rewinddir.c revision 270002 
1/*-
2 * Copyright (c) 1990, 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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)rewinddir.c	8.1 (Berkeley) 6/8/93";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: stable/10/lib/libc/gen/rewinddir.c 270002 2014-08-14 20:20:21Z jhb $");
35
36#include "namespace.h"
37#include <sys/types.h>
38#include <dirent.h>
39#include <pthread.h>
40#include <unistd.h>
41#include "un-namespace.h"
42
43#include "libc_private.h"
44#include "gen-private.h"
45#include "telldir.h"
46
47void
48rewinddir(dirp)
49	DIR *dirp;
50{
51
52	if (__isthreaded)
53		_pthread_mutex_lock(&dirp->dd_lock);
54	if (dirp->dd_flags & __DTF_READALL)
55		_filldir(dirp, false);
56	else if (dirp->dd_seek != 0) {
57		(void) lseek(dirp->dd_fd, 0, SEEK_SET);
58		dirp->dd_seek = 0;
59	}
60	dirp->dd_loc = 0;
61	_reclaim_telldir(dirp);
62	if (__isthreaded)
63		_pthread_mutex_unlock(&dirp->dd_lock);
64}
65