1 /*
2 * Copyright (c) 1990, 1993, 1995
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 * @(#)fifo_vnops.c 8.10 (Berkeley) 5/27/95
30 * $FreeBSD: releng/5.3/sys/fs/fifofs/fifo_vnops.c 133741 2004-08-15 06:24:42Z jmg $
31 */
32
33 #include <sys/param.h>
34 #include <sys/event.h>
35 #include <sys/filio.h>
36 #include <sys/fcntl.h>
37 #include <sys/file.h>
38 #include <sys/kernel.h>
39 #include <sys/lock.h>
40 #include <sys/mutex.h>
41 #include <sys/malloc.h>
42 #include <sys/poll.h>
43 #include <sys/proc.h> /* XXXKSE */
44 #include <sys/signalvar.h>
45 #include <sys/socket.h>
46 #include <sys/socketvar.h>
47 #include <sys/sx.h>
48 #include <sys/systm.h>
49 #include <sys/un.h>
50 #include <sys/unistd.h>
51 #include <sys/vnode.h>
52 #include <fs/fifofs/fifo.h>
53
54 /*
55 * This structure is associated with the FIFO vnode and stores
56 * the state associated with the FIFO.
57 */
58 struct fifoinfo {
59 struct socket *fi_readsock;
60 struct socket *fi_writesock;
61 long fi_readers;
62 long fi_writers;
63 };
64
65 static int fifo_print(struct vop_print_args *);
66 static int fifo_lookup(struct vop_lookup_args *);
67 static int fifo_open(struct vop_open_args *);
68 static int fifo_close(struct vop_close_args *);
69 static int fifo_read(struct vop_read_args *);
70 static int fifo_write(struct vop_write_args *);
71 static int fifo_ioctl(struct vop_ioctl_args *);
72 static int fifo_poll(struct vop_poll_args *);
73 static int fifo_kqfilter(struct vop_kqfilter_args *);
74 static int fifo_pathconf(struct vop_pathconf_args *);
75 static int fifo_advlock(struct vop_advlock_args *);
76
77 static void filt_fifordetach(struct knote *kn);
78 static int filt_fiforead(struct knote *kn, long hint);
79 static void filt_fifowdetach(struct knote *kn);
80 static int filt_fifowrite(struct knote *kn, long hint);
81
82 static struct filterops fiforead_filtops =
83 { 1, NULL, filt_fifordetach, filt_fiforead };
84 static struct filterops fifowrite_filtops =
85 { 1, NULL, filt_fifowdetach, filt_fifowrite };
86
87 vop_t **fifo_vnodeop_p;
88 static struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
89 { &vop_default_desc, (vop_t *) vop_defaultop },
90 { &vop_access_desc, (vop_t *) vop_ebadf },
91 { &vop_advlock_desc, (vop_t *) fifo_advlock },
92 { &vop_close_desc, (vop_t *) fifo_close },
93 { &vop_create_desc, (vop_t *) vop_panic },
94 { &vop_getattr_desc, (vop_t *) vop_ebadf },
95 { &vop_getwritemount_desc, (vop_t *) vop_stdgetwritemount },
96 { &vop_ioctl_desc, (vop_t *) fifo_ioctl },
97 { &vop_kqfilter_desc, (vop_t *) fifo_kqfilter },
98 { &vop_lease_desc, (vop_t *) vop_null },
99 { &vop_link_desc, (vop_t *) vop_panic },
100 { &vop_lookup_desc, (vop_t *) fifo_lookup },
101 { &vop_mkdir_desc, (vop_t *) vop_panic },
102 { &vop_mknod_desc, (vop_t *) vop_panic },
103 { &vop_open_desc, (vop_t *) fifo_open },
104 { &vop_pathconf_desc, (vop_t *) fifo_pathconf },
105 { &vop_poll_desc, (vop_t *) fifo_poll },
106 { &vop_print_desc, (vop_t *) fifo_print },
107 { &vop_read_desc, (vop_t *) fifo_read },
108 { &vop_readdir_desc, (vop_t *) vop_panic },
109 { &vop_readlink_desc, (vop_t *) vop_panic },
110 { &vop_reallocblks_desc, (vop_t *) vop_panic },
111 { &vop_reclaim_desc, (vop_t *) vop_null },
112 { &vop_remove_desc, (vop_t *) vop_panic },
113 { &vop_rename_desc, (vop_t *) vop_panic },
114 { &vop_rmdir_desc, (vop_t *) vop_panic },
115 { &vop_setattr_desc, (vop_t *) vop_ebadf },
116 { &vop_symlink_desc, (vop_t *) vop_panic },
117 { &vop_write_desc, (vop_t *) fifo_write },
118 { NULL, NULL }
119 };
120 static struct vnodeopv_desc fifo_vnodeop_opv_desc =
121 { &fifo_vnodeop_p, fifo_vnodeop_entries };
122
123 VNODEOP_SET(fifo_vnodeop_opv_desc);
124
125 struct mtx fifo_mtx;
126 MTX_SYSINIT(fifo, &fifo_mtx, "fifo mutex", MTX_DEF);
127
128 int
129 fifo_vnoperate(ap)
130 struct vop_generic_args /* {
131 struct vnodeop_desc *a_desc;
132 <other random data follows, presumably>
133 } */ *ap;
134 {
135 return (VOCALL(fifo_vnodeop_p, ap->a_desc->vdesc_offset, ap));
136 }
137
138 /*
139 * Trivial lookup routine that always fails.
140 */
141 /* ARGSUSED */
142 static int
143 fifo_lookup(ap)
144 struct vop_lookup_args /* {
145 struct vnode * a_dvp;
146 struct vnode ** a_vpp;
147 struct componentname * a_cnp;
148 } */ *ap;
149 {
150
151 *ap->a_vpp = NULL;
152 return (ENOTDIR);
153 }
154
155 /*
156 * Dispose of fifo resources.
157 */
158 static void
159 fifo_cleanup(struct vnode *vp)
160 {
161 struct fifoinfo *fip = vp->v_fifoinfo;
162
163 ASSERT_VOP_LOCKED(vp, "fifo_cleanup");
164 if (fip->fi_readers == 0 && fip->fi_writers == 0) {
165 vp->v_fifoinfo = NULL;
166 (void)soclose(fip->fi_readsock);
167 (void)soclose(fip->fi_writesock);
168 FREE(fip, M_VNODE);
169 }
170 }
171
172 /*
173 * Open called to set up a new instance of a fifo or
174 * to find an active instance of a fifo.
175 */
176 /* ARGSUSED */
177 static int
178 fifo_open(ap)
179 struct vop_open_args /* {
180 struct vnode *a_vp;
181 int a_mode;
182 struct ucred *a_cred;
183 struct thread *a_td;
184 } */ *ap;
185 {
186 struct vnode *vp = ap->a_vp;
187 struct fifoinfo *fip;
188 struct thread *td = ap->a_td;
189 struct ucred *cred = ap->a_cred;
190 struct socket *rso, *wso;
191 int error;
192
193 if ((fip = vp->v_fifoinfo) == NULL) {
194 MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK);
195 error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, cred, td);
196 if (error)
197 goto fail1;
198 fip->fi_readsock = rso;
199 error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, cred, td);
200 if (error)
201 goto fail2;
202 fip->fi_writesock = wso;
203 error = uipc_connect2(wso, rso);
204 if (error) {
205 (void)soclose(wso);
206 fail2:
207 (void)soclose(rso);
208 fail1:
209 free(fip, M_VNODE);
210 return (error);
211 }
212 fip->fi_readers = fip->fi_writers = 0;
213 wso->so_snd.sb_lowat = PIPE_BUF;
214 SOCKBUF_LOCK(&rso->so_rcv);
215 rso->so_rcv.sb_state |= SBS_CANTRCVMORE;
216 SOCKBUF_UNLOCK(&rso->so_rcv);
217 vp->v_fifoinfo = fip;
218 }
219
220 /*
221 * General access to fi_readers and fi_writers is protected using
222 * the vnode lock.
223 *
224 * Protect the increment of fi_readers and fi_writers and the
225 * associated calls to wakeup() with the fifo mutex in addition
226 * to the vnode lock. This allows the vnode lock to be dropped
227 * for the msleep() calls below, and using the fifo mutex with
228 * msleep() prevents the wakeup from being missed.
229 */
230 mtx_lock(&fifo_mtx);
231 if (ap->a_mode & FREAD) {
232 fip->fi_readers++;
233 if (fip->fi_readers == 1) {
234 SOCKBUF_LOCK(&fip->fi_writesock->so_snd);
235 fip->fi_writesock->so_snd.sb_state &= ~SBS_CANTSENDMORE;
236 SOCKBUF_UNLOCK(&fip->fi_writesock->so_snd);
237 if (fip->fi_writers > 0) {
238 wakeup(&fip->fi_writers);
239 sowwakeup(fip->fi_writesock);
240 }
241 }
242 }
243 if (ap->a_mode & FWRITE) {
244 if ((ap->a_mode & O_NONBLOCK) && fip->fi_readers == 0) {
245 mtx_unlock(&fifo_mtx);
246 return (ENXIO);
247 }
248 fip->fi_writers++;
249 if (fip->fi_writers == 1) {
250 SOCKBUF_LOCK(&fip->fi_writesock->so_rcv);
251 fip->fi_readsock->so_rcv.sb_state &= ~SBS_CANTRCVMORE;
252 SOCKBUF_UNLOCK(&fip->fi_writesock->so_rcv);
253 if (fip->fi_readers > 0) {
254 wakeup(&fip->fi_readers);
255 sorwakeup(fip->fi_writesock);
256 }
257 }
258 }
259 if ((ap->a_mode & O_NONBLOCK) == 0) {
260 if ((ap->a_mode & FREAD) && fip->fi_writers == 0) {
261 VOP_UNLOCK(vp, 0, td);
262 error = msleep(&fip->fi_readers, &fifo_mtx,
263 PDROP | PCATCH | PSOCK, "fifoor", 0);
264 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
265 if (error) {
266 fip->fi_readers--;
267 if (fip->fi_readers == 0) {
268 socantsendmore(fip->fi_writesock);
269 fifo_cleanup(vp);
270 }
271 return (error);
272 }
273 mtx_lock(&fifo_mtx);
274 /*
275 * We must have got woken up because we had a writer.
276 * That (and not still having one) is the condition
277 * that we must wait for.
278 */
279 }
280 if ((ap->a_mode & FWRITE) && fip->fi_readers == 0) {
281 VOP_UNLOCK(vp, 0, td);
282 error = msleep(&fip->fi_writers, &fifo_mtx,
283 PDROP | PCATCH | PSOCK, "fifoow", 0);
284 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
285 if (error) {
286 fip->fi_writers--;
287 if (fip->fi_writers == 0) {
288 socantrcvmore(fip->fi_readsock);
289 fifo_cleanup(vp);
290 }
291 return (error);
292 }
293 /*
294 * We must have got woken up because we had
295 * a reader. That (and not still having one)
296 * is the condition that we must wait for.
297 */
298 return (0);
299 }
300 }
301 mtx_unlock(&fifo_mtx);
302 return (0);
303 }
304
305 /*
306 * Vnode op for read
307 */
308 /* ARGSUSED */
309 static int
310 fifo_read(ap)
311 struct vop_read_args /* {
312 struct vnode *a_vp;
313 struct uio *a_uio;
314 int a_ioflag;
315 struct ucred *a_cred;
316 } */ *ap;
317 {
318 struct uio *uio = ap->a_uio;
319 struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
320 struct thread *td = uio->uio_td;
321 int error, flags;
322
323 #ifdef DIAGNOSTIC
324 if (uio->uio_rw != UIO_READ)
325 panic("fifo_read mode");
326 #endif
327 if (uio->uio_resid == 0)
328 return (0);
329 VOP_UNLOCK(ap->a_vp, 0, td);
330 flags = (ap->a_ioflag & IO_NDELAY) ? MSG_NBIO : 0;
331 error = soreceive(rso, (struct sockaddr **)0, uio, (struct mbuf **)0,
332 (struct mbuf **)0, &flags);
333 vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, td);
334 return (error);
335 }
336
337 /*
338 * Vnode op for write
339 */
340 /* ARGSUSED */
341 static int
342 fifo_write(ap)
343 struct vop_write_args /* {
344 struct vnode *a_vp;
345 struct uio *a_uio;
346 int a_ioflag;
347 struct ucred *a_cred;
348 } */ *ap;
349 {
350 struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock;
351 struct thread *td = ap->a_uio->uio_td;
352 int error, flags;
353
354 #ifdef DIAGNOSTIC
355 if (ap->a_uio->uio_rw != UIO_WRITE)
356 panic("fifo_write mode");
357 #endif
358 VOP_UNLOCK(ap->a_vp, 0, td);
359 flags = (ap->a_ioflag & IO_NDELAY) ? MSG_NBIO : 0;
360 error = sosend(wso, (struct sockaddr *)0, ap->a_uio, 0,
361 (struct mbuf *)0, flags, td);
362 vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, td);
363 return (error);
364 }
365
366 /*
367 * Device ioctl operation.
368 */
369 /* ARGSUSED */
370 static int
371 fifo_ioctl(ap)
372 struct vop_ioctl_args /* {
373 struct vnode *a_vp;
374 u_long a_command;
375 caddr_t a_data;
376 int a_fflag;
377 struct ucred *a_cred;
378 struct thread *a_td;
379 } */ *ap;
380 {
381 struct file filetmp; /* Local, so need not be locked. */
382 int error;
383
384 if (ap->a_command == FIONBIO)
385 return (0);
386 if (ap->a_fflag & FREAD) {
387 filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock;
388 filetmp.f_cred = ap->a_cred;
389 error = soo_ioctl(&filetmp, ap->a_command, ap->a_data,
390 ap->a_td->td_ucred, ap->a_td);
391 if (error)
392 return (error);
393 }
394 if (ap->a_fflag & FWRITE) {
395 filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock;
396 filetmp.f_cred = ap->a_cred;
397 error = soo_ioctl(&filetmp, ap->a_command, ap->a_data,
398 ap->a_td->td_ucred, ap->a_td);
399 if (error)
400 return (error);
401 }
402 return (0);
403 }
404
405 /* ARGSUSED */
406 static int
407 fifo_kqfilter(ap)
408 struct vop_kqfilter_args /* {
409 struct vnode *a_vp;
410 struct knote *a_kn;
411 } */ *ap;
412 {
413 struct fifoinfo *fi = ap->a_vp->v_fifoinfo;
414 struct socket *so;
415 struct sockbuf *sb;
416
417 switch (ap->a_kn->kn_filter) {
418 case EVFILT_READ:
419 ap->a_kn->kn_fop = &fiforead_filtops;
420 so = fi->fi_readsock;
421 sb = &so->so_rcv;
422 break;
423 case EVFILT_WRITE:
424 ap->a_kn->kn_fop = &fifowrite_filtops;
425 so = fi->fi_writesock;
426 sb = &so->so_snd;
427 break;
428 default:
429 return (1);
430 }
431
432 ap->a_kn->kn_hook = (caddr_t)so;
433
434 SOCKBUF_LOCK(sb);
435 knlist_add(&sb->sb_sel.si_note, ap->a_kn, 1);
436 sb->sb_flags |= SB_KNOTE;
437 SOCKBUF_UNLOCK(sb);
438
439 return (0);
440 }
441
442 static void
443 filt_fifordetach(struct knote *kn)
444 {
445 struct socket *so = (struct socket *)kn->kn_hook;
446
447 SOCKBUF_LOCK(&so->so_rcv);
448 knlist_remove(&so->so_rcv.sb_sel.si_note, kn, 1);
449 if (knlist_empty(&so->so_rcv.sb_sel.si_note))
450 so->so_rcv.sb_flags &= ~SB_KNOTE;
451 SOCKBUF_UNLOCK(&so->so_rcv);
452 }
453
454 static int
455 filt_fiforead(struct knote *kn, long hint)
456 {
457 struct socket *so = (struct socket *)kn->kn_hook;
458 int need_lock, result;
459
460 need_lock = !SOCKBUF_OWNED(&so->so_rcv);
461 if (need_lock)
462 SOCKBUF_LOCK(&so->so_rcv);
463 kn->kn_data = so->so_rcv.sb_cc;
464 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
465 kn->kn_flags |= EV_EOF;
466 result = 1;
467 } else {
468 kn->kn_flags &= ~EV_EOF;
469 result = (kn->kn_data > 0);
470 }
471 if (need_lock)
472 SOCKBUF_UNLOCK(&so->so_rcv);
473 return (result);
474 }
475
476 static void
477 filt_fifowdetach(struct knote *kn)
478 {
479 struct socket *so = (struct socket *)kn->kn_hook;
480
481 SOCKBUF_LOCK(&so->so_snd);
482 knlist_remove(&so->so_snd.sb_sel.si_note, kn, 1);
483 if (knlist_empty(&so->so_snd.sb_sel.si_note))
484 so->so_snd.sb_flags &= ~SB_KNOTE;
485 SOCKBUF_UNLOCK(&so->so_snd);
486 }
487
488 static int
489 filt_fifowrite(struct knote *kn, long hint)
490 {
491 struct socket *so = (struct socket *)kn->kn_hook;
492 int need_lock, result;
493
494 need_lock = !SOCKBUF_OWNED(&so->so_snd);
495 if (need_lock)
496 SOCKBUF_LOCK(&so->so_snd);
497 kn->kn_data = sbspace(&so->so_snd);
498 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
499 kn->kn_flags |= EV_EOF;
500 result = 1;
501 } else {
502 kn->kn_flags &= ~EV_EOF;
503 result = (kn->kn_data >= so->so_snd.sb_lowat);
504 }
505 if (need_lock)
506 SOCKBUF_UNLOCK(&so->so_snd);
507 return (result);
508 }
509
510 /* ARGSUSED */
511 static int
512 fifo_poll(ap)
513 struct vop_poll_args /* {
514 struct vnode *a_vp;
515 int a_events;
516 struct ucred *a_cred;
517 struct thread *a_td;
518 } */ *ap;
519 {
520 struct file filetmp;
521 int events, revents = 0;
522
523 events = ap->a_events &
524 (POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM | POLLRDBAND);
525 if (events) {
526 /*
527 * If POLLIN or POLLRDNORM is requested and POLLINIGNEOF is
528 * not, then convert the first two to the last one. This
529 * tells the socket poll function to ignore EOF so that we
530 * block if there is no writer (and no data). Callers can
531 * set POLLINIGNEOF to get non-blocking behavior.
532 */
533 if (events & (POLLIN | POLLRDNORM) &&
534 !(events & POLLINIGNEOF)) {
535 events &= ~(POLLIN | POLLRDNORM);
536 events |= POLLINIGNEOF;
537 }
538
539 filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock;
540 filetmp.f_cred = ap->a_cred;
541 if (filetmp.f_data)
542 revents |= soo_poll(&filetmp, events,
543 ap->a_td->td_ucred, ap->a_td);
544
545 /* Reverse the above conversion. */
546 if ((revents & POLLINIGNEOF) &&
547 !(ap->a_events & POLLINIGNEOF)) {
548 revents |= (ap->a_events & (POLLIN | POLLRDNORM));
549 revents &= ~POLLINIGNEOF;
550 }
551 }
552 events = ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND);
553 if (events) {
554 filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock;
555 filetmp.f_cred = ap->a_cred;
556 if (filetmp.f_data) {
557 revents |= soo_poll(&filetmp, events,
558 ap->a_td->td_ucred, ap->a_td);
559 }
560 }
561 return (revents);
562 }
563
564 /*
565 * Device close routine
566 */
567 /* ARGSUSED */
568 static int
569 fifo_close(ap)
570 struct vop_close_args /* {
571 struct vnode *a_vp;
572 int a_fflag;
573 struct ucred *a_cred;
574 struct thread *a_td;
575 } */ *ap;
576 {
577 struct vnode *vp = ap->a_vp;
578 struct thread *td = ap->a_td;
579 struct fifoinfo *fip = vp->v_fifoinfo;
580
581 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
582
583 if (ap->a_fflag & FREAD) {
584 fip->fi_readers--;
585 if (fip->fi_readers == 0)
586 socantsendmore(fip->fi_writesock);
587 }
588 if (ap->a_fflag & FWRITE) {
589 fip->fi_writers--;
590 if (fip->fi_writers == 0)
591 socantrcvmore(fip->fi_readsock);
592 }
593 fifo_cleanup(vp);
594 VOP_UNLOCK(vp, 0, td);
595 return (0);
596 }
597
598 /*
599 * Print out internal contents of a fifo vnode.
600 */
601 int
602 fifo_printinfo(vp)
603 struct vnode *vp;
604 {
605 register struct fifoinfo *fip = vp->v_fifoinfo;
606
607 printf(", fifo with %ld readers and %ld writers",
608 fip->fi_readers, fip->fi_writers);
609 return (0);
610 }
611
612 /*
613 * Print out the contents of a fifo vnode.
614 */
615 static int
616 fifo_print(ap)
617 struct vop_print_args /* {
618 struct vnode *a_vp;
619 } */ *ap;
620 {
621 fifo_printinfo(ap->a_vp);
622 printf("\n");
623 return (0);
624 }
625
626 /*
627 * Return POSIX pathconf information applicable to fifo's.
628 */
629 static int
630 fifo_pathconf(ap)
631 struct vop_pathconf_args /* {
632 struct vnode *a_vp;
633 int a_name;
634 int *a_retval;
635 } */ *ap;
636 {
637
638 switch (ap->a_name) {
639 case _PC_LINK_MAX:
640 *ap->a_retval = LINK_MAX;
641 return (0);
642 case _PC_PIPE_BUF:
643 *ap->a_retval = PIPE_BUF;
644 return (0);
645 case _PC_CHOWN_RESTRICTED:
646 *ap->a_retval = 1;
647 return (0);
648 default:
649 return (EINVAL);
650 }
651 /* NOTREACHED */
652 }
653
654 /*
655 * Fifo advisory byte-level locks.
656 */
657 /* ARGSUSED */
658 static int
659 fifo_advlock(ap)
660 struct vop_advlock_args /* {
661 struct vnode *a_vp;
662 caddr_t a_id;
663 int a_op;
664 struct flock *a_fl;
665 int a_flags;
666 } */ *ap;
667 {
668
669 return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL);
670 }
Cache object: 8dcc8e3d6f9bea1d567a25105dd40f59
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