1 /* $NetBSD: seekdir.c,v 1.15 2013/03/06 11:27:46 yamt Exp $ */
2
3 /*
4 * Copyright (c) 1983, 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[] = "@(#)seekdir.c 8.1 (Berkeley) 6/4/93";
36 #else
37 __RCSID("$NetBSD: seekdir.c,v 1.15 2013/03/06 11:27:46 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/param.h>
45
46 #include <dirent.h>
47
48 #include "dirent_private.h"
49
50 #ifdef __weak_alias
__weak_alias(seekdir,_seekdir)51 __weak_alias(seekdir,_seekdir)
52 #endif
53
54 /*
55 * Seek to an entry in a directory.
56 * _seekdir_unlocked is in telldir.c so that it can share opaque
57 * data structures.
58 */
59 void
60 seekdir(DIR *dirp, long loc)
61 {
62
63 #ifdef _REENTRANT
64 if (__isthreaded) {
65 mutex_lock((mutex_t *)dirp->dd_lock);
66 _seekdir_unlocked(dirp, loc);
67 mutex_unlock((mutex_t *)dirp->dd_lock);
68 } else
69 #endif
70 _seekdir_unlocked(dirp, loc);
71 }
72