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 * 35 * @(#)opendir.c 8.8 (Berkeley) 5/1/95 36 */ 37 38 #include "namespace.h" 39 #include <sys/param.h> 40 #include <sys/stat.h> 41 42 #include <dirent.h> 43 #include <errno.h> 44 #include <fcntl.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 #include "un-namespace.h" 49 50 #include "gen_private.h" 51 52 #define DEFAULT_FLAGS (DTF_HIDEW | DTF_NODUP) 53 54 /* 55 * Open a directory given its path. 56 */ 57 DIR * 58 opendir(const char *name) 59 { 60 return (__opendir2(name, DEFAULT_FLAGS)); 61 } 62 63 /* 64 * Open a directory given a descriptor representing it. 65 */ 66 DIR * 67 fdopendir(int fd) 68 { 69 return (__fdopendir2(fd, DEFAULT_FLAGS)); 70 } 71 72 DIR * 73 __opendir2(const char *name, int flags) 74 { 75 int fd; 76 struct stat statb; 77 DIR *dirp; 78 int saved_errno; 79 80 /* 81 * stat() before _open() because opening of special files may be 82 * harmful. 83 */ 84 if (stat(name, &statb) != 0) 85 return (NULL); 86 87 fd = _open(name, O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC); 88 if (fd == -1) 89 return (NULL); 90 dirp = __fdopendir2(fd, flags); 91 if (dirp == NULL) { 92 saved_errno = errno; 93 _close(fd); 94 errno = saved_errno; 95 } 96 97 return (dirp); 98 } 99 100 DIR * 101 __fdopendir2(int fd, int flags) 102 { 103 DIR *dirp; 104 int incr; 105 int saved_errno; 106 struct stat statb; 107 108 dirp = NULL; 109 110 if (_fstat(fd, &statb) != 0) 111 goto fail; 112 if (!S_ISDIR(statb.st_mode)) { 113 errno = ENOTDIR; 114 goto fail; 115 } 116 if (_fcntl(fd, F_SETFD, FD_CLOEXEC) == -1 || 117 (dirp = malloc(sizeof(DIR))) == NULL) 118 goto fail; 119 120 /* 121 * Use the system page size if that is a multiple of DIRBLKSIZ. 122 * Hopefully this can be a big win someday by allowing page 123 * trades to user space to be done by _getdirentries(). 124 */ 125 incr = getpagesize(); 126 if ((incr % DIRBLKSIZ) != 0) 127 incr = DIRBLKSIZ; 128 129 dirp->dd_len = incr; 130 dirp->dd_buf = malloc(dirp->dd_len); 131 if (dirp->dd_buf == NULL) 132 goto fail; 133 flags &= ~DTF_REWIND; 134 135 dirp->dd_loc = 0; 136 dirp->dd_fd = fd; 137 dirp->dd_flags = flags; 138 dirp->dd_lock = NULL; 139 140 /* 141 * Set up seek point for rewinddir. 142 */ 143 dirp->dd_seek = 0; 144 dirp->dd_rewind = telldir(dirp); 145 146 /* 147 * The file offset of the fd passed to fdopendir() determines the 148 * initial entry returned by readdir(). Save this offset so that 149 * telldir() right after fdopendir() returns a value pointing to this 150 * initial entry. 151 * We don't have to worry about misaligned file offsets. The kernel 152 * deals with these. 153 */ 154 if ((dirp->dd_seek = lseek(fd, 0, SEEK_CUR)) < 0) 155 goto fail; 156 157 return (dirp); 158 159 fail: 160 saved_errno = errno; 161 if (dirp != NULL) { 162 _reclaim_telldir(dirp); 163 free(dirp->dd_buf); 164 } 165 free(dirp); 166 errno = saved_errno; 167 return (NULL); 168 } 169