/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/types.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <apptrace.h>
#include <assert.h>
#include "abienv.h"

#define NOTID 0xffffffff

/*
 * This file is meant to contain support functions
 * for interceptors.  They are built into the auditing
 * object making the namespace available to "children"
 * objects.
 */

static lwp_mutex_t abi_stdio_mutex = DEFAULTMUTEX;
static volatile thread_t locktid = NOTID;
static volatile int count;

/* Return true on empty */
int
is_empty_string(char const *s)
{
        if (s != NULL && *s != '\0')
                return (0);

        return (1);
}

void
abilock(sigset_t *mask)
{
        thread_t tid;

        if ((*abi_thr_main)() != -1) {
                tid = (*abi_thr_self)();

                if (tid == locktid) {
                        count++;
                } else {
                        (void) _lwp_mutex_lock(&abi_stdio_mutex);
                        (void) sigprocmask(SIG_BLOCK, &abisigset, mask);
                        locktid = tid;
                        count = 1;
                }
        }
}

void
abiunlock(sigset_t *mask)
{
        thread_t tid;

        (void) fflush(ABISTREAM);

        if ((*abi_thr_main)() != -1) {
                tid = (*abi_thr_self)();
                assert(tid == locktid);
                count--;
                if (count <= 0) {
                        count = 0;
                        locktid = NOTID;
                        (void) sigprocmask(SIG_SETMASK, mask, NULL);
                        (void) _lwp_mutex_unlock(&abi_stdio_mutex);
                }
        }
}