fifo_vnops.c revision 1.8 1 1.1 cgd /*
2 1.8 mycroft * Copyright (c) 1990, 1993
3 1.8 mycroft * The Regents of the University of California. All rights reserved.
4 1.1 cgd *
5 1.1 cgd * Redistribution and use in source and binary forms, with or without
6 1.1 cgd * modification, are permitted provided that the following conditions
7 1.1 cgd * are met:
8 1.1 cgd * 1. Redistributions of source code must retain the above copyright
9 1.1 cgd * notice, this list of conditions and the following disclaimer.
10 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright
11 1.1 cgd * notice, this list of conditions and the following disclaimer in the
12 1.1 cgd * documentation and/or other materials provided with the distribution.
13 1.1 cgd * 3. All advertising materials mentioning features or use of this software
14 1.1 cgd * must display the following acknowledgement:
15 1.1 cgd * This product includes software developed by the University of
16 1.1 cgd * California, Berkeley and its contributors.
17 1.1 cgd * 4. Neither the name of the University nor the names of its contributors
18 1.1 cgd * may be used to endorse or promote products derived from this software
19 1.1 cgd * without specific prior written permission.
20 1.1 cgd *
21 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 1.1 cgd * SUCH DAMAGE.
32 1.1 cgd *
33 1.8 mycroft * from: @(#)fifo_vnops.c 8.2 (Berkeley) 1/4/94
34 1.8 mycroft * $Id: fifo_vnops.c,v 1.8 1994/06/08 11:33:17 mycroft Exp $
35 1.1 cgd */
36 1.1 cgd
37 1.6 mycroft #include <sys/param.h>
38 1.8 mycroft #include <sys/proc.h>
39 1.6 mycroft #include <sys/time.h>
40 1.6 mycroft #include <sys/namei.h>
41 1.6 mycroft #include <sys/vnode.h>
42 1.6 mycroft #include <sys/socket.h>
43 1.6 mycroft #include <sys/socketvar.h>
44 1.6 mycroft #include <sys/stat.h>
45 1.6 mycroft #include <sys/systm.h>
46 1.6 mycroft #include <sys/ioctl.h>
47 1.6 mycroft #include <sys/file.h>
48 1.6 mycroft #include <sys/errno.h>
49 1.6 mycroft #include <sys/malloc.h>
50 1.6 mycroft #include <miscfs/fifofs/fifo.h>
51 1.1 cgd
52 1.1 cgd /*
53 1.1 cgd * This structure is associated with the FIFO vnode and stores
54 1.1 cgd * the state associated with the FIFO.
55 1.1 cgd */
56 1.1 cgd struct fifoinfo {
57 1.1 cgd struct socket *fi_readsock;
58 1.1 cgd struct socket *fi_writesock;
59 1.1 cgd long fi_readers;
60 1.1 cgd long fi_writers;
61 1.1 cgd };
62 1.1 cgd
63 1.8 mycroft int (**fifo_vnodeop_p)();
64 1.8 mycroft struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
65 1.8 mycroft { &vop_default_desc, vn_default_error },
66 1.8 mycroft { &vop_lookup_desc, fifo_lookup }, /* lookup */
67 1.8 mycroft { &vop_create_desc, fifo_create }, /* create */
68 1.8 mycroft { &vop_mknod_desc, fifo_mknod }, /* mknod */
69 1.8 mycroft { &vop_open_desc, fifo_open }, /* open */
70 1.8 mycroft { &vop_close_desc, fifo_close }, /* close */
71 1.8 mycroft { &vop_access_desc, fifo_access }, /* access */
72 1.8 mycroft { &vop_getattr_desc, fifo_getattr }, /* getattr */
73 1.8 mycroft { &vop_setattr_desc, fifo_setattr }, /* setattr */
74 1.8 mycroft { &vop_read_desc, fifo_read }, /* read */
75 1.8 mycroft { &vop_write_desc, fifo_write }, /* write */
76 1.8 mycroft { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */
77 1.8 mycroft { &vop_select_desc, fifo_select }, /* select */
78 1.8 mycroft { &vop_mmap_desc, fifo_mmap }, /* mmap */
79 1.8 mycroft { &vop_fsync_desc, fifo_fsync }, /* fsync */
80 1.8 mycroft { &vop_seek_desc, fifo_seek }, /* seek */
81 1.8 mycroft { &vop_remove_desc, fifo_remove }, /* remove */
82 1.8 mycroft { &vop_link_desc, fifo_link }, /* link */
83 1.8 mycroft { &vop_rename_desc, fifo_rename }, /* rename */
84 1.8 mycroft { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */
85 1.8 mycroft { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */
86 1.8 mycroft { &vop_symlink_desc, fifo_symlink }, /* symlink */
87 1.8 mycroft { &vop_readdir_desc, fifo_readdir }, /* readdir */
88 1.8 mycroft { &vop_readlink_desc, fifo_readlink }, /* readlink */
89 1.8 mycroft { &vop_abortop_desc, fifo_abortop }, /* abortop */
90 1.8 mycroft { &vop_inactive_desc, fifo_inactive }, /* inactive */
91 1.8 mycroft { &vop_reclaim_desc, fifo_reclaim }, /* reclaim */
92 1.8 mycroft { &vop_lock_desc, fifo_lock }, /* lock */
93 1.8 mycroft { &vop_unlock_desc, fifo_unlock }, /* unlock */
94 1.8 mycroft { &vop_bmap_desc, fifo_bmap }, /* bmap */
95 1.8 mycroft { &vop_strategy_desc, fifo_strategy }, /* strategy */
96 1.8 mycroft { &vop_print_desc, fifo_print }, /* print */
97 1.8 mycroft { &vop_islocked_desc, fifo_islocked }, /* islocked */
98 1.8 mycroft { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */
99 1.8 mycroft { &vop_advlock_desc, fifo_advlock }, /* advlock */
100 1.8 mycroft { &vop_blkatoff_desc, fifo_blkatoff }, /* blkatoff */
101 1.8 mycroft { &vop_valloc_desc, fifo_valloc }, /* valloc */
102 1.8 mycroft { &vop_vfree_desc, fifo_vfree }, /* vfree */
103 1.8 mycroft { &vop_truncate_desc, fifo_truncate }, /* truncate */
104 1.8 mycroft { &vop_update_desc, fifo_update }, /* update */
105 1.8 mycroft { &vop_bwrite_desc, fifo_bwrite }, /* bwrite */
106 1.8 mycroft { (struct vnodeop_desc*)NULL, (int(*)())NULL }
107 1.1 cgd };
108 1.8 mycroft struct vnodeopv_desc fifo_vnodeop_opv_desc =
109 1.8 mycroft { &fifo_vnodeop_p, fifo_vnodeop_entries };
110 1.1 cgd
111 1.1 cgd /*
112 1.1 cgd * Trivial lookup routine that always fails.
113 1.1 cgd */
114 1.1 cgd /* ARGSUSED */
115 1.8 mycroft fifo_lookup(ap)
116 1.8 mycroft struct vop_lookup_args /* {
117 1.8 mycroft struct vnode * a_dvp;
118 1.8 mycroft struct vnode ** a_vpp;
119 1.8 mycroft struct componentname * a_cnp;
120 1.8 mycroft } */ *ap;
121 1.1 cgd {
122 1.8 mycroft
123 1.8 mycroft *ap->a_vpp = NULL;
124 1.1 cgd return (ENOTDIR);
125 1.1 cgd }
126 1.1 cgd
127 1.1 cgd /*
128 1.1 cgd * Open called to set up a new instance of a fifo or
129 1.1 cgd * to find an active instance of a fifo.
130 1.1 cgd */
131 1.1 cgd /* ARGSUSED */
132 1.8 mycroft fifo_open(ap)
133 1.8 mycroft struct vop_open_args /* {
134 1.8 mycroft struct vnode *a_vp;
135 1.8 mycroft int a_mode;
136 1.8 mycroft struct ucred *a_cred;
137 1.8 mycroft struct proc *a_p;
138 1.8 mycroft } */ *ap;
139 1.1 cgd {
140 1.8 mycroft register struct vnode *vp = ap->a_vp;
141 1.1 cgd register struct fifoinfo *fip;
142 1.1 cgd struct socket *rso, *wso;
143 1.1 cgd int error;
144 1.1 cgd static char openstr[] = "fifo";
145 1.1 cgd
146 1.8 mycroft if ((ap->a_mode & (FREAD|FWRITE)) == (FREAD|FWRITE))
147 1.1 cgd return (EINVAL);
148 1.1 cgd if ((fip = vp->v_fifoinfo) == NULL) {
149 1.1 cgd MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK);
150 1.1 cgd vp->v_fifoinfo = fip;
151 1.8 mycroft if (error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0)) {
152 1.1 cgd free(fip, M_VNODE);
153 1.1 cgd vp->v_fifoinfo = NULL;
154 1.1 cgd return (error);
155 1.1 cgd }
156 1.1 cgd fip->fi_readsock = rso;
157 1.8 mycroft if (error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0)) {
158 1.1 cgd (void)soclose(rso);
159 1.1 cgd free(fip, M_VNODE);
160 1.1 cgd vp->v_fifoinfo = NULL;
161 1.1 cgd return (error);
162 1.1 cgd }
163 1.1 cgd fip->fi_writesock = wso;
164 1.1 cgd if (error = unp_connect2(wso, rso)) {
165 1.1 cgd (void)soclose(wso);
166 1.1 cgd (void)soclose(rso);
167 1.1 cgd free(fip, M_VNODE);
168 1.1 cgd vp->v_fifoinfo = NULL;
169 1.1 cgd return (error);
170 1.1 cgd }
171 1.8 mycroft fip->fi_readers = fip->fi_writers = 0;
172 1.1 cgd wso->so_state |= SS_CANTRCVMORE;
173 1.1 cgd rso->so_state |= SS_CANTSENDMORE;
174 1.1 cgd }
175 1.1 cgd error = 0;
176 1.8 mycroft if (ap->a_mode & FREAD) {
177 1.1 cgd fip->fi_readers++;
178 1.1 cgd if (fip->fi_readers == 1) {
179 1.1 cgd fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
180 1.1 cgd if (fip->fi_writers > 0)
181 1.1 cgd wakeup((caddr_t)&fip->fi_writers);
182 1.1 cgd }
183 1.8 mycroft if (ap->a_mode & O_NONBLOCK)
184 1.1 cgd return (0);
185 1.2 cgd while (fip->fi_writers == 0) {
186 1.2 cgd VOP_UNLOCK(vp);
187 1.8 mycroft error = tsleep((caddr_t)&fip->fi_readers,
188 1.8 mycroft PCATCH | PSOCK, openstr, 0);
189 1.2 cgd VOP_LOCK(vp);
190 1.8 mycroft if (error)
191 1.1 cgd break;
192 1.2 cgd }
193 1.1 cgd } else {
194 1.1 cgd fip->fi_writers++;
195 1.8 mycroft if (fip->fi_readers == 0 && (ap->a_mode & O_NONBLOCK)) {
196 1.1 cgd error = ENXIO;
197 1.1 cgd } else {
198 1.1 cgd if (fip->fi_writers == 1) {
199 1.1 cgd fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
200 1.1 cgd if (fip->fi_readers > 0)
201 1.1 cgd wakeup((caddr_t)&fip->fi_readers);
202 1.1 cgd }
203 1.2 cgd while (fip->fi_readers == 0) {
204 1.2 cgd VOP_UNLOCK(vp);
205 1.2 cgd error = tsleep((caddr_t)&fip->fi_writers,
206 1.8 mycroft PCATCH | PSOCK, openstr, 0);
207 1.2 cgd VOP_LOCK(vp);
208 1.8 mycroft if (error)
209 1.1 cgd break;
210 1.2 cgd }
211 1.1 cgd }
212 1.1 cgd }
213 1.1 cgd if (error)
214 1.8 mycroft VOP_CLOSE(vp, ap->a_mode, ap->a_cred, ap->a_p);
215 1.1 cgd return (error);
216 1.1 cgd }
217 1.1 cgd
218 1.1 cgd /*
219 1.1 cgd * Vnode op for read
220 1.1 cgd */
221 1.1 cgd /* ARGSUSED */
222 1.8 mycroft fifo_read(ap)
223 1.8 mycroft struct vop_read_args /* {
224 1.8 mycroft struct vnode *a_vp;
225 1.8 mycroft struct uio *a_uio;
226 1.8 mycroft int a_ioflag;
227 1.8 mycroft struct ucred *a_cred;
228 1.8 mycroft } */ *ap;
229 1.1 cgd {
230 1.8 mycroft register struct uio *uio = ap->a_uio;
231 1.8 mycroft register struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
232 1.1 cgd int error, startresid;
233 1.1 cgd
234 1.1 cgd #ifdef DIAGNOSTIC
235 1.1 cgd if (uio->uio_rw != UIO_READ)
236 1.1 cgd panic("fifo_read mode");
237 1.1 cgd #endif
238 1.1 cgd if (uio->uio_resid == 0)
239 1.1 cgd return (0);
240 1.8 mycroft if (ap->a_ioflag & IO_NDELAY)
241 1.1 cgd rso->so_state |= SS_NBIO;
242 1.1 cgd startresid = uio->uio_resid;
243 1.8 mycroft VOP_UNLOCK(ap->a_vp);
244 1.8 mycroft error = soreceive(rso, (struct mbuf **)0, uio,
245 1.8 mycroft (struct mbuf **)0, (struct mbuf **)0, (int *)0);
246 1.8 mycroft VOP_LOCK(ap->a_vp);
247 1.1 cgd /*
248 1.1 cgd * Clear EOF indication after first such return.
249 1.1 cgd */
250 1.1 cgd if (uio->uio_resid == startresid)
251 1.1 cgd rso->so_state &= ~SS_CANTRCVMORE;
252 1.8 mycroft if (ap->a_ioflag & IO_NDELAY)
253 1.1 cgd rso->so_state &= ~SS_NBIO;
254 1.1 cgd return (error);
255 1.1 cgd }
256 1.1 cgd
257 1.1 cgd /*
258 1.1 cgd * Vnode op for write
259 1.1 cgd */
260 1.1 cgd /* ARGSUSED */
261 1.8 mycroft fifo_write(ap)
262 1.8 mycroft struct vop_write_args /* {
263 1.8 mycroft struct vnode *a_vp;
264 1.8 mycroft struct uio *a_uio;
265 1.8 mycroft int a_ioflag;
266 1.8 mycroft struct ucred *a_cred;
267 1.8 mycroft } */ *ap;
268 1.1 cgd {
269 1.8 mycroft struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock;
270 1.1 cgd int error;
271 1.1 cgd
272 1.1 cgd #ifdef DIAGNOSTIC
273 1.8 mycroft if (ap->a_uio->uio_rw != UIO_WRITE)
274 1.1 cgd panic("fifo_write mode");
275 1.1 cgd #endif
276 1.8 mycroft if (ap->a_ioflag & IO_NDELAY)
277 1.1 cgd wso->so_state |= SS_NBIO;
278 1.8 mycroft VOP_UNLOCK(ap->a_vp);
279 1.8 mycroft error = sosend(wso, (struct mbuf *)0, ap->a_uio, 0, (struct mbuf *)0, 0);
280 1.8 mycroft VOP_LOCK(ap->a_vp);
281 1.8 mycroft if (ap->a_ioflag & IO_NDELAY)
282 1.1 cgd wso->so_state &= ~SS_NBIO;
283 1.1 cgd return (error);
284 1.1 cgd }
285 1.1 cgd
286 1.1 cgd /*
287 1.1 cgd * Device ioctl operation.
288 1.1 cgd */
289 1.1 cgd /* ARGSUSED */
290 1.8 mycroft fifo_ioctl(ap)
291 1.8 mycroft struct vop_ioctl_args /* {
292 1.8 mycroft struct vnode *a_vp;
293 1.8 mycroft int a_command;
294 1.8 mycroft caddr_t a_data;
295 1.8 mycroft int a_fflag;
296 1.8 mycroft struct ucred *a_cred;
297 1.8 mycroft struct proc *a_p;
298 1.8 mycroft } */ *ap;
299 1.1 cgd {
300 1.1 cgd struct file filetmp;
301 1.1 cgd
302 1.8 mycroft if (ap->a_command == FIONBIO)
303 1.1 cgd return (0);
304 1.8 mycroft if (ap->a_fflag & FREAD)
305 1.8 mycroft filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
306 1.1 cgd else
307 1.8 mycroft filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
308 1.8 mycroft return (soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p));
309 1.1 cgd }
310 1.1 cgd
311 1.1 cgd /* ARGSUSED */
312 1.8 mycroft fifo_select(ap)
313 1.8 mycroft struct vop_select_args /* {
314 1.8 mycroft struct vnode *a_vp;
315 1.8 mycroft int a_which;
316 1.8 mycroft int a_fflags;
317 1.8 mycroft struct ucred *a_cred;
318 1.8 mycroft struct proc *a_p;
319 1.8 mycroft } */ *ap;
320 1.1 cgd {
321 1.1 cgd struct file filetmp;
322 1.1 cgd
323 1.8 mycroft if (ap->a_fflags & FREAD)
324 1.8 mycroft filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
325 1.1 cgd else
326 1.8 mycroft filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
327 1.8 mycroft return (soo_select(&filetmp, ap->a_which, ap->a_p));
328 1.1 cgd }
329 1.1 cgd
330 1.1 cgd /*
331 1.1 cgd * This is a noop, simply returning what one has been given.
332 1.1 cgd */
333 1.8 mycroft fifo_bmap(ap)
334 1.8 mycroft struct vop_bmap_args /* {
335 1.8 mycroft struct vnode *a_vp;
336 1.8 mycroft daddr_t a_bn;
337 1.8 mycroft struct vnode **a_vpp;
338 1.8 mycroft daddr_t *a_bnp;
339 1.8 mycroft } */ *ap;
340 1.1 cgd {
341 1.1 cgd
342 1.8 mycroft if (ap->a_vpp != NULL)
343 1.8 mycroft *ap->a_vpp = ap->a_vp;
344 1.8 mycroft if (ap->a_bnp != NULL)
345 1.8 mycroft *ap->a_bnp = ap->a_bn;
346 1.1 cgd return (0);
347 1.1 cgd }
348 1.1 cgd
349 1.1 cgd /*
350 1.1 cgd * At the moment we do not do any locking.
351 1.1 cgd */
352 1.1 cgd /* ARGSUSED */
353 1.8 mycroft fifo_lock(ap)
354 1.8 mycroft struct vop_lock_args /* {
355 1.8 mycroft struct vnode *a_vp;
356 1.8 mycroft } */ *ap;
357 1.1 cgd {
358 1.1 cgd
359 1.1 cgd return (0);
360 1.1 cgd }
361 1.1 cgd
362 1.1 cgd /* ARGSUSED */
363 1.8 mycroft fifo_unlock(ap)
364 1.8 mycroft struct vop_unlock_args /* {
365 1.8 mycroft struct vnode *a_vp;
366 1.8 mycroft } */ *ap;
367 1.1 cgd {
368 1.1 cgd
369 1.1 cgd return (0);
370 1.1 cgd }
371 1.1 cgd
372 1.1 cgd /*
373 1.1 cgd * Device close routine
374 1.1 cgd */
375 1.1 cgd /* ARGSUSED */
376 1.8 mycroft fifo_close(ap)
377 1.8 mycroft struct vop_close_args /* {
378 1.8 mycroft struct vnode *a_vp;
379 1.8 mycroft int a_fflag;
380 1.8 mycroft struct ucred *a_cred;
381 1.8 mycroft struct proc *a_p;
382 1.8 mycroft } */ *ap;
383 1.1 cgd {
384 1.8 mycroft register struct vnode *vp = ap->a_vp;
385 1.1 cgd register struct fifoinfo *fip = vp->v_fifoinfo;
386 1.1 cgd int error1, error2;
387 1.1 cgd
388 1.8 mycroft if (ap->a_fflag & FWRITE) {
389 1.1 cgd fip->fi_writers--;
390 1.1 cgd if (fip->fi_writers == 0)
391 1.1 cgd socantrcvmore(fip->fi_readsock);
392 1.1 cgd } else {
393 1.1 cgd fip->fi_readers--;
394 1.1 cgd if (fip->fi_readers == 0)
395 1.1 cgd socantsendmore(fip->fi_writesock);
396 1.1 cgd }
397 1.1 cgd if (vp->v_usecount > 1)
398 1.1 cgd return (0);
399 1.1 cgd error1 = soclose(fip->fi_readsock);
400 1.1 cgd error2 = soclose(fip->fi_writesock);
401 1.1 cgd FREE(fip, M_VNODE);
402 1.1 cgd vp->v_fifoinfo = NULL;
403 1.1 cgd if (error1)
404 1.1 cgd return (error1);
405 1.1 cgd return (error2);
406 1.1 cgd }
407 1.1 cgd
408 1.1 cgd /*
409 1.1 cgd * Print out the contents of a fifo vnode.
410 1.1 cgd */
411 1.8 mycroft fifo_print(ap)
412 1.8 mycroft struct vop_print_args /* {
413 1.8 mycroft struct vnode *a_vp;
414 1.8 mycroft } */ *ap;
415 1.1 cgd {
416 1.1 cgd
417 1.1 cgd printf("tag VT_NON");
418 1.8 mycroft fifo_printinfo(ap->a_vp);
419 1.1 cgd printf("\n");
420 1.1 cgd }
421 1.1 cgd
422 1.1 cgd /*
423 1.1 cgd * Print out internal contents of a fifo vnode.
424 1.1 cgd */
425 1.1 cgd fifo_printinfo(vp)
426 1.1 cgd struct vnode *vp;
427 1.1 cgd {
428 1.1 cgd register struct fifoinfo *fip = vp->v_fifoinfo;
429 1.1 cgd
430 1.1 cgd printf(", fifo with %d readers and %d writers",
431 1.1 cgd fip->fi_readers, fip->fi_writers);
432 1.1 cgd }
433 1.1 cgd
434 1.1 cgd /*
435 1.8 mycroft * Return POSIX pathconf information applicable to fifo's.
436 1.8 mycroft */
437 1.8 mycroft fifo_pathconf(ap)
438 1.8 mycroft struct vop_pathconf_args /* {
439 1.8 mycroft struct vnode *a_vp;
440 1.8 mycroft int a_name;
441 1.8 mycroft int *a_retval;
442 1.8 mycroft } */ *ap;
443 1.8 mycroft {
444 1.8 mycroft
445 1.8 mycroft switch (ap->a_name) {
446 1.8 mycroft case _PC_LINK_MAX:
447 1.8 mycroft *ap->a_retval = LINK_MAX;
448 1.8 mycroft return (0);
449 1.8 mycroft case _PC_PIPE_BUF:
450 1.8 mycroft *ap->a_retval = PIPE_BUF;
451 1.8 mycroft return (0);
452 1.8 mycroft case _PC_CHOWN_RESTRICTED:
453 1.8 mycroft *ap->a_retval = 1;
454 1.8 mycroft return (0);
455 1.8 mycroft default:
456 1.8 mycroft return (EINVAL);
457 1.8 mycroft }
458 1.8 mycroft /* NOTREACHED */
459 1.8 mycroft }
460 1.8 mycroft
461 1.8 mycroft /*
462 1.1 cgd * Fifo failed operation
463 1.1 cgd */
464 1.1 cgd fifo_ebadf()
465 1.1 cgd {
466 1.1 cgd
467 1.1 cgd return (EBADF);
468 1.1 cgd }
469 1.1 cgd
470 1.1 cgd /*
471 1.1 cgd * Fifo advisory byte-level locks.
472 1.1 cgd */
473 1.1 cgd /* ARGSUSED */
474 1.8 mycroft fifo_advlock(ap)
475 1.8 mycroft struct vop_advlock_args /* {
476 1.8 mycroft struct vnode *a_vp;
477 1.8 mycroft caddr_t a_id;
478 1.8 mycroft int a_op;
479 1.8 mycroft struct flock *a_fl;
480 1.8 mycroft int a_flags;
481 1.8 mycroft } */ *ap;
482 1.1 cgd {
483 1.1 cgd
484 1.1 cgd return (EOPNOTSUPP);
485 1.1 cgd }
486 1.1 cgd
487 1.1 cgd /*
488 1.1 cgd * Fifo bad operation
489 1.1 cgd */
490 1.1 cgd fifo_badop()
491 1.1 cgd {
492 1.1 cgd
493 1.1 cgd panic("fifo_badop called");
494 1.1 cgd /* NOTREACHED */
495 1.1 cgd }
496