1 /*
2 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 * Copyright 2015, Joyent, Inc.
5 */
6
7 /*
8 * Copyright (c) 1983 Regents of the University of California.
9 * All rights reserved. The Berkeley software License Agreement
10 * specifies the terms and conditions for redistribution.
11 */
12
13 /*
14 * PTY - Stream "pseudo-terminal" device. For each "manager" side it connects
15 * to a "subsidiary" side.
16 */
17
18
19 #include <sys/param.h>
20 #include <sys/systm.h>
21 #include <sys/filio.h>
22 #include <sys/ioccom.h>
23 #include <sys/termios.h>
24 #include <sys/termio.h>
25 #include <sys/ttold.h>
26 #include <sys/stropts.h>
27 #include <sys/stream.h>
28 #include <sys/tty.h>
29 #include <sys/user.h>
30 #include <sys/conf.h>
31 #include <sys/file.h>
32 #include <sys/vnode.h>
33 #include <sys/proc.h>
34 #include <sys/uio.h>
35 #include <sys/errno.h>
36 #include <sys/strsubr.h>
37 #include <sys/poll.h>
38 #include <sys/sysmacros.h>
39 #include <sys/debug.h>
40 #include <sys/procset.h>
41 #include <sys/cred.h>
42 #include <sys/ptyvar.h>
43 #include <sys/suntty.h>
44 #include <sys/stat.h>
45
46 #include <sys/conf.h>
47 #include <sys/ddi.h>
48 #include <sys/sunddi.h>
49
50 extern int npty; /* number of pseudo-ttys configured in */
51 extern struct pty *pty_softc;
52 extern struct pollhead ptcph; /* poll head for ptcpoll() use */
53
54 int ptcopen(dev_t *, int, int, struct cred *);
55 int ptcclose(dev_t, int, int, struct cred *);
56 int ptcwrite(dev_t, struct uio *, struct cred *);
57 int ptcread(dev_t, struct uio *, struct cred *);
58 int ptcioctl(dev_t, int, intptr_t, int, struct cred *, int *);
59 int ptcpoll(dev_t, short, int, short *, struct pollhead **);
60
61 static int ptc_info(dev_info_t *, ddi_info_cmd_t, void *, void **);
62 static int ptc_attach(dev_info_t *, ddi_attach_cmd_t);
63 static dev_info_t *ptc_dip; /* for dev-to-dip conversions */
64
65 static void ptc_init(void), ptc_uninit(void);
66
67 static int makemsg(ssize_t count, struct uio *uiop,
68 struct pty *pty, mblk_t **mpp);
69
70 struct cb_ops ptc_cb_ops = {
71 ptcopen, /* open */
72 ptcclose, /* close */
73 nodev, /* strategy */
74 nodev, /* print */
75 nodev, /* dump */
76 ptcread, /* read */
77 ptcwrite, /* write */
78 ptcioctl, /* ioctl */
79 nodev, /* devmap */
80 nodev, /* mmap */
81 nodev, /* segmap */
82 ptcpoll, /* poll */
83 ddi_prop_op, /* prop_op */
84 0, /* streamtab */
85 D_NEW | D_MP /* Driver compatibility flag */
86 };
87
88 struct dev_ops ptc_ops = {
89 DEVO_REV, /* devo_rev */
90 0, /* refcnt */
91 ptc_info, /* info */
92 nulldev, /* identify */
93 nulldev, /* probe */
94 ptc_attach, /* attach */
95 nodev, /* detach */
96 nodev, /* reset */
97 &ptc_cb_ops, /* driver operations */
98 (struct bus_ops *)0, /* bus operations */
99 NULL, /* power */
100 ddi_quiesce_not_supported, /* devo_quiesce */
101 };
102
103 #include <sys/types.h>
104 #include <sys/conf.h>
105 #include <sys/param.h>
106 #include <sys/systm.h>
107 #include <sys/errno.h>
108 #include <sys/modctl.h>
109
110 extern int dseekneg_flag;
111 extern struct mod_ops mod_driverops;
112 extern struct dev_ops ptc_ops;
113
114 /*
115 * Module linkage information for the kernel.
116 */
117
118 static struct modldrv modldrv = {
119 &mod_driverops,
120 "tty pseudo driver control 'ptc'",
121 &ptc_ops,
122 };
123
124 static struct modlinkage modlinkage = {
125 MODREV_1,
126 &modldrv,
127 NULL
128 };
129
130 int
131 _init()
132 {
133 int rc;
134
135 if ((rc = mod_install(&modlinkage)) == 0)
136 ptc_init();
137 return (rc);
138 }
139
140
141 int
142 _fini()
143 {
144 int rc;
145
146 if ((rc = mod_remove(&modlinkage)) == 0)
147 ptc_uninit();
148 return (rc);
149 }
150
151 int
152 _info(struct modinfo *modinfop)
153 {
154 return (mod_info(&modlinkage, modinfop));
155 }
156
157 static char *pty_banks = PTY_BANKS;
158 static char *pty_digits = PTY_DIGITS;
159
160 /* ARGSUSED */
161 static int
162 ptc_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
163 {
164 char name[8];
165 int pty_num;
166 char *pty_digit = pty_digits;
167 char *pty_bank = pty_banks;
168
169 for (pty_num = 0; pty_num < npty; pty_num++) {
170 (void) sprintf(name, "pty%c%c", *pty_bank, *pty_digit);
171 if (ddi_create_minor_node(devi, name, S_IFCHR,
172 pty_num, DDI_PSEUDO, 0) == DDI_FAILURE) {
173 ddi_remove_minor_node(devi, NULL);
174 return (-1);
175 }
176 if (*(++pty_digit) == '\0') {
177 pty_digit = pty_digits;
178 if (*(++pty_bank) == '\0')
179 break;
180 }
181 }
182 ptc_dip = devi;
183 return (DDI_SUCCESS);
184 }
185
186 /* ARGSUSED */
187 static int
188 ptc_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
189 {
190 int error;
191
192 switch (infocmd) {
193 case DDI_INFO_DEVT2DEVINFO:
194 if (ptc_dip == NULL) {
195 *result = (void *)NULL;
196 error = DDI_FAILURE;
197 } else {
198 *result = (void *) ptc_dip;
199 error = DDI_SUCCESS;
200 }
201 break;
202 case DDI_INFO_DEVT2INSTANCE:
203 *result = (void *)0;
204 error = DDI_SUCCESS;
205 break;
206 default:
207 error = DDI_FAILURE;
208 }
209 return (error);
210 }
211
212 static void
213 ptc_init(void)
214 {
215 minor_t dev;
216
217 for (dev = 0; dev < npty; dev++) {
218 cv_init(&pty_softc[dev].pt_cv_flags, NULL, CV_DEFAULT, NULL);
219 cv_init(&pty_softc[dev].pt_cv_readq, NULL, CV_DEFAULT, NULL);
220 cv_init(&pty_softc[dev].pt_cv_writeq, NULL, CV_DEFAULT, NULL);
221 mutex_init(&pty_softc[dev].ptc_lock, NULL, MUTEX_DEFAULT, NULL);
222 }
223 }
224
225 static void
226 ptc_uninit(void)
227 {
228 minor_t dev;
229
230 for (dev = 0; dev < npty; dev++) {
231 cv_destroy(&pty_softc[dev].pt_cv_flags);
232 cv_destroy(&pty_softc[dev].pt_cv_readq);
233 cv_destroy(&pty_softc[dev].pt_cv_writeq);
234 mutex_destroy(&pty_softc[dev].ptc_lock);
235 }
236 }
237
238 /*
239 * Manager side. This is not, alas, a streams device; there are too
240 * many old features that we must support and that don't work well
241 * with streams.
242 */
243
244 int
245 ptcopen(dev_t *devp, int flag, int otyp, struct cred *cred)
246 {
247 dev_t dev = *devp;
248 struct pty *pty;
249 queue_t *q;
250
251 if (getminor(dev) >= npty) {
252 return (ENXIO);
253 }
254 pty = &pty_softc[getminor(dev)];
255 mutex_enter(&pty->ptc_lock);
256 if (pty->pt_flags & PF_CARR_ON) {
257 mutex_exit(&pty->ptc_lock);
258 return (EIO); /* manager is exclusive use */
259 /* XXX - should be EBUSY! */
260 }
261 if (pty->pt_flags & PF_WOPEN) {
262 pty->pt_flags &= ~PF_WOPEN;
263 cv_broadcast(&pty->pt_cv_flags);
264 }
265
266 if ((q = pty->pt_ttycommon.t_readq) != NULL) {
267 /*
268 * Send an un-hangup to the subsidiary, since "carrier" is
269 * coming back up. Make sure we're doing canonicalization.
270 */
271 (void) putctl(q, M_UNHANGUP);
272 (void) putctl1(q, M_CTL, MC_DOCANON);
273 }
274 pty->pt_flags |= PF_CARR_ON;
275 pty->pt_send = 0;
276 pty->pt_ucntl = 0;
277
278 mutex_exit(&pty->ptc_lock);
279 return (0);
280 }
281
282 int
283 ptcclose(dev_t dev, int flag, int otyp, struct cred *cred)
284 {
285 struct pty *pty;
286 mblk_t *bp;
287 queue_t *q;
288
289 pty = &pty_softc[getminor(dev)];
290
291 mutex_enter(&pty->ptc_lock);
292 if ((q = pty->pt_ttycommon.t_readq) != NULL) {
293 /*
294 * Send a hangup to the subsidiary, since "carrier" is dropping.
295 */
296 (void) putctl(q, M_HANGUP);
297 }
298
299 /*
300 * Clear out all the manager-side state. This also
301 * clears PF_CARR_ON, which is correct because the
302 * "carrier" is dropping since the manager process
303 * is going away.
304 */
305 pty->pt_flags &= (PF_WOPEN|PF_STOPPED|PF_NOSTOP);
306 while ((bp = pty->pt_stuffqfirst) != NULL) {
307 if ((pty->pt_stuffqfirst = bp->b_next) == NULL)
308 pty->pt_stuffqlast = NULL;
309 else
310 pty->pt_stuffqfirst->b_prev = NULL;
311 pty->pt_stuffqlen--;
312 bp->b_next = bp->b_prev = NULL;
313 freemsg(bp);
314 }
315 mutex_exit(&pty->ptc_lock);
316 return (0);
317 }
318
319 int
320 ptcread(dev_t dev, struct uio *uio, struct cred *cred)
321 {
322 struct pty *pty = &pty_softc[getminor(dev)];
323 mblk_t *bp, *nbp;
324 queue_t *q;
325 unsigned char tmp;
326 ssize_t cc;
327 int error;
328 off_t off;
329
330 off = uio->uio_offset;
331
332 mutex_enter(&pty->ptc_lock);
333
334 for (;;) {
335 while (pty->pt_flags & PF_READ) {
336 pty->pt_flags |= PF_WREAD;
337 cv_wait(&pty->pt_cv_flags, &pty->ptc_lock);
338 }
339 pty->pt_flags |= PF_READ;
340
341 /*
342 * If there's a TIOCPKT packet waiting, pass it back.
343 */
344 while (pty->pt_flags&(PF_PKT|PF_UCNTL) && pty->pt_send) {
345 tmp = pty->pt_send;
346 pty->pt_send = 0;
347 mutex_exit(&pty->ptc_lock);
348 error = ureadc((int)tmp, uio);
349 uio->uio_offset = off;
350 mutex_enter(&pty->ptc_lock);
351 if (error) {
352 pty->pt_send |= tmp;
353 goto out;
354 }
355 if (pty->pt_send == 0)
356 goto out;
357 }
358
359 /*
360 * If there's a user-control packet waiting, pass the
361 * "ioctl" code back.
362 */
363 while ((pty->pt_flags & (PF_UCNTL|PF_43UCNTL)) &&
364 pty->pt_ucntl) {
365 tmp = pty->pt_ucntl;
366 pty->pt_ucntl = 0;
367 mutex_exit(&pty->ptc_lock);
368 error = ureadc((int)tmp, uio);
369 uio->uio_offset = off;
370 mutex_enter(&pty->ptc_lock);
371 if (error) {
372 if (pty->pt_ucntl == 0)
373 pty->pt_ucntl = tmp;
374 goto out;
375 }
376 if (pty->pt_ucntl == 0)
377 goto out;
378 }
379
380 /*
381 * If there's any data waiting, pass it back.
382 */
383 if ((q = pty->pt_ttycommon.t_writeq) != NULL &&
384 q->q_first != NULL &&
385 !(pty->pt_flags & PF_STOPPED)) {
386 if (pty->pt_flags & (PF_PKT|PF_UCNTL|PF_43UCNTL)) {
387 /*
388 * We're about to begin a move in packet or
389 * user-control mode; precede the data with a
390 * data header.
391 */
392 mutex_exit(&pty->ptc_lock);
393 error = ureadc(TIOCPKT_DATA, uio);
394 uio->uio_offset = off;
395 mutex_enter(&pty->ptc_lock);
396 if (error != 0)
397 goto out;
398 if ((q = pty->pt_ttycommon.t_writeq) == NULL)
399 goto out;
400 }
401 if ((bp = getq(q)) == NULL)
402 goto out;
403 while (uio->uio_resid > 0) {
404 while ((cc = bp->b_wptr - bp->b_rptr) == 0) {
405 nbp = bp->b_cont;
406 freeb(bp);
407 if ((bp = nbp) == NULL) {
408 if ((q == NULL) ||
409 (bp = getq(q)) == NULL)
410 goto out;
411 }
412 }
413 cc = MIN(cc, uio->uio_resid);
414 mutex_exit(&pty->ptc_lock);
415 error = uiomove((caddr_t)bp->b_rptr,
416 cc, UIO_READ, uio);
417 uio->uio_offset = off;
418 mutex_enter(&pty->ptc_lock);
419 if (error != 0) {
420 freemsg(bp);
421 goto out;
422 }
423 q = pty->pt_ttycommon.t_writeq;
424 bp->b_rptr += cc;
425 }
426 /*
427 * Strip off zero-length blocks from the front of
428 * what we're putting back on the queue.
429 */
430 while ((bp->b_wptr - bp->b_rptr) == 0) {
431 nbp = bp->b_cont;
432 freeb(bp);
433 if ((bp = nbp) == NULL)
434 goto out; /* nothing left */
435 }
436 if (q != NULL)
437 (void) putbq(q, bp);
438 else
439 freemsg(bp);
440 goto out;
441 }
442
443 /*
444 * If there's any TIOCSTI-stuffed characters, pass
445 * them back. (They currently arrive after all output;
446 * is this correct?)
447 */
448 if (pty->pt_flags&PF_UCNTL && pty->pt_stuffqfirst != NULL) {
449 mutex_exit(&pty->ptc_lock);
450 error = ureadc(TIOCSTI&0xff, uio);
451 mutex_enter(&pty->ptc_lock);
452 while (error == 0 &&
453 (bp = pty->pt_stuffqfirst) != NULL &&
454 uio->uio_resid > 0) {
455 pty->pt_stuffqlen--;
456 if ((pty->pt_stuffqfirst = bp->b_next) == NULL)
457 pty->pt_stuffqlast = NULL;
458 else
459 pty->pt_stuffqfirst->b_prev = NULL;
460 mutex_exit(&pty->ptc_lock);
461 error = ureadc((int)*bp->b_rptr, uio);
462 bp->b_next = bp->b_prev = NULL;
463 freemsg(bp);
464 mutex_enter(&pty->ptc_lock);
465 }
466 uio->uio_offset = off;
467 goto out;
468 }
469
470 /*
471 * There's no data available.
472 * We want to block until the subsidiary is open, and there's
473 * something to read; but if we lost the subsidiary or we're
474 * NBIO, then return the appropriate error instead.
475 * POSIX-style non-block has top billing and gives -1 with
476 * errno = EAGAIN, BSD-style comes next and gives -1 with
477 * errno = EWOULDBLOCK, SVID-style comes last and gives 0.
478 */
479 if (pty->pt_flags & PF_SUBSIDGONE) {
480 error = EIO;
481 goto out;
482 }
483 if (uio->uio_fmode & FNONBLOCK) {
484 error = EAGAIN;
485 goto out;
486 }
487 if (pty->pt_flags & PF_NBIO) {
488 error = EWOULDBLOCK;
489 goto out;
490 }
491 if (uio->uio_fmode & FNDELAY)
492 goto out;
493
494 if (pty->pt_flags & PF_WREAD)
495 cv_broadcast(&pty->pt_cv_flags);
496
497 pty->pt_flags &= ~(PF_READ | PF_WREAD);
498
499
500 if (!cv_wait_sig(&pty->pt_cv_writeq, &pty->ptc_lock)) {
501 mutex_exit(&pty->ptc_lock);
502 return (EINTR);
503 }
504 }
505
506 out:
507 if (pty->pt_flags & PF_WREAD)
508 cv_broadcast(&pty->pt_cv_flags);
509
510 pty->pt_flags &= ~(PF_READ | PF_WREAD);
511
512 mutex_exit(&pty->ptc_lock);
513 return (error);
514 }
515
516 int
517 ptcwrite(dev_t dev, struct uio *uio, struct cred *cred)
518 {
519 struct pty *pty = &pty_softc[getminor(dev)];
520 queue_t *q;
521 int written;
522 mblk_t *mp;
523 int fmode = 0;
524 int error = 0;
525
526 off_t off;
527 off = uio->uio_offset;
528
529 mutex_enter(&pty->ptc_lock);
530
531 again:
532 while (pty->pt_flags & PF_WRITE) {
533 pty->pt_flags |= PF_WWRITE;
534 cv_wait(&pty->pt_cv_flags, &pty->ptc_lock);
535 }
536
537 pty->pt_flags |= PF_WRITE;
538
539 if ((q = pty->pt_ttycommon.t_readq) == NULL) {
540
541 /*
542 * Wait for subsidiary to open.
543 */
544 if (pty->pt_flags & PF_SUBSIDGONE) {
545 error = EIO;
546 goto out;
547 }
548 if (uio->uio_fmode & FNONBLOCK) {
549 error = EAGAIN;
550 goto out;
551 }
552 if (pty->pt_flags & PF_NBIO) {
553 error = EWOULDBLOCK;
554 goto out;
555 }
556 if (uio->uio_fmode & FNDELAY)
557 goto out;
558
559 if (pty->pt_flags & PF_WWRITE)
560 cv_broadcast(&pty->pt_cv_flags);
561
562 pty->pt_flags &= ~(PF_WRITE | PF_WWRITE);
563
564 if (!cv_wait_sig(&pty->pt_cv_readq, &pty->ptc_lock)) {
565 mutex_exit(&pty->ptc_lock);
566 return (EINTR);
567 }
568
569 goto again;
570 }
571
572 /*
573 * If in remote mode, even zero-length writes generate messages.
574 */
575 written = 0;
576 if ((pty->pt_flags & PF_REMOTE) || uio->uio_resid > 0) {
577 do {
578 while (!canput(q)) {
579 /*
580 * Wait for subsidiary's read queue to unclog.
581 */
582 if (pty->pt_flags & PF_SUBSIDGONE) {
583 error = EIO;
584 goto out;
585 }
586 if (uio->uio_fmode & FNONBLOCK) {
587 if (!written)
588 error = EAGAIN;
589 goto out;
590 }
591 if (pty->pt_flags & PF_NBIO) {
592 if (!written)
593 error = EWOULDBLOCK;
594 goto out;
595 }
596 if (uio->uio_fmode & FNDELAY)
597 goto out;
598
599 if (pty->pt_flags & PF_WWRITE)
600 cv_broadcast(&pty->pt_cv_flags);
601
602 pty->pt_flags &= ~(PF_WRITE | PF_WWRITE);
603
604 if (!cv_wait_sig(&pty->pt_cv_readq,
605 &pty->ptc_lock)) {
606 mutex_exit(&pty->ptc_lock);
607 return (EINTR);
608 }
609
610 while (pty->pt_flags & PF_WRITE) {
611 pty->pt_flags |= PF_WWRITE;
612 cv_wait(&pty->pt_cv_flags,
613 &pty->ptc_lock);
614 }
615
616 pty->pt_flags |= PF_WRITE;
617 }
618
619 if ((pty->pt_flags & PF_NBIO) &&
620 !(uio->uio_fmode & FNONBLOCK)) {
621 fmode = uio->uio_fmode;
622 uio->uio_fmode |= FNONBLOCK;
623 }
624
625 error = makemsg(uio->uio_resid, uio, pty, &mp);
626 uio->uio_offset = off;
627 if (fmode)
628 uio->uio_fmode = fmode;
629 if (error != 0) {
630 if (error != EAGAIN && error != EWOULDBLOCK)
631 goto out;
632 if (uio->uio_fmode & FNONBLOCK) {
633 if (!written)
634 error = EAGAIN;
635 goto out;
636 }
637 if (pty->pt_flags & PF_NBIO) {
638 if (!written)
639 error = EWOULDBLOCK;
640 goto out;
641 }
642 if (uio->uio_fmode & FNDELAY)
643 goto out;
644 cmn_err(CE_PANIC,
645 "ptcwrite: non null return from"
646 " makemsg");
647 }
648
649 /*
650 * Check again for safety; since "uiomove" can take a
651 * page fault, there's no guarantee that "pt_flags"
652 * didn't change while it was happening.
653 */
654 if ((q = pty->pt_ttycommon.t_readq) == NULL) {
655 if (mp)
656 freemsg(mp);
657 error = EIO;
658 goto out;
659 }
660 if (mp)
661 (void) putq(q, mp);
662 written = 1;
663 } while (uio->uio_resid > 0);
664 }
665 out:
666 if (pty->pt_flags & PF_WWRITE)
667 cv_broadcast(&pty->pt_cv_flags);
668
669 pty->pt_flags &= ~(PF_WRITE | PF_WWRITE);
670
671 mutex_exit(&pty->ptc_lock);
672 return (error);
673 }
674
675 #define copy_in(data, d_arg) \
676 if (copyin((caddr_t)data, &d_arg, sizeof (int)) != 0) \
677 return (EFAULT)
678
679 #define copy_out(d_arg, data) \
680 if (copyout(&d_arg, (caddr_t)data, sizeof (int)) != 0) \
681 return (EFAULT)
682
683 int
684 ptcioctl(dev_t dev, int cmd, intptr_t data, int flag, struct cred *cred,
685 int *rvalp)
686 {
687 struct pty *pty = &pty_softc[getminor(dev)];
688 queue_t *q;
689 struct ttysize tty_arg;
690 struct winsize win_arg;
691 int d_arg;
692 int err;
693
694 switch (cmd) {
695
696 case TIOCPKT:
697 copy_in(data, d_arg);
698 mutex_enter(&pty->ptc_lock);
699 if (d_arg) {
700 if (pty->pt_flags & (PF_UCNTL|PF_43UCNTL)) {
701 mutex_exit(&pty->ptc_lock);
702 return (EINVAL);
703 }
704 pty->pt_flags |= PF_PKT;
705 } else
706 pty->pt_flags &= ~PF_PKT;
707 mutex_exit(&pty->ptc_lock);
708 break;
709
710 case TIOCUCNTL:
711 copy_in(data, d_arg);
712 mutex_enter(&pty->ptc_lock);
713 if (d_arg) {
714 if (pty->pt_flags & (PF_PKT|PF_UCNTL)) {
715 mutex_exit(&pty->ptc_lock);
716 return (EINVAL);
717 }
718 pty->pt_flags |= PF_43UCNTL;
719 } else
720 pty->pt_flags &= ~PF_43UCNTL;
721 mutex_exit(&pty->ptc_lock);
722 break;
723
724 case TIOCTCNTL:
725 copy_in(data, d_arg);
726 mutex_enter(&pty->ptc_lock);
727 if (d_arg) {
728 if (pty->pt_flags & PF_PKT) {
729 mutex_exit(&pty->ptc_lock);
730 return (EINVAL);
731 }
732 pty->pt_flags |= PF_UCNTL;
733 } else
734 pty->pt_flags &= ~PF_UCNTL;
735 mutex_exit(&pty->ptc_lock);
736 break;
737
738 case TIOCREMOTE:
739 copy_in(data, d_arg);
740 mutex_enter(&pty->ptc_lock);
741 if (d_arg) {
742 if ((q = pty->pt_ttycommon.t_readq) != NULL)
743 (void) putctl1(q, M_CTL, MC_NOCANON);
744 pty->pt_flags |= PF_REMOTE;
745 } else {
746 if ((q = pty->pt_ttycommon.t_readq) != NULL)
747 (void) putctl1(q, M_CTL, MC_DOCANON);
748 pty->pt_flags &= ~PF_REMOTE;
749 }
750 mutex_exit(&pty->ptc_lock);
751 break;
752
753 case TIOCSIGNAL:
754 /*
755 * Blast a M_PCSIG message up the subsidiary stream; the
756 * signal number is the argument to the "ioctl".
757 */
758 copy_in(data, d_arg);
759 mutex_enter(&pty->ptc_lock);
760 if ((q = pty->pt_ttycommon.t_readq) != NULL)
761 (void) putctl1(q, M_PCSIG, (int)d_arg);
762 mutex_exit(&pty->ptc_lock);
763 break;
764
765 case FIONBIO:
766 copy_in(data, d_arg);
767 mutex_enter(&pty->ptc_lock);
768 if (d_arg)
769 pty->pt_flags |= PF_NBIO;
770 else
771 pty->pt_flags &= ~PF_NBIO;
772 mutex_exit(&pty->ptc_lock);
773 break;
774
775 case FIOASYNC:
776 copy_in(data, d_arg);
777 mutex_enter(&pty->ptc_lock);
778 if (d_arg)
779 pty->pt_flags |= PF_ASYNC;
780 else
781 pty->pt_flags &= ~PF_ASYNC;
782 mutex_exit(&pty->ptc_lock);
783 break;
784
785 /*
786 * These, at least, can work on the manager-side process
787 * group.
788 */
789 case FIOGETOWN:
790 mutex_enter(&pty->ptc_lock);
791 d_arg = -pty->pt_pgrp;
792 mutex_exit(&pty->ptc_lock);
793 copy_out(d_arg, data);
794 break;
795
796 case FIOSETOWN:
797 copy_in(data, d_arg);
798 mutex_enter(&pty->ptc_lock);
799 pty->pt_pgrp = (short)(-d_arg);
800 mutex_exit(&pty->ptc_lock);
801 break;
802
803 case FIONREAD: {
804 /*
805 * Return the total number of bytes of data in all messages in
806 * subsidiary write queue, which is manager read queue, unless
807 * a special message would be read.
808 */
809 mblk_t *mp;
810 size_t count = 0;
811
812 mutex_enter(&pty->ptc_lock);
813 if (pty->pt_flags&(PF_PKT|PF_UCNTL) && pty->pt_send)
814 count = 1; /* will return 1 byte */
815 else if ((pty->pt_flags & (PF_UCNTL|PF_43UCNTL)) &&
816 pty->pt_ucntl)
817 count = 1; /* will return 1 byte */
818 else if ((q = pty->pt_ttycommon.t_writeq) != NULL &&
819 q->q_first != NULL && !(pty->pt_flags & PF_STOPPED)) {
820 /*
821 * Will return whatever data is queued up.
822 */
823 for (mp = q->q_first; mp != NULL; mp = mp->b_next)
824 count += msgdsize(mp);
825 } else if ((pty->pt_flags & PF_UCNTL) &&
826 pty->pt_stuffqfirst != NULL) {
827 /*
828 * Will return STI'ed data.
829 */
830 count = pty->pt_stuffqlen + 1;
831 }
832
833 /*
834 * Under LP64 we could have more than INT_MAX bytes to report,
835 * but the interface is defined in terms of int, so we cap it.
836 */
837 d_arg = MIN(count, INT_MAX);
838 mutex_exit(&pty->ptc_lock);
839 copy_out(d_arg, data);
840 break;
841 }
842
843 case TIOCSWINSZ:
844 /*
845 * Unfortunately, TIOCSWINSZ and the old TIOCSSIZE "ioctl"s
846 * share the same code. If the upper 16 bits of the number
847 * of lines is non-zero, it was probably a TIOCSWINSZ,
848 * with both "ws_row" and "ws_col" non-zero.
849 */
850 if (copyin((caddr_t)data,
851 &tty_arg, sizeof (struct ttysize)) != 0)
852 return (EFAULT);
853
854 if ((tty_arg.ts_lines & 0xffff0000) != 0) {
855 /*
856 * It's a TIOCSWINSZ.
857 */
858 win_arg = *(struct winsize *)&tty_arg;
859
860 mutex_enter(&pty->ptc_lock);
861 /*
862 * If the window size changed, send a SIGWINCH.
863 */
864 if (bcmp(&pty->pt_ttycommon.t_size,
865 &win_arg, sizeof (struct winsize))) {
866 pty->pt_ttycommon.t_size = win_arg;
867 if ((q = pty->pt_ttycommon.t_readq) != NULL)
868 (void) putctl1(q, M_PCSIG, SIGWINCH);
869 }
870 mutex_exit(&pty->ptc_lock);
871 break;
872 }
873 /* FALLTHROUGH */
874
875 case TIOCSSIZE:
876 if (copyin((caddr_t)data,
877 &tty_arg, sizeof (struct ttysize)) != 0)
878 return (EFAULT);
879 mutex_enter(&pty->ptc_lock);
880 pty->pt_ttycommon.t_size.ws_row = (ushort_t)tty_arg.ts_lines;
881 pty->pt_ttycommon.t_size.ws_col = (ushort_t)tty_arg.ts_cols;
882 pty->pt_ttycommon.t_size.ws_xpixel = 0;
883 pty->pt_ttycommon.t_size.ws_ypixel = 0;
884 mutex_exit(&pty->ptc_lock);
885 break;
886
887 case TIOCGWINSZ:
888 mutex_enter(&pty->ptc_lock);
889 win_arg = pty->pt_ttycommon.t_size;
890 mutex_exit(&pty->ptc_lock);
891 if (copyout(&win_arg, (caddr_t)data,
892 sizeof (struct winsize)) != 0)
893 return (EFAULT);
894 break;
895
896 case TIOCGSIZE:
897 mutex_enter(&pty->ptc_lock);
898 tty_arg.ts_lines = pty->pt_ttycommon.t_size.ws_row;
899 tty_arg.ts_cols = pty->pt_ttycommon.t_size.ws_col;
900 mutex_exit(&pty->ptc_lock);
901 if (copyout(&tty_arg, (caddr_t)data,
902 sizeof (struct ttysize)) != 0)
903 return (EFAULT);
904 break;
905
906 /*
907 * XXX These should not be here. The only reason why an
908 * "ioctl" on the manager side should get the
909 * subsidiary side's process group is so that the process on
910 * the manager side can send a signal to the subsidiary
911 * side's process group; however, this is better done
912 * with TIOCSIGNAL, both because it doesn't require us
913 * to know about the subsidiary side's process group and because
914 * the manager side process may not have permission to
915 * send that signal to the entire process group.
916 *
917 * However, since vanilla 4BSD doesn't provide TIOCSIGNAL,
918 * we can't just get rid of them.
919 */
920 case TIOCGPGRP:
921 case TIOCSPGRP:
922 /*
923 * This is amazingly disgusting, but the stupid semantics of
924 * 4BSD pseudo-ttys makes us do it. If we do one of these guys
925 * on the manager side, it really applies to the subsidiary-side
926 * stream. It should NEVER have been possible to do ANY sort
927 * of tty operations on the manager side, but it's too late
928 * to fix that now. However, we won't waste our time implementing
929 * anything that the original pseudo-tty driver didn't handle.
930 */
931 case TIOCGETP:
932 case TIOCSETP:
933 case TIOCSETN:
934 case TIOCGETC:
935 case TIOCSETC:
936 case TIOCGLTC:
937 case TIOCSLTC:
938 case TIOCLGET:
939 case TIOCLSET:
940 case TIOCLBIS:
941 case TIOCLBIC:
942 mutex_enter(&pty->ptc_lock);
943 if (pty->pt_vnode == NULL) {
944 mutex_exit(&pty->ptc_lock);
945 return (EIO);
946 }
947 pty->pt_flags |= PF_IOCTL;
948 mutex_exit(&pty->ptc_lock);
949 err = strioctl(pty->pt_vnode, cmd, data, flag,
950 U_TO_K, cred, rvalp);
951 mutex_enter(&pty->ptc_lock);
952 if (pty->pt_flags & PF_WAIT)
953 cv_signal(&pty->pt_cv_flags);
954 pty->pt_flags &= ~(PF_IOCTL|PF_WAIT);
955 mutex_exit(&pty->ptc_lock);
956 return (err);
957
958 default:
959 return (ENOTTY);
960 }
961
962 return (0);
963 }
964
965
966 int
967 ptcpoll(dev_t dev, short events, int anyyet, short *reventsp,
968 struct pollhead **phpp)
969 {
970 struct pty *pty = &pty_softc[getminor(dev)];
971 pollhead_t *php = &ptcph;
972 queue_t *q;
973 int pos = 0;
974
975 if (polllock(php, &pty->ptc_lock) != 0) {
976 *reventsp = POLLNVAL;
977 return (0);
978 }
979
980 ASSERT(MUTEX_HELD(&pty->ptc_lock));
981
982 *reventsp = 0;
983 if (pty->pt_flags & PF_SUBSIDGONE) {
984 if (events & (POLLIN|POLLRDNORM))
985 *reventsp |= (events & (POLLIN|POLLRDNORM));
986 if (events & (POLLOUT|POLLWRNORM))
987 *reventsp |= (events & (POLLOUT|POLLWRNORM));
988 mutex_exit(&pty->ptc_lock);
989 /*
990 * A non NULL pollhead pointer should be returned in case
991 * user polls for 0 events.
992 */
993 *phpp = !anyyet && !*reventsp ? php : (struct pollhead *)NULL;
994 return (0);
995 }
996 if (events & (POLLIN|POLLRDNORM)) {
997 if ((q = pty->pt_ttycommon.t_writeq) != NULL &&
998 q->q_first != NULL && !(pty->pt_flags & PF_STOPPED)) {
999 /*
1000 * Regular data is available.
1001 */
1002 *reventsp |= (events & (POLLIN|POLLRDNORM));
1003 pos++;
1004 }
1005 if (pty->pt_flags & (PF_PKT|PF_UCNTL) && pty->pt_send) {
1006 /*
1007 * A control packet is available.
1008 */
1009 *reventsp |= (events & (POLLIN|POLLRDNORM));
1010 pos++;
1011 }
1012 if ((pty->pt_flags & PF_UCNTL) &&
1013 (pty->pt_ucntl || pty->pt_stuffqfirst != NULL)) {
1014 /*
1015 * "ioctl" or TIOCSTI data is available.
1016 */
1017 *reventsp |= (events & (POLLIN|POLLRDNORM));
1018 pos++;
1019 }
1020 if ((pty->pt_flags & PF_43UCNTL) && pty->pt_ucntl) {
1021 *reventsp |= (events & (POLLIN|POLLRDNORM));
1022 pos++;
1023 }
1024 }
1025 if (events & (POLLOUT|POLLWRNORM)) {
1026 if ((q = pty->pt_ttycommon.t_readq) != NULL &&
1027 canput(q)) {
1028 *reventsp |= (events & (POLLOUT|POLLWRNORM));
1029 pos++;
1030 }
1031 }
1032 if (events & POLLERR) {
1033 *reventsp |= POLLERR;
1034 pos++;
1035 }
1036 if (events == 0) { /* "exceptional conditions" */
1037 if (((pty->pt_flags & (PF_PKT|PF_UCNTL)) && pty->pt_send) ||
1038 ((pty->pt_flags & PF_UCNTL) &&
1039 (pty->pt_ucntl || pty->pt_stuffqfirst != NULL))) {
1040 pos++;
1041 }
1042 if ((pty->pt_flags & PF_43UCNTL) && pty->pt_ucntl) {
1043 pos++;
1044 }
1045 }
1046
1047 /*
1048 * Arrange to have poll waken up when event occurs.
1049 * if (!anyyet)
1050 */
1051 if (!pos) {
1052 *phpp = php;
1053 *reventsp = 0;
1054 }
1055
1056 mutex_exit(&pty->ptc_lock);
1057 return (0);
1058 }
1059
1060 void
1061 gsignal(int pid, int sig)
1062 {
1063 procset_t set;
1064 sigsend_t v;
1065
1066 bzero(&v, sizeof (v));
1067 v.sig = sig;
1068 v.perm = 0;
1069 v.checkperm = 1;
1070 v.value.sival_ptr = NULL;
1071
1072 setprocset(&set, POP_AND, P_PGID, -pid, P_ALL, P_MYID);
1073 (void) sigsendset(&set, &v);
1074 }
1075
1076 static int
1077 makemsg(ssize_t count, struct uio *uiop, struct pty *pty, mblk_t **mpp)
1078 {
1079 int pri = BPRI_LO;
1080 int error;
1081 mblk_t *bp = NULL;
1082
1083 ASSERT(MUTEX_HELD(&pty->ptc_lock));
1084
1085 *mpp = NULL;
1086
1087 /*
1088 * Create data part of message, if any.
1089 */
1090 if (count >= 0) {
1091 if ((bp = allocb(count, pri)) == NULL)
1092 return (ENOSR);
1093
1094 mutex_exit(&pty->ptc_lock);
1095 error = uiomove((caddr_t)bp->b_wptr, count, UIO_WRITE, uiop);
1096 mutex_enter(&pty->ptc_lock);
1097 if (error) {
1098 freeb(bp);
1099 return (error);
1100 }
1101
1102 bp->b_wptr += count;
1103 }
1104
1105 *mpp = bp;
1106 return (0);
1107 }