minix/lib/libc/gen/seekdir.c

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/* $NetBSD: seekdir.c,v 1.15 2013/03/06 11:27:46 yamt 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 <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)seekdir.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: seekdir.c,v 1.15 2013/03/06 11:27:46 yamt Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include "reentrant.h"
#include "extern.h"
#include <sys/param.h>
#include <dirent.h>
#include "dirent_private.h"
#ifdef __weak_alias
__weak_alias(seekdir,_seekdir)
#endif
/*
* Seek to an entry in a directory.
* _seekdir_unlocked is in telldir.c so that it can share opaque
* data structures.
*/
void
seekdir(DIR *dirp, long loc)
{
#ifdef _REENTRANT
if (__isthreaded) {
mutex_lock((mutex_t *)dirp->dd_lock);
_seekdir_unlocked(dirp, loc);
mutex_unlock((mutex_t *)dirp->dd_lock);
} else
#endif
_seekdir_unlocked(dirp, loc);
}