1 /* $NetBSD: fdesc_vnops.c,v 1.101 2007/12/08 19:29:50 pooka 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)fdesc_vnops.c 8.17 (Berkeley) 5/22/95 35 * 36 * #Id: fdesc_vnops.c,v 1.12 1993/04/06 16:17:17 jsp Exp # 37 */ 38 39 /* 40 * /dev/fd Filesystem 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: fdesc_vnops.c,v 1.101 2007/12/08 19:29:50 pooka Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/time.h> 49 #include <sys/proc.h> 50 #include <sys/kernel.h> /* boottime */ 51 #include <sys/resourcevar.h> 52 #include <sys/socketvar.h> 53 #include <sys/filedesc.h> 54 #include <sys/vnode.h> 55 #include <sys/malloc.h> 56 #include <sys/conf.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 <sys/tty.h> 64 #include <sys/kauth.h> 65 66 #include <miscfs/fdesc/fdesc.h> 67 #include <miscfs/genfs/genfs.h> 68 69 #define cttyvp(p) ((p)->p_lflag & PL_CONTROLT ? (p)->p_session->s_ttyvp : NULL) 70 71 #define FDL_WANT 0x01 72 #define FDL_LOCKED 0x02 73 static int fdcache_lock; 74 75 dev_t devctty; 76 77 #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1) 78 FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2 79 #endif 80 81 #define NFDCACHE 4 82 83 #define FD_NHASH(ix) \ 84 (&fdhashtbl[(ix) & fdhash]) 85 LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl; 86 u_long fdhash; 87 88 int fdesc_lookup(void *); 89 #define fdesc_create genfs_eopnotsupp 90 #define fdesc_mknod genfs_eopnotsupp 91 int fdesc_open(void *); 92 #define fdesc_close genfs_nullop 93 #define fdesc_access genfs_nullop 94 int fdesc_getattr(void *); 95 int fdesc_setattr(void *); 96 int fdesc_read(void *); 97 int fdesc_write(void *); 98 int fdesc_ioctl(void *); 99 int fdesc_poll(void *); 100 int fdesc_kqfilter(void *); 101 #define fdesc_mmap genfs_eopnotsupp 102 #define fdesc_fcntl genfs_fcntl 103 #define fdesc_fsync genfs_nullop 104 #define fdesc_seek genfs_seek 105 #define fdesc_remove genfs_eopnotsupp 106 int fdesc_link(void *); 107 #define fdesc_rename genfs_eopnotsupp 108 #define fdesc_mkdir genfs_eopnotsupp 109 #define fdesc_rmdir genfs_eopnotsupp 110 int fdesc_symlink(void *); 111 int fdesc_readdir(void *); 112 int fdesc_readlink(void *); 113 #define fdesc_abortop genfs_abortop 114 int fdesc_inactive(void *); 115 int fdesc_reclaim(void *); 116 #define fdesc_lock genfs_lock 117 #define fdesc_unlock genfs_unlock 118 #define fdesc_bmap genfs_badop 119 #define fdesc_strategy genfs_badop 120 int fdesc_print(void *); 121 int fdesc_pathconf(void *); 122 #define fdesc_islocked genfs_islocked 123 #define fdesc_advlock genfs_einval 124 #define fdesc_bwrite genfs_eopnotsupp 125 #define fdesc_revoke genfs_revoke 126 #define fdesc_putpages genfs_null_putpages 127 128 static int fdesc_attr(int, struct vattr *, kauth_cred_t, struct lwp *); 129 130 int (**fdesc_vnodeop_p)(void *); 131 const struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = { 132 { &vop_default_desc, vn_default_error }, 133 { &vop_lookup_desc, fdesc_lookup }, /* lookup */ 134 { &vop_create_desc, fdesc_create }, /* create */ 135 { &vop_mknod_desc, fdesc_mknod }, /* mknod */ 136 { &vop_open_desc, fdesc_open }, /* open */ 137 { &vop_close_desc, fdesc_close }, /* close */ 138 { &vop_access_desc, fdesc_access }, /* access */ 139 { &vop_getattr_desc, fdesc_getattr }, /* getattr */ 140 { &vop_setattr_desc, fdesc_setattr }, /* setattr */ 141 { &vop_read_desc, fdesc_read }, /* read */ 142 { &vop_write_desc, fdesc_write }, /* write */ 143 { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */ 144 { &vop_fcntl_desc, fdesc_fcntl }, /* fcntl */ 145 { &vop_poll_desc, fdesc_poll }, /* poll */ 146 { &vop_kqfilter_desc, fdesc_kqfilter }, /* kqfilter */ 147 { &vop_revoke_desc, fdesc_revoke }, /* revoke */ 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_bwrite_desc, fdesc_bwrite }, /* bwrite */ 171 { &vop_putpages_desc, fdesc_putpages }, /* putpages */ 172 { NULL, NULL } 173 }; 174 175 const struct vnodeopv_desc fdesc_vnodeop_opv_desc = 176 { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; 177 178 extern const struct cdevsw ctty_cdevsw; 179 180 /* 181 * Initialise cache headers 182 */ 183 void 184 fdesc_init() 185 { 186 int cttymajor; 187 188 /* locate the major number */ 189 cttymajor = cdevsw_lookup_major(&ctty_cdevsw); 190 devctty = makedev(cttymajor, 0); 191 fdhashtbl = hashinit(NFDCACHE, HASH_LIST, M_CACHE, M_NOWAIT, &fdhash); 192 } 193 194 /* 195 * Free hash table. 196 */ 197 void 198 fdesc_done() 199 { 200 hashdone(fdhashtbl, M_CACHE); 201 } 202 203 /* 204 * Return a locked vnode of the correct type. 205 */ 206 int 207 fdesc_allocvp(ftype, ix, mp, vpp) 208 fdntype ftype; 209 int ix; 210 struct mount *mp; 211 struct vnode **vpp; 212 { 213 struct fdhashhead *fc; 214 struct fdescnode *fd; 215 int error = 0; 216 217 fc = FD_NHASH(ix); 218 loop: 219 for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) { 220 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) { 221 if (vget(fd->fd_vnode, LK_EXCLUSIVE)) 222 goto loop; 223 *vpp = fd->fd_vnode; 224 return (error); 225 } 226 } 227 228 /* 229 * otherwise lock the array while we call getnewvnode 230 * since that can block. 231 */ 232 if (fdcache_lock & FDL_LOCKED) { 233 fdcache_lock |= FDL_WANT; 234 (void) tsleep(&fdcache_lock, PINOD, "fdcache", 0); 235 goto loop; 236 } 237 fdcache_lock |= FDL_LOCKED; 238 239 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp); 240 if (error) 241 goto out; 242 MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK); 243 (*vpp)->v_data = fd; 244 fd->fd_vnode = *vpp; 245 fd->fd_type = ftype; 246 fd->fd_fd = -1; 247 fd->fd_link = 0; 248 fd->fd_ix = ix; 249 uvm_vnp_setsize(*vpp, 0); 250 VOP_LOCK(*vpp, LK_EXCLUSIVE); 251 LIST_INSERT_HEAD(fc, fd, fd_hash); 252 253 out:; 254 fdcache_lock &= ~FDL_LOCKED; 255 256 if (fdcache_lock & FDL_WANT) { 257 fdcache_lock &= ~FDL_WANT; 258 wakeup(&fdcache_lock); 259 } 260 261 return (error); 262 } 263 264 /* 265 * vp is the current namei directory 266 * ndp is the name to locate in that directory... 267 */ 268 int 269 fdesc_lookup(v) 270 void *v; 271 { 272 struct vop_lookup_args /* { 273 struct vnode * a_dvp; 274 struct vnode ** a_vpp; 275 struct componentname * a_cnp; 276 } */ *ap = v; 277 struct vnode **vpp = ap->a_vpp; 278 struct vnode *dvp = ap->a_dvp; 279 struct componentname *cnp = ap->a_cnp; 280 struct lwp *l = curlwp; 281 const char *pname = cnp->cn_nameptr; 282 struct proc *p = l->l_proc; 283 int numfiles = p->p_fd->fd_nfiles; 284 unsigned fd = 0; 285 int error; 286 struct vnode *fvp; 287 const char *ln; 288 289 if (cnp->cn_namelen == 1 && *pname == '.') { 290 *vpp = dvp; 291 VREF(dvp); 292 return (0); 293 } 294 295 switch (VTOFDESC(dvp)->fd_type) { 296 default: 297 case Flink: 298 case Fdesc: 299 case Fctty: 300 error = ENOTDIR; 301 goto bad; 302 303 case Froot: 304 if (cnp->cn_namelen == 2 && memcmp(pname, "fd", 2) == 0) { 305 error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp); 306 if (error) 307 goto bad; 308 *vpp = fvp; 309 fvp->v_type = VDIR; 310 goto good; 311 } 312 313 if (cnp->cn_namelen == 3 && memcmp(pname, "tty", 3) == 0) { 314 struct vnode *ttyvp = cttyvp(p); 315 if (ttyvp == NULL) { 316 error = ENXIO; 317 goto bad; 318 } 319 error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp); 320 if (error) 321 goto bad; 322 *vpp = fvp; 323 fvp->v_type = VCHR; 324 goto good; 325 } 326 327 ln = 0; 328 switch (cnp->cn_namelen) { 329 case 5: 330 if (memcmp(pname, "stdin", 5) == 0) { 331 ln = "fd/0"; 332 fd = FD_STDIN; 333 } 334 break; 335 case 6: 336 if (memcmp(pname, "stdout", 6) == 0) { 337 ln = "fd/1"; 338 fd = FD_STDOUT; 339 } else 340 if (memcmp(pname, "stderr", 6) == 0) { 341 ln = "fd/2"; 342 fd = FD_STDERR; 343 } 344 break; 345 } 346 347 if (ln) { 348 error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp); 349 if (error) 350 goto bad; 351 /* XXXUNCONST */ 352 VTOFDESC(fvp)->fd_link = __UNCONST(ln); 353 *vpp = fvp; 354 fvp->v_type = VLNK; 355 goto good; 356 } else { 357 error = ENOENT; 358 goto bad; 359 } 360 361 /* FALL THROUGH */ 362 363 case Fdevfd: 364 if (cnp->cn_namelen == 2 && memcmp(pname, "..", 2) == 0) { 365 VOP_UNLOCK(dvp, 0); 366 error = fdesc_root(dvp->v_mount, vpp); 367 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 368 if (error) 369 goto bad; 370 return (error); 371 } 372 373 fd = 0; 374 while (*pname >= '0' && *pname <= '9') { 375 fd = 10 * fd + *pname++ - '0'; 376 if (fd >= numfiles) 377 break; 378 } 379 380 if (*pname != '\0') { 381 error = ENOENT; 382 goto bad; 383 } 384 385 if (fd >= numfiles || p->p_fd->fd_ofiles[fd] == NULL || 386 FILE_IS_USABLE(p->p_fd->fd_ofiles[fd]) == 0) { 387 error = EBADF; 388 goto bad; 389 } 390 391 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp); 392 if (error) 393 goto bad; 394 VTOFDESC(fvp)->fd_fd = fd; 395 *vpp = fvp; 396 goto good; 397 } 398 399 bad: 400 *vpp = NULL; 401 return (error); 402 403 good: 404 return (0); 405 } 406 407 int 408 fdesc_open(v) 409 void *v; 410 { 411 struct vop_open_args /* { 412 struct vnode *a_vp; 413 int a_mode; 414 kauth_cred_t a_cred; 415 } */ *ap = v; 416 struct vnode *vp = ap->a_vp; 417 418 switch (VTOFDESC(vp)->fd_type) { 419 case Fdesc: 420 /* 421 * XXX Kludge: set dupfd to contain the value of the 422 * the file descriptor being sought for duplication. The error 423 * return ensures that the vnode for this device will be 424 * released by vn_open. Open will detect this special error and 425 * take the actions in dupfdopen. Other callers of vn_open or 426 * VOP_OPEN will simply report the error. 427 */ 428 curlwp->l_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */ 429 return EDUPFD; 430 431 case Fctty: 432 return cdev_open(devctty, ap->a_mode, 0, curlwp); 433 case Froot: 434 case Fdevfd: 435 case Flink: 436 break; 437 } 438 439 return (0); 440 } 441 442 static int 443 fdesc_attr(fd, vap, cred, l) 444 int fd; 445 struct vattr *vap; 446 kauth_cred_t cred; 447 struct lwp *l; 448 { 449 struct proc *p = l->l_proc; 450 struct filedesc *fdp = p->p_fd; 451 struct file *fp; 452 struct stat stb; 453 int error; 454 455 if ((fp = fd_getfile(fdp, fd)) == NULL) 456 return (EBADF); 457 458 switch (fp->f_type) { 459 case DTYPE_VNODE: 460 FILE_USE(fp); 461 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred); 462 FILE_UNUSE(fp, l); 463 if (error == 0 && vap->va_type == VDIR) { 464 /* 465 * directories can cause loops in the namespace, 466 * so turn off the 'x' bits to avoid trouble. 467 */ 468 vap->va_mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH); 469 } 470 break; 471 472 default: 473 FILE_USE(fp); 474 memset(&stb, 0, sizeof(stb)); 475 error = (*fp->f_ops->fo_stat)(fp, &stb, l); 476 FILE_UNUSE(fp, l); 477 if (error) 478 break; 479 480 vattr_null(vap); 481 switch(fp->f_type) { 482 case DTYPE_SOCKET: 483 vap->va_type = VSOCK; 484 break; 485 case DTYPE_PIPE: 486 vap->va_type = VFIFO; 487 break; 488 default: 489 /* use VNON perhaps? */ 490 vap->va_type = VBAD; 491 break; 492 } 493 vap->va_mode = stb.st_mode; 494 vap->va_nlink = stb.st_nlink; 495 vap->va_uid = stb.st_uid; 496 vap->va_gid = stb.st_gid; 497 vap->va_fsid = stb.st_dev; 498 vap->va_fileid = stb.st_ino; 499 vap->va_size = stb.st_size; 500 vap->va_blocksize = stb.st_blksize; 501 vap->va_atime = stb.st_atimespec; 502 vap->va_mtime = stb.st_mtimespec; 503 vap->va_ctime = stb.st_ctimespec; 504 vap->va_gen = stb.st_gen; 505 vap->va_flags = stb.st_flags; 506 vap->va_rdev = stb.st_rdev; 507 vap->va_bytes = stb.st_blocks * stb.st_blksize; 508 break; 509 } 510 511 return (error); 512 } 513 514 int 515 fdesc_getattr(v) 516 void *v; 517 { 518 struct vop_getattr_args /* { 519 struct vnode *a_vp; 520 struct vattr *a_vap; 521 kauth_cred_t a_cred; 522 struct lwp *a_l; 523 } */ *ap = v; 524 struct vnode *vp = ap->a_vp; 525 struct vattr *vap = ap->a_vap; 526 unsigned fd; 527 int error = 0; 528 529 switch (VTOFDESC(vp)->fd_type) { 530 case Froot: 531 case Fdevfd: 532 case Flink: 533 case Fctty: 534 VATTR_NULL(vap); 535 vap->va_fileid = VTOFDESC(vp)->fd_ix; 536 537 #define R_ALL (S_IRUSR|S_IRGRP|S_IROTH) 538 #define W_ALL (S_IWUSR|S_IWGRP|S_IWOTH) 539 #define X_ALL (S_IXUSR|S_IXGRP|S_IXOTH) 540 541 switch (VTOFDESC(vp)->fd_type) { 542 case Flink: 543 vap->va_mode = R_ALL|X_ALL; 544 vap->va_type = VLNK; 545 vap->va_rdev = 0; 546 vap->va_nlink = 1; 547 vap->va_size = strlen(VTOFDESC(vp)->fd_link); 548 break; 549 550 case Fctty: 551 vap->va_mode = R_ALL|W_ALL; 552 vap->va_type = VCHR; 553 vap->va_rdev = devctty; 554 vap->va_nlink = 1; 555 vap->va_size = 0; 556 break; 557 558 default: 559 vap->va_mode = R_ALL|X_ALL; 560 vap->va_type = VDIR; 561 vap->va_rdev = 0; 562 vap->va_nlink = 2; 563 vap->va_size = DEV_BSIZE; 564 break; 565 } 566 vap->va_uid = 0; 567 vap->va_gid = 0; 568 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 569 vap->va_blocksize = DEV_BSIZE; 570 vap->va_atime.tv_sec = boottime.tv_sec; 571 vap->va_atime.tv_nsec = 0; 572 vap->va_mtime = vap->va_atime; 573 vap->va_ctime = vap->va_mtime; 574 vap->va_gen = 0; 575 vap->va_flags = 0; 576 vap->va_bytes = 0; 577 break; 578 579 case Fdesc: 580 fd = VTOFDESC(vp)->fd_fd; 581 error = fdesc_attr(fd, vap, ap->a_cred, curlwp); 582 break; 583 584 default: 585 panic("fdesc_getattr"); 586 break; 587 } 588 589 if (error == 0) 590 vp->v_type = vap->va_type; 591 592 return (error); 593 } 594 595 int 596 fdesc_setattr(v) 597 void *v; 598 { 599 struct vop_setattr_args /* { 600 struct vnode *a_vp; 601 struct vattr *a_vap; 602 kauth_cred_t a_cred; 603 } */ *ap = v; 604 struct filedesc *fdp = curlwp->l_proc->p_fd; 605 struct file *fp; 606 unsigned fd; 607 608 /* 609 * Can't mess with the root vnode 610 */ 611 switch (VTOFDESC(ap->a_vp)->fd_type) { 612 case Fdesc: 613 break; 614 615 case Fctty: 616 return (0); 617 618 default: 619 return (EACCES); 620 } 621 622 fd = VTOFDESC(ap->a_vp)->fd_fd; 623 if ((fp = fd_getfile(fdp, fd)) == NULL) 624 return (EBADF); 625 626 /* 627 * XXX: Can't reasonably set the attr's on any types currently. 628 * On vnode's this will cause truncation and socket/pipes make 629 * no sense. 630 */ 631 mutex_exit(&fp->f_lock); 632 return (0); 633 } 634 635 636 struct fdesc_target { 637 ino_t ft_fileno; 638 u_char ft_type; 639 u_char ft_namlen; 640 const char *ft_name; 641 } fdesc_targets[] = { 642 #define N(s) sizeof(s)-1, s 643 { FD_DEVFD, DT_DIR, N("fd") }, 644 { FD_STDIN, DT_LNK, N("stdin") }, 645 { FD_STDOUT, DT_LNK, N("stdout") }, 646 { FD_STDERR, DT_LNK, N("stderr") }, 647 { FD_CTTY, DT_UNKNOWN, N("tty") }, 648 #undef N 649 #define UIO_MX _DIRENT_RECLEN((struct dirent *)NULL, sizeof("stderr") - 1) 650 }; 651 static int nfdesc_targets = sizeof(fdesc_targets) / sizeof(fdesc_targets[0]); 652 653 int 654 fdesc_readdir(v) 655 void *v; 656 { 657 struct vop_readdir_args /* { 658 struct vnode *a_vp; 659 struct uio *a_uio; 660 kauth_cred_t a_cred; 661 int *a_eofflag; 662 off_t **a_cookies; 663 int *a_ncookies; 664 } */ *ap = v; 665 struct uio *uio = ap->a_uio; 666 struct dirent d; 667 struct filedesc *fdp; 668 off_t i; 669 int j; 670 int error; 671 off_t *cookies = NULL; 672 int ncookies; 673 674 switch (VTOFDESC(ap->a_vp)->fd_type) { 675 case Fctty: 676 return 0; 677 678 case Fdesc: 679 return ENOTDIR; 680 681 default: 682 break; 683 } 684 685 fdp = curproc->p_fd; 686 687 if (uio->uio_resid < UIO_MX) 688 return EINVAL; 689 if (uio->uio_offset < 0) 690 return EINVAL; 691 692 error = 0; 693 i = uio->uio_offset; 694 (void)memset(&d, 0, UIO_MX); 695 d.d_reclen = UIO_MX; 696 if (ap->a_ncookies) 697 ncookies = uio->uio_resid / UIO_MX; 698 else 699 ncookies = 0; 700 701 if (VTOFDESC(ap->a_vp)->fd_type == Froot) { 702 struct fdesc_target *ft; 703 704 if (i >= nfdesc_targets) 705 return 0; 706 707 if (ap->a_ncookies) { 708 ncookies = min(ncookies, (nfdesc_targets - i)); 709 cookies = malloc(ncookies * sizeof(off_t), 710 M_TEMP, M_WAITOK); 711 *ap->a_cookies = cookies; 712 *ap->a_ncookies = ncookies; 713 } 714 715 for (ft = &fdesc_targets[i]; uio->uio_resid >= UIO_MX && 716 i < nfdesc_targets; ft++, i++) { 717 switch (ft->ft_fileno) { 718 case FD_CTTY: 719 if (cttyvp(curproc) == NULL) 720 continue; 721 break; 722 723 case FD_STDIN: 724 case FD_STDOUT: 725 case FD_STDERR: 726 if (fdp == NULL) 727 continue; 728 if ((ft->ft_fileno - FD_STDIN) >= 729 fdp->fd_nfiles) 730 continue; 731 if (fdp->fd_ofiles[ft->ft_fileno - FD_STDIN] 732 == NULL 733 || FILE_IS_USABLE( 734 fdp->fd_ofiles[ft->ft_fileno - FD_STDIN]) 735 == 0) 736 continue; 737 break; 738 } 739 740 d.d_fileno = ft->ft_fileno; 741 d.d_namlen = ft->ft_namlen; 742 (void)memcpy(d.d_name, ft->ft_name, ft->ft_namlen + 1); 743 d.d_type = ft->ft_type; 744 745 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 746 break; 747 if (cookies) 748 *cookies++ = i + 1; 749 } 750 } else { 751 int nfdp = fdp ? fdp->fd_nfiles : 0; 752 if (ap->a_ncookies) { 753 ncookies = min(ncookies, nfdp + 2); 754 cookies = malloc(ncookies * sizeof(off_t), 755 M_TEMP, M_WAITOK); 756 *ap->a_cookies = cookies; 757 *ap->a_ncookies = ncookies; 758 } 759 for (; i - 2 < nfdp && uio->uio_resid >= UIO_MX; i++) { 760 switch (i) { 761 case 0: 762 case 1: 763 d.d_fileno = FD_ROOT; /* XXX */ 764 d.d_namlen = i + 1; 765 (void)memcpy(d.d_name, "..", d.d_namlen); 766 d.d_name[i + 1] = '\0'; 767 d.d_type = DT_DIR; 768 break; 769 770 default: 771 KASSERT(fdp != NULL); 772 j = (int)i - 2; 773 if (fdp == NULL || fdp->fd_ofiles[j] == NULL || 774 FILE_IS_USABLE(fdp->fd_ofiles[j]) == 0) 775 continue; 776 d.d_fileno = j + FD_STDIN; 777 d.d_namlen = sprintf(d.d_name, "%d", j); 778 d.d_type = DT_UNKNOWN; 779 break; 780 } 781 782 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 783 break; 784 if (cookies) 785 *cookies++ = i + 1; 786 } 787 } 788 789 if (ap->a_ncookies && error) { 790 free(*ap->a_cookies, M_TEMP); 791 *ap->a_ncookies = 0; 792 *ap->a_cookies = NULL; 793 } 794 795 uio->uio_offset = i; 796 return error; 797 } 798 799 int 800 fdesc_readlink(v) 801 void *v; 802 { 803 struct vop_readlink_args /* { 804 struct vnode *a_vp; 805 struct uio *a_uio; 806 kauth_cred_t a_cred; 807 } */ *ap = v; 808 struct vnode *vp = ap->a_vp; 809 int error; 810 811 if (vp->v_type != VLNK) 812 return (EPERM); 813 814 if (VTOFDESC(vp)->fd_type == Flink) { 815 char *ln = VTOFDESC(vp)->fd_link; 816 error = uiomove(ln, strlen(ln), ap->a_uio); 817 } else { 818 error = EOPNOTSUPP; 819 } 820 821 return (error); 822 } 823 824 int 825 fdesc_read(v) 826 void *v; 827 { 828 struct vop_read_args /* { 829 struct vnode *a_vp; 830 struct uio *a_uio; 831 int a_ioflag; 832 kauth_cred_t a_cred; 833 } */ *ap = v; 834 int error = EOPNOTSUPP; 835 struct vnode *vp = ap->a_vp; 836 837 switch (VTOFDESC(vp)->fd_type) { 838 case Fctty: 839 VOP_UNLOCK(vp, 0); 840 error = cdev_read(devctty, ap->a_uio, ap->a_ioflag); 841 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 842 break; 843 844 default: 845 error = EOPNOTSUPP; 846 break; 847 } 848 849 return (error); 850 } 851 852 int 853 fdesc_write(v) 854 void *v; 855 { 856 struct vop_write_args /* { 857 struct vnode *a_vp; 858 struct uio *a_uio; 859 int a_ioflag; 860 kauth_cred_t a_cred; 861 } */ *ap = v; 862 int error = EOPNOTSUPP; 863 struct vnode *vp = ap->a_vp; 864 865 switch (VTOFDESC(vp)->fd_type) { 866 case Fctty: 867 VOP_UNLOCK(vp, 0); 868 error = cdev_write(devctty, ap->a_uio, ap->a_ioflag); 869 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 870 break; 871 872 default: 873 error = EOPNOTSUPP; 874 break; 875 } 876 877 return (error); 878 } 879 880 int 881 fdesc_ioctl(v) 882 void *v; 883 { 884 struct vop_ioctl_args /* { 885 struct vnode *a_vp; 886 u_long a_command; 887 void *a_data; 888 int a_fflag; 889 kauth_cred_t a_cred; 890 } */ *ap = v; 891 int error = EOPNOTSUPP; 892 893 switch (VTOFDESC(ap->a_vp)->fd_type) { 894 case Fctty: 895 error = cdev_ioctl(devctty, ap->a_command, ap->a_data, 896 ap->a_fflag, curlwp); 897 break; 898 899 default: 900 error = EOPNOTSUPP; 901 break; 902 } 903 904 return (error); 905 } 906 907 int 908 fdesc_poll(v) 909 void *v; 910 { 911 struct vop_poll_args /* { 912 struct vnode *a_vp; 913 int a_events; 914 } */ *ap = v; 915 int revents; 916 917 switch (VTOFDESC(ap->a_vp)->fd_type) { 918 case Fctty: 919 revents = cdev_poll(devctty, ap->a_events, curlwp); 920 break; 921 922 default: 923 revents = genfs_poll(v); 924 break; 925 } 926 927 return (revents); 928 } 929 930 int 931 fdesc_kqfilter(v) 932 void *v; 933 { 934 struct vop_kqfilter_args /* { 935 struct vnode *a_vp; 936 struct knote *a_kn; 937 } */ *ap = v; 938 int error; 939 struct proc *p; 940 struct lwp *l; 941 struct file *fp; 942 943 switch (VTOFDESC(ap->a_vp)->fd_type) { 944 case Fctty: 945 error = cdev_kqfilter(devctty, ap->a_kn); 946 break; 947 948 case Fdesc: 949 /* just invoke kqfilter for the underlying descriptor */ 950 l = curlwp; /* XXX hopefully ok to use curproc here */ 951 p = l->l_proc; 952 if ((fp = fd_getfile(p->p_fd, VTOFDESC(ap->a_vp)->fd_fd)) == NULL) 953 return (1); 954 955 FILE_USE(fp); 956 error = (*fp->f_ops->fo_kqfilter)(fp, ap->a_kn); 957 FILE_UNUSE(fp, l); 958 break; 959 960 default: 961 return (genfs_kqfilter(v)); 962 } 963 964 return (error); 965 } 966 967 int 968 fdesc_inactive(v) 969 void *v; 970 { 971 struct vop_inactive_args /* { 972 struct vnode *a_vp; 973 } */ *ap = v; 974 struct vnode *vp = ap->a_vp; 975 976 /* 977 * Clear out the v_type field to avoid 978 * nasty things happening in vgone(). 979 */ 980 VOP_UNLOCK(vp, 0); 981 vp->v_type = VNON; 982 return (0); 983 } 984 985 int 986 fdesc_reclaim(v) 987 void *v; 988 { 989 struct vop_reclaim_args /* { 990 struct vnode *a_vp; 991 } */ *ap = v; 992 struct vnode *vp = ap->a_vp; 993 struct fdescnode *fd = VTOFDESC(vp); 994 995 LIST_REMOVE(fd, fd_hash); 996 FREE(vp->v_data, M_TEMP); 997 vp->v_data = 0; 998 999 return (0); 1000 } 1001 1002 /* 1003 * Return POSIX pathconf information applicable to special devices. 1004 */ 1005 int 1006 fdesc_pathconf(v) 1007 void *v; 1008 { 1009 struct vop_pathconf_args /* { 1010 struct vnode *a_vp; 1011 int a_name; 1012 register_t *a_retval; 1013 } */ *ap = v; 1014 1015 switch (ap->a_name) { 1016 case _PC_LINK_MAX: 1017 *ap->a_retval = LINK_MAX; 1018 return (0); 1019 case _PC_MAX_CANON: 1020 *ap->a_retval = MAX_CANON; 1021 return (0); 1022 case _PC_MAX_INPUT: 1023 *ap->a_retval = MAX_INPUT; 1024 return (0); 1025 case _PC_PIPE_BUF: 1026 *ap->a_retval = PIPE_BUF; 1027 return (0); 1028 case _PC_CHOWN_RESTRICTED: 1029 *ap->a_retval = 1; 1030 return (0); 1031 case _PC_VDISABLE: 1032 *ap->a_retval = _POSIX_VDISABLE; 1033 return (0); 1034 case _PC_SYNC_IO: 1035 *ap->a_retval = 1; 1036 return (0); 1037 default: 1038 return (EINVAL); 1039 } 1040 /* NOTREACHED */ 1041 } 1042 1043 /* 1044 * Print out the contents of a /dev/fd vnode. 1045 */ 1046 /* ARGSUSED */ 1047 int 1048 fdesc_print(void *v) 1049 { 1050 printf("tag VT_NON, fdesc vnode\n"); 1051 return (0); 1052 } 1053 1054 int 1055 fdesc_link(v) 1056 void *v; 1057 { 1058 struct vop_link_args /* { 1059 struct vnode *a_dvp; 1060 struct vnode *a_vp; 1061 struct componentname *a_cnp; 1062 } */ *ap = v; 1063 1064 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 1065 vput(ap->a_dvp); 1066 return (EROFS); 1067 } 1068 1069 int 1070 fdesc_symlink(v) 1071 void *v; 1072 { 1073 struct vop_symlink_args /* { 1074 struct vnode *a_dvp; 1075 struct vnode **a_vpp; 1076 struct componentname *a_cnp; 1077 struct vattr *a_vap; 1078 char *a_target; 1079 } */ *ap = v; 1080 1081 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 1082 vput(ap->a_dvp); 1083 return (EROFS); 1084 } 1085