fdesc_vnops.c revision 1.58.2.6
1 /* $NetBSD: fdesc_vnops.c,v 1.58.2.6 2002/09/17 21:22:38 nathanw 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 8.17 (Berkeley) 5/22/95 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/cdefs.h> 48 __KERNEL_RCSID(0, "$NetBSD: fdesc_vnops.c,v 1.58.2.6 2002/09/17 21:22:38 nathanw Exp $"); 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/time.h> 53 #include <sys/proc.h> 54 #include <sys/kernel.h> /* boottime */ 55 #include <sys/resourcevar.h> 56 #include <sys/socketvar.h> 57 #include <sys/filedesc.h> 58 #include <sys/vnode.h> 59 #include <sys/malloc.h> 60 #include <sys/conf.h> 61 #include <sys/file.h> 62 #include <sys/stat.h> 63 #include <sys/mount.h> 64 #include <sys/namei.h> 65 #include <sys/buf.h> 66 #include <sys/dirent.h> 67 #include <sys/tty.h> 68 69 #include <miscfs/fdesc/fdesc.h> 70 #include <miscfs/genfs/genfs.h> 71 72 #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL) 73 74 #define FDL_WANT 0x01 75 #define FDL_LOCKED 0x02 76 static int fdcache_lock; 77 78 dev_t devctty; 79 80 #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1) 81 FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2 82 #endif 83 84 #define NFDCACHE 4 85 86 #define FD_NHASH(ix) \ 87 (&fdhashtbl[(ix) & fdhash]) 88 LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl; 89 u_long fdhash; 90 91 int fdesc_lookup __P((void *)); 92 #define fdesc_create genfs_eopnotsupp_rele 93 #define fdesc_mknod genfs_eopnotsupp_rele 94 int fdesc_open __P((void *)); 95 #define fdesc_close genfs_nullop 96 #define fdesc_access genfs_nullop 97 int fdesc_getattr __P((void *)); 98 int fdesc_setattr __P((void *)); 99 int fdesc_read __P((void *)); 100 int fdesc_write __P((void *)); 101 int fdesc_ioctl __P((void *)); 102 int fdesc_poll __P((void *)); 103 #define fdesc_mmap genfs_eopnotsupp 104 #define fdesc_fcntl genfs_fcntl 105 #define fdesc_fsync genfs_nullop 106 #define fdesc_seek genfs_seek 107 #define fdesc_remove genfs_eopnotsupp_rele 108 int fdesc_link __P((void *)); 109 #define fdesc_rename genfs_eopnotsupp_rele 110 #define fdesc_mkdir genfs_eopnotsupp_rele 111 #define fdesc_rmdir genfs_eopnotsupp_rele 112 int fdesc_symlink __P((void *)); 113 int fdesc_readdir __P((void *)); 114 int fdesc_readlink __P((void *)); 115 #define fdesc_abortop genfs_abortop 116 int fdesc_inactive __P((void *)); 117 int fdesc_reclaim __P((void *)); 118 #define fdesc_lock genfs_lock 119 #define fdesc_unlock genfs_unlock 120 #define fdesc_bmap genfs_badop 121 #define fdesc_strategy genfs_badop 122 int fdesc_print __P((void *)); 123 int fdesc_pathconf __P((void *)); 124 #define fdesc_islocked genfs_islocked 125 #define fdesc_advlock genfs_einval 126 #define fdesc_blkatoff genfs_eopnotsupp 127 #define fdesc_valloc genfs_eopnotsupp 128 #define fdesc_vfree genfs_nullop 129 #define fdesc_truncate genfs_eopnotsupp 130 #define fdesc_update genfs_nullop 131 #define fdesc_bwrite genfs_eopnotsupp 132 #define fdesc_revoke genfs_revoke 133 #define fdesc_putpages genfs_null_putpages 134 135 static int fdesc_attr __P((int, struct vattr *, struct ucred *, struct proc *)); 136 137 int (**fdesc_vnodeop_p) __P((void *)); 138 const struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = { 139 { &vop_default_desc, vn_default_error }, 140 { &vop_lookup_desc, fdesc_lookup }, /* lookup */ 141 { &vop_create_desc, fdesc_create }, /* create */ 142 { &vop_mknod_desc, fdesc_mknod }, /* mknod */ 143 { &vop_open_desc, fdesc_open }, /* open */ 144 { &vop_close_desc, fdesc_close }, /* close */ 145 { &vop_access_desc, fdesc_access }, /* access */ 146 { &vop_getattr_desc, fdesc_getattr }, /* getattr */ 147 { &vop_setattr_desc, fdesc_setattr }, /* setattr */ 148 { &vop_read_desc, fdesc_read }, /* read */ 149 { &vop_write_desc, fdesc_write }, /* write */ 150 { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */ 151 { &vop_fcntl_desc, fdesc_fcntl }, /* fcntl */ 152 { &vop_poll_desc, fdesc_poll }, /* poll */ 153 { &vop_revoke_desc, fdesc_revoke }, /* revoke */ 154 { &vop_mmap_desc, fdesc_mmap }, /* mmap */ 155 { &vop_fsync_desc, fdesc_fsync }, /* fsync */ 156 { &vop_seek_desc, fdesc_seek }, /* seek */ 157 { &vop_remove_desc, fdesc_remove }, /* remove */ 158 { &vop_link_desc, fdesc_link }, /* link */ 159 { &vop_rename_desc, fdesc_rename }, /* rename */ 160 { &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */ 161 { &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */ 162 { &vop_symlink_desc, fdesc_symlink }, /* symlink */ 163 { &vop_readdir_desc, fdesc_readdir }, /* readdir */ 164 { &vop_readlink_desc, fdesc_readlink }, /* readlink */ 165 { &vop_abortop_desc, fdesc_abortop }, /* abortop */ 166 { &vop_inactive_desc, fdesc_inactive }, /* inactive */ 167 { &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */ 168 { &vop_lock_desc, fdesc_lock }, /* lock */ 169 { &vop_unlock_desc, fdesc_unlock }, /* unlock */ 170 { &vop_bmap_desc, fdesc_bmap }, /* bmap */ 171 { &vop_strategy_desc, fdesc_strategy }, /* strategy */ 172 { &vop_print_desc, fdesc_print }, /* print */ 173 { &vop_islocked_desc, fdesc_islocked }, /* islocked */ 174 { &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */ 175 { &vop_advlock_desc, fdesc_advlock }, /* advlock */ 176 { &vop_blkatoff_desc, fdesc_blkatoff }, /* blkatoff */ 177 { &vop_valloc_desc, fdesc_valloc }, /* valloc */ 178 { &vop_vfree_desc, fdesc_vfree }, /* vfree */ 179 { &vop_truncate_desc, fdesc_truncate }, /* truncate */ 180 { &vop_update_desc, fdesc_update }, /* update */ 181 { &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */ 182 { &vop_putpages_desc, fdesc_putpages }, /* putpages */ 183 { NULL, NULL } 184 }; 185 186 const struct vnodeopv_desc fdesc_vnodeop_opv_desc = 187 { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; 188 189 extern const struct cdevsw ctty_cdevsw; 190 191 /* 192 * Initialise cache headers 193 */ 194 void 195 fdesc_init() 196 { 197 int cttymajor; 198 199 /* locate the major number */ 200 cttymajor = cdevsw_lookup_major(&ctty_cdevsw); 201 devctty = makedev(cttymajor, 0); 202 fdhashtbl = hashinit(NFDCACHE, HASH_LIST, M_CACHE, M_NOWAIT, &fdhash); 203 } 204 205 /* 206 * Free hash table. 207 */ 208 void 209 fdesc_done() 210 { 211 hashdone(fdhashtbl, M_CACHE); 212 } 213 214 /* 215 * Return a locked vnode of the correct type. 216 */ 217 int 218 fdesc_allocvp(ftype, ix, mp, vpp) 219 fdntype ftype; 220 int ix; 221 struct mount *mp; 222 struct vnode **vpp; 223 { 224 struct fdhashhead *fc; 225 struct fdescnode *fd; 226 int error = 0; 227 228 fc = FD_NHASH(ix); 229 loop: 230 for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) { 231 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) { 232 if (vget(fd->fd_vnode, LK_EXCLUSIVE)) 233 goto loop; 234 *vpp = fd->fd_vnode; 235 return (error); 236 } 237 } 238 239 /* 240 * otherwise lock the array while we call getnewvnode 241 * since that can block. 242 */ 243 if (fdcache_lock & FDL_LOCKED) { 244 fdcache_lock |= FDL_WANT; 245 (void) tsleep(&fdcache_lock, PINOD, "fdcache", 0); 246 goto loop; 247 } 248 fdcache_lock |= FDL_LOCKED; 249 250 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp); 251 if (error) 252 goto out; 253 MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK); 254 (*vpp)->v_data = fd; 255 fd->fd_vnode = *vpp; 256 fd->fd_type = ftype; 257 fd->fd_fd = -1; 258 fd->fd_link = 0; 259 fd->fd_ix = ix; 260 VOP_LOCK(*vpp, LK_EXCLUSIVE); 261 LIST_INSERT_HEAD(fc, fd, fd_hash); 262 263 out:; 264 fdcache_lock &= ~FDL_LOCKED; 265 266 if (fdcache_lock & FDL_WANT) { 267 fdcache_lock &= ~FDL_WANT; 268 wakeup((caddr_t) &fdcache_lock); 269 } 270 271 return (error); 272 } 273 274 /* 275 * vp is the current namei directory 276 * ndp is the name to locate in that directory... 277 */ 278 int 279 fdesc_lookup(v) 280 void *v; 281 { 282 struct vop_lookup_args /* { 283 struct vnode * a_dvp; 284 struct vnode ** a_vpp; 285 struct componentname * a_cnp; 286 } */ *ap = v; 287 struct vnode **vpp = ap->a_vpp; 288 struct vnode *dvp = ap->a_dvp; 289 struct componentname *cnp = ap->a_cnp; 290 struct proc *p = cnp->cn_proc; 291 const char *pname = cnp->cn_nameptr; 292 int nfiles = p->p_fd->fd_nfiles; 293 unsigned fd = 0; 294 int error; 295 struct vnode *fvp; 296 char *ln; 297 298 if (cnp->cn_namelen == 1 && *pname == '.') { 299 *vpp = dvp; 300 VREF(dvp); 301 return (0); 302 } 303 304 switch (VTOFDESC(dvp)->fd_type) { 305 default: 306 case Flink: 307 case Fdesc: 308 case Fctty: 309 error = ENOTDIR; 310 goto bad; 311 312 case Froot: 313 if (cnp->cn_namelen == 2 && memcmp(pname, "fd", 2) == 0) { 314 error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp); 315 if (error) 316 goto bad; 317 *vpp = fvp; 318 fvp->v_type = VDIR; 319 goto good; 320 } 321 322 if (cnp->cn_namelen == 3 && memcmp(pname, "tty", 3) == 0) { 323 struct vnode *ttyvp = cttyvp(p); 324 if (ttyvp == NULL) { 325 error = ENXIO; 326 goto bad; 327 } 328 error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp); 329 if (error) 330 goto bad; 331 *vpp = fvp; 332 fvp->v_type = VCHR; 333 goto good; 334 } 335 336 ln = 0; 337 switch (cnp->cn_namelen) { 338 case 5: 339 if (memcmp(pname, "stdin", 5) == 0) { 340 ln = "fd/0"; 341 fd = FD_STDIN; 342 } 343 break; 344 case 6: 345 if (memcmp(pname, "stdout", 6) == 0) { 346 ln = "fd/1"; 347 fd = FD_STDOUT; 348 } else 349 if (memcmp(pname, "stderr", 6) == 0) { 350 ln = "fd/2"; 351 fd = FD_STDERR; 352 } 353 break; 354 } 355 356 if (ln) { 357 error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp); 358 if (error) 359 goto bad; 360 VTOFDESC(fvp)->fd_link = ln; 361 *vpp = fvp; 362 fvp->v_type = VLNK; 363 goto good; 364 } else { 365 error = ENOENT; 366 goto bad; 367 } 368 369 /* FALL THROUGH */ 370 371 case Fdevfd: 372 if (cnp->cn_namelen == 2 && memcmp(pname, "..", 2) == 0) { 373 VOP_UNLOCK(dvp, 0); 374 cnp->cn_flags |= PDIRUNLOCK; 375 error = fdesc_root(dvp->v_mount, vpp); 376 if (error) 377 goto bad; 378 /* 379 * If we're at the last component and need the 380 * parent locked, undo the unlock above. 381 */ 382 if (((~cnp->cn_flags & (ISLASTCN | LOCKPARENT)) == 0) && 383 ((error = vn_lock(dvp, LK_EXCLUSIVE)) == 0)) 384 cnp->cn_flags &= ~PDIRUNLOCK; 385 return (error); 386 } 387 388 fd = 0; 389 while (*pname >= '0' && *pname <= '9') { 390 fd = 10 * fd + *pname++ - '0'; 391 if (fd >= nfiles) 392 break; 393 } 394 395 if (*pname != '\0') { 396 error = ENOENT; 397 goto bad; 398 } 399 400 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL || 401 FILE_IS_USABLE(p->p_fd->fd_ofiles[fd]) == 0) { 402 error = EBADF; 403 goto bad; 404 } 405 406 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp); 407 if (error) 408 goto bad; 409 VTOFDESC(fvp)->fd_fd = fd; 410 *vpp = fvp; 411 goto good; 412 } 413 414 bad:; 415 *vpp = NULL; 416 return (error); 417 418 good:; 419 /* 420 * As "." was special cased above, we now unlock the parent if we're 421 * suppoed to. We're only supposed to not unlock if this is the 422 * last component, and the caller requested LOCKPARENT. So if either 423 * condition is false, unlock. 424 */ 425 if (((~cnp->cn_flags) & (ISLASTCN | LOCKPARENT)) != 0) { 426 VOP_UNLOCK(dvp, 0); 427 cnp->cn_flags |= PDIRUNLOCK; 428 } 429 return (0); 430 } 431 432 int 433 fdesc_open(v) 434 void *v; 435 { 436 struct vop_open_args /* { 437 struct vnode *a_vp; 438 int a_mode; 439 struct ucred *a_cred; 440 struct proc *a_p; 441 } */ *ap = v; 442 struct vnode *vp = ap->a_vp; 443 444 switch (VTOFDESC(vp)->fd_type) { 445 case Fdesc: 446 /* 447 * XXX Kludge: set p->p_dupfd to contain the value of the 448 * the file descriptor being sought for duplication. The error 449 * return ensures that the vnode for this device will be 450 * released by vn_open. Open will detect this special error and 451 * take the actions in dupfdopen. Other callers of vn_open or 452 * VOP_OPEN will simply report the error. 453 */ 454 ap->a_p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */ 455 return (ENODEV); 456 457 case Fctty: 458 return ((*ctty_cdevsw.d_open)(devctty, ap->a_mode, 0, ap->a_p)); 459 case Froot: 460 case Fdevfd: 461 case Flink: 462 break; 463 } 464 465 return (0); 466 } 467 468 static int 469 fdesc_attr(fd, vap, cred, p) 470 int fd; 471 struct vattr *vap; 472 struct ucred *cred; 473 struct proc *p; 474 { 475 struct filedesc *fdp = p->p_fd; 476 struct file *fp; 477 struct stat stb; 478 int error; 479 480 if ((fp = fd_getfile(fdp, fd)) == NULL) 481 return (EBADF); 482 483 switch (fp->f_type) { 484 case DTYPE_VNODE: 485 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, p); 486 if (error == 0 && vap->va_type == VDIR) { 487 /* 488 * directories can cause loops in the namespace, 489 * so turn off the 'x' bits to avoid trouble. 490 */ 491 vap->va_mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH); 492 } 493 break; 494 495 default: 496 FILE_USE(fp); 497 memset(&stb, 0, sizeof(stb)); 498 error = (*fp->f_ops->fo_stat)(fp, &stb, p); 499 FILE_UNUSE(fp, p); 500 if (error) 501 break; 502 503 vattr_null(vap); 504 switch(fp->f_type) { 505 case DTYPE_SOCKET: 506 vap->va_type = VSOCK; 507 break; 508 case DTYPE_PIPE: 509 vap->va_type = VFIFO; 510 break; 511 default: 512 /* use VNON perhaps? */ 513 vap->va_type = VBAD; 514 break; 515 } 516 vap->va_mode = stb.st_mode; 517 vap->va_nlink = stb.st_nlink; 518 vap->va_uid = stb.st_uid; 519 vap->va_gid = stb.st_gid; 520 vap->va_fsid = stb.st_dev; 521 vap->va_fileid = stb.st_ino; 522 vap->va_size = stb.st_size; 523 vap->va_blocksize = stb.st_blksize; 524 vap->va_atime = stb.st_atimespec; 525 vap->va_mtime = stb.st_mtimespec; 526 vap->va_ctime = stb.st_ctimespec; 527 vap->va_gen = stb.st_gen; 528 vap->va_flags = stb.st_flags; 529 vap->va_rdev = stb.st_rdev; 530 vap->va_bytes = stb.st_blocks * stb.st_blksize; 531 break; 532 } 533 534 return (error); 535 } 536 537 int 538 fdesc_getattr(v) 539 void *v; 540 { 541 struct vop_getattr_args /* { 542 struct vnode *a_vp; 543 struct vattr *a_vap; 544 struct ucred *a_cred; 545 struct proc *a_p; 546 } */ *ap = v; 547 struct vnode *vp = ap->a_vp; 548 struct vattr *vap = ap->a_vap; 549 unsigned fd; 550 int error = 0; 551 552 switch (VTOFDESC(vp)->fd_type) { 553 case Froot: 554 case Fdevfd: 555 case Flink: 556 case Fctty: 557 VATTR_NULL(vap); 558 vap->va_fileid = VTOFDESC(vp)->fd_ix; 559 560 #define R_ALL (S_IRUSR|S_IRGRP|S_IROTH) 561 #define W_ALL (S_IWUSR|S_IWGRP|S_IWOTH) 562 #define X_ALL (S_IXUSR|S_IXGRP|S_IXOTH) 563 564 switch (VTOFDESC(vp)->fd_type) { 565 case Flink: 566 vap->va_mode = R_ALL|X_ALL; 567 vap->va_type = VLNK; 568 vap->va_rdev = 0; 569 vap->va_nlink = 1; 570 vap->va_size = strlen(VTOFDESC(vp)->fd_link); 571 break; 572 573 case Fctty: 574 vap->va_mode = R_ALL|W_ALL; 575 vap->va_type = VCHR; 576 vap->va_rdev = devctty; 577 vap->va_nlink = 1; 578 vap->va_size = 0; 579 break; 580 581 default: 582 vap->va_mode = R_ALL|X_ALL; 583 vap->va_type = VDIR; 584 vap->va_rdev = 0; 585 vap->va_nlink = 2; 586 vap->va_size = DEV_BSIZE; 587 break; 588 } 589 vap->va_uid = 0; 590 vap->va_gid = 0; 591 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 592 vap->va_blocksize = DEV_BSIZE; 593 vap->va_atime.tv_sec = boottime.tv_sec; 594 vap->va_atime.tv_nsec = 0; 595 vap->va_mtime = vap->va_atime; 596 vap->va_ctime = vap->va_mtime; 597 vap->va_gen = 0; 598 vap->va_flags = 0; 599 vap->va_bytes = 0; 600 break; 601 602 case Fdesc: 603 fd = VTOFDESC(vp)->fd_fd; 604 error = fdesc_attr(fd, vap, ap->a_cred, ap->a_p); 605 break; 606 607 default: 608 panic("fdesc_getattr"); 609 break; 610 } 611 612 if (error == 0) 613 vp->v_type = vap->va_type; 614 615 return (error); 616 } 617 618 int 619 fdesc_setattr(v) 620 void *v; 621 { 622 struct vop_setattr_args /* { 623 struct vnode *a_vp; 624 struct vattr *a_vap; 625 struct ucred *a_cred; 626 struct proc *a_p; 627 } */ *ap = v; 628 struct filedesc *fdp = ap->a_p->p_fd; 629 struct file *fp; 630 unsigned fd; 631 632 /* 633 * Can't mess with the root vnode 634 */ 635 switch (VTOFDESC(ap->a_vp)->fd_type) { 636 case Fdesc: 637 break; 638 639 case Fctty: 640 return (0); 641 642 default: 643 return (EACCES); 644 } 645 646 fd = VTOFDESC(ap->a_vp)->fd_fd; 647 if ((fp = fd_getfile(fdp, fd)) == NULL) 648 return (EBADF); 649 650 /* 651 * XXX: Can't reasonably set the attr's on any types currently. 652 * On vnode's this will cause truncation and socket/pipes make 653 * no sense. 654 */ 655 return (0); 656 } 657 658 #define UIO_MX 32 659 660 struct fdesc_target { 661 ino_t ft_fileno; 662 u_char ft_type; 663 u_char ft_namlen; 664 char *ft_name; 665 } fdesc_targets[] = { 666 /* NOTE: The name must be less than UIO_MX-16 chars in length */ 667 #define N(s) sizeof(s)-1, s 668 { FD_DEVFD, DT_DIR, N("fd") }, 669 { FD_STDIN, DT_LNK, N("stdin") }, 670 { FD_STDOUT, DT_LNK, N("stdout") }, 671 { FD_STDERR, DT_LNK, N("stderr") }, 672 { FD_CTTY, DT_UNKNOWN, N("tty") }, 673 #undef N 674 }; 675 static int nfdesc_targets = sizeof(fdesc_targets) / sizeof(fdesc_targets[0]); 676 677 int 678 fdesc_readdir(v) 679 void *v; 680 { 681 struct vop_readdir_args /* { 682 struct vnode *a_vp; 683 struct uio *a_uio; 684 struct ucred *a_cred; 685 int *a_eofflag; 686 off_t **a_cookies; 687 int *a_ncookies; 688 } */ *ap = v; 689 struct uio *uio = ap->a_uio; 690 struct dirent d; 691 struct filedesc *fdp; 692 off_t i; 693 int error; 694 off_t *cookies = NULL; 695 int ncookies = 0; 696 697 switch (VTOFDESC(ap->a_vp)->fd_type) { 698 case Fctty: 699 return (0); 700 701 case Fdesc: 702 return (ENOTDIR); 703 704 default: 705 break; 706 } 707 708 fdp = uio->uio_procp->p_fd; 709 710 if (uio->uio_resid < UIO_MX) 711 return (EINVAL); 712 if (uio->uio_offset < 0) 713 return (EINVAL); 714 715 error = 0; 716 i = uio->uio_offset; 717 memset((caddr_t)&d, 0, UIO_MX); 718 d.d_reclen = UIO_MX; 719 if (ap->a_ncookies) 720 ncookies = (uio->uio_resid / UIO_MX); 721 722 if (VTOFDESC(ap->a_vp)->fd_type == Froot) { 723 struct fdesc_target *ft; 724 725 if (i >= nfdesc_targets) 726 return 0; 727 728 if (ap->a_ncookies) { 729 ncookies = min(ncookies, (nfdesc_targets - i)); 730 cookies = malloc(ncookies * sizeof(off_t), 731 M_TEMP, M_WAITOK); 732 *ap->a_cookies = cookies; 733 *ap->a_ncookies = ncookies; 734 } 735 736 for (ft = &fdesc_targets[i]; 737 uio->uio_resid >= UIO_MX && i < nfdesc_targets; ft++, i++) { 738 switch (ft->ft_fileno) { 739 case FD_CTTY: 740 if (cttyvp(uio->uio_procp) == NULL) 741 continue; 742 break; 743 744 case FD_STDIN: 745 case FD_STDOUT: 746 case FD_STDERR: 747 if ((ft->ft_fileno - FD_STDIN) >= fdp->fd_nfiles) 748 continue; 749 if (fdp->fd_ofiles[ft->ft_fileno - FD_STDIN] == NULL 750 || FILE_IS_USABLE(fdp->fd_ofiles[ft->ft_fileno - FD_STDIN]) == 0) 751 continue; 752 break; 753 } 754 755 d.d_fileno = ft->ft_fileno; 756 d.d_namlen = ft->ft_namlen; 757 memcpy(d.d_name, ft->ft_name, ft->ft_namlen + 1); 758 d.d_type = ft->ft_type; 759 760 if ((error = uiomove((caddr_t)&d, UIO_MX, uio)) != 0) 761 break; 762 if (cookies) 763 *cookies++ = i + 1; 764 } 765 } else { 766 if (ap->a_ncookies) { 767 ncookies = min(ncookies, (fdp->fd_nfiles + 2)); 768 cookies = malloc(ncookies * sizeof(off_t), 769 M_TEMP, M_WAITOK); 770 *ap->a_cookies = cookies; 771 *ap->a_ncookies = ncookies; 772 } 773 for (; i - 2 < fdp->fd_nfiles && uio->uio_resid >= UIO_MX; 774 i++) { 775 switch (i) { 776 case 0: 777 case 1: 778 d.d_fileno = FD_ROOT; /* XXX */ 779 d.d_namlen = i + 1; 780 memcpy(d.d_name, "..", d.d_namlen); 781 d.d_name[i + 1] = '\0'; 782 d.d_type = DT_DIR; 783 break; 784 785 default: 786 if (fdp->fd_ofiles[i - 2] == NULL || 787 FILE_IS_USABLE(fdp->fd_ofiles[i - 2]) == 0) 788 continue; 789 d.d_fileno = i - 2 + FD_STDIN; 790 d.d_namlen = sprintf(d.d_name, "%d", (int) i - 2); 791 d.d_type = DT_UNKNOWN; 792 break; 793 } 794 795 if ((error = uiomove((caddr_t)&d, UIO_MX, uio)) != 0) 796 break; 797 if (cookies) 798 *cookies++ = i + 1; 799 } 800 } 801 802 if (ap->a_ncookies && error) { 803 free(*ap->a_cookies, M_TEMP); 804 *ap->a_ncookies = 0; 805 *ap->a_cookies = NULL; 806 } 807 808 uio->uio_offset = i; 809 return (error); 810 } 811 812 int 813 fdesc_readlink(v) 814 void *v; 815 { 816 struct vop_readlink_args /* { 817 struct vnode *a_vp; 818 struct uio *a_uio; 819 struct ucred *a_cred; 820 } */ *ap = v; 821 struct vnode *vp = ap->a_vp; 822 int error; 823 824 if (vp->v_type != VLNK) 825 return (EPERM); 826 827 if (VTOFDESC(vp)->fd_type == Flink) { 828 char *ln = VTOFDESC(vp)->fd_link; 829 error = uiomove(ln, strlen(ln), ap->a_uio); 830 } else { 831 error = EOPNOTSUPP; 832 } 833 834 return (error); 835 } 836 837 int 838 fdesc_read(v) 839 void *v; 840 { 841 struct vop_read_args /* { 842 struct vnode *a_vp; 843 struct uio *a_uio; 844 int a_ioflag; 845 struct ucred *a_cred; 846 } */ *ap = v; 847 int error = EOPNOTSUPP; 848 struct vnode *vp = ap->a_vp; 849 850 switch (VTOFDESC(vp)->fd_type) { 851 case Fctty: 852 VOP_UNLOCK(vp, 0); 853 error = (*ctty_cdevsw.d_read)(devctty, ap->a_uio, ap->a_ioflag); 854 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 855 break; 856 857 default: 858 error = EOPNOTSUPP; 859 break; 860 } 861 862 return (error); 863 } 864 865 int 866 fdesc_write(v) 867 void *v; 868 { 869 struct vop_write_args /* { 870 struct vnode *a_vp; 871 struct uio *a_uio; 872 int a_ioflag; 873 struct ucred *a_cred; 874 } */ *ap = v; 875 int error = EOPNOTSUPP; 876 struct vnode *vp = ap->a_vp; 877 878 switch (VTOFDESC(vp)->fd_type) { 879 case Fctty: 880 VOP_UNLOCK(vp, 0); 881 error = (*ctty_cdevsw.d_write)(devctty, ap->a_uio, 882 ap->a_ioflag); 883 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 884 break; 885 886 default: 887 error = EOPNOTSUPP; 888 break; 889 } 890 891 return (error); 892 } 893 894 int 895 fdesc_ioctl(v) 896 void *v; 897 { 898 struct vop_ioctl_args /* { 899 struct vnode *a_vp; 900 u_long a_command; 901 caddr_t a_data; 902 int a_fflag; 903 struct ucred *a_cred; 904 struct proc *a_p; 905 } */ *ap = v; 906 int error = EOPNOTSUPP; 907 908 switch (VTOFDESC(ap->a_vp)->fd_type) { 909 case Fctty: 910 error = (*ctty_cdevsw.d_ioctl)(devctty, ap->a_command, 911 ap->a_data, ap->a_fflag, 912 ap->a_p); 913 break; 914 915 default: 916 error = EOPNOTSUPP; 917 break; 918 } 919 920 return (error); 921 } 922 923 int 924 fdesc_poll(v) 925 void *v; 926 { 927 struct vop_poll_args /* { 928 struct vnode *a_vp; 929 int a_events; 930 struct proc *a_p; 931 } */ *ap = v; 932 int revents; 933 934 switch (VTOFDESC(ap->a_vp)->fd_type) { 935 case Fctty: 936 revents = (*ctty_cdevsw.d_poll)(devctty, ap->a_events, ap->a_p); 937 break; 938 939 default: 940 revents = genfs_poll(v); 941 break; 942 } 943 944 return (revents); 945 } 946 947 int 948 fdesc_inactive(v) 949 void *v; 950 { 951 struct vop_inactive_args /* { 952 struct vnode *a_vp; 953 struct proc *a_p; 954 } */ *ap = v; 955 struct vnode *vp = ap->a_vp; 956 957 /* 958 * Clear out the v_type field to avoid 959 * nasty things happening in vgone(). 960 */ 961 VOP_UNLOCK(vp, 0); 962 vp->v_type = VNON; 963 return (0); 964 } 965 966 int 967 fdesc_reclaim(v) 968 void *v; 969 { 970 struct vop_reclaim_args /* { 971 struct vnode *a_vp; 972 } */ *ap = v; 973 struct vnode *vp = ap->a_vp; 974 struct fdescnode *fd = VTOFDESC(vp); 975 976 LIST_REMOVE(fd, fd_hash); 977 FREE(vp->v_data, M_TEMP); 978 vp->v_data = 0; 979 980 return (0); 981 } 982 983 /* 984 * Return POSIX pathconf information applicable to special devices. 985 */ 986 int 987 fdesc_pathconf(v) 988 void *v; 989 { 990 struct vop_pathconf_args /* { 991 struct vnode *a_vp; 992 int a_name; 993 register_t *a_retval; 994 } */ *ap = v; 995 996 switch (ap->a_name) { 997 case _PC_LINK_MAX: 998 *ap->a_retval = LINK_MAX; 999 return (0); 1000 case _PC_MAX_CANON: 1001 *ap->a_retval = MAX_CANON; 1002 return (0); 1003 case _PC_MAX_INPUT: 1004 *ap->a_retval = MAX_INPUT; 1005 return (0); 1006 case _PC_PIPE_BUF: 1007 *ap->a_retval = PIPE_BUF; 1008 return (0); 1009 case _PC_CHOWN_RESTRICTED: 1010 *ap->a_retval = 1; 1011 return (0); 1012 case _PC_VDISABLE: 1013 *ap->a_retval = _POSIX_VDISABLE; 1014 return (0); 1015 case _PC_SYNC_IO: 1016 *ap->a_retval = 1; 1017 return (0); 1018 default: 1019 return (EINVAL); 1020 } 1021 /* NOTREACHED */ 1022 } 1023 1024 /* 1025 * Print out the contents of a /dev/fd vnode. 1026 */ 1027 /* ARGSUSED */ 1028 int 1029 fdesc_print(v) 1030 void *v; 1031 { 1032 printf("tag VT_NON, fdesc vnode\n"); 1033 return (0); 1034 } 1035 1036 int 1037 fdesc_link(v) 1038 void *v; 1039 { 1040 struct vop_link_args /* { 1041 struct vnode *a_dvp; 1042 struct vnode *a_vp; 1043 struct componentname *a_cnp; 1044 } */ *ap = v; 1045 1046 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 1047 vput(ap->a_dvp); 1048 return (EROFS); 1049 } 1050 1051 int 1052 fdesc_symlink(v) 1053 void *v; 1054 { 1055 struct vop_symlink_args /* { 1056 struct vnode *a_dvp; 1057 struct vnode **a_vpp; 1058 struct componentname *a_cnp; 1059 struct vattr *a_vap; 1060 char *a_target; 1061 } */ *ap = v; 1062 1063 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 1064 vput(ap->a_dvp); 1065 return (EROFS); 1066 } 1067
Indexes created Wed Oct 22 13:09:56 GMT 2025