FreeBSD/Linux Kernel Cross Reference
sys/kern/tty_pty.c
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: releng/5.4/sys/kern/tty_pty.c 145335 2005-04-20 19:11:07Z cvs2svn $");
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 #ifndef BURN_BRIDGES
47 #if defined(COMPAT_43)
48 #include <sys/ioctl_compat.h>
49 #endif
50 #endif
51 #include <sys/proc.h>
52 #include <sys/tty.h>
53 #include <sys/conf.h>
54 #include <sys/fcntl.h>
55 #include <sys/poll.h>
56 #include <sys/kernel.h>
57 #include <sys/vnode.h>
58 #include <sys/signalvar.h>
59 #include <sys/malloc.h>
60
61 static MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
62
63 static void ptsstart(struct tty *tp);
64 static void ptsstop(struct tty *tp, int rw);
65 static void ptcwakeup(struct tty *tp, int flag);
66 static struct cdev *ptyinit(struct cdev *cdev);
67
68 static d_open_t ptsopen;
69 static d_close_t ptsclose;
70 static d_read_t ptsread;
71 static d_write_t ptswrite;
72 static d_ioctl_t ptyioctl;
73 static d_open_t ptcopen;
74 static d_close_t ptcclose;
75 static d_read_t ptcread;
76 static d_write_t ptcwrite;
77 static d_poll_t ptcpoll;
78
79 #define CDEV_MAJOR_S 5
80 static struct cdevsw pts_cdevsw = {
81 .d_version = D_VERSION,
82 .d_open = ptsopen,
83 .d_close = ptsclose,
84 .d_read = ptsread,
85 .d_write = ptswrite,
86 .d_ioctl = ptyioctl,
87 .d_name = "pts",
88 .d_maj = CDEV_MAJOR_S,
89 .d_flags = D_TTY | D_NEEDGIANT,
90 };
91
92 #define CDEV_MAJOR_C 6
93 static struct cdevsw ptc_cdevsw = {
94 .d_version = D_VERSION,
95 .d_open = ptcopen,
96 .d_close = ptcclose,
97 .d_read = ptcread,
98 .d_write = ptcwrite,
99 .d_ioctl = ptyioctl,
100 .d_poll = ptcpoll,
101 .d_name = "ptc",
102 .d_maj = CDEV_MAJOR_C,
103 .d_flags = D_TTY | D_NEEDGIANT,
104 };
105
106 #define BUFSIZ 100 /* Chunk size iomoved to/from user */
107
108 struct ptsc {
109 int pt_flags;
110 struct selinfo pt_selr, pt_selw;
111 u_char pt_send;
112 u_char pt_ucntl;
113 struct tty *pt_tty;
114 struct cdev *devs, *devc;
115 struct prison *pt_prison;
116 };
117
118 #define PF_PKT 0x08 /* packet mode */
119 #define PF_STOPPED 0x10 /* user told stopped */
120 #define PF_NOSTOP 0x40
121 #define PF_UCNTL 0x80 /* user control mode */
122
123 #define TSA_PTC_READ(tp) ((void *)&(tp)->t_outq.c_cf)
124 #define TSA_PTC_WRITE(tp) ((void *)&(tp)->t_rawq.c_cl)
125 #define TSA_PTS_READ(tp) ((void *)&(tp)->t_canq)
126
127 static char *names = "pqrsPQRS";
128 /*
129 * This function creates and initializes a pts/ptc pair
130 *
131 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
132 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
133 *
134 * XXX: define and add mapping of upper minor bits to allow more
135 * than 256 ptys.
136 */
137 static struct cdev *
138 ptyinit(struct cdev *devc)
139 {
140 struct cdev *devs;
141 struct ptsc *pt;
142 int n;
143
144 n = minor(devc);
145 /* For now we only map the lower 8 bits of the minor */
146 if (n & ~0xff)
147 return (NULL);
148
149 devc->si_flags &= ~SI_CHEAPCLONE;
150
151 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
152 pt->devs = devs = make_dev(&pts_cdevsw, n,
153 UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32);
154 pt->devc = devc;
155
156 pt->pt_tty = ttymalloc(pt->pt_tty);
157 devs->si_drv1 = devc->si_drv1 = pt;
158 devs->si_tty = devc->si_tty = pt->pt_tty;
159 pt->pt_tty->t_dev = devs;
160 return (devc);
161 }
162
163 /*ARGSUSED*/
164 static int
165 ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td)
166 {
167 struct tty *tp;
168 int error;
169 struct ptsc *pt;
170
171 if (!dev->si_drv1)
172 return(ENXIO);
173 pt = dev->si_drv1;
174 tp = dev->si_tty;
175 if ((tp->t_state & TS_ISOPEN) == 0) {
176 ttychars(tp); /* Set up default chars */
177 tp->t_iflag = TTYDEF_IFLAG;
178 tp->t_oflag = TTYDEF_OFLAG;
179 tp->t_lflag = TTYDEF_LFLAG;
180 tp->t_cflag = TTYDEF_CFLAG;
181 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
182 } else if (tp->t_state & TS_XCLUDE && suser(td))
183 return (EBUSY);
184 else if (pt->pt_prison != td->td_ucred->cr_prison)
185 return (EBUSY);
186 if (tp->t_oproc) /* Ctrlr still around. */
187 (void)ttyld_modem(tp, 1);
188 while ((tp->t_state & TS_CARR_ON) == 0) {
189 if (flag&FNONBLOCK)
190 break;
191 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
192 "ptsopn", 0);
193 if (error)
194 return (error);
195 }
196 error = ttyld_open(tp, dev);
197 if (error == 0)
198 ptcwakeup(tp, FREAD|FWRITE);
199 return (error);
200 }
201
202 static int
203 ptsclose(struct cdev *dev, int flag, int mode, struct thread *td)
204 {
205 struct tty *tp;
206 int err;
207
208 tp = dev->si_tty;
209 err = ttyld_close(tp, flag);
210 (void) tty_close(tp);
211 return (err);
212 }
213
214 static int
215 ptsread(struct cdev *dev, struct uio *uio, int flag)
216 {
217 struct tty *tp = dev->si_tty;
218 int error = 0;
219
220 if (tp->t_oproc)
221 error = ttyld_read(tp, uio, flag);
222 ptcwakeup(tp, FWRITE);
223 return (error);
224 }
225
226 /*
227 * Write to pseudo-tty.
228 * Wakeups of controlling tty will happen
229 * indirectly, when tty driver calls ptsstart.
230 */
231 static int
232 ptswrite(struct cdev *dev, struct uio *uio, int flag)
233 {
234 struct tty *tp;
235
236 tp = dev->si_tty;
237 if (tp->t_oproc == 0)
238 return (EIO);
239 return (ttyld_write(tp, uio, flag));
240 }
241
242 /*
243 * Start output on pseudo-tty.
244 * Wake up process selecting or sleeping for input from controlling tty.
245 */
246 static void
247 ptsstart(struct tty *tp)
248 {
249 struct ptsc *pt = tp->t_dev->si_drv1;
250
251 if (tp->t_state & TS_TTSTOP)
252 return;
253 if (pt->pt_flags & PF_STOPPED) {
254 pt->pt_flags &= ~PF_STOPPED;
255 pt->pt_send = TIOCPKT_START;
256 }
257 ptcwakeup(tp, FREAD);
258 }
259
260 static void
261 ptcwakeup(struct tty *tp, int flag)
262 {
263 struct ptsc *pt = tp->t_dev->si_drv1;
264
265 if (flag & FREAD) {
266 selwakeuppri(&pt->pt_selr, TTIPRI);
267 wakeup(TSA_PTC_READ(tp));
268 }
269 if (flag & FWRITE) {
270 selwakeuppri(&pt->pt_selw, TTOPRI);
271 wakeup(TSA_PTC_WRITE(tp));
272 }
273 }
274
275 static int
276 ptcopen(struct cdev *dev, int flag, int devtype, struct thread *td)
277 {
278 struct tty *tp;
279 struct ptsc *pt;
280
281 if (!dev->si_drv1)
282 ptyinit(dev);
283 if (!dev->si_drv1)
284 return(ENXIO);
285 tp = dev->si_tty;
286 if (tp->t_oproc)
287 return (EIO);
288 tp->t_timeout = -1;
289 tp->t_oproc = ptsstart;
290 tp->t_stop = ptsstop;
291 (void)ttyld_modem(tp, 1);
292 tp->t_lflag &= ~EXTPROC;
293 pt = dev->si_drv1;
294 pt->pt_prison = td->td_ucred->cr_prison;
295 pt->pt_flags = 0;
296 pt->pt_send = 0;
297 pt->pt_ucntl = 0;
298 return (0);
299 }
300
301 static int
302 ptcclose(struct cdev *dev, int flags, int fmt, struct thread *td)
303 {
304 struct tty *tp;
305
306 tp = dev->si_tty;
307 (void)ttyld_modem(tp, 0);
308
309 /*
310 * XXX MDMBUF makes no sense for ptys but would inhibit the above
311 * l_modem(). CLOCAL makes sense but isn't supported. Special
312 * l_modem()s that ignore carrier drop make no sense for ptys but
313 * may be in use because other parts of the line discipline make
314 * sense for ptys. Recover by doing everything that a normal
315 * ttymodem() would have done except for sending a SIGHUP.
316 */
317 if (tp->t_state & TS_ISOPEN) {
318 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
319 tp->t_state |= TS_ZOMBIE;
320 ttyflush(tp, FREAD | FWRITE);
321 }
322
323 tp->t_oproc = 0; /* mark closed */
324 return (0);
325 }
326
327 static int
328 ptcread(struct cdev *dev, struct uio *uio, int flag)
329 {
330 struct tty *tp = dev->si_tty;
331 struct ptsc *pt = dev->si_drv1;
332 char buf[BUFSIZ];
333 int error = 0, cc;
334
335 /*
336 * We want to block until the slave
337 * is open, and there's something to read;
338 * but if we lost the slave or we're NBIO,
339 * then return the appropriate error instead.
340 */
341 for (;;) {
342 if (tp->t_state&TS_ISOPEN) {
343 if (pt->pt_flags&PF_PKT && pt->pt_send) {
344 error = ureadc((int)pt->pt_send, uio);
345 if (error)
346 return (error);
347 if (pt->pt_send & TIOCPKT_IOCTL) {
348 cc = min(uio->uio_resid,
349 sizeof(tp->t_termios));
350 uiomove(&tp->t_termios, cc, uio);
351 }
352 pt->pt_send = 0;
353 return (0);
354 }
355 if (pt->pt_flags&PF_UCNTL && pt->pt_ucntl) {
356 error = ureadc((int)pt->pt_ucntl, uio);
357 if (error)
358 return (error);
359 pt->pt_ucntl = 0;
360 return (0);
361 }
362 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
363 break;
364 }
365 if ((tp->t_state & TS_CONNECTED) == 0)
366 return (0); /* EOF */
367 if (flag & IO_NDELAY)
368 return (EWOULDBLOCK);
369 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0);
370 if (error)
371 return (error);
372 }
373 if (pt->pt_flags & (PF_PKT|PF_UCNTL))
374 error = ureadc(0, uio);
375 while (uio->uio_resid > 0 && error == 0) {
376 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
377 if (cc <= 0)
378 break;
379 error = uiomove(buf, cc, uio);
380 }
381 ttwwakeup(tp);
382 return (error);
383 }
384
385 static void
386 ptsstop(struct tty *tp, int flush)
387 {
388 struct ptsc *pt = tp->t_dev->si_drv1;
389 int flag;
390
391 /* note: FLUSHREAD and FLUSHWRITE already ok */
392 if (flush == 0) {
393 flush = TIOCPKT_STOP;
394 pt->pt_flags |= PF_STOPPED;
395 } else
396 pt->pt_flags &= ~PF_STOPPED;
397 pt->pt_send |= flush;
398 /* change of perspective */
399 flag = 0;
400 if (flush & FREAD)
401 flag |= FWRITE;
402 if (flush & FWRITE)
403 flag |= FREAD;
404 ptcwakeup(tp, flag);
405 }
406
407 static int
408 ptcpoll(struct cdev *dev, int events, struct thread *td)
409 {
410 struct tty *tp = dev->si_tty;
411 struct ptsc *pt = dev->si_drv1;
412 int revents = 0;
413 int s;
414
415 if ((tp->t_state & TS_CONNECTED) == 0)
416 return (events &
417 (POLLHUP | POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM));
418
419 /*
420 * Need to block timeouts (ttrstart).
421 */
422 s = spltty();
423
424 if (events & (POLLIN | POLLRDNORM))
425 if ((tp->t_state & TS_ISOPEN) &&
426 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
427 ((pt->pt_flags & PF_PKT) && pt->pt_send) ||
428 ((pt->pt_flags & PF_UCNTL) && pt->pt_ucntl)))
429 revents |= events & (POLLIN | POLLRDNORM);
430
431 if (events & (POLLOUT | POLLWRNORM))
432 if (tp->t_state & TS_ISOPEN &&
433 (((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
434 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
435 revents |= events & (POLLOUT | POLLWRNORM);
436
437 if (events & POLLHUP)
438 if ((tp->t_state & TS_CARR_ON) == 0)
439 revents |= POLLHUP;
440
441 if (revents == 0) {
442 if (events & (POLLIN | POLLRDNORM))
443 selrecord(td, &pt->pt_selr);
444
445 if (events & (POLLOUT | POLLWRNORM))
446 selrecord(td, &pt->pt_selw);
447 }
448 splx(s);
449
450 return (revents);
451 }
452
453 static int
454 ptcwrite(struct cdev *dev, struct uio *uio, int flag)
455 {
456 struct tty *tp = dev->si_tty;
457 u_char *cp = 0;
458 int cc = 0;
459 u_char locbuf[BUFSIZ];
460 int cnt = 0;
461 int error = 0;
462
463 again:
464 if ((tp->t_state&TS_ISOPEN) == 0)
465 goto block;
466 while (uio->uio_resid > 0 || cc > 0) {
467 if (cc == 0) {
468 cc = min(uio->uio_resid, BUFSIZ);
469 cp = locbuf;
470 error = uiomove(cp, cc, uio);
471 if (error)
472 return (error);
473 /* check again for safety */
474 if ((tp->t_state & TS_ISOPEN) == 0) {
475 /* adjust for data copied in but not written */
476 uio->uio_resid += cc;
477 return (EIO);
478 }
479 }
480 while (cc > 0) {
481 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
482 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
483 wakeup(TSA_HUP_OR_INPUT(tp));
484 goto block;
485 }
486 ttyld_rint(tp, *cp++);
487 cnt++;
488 cc--;
489 }
490 cc = 0;
491 }
492 return (0);
493 block:
494 /*
495 * Come here to wait for slave to open, for space
496 * in outq, or space in rawq, or an empty canq.
497 */
498 if ((tp->t_state & TS_CONNECTED) == 0) {
499 /* adjust for data copied in but not written */
500 uio->uio_resid += cc;
501 return (EIO);
502 }
503 if (flag & IO_NDELAY) {
504 /* adjust for data copied in but not written */
505 uio->uio_resid += cc;
506 if (cnt == 0)
507 return (EWOULDBLOCK);
508 return (0);
509 }
510 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0);
511 if (error) {
512 /* adjust for data copied in but not written */
513 uio->uio_resid += cc;
514 return (error);
515 }
516 goto again;
517 }
518
519 /*ARGSUSED*/
520 static int
521 ptyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
522 {
523 struct tty *tp = dev->si_tty;
524 struct ptsc *pt = dev->si_drv1;
525 u_char *cc = tp->t_cc;
526 int stop, error;
527
528 if (devsw(dev)->d_open == ptcopen) {
529 switch (cmd) {
530
531 case TIOCGPGRP:
532 /*
533 * We avoid calling ttioctl on the controller since,
534 * in that case, tp must be the controlling terminal.
535 */
536 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
537 return (0);
538
539 case TIOCPKT:
540 if (*(int *)data) {
541 if (pt->pt_flags & PF_UCNTL)
542 return (EINVAL);
543 pt->pt_flags |= PF_PKT;
544 } else
545 pt->pt_flags &= ~PF_PKT;
546 return (0);
547
548 case TIOCUCNTL:
549 if (*(int *)data) {
550 if (pt->pt_flags & PF_PKT)
551 return (EINVAL);
552 pt->pt_flags |= PF_UCNTL;
553 } else
554 pt->pt_flags &= ~PF_UCNTL;
555 return (0);
556 }
557
558 /*
559 * The rest of the ioctls shouldn't be called until
560 * the slave is open.
561 */
562 if ((tp->t_state & TS_ISOPEN) == 0)
563 return (EAGAIN);
564
565 switch (cmd) {
566 #ifndef BURN_BRIDGES
567 #ifdef COMPAT_43
568 case TIOCSETP:
569 case TIOCSETN:
570 #endif
571 #endif
572 case TIOCSETD:
573 case TIOCSETA:
574 case TIOCSETAW:
575 case TIOCSETAF:
576 /*
577 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
578 * ttywflush(tp) will hang if there are characters in
579 * the outq.
580 */
581 ndflush(&tp->t_outq, tp->t_outq.c_cc);
582 break;
583
584 case TIOCSIG:
585 if (*(unsigned int *)data >= NSIG ||
586 *(unsigned int *)data == 0)
587 return(EINVAL);
588 if ((tp->t_lflag&NOFLSH) == 0)
589 ttyflush(tp, FREAD|FWRITE);
590 if (tp->t_pgrp != NULL) {
591 PGRP_LOCK(tp->t_pgrp);
592 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
593 PGRP_UNLOCK(tp->t_pgrp);
594 }
595 if ((*(unsigned int *)data == SIGINFO) &&
596 ((tp->t_lflag&NOKERNINFO) == 0))
597 ttyinfo(tp);
598 return(0);
599 }
600 }
601 if (cmd == TIOCEXT) {
602 /*
603 * When the EXTPROC bit is being toggled, we need
604 * to send an TIOCPKT_IOCTL if the packet driver
605 * is turned on.
606 */
607 if (*(int *)data) {
608 if (pt->pt_flags & PF_PKT) {
609 pt->pt_send |= TIOCPKT_IOCTL;
610 ptcwakeup(tp, FREAD);
611 }
612 tp->t_lflag |= EXTPROC;
613 } else {
614 if ((tp->t_lflag & EXTPROC) &&
615 (pt->pt_flags & PF_PKT)) {
616 pt->pt_send |= TIOCPKT_IOCTL;
617 ptcwakeup(tp, FREAD);
618 }
619 tp->t_lflag &= ~EXTPROC;
620 }
621 return(0);
622 }
623 error = ttyioctl(dev, cmd, data, flag, td);
624 if (error == ENOTTY) {
625 if (pt->pt_flags & PF_UCNTL &&
626 (cmd & ~0xff) == UIOCCMD(0)) {
627 if (cmd & 0xff) {
628 pt->pt_ucntl = (u_char)cmd;
629 ptcwakeup(tp, FREAD);
630 }
631 return (0);
632 }
633 error = ENOTTY;
634 }
635 /*
636 * If external processing and packet mode send ioctl packet.
637 */
638 if ((tp->t_lflag&EXTPROC) && (pt->pt_flags & PF_PKT)) {
639 switch(cmd) {
640 case TIOCSETA:
641 case TIOCSETAW:
642 case TIOCSETAF:
643 #ifndef BURN_BRIDGES
644 #ifdef COMPAT_43
645 case TIOCSETP:
646 case TIOCSETN:
647 case TIOCSETC:
648 case TIOCSLTC:
649 case TIOCLBIS:
650 case TIOCLBIC:
651 case TIOCLSET:
652 #endif
653 #endif
654 pt->pt_send |= TIOCPKT_IOCTL;
655 ptcwakeup(tp, FREAD);
656 break;
657 default:
658 break;
659 }
660 }
661 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
662 && CCEQ(cc[VSTART], CTRL('q'));
663 if (pt->pt_flags & PF_NOSTOP) {
664 if (stop) {
665 pt->pt_send &= ~TIOCPKT_NOSTOP;
666 pt->pt_send |= TIOCPKT_DOSTOP;
667 pt->pt_flags &= ~PF_NOSTOP;
668 ptcwakeup(tp, FREAD);
669 }
670 } else {
671 if (!stop) {
672 pt->pt_send &= ~TIOCPKT_DOSTOP;
673 pt->pt_send |= TIOCPKT_NOSTOP;
674 pt->pt_flags |= PF_NOSTOP;
675 ptcwakeup(tp, FREAD);
676 }
677 }
678 return (error);
679 }
680
681 static void
682 pty_clone(void *arg, char *name, int namelen, struct cdev **dev)
683 {
684 int u;
685
686 if (*dev != NULL)
687 return;
688 if (bcmp(name, "pty", 3) != 0)
689 return;
690 if (name[5] != '\0')
691 return;
692 switch (name[3]) {
693 case 'p': u = 0; break;
694 case 'q': u = 32; break;
695 case 'r': u = 64; break;
696 case 's': u = 96; break;
697 case 'P': u = 128; break;
698 case 'Q': u = 160; break;
699 case 'R': u = 192; break;
700 case 'S': u = 224; break;
701 default: return;
702 }
703 if (name[4] >= '' && name[4] <= '9')
704 u += name[4] - '';
705 else if (name[4] >= 'a' && name[4] <= 'v')
706 u += name[4] - 'a' + 10;
707 else
708 return;
709 *dev = make_dev(&ptc_cdevsw, u,
710 UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32);
711 (*dev)->si_flags |= SI_CHEAPCLONE;
712 return;
713 }
714
715 static void
716 ptc_drvinit(void *unused)
717 {
718
719 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000);
720 }
721
722 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)
Cache object: a7f9cb8af9343ac94d75e4b10c9513b4
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