| 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 1.39 2007/08/08 00:12:51 swildner 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/thread2.h> |
| 45 | #include <sys/vnode.h> |
| 46 | #include <sys/socket.h> |
| 47 | #include <sys/socketvar.h> |
| 48 | #include <sys/filio.h> |
| 49 | #include <sys/fcntl.h> |
| 50 | #include <sys/file.h> |
| 51 | #include <sys/event.h> |
| 52 | #include <sys/poll.h> |
| 53 | #include <sys/un.h> |
| 54 | |
| 55 | #include <sys/thread2.h> |
| 56 | |
| 57 | #include "fifo.h" |
| 58 | |
| 59 | /* |
| 60 | * This structure is associated with the FIFO vnode and stores |
| 61 | * the state associated with the FIFO. |
| 62 | */ |
| 63 | struct fifoinfo { |
| 64 | struct socket *fi_readsock; |
| 65 | struct socket *fi_writesock; |
| 66 | long fi_readers; |
| 67 | long fi_writers; |
| 68 | }; |
| 69 | |
| 70 | static int fifo_badop (void); |
| 71 | static int fifo_print (struct vop_print_args *); |
| 72 | static int fifo_lookup (struct vop_old_lookup_args *); |
| 73 | static int fifo_open (struct vop_open_args *); |
| 74 | static int fifo_close (struct vop_close_args *); |
| 75 | static int fifo_read (struct vop_read_args *); |
| 76 | static int fifo_write (struct vop_write_args *); |
| 77 | static int fifo_ioctl (struct vop_ioctl_args *); |
| 78 | static int fifo_poll (struct vop_poll_args *); |
| 79 | static int fifo_kqfilter (struct vop_kqfilter_args *); |
| 80 | static int fifo_inactive (struct vop_inactive_args *); |
| 81 | static int fifo_bmap (struct vop_bmap_args *); |
| 82 | static int fifo_pathconf (struct vop_pathconf_args *); |
| 83 | static int fifo_advlock (struct vop_advlock_args *); |
| 84 | |
| 85 | static void filt_fifordetach(struct knote *kn); |
| 86 | static int filt_fiforead(struct knote *kn, long hint); |
| 87 | static void filt_fifowdetach(struct knote *kn); |
| 88 | static int filt_fifowrite(struct knote *kn, long hint); |
| 89 | |
| 90 | static struct filterops fiforead_filtops = |
| 91 | { 1, NULL, filt_fifordetach, filt_fiforead }; |
| 92 | static struct filterops fifowrite_filtops = |
| 93 | { 1, NULL, filt_fifowdetach, filt_fifowrite }; |
| 94 | |
| 95 | struct vop_ops fifo_vnode_vops = { |
| 96 | .vop_default = vop_defaultop, |
| 97 | .vop_access = (void *)vop_ebadf, |
| 98 | .vop_advlock = fifo_advlock, |
| 99 | .vop_bmap = fifo_bmap, |
| 100 | .vop_close = fifo_close, |
| 101 | .vop_old_create = (void *)fifo_badop, |
| 102 | .vop_getattr = (void *)vop_ebadf, |
| 103 | .vop_inactive = fifo_inactive, |
| 104 | .vop_ioctl = fifo_ioctl, |
| 105 | .vop_kqfilter = fifo_kqfilter, |
| 106 | .vop_old_link = (void *)fifo_badop, |
| 107 | .vop_old_lookup = fifo_lookup, |
| 108 | .vop_old_mkdir = (void *)fifo_badop, |
| 109 | .vop_old_mknod = (void *)fifo_badop, |
| 110 | .vop_open = fifo_open, |
| 111 | .vop_pathconf = fifo_pathconf, |
| 112 | .vop_poll = fifo_poll, |
| 113 | .vop_print = fifo_print, |
| 114 | .vop_read = fifo_read, |
| 115 | .vop_readdir = (void *)fifo_badop, |
| 116 | .vop_readlink = (void *)fifo_badop, |
| 117 | .vop_reallocblks = (void *)fifo_badop, |
| 118 | .vop_reclaim = (void *)vop_null, |
| 119 | .vop_old_remove = (void *)fifo_badop, |
| 120 | .vop_old_rename = (void *)fifo_badop, |
| 121 | .vop_old_rmdir = (void *)fifo_badop, |
| 122 | .vop_setattr = (void *)vop_ebadf, |
| 123 | .vop_old_symlink = (void *)fifo_badop, |
| 124 | .vop_write = fifo_write |
| 125 | }; |
| 126 | |
| 127 | VNODEOP_SET(fifo_vnode_vops); |
| 128 | |
| 129 | static MALLOC_DEFINE(M_FIFOINFO, "Fifo info", "Fifo info entries"); |
| 130 | |
| 131 | /* |
| 132 | * fifo_vnoperate() |
| 133 | */ |
| 134 | int |
| 135 | fifo_vnoperate(struct vop_generic_args *ap) |
| 136 | { |
| 137 | return (VOCALL(&fifo_vnode_vops, ap)); |
| 138 | } |
| 139 | |
| 140 | /* |
| 141 | * Trivial lookup routine that always fails. |
| 142 | * |
| 143 | * fifo_lookup(struct vnode *a_dvp, struct vnode **a_vpp, |
| 144 | * struct componentname *a_cnp) |
| 145 | */ |
| 146 | /* ARGSUSED */ |
| 147 | static int |
| 148 | fifo_lookup(struct vop_old_lookup_args *ap) |
| 149 | { |
| 150 | *ap->a_vpp = NULL; |
| 151 | return (ENOTDIR); |
| 152 | } |
| 153 | |
| 154 | /* |
| 155 | * Open called to set up a new instance of a fifo or |
| 156 | * to find an active instance of a fifo. |
| 157 | * |
| 158 | * fifo_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred, |
| 159 | * struct file *a_fp) |
| 160 | */ |
| 161 | /* ARGSUSED */ |
| 162 | static int |
| 163 | fifo_open(struct vop_open_args *ap) |
| 164 | { |
| 165 | struct thread *td = curthread; |
| 166 | struct vnode *vp = ap->a_vp; |
| 167 | struct fifoinfo *fip; |
| 168 | struct socket *rso, *wso; |
| 169 | int error; |
| 170 | |
| 171 | if ((fip = vp->v_fifoinfo) == NULL) { |
| 172 | MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_FIFOINFO, M_WAITOK); |
| 173 | vp->v_fifoinfo = fip; |
| 174 | error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, td); |
| 175 | if (error) { |
| 176 | kfree(fip, M_FIFOINFO); |
| 177 | vp->v_fifoinfo = NULL; |
| 178 | return (error); |
| 179 | } |
| 180 | fip->fi_readsock = rso; |
| 181 | error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, td); |
| 182 | if (error) { |
| 183 | soclose(rso, FNONBLOCK); |
| 184 | kfree(fip, M_FIFOINFO); |
| 185 | vp->v_fifoinfo = NULL; |
| 186 | return (error); |
| 187 | } |
| 188 | fip->fi_writesock = wso; |
| 189 | error = unp_connect2(wso, rso); |
| 190 | if (error) { |
| 191 | soclose(wso, FNONBLOCK); |
| 192 | soclose(rso, FNONBLOCK); |
| 193 | kfree(fip, M_FIFOINFO); |
| 194 | vp->v_fifoinfo = NULL; |
| 195 | return (error); |
| 196 | } |
| 197 | fip->fi_readers = fip->fi_writers = 0; |
| 198 | wso->so_snd.ssb_lowat = PIPE_BUF; |
| 199 | rso->so_state |= SS_CANTRCVMORE; |
| 200 | } |
| 201 | if (ap->a_mode & FREAD) { |
| 202 | fip->fi_readers++; |
| 203 | if (fip->fi_readers == 1) { |
| 204 | fip->fi_writesock->so_state &= ~SS_CANTSENDMORE; |
| 205 | if (fip->fi_writers > 0) { |
| 206 | wakeup((caddr_t)&fip->fi_writers); |
| 207 | sowwakeup(fip->fi_writesock); |
| 208 | } |
| 209 | } |
| 210 | } |
| 211 | if (ap->a_mode & FWRITE) { |
| 212 | fip->fi_writers++; |
| 213 | if (fip->fi_writers == 1) { |
| 214 | fip->fi_readsock->so_state &= ~SS_CANTRCVMORE; |
| 215 | if (fip->fi_readers > 0) { |
| 216 | wakeup((caddr_t)&fip->fi_readers); |
| 217 | sorwakeup(fip->fi_writesock); |
| 218 | } |
| 219 | } |
| 220 | } |
| 221 | if ((ap->a_mode & FREAD) && (ap->a_mode & O_NONBLOCK) == 0) { |
| 222 | if (fip->fi_writers == 0) { |
| 223 | vn_unlock(vp); |
| 224 | error = tsleep((caddr_t)&fip->fi_readers, |
| 225 | PCATCH, "fifoor", 0); |
| 226 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 227 | if (error) |
| 228 | goto bad; |
| 229 | /* |
| 230 | * We must have got woken up because we had a writer. |
| 231 | * That (and not still having one) is the condition |
| 232 | * that we must wait for. |
| 233 | */ |
| 234 | } |
| 235 | } |
| 236 | if (ap->a_mode & FWRITE) { |
| 237 | if (ap->a_mode & O_NONBLOCK) { |
| 238 | if (fip->fi_readers == 0) { |
| 239 | error = ENXIO; |
| 240 | goto bad; |
| 241 | } |
| 242 | } else { |
| 243 | if (fip->fi_readers == 0) { |
| 244 | vn_unlock(vp); |
| 245 | error = tsleep((caddr_t)&fip->fi_writers, |
| 246 | PCATCH, "fifoow", 0); |
| 247 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 248 | if (error) |
| 249 | goto bad; |
| 250 | /* |
| 251 | * We must have got woken up because we had |
| 252 | * a reader. That (and not still having one) |
| 253 | * is the condition that we must wait for. |
| 254 | */ |
| 255 | } |
| 256 | } |
| 257 | } |
| 258 | return (vop_stdopen(ap)); |
| 259 | bad: |
| 260 | vop_stdopen(ap); /* bump opencount/writecount as appropriate */ |
| 261 | VOP_CLOSE(vp, ap->a_mode); |
| 262 | return (error); |
| 263 | } |
| 264 | |
| 265 | /* |
| 266 | * Vnode op for read |
| 267 | * |
| 268 | * fifo_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, |
| 269 | * struct ucred *a_cred) |
| 270 | */ |
| 271 | /* ARGSUSED */ |
| 272 | static int |
| 273 | fifo_read(struct vop_read_args *ap) |
| 274 | { |
| 275 | struct uio *uio = ap->a_uio; |
| 276 | struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock; |
| 277 | int error, startresid; |
| 278 | int flags; |
| 279 | |
| 280 | #ifdef DIAGNOSTIC |
| 281 | if (uio->uio_rw != UIO_READ) |
| 282 | panic("fifo_read mode"); |
| 283 | #endif |
| 284 | if (uio->uio_resid == 0) |
| 285 | return (0); |
| 286 | if (ap->a_ioflag & IO_NDELAY) |
| 287 | flags = MSG_FNONBLOCKING; |
| 288 | else |
| 289 | flags = 0; |
| 290 | startresid = uio->uio_resid; |
| 291 | vn_unlock(ap->a_vp); |
| 292 | error = soreceive(rso, NULL, uio, NULL, NULL, &flags); |
| 293 | vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY); |
| 294 | return (error); |
| 295 | } |
| 296 | |
| 297 | /* |
| 298 | * Vnode op for write |
| 299 | * |
| 300 | * fifo_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, |
| 301 | * struct ucred *a_cred) |
| 302 | */ |
| 303 | /* ARGSUSED */ |
| 304 | static int |
| 305 | fifo_write(struct vop_write_args *ap) |
| 306 | { |
| 307 | struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock; |
| 308 | struct thread *td = ap->a_uio->uio_td; |
| 309 | int error; |
| 310 | int flags; |
| 311 | |
| 312 | #ifdef DIAGNOSTIC |
| 313 | if (ap->a_uio->uio_rw != UIO_WRITE) |
| 314 | panic("fifo_write mode"); |
| 315 | #endif |
| 316 | if (ap->a_ioflag & IO_NDELAY) |
| 317 | flags = MSG_FNONBLOCKING; |
| 318 | else |
| 319 | flags = 0; |
| 320 | vn_unlock(ap->a_vp); |
| 321 | error = sosend(wso, (struct sockaddr *)0, ap->a_uio, 0, |
| 322 | (struct mbuf *)0, flags, td); |
| 323 | vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY); |
| 324 | return (error); |
| 325 | } |
| 326 | |
| 327 | /* |
| 328 | * Device ioctl operation. |
| 329 | * |
| 330 | * fifo_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data, int a_fflag, |
| 331 | * struct ucred *a_cred) |
| 332 | */ |
| 333 | /* ARGSUSED */ |
| 334 | static int |
| 335 | fifo_ioctl(struct vop_ioctl_args *ap) |
| 336 | { |
| 337 | struct file filetmp; /* Local */ |
| 338 | int error; |
| 339 | |
| 340 | if (ap->a_fflag & FREAD) { |
| 341 | filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock; |
| 342 | error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_cred); |
| 343 | if (error) |
| 344 | return (error); |
| 345 | } |
| 346 | if (ap->a_fflag & FWRITE) { |
| 347 | filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock; |
| 348 | error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_cred); |
| 349 | if (error) |
| 350 | return (error); |
| 351 | } |
| 352 | return (0); |
| 353 | } |
| 354 | |
| 355 | /* |
| 356 | * fifo_kqfilter(struct vnode *a_vp, struct knote *a_kn) |
| 357 | */ |
| 358 | /* ARGSUSED */ |
| 359 | static int |
| 360 | fifo_kqfilter(struct vop_kqfilter_args *ap) |
| 361 | { |
| 362 | struct fifoinfo *fi = ap->a_vp->v_fifoinfo; |
| 363 | struct socket *so; |
| 364 | struct signalsockbuf *ssb; |
| 365 | |
| 366 | switch (ap->a_kn->kn_filter) { |
| 367 | case EVFILT_READ: |
| 368 | ap->a_kn->kn_fop = &fiforead_filtops; |
| 369 | so = fi->fi_readsock; |
| 370 | ssb = &so->so_rcv; |
| 371 | break; |
| 372 | case EVFILT_WRITE: |
| 373 | ap->a_kn->kn_fop = &fifowrite_filtops; |
| 374 | so = fi->fi_writesock; |
| 375 | ssb = &so->so_snd; |
| 376 | break; |
| 377 | default: |
| 378 | return (1); |
| 379 | } |
| 380 | |
| 381 | ap->a_kn->kn_hook = (caddr_t)so; |
| 382 | |
| 383 | ssb_insert_knote(ssb, ap->a_kn); |
| 384 | |
| 385 | return (0); |
| 386 | } |
| 387 | |
| 388 | static void |
| 389 | filt_fifordetach(struct knote *kn) |
| 390 | { |
| 391 | struct socket *so = (struct socket *)kn->kn_hook; |
| 392 | |
| 393 | ssb_remove_knote(&so->so_rcv, kn); |
| 394 | } |
| 395 | |
| 396 | static int |
| 397 | filt_fiforead(struct knote *kn, long hint) |
| 398 | { |
| 399 | struct socket *so = (struct socket *)kn->kn_hook; |
| 400 | |
| 401 | kn->kn_data = so->so_rcv.ssb_cc; |
| 402 | if (so->so_state & SS_CANTRCVMORE) { |
| 403 | kn->kn_flags |= EV_EOF; |
| 404 | return (1); |
| 405 | } |
| 406 | kn->kn_flags &= ~EV_EOF; |
| 407 | return (kn->kn_data > 0); |
| 408 | } |
| 409 | |
| 410 | static void |
| 411 | filt_fifowdetach(struct knote *kn) |
| 412 | { |
| 413 | struct socket *so = (struct socket *)kn->kn_hook; |
| 414 | |
| 415 | ssb_remove_knote(&so->so_snd, kn); |
| 416 | } |
| 417 | |
| 418 | static int |
| 419 | filt_fifowrite(struct knote *kn, long hint) |
| 420 | { |
| 421 | struct socket *so = (struct socket *)kn->kn_hook; |
| 422 | |
| 423 | kn->kn_data = ssb_space(&so->so_snd); |
| 424 | if (so->so_state & SS_CANTSENDMORE) { |
| 425 | kn->kn_flags |= EV_EOF; |
| 426 | return (1); |
| 427 | } |
| 428 | kn->kn_flags &= ~EV_EOF; |
| 429 | return (kn->kn_data >= so->so_snd.ssb_lowat); |
| 430 | } |
| 431 | |
| 432 | /* |
| 433 | * fifo_poll(struct vnode *a_vp, int a_events, struct ucred *a_cred) |
| 434 | */ |
| 435 | /* ARGSUSED */ |
| 436 | static int |
| 437 | fifo_poll(struct vop_poll_args *ap) |
| 438 | { |
| 439 | struct file filetmp; |
| 440 | int events, revents = 0; |
| 441 | |
| 442 | events = ap->a_events & |
| 443 | (POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM | POLLRDBAND); |
| 444 | if (events) { |
| 445 | /* |
| 446 | * If POLLIN or POLLRDNORM is requested and POLLINIGNEOF is |
| 447 | * not, then convert the first two to the last one. This |
| 448 | * tells the socket poll function to ignore EOF so that we |
| 449 | * block if there is no writer (and no data). Callers can |
| 450 | * set POLLINIGNEOF to get non-blocking behavior. |
| 451 | */ |
| 452 | if (events & (POLLIN | POLLRDNORM) && |
| 453 | !(events & POLLINIGNEOF)) { |
| 454 | events &= ~(POLLIN | POLLRDNORM); |
| 455 | events |= POLLINIGNEOF; |
| 456 | } |
| 457 | |
| 458 | filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock; |
| 459 | if (filetmp.f_data) |
| 460 | revents |= soo_poll(&filetmp, events, ap->a_cred); |
| 461 | |
| 462 | /* Reverse the above conversion. */ |
| 463 | if ((revents & POLLINIGNEOF) && |
| 464 | !(ap->a_events & POLLINIGNEOF)) { |
| 465 | revents |= (ap->a_events & (POLLIN | POLLRDNORM)); |
| 466 | revents &= ~POLLINIGNEOF; |
| 467 | } |
| 468 | } |
| 469 | events = ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND); |
| 470 | if (events) { |
| 471 | filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock; |
| 472 | if (filetmp.f_data) |
| 473 | revents |= soo_poll(&filetmp, events, ap->a_cred); |
| 474 | } |
| 475 | return (revents); |
| 476 | } |
| 477 | |
| 478 | /* |
| 479 | * fifo_inactive(struct vnode *a_vp) |
| 480 | */ |
| 481 | static int |
| 482 | fifo_inactive(struct vop_inactive_args *ap) |
| 483 | { |
| 484 | return (0); |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | * This is a noop, simply returning what one has been given. |
| 489 | * |
| 490 | * fifo_bmap(struct vnode *a_vp, off_t a_loffset, struct vnode **a_vpp, |
| 491 | * off_t *a_doffsetp, int *a_runp, int *a_runb) |
| 492 | */ |
| 493 | static int |
| 494 | fifo_bmap(struct vop_bmap_args *ap) |
| 495 | { |
| 496 | if (ap->a_vpp != NULL) |
| 497 | *ap->a_vpp = ap->a_vp; |
| 498 | if (ap->a_doffsetp != NULL) |
| 499 | *ap->a_doffsetp = ap->a_loffset; |
| 500 | if (ap->a_runp != NULL) |
| 501 | *ap->a_runp = 0; |
| 502 | if (ap->a_runb != NULL) |
| 503 | *ap->a_runb = 0; |
| 504 | return (0); |
| 505 | } |
| 506 | |
| 507 | /* |
| 508 | * Device close routine |
| 509 | * |
| 510 | * fifo_close(struct vnode *a_vp, int a_fflag) |
| 511 | */ |
| 512 | /* ARGSUSED */ |
| 513 | static int |
| 514 | fifo_close(struct vop_close_args *ap) |
| 515 | { |
| 516 | struct vnode *vp = ap->a_vp; |
| 517 | struct fifoinfo *fip = vp->v_fifoinfo; |
| 518 | int error1, error2; |
| 519 | |
| 520 | if (ap->a_fflag & FREAD) { |
| 521 | fip->fi_readers--; |
| 522 | if (fip->fi_readers == 0) |
| 523 | socantsendmore(fip->fi_writesock); |
| 524 | } |
| 525 | if (ap->a_fflag & FWRITE) { |
| 526 | fip->fi_writers--; |
| 527 | if (fip->fi_writers == 0) |
| 528 | socantrcvmore(fip->fi_readsock); |
| 529 | } |
| 530 | if (vp->v_sysref.refcnt > 1) { |
| 531 | vop_stdclose(ap); |
| 532 | return (0); |
| 533 | } |
| 534 | error1 = soclose(fip->fi_readsock, FNONBLOCK); |
| 535 | error2 = soclose(fip->fi_writesock, FNONBLOCK); |
| 536 | FREE(fip, M_FIFOINFO); |
| 537 | vp->v_fifoinfo = NULL; |
| 538 | if (error1) |
| 539 | return (error1); |
| 540 | vop_stdclose(ap); |
| 541 | return (error2); |
| 542 | } |
| 543 | |
| 544 | |
| 545 | /* |
| 546 | * Print out internal contents of a fifo vnode. |
| 547 | */ |
| 548 | int |
| 549 | fifo_printinfo(struct vnode *vp) |
| 550 | { |
| 551 | struct fifoinfo *fip = vp->v_fifoinfo; |
| 552 | |
| 553 | kprintf(", fifo with %ld readers and %ld writers", |
| 554 | fip->fi_readers, fip->fi_writers); |
| 555 | return (0); |
| 556 | } |
| 557 | |
| 558 | /* |
| 559 | * Print out the contents of a fifo vnode. |
| 560 | * |
| 561 | * fifo_print(struct vnode *a_vp) |
| 562 | */ |
| 563 | static int |
| 564 | fifo_print(struct vop_print_args *ap) |
| 565 | { |
| 566 | kprintf("tag VT_NON"); |
| 567 | fifo_printinfo(ap->a_vp); |
| 568 | kprintf("\n"); |
| 569 | return (0); |
| 570 | } |
| 571 | |
| 572 | /* |
| 573 | * Return POSIX pathconf information applicable to fifo's. |
| 574 | * |
| 575 | * fifo_pathconf(struct vnode *a_vp, int a_name, int *a_retval) |
| 576 | */ |
| 577 | int |
| 578 | fifo_pathconf(struct vop_pathconf_args *ap) |
| 579 | { |
| 580 | switch (ap->a_name) { |
| 581 | case _PC_LINK_MAX: |
| 582 | *ap->a_retval = LINK_MAX; |
| 583 | return (0); |
| 584 | case _PC_PIPE_BUF: |
| 585 | *ap->a_retval = PIPE_BUF; |
| 586 | return (0); |
| 587 | case _PC_CHOWN_RESTRICTED: |
| 588 | *ap->a_retval = 1; |
| 589 | return (0); |
| 590 | default: |
| 591 | return (EINVAL); |
| 592 | } |
| 593 | /* NOTREACHED */ |
| 594 | } |
| 595 | |
| 596 | /* |
| 597 | * Fifo advisory byte-level locks. |
| 598 | * |
| 599 | * fifo_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, struct flock *a_fl, |
| 600 | * int a_flags) |
| 601 | */ |
| 602 | /* ARGSUSED */ |
| 603 | static int |
| 604 | fifo_advlock(struct vop_advlock_args *ap) |
| 605 | { |
| 606 | return ((ap->a_flags & F_POSIX) ? EINVAL : EOPNOTSUPP); |
| 607 | } |
| 608 | |
| 609 | /* |
| 610 | * Fifo bad operation |
| 611 | */ |
| 612 | static int |
| 613 | fifo_badop(void) |
| 614 | { |
| 615 | panic("fifo_badop called"); |
| 616 | /* NOTREACHED */ |
| 617 | } |