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bmake-ify mega_sas
[unleashed.git] / usr / src / uts / common / io / tty_pty.c
blob935c266f123f208031b36c52b8679c6275101baa
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-tty" device. For each "controller" side
15 * it connects to a "slave" 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> /* 1/0 on the vomit meter */
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 NULL, /* 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, /* Type of module. This one is a pseudo driver */
120 "tty pseudo driver control 'ptc'",
121 &ptc_ops, /* driver 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 = 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 = NULL;
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 * Controller 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 /*ARGSUSED*/
245 int
246 ptcopen(dev_t *devp, int flag, int otyp, struct cred *cred)
247 {
248 dev_t dev = *devp;
249 struct pty *pty;
250 queue_t *q;
251
252 if (getminor(dev) >= npty) {
253 return (ENXIO);
254 }
255 pty = &pty_softc[getminor(dev)];
256 mutex_enter(&pty->ptc_lock);
257 if (pty->pt_flags & PF_CARR_ON) {
258 mutex_exit(&pty->ptc_lock);
259 return (EIO); /* controller is exclusive use */
260 /* XXX - should be EBUSY! */
261 }
262 if (pty->pt_flags & PF_WOPEN) {
263 pty->pt_flags &= ~PF_WOPEN;
264 cv_broadcast(&pty->pt_cv_flags);
265 }
266
267 if ((q = pty->pt_ttycommon.t_readq) != NULL) {
268 /*
269 * Send an un-hangup to the slave, since "carrier" is
270 * coming back up. Make sure we're doing canonicalization.
271 */
272 (void) putctl(q, M_UNHANGUP);
273 (void) putctl1(q, M_CTL, MC_DOCANON);
274 }
275 pty->pt_flags |= PF_CARR_ON;
276 pty->pt_send = 0;
277 pty->pt_ucntl = 0;
278
279 mutex_exit(&pty->ptc_lock);
280 return (0);
281 }
282
283 /*ARGSUSED1*/
284 int
285 ptcclose(dev_t dev, int flag, int otyp, struct cred *cred)
286 {
287 struct pty *pty;
288 mblk_t *bp;
289 queue_t *q;
290
291 pty = &pty_softc[getminor(dev)];
292
293 mutex_enter(&pty->ptc_lock);
294 if ((q = pty->pt_ttycommon.t_readq) != NULL) {
295 /*
296 * Send a hangup to the slave, since "carrier" is dropping.
297 */
298 (void) putctl(q, M_HANGUP);
299 }
300
301 /*
302 * Clear out all the controller-side state. This also
303 * clears PF_CARR_ON, which is correct because the
304 * "carrier" is dropping since the controller process
305 * is going away.
306 */
307 pty->pt_flags &= (PF_WOPEN|PF_STOPPED|PF_NOSTOP);
308 while ((bp = pty->pt_stuffqfirst) != NULL) {
309 if ((pty->pt_stuffqfirst = bp->b_next) == NULL)
310 pty->pt_stuffqlast = NULL;
311 else
312 pty->pt_stuffqfirst->b_prev = NULL;
313 pty->pt_stuffqlen--;
314 bp->b_next = bp->b_prev = NULL;
315 freemsg(bp);
316 }
317 mutex_exit(&pty->ptc_lock);
318 return (0);
319 }
320
321 int
322 ptcread(dev_t dev, struct uio *uio, struct cred *cred)
323 {
324 struct pty *pty = &pty_softc[getminor(dev)];
325 mblk_t *bp, *nbp;
326 queue_t *q;
327 unsigned char tmp;
328 ssize_t cc;
329 int error;
330 off_t off;
331
332
333 off = uio->uio_offset;
334
335 mutex_enter(&pty->ptc_lock);
336
337 for (;;) {
338 while (pty->pt_flags & PF_READ) {
339 pty->pt_flags |= PF_WREAD;
340 cv_wait(&pty->pt_cv_flags, &pty->ptc_lock);
341 }
342 pty->pt_flags |= PF_READ;
343
344 /*
345 * If there's a TIOCPKT packet waiting, pass it back.
346 */
347 while (pty->pt_flags&(PF_PKT|PF_UCNTL) && pty->pt_send) {
348 tmp = pty->pt_send;
349 pty->pt_send = 0;
350 mutex_exit(&pty->ptc_lock);
351 error = ureadc((int)tmp, uio);
352 uio->uio_offset = off;
353 mutex_enter(&pty->ptc_lock);
354 if (error) {
355 pty->pt_send |= tmp;
356 goto out;
357 }
358 if (pty->pt_send == 0)
359 goto out;
360 }
361
362 /*
363 * If there's a user-control packet waiting, pass the
364 * "ioctl" code back.
365 */
366 while ((pty->pt_flags & (PF_UCNTL|PF_43UCNTL)) &&
367 pty->pt_ucntl) {
368 tmp = pty->pt_ucntl;
369 pty->pt_ucntl = 0;
370 mutex_exit(&pty->ptc_lock);
371 error = ureadc((int)tmp, uio);
372 uio->uio_offset = off;
373 mutex_enter(&pty->ptc_lock);
374 if (error) {
375 if (pty->pt_ucntl == 0)
376 pty->pt_ucntl = tmp;
377 goto out;
378 }
379 if (pty->pt_ucntl == 0)
380 goto out;
381 }
382
383 /*
384 * If there's any data waiting, pass it back.
385 */
386 if ((q = pty->pt_ttycommon.t_writeq) != NULL &&
387 q->q_first != NULL &&
388 !(pty->pt_flags & PF_STOPPED)) {
389 if (pty->pt_flags & (PF_PKT|PF_UCNTL|PF_43UCNTL)) {
390 /*
391 * We're about to begin a move in packet or
392 * user-control mode; precede the data with a
393 * data header.
394 */
395 mutex_exit(&pty->ptc_lock);
396 error = ureadc(TIOCPKT_DATA, uio);
397 uio->uio_offset = off;
398 mutex_enter(&pty->ptc_lock);
399 if (error != 0)
400 goto out;
401 if ((q = pty->pt_ttycommon.t_writeq) == NULL)
402 goto out;
403 }
404 if ((bp = getq(q)) == NULL)
405 goto out;
406 while (uio->uio_resid > 0) {
407 while ((cc = bp->b_wptr - bp->b_rptr) == 0) {
408 nbp = bp->b_cont;
409 freeb(bp);
410 if ((bp = nbp) == NULL) {
411 if ((q == NULL) ||
412 (bp = getq(q)) == NULL)
413 goto out;
414 }
415 }
416 cc = MIN(cc, uio->uio_resid);
417 mutex_exit(&pty->ptc_lock);
418 error = uiomove((caddr_t)bp->b_rptr,
419 cc, UIO_READ, uio);
420 uio->uio_offset = off;
421 mutex_enter(&pty->ptc_lock);
422 if (error != 0) {
423 freemsg(bp);
424 goto out;
425 }
426 q = pty->pt_ttycommon.t_writeq;
427 bp->b_rptr += cc;
428 }
429 /*
430 * Strip off zero-length blocks from the front of
431 * what we're putting back on the queue.
432 */
433 while ((bp->b_wptr - bp->b_rptr) == 0) {
434 nbp = bp->b_cont;
435 freeb(bp);
436 if ((bp = nbp) == NULL)
437 goto out; /* nothing left */
438 }
439 if (q != NULL)
440 (void) putbq(q, bp);
441 else
442 freemsg(bp);
443 goto out;
444 }
445
446 /*
447 * If there's any TIOCSTI-stuffed characters, pass
448 * them back. (They currently arrive after all output;
449 * is this correct?)
450 */
451 if (pty->pt_flags&PF_UCNTL && pty->pt_stuffqfirst != NULL) {
452 mutex_exit(&pty->ptc_lock);
453 error = ureadc(TIOCSTI&0xff, uio);
454 mutex_enter(&pty->ptc_lock);
455 while (error == 0 &&
456 (bp = pty->pt_stuffqfirst) != NULL &&
457 uio->uio_resid > 0) {
458 pty->pt_stuffqlen--;
459 if ((pty->pt_stuffqfirst = bp->b_next) == NULL)
460 pty->pt_stuffqlast = NULL;
461 else
462 pty->pt_stuffqfirst->b_prev = NULL;
463 mutex_exit(&pty->ptc_lock);
464 error = ureadc((int)*bp->b_rptr, uio);
465 bp->b_next = bp->b_prev = NULL;
466 freemsg(bp);
467 mutex_enter(&pty->ptc_lock);
468 }
469 uio->uio_offset = off;
470 goto out;
471 }
472
473 /*
474 * There's no data available.
475 * We want to block until the slave is open, and there's
476 * something to read; but if we lost the slave or we're NBIO,
477 * then return the appropriate error instead. POSIX-style
478 * non-block has top billing and gives -1 with errno = EAGAIN,
479 * BSD-style comes next and gives -1 with errno = EWOULDBLOCK,
480 * SVID-style comes last and gives 0.
481 */
482 if (pty->pt_flags & PF_SLAVEGONE) {
483 error = EIO;
484 goto out;
485 }
486 if (uio->uio_fmode & FNONBLOCK) {
487 error = EAGAIN;
488 goto out;
489 }
490 if (pty->pt_flags & PF_NBIO) {
491 error = EWOULDBLOCK;
492 goto out;
493 }
494 if (uio->uio_fmode & FNDELAY)
495 goto out;
496
497 if (pty->pt_flags & PF_WREAD)
498 cv_broadcast(&pty->pt_cv_flags);
499
500 pty->pt_flags &= ~(PF_READ | PF_WREAD);
501
502
503 if (!cv_wait_sig(&pty->pt_cv_writeq, &pty->ptc_lock)) {
504 mutex_exit(&pty->ptc_lock);
505 return (EINTR);
506 }
507 }
508
509 out:
510 if (pty->pt_flags & PF_WREAD)
511 cv_broadcast(&pty->pt_cv_flags);
512
513 pty->pt_flags &= ~(PF_READ | PF_WREAD);
514
515 mutex_exit(&pty->ptc_lock);
516 return (error);
517 }
518
519 int
520 ptcwrite(dev_t dev, struct uio *uio, struct cred *cred)
521 {
522 struct pty *pty = &pty_softc[getminor(dev)];
523 queue_t *q;
524 int written;
525 mblk_t *mp;
526 int fmode = 0;
527 int error = 0;
528
529 off_t off;
530 off = uio->uio_offset;
531
532
533
534 mutex_enter(&pty->ptc_lock);
535
536 again:
537 while (pty->pt_flags & PF_WRITE) {
538 pty->pt_flags |= PF_WWRITE;
539 cv_wait(&pty->pt_cv_flags, &pty->ptc_lock);
540 }
541
542 pty->pt_flags |= PF_WRITE;
543
544 if ((q = pty->pt_ttycommon.t_readq) == NULL) {
545
546 /*
547 * Wait for slave to open.
548 */
549 if (pty->pt_flags & PF_SLAVEGONE) {
550 error = EIO;
551 goto out;
552 }
553 if (uio->uio_fmode & FNONBLOCK) {
554 error = EAGAIN;
555 goto out;
556 }
557 if (pty->pt_flags & PF_NBIO) {
558 error = EWOULDBLOCK;
559 goto out;
560 }
561 if (uio->uio_fmode & FNDELAY)
562 goto out;
563
564 if (pty->pt_flags & PF_WWRITE)
565 cv_broadcast(&pty->pt_cv_flags);
566
567 pty->pt_flags &= ~(PF_WRITE | PF_WWRITE);
568
569 if (!cv_wait_sig(&pty->pt_cv_readq, &pty->ptc_lock)) {
570 mutex_exit(&pty->ptc_lock);
571 return (EINTR);
572 }
573
574 goto again;
575 }
576
577 /*
578 * If in remote mode, even zero-length writes generate messages.
579 */
580 written = 0;
581 if ((pty->pt_flags & PF_REMOTE) || uio->uio_resid > 0) {
582 do {
583 while (!canput(q)) {
584 /*
585 * Wait for slave's read queue to unclog.
586 */
587 if (pty->pt_flags & PF_SLAVEGONE) {
588 error = EIO;
589 goto out;
590 }
591 if (uio->uio_fmode & FNONBLOCK) {
592 if (!written)
593 error = EAGAIN;
594 goto out;
595 }
596 if (pty->pt_flags & PF_NBIO) {
597 if (!written)
598 error = EWOULDBLOCK;
599 goto out;
600 }
601 if (uio->uio_fmode & FNDELAY)
602 goto out;
603
604 if (pty->pt_flags & PF_WWRITE)
605 cv_broadcast(&pty->pt_cv_flags);
606
607 pty->pt_flags &= ~(PF_WRITE | PF_WWRITE);
608
609 if (!cv_wait_sig(&pty->pt_cv_readq,
610 &pty->ptc_lock)) {
611 mutex_exit(&pty->ptc_lock);
612 return (EINTR);
613 }
614
615 while (pty->pt_flags & PF_WRITE) {
616 pty->pt_flags |= PF_WWRITE;
617 cv_wait(&pty->pt_cv_flags,
618 &pty->ptc_lock);
619 }
620
621 pty->pt_flags |= PF_WRITE;
622 }
623
624 if ((pty->pt_flags & PF_NBIO) &&
625 !(uio->uio_fmode & FNONBLOCK)) {
626 fmode = uio->uio_fmode;
627 uio->uio_fmode |= FNONBLOCK;
628 }
629
630 error = makemsg(uio->uio_resid, uio, pty, &mp);
631 uio->uio_offset = off;
632 if (fmode)
633 uio->uio_fmode = fmode;
634 if (error != 0) {
635 if (error != EAGAIN && error != EWOULDBLOCK)
636 goto out;
637 if (uio->uio_fmode & FNONBLOCK) {
638 if (!written)
639 error = EAGAIN;
640 goto out;
641 }
642 if (pty->pt_flags & PF_NBIO) {
643 if (!written)
644 error = EWOULDBLOCK;
645 goto out;
646 }
647 if (uio->uio_fmode & FNDELAY)
648 goto out;
649 cmn_err(CE_PANIC,
650 "ptcwrite: non null return from"
651 " makemsg");
652 }
653
654 /*
655 * Check again for safety; since "uiomove" can take a
656 * page fault, there's no guarantee that "pt_flags"
657 * didn't change while it was happening.
658 */
659 if ((q = pty->pt_ttycommon.t_readq) == NULL) {
660 if (mp)
661 freemsg(mp);
662 error = EIO;
663 goto out;
664 }
665 if (mp)
666 (void) putq(q, mp);
667 written = 1;
668 } while (uio->uio_resid > 0);
669 }
670 out:
671 if (pty->pt_flags & PF_WWRITE)
672 cv_broadcast(&pty->pt_cv_flags);
673
674 pty->pt_flags &= ~(PF_WRITE | PF_WWRITE);
675
676 mutex_exit(&pty->ptc_lock);
677 return (error);
678 }
679
680 #define copy_in(data, d_arg) \
681 if (copyin((caddr_t)data, &d_arg, sizeof (int)) != 0) \
682 return (EFAULT)
683
684 #define copy_out(d_arg, data) \
685 if (copyout(&d_arg, (caddr_t)data, sizeof (int)) != 0) \
686 return (EFAULT)
687
688 int
689 ptcioctl(dev_t dev, int cmd, intptr_t data, int flag, struct cred *cred,
690 int *rvalp)
691 {
692 struct pty *pty = &pty_softc[getminor(dev)];
693 queue_t *q;
694 struct ttysize tty_arg;
695 struct winsize win_arg;
696 int d_arg;
697 int err;
698
699 switch (cmd) {
700
701 case TIOCPKT:
702 copy_in(data, d_arg);
703 mutex_enter(&pty->ptc_lock);
704 if (d_arg) {
705 if (pty->pt_flags & (PF_UCNTL|PF_43UCNTL)) {
706 mutex_exit(&pty->ptc_lock);
707 return (EINVAL);
708 }
709 pty->pt_flags |= PF_PKT;
710 } else
711 pty->pt_flags &= ~PF_PKT;
712 mutex_exit(&pty->ptc_lock);
713 break;
714
715 case TIOCUCNTL:
716 copy_in(data, d_arg);
717 mutex_enter(&pty->ptc_lock);
718 if (d_arg) {
719 if (pty->pt_flags & (PF_PKT|PF_UCNTL)) {
720 mutex_exit(&pty->ptc_lock);
721 return (EINVAL);
722 }
723 pty->pt_flags |= PF_43UCNTL;
724 } else
725 pty->pt_flags &= ~PF_43UCNTL;
726 mutex_exit(&pty->ptc_lock);
727 break;
728
729 case TIOCTCNTL:
730 copy_in(data, d_arg);
731 mutex_enter(&pty->ptc_lock);
732 if (d_arg) {
733 if (pty->pt_flags & PF_PKT) {
734 mutex_exit(&pty->ptc_lock);
735 return (EINVAL);
736 }
737 pty->pt_flags |= PF_UCNTL;
738 } else
739 pty->pt_flags &= ~PF_UCNTL;
740 mutex_exit(&pty->ptc_lock);
741 break;
742
743 case TIOCREMOTE:
744 copy_in(data, d_arg);
745 mutex_enter(&pty->ptc_lock);
746 if (d_arg) {
747 if ((q = pty->pt_ttycommon.t_readq) != NULL)
748 (void) putctl1(q, M_CTL, MC_NOCANON);
749 pty->pt_flags |= PF_REMOTE;
750 } else {
751 if ((q = pty->pt_ttycommon.t_readq) != NULL)
752 (void) putctl1(q, M_CTL, MC_DOCANON);
753 pty->pt_flags &= ~PF_REMOTE;
754 }
755 mutex_exit(&pty->ptc_lock);
756 break;
757
758 case TIOCSIGNAL:
759 /*
760 * Blast a M_PCSIG message up the slave stream; the
761 * signal number is the argument to the "ioctl".
762 */
763 copy_in(data, d_arg);
764 mutex_enter(&pty->ptc_lock);
765 if ((q = pty->pt_ttycommon.t_readq) != NULL)
766 (void) putctl1(q, M_PCSIG, (int)d_arg);
767 mutex_exit(&pty->ptc_lock);
768 break;
769
770 case FIONBIO:
771 copy_in(data, d_arg);
772 mutex_enter(&pty->ptc_lock);
773 if (d_arg)
774 pty->pt_flags |= PF_NBIO;
775 else
776 pty->pt_flags &= ~PF_NBIO;
777 mutex_exit(&pty->ptc_lock);
778 break;
779
780 case FIOASYNC:
781 copy_in(data, d_arg);
782 mutex_enter(&pty->ptc_lock);
783 if (d_arg)
784 pty->pt_flags |= PF_ASYNC;
785 else
786 pty->pt_flags &= ~PF_ASYNC;
787 mutex_exit(&pty->ptc_lock);
788 break;
789
790 /*
791 * These, at least, can work on the controller-side process
792 * group.
793 */
794 case FIOGETOWN:
795 mutex_enter(&pty->ptc_lock);
796 d_arg = -pty->pt_pgrp;
797 mutex_exit(&pty->ptc_lock);
798 copy_out(d_arg, data);
799 break;
800
801 case FIOSETOWN:
802 copy_in(data, d_arg);
803 mutex_enter(&pty->ptc_lock);
804 pty->pt_pgrp = (short)(-d_arg);
805 mutex_exit(&pty->ptc_lock);
806 break;
807
808 case FIONREAD: {
809 /*
810 * Return the total number of bytes of data in all messages
811 * in slave write queue, which is master read queue, unless a
812 * special message would be read.
813 */
814 mblk_t *mp;
815 size_t count = 0;
816
817 mutex_enter(&pty->ptc_lock);
818 if (pty->pt_flags&(PF_PKT|PF_UCNTL) && pty->pt_send)
819 count = 1; /* will return 1 byte */
820 else if ((pty->pt_flags & (PF_UCNTL|PF_43UCNTL)) &&
821 pty->pt_ucntl)
822 count = 1; /* will return 1 byte */
823 else if ((q = pty->pt_ttycommon.t_writeq) != NULL &&
824 q->q_first != NULL && !(pty->pt_flags & PF_STOPPED)) {
825 /*
826 * Will return whatever data is queued up.
827 */
828 for (mp = q->q_first; mp != NULL; mp = mp->b_next)
829 count += msgdsize(mp);
830 } else if ((pty->pt_flags & PF_UCNTL) &&
831 pty->pt_stuffqfirst != NULL) {
832 /*
833 * Will return STI'ed data.
834 */
835 count = pty->pt_stuffqlen + 1;
836 }
837
838 /*
839 * Under LP64 we could have more than INT_MAX bytes to report,
840 * but the interface is defined in terms of int, so we cap it.
841 */
842 d_arg = MIN(count, INT_MAX);
843 mutex_exit(&pty->ptc_lock);
844 copy_out(d_arg, data);
845 break;
846 }
847
848 case TIOCSWINSZ:
849 /*
850 * Unfortunately, TIOCSWINSZ and the old TIOCSSIZE "ioctl"s
851 * share the same code. If the upper 16 bits of the number
852 * of lines is non-zero, it was probably a TIOCSWINSZ,
853 * with both "ws_row" and "ws_col" non-zero.
854 */
855 if (copyin((caddr_t)data,
856 &tty_arg, sizeof (struct ttysize)) != 0)
857 return (EFAULT);
858
859 if ((tty_arg.ts_lines & 0xffff0000) != 0) {
860 /*
861 * It's a TIOCSWINSZ.
862 */
863 win_arg = *(struct winsize *)&tty_arg;
864
865 mutex_enter(&pty->ptc_lock);
866 /*
867 * If the window size changed, send a SIGWINCH.
868 */
869 if (bcmp(&pty->pt_ttycommon.t_size,
870 &win_arg, sizeof (struct winsize))) {
871 pty->pt_ttycommon.t_size = win_arg;
872 if ((q = pty->pt_ttycommon.t_readq) != NULL)
873 (void) putctl1(q, M_PCSIG, SIGWINCH);
874 }
875 mutex_exit(&pty->ptc_lock);
876 break;
877 }
878 /* FALLTHROUGH */
879
880 case TIOCSSIZE:
881 if (copyin((caddr_t)data,
882 &tty_arg, sizeof (struct ttysize)) != 0)
883 return (EFAULT);
884 mutex_enter(&pty->ptc_lock);
885 pty->pt_ttycommon.t_size.ws_row = (ushort_t)tty_arg.ts_lines;
886 pty->pt_ttycommon.t_size.ws_col = (ushort_t)tty_arg.ts_cols;
887 pty->pt_ttycommon.t_size.ws_xpixel = 0;
888 pty->pt_ttycommon.t_size.ws_ypixel = 0;
889 mutex_exit(&pty->ptc_lock);
890 break;
891
892 case TIOCGWINSZ:
893 mutex_enter(&pty->ptc_lock);
894 win_arg = pty->pt_ttycommon.t_size;
895 mutex_exit(&pty->ptc_lock);
896 if (copyout(&win_arg, (caddr_t)data,
897 sizeof (struct winsize)) != 0)
898 return (EFAULT);
899 break;
900
901 case TIOCGSIZE:
902 mutex_enter(&pty->ptc_lock);
903 tty_arg.ts_lines = pty->pt_ttycommon.t_size.ws_row;
904 tty_arg.ts_cols = pty->pt_ttycommon.t_size.ws_col;
905 mutex_exit(&pty->ptc_lock);
906 if (copyout(&tty_arg, (caddr_t)data,
907 sizeof (struct ttysize)) != 0)
908 return (EFAULT);
909 break;
910
911 /*
912 * XXX These should not be here. The only reason why an
913 * "ioctl" on the controller side should get the
914 * slave side's process group is so that the process on
915 * the controller side can send a signal to the slave
916 * side's process group; however, this is better done
917 * with TIOCSIGNAL, both because it doesn't require us
918 * to know about the slave side's process group and because
919 * the controller side process may not have permission to
920 * send that signal to the entire process group.
921 *
922 * However, since vanilla 4BSD doesn't provide TIOCSIGNAL,
923 * we can't just get rid of them.
924 */
925 case TIOCGPGRP:
926 case TIOCSPGRP:
927 /*
928 * This is amazingly disgusting, but the stupid semantics of
929 * 4BSD pseudo-ttys makes us do it. If we do one of these guys
930 * on the controller side, it really applies to the slave-side
931 * stream. It should NEVER have been possible to do ANY sort
932 * of tty operations on the controller side, but it's too late
933 * to fix that now. However, we won't waste our time implementing
934 * anything that the original pseudo-tty driver didn't handle.
935 */
936 case TIOCGETP:
937 case TIOCSETP:
938 case TIOCSETN:
939 case TIOCGETC:
940 case TIOCSETC:
941 case TIOCGLTC:
942 case TIOCSLTC:
943 case TIOCLGET:
944 case TIOCLSET:
945 case TIOCLBIS:
946 case TIOCLBIC:
947 mutex_enter(&pty->ptc_lock);
948 if (pty->pt_vnode == NULL) {
949 mutex_exit(&pty->ptc_lock);
950 return (EIO);
951 }
952 pty->pt_flags |= PF_IOCTL;
953 mutex_exit(&pty->ptc_lock);
954 err = strioctl(pty->pt_vnode, cmd, data, flag,
955 U_TO_K, cred, rvalp);
956 mutex_enter(&pty->ptc_lock);
957 if (pty->pt_flags & PF_WAIT)
958 cv_signal(&pty->pt_cv_flags);
959 pty->pt_flags &= ~(PF_IOCTL|PF_WAIT);
960 mutex_exit(&pty->ptc_lock);
961 return (err);
962
963 default:
964 return (ENOTTY);
965 }
966
967 return (0);
968 }
969
970
971 int
972 ptcpoll(dev_t dev,
973 short events,
974 int anyyet,
975 short *reventsp,
976 struct pollhead **phpp)
977 {
978 struct pty *pty = &pty_softc[getminor(dev)];
979 pollhead_t *php = &ptcph;
980 queue_t *q;
981 int pos = 0;
982
983 if (polllock(php, &pty->ptc_lock) != 0) {
984 *reventsp = POLLNVAL;
985 return (0);
986 }
987
988 ASSERT(MUTEX_HELD(&pty->ptc_lock));
989
990 *reventsp = 0;
991 if (pty->pt_flags & PF_SLAVEGONE) {
992 if (events & (POLLIN|POLLRDNORM))
993 *reventsp |= (events & (POLLIN|POLLRDNORM));
994 if (events & (POLLOUT|POLLWRNORM))
995 *reventsp |= (events & (POLLOUT|POLLWRNORM));
996 mutex_exit(&pty->ptc_lock);
997 /*
998 * A non NULL pollhead pointer should be returned in case
999 * user polls for 0 events.
1000 */
1001 *phpp = !anyyet && !*reventsp ? php : NULL;
1002 return (0);
1003 }
1004 if (events & (POLLIN|POLLRDNORM)) {
1005 if ((q = pty->pt_ttycommon.t_writeq) != NULL &&
1006 q->q_first != NULL && !(pty->pt_flags & PF_STOPPED)) {
1007 /*
1008 * Regular data is available.
1009 */
1010 *reventsp |= (events & (POLLIN|POLLRDNORM));
1011 pos++;
1012 }
1013 if (pty->pt_flags & (PF_PKT|PF_UCNTL) && pty->pt_send) {
1014 /*
1015 * A control packet is available.
1016 */
1017 *reventsp |= (events & (POLLIN|POLLRDNORM));
1018 pos++;
1019 }
1020 if ((pty->pt_flags & PF_UCNTL) &&
1021 (pty->pt_ucntl || pty->pt_stuffqfirst != NULL)) {
1022 /*
1023 * "ioctl" or TIOCSTI data is available.
1024 */
1025 *reventsp |= (events & (POLLIN|POLLRDNORM));
1026 pos++;
1027 }
1028 if ((pty->pt_flags & PF_43UCNTL) && pty->pt_ucntl) {
1029 *reventsp |= (events & (POLLIN|POLLRDNORM));
1030 pos++;
1031 }
1032 }
1033 if (events & (POLLOUT|POLLWRNORM)) {
1034 if ((q = pty->pt_ttycommon.t_readq) != NULL &&
1035 canput(q)) {
1036 *reventsp |= (events & (POLLOUT|POLLWRNORM));
1037 pos++;
1038 }
1039 }
1040 if (events & POLLERR) {
1041 *reventsp |= POLLERR;
1042 pos++;
1043 }
1044 if (events == 0) { /* "exceptional conditions" */
1045 if (((pty->pt_flags & (PF_PKT|PF_UCNTL)) && pty->pt_send) ||
1046 ((pty->pt_flags & PF_UCNTL) &&
1047 (pty->pt_ucntl || pty->pt_stuffqfirst != NULL))) {
1048 pos++;
1049 }
1050 if ((pty->pt_flags & PF_43UCNTL) && pty->pt_ucntl) {
1051 pos++;
1052 }
1053 }
1054
1055 /*
1056 * Arrange to have poll waken up when event occurs.
1057 * if (!anyyet)
1058 */
1059 if (!pos) {
1060 *phpp = php;
1061 *reventsp = 0;
1062 }
1063
1064 mutex_exit(&pty->ptc_lock);
1065 return (0);
1066 }
1067
1068 void
1069 gsignal(int pid, int sig)
1070 {
1071 procset_t set;
1072 sigsend_t v;
1073
1074 bzero(&v, sizeof (v));
1075 v.sig = sig;
1076 v.perm = 0;
1077 v.checkperm = 1;
1078 v.value.sival_ptr = NULL;
1079
1080 setprocset(&set, POP_AND, P_PGID, -pid, P_ALL, P_MYID);
1081 (void) sigsendset(&set, &v);
1082 }
1083
1084 static int
1085 makemsg(ssize_t count, struct uio *uiop, struct pty *pty, mblk_t **mpp)
1086 {
1087 int pri = BPRI_LO;
1088 int error;
1089 mblk_t *bp = NULL;
1090
1091 ASSERT(MUTEX_HELD(&pty->ptc_lock));
1092
1093 *mpp = NULL;
1094
1095 /*
1096 * Create data part of message, if any.
1097 */
1098 if (count >= 0) {
1099 if ((bp = allocb(count, pri)) == NULL)
1100 return (ENOSR);
1101
1102 mutex_exit(&pty->ptc_lock);
1103 error = uiomove((caddr_t)bp->b_wptr, count, UIO_WRITE, uiop);
1104 mutex_enter(&pty->ptc_lock);
1105 if (error) {
1106 freeb(bp);
1107 return (error);
1108 }
1109
1110 bp->b_wptr += count;
1111 }
1112
1113 *mpp = bp;
1114 return (0);
1115 }
Unleashed OS