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6 * modification, are permitted provided that the following conditions
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15 * This product includes software developed by the University of
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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 $
35 * $DragonFly: src/sys/vfs/fifofs/fifo_vnops.c,v 1.14 2004/04/06 21:32:39 cpressey Exp $
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/unistd.h>
41 #include <sys/kernel.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>
50 #include <sys/event.h>
56 * This structure is associated with the FIFO vnode and stores
57 * the state associated with the FIFO.
60 struct socket *fi_readsock;
61 struct socket *fi_writesock;
66 static int fifo_badop (void);
67 static int fifo_print (struct vop_print_args *);
68 static int fifo_lookup (struct vop_lookup_args *);
69 static int fifo_open (struct vop_open_args *);
70 static int fifo_close (struct vop_close_args *);
71 static int fifo_read (struct vop_read_args *);
72 static int fifo_write (struct vop_write_args *);
73 static int fifo_ioctl (struct vop_ioctl_args *);
74 static int fifo_poll (struct vop_poll_args *);
75 static int fifo_kqfilter (struct vop_kqfilter_args *);
76 static int fifo_inactive (struct vop_inactive_args *);
77 static int fifo_bmap (struct vop_bmap_args *);
78 static int fifo_pathconf (struct vop_pathconf_args *);
79 static int fifo_advlock (struct vop_advlock_args *);
81 static void filt_fifordetach(struct knote *kn);
82 static int filt_fiforead(struct knote *kn, long hint);
83 static void filt_fifowdetach(struct knote *kn);
84 static int filt_fifowrite(struct knote *kn, long hint);
86 static struct filterops fiforead_filtops =
87 { 1, NULL, filt_fifordetach, filt_fiforead };
88 static struct filterops fifowrite_filtops =
89 { 1, NULL, filt_fifowdetach, filt_fifowrite };
91 vop_t **fifo_vnodeop_p;
92 static 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 },
125 static struct vnodeopv_desc fifo_vnodeop_opv_desc =
126 { &fifo_vnodeop_p, fifo_vnodeop_entries };
128 VNODEOP_SET(fifo_vnodeop_opv_desc);
131 * fifo_vnoperate(struct vnodeop_desc *a_desc, ...)
134 fifo_vnoperate(struct vop_generic_args *ap)
136 return (VOCALL(fifo_vnodeop_p, ap->a_desc->vdesc_offset, ap));
140 * Trivial lookup routine that always fails.
142 * fifo_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
143 * struct componentname *a_cnp)
147 fifo_lookup(struct vop_lookup_args *ap)
154 * Open called to set up a new instance of a fifo or
155 * to find an active instance of a fifo.
157 * fifo_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
158 * struct thread *a_td)
162 fifo_open(struct vop_open_args *ap)
164 struct vnode *vp = ap->a_vp;
165 struct fifoinfo *fip;
166 struct socket *rso, *wso;
169 if ((fip = vp->v_fifoinfo) == NULL) {
170 MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK);
171 vp->v_fifoinfo = fip;
172 error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, ap->a_td);
175 vp->v_fifoinfo = NULL;
178 fip->fi_readsock = rso;
179 error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, ap->a_td);
183 vp->v_fifoinfo = NULL;
186 fip->fi_writesock = wso;
187 error = unp_connect2(wso, rso);
192 vp->v_fifoinfo = NULL;
195 fip->fi_readers = fip->fi_writers = 0;
196 wso->so_snd.sb_lowat = PIPE_BUF;
197 rso->so_state |= SS_CANTRCVMORE;
199 if (ap->a_mode & FREAD) {
201 if (fip->fi_readers == 1) {
202 fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
203 if (fip->fi_writers > 0) {
204 wakeup((caddr_t)&fip->fi_writers);
205 sowwakeup(fip->fi_writesock);
209 if (ap->a_mode & FWRITE) {
211 if (fip->fi_writers == 1) {
212 fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
213 if (fip->fi_readers > 0) {
214 wakeup((caddr_t)&fip->fi_readers);
215 sorwakeup(fip->fi_writesock);
219 if ((ap->a_mode & FREAD) && (ap->a_mode & O_NONBLOCK) == 0) {
220 if (fip->fi_writers == 0) {
221 VOP_UNLOCK(vp, NULL, 0, ap->a_td);
222 error = tsleep((caddr_t)&fip->fi_readers,
223 PCATCH, "fifoor", 0);
224 vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, ap->a_td);
228 * We must have got woken up because we had a writer.
229 * That (and not still having one) is the condition
230 * that we must wait for.
234 if (ap->a_mode & FWRITE) {
235 if (ap->a_mode & O_NONBLOCK) {
236 if (fip->fi_readers == 0) {
241 if (fip->fi_readers == 0) {
242 VOP_UNLOCK(vp, NULL, 0, ap->a_td);
243 error = tsleep((caddr_t)&fip->fi_writers,
244 PCATCH, "fifoow", 0);
245 vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, ap->a_td);
249 * We must have got woken up because we had
250 * a reader. That (and not still having one)
251 * is the condition that we must wait for.
258 VOP_CLOSE(vp, ap->a_mode, ap->a_td);
265 * fifo_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
266 * struct ucred *a_cred)
270 fifo_read(struct vop_read_args *ap)
272 struct uio *uio = ap->a_uio;
273 struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
274 struct thread *td = uio->uio_td;
275 int error, startresid;
278 if (uio->uio_rw != UIO_READ)
279 panic("fifo_read mode");
281 if (uio->uio_resid == 0)
283 if (ap->a_ioflag & IO_NDELAY)
284 rso->so_state |= SS_NBIO;
285 startresid = uio->uio_resid;
286 VOP_UNLOCK(ap->a_vp, NULL, 0, td);
287 error = soreceive(rso, (struct sockaddr **)0, uio, (struct mbuf **)0,
288 (struct mbuf **)0, (int *)0);
289 vn_lock(ap->a_vp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
290 if (ap->a_ioflag & IO_NDELAY)
291 rso->so_state &= ~SS_NBIO;
298 * fifo_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
299 * struct ucred *a_cred)
303 fifo_write(struct vop_write_args *ap)
305 struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock;
306 struct thread *td = ap->a_uio->uio_td;
310 if (ap->a_uio->uio_rw != UIO_WRITE)
311 panic("fifo_write mode");
313 if (ap->a_ioflag & IO_NDELAY)
314 wso->so_state |= SS_NBIO;
315 VOP_UNLOCK(ap->a_vp, NULL, 0, td);
316 error = sosend(wso, (struct sockaddr *)0, ap->a_uio, 0,
317 (struct mbuf *)0, 0, td);
318 vn_lock(ap->a_vp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
319 if (ap->a_ioflag & IO_NDELAY)
320 wso->so_state &= ~SS_NBIO;
325 * Device ioctl operation.
327 * fifo_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data, int a_fflag,
328 * struct ucred *a_cred, struct thread *a_td)
332 fifo_ioctl(struct vop_ioctl_args *ap)
334 struct file filetmp; /* Local */
337 if (ap->a_command == FIONBIO)
339 if (ap->a_fflag & FREAD) {
340 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
341 error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_td);
345 if (ap->a_fflag & FWRITE) {
346 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
347 error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_td);
355 * fifo_kqfilter(struct vnode *a_vp, struct knote *a_kn)
359 fifo_kqfilter(struct vop_kqfilter_args *ap)
361 struct fifoinfo *fi = ap->a_vp->v_fifoinfo;
365 switch (ap->a_kn->kn_filter) {
367 ap->a_kn->kn_fop = &fiforead_filtops;
368 so = fi->fi_readsock;
372 ap->a_kn->kn_fop = &fifowrite_filtops;
373 so = fi->fi_writesock;
380 ap->a_kn->kn_hook = (caddr_t)so;
382 SLIST_INSERT_HEAD(&sb->sb_sel.si_note, ap->a_kn, kn_selnext);
383 sb->sb_flags |= SB_KNOTE;
389 filt_fifordetach(struct knote *kn)
391 struct socket *so = (struct socket *)kn->kn_hook;
393 SLIST_REMOVE(&so->so_rcv.sb_sel.si_note, kn, knote, kn_selnext);
394 if (SLIST_EMPTY(&so->so_rcv.sb_sel.si_note))
395 so->so_rcv.sb_flags &= ~SB_KNOTE;
399 filt_fiforead(struct knote *kn, long hint)
401 struct socket *so = (struct socket *)kn->kn_hook;
403 kn->kn_data = so->so_rcv.sb_cc;
404 if (so->so_state & SS_CANTRCVMORE) {
405 kn->kn_flags |= EV_EOF;
408 kn->kn_flags &= ~EV_EOF;
409 return (kn->kn_data > 0);
413 filt_fifowdetach(struct knote *kn)
415 struct socket *so = (struct socket *)kn->kn_hook;
417 SLIST_REMOVE(&so->so_snd.sb_sel.si_note, kn, knote, kn_selnext);
418 if (SLIST_EMPTY(&so->so_snd.sb_sel.si_note))
419 so->so_snd.sb_flags &= ~SB_KNOTE;
423 filt_fifowrite(struct knote *kn, long hint)
425 struct socket *so = (struct socket *)kn->kn_hook;
427 kn->kn_data = sbspace(&so->so_snd);
428 if (so->so_state & SS_CANTSENDMORE) {
429 kn->kn_flags |= EV_EOF;
432 kn->kn_flags &= ~EV_EOF;
433 return (kn->kn_data >= so->so_snd.sb_lowat);
437 * fifo_poll(struct vnode *a_vp, int a_events, struct ucred *a_cred,
438 * struct thread *a_td)
442 fifo_poll(struct vop_poll_args *ap)
445 int events, revents = 0;
447 events = ap->a_events &
448 (POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM | POLLRDBAND);
451 * If POLLIN or POLLRDNORM is requested and POLLINIGNEOF is
452 * not, then convert the first two to the last one. This
453 * tells the socket poll function to ignore EOF so that we
454 * block if there is no writer (and no data). Callers can
455 * set POLLINIGNEOF to get non-blocking behavior.
457 if (events & (POLLIN | POLLRDNORM) &&
458 !(events & POLLINIGNEOF)) {
459 events &= ~(POLLIN | POLLRDNORM);
460 events |= POLLINIGNEOF;
463 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
465 revents |= soo_poll(&filetmp, events, ap->a_cred,
468 /* Reverse the above conversion. */
469 if ((revents & POLLINIGNEOF) &&
470 !(ap->a_events & POLLINIGNEOF)) {
471 revents |= (ap->a_events & (POLLIN | POLLRDNORM));
472 revents &= ~POLLINIGNEOF;
475 events = ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND);
477 filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
479 revents |= soo_poll(&filetmp, events, ap->a_cred,
486 * fifo_inactive(struct vnode *a_vp, struct thread *a_td)
489 fifo_inactive(struct vop_inactive_args *ap)
491 VOP_UNLOCK(ap->a_vp, NULL, 0, ap->a_td);
496 * This is a noop, simply returning what one has been given.
498 * fifo_bmap(struct vnode *a_vp, daddr_t a_bn, struct vnode **a_vpp,
499 * daddr_t *a_bnp, int *a_runp, int *a_runb)
502 fifo_bmap(struct vop_bmap_args *ap)
504 if (ap->a_vpp != NULL)
505 *ap->a_vpp = ap->a_vp;
506 if (ap->a_bnp != NULL)
507 *ap->a_bnp = ap->a_bn;
508 if (ap->a_runp != NULL)
510 if (ap->a_runb != NULL)
516 * Device close routine
518 * fifo_close(struct vnode *a_vp, int a_fflag, struct ucred *a_cred,
519 * struct thread *a_td)
523 fifo_close(struct vop_close_args *ap)
525 struct vnode *vp = ap->a_vp;
526 struct fifoinfo *fip = vp->v_fifoinfo;
529 if (ap->a_fflag & FREAD) {
531 if (fip->fi_readers == 0)
532 socantsendmore(fip->fi_writesock);
534 if (ap->a_fflag & FWRITE) {
536 if (fip->fi_writers == 0)
537 socantrcvmore(fip->fi_readsock);
539 if (vp->v_usecount > 1)
541 error1 = soclose(fip->fi_readsock);
542 error2 = soclose(fip->fi_writesock);
544 vp->v_fifoinfo = NULL;
552 * Print out internal contents of a fifo vnode.
555 fifo_printinfo(struct vnode *vp)
557 struct fifoinfo *fip = vp->v_fifoinfo;
559 printf(", fifo with %ld readers and %ld writers",
560 fip->fi_readers, fip->fi_writers);
565 * Print out the contents of a fifo vnode.
567 * fifo_print(struct vnode *a_vp)
570 fifo_print(struct vop_print_args *ap)
572 printf("tag VT_NON");
573 fifo_printinfo(ap->a_vp);
579 * Return POSIX pathconf information applicable to fifo's.
581 * fifo_pathconf(struct vnode *a_vp, int a_name, int *a_retval)
584 fifo_pathconf(struct vop_pathconf_args *ap)
586 switch (ap->a_name) {
588 *ap->a_retval = LINK_MAX;
591 *ap->a_retval = PIPE_BUF;
593 case _PC_CHOWN_RESTRICTED:
603 * Fifo advisory byte-level locks.
605 * fifo_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, struct flock *a_fl,
610 fifo_advlock(struct vop_advlock_args *ap)
612 return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL);
621 panic("fifo_badop called");