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 static struct mtx ptyinit_lock;
104 MTX_SYSINIT(ptyinit_lock, &ptyinit_lock, "ptyinit", MTX_DEF);
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 int pt_devs_open, pt_devc_open;
116 struct prison *pt_prison;
117 };
118
119 #define PF_PKT 0x08 /* packet mode */
120 #define PF_STOPPED 0x10 /* user told stopped */
121 #define PF_NOSTOP 0x40
122 #define PF_UCNTL 0x80 /* user control mode */
123
124 #define TSA_PTC_READ(tp) ((void *)&(tp)->t_outq.c_cf)
125 #define TSA_PTC_WRITE(tp) ((void *)&(tp)->t_rawq.c_cl)
126 #define TSA_PTS_READ(tp) ((void *)&(tp)->t_canq)
127
128 static const char names[] = "pqrsPQRSlmnoLMNO";
129 /*
130 * This function creates and initializes a pts/ptc pair
131 *
132 * pts == /dev/tty[pqrsPQRSlmnoLMNO][0123456789abcdefghijklmnopqrstuv]
133 * ptc == /dev/pty[pqrsPQRSlmnoLMNO][0123456789abcdefghijklmnopqrstuv]
134 */
135 static struct cdev *
136 ptyinit(struct cdev *devc, struct thread *td)
137 {
138 struct ptsc *pt;
139 int n;
140
141 n = minor2unit(minor(devc));
142
143 /* We only allow for up to 32 ptys per char in "names". */
144 if (n >= 32 * (sizeof(names) - 1))
145 return (NULL);
146
147 devc->si_flags &= ~SI_CHEAPCLONE;
148
149 /*
150 * Initially do not create a slave endpoint.
151 */
152 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
153 pt->devc = devc;
154
155 pt->pt_tty = ttyalloc();
156 pt->pt_tty->t_sc = pt;
157 mtx_lock(&ptyinit_lock);
158 if (devc->si_drv1 == NULL) {
159 devc->si_drv1 = pt;
160 devc->si_tty = pt->pt_tty;
161 mtx_unlock(&ptyinit_lock);
162 } else {
163 mtx_unlock(&ptyinit_lock);
164 ttyrel(pt->pt_tty);
165 free(pt, M_PTY);
166 }
167 return (devc);
168 }
169
170 static void
171 pty_create_slave(struct ucred *cred, struct ptsc *pt, int m)
172 {
173 int n;
174
175 n = minor2unit(m);
176 KASSERT(n >= 0 && n / 32 < sizeof(names),
177 ("pty_create_slave: n %d ptsc %p", n, pt));
178 pt->devs = make_dev_cred(&pts_cdevsw, m, cred, UID_ROOT, GID_WHEEL,
179 0666, "tty%c%r", names[n / 32], n % 32);
180 pt->devs->si_drv1 = pt;
181 pt->devs->si_tty = pt->pt_tty;
182 pt->pt_tty->t_dev = pt->devs;
183 }
184
185 static void
186 pty_destroy_slave(struct ptsc *pt)
187 {
188
189 if (pt->pt_tty->t_refcnt > 1)
190 return;
191 pt->pt_tty->t_dev = NULL;
192 ttyrel(pt->pt_tty);
193 pt->pt_tty = NULL;
194 destroy_dev(pt->devs);
195 pt->devs = NULL;
196 }
197
198 static void
199 pty_maybe_destroy_slave(struct ptsc *pt)
200 {
201
202 /*
203 * vfs bugs and complications near revoke() make
204 * it currently impossible to destroy struct cdev
205 */
206 if (0 && pt->pt_devc_open == 0 && pt->pt_devs_open == 0)
207 pty_destroy_slave(pt);
208 }
209
210 /*ARGSUSED*/
211 static int
212 ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td)
213 {
214 struct tty *tp;
215 int error;
216 struct ptsc *pt;
217
218 if (!dev->si_drv1)
219 return(ENXIO);
220 pt = dev->si_drv1;
221 tp = dev->si_tty;
222
223 if ((tp->t_state & TS_ISOPEN) == 0) {
224 ttyinitmode(tp, 1, 0);
225 } else if (tp->t_state & TS_XCLUDE && priv_check(td,
226 PRIV_TTY_EXCLUSIVE))
227 return (EBUSY);
228 else if (pt->pt_prison != td->td_ucred->cr_prison &&
229 priv_check(td, PRIV_TTY_PRISON))
230 return (EBUSY);
231 if (tp->t_oproc) /* Ctrlr still around. */
232 (void)ttyld_modem(tp, 1);
233 while ((tp->t_state & TS_CARR_ON) == 0) {
234 if (flag&FNONBLOCK)
235 break;
236 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
237 "ptsopn", 0);
238 if (error)
239 return (error);
240 }
241 error = ttyld_open(tp, dev);
242 if (error == 0) {
243 ptcwakeup(tp, FREAD|FWRITE);
244 pt->pt_devs_open = 1;
245 } else
246 pty_maybe_destroy_slave(pt);
247 return (error);
248 }
249
250 static int
251 ptsclose(struct cdev *dev, int flag, int mode, struct thread *td)
252 {
253 struct ptsc *pti;
254 struct tty *tp;
255 int err;
256
257 tp = dev->si_tty;
258 pti = dev->si_drv1;
259
260 KASSERT(dev == pti->devs, ("ptsclose: dev != pti->devs"));
261
262 err = ttyld_close(tp, flag);
263 (void) tty_close(tp);
264
265 pti->pt_devs_open = 0;
266 pty_maybe_destroy_slave(pti);
267
268 return (err);
269 }
270
271 static int
272 ptsread(struct cdev *dev, struct uio *uio, int flag)
273 {
274 struct tty *tp = dev->si_tty;
275 int error = 0;
276
277 if (tp->t_oproc)
278 error = ttyld_read(tp, uio, flag);
279 ptcwakeup(tp, FWRITE);
280 return (error);
281 }
282
283 /*
284 * Write to pseudo-tty.
285 * Wakeups of controlling tty will happen
286 * indirectly, when tty driver calls ptsstart.
287 */
288 static int
289 ptswrite(struct cdev *dev, struct uio *uio, int flag)
290 {
291 struct tty *tp;
292
293 tp = dev->si_tty;
294 if (tp->t_oproc == 0)
295 return (EIO);
296 return (ttyld_write(tp, uio, flag));
297 }
298
299 /*
300 * Start output on pseudo-tty.
301 * Wake up process selecting or sleeping for input from controlling tty.
302 */
303 static void
304 ptsstart(struct tty *tp)
305 {
306 struct ptsc *pt = tp->t_sc;
307
308 if (tp->t_state & TS_TTSTOP)
309 return;
310 if (pt->pt_flags & PF_STOPPED) {
311 pt->pt_flags &= ~PF_STOPPED;
312 pt->pt_send = TIOCPKT_START;
313 }
314 ptcwakeup(tp, FREAD);
315 }
316
317 static void
318 ptcwakeup(struct tty *tp, int flag)
319 {
320 struct ptsc *pt = tp->t_sc;
321
322 if (flag & FREAD) {
323 selwakeuppri(&pt->pt_selr, TTIPRI);
324 wakeup(TSA_PTC_READ(tp));
325 }
326 if (flag & FWRITE) {
327 selwakeuppri(&pt->pt_selw, TTOPRI);
328 wakeup(TSA_PTC_WRITE(tp));
329 }
330 }
331
332 static int
333 ptcopen(struct cdev *dev, int flag, int devtype, struct thread *td)
334 {
335 struct tty *tp;
336 struct ptsc *pt;
337
338 if (!dev->si_drv1)
339 ptyinit(dev, td);
340 if (!dev->si_drv1)
341 return(ENXIO);
342
343 pt = dev->si_drv1;
344 /*
345 * In case we have destroyed the struct tty at the last connect time,
346 * we need to recreate it.
347 */
348 if (pt->pt_tty == NULL) {
349 tp = ttyalloc();
350 mtx_lock(&ptyinit_lock);
351 if (pt->pt_tty == NULL) {
352 pt->pt_tty = tp;
353 pt->pt_tty->t_sc = pt;
354 dev->si_tty = pt->pt_tty;
355 mtx_unlock(&ptyinit_lock);
356 } else {
357 mtx_unlock(&ptyinit_lock);
358 ttyrel(tp);
359 }
360 }
361 tp = dev->si_tty;
362
363 if (tp->t_oproc)
364 return (EIO);
365 tp->t_timeout = -1;
366 tp->t_oproc = ptsstart;
367 tp->t_stop = ptsstop;
368 (void)ttyld_modem(tp, 1);
369 tp->t_lflag &= ~EXTPROC;
370 pt->pt_prison = td->td_ucred->cr_prison;
371 pt->pt_flags = 0;
372 pt->pt_send = 0;
373 pt->pt_ucntl = 0;
374
375 if (!pt->devs)
376 pty_create_slave(td->td_ucred, pt, minor(dev));
377 pt->pt_devc_open = 1;
378
379 return (0);
380 }
381
382 static int
383 ptcclose(struct cdev *dev, int flags, int fmt, struct thread *td)
384 {
385 struct ptsc *pti = dev->si_drv1;
386 struct tty *tp;
387
388 tp = dev->si_tty;
389 (void)ttyld_modem(tp, 0);
390
391 /*
392 * XXX MDMBUF makes no sense for ptys but would inhibit the above
393 * l_modem(). CLOCAL makes sense but isn't supported. Special
394 * l_modem()s that ignore carrier drop make no sense for ptys but
395 * may be in use because other parts of the line discipline make
396 * sense for ptys. Recover by doing everything that a normal
397 * ttymodem() would have done except for sending a SIGHUP.
398 */
399 if (tp->t_state & TS_ISOPEN) {
400 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
401 tp->t_state |= TS_ZOMBIE;
402 ttyflush(tp, FREAD | FWRITE);
403 }
404
405 tp->t_oproc = 0; /* mark closed */
406 pti->pt_devc_open = 0;
407 pty_maybe_destroy_slave(pti);
408 return (0);
409 }
410
411 static int
412 ptcread(struct cdev *dev, struct uio *uio, int flag)
413 {
414 struct tty *tp = dev->si_tty;
415 struct ptsc *pt = dev->si_drv1;
416 char buf[BUFSIZ];
417 int error = 0, cc;
418
419 /*
420 * We want to block until the slave
421 * is open, and there's something to read;
422 * but if we lost the slave or we're NBIO,
423 * then return the appropriate error instead.
424 */
425 for (;;) {
426 if (tp->t_state&TS_ISOPEN) {
427 if (pt->pt_flags&PF_PKT && pt->pt_send) {
428 error = ureadc((int)pt->pt_send, uio);
429 if (error)
430 return (error);
431 if (pt->pt_send & TIOCPKT_IOCTL) {
432 cc = min(uio->uio_resid,
433 sizeof(tp->t_termios));
434 uiomove(&tp->t_termios, cc, uio);
435 }
436 pt->pt_send = 0;
437 return (0);
438 }
439 if (pt->pt_flags&PF_UCNTL && pt->pt_ucntl) {
440 error = ureadc((int)pt->pt_ucntl, uio);
441 if (error)
442 return (error);
443 pt->pt_ucntl = 0;
444 return (0);
445 }
446 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
447 break;
448 }
449 if ((tp->t_state & TS_CONNECTED) == 0)
450 return (0); /* EOF */
451 if (flag & O_NONBLOCK)
452 return (EWOULDBLOCK);
453 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0);
454 if (error)
455 return (error);
456 }
457 if (pt->pt_flags & (PF_PKT|PF_UCNTL))
458 error = ureadc(0, uio);
459 while (uio->uio_resid > 0 && error == 0) {
460 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
461 if (cc <= 0)
462 break;
463 error = uiomove(buf, cc, uio);
464 }
465 ttwwakeup(tp);
466 return (error);
467 }
468
469 static void
470 ptsstop(struct tty *tp, int flush)
471 {
472 struct ptsc *pt = tp->t_sc;
473 int flag;
474
475 /* note: FLUSHREAD and FLUSHWRITE already ok */
476 if (flush == 0) {
477 flush = TIOCPKT_STOP;
478 pt->pt_flags |= PF_STOPPED;
479 } else
480 pt->pt_flags &= ~PF_STOPPED;
481 pt->pt_send |= flush;
482 /* change of perspective */
483 flag = 0;
484 if (flush & FREAD)
485 flag |= FWRITE;
486 if (flush & FWRITE)
487 flag |= FREAD;
488 ptcwakeup(tp, flag);
489 }
490
491 static int
492 ptcpoll(struct cdev *dev, int events, struct thread *td)
493 {
494 struct tty *tp = dev->si_tty;
495 struct ptsc *pt = dev->si_drv1;
496 int revents = 0;
497 int s;
498
499 if ((tp->t_state & TS_CONNECTED) == 0)
500 return (events &
501 (POLLHUP | POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM));
502
503 /*
504 * Need to block timeouts (ttrstart).
505 */
506 s = spltty();
507
508 if (events & (POLLIN | POLLRDNORM))
509 if ((tp->t_state & TS_ISOPEN) &&
510 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
511 ((pt->pt_flags & PF_PKT) && pt->pt_send) ||
512 ((pt->pt_flags & PF_UCNTL) && pt->pt_ucntl)))
513 revents |= events & (POLLIN | POLLRDNORM);
514
515 if (events & (POLLOUT | POLLWRNORM))
516 if (tp->t_state & TS_ISOPEN &&
517 (((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
518 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
519 revents |= events & (POLLOUT | POLLWRNORM);
520
521 if (events & POLLHUP)
522 if ((tp->t_state & TS_CARR_ON) == 0)
523 revents |= POLLHUP;
524
525 if (revents == 0) {
526 if (events & (POLLIN | POLLRDNORM))
527 selrecord(td, &pt->pt_selr);
528
529 if (events & (POLLOUT | POLLWRNORM))
530 selrecord(td, &pt->pt_selw);
531 }
532 splx(s);
533
534 return (revents);
535 }
536
537 static int
538 ptcwrite(struct cdev *dev, struct uio *uio, int flag)
539 {
540 struct tty *tp = dev->si_tty;
541 u_char *cp = 0;
542 int cc = 0;
543 u_char locbuf[BUFSIZ];
544 int cnt = 0;
545 int error = 0;
546
547 again:
548 if ((tp->t_state&TS_ISOPEN) == 0)
549 goto block;
550 while (uio->uio_resid > 0 || cc > 0) {
551 if (cc == 0) {
552 cc = min(uio->uio_resid, BUFSIZ);
553 cp = locbuf;
554 error = uiomove(cp, cc, uio);
555 if (error)
556 return (error);
557 /* check again for safety */
558 if ((tp->t_state & TS_ISOPEN) == 0) {
559 /* adjust for data copied in but not written */
560 uio->uio_resid += cc;
561 return (EIO);
562 }
563 }
564 while (cc > 0) {
565 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
566 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
567 wakeup(TSA_HUP_OR_INPUT(tp));
568 goto block;
569 }
570 ttyld_rint(tp, *cp++);
571 cnt++;
572 cc--;
573 }
574 cc = 0;
575 }
576 return (0);
577 block:
578 /*
579 * Come here to wait for slave to open, for space
580 * in outq, or space in rawq, or an empty canq.
581 */
582 if ((tp->t_state & TS_CONNECTED) == 0) {
583 /* adjust for data copied in but not written */
584 uio->uio_resid += cc;
585 return (EIO);
586 }
587 if (flag & O_NONBLOCK) {
588 /* adjust for data copied in but not written */
589 uio->uio_resid += cc;
590 if (cnt == 0)
591 return (EWOULDBLOCK);
592 return (0);
593 }
594 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0);
595 if (error) {
596 /* adjust for data copied in but not written */
597 uio->uio_resid += cc;
598 return (error);
599 }
600 goto again;
601 }
602
603 /*ARGSUSED*/
604 static int
605 ptcioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
606 {
607 struct tty *tp = dev->si_tty;
608 struct ptsc *pt = dev->si_drv1;
609 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
610 defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
611 int ival;
612 #endif
613
614 switch (cmd) {
615
616 case TIOCGPGRP:
617 /*
618 * We avoid calling ttioctl on the controller since,
619 * in that case, tp must be the controlling terminal.
620 */
621 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
622 return (0);
623
624 case TIOCPKT:
625 if (*(int *)data) {
626 if (pt->pt_flags & PF_UCNTL)
627 return (EINVAL);
628 pt->pt_flags |= PF_PKT;
629 } else
630 pt->pt_flags &= ~PF_PKT;
631 return (0);
632
633 case TIOCUCNTL:
634 if (*(int *)data) {
635 if (pt->pt_flags & PF_PKT)
636 return (EINVAL);
637 pt->pt_flags |= PF_UCNTL;
638 } else
639 pt->pt_flags &= ~PF_UCNTL;
640 return (0);
641 }
642
643 /*
644 * The rest of the ioctls shouldn't be called until
645 * the slave is open.
646 */
647 if ((tp->t_state & TS_ISOPEN) == 0)
648 return (EAGAIN);
649
650 switch (cmd) {
651 #ifdef COMPAT_43TTY
652 case TIOCSETP:
653 case TIOCSETN:
654 #endif
655 case TIOCSETD:
656 case TIOCSETA:
657 case TIOCSETAW:
658 case TIOCSETAF:
659 /*
660 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
661 * ttywflush(tp) will hang if there are characters in
662 * the outq.
663 */
664 ndflush(&tp->t_outq, tp->t_outq.c_cc);
665 break;
666
667 #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \
668 defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
669 case _IO('t', 95):
670 ival = IOCPARM_IVAL(data);
671 data = (caddr_t)&ival;
672 /* FALLTHROUGH */
673 #endif
674 case TIOCSIG:
675 if (*(unsigned int *)data >= NSIG ||
676 *(unsigned int *)data == 0)
677 return(EINVAL);
678 if ((tp->t_lflag&NOFLSH) == 0)
679 ttyflush(tp, FREAD|FWRITE);
680 if (tp->t_pgrp != NULL) {
681 PGRP_LOCK(tp->t_pgrp);
682 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
683 PGRP_UNLOCK(tp->t_pgrp);
684 }
685 if ((*(unsigned int *)data == SIGINFO) &&
686 ((tp->t_lflag&NOKERNINFO) == 0))
687 ttyinfo(tp);
688 return(0);
689 }
690
691 return (ptsioctl(dev, cmd, data, flag, td));
692 }
693
694 /*ARGSUSED*/
695 static int
696 ptsioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
697 {
698 struct tty *tp = dev->si_tty;
699 struct ptsc *pt = dev->si_drv1;
700 u_char *cc = tp->t_cc;
701 int stop, error;
702
703 if (cmd == TIOCEXT) {
704 /*
705 * When the EXTPROC bit is being toggled, we need
706 * to send an TIOCPKT_IOCTL if the packet driver
707 * is turned on.
708 */
709 if (*(int *)data) {
710 if (pt->pt_flags & PF_PKT) {
711 pt->pt_send |= TIOCPKT_IOCTL;
712 ptcwakeup(tp, FREAD);
713 }
714 tp->t_lflag |= EXTPROC;
715 } else {
716 if ((tp->t_lflag & EXTPROC) &&
717 (pt->pt_flags & PF_PKT)) {
718 pt->pt_send |= TIOCPKT_IOCTL;
719 ptcwakeup(tp, FREAD);
720 }
721 tp->t_lflag &= ~EXTPROC;
722 }
723 return(0);
724 }
725 error = ttyioctl(dev, cmd, data, flag, td);
726 if (error == ENOTTY) {
727 if (pt->pt_flags & PF_UCNTL &&
728 (cmd & ~0xff) == UIOCCMD(0)) {
729 if (cmd & 0xff) {
730 pt->pt_ucntl = (u_char)cmd;
731 ptcwakeup(tp, FREAD);
732 }
733 return (0);
734 }
735 error = ENOTTY;
736 }
737 /*
738 * If external processing and packet mode send ioctl packet.
739 */
740 if ((tp->t_lflag&EXTPROC) && (pt->pt_flags & PF_PKT)) {
741 switch(cmd) {
742 case TIOCSETA:
743 case TIOCSETAW:
744 case TIOCSETAF:
745 #ifdef COMPAT_43TTY
746 case TIOCSETP:
747 case TIOCSETN:
748 case TIOCSETC:
749 case TIOCSLTC:
750 case TIOCLBIS:
751 case TIOCLBIC:
752 case TIOCLSET:
753 #endif
754 pt->pt_send |= TIOCPKT_IOCTL;
755 ptcwakeup(tp, FREAD);
756 break;
757 default:
758 break;
759 }
760 }
761 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
762 && CCEQ(cc[VSTART], CTRL('q'));
763 if (pt->pt_flags & PF_NOSTOP) {
764 if (stop) {
765 pt->pt_send &= ~TIOCPKT_NOSTOP;
766 pt->pt_send |= TIOCPKT_DOSTOP;
767 pt->pt_flags &= ~PF_NOSTOP;
768 ptcwakeup(tp, FREAD);
769 }
770 } else {
771 if (!stop) {
772 pt->pt_send &= ~TIOCPKT_DOSTOP;
773 pt->pt_send |= TIOCPKT_NOSTOP;
774 pt->pt_flags |= PF_NOSTOP;
775 ptcwakeup(tp, FREAD);
776 }
777 }
778 return (error);
779 }
780
781 static void
782 pty_clone(void *arg, struct ucred *cr, char *name, int namelen,
783 struct cdev **dev)
784 {
785 char *cp;
786 int u;
787
788 if (*dev != NULL)
789 return;
790 if (bcmp(name, "pty", 3) != 0)
791 return;
792 if (name[5] != '\0' || name[3] == '\0')
793 return;
794 cp = index(names, name[3]);
795 if (cp == NULL)
796 return;
797 u = (cp - names) * 32;
798 if (name[4] >= '' && name[4] <= '9')
799 u += name[4] - '';
800 else if (name[4] >= 'a' && name[4] <= 'v')
801 u += name[4] - 'a' + 10;
802 else
803 return;
804 *dev = make_dev_credf(MAKEDEV_REF, &ptc_cdevsw, unit2minor(u), cr,
805 UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32);
806 (*dev)->si_flags |= SI_CHEAPCLONE;
807 return;
808 }
809
810 static void
811 ptc_drvinit(void *unused)
812 {
813
814 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000);
815 }
816
817 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,ptc_drvinit,NULL);
Cache object: 71d00270844995cdd1a65466edb4bc70
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