1 /* 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software donated to Berkeley by 6 * Jan-Simon Pendry. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)fdesc_vnops.c 8.9 (Berkeley) 1/21/94 37 * 38 * $Id$ 39 */ 40 41 /* 42 * /dev/fd Filesystem 43 */ 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/proc.h> 48 #include <sys/kernel.h> /* boottime */ 49 #include <sys/resourcevar.h> 50 #include <sys/filedesc.h> 51 #include <sys/unistd.h> 52 #include <sys/vnode.h> 53 #include <sys/malloc.h> 54 #include <sys/file.h> 55 #include <sys/stat.h> 56 #include <sys/mount.h> 57 #include <sys/namei.h> 58 #include <sys/buf.h> 59 #include <sys/dirent.h> 60 #include <sys/socketvar.h> 61 #include <sys/tty.h> 62 #include <sys/conf.h> 63 #include <miscfs/fdesc/fdesc.h> 64 65 extern struct cdevsw ctty_cdevsw; 66 67 #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL) 68 69 #define FDL_WANT 0x01 70 #define FDL_LOCKED 0x02 71 static int fdcache_lock; 72 73 dev_t devctty; 74 75 #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1) 76 FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2 77 #endif 78 79 #define NFDCACHE 4 80 #define FD_NHASH(ix) \ 81 (&fdhashtbl[(ix) & fdhash]) 82 LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl; 83 u_long fdhash; 84 85 static int fdesc_attr __P((int fd, struct vattr *vap, struct ucred *cred, 86 struct proc *p)); 87 static int fdesc_badop __P((void)); 88 static int fdesc_getattr __P((struct vop_getattr_args *ap)); 89 static struct fdcache * 90 fdesc_hash __P((int ix)); 91 static int fdesc_inactive __P((struct vop_inactive_args *ap)); 92 static int fdesc_ioctl __P((struct vop_ioctl_args *ap)); 93 static int fdesc_lookup __P((struct vop_lookup_args *ap)); 94 static int fdesc_open __P((struct vop_open_args *ap)); 95 static int fdesc_pathconf __P((struct vop_pathconf_args *ap)); 96 static int fdesc_print __P((struct vop_print_args *ap)); 97 static int fdesc_read __P((struct vop_read_args *ap)); 98 static int fdesc_readdir __P((struct vop_readdir_args *ap)); 99 static int fdesc_readlink __P((struct vop_readlink_args *ap)); 100 static int fdesc_reclaim __P((struct vop_reclaim_args *ap)); 101 static int fdesc_select __P((struct vop_select_args *ap)); 102 static int fdesc_setattr __P((struct vop_setattr_args *ap)); 103 static int fdesc_vfree __P((struct vop_vfree_args *ap)); 104 static int fdesc_write __P((struct vop_write_args *ap)); 105 106 /* 107 * Initialise cache headers 108 */ 109 int 110 fdesc_init(vfsp) 111 struct vfsconf *vfsp; 112 { 113 114 devctty = makedev(nchrdev, 0); 115 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash); 116 return (0); 117 } 118 119 int 120 fdesc_allocvp(ftype, ix, mp, vpp) 121 fdntype ftype; 122 int ix; 123 struct mount *mp; 124 struct vnode **vpp; 125 { 126 struct proc *p = curproc; /* XXX */ 127 struct fdhashhead *fc; 128 struct fdescnode *fd; 129 int error = 0; 130 131 fc = FD_NHASH(ix); 132 loop: 133 for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) { 134 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) { 135 if (vget(fd->fd_vnode, 0, p)) 136 goto loop; 137 *vpp = fd->fd_vnode; 138 return (error); 139 } 140 } 141 142 /* 143 * otherwise lock the array while we call getnewvnode 144 * since that can block. 145 */ 146 if (fdcache_lock & FDL_LOCKED) { 147 fdcache_lock |= FDL_WANT; 148 (void) tsleep((caddr_t) &fdcache_lock, PINOD, "fdalvp", 0); 149 goto loop; 150 } 151 fdcache_lock |= FDL_LOCKED; 152 153 /* 154 * Do the MALLOC before the getnewvnode since doing so afterward 155 * might cause a bogus v_data pointer to get dereferenced 156 * elsewhere if MALLOC should block. 157 */ 158 MALLOC(fd, struct fdescnode *, sizeof(struct fdescnode), M_TEMP, M_WAITOK); 159 160 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp); 161 if (error) { 162 FREE(fd, M_TEMP); 163 goto out; 164 } 165 (*vpp)->v_data = fd; 166 fd->fd_vnode = *vpp; 167 fd->fd_type = ftype; 168 fd->fd_fd = -1; 169 fd->fd_link = 0; 170 fd->fd_ix = ix; 171 LIST_INSERT_HEAD(fc, fd, fd_hash); 172 173 out:; 174 fdcache_lock &= ~FDL_LOCKED; 175 176 if (fdcache_lock & FDL_WANT) { 177 fdcache_lock &= ~FDL_WANT; 178 wakeup((caddr_t) &fdcache_lock); 179 } 180 181 return (error); 182 } 183 184 /* 185 * vp is the current namei directory 186 * ndp is the name to locate in that directory... 187 */ 188 static int 189 fdesc_lookup(ap) 190 struct vop_lookup_args /* { 191 struct vnode * a_dvp; 192 struct vnode ** a_vpp; 193 struct componentname * a_cnp; 194 } */ *ap; 195 { 196 struct vnode **vpp = ap->a_vpp; 197 struct vnode *dvp = ap->a_dvp; 198 struct componentname *cnp = ap->a_cnp; 199 char *pname = cnp->cn_nameptr; 200 struct proc *p = cnp->cn_proc; 201 int nfiles = p->p_fd->fd_nfiles; 202 unsigned fd; 203 int error; 204 struct vnode *fvp; 205 char *ln; 206 207 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) { 208 error = EROFS; 209 goto bad; 210 } 211 212 VOP_UNLOCK(dvp, 0, p); 213 if (cnp->cn_namelen == 1 && *pname == '.') { 214 *vpp = dvp; 215 VREF(dvp); 216 vn_lock(dvp, LK_SHARED | LK_RETRY, p); 217 return (0); 218 } 219 220 switch (VTOFDESC(dvp)->fd_type) { 221 default: 222 case Flink: 223 case Fdesc: 224 case Fctty: 225 error = ENOTDIR; 226 goto bad; 227 228 case Froot: 229 if (cnp->cn_namelen == 2 && bcmp(pname, "fd", 2) == 0) { 230 error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp); 231 if (error) 232 goto bad; 233 *vpp = fvp; 234 fvp->v_type = VDIR; 235 vn_lock(fvp, LK_SHARED | LK_RETRY, p); 236 return (0); 237 } 238 239 if (cnp->cn_namelen == 3 && bcmp(pname, "tty", 3) == 0) { 240 struct vnode *ttyvp = cttyvp(p); 241 if (ttyvp == NULL) { 242 error = ENXIO; 243 goto bad; 244 } 245 error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp); 246 if (error) 247 goto bad; 248 *vpp = fvp; 249 fvp->v_type = VFIFO; 250 vn_lock(fvp, LK_SHARED | LK_RETRY, p); 251 return (0); 252 } 253 254 ln = 0; 255 switch (cnp->cn_namelen) { 256 case 5: 257 if (bcmp(pname, "stdin", 5) == 0) { 258 ln = "fd/0"; 259 fd = FD_STDIN; 260 } 261 break; 262 case 6: 263 if (bcmp(pname, "stdout", 6) == 0) { 264 ln = "fd/1"; 265 fd = FD_STDOUT; 266 } else 267 if (bcmp(pname, "stderr", 6) == 0) { 268 ln = "fd/2"; 269 fd = FD_STDERR; 270 } 271 break; 272 } 273 274 if (ln) { 275 error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp); 276 if (error) 277 goto bad; 278 VTOFDESC(fvp)->fd_link = ln; 279 *vpp = fvp; 280 fvp->v_type = VLNK; 281 vn_lock(fvp, LK_SHARED | LK_RETRY, p); 282 return (0); 283 } else { 284 error = ENOENT; 285 goto bad; 286 } 287 288 /* FALL THROUGH */ 289 290 case Fdevfd: 291 if (cnp->cn_namelen == 2 && bcmp(pname, "..", 2) == 0) { 292 if (error = fdesc_root(dvp->v_mount, vpp)) 293 goto bad; 294 return (0); 295 } 296 297 fd = 0; 298 while (*pname >= '0' && *pname <= '9') { 299 fd = 10 * fd + *pname++ - '0'; 300 if (fd >= nfiles) 301 break; 302 } 303 304 if (*pname != '\0') { 305 error = ENOENT; 306 goto bad; 307 } 308 309 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) { 310 error = EBADF; 311 goto bad; 312 } 313 314 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp); 315 if (error) 316 goto bad; 317 VTOFDESC(fvp)->fd_fd = fd; 318 vn_lock(fvp, LK_SHARED | LK_RETRY, p); 319 *vpp = fvp; 320 return (0); 321 } 322 323 bad:; 324 vn_lock(dvp, LK_SHARED | LK_RETRY, p); 325 *vpp = NULL; 326 return (error); 327 } 328 329 static int 330 fdesc_open(ap) 331 struct vop_open_args /* { 332 struct vnode *a_vp; 333 int a_mode; 334 struct ucred *a_cred; 335 struct proc *a_p; 336 } */ *ap; 337 { 338 struct vnode *vp = ap->a_vp; 339 int error = 0; 340 341 switch (VTOFDESC(vp)->fd_type) { 342 case Fdesc: 343 /* 344 * XXX Kludge: set p->p_dupfd to contain the value of the 345 * the file descriptor being sought for duplication. The error 346 * return ensures that the vnode for this device will be 347 * released by vn_open. Open will detect this special error and 348 * take the actions in dupfdopen. Other callers of vn_open or 349 * VOP_OPEN will simply report the error. 350 */ 351 ap->a_p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */ 352 error = ENODEV; 353 break; 354 355 case Fctty: 356 error = (*ctty_cdevsw.d_open)(devctty, ap->a_mode, 0, ap->a_p); 357 break; 358 } 359 360 return (error); 361 } 362 363 static int 364 fdesc_attr(fd, vap, cred, p) 365 int fd; 366 struct vattr *vap; 367 struct ucred *cred; 368 struct proc *p; 369 { 370 struct filedesc *fdp = p->p_fd; 371 struct file *fp; 372 struct stat stb; 373 int error; 374 375 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) 376 return (EBADF); 377 378 switch (fp->f_type) { 379 case DTYPE_FIFO: 380 case DTYPE_VNODE: 381 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, p); 382 if (error == 0 && vap->va_type == VDIR) { 383 /* 384 * directories can cause loops in the namespace, 385 * so turn off the 'x' bits to avoid trouble. 386 */ 387 vap->va_mode &= ~((VEXEC)|(VEXEC>>3)|(VEXEC>>6)); 388 } 389 break; 390 391 case DTYPE_SOCKET: 392 error = soo_stat((struct socket *)fp->f_data, &stb); 393 if (error == 0) { 394 vattr_null(vap); 395 vap->va_type = VSOCK; 396 vap->va_mode = stb.st_mode; 397 vap->va_nlink = stb.st_nlink; 398 vap->va_uid = stb.st_uid; 399 vap->va_gid = stb.st_gid; 400 vap->va_fsid = stb.st_dev; 401 vap->va_fileid = stb.st_ino; 402 vap->va_size = stb.st_size; 403 vap->va_blocksize = stb.st_blksize; 404 vap->va_atime = stb.st_atimespec; 405 vap->va_mtime = stb.st_mtimespec; 406 vap->va_ctime = stb.st_ctimespec; 407 vap->va_gen = stb.st_gen; 408 vap->va_flags = stb.st_flags; 409 vap->va_rdev = stb.st_rdev; 410 vap->va_bytes = stb.st_blocks * stb.st_blksize; 411 } 412 break; 413 414 default: 415 panic("fdesc attr"); 416 break; 417 } 418 419 return (error); 420 } 421 422 static int 423 fdesc_getattr(ap) 424 struct vop_getattr_args /* { 425 struct vnode *a_vp; 426 struct vattr *a_vap; 427 struct ucred *a_cred; 428 struct proc *a_p; 429 } */ *ap; 430 { 431 struct vnode *vp = ap->a_vp; 432 struct vattr *vap = ap->a_vap; 433 unsigned fd; 434 int error = 0; 435 436 switch (VTOFDESC(vp)->fd_type) { 437 case Froot: 438 case Fdevfd: 439 case Flink: 440 case Fctty: 441 bzero((caddr_t) vap, sizeof(*vap)); 442 vattr_null(vap); 443 vap->va_fileid = VTOFDESC(vp)->fd_ix; 444 445 switch (VTOFDESC(vp)->fd_type) { 446 case Flink: 447 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 448 vap->va_type = VLNK; 449 vap->va_nlink = 1; 450 vap->va_size = strlen(VTOFDESC(vp)->fd_link); 451 break; 452 453 case Fctty: 454 vap->va_mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH; 455 vap->va_type = VFIFO; 456 vap->va_nlink = 1; 457 vap->va_size = 0; 458 break; 459 460 default: 461 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 462 vap->va_type = VDIR; 463 vap->va_nlink = 2; 464 vap->va_size = DEV_BSIZE; 465 break; 466 } 467 vap->va_uid = 0; 468 vap->va_gid = 0; 469 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 470 vap->va_blocksize = DEV_BSIZE; 471 vap->va_atime.tv_sec = boottime.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_rdev = 0; 478 vap->va_bytes = 0; 479 break; 480 481 case Fdesc: 482 fd = VTOFDESC(vp)->fd_fd; 483 error = fdesc_attr(fd, vap, ap->a_cred, ap->a_p); 484 break; 485 486 default: 487 panic("fdesc_getattr"); 488 break; 489 } 490 491 if (error == 0) 492 vp->v_type = vap->va_type; 493 494 return (error); 495 } 496 497 static int 498 fdesc_setattr(ap) 499 struct vop_setattr_args /* { 500 struct vnode *a_vp; 501 struct vattr *a_vap; 502 struct ucred *a_cred; 503 struct proc *a_p; 504 } */ *ap; 505 { 506 struct filedesc *fdp = ap->a_p->p_fd; 507 struct file *fp; 508 unsigned fd; 509 int error; 510 511 /* 512 * Can't mess with the root vnode 513 */ 514 switch (VTOFDESC(ap->a_vp)->fd_type) { 515 case Fdesc: 516 break; 517 518 case Fctty: 519 return (0); 520 521 default: 522 return (EACCES); 523 } 524 525 fd = VTOFDESC(ap->a_vp)->fd_fd; 526 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) { 527 return (EBADF); 528 } 529 530 /* 531 * Can setattr the underlying vnode, but not sockets! 532 */ 533 switch (fp->f_type) { 534 case DTYPE_FIFO: 535 case DTYPE_VNODE: 536 error = VOP_SETATTR((struct vnode *) fp->f_data, ap->a_vap, ap->a_cred, ap->a_p); 537 break; 538 539 case DTYPE_SOCKET: 540 error = 0; 541 break; 542 543 default: 544 error = EBADF; 545 break; 546 } 547 548 return (error); 549 } 550 551 #define UIO_MX 16 552 553 static struct dirtmp { 554 u_long d_fileno; 555 u_short d_reclen; 556 u_short d_namlen; 557 char d_name[8]; 558 } rootent[] = { 559 { FD_DEVFD, UIO_MX, 2, "fd" }, 560 { FD_STDIN, UIO_MX, 5, "stdin" }, 561 { FD_STDOUT, UIO_MX, 6, "stdout" }, 562 { FD_STDERR, UIO_MX, 6, "stderr" }, 563 { FD_CTTY, UIO_MX, 3, "tty" }, 564 { 0 } 565 }; 566 567 static int 568 fdesc_readdir(ap) 569 struct vop_readdir_args /* { 570 struct vnode *a_vp; 571 struct uio *a_uio; 572 struct ucred *a_cred; 573 int *a_eofflag; 574 u_long *a_cookies; 575 int a_ncookies; 576 } */ *ap; 577 { 578 struct uio *uio = ap->a_uio; 579 struct filedesc *fdp; 580 int i; 581 int error; 582 583 /* 584 * We don't allow exporting fdesc mounts, and currently local 585 * requests do not need cookies. 586 */ 587 if (ap->a_ncookies) 588 panic("fdesc_readdir: not hungry"); 589 590 switch (VTOFDESC(ap->a_vp)->fd_type) { 591 case Fctty: 592 return (0); 593 594 case Fdesc: 595 return (ENOTDIR); 596 597 default: 598 break; 599 } 600 601 fdp = uio->uio_procp->p_fd; 602 603 if (VTOFDESC(ap->a_vp)->fd_type == Froot) { 604 struct dirent d; 605 struct dirent *dp = &d; 606 struct dirtmp *dt; 607 608 i = uio->uio_offset / UIO_MX; 609 error = 0; 610 611 while (uio->uio_resid > 0) { 612 dt = &rootent[i]; 613 if (dt->d_fileno == 0) { 614 /**eofflagp = 1;*/ 615 break; 616 } 617 i++; 618 619 switch (dt->d_fileno) { 620 case FD_CTTY: 621 if (cttyvp(uio->uio_procp) == NULL) 622 continue; 623 break; 624 625 case FD_STDIN: 626 case FD_STDOUT: 627 case FD_STDERR: 628 if ((dt->d_fileno-FD_STDIN) >= fdp->fd_nfiles) 629 continue; 630 if (fdp->fd_ofiles[dt->d_fileno-FD_STDIN] == NULL) 631 continue; 632 break; 633 } 634 bzero((caddr_t) dp, UIO_MX); 635 dp->d_fileno = dt->d_fileno; 636 dp->d_namlen = dt->d_namlen; 637 dp->d_type = DT_UNKNOWN; 638 dp->d_reclen = dt->d_reclen; 639 bcopy(dt->d_name, dp->d_name, dp->d_namlen+1); 640 error = uiomove((caddr_t) dp, UIO_MX, uio); 641 if (error) 642 break; 643 } 644 uio->uio_offset = i * UIO_MX; 645 return (error); 646 } 647 648 i = uio->uio_offset / UIO_MX; 649 error = 0; 650 while (uio->uio_resid > 0) { 651 if (i >= fdp->fd_nfiles) 652 break; 653 654 if (fdp->fd_ofiles[i] != NULL) { 655 struct dirent d; 656 struct dirent *dp = &d; 657 658 bzero((caddr_t) dp, UIO_MX); 659 660 dp->d_namlen = sprintf(dp->d_name, "%d", i); 661 dp->d_reclen = UIO_MX; 662 dp->d_type = DT_UNKNOWN; 663 dp->d_fileno = i + FD_STDIN; 664 /* 665 * And ship to userland 666 */ 667 error = uiomove((caddr_t) dp, UIO_MX, uio); 668 if (error) 669 break; 670 } 671 i++; 672 } 673 674 uio->uio_offset = i * UIO_MX; 675 return (error); 676 } 677 678 static int 679 fdesc_readlink(ap) 680 struct vop_readlink_args /* { 681 struct vnode *a_vp; 682 struct uio *a_uio; 683 struct ucred *a_cred; 684 } */ *ap; 685 { 686 struct vnode *vp = ap->a_vp; 687 int error; 688 689 if (vp->v_type != VLNK) 690 return (EPERM); 691 692 if (VTOFDESC(vp)->fd_type == Flink) { 693 char *ln = VTOFDESC(vp)->fd_link; 694 error = uiomove(ln, strlen(ln), ap->a_uio); 695 } else { 696 error = EOPNOTSUPP; 697 } 698 699 return (error); 700 } 701 702 static int 703 fdesc_read(ap) 704 struct vop_read_args /* { 705 struct vnode *a_vp; 706 struct uio *a_uio; 707 int a_ioflag; 708 struct ucred *a_cred; 709 } */ *ap; 710 { 711 int error = EOPNOTSUPP; 712 713 switch (VTOFDESC(ap->a_vp)->fd_type) { 714 case Fctty: 715 error = (*ctty_cdevsw.d_read)(devctty, ap->a_uio, ap->a_ioflag); 716 break; 717 718 default: 719 error = EOPNOTSUPP; 720 break; 721 } 722 723 return (error); 724 } 725 726 static int 727 fdesc_write(ap) 728 struct vop_write_args /* { 729 struct vnode *a_vp; 730 struct uio *a_uio; 731 int a_ioflag; 732 struct ucred *a_cred; 733 } */ *ap; 734 { 735 int error = EOPNOTSUPP; 736 737 switch (VTOFDESC(ap->a_vp)->fd_type) { 738 case Fctty: 739 error = (*ctty_cdevsw.d_write)(devctty, ap->a_uio, ap->a_ioflag); 740 break; 741 742 default: 743 error = EOPNOTSUPP; 744 break; 745 } 746 747 return (error); 748 } 749 750 static int 751 fdesc_ioctl(ap) 752 struct vop_ioctl_args /* { 753 struct vnode *a_vp; 754 int a_command; 755 caddr_t a_data; 756 int a_fflag; 757 struct ucred *a_cred; 758 struct proc *a_p; 759 } */ *ap; 760 { 761 int error = EOPNOTSUPP; 762 763 switch (VTOFDESC(ap->a_vp)->fd_type) { 764 case Fctty: 765 error = (*ctty_cdevsw.d_ioctl)(devctty, ap->a_command, 766 ap->a_data, ap->a_fflag, ap->a_p); 767 break; 768 769 default: 770 error = EOPNOTSUPP; 771 break; 772 } 773 774 return (error); 775 } 776 777 static int 778 fdesc_select(ap) 779 struct vop_select_args /* { 780 struct vnode *a_vp; 781 int a_which; 782 int a_fflags; 783 struct ucred *a_cred; 784 struct proc *a_p; 785 } */ *ap; 786 { 787 int error = EOPNOTSUPP; 788 789 switch (VTOFDESC(ap->a_vp)->fd_type) { 790 case Fctty: 791 error = (*ctty_cdevsw.d_select)(devctty, ap->a_fflags, ap->a_p); 792 break; 793 794 default: 795 error = EOPNOTSUPP; 796 break; 797 } 798 799 return (error); 800 } 801 802 static int 803 fdesc_inactive(ap) 804 struct vop_inactive_args /* { 805 struct vnode *a_vp; 806 struct proc *a_p; 807 } */ *ap; 808 { 809 struct vnode *vp = ap->a_vp; 810 811 /* 812 * Clear out the v_type field to avoid 813 * nasty things happening in vgone(). 814 */ 815 VOP_UNLOCK(vp, 0, ap->a_p); 816 vp->v_type = VNON; 817 return (0); 818 } 819 820 static int 821 fdesc_reclaim(ap) 822 struct vop_reclaim_args /* { 823 struct vnode *a_vp; 824 } */ *ap; 825 { 826 struct vnode *vp = ap->a_vp; 827 struct fdescnode *fd = VTOFDESC(vp); 828 829 LIST_REMOVE(fd, fd_hash); 830 FREE(vp->v_data, M_TEMP); 831 vp->v_data = 0; 832 833 return (0); 834 } 835 836 /* 837 * Return POSIX pathconf information applicable to special devices. 838 */ 839 static int 840 fdesc_pathconf(ap) 841 struct vop_pathconf_args /* { 842 struct vnode *a_vp; 843 int a_name; 844 int *a_retval; 845 } */ *ap; 846 { 847 848 switch (ap->a_name) { 849 case _PC_LINK_MAX: 850 *ap->a_retval = LINK_MAX; 851 return (0); 852 case _PC_MAX_CANON: 853 *ap->a_retval = MAX_CANON; 854 return (0); 855 case _PC_MAX_INPUT: 856 *ap->a_retval = MAX_INPUT; 857 return (0); 858 case _PC_PIPE_BUF: 859 *ap->a_retval = PIPE_BUF; 860 return (0); 861 case _PC_CHOWN_RESTRICTED: 862 *ap->a_retval = 1; 863 return (0); 864 case _PC_VDISABLE: 865 *ap->a_retval = _POSIX_VDISABLE; 866 return (0); 867 default: 868 return (EINVAL); 869 } 870 /* NOTREACHED */ 871 } 872 873 /* 874 * Print out the contents of a /dev/fd vnode. 875 */ 876 /* ARGSUSED */ 877 static int 878 fdesc_print(ap) 879 struct vop_print_args /* { 880 struct vnode *a_vp; 881 } */ *ap; 882 { 883 884 printf("tag VT_NON, fdesc vnode\n"); 885 return (0); 886 } 887 888 /*void*/ 889 static int 890 fdesc_vfree(ap) 891 struct vop_vfree_args /* { 892 struct vnode *a_pvp; 893 ino_t a_ino; 894 int a_mode; 895 } */ *ap; 896 { 897 898 return (0); 899 } 900 901 /* 902 * /dev/fd "should never get here" operation 903 */ 904 static int 905 fdesc_badop() 906 { 907 908 panic("fdesc: bad op"); 909 /* NOTREACHED */ 910 } 911 912 #define fdesc_create ((int (*) __P((struct vop_create_args *)))eopnotsupp) 913 #define fdesc_mknod ((int (*) __P((struct vop_mknod_args *)))eopnotsupp) 914 #define fdesc_close ((int (*) __P((struct vop_close_args *)))nullop) 915 #define fdesc_access ((int (*) __P((struct vop_access_args *)))nullop) 916 #define fdesc_mmap ((int (*) __P((struct vop_mmap_args *)))eopnotsupp) 917 #define fdesc_revoke vop_revoke 918 #define fdesc_fsync ((int (*) __P((struct vop_fsync_args *)))nullop) 919 #define fdesc_seek ((int (*) __P((struct vop_seek_args *)))nullop) 920 #define fdesc_remove ((int (*) __P((struct vop_remove_args *)))eopnotsupp) 921 #define fdesc_link ((int (*) __P((struct vop_link_args *)))eopnotsupp) 922 #define fdesc_rename ((int (*) __P((struct vop_rename_args *)))eopnotsupp) 923 #define fdesc_mkdir ((int (*) __P((struct vop_mkdir_args *)))eopnotsupp) 924 #define fdesc_rmdir ((int (*) __P((struct vop_rmdir_args *)))eopnotsupp) 925 #define fdesc_symlink ((int (*) __P((struct vop_symlink_args *)))eopnotsupp) 926 #define fdesc_abortop ((int (*) __P((struct vop_abortop_args *)))nullop) 927 #define fdesc_lock ((int (*) __P((struct vop_lock_args *)))vop_nolock) 928 #define fdesc_unlock ((int (*) __P((struct vop_unlock_args *)))vop_nounlock) 929 #define fdesc_bmap ((int (*) __P((struct vop_bmap_args *)))fdesc_badop) 930 #define fdesc_strategy ((int (*) __P((struct vop_strategy_args *)))fdesc_badop) 931 #define fdesc_islocked \ 932 ((int (*) __P((struct vop_islocked_args *)))vop_noislocked) 933 #define fdesc_advlock ((int (*) __P((struct vop_advlock_args *)))eopnotsupp) 934 #define fdesc_blkatoff \ 935 ((int (*) __P((struct vop_blkatoff_args *)))eopnotsupp) 936 #define fdesc_valloc ((int(*) __P(( \ 937 struct vnode *pvp, \ 938 int mode, \ 939 struct ucred *cred, \ 940 struct vnode **vpp))) eopnotsupp) 941 #define fdesc_truncate \ 942 ((int (*) __P((struct vop_truncate_args *)))eopnotsupp) 943 #define fdesc_update ((int (*) __P((struct vop_update_args *)))eopnotsupp) 944 #define fdesc_bwrite ((int (*) __P((struct vop_bwrite_args *)))eopnotsupp) 945 946 static vop_t **fdesc_vnodeop_p; 947 static struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = { 948 { &vop_default_desc, (vop_t *)vn_default_error }, 949 { &vop_lookup_desc, (vop_t *)fdesc_lookup }, /* lookup */ 950 { &vop_create_desc, (vop_t *)fdesc_create }, /* create */ 951 { &vop_mknod_desc, (vop_t *)fdesc_mknod }, /* mknod */ 952 { &vop_open_desc, (vop_t *)fdesc_open }, /* open */ 953 { &vop_close_desc, (vop_t *)fdesc_close }, /* close */ 954 { &vop_access_desc, (vop_t *)fdesc_access }, /* access */ 955 { &vop_getattr_desc, (vop_t *)fdesc_getattr }, /* getattr */ 956 { &vop_setattr_desc, (vop_t *)fdesc_setattr }, /* setattr */ 957 { &vop_read_desc, (vop_t *)fdesc_read }, /* read */ 958 { &vop_write_desc, (vop_t *)fdesc_write }, /* write */ 959 { &vop_ioctl_desc, (vop_t *)fdesc_ioctl }, /* ioctl */ 960 { &vop_select_desc, (vop_t *)fdesc_select }, /* select */ 961 { &vop_revoke_desc, (vop_t *)fdesc_revoke }, /* revoke */ 962 { &vop_mmap_desc, (vop_t *)fdesc_mmap }, /* mmap */ 963 { &vop_fsync_desc, (vop_t *)fdesc_fsync }, /* fsync */ 964 { &vop_seek_desc, (vop_t *)fdesc_seek }, /* seek */ 965 { &vop_remove_desc, (vop_t *)fdesc_remove }, /* remove */ 966 { &vop_link_desc, (vop_t *)fdesc_link }, /* link */ 967 { &vop_rename_desc, (vop_t *)fdesc_rename }, /* rename */ 968 { &vop_mkdir_desc, (vop_t *)fdesc_mkdir }, /* mkdir */ 969 { &vop_rmdir_desc, (vop_t *)fdesc_rmdir }, /* rmdir */ 970 { &vop_symlink_desc, (vop_t *)fdesc_symlink }, /* symlink */ 971 { &vop_readdir_desc, (vop_t *)fdesc_readdir }, /* readdir */ 972 { &vop_readlink_desc, (vop_t *)fdesc_readlink }, /* readlink */ 973 { &vop_abortop_desc, (vop_t *)fdesc_abortop }, /* abortop */ 974 { &vop_inactive_desc, (vop_t *)fdesc_inactive }, /* inactive */ 975 { &vop_reclaim_desc, (vop_t *)fdesc_reclaim }, /* reclaim */ 976 { &vop_lock_desc, (vop_t *)fdesc_lock }, /* lock */ 977 { &vop_unlock_desc, (vop_t *)fdesc_unlock }, /* unlock */ 978 { &vop_bmap_desc, (vop_t *)fdesc_bmap }, /* bmap */ 979 { &vop_strategy_desc, (vop_t *)fdesc_strategy }, /* strategy */ 980 { &vop_print_desc, (vop_t *)fdesc_print }, /* print */ 981 { &vop_islocked_desc, (vop_t *)fdesc_islocked }, /* islocked */ 982 { &vop_pathconf_desc, (vop_t *)fdesc_pathconf }, /* pathconf */ 983 { &vop_advlock_desc, (vop_t *)fdesc_advlock }, /* advlock */ 984 { &vop_blkatoff_desc, (vop_t *)fdesc_blkatoff }, /* blkatoff */ 985 { &vop_valloc_desc, (vop_t *)fdesc_valloc }, /* valloc */ 986 { &vop_vfree_desc, (vop_t *)fdesc_vfree }, /* vfree */ 987 { &vop_truncate_desc, (vop_t *)fdesc_truncate }, /* truncate */ 988 { &vop_update_desc, (vop_t *)fdesc_update }, /* update */ 989 { &vop_bwrite_desc, (vop_t *)fdesc_bwrite }, /* bwrite */ 990 { NULL, NULL } 991 }; 992 static struct vnodeopv_desc fdesc_vnodeop_opv_desc = 993 { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; 994 995 VNODEOP_SET(fdesc_vnodeop_opv_desc); 996