xref: /freebsd-10.2-release/lib/libc/gen/rewinddir.c

/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)rewinddir.c	8.1 (Berkeley) 6/8/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: stable/10/lib/libc/gen/rewinddir.c 271263 2014-09-08 14:45:58Z jhb $");

#include "namespace.h"
#include <sys/types.h>
#include <dirent.h>
#include <pthread.h>
#include <unistd.h>
#include "un-namespace.h"

#include "libc_private.h"
#include "gen-private.h"
#include "telldir.h"

void
rewinddir(dirp)
	DIR *dirp;
{

	if (__isthreaded)
		_pthread_mutex_lock(&dirp->dd_lock);
	if (dirp->dd_flags & __DTF_READALL)
		_filldir(dirp, false);
	else {
		(void) lseek(dirp->dd_fd, 0, SEEK_SET);
		dirp->dd_seek = 0;
	}
	dirp->dd_loc = 0;
	_reclaim_telldir(dirp);
	if (__isthreaded)
		_pthread_mutex_unlock(&dirp->dd_lock);
}