1 /*-
2 * Copyright (c) 1990, 1993, 1995
3 * The Regents of the University of California.
4 * Copyright (c) 2005 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 4. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)fifo_vnops.c 8.10 (Berkeley) 5/27/95
32 * $FreeBSD: releng/9.0/sys/fs/fifofs/fifo_vnops.c 224914 2011-08-16 20:07:47Z kib $
33 */
34
35 #include <sys/param.h>
36 #include <sys/event.h>
37 #include <sys/file.h>
38 #include <sys/filedesc.h>
39 #include <sys/filio.h>
40 #include <sys/fcntl.h>
41 #include <sys/kernel.h>
42 #include <sys/lock.h>
43 #include <sys/mutex.h>
44 #include <sys/malloc.h>
45 #include <sys/poll.h>
46 #include <sys/proc.h>
47 #include <sys/signalvar.h>
48 #include <sys/socket.h>
49 #include <sys/socketvar.h>
50 #include <sys/sx.h>
51 #include <sys/systm.h>
52 #include <sys/un.h>
53 #include <sys/unistd.h>
54 #include <sys/vnode.h>
55 #include <fs/fifofs/fifo.h>
56
57 static fo_rdwr_t fifo_read_f;
58 static fo_rdwr_t fifo_write_f;
59 static fo_ioctl_t fifo_ioctl_f;
60 static fo_poll_t fifo_poll_f;
61 static fo_kqfilter_t fifo_kqfilter_f;
62 static fo_stat_t fifo_stat_f;
63 static fo_close_t fifo_close_f;
64 static fo_truncate_t fifo_truncate_f;
65
66 struct fileops fifo_ops_f = {
67 .fo_read = fifo_read_f,
68 .fo_write = fifo_write_f,
69 .fo_truncate = fifo_truncate_f,
70 .fo_ioctl = fifo_ioctl_f,
71 .fo_poll = fifo_poll_f,
72 .fo_kqfilter = fifo_kqfilter_f,
73 .fo_stat = fifo_stat_f,
74 .fo_close = fifo_close_f,
75 .fo_chmod = vn_chmod,
76 .fo_chown = vn_chown,
77 .fo_flags = DFLAG_PASSABLE
78 };
79
80 /*
81 * This structure is associated with the FIFO vnode and stores
82 * the state associated with the FIFO.
83 * Notes about locking:
84 * - fi_readsock and fi_writesock are invariant since init time.
85 * - fi_readers and fi_writers are vnode lock protected.
86 * - fi_wgen is fif_mtx lock protected.
87 */
88 struct fifoinfo {
89 struct socket *fi_readsock;
90 struct socket *fi_writesock;
91 long fi_readers;
92 long fi_writers;
93 int fi_wgen;
94 };
95
96 static vop_print_t fifo_print;
97 static vop_open_t fifo_open;
98 static vop_close_t fifo_close;
99 static vop_pathconf_t fifo_pathconf;
100 static vop_advlock_t fifo_advlock;
101
102 static void filt_fifordetach(struct knote *kn);
103 static int filt_fiforead(struct knote *kn, long hint);
104 static void filt_fifowdetach(struct knote *kn);
105 static int filt_fifowrite(struct knote *kn, long hint);
106 static void filt_fifodetach_notsup(struct knote *kn);
107 static int filt_fifo_notsup(struct knote *kn, long hint);
108
109 static struct filterops fiforead_filtops = {
110 .f_isfd = 1,
111 .f_detach = filt_fifordetach,
112 .f_event = filt_fiforead,
113 };
114 static struct filterops fifowrite_filtops = {
115 .f_isfd = 1,
116 .f_detach = filt_fifowdetach,
117 .f_event = filt_fifowrite,
118 };
119 static struct filterops fifo_notsup_filtops = {
120 .f_isfd = 1,
121 .f_detach = filt_fifodetach_notsup,
122 .f_event = filt_fifo_notsup,
123 };
124
125 struct vop_vector fifo_specops = {
126 .vop_default = &default_vnodeops,
127
128 .vop_advlock = fifo_advlock,
129 .vop_close = fifo_close,
130 .vop_create = VOP_PANIC,
131 .vop_getattr = VOP_EBADF,
132 .vop_ioctl = VOP_PANIC,
133 .vop_kqfilter = VOP_PANIC,
134 .vop_link = VOP_PANIC,
135 .vop_mkdir = VOP_PANIC,
136 .vop_mknod = VOP_PANIC,
137 .vop_open = fifo_open,
138 .vop_pathconf = fifo_pathconf,
139 .vop_print = fifo_print,
140 .vop_read = VOP_PANIC,
141 .vop_readdir = VOP_PANIC,
142 .vop_readlink = VOP_PANIC,
143 .vop_reallocblks = VOP_PANIC,
144 .vop_reclaim = VOP_NULL,
145 .vop_remove = VOP_PANIC,
146 .vop_rename = VOP_PANIC,
147 .vop_rmdir = VOP_PANIC,
148 .vop_setattr = VOP_EBADF,
149 .vop_symlink = VOP_PANIC,
150 .vop_write = VOP_PANIC,
151 };
152
153 struct mtx fifo_mtx;
154 MTX_SYSINIT(fifo, &fifo_mtx, "fifo mutex", MTX_DEF);
155
156 /*
157 * Dispose of fifo resources.
158 */
159 static void
160 fifo_cleanup(struct vnode *vp)
161 {
162 struct fifoinfo *fip = vp->v_fifoinfo;
163
164 ASSERT_VOP_ELOCKED(vp, "fifo_cleanup");
165 if (fip->fi_readers == 0 && fip->fi_writers == 0) {
166 vp->v_fifoinfo = NULL;
167 (void)soclose(fip->fi_readsock);
168 (void)soclose(fip->fi_writesock);
169 free(fip, M_VNODE);
170 }
171 }
172
173 /*
174 * Open called to set up a new instance of a fifo or
175 * to find an active instance of a fifo.
176 */
177 /* ARGSUSED */
178 static int
179 fifo_open(ap)
180 struct vop_open_args /* {
181 struct vnode *a_vp;
182 int a_mode;
183 struct ucred *a_cred;
184 struct thread *a_td;
185 struct file *a_fp;
186 } */ *ap;
187 {
188 struct vnode *vp = ap->a_vp;
189 struct fifoinfo *fip;
190 struct thread *td = ap->a_td;
191 struct ucred *cred = ap->a_cred;
192 struct file *fp = ap->a_fp;
193 struct socket *rso, *wso;
194 int error;
195
196 ASSERT_VOP_ELOCKED(vp, "fifo_open");
197 if (fp == NULL)
198 return (EINVAL);
199 if ((fip = vp->v_fifoinfo) == NULL) {
200 fip = malloc(sizeof(*fip), M_VNODE, M_WAITOK);
201 error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, cred, td);
202 if (error)
203 goto fail1;
204 fip->fi_readsock = rso;
205 error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, cred, td);
206 if (error)
207 goto fail2;
208 fip->fi_writesock = wso;
209 error = soconnect2(wso, rso);
210 /* Close the direction we do not use, so we can get POLLHUP. */
211 if (error == 0)
212 error = soshutdown(rso, SHUT_WR);
213 if (error) {
214 (void)soclose(wso);
215 fail2:
216 (void)soclose(rso);
217 fail1:
218 free(fip, M_VNODE);
219 return (error);
220 }
221 fip->fi_readers = fip->fi_writers = 0;
222 wso->so_snd.sb_lowat = PIPE_BUF;
223 SOCKBUF_LOCK(&rso->so_rcv);
224 rso->so_rcv.sb_state |= SBS_CANTRCVMORE;
225 SOCKBUF_UNLOCK(&rso->so_rcv);
226 KASSERT(vp->v_fifoinfo == NULL,
227 ("fifo_open: v_fifoinfo race"));
228 vp->v_fifoinfo = fip;
229 }
230
231 /*
232 * Use the fifo_mtx lock here, in addition to the vnode lock,
233 * in order to allow vnode lock dropping before msleep() calls
234 * and still avoiding missed wakeups.
235 */
236 mtx_lock(&fifo_mtx);
237 if (ap->a_mode & FREAD) {
238 fip->fi_readers++;
239 if (fip->fi_readers == 1) {
240 SOCKBUF_LOCK(&fip->fi_writesock->so_snd);
241 fip->fi_writesock->so_snd.sb_state &= ~SBS_CANTSENDMORE;
242 SOCKBUF_UNLOCK(&fip->fi_writesock->so_snd);
243 if (fip->fi_writers > 0) {
244 wakeup(&fip->fi_writers);
245 sowwakeup(fip->fi_writesock);
246 }
247 }
248 fp->f_seqcount = fip->fi_wgen - fip->fi_writers;
249 }
250 if (ap->a_mode & FWRITE) {
251 if ((ap->a_mode & O_NONBLOCK) && fip->fi_readers == 0) {
252 mtx_unlock(&fifo_mtx);
253 if (fip->fi_writers == 0)
254 fifo_cleanup(vp);
255 return (ENXIO);
256 }
257 fip->fi_writers++;
258 if (fip->fi_writers == 1) {
259 SOCKBUF_LOCK(&fip->fi_readsock->so_rcv);
260 fip->fi_readsock->so_rcv.sb_state &= ~SBS_CANTRCVMORE;
261 SOCKBUF_UNLOCK(&fip->fi_readsock->so_rcv);
262 if (fip->fi_readers > 0) {
263 wakeup(&fip->fi_readers);
264 sorwakeup(fip->fi_readsock);
265 }
266 }
267 }
268 if ((ap->a_mode & O_NONBLOCK) == 0) {
269 if ((ap->a_mode & FREAD) && fip->fi_writers == 0) {
270 VOP_UNLOCK(vp, 0);
271 error = msleep(&fip->fi_readers, &fifo_mtx,
272 PDROP | PCATCH | PSOCK, "fifoor", 0);
273 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
274 if (error) {
275 fip->fi_readers--;
276 if (fip->fi_readers == 0) {
277 socantsendmore(fip->fi_writesock);
278 fifo_cleanup(vp);
279 }
280 return (error);
281 }
282 mtx_lock(&fifo_mtx);
283 /*
284 * We must have got woken up because we had a writer.
285 * That (and not still having one) is the condition
286 * that we must wait for.
287 */
288 }
289 if ((ap->a_mode & FWRITE) && fip->fi_readers == 0) {
290 VOP_UNLOCK(vp, 0);
291 error = msleep(&fip->fi_writers, &fifo_mtx,
292 PDROP | PCATCH | PSOCK, "fifoow", 0);
293 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
294 if (error) {
295 fip->fi_writers--;
296 if (fip->fi_writers == 0) {
297 socantrcvmore(fip->fi_readsock);
298 mtx_lock(&fifo_mtx);
299 fip->fi_wgen++;
300 mtx_unlock(&fifo_mtx);
301 fifo_cleanup(vp);
302 }
303 return (error);
304 }
305 /*
306 * We must have got woken up because we had
307 * a reader. That (and not still having one)
308 * is the condition that we must wait for.
309 */
310 mtx_lock(&fifo_mtx);
311 }
312 }
313 mtx_unlock(&fifo_mtx);
314 KASSERT(fp != NULL, ("can't fifo/vnode bypass"));
315 KASSERT(fp->f_ops == &badfileops, ("not badfileops in fifo_open"));
316 finit(fp, fp->f_flag, DTYPE_FIFO, fip, &fifo_ops_f);
317 return (0);
318 }
319
320 static void
321 filt_fifordetach(struct knote *kn)
322 {
323 struct socket *so = (struct socket *)kn->kn_hook;
324
325 SOCKBUF_LOCK(&so->so_rcv);
326 knlist_remove(&so->so_rcv.sb_sel.si_note, kn, 1);
327 if (knlist_empty(&so->so_rcv.sb_sel.si_note))
328 so->so_rcv.sb_flags &= ~SB_KNOTE;
329 SOCKBUF_UNLOCK(&so->so_rcv);
330 }
331
332 static int
333 filt_fiforead(struct knote *kn, long hint)
334 {
335 struct socket *so = (struct socket *)kn->kn_hook;
336
337 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
338 kn->kn_data = so->so_rcv.sb_cc;
339 if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
340 kn->kn_flags |= EV_EOF;
341 return (1);
342 } else {
343 kn->kn_flags &= ~EV_EOF;
344 return (kn->kn_data > 0);
345 }
346 }
347
348 static void
349 filt_fifowdetach(struct knote *kn)
350 {
351 struct socket *so = (struct socket *)kn->kn_hook;
352
353 SOCKBUF_LOCK(&so->so_snd);
354 knlist_remove(&so->so_snd.sb_sel.si_note, kn, 1);
355 if (knlist_empty(&so->so_snd.sb_sel.si_note))
356 so->so_snd.sb_flags &= ~SB_KNOTE;
357 SOCKBUF_UNLOCK(&so->so_snd);
358 }
359
360 static int
361 filt_fifowrite(struct knote *kn, long hint)
362 {
363 struct socket *so = (struct socket *)kn->kn_hook;
364
365 SOCKBUF_LOCK_ASSERT(&so->so_snd);
366 kn->kn_data = sbspace(&so->so_snd);
367 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
368 kn->kn_flags |= EV_EOF;
369 return (1);
370 } else {
371 kn->kn_flags &= ~EV_EOF;
372 return (kn->kn_data >= so->so_snd.sb_lowat);
373 }
374 }
375
376 static void
377 filt_fifodetach_notsup(struct knote *kn)
378 {
379
380 }
381
382 static int
383 filt_fifo_notsup(struct knote *kn, long hint)
384 {
385
386 return (0);
387 }
388
389 /*
390 * Device close routine
391 */
392 /* ARGSUSED */
393 static int
394 fifo_close(ap)
395 struct vop_close_args /* {
396 struct vnode *a_vp;
397 int a_fflag;
398 struct ucred *a_cred;
399 struct thread *a_td;
400 } */ *ap;
401 {
402 struct vnode *vp = ap->a_vp;
403 struct fifoinfo *fip = vp->v_fifoinfo;
404
405 ASSERT_VOP_ELOCKED(vp, "fifo_close");
406 if (fip == NULL) {
407 printf("fifo_close: no v_fifoinfo %p\n", vp);
408 return (0);
409 }
410 if (ap->a_fflag & FREAD) {
411 fip->fi_readers--;
412 if (fip->fi_readers == 0)
413 socantsendmore(fip->fi_writesock);
414 }
415 if (ap->a_fflag & FWRITE) {
416 fip->fi_writers--;
417 if (fip->fi_writers == 0) {
418 socantrcvmore(fip->fi_readsock);
419 mtx_lock(&fifo_mtx);
420 fip->fi_wgen++;
421 mtx_unlock(&fifo_mtx);
422 }
423 }
424 fifo_cleanup(vp);
425 return (0);
426 }
427
428 /*
429 * Print out internal contents of a fifo vnode.
430 */
431 int
432 fifo_printinfo(vp)
433 struct vnode *vp;
434 {
435 register struct fifoinfo *fip = vp->v_fifoinfo;
436
437 if (fip == NULL){
438 printf(", NULL v_fifoinfo");
439 return (0);
440 }
441 printf(", fifo with %ld readers and %ld writers",
442 fip->fi_readers, fip->fi_writers);
443 return (0);
444 }
445
446 /*
447 * Print out the contents of a fifo vnode.
448 */
449 static int
450 fifo_print(ap)
451 struct vop_print_args /* {
452 struct vnode *a_vp;
453 } */ *ap;
454 {
455 printf(" ");
456 fifo_printinfo(ap->a_vp);
457 printf("\n");
458 return (0);
459 }
460
461 /*
462 * Return POSIX pathconf information applicable to fifo's.
463 */
464 static int
465 fifo_pathconf(ap)
466 struct vop_pathconf_args /* {
467 struct vnode *a_vp;
468 int a_name;
469 int *a_retval;
470 } */ *ap;
471 {
472
473 switch (ap->a_name) {
474 case _PC_LINK_MAX:
475 *ap->a_retval = LINK_MAX;
476 return (0);
477 case _PC_PIPE_BUF:
478 *ap->a_retval = PIPE_BUF;
479 return (0);
480 case _PC_CHOWN_RESTRICTED:
481 *ap->a_retval = 1;
482 return (0);
483 default:
484 return (EINVAL);
485 }
486 /* NOTREACHED */
487 }
488
489 /*
490 * Fifo advisory byte-level locks.
491 */
492 /* ARGSUSED */
493 static int
494 fifo_advlock(ap)
495 struct vop_advlock_args /* {
496 struct vnode *a_vp;
497 caddr_t a_id;
498 int a_op;
499 struct flock *a_fl;
500 int a_flags;
501 } */ *ap;
502 {
503
504 return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL);
505 }
506
507 static int
508 fifo_close_f(struct file *fp, struct thread *td)
509 {
510
511 return (vnops.fo_close(fp, td));
512 }
513
514 /*
515 * The implementation of ioctl() for named fifos is complicated by the fact
516 * that we permit O_RDWR fifo file descriptors, meaning that the actions of
517 * ioctls may have to be applied to both the underlying sockets rather than
518 * just one. The original implementation simply forward the ioctl to one
519 * or both sockets based on fp->f_flag. We now consider each ioctl
520 * separately, as the composition effect requires careful ordering.
521 *
522 * We do not blindly pass all ioctls through to the socket in order to avoid
523 * providing unnecessary ioctls that might be improperly depended on by
524 * applications (such as socket-specific, routing, and interface ioctls).
525 *
526 * Unlike sys_pipe.c, fifos do not implement the deprecated TIOCSPGRP and
527 * TIOCGPGRP ioctls. Earlier implementations of fifos did forward SIOCSPGRP
528 * and SIOCGPGRP ioctls, so we might need to re-add those here.
529 */
530 static int
531 fifo_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred,
532 struct thread *td)
533 {
534 struct fifoinfo *fi;
535 struct file filetmp; /* Local, so need not be locked. */
536 int error;
537
538 error = ENOTTY;
539 fi = fp->f_data;
540
541 switch (com) {
542 case FIONBIO:
543 /*
544 * Non-blocking I/O is implemented at the fifo layer using
545 * MSG_NBIO, so does not need to be forwarded down the stack.
546 */
547 return (0);
548
549 case FIOASYNC:
550 case FIOSETOWN:
551 case FIOGETOWN:
552 /*
553 * These socket ioctls don't have any ordering requirements,
554 * so are called in an arbitrary order, and only on the
555 * sockets indicated by the file descriptor rights.
556 *
557 * XXXRW: If O_RDWR and the read socket accepts an ioctl but
558 * the write socket doesn't, the socketpair is left in an
559 * inconsistent state.
560 */
561 if (fp->f_flag & FREAD) {
562 filetmp.f_data = fi->fi_readsock;
563 filetmp.f_cred = cred;
564 error = soo_ioctl(&filetmp, com, data, cred, td);
565 if (error)
566 return (error);
567 }
568 if (fp->f_flag & FWRITE) {
569 filetmp.f_data = fi->fi_writesock;
570 filetmp.f_cred = cred;
571 error = soo_ioctl(&filetmp, com, data, cred, td);
572 }
573 return (error);
574
575 case FIONREAD:
576 /*
577 * FIONREAD will return 0 for non-readable descriptors, and
578 * the results of FIONREAD on the read socket for readable
579 * descriptors.
580 */
581 if (!(fp->f_flag & FREAD)) {
582 *(int *)data = 0;
583 return (0);
584 }
585 filetmp.f_data = fi->fi_readsock;
586 filetmp.f_cred = cred;
587 return (soo_ioctl(&filetmp, com, data, cred, td));
588
589 default:
590 return (ENOTTY);
591 }
592 }
593
594 /*
595 * Because fifos are now a file descriptor layer object, EVFILT_VNODE is not
596 * implemented. Likely, fifo_kqfilter() should be removed, and
597 * fifo_kqfilter_f() should know how to forward the request to the underling
598 * vnode using f_vnode in the file descriptor here.
599 */
600 static int
601 fifo_kqfilter_f(struct file *fp, struct knote *kn)
602 {
603 struct fifoinfo *fi;
604 struct socket *so;
605 struct sockbuf *sb;
606
607 fi = fp->f_data;
608
609 /*
610 * If a filter is requested that is not supported by this file
611 * descriptor, don't return an error, but also don't ever generate an
612 * event.
613 */
614 if ((kn->kn_filter == EVFILT_READ) && !(fp->f_flag & FREAD)) {
615 kn->kn_fop = &fifo_notsup_filtops;
616 return (0);
617 }
618
619 if ((kn->kn_filter == EVFILT_WRITE) && !(fp->f_flag & FWRITE)) {
620 kn->kn_fop = &fifo_notsup_filtops;
621 return (0);
622 }
623
624 switch (kn->kn_filter) {
625 case EVFILT_READ:
626 kn->kn_fop = &fiforead_filtops;
627 so = fi->fi_readsock;
628 sb = &so->so_rcv;
629 break;
630 case EVFILT_WRITE:
631 kn->kn_fop = &fifowrite_filtops;
632 so = fi->fi_writesock;
633 sb = &so->so_snd;
634 break;
635 default:
636 return (EINVAL);
637 }
638
639 kn->kn_hook = (caddr_t)so;
640
641 SOCKBUF_LOCK(sb);
642 knlist_add(&sb->sb_sel.si_note, kn, 1);
643 sb->sb_flags |= SB_KNOTE;
644 SOCKBUF_UNLOCK(sb);
645
646 return (0);
647 }
648
649 static int
650 fifo_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td)
651 {
652 struct fifoinfo *fip;
653 struct file filetmp;
654 int levents, revents = 0;
655
656 fip = fp->f_data;
657 levents = events &
658 (POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM | POLLRDBAND);
659 if ((fp->f_flag & FREAD) && levents) {
660 filetmp.f_data = fip->fi_readsock;
661 filetmp.f_cred = cred;
662 mtx_lock(&fifo_mtx);
663 if (fp->f_seqcount == fip->fi_wgen)
664 levents |= POLLINIGNEOF;
665 mtx_unlock(&fifo_mtx);
666 revents |= soo_poll(&filetmp, levents, cred, td);
667 }
668 levents = events & (POLLOUT | POLLWRNORM | POLLWRBAND);
669 if ((fp->f_flag & FWRITE) && levents) {
670 filetmp.f_data = fip->fi_writesock;
671 filetmp.f_cred = cred;
672 revents |= soo_poll(&filetmp, levents, cred, td);
673 }
674 return (revents);
675 }
676
677 static int
678 fifo_read_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td)
679 {
680 struct fifoinfo *fip;
681 int sflags;
682
683 fip = fp->f_data;
684 KASSERT(uio->uio_rw == UIO_READ,("fifo_read mode"));
685 if (uio->uio_resid == 0)
686 return (0);
687 sflags = (fp->f_flag & FNONBLOCK) ? MSG_NBIO : 0;
688 return (soreceive(fip->fi_readsock, NULL, uio, NULL, NULL, &sflags));
689 }
690
691 static int
692 fifo_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td)
693 {
694
695 return (vnops.fo_stat(fp, sb, cred, td));
696 }
697
698 static int
699 fifo_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td)
700 {
701
702 return (vnops.fo_truncate(fp, length, cred, td));
703 }
704
705 static int
706 fifo_write_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td)
707 {
708 struct fifoinfo *fip;
709 int sflags;
710
711 fip = fp->f_data;
712 KASSERT(uio->uio_rw == UIO_WRITE,("fifo_write mode"));
713 sflags = (fp->f_flag & FNONBLOCK) ? MSG_NBIO : 0;
714 return (sosend(fip->fi_writesock, NULL, uio, 0, NULL, sflags, td));
715 }
Cache object: fe2fbc9535f357229b74f946b463a1b7
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