| 1 | /* $NetBSD: fifo_vnops.c,v 1.77 2014/08/09 05:33:01 rtr Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2008 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 17 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 18 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 19 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 20 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 26 | * POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | /* |
| 30 | * Copyright (c) 1990, 1993, 1995 |
| 31 | * The Regents of the University of California. All rights reserved. |
| 32 | * |
| 33 | * Redistribution and use in source and binary forms, with or without |
| 34 | * modification, are permitted provided that the following conditions |
| 35 | * are met: |
| 36 | * 1. Redistributions of source code must retain the above copyright |
| 37 | * notice, this list of conditions and the following disclaimer. |
| 38 | * 2. Redistributions in binary form must reproduce the above copyright |
| 39 | * notice, this list of conditions and the following disclaimer in the |
| 40 | * documentation and/or other materials provided with the distribution. |
| 41 | * 3. Neither the name of the University nor the names of its contributors |
| 42 | * may be used to endorse or promote products derived from this software |
| 43 | * without specific prior written permission. |
| 44 | * |
| 45 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 46 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 47 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 48 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 49 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 50 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 51 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 52 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 53 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 54 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 55 | * SUCH DAMAGE. |
| 56 | * |
| 57 | * @(#)fifo_vnops.c 8.10 (Berkeley) 5/27/95 |
| 58 | */ |
| 59 | |
| 60 | #include <sys/cdefs.h> |
| 61 | __KERNEL_RCSID(0, "$NetBSD: fifo_vnops.c,v 1.77 2014/08/09 05:33:01 rtr Exp $" ); |
| 62 | |
| 63 | #include <sys/param.h> |
| 64 | #include <sys/systm.h> |
| 65 | #include <sys/proc.h> |
| 66 | #include <sys/time.h> |
| 67 | #include <sys/namei.h> |
| 68 | #include <sys/vnode.h> |
| 69 | #include <sys/socket.h> |
| 70 | #include <sys/protosw.h> |
| 71 | #include <sys/socketvar.h> |
| 72 | #include <sys/stat.h> |
| 73 | #include <sys/ioctl.h> |
| 74 | #include <sys/file.h> |
| 75 | #include <sys/errno.h> |
| 76 | #include <sys/kmem.h> |
| 77 | #include <sys/un.h> |
| 78 | #include <sys/poll.h> |
| 79 | #include <sys/event.h> |
| 80 | #include <sys/condvar.h> |
| 81 | |
| 82 | #include <miscfs/fifofs/fifo.h> |
| 83 | #include <miscfs/genfs/genfs.h> |
| 84 | |
| 85 | /* |
| 86 | * This structure is associated with the FIFO vnode and stores |
| 87 | * the state associated with the FIFO. |
| 88 | */ |
| 89 | struct fifoinfo { |
| 90 | struct socket *fi_readsock; |
| 91 | struct socket *fi_writesock; |
| 92 | kcondvar_t fi_rcv; |
| 93 | int fi_readers; |
| 94 | kcondvar_t fi_wcv; |
| 95 | int fi_writers; |
| 96 | }; |
| 97 | |
| 98 | /* |
| 99 | * Trivial lookup routine that always fails. |
| 100 | */ |
| 101 | /* ARGSUSED */ |
| 102 | static int |
| 103 | fifo_lookup(void *v) |
| 104 | { |
| 105 | struct vop_lookup_v2_args /* { |
| 106 | struct vnode *a_dvp; |
| 107 | struct vnode **a_vpp; |
| 108 | struct componentname *a_cnp; |
| 109 | } */ *ap = v; |
| 110 | |
| 111 | *ap->a_vpp = NULL; |
| 112 | return (ENOTDIR); |
| 113 | } |
| 114 | |
| 115 | /* |
| 116 | * Open called to set up a new instance of a fifo or |
| 117 | * to find an active instance of a fifo. |
| 118 | */ |
| 119 | static int |
| 120 | fifo_open(void *v) |
| 121 | { |
| 122 | struct vop_open_args /* { |
| 123 | struct vnode *a_vp; |
| 124 | int a_mode; |
| 125 | kauth_cred_t a_cred; |
| 126 | } */ *ap = v; |
| 127 | struct lwp *l = curlwp; |
| 128 | struct vnode *vp; |
| 129 | struct fifoinfo *fip; |
| 130 | struct socket *rso, *wso; |
| 131 | int error; |
| 132 | |
| 133 | vp = ap->a_vp; |
| 134 | KASSERT(VOP_ISLOCKED(vp)); |
| 135 | |
| 136 | if ((fip = vp->v_fifoinfo) == NULL) { |
| 137 | fip = kmem_alloc(sizeof(*fip), KM_SLEEP); |
| 138 | error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, l, NULL); |
| 139 | if (error != 0) { |
| 140 | kmem_free(fip, sizeof(*fip)); |
| 141 | return (error); |
| 142 | } |
| 143 | fip->fi_readsock = rso; |
| 144 | error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, l, rso); |
| 145 | if (error != 0) { |
| 146 | (void)soclose(rso); |
| 147 | kmem_free(fip, sizeof(*fip)); |
| 148 | return (error); |
| 149 | } |
| 150 | fip->fi_writesock = wso; |
| 151 | solock(wso); |
| 152 | if ((error = unp_connect2(wso, rso)) != 0) { |
| 153 | sounlock(wso); |
| 154 | (void)soclose(wso); |
| 155 | (void)soclose(rso); |
| 156 | kmem_free(fip, sizeof(*fip)); |
| 157 | return (error); |
| 158 | } |
| 159 | fip->fi_readers = 0; |
| 160 | fip->fi_writers = 0; |
| 161 | wso->so_state |= SS_CANTRCVMORE; |
| 162 | rso->so_state |= SS_CANTSENDMORE; |
| 163 | cv_init(&fip->fi_rcv, "fiford" ); |
| 164 | cv_init(&fip->fi_wcv, "fifowr" ); |
| 165 | vp->v_fifoinfo = fip; |
| 166 | } else { |
| 167 | wso = fip->fi_writesock; |
| 168 | rso = fip->fi_readsock; |
| 169 | solock(wso); |
| 170 | } |
| 171 | |
| 172 | if (ap->a_mode & FREAD) { |
| 173 | if (fip->fi_readers++ == 0) { |
| 174 | wso->so_state &= ~SS_CANTSENDMORE; |
| 175 | cv_broadcast(&fip->fi_wcv); |
| 176 | } |
| 177 | } |
| 178 | if (ap->a_mode & FWRITE) { |
| 179 | if (fip->fi_writers++ == 0) { |
| 180 | rso->so_state &= ~SS_CANTRCVMORE; |
| 181 | cv_broadcast(&fip->fi_rcv); |
| 182 | } |
| 183 | } |
| 184 | if (ap->a_mode & FREAD) { |
| 185 | if (ap->a_mode & O_NONBLOCK) { |
| 186 | } else { |
| 187 | while (!soreadable(rso) && fip->fi_writers == 0) { |
| 188 | VOP_UNLOCK(vp); |
| 189 | error = cv_wait_sig(&fip->fi_rcv, |
| 190 | wso->so_lock); |
| 191 | sounlock(wso); |
| 192 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 193 | if (error) |
| 194 | goto bad; |
| 195 | solock(wso); |
| 196 | } |
| 197 | } |
| 198 | } |
| 199 | if (ap->a_mode & FWRITE) { |
| 200 | if (ap->a_mode & O_NONBLOCK) { |
| 201 | if (fip->fi_readers == 0) { |
| 202 | error = ENXIO; |
| 203 | sounlock(wso); |
| 204 | goto bad; |
| 205 | } |
| 206 | } else { |
| 207 | while (fip->fi_readers == 0) { |
| 208 | VOP_UNLOCK(vp); |
| 209 | error = cv_wait_sig(&fip->fi_wcv, |
| 210 | wso->so_lock); |
| 211 | sounlock(wso); |
| 212 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 213 | if (error) |
| 214 | goto bad; |
| 215 | solock(wso); |
| 216 | } |
| 217 | } |
| 218 | } |
| 219 | sounlock(wso); |
| 220 | return (0); |
| 221 | bad: |
| 222 | VOP_CLOSE(vp, ap->a_mode, ap->a_cred); |
| 223 | return (error); |
| 224 | } |
| 225 | |
| 226 | /* |
| 227 | * Vnode op for read |
| 228 | */ |
| 229 | /* ARGSUSED */ |
| 230 | static int |
| 231 | fifo_read(void *v) |
| 232 | { |
| 233 | struct vop_read_args /* { |
| 234 | struct vnode *a_vp; |
| 235 | struct uio *a_uio; |
| 236 | int a_ioflag; |
| 237 | kauth_cred_t a_cred; |
| 238 | } */ *ap = v; |
| 239 | struct uio *uio; |
| 240 | struct socket *rso; |
| 241 | int error, sflags; |
| 242 | size_t startresid; |
| 243 | |
| 244 | uio = ap->a_uio; |
| 245 | rso = ap->a_vp->v_fifoinfo->fi_readsock; |
| 246 | #ifdef DIAGNOSTIC |
| 247 | if (uio->uio_rw != UIO_READ) |
| 248 | panic("fifo_read mode" ); |
| 249 | #endif |
| 250 | if (uio->uio_resid == 0) |
| 251 | return (0); |
| 252 | startresid = uio->uio_resid; |
| 253 | VOP_UNLOCK(ap->a_vp); |
| 254 | sflags = (ap->a_ioflag & IO_NDELAY) ? MSG_NBIO : 0; |
| 255 | error = (*rso->so_receive)(rso, NULL, uio, NULL, NULL, &sflags); |
| 256 | /* |
| 257 | * Clear EOF indication after first such return. |
| 258 | */ |
| 259 | if (error == 0 && uio->uio_resid == startresid) |
| 260 | rso->so_state &= ~SS_CANTRCVMORE; |
| 261 | if (ap->a_ioflag & IO_NDELAY) { |
| 262 | if (error == EWOULDBLOCK && |
| 263 | ap->a_vp->v_fifoinfo->fi_writers == 0) |
| 264 | error = 0; |
| 265 | } |
| 266 | vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY); |
| 267 | return (error); |
| 268 | } |
| 269 | |
| 270 | /* |
| 271 | * Vnode op for write |
| 272 | */ |
| 273 | /* ARGSUSED */ |
| 274 | static int |
| 275 | fifo_write(void *v) |
| 276 | { |
| 277 | struct vop_write_args /* { |
| 278 | struct vnode *a_vp; |
| 279 | struct uio *a_uio; |
| 280 | int a_ioflag; |
| 281 | kauth_cred_t a_cred; |
| 282 | } */ *ap = v; |
| 283 | struct socket *wso; |
| 284 | int error, sflags; |
| 285 | |
| 286 | wso = ap->a_vp->v_fifoinfo->fi_writesock; |
| 287 | #ifdef DIAGNOSTIC |
| 288 | if (ap->a_uio->uio_rw != UIO_WRITE) |
| 289 | panic("fifo_write mode" ); |
| 290 | #endif |
| 291 | VOP_UNLOCK(ap->a_vp); |
| 292 | sflags = (ap->a_ioflag & IO_NDELAY) ? MSG_NBIO : 0; |
| 293 | error = (*wso->so_send)(wso, NULL, ap->a_uio, 0, NULL, sflags, curlwp); |
| 294 | vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY); |
| 295 | return (error); |
| 296 | } |
| 297 | |
| 298 | /* |
| 299 | * Device ioctl operation. |
| 300 | */ |
| 301 | /* ARGSUSED */ |
| 302 | static int |
| 303 | fifo_ioctl(void *v) |
| 304 | { |
| 305 | struct vop_ioctl_args /* { |
| 306 | struct vnode *a_vp; |
| 307 | u_long a_command; |
| 308 | void *a_data; |
| 309 | int a_fflag; |
| 310 | kauth_cred_t a_cred; |
| 311 | struct lwp *a_l; |
| 312 | } */ *ap = v; |
| 313 | struct file filetmp; |
| 314 | int error; |
| 315 | |
| 316 | if (ap->a_command == FIONBIO) |
| 317 | return (0); |
| 318 | if (ap->a_fflag & FREAD) { |
| 319 | filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock; |
| 320 | error = soo_ioctl(&filetmp, ap->a_command, ap->a_data); |
| 321 | if (error) |
| 322 | return (error); |
| 323 | } |
| 324 | if (ap->a_fflag & FWRITE) { |
| 325 | filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock; |
| 326 | error = soo_ioctl(&filetmp, ap->a_command, ap->a_data); |
| 327 | if (error) |
| 328 | return (error); |
| 329 | } |
| 330 | return (0); |
| 331 | } |
| 332 | |
| 333 | /* ARGSUSED */ |
| 334 | static int |
| 335 | fifo_poll(void *v) |
| 336 | { |
| 337 | struct vop_poll_args /* { |
| 338 | struct vnode *a_vp; |
| 339 | int a_events; |
| 340 | struct lwp *a_l; |
| 341 | } */ *ap = v; |
| 342 | struct socket *so; |
| 343 | int revents; |
| 344 | |
| 345 | revents = 0; |
| 346 | if (ap->a_events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) { |
| 347 | so = ap->a_vp->v_fifoinfo->fi_readsock; |
| 348 | if (so) |
| 349 | revents |= sopoll(so, ap->a_events); |
| 350 | } |
| 351 | if (ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND)) { |
| 352 | so = ap->a_vp->v_fifoinfo->fi_writesock; |
| 353 | if (so) |
| 354 | revents |= sopoll(so, ap->a_events); |
| 355 | } |
| 356 | |
| 357 | return (revents); |
| 358 | } |
| 359 | |
| 360 | static int |
| 361 | fifo_inactive(void *v) |
| 362 | { |
| 363 | struct vop_inactive_args /* { |
| 364 | struct vnode *a_vp; |
| 365 | struct lwp *a_l; |
| 366 | } */ *ap = v; |
| 367 | |
| 368 | VOP_UNLOCK(ap->a_vp); |
| 369 | return (0); |
| 370 | } |
| 371 | |
| 372 | /* |
| 373 | * This is a noop, simply returning what one has been given. |
| 374 | */ |
| 375 | static int |
| 376 | fifo_bmap(void *v) |
| 377 | { |
| 378 | struct vop_bmap_args /* { |
| 379 | struct vnode *a_vp; |
| 380 | daddr_t a_bn; |
| 381 | struct vnode **a_vpp; |
| 382 | daddr_t *a_bnp; |
| 383 | int *a_runp; |
| 384 | } */ *ap = v; |
| 385 | |
| 386 | if (ap->a_vpp != NULL) |
| 387 | *ap->a_vpp = ap->a_vp; |
| 388 | if (ap->a_bnp != NULL) |
| 389 | *ap->a_bnp = ap->a_bn; |
| 390 | if (ap->a_runp != NULL) |
| 391 | *ap->a_runp = 0; |
| 392 | return (0); |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * Device close routine |
| 397 | */ |
| 398 | /* ARGSUSED */ |
| 399 | static int |
| 400 | fifo_close(void *v) |
| 401 | { |
| 402 | struct vop_close_args /* { |
| 403 | struct vnode *a_vp; |
| 404 | int a_fflag; |
| 405 | kauth_cred_t a_cred; |
| 406 | struct lwp *a_l; |
| 407 | } */ *ap = v; |
| 408 | struct vnode *vp; |
| 409 | struct fifoinfo *fip; |
| 410 | struct socket *wso, *rso; |
| 411 | int isrevoke; |
| 412 | |
| 413 | vp = ap->a_vp; |
| 414 | fip = vp->v_fifoinfo; |
| 415 | isrevoke = (ap->a_fflag & (FREAD | FWRITE | FNONBLOCK)) == FNONBLOCK; |
| 416 | wso = fip->fi_writesock; |
| 417 | rso = fip->fi_readsock; |
| 418 | solock(wso); |
| 419 | if (isrevoke) { |
| 420 | if (fip->fi_readers != 0) { |
| 421 | fip->fi_readers = 0; |
| 422 | socantsendmore(wso); |
| 423 | } |
| 424 | if (fip->fi_writers != 0) { |
| 425 | fip->fi_writers = 0; |
| 426 | socantrcvmore(rso); |
| 427 | } |
| 428 | } else { |
| 429 | if ((ap->a_fflag & FREAD) && --fip->fi_readers == 0) |
| 430 | socantsendmore(wso); |
| 431 | if ((ap->a_fflag & FWRITE) && --fip->fi_writers == 0) |
| 432 | socantrcvmore(rso); |
| 433 | } |
| 434 | if ((fip->fi_readers + fip->fi_writers) == 0) { |
| 435 | sounlock(wso); |
| 436 | (void) soclose(rso); |
| 437 | (void) soclose(wso); |
| 438 | cv_destroy(&fip->fi_rcv); |
| 439 | cv_destroy(&fip->fi_wcv); |
| 440 | kmem_free(fip, sizeof(*fip)); |
| 441 | vp->v_fifoinfo = NULL; |
| 442 | } else |
| 443 | sounlock(wso); |
| 444 | return (0); |
| 445 | } |
| 446 | |
| 447 | /* |
| 448 | * Print out internal contents of a fifo vnode. |
| 449 | */ |
| 450 | static void |
| 451 | fifo_printinfo(struct vnode *vp) |
| 452 | { |
| 453 | struct fifoinfo *fip; |
| 454 | |
| 455 | fip = vp->v_fifoinfo; |
| 456 | printf(", fifo with %d readers and %d writers" , |
| 457 | fip->fi_readers, fip->fi_writers); |
| 458 | } |
| 459 | |
| 460 | /* |
| 461 | * Print out the contents of a fifo vnode. |
| 462 | */ |
| 463 | static int |
| 464 | fifo_print(void *v) |
| 465 | { |
| 466 | struct vop_print_args /* { |
| 467 | struct vnode *a_vp; |
| 468 | } */ *ap = v; |
| 469 | |
| 470 | /* |
| 471 | * We are most likely being called with the vnode belonging |
| 472 | * to some file system and this is not printed. |
| 473 | */ |
| 474 | if (ap->a_vp->v_tag == VT_NON) |
| 475 | printf("tag VT_NON" ); |
| 476 | |
| 477 | fifo_printinfo(ap->a_vp); |
| 478 | printf("\n" ); |
| 479 | return 0; |
| 480 | } |
| 481 | |
| 482 | /* |
| 483 | * Return POSIX pathconf information applicable to fifo's. |
| 484 | */ |
| 485 | static int |
| 486 | fifo_pathconf(void *v) |
| 487 | { |
| 488 | struct vop_pathconf_args /* { |
| 489 | struct vnode *a_vp; |
| 490 | int a_name; |
| 491 | register_t *a_retval; |
| 492 | } */ *ap = v; |
| 493 | |
| 494 | switch (ap->a_name) { |
| 495 | case _PC_LINK_MAX: |
| 496 | *ap->a_retval = LINK_MAX; |
| 497 | return (0); |
| 498 | case _PC_PIPE_BUF: |
| 499 | *ap->a_retval = PIPE_BUF; |
| 500 | return (0); |
| 501 | case _PC_CHOWN_RESTRICTED: |
| 502 | *ap->a_retval = 1; |
| 503 | return (0); |
| 504 | case _PC_SYNC_IO: |
| 505 | *ap->a_retval = 1; |
| 506 | return (0); |
| 507 | default: |
| 508 | return (EINVAL); |
| 509 | } |
| 510 | /* NOTREACHED */ |
| 511 | } |
| 512 | |
| 513 | static void |
| 514 | filt_fifordetach(struct knote *kn) |
| 515 | { |
| 516 | struct socket *so; |
| 517 | |
| 518 | so = (struct socket *)kn->kn_hook; |
| 519 | solock(so); |
| 520 | SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext); |
| 521 | if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist)) |
| 522 | so->so_rcv.sb_flags &= ~SB_KNOTE; |
| 523 | sounlock(so); |
| 524 | } |
| 525 | |
| 526 | static int |
| 527 | filt_fiforead(struct knote *kn, long hint) |
| 528 | { |
| 529 | struct socket *so; |
| 530 | int rv; |
| 531 | |
| 532 | so = (struct socket *)kn->kn_hook; |
| 533 | if (hint != NOTE_SUBMIT) |
| 534 | solock(so); |
| 535 | kn->kn_data = so->so_rcv.sb_cc; |
| 536 | if (so->so_state & SS_CANTRCVMORE) { |
| 537 | kn->kn_flags |= EV_EOF; |
| 538 | rv = 1; |
| 539 | } else { |
| 540 | kn->kn_flags &= ~EV_EOF; |
| 541 | rv = (kn->kn_data > 0); |
| 542 | } |
| 543 | if (hint != NOTE_SUBMIT) |
| 544 | sounlock(so); |
| 545 | return rv; |
| 546 | } |
| 547 | |
| 548 | static void |
| 549 | filt_fifowdetach(struct knote *kn) |
| 550 | { |
| 551 | struct socket *so; |
| 552 | |
| 553 | so = (struct socket *)kn->kn_hook; |
| 554 | solock(so); |
| 555 | SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext); |
| 556 | if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist)) |
| 557 | so->so_snd.sb_flags &= ~SB_KNOTE; |
| 558 | sounlock(so); |
| 559 | } |
| 560 | |
| 561 | static int |
| 562 | filt_fifowrite(struct knote *kn, long hint) |
| 563 | { |
| 564 | struct socket *so; |
| 565 | int rv; |
| 566 | |
| 567 | so = (struct socket *)kn->kn_hook; |
| 568 | if (hint != NOTE_SUBMIT) |
| 569 | solock(so); |
| 570 | kn->kn_data = sbspace(&so->so_snd); |
| 571 | if (so->so_state & SS_CANTSENDMORE) { |
| 572 | kn->kn_flags |= EV_EOF; |
| 573 | rv = 1; |
| 574 | } else { |
| 575 | kn->kn_flags &= ~EV_EOF; |
| 576 | rv = (kn->kn_data >= so->so_snd.sb_lowat); |
| 577 | } |
| 578 | if (hint != NOTE_SUBMIT) |
| 579 | sounlock(so); |
| 580 | return rv; |
| 581 | } |
| 582 | |
| 583 | static const struct filterops fiforead_filtops = |
| 584 | { 1, NULL, filt_fifordetach, filt_fiforead }; |
| 585 | static const struct filterops fifowrite_filtops = |
| 586 | { 1, NULL, filt_fifowdetach, filt_fifowrite }; |
| 587 | |
| 588 | /* ARGSUSED */ |
| 589 | static int |
| 590 | fifo_kqfilter(void *v) |
| 591 | { |
| 592 | struct vop_kqfilter_args /* { |
| 593 | struct vnode *a_vp; |
| 594 | struct knote *a_kn; |
| 595 | } */ *ap = v; |
| 596 | struct socket *so; |
| 597 | struct sockbuf *sb; |
| 598 | |
| 599 | so = (struct socket *)ap->a_vp->v_fifoinfo->fi_readsock; |
| 600 | switch (ap->a_kn->kn_filter) { |
| 601 | case EVFILT_READ: |
| 602 | ap->a_kn->kn_fop = &fiforead_filtops; |
| 603 | sb = &so->so_rcv; |
| 604 | break; |
| 605 | case EVFILT_WRITE: |
| 606 | ap->a_kn->kn_fop = &fifowrite_filtops; |
| 607 | sb = &so->so_snd; |
| 608 | break; |
| 609 | default: |
| 610 | return (EINVAL); |
| 611 | } |
| 612 | |
| 613 | ap->a_kn->kn_hook = so; |
| 614 | |
| 615 | solock(so); |
| 616 | SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, ap->a_kn, kn_selnext); |
| 617 | sb->sb_flags |= SB_KNOTE; |
| 618 | sounlock(so); |
| 619 | |
| 620 | return (0); |
| 621 | } |
| 622 | |
| 623 | int (**fifo_vnodeop_p)(void *); |
| 624 | const struct vnodeopv_entry_desc fifo_vnodeop_entries[] = { |
| 625 | { &vop_default_desc, vn_default_error }, |
| 626 | { &vop_lookup_desc, fifo_lookup }, /* lookup */ |
| 627 | { &vop_create_desc, genfs_badop }, /* create */ |
| 628 | { &vop_mknod_desc, genfs_badop }, /* mknod */ |
| 629 | { &vop_open_desc, fifo_open }, /* open */ |
| 630 | { &vop_close_desc, fifo_close }, /* close */ |
| 631 | { &vop_access_desc, genfs_ebadf }, /* access */ |
| 632 | { &vop_getattr_desc, genfs_ebadf }, /* getattr */ |
| 633 | { &vop_setattr_desc, genfs_ebadf }, /* setattr */ |
| 634 | { &vop_read_desc, fifo_read }, /* read */ |
| 635 | { &vop_write_desc, fifo_write }, /* write */ |
| 636 | { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ |
| 637 | { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ |
| 638 | { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ |
| 639 | { &vop_poll_desc, fifo_poll }, /* poll */ |
| 640 | { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */ |
| 641 | { &vop_revoke_desc, genfs_revoke }, /* revoke */ |
| 642 | { &vop_mmap_desc, genfs_badop }, /* mmap */ |
| 643 | { &vop_fsync_desc, genfs_nullop }, /* fsync */ |
| 644 | { &vop_seek_desc, genfs_badop }, /* seek */ |
| 645 | { &vop_remove_desc, genfs_badop }, /* remove */ |
| 646 | { &vop_link_desc, genfs_badop }, /* link */ |
| 647 | { &vop_rename_desc, genfs_badop }, /* rename */ |
| 648 | { &vop_mkdir_desc, genfs_badop }, /* mkdir */ |
| 649 | { &vop_rmdir_desc, genfs_badop }, /* rmdir */ |
| 650 | { &vop_symlink_desc, genfs_badop }, /* symlink */ |
| 651 | { &vop_readdir_desc, genfs_badop }, /* readdir */ |
| 652 | { &vop_readlink_desc, genfs_badop }, /* readlink */ |
| 653 | { &vop_abortop_desc, genfs_badop }, /* abortop */ |
| 654 | { &vop_inactive_desc, fifo_inactive }, /* inactive */ |
| 655 | { &vop_reclaim_desc, genfs_nullop }, /* reclaim */ |
| 656 | { &vop_lock_desc, genfs_lock }, /* lock */ |
| 657 | { &vop_unlock_desc, genfs_unlock }, /* unlock */ |
| 658 | { &vop_bmap_desc, fifo_bmap }, /* bmap */ |
| 659 | { &vop_strategy_desc, genfs_badop }, /* strategy */ |
| 660 | { &vop_print_desc, fifo_print }, /* print */ |
| 661 | { &vop_islocked_desc, genfs_islocked }, /* islocked */ |
| 662 | { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ |
| 663 | { &vop_advlock_desc, genfs_einval }, /* advlock */ |
| 664 | { &vop_bwrite_desc, genfs_nullop }, /* bwrite */ |
| 665 | { &vop_putpages_desc, genfs_null_putpages }, /* putpages */ |
| 666 | { NULL, NULL } |
| 667 | }; |
| 668 | const struct vnodeopv_desc fifo_vnodeop_opv_desc = |
| 669 | { &fifo_vnodeop_p, fifo_vnodeop_entries }; |
| 670 | |