xref: /openbsd-src/lib/libc/gen/readdir_r.c (revision f54f769fe431f6590c22d8795b002c3ea2e2d668)

/*	$OpenBSD: readdir_r.c,v 1.6 2013/11/12 20:19:23 deraadt Exp $ */
/*
 * Copyright (c) 1983, 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.
 * 3. 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.
 */

#include <dirent.h>
#include <errno.h>
#include <limits.h>
#include <string.h>
#include "telldir.h"
#include "thread_private.h"

int
readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result)
{
	struct dirent *dp;

	_MUTEX_LOCK(&dirp->dd_lock);
	if (_readdir_unlocked(dirp, &dp) != 0) {
		_MUTEX_UNLOCK(&dirp->dd_lock);
		return errno;
	}
	if (dp != NULL)
		memcpy(entry, dp,
		    sizeof (struct dirent) - NAME_MAX + dp->d_namlen);
	_MUTEX_UNLOCK(&dirp->dd_lock);
	if (dp != NULL)
		*result = entry;
	else
		*result = NULL;
	return 0;
}