fdesc_vnops.c revision 1.33
1 /* $NetBSD: fdesc_vnops.c,v 1.33 1996/06/14 09:27:23 mrg 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/socketvar.h> 55 #include <sys/filedesc.h> 56 #include <sys/vnode.h> 57 #include <sys/malloc.h> 58 #include <sys/conf.h> 59 #include <sys/file.h> 60 #include <sys/stat.h> 61 #include <sys/mount.h> 62 #include <sys/namei.h> 63 #include <sys/buf.h> 64 #include <sys/dirent.h> 65 #include <sys/tty.h> 66 #include <miscfs/fdesc/fdesc.h> 67 68 #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL) 69 70 #define FDL_WANT 0x01 71 #define FDL_LOCKED 0x02 72 static int fdcache_lock; 73 74 dev_t devctty; 75 76 #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1) 77 FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2 78 #endif 79 80 #define NFDCACHE 4 81 82 #define FD_NHASH(ix) \ 83 (&fdhashtbl[(ix) & fdhash]) 84 LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl; 85 u_long fdhash; 86 87 int fdesc_badop __P((void *)); 88 int fdesc_enotsupp __P((void *)); 89 90 int fdesc_lookup __P((void *)); 91 #define fdesc_create fdesc_enotsupp 92 #define fdesc_mknod fdesc_enotsupp 93 int fdesc_open __P((void *)); 94 #define fdesc_close nullop 95 #define fdesc_access nullop 96 int fdesc_getattr __P((void *)); 97 int fdesc_setattr __P((void *)); 98 int fdesc_read __P((void *)); 99 int fdesc_write __P((void *)); 100 int fdesc_ioctl __P((void *)); 101 int fdesc_select __P((void *)); 102 #define fdesc_mmap fdesc_enotsupp 103 #define fdesc_fsync nullop 104 #define fdesc_seek nullop 105 #define fdesc_remove fdesc_enotsupp 106 int fdesc_link __P((void *)); 107 #define fdesc_rename fdesc_enotsupp 108 #define fdesc_mkdir fdesc_enotsupp 109 #define fdesc_rmdir fdesc_enotsupp 110 int fdesc_symlink __P((void *)); 111 int fdesc_readdir __P((void *)); 112 int fdesc_readlink __P((void *)); 113 int fdesc_abortop __P((void *)); 114 int fdesc_inactive __P((void *)); 115 int fdesc_reclaim __P((void *)); 116 #define fdesc_lock nullop 117 #define fdesc_unlock nullop 118 #define fdesc_bmap fdesc_badop 119 #define fdesc_strategy fdesc_badop 120 int fdesc_print __P((void *)); 121 int fdesc_pathconf __P((void *)); 122 #define fdesc_islocked nullop 123 #define fdesc_advlock fdesc_enotsupp 124 #define fdesc_blkatoff fdesc_enotsupp 125 #define fdesc_valloc fdesc_enotsupp 126 int fdesc_vfree __P((void *)); 127 #define fdesc_truncate fdesc_enotsupp 128 #define fdesc_update fdesc_enotsupp 129 #define fdesc_bwrite fdesc_enotsupp 130 131 static int fdesc_attr __P((int, struct vattr *, struct ucred *, struct proc *)); 132 133 int (**fdesc_vnodeop_p) __P((void *)); 134 struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = { 135 { &vop_default_desc, vn_default_error }, 136 { &vop_lookup_desc, fdesc_lookup }, /* lookup */ 137 { &vop_create_desc, fdesc_create }, /* create */ 138 { &vop_mknod_desc, fdesc_mknod }, /* mknod */ 139 { &vop_open_desc, fdesc_open }, /* open */ 140 { &vop_close_desc, fdesc_close }, /* close */ 141 { &vop_access_desc, fdesc_access }, /* access */ 142 { &vop_getattr_desc, fdesc_getattr }, /* getattr */ 143 { &vop_setattr_desc, fdesc_setattr }, /* setattr */ 144 { &vop_read_desc, fdesc_read }, /* read */ 145 { &vop_write_desc, fdesc_write }, /* write */ 146 { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */ 147 { &vop_select_desc, fdesc_select }, /* select */ 148 { &vop_mmap_desc, fdesc_mmap }, /* mmap */ 149 { &vop_fsync_desc, fdesc_fsync }, /* fsync */ 150 { &vop_seek_desc, fdesc_seek }, /* seek */ 151 { &vop_remove_desc, fdesc_remove }, /* remove */ 152 { &vop_link_desc, fdesc_link }, /* link */ 153 { &vop_rename_desc, fdesc_rename }, /* rename */ 154 { &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */ 155 { &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */ 156 { &vop_symlink_desc, fdesc_symlink }, /* symlink */ 157 { &vop_readdir_desc, fdesc_readdir }, /* readdir */ 158 { &vop_readlink_desc, fdesc_readlink }, /* readlink */ 159 { &vop_abortop_desc, fdesc_abortop }, /* abortop */ 160 { &vop_inactive_desc, fdesc_inactive }, /* inactive */ 161 { &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */ 162 { &vop_lock_desc, fdesc_lock }, /* lock */ 163 { &vop_unlock_desc, fdesc_unlock }, /* unlock */ 164 { &vop_bmap_desc, fdesc_bmap }, /* bmap */ 165 { &vop_strategy_desc, fdesc_strategy }, /* strategy */ 166 { &vop_print_desc, fdesc_print }, /* print */ 167 { &vop_islocked_desc, fdesc_islocked }, /* islocked */ 168 { &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */ 169 { &vop_advlock_desc, fdesc_advlock }, /* advlock */ 170 { &vop_blkatoff_desc, fdesc_blkatoff }, /* blkatoff */ 171 { &vop_valloc_desc, fdesc_valloc }, /* valloc */ 172 { &vop_vfree_desc, fdesc_vfree }, /* vfree */ 173 { &vop_truncate_desc, fdesc_truncate }, /* truncate */ 174 { &vop_update_desc, fdesc_update }, /* update */ 175 { &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */ 176 { (struct vnodeop_desc*)NULL, (int(*) __P((void *)))NULL } 177 }; 178 179 struct vnodeopv_desc fdesc_vnodeop_opv_desc = 180 { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; 181 182 /* 183 * Initialise cache headers 184 */ 185 void 186 fdesc_init() 187 { 188 int cttymajor; 189 190 /* locate the major number */ 191 for (cttymajor = 0; cttymajor < nchrdev; cttymajor++) 192 if (cdevsw[cttymajor].d_open == cttyopen) 193 break; 194 devctty = makedev(cttymajor, 0); 195 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash); 196 } 197 198 int 199 fdesc_allocvp(ftype, ix, mp, vpp) 200 fdntype ftype; 201 int ix; 202 struct mount *mp; 203 struct vnode **vpp; 204 { 205 struct fdhashhead *fc; 206 struct fdescnode *fd; 207 int error = 0; 208 209 fc = FD_NHASH(ix); 210 loop: 211 for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) { 212 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) { 213 if (vget(fd->fd_vnode, 0)) 214 goto loop; 215 *vpp = fd->fd_vnode; 216 return (error); 217 } 218 } 219 220 /* 221 * otherwise lock the array while we call getnewvnode 222 * since that can block. 223 */ 224 if (fdcache_lock & FDL_LOCKED) { 225 fdcache_lock |= FDL_WANT; 226 sleep((caddr_t) &fdcache_lock, PINOD); 227 goto loop; 228 } 229 fdcache_lock |= FDL_LOCKED; 230 231 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp); 232 if (error) 233 goto out; 234 MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK); 235 (*vpp)->v_data = fd; 236 fd->fd_vnode = *vpp; 237 fd->fd_type = ftype; 238 fd->fd_fd = -1; 239 fd->fd_link = 0; 240 fd->fd_ix = ix; 241 LIST_INSERT_HEAD(fc, fd, fd_hash); 242 243 out:; 244 fdcache_lock &= ~FDL_LOCKED; 245 246 if (fdcache_lock & FDL_WANT) { 247 fdcache_lock &= ~FDL_WANT; 248 wakeup((caddr_t) &fdcache_lock); 249 } 250 251 return (error); 252 } 253 254 /* 255 * vp is the current namei directory 256 * ndp is the name to locate in that directory... 257 */ 258 int 259 fdesc_lookup(v) 260 void *v; 261 { 262 struct vop_lookup_args /* { 263 struct vnode * a_dvp; 264 struct vnode ** a_vpp; 265 struct componentname * a_cnp; 266 } */ *ap = v; 267 struct vnode **vpp = ap->a_vpp; 268 struct vnode *dvp = ap->a_dvp; 269 char *pname; 270 struct proc *p; 271 int nfiles; 272 unsigned fd = 0; 273 int error; 274 struct vnode *fvp; 275 char *ln; 276 277 pname = ap->a_cnp->cn_nameptr; 278 if (ap->a_cnp->cn_namelen == 1 && *pname == '.') { 279 *vpp = dvp; 280 VREF(dvp); 281 VOP_LOCK(dvp); 282 return (0); 283 } 284 285 p = ap->a_cnp->cn_proc; 286 nfiles = p->p_fd->fd_nfiles; 287 288 switch (VTOFDESC(dvp)->fd_type) { 289 default: 290 case Flink: 291 case Fdesc: 292 case Fctty: 293 error = ENOTDIR; 294 goto bad; 295 296 case Froot: 297 if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "fd", 2) == 0) { 298 error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp); 299 if (error) 300 goto bad; 301 *vpp = fvp; 302 fvp->v_type = VDIR; 303 VOP_LOCK(fvp); 304 return (0); 305 } 306 307 if (ap->a_cnp->cn_namelen == 3 && bcmp(pname, "tty", 3) == 0) { 308 struct vnode *ttyvp = cttyvp(p); 309 if (ttyvp == NULL) { 310 error = ENXIO; 311 goto bad; 312 } 313 error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp); 314 if (error) 315 goto bad; 316 *vpp = fvp; 317 fvp->v_type = VCHR; 318 VOP_LOCK(fvp); 319 return (0); 320 } 321 322 ln = 0; 323 switch (ap->a_cnp->cn_namelen) { 324 case 5: 325 if (bcmp(pname, "stdin", 5) == 0) { 326 ln = "fd/0"; 327 fd = FD_STDIN; 328 } 329 break; 330 case 6: 331 if (bcmp(pname, "stdout", 6) == 0) { 332 ln = "fd/1"; 333 fd = FD_STDOUT; 334 } else 335 if (bcmp(pname, "stderr", 6) == 0) { 336 ln = "fd/2"; 337 fd = FD_STDERR; 338 } 339 break; 340 } 341 342 if (ln) { 343 error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp); 344 if (error) 345 goto bad; 346 VTOFDESC(fvp)->fd_link = ln; 347 *vpp = fvp; 348 fvp->v_type = VLNK; 349 VOP_LOCK(fvp); 350 return (0); 351 } else { 352 error = ENOENT; 353 goto bad; 354 } 355 356 /* FALL THROUGH */ 357 358 case Fdevfd: 359 if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "..", 2) == 0) { 360 error = fdesc_root(dvp->v_mount, vpp); 361 return (error); 362 } 363 364 fd = 0; 365 while (*pname >= '0' && *pname <= '9') { 366 fd = 10 * fd + *pname++ - '0'; 367 if (fd >= nfiles) 368 break; 369 } 370 371 if (*pname != '\0') { 372 error = ENOENT; 373 goto bad; 374 } 375 376 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) { 377 error = EBADF; 378 goto bad; 379 } 380 381 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp); 382 if (error) 383 goto bad; 384 VTOFDESC(fvp)->fd_fd = fd; 385 *vpp = fvp; 386 return (0); 387 } 388 389 bad:; 390 *vpp = NULL; 391 return (error); 392 } 393 394 int 395 fdesc_open(v) 396 void *v; 397 { 398 struct vop_open_args /* { 399 struct vnode *a_vp; 400 int a_mode; 401 struct ucred *a_cred; 402 struct proc *a_p; 403 } */ *ap = v; 404 struct vnode *vp = ap->a_vp; 405 406 switch (VTOFDESC(vp)->fd_type) { 407 case Fdesc: 408 /* 409 * XXX Kludge: set p->p_dupfd to contain the value of the 410 * the file descriptor being sought for duplication. The error 411 * return ensures that the vnode for this device will be 412 * released by vn_open. Open will detect this special error and 413 * take the actions in dupfdopen. Other callers of vn_open or 414 * VOP_OPEN will simply report the error. 415 */ 416 ap->a_p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */ 417 return (ENODEV); 418 419 case Fctty: 420 return (cttyopen(devctty, ap->a_mode, 0, ap->a_p)); 421 case Froot: 422 case Fdevfd: 423 case Flink: 424 break; 425 } 426 427 return (0); 428 } 429 430 static int 431 fdesc_attr(fd, vap, cred, p) 432 int fd; 433 struct vattr *vap; 434 struct ucred *cred; 435 struct proc *p; 436 { 437 struct filedesc *fdp = p->p_fd; 438 struct file *fp; 439 struct stat stb; 440 int error; 441 442 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) 443 return (EBADF); 444 445 switch (fp->f_type) { 446 case DTYPE_VNODE: 447 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, p); 448 if (error == 0 && vap->va_type == VDIR) { 449 /* 450 * directories can cause loops in the namespace, 451 * so turn off the 'x' bits to avoid trouble. 452 */ 453 vap->va_mode &= ~((VEXEC)|(VEXEC>>3)|(VEXEC>>6)); 454 } 455 break; 456 457 case DTYPE_SOCKET: 458 error = soo_stat((struct socket *)fp->f_data, &stb); 459 if (error == 0) { 460 vattr_null(vap); 461 vap->va_type = VSOCK; 462 vap->va_mode = stb.st_mode; 463 vap->va_nlink = stb.st_nlink; 464 vap->va_uid = stb.st_uid; 465 vap->va_gid = stb.st_gid; 466 vap->va_fsid = stb.st_dev; 467 vap->va_fileid = stb.st_ino; 468 vap->va_size = stb.st_size; 469 vap->va_blocksize = stb.st_blksize; 470 vap->va_atime = stb.st_atimespec; 471 vap->va_mtime = stb.st_mtimespec; 472 vap->va_ctime = stb.st_ctimespec; 473 vap->va_gen = stb.st_gen; 474 vap->va_flags = stb.st_flags; 475 vap->va_rdev = stb.st_rdev; 476 vap->va_bytes = stb.st_blocks * stb.st_blksize; 477 } 478 break; 479 480 default: 481 panic("fdesc attr"); 482 break; 483 } 484 485 return (error); 486 } 487 488 int 489 fdesc_getattr(v) 490 void *v; 491 { 492 struct vop_getattr_args /* { 493 struct vnode *a_vp; 494 struct vattr *a_vap; 495 struct ucred *a_cred; 496 struct proc *a_p; 497 } */ *ap = v; 498 struct vnode *vp = ap->a_vp; 499 struct vattr *vap = ap->a_vap; 500 unsigned fd; 501 int error = 0; 502 503 switch (VTOFDESC(vp)->fd_type) { 504 case Froot: 505 case Fdevfd: 506 case Flink: 507 case Fctty: 508 VATTR_NULL(vap); 509 vap->va_fileid = VTOFDESC(vp)->fd_ix; 510 511 #define R_ALL (S_IRUSR|S_IRGRP|S_IROTH) 512 #define W_ALL (S_IWUSR|S_IWGRP|S_IWOTH) 513 #define X_ALL (S_IXUSR|S_IXGRP|S_IXOTH) 514 515 switch (VTOFDESC(vp)->fd_type) { 516 case Flink: 517 vap->va_mode = R_ALL|X_ALL; 518 vap->va_type = VLNK; 519 vap->va_rdev = 0; 520 vap->va_nlink = 1; 521 vap->va_size = strlen(VTOFDESC(vp)->fd_link); 522 break; 523 524 case Fctty: 525 vap->va_mode = R_ALL|W_ALL; 526 vap->va_type = VCHR; 527 vap->va_rdev = devctty; 528 vap->va_nlink = 1; 529 vap->va_size = 0; 530 break; 531 532 default: 533 vap->va_mode = R_ALL|X_ALL; 534 vap->va_type = VDIR; 535 vap->va_rdev = 0; 536 vap->va_nlink = 2; 537 vap->va_size = DEV_BSIZE; 538 break; 539 } 540 vap->va_uid = 0; 541 vap->va_gid = 0; 542 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 543 vap->va_blocksize = DEV_BSIZE; 544 vap->va_atime.tv_sec = boottime.tv_sec; 545 vap->va_atime.tv_nsec = 0; 546 vap->va_mtime = vap->va_atime; 547 vap->va_ctime = vap->va_mtime; 548 vap->va_gen = 0; 549 vap->va_flags = 0; 550 vap->va_bytes = 0; 551 break; 552 553 case Fdesc: 554 fd = VTOFDESC(vp)->fd_fd; 555 error = fdesc_attr(fd, vap, ap->a_cred, ap->a_p); 556 break; 557 558 default: 559 panic("fdesc_getattr"); 560 break; 561 } 562 563 if (error == 0) 564 vp->v_type = vap->va_type; 565 566 return (error); 567 } 568 569 int 570 fdesc_setattr(v) 571 void *v; 572 { 573 struct vop_setattr_args /* { 574 struct vnode *a_vp; 575 struct vattr *a_vap; 576 struct ucred *a_cred; 577 struct proc *a_p; 578 } */ *ap = v; 579 struct filedesc *fdp = ap->a_p->p_fd; 580 struct file *fp; 581 unsigned fd; 582 int error; 583 584 /* 585 * Can't mess with the root vnode 586 */ 587 switch (VTOFDESC(ap->a_vp)->fd_type) { 588 case Fdesc: 589 break; 590 591 case Fctty: 592 return (0); 593 594 default: 595 return (EACCES); 596 } 597 598 fd = VTOFDESC(ap->a_vp)->fd_fd; 599 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) { 600 return (EBADF); 601 } 602 603 /* 604 * Can setattr the underlying vnode, but not sockets! 605 */ 606 switch (fp->f_type) { 607 case DTYPE_VNODE: 608 error = VOP_SETATTR((struct vnode *) fp->f_data, ap->a_vap, ap->a_cred, ap->a_p); 609 break; 610 611 case DTYPE_SOCKET: 612 error = 0; 613 break; 614 615 default: 616 panic("fdesc setattr"); 617 break; 618 } 619 620 return (error); 621 } 622 623 #define UIO_MX 32 624 625 struct fdesc_target { 626 ino_t ft_fileno; 627 u_char ft_type; 628 u_char ft_namlen; 629 char *ft_name; 630 } fdesc_targets[] = { 631 /* NOTE: The name must be less than UIO_MX-16 chars in length */ 632 #define N(s) sizeof(s)-1, s 633 { FD_DEVFD, DT_DIR, N("fd") }, 634 { FD_STDIN, DT_LNK, N("stdin") }, 635 { FD_STDOUT, DT_LNK, N("stdout") }, 636 { FD_STDERR, DT_LNK, N("stderr") }, 637 { FD_CTTY, DT_UNKNOWN, N("tty") }, 638 #undef N 639 }; 640 static int nfdesc_targets = sizeof(fdesc_targets) / sizeof(fdesc_targets[0]); 641 642 int 643 fdesc_readdir(v) 644 void *v; 645 { 646 struct vop_readdir_args /* { 647 struct vnode *a_vp; 648 struct uio *a_uio; 649 struct ucred *a_cred; 650 int *a_eofflag; 651 u_long *a_cookies; 652 int a_ncookies; 653 } */ *ap = v; 654 struct uio *uio = ap->a_uio; 655 struct dirent d; 656 struct filedesc *fdp; 657 int i; 658 int error; 659 u_long *cookies = ap->a_cookies; 660 int ncookies = ap->a_ncookies; 661 662 switch (VTOFDESC(ap->a_vp)->fd_type) { 663 case Fctty: 664 return (0); 665 666 case Fdesc: 667 return (ENOTDIR); 668 669 default: 670 break; 671 } 672 673 fdp = uio->uio_procp->p_fd; 674 675 if (uio->uio_resid < UIO_MX) 676 return (EINVAL); 677 if (uio->uio_offset < 0) 678 return (EINVAL); 679 680 error = 0; 681 i = uio->uio_offset; 682 bzero((caddr_t)&d, UIO_MX); 683 d.d_reclen = UIO_MX; 684 685 if (VTOFDESC(ap->a_vp)->fd_type == Froot) { 686 struct fdesc_target *ft; 687 688 for (ft = &fdesc_targets[i]; 689 uio->uio_resid >= UIO_MX && i < nfdesc_targets; ft++, i++) { 690 switch (ft->ft_fileno) { 691 case FD_CTTY: 692 if (cttyvp(uio->uio_procp) == NULL) 693 continue; 694 break; 695 696 case FD_STDIN: 697 case FD_STDOUT: 698 case FD_STDERR: 699 if ((ft->ft_fileno - FD_STDIN) >= fdp->fd_nfiles) 700 continue; 701 if (fdp->fd_ofiles[ft->ft_fileno - FD_STDIN] == NULL) 702 continue; 703 break; 704 } 705 706 d.d_fileno = ft->ft_fileno; 707 d.d_namlen = ft->ft_namlen; 708 bcopy(ft->ft_name, d.d_name, ft->ft_namlen + 1); 709 d.d_type = ft->ft_type; 710 711 if ((error = uiomove((caddr_t)&d, UIO_MX, uio)) != 0) 712 break; 713 if (ncookies-- > 0) 714 *cookies++ = i + 1; 715 } 716 } else { 717 for (; i - 2 < fdp->fd_nfiles && uio->uio_resid >= UIO_MX; 718 i++) { 719 switch (i) { 720 case 0: 721 case 1: 722 d.d_fileno = FD_ROOT; /* XXX */ 723 d.d_namlen = i + 1; 724 bcopy("..", d.d_name, d.d_namlen); 725 d.d_name[i + 1] = '\0'; 726 d.d_type = DT_DIR; 727 break; 728 729 default: 730 if (fdp->fd_ofiles[i - 2] == NULL) 731 continue; 732 d.d_fileno = i - 2 + FD_STDIN; 733 d.d_namlen = sprintf(d.d_name, "%d", i - 2); 734 d.d_type = DT_UNKNOWN; 735 break; 736 } 737 738 if ((error = uiomove((caddr_t)&d, UIO_MX, uio)) != 0) 739 break; 740 if (ncookies-- > 0) 741 *cookies++ = i + 1; 742 } 743 } 744 745 uio->uio_offset = i; 746 return (error); 747 } 748 749 int 750 fdesc_readlink(v) 751 void *v; 752 { 753 struct vop_readlink_args /* { 754 struct vnode *a_vp; 755 struct uio *a_uio; 756 struct ucred *a_cred; 757 } */ *ap = v; 758 struct vnode *vp = ap->a_vp; 759 int error; 760 761 if (vp->v_type != VLNK) 762 return (EPERM); 763 764 if (VTOFDESC(vp)->fd_type == Flink) { 765 char *ln = VTOFDESC(vp)->fd_link; 766 error = uiomove(ln, strlen(ln), ap->a_uio); 767 } else { 768 error = EOPNOTSUPP; 769 } 770 771 return (error); 772 } 773 774 int 775 fdesc_read(v) 776 void *v; 777 { 778 struct vop_read_args /* { 779 struct vnode *a_vp; 780 struct uio *a_uio; 781 int a_ioflag; 782 struct ucred *a_cred; 783 } */ *ap = v; 784 int error = EOPNOTSUPP; 785 786 switch (VTOFDESC(ap->a_vp)->fd_type) { 787 case Fctty: 788 error = cttyread(devctty, ap->a_uio, ap->a_ioflag); 789 break; 790 791 default: 792 error = EOPNOTSUPP; 793 break; 794 } 795 796 return (error); 797 } 798 799 int 800 fdesc_write(v) 801 void *v; 802 { 803 struct vop_write_args /* { 804 struct vnode *a_vp; 805 struct uio *a_uio; 806 int a_ioflag; 807 struct ucred *a_cred; 808 } */ *ap = v; 809 int error = EOPNOTSUPP; 810 811 switch (VTOFDESC(ap->a_vp)->fd_type) { 812 case Fctty: 813 error = cttywrite(devctty, ap->a_uio, ap->a_ioflag); 814 break; 815 816 default: 817 error = EOPNOTSUPP; 818 break; 819 } 820 821 return (error); 822 } 823 824 int 825 fdesc_ioctl(v) 826 void *v; 827 { 828 struct vop_ioctl_args /* { 829 struct vnode *a_vp; 830 u_long a_command; 831 caddr_t a_data; 832 int a_fflag; 833 struct ucred *a_cred; 834 struct proc *a_p; 835 } */ *ap = v; 836 int error = EOPNOTSUPP; 837 838 switch (VTOFDESC(ap->a_vp)->fd_type) { 839 case Fctty: 840 error = cttyioctl(devctty, ap->a_command, ap->a_data, 841 ap->a_fflag, ap->a_p); 842 break; 843 844 default: 845 error = EOPNOTSUPP; 846 break; 847 } 848 849 return (error); 850 } 851 852 int 853 fdesc_select(v) 854 void *v; 855 { 856 struct vop_select_args /* { 857 struct vnode *a_vp; 858 int a_which; 859 int a_fflags; 860 struct ucred *a_cred; 861 struct proc *a_p; 862 } */ *ap = v; 863 int error = EOPNOTSUPP; 864 865 switch (VTOFDESC(ap->a_vp)->fd_type) { 866 case Fctty: 867 error = cttyselect(devctty, ap->a_fflags, ap->a_p); 868 break; 869 870 default: 871 error = EOPNOTSUPP; 872 break; 873 } 874 875 return (error); 876 } 877 878 int 879 fdesc_inactive(v) 880 void *v; 881 { 882 struct vop_inactive_args /* { 883 struct vnode *a_vp; 884 } */ *ap = v; 885 struct vnode *vp = ap->a_vp; 886 887 /* 888 * Clear out the v_type field to avoid 889 * nasty things happening in vgone(). 890 */ 891 vp->v_type = VNON; 892 return (0); 893 } 894 895 int 896 fdesc_reclaim(v) 897 void *v; 898 { 899 struct vop_reclaim_args /* { 900 struct vnode *a_vp; 901 } */ *ap = v; 902 struct vnode *vp = ap->a_vp; 903 struct fdescnode *fd = VTOFDESC(vp); 904 905 LIST_REMOVE(fd, fd_hash); 906 FREE(vp->v_data, M_TEMP); 907 vp->v_data = 0; 908 909 return (0); 910 } 911 912 /* 913 * Return POSIX pathconf information applicable to special devices. 914 */ 915 int 916 fdesc_pathconf(v) 917 void *v; 918 { 919 struct vop_pathconf_args /* { 920 struct vnode *a_vp; 921 int a_name; 922 register_t *a_retval; 923 } */ *ap = v; 924 925 switch (ap->a_name) { 926 case _PC_LINK_MAX: 927 *ap->a_retval = LINK_MAX; 928 return (0); 929 case _PC_MAX_CANON: 930 *ap->a_retval = MAX_CANON; 931 return (0); 932 case _PC_MAX_INPUT: 933 *ap->a_retval = MAX_INPUT; 934 return (0); 935 case _PC_PIPE_BUF: 936 *ap->a_retval = PIPE_BUF; 937 return (0); 938 case _PC_CHOWN_RESTRICTED: 939 *ap->a_retval = 1; 940 return (0); 941 case _PC_VDISABLE: 942 *ap->a_retval = _POSIX_VDISABLE; 943 return (0); 944 default: 945 return (EINVAL); 946 } 947 /* NOTREACHED */ 948 } 949 950 /* 951 * Print out the contents of a /dev/fd vnode. 952 */ 953 /* ARGSUSED */ 954 int 955 fdesc_print(v) 956 void *v; 957 { 958 printf("tag VT_NON, fdesc vnode\n"); 959 return (0); 960 } 961 962 int 963 fdesc_vfree(v) 964 void *v; 965 { 966 return (0); 967 } 968 969 int 970 fdesc_link(v) 971 void *v; 972 { 973 struct vop_link_args /* { 974 struct vnode *a_dvp; 975 struct vnode *a_vp; 976 struct componentname *a_cnp; 977 } */ *ap = v; 978 979 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 980 vput(ap->a_dvp); 981 return (EROFS); 982 } 983 984 int 985 fdesc_symlink(v) 986 void *v; 987 { 988 struct vop_symlink_args /* { 989 struct vnode *a_dvp; 990 struct vnode **a_vpp; 991 struct componentname *a_cnp; 992 struct vattr *a_vap; 993 char *a_target; 994 } */ *ap = v; 995 996 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 997 vput(ap->a_dvp); 998 return (EROFS); 999 } 1000 1001 int 1002 fdesc_abortop(v) 1003 void *v; 1004 { 1005 struct vop_abortop_args /* { 1006 struct vnode *a_dvp; 1007 struct componentname *a_cnp; 1008 } */ *ap = v; 1009 1010 if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF) 1011 FREE(ap->a_cnp->cn_pnbuf, M_NAMEI); 1012 return (0); 1013 } 1014 1015 /* 1016 * /dev/fd vnode unsupported operation 1017 */ 1018 /*ARGSUSED*/ 1019 int 1020 fdesc_enotsupp(v) 1021 void *v; 1022 { 1023 1024 return (EOPNOTSUPP); 1025 } 1026 1027 /* 1028 * /dev/fd "should never get here" operation 1029 */ 1030 /*ARGSUSED*/ 1031 int 1032 fdesc_badop(v) 1033 void *v; 1034 { 1035 1036 panic("fdesc: bad op"); 1037 /* NOTREACHED */ 1038 } 1039
Indexes created Wed Oct 22 06:10:02 GMT 2025