1/*-
2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: head/sys/kern/tty_pty.c 154833 2006-01-26 01:30:34Z cognet $");
34
35/*
36 * Pseudo-teletype Driver
37 * (Actually two drivers, requiring two entries in 'cdevsw')
38 */
39#include "opt_compat.h"
40#include "opt_tty.h"
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/lock.h>
44#include <sys/mutex.h>
45#include <sys/sx.h>
46#if defined(COMPAT_43TTY)
47#include <sys/ioctl_compat.h>
48#endif
49#include <sys/proc.h>
50#include <sys/tty.h>
51#include <sys/conf.h>
52#include <sys/fcntl.h>
53#include <sys/poll.h>
54#include <sys/kernel.h>
55#include <sys/uio.h>
56#include <sys/signalvar.h>
57#include <sys/malloc.h>
58
59static MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
60
61static void ptsstart(struct tty *tp);
62static void ptsstop(struct tty *tp, int rw);
63static void ptcwakeup(struct tty *tp, int flag);
64static struct cdev *ptyinit(struct cdev *cdev, struct thread *td);
65
66static d_open_t ptsopen;
67static d_close_t ptsclose;
68static d_read_t ptsread;
69static d_write_t ptswrite;
70static d_ioctl_t ptsioctl;
71static d_open_t ptcopen;
72static d_close_t ptcclose;
73static d_read_t ptcread;
74static d_ioctl_t ptcioctl;
75static d_write_t ptcwrite;
76static d_poll_t ptcpoll;
77
78static struct cdevsw pts_cdevsw = {
79 .d_version = D_VERSION,
80 .d_open = ptsopen,
81 .d_close = ptsclose,
82 .d_read = ptsread,
83 .d_write = ptswrite,
84 .d_ioctl = ptsioctl,
85 .d_name = "pts",
86 .d_flags = D_TTY | D_NEEDGIANT,
87};
88
89static struct cdevsw ptc_cdevsw = {
90 .d_version = D_VERSION,
91 .d_open = ptcopen,
92 .d_close = ptcclose,
93 .d_read = ptcread,
94 .d_write = ptcwrite,
95 .d_ioctl = ptcioctl,
96 .d_poll = ptcpoll,
97 .d_name = "ptc",
98 .d_flags = D_TTY | D_NEEDGIANT,
99};
100
101#define BUFSIZ 100 /* Chunk size iomoved to/from user */
102
103struct ptsc {
104 int pt_flags;
105 struct selinfo pt_selr, pt_selw;
106 u_char pt_send;
107 u_char pt_ucntl;
108 struct tty *pt_tty;
109 struct cdev *devs, *devc;
110 int pt_devs_open, pt_devc_open;
111 struct prison *pt_prison;
112};
113
114#define PF_PKT 0x08 /* packet mode */
115#define PF_STOPPED 0x10 /* user told stopped */
116#define PF_NOSTOP 0x40
117#define PF_UCNTL 0x80 /* user control mode */
118
119#define TSA_PTC_READ(tp) ((void *)&(tp)->t_outq.c_cf)
120#define TSA_PTC_WRITE(tp) ((void *)&(tp)->t_rawq.c_cl)
121#define TSA_PTS_READ(tp) ((void *)&(tp)->t_canq)
122
123static char *names = "pqrsPQRS";
124/*
125 * This function creates and initializes a pts/ptc pair
126 *
127 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
128 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
129 *
130 * XXX: define and add mapping of upper minor bits to allow more
131 * than 256 ptys.
132 */
133static struct cdev *
134ptyinit(struct cdev *devc, struct thread *td)
135{
136 struct ptsc *pt;
137 int n;
138
139 n = minor(devc);
140 /* For now we only map the lower 8 bits of the minor */
141 if (n & ~0xff)
142 return (NULL);
143
144 devc->si_flags &= ~SI_CHEAPCLONE;
145
146 /*
147 * Initially do not create a slave endpoint.
148 */
149 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
150 pt->devc = devc;
151
152 pt->pt_tty = ttyalloc();
153 pt->pt_tty->t_sc = pt;
154 devc->si_drv1 = pt;
155 devc->si_tty = pt->pt_tty;
156 return (devc);
157}
158
159static void
160pty_create_slave(struct ucred *cred, struct ptsc *pt, int n)
161{
162
163 pt->devs = make_dev_cred(&pts_cdevsw, n, cred, UID_ROOT, GID_WHEEL,
164 0666, "tty%c%r", names[n / 32], n % 32);
165 pt->devs->si_drv1 = pt;
166 pt->devs->si_tty = pt->pt_tty;
167 pt->pt_tty->t_dev = pt->devs;
168}
169
170static void
171pty_destroy_slave(struct ptsc *pt)
172{
173
174 pt->pt_tty->t_dev = NULL;
175 destroy_dev(pt->devs);
176 pt->devs = NULL;
177}
178
179static void
180pty_maybe_destroy_slave(struct ptsc *pt)
181{
182
183 if (pt->pt_devc_open == 0 && pt->pt_devs_open == 0)
184 pty_destroy_slave(pt);
185}
186
187/*ARGSUSED*/
188static int
189ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td)
190{
191 struct tty *tp;
192 int error;
193 struct ptsc *pt;
194
195 if (!dev->si_drv1)
196 return(ENXIO);
197 pt = dev->si_drv1;
198 tp = dev->si_tty;
199 if ((tp->t_state & TS_ISOPEN) == 0) {
200 ttyinitmode(tp, 1, 0);
201 } else if (tp->t_state & TS_XCLUDE && suser(td))
202 return (EBUSY);
203 else if (pt->pt_prison != td->td_ucred->cr_prison)
204 return (EBUSY);
205 if (tp->t_oproc) /* Ctrlr still around. */
206 (void)ttyld_modem(tp, 1);
207 while ((tp->t_state & TS_CARR_ON) == 0) {
208 if (flag&FNONBLOCK)
209 break;
210 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
211 "ptsopn", 0);
212 if (error)
213 return (error);
214 }
215 error = ttyld_open(tp, dev);
216 if (error == 0) {
217 ptcwakeup(tp, FREAD|FWRITE);
218 pt->pt_devs_open = 1;
219 } else
220 pty_maybe_destroy_slave(pt);
221 return (error);
222}
223
224static int
225ptsclose(struct cdev *dev, int flag, int mode, struct thread *td)
226{
227 struct ptsc *pti;
228 struct tty *tp;
229 int err;
230
231 tp = dev->si_tty;
232 pti = dev->si_drv1;
233
234 KASSERT(dev == pti->devs, ("ptsclose: dev != pti->devs"));
235
236 err = ttyld_close(tp, flag);
237 (void) tty_close(tp);
238
239 pti->pt_devs_open = 0;
240 pty_maybe_destroy_slave(pti);
241
242 return (err);
243}
244
245static int
246ptsread(struct cdev *dev, struct uio *uio, int flag)
247{
248 struct tty *tp = dev->si_tty;
249 int error = 0;
250
251 if (tp->t_oproc)
252 error = ttyld_read(tp, uio, flag);
253 ptcwakeup(tp, FWRITE);
254 return (error);
255}
256
257/*
258 * Write to pseudo-tty.
259 * Wakeups of controlling tty will happen
260 * indirectly, when tty driver calls ptsstart.
261 */
262static int
263ptswrite(struct cdev *dev, struct uio *uio, int flag)
264{
265 struct tty *tp;
266
267 tp = dev->si_tty;
268 if (tp->t_oproc == 0)
269 return (EIO);
270 return (ttyld_write(tp, uio, flag));
271}
272
273/*
274 * Start output on pseudo-tty.
275 * Wake up process selecting or sleeping for input from controlling tty.
276 */
277static void
278ptsstart(struct tty *tp)
279{
280 struct ptsc *pt = tp->t_sc;
281
282 if (tp->t_state & TS_TTSTOP)
283 return;
284 if (pt->pt_flags & PF_STOPPED) {
285 pt->pt_flags &= ~PF_STOPPED;
286 pt->pt_send = TIOCPKT_START;
287 }
288 ptcwakeup(tp, FREAD);
289}
290
291static void
292ptcwakeup(struct tty *tp, int flag)
293{
294 struct ptsc *pt = tp->t_sc;
295
296 if (flag & FREAD) {
297 selwakeuppri(&pt->pt_selr, TTIPRI);
298 wakeup(TSA_PTC_READ(tp));
299 }
300 if (flag & FWRITE) {
301 selwakeuppri(&pt->pt_selw, TTOPRI);
302 wakeup(TSA_PTC_WRITE(tp));
303 }
304}
305
306static int
307ptcopen(struct cdev *dev, int flag, int devtype, struct thread *td)
308{
309 struct tty *tp;
310 struct ptsc *pt;
311
312 if (!dev->si_drv1)
313 ptyinit(dev, td);
314 if (!dev->si_drv1)
315 return(ENXIO);
316 tp = dev->si_tty;
317 if (tp->t_oproc)
318 return (EIO);
319 tp->t_timeout = -1;
320 tp->t_oproc = ptsstart;
321 tp->t_stop = ptsstop;
322 (void)ttyld_modem(tp, 1);
323 tp->t_lflag &= ~EXTPROC;
324 pt = dev->si_drv1;
325 pt->pt_prison = td->td_ucred->cr_prison;
326 pt->pt_flags = 0;
327 pt->pt_send = 0;
328 pt->pt_ucntl = 0;
329
330 pty_create_slave(td->td_ucred, pt, minor(dev));
331 pt->pt_devc_open = 1;
332
333 return (0);
334}
335
336static int
337ptcclose(struct cdev *dev, int flags, int fmt, struct thread *td)
338{
339 struct ptsc *pti = dev->si_drv1;
340 struct tty *tp;
341
342 tp = dev->si_tty;
343 (void)ttyld_modem(tp, 0);
344
345 /*
346 * XXX MDMBUF makes no sense for ptys but would inhibit the above
347 * l_modem(). CLOCAL makes sense but isn't supported. Special
348 * l_modem()s that ignore carrier drop make no sense for ptys but
349 * may be in use because other parts of the line discipline make
350 * sense for ptys. Recover by doing everything that a normal
351 * ttymodem() would have done except for sending a SIGHUP.
352 */
353 if (tp->t_state & TS_ISOPEN) {
354 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
355 tp->t_state |= TS_ZOMBIE;
356 ttyflush(tp, FREAD | FWRITE);
357 }
358
359 tp->t_oproc = 0; /* mark closed */
360 pti->pt_devc_open = 0;
361 pty_maybe_destroy_slave(pti);
362 return (0);
363}
364
365static int
366ptcread(struct cdev *dev, struct uio *uio, int flag)
367{
368 struct tty *tp = dev->si_tty;
369 struct ptsc *pt = dev->si_drv1;
370 char buf[BUFSIZ];
371 int error = 0, cc;
372
373 /*
374 * We want to block until the slave
375 * is open, and there's something to read;
376 * but if we lost the slave or we're NBIO,
377 * then return the appropriate error instead.
378 */
379 for (;;) {
380 if (tp->t_state&TS_ISOPEN) {
381 if (pt->pt_flags&PF_PKT && pt->pt_send) {
382 error = ureadc((int)pt->pt_send, uio);
383 if (error)
384 return (error);
385 if (pt->pt_send & TIOCPKT_IOCTL) {
386 cc = min(uio->uio_resid,
387 sizeof(tp->t_termios));
388 uiomove(&tp->t_termios, cc, uio);
389 }
390 pt->pt_send = 0;
391 return (0);
392 }
393 if (pt->pt_flags&PF_UCNTL && pt->pt_ucntl) {
394 error = ureadc((int)pt->pt_ucntl, uio);
395 if (error)
396 return (error);
397 pt->pt_ucntl = 0;
398 return (0);
399 }
400 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
401 break;
402 }
403 if ((tp->t_state & TS_CONNECTED) == 0)
404 return (0); /* EOF */
405 if (flag & O_NONBLOCK)
406 return (EWOULDBLOCK);
407 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0);
408 if (error)
409 return (error);
410 }
411 if (pt->pt_flags & (PF_PKT|PF_UCNTL))
412 error = ureadc(0, uio);
413 while (uio->uio_resid > 0 && error == 0) {
414 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
415 if (cc <= 0)
416 break;
417 error = uiomove(buf, cc, uio);
418 }
419 ttwwakeup(tp);
420 return (error);
421}
422
423static void
424ptsstop(struct tty *tp, int flush)
425{
426 struct ptsc *pt = tp->t_sc;
427 int flag;
428
429 /* note: FLUSHREAD and FLUSHWRITE already ok */
430 if (flush == 0) {
431 flush = TIOCPKT_STOP;
432 pt->pt_flags |= PF_STOPPED;
433 } else
434 pt->pt_flags &= ~PF_STOPPED;
435 pt->pt_send |= flush;
436 /* change of perspective */
437 flag = 0;
438 if (flush & FREAD)
439 flag |= FWRITE;
440 if (flush & FWRITE)
441 flag |= FREAD;
442 ptcwakeup(tp, flag);
443}
444
445static int
446ptcpoll(struct cdev *dev, int events, struct thread *td)
447{
448 struct tty *tp = dev->si_tty;
449 struct ptsc *pt = dev->si_drv1;
450 int revents = 0;
451 int s;
452
453 if ((tp->t_state & TS_CONNECTED) == 0)
454 return (events &
455 (POLLHUP | POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM));
456
457 /*
458 * Need to block timeouts (ttrstart).
459 */
460 s = spltty();
461
462 if (events & (POLLIN | POLLRDNORM))
463 if ((tp->t_state & TS_ISOPEN) &&
464 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
465 ((pt->pt_flags & PF_PKT) && pt->pt_send) ||
466 ((pt->pt_flags & PF_UCNTL) && pt->pt_ucntl)))
467 revents |= events & (POLLIN | POLLRDNORM);
468
469 if (events & (POLLOUT | POLLWRNORM))
470 if (tp->t_state & TS_ISOPEN &&
471 (((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
472 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
473 revents |= events & (POLLOUT | POLLWRNORM);
474
475 if (events & POLLHUP)
476 if ((tp->t_state & TS_CARR_ON) == 0)
477 revents |= POLLHUP;
478
479 if (revents == 0) {
480 if (events & (POLLIN | POLLRDNORM))
481 selrecord(td, &pt->pt_selr);
482
483 if (events & (POLLOUT | POLLWRNORM))
484 selrecord(td, &pt->pt_selw);
485 }
486 splx(s);
487
488 return (revents);
489}
490
491static int
492ptcwrite(struct cdev *dev, struct uio *uio, int flag)
493{
494 struct tty *tp = dev->si_tty;
495 u_char *cp = 0;
496 int cc = 0;
497 u_char locbuf[BUFSIZ];
498 int cnt = 0;
499 int error = 0;
500
501again:
502 if ((tp->t_state&TS_ISOPEN) == 0)
503 goto block;
504 while (uio->uio_resid > 0 || cc > 0) {
505 if (cc == 0) {
506 cc = min(uio->uio_resid, BUFSIZ);
507 cp = locbuf;
508 error = uiomove(cp, cc, uio);
509 if (error)
510 return (error);
511 /* check again for safety */
512 if ((tp->t_state & TS_ISOPEN) == 0) {
513 /* adjust for data copied in but not written */
514 uio->uio_resid += cc;
515 return (EIO);
516 }
517 }
518 while (cc > 0) {
519 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
520 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
521 wakeup(TSA_HUP_OR_INPUT(tp));
522 goto block;
523 }
524 ttyld_rint(tp, *cp++);
525 cnt++;
526 cc--;
527 }
528 cc = 0;
529 }
530 return (0);
531block:
532 /*
533 * Come here to wait for slave to open, for space
534 * in outq, or space in rawq, or an empty canq.
535 */
536 if ((tp->t_state & TS_CONNECTED) == 0) {
537 /* adjust for data copied in but not written */
538 uio->uio_resid += cc;
539 return (EIO);
540 }
541 if (flag & O_NONBLOCK) {
542 /* adjust for data copied in but not written */
543 uio->uio_resid += cc;
544 if (cnt == 0)
545 return (EWOULDBLOCK);
546 return (0);
547 }
548 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0);
549 if (error) {
550 /* adjust for data copied in but not written */
551 uio->uio_resid += cc;
552 return (error);
553 }
554 goto again;
555}
556
557/*ARGSUSED*/
558static int
559ptcioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
560{
561 struct tty *tp = dev->si_tty;
562 struct ptsc *pt = dev->si_drv1;
563
564 switch (cmd) {
565
566 case TIOCGPGRP:
567 /*
568 * We avoid calling ttioctl on the controller since,
569 * in that case, tp must be the controlling terminal.
570 */
571 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
572 return (0);
573
574 case TIOCPKT:
575 if (*(int *)data) {
576 if (pt->pt_flags & PF_UCNTL)
577 return (EINVAL);
578 pt->pt_flags |= PF_PKT;
579 } else
580 pt->pt_flags &= ~PF_PKT;
581 return (0);
582
583 case TIOCUCNTL:
584 if (*(int *)data) {
585 if (pt->pt_flags & PF_PKT)
586 return (EINVAL);
587 pt->pt_flags |= PF_UCNTL;
588 } else
589 pt->pt_flags &= ~PF_UCNTL;
590 return (0);
591 }
592
593 /*
594 * The rest of the ioctls shouldn't be called until
595 * the slave is open.
596 */
597 if ((tp->t_state & TS_ISOPEN) == 0)
598 return (EAGAIN);
599
600 switch (cmd) {
601#ifdef COMPAT_43TTY
602 case TIOCSETP:
603 case TIOCSETN:
604#endif
605 case TIOCSETD:
606 case TIOCSETA:
607 case TIOCSETAW:
608 case TIOCSETAF:
609 /*
610 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
611 * ttywflush(tp) will hang if there are characters in
612 * the outq.
613 */
614 ndflush(&tp->t_outq, tp->t_outq.c_cc);
615 break;
616
617 case TIOCSIG:
618 if (*(unsigned int *)data >= NSIG ||
619 *(unsigned int *)data == 0)
620 return(EINVAL);
621 if ((tp->t_lflag&NOFLSH) == 0)
622 ttyflush(tp, FREAD|FWRITE);
623 if (tp->t_pgrp != NULL) {
624 PGRP_LOCK(tp->t_pgrp);
625 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
626 PGRP_UNLOCK(tp->t_pgrp);
627 }
628 if ((*(unsigned int *)data == SIGINFO) &&
629 ((tp->t_lflag&NOKERNINFO) == 0))
630 ttyinfo(tp);
631 return(0);
632 }
633
634 return (ptsioctl(dev, cmd, data, flag, td));
635}
636
637/*ARGSUSED*/
638static int
639ptsioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
640{
641 struct tty *tp = dev->si_tty;
642 struct ptsc *pt = dev->si_drv1;
643 u_char *cc = tp->t_cc;
644 int stop, error;
645
646 if (cmd == TIOCEXT) {
647 /*
648 * When the EXTPROC bit is being toggled, we need
649 * to send an TIOCPKT_IOCTL if the packet driver
650 * is turned on.
651 */
652 if (*(int *)data) {
653 if (pt->pt_flags & PF_PKT) {
654 pt->pt_send |= TIOCPKT_IOCTL;
655 ptcwakeup(tp, FREAD);
656 }
657 tp->t_lflag |= EXTPROC;
658 } else {
659 if ((tp->t_lflag & EXTPROC) &&
660 (pt->pt_flags & PF_PKT)) {
661 pt->pt_send |= TIOCPKT_IOCTL;
662 ptcwakeup(tp, FREAD);
663 }
664 tp->t_lflag &= ~EXTPROC;
665 }
666 return(0);
667 }
668 error = ttyioctl(dev, cmd, data, flag, td);
669 if (error == ENOTTY) {
670 if (pt->pt_flags & PF_UCNTL &&
671 (cmd & ~0xff) == UIOCCMD(0)) {
672 if (cmd & 0xff) {
673 pt->pt_ucntl = (u_char)cmd;
674 ptcwakeup(tp, FREAD);
675 }
676 return (0);
677 }
678 error = ENOTTY;
679 }
680 /*
681 * If external processing and packet mode send ioctl packet.
682 */
683 if ((tp->t_lflag&EXTPROC) && (pt->pt_flags & PF_PKT)) {
684 switch(cmd) {
685 case TIOCSETA:
686 case TIOCSETAW:
687 case TIOCSETAF:
688#ifdef COMPAT_43TTY
689 case TIOCSETP:
690 case TIOCSETN:
691 case TIOCSETC:
692 case TIOCSLTC:
693 case TIOCLBIS:
694 case TIOCLBIC:
695 case TIOCLSET:
696#endif
697 pt->pt_send |= TIOCPKT_IOCTL;
698 ptcwakeup(tp, FREAD);
699 break;
700 default:
701 break;
702 }
703 }
704 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
705 && CCEQ(cc[VSTART], CTRL('q'));
706 if (pt->pt_flags & PF_NOSTOP) {
707 if (stop) {
708 pt->pt_send &= ~TIOCPKT_NOSTOP;
709 pt->pt_send |= TIOCPKT_DOSTOP;
710 pt->pt_flags &= ~PF_NOSTOP;
711 ptcwakeup(tp, FREAD);
712 }
713 } else {
714 if (!stop) {
715 pt->pt_send &= ~TIOCPKT_DOSTOP;
716 pt->pt_send |= TIOCPKT_NOSTOP;
717 pt->pt_flags |= PF_NOSTOP;
718 ptcwakeup(tp, FREAD);
719 }
720 }
721 return (error);
722}
723
724static void
725pty_clone(void *arg, struct ucred *cr, char *name, int namelen,
726 struct cdev **dev)
727{
728 int u;
729
730 if (*dev != NULL)
731 return;
732 if (bcmp(name, "pty", 3) != 0)
733 return;
734 if (name[5] != '\0')
735 return;
736 switch (name[3]) {
737 case 'p': u = 0; break;
738 case 'q': u = 32; break;
739 case 'r': u = 64; break;
740 case 's': u = 96; break;
741 case 'P': u = 128; break;
742 case 'Q': u = 160; break;
743 case 'R': u = 192; break;
744 case 'S': u = 224; break;
745 default: return;
746 }
747 if (name[4] >= '0' && name[4] <= '9')
748 u += name[4] - '0';
749 else if (name[4] >= 'a' && name[4] <= 'v')
750 u += name[4] - 'a' + 10;
751 else
752 return;
753 *dev = make_dev_cred(&ptc_cdevsw, u, cr,
754 UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32);
755 dev_ref(*dev);
756 (*dev)->si_flags |= SI_CHEAPCLONE;
757 return;
758}
759
760static void
761ptc_drvinit(void *unused)
762{
763
764 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000);
765}
766
767SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,ptc_drvinit,NULL)