__P()!=wanted, clean up the vm subsystem
[dragonfly.git] / sys / vfs / fifofs / fifo_vnops.c
CommitLineData
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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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)fifo_vnops.c 8.10 (Berkeley) 5/27/95
34 * $FreeBSD: src/sys/miscfs/fifofs/fifo_vnops.c,v 1.45.2.4 2003/04/22 10:11:24 bde Exp $
1f2de5d4 35 * $DragonFly: src/sys/vfs/fifofs/fifo_vnops.c,v 1.7 2003/08/07 21:17:40 dillon Exp $
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36 */
37
38#include <sys/param.h>
39#include <sys/systm.h>
40#include <sys/unistd.h>
41#include <sys/kernel.h>
42#include <sys/lock.h>
43#include <sys/malloc.h>
44#include <sys/vnode.h>
45#include <sys/socket.h>
46#include <sys/socketvar.h>
47#include <sys/filio.h>
48#include <sys/fcntl.h>
49#include <sys/file.h>
50#include <sys/event.h>
51#include <sys/poll.h>
52#include <sys/un.h>
1f2de5d4 53#include "fifo.h"
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54
55/*
56 * This structure is associated with the FIFO vnode and stores
57 * the state associated with the FIFO.
58 */
59struct fifoinfo {
60 struct socket *fi_readsock;
61 struct socket *fi_writesock;
62 long fi_readers;
63 long fi_writers;
64};
65
66static int fifo_badop __P((void));
67static int fifo_print __P((struct vop_print_args *));
68static int fifo_lookup __P((struct vop_lookup_args *));
69static int fifo_open __P((struct vop_open_args *));
70static int fifo_close __P((struct vop_close_args *));
71static int fifo_read __P((struct vop_read_args *));
72static int fifo_write __P((struct vop_write_args *));
73static int fifo_ioctl __P((struct vop_ioctl_args *));
74static int fifo_poll __P((struct vop_poll_args *));
75static int fifo_kqfilter __P((struct vop_kqfilter_args *));
76static int fifo_inactive __P((struct vop_inactive_args *));
77static int fifo_bmap __P((struct vop_bmap_args *));
78static int fifo_pathconf __P((struct vop_pathconf_args *));
79static int fifo_advlock __P((struct vop_advlock_args *));
80
81static void filt_fifordetach(struct knote *kn);
82static int filt_fiforead(struct knote *kn, long hint);
83static void filt_fifowdetach(struct knote *kn);
84static int filt_fifowrite(struct knote *kn, long hint);
85
86static struct filterops fiforead_filtops =
87 { 1, NULL, filt_fifordetach, filt_fiforead };
88static struct filterops fifowrite_filtops =
89 { 1, NULL, filt_fifowdetach, filt_fifowrite };
90
91vop_t **fifo_vnodeop_p;
92static struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
93 { &vop_default_desc, (vop_t *) vop_defaultop },
94 { &vop_access_desc, (vop_t *) vop_ebadf },
95 { &vop_advlock_desc, (vop_t *) fifo_advlock },
96 { &vop_bmap_desc, (vop_t *) fifo_bmap },
97 { &vop_close_desc, (vop_t *) fifo_close },
98 { &vop_create_desc, (vop_t *) fifo_badop },
99 { &vop_getattr_desc, (vop_t *) vop_ebadf },
100 { &vop_inactive_desc, (vop_t *) fifo_inactive },
101 { &vop_ioctl_desc, (vop_t *) fifo_ioctl },
102 { &vop_kqfilter_desc, (vop_t *) fifo_kqfilter },
103 { &vop_lease_desc, (vop_t *) vop_null },
104 { &vop_link_desc, (vop_t *) fifo_badop },
105 { &vop_lookup_desc, (vop_t *) fifo_lookup },
106 { &vop_mkdir_desc, (vop_t *) fifo_badop },
107 { &vop_mknod_desc, (vop_t *) fifo_badop },
108 { &vop_open_desc, (vop_t *) fifo_open },
109 { &vop_pathconf_desc, (vop_t *) fifo_pathconf },
110 { &vop_poll_desc, (vop_t *) fifo_poll },
111 { &vop_print_desc, (vop_t *) fifo_print },
112 { &vop_read_desc, (vop_t *) fifo_read },
113 { &vop_readdir_desc, (vop_t *) fifo_badop },
114 { &vop_readlink_desc, (vop_t *) fifo_badop },
115 { &vop_reallocblks_desc, (vop_t *) fifo_badop },
116 { &vop_reclaim_desc, (vop_t *) vop_null },
117 { &vop_remove_desc, (vop_t *) fifo_badop },
118 { &vop_rename_desc, (vop_t *) fifo_badop },
119 { &vop_rmdir_desc, (vop_t *) fifo_badop },
120 { &vop_setattr_desc, (vop_t *) vop_ebadf },
121 { &vop_symlink_desc, (vop_t *) fifo_badop },
122 { &vop_write_desc, (vop_t *) fifo_write },
123 { NULL, NULL }
124};
125static struct vnodeopv_desc fifo_vnodeop_opv_desc =
126 { &fifo_vnodeop_p, fifo_vnodeop_entries };
127
128VNODEOP_SET(fifo_vnodeop_opv_desc);
129
130int
131fifo_vnoperate(ap)
132 struct vop_generic_args /* {
133 struct vnodeop_desc *a_desc;
134 <other random data follows, presumably>
135 } */ *ap;
136{
137 return (VOCALL(fifo_vnodeop_p, ap->a_desc->vdesc_offset, ap));
138}
139
140/*
141 * Trivial lookup routine that always fails.
142 */
143/* ARGSUSED */
144static int
145fifo_lookup(ap)
146 struct vop_lookup_args /* {
147 struct vnode * a_dvp;
148 struct vnode ** a_vpp;
149 struct componentname * a_cnp;
150 } */ *ap;
151{
152
153 *ap->a_vpp = NULL;
154 return (ENOTDIR);
155}
156
157/*
158 * Open called to set up a new instance of a fifo or
159 * to find an active instance of a fifo.
160 */
161/* ARGSUSED */
162static int
163fifo_open(ap)
164 struct vop_open_args /* {
165 struct vnode *a_vp;
166 int a_mode;
167 struct ucred *a_cred;
dadab5e9 168 struct thread *a_td;
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169 } */ *ap;
170{
171 struct vnode *vp = ap->a_vp;
172 struct fifoinfo *fip;
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173 struct socket *rso, *wso;
174 int error;
175
176 if ((fip = vp->v_fifoinfo) == NULL) {
177 MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK);
178 vp->v_fifoinfo = fip;
dadab5e9 179 error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, ap->a_td);
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180 if (error) {
181 free(fip, M_VNODE);
182 vp->v_fifoinfo = NULL;
183 return (error);
184 }
185 fip->fi_readsock = rso;
dadab5e9 186 error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, ap->a_td);
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187 if (error) {
188 (void)soclose(rso);
189 free(fip, M_VNODE);
190 vp->v_fifoinfo = NULL;
191 return (error);
192 }
193 fip->fi_writesock = wso;
194 error = unp_connect2(wso, rso);
195 if (error) {
196 (void)soclose(wso);
197 (void)soclose(rso);
198 free(fip, M_VNODE);
199 vp->v_fifoinfo = NULL;
200 return (error);
201 }
202 fip->fi_readers = fip->fi_writers = 0;
203 wso->so_snd.sb_lowat = PIPE_BUF;
204 rso->so_state |= SS_CANTRCVMORE;
205 }
206 if (ap->a_mode & FREAD) {
207 fip->fi_readers++;
208 if (fip->fi_readers == 1) {
209 fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
210 if (fip->fi_writers > 0) {
211 wakeup((caddr_t)&fip->fi_writers);
212 sowwakeup(fip->fi_writesock);
213 }
214 }
215 }
216 if (ap->a_mode & FWRITE) {
217 fip->fi_writers++;
218 if (fip->fi_writers == 1) {
219 fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
220 if (fip->fi_readers > 0) {
221 wakeup((caddr_t)&fip->fi_readers);
222 sorwakeup(fip->fi_writesock);
223 }
224 }
225 }
226 if ((ap->a_mode & FREAD) && (ap->a_mode & O_NONBLOCK) == 0) {
227 if (fip->fi_writers == 0) {
dadab5e9 228 VOP_UNLOCK(vp, 0, ap->a_td);
984263bc 229 error = tsleep((caddr_t)&fip->fi_readers,
377d4740 230 PCATCH, "fifoor", 0);
dadab5e9 231 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, ap->a_td);
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232 if (error)
233 goto bad;
234 /*
235 * We must have got woken up because we had a writer.
236 * That (and not still having one) is the condition
237 * that we must wait for.
238 */
239 }
240 }
241 if (ap->a_mode & FWRITE) {
242 if (ap->a_mode & O_NONBLOCK) {
243 if (fip->fi_readers == 0) {
244 error = ENXIO;
245 goto bad;
246 }
247 } else {
248 if (fip->fi_readers == 0) {
dadab5e9 249 VOP_UNLOCK(vp, 0, ap->a_td);
984263bc 250 error = tsleep((caddr_t)&fip->fi_writers,
377d4740 251 PCATCH, "fifoow", 0);
dadab5e9 252 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, ap->a_td);
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253 if (error)
254 goto bad;
255 /*
256 * We must have got woken up because we had
257 * a reader. That (and not still having one)
258 * is the condition that we must wait for.
259 */
260 }
261 }
262 }
263 return (0);
264bad:
3b568787 265 VOP_CLOSE(vp, ap->a_mode, ap->a_td);
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266 return (error);
267}
268
269/*
270 * Vnode op for read
271 */
272/* ARGSUSED */
273static int
274fifo_read(ap)
275 struct vop_read_args /* {
276 struct vnode *a_vp;
277 struct uio *a_uio;
278 int a_ioflag;
279 struct ucred *a_cred;
280 } */ *ap;
281{
282 struct uio *uio = ap->a_uio;
283 struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
dadab5e9 284 struct thread *td = uio->uio_td;
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285 int error, startresid;
286
287#ifdef DIAGNOSTIC
288 if (uio->uio_rw != UIO_READ)
289 panic("fifo_read mode");
290#endif
291 if (uio->uio_resid == 0)
292 return (0);
293 if (ap->a_ioflag & IO_NDELAY)
294 rso->so_state |= SS_NBIO;
295 startresid = uio->uio_resid;
dadab5e9 296 VOP_UNLOCK(ap->a_vp, 0, td);
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297 error = soreceive(rso, (struct sockaddr **)0, uio, (struct mbuf **)0,
298 (struct mbuf **)0, (int *)0);
dadab5e9 299 vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, td);
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300 if (ap->a_ioflag & IO_NDELAY)
301 rso->so_state &= ~SS_NBIO;
302 return (error);
303}
304
305/*
306 * Vnode op for write
307 */
308/* ARGSUSED */
309static int
310fifo_write(ap)
311 struct vop_write_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 socket *wso = ap->a_vp->v_fifoinfo->fi_writesock;
dadab5e9 319 struct thread *td = ap->a_uio->uio_td;
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320 int error;
321
322#ifdef DIAGNOSTIC
323 if (ap->a_uio->uio_rw != UIO_WRITE)
324 panic("fifo_write mode");
325#endif
326 if (ap->a_ioflag & IO_NDELAY)
327 wso->so_state |= SS_NBIO;
dadab5e9 328 VOP_UNLOCK(ap->a_vp, 0, td);
984263bc 329 error = sosend(wso, (struct sockaddr *)0, ap->a_uio, 0,
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330 (struct mbuf *)0, 0, td);
331 vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, td);
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332 if (ap->a_ioflag & IO_NDELAY)
333 wso->so_state &= ~SS_NBIO;
334 return (error);
335}
336
337/*
338 * Device ioctl operation.
339 */
340/* ARGSUSED */
341static int
342fifo_ioctl(ap)
343 struct vop_ioctl_args /* {
344 struct vnode *a_vp;
345 int a_command;
346 caddr_t a_data;
347 int a_fflag;
348 struct ucred *a_cred;
dadab5e9 349 struct thread *a_td;
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350 } */ *ap;
351{
352 struct file filetmp;
353 int error;
354
355 if (ap->a_command == FIONBIO)
356 return (0);
357 if (ap->a_fflag & FREAD) {
358 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
dadab5e9 359 error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_td);
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360 if (error)
361 return (error);
362 }
363 if (ap->a_fflag & FWRITE) {
364 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
dadab5e9 365 error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_td);
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366 if (error)
367 return (error);
368 }
369 return (0);
370}
371
372/* ARGSUSED */
373static int
374fifo_kqfilter(ap)
375 struct vop_kqfilter_args /* {
376 struct vnode *a_vp;
377 struct knote *a_kn;
378 } */ *ap;
379{
380 struct fifoinfo *fi = ap->a_vp->v_fifoinfo;
381 struct socket *so;
382 struct sockbuf *sb;
383
384 switch (ap->a_kn->kn_filter) {
385 case EVFILT_READ:
386 ap->a_kn->kn_fop = &fiforead_filtops;
387 so = fi->fi_readsock;
388 sb = &so->so_rcv;
389 break;
390 case EVFILT_WRITE:
391 ap->a_kn->kn_fop = &fifowrite_filtops;
392 so = fi->fi_writesock;
393 sb = &so->so_snd;
394 break;
395 default:
396 return (1);
397 }
398
399 ap->a_kn->kn_hook = (caddr_t)so;
400
401 SLIST_INSERT_HEAD(&sb->sb_sel.si_note, ap->a_kn, kn_selnext);
402 sb->sb_flags |= SB_KNOTE;
403
404 return (0);
405}
406
407static void
408filt_fifordetach(struct knote *kn)
409{
410 struct socket *so = (struct socket *)kn->kn_hook;
411
412 SLIST_REMOVE(&so->so_rcv.sb_sel.si_note, kn, knote, kn_selnext);
413 if (SLIST_EMPTY(&so->so_rcv.sb_sel.si_note))
414 so->so_rcv.sb_flags &= ~SB_KNOTE;
415}
416
417static int
418filt_fiforead(struct knote *kn, long hint)
419{
420 struct socket *so = (struct socket *)kn->kn_hook;
421
422 kn->kn_data = so->so_rcv.sb_cc;
423 if (so->so_state & SS_CANTRCVMORE) {
424 kn->kn_flags |= EV_EOF;
425 return (1);
426 }
427 kn->kn_flags &= ~EV_EOF;
428 return (kn->kn_data > 0);
429}
430
431static void
432filt_fifowdetach(struct knote *kn)
433{
434 struct socket *so = (struct socket *)kn->kn_hook;
435
436 SLIST_REMOVE(&so->so_snd.sb_sel.si_note, kn, knote, kn_selnext);
437 if (SLIST_EMPTY(&so->so_snd.sb_sel.si_note))
438 so->so_snd.sb_flags &= ~SB_KNOTE;
439}
440
441static int
442filt_fifowrite(struct knote *kn, long hint)
443{
444 struct socket *so = (struct socket *)kn->kn_hook;
445
446 kn->kn_data = sbspace(&so->so_snd);
447 if (so->so_state & SS_CANTSENDMORE) {
448 kn->kn_flags |= EV_EOF;
449 return (1);
450 }
451 kn->kn_flags &= ~EV_EOF;
452 return (kn->kn_data >= so->so_snd.sb_lowat);
453}
454
455/* ARGSUSED */
456static int
457fifo_poll(ap)
458 struct vop_poll_args /* {
459 struct vnode *a_vp;
460 int a_events;
461 struct ucred *a_cred;
dadab5e9 462 struct thread *a_td;
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463 } */ *ap;
464{
465 struct file filetmp;
466 int revents = 0;
467
468 if (ap->a_events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
469 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
470 if (filetmp.f_data)
471 revents |= soo_poll(&filetmp, ap->a_events, ap->a_cred,
dadab5e9 472 ap->a_td);
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473 }
474 if (ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND)) {
475 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
476 if (filetmp.f_data)
477 revents |= soo_poll(&filetmp, ap->a_events, ap->a_cred,
dadab5e9 478 ap->a_td);
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479 }
480 return (revents);
481}
482
483static int
484fifo_inactive(ap)
485 struct vop_inactive_args /* {
486 struct vnode *a_vp;
dadab5e9 487 struct thread *a_td;
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488 } */ *ap;
489{
dadab5e9 490 VOP_UNLOCK(ap->a_vp, 0, ap->a_td);
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491 return (0);
492}
493
494/*
495 * This is a noop, simply returning what one has been given.
496 */
497static int
498fifo_bmap(ap)
499 struct vop_bmap_args /* {
500 struct vnode *a_vp;
501 daddr_t a_bn;
502 struct vnode **a_vpp;
503 daddr_t *a_bnp;
504 int *a_runp;
505 int *a_runb;
506 } */ *ap;
507{
508
509 if (ap->a_vpp != NULL)
510 *ap->a_vpp = ap->a_vp;
511 if (ap->a_bnp != NULL)
512 *ap->a_bnp = ap->a_bn;
513 if (ap->a_runp != NULL)
514 *ap->a_runp = 0;
515 if (ap->a_runb != NULL)
516 *ap->a_runb = 0;
517 return (0);
518}
519
520/*
521 * Device close routine
522 */
523/* ARGSUSED */
524static int
525fifo_close(ap)
526 struct vop_close_args /* {
527 struct vnode *a_vp;
528 int a_fflag;
529 struct ucred *a_cred;
dadab5e9 530 struct thread *a_td;
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531 } */ *ap;
532{
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533 struct vnode *vp = ap->a_vp;
534 struct fifoinfo *fip = vp->v_fifoinfo;
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535 int error1, error2;
536
537 if (ap->a_fflag & FREAD) {
538 fip->fi_readers--;
539 if (fip->fi_readers == 0)
540 socantsendmore(fip->fi_writesock);
541 }
542 if (ap->a_fflag & FWRITE) {
543 fip->fi_writers--;
544 if (fip->fi_writers == 0)
545 socantrcvmore(fip->fi_readsock);
546 }
547 if (vp->v_usecount > 1)
548 return (0);
549 error1 = soclose(fip->fi_readsock);
550 error2 = soclose(fip->fi_writesock);
551 FREE(fip, M_VNODE);
552 vp->v_fifoinfo = NULL;
553 if (error1)
554 return (error1);
555 return (error2);
556}
557
558
559/*
560 * Print out internal contents of a fifo vnode.
561 */
562int
563fifo_printinfo(vp)
564 struct vnode *vp;
565{
0e99e805 566 struct fifoinfo *fip = vp->v_fifoinfo;
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567
568 printf(", fifo with %ld readers and %ld writers",
569 fip->fi_readers, fip->fi_writers);
570 return (0);
571}
572
573/*
574 * Print out the contents of a fifo vnode.
575 */
576static int
577fifo_print(ap)
578 struct vop_print_args /* {
579 struct vnode *a_vp;
580 } */ *ap;
581{
582
583 printf("tag VT_NON");
584 fifo_printinfo(ap->a_vp);
585 printf("\n");
586 return (0);
587}
588
589/*
590 * Return POSIX pathconf information applicable to fifo's.
591 */
592int
593fifo_pathconf(ap)
594 struct vop_pathconf_args /* {
595 struct vnode *a_vp;
596 int a_name;
597 int *a_retval;
598 } */ *ap;
599{
600
601 switch (ap->a_name) {
602 case _PC_LINK_MAX:
603 *ap->a_retval = LINK_MAX;
604 return (0);
605 case _PC_PIPE_BUF:
606 *ap->a_retval = PIPE_BUF;
607 return (0);
608 case _PC_CHOWN_RESTRICTED:
609 *ap->a_retval = 1;
610 return (0);
611 default:
612 return (EINVAL);
613 }
614 /* NOTREACHED */
615}
616
617/*
618 * Fifo advisory byte-level locks.
619 */
620/* ARGSUSED */
621static int
622fifo_advlock(ap)
623 struct vop_advlock_args /* {
624 struct vnode *a_vp;
625 caddr_t a_id;
626 int a_op;
627 struct flock *a_fl;
628 int a_flags;
629 } */ *ap;
630{
631
632 return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL);
633}
634
635/*
636 * Fifo bad operation
637 */
638static int
639fifo_badop()
640{
641
642 panic("fifo_badop called");
643 /* NOTREACHED */
644}