| 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 $ |
| 35 | * $DragonFly: src/sys/vfs/fifofs/fifo_vnops.c,v 1.2 2003/06/17 04:28:42 dillon Exp $ |
| 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> |
| 53 | #include <miscfs/fifofs/fifo.h> |
| 54 | |
| 55 | /* |
| 56 | * This structure is associated with the FIFO vnode and stores |
| 57 | * the state associated with the FIFO. |
| 58 | */ |
| 59 | struct fifoinfo { |
| 60 | struct socket *fi_readsock; |
| 61 | struct socket *fi_writesock; |
| 62 | long fi_readers; |
| 63 | long fi_writers; |
| 64 | }; |
| 65 | |
| 66 | static int fifo_badop __P((void)); |
| 67 | static int fifo_print __P((struct vop_print_args *)); |
| 68 | static int fifo_lookup __P((struct vop_lookup_args *)); |
| 69 | static int fifo_open __P((struct vop_open_args *)); |
| 70 | static int fifo_close __P((struct vop_close_args *)); |
| 71 | static int fifo_read __P((struct vop_read_args *)); |
| 72 | static int fifo_write __P((struct vop_write_args *)); |
| 73 | static int fifo_ioctl __P((struct vop_ioctl_args *)); |
| 74 | static int fifo_poll __P((struct vop_poll_args *)); |
| 75 | static int fifo_kqfilter __P((struct vop_kqfilter_args *)); |
| 76 | static int fifo_inactive __P((struct vop_inactive_args *)); |
| 77 | static int fifo_bmap __P((struct vop_bmap_args *)); |
| 78 | static int fifo_pathconf __P((struct vop_pathconf_args *)); |
| 79 | static int fifo_advlock __P((struct vop_advlock_args *)); |
| 80 | |
| 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); |
| 85 | |
| 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 }; |
| 90 | |
| 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 }, |
| 123 | { NULL, NULL } |
| 124 | }; |
| 125 | static struct vnodeopv_desc fifo_vnodeop_opv_desc = |
| 126 | { &fifo_vnodeop_p, fifo_vnodeop_entries }; |
| 127 | |
| 128 | VNODEOP_SET(fifo_vnodeop_opv_desc); |
| 129 | |
| 130 | int |
| 131 | fifo_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 */ |
| 144 | static int |
| 145 | fifo_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 */ |
| 162 | static int |
| 163 | fifo_open(ap) |
| 164 | struct vop_open_args /* { |
| 165 | struct vnode *a_vp; |
| 166 | int a_mode; |
| 167 | struct ucred *a_cred; |
| 168 | struct proc *a_p; |
| 169 | } */ *ap; |
| 170 | { |
| 171 | struct vnode *vp = ap->a_vp; |
| 172 | struct fifoinfo *fip; |
| 173 | struct proc *p = ap->a_p; |
| 174 | struct socket *rso, *wso; |
| 175 | int error; |
| 176 | |
| 177 | if ((fip = vp->v_fifoinfo) == NULL) { |
| 178 | MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK); |
| 179 | vp->v_fifoinfo = fip; |
| 180 | error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, ap->a_p); |
| 181 | if (error) { |
| 182 | free(fip, M_VNODE); |
| 183 | vp->v_fifoinfo = NULL; |
| 184 | return (error); |
| 185 | } |
| 186 | fip->fi_readsock = rso; |
| 187 | error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, ap->a_p); |
| 188 | if (error) { |
| 189 | (void)soclose(rso); |
| 190 | free(fip, M_VNODE); |
| 191 | vp->v_fifoinfo = NULL; |
| 192 | return (error); |
| 193 | } |
| 194 | fip->fi_writesock = wso; |
| 195 | error = unp_connect2(wso, rso); |
| 196 | if (error) { |
| 197 | (void)soclose(wso); |
| 198 | (void)soclose(rso); |
| 199 | free(fip, M_VNODE); |
| 200 | vp->v_fifoinfo = NULL; |
| 201 | return (error); |
| 202 | } |
| 203 | fip->fi_readers = fip->fi_writers = 0; |
| 204 | wso->so_snd.sb_lowat = PIPE_BUF; |
| 205 | rso->so_state |= SS_CANTRCVMORE; |
| 206 | } |
| 207 | if (ap->a_mode & FREAD) { |
| 208 | fip->fi_readers++; |
| 209 | if (fip->fi_readers == 1) { |
| 210 | fip->fi_writesock->so_state &= ~SS_CANTSENDMORE; |
| 211 | if (fip->fi_writers > 0) { |
| 212 | wakeup((caddr_t)&fip->fi_writers); |
| 213 | sowwakeup(fip->fi_writesock); |
| 214 | } |
| 215 | } |
| 216 | } |
| 217 | if (ap->a_mode & FWRITE) { |
| 218 | fip->fi_writers++; |
| 219 | if (fip->fi_writers == 1) { |
| 220 | fip->fi_readsock->so_state &= ~SS_CANTRCVMORE; |
| 221 | if (fip->fi_readers > 0) { |
| 222 | wakeup((caddr_t)&fip->fi_readers); |
| 223 | sorwakeup(fip->fi_writesock); |
| 224 | } |
| 225 | } |
| 226 | } |
| 227 | if ((ap->a_mode & FREAD) && (ap->a_mode & O_NONBLOCK) == 0) { |
| 228 | if (fip->fi_writers == 0) { |
| 229 | VOP_UNLOCK(vp, 0, p); |
| 230 | error = tsleep((caddr_t)&fip->fi_readers, |
| 231 | PCATCH | PSOCK, "fifoor", 0); |
| 232 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); |
| 233 | if (error) |
| 234 | goto bad; |
| 235 | /* |
| 236 | * We must have got woken up because we had a writer. |
| 237 | * That (and not still having one) is the condition |
| 238 | * that we must wait for. |
| 239 | */ |
| 240 | } |
| 241 | } |
| 242 | if (ap->a_mode & FWRITE) { |
| 243 | if (ap->a_mode & O_NONBLOCK) { |
| 244 | if (fip->fi_readers == 0) { |
| 245 | error = ENXIO; |
| 246 | goto bad; |
| 247 | } |
| 248 | } else { |
| 249 | if (fip->fi_readers == 0) { |
| 250 | VOP_UNLOCK(vp, 0, p); |
| 251 | error = tsleep((caddr_t)&fip->fi_writers, |
| 252 | PCATCH | PSOCK, "fifoow", 0); |
| 253 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); |
| 254 | if (error) |
| 255 | goto bad; |
| 256 | /* |
| 257 | * We must have got woken up because we had |
| 258 | * a reader. That (and not still having one) |
| 259 | * is the condition that we must wait for. |
| 260 | */ |
| 261 | } |
| 262 | } |
| 263 | } |
| 264 | return (0); |
| 265 | bad: |
| 266 | VOP_CLOSE(vp, ap->a_mode, ap->a_cred, p); |
| 267 | return (error); |
| 268 | } |
| 269 | |
| 270 | /* |
| 271 | * Vnode op for read |
| 272 | */ |
| 273 | /* ARGSUSED */ |
| 274 | static int |
| 275 | fifo_read(ap) |
| 276 | struct vop_read_args /* { |
| 277 | struct vnode *a_vp; |
| 278 | struct uio *a_uio; |
| 279 | int a_ioflag; |
| 280 | struct ucred *a_cred; |
| 281 | } */ *ap; |
| 282 | { |
| 283 | struct uio *uio = ap->a_uio; |
| 284 | struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock; |
| 285 | struct proc *p = uio->uio_procp; |
| 286 | int error, startresid; |
| 287 | |
| 288 | #ifdef DIAGNOSTIC |
| 289 | if (uio->uio_rw != UIO_READ) |
| 290 | panic("fifo_read mode"); |
| 291 | #endif |
| 292 | if (uio->uio_resid == 0) |
| 293 | return (0); |
| 294 | if (ap->a_ioflag & IO_NDELAY) |
| 295 | rso->so_state |= SS_NBIO; |
| 296 | startresid = uio->uio_resid; |
| 297 | VOP_UNLOCK(ap->a_vp, 0, p); |
| 298 | error = soreceive(rso, (struct sockaddr **)0, uio, (struct mbuf **)0, |
| 299 | (struct mbuf **)0, (int *)0); |
| 300 | vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, p); |
| 301 | if (ap->a_ioflag & IO_NDELAY) |
| 302 | rso->so_state &= ~SS_NBIO; |
| 303 | return (error); |
| 304 | } |
| 305 | |
| 306 | /* |
| 307 | * Vnode op for write |
| 308 | */ |
| 309 | /* ARGSUSED */ |
| 310 | static int |
| 311 | fifo_write(ap) |
| 312 | struct vop_write_args /* { |
| 313 | struct vnode *a_vp; |
| 314 | struct uio *a_uio; |
| 315 | int a_ioflag; |
| 316 | struct ucred *a_cred; |
| 317 | } */ *ap; |
| 318 | { |
| 319 | struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock; |
| 320 | struct proc *p = ap->a_uio->uio_procp; |
| 321 | int error; |
| 322 | |
| 323 | #ifdef DIAGNOSTIC |
| 324 | if (ap->a_uio->uio_rw != UIO_WRITE) |
| 325 | panic("fifo_write mode"); |
| 326 | #endif |
| 327 | if (ap->a_ioflag & IO_NDELAY) |
| 328 | wso->so_state |= SS_NBIO; |
| 329 | VOP_UNLOCK(ap->a_vp, 0, p); |
| 330 | error = sosend(wso, (struct sockaddr *)0, ap->a_uio, 0, |
| 331 | (struct mbuf *)0, 0, p); |
| 332 | vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, p); |
| 333 | if (ap->a_ioflag & IO_NDELAY) |
| 334 | wso->so_state &= ~SS_NBIO; |
| 335 | return (error); |
| 336 | } |
| 337 | |
| 338 | /* |
| 339 | * Device ioctl operation. |
| 340 | */ |
| 341 | /* ARGSUSED */ |
| 342 | static int |
| 343 | fifo_ioctl(ap) |
| 344 | struct vop_ioctl_args /* { |
| 345 | struct vnode *a_vp; |
| 346 | int a_command; |
| 347 | caddr_t a_data; |
| 348 | int a_fflag; |
| 349 | struct ucred *a_cred; |
| 350 | struct proc *a_p; |
| 351 | } */ *ap; |
| 352 | { |
| 353 | struct file filetmp; |
| 354 | int error; |
| 355 | |
| 356 | if (ap->a_command == FIONBIO) |
| 357 | return (0); |
| 358 | if (ap->a_fflag & FREAD) { |
| 359 | filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock; |
| 360 | error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p); |
| 361 | if (error) |
| 362 | return (error); |
| 363 | } |
| 364 | if (ap->a_fflag & FWRITE) { |
| 365 | filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock; |
| 366 | error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p); |
| 367 | if (error) |
| 368 | return (error); |
| 369 | } |
| 370 | return (0); |
| 371 | } |
| 372 | |
| 373 | /* ARGSUSED */ |
| 374 | static int |
| 375 | fifo_kqfilter(ap) |
| 376 | struct vop_kqfilter_args /* { |
| 377 | struct vnode *a_vp; |
| 378 | struct knote *a_kn; |
| 379 | } */ *ap; |
| 380 | { |
| 381 | struct fifoinfo *fi = ap->a_vp->v_fifoinfo; |
| 382 | struct socket *so; |
| 383 | struct sockbuf *sb; |
| 384 | |
| 385 | switch (ap->a_kn->kn_filter) { |
| 386 | case EVFILT_READ: |
| 387 | ap->a_kn->kn_fop = &fiforead_filtops; |
| 388 | so = fi->fi_readsock; |
| 389 | sb = &so->so_rcv; |
| 390 | break; |
| 391 | case EVFILT_WRITE: |
| 392 | ap->a_kn->kn_fop = &fifowrite_filtops; |
| 393 | so = fi->fi_writesock; |
| 394 | sb = &so->so_snd; |
| 395 | break; |
| 396 | default: |
| 397 | return (1); |
| 398 | } |
| 399 | |
| 400 | ap->a_kn->kn_hook = (caddr_t)so; |
| 401 | |
| 402 | SLIST_INSERT_HEAD(&sb->sb_sel.si_note, ap->a_kn, kn_selnext); |
| 403 | sb->sb_flags |= SB_KNOTE; |
| 404 | |
| 405 | return (0); |
| 406 | } |
| 407 | |
| 408 | static void |
| 409 | filt_fifordetach(struct knote *kn) |
| 410 | { |
| 411 | struct socket *so = (struct socket *)kn->kn_hook; |
| 412 | |
| 413 | SLIST_REMOVE(&so->so_rcv.sb_sel.si_note, kn, knote, kn_selnext); |
| 414 | if (SLIST_EMPTY(&so->so_rcv.sb_sel.si_note)) |
| 415 | so->so_rcv.sb_flags &= ~SB_KNOTE; |
| 416 | } |
| 417 | |
| 418 | static int |
| 419 | filt_fiforead(struct knote *kn, long hint) |
| 420 | { |
| 421 | struct socket *so = (struct socket *)kn->kn_hook; |
| 422 | |
| 423 | kn->kn_data = so->so_rcv.sb_cc; |
| 424 | if (so->so_state & SS_CANTRCVMORE) { |
| 425 | kn->kn_flags |= EV_EOF; |
| 426 | return (1); |
| 427 | } |
| 428 | kn->kn_flags &= ~EV_EOF; |
| 429 | return (kn->kn_data > 0); |
| 430 | } |
| 431 | |
| 432 | static void |
| 433 | filt_fifowdetach(struct knote *kn) |
| 434 | { |
| 435 | struct socket *so = (struct socket *)kn->kn_hook; |
| 436 | |
| 437 | SLIST_REMOVE(&so->so_snd.sb_sel.si_note, kn, knote, kn_selnext); |
| 438 | if (SLIST_EMPTY(&so->so_snd.sb_sel.si_note)) |
| 439 | so->so_snd.sb_flags &= ~SB_KNOTE; |
| 440 | } |
| 441 | |
| 442 | static int |
| 443 | filt_fifowrite(struct knote *kn, long hint) |
| 444 | { |
| 445 | struct socket *so = (struct socket *)kn->kn_hook; |
| 446 | |
| 447 | kn->kn_data = sbspace(&so->so_snd); |
| 448 | if (so->so_state & SS_CANTSENDMORE) { |
| 449 | kn->kn_flags |= EV_EOF; |
| 450 | return (1); |
| 451 | } |
| 452 | kn->kn_flags &= ~EV_EOF; |
| 453 | return (kn->kn_data >= so->so_snd.sb_lowat); |
| 454 | } |
| 455 | |
| 456 | /* ARGSUSED */ |
| 457 | static int |
| 458 | fifo_poll(ap) |
| 459 | struct vop_poll_args /* { |
| 460 | struct vnode *a_vp; |
| 461 | int a_events; |
| 462 | struct ucred *a_cred; |
| 463 | struct proc *a_p; |
| 464 | } */ *ap; |
| 465 | { |
| 466 | struct file filetmp; |
| 467 | int revents = 0; |
| 468 | |
| 469 | if (ap->a_events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) { |
| 470 | filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock; |
| 471 | if (filetmp.f_data) |
| 472 | revents |= soo_poll(&filetmp, ap->a_events, ap->a_cred, |
| 473 | ap->a_p); |
| 474 | } |
| 475 | if (ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND)) { |
| 476 | filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock; |
| 477 | if (filetmp.f_data) |
| 478 | revents |= soo_poll(&filetmp, ap->a_events, ap->a_cred, |
| 479 | ap->a_p); |
| 480 | } |
| 481 | return (revents); |
| 482 | } |
| 483 | |
| 484 | static int |
| 485 | fifo_inactive(ap) |
| 486 | struct vop_inactive_args /* { |
| 487 | struct vnode *a_vp; |
| 488 | struct proc *a_p; |
| 489 | } */ *ap; |
| 490 | { |
| 491 | |
| 492 | VOP_UNLOCK(ap->a_vp, 0, ap->a_p); |
| 493 | return (0); |
| 494 | } |
| 495 | |
| 496 | /* |
| 497 | * This is a noop, simply returning what one has been given. |
| 498 | */ |
| 499 | static int |
| 500 | fifo_bmap(ap) |
| 501 | struct vop_bmap_args /* { |
| 502 | struct vnode *a_vp; |
| 503 | daddr_t a_bn; |
| 504 | struct vnode **a_vpp; |
| 505 | daddr_t *a_bnp; |
| 506 | int *a_runp; |
| 507 | int *a_runb; |
| 508 | } */ *ap; |
| 509 | { |
| 510 | |
| 511 | if (ap->a_vpp != NULL) |
| 512 | *ap->a_vpp = ap->a_vp; |
| 513 | if (ap->a_bnp != NULL) |
| 514 | *ap->a_bnp = ap->a_bn; |
| 515 | if (ap->a_runp != NULL) |
| 516 | *ap->a_runp = 0; |
| 517 | if (ap->a_runb != NULL) |
| 518 | *ap->a_runb = 0; |
| 519 | return (0); |
| 520 | } |
| 521 | |
| 522 | /* |
| 523 | * Device close routine |
| 524 | */ |
| 525 | /* ARGSUSED */ |
| 526 | static int |
| 527 | fifo_close(ap) |
| 528 | struct vop_close_args /* { |
| 529 | struct vnode *a_vp; |
| 530 | int a_fflag; |
| 531 | struct ucred *a_cred; |
| 532 | struct proc *a_p; |
| 533 | } */ *ap; |
| 534 | { |
| 535 | register struct vnode *vp = ap->a_vp; |
| 536 | register struct fifoinfo *fip = vp->v_fifoinfo; |
| 537 | int error1, error2; |
| 538 | |
| 539 | if (ap->a_fflag & FREAD) { |
| 540 | fip->fi_readers--; |
| 541 | if (fip->fi_readers == 0) |
| 542 | socantsendmore(fip->fi_writesock); |
| 543 | } |
| 544 | if (ap->a_fflag & FWRITE) { |
| 545 | fip->fi_writers--; |
| 546 | if (fip->fi_writers == 0) |
| 547 | socantrcvmore(fip->fi_readsock); |
| 548 | } |
| 549 | if (vp->v_usecount > 1) |
| 550 | return (0); |
| 551 | error1 = soclose(fip->fi_readsock); |
| 552 | error2 = soclose(fip->fi_writesock); |
| 553 | FREE(fip, M_VNODE); |
| 554 | vp->v_fifoinfo = NULL; |
| 555 | if (error1) |
| 556 | return (error1); |
| 557 | return (error2); |
| 558 | } |
| 559 | |
| 560 | |
| 561 | /* |
| 562 | * Print out internal contents of a fifo vnode. |
| 563 | */ |
| 564 | int |
| 565 | fifo_printinfo(vp) |
| 566 | struct vnode *vp; |
| 567 | { |
| 568 | register struct fifoinfo *fip = vp->v_fifoinfo; |
| 569 | |
| 570 | printf(", fifo with %ld readers and %ld writers", |
| 571 | fip->fi_readers, fip->fi_writers); |
| 572 | return (0); |
| 573 | } |
| 574 | |
| 575 | /* |
| 576 | * Print out the contents of a fifo vnode. |
| 577 | */ |
| 578 | static int |
| 579 | fifo_print(ap) |
| 580 | struct vop_print_args /* { |
| 581 | struct vnode *a_vp; |
| 582 | } */ *ap; |
| 583 | { |
| 584 | |
| 585 | printf("tag VT_NON"); |
| 586 | fifo_printinfo(ap->a_vp); |
| 587 | printf("\n"); |
| 588 | return (0); |
| 589 | } |
| 590 | |
| 591 | /* |
| 592 | * Return POSIX pathconf information applicable to fifo's. |
| 593 | */ |
| 594 | int |
| 595 | fifo_pathconf(ap) |
| 596 | struct vop_pathconf_args /* { |
| 597 | struct vnode *a_vp; |
| 598 | int a_name; |
| 599 | int *a_retval; |
| 600 | } */ *ap; |
| 601 | { |
| 602 | |
| 603 | switch (ap->a_name) { |
| 604 | case _PC_LINK_MAX: |
| 605 | *ap->a_retval = LINK_MAX; |
| 606 | return (0); |
| 607 | case _PC_PIPE_BUF: |
| 608 | *ap->a_retval = PIPE_BUF; |
| 609 | return (0); |
| 610 | case _PC_CHOWN_RESTRICTED: |
| 611 | *ap->a_retval = 1; |
| 612 | return (0); |
| 613 | default: |
| 614 | return (EINVAL); |
| 615 | } |
| 616 | /* NOTREACHED */ |
| 617 | } |
| 618 | |
| 619 | /* |
| 620 | * Fifo advisory byte-level locks. |
| 621 | */ |
| 622 | /* ARGSUSED */ |
| 623 | static int |
| 624 | fifo_advlock(ap) |
| 625 | struct vop_advlock_args /* { |
| 626 | struct vnode *a_vp; |
| 627 | caddr_t a_id; |
| 628 | int a_op; |
| 629 | struct flock *a_fl; |
| 630 | int a_flags; |
| 631 | } */ *ap; |
| 632 | { |
| 633 | |
| 634 | return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL); |
| 635 | } |
| 636 | |
| 637 | /* |
| 638 | * Fifo bad operation |
| 639 | */ |
| 640 | static int |
| 641 | fifo_badop() |
| 642 | { |
| 643 | |
| 644 | panic("fifo_badop called"); |
| 645 | /* NOTREACHED */ |
| 646 | } |