| | 1 | /* |
| | 2 | * Copyright (c) 1983, 1993 |
| | 3 | * The Regents of the University of California. All rights reserved. |
| | 4 | * |
| | 5 | * Redistribution and use in source and binary forms, with or without |
| | 6 | * modification, are permitted provided that the following conditions |
| | 7 | * are met: |
| | 8 | * 1. Redistributions of source code must retain the above copyright |
| | 9 | * notice, this list of conditions and the following disclaimer. |
| | 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 11 | * notice, this list of conditions and the following disclaimer in the |
| | 12 | * documentation and/or other materials provided with the distribution. |
| | 13 | * 3. All advertising materials mentioning features or use of this software |
| | 14 | * must display the following acknowledgement: |
| | 15 | * This product includes software developed by the University of |
| | 16 | * California, Berkeley and its contributors. |
| | 17 | * 4. Neither the name of the University nor the names of its contributors |
| | 18 | * may be used to endorse or promote products derived from this software |
| | 19 | * without specific prior written permission. |
| | 20 | * |
| | 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 31 | * SUCH DAMAGE. |
| | 32 | * |
| | 33 | * $FreeBSD: src/lib/libc/gen/opendir.c,v 1.10.2.1 2001/06/04 20:59:48 joerg Exp $ |
| | 34 | * $DragonFly: src/lib/libc/gen/opendir.c,v 1.6 2005/11/13 00:07:42 swildner Exp $ |
| | 35 | * |
| | 36 | * @(#)opendir.c 8.8 (Berkeley) 5/1/95 |
| | 37 | */ |
| | 38 | |
| | 39 | #include "namespace.h" |
| | 40 | #include <sys/param.h> |
| | 41 | #include <sys/stat.h> |
| | 42 | |
| | 43 | #include <dirent.h> |
| | 44 | #include <errno.h> |
| | 45 | #include <fcntl.h> |
| | 46 | #include <stdlib.h> |
| | 47 | #include <string.h> |
| | 48 | #include <unistd.h> |
| | 49 | #include "un-namespace.h" |
| | 50 | |
| | 51 | /* |
| | 52 | * Open a directory. |
| | 53 | */ |
| | 54 | DIR * |
| | 55 | opendir(const char *name) |
| | 56 | { |
| | 57 | return (__opendir2(name, DTF_HIDEW|DTF_NODUP)); |
| | 58 | } |
| | 59 | |
| | 60 | DIR * |
| | 61 | __opendir2(const char *name, int flags) |
| | 62 | { |
| | 63 | DIR *dirp; |
| | 64 | int fd; |
| | 65 | int incr; |
| | 66 | int saved_errno; |
| | 67 | struct stat statb; |
| | 68 | |
| | 69 | /* |
| | 70 | * stat() before _open() because opening of special files may be |
| | 71 | * harmful. _fstat() after open because the file may have changed. |
| | 72 | */ |
| | 73 | if (stat(name, &statb) != 0) |
| | 74 | return (NULL); |
| | 75 | if (!S_ISDIR(statb.st_mode)) { |
| | 76 | errno = ENOTDIR; |
| | 77 | return (NULL); |
| | 78 | } |
| | 79 | if ((fd = _open(name, O_RDONLY | O_NONBLOCK)) == -1) |
| | 80 | return (NULL); |
| | 81 | dirp = NULL; |
| | 82 | if (_fstat(fd, &statb) != 0) |
| | 83 | goto fail; |
| | 84 | if (!S_ISDIR(statb.st_mode)) { |
| | 85 | errno = ENOTDIR; |
| | 86 | goto fail; |
| | 87 | } |
| | 88 | if (_fcntl(fd, F_SETFD, FD_CLOEXEC) == -1 || |
| | 89 | (dirp = malloc(sizeof(DIR))) == NULL) |
| | 90 | goto fail; |
| | 91 | |
| | 92 | /* |
| | 93 | * Use the system page size if that is a multiple of DIRBLKSIZ. |
| | 94 | * Hopefully this can be a big win someday by allowing page |
| | 95 | * trades to user space to be done by _getdirentries(). |
| | 96 | */ |
| | 97 | incr = getpagesize(); |
| | 98 | if ((incr % DIRBLKSIZ) != 0) |
| | 99 | incr = DIRBLKSIZ; |
| | 100 | |
| | 101 | dirp->dd_len = incr; |
| | 102 | dirp->dd_buf = malloc(dirp->dd_len); |
| | 103 | if (dirp->dd_buf == NULL) |
| | 104 | goto fail; |
| | 105 | dirp->dd_seek = 0; |
| | 106 | flags &= ~DTF_REWIND; |
| | 107 | |
| | 108 | dirp->dd_loc = 0; |
| | 109 | dirp->dd_fd = fd; |
| | 110 | dirp->dd_flags = flags; |
| | 111 | dirp->dd_lock = NULL; |
| | 112 | |
| | 113 | /* |
| | 114 | * Set up seek point for rewinddir. |
| | 115 | */ |
| | 116 | dirp->dd_rewind = telldir(dirp); |
| | 117 | |
| | 118 | return (dirp); |
| | 119 | |
| | 120 | fail: |
| | 121 | saved_errno = errno; |
| | 122 | free(dirp); |
| | 123 | _close(fd); |
| | 124 | errno = saved_errno; |
| | 125 | return (NULL); |
| | 126 | } |
projects / dragonfly.git / blame_incremental