1 /* $NetBSD: rewinddir.c,v 1.13 2010/09/26 02:26:59 yamt Exp $ */
2
3 /*-
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 #if 0
35 static char sccsid[] = "@(#)rewinddir.c 8.1 (Berkeley) 6/8/93";
36 #else
37 __RCSID("$NetBSD: rewinddir.c,v 1.13 2010/09/26 02:26:59 yamt Exp $");
38 #endif
39 #endif /* LIBC_SCCS and not lint */
40
41 #include "namespace.h"
42 #include "reentrant.h"
43 #include "extern.h"
44 #include <sys/types.h>
45
46 #include <unistd.h>
47 #include <dirent.h>
48
49 #include "dirent_private.h"
50
51 #ifdef __weak_alias
__weak_alias(rewinddir,_rewinddir)52 __weak_alias(rewinddir,_rewinddir)
53 #endif
54
55 void
56 rewinddir(DIR *dirp)
57 {
58 int fd;
59
60 #ifdef _REENTRANT
61 if (__isthreaded) {
62 mutex_lock((mutex_t *)dirp->dd_lock);
63 }
64 #endif
65 fd = dirp->dd_fd;
66 _finidir(dirp);
67 dirp->dd_seek = lseek(fd, (off_t)0, SEEK_SET);
68 _initdir(dirp, fd, NULL);
69 #ifdef _REENTRANT
70 if (__isthreaded) {
71 mutex_unlock((mutex_t *)dirp->dd_lock);
72 }
73 #endif
74 }
75