fdesc_vnops.c revision 1.22
1 /* $NetBSD: fdesc_vnops.c,v 1.22 1994/12/13 09:58:14 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)fdesc_vnops.c 8.12 (Berkeley) 8/20/94 39 * 40 * #Id: fdesc_vnops.c,v 1.12 1993/04/06 16:17:17 jsp Exp # 41 */ 42 43 /* 44 * /dev/fd Filesystem 45 */ 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/types.h> 50 #include <sys/time.h> 51 #include <sys/proc.h> 52 #include <sys/kernel.h> /* boottime */ 53 #include <sys/resourcevar.h> 54 #include <sys/filedesc.h> 55 #include <sys/vnode.h> 56 #include <sys/malloc.h> 57 #include <sys/file.h> 58 #include <sys/stat.h> 59 #include <sys/mount.h> 60 #include <sys/namei.h> 61 #include <sys/buf.h> 62 #include <sys/dirent.h> 63 #include <miscfs/fdesc/fdesc.h> 64 65 #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL) 66 67 #define FDL_WANT 0x01 68 #define FDL_LOCKED 0x02 69 static int fdcache_lock; 70 71 dev_t devctty; 72 73 #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1) 74 FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2 75 #endif 76 77 #define NFDCACHE 4 78 79 #define FD_NHASH(ix) \ 80 (&fdhashtbl[(ix) & fdhash]) 81 LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl; 82 u_long fdhash; 83 84 /* 85 * Initialise cache headers 86 */ 87 fdesc_init() 88 { 89 90 devctty = makedev(nchrdev, 0); 91 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash); 92 } 93 94 int 95 fdesc_allocvp(ftype, ix, mp, vpp) 96 fdntype ftype; 97 int ix; 98 struct mount *mp; 99 struct vnode **vpp; 100 { 101 struct fdhashhead *fc; 102 struct fdescnode *fd; 103 int error = 0; 104 105 fc = FD_NHASH(ix); 106 loop: 107 for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) { 108 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) { 109 if (vget(fd->fd_vnode, 0)) 110 goto loop; 111 *vpp = fd->fd_vnode; 112 return (error); 113 } 114 } 115 116 /* 117 * otherwise lock the array while we call getnewvnode 118 * since that can block. 119 */ 120 if (fdcache_lock & FDL_LOCKED) { 121 fdcache_lock |= FDL_WANT; 122 sleep((caddr_t) &fdcache_lock, PINOD); 123 goto loop; 124 } 125 fdcache_lock |= FDL_LOCKED; 126 127 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp); 128 if (error) 129 goto out; 130 MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK); 131 (*vpp)->v_data = fd; 132 fd->fd_vnode = *vpp; 133 fd->fd_type = ftype; 134 fd->fd_fd = -1; 135 fd->fd_link = 0; 136 fd->fd_ix = ix; 137 LIST_INSERT_HEAD(fc, fd, fd_hash); 138 139 out:; 140 fdcache_lock &= ~FDL_LOCKED; 141 142 if (fdcache_lock & FDL_WANT) { 143 fdcache_lock &= ~FDL_WANT; 144 wakeup((caddr_t) &fdcache_lock); 145 } 146 147 return (error); 148 } 149 150 /* 151 * vp is the current namei directory 152 * ndp is the name to locate in that directory... 153 */ 154 int 155 fdesc_lookup(ap) 156 struct vop_lookup_args /* { 157 struct vnode * a_dvp; 158 struct vnode ** a_vpp; 159 struct componentname * a_cnp; 160 } */ *ap; 161 { 162 struct vnode **vpp = ap->a_vpp; 163 struct vnode *dvp = ap->a_dvp; 164 char *pname; 165 struct proc *p; 166 int nfiles; 167 unsigned fd; 168 int error; 169 struct vnode *fvp; 170 char *ln; 171 172 pname = ap->a_cnp->cn_nameptr; 173 if (ap->a_cnp->cn_namelen == 1 && *pname == '.') { 174 *vpp = dvp; 175 VREF(dvp); 176 VOP_LOCK(dvp); 177 return (0); 178 } 179 180 p = ap->a_cnp->cn_proc; 181 nfiles = p->p_fd->fd_nfiles; 182 183 switch (VTOFDESC(dvp)->fd_type) { 184 default: 185 case Flink: 186 case Fdesc: 187 case Fctty: 188 error = ENOTDIR; 189 goto bad; 190 191 case Froot: 192 if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "fd", 2) == 0) { 193 error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp); 194 if (error) 195 goto bad; 196 *vpp = fvp; 197 fvp->v_type = VDIR; 198 VOP_LOCK(fvp); 199 return (0); 200 } 201 202 if (ap->a_cnp->cn_namelen == 3 && bcmp(pname, "tty", 3) == 0) { 203 struct vnode *ttyvp = cttyvp(p); 204 if (ttyvp == NULL) { 205 error = ENXIO; 206 goto bad; 207 } 208 error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp); 209 if (error) 210 goto bad; 211 *vpp = fvp; 212 fvp->v_type = VFIFO; 213 VOP_LOCK(fvp); 214 return (0); 215 } 216 217 ln = 0; 218 switch (ap->a_cnp->cn_namelen) { 219 case 5: 220 if (bcmp(pname, "stdin", 5) == 0) { 221 ln = "fd/0"; 222 fd = FD_STDIN; 223 } 224 break; 225 case 6: 226 if (bcmp(pname, "stdout", 6) == 0) { 227 ln = "fd/1"; 228 fd = FD_STDOUT; 229 } else 230 if (bcmp(pname, "stderr", 6) == 0) { 231 ln = "fd/2"; 232 fd = FD_STDERR; 233 } 234 break; 235 } 236 237 if (ln) { 238 error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp); 239 if (error) 240 goto bad; 241 VTOFDESC(fvp)->fd_link = ln; 242 *vpp = fvp; 243 fvp->v_type = VLNK; 244 VOP_LOCK(fvp); 245 return (0); 246 } else { 247 error = ENOENT; 248 goto bad; 249 } 250 251 /* FALL THROUGH */ 252 253 case Fdevfd: 254 if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "..", 2) == 0) { 255 error = fdesc_root(dvp->v_mount, vpp); 256 return (error); 257 } 258 259 fd = 0; 260 while (*pname >= '0' && *pname <= '9') { 261 fd = 10 * fd + *pname++ - '0'; 262 if (fd >= nfiles) 263 break; 264 } 265 266 if (*pname != '\0') { 267 error = ENOENT; 268 goto bad; 269 } 270 271 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) { 272 error = EBADF; 273 goto bad; 274 } 275 276 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp); 277 if (error) 278 goto bad; 279 VTOFDESC(fvp)->fd_fd = fd; 280 *vpp = fvp; 281 return (0); 282 } 283 284 bad:; 285 *vpp = NULL; 286 return (error); 287 } 288 289 int 290 fdesc_open(ap) 291 struct vop_open_args /* { 292 struct vnode *a_vp; 293 int a_mode; 294 struct ucred *a_cred; 295 struct proc *a_p; 296 struct file *a_fp; 297 } */ *ap; 298 { 299 struct vnode *vp = ap->a_vp; 300 301 switch (VTOFDESC(vp)->fd_type) { 302 case Fdesc: 303 /* Do the same thing as fdopen(). */ 304 return (fddupopen(VTOFDESC(vp)->fd_fd, ap->a_mode, ap->a_p, ap->a_fp)); 305 306 case Fctty: 307 return (cttyopen(devctty, ap->a_mode, 0, ap->a_p)); 308 } 309 310 return (0); 311 } 312 313 static int 314 fdesc_attr(fd, vap, cred, p) 315 int fd; 316 struct vattr *vap; 317 struct ucred *cred; 318 struct proc *p; 319 { 320 struct filedesc *fdp = p->p_fd; 321 struct file *fp; 322 struct stat stb; 323 int error; 324 325 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) 326 return (EBADF); 327 328 switch (fp->f_type) { 329 case DTYPE_VNODE: 330 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, p); 331 if (error == 0 && vap->va_type == VDIR) { 332 /* 333 * directories can cause loops in the namespace, 334 * so turn off the 'x' bits to avoid trouble. 335 */ 336 vap->va_mode &= ~((VEXEC)|(VEXEC>>3)|(VEXEC>>6)); 337 } 338 break; 339 340 case DTYPE_SOCKET: 341 error = soo_stat((struct socket *)fp->f_data, &stb); 342 if (error == 0) { 343 vattr_null(vap); 344 vap->va_type = VSOCK; 345 vap->va_mode = stb.st_mode; 346 vap->va_nlink = stb.st_nlink; 347 vap->va_uid = stb.st_uid; 348 vap->va_gid = stb.st_gid; 349 vap->va_fsid = stb.st_dev; 350 vap->va_fileid = stb.st_ino; 351 vap->va_size = stb.st_size; 352 vap->va_blocksize = stb.st_blksize; 353 vap->va_atime = stb.st_atimespec; 354 vap->va_mtime = stb.st_mtimespec; 355 vap->va_ctime = stb.st_ctimespec; 356 vap->va_gen = stb.st_gen; 357 vap->va_flags = stb.st_flags; 358 vap->va_rdev = stb.st_rdev; 359 vap->va_bytes = stb.st_blocks * stb.st_blksize; 360 } 361 break; 362 363 default: 364 panic("fdesc attr"); 365 break; 366 } 367 368 return (error); 369 } 370 371 int 372 fdesc_getattr(ap) 373 struct vop_getattr_args /* { 374 struct vnode *a_vp; 375 struct vattr *a_vap; 376 struct ucred *a_cred; 377 struct proc *a_p; 378 } */ *ap; 379 { 380 struct vnode *vp = ap->a_vp; 381 struct vattr *vap = ap->a_vap; 382 unsigned fd; 383 int error = 0; 384 385 switch (VTOFDESC(vp)->fd_type) { 386 case Froot: 387 case Fdevfd: 388 case Flink: 389 case Fctty: 390 bzero((caddr_t) vap, sizeof(*vap)); 391 vattr_null(vap); 392 vap->va_fileid = VTOFDESC(vp)->fd_ix; 393 394 switch (VTOFDESC(vp)->fd_type) { 395 case Flink: 396 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 397 vap->va_type = VLNK; 398 vap->va_nlink = 1; 399 vap->va_size = strlen(VTOFDESC(vp)->fd_link); 400 break; 401 402 case Fctty: 403 vap->va_mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH; 404 vap->va_type = VFIFO; 405 vap->va_nlink = 1; 406 vap->va_size = 0; 407 break; 408 409 default: 410 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 411 vap->va_type = VDIR; 412 vap->va_nlink = 2; 413 vap->va_size = DEV_BSIZE; 414 break; 415 } 416 vap->va_uid = 0; 417 vap->va_gid = 0; 418 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 419 vap->va_blocksize = DEV_BSIZE; 420 vap->va_atime.ts_sec = boottime.tv_sec; 421 vap->va_atime.ts_nsec = 0; 422 vap->va_mtime = vap->va_atime; 423 vap->va_ctime = vap->va_mtime; 424 vap->va_gen = 0; 425 vap->va_flags = 0; 426 vap->va_rdev = 0; 427 vap->va_bytes = 0; 428 break; 429 430 case Fdesc: 431 fd = VTOFDESC(vp)->fd_fd; 432 error = fdesc_attr(fd, vap, ap->a_cred, ap->a_p); 433 break; 434 435 default: 436 panic("fdesc_getattr"); 437 break; 438 } 439 440 if (error == 0) 441 vp->v_type = vap->va_type; 442 443 return (error); 444 } 445 446 int 447 fdesc_setattr(ap) 448 struct vop_setattr_args /* { 449 struct vnode *a_vp; 450 struct vattr *a_vap; 451 struct ucred *a_cred; 452 struct proc *a_p; 453 } */ *ap; 454 { 455 struct filedesc *fdp = ap->a_p->p_fd; 456 struct file *fp; 457 unsigned fd; 458 int error; 459 460 /* 461 * Can't mess with the root vnode 462 */ 463 switch (VTOFDESC(ap->a_vp)->fd_type) { 464 case Fdesc: 465 break; 466 467 case Fctty: 468 return (0); 469 470 default: 471 return (EACCES); 472 } 473 474 fd = VTOFDESC(ap->a_vp)->fd_fd; 475 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) { 476 return (EBADF); 477 } 478 479 /* 480 * Can setattr the underlying vnode, but not sockets! 481 */ 482 switch (fp->f_type) { 483 case DTYPE_VNODE: 484 error = VOP_SETATTR((struct vnode *) fp->f_data, ap->a_vap, ap->a_cred, ap->a_p); 485 break; 486 487 case DTYPE_SOCKET: 488 error = 0; 489 break; 490 491 default: 492 panic("fdesc setattr"); 493 break; 494 } 495 496 return (error); 497 } 498 499 #define UIO_MX 16 500 501 static struct dirtmp { 502 u_long d_fileno; 503 u_short d_reclen; 504 u_short d_namlen; 505 char d_name[8]; 506 } rootent[] = { 507 { FD_DEVFD, UIO_MX, 2, "fd" }, 508 { FD_STDIN, UIO_MX, 5, "stdin" }, 509 { FD_STDOUT, UIO_MX, 6, "stdout" }, 510 { FD_STDERR, UIO_MX, 6, "stderr" }, 511 { FD_CTTY, UIO_MX, 3, "tty" }, 512 { 0 } 513 }; 514 515 int 516 fdesc_readdir(ap) 517 struct vop_readdir_args /* { 518 struct vnode *a_vp; 519 struct uio *a_uio; 520 struct ucred *a_cred; 521 int *a_eofflag; 522 u_long *a_cookies; 523 int a_ncookies; 524 } */ *ap; 525 { 526 struct uio *uio = ap->a_uio; 527 struct filedesc *fdp; 528 int i; 529 int error; 530 531 /* 532 * We don't allow exporting fdesc mounts, and currently local 533 * requests do not need cookies. 534 */ 535 if (ap->a_ncookies) 536 panic("fdesc_readdir: not hungry"); 537 538 switch (VTOFDESC(ap->a_vp)->fd_type) { 539 case Fctty: 540 return (0); 541 542 case Fdesc: 543 return (ENOTDIR); 544 545 default: 546 break; 547 } 548 549 fdp = uio->uio_procp->p_fd; 550 551 if (VTOFDESC(ap->a_vp)->fd_type == Froot) { 552 struct dirent d; 553 struct dirent *dp = &d; 554 struct dirtmp *dt; 555 556 i = uio->uio_offset / UIO_MX; 557 error = 0; 558 559 while (uio->uio_resid > 0) { 560 dt = &rootent[i]; 561 if (dt->d_fileno == 0) { 562 /**eofflagp = 1;*/ 563 break; 564 } 565 i++; 566 567 switch (dt->d_fileno) { 568 case FD_CTTY: 569 if (cttyvp(uio->uio_procp) == NULL) 570 continue; 571 break; 572 573 case FD_STDIN: 574 case FD_STDOUT: 575 case FD_STDERR: 576 if ((dt->d_fileno-FD_STDIN) >= fdp->fd_nfiles) 577 continue; 578 if (fdp->fd_ofiles[dt->d_fileno-FD_STDIN] == NULL) 579 continue; 580 break; 581 } 582 bzero((caddr_t) dp, UIO_MX); 583 dp->d_fileno = dt->d_fileno; 584 dp->d_namlen = dt->d_namlen; 585 dp->d_type = DT_UNKNOWN; 586 dp->d_reclen = dt->d_reclen; 587 bcopy(dt->d_name, dp->d_name, dp->d_namlen+1); 588 error = uiomove((caddr_t) dp, UIO_MX, uio); 589 if (error) 590 break; 591 } 592 uio->uio_offset = i * UIO_MX; 593 return (error); 594 } 595 596 i = uio->uio_offset / UIO_MX; 597 error = 0; 598 while (uio->uio_resid > 0) { 599 if (i >= fdp->fd_nfiles) 600 break; 601 602 if (fdp->fd_ofiles[i] != NULL) { 603 struct dirent d; 604 struct dirent *dp = &d; 605 606 bzero((caddr_t) dp, UIO_MX); 607 608 dp->d_namlen = sprintf(dp->d_name, "%d", i); 609 dp->d_reclen = UIO_MX; 610 dp->d_type = DT_UNKNOWN; 611 dp->d_fileno = i + FD_STDIN; 612 /* 613 * And ship to userland 614 */ 615 error = uiomove((caddr_t) dp, UIO_MX, uio); 616 if (error) 617 break; 618 } 619 i++; 620 } 621 622 uio->uio_offset = i * UIO_MX; 623 return (error); 624 } 625 626 int 627 fdesc_readlink(ap) 628 struct vop_readlink_args /* { 629 struct vnode *a_vp; 630 struct uio *a_uio; 631 struct ucred *a_cred; 632 } */ *ap; 633 { 634 struct vnode *vp = ap->a_vp; 635 int error; 636 637 if (vp->v_type != VLNK) 638 return (EPERM); 639 640 if (VTOFDESC(vp)->fd_type == Flink) { 641 char *ln = VTOFDESC(vp)->fd_link; 642 error = uiomove(ln, strlen(ln), ap->a_uio); 643 } else { 644 error = EOPNOTSUPP; 645 } 646 647 return (error); 648 } 649 650 int 651 fdesc_read(ap) 652 struct vop_read_args /* { 653 struct vnode *a_vp; 654 struct uio *a_uio; 655 int a_ioflag; 656 struct ucred *a_cred; 657 } */ *ap; 658 { 659 int error = EOPNOTSUPP; 660 661 switch (VTOFDESC(ap->a_vp)->fd_type) { 662 case Fctty: 663 error = cttyread(devctty, ap->a_uio, ap->a_ioflag); 664 break; 665 666 default: 667 error = EOPNOTSUPP; 668 break; 669 } 670 671 return (error); 672 } 673 674 int 675 fdesc_write(ap) 676 struct vop_write_args /* { 677 struct vnode *a_vp; 678 struct uio *a_uio; 679 int a_ioflag; 680 struct ucred *a_cred; 681 } */ *ap; 682 { 683 int error = EOPNOTSUPP; 684 685 switch (VTOFDESC(ap->a_vp)->fd_type) { 686 case Fctty: 687 error = cttywrite(devctty, ap->a_uio, ap->a_ioflag); 688 break; 689 690 default: 691 error = EOPNOTSUPP; 692 break; 693 } 694 695 return (error); 696 } 697 698 int 699 fdesc_ioctl(ap) 700 struct vop_ioctl_args /* { 701 struct vnode *a_vp; 702 u_long a_command; 703 caddr_t a_data; 704 int a_fflag; 705 struct ucred *a_cred; 706 struct proc *a_p; 707 } */ *ap; 708 { 709 int error = EOPNOTSUPP; 710 711 switch (VTOFDESC(ap->a_vp)->fd_type) { 712 case Fctty: 713 error = cttyioctl(devctty, ap->a_command, ap->a_data, 714 ap->a_fflag, ap->a_p); 715 break; 716 717 default: 718 error = EOPNOTSUPP; 719 break; 720 } 721 722 return (error); 723 } 724 725 int 726 fdesc_select(ap) 727 struct vop_select_args /* { 728 struct vnode *a_vp; 729 int a_which; 730 int a_fflags; 731 struct ucred *a_cred; 732 struct proc *a_p; 733 } */ *ap; 734 { 735 int error = EOPNOTSUPP; 736 737 switch (VTOFDESC(ap->a_vp)->fd_type) { 738 case Fctty: 739 error = cttyselect(devctty, ap->a_fflags, ap->a_p); 740 break; 741 742 default: 743 error = EOPNOTSUPP; 744 break; 745 } 746 747 return (error); 748 } 749 750 int 751 fdesc_inactive(ap) 752 struct vop_inactive_args /* { 753 struct vnode *a_vp; 754 } */ *ap; 755 { 756 struct vnode *vp = ap->a_vp; 757 758 /* 759 * Clear out the v_type field to avoid 760 * nasty things happening in vgone(). 761 */ 762 vp->v_type = VNON; 763 return (0); 764 } 765 766 int 767 fdesc_reclaim(ap) 768 struct vop_reclaim_args /* { 769 struct vnode *a_vp; 770 } */ *ap; 771 { 772 struct vnode *vp = ap->a_vp; 773 struct fdescnode *fd = VTOFDESC(vp); 774 775 LIST_REMOVE(fd, fd_hash); 776 FREE(vp->v_data, M_TEMP); 777 vp->v_data = 0; 778 779 return (0); 780 } 781 782 /* 783 * Return POSIX pathconf information applicable to special devices. 784 */ 785 fdesc_pathconf(ap) 786 struct vop_pathconf_args /* { 787 struct vnode *a_vp; 788 int a_name; 789 register_t *a_retval; 790 } */ *ap; 791 { 792 793 switch (ap->a_name) { 794 case _PC_LINK_MAX: 795 *ap->a_retval = LINK_MAX; 796 return (0); 797 case _PC_MAX_CANON: 798 *ap->a_retval = MAX_CANON; 799 return (0); 800 case _PC_MAX_INPUT: 801 *ap->a_retval = MAX_INPUT; 802 return (0); 803 case _PC_PIPE_BUF: 804 *ap->a_retval = PIPE_BUF; 805 return (0); 806 case _PC_CHOWN_RESTRICTED: 807 *ap->a_retval = 1; 808 return (0); 809 case _PC_VDISABLE: 810 *ap->a_retval = _POSIX_VDISABLE; 811 return (0); 812 default: 813 return (EINVAL); 814 } 815 /* NOTREACHED */ 816 } 817 818 /* 819 * Print out the contents of a /dev/fd vnode. 820 */ 821 /* ARGSUSED */ 822 int 823 fdesc_print(ap) 824 struct vop_print_args /* { 825 struct vnode *a_vp; 826 } */ *ap; 827 { 828 829 printf("tag VT_NON, fdesc vnode\n"); 830 return (0); 831 } 832 833 /*void*/ 834 int 835 fdesc_vfree(ap) 836 struct vop_vfree_args /* { 837 struct vnode *a_pvp; 838 ino_t a_ino; 839 int a_mode; 840 } */ *ap; 841 { 842 843 return (0); 844 } 845 846 /* 847 * /dev/fd vnode unsupported operation 848 */ 849 int 850 fdesc_enotsupp() 851 { 852 853 return (EOPNOTSUPP); 854 } 855 856 /* 857 * /dev/fd "should never get here" operation 858 */ 859 int 860 fdesc_badop() 861 { 862 863 panic("fdesc: bad op"); 864 /* NOTREACHED */ 865 } 866 867 /* 868 * /dev/fd vnode null operation 869 */ 870 int 871 fdesc_nullop() 872 { 873 874 return (0); 875 } 876 877 #define fdesc_create ((int (*) __P((struct vop_create_args *)))fdesc_enotsupp) 878 #define fdesc_mknod ((int (*) __P((struct vop_mknod_args *)))fdesc_enotsupp) 879 #define fdesc_close ((int (*) __P((struct vop_close_args *)))nullop) 880 #define fdesc_access ((int (*) __P((struct vop_access_args *)))nullop) 881 #define fdesc_mmap ((int (*) __P((struct vop_mmap_args *)))fdesc_enotsupp) 882 #define fdesc_fsync ((int (*) __P((struct vop_fsync_args *)))nullop) 883 #define fdesc_seek ((int (*) __P((struct vop_seek_args *)))nullop) 884 #define fdesc_remove ((int (*) __P((struct vop_remove_args *)))fdesc_enotsupp) 885 #define fdesc_link ((int (*) __P((struct vop_link_args *)))fdesc_enotsupp) 886 #define fdesc_rename ((int (*) __P((struct vop_rename_args *)))fdesc_enotsupp) 887 #define fdesc_mkdir ((int (*) __P((struct vop_mkdir_args *)))fdesc_enotsupp) 888 #define fdesc_rmdir ((int (*) __P((struct vop_rmdir_args *)))fdesc_enotsupp) 889 #define fdesc_symlink ((int (*) __P((struct vop_symlink_args *)))fdesc_enotsupp) 890 #define fdesc_abortop ((int (*) __P((struct vop_abortop_args *)))nullop) 891 #define fdesc_lock ((int (*) __P((struct vop_lock_args *)))nullop) 892 #define fdesc_unlock ((int (*) __P((struct vop_unlock_args *)))nullop) 893 #define fdesc_bmap ((int (*) __P((struct vop_bmap_args *)))fdesc_badop) 894 #define fdesc_strategy ((int (*) __P((struct vop_strategy_args *)))fdesc_badop) 895 #define fdesc_islocked ((int (*) __P((struct vop_islocked_args *)))nullop) 896 #define fdesc_advlock ((int (*) __P((struct vop_advlock_args *)))fdesc_enotsupp) 897 #define fdesc_blkatoff \ 898 ((int (*) __P((struct vop_blkatoff_args *)))fdesc_enotsupp) 899 #define fdesc_vget ((int (*) __P((struct vop_vget_args *)))fdesc_enotsupp) 900 #define fdesc_valloc ((int(*) __P(( \ 901 struct vnode *pvp, \ 902 int mode, \ 903 struct ucred *cred, \ 904 struct vnode **vpp))) fdesc_enotsupp) 905 #define fdesc_truncate \ 906 ((int (*) __P((struct vop_truncate_args *)))fdesc_enotsupp) 907 #define fdesc_update ((int (*) __P((struct vop_update_args *)))fdesc_enotsupp) 908 #define fdesc_bwrite ((int (*) __P((struct vop_bwrite_args *)))fdesc_enotsupp) 909 910 int (**fdesc_vnodeop_p)(); 911 struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = { 912 { &vop_default_desc, vn_default_error }, 913 { &vop_lookup_desc, fdesc_lookup }, /* lookup */ 914 { &vop_create_desc, fdesc_create }, /* create */ 915 { &vop_mknod_desc, fdesc_mknod }, /* mknod */ 916 { &vop_open_desc, fdesc_open }, /* open */ 917 { &vop_close_desc, fdesc_close }, /* close */ 918 { &vop_access_desc, fdesc_access }, /* access */ 919 { &vop_getattr_desc, fdesc_getattr }, /* getattr */ 920 { &vop_setattr_desc, fdesc_setattr }, /* setattr */ 921 { &vop_read_desc, fdesc_read }, /* read */ 922 { &vop_write_desc, fdesc_write }, /* write */ 923 { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */ 924 { &vop_select_desc, fdesc_select }, /* select */ 925 { &vop_mmap_desc, fdesc_mmap }, /* mmap */ 926 { &vop_fsync_desc, fdesc_fsync }, /* fsync */ 927 { &vop_seek_desc, fdesc_seek }, /* seek */ 928 { &vop_remove_desc, fdesc_remove }, /* remove */ 929 { &vop_link_desc, fdesc_link }, /* link */ 930 { &vop_rename_desc, fdesc_rename }, /* rename */ 931 { &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */ 932 { &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */ 933 { &vop_symlink_desc, fdesc_symlink }, /* symlink */ 934 { &vop_readdir_desc, fdesc_readdir }, /* readdir */ 935 { &vop_readlink_desc, fdesc_readlink }, /* readlink */ 936 { &vop_abortop_desc, fdesc_abortop }, /* abortop */ 937 { &vop_inactive_desc, fdesc_inactive }, /* inactive */ 938 { &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */ 939 { &vop_lock_desc, fdesc_lock }, /* lock */ 940 { &vop_unlock_desc, fdesc_unlock }, /* unlock */ 941 { &vop_bmap_desc, fdesc_bmap }, /* bmap */ 942 { &vop_strategy_desc, fdesc_strategy }, /* strategy */ 943 { &vop_print_desc, fdesc_print }, /* print */ 944 { &vop_islocked_desc, fdesc_islocked }, /* islocked */ 945 { &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */ 946 { &vop_advlock_desc, fdesc_advlock }, /* advlock */ 947 { &vop_blkatoff_desc, fdesc_blkatoff }, /* blkatoff */ 948 { &vop_valloc_desc, fdesc_valloc }, /* valloc */ 949 { &vop_vfree_desc, fdesc_vfree }, /* vfree */ 950 { &vop_truncate_desc, fdesc_truncate }, /* truncate */ 951 { &vop_update_desc, fdesc_update }, /* update */ 952 { &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */ 953 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 954 }; 955 struct vnodeopv_desc fdesc_vnodeop_opv_desc = 956 { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; 957
Indexes created Wed Oct 22 06:10:02 GMT 2025