/*

 * 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 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include "lint.h"

#include <mtlib.h>

#include <sys/types.h>

#include <synch.h>

#include <thread.h>

#include <pthread.h>

#include "libc.h"

/*

 * fork1-safety.

 * These three routines were used to make some libc interfaces fork1-safe.

 * With the merge of libthread into libc, almost all libc internal-only

 * locks are acquired via lmutex_lock() or lrw_rdlock()/lrw_wrlock(),

 * which makes them automatically fork1-safe (as well as async-signal

 * safe), so these functions are now used only for the locks that cannot

 * be used with lmutex_lock or lrw_rdlock()/lrw_wrlock().

 */

extern void atexit_locks(void);

extern void atexit_unlocks(void);

extern void stdio_locks(void);

extern void stdio_unlocks(void);

extern void malloc_locks(void);

extern void malloc_unlocks(void);

static void

libc_prepare_atfork(void)

{

	atexit_locks();

	stdio_locks();

	malloc_locks();

}

static void

libc_child_atfork(void)

{

	malloc_unlocks();

	stdio_unlocks();

	atexit_unlocks();

}

static void

libc_parent_atfork(void)

{

	malloc_unlocks();

	stdio_unlocks();

	atexit_unlocks();

}

/* called from libc_init() */

void

atfork_init(void)

{

	(void) pthread_atfork(libc_prepare_atfork,

	    libc_parent_atfork, libc_child_atfork);

}