefix, name);
1309 if (error != 0)
1310 goto fail;
1311 dev_depends(dev, init);
1312
1313 args.mda_unit = TTYUNIT_LOCK;
1314 args.mda_si_drv2 = &tp->t_termios_lock_in;
1315 error = make_dev_s(&args, &lock, "%s%s.lock", prefix, name);
1316 if (error != 0)
1317 goto fail;
1318 dev_depends(dev, lock);
1319 }
1320
1321 /* Call-out devices. */
1322 if (tp->t_flags & TF_CALLOUT) {
1323 make_dev_args_init(&args);
1324 args.mda_flags = flags;
1325 args.mda_devsw = &ttydev_cdevsw;
1326 args.mda_cr = cred;
1327 args.mda_uid = UID_UUCP;
1328 args.mda_gid = GID_DIALER;
1329 args.mda_mode = 0660;
1330 args.mda_unit = TTYUNIT_CALLOUT;
1331 args.mda_si_drv1 = tp;
1332 error = make_dev_s(&args, &cua, "cua%s", name);
1333 if (error != 0)
1334 goto fail;
1335 dev_depends(dev, cua);
1336
1337 /* Slave call-out devices. */
1338 if (tp->t_flags & TF_INITLOCK) {
1339 args.mda_devsw = &ttyil_cdevsw;
1340 args.mda_unit = TTYUNIT_CALLOUT | TTYUNIT_INIT;
1341 args.mda_si_drv2 = &tp->t_termios_init_out;
1342 error = make_dev_s(&args, &cinit, "cua%s.init", name);
1343 if (error != 0)
1344 goto fail;
1345 dev_depends(dev, cinit);
1346
1347 args.mda_unit = TTYUNIT_CALLOUT | TTYUNIT_LOCK;
1348 args.mda_si_drv2 = &tp->t_termios_lock_out;
1349 error = make_dev_s(&args, &clock, "cua%s.lock", name);
1350 if (error != 0)
1351 goto fail;
1352 dev_depends(dev, clock);
1353 }
1354 }
1355
1356 sx_xlock(&tty_list_sx);
1357 TAILQ_INSERT_TAIL(&tty_list, tp, t_list);
1358 tty_list_count++;
1359 sx_xunlock(&tty_list_sx);
1360
1361 return (0);
1362
1363 fail:
1364 destroy_dev(dev);
1365 if (init)
1366 destroy_dev(init);
1367 if (lock)
1368 destroy_dev(lock);
1369 if (cinit)
1370 destroy_dev(cinit);
1371 if (clock)
1372 destroy_dev(clock);
1373
1374 return (error);
1375 }
1376
1377 /*
1378 * Signalling processes.
1379 */
1380
1381 void
1382 tty_signal_sessleader(struct tty *tp, int sig)
1383 {
1384 struct proc *p;
1385
1386 tty_lock_assert(tp, MA_OWNED);
1387 MPASS(sig >= 1 && sig < NSIG);
1388
1389 /* Make signals start output again. */
1390 tp->t_flags &= ~TF_STOPPED;
1391
1392 if (tp->t_session != NULL && tp->t_session->s_leader != NULL) {
1393 p = tp->t_session->s_leader;
1394 PROC_LOCK(p);
1395 kern_psignal(p, sig);
1396 PROC_UNLOCK(p);
1397 }
1398 }
1399
1400 void
1401 tty_signal_pgrp(struct tty *tp, int sig)
1402 {
1403 ksiginfo_t ksi;
1404
1405 tty_lock_assert(tp, MA_OWNED);
1406 MPASS(sig >= 1 && sig < NSIG);
1407
1408 /* Make signals start output again. */
1409 tp->t_flags &= ~TF_STOPPED;
1410
1411 if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO))
1412 tty_info(tp);
1413 if (tp->t_pgrp != NULL) {
1414 ksiginfo_init(&ksi);
1415 ksi.ksi_signo = sig;
1416 ksi.ksi_code = SI_KERNEL;
1417 PGRP_LOCK(tp->t_pgrp);
1418 pgsignal(tp->t_pgrp, sig, 1, &ksi);
1419 PGRP_UNLOCK(tp->t_pgrp);
1420 }
1421 }
1422
1423 void
1424 tty_wakeup(struct tty *tp, int flags)
1425 {
1426
1427 if (tp->t_flags & TF_ASYNC && tp->t_sigio != NULL)
1428 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL));
1429
1430 if (flags & FWRITE) {
1431 cv_broadcast(&tp->t_outwait);
1432 selwakeup(&tp->t_outpoll);
1433 KNOTE_LOCKED(&tp->t_outpoll.si_note, 0);
1434 }
1435 if (flags & FREAD) {
1436 cv_broadcast(&tp->t_inwait);
1437 selwakeup(&tp->t_inpoll);
1438 KNOTE_LOCKED(&tp->t_inpoll.si_note, 0);
1439 }
1440 }
1441
1442 int
1443 tty_wait(struct tty *tp, struct cv *cv)
1444 {
1445 int error;
1446 int revokecnt = tp->t_revokecnt;
1447
1448 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED);
1449 MPASS(!tty_gone(tp));
1450
1451 error = cv_wait_sig(cv, tp->t_mtx);
1452
1453 /* Bail out when the device slipped away. */
1454 if (tty_gone(tp))
1455 return (ENXIO);
1456
1457 /* Restart the system call when we may have been revoked. */
1458 if (tp->t_revokecnt != revokecnt)
1459 return (ERESTART);
1460
1461 return (error);
1462 }
1463
1464 int
1465 tty_timedwait(struct tty *tp, struct cv *cv, int hz)
1466 {
1467 int error;
1468 int revokecnt = tp->t_revokecnt;
1469
1470 tty_lock_assert(tp, MA_OWNED|MA_NOTRECURSED);
1471 MPASS(!tty_gone(tp));
1472
1473 error = cv_timedwait_sig(cv, tp->t_mtx, hz);
1474
1475 /* Bail out when the device slipped away. */
1476 if (tty_gone(tp))
1477 return (ENXIO);
1478
1479 /* Restart the system call when we may have been revoked. */
1480 if (tp->t_revokecnt != revokecnt)
1481 return (ERESTART);
1482
1483 return (error);
1484 }
1485
1486 void
1487 tty_flush(struct tty *tp, int flags)
1488 {
1489
1490 if (flags & FWRITE) {
1491 tp->t_flags &= ~TF_HIWAT_OUT;
1492 ttyoutq_flush(&tp->t_outq);
1493 tty_wakeup(tp, FWRITE);
1494 if (!tty_gone(tp)) {
1495 ttydevsw_outwakeup(tp);
1496 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHWRITE);
1497 }
1498 }
1499 if (flags & FREAD) {
1500 tty_hiwat_in_unblock(tp);
1501 ttyinq_flush(&tp->t_inq);
1502 tty_wakeup(tp, FREAD);
1503 if (!tty_gone(tp)) {
1504 ttydevsw_inwakeup(tp);
1505 ttydevsw_pktnotify(tp, TIOCPKT_FLUSHREAD);
1506 }
1507 }
1508 }
1509
1510 void
1511 tty_set_winsize(struct tty *tp, const struct winsize *wsz)
1512 {
1513
1514 if (memcmp(&tp->t_winsize, wsz, sizeof(*wsz)) == 0)
1515 return;
1516 tp->t_winsize = *wsz;
1517 tty_signal_pgrp(tp, SIGWINCH);
1518 }
1519
1520 static int
1521 tty_generic_ioctl(struct tty *tp, u_long cmd, void *data, int fflag,
1522 struct thread *td)
1523 {
1524 int error;
1525
1526 switch (cmd) {
1527 /*
1528 * Modem commands.
1529 * The SER_* and TIOCM_* flags are the same, but one bit
1530 * shifted. I don't know why.
1531 */
1532 case TIOCSDTR:
1533 ttydevsw_modem(tp, SER_DTR, 0);
1534 return (0);
1535 case TIOCCDTR:
1536 ttydevsw_modem(tp, 0, SER_DTR);
1537 return (0);
1538 case TIOCMSET: {
1539 int bits = *(int *)data;
1540 ttydevsw_modem(tp,
1541 (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1,
1542 ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1);
1543 return (0);
1544 }
1545 case TIOCMBIS: {
1546 int bits = *(int *)data;
1547 ttydevsw_modem(tp, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1, 0);
1548 return (0);
1549 }
1550 case TIOCMBIC: {
1551 int bits = *(int *)data;
1552 ttydevsw_modem(tp, 0, (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1);
1553 return (0);
1554 }
1555 case TIOCMGET:
1556 *(int *)data = TIOCM_LE + (ttydevsw_modem(tp, 0, 0) << 1);
1557 return (0);
1558
1559 case FIOASYNC:
1560 if (*(int *)data)
1561 tp->t_flags |= TF_ASYNC;
1562 else
1563 tp->t_flags &= ~TF_ASYNC;
1564 return (0);
1565 case FIONBIO:
1566 /* This device supports non-blocking operation. */
1567 return (0);
1568 case FIONREAD:
1569 *(int *)data = ttyinq_bytescanonicalized(&tp->t_inq);
1570 return (0);
1571 case FIONWRITE:
1572 case TIOCOUTQ:
1573 *(int *)data = ttyoutq_bytesused(&tp->t_outq);
1574 return (0);
1575 case FIOSETOWN:
1576 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc))
1577 /* Not allowed to set ownership. */
1578 return (ENOTTY);
1579
1580 /* Temporarily unlock the TTY to set ownership. */
1581 tty_unlock(tp);
1582 error = fsetown(*(int *)data, &tp->t_sigio);
1583 tty_lock(tp);
1584 return (error);
1585 case FIOGETOWN:
1586 if (tp->t_session != NULL && !tty_is_ctty(tp, td->td_proc))
1587 /* Not allowed to set ownership. */
1588 return (ENOTTY);
1589
1590 /* Get ownership. */
1591 *(int *)data = fgetown(&tp->t_sigio);
1592 return (0);
1593 case TIOCGETA:
1594 /* Obtain terminal flags through tcgetattr(). */
1595 *(struct termios*)data = tp->t_termios;
1596 return (0);
1597 case TIOCSETA:
1598 case TIOCSETAW:
1599 case TIOCSETAF: {
1600 struct termios *t = data;
1601
1602 /*
1603 * Who makes up these funny rules? According to POSIX,
1604 * input baud rate is set equal to the output baud rate
1605 * when zero.
1606 */
1607 if (t->c_ispeed == 0)
1608 t->c_ispeed = t->c_ospeed;
1609
1610 /* Discard any unsupported bits. */
1611 t->c_iflag &= TTYSUP_IFLAG;
1612 t->c_oflag &= TTYSUP_OFLAG;
1613 t->c_lflag &= TTYSUP_LFLAG;
1614 t->c_cflag &= TTYSUP_CFLAG;
1615
1616 /* Set terminal flags through tcsetattr(). */
1617 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
1618 error = tty_drain(tp, 0);
1619 if (error)
1620 return (error);
1621 if (cmd == TIOCSETAF)
1622 tty_flush(tp, FREAD);
1623 }
1624
1625 /*
1626 * Only call param() when the flags really change.
1627 */
1628 if ((t->c_cflag & CIGNORE) == 0 &&
1629 (tp->t_termios.c_cflag != t->c_cflag ||
1630 ((tp->t_termios.c_iflag ^ t->c_iflag) &
1631 (IXON|IXOFF|IXANY)) ||
1632 tp->t_termios.c_ispeed != t->c_ispeed ||
1633 tp->t_termios.c_ospeed != t->c_ospeed)) {
1634 error = ttydevsw_param(tp, t);
1635 if (error)
1636 return (error);
1637
1638 /* XXX: CLOCAL? */
1639
1640 tp->t_termios.c_cflag = t->c_cflag & ~CIGNORE;
1641 tp->t_termios.c_ispeed = t->c_ispeed;
1642 tp->t_termios.c_ospeed = t->c_ospeed;
1643
1644 /* Baud rate has changed - update watermarks. */
1645 error = tty_watermarks(tp);
1646 if (error)
1647 return (error);
1648 }
1649
1650 /* Copy new non-device driver parameters. */
1651 tp->t_termios.c_iflag = t->c_iflag;
1652 tp->t_termios.c_oflag = t->c_oflag;
1653 tp->t_termios.c_lflag = t->c_lflag;
1654 memcpy(&tp->t_termios.c_cc, t->c_cc, sizeof t->c_cc);
1655
1656 ttydisc_optimize(tp);
1657
1658 if ((t->c_lflag & ICANON) == 0) {
1659 /*
1660 * When in non-canonical mode, wake up all
1661 * readers. Canonicalize any partial input. VMIN
1662 * and VTIME could also be adjusted.
1663 */
1664 ttyinq_canonicalize(&tp->t_inq);
1665 tty_wakeup(tp, FREAD);
1666 }
1667
1668 /*
1669 * For packet mode: notify the PTY consumer that VSTOP
1670 * and VSTART may have been changed.
1671 */
1672 if (tp->t_termios.c_iflag & IXON &&
1673 tp->t_termios.c_cc[VSTOP] == CTRL('S') &&
1674 tp->t_termios.c_cc[VSTART] == CTRL('Q'))
1675 ttydevsw_pktnotify(tp, TIOCPKT_DOSTOP);
1676 else
1677 ttydevsw_pktnotify(tp, TIOCPKT_NOSTOP);
1678 return (0);
1679 }
1680 case TIOCGETD:
1681 /* For compatibility - we only support TTYDISC. */
1682 *(int *)data = TTYDISC;
1683 return (0);
1684 case TIOCGPGRP:
1685 if (!tty_is_ctty(tp, td->td_proc))
1686 return (ENOTTY);
1687
1688 if (tp->t_pgrp != NULL)
1689 *(int *)data = tp->t_pgrp->pg_id;
1690 else
1691 *(int *)data = NO_PID;
1692 return (0);
1693 case TIOCGSID:
1694 if (!tty_is_ctty(tp, td->td_proc))
1695 return (ENOTTY);
1696
1697 MPASS(tp->t_session);
1698 *(int *)data = tp->t_session->s_sid;
1699 return (0);
1700 case TIOCSCTTY: {
1701 struct proc *p = td->td_proc;
1702
1703 /* XXX: This looks awful. */
1704 tty_unlock(tp);
1705 sx_xlock(&proctree_lock);
1706 tty_lock(tp);
1707
1708 if (!SESS_LEADER(p)) {
1709 /* Only the session leader may do this. */
1710 sx_xunlock(&proctree_lock);
1711 return (EPERM);
1712 }
1713
1714 if (tp->t_session != NULL && tp->t_session == p->p_session) {
1715 /* This is already our controlling TTY. */
1716 sx_xunlock(&proctree_lock);
1717 return (0);
1718 }
1719
1720 if (p->p_session->s_ttyp != NULL ||
1721 (tp->t_session != NULL && tp->t_session->s_ttyvp != NULL &&
1722 tp->t_session->s_ttyvp->v_type != VBAD)) {
1723 /*
1724 * There is already a relation between a TTY and
1725 * a session, or the caller is not the session
1726 * leader.
1727 *
1728 * Allow the TTY to be stolen when the vnode is
1729 * invalid, but the reference to the TTY is
1730 * still active. This allows immediate reuse of
1731 * TTYs of which the session leader has been
1732 * killed or the TTY revoked.
1733 */
1734 sx_xunlock(&proctree_lock);
1735 return (EPERM);
1736 }
1737
1738 /* Connect the session to the TTY. */
1739 tp->t_session = p->p_session;
1740 tp->t_session->s_ttyp = tp;
1741 tp->t_sessioncnt++;
1742 sx_xunlock(&proctree_lock);
1743
1744 /* Assign foreground process group. */
1745 tp->t_pgrp = p->p_pgrp;
1746 PROC_LOCK(p);
1747 p->p_flag |= P_CONTROLT;
1748 PROC_UNLOCK(p);
1749
1750 return (0);
1751 }
1752 case TIOCSPGRP: {
1753 struct pgrp *pg;
1754
1755 /*
1756 * XXX: Temporarily unlock the TTY to locate the process
1757 * group. This code would be lot nicer if we would ever
1758 * decompose proctree_lock.
1759 */
1760 tty_unlock(tp);
1761 sx_slock(&proctree_lock);
1762 pg = pgfind(*(int *)data);
1763 if (pg != NULL)
1764 PGRP_UNLOCK(pg);
1765 if (pg == NULL || pg->pg_session != td->td_proc->p_session) {
1766 sx_sunlock(&proctree_lock);
1767 tty_lock(tp);
1768 return (EPERM);
1769 }
1770 tty_lock(tp);
1771
1772 /*
1773 * Determine if this TTY is the controlling TTY after
1774 * relocking the TTY.
1775 */
1776 if (!tty_is_ctty(tp, td->td_proc)) {
1777 sx_sunlock(&proctree_lock);
1778 return (ENOTTY);
1779 }
1780 tp->t_pgrp = pg;
1781 sx_sunlock(&proctree_lock);
1782
1783 /* Wake up the background process groups. */
1784 cv_broadcast(&tp->t_bgwait);
1785 return (0);
1786 }
1787 case TIOCFLUSH: {
1788 int flags = *(int *)data;
1789
1790 if (flags == 0)
1791 flags = (FREAD|FWRITE);
1792 else
1793 flags &= (FREAD|FWRITE);
1794 tty_flush(tp, flags);
1795 return (0);
1796 }
1797 case TIOCDRAIN:
1798 /* Drain TTY output. */
1799 return tty_drain(tp, 0);
1800 case TIOCGDRAINWAIT:
1801 *(int *)data = tp->t_drainwait;
1802 return (0);
1803 case TIOCSDRAINWAIT:
1804 error = priv_check(td, PRIV_TTY_DRAINWAIT);
1805 if (error == 0)
1806 tp->t_drainwait = *(int *)data;
1807 return (error);
1808 case TIOCCONS:
1809 /* Set terminal as console TTY. */
1810 if (*(int *)data) {
1811 error = priv_check(td, PRIV_TTY_CONSOLE);
1812 if (error)
1813 return (error);
1814
1815 /*
1816 * XXX: constty should really need to be locked!
1817 * XXX: allow disconnected constty's to be stolen!
1818 */
1819
1820 if (constty == tp)
1821 return (0);
1822 if (constty != NULL)
1823 return (EBUSY);
1824
1825 tty_unlock(tp);
1826 constty_set(tp);
1827 tty_lock(tp);
1828 } else if (constty == tp) {
1829 constty_clear();
1830 }
1831 return (0);
1832 case TIOCGWINSZ:
1833 /* Obtain window size. */
1834 *(struct winsize*)data = tp->t_winsize;
1835 return (0);
1836 case TIOCSWINSZ:
1837 /* Set window size. */
1838 tty_set_winsize(tp, data);
1839 return (0);
1840 case TIOCEXCL:
1841 tp->t_flags |= TF_EXCLUDE;
1842 return (0);
1843 case TIOCNXCL:
1844 tp->t_flags &= ~TF_EXCLUDE;
1845 return (0);
1846 case TIOCSTOP:
1847 tp->t_flags |= TF_STOPPED;
1848 ttydevsw_pktnotify(tp, TIOCPKT_STOP);
1849 return (0);
1850 case TIOCSTART:
1851 tp->t_flags &= ~TF_STOPPED;
1852 ttydevsw_outwakeup(tp);
1853 ttydevsw_pktnotify(tp, TIOCPKT_START);
1854 return (0);
1855 case TIOCSTAT:
1856 tty_info(tp);
1857 return (0);
1858 case TIOCSTI:
1859 if ((fflag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI))
1860 return (EPERM);
1861 if (!tty_is_ctty(tp, td->td_proc) &&
1862 priv_check(td, PRIV_TTY_STI))
1863 return (EACCES);
1864 ttydisc_rint(tp, *(char *)data, 0);
1865 ttydisc_rint_done(tp);
1866 return (0);
1867 }
1868
1869 #ifdef COMPAT_43TTY
1870 return tty_ioctl_compat(tp, cmd, data, fflag, td);
1871 #else /* !COMPAT_43TTY */
1872 return (ENOIOCTL);
1873 #endif /* COMPAT_43TTY */
1874 }
1875
1876 int
1877 tty_ioctl(struct tty *tp, u_long cmd, void *data, int fflag, struct thread *td)
1878 {
1879 int error;
1880
1881 tty_lock_assert(tp, MA_OWNED);
1882
1883 if (tty_gone(tp))
1884 return (ENXIO);
1885
1886 error = ttydevsw_ioctl(tp, cmd, data, td);
1887 if (error == ENOIOCTL)
1888 error = tty_generic_ioctl(tp, cmd, data, fflag, td);
1889
1890 return (error);
1891 }
1892
1893 dev_t
1894 tty_udev(struct tty *tp)
1895 {
1896
1897 if (tp->t_dev)
1898 return (dev2udev(tp->t_dev));
1899 else
1900 return (NODEV);
1901 }
1902
1903 int
1904 tty_checkoutq(struct tty *tp)
1905 {
1906
1907 /* 256 bytes should be enough to print a log message. */
1908 return (ttyoutq_bytesleft(&tp->t_outq) >= 256);
1909 }
1910
1911 void
1912 tty_hiwat_in_block(struct tty *tp)
1913 {
1914
1915 if ((tp->t_flags & TF_HIWAT_IN) == 0 &&
1916 tp->t_termios.c_iflag & IXOFF &&
1917 tp->t_termios.c_cc[VSTOP] != _POSIX_VDISABLE) {
1918 /*
1919 * Input flow control. Only enter the high watermark when we
1920 * can successfully store the VSTOP character.
1921 */
1922 if (ttyoutq_write_nofrag(&tp->t_outq,
1923 &tp->t_termios.c_cc[VSTOP], 1) == 0)
1924 tp->t_flags |= TF_HIWAT_IN;
1925 } else {
1926 /* No input flow control. */
1927 tp->t_flags |= TF_HIWAT_IN;
1928 }
1929 }
1930
1931 void
1932 tty_hiwat_in_unblock(struct tty *tp)
1933 {
1934
1935 if (tp->t_flags & TF_HIWAT_IN &&
1936 tp->t_termios.c_iflag & IXOFF &&
1937 tp->t_termios.c_cc[VSTART] != _POSIX_VDISABLE) {
1938 /*
1939 * Input flow control. Only leave the high watermark when we
1940 * can successfully store the VSTART character.
1941 */
1942 if (ttyoutq_write_nofrag(&tp->t_outq,
1943 &tp->t_termios.c_cc[VSTART], 1) == 0)
1944 tp->t_flags &= ~TF_HIWAT_IN;
1945 } else {
1946 /* No input flow control. */
1947 tp->t_flags &= ~TF_HIWAT_IN;
1948 }
1949
1950 if (!tty_gone(tp))
1951 ttydevsw_inwakeup(tp);
1952 }
1953
1954 /*
1955 * TTY hooks interface.
1956 */
1957
1958 static int
1959 ttyhook_defrint(struct tty *tp, char c, int flags)
1960 {
1961
1962 if (ttyhook_rint_bypass(tp, &c, 1) != 1)
1963 return (-1);
1964
1965 return (0);
1966 }
1967
1968 int
1969 ttyhook_register(struct tty **rtp, struct proc *p, int fd, struct ttyhook *th,
1970 void *softc)
1971 {
1972 struct tty *tp;
1973 struct file *fp;
1974 struct cdev *dev;
1975 struct cdevsw *cdp;
1976 struct filedesc *fdp;
1977 cap_rights_t rights;
1978 int error, ref;
1979
1980 /* Validate the file descriptor. */
1981 fdp = p->p_fd;
1982 error = fget_unlocked(fdp, fd, cap_rights_init(&rights, CAP_TTYHOOK),
1983 &fp, NULL);
1984 if (error != 0)
1985 return (error);
1986 if (fp->f_ops == &badfileops) {
1987 error = EBADF;
1988 goto done1;
1989 }
1990
1991 /*
1992 * Make sure the vnode is bound to a character device.
1993 * Unlocked check for the vnode type is ok there, because we
1994 * only shall prevent calling devvn_refthread on the file that
1995 * never has been opened over a character device.
1996 */
1997 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VCHR) {
1998 error = EINVAL;
1999 goto done1;
2000 }
2001
2002 /* Make sure it is a TTY. */
2003 cdp = devvn_refthread(fp->f_vnode, &dev, &ref);
2004 if (cdp == NULL) {
2005 error = ENXIO;
2006 goto done1;
2007 }
2008 if (dev != fp->f_data) {
2009 error = ENXIO;
2010 goto done2;
2011 }
2012 if (cdp != &ttydev_cdevsw) {
2013 error = ENOTTY;
2014 goto done2;
2015 }
2016 tp = dev->si_drv1;
2017
2018 /* Try to attach the hook to the TTY. */
2019 error = EBUSY;
2020 tty_lock(tp);
2021 MPASS((tp->t_hook == NULL) == ((tp->t_flags & TF_HOOK) == 0));
2022 if (tp->t_flags & TF_HOOK)
2023 goto done3;
2024
2025 tp->t_flags |= TF_HOOK;
2026 tp->t_hook = th;
2027 tp->t_hooksoftc = softc;
2028 *rtp = tp;
2029 error = 0;
2030
2031 /* Maybe we can switch into bypass mode now. */
2032 ttydisc_optimize(tp);
2033
2034 /* Silently convert rint() calls to rint_bypass() when possible. */
2035 if (!ttyhook_hashook(tp, rint) && ttyhook_hashook(tp, rint_bypass))
2036 th->th_rint = ttyhook_defrint;
2037
2038 done3: tty_unlock(tp);
2039 done2: dev_relthread(dev, ref);
2040 done1: fdrop(fp, curthread);
2041 return (error);
2042 }
2043
2044 void
2045 ttyhook_unregister(struct tty *tp)
2046 {
2047
2048 tty_lock_assert(tp, MA_OWNED);
2049 MPASS(tp->t_flags & TF_HOOK);
2050
2051 /* Disconnect the hook. */
2052 tp->t_flags &= ~TF_HOOK;
2053 tp->t_hook = NULL;
2054
2055 /* Maybe we need to leave bypass mode. */
2056 ttydisc_optimize(tp);
2057
2058 /* Maybe deallocate the TTY as well. */
2059 tty_rel_free(tp);
2060 }
2061
2062 /*
2063 * /dev/console handling.
2064 */
2065
2066 static int
2067 ttyconsdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
2068 {
2069 struct tty *tp;
2070
2071 /* System has no console device. */
2072 if (dev_console_filename == NULL)
2073 return (ENXIO);
2074
2075 /* Look up corresponding TTY by device name. */
2076 sx_slock(&tty_list_sx);
2077 TAILQ_FOREACH(tp, &tty_list, t_list) {
2078 if (strcmp(dev_console_filename, tty_devname(tp)) == 0) {
2079 dev_console->si_drv1 = tp;
2080 break;
2081 }
2082 }
2083 sx_sunlock(&tty_list_sx);
2084
2085 /* System console has no TTY associated. */
2086 if (dev_console->si_drv1 == NULL)
2087 return (ENXIO);
2088
2089 return (ttydev_open(dev, oflags, devtype, td));
2090 }
2091
2092 static int
2093 ttyconsdev_write(struct cdev *dev, struct uio *uio, int ioflag)
2094 {
2095
2096 log_console(uio);
2097
2098 return (ttydev_write(dev, uio, ioflag));
2099 }
2100
2101 /*
2102 * /dev/console is a little different than normal TTY's. When opened,
2103 * it determines which TTY to use. When data gets written to it, it
2104 * will be logged in the kernel message buffer.
2105 */
2106 static struct cdevsw ttyconsdev_cdevsw = {
2107 .d_version = D_VERSION,
2108 .d_open = ttyconsdev_open,
2109 .d_close = ttydev_close,
2110 .d_read = ttydev_read,
2111 .d_write = ttyconsdev_write,
2112 .d_ioctl = ttydev_ioctl,
2113 .d_kqfilter = ttydev_kqfilter,
2114 .d_poll = ttydev_poll,
2115 .d_mmap = ttydev_mmap,
2116 .d_name = "ttyconsdev",
2117 .d_flags = D_TTY,
2118 };
2119
2120 static void
2121 ttyconsdev_init(void *unused __unused)
2122 {
2123
2124 dev_console = make_dev_credf(MAKEDEV_ETERNAL, &ttyconsdev_cdevsw, 0,
2125 NULL, UID_ROOT, GID_WHEEL, 0600, "console");
2126 }
2127
2128 SYSINIT(tty, SI_SUB_DRIVERS, SI_ORDER_FIRST, ttyconsdev_init, NULL);
2129
2130 void
2131 ttyconsdev_select(const char *name)
2132 {
2133
2134 dev_console_filename = name;
2135 }
2136
2137 /*
2138 * Debugging routines.
2139 */
2140
2141 #include "opt_ddb.h"
2142 #ifdef DDB
2143 #include <ddb/ddb.h>
2144 #include <ddb/db_sym.h>
2145
2146 static const struct {
2147 int flag;
2148 char val;
2149 } ttystates[] = {
2150 #if 0
2151 { TF_NOPREFIX, 'N' },
2152 #endif
2153 { TF_INITLOCK, 'I' },
2154 { TF_CALLOUT, 'C' },
2155
2156 /* Keep these together -> 'Oi' and 'Oo'. */
2157 { TF_OPENED, 'O' },
2158 { TF_OPENED_IN, 'i' },
2159 { TF_OPENED_OUT, 'o' },
2160 { TF_OPENED_CONS, 'c' },
2161
2162 { TF_GONE, 'G' },
2163 { TF_OPENCLOSE, 'B' },
2164 { TF_ASYNC, 'Y' },
2165 { TF_LITERAL, 'L' },
2166
2167 /* Keep these together -> 'Hi' and 'Ho'. */
2168 { TF_HIWAT, 'H' },
2169 { TF_HIWAT_IN, 'i' },
2170 { TF_HIWAT_OUT, 'o' },
2171
2172 { TF_STOPPED, 'S' },
2173 { TF_EXCLUDE, 'X' },
2174 { TF_BYPASS, 'l' },
2175 { TF_ZOMBIE, 'Z' },
2176 { TF_HOOK, 's' },
2177
2178 /* Keep these together -> 'bi' and 'bo'. */
2179 { TF_BUSY, 'b' },
2180 { TF_BUSY_IN, 'i' },
2181 { TF_BUSY_OUT, 'o' },
2182
2183 { 0, '\0'},
2184 };
2185
2186 #define TTY_FLAG_BITS \
2187 "\2\1NOPREFIX\2INITLOCK\3CALLOUT\4OPENED_IN" \
2188 "\5OPENED_OUT\6OPENED_CONS\7GONE\10OPENCLOSE" \
2189 "\11ASYNC\12LITERAL\13HIWAT_IN\14HIWAT_OUT" \
2190 "\15STOPPED\16EXCLUDE\17BYPASS\20ZOMBIE" \
2191 "\21HOOK\22BUSY_IN\23BUSY_OUT"
2192
2193 #define DB_PRINTSYM(name, addr) \
2194 db_printf("%s " #name ": ", sep); \
2195 db_printsym((db_addr_t) addr, DB_STGY_ANY); \
2196 db_printf("\n");
2197
2198 static void
2199 _db_show_devsw(const char *sep, const struct ttydevsw *tsw)
2200 {
2201
2202 db_printf("%sdevsw: ", sep);
2203 db_printsym((db_addr_t)tsw, DB_STGY_ANY);
2204 db_printf(" (%p)\n", tsw);
2205 DB_PRINTSYM(open, tsw->tsw_open);
2206 DB_PRINTSYM(close, tsw->tsw_close);
2207 DB_PRINTSYM(outwakeup, tsw->tsw_outwakeup);
2208 DB_PRINTSYM(inwakeup, tsw->tsw_inwakeup);
2209 DB_PRINTSYM(ioctl, tsw->tsw_ioctl);
2210 DB_PRINTSYM(param, tsw->tsw_param);
2211 DB_PRINTSYM(modem, tsw->tsw_modem);
2212 DB_PRINTSYM(mmap, tsw->tsw_mmap);
2213 DB_PRINTSYM(pktnotify, tsw->tsw_pktnotify);
2214 DB_PRINTSYM(free, tsw->tsw_free);
2215 }
2216
2217 static void
2218 _db_show_hooks(const char *sep, const struct ttyhook *th)
2219 {
2220
2221 db_printf("%shook: ", sep);
2222 db_printsym((db_addr_t)th, DB_STGY_ANY);
2223 db_printf(" (%p)\n", th);
2224 if (th == NULL)
2225 return;
2226 DB_PRINTSYM(rint, th->th_rint);
2227 DB_PRINTSYM(rint_bypass, th->th_rint_bypass);
2228 DB_PRINTSYM(rint_done, th->th_rint_done);
2229 DB_PRINTSYM(rint_poll, th->th_rint_poll);
2230 DB_PRINTSYM(getc_inject, th->th_getc_inject);
2231 DB_PRINTSYM(getc_capture, th->th_getc_capture);
2232 DB_PRINTSYM(getc_poll, th->th_getc_poll);
2233 DB_PRINTSYM(close, th->th_close);
2234 }
2235
2236 static void
2237 _db_show_termios(const char *name, const struct termios *t)
2238 {
2239
2240 db_printf("%s: iflag 0x%x oflag 0x%x cflag 0x%x "
2241 "lflag 0x%x ispeed %u ospeed %u\n", name,
2242 t->c_iflag, t->c_oflag, t->c_cflag, t->c_lflag,
2243 t->c_ispeed, t->c_ospeed);
2244 }
2245
2246 /* DDB command to show TTY statistics. */
2247 DB_SHOW_COMMAND(tty, db_show_tty)
2248 {
2249 struct tty *tp;
2250
2251 if (!have_addr) {
2252 db_printf("usage: show tty <addr>\n");
2253 return;
2254 }
2255 tp = (struct tty *)addr;
2256
2257 db_printf("%p: %s\n", tp, tty_devname(tp));
2258 db_printf("\tmtx: %p\n", tp->t_mtx);
2259 db_printf("\tflags: 0x%b\n", tp->t_flags, TTY_FLAG_BITS);
2260 db_printf("\trevokecnt: %u\n", tp->t_revokecnt);
2261
2262 /* Buffering mechanisms. */
2263 db_printf("\tinq: %p begin %u linestart %u reprint %u end %u "
2264 "nblocks %u quota %u\n", &tp->t_inq, tp->t_inq.ti_begin,
2265 tp->t_inq.ti_linestart, tp->t_inq.ti_reprint, tp->t_inq.ti_end,
2266 tp->t_inq.ti_nblocks, tp->t_inq.ti_quota);
2267 db_printf("\toutq: %p begin %u end %u nblocks %u quota %u\n",
2268 &tp->t_outq, tp->t_outq.to_begin, tp->t_outq.to_end,
2269 tp->t_outq.to_nblocks, tp->t_outq.to_quota);
2270 db_printf("\tinlow: %zu\n", tp->t_inlow);
2271 db_printf("\toutlow: %zu\n", tp->t_outlow);
2272 _db_show_termios("\ttermios", &tp->t_termios);
2273 db_printf("\twinsize: row %u col %u xpixel %u ypixel %u\n",
2274 tp->t_winsize.ws_row, tp->t_winsize.ws_col,
2275 tp->t_winsize.ws_xpixel, tp->t_winsize.ws_ypixel);
2276 db_printf("\tcolumn: %u\n", tp->t_column);
2277 db_printf("\twritepos: %u\n", tp->t_writepos);
2278 db_printf("\tcompatflags: 0x%x\n", tp->t_compatflags);
2279
2280 /* Init/lock-state devices. */
2281 _db_show_termios("\ttermios_init_in", &tp->t_termios_init_in);
2282 _db_show_termios("\ttermios_init_out", &tp->t_termios_init_out);
2283 _db_show_termios("\ttermios_lock_in", &tp->t_termios_lock_in);
2284 _db_show_termios("\ttermios_lock_out", &tp->t_termios_lock_out);
2285
2286 /* Hooks */
2287 _db_show_devsw("\t", tp->t_devsw);
2288 _db_show_hooks("\t", tp->t_hook);
2289
2290 /* Process info. */
2291 db_printf("\tpgrp: %p gid %d jobc %d\n", tp->t_pgrp,
2292 tp->t_pgrp ? tp->t_pgrp->pg_id : 0,
2293 tp->t_pgrp ? tp->t_pgrp->pg_jobc : 0);
2294 db_printf("\tsession: %p", tp->t_session);
2295 if (tp->t_session != NULL)
2296 db_printf(" count %u leader %p tty %p sid %d login %s",
2297 tp->t_session->s_count, tp->t_session->s_leader,
2298 tp->t_session->s_ttyp, tp->t_session->s_sid,
2299 tp->t_session->s_login);
2300 db_printf("\n");
2301 db_printf("\tsessioncnt: %u\n", tp->t_sessioncnt);
2302 db_printf("\tdevswsoftc: %p\n", tp->t_devswsoftc);
2303 db_printf("\thooksoftc: %p\n", tp->t_hooksoftc);
2304 db_printf("\tdev: %p\n", tp->t_dev);
2305 }
2306
2307 /* DDB command to list TTYs. */
2308 DB_SHOW_ALL_COMMAND(ttys, db_show_all_ttys)
2309 {
2310 struct tty *tp;
2311 size_t isiz, osiz;
2312 int i, j;
2313
2314 /* Make the output look like `pstat -t'. */
2315 db_printf("PTR ");
2316 #if defined(__LP64__)
2317 db_printf(" ");
2318 #endif
2319 db_printf(" LINE INQ CAN LIN LOW OUTQ USE LOW "
2320 "COL SESS PGID STATE\n");
2321
2322 TAILQ_FOREACH(tp, &tty_list, t_list) {
2323 isiz = tp->t_inq.ti_nblocks * TTYINQ_DATASIZE;
2324 osiz = tp->t_outq.to_nblocks * TTYOUTQ_DATASIZE;
2325
2326 db_printf("%p %10s %5zu %4u %4u %4zu %5zu %4u %4zu %5u %5d "
2327 "%5d ", tp, tty_devname(tp), isiz,
2328 tp->t_inq.ti_linestart - tp->t_inq.ti_begin,
2329 tp->t_inq.ti_end - tp->t_inq.ti_linestart,
2330 isiz - tp->t_inlow, osiz,
2331 tp->t_outq.to_end - tp->t_outq.to_begin,
2332 osiz - tp->t_outlow, MIN(tp->t_column, 99999),
2333 tp->t_session ? tp->t_session->s_sid : 0,
2334 tp->t_pgrp ? tp->t_pgrp->pg_id : 0);
2335
2336 /* Flag bits. */
2337 for (i = j = 0; ttystates[i].flag; i++)
2338 if (tp->t_flags & ttystates[i].flag) {
2339 db_printf("%c", ttystates[i].val);
2340 j++;
2341 }
2342 if (j == 0)
2343 db_printf("-");
2344 db_printf("\n");
2345 }
2346 }
2347 #endif /* DDB */
Cache object: 7e75a410ce26a198c8e93b57a2ece630
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