| 1 | /* $NetBSD: fdesc_vnops.c,v 1.127 2016/08/20 12:37:08 hannken 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 1.127 2016/08/20 12:37:08 hannken 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 | #include <sys/atomic.h> |
| 66 | |
| 67 | #include <miscfs/fdesc/fdesc.h> |
| 68 | #include <miscfs/genfs/genfs.h> |
| 69 | |
| 70 | #define cttyvp(p) ((p)->p_lflag & PL_CONTROLT ? (p)->p_session->s_ttyvp : NULL) |
| 71 | |
| 72 | dev_t devctty; |
| 73 | |
| 74 | #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1) |
| 75 | FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2 |
| 76 | #endif |
| 77 | |
| 78 | int fdesc_lookup(void *); |
| 79 | #define fdesc_create genfs_eopnotsupp |
| 80 | #define fdesc_mknod genfs_eopnotsupp |
| 81 | int fdesc_open(void *); |
| 82 | #define fdesc_close genfs_nullop |
| 83 | #define fdesc_access genfs_nullop |
| 84 | int fdesc_getattr(void *); |
| 85 | int fdesc_setattr(void *); |
| 86 | int fdesc_read(void *); |
| 87 | int fdesc_write(void *); |
| 88 | int fdesc_ioctl(void *); |
| 89 | int fdesc_poll(void *); |
| 90 | int fdesc_kqfilter(void *); |
| 91 | #define fdesc_mmap genfs_eopnotsupp |
| 92 | #define fdesc_fcntl genfs_fcntl |
| 93 | #define fdesc_fsync genfs_nullop |
| 94 | #define fdesc_seek genfs_seek |
| 95 | #define fdesc_remove genfs_eopnotsupp |
| 96 | int fdesc_link(void *); |
| 97 | #define fdesc_rename genfs_eopnotsupp |
| 98 | #define fdesc_mkdir genfs_eopnotsupp |
| 99 | #define fdesc_rmdir genfs_eopnotsupp |
| 100 | int fdesc_symlink(void *); |
| 101 | int fdesc_readdir(void *); |
| 102 | int fdesc_readlink(void *); |
| 103 | #define fdesc_abortop genfs_abortop |
| 104 | int fdesc_inactive(void *); |
| 105 | int fdesc_reclaim(void *); |
| 106 | #define fdesc_lock genfs_lock |
| 107 | #define fdesc_unlock genfs_unlock |
| 108 | #define fdesc_bmap genfs_badop |
| 109 | #define fdesc_strategy genfs_badop |
| 110 | int fdesc_print(void *); |
| 111 | int fdesc_pathconf(void *); |
| 112 | #define fdesc_islocked genfs_islocked |
| 113 | #define fdesc_advlock genfs_einval |
| 114 | #define fdesc_bwrite genfs_eopnotsupp |
| 115 | #define fdesc_revoke genfs_revoke |
| 116 | #define fdesc_putpages genfs_null_putpages |
| 117 | |
| 118 | static int fdesc_attr(int, struct vattr *, kauth_cred_t); |
| 119 | |
| 120 | int (**fdesc_vnodeop_p)(void *); |
| 121 | const struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = { |
| 122 | { &vop_default_desc, vn_default_error }, |
| 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_getattr_desc, fdesc_getattr }, /* getattr */ |
| 130 | { &vop_setattr_desc, fdesc_setattr }, /* setattr */ |
| 131 | { &vop_read_desc, fdesc_read }, /* read */ |
| 132 | { &vop_write_desc, fdesc_write }, /* write */ |
| 133 | { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ |
| 134 | { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ |
| 135 | { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */ |
| 136 | { &vop_fcntl_desc, fdesc_fcntl }, /* fcntl */ |
| 137 | { &vop_poll_desc, fdesc_poll }, /* poll */ |
| 138 | { &vop_kqfilter_desc, fdesc_kqfilter }, /* kqfilter */ |
| 139 | { &vop_revoke_desc, fdesc_revoke }, /* revoke */ |
| 140 | { &vop_mmap_desc, fdesc_mmap }, /* mmap */ |
| 141 | { &vop_fsync_desc, fdesc_fsync }, /* fsync */ |
| 142 | { &vop_seek_desc, fdesc_seek }, /* seek */ |
| 143 | { &vop_remove_desc, fdesc_remove }, /* remove */ |
| 144 | { &vop_link_desc, fdesc_link }, /* link */ |
| 145 | { &vop_rename_desc, fdesc_rename }, /* rename */ |
| 146 | { &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */ |
| 147 | { &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */ |
| 148 | { &vop_symlink_desc, fdesc_symlink }, /* symlink */ |
| 149 | { &vop_readdir_desc, fdesc_readdir }, /* readdir */ |
| 150 | { &vop_readlink_desc, fdesc_readlink }, /* readlink */ |
| 151 | { &vop_abortop_desc, fdesc_abortop }, /* abortop */ |
| 152 | { &vop_inactive_desc, fdesc_inactive }, /* inactive */ |
| 153 | { &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */ |
| 154 | { &vop_lock_desc, fdesc_lock }, /* lock */ |
| 155 | { &vop_unlock_desc, fdesc_unlock }, /* unlock */ |
| 156 | { &vop_bmap_desc, fdesc_bmap }, /* bmap */ |
| 157 | { &vop_strategy_desc, fdesc_strategy }, /* strategy */ |
| 158 | { &vop_print_desc, fdesc_print }, /* print */ |
| 159 | { &vop_islocked_desc, fdesc_islocked }, /* islocked */ |
| 160 | { &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */ |
| 161 | { &vop_advlock_desc, fdesc_advlock }, /* advlock */ |
| 162 | { &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */ |
| 163 | { &vop_putpages_desc, fdesc_putpages }, /* putpages */ |
| 164 | { NULL, NULL } |
| 165 | }; |
| 166 | |
| 167 | const struct vnodeopv_desc fdesc_vnodeop_opv_desc = |
| 168 | { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; |
| 169 | |
| 170 | /* |
| 171 | * Initialise cache headers |
| 172 | */ |
| 173 | void |
| 174 | fdesc_init(void) |
| 175 | { |
| 176 | int cttymajor; |
| 177 | |
| 178 | /* locate the major number */ |
| 179 | cttymajor = devsw_name2chr("ctty" , NULL, 0); |
| 180 | devctty = makedev(cttymajor, 0); |
| 181 | } |
| 182 | |
| 183 | void |
| 184 | fdesc_done(void) |
| 185 | { |
| 186 | } |
| 187 | |
| 188 | /* |
| 189 | * vp is the current namei directory |
| 190 | * ndp is the name to locate in that directory... |
| 191 | */ |
| 192 | int |
| 193 | fdesc_lookup(void *v) |
| 194 | { |
| 195 | struct vop_lookup_v2_args /* { |
| 196 | struct vnode * a_dvp; |
| 197 | struct vnode ** a_vpp; |
| 198 | struct componentname * a_cnp; |
| 199 | } */ *ap = v; |
| 200 | struct vnode **vpp = ap->a_vpp; |
| 201 | struct vnode *dvp = ap->a_dvp; |
| 202 | struct componentname *cnp = ap->a_cnp; |
| 203 | struct lwp *l = curlwp; |
| 204 | const char *pname = cnp->cn_nameptr; |
| 205 | struct proc *p = l->l_proc; |
| 206 | unsigned fd = 0; |
| 207 | int error, ix = -1; |
| 208 | fdtab_t *dt; |
| 209 | |
| 210 | dt = curlwp->l_fd->fd_dt; |
| 211 | |
| 212 | if (cnp->cn_namelen == 1 && *pname == '.') { |
| 213 | *vpp = dvp; |
| 214 | vref(dvp); |
| 215 | return (0); |
| 216 | } |
| 217 | |
| 218 | switch (VTOFDESC(dvp)->fd_type) { |
| 219 | default: |
| 220 | case Flink: |
| 221 | case Fdesc: |
| 222 | case Fctty: |
| 223 | error = ENOTDIR; |
| 224 | goto bad; |
| 225 | |
| 226 | case Froot: |
| 227 | if (cnp->cn_namelen == 2 && memcmp(pname, "fd" , 2) == 0) { |
| 228 | ix = FD_DEVFD; |
| 229 | goto good; |
| 230 | } |
| 231 | |
| 232 | if (cnp->cn_namelen == 3 && memcmp(pname, "tty" , 3) == 0) { |
| 233 | struct vnode *ttyvp = cttyvp(p); |
| 234 | if (ttyvp == NULL) { |
| 235 | error = ENXIO; |
| 236 | goto bad; |
| 237 | } |
| 238 | ix = FD_CTTY; |
| 239 | goto good; |
| 240 | } |
| 241 | |
| 242 | switch (cnp->cn_namelen) { |
| 243 | case 5: |
| 244 | if (memcmp(pname, "stdin" , 5) == 0) { |
| 245 | ix = FD_STDIN; |
| 246 | goto good; |
| 247 | } |
| 248 | break; |
| 249 | case 6: |
| 250 | if (memcmp(pname, "stdout" , 6) == 0) { |
| 251 | ix = FD_STDOUT; |
| 252 | goto good; |
| 253 | } else if (memcmp(pname, "stderr" , 6) == 0) { |
| 254 | ix = FD_STDERR; |
| 255 | goto good; |
| 256 | } |
| 257 | break; |
| 258 | } |
| 259 | |
| 260 | error = ENOENT; |
| 261 | goto bad; |
| 262 | |
| 263 | case Fdevfd: |
| 264 | if (cnp->cn_namelen == 2 && memcmp(pname, ".." , 2) == 0) { |
| 265 | ix = FD_ROOT; |
| 266 | goto good; |
| 267 | } |
| 268 | |
| 269 | fd = 0; |
| 270 | while (*pname >= '0' && *pname <= '9') { |
| 271 | fd = 10 * fd + *pname++ - '0'; |
| 272 | if (fd >= dt->dt_nfiles) |
| 273 | break; |
| 274 | } |
| 275 | |
| 276 | if (*pname != '\0') { |
| 277 | error = ENOENT; |
| 278 | goto bad; |
| 279 | } |
| 280 | |
| 281 | if (fd >= dt->dt_nfiles || dt->dt_ff[fd] == NULL || |
| 282 | dt->dt_ff[fd]->ff_file == NULL) { |
| 283 | error = EBADF; |
| 284 | goto bad; |
| 285 | } |
| 286 | |
| 287 | ix = FD_DESC + fd; |
| 288 | goto good; |
| 289 | } |
| 290 | |
| 291 | bad: |
| 292 | *vpp = NULL; |
| 293 | return error; |
| 294 | |
| 295 | good: |
| 296 | KASSERT(ix != -1); |
| 297 | error = vcache_get(dvp->v_mount, &ix, sizeof(ix), vpp); |
| 298 | if (error == 0 && ix == FD_CTTY) |
| 299 | (*vpp)->v_type = VCHR; |
| 300 | return error; |
| 301 | } |
| 302 | |
| 303 | int |
| 304 | fdesc_open(void *v) |
| 305 | { |
| 306 | struct vop_open_args /* { |
| 307 | struct vnode *a_vp; |
| 308 | int a_mode; |
| 309 | kauth_cred_t a_cred; |
| 310 | } */ *ap = v; |
| 311 | struct vnode *vp = ap->a_vp; |
| 312 | |
| 313 | switch (VTOFDESC(vp)->fd_type) { |
| 314 | case Fdesc: |
| 315 | /* |
| 316 | * XXX Kludge: set dupfd to contain the value of the |
| 317 | * the file descriptor being sought for duplication. The error |
| 318 | * return ensures that the vnode for this device will be |
| 319 | * released by vn_open. Open will detect this special error and |
| 320 | * take the actions in dupfdopen. Other callers of vn_open or |
| 321 | * VOP_OPEN will simply report the error. |
| 322 | */ |
| 323 | curlwp->l_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */ |
| 324 | return EDUPFD; |
| 325 | |
| 326 | case Fctty: |
| 327 | return cdev_open(devctty, ap->a_mode, 0, curlwp); |
| 328 | case Froot: |
| 329 | case Fdevfd: |
| 330 | case Flink: |
| 331 | break; |
| 332 | } |
| 333 | |
| 334 | return (0); |
| 335 | } |
| 336 | |
| 337 | static int |
| 338 | fdesc_attr(int fd, struct vattr *vap, kauth_cred_t cred) |
| 339 | { |
| 340 | file_t *fp; |
| 341 | struct stat stb; |
| 342 | int error; |
| 343 | |
| 344 | if ((fp = fd_getfile(fd)) == NULL) |
| 345 | return (EBADF); |
| 346 | |
| 347 | switch (fp->f_type) { |
| 348 | case DTYPE_VNODE: |
| 349 | vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); |
| 350 | error = VOP_GETATTR(fp->f_vnode, vap, cred); |
| 351 | VOP_UNLOCK(fp->f_vnode); |
| 352 | if (error == 0 && vap->va_type == VDIR) { |
| 353 | /* |
| 354 | * directories can cause loops in the namespace, |
| 355 | * so turn off the 'x' bits to avoid trouble. |
| 356 | */ |
| 357 | vap->va_mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH); |
| 358 | } |
| 359 | break; |
| 360 | |
| 361 | default: |
| 362 | memset(&stb, 0, sizeof(stb)); |
| 363 | error = (*fp->f_ops->fo_stat)(fp, &stb); |
| 364 | if (error) |
| 365 | break; |
| 366 | |
| 367 | vattr_null(vap); |
| 368 | switch(fp->f_type) { |
| 369 | case DTYPE_SOCKET: |
| 370 | vap->va_type = VSOCK; |
| 371 | break; |
| 372 | case DTYPE_PIPE: |
| 373 | vap->va_type = VFIFO; |
| 374 | break; |
| 375 | default: |
| 376 | /* use VNON perhaps? */ |
| 377 | vap->va_type = VBAD; |
| 378 | break; |
| 379 | } |
| 380 | vap->va_mode = stb.st_mode; |
| 381 | vap->va_nlink = stb.st_nlink; |
| 382 | vap->va_uid = stb.st_uid; |
| 383 | vap->va_gid = stb.st_gid; |
| 384 | vap->va_fsid = stb.st_dev; |
| 385 | vap->va_fileid = stb.st_ino; |
| 386 | vap->va_size = stb.st_size; |
| 387 | vap->va_blocksize = stb.st_blksize; |
| 388 | vap->va_atime = stb.st_atimespec; |
| 389 | vap->va_mtime = stb.st_mtimespec; |
| 390 | vap->va_ctime = stb.st_ctimespec; |
| 391 | vap->va_gen = stb.st_gen; |
| 392 | vap->va_flags = stb.st_flags; |
| 393 | vap->va_rdev = stb.st_rdev; |
| 394 | vap->va_bytes = stb.st_blocks * stb.st_blksize; |
| 395 | break; |
| 396 | } |
| 397 | |
| 398 | fd_putfile(fd); |
| 399 | return (error); |
| 400 | } |
| 401 | |
| 402 | int |
| 403 | fdesc_getattr(void *v) |
| 404 | { |
| 405 | struct vop_getattr_args /* { |
| 406 | struct vnode *a_vp; |
| 407 | struct vattr *a_vap; |
| 408 | kauth_cred_t a_cred; |
| 409 | struct lwp *a_l; |
| 410 | } */ *ap = v; |
| 411 | struct vnode *vp = ap->a_vp; |
| 412 | struct vattr *vap = ap->a_vap; |
| 413 | unsigned fd; |
| 414 | int error = 0; |
| 415 | |
| 416 | switch (VTOFDESC(vp)->fd_type) { |
| 417 | case Froot: |
| 418 | case Fdevfd: |
| 419 | case Flink: |
| 420 | case Fctty: |
| 421 | vattr_null(vap); |
| 422 | vap->va_fileid = VTOFDESC(vp)->fd_ix; |
| 423 | |
| 424 | #define R_ALL (S_IRUSR|S_IRGRP|S_IROTH) |
| 425 | #define W_ALL (S_IWUSR|S_IWGRP|S_IWOTH) |
| 426 | #define X_ALL (S_IXUSR|S_IXGRP|S_IXOTH) |
| 427 | |
| 428 | switch (VTOFDESC(vp)->fd_type) { |
| 429 | case Flink: |
| 430 | vap->va_mode = R_ALL|X_ALL; |
| 431 | vap->va_type = VLNK; |
| 432 | vap->va_rdev = 0; |
| 433 | vap->va_nlink = 1; |
| 434 | vap->va_size = strlen(VTOFDESC(vp)->fd_link); |
| 435 | break; |
| 436 | |
| 437 | case Fctty: |
| 438 | vap->va_mode = R_ALL|W_ALL; |
| 439 | vap->va_type = VCHR; |
| 440 | vap->va_rdev = devctty; |
| 441 | vap->va_nlink = 1; |
| 442 | vap->va_size = 0; |
| 443 | break; |
| 444 | |
| 445 | default: |
| 446 | vap->va_mode = R_ALL|X_ALL; |
| 447 | vap->va_type = VDIR; |
| 448 | vap->va_rdev = 0; |
| 449 | vap->va_nlink = 2; |
| 450 | vap->va_size = DEV_BSIZE; |
| 451 | break; |
| 452 | } |
| 453 | vap->va_uid = 0; |
| 454 | vap->va_gid = 0; |
| 455 | vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; |
| 456 | vap->va_blocksize = DEV_BSIZE; |
| 457 | vap->va_atime.tv_sec = boottime.tv_sec; |
| 458 | vap->va_atime.tv_nsec = 0; |
| 459 | vap->va_mtime = vap->va_atime; |
| 460 | vap->va_ctime = vap->va_mtime; |
| 461 | vap->va_gen = 0; |
| 462 | vap->va_flags = 0; |
| 463 | vap->va_bytes = 0; |
| 464 | break; |
| 465 | |
| 466 | case Fdesc: |
| 467 | fd = VTOFDESC(vp)->fd_fd; |
| 468 | error = fdesc_attr(fd, vap, ap->a_cred); |
| 469 | break; |
| 470 | |
| 471 | default: |
| 472 | panic("fdesc_getattr" ); |
| 473 | break; |
| 474 | } |
| 475 | |
| 476 | if (error == 0) |
| 477 | vp->v_type = vap->va_type; |
| 478 | |
| 479 | return (error); |
| 480 | } |
| 481 | |
| 482 | int |
| 483 | fdesc_setattr(void *v) |
| 484 | { |
| 485 | struct vop_setattr_args /* { |
| 486 | struct vnode *a_vp; |
| 487 | struct vattr *a_vap; |
| 488 | kauth_cred_t a_cred; |
| 489 | } */ *ap = v; |
| 490 | file_t *fp; |
| 491 | unsigned fd; |
| 492 | |
| 493 | /* |
| 494 | * Can't mess with the root vnode |
| 495 | */ |
| 496 | switch (VTOFDESC(ap->a_vp)->fd_type) { |
| 497 | case Fdesc: |
| 498 | break; |
| 499 | |
| 500 | case Fctty: |
| 501 | return (0); |
| 502 | |
| 503 | default: |
| 504 | return (EACCES); |
| 505 | } |
| 506 | |
| 507 | fd = VTOFDESC(ap->a_vp)->fd_fd; |
| 508 | if ((fp = fd_getfile(fd)) == NULL) |
| 509 | return (EBADF); |
| 510 | |
| 511 | /* |
| 512 | * XXX: Can't reasonably set the attr's on any types currently. |
| 513 | * On vnode's this will cause truncation and socket/pipes make |
| 514 | * no sense. |
| 515 | */ |
| 516 | fd_putfile(fd); |
| 517 | return (0); |
| 518 | } |
| 519 | |
| 520 | |
| 521 | struct fdesc_target { |
| 522 | ino_t ft_fileno; |
| 523 | u_char ft_type; |
| 524 | u_char ft_namlen; |
| 525 | const char *ft_name; |
| 526 | } fdesc_targets[] = { |
| 527 | #define N(s) sizeof(s)-1, s |
| 528 | { FD_DEVFD, DT_DIR, N("fd" ) }, |
| 529 | { FD_STDIN, DT_LNK, N("stdin" ) }, |
| 530 | { FD_STDOUT, DT_LNK, N("stdout" ) }, |
| 531 | { FD_STDERR, DT_LNK, N("stderr" ) }, |
| 532 | { FD_CTTY, DT_UNKNOWN, N("tty" ) }, |
| 533 | #undef N |
| 534 | #define UIO_MX _DIRENT_RECLEN((struct dirent *)NULL, sizeof("stderr") - 1) |
| 535 | }; |
| 536 | static int nfdesc_targets = sizeof(fdesc_targets) / sizeof(fdesc_targets[0]); |
| 537 | |
| 538 | int |
| 539 | fdesc_readdir(void *v) |
| 540 | { |
| 541 | struct vop_readdir_args /* { |
| 542 | struct vnode *a_vp; |
| 543 | struct uio *a_uio; |
| 544 | kauth_cred_t a_cred; |
| 545 | int *a_eofflag; |
| 546 | off_t **a_cookies; |
| 547 | int *a_ncookies; |
| 548 | } */ *ap = v; |
| 549 | struct uio *uio = ap->a_uio; |
| 550 | struct dirent d; |
| 551 | off_t i; |
| 552 | int j; |
| 553 | int error; |
| 554 | off_t *cookies = NULL; |
| 555 | int ncookies; |
| 556 | fdtab_t *dt; |
| 557 | |
| 558 | switch (VTOFDESC(ap->a_vp)->fd_type) { |
| 559 | case Fctty: |
| 560 | return 0; |
| 561 | |
| 562 | case Fdesc: |
| 563 | return ENOTDIR; |
| 564 | |
| 565 | default: |
| 566 | break; |
| 567 | } |
| 568 | |
| 569 | dt = curlwp->l_fd->fd_dt; |
| 570 | |
| 571 | if (uio->uio_resid < UIO_MX) |
| 572 | return EINVAL; |
| 573 | if (uio->uio_offset < 0) |
| 574 | return EINVAL; |
| 575 | |
| 576 | error = 0; |
| 577 | i = uio->uio_offset; |
| 578 | (void)memset(&d, 0, UIO_MX); |
| 579 | d.d_reclen = UIO_MX; |
| 580 | if (ap->a_ncookies) |
| 581 | ncookies = uio->uio_resid / UIO_MX; |
| 582 | else |
| 583 | ncookies = 0; |
| 584 | |
| 585 | if (VTOFDESC(ap->a_vp)->fd_type == Froot) { |
| 586 | struct fdesc_target *ft; |
| 587 | |
| 588 | if (i >= nfdesc_targets) |
| 589 | return 0; |
| 590 | |
| 591 | if (ap->a_ncookies) { |
| 592 | ncookies = min(ncookies, (nfdesc_targets - i)); |
| 593 | cookies = malloc(ncookies * sizeof(off_t), |
| 594 | M_TEMP, M_WAITOK); |
| 595 | *ap->a_cookies = cookies; |
| 596 | *ap->a_ncookies = ncookies; |
| 597 | } |
| 598 | |
| 599 | for (ft = &fdesc_targets[i]; uio->uio_resid >= UIO_MX && |
| 600 | i < nfdesc_targets; ft++, i++) { |
| 601 | switch (ft->ft_fileno) { |
| 602 | case FD_CTTY: |
| 603 | if (cttyvp(curproc) == NULL) |
| 604 | continue; |
| 605 | break; |
| 606 | |
| 607 | case FD_STDIN: |
| 608 | case FD_STDOUT: |
| 609 | case FD_STDERR: |
| 610 | if ((ft->ft_fileno - FD_STDIN) >= |
| 611 | dt->dt_nfiles) |
| 612 | continue; |
| 613 | if (dt->dt_ff[ft->ft_fileno - FD_STDIN] |
| 614 | == NULL || dt->dt_ff[ft->ft_fileno - |
| 615 | FD_STDIN]->ff_file == NULL) |
| 616 | continue; |
| 617 | break; |
| 618 | } |
| 619 | |
| 620 | d.d_fileno = ft->ft_fileno; |
| 621 | d.d_namlen = ft->ft_namlen; |
| 622 | (void)memcpy(d.d_name, ft->ft_name, ft->ft_namlen + 1); |
| 623 | d.d_type = ft->ft_type; |
| 624 | |
| 625 | if ((error = uiomove(&d, UIO_MX, uio)) != 0) |
| 626 | break; |
| 627 | if (cookies) |
| 628 | *cookies++ = i + 1; |
| 629 | } |
| 630 | } else { |
| 631 | membar_consumer(); |
| 632 | if (ap->a_ncookies) { |
| 633 | ncookies = min(ncookies, dt->dt_nfiles + 2); |
| 634 | cookies = malloc(ncookies * sizeof(off_t), |
| 635 | M_TEMP, M_WAITOK); |
| 636 | *ap->a_cookies = cookies; |
| 637 | *ap->a_ncookies = ncookies; |
| 638 | } |
| 639 | for (; i - 2 < dt->dt_nfiles && uio->uio_resid >= UIO_MX; i++) { |
| 640 | switch (i) { |
| 641 | case 0: |
| 642 | case 1: |
| 643 | d.d_fileno = FD_ROOT; /* XXX */ |
| 644 | d.d_namlen = i + 1; |
| 645 | (void)memcpy(d.d_name, ".." , d.d_namlen); |
| 646 | d.d_name[i + 1] = '\0'; |
| 647 | d.d_type = DT_DIR; |
| 648 | break; |
| 649 | |
| 650 | default: |
| 651 | j = (int)i - 2; |
| 652 | if (dt->dt_ff[j] == NULL || |
| 653 | dt->dt_ff[j]->ff_file == NULL) |
| 654 | continue; |
| 655 | d.d_fileno = j + FD_STDIN; |
| 656 | d.d_namlen = snprintf(d.d_name, |
| 657 | sizeof(d.d_name), "%d" , j); |
| 658 | d.d_type = DT_UNKNOWN; |
| 659 | break; |
| 660 | } |
| 661 | |
| 662 | if ((error = uiomove(&d, UIO_MX, uio)) != 0) |
| 663 | break; |
| 664 | if (cookies) |
| 665 | *cookies++ = i + 1; |
| 666 | } |
| 667 | } |
| 668 | |
| 669 | if (ap->a_ncookies && error) { |
| 670 | free(*ap->a_cookies, M_TEMP); |
| 671 | *ap->a_ncookies = 0; |
| 672 | *ap->a_cookies = NULL; |
| 673 | } |
| 674 | |
| 675 | uio->uio_offset = i; |
| 676 | return error; |
| 677 | } |
| 678 | |
| 679 | int |
| 680 | fdesc_readlink(void *v) |
| 681 | { |
| 682 | struct vop_readlink_args /* { |
| 683 | struct vnode *a_vp; |
| 684 | struct uio *a_uio; |
| 685 | kauth_cred_t a_cred; |
| 686 | } */ *ap = v; |
| 687 | struct vnode *vp = ap->a_vp; |
| 688 | int error; |
| 689 | |
| 690 | if (vp->v_type != VLNK) |
| 691 | return (EPERM); |
| 692 | |
| 693 | if (VTOFDESC(vp)->fd_type == Flink) { |
| 694 | const char *ln = VTOFDESC(vp)->fd_link; |
| 695 | error = uiomove(__UNCONST(ln), strlen(ln), ap->a_uio); |
| 696 | } else { |
| 697 | error = EOPNOTSUPP; |
| 698 | } |
| 699 | |
| 700 | return (error); |
| 701 | } |
| 702 | |
| 703 | int |
| 704 | fdesc_read(void *v) |
| 705 | { |
| 706 | struct vop_read_args /* { |
| 707 | struct vnode *a_vp; |
| 708 | struct uio *a_uio; |
| 709 | int a_ioflag; |
| 710 | kauth_cred_t a_cred; |
| 711 | } */ *ap = v; |
| 712 | int error = EOPNOTSUPP; |
| 713 | struct vnode *vp = ap->a_vp; |
| 714 | |
| 715 | switch (VTOFDESC(vp)->fd_type) { |
| 716 | case Fctty: |
| 717 | VOP_UNLOCK(vp); |
| 718 | error = cdev_read(devctty, ap->a_uio, ap->a_ioflag); |
| 719 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 720 | break; |
| 721 | |
| 722 | default: |
| 723 | error = EOPNOTSUPP; |
| 724 | break; |
| 725 | } |
| 726 | |
| 727 | return (error); |
| 728 | } |
| 729 | |
| 730 | int |
| 731 | fdesc_write(void *v) |
| 732 | { |
| 733 | struct vop_write_args /* { |
| 734 | struct vnode *a_vp; |
| 735 | struct uio *a_uio; |
| 736 | int a_ioflag; |
| 737 | kauth_cred_t a_cred; |
| 738 | } */ *ap = v; |
| 739 | int error = EOPNOTSUPP; |
| 740 | struct vnode *vp = ap->a_vp; |
| 741 | |
| 742 | switch (VTOFDESC(vp)->fd_type) { |
| 743 | case Fctty: |
| 744 | VOP_UNLOCK(vp); |
| 745 | error = cdev_write(devctty, ap->a_uio, ap->a_ioflag); |
| 746 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 747 | break; |
| 748 | |
| 749 | default: |
| 750 | error = EOPNOTSUPP; |
| 751 | break; |
| 752 | } |
| 753 | |
| 754 | return (error); |
| 755 | } |
| 756 | |
| 757 | int |
| 758 | fdesc_ioctl(void *v) |
| 759 | { |
| 760 | struct vop_ioctl_args /* { |
| 761 | struct vnode *a_vp; |
| 762 | u_long a_command; |
| 763 | void *a_data; |
| 764 | int a_fflag; |
| 765 | kauth_cred_t a_cred; |
| 766 | } */ *ap = v; |
| 767 | int error = EOPNOTSUPP; |
| 768 | |
| 769 | switch (VTOFDESC(ap->a_vp)->fd_type) { |
| 770 | case Fctty: |
| 771 | error = cdev_ioctl(devctty, ap->a_command, ap->a_data, |
| 772 | ap->a_fflag, curlwp); |
| 773 | break; |
| 774 | |
| 775 | default: |
| 776 | error = EOPNOTSUPP; |
| 777 | break; |
| 778 | } |
| 779 | |
| 780 | return (error); |
| 781 | } |
| 782 | |
| 783 | int |
| 784 | fdesc_poll(void *v) |
| 785 | { |
| 786 | struct vop_poll_args /* { |
| 787 | struct vnode *a_vp; |
| 788 | int a_events; |
| 789 | } */ *ap = v; |
| 790 | int revents; |
| 791 | |
| 792 | switch (VTOFDESC(ap->a_vp)->fd_type) { |
| 793 | case Fctty: |
| 794 | revents = cdev_poll(devctty, ap->a_events, curlwp); |
| 795 | break; |
| 796 | |
| 797 | default: |
| 798 | revents = genfs_poll(v); |
| 799 | break; |
| 800 | } |
| 801 | |
| 802 | return (revents); |
| 803 | } |
| 804 | |
| 805 | int |
| 806 | fdesc_kqfilter(void *v) |
| 807 | { |
| 808 | struct vop_kqfilter_args /* { |
| 809 | struct vnode *a_vp; |
| 810 | struct knote *a_kn; |
| 811 | } */ *ap = v; |
| 812 | int error, fd; |
| 813 | file_t *fp; |
| 814 | |
| 815 | switch (VTOFDESC(ap->a_vp)->fd_type) { |
| 816 | case Fctty: |
| 817 | error = cdev_kqfilter(devctty, ap->a_kn); |
| 818 | break; |
| 819 | |
| 820 | case Fdesc: |
| 821 | /* just invoke kqfilter for the underlying descriptor */ |
| 822 | fd = VTOFDESC(ap->a_vp)->fd_fd; |
| 823 | if ((fp = fd_getfile(fd)) == NULL) |
| 824 | return (1); |
| 825 | error = (*fp->f_ops->fo_kqfilter)(fp, ap->a_kn); |
| 826 | fd_putfile(fd); |
| 827 | break; |
| 828 | |
| 829 | default: |
| 830 | return (genfs_kqfilter(v)); |
| 831 | } |
| 832 | |
| 833 | return (error); |
| 834 | } |
| 835 | |
| 836 | int |
| 837 | fdesc_inactive(void *v) |
| 838 | { |
| 839 | struct vop_inactive_args /* { |
| 840 | struct vnode *a_vp; |
| 841 | } */ *ap = v; |
| 842 | struct vnode *vp = ap->a_vp; |
| 843 | struct fdescnode *fd = VTOFDESC(vp); |
| 844 | |
| 845 | /* |
| 846 | * Clear out the v_type field to avoid |
| 847 | * nasty things happening on reclaim. |
| 848 | */ |
| 849 | if (fd->fd_type == Fctty || fd->fd_type == Fdesc) |
| 850 | vp->v_type = VNON; |
| 851 | VOP_UNLOCK(vp); |
| 852 | return (0); |
| 853 | } |
| 854 | |
| 855 | int |
| 856 | fdesc_reclaim(void *v) |
| 857 | { |
| 858 | struct vop_reclaim_args /* { |
| 859 | struct vnode *a_vp; |
| 860 | } */ *ap = v; |
| 861 | struct vnode *vp = ap->a_vp; |
| 862 | struct fdescnode *fd = VTOFDESC(vp); |
| 863 | |
| 864 | vp->v_data = NULL; |
| 865 | kmem_free(fd, sizeof(struct fdescnode)); |
| 866 | |
| 867 | return (0); |
| 868 | } |
| 869 | |
| 870 | /* |
| 871 | * Return POSIX pathconf information applicable to special devices. |
| 872 | */ |
| 873 | int |
| 874 | fdesc_pathconf(void *v) |
| 875 | { |
| 876 | struct vop_pathconf_args /* { |
| 877 | struct vnode *a_vp; |
| 878 | int a_name; |
| 879 | register_t *a_retval; |
| 880 | } */ *ap = v; |
| 881 | |
| 882 | switch (ap->a_name) { |
| 883 | case _PC_LINK_MAX: |
| 884 | *ap->a_retval = LINK_MAX; |
| 885 | return (0); |
| 886 | case _PC_MAX_CANON: |
| 887 | *ap->a_retval = MAX_CANON; |
| 888 | return (0); |
| 889 | case _PC_MAX_INPUT: |
| 890 | *ap->a_retval = MAX_INPUT; |
| 891 | return (0); |
| 892 | case _PC_PIPE_BUF: |
| 893 | *ap->a_retval = PIPE_BUF; |
| 894 | return (0); |
| 895 | case _PC_CHOWN_RESTRICTED: |
| 896 | *ap->a_retval = 1; |
| 897 | return (0); |
| 898 | case _PC_VDISABLE: |
| 899 | *ap->a_retval = _POSIX_VDISABLE; |
| 900 | return (0); |
| 901 | case _PC_SYNC_IO: |
| 902 | *ap->a_retval = 1; |
| 903 | return (0); |
| 904 | default: |
| 905 | return (EINVAL); |
| 906 | } |
| 907 | /* NOTREACHED */ |
| 908 | } |
| 909 | |
| 910 | /* |
| 911 | * Print out the contents of a /dev/fd vnode. |
| 912 | */ |
| 913 | /* ARGSUSED */ |
| 914 | int |
| 915 | fdesc_print(void *v) |
| 916 | { |
| 917 | printf("tag VT_NON, fdesc vnode\n" ); |
| 918 | return (0); |
| 919 | } |
| 920 | |
| 921 | int |
| 922 | fdesc_link(void *v) |
| 923 | { |
| 924 | struct vop_link_v2_args /* { |
| 925 | struct vnode *a_dvp; |
| 926 | struct vnode *a_vp; |
| 927 | struct componentname *a_cnp; |
| 928 | } */ *ap = v; |
| 929 | |
| 930 | VOP_ABORTOP(ap->a_dvp, ap->a_cnp); |
| 931 | return (EROFS); |
| 932 | } |
| 933 | |
| 934 | int |
| 935 | fdesc_symlink(void *v) |
| 936 | { |
| 937 | struct vop_symlink_v3_args /* { |
| 938 | struct vnode *a_dvp; |
| 939 | struct vnode **a_vpp; |
| 940 | struct componentname *a_cnp; |
| 941 | struct vattr *a_vap; |
| 942 | char *a_target; |
| 943 | } */ *ap = v; |
| 944 | |
| 945 | VOP_ABORTOP(ap->a_dvp, ap->a_cnp); |
| 946 | return (EROFS); |
| 947 | } |
| 948 | |