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("$FreeBSD$");
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/libkern.h>
44 #include <sys/lock.h>
45 #include <sys/mutex.h>
46 #include <sys/sx.h>
47 #if defined(COMPAT_43TTY)
48 #include <sys/ioctl_compat.h>
49 #endif
50 #include <sys/priv.h>
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/uio.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, struct thread *td);
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 ptsioctl;
73 static d_open_t ptcopen;
74 static d_close_t ptcclose;
75 static d_read_t ptcread;
76 static d_ioctl_t ptcioctl;
77 static d_write_t ptcwrite;
78 static d_poll_t ptcpoll;
79
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 = ptsioctl,
87 .d_name = "pts",
88 .d_flags = D_TTY | D_NEEDGIANT,
89 };
90
91 static struct cdevsw ptc_cdevsw = {
92 .d_version = D_VERSION,
93 .d_open = ptcopen,
94 .d_close = ptcclose,
95 .d_read = ptcread,
96 .d_write = ptcwrite,
97 .d_ioctl = ptcioctl,
98 .d_poll = ptcpoll,
99 .d_name = "ptc",
100 .d_flags = D_TTY | D_NEEDGIANT,
101 };
102
103 #define BUFSIZ 100 /* Chunk size iomoved to/from user */
104
105 struct ptsc {
106 int pt_flags;
107 struct selinfo pt_selr, pt_selw;
108 u_char pt_send;
109 u_char pt_ucntl;
110 struct tty *pt_tty;
111 struct cdev *devs, *devc;
112 int pt_devs_open, pt_devc_open;
113 struct prison *pt_prison;
114 };
115
116 #define PF_PKT 0x08 /* packet mode */
117 #define PF_STOPPED 0x10 /* user told stopped */
118 #define PF_NOSTOP 0x40
119 #define PF_UCNTL 0x80 /* user control mode */
120
121 #define TSA_PTC_READ(tp) ((void *)&(tp)->t_outq.c_cf)
122 #define TSA_PTC_WRITE(tp) ((void *)&(tp)->t_rawq.c_cl)
123 #define TSA_PTS_READ(tp) ((void *)&(tp)->t_canq)
124
125 static const char names[] = "pqrsPQRSlmnoLMNO";
126 /*
127 * This function creates and initializes a pts/ptc pair
128 *
129 * pts == /dev/tty[pqrsPQRSlmnoLMNO][0123456789abcdefghijklmnopqrstuv]
130 * ptc == /dev/pty[pqrsPQRSlmnoLMNO][0123456789abcdefghijklmnopqrstuv]
131 */
132 static struct cdev *
133 ptyinit(struct cdev *devc, struct thread *td)
134 {
135 struct ptsc *pt;
136 int n;
137
138 n = minor2unit(minor(devc));
139
140 /* We only allow for up to 32 ptys per char in "names". */
141 if (n >= 32 * (sizeof(names) - 1))
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
159 static void
160 pty_create_slave(struct ucred *cred, struct ptsc *pt, int m)
161 {
162 int n;
163
164 n = minor2unit(m);
165 KASSERT(n >= 0 && n / 32 < sizeof(names),
166 ("pty_create_slave: n %d ptsc %p", n, pt));
167 pt->devs = make_dev_cred(&pts_cdevsw, m, cred, UID_ROOT, GID_WHEEL,
168 0666, "tty%c%r", names[n / 32], n % 32);
169 pt->devs->si_drv1 = pt;
170 pt->devs->si_tty = pt->pt_tty;
171 pt->pt_tty->t_dev = pt->devs;
172 }
173
174 static void
175 pty_destroy_slave(struct ptsc *pt)
176 {
177
178 if (pt->pt_tty->t_refcnt > 1)
179 return;
180 pt->pt_tty->t_dev = NULL;
181 ttyrel(pt->pt_tty);
182 pt->pt_tty = NULL;
183 destroy_dev(pt->devs);
184 pt->devs = NULL;
185 }
186
187 static void
188 pty_maybe_destroy_slave(struct ptsc *pt)
189 {
190
191 /*
192 * vfs bugs and complications near revoke() make
193 * it currently impossible to destroy struct cdev
194 */
195 if (0 && pt->pt_devc_open == 0 && pt->pt_devs_open == 0)
196 pty_destroy_slave(pt);
197 }
198
199 /*ARGSUSED*/
200 static int
201 ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td)
202 {
203 struct tty *tp;
204 int error;
205 struct ptsc *pt;
206
207 if (!dev->si_drv1)
208 return(ENXIO);
209 pt = dev->si_drv1;
210 tp = dev->si_tty;
211
212 if ((tp->t_state & TS_ISOPEN) == 0) {
213 ttyinitmode(tp, 1, 0);
214 } else if (tp->t_state & TS_XCLUDE && priv_check(td,
215 PRIV_TTY_EXCLUSIVE))
216 return (EBUSY);
217 else if (pt->pt_prison != td->td_ucred->cr_prison &&
218 priv_check(td, PRIV_TTY_PRISON))
219 return (EBUSY);
220 if (tp->t_oproc) /* Ctrlr still around. */
221 (void)ttyld_modem(tp, 1);
222 while ((tp->t_state & TS_CARR_ON) == 0) {
223 if (flag&FNONBLOCK)
224 break;
225 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
226 "ptsopn", 0);
227 if (error)
228 return (error);
229 }
230 error = ttyld_open(tp, dev);
231 if (error == 0) {
232 ptcwakeup(tp, FREAD|FWRITE);
233 pt->pt_devs_open = 1;
234 } else
235 pty_maybe_destroy_slave(pt);
236 return (error);
237 }
238
239 static int
240 ptsclose(struct cdev *dev, int flag, int mode, struct thread *td)
241 {
242 struct ptsc *pti;
243 struct tty *tp;
244 int err;
245
246 tp = dev->si_tty;
247 pti = dev->si_drv1;
248
249 KASSERT(dev == pti->devs, ("ptsclose: dev != pti->devs"));
250
251 err = ttyld_close(tp, flag);
252 (void) tty_close(tp);
253
254 pti->pt_devs_open = 0;
255 pty_maybe_destroy_slave(pti);
256
257 return (err);
258 }
259
260 static int
261 ptsread(struct cdev *dev, struct uio *uio, int flag)
262 {
263 struct tty *tp = dev->si_tty;
264 int error = 0;
265
266 if (tp->t_oproc)
267 error = ttyld_read(tp, uio, flag);
268 ptcwakeup(tp, FWRITE);
269 return (error);
270 }
271
272 /*
273 * Write to pseudo-tty.
274 * Wakeups of controlling tty will happen
275 * indirectly, when tty driver calls ptsstart.
276 */
277 static int
278 ptswrite(struct cdev *dev, struct uio *uio, int flag)
279 {
280 struct tty *tp;
281
282 tp = dev->si_tty;
283 if (tp->t_oproc == 0)
284 return (EIO);
285 return (ttyld_write(tp, uio, flag));
286 }
287
288 /*
289 * Start output on pseudo-tty.
290 * Wake up process selecting or sleeping for input from controlling tty.
291 */
292 static void
293 ptsstart(struct tty *tp)
294 {
295 struct ptsc *pt = tp->t_sc;
296
297 if (tp->t_state & TS_TTSTOP)
298 return;
299 if (pt->pt_flags & PF_STOPPED) {
300 pt->pt_flags &= ~PF_STOPPED;
301 pt->pt_send = TIOCPKT_START;
302 }
303 ptcwakeup(tp, FREAD);
304 }
305
306 static void
307 ptcwakeup(struct tty *tp, int flag)
308 {
309 struct ptsc *pt = tp->t_sc;
310
311 if (flag & FREAD) {
312 selwakeuppri(&pt->pt_selr, TTIPRI);
313 wakeup(TSA_PTC_READ(tp));
314 }
315 if (flag & FWRITE) {
316 selwakeuppri(&pt->pt_selw, TTOPRI);
317 wakeup(TSA_PTC_WRITE(tp));
318 }
319 }
320
321 static int
322 ptcopen(struct cdev *dev, int flag, int devtype, struct thread *td)
323 {
324 struct tty *tp;
325 struct ptsc *pt;
326
327 if (!dev->si_drv1)
328 ptyinit(dev, td);
329 if (!dev->si_drv1)
330 return(ENXIO);
331
332 pt = dev->si_drv1;
333 /*
334 * In case we have destroyed the struct tty at the last connect time,
335 * we need to recreate it.
336 */
337 if (pt->pt_tty == NULL) {
338 pt->pt_tty = ttyalloc();
339 pt->pt_tty->t_sc = pt;
340 dev->si_tty = pt->pt_tty;
341 }
342 tp = dev->si_tty;
343
344 if (tp->t_oproc)
345 return (EIO);
346 tp->t_timeout = -1;
347 tp->t_oproc = ptsstart;
348 tp->t_stop = ptsstop;
349 (void)ttyld_modem(tp, 1);
350 tp->t_lflag &= ~EXTPROC;
351 pt->pt_prison = td->td_ucred->cr_prison;
352 pt->pt_flags = 0;
353 pt->pt_send = 0;
354 pt->pt_ucntl = 0;
355
356 if (!pt->devs)
357 pty_create_slave(td->td_ucred, pt, minor(dev));
358 pt->pt_devc_open = 1;
359
360 return (0);
361 }
362
363 static int
364 ptcclose(struct cdev *dev, int flags, int fmt, struct thread *td)
365 {
366 struct ptsc *pti = dev->si_drv1;
367 struct tty *tp;
368
369 tp = dev->si_tty;
370 (void)ttyld_modem(tp, 0);
371
372 /*
373 * XXX MDMBUF makes no sense for ptys but would inhibit the above
374 * l_modem(). CLOCAL makes sense but isn't supported. Special
375 * l_modem()s that ignore carrier drop make no sense for ptys but
376 * may be in use because other parts of the line discipline make
377 * sense for ptys. Recover by doing everything that a normal
378 * ttymodem() would have done except for sending a SIGHUP.
379 */
380 if (tp->t_state & TS_ISOPEN) {
381 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
382 tp->t_state |= TS_ZOMBIE;
383 ttyflush(tp, FREAD | FWRITE);
384 }
385
386 tp->t_oproc = 0; /* mark closed */
387 pti->pt_devc_open = 0;
388 pty_maybe_destroy_slave(pti);
389 return (0);
390 }
391
392 static int
393 ptcread(struct cdev *dev, struct uio *uio, int flag)
394 {
395 struct tty *tp = dev->si_tty;
396 struct ptsc *pt = dev->si_drv1;
397 char buf[BUFSIZ];
398 int error = 0, cc;
399
400 /*
401 * We want to block until the slave
402 * is open, and there's something to read;
403 * but if we lost the slave or we're NBIO,
404 * then return the appropriate error instead.
405 */
406 for (;;) {
407 if (tp->t_state&TS_ISOPEN) {
408 if (pt->pt_flags&PF_PKT && pt->pt_send) {
409 error = ureadc((int)pt->pt_send, uio);
410 if (error)
411 return (error);
412 if (pt->pt_send & TIOCPKT_IOCTL) {
413 cc = min(uio->uio_resid,
414 sizeof(tp->t_termios));
415 uiomove(&tp->t_termios, cc, uio);
416 }
417 pt->pt_send = 0;
418 return (0);
419 }
420 if (pt->pt_flags&PF_UCNTL && pt->pt_ucntl) {
421 error = ureadc((int)pt->pt_ucntl, uio);
422 if (error)
423 return (error);
424 pt->pt_ucntl = 0;
425 return (0);
426 }
427 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
428 break;
429 }
430 if ((tp->t_state & TS_CONNECTED) == 0)
431 return (0); /* EOF */
432 if (flag & O_NONBLOCK)
433 return (EWOULDBLOCK);
434 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0);
435 if (error)
436 return (error);
437 }
438 if (pt->pt_flags & (PF_PKT|PF_UCNTL))
439 error = ureadc(0, uio);
440 while (uio->uio_resid > 0 && error == 0) {
441 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
442 if (cc <= 0)
443 break;
444 error = uiomove(buf, cc, uio);
445 }
446 ttwwakeup(tp);
447 return (error);
448 }
449
450 static void
451 ptsstop(struct tty *tp, int flush)
452 {
453 struct ptsc *pt = tp->t_sc;
454 int flag;
455
456 /* note: FLUSHREAD and FLUSHWRITE already ok */
457 if (flush == 0) {
458 flush = TIOCPKT_STOP;
459 pt->pt_flags |= PF_STOPPED;
460 } else
461 pt->pt_flags &= ~PF_STOPPED;
462 pt->pt_send |= flush;
463 /* change of perspective */
464 flag = 0;
465 if (flush & FREAD)
466 flag |= FWRITE;
467 if (flush & FWRITE)
468 flag |= FREAD;
469 ptcwakeup(tp, flag);
470 }
471
472 static int
473 ptcpoll(struct cdev *dev, int events, struct thread *td)
474 {
475 struct tty *tp = dev->si_tty;
476 struct ptsc *pt = dev->si_drv1;
477 int revents = 0;
478 int s;
479
480 if ((tp->t_state & TS_CONNECTED) == 0)
481 return (events &
482 (POLLHUP | POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM));
483
484 /*
485 * Need to block timeouts (ttrstart).
486 */
487 s = spltty();
488
489 if (events & (POLLIN | POLLRDNORM))
490 if ((tp->t_state & TS_ISOPEN) &&
491 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
492 ((pt->pt_flags & PF_PKT) && pt->pt_send) ||
493 ((pt->pt_flags & PF_UCNTL) && pt->pt_ucntl)))
494 revents |= events & (POLLIN | POLLRDNORM);
495
496 if (events & (POLLOUT | POLLWRNORM))
497 if (tp->t_state & TS_ISOPEN &&
498 (((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
499 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
500 revents |= events & (POLLOUT | POLLWRNORM);
501
502 if (events & POLLHUP)
503 if ((tp->t_state & TS_CARR_ON) == 0)
504 revents |= POLLHUP;
505
506 if (revents == 0) {
507 if (events & (POLLIN | POLLRDNORM))
508 selrecord(td, &pt->pt_selr);
509
510 if (events & (POLLOUT | POLLWRNORM))
511 selrecord(td, &pt->pt_selw);
512 }
513 splx(s);
514
515 return (revents);
516 }
517
518 static int
519 ptcwrite(struct cdev *dev, struct uio *uio, int flag)
520 {
521 struct tty *tp = dev->si_tty;
522 u_char *cp = 0;
523 int cc = 0;
524 u_char locbuf[BUFSIZ];
525 int cnt = 0;
526 int error = 0;
527
528 again:
529 if ((tp->t_state&TS_ISOPEN) == 0)
530 goto block;
531 while (uio->uio_resid > 0 || cc > 0) {
532 if (cc == 0) {
533 cc = min(uio->uio_resid, BUFSIZ);
534 cp = locbuf;
535 error = uiomove(cp, cc, uio);
536 if (error)
537 return (error);
538 /* check again for safety */
539 if ((tp->t_state & TS_ISOPEN) == 0) {
540 /* adjust for data copied in but not written */
541 uio->uio_resid += cc;
542 return (EIO);
543 }
544 }
545 while (cc > 0) {
546 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
547 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
548 wakeup(TSA_HUP_OR_INPUT(tp));
549 goto block;
550 }
551 ttyld_rint(tp, *cp++);
552 cnt++;
553 cc--;
554 }
555 cc = 0;
556 }
557 return (0);
558 block:
559 /*
560 * Come here to wait for slave to open, for space
561 * in outq, or space in rawq, or an empty canq.
562 */
563 if ((tp->t_state & TS_CONNECTED) == 0) {
564 /* adjust for data copied in but not written */
565 uio->uio_resid += cc;
566 return (EIO);
567 }
568 if (flag & O_NONBLOCK) {
569 /* adjust for data copied in but not written */
570 uio->uio_resid += cc;
571 if (cnt == 0)
572 return (EWOULDBLOCK);
573 return (0);
574 }
575 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0);
576 if (error) {
577 /* adjust for data copied in but not written */
578 uio->uio_resid += cc;
579 return (error);
580 }
581 goto again;
582 }
583
584 /*ARGSUSED*/
585 static int
586 ptcioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
587 {
588 struct tty *tp = dev->si_tty;
589 struct ptsc *pt = dev->si_drv1;
590 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
591 defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
592 int ival;
593 #endif
594
595 switch (cmd) {
596
597 case TIOCGPGRP:
598 /*
599 * We avoid calling ttioctl on the controller since,
600 * in that case, tp must be the controlling terminal.
601 */
602 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
603 return (0);
604
605 case TIOCPKT:
606 if (*(int *)data) {
607 if (pt->pt_flags & PF_UCNTL)
608 return (EINVAL);
609 pt->pt_flags |= PF_PKT;
610 } else
611 pt->pt_flags &= ~PF_PKT;
612 return (0);
613
614 case TIOCUCNTL:
615 if (*(int *)data) {
616 if (pt->pt_flags & PF_PKT)
617 return (EINVAL);
618 pt->pt_flags |= PF_UCNTL;
619 } else
620 pt->pt_flags &= ~PF_UCNTL;
621 return (0);
622 }
623
624 /*
625 * The rest of the ioctls shouldn't be called until
626 * the slave is open.
627 */
628 if ((tp->t_state & TS_ISOPEN) == 0)
629 return (EAGAIN);
630
631 switch (cmd) {
632 #ifdef COMPAT_43TTY
633 case TIOCSETP:
634 case TIOCSETN:
635 #endif
636 case TIOCSETD:
637 case TIOCSETA:
638 case TIOCSETAW:
639 case TIOCSETAF:
640 /*
641 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
642 * ttywflush(tp) will hang if there are characters in
643 * the outq.
644 */
645 ndflush(&tp->t_outq, tp->t_outq.c_cc);
646 break;
647
648 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
649 defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
650 case _IO('t', 95):
651 ival = IOCPARM_IVAL(data);
652 data = (caddr_t)&ival;
653 /* FALLTHROUGH */
654 #endif
655 case TIOCSIG:
656 if (*(unsigned int *)data >= NSIG ||
657 *(unsigned int *)data == 0)
658 return(EINVAL);
659 if ((tp->t_lflag&NOFLSH) == 0)
660 ttyflush(tp, FREAD|FWRITE);
661 if (tp->t_pgrp != NULL) {
662 PGRP_LOCK(tp->t_pgrp);
663 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
664 PGRP_UNLOCK(tp->t_pgrp);
665 }
666 if ((*(unsigned int *)data == SIGINFO) &&
667 ((tp->t_lflag&NOKERNINFO) == 0))
668 ttyinfo(tp);
669 return(0);
670 }
671
672 return (ptsioctl(dev, cmd, data, flag, td));
673 }
674
675 /*ARGSUSED*/
676 static int
677 ptsioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
678 {
679 struct tty *tp = dev->si_tty;
680 struct ptsc *pt = dev->si_drv1;
681 u_char *cc = tp->t_cc;
682 int stop, error;
683
684 if (cmd == TIOCEXT) {
685 /*
686 * When the EXTPROC bit is being toggled, we need
687 * to send an TIOCPKT_IOCTL if the packet driver
688 * is turned on.
689 */
690 if (*(int *)data) {
691 if (pt->pt_flags & PF_PKT) {
692 pt->pt_send |= TIOCPKT_IOCTL;
693 ptcwakeup(tp, FREAD);
694 }
695 tp->t_lflag |= EXTPROC;
696 } else {
697 if ((tp->t_lflag & EXTPROC) &&
698 (pt->pt_flags & PF_PKT)) {
699 pt->pt_send |= TIOCPKT_IOCTL;
700 ptcwakeup(tp, FREAD);
701 }
702 tp->t_lflag &= ~EXTPROC;
703 }
704 return(0);
705 }
706 error = ttyioctl(dev, cmd, data, flag, td);
707 if (error == ENOTTY) {
708 if (pt->pt_flags & PF_UCNTL &&
709 (cmd & ~0xff) == UIOCCMD(0)) {
710 if (cmd & 0xff) {
711 pt->pt_ucntl = (u_char)cmd;
712 ptcwakeup(tp, FREAD);
713 }
714 return (0);
715 }
716 error = ENOTTY;
717 }
718 /*
719 * If external processing and packet mode send ioctl packet.
720 */
721 if ((tp->t_lflag&EXTPROC) && (pt->pt_flags & PF_PKT)) {
722 switch(cmd) {
723 case TIOCSETA:
724 case TIOCSETAW:
725 case TIOCSETAF:
726 #ifdef COMPAT_43TTY
727 case TIOCSETP:
728 case TIOCSETN:
729 case TIOCSETC:
730 case TIOCSLTC:
731 case TIOCLBIS:
732 case TIOCLBIC:
733 case TIOCLSET:
734 #endif
735 pt->pt_send |= TIOCPKT_IOCTL;
736 ptcwakeup(tp, FREAD);
737 break;
738 default:
739 break;
740 }
741 }
742 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
743 && CCEQ(cc[VSTART], CTRL('q'));
744 if (pt->pt_flags & PF_NOSTOP) {
745 if (stop) {
746 pt->pt_send &= ~TIOCPKT_NOSTOP;
747 pt->pt_send |= TIOCPKT_DOSTOP;
748 pt->pt_flags &= ~PF_NOSTOP;
749 ptcwakeup(tp, FREAD);
750 }
751 } else {
752 if (!stop) {
753 pt->pt_send &= ~TIOCPKT_DOSTOP;
754 pt->pt_send |= TIOCPKT_NOSTOP;
755 pt->pt_flags |= PF_NOSTOP;
756 ptcwakeup(tp, FREAD);
757 }
758 }
759 return (error);
760 }
761
762 static void
763 pty_clone(void *arg, struct ucred *cr, char *name, int namelen,
764 struct cdev **dev)
765 {
766 char *cp;
767 int u;
768
769 if (*dev != NULL)
770 return;
771 if (bcmp(name, "pty", 3) != 0)
772 return;
773 if (name[5] != '\0' || name[3] == '\0')
774 return;
775 cp = index(names, name[3]);
776 if (cp == NULL)
777 return;
778 u = (cp - names) * 32;
779 if (name[4] >= '' && name[4] <= '9')
780 u += name[4] - '';
781 else if (name[4] >= 'a' && name[4] <= 'v')
782 u += name[4] - 'a' + 10;
783 else
784 return;
785 *dev = make_dev_credf(MAKEDEV_REF, &ptc_cdevsw, unit2minor(u), cr,
786 UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32);
787 (*dev)->si_flags |= SI_CHEAPCLONE;
788 return;
789 }
790
791 static void
792 ptc_drvinit(void *unused)
793 {
794
795 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000);
796 }
797
798 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,ptc_drvinit,NULL)
Cache object: b751297231d4bf5af741bc2ca1ad8b22
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