fdesc_vnops.c revision 1.137
1 /* $NetBSD: fdesc_vnops.c,v 1.137 2021/06/29 22:34:08 dholland 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 1.137 2021/06/29 22:34:08 dholland 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/resourcevar.h> 51 #include <sys/socketvar.h> 52 #include <sys/filedesc.h> 53 #include <sys/vnode.h> 54 #include <sys/malloc.h> 55 #include <sys/conf.h> 56 #include <sys/file.h> 57 #include <sys/stat.h> 58 #include <sys/mount.h> 59 #include <sys/namei.h> 60 #include <sys/buf.h> 61 #include <sys/dirent.h> 62 #include <sys/tty.h> 63 #include <sys/kauth.h> 64 #include <sys/atomic.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 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 int fdesc_lookup(void *); 78 #define fdesc_create genfs_eopnotsupp 79 #define fdesc_mknod genfs_eopnotsupp 80 int fdesc_open(void *); 81 #define fdesc_close genfs_nullop 82 #define fdesc_access genfs_nullop 83 int fdesc_getattr(void *); 84 int fdesc_setattr(void *); 85 int fdesc_read(void *); 86 int fdesc_write(void *); 87 int fdesc_ioctl(void *); 88 int fdesc_poll(void *); 89 int fdesc_kqfilter(void *); 90 #define fdesc_mmap genfs_eopnotsupp 91 #define fdesc_fcntl genfs_fcntl 92 #define fdesc_fsync genfs_nullop 93 #define fdesc_seek genfs_seek 94 #define fdesc_remove genfs_eopnotsupp 95 int fdesc_link(void *); 96 #define fdesc_rename genfs_eopnotsupp 97 #define fdesc_mkdir genfs_eopnotsupp 98 #define fdesc_rmdir genfs_eopnotsupp 99 int fdesc_symlink(void *); 100 int fdesc_readdir(void *); 101 int fdesc_readlink(void *); 102 #define fdesc_abortop genfs_abortop 103 int fdesc_inactive(void *); 104 int fdesc_reclaim(void *); 105 #define fdesc_lock genfs_lock 106 #define fdesc_unlock genfs_unlock 107 #define fdesc_bmap genfs_eopnotsupp 108 #define fdesc_strategy genfs_badop 109 int fdesc_print(void *); 110 int fdesc_pathconf(void *); 111 #define fdesc_islocked genfs_islocked 112 #define fdesc_advlock genfs_einval 113 #define fdesc_bwrite genfs_eopnotsupp 114 #define fdesc_revoke genfs_revoke 115 #define fdesc_putpages genfs_null_putpages 116 117 static int fdesc_attr(int, struct vattr *, kauth_cred_t); 118 119 int (**fdesc_vnodeop_p)(void *); 120 const struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = { 121 { &vop_default_desc, vn_default_error }, 122 { &vop_parsepath_desc, genfs_parsepath }, /* parsepath */ 123 { &vop_lookup_desc, fdesc_lookup }, /* lookup */ 124 { &vop_create_desc, fdesc_create }, /* create */ 125 { &vop_mknod_desc, fdesc_mknod }, /* mknod */ 126 { &vop_open_desc, fdesc_open }, /* open */ 127 { &vop_close_desc, fdesc_close }, /* close */ 128 { &vop_access_desc, fdesc_access }, /* access */ 129 { &vop_accessx_desc, genfs_accessx }, /* accessx */ 130 { &vop_getattr_desc, fdesc_getattr }, /* getattr */ 131 { &vop_setattr_desc, fdesc_setattr }, /* setattr */ 132 { &vop_read_desc, fdesc_read }, /* read */ 133 { &vop_write_desc, fdesc_write }, /* write */ 134 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ 135 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ 136 { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */ 137 { &vop_fcntl_desc, fdesc_fcntl }, /* fcntl */ 138 { &vop_poll_desc, fdesc_poll }, /* poll */ 139 { &vop_kqfilter_desc, fdesc_kqfilter }, /* kqfilter */ 140 { &vop_revoke_desc, fdesc_revoke }, /* revoke */ 141 { &vop_mmap_desc, fdesc_mmap }, /* mmap */ 142 { &vop_fsync_desc, fdesc_fsync }, /* fsync */ 143 { &vop_seek_desc, fdesc_seek }, /* seek */ 144 { &vop_remove_desc, fdesc_remove }, /* remove */ 145 { &vop_link_desc, fdesc_link }, /* link */ 146 { &vop_rename_desc, fdesc_rename }, /* rename */ 147 { &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */ 148 { &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */ 149 { &vop_symlink_desc, fdesc_symlink }, /* symlink */ 150 { &vop_readdir_desc, fdesc_readdir }, /* readdir */ 151 { &vop_readlink_desc, fdesc_readlink }, /* readlink */ 152 { &vop_abortop_desc, fdesc_abortop }, /* abortop */ 153 { &vop_inactive_desc, fdesc_inactive }, /* inactive */ 154 { &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */ 155 { &vop_lock_desc, fdesc_lock }, /* lock */ 156 { &vop_unlock_desc, fdesc_unlock }, /* unlock */ 157 { &vop_bmap_desc, fdesc_bmap }, /* bmap */ 158 { &vop_strategy_desc, fdesc_strategy }, /* strategy */ 159 { &vop_print_desc, fdesc_print }, /* print */ 160 { &vop_islocked_desc, fdesc_islocked }, /* islocked */ 161 { &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */ 162 { &vop_advlock_desc, fdesc_advlock }, /* advlock */ 163 { &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */ 164 { &vop_putpages_desc, fdesc_putpages }, /* putpages */ 165 { NULL, NULL } 166 }; 167 168 const struct vnodeopv_desc fdesc_vnodeop_opv_desc = 169 { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; 170 171 /* 172 * Initialise cache headers 173 */ 174 void 175 fdesc_init(void) 176 { 177 int cttymajor; 178 179 /* locate the major number */ 180 cttymajor = devsw_name2chr("ctty", NULL, 0); 181 devctty = makedev(cttymajor, 0); 182 } 183 184 void 185 fdesc_done(void) 186 { 187 } 188 189 /* 190 * vp is the current namei directory 191 * ndp is the name to locate in that directory... 192 */ 193 int 194 fdesc_lookup(void *v) 195 { 196 struct vop_lookup_v2_args /* { 197 struct vnode * a_dvp; 198 struct vnode ** a_vpp; 199 struct componentname * a_cnp; 200 } */ *ap = v; 201 struct vnode **vpp = ap->a_vpp; 202 struct vnode *dvp = ap->a_dvp; 203 struct componentname *cnp = ap->a_cnp; 204 struct lwp *l = curlwp; 205 const char *pname = cnp->cn_nameptr; 206 struct proc *p = l->l_proc; 207 unsigned fd = 0; 208 int error, ix = -1; 209 fdtab_t *dt; 210 211 dt = atomic_load_consume(&curlwp->l_fd->fd_dt); 212 213 if (cnp->cn_namelen == 1 && *pname == '.') { 214 *vpp = dvp; 215 vref(dvp); 216 return (0); 217 } 218 219 switch (VTOFDESC(dvp)->fd_type) { 220 default: 221 case Flink: 222 case Fdesc: 223 case Fctty: 224 error = ENOTDIR; 225 goto bad; 226 227 case Froot: 228 if (cnp->cn_namelen == 2 && memcmp(pname, "fd", 2) == 0) { 229 ix = FD_DEVFD; 230 goto good; 231 } 232 233 if (cnp->cn_namelen == 3 && memcmp(pname, "tty", 3) == 0) { 234 struct vnode *ttyvp = cttyvp(p); 235 if (ttyvp == NULL) { 236 error = ENXIO; 237 goto bad; 238 } 239 ix = FD_CTTY; 240 goto good; 241 } 242 243 switch (cnp->cn_namelen) { 244 case 5: 245 if (memcmp(pname, "stdin", 5) == 0) { 246 ix = FD_STDIN; 247 goto good; 248 } 249 break; 250 case 6: 251 if (memcmp(pname, "stdout", 6) == 0) { 252 ix = FD_STDOUT; 253 goto good; 254 } else if (memcmp(pname, "stderr", 6) == 0) { 255 ix = FD_STDERR; 256 goto good; 257 } 258 break; 259 } 260 261 error = ENOENT; 262 goto bad; 263 264 case Fdevfd: 265 if (cnp->cn_namelen == 2 && memcmp(pname, "..", 2) == 0) { 266 ix = FD_ROOT; 267 goto good; 268 } 269 270 fd = 0; 271 while (*pname >= '0' && *pname <= '9') { 272 fd = 10 * fd + *pname++ - '0'; 273 if (fd >= dt->dt_nfiles) 274 break; 275 } 276 277 if (*pname != '\0') { 278 error = ENOENT; 279 goto bad; 280 } 281 282 if (fd >= dt->dt_nfiles || dt->dt_ff[fd] == NULL || 283 dt->dt_ff[fd]->ff_file == NULL) { 284 error = EBADF; 285 goto bad; 286 } 287 288 ix = FD_DESC + fd; 289 goto good; 290 } 291 292 bad: 293 *vpp = NULL; 294 return error; 295 296 good: 297 KASSERT(ix != -1); 298 error = vcache_get(dvp->v_mount, &ix, sizeof(ix), vpp); 299 if (error) 300 return error; 301 302 /* 303 * Prevent returning VNON nodes. 304 * Operation fdesc_inactive() will reset the type to VNON. 305 */ 306 if (ix == FD_CTTY) 307 (*vpp)->v_type = VCHR; 308 else if (ix >= FD_DESC) 309 (*vpp)->v_type = VREG; 310 KASSERT((*vpp)->v_type != VNON); 311 312 return 0; 313 } 314 315 int 316 fdesc_open(void *v) 317 { 318 struct vop_open_args /* { 319 struct vnode *a_vp; 320 int a_mode; 321 kauth_cred_t a_cred; 322 } */ *ap = v; 323 struct vnode *vp = ap->a_vp; 324 325 switch (VTOFDESC(vp)->fd_type) { 326 case Fdesc: 327 /* 328 * XXX Kludge: set dupfd to contain the value of the 329 * the file descriptor being sought for duplication. The error 330 * return ensures that the vnode for this device will be 331 * released by vn_open. Open will detect this special error and 332 * take the actions in dupfdopen. Other callers of vn_open or 333 * VOP_OPEN will simply report the error. 334 */ 335 curlwp->l_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */ 336 return EDUPFD; 337 338 case Fctty: 339 return cdev_open(devctty, ap->a_mode, 0, curlwp); 340 case Froot: 341 case Fdevfd: 342 case Flink: 343 break; 344 } 345 346 return (0); 347 } 348 349 static int 350 fdesc_attr(int fd, struct vattr *vap, kauth_cred_t cred) 351 { 352 file_t *fp; 353 struct stat stb; 354 int error; 355 356 if ((fp = fd_getfile(fd)) == NULL) 357 return (EBADF); 358 359 switch (fp->f_type) { 360 case DTYPE_VNODE: 361 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 362 error = VOP_GETATTR(fp->f_vnode, vap, cred); 363 VOP_UNLOCK(fp->f_vnode); 364 if (error == 0 && vap->va_type == VDIR) { 365 /* 366 * directories can cause loops in the namespace, 367 * so turn off the 'x' bits to avoid trouble. 368 */ 369 vap->va_mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH); 370 } 371 break; 372 373 default: 374 memset(&stb, 0, sizeof(stb)); 375 error = (*fp->f_ops->fo_stat)(fp, &stb); 376 if (error) 377 break; 378 379 vattr_null(vap); 380 switch(fp->f_type) { 381 case DTYPE_SOCKET: 382 vap->va_type = VSOCK; 383 break; 384 case DTYPE_PIPE: 385 vap->va_type = VFIFO; 386 break; 387 default: 388 /* use VNON perhaps? */ 389 vap->va_type = VBAD; 390 break; 391 } 392 vap->va_mode = stb.st_mode; 393 vap->va_nlink = stb.st_nlink; 394 vap->va_uid = stb.st_uid; 395 vap->va_gid = stb.st_gid; 396 vap->va_fsid = stb.st_dev; 397 vap->va_fileid = stb.st_ino; 398 vap->va_size = stb.st_size; 399 vap->va_blocksize = stb.st_blksize; 400 vap->va_atime = stb.st_atimespec; 401 vap->va_mtime = stb.st_mtimespec; 402 vap->va_ctime = stb.st_ctimespec; 403 vap->va_gen = stb.st_gen; 404 vap->va_flags = stb.st_flags; 405 vap->va_rdev = stb.st_rdev; 406 vap->va_bytes = stb.st_blocks * stb.st_blksize; 407 break; 408 } 409 410 fd_putfile(fd); 411 return (error); 412 } 413 414 int 415 fdesc_getattr(void *v) 416 { 417 struct vop_getattr_args /* { 418 struct vnode *a_vp; 419 struct vattr *a_vap; 420 kauth_cred_t a_cred; 421 struct lwp *a_l; 422 } */ *ap = v; 423 struct vnode *vp = ap->a_vp; 424 struct vattr *vap = ap->a_vap; 425 unsigned fd; 426 int error = 0; 427 struct timeval tv; 428 429 switch (VTOFDESC(vp)->fd_type) { 430 case Froot: 431 case Fdevfd: 432 case Flink: 433 case Fctty: 434 vattr_null(vap); 435 vap->va_fileid = VTOFDESC(vp)->fd_ix; 436 437 #define R_ALL (S_IRUSR|S_IRGRP|S_IROTH) 438 #define W_ALL (S_IWUSR|S_IWGRP|S_IWOTH) 439 #define X_ALL (S_IXUSR|S_IXGRP|S_IXOTH) 440 441 switch (VTOFDESC(vp)->fd_type) { 442 case Flink: 443 vap->va_mode = R_ALL|X_ALL; 444 vap->va_type = VLNK; 445 vap->va_rdev = 0; 446 vap->va_nlink = 1; 447 vap->va_size = strlen(VTOFDESC(vp)->fd_link); 448 break; 449 450 case Fctty: 451 vap->va_mode = R_ALL|W_ALL; 452 vap->va_type = VCHR; 453 vap->va_rdev = devctty; 454 vap->va_nlink = 1; 455 vap->va_size = 0; 456 break; 457 458 default: 459 vap->va_mode = R_ALL|X_ALL; 460 vap->va_type = VDIR; 461 vap->va_rdev = 0; 462 vap->va_nlink = 2; 463 vap->va_size = DEV_BSIZE; 464 break; 465 } 466 vap->va_uid = 0; 467 vap->va_gid = 0; 468 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 469 vap->va_blocksize = DEV_BSIZE; 470 getmicroboottime(&tv); 471 vap->va_atime.tv_sec = tv.tv_sec; 472 vap->va_atime.tv_nsec = 0; 473 vap->va_mtime = vap->va_atime; 474 vap->va_ctime = vap->va_mtime; 475 vap->va_gen = 0; 476 vap->va_flags = 0; 477 vap->va_bytes = 0; 478 break; 479 480 case Fdesc: 481 fd = VTOFDESC(vp)->fd_fd; 482 error = fdesc_attr(fd, vap, ap->a_cred); 483 break; 484 485 default: 486 panic("fdesc_getattr"); 487 break; 488 } 489 490 if (error == 0) 491 vp->v_type = vap->va_type; 492 493 return (error); 494 } 495 496 int 497 fdesc_setattr(void *v) 498 { 499 struct vop_setattr_args /* { 500 struct vnode *a_vp; 501 struct vattr *a_vap; 502 kauth_cred_t a_cred; 503 } */ *ap = v; 504 file_t *fp; 505 unsigned fd; 506 507 /* 508 * Can't mess with the root vnode 509 */ 510 switch (VTOFDESC(ap->a_vp)->fd_type) { 511 case Fdesc: 512 break; 513 514 case Fctty: 515 return (0); 516 517 default: 518 return (EACCES); 519 } 520 521 fd = VTOFDESC(ap->a_vp)->fd_fd; 522 if ((fp = fd_getfile(fd)) == NULL) 523 return (EBADF); 524 525 /* 526 * XXX: Can't reasonably set the attr's on any types currently. 527 * On vnode's this will cause truncation and socket/pipes make 528 * no sense. 529 */ 530 fd_putfile(fd); 531 return (0); 532 } 533 534 535 struct fdesc_target { 536 ino_t ft_fileno; 537 u_char ft_type; 538 u_char ft_namlen; 539 const char *ft_name; 540 } fdesc_targets[] = { 541 #define N(s) sizeof(s)-1, s 542 { FD_DEVFD, DT_DIR, N("fd") }, 543 { FD_STDIN, DT_LNK, N("stdin") }, 544 { FD_STDOUT, DT_LNK, N("stdout") }, 545 { FD_STDERR, DT_LNK, N("stderr") }, 546 { FD_CTTY, DT_UNKNOWN, N("tty") }, 547 #undef N 548 #define UIO_MX _DIRENT_RECLEN((struct dirent *)NULL, sizeof("stderr") - 1) 549 }; 550 static int nfdesc_targets = sizeof(fdesc_targets) / sizeof(fdesc_targets[0]); 551 552 int 553 fdesc_readdir(void *v) 554 { 555 struct vop_readdir_args /* { 556 struct vnode *a_vp; 557 struct uio *a_uio; 558 kauth_cred_t a_cred; 559 int *a_eofflag; 560 off_t **a_cookies; 561 int *a_ncookies; 562 } */ *ap = v; 563 struct uio *uio = ap->a_uio; 564 struct dirent d; 565 off_t i; 566 int j; 567 int error; 568 off_t *cookies = NULL; 569 int ncookies; 570 fdtab_t *dt; 571 572 switch (VTOFDESC(ap->a_vp)->fd_type) { 573 case Fctty: 574 return 0; 575 576 case Fdesc: 577 return ENOTDIR; 578 579 default: 580 break; 581 } 582 583 dt = atomic_load_consume(&curlwp->l_fd->fd_dt); 584 585 if (uio->uio_resid < UIO_MX) 586 return EINVAL; 587 if (uio->uio_offset < 0) 588 return EINVAL; 589 590 error = 0; 591 i = uio->uio_offset; 592 (void)memset(&d, 0, UIO_MX); 593 d.d_reclen = UIO_MX; 594 if (ap->a_ncookies) 595 ncookies = uio->uio_resid / UIO_MX; 596 else 597 ncookies = 0; 598 599 if (VTOFDESC(ap->a_vp)->fd_type == Froot) { 600 struct fdesc_target *ft; 601 602 if (i >= nfdesc_targets) 603 return 0; 604 605 if (ap->a_ncookies) { 606 ncookies = uimin(ncookies, (nfdesc_targets - i)); 607 cookies = malloc(ncookies * sizeof(off_t), 608 M_TEMP, M_WAITOK); 609 *ap->a_cookies = cookies; 610 *ap->a_ncookies = ncookies; 611 } 612 613 for (ft = &fdesc_targets[i]; uio->uio_resid >= UIO_MX && 614 i < nfdesc_targets; ft++, i++) { 615 switch (ft->ft_fileno) { 616 case FD_CTTY: 617 if (cttyvp(curproc) == NULL) 618 continue; 619 break; 620 621 case FD_STDIN: 622 case FD_STDOUT: 623 case FD_STDERR: 624 if ((ft->ft_fileno - FD_STDIN) >= 625 dt->dt_nfiles) 626 continue; 627 if (dt->dt_ff[ft->ft_fileno - FD_STDIN] 628 == NULL || dt->dt_ff[ft->ft_fileno - 629 FD_STDIN]->ff_file == NULL) 630 continue; 631 break; 632 } 633 634 d.d_fileno = ft->ft_fileno; 635 d.d_namlen = ft->ft_namlen; 636 (void)memcpy(d.d_name, ft->ft_name, ft->ft_namlen + 1); 637 d.d_type = ft->ft_type; 638 639 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 640 break; 641 if (cookies) 642 *cookies++ = i + 1; 643 } 644 } else { 645 if (ap->a_ncookies) { 646 ncookies = uimin(ncookies, dt->dt_nfiles + 2); 647 cookies = malloc(ncookies * sizeof(off_t), 648 M_TEMP, M_WAITOK); 649 *ap->a_cookies = cookies; 650 *ap->a_ncookies = ncookies; 651 } 652 for (; i - 2 < dt->dt_nfiles && uio->uio_resid >= UIO_MX; i++) { 653 switch (i) { 654 case 0: 655 case 1: 656 d.d_fileno = FD_ROOT; /* XXX */ 657 d.d_namlen = i + 1; 658 (void)memcpy(d.d_name, "..", d.d_namlen); 659 d.d_name[i + 1] = '\0'; 660 d.d_type = DT_DIR; 661 break; 662 663 default: 664 j = (int)i - 2; 665 if (dt->dt_ff[j] == NULL || 666 dt->dt_ff[j]->ff_file == NULL) 667 continue; 668 d.d_fileno = j + FD_STDIN; 669 d.d_namlen = snprintf(d.d_name, 670 sizeof(d.d_name), "%d", j); 671 d.d_type = DT_UNKNOWN; 672 break; 673 } 674 675 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 676 break; 677 if (cookies) 678 *cookies++ = i + 1; 679 } 680 } 681 682 if (ap->a_ncookies && error) { 683 free(*ap->a_cookies, M_TEMP); 684 *ap->a_ncookies = 0; 685 *ap->a_cookies = NULL; 686 } 687 688 uio->uio_offset = i; 689 return error; 690 } 691 692 int 693 fdesc_readlink(void *v) 694 { 695 struct vop_readlink_args /* { 696 struct vnode *a_vp; 697 struct uio *a_uio; 698 kauth_cred_t a_cred; 699 } */ *ap = v; 700 struct vnode *vp = ap->a_vp; 701 int error; 702 703 if (vp->v_type != VLNK) 704 return (EPERM); 705 706 if (VTOFDESC(vp)->fd_type == Flink) { 707 const char *ln = VTOFDESC(vp)->fd_link; 708 error = uiomove(__UNCONST(ln), strlen(ln), ap->a_uio); 709 } else { 710 error = EOPNOTSUPP; 711 } 712 713 return (error); 714 } 715 716 int 717 fdesc_read(void *v) 718 { 719 struct vop_read_args /* { 720 struct vnode *a_vp; 721 struct uio *a_uio; 722 int a_ioflag; 723 kauth_cred_t a_cred; 724 } */ *ap = v; 725 int error = EOPNOTSUPP; 726 struct vnode *vp = ap->a_vp; 727 728 switch (VTOFDESC(vp)->fd_type) { 729 case Fctty: 730 VOP_UNLOCK(vp); 731 error = cdev_read(devctty, ap->a_uio, ap->a_ioflag); 732 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 733 break; 734 735 default: 736 error = EOPNOTSUPP; 737 break; 738 } 739 740 return (error); 741 } 742 743 int 744 fdesc_write(void *v) 745 { 746 struct vop_write_args /* { 747 struct vnode *a_vp; 748 struct uio *a_uio; 749 int a_ioflag; 750 kauth_cred_t a_cred; 751 } */ *ap = v; 752 int error = EOPNOTSUPP; 753 struct vnode *vp = ap->a_vp; 754 755 switch (VTOFDESC(vp)->fd_type) { 756 case Fctty: 757 VOP_UNLOCK(vp); 758 error = cdev_write(devctty, ap->a_uio, ap->a_ioflag); 759 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 760 break; 761 762 default: 763 error = EOPNOTSUPP; 764 break; 765 } 766 767 return (error); 768 } 769 770 int 771 fdesc_ioctl(void *v) 772 { 773 struct vop_ioctl_args /* { 774 struct vnode *a_vp; 775 u_long a_command; 776 void *a_data; 777 int a_fflag; 778 kauth_cred_t a_cred; 779 } */ *ap = v; 780 int error = EOPNOTSUPP; 781 782 switch (VTOFDESC(ap->a_vp)->fd_type) { 783 case Fctty: 784 error = cdev_ioctl(devctty, ap->a_command, ap->a_data, 785 ap->a_fflag, curlwp); 786 break; 787 788 default: 789 error = EOPNOTSUPP; 790 break; 791 } 792 793 return (error); 794 } 795 796 int 797 fdesc_poll(void *v) 798 { 799 struct vop_poll_args /* { 800 struct vnode *a_vp; 801 int a_events; 802 } */ *ap = v; 803 int revents; 804 805 switch (VTOFDESC(ap->a_vp)->fd_type) { 806 case Fctty: 807 revents = cdev_poll(devctty, ap->a_events, curlwp); 808 break; 809 810 default: 811 revents = genfs_poll(v); 812 break; 813 } 814 815 return (revents); 816 } 817 818 int 819 fdesc_kqfilter(void *v) 820 { 821 struct vop_kqfilter_args /* { 822 struct vnode *a_vp; 823 struct knote *a_kn; 824 } */ *ap = v; 825 int error, fd; 826 file_t *fp; 827 828 switch (VTOFDESC(ap->a_vp)->fd_type) { 829 case Fctty: 830 error = cdev_kqfilter(devctty, ap->a_kn); 831 break; 832 833 case Fdesc: 834 /* just invoke kqfilter for the underlying descriptor */ 835 fd = VTOFDESC(ap->a_vp)->fd_fd; 836 if ((fp = fd_getfile(fd)) == NULL) 837 return (1); 838 error = (*fp->f_ops->fo_kqfilter)(fp, ap->a_kn); 839 fd_putfile(fd); 840 break; 841 842 default: 843 return (genfs_kqfilter(v)); 844 } 845 846 return (error); 847 } 848 849 int 850 fdesc_inactive(void *v) 851 { 852 struct vop_inactive_v2_args /* { 853 struct vnode *a_vp; 854 } */ *ap = v; 855 struct vnode *vp = ap->a_vp; 856 struct fdescnode *fd = VTOFDESC(vp); 857 858 /* 859 * Clear out the v_type field to avoid 860 * nasty things happening on reclaim. 861 */ 862 if (fd->fd_type == Fctty || fd->fd_type == Fdesc) 863 vp->v_type = VNON; 864 865 return (0); 866 } 867 868 int 869 fdesc_reclaim(void *v) 870 { 871 struct vop_reclaim_v2_args /* { 872 struct vnode *a_vp; 873 } */ *ap = v; 874 struct vnode *vp = ap->a_vp; 875 struct fdescnode *fd = VTOFDESC(vp); 876 877 VOP_UNLOCK(vp); 878 879 vp->v_data = NULL; 880 kmem_free(fd, sizeof(struct fdescnode)); 881 882 return (0); 883 } 884 885 /* 886 * Return POSIX pathconf information applicable to special devices. 887 */ 888 int 889 fdesc_pathconf(void *v) 890 { 891 struct vop_pathconf_args /* { 892 struct vnode *a_vp; 893 int a_name; 894 register_t *a_retval; 895 } */ *ap = v; 896 897 switch (ap->a_name) { 898 case _PC_LINK_MAX: 899 *ap->a_retval = LINK_MAX; 900 return (0); 901 case _PC_MAX_CANON: 902 *ap->a_retval = MAX_CANON; 903 return (0); 904 case _PC_MAX_INPUT: 905 *ap->a_retval = MAX_INPUT; 906 return (0); 907 case _PC_PIPE_BUF: 908 *ap->a_retval = PIPE_BUF; 909 return (0); 910 case _PC_CHOWN_RESTRICTED: 911 *ap->a_retval = 1; 912 return (0); 913 case _PC_VDISABLE: 914 *ap->a_retval = _POSIX_VDISABLE; 915 return (0); 916 case _PC_SYNC_IO: 917 *ap->a_retval = 1; 918 return (0); 919 default: 920 return genfs_pathconf(ap); 921 } 922 /* NOTREACHED */ 923 } 924 925 /* 926 * Print out the contents of a /dev/fd vnode. 927 */ 928 /* ARGSUSED */ 929 int 930 fdesc_print(void *v) 931 { 932 printf("tag VT_NON, fdesc vnode\n"); 933 return (0); 934 } 935 936 int 937 fdesc_link(void *v) 938 { 939 struct vop_link_v2_args /* { 940 struct vnode *a_dvp; 941 struct vnode *a_vp; 942 struct componentname *a_cnp; 943 } */ *ap = v; 944 945 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 946 return (EROFS); 947 } 948 949 int 950 fdesc_symlink(void *v) 951 { 952 struct vop_symlink_v3_args /* { 953 struct vnode *a_dvp; 954 struct vnode **a_vpp; 955 struct componentname *a_cnp; 956 struct vattr *a_vap; 957 char *a_target; 958 } */ *ap = v; 959 960 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 961 return (EROFS); 962 } 963
Indexes created Wed Oct 22 06:10:02 GMT 2025