2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
33 * $FreeBSD: src/lib/libc/gen/opendir.c,v 1.10.2.1 2001/06/04 20:59:48 joerg Exp $
35 * @(#)opendir.c 8.8 (Berkeley) 5/1/95
38 #include "namespace.h"
39 #include <sys/param.h>
48 #include "un-namespace.h"
50 #include "gen_private.h"
52 #define DEFAULT_FLAGS (DTF_HIDEW | DTF_NODUP)
55 * Open a directory given its path.
58 opendir(const char *name)
60 return (__opendir2(name, DEFAULT_FLAGS));
64 * Open a directory given a descriptor representing it.
69 return (__fdopendir2(fd, DEFAULT_FLAGS));
73 __opendir2(const char *name, int flags)
81 * stat() before _open() because opening of special files may be
84 if (stat(name, &statb) != 0)
87 fd = _open(name, O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC);
90 dirp = __fdopendir2(fd, flags);
101 __fdopendir2(int fd, int flags)
110 if (_fstat(fd, &statb) != 0)
112 if (!S_ISDIR(statb.st_mode)) {
116 if (_fcntl(fd, F_SETFD, FD_CLOEXEC) == -1 ||
117 (dirp = malloc(sizeof(DIR))) == NULL)
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().
125 incr = getpagesize();
126 if ((incr % DIRBLKSIZ) != 0)
130 dirp->dd_buf = malloc(dirp->dd_len);
131 if (dirp->dd_buf == NULL)
133 flags &= ~DTF_REWIND;
137 dirp->dd_flags = flags;
138 dirp->dd_lock = NULL;
141 * Set up seek point for rewinddir.
144 dirp->dd_rewind = telldir(dirp);
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
151 * We don't have to worry about misaligned file offsets. The kernel
154 if ((dirp->dd_seek = lseek(fd, 0, SEEK_CUR)) < 0)
162 _reclaim_telldir(dirp);