2N/A/*
2N/A * CDDL HEADER START
2N/A *
2N/A * The contents of this file are subject to the terms of the
2N/A * Common Development and Distribution License (the "License").
2N/A * You may not use this file except in compliance with the License.
2N/A *
2N/A * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
2N/A * or http://www.opensolaris.org/os/licensing.
2N/A * See the License for the specific language governing permissions
2N/A * and limitations under the License.
2N/A *
2N/A * When distributing Covered Code, include this CDDL HEADER in each
2N/A * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
2N/A * If applicable, add the following below this CDDL HEADER, with the
2N/A * fields enclosed by brackets "[]" replaced with your own identifying
2N/A * information: Portions Copyright [yyyy] [name of copyright owner]
2N/A *
2N/A * CDDL HEADER END
2N/A */
2N/A
2N/A/*
2N/A * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
2N/A * Use is subject to license terms.
2N/A */
2N/A
2N/A/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
2N/A/* All Rights Reserved */
2N/A
2N/A#pragma ident "%Z%%M% %I% %E% SMI"
2N/A
2N/A#include "lint.h"
2N/A#include "mtlib.h"
2N/A#include "file64.h"
2N/A#include <stdio.h>
2N/A#include <thread.h>
2N/A#include <synch.h>
2N/A#include <stdlib.h>
2N/A#include <errno.h>
2N/A#include <stdio_ext.h>
2N/A#include "stdiom.h"
2N/A
2N/A#define _iob __iob
2N/A
2N/A/*
2N/A * _flockget and _flockrel are only called by the
2N/A * FLOCKFILE/FUNLOCKFILE macros in mtlib.h.
2N/A */
2N/A
2N/A/*
2N/A * compute the lock's position, acquire it and return its pointer
2N/A */
2N/A
2N/Armutex_t *
2N/A_flockget(FILE *iop)
2N/A{
2N/A rmutex_t *rl = IOB_LCK(iop);
2N/A
2N/A if (rl != NULL)
2N/A cancel_safe_mutex_lock(rl);
2N/A return (rl);
2N/A}
2N/A
2N/Aint
2N/Aftrylockfile(FILE *iop)
2N/A{
2N/A rmutex_t *rl = IOB_LCK(iop);
2N/A
2N/A if (rl != NULL)
2N/A return (mutex_trylock(rl));
2N/A return (0); /* can't happen? */
2N/A}
2N/A
2N/Avoid
2N/Aflockfile(FILE *iop)
2N/A{
2N/A rmutex_t *rl = IOB_LCK(iop);
2N/A
2N/A if (rl != NULL)
2N/A (void) mutex_lock(rl);
2N/A}
2N/A
2N/Avoid
2N/Afunlockfile(FILE *iop)
2N/A{
2N/A rmutex_t *rl = IOB_LCK(iop);
2N/A
2N/A if (rl != NULL)
2N/A (void) mutex_unlock(rl);
2N/A}
2N/A
2N/Aint
2N/A__fsetlocking(FILE *iop, int type)
2N/A{
2N/A int ret = 0;
2N/A
2N/A ret = GET_IONOLOCK(iop) ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL;
2N/A
2N/A switch (type) {
2N/A
2N/A case FSETLOCKING_QUERY:
2N/A break;
2N/A
2N/A case FSETLOCKING_INTERNAL:
2N/A CLEAR_IONOLOCK(iop);
2N/A break;
2N/A
2N/A case FSETLOCKING_BYCALLER:
2N/A SET_IONOLOCK(iop);
2N/A break;
2N/A
2N/A default:
2N/A errno = EINVAL;
2N/A return (-1);
2N/A }
2N/A
2N/A return (ret);
2N/A}