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 154170 2006-01-10 09:19:10Z phk $");
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 struct prison *pt_prison;
111};
112
113#define PF_PKT 0x08 /* packet mode */
114#define PF_STOPPED 0x10 /* user told stopped */
115#define PF_NOSTOP 0x40
116#define PF_UCNTL 0x80 /* user control mode */
117
118#define TSA_PTC_READ(tp) ((void *)&(tp)->t_outq.c_cf)
119#define TSA_PTC_WRITE(tp) ((void *)&(tp)->t_rawq.c_cl)
120#define TSA_PTS_READ(tp) ((void *)&(tp)->t_canq)
121
122static char *names = "pqrsPQRS";
123/*
124 * This function creates and initializes a pts/ptc pair
125 *
126 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
127 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
128 *
129 * XXX: define and add mapping of upper minor bits to allow more
130 * than 256 ptys.
131 */
132static struct cdev *
133ptyinit(struct cdev *devc, struct thread *td)
134{
135 struct cdev *devs;
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 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
147 pt->devs = devs = make_dev_cred(&pts_cdevsw, n, td->td_ucred,
148 UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32);
149 pt->devc = devc;
150
151 pt->pt_tty = ttyalloc();
152 pt->pt_tty->t_sc = pt;
153 devs->si_drv1 = devc->si_drv1 = pt;
154 devs->si_tty = devc->si_tty = pt->pt_tty;
155 pt->pt_tty->t_dev = devs;
156 return (devc);
157}
158
159/*ARGSUSED*/
160static int
161ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td)
162{
163 struct tty *tp;
164 int error;
165 struct ptsc *pt;
166
167 if (!dev->si_drv1)
168 return(ENXIO);
169 pt = dev->si_drv1;
170 tp = dev->si_tty;
171 if ((tp->t_state & TS_ISOPEN) == 0) {
172 ttyinitmode(tp, 1, 0);
173 } else if (tp->t_state & TS_XCLUDE && suser(td))
174 return (EBUSY);
175 else if (pt->pt_prison != td->td_ucred->cr_prison)
176 return (EBUSY);
177 if (tp->t_oproc) /* Ctrlr still around. */
178 (void)ttyld_modem(tp, 1);
179 while ((tp->t_state & TS_CARR_ON) == 0) {
180 if (flag&FNONBLOCK)
181 break;
182 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
183 "ptsopn", 0);
184 if (error)
185 return (error);
186 }
187 error = ttyld_open(tp, dev);
188 if (error == 0)
189 ptcwakeup(tp, FREAD|FWRITE);
190 return (error);
191}
192
193static int
194ptsclose(struct cdev *dev, int flag, int mode, struct thread *td)
195{
196 struct tty *tp;
197 int err;
198
199 tp = dev->si_tty;
200 err = ttyld_close(tp, flag);
201 (void) tty_close(tp);
202 return (err);
203}
204
205static int
206ptsread(struct cdev *dev, struct uio *uio, int flag)
207{
208 struct tty *tp = dev->si_tty;
209 int error = 0;
210
211 if (tp->t_oproc)
212 error = ttyld_read(tp, uio, flag);
213 ptcwakeup(tp, FWRITE);
214 return (error);
215}
216
217/*
218 * Write to pseudo-tty.
219 * Wakeups of controlling tty will happen
220 * indirectly, when tty driver calls ptsstart.
221 */
222static int
223ptswrite(struct cdev *dev, struct uio *uio, int flag)
224{
225 struct tty *tp;
226
227 tp = dev->si_tty;
228 if (tp->t_oproc == 0)
229 return (EIO);
230 return (ttyld_write(tp, uio, flag));
231}
232
233/*
234 * Start output on pseudo-tty.
235 * Wake up process selecting or sleeping for input from controlling tty.
236 */
237static void
238ptsstart(struct tty *tp)
239{
240 struct ptsc *pt = tp->t_sc;
241
242 if (tp->t_state & TS_TTSTOP)
243 return;
244 if (pt->pt_flags & PF_STOPPED) {
245 pt->pt_flags &= ~PF_STOPPED;
246 pt->pt_send = TIOCPKT_START;
247 }
248 ptcwakeup(tp, FREAD);
249}
250
251static void
252ptcwakeup(struct tty *tp, int flag)
253{
254 struct ptsc *pt = tp->t_sc;
255
256 if (flag & FREAD) {
257 selwakeuppri(&pt->pt_selr, TTIPRI);
258 wakeup(TSA_PTC_READ(tp));
259 }
260 if (flag & FWRITE) {
261 selwakeuppri(&pt->pt_selw, TTOPRI);
262 wakeup(TSA_PTC_WRITE(tp));
263 }
264}
265
266static int
267ptcopen(struct cdev *dev, int flag, int devtype, struct thread *td)
268{
269 struct tty *tp;
270 struct ptsc *pt;
271
272 if (!dev->si_drv1)
273 ptyinit(dev, td);
274 if (!dev->si_drv1)
275 return(ENXIO);
276 tp = dev->si_tty;
277 if (tp->t_oproc)
278 return (EIO);
279 tp->t_timeout = -1;
280 tp->t_oproc = ptsstart;
281 tp->t_stop = ptsstop;
282 (void)ttyld_modem(tp, 1);
283 tp->t_lflag &= ~EXTPROC;
284 pt = dev->si_drv1;
285 pt->pt_prison = td->td_ucred->cr_prison;
286 pt->pt_flags = 0;
287 pt->pt_send = 0;
288 pt->pt_ucntl = 0;
289 return (0);
290}
291
292static int
293ptcclose(struct cdev *dev, int flags, int fmt, struct thread *td)
294{
295 struct tty *tp;
296
297 tp = dev->si_tty;
298 (void)ttyld_modem(tp, 0);
299
300 /*
301 * XXX MDMBUF makes no sense for ptys but would inhibit the above
302 * l_modem(). CLOCAL makes sense but isn't supported. Special
303 * l_modem()s that ignore carrier drop make no sense for ptys but
304 * may be in use because other parts of the line discipline make
305 * sense for ptys. Recover by doing everything that a normal
306 * ttymodem() would have done except for sending a SIGHUP.
307 */
308 if (tp->t_state & TS_ISOPEN) {
309 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
310 tp->t_state |= TS_ZOMBIE;
311 ttyflush(tp, FREAD | FWRITE);
312 }
313
314 tp->t_oproc = 0; /* mark closed */
315 return (0);
316}
317
318static int
319ptcread(struct cdev *dev, struct uio *uio, int flag)
320{
321 struct tty *tp = dev->si_tty;
322 struct ptsc *pt = dev->si_drv1;
323 char buf[BUFSIZ];
324 int error = 0, cc;
325
326 /*
327 * We want to block until the slave
328 * is open, and there's something to read;
329 * but if we lost the slave or we're NBIO,
330 * then return the appropriate error instead.
331 */
332 for (;;) {
333 if (tp->t_state&TS_ISOPEN) {
334 if (pt->pt_flags&PF_PKT && pt->pt_send) {
335 error = ureadc((int)pt->pt_send, uio);
336 if (error)
337 return (error);
338 if (pt->pt_send & TIOCPKT_IOCTL) {
339 cc = min(uio->uio_resid,
340 sizeof(tp->t_termios));
341 uiomove(&tp->t_termios, cc, uio);
342 }
343 pt->pt_send = 0;
344 return (0);
345 }
346 if (pt->pt_flags&PF_UCNTL && pt->pt_ucntl) {
347 error = ureadc((int)pt->pt_ucntl, uio);
348 if (error)
349 return (error);
350 pt->pt_ucntl = 0;
351 return (0);
352 }
353 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
354 break;
355 }
356 if ((tp->t_state & TS_CONNECTED) == 0)
357 return (0); /* EOF */
358 if (flag & O_NONBLOCK)
359 return (EWOULDBLOCK);
360 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0);
361 if (error)
362 return (error);
363 }
364 if (pt->pt_flags & (PF_PKT|PF_UCNTL))
365 error = ureadc(0, uio);
366 while (uio->uio_resid > 0 && error == 0) {
367 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
368 if (cc <= 0)
369 break;
370 error = uiomove(buf, cc, uio);
371 }
372 ttwwakeup(tp);
373 return (error);
374}
375
376static void
377ptsstop(struct tty *tp, int flush)
378{
379 struct ptsc *pt = tp->t_sc;
380 int flag;
381
382 /* note: FLUSHREAD and FLUSHWRITE already ok */
383 if (flush == 0) {
384 flush = TIOCPKT_STOP;
385 pt->pt_flags |= PF_STOPPED;
386 } else
387 pt->pt_flags &= ~PF_STOPPED;
388 pt->pt_send |= flush;
389 /* change of perspective */
390 flag = 0;
391 if (flush & FREAD)
392 flag |= FWRITE;
393 if (flush & FWRITE)
394 flag |= FREAD;
395 ptcwakeup(tp, flag);
396}
397
398static int
399ptcpoll(struct cdev *dev, int events, struct thread *td)
400{
401 struct tty *tp = dev->si_tty;
402 struct ptsc *pt = dev->si_drv1;
403 int revents = 0;
404 int s;
405
406 if ((tp->t_state & TS_CONNECTED) == 0)
407 return (events &
408 (POLLHUP | POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM));
409
410 /*
411 * Need to block timeouts (ttrstart).
412 */
413 s = spltty();
414
415 if (events & (POLLIN | POLLRDNORM))
416 if ((tp->t_state & TS_ISOPEN) &&
417 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
418 ((pt->pt_flags & PF_PKT) && pt->pt_send) ||
419 ((pt->pt_flags & PF_UCNTL) && pt->pt_ucntl)))
420 revents |= events & (POLLIN | POLLRDNORM);
421
422 if (events & (POLLOUT | POLLWRNORM))
423 if (tp->t_state & TS_ISOPEN &&
424 (((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
425 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
426 revents |= events & (POLLOUT | POLLWRNORM);
427
428 if (events & POLLHUP)
429 if ((tp->t_state & TS_CARR_ON) == 0)
430 revents |= POLLHUP;
431
432 if (revents == 0) {
433 if (events & (POLLIN | POLLRDNORM))
434 selrecord(td, &pt->pt_selr);
435
436 if (events & (POLLOUT | POLLWRNORM))
437 selrecord(td, &pt->pt_selw);
438 }
439 splx(s);
440
441 return (revents);
442}
443
444static int
445ptcwrite(struct cdev *dev, struct uio *uio, int flag)
446{
447 struct tty *tp = dev->si_tty;
448 u_char *cp = 0;
449 int cc = 0;
450 u_char locbuf[BUFSIZ];
451 int cnt = 0;
452 int error = 0;
453
454again:
455 if ((tp->t_state&TS_ISOPEN) == 0)
456 goto block;
457 while (uio->uio_resid > 0 || cc > 0) {
458 if (cc == 0) {
459 cc = min(uio->uio_resid, BUFSIZ);
460 cp = locbuf;
461 error = uiomove(cp, cc, uio);
462 if (error)
463 return (error);
464 /* check again for safety */
465 if ((tp->t_state & TS_ISOPEN) == 0) {
466 /* adjust for data copied in but not written */
467 uio->uio_resid += cc;
468 return (EIO);
469 }
470 }
471 while (cc > 0) {
472 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
473 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
474 wakeup(TSA_HUP_OR_INPUT(tp));
475 goto block;
476 }
477 ttyld_rint(tp, *cp++);
478 cnt++;
479 cc--;
480 }
481 cc = 0;
482 }
483 return (0);
484block:
485 /*
486 * Come here to wait for slave to open, for space
487 * in outq, or space in rawq, or an empty canq.
488 */
489 if ((tp->t_state & TS_CONNECTED) == 0) {
490 /* adjust for data copied in but not written */
491 uio->uio_resid += cc;
492 return (EIO);
493 }
494 if (flag & O_NONBLOCK) {
495 /* adjust for data copied in but not written */
496 uio->uio_resid += cc;
497 if (cnt == 0)
498 return (EWOULDBLOCK);
499 return (0);
500 }
501 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0);
502 if (error) {
503 /* adjust for data copied in but not written */
504 uio->uio_resid += cc;
505 return (error);
506 }
507 goto again;
508}
509
510/*ARGSUSED*/
511static int
512ptcioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
513{
514 struct tty *tp = dev->si_tty;
515 struct ptsc *pt = dev->si_drv1;
516
517 switch (cmd) {
518
519 case TIOCGPGRP:
520 /*
521 * We avoid calling ttioctl on the controller since,
522 * in that case, tp must be the controlling terminal.
523 */
524 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
525 return (0);
526
527 case TIOCPKT:
528 if (*(int *)data) {
529 if (pt->pt_flags & PF_UCNTL)
530 return (EINVAL);
531 pt->pt_flags |= PF_PKT;
532 } else
533 pt->pt_flags &= ~PF_PKT;
534 return (0);
535
536 case TIOCUCNTL:
537 if (*(int *)data) {
538 if (pt->pt_flags & PF_PKT)
539 return (EINVAL);
540 pt->pt_flags |= PF_UCNTL;
541 } else
542 pt->pt_flags &= ~PF_UCNTL;
543 return (0);
544 }
545
546 /*
547 * The rest of the ioctls shouldn't be called until
548 * the slave is open.
549 */
550 if ((tp->t_state & TS_ISOPEN) == 0)
551 return (EAGAIN);
552
553 switch (cmd) {
554#ifdef COMPAT_43TTY
555 case TIOCSETP:
556 case TIOCSETN:
557#endif
558 case TIOCSETD:
559 case TIOCSETA:
560 case TIOCSETAW:
561 case TIOCSETAF:
562 /*
563 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
564 * ttywflush(tp) will hang if there are characters in
565 * the outq.
566 */
567 ndflush(&tp->t_outq, tp->t_outq.c_cc);
568 break;
569
570 case TIOCSIG:
571 if (*(unsigned int *)data >= NSIG ||
572 *(unsigned int *)data == 0)
573 return(EINVAL);
574 if ((tp->t_lflag&NOFLSH) == 0)
575 ttyflush(tp, FREAD|FWRITE);
576 if (tp->t_pgrp != NULL) {
577 PGRP_LOCK(tp->t_pgrp);
578 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
579 PGRP_UNLOCK(tp->t_pgrp);
580 }
581 if ((*(unsigned int *)data == SIGINFO) &&
582 ((tp->t_lflag&NOKERNINFO) == 0))
583 ttyinfo(tp);
584 return(0);
585 }
586
587 return (ptsioctl(dev, cmd, data, flag, td));
588}
589
590/*ARGSUSED*/
591static int
592ptsioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
593{
594 struct tty *tp = dev->si_tty;
595 struct ptsc *pt = dev->si_drv1;
596 u_char *cc = tp->t_cc;
597 int stop, error;
598
599 if (cmd == TIOCEXT) {
600 /*
601 * When the EXTPROC bit is being toggled, we need
602 * to send an TIOCPKT_IOCTL if the packet driver
603 * is turned on.
604 */
605 if (*(int *)data) {
606 if (pt->pt_flags & PF_PKT) {
607 pt->pt_send |= TIOCPKT_IOCTL;
608 ptcwakeup(tp, FREAD);
609 }
610 tp->t_lflag |= EXTPROC;
611 } else {
612 if ((tp->t_lflag & EXTPROC) &&
613 (pt->pt_flags & PF_PKT)) {
614 pt->pt_send |= TIOCPKT_IOCTL;
615 ptcwakeup(tp, FREAD);
616 }
617 tp->t_lflag &= ~EXTPROC;
618 }
619 return(0);
620 }
621 error = ttyioctl(dev, cmd, data, flag, td);
622 if (error == ENOTTY) {
623 if (pt->pt_flags & PF_UCNTL &&
624 (cmd & ~0xff) == UIOCCMD(0)) {
625 if (cmd & 0xff) {
626 pt->pt_ucntl = (u_char)cmd;
627 ptcwakeup(tp, FREAD);
628 }
629 return (0);
630 }
631 error = ENOTTY;
632 }
633 /*
634 * If external processing and packet mode send ioctl packet.
635 */
636 if ((tp->t_lflag&EXTPROC) && (pt->pt_flags & PF_PKT)) {
637 switch(cmd) {
638 case TIOCSETA:
639 case TIOCSETAW:
640 case TIOCSETAF:
641#ifdef COMPAT_43TTY
642 case TIOCSETP:
643 case TIOCSETN:
644 case TIOCSETC:
645 case TIOCSLTC:
646 case TIOCLBIS:
647 case TIOCLBIC:
648 case TIOCLSET:
649#endif
650 pt->pt_send |= TIOCPKT_IOCTL;
651 ptcwakeup(tp, FREAD);
652 break;
653 default:
654 break;
655 }
656 }
657 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
658 && CCEQ(cc[VSTART], CTRL('q'));
659 if (pt->pt_flags & PF_NOSTOP) {
660 if (stop) {
661 pt->pt_send &= ~TIOCPKT_NOSTOP;
662 pt->pt_send |= TIOCPKT_DOSTOP;
663 pt->pt_flags &= ~PF_NOSTOP;
664 ptcwakeup(tp, FREAD);
665 }
666 } else {
667 if (!stop) {
668 pt->pt_send &= ~TIOCPKT_DOSTOP;
669 pt->pt_send |= TIOCPKT_NOSTOP;
670 pt->pt_flags |= PF_NOSTOP;
671 ptcwakeup(tp, FREAD);
672 }
673 }
674 return (error);
675}
676
677static void
678pty_clone(void *arg, struct ucred *cr, char *name, int namelen,
679 struct cdev **dev)
680{
681 int u;
682
683 if (*dev != NULL)
684 return;
685 if (bcmp(name, "pty", 3) != 0)
686 return;
687 if (name[5] != '\0')
688 return;
689 switch (name[3]) {
690 case 'p': u = 0; break;
691 case 'q': u = 32; break;
692 case 'r': u = 64; break;
693 case 's': u = 96; break;
694 case 'P': u = 128; break;
695 case 'Q': u = 160; break;
696 case 'R': u = 192; break;
697 case 'S': u = 224; break;
698 default: return;
699 }
700 if (name[4] >= '0' && name[4] <= '9')
701 u += name[4] - '0';
702 else if (name[4] >= 'a' && name[4] <= 'v')
703 u += name[4] - 'a' + 10;
704 else
705 return;
706 *dev = make_dev_cred(&ptc_cdevsw, u, cr,
707 UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32);
708 dev_ref(*dev);
709 (*dev)->si_flags |= SI_CHEAPCLONE;
710 return;
711}
712
713static void
714ptc_drvinit(void *unused)
715{
716
717 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000);
718}
719
720SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,ptc_drvinit,NULL)