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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
#pragma weak flockfile = _flockfile
#pragma weak ftrylockfile = _ftrylockfile
#pragma weak funlockfile = _funlockfile
#include "synonyms.h"
#include "mtlib.h"
#define _iob __iob
#include "file64.h"
#include <stdio.h>
#include <thread.h>
#include <synch.h>
#include <stdlib.h>
#include <errno.h>
#include <stdio_ext.h>
#include "stdiom.h"
/*
* The rmutex_lock/unlock routines are only called (for stdio FILE
* locking in libc) by _flockget, _flockrel, flockfile, ftrylockfile,
* and funlockfile. _flockget and _flockrel are only called by the
* FLOCKFILE/FUNLOCKFILE macros in mtlib.h. rmutex_trylock(), as a
* special case, is called from GETIOP()/getiop() in _findiop().
*/
/*
* compute the lock's position, acquire it and return its pointer
*/
rmutex_t *
_flockget(FILE *iop)
{
rmutex_t *rl = IOB_LCK(iop);
if (rl != NULL)
rmutex_lock(rl);
return (rl);
}
int
ftrylockfile(FILE *iop)
{
rmutex_t *rl = IOB_LCK(iop);
if (rl != NULL)
return (rmutex_trylock(rl));
return (0); /* can't happen? */
}
void
flockfile(FILE *iop)
{
rmutex_t *rl = IOB_LCK(iop);
if (rl != NULL)
rmutex_lock(rl);
}
void
funlockfile(FILE *iop)
{
rmutex_t *rl = IOB_LCK(iop);
if (rl != NULL)
rmutex_unlock(rl);
}
int
__fsetlocking(FILE *iop, int type)
{
int ret = 0;
ret = GET_IONOLOCK(iop) ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL;
switch (type) {
case FSETLOCKING_QUERY:
break;
case FSETLOCKING_INTERNAL:
CLEAR_IONOLOCK(iop);
break;
case FSETLOCKING_BYCALLER:
SET_IONOLOCK(iop);
break;
default:
errno = EINVAL;
return (-1);
}
return (ret);
}
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