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
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9 * notice, this list of conditions and the following disclaimer.
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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.
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28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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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 $
36 * @(#)opendir.c 8.8 (Berkeley) 5/1/95
39 #include "namespace.h"
40 #include <sys/param.h>
49 #include "un-namespace.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)
86 if (!S_ISDIR(statb.st_mode)) {
91 if ((fd = _open(name, O_RDONLY | O_NONBLOCK)) == -1)
93 dirp = __fdopendir2(fd, flags);
104 __fdopendir2(int fd, int flags)
114 if (_fstat(fd, &statb) != 0)
116 if (!S_ISDIR(statb.st_mode)) {
120 if (_fcntl(fd, F_SETFD, FD_CLOEXEC) == -1 ||
121 (dirp = malloc(sizeof(DIR))) == NULL)
125 * XXX We don't support yet the POSIX requirement that states that the
126 * file offset associated with the fd passed to fdopendir() determines
127 * which directory entry is returned.
129 if ((off = lseek(fd, 0, SEEK_CUR)) != 0) {
130 errno = (off != -1) ? ENOTSUP : errno;
135 * Use the system page size if that is a multiple of DIRBLKSIZ.
136 * Hopefully this can be a big win someday by allowing page
137 * trades to user space to be done by _getdirentries().
139 incr = getpagesize();
140 if ((incr % DIRBLKSIZ) != 0)
144 dirp->dd_buf = malloc(dirp->dd_len);
145 if (dirp->dd_buf == NULL)
148 flags &= ~DTF_REWIND;
152 dirp->dd_flags = flags;
153 dirp->dd_lock = NULL;
156 * Set up seek point for rewinddir.
158 dirp->dd_rewind = telldir(dirp);