/* crypto/engine/eng_init.c */

/* ====================================================================

 * Copyright (c) 1999-2001 The OpenSSL Project.  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. All advertising materials mentioning features or use of this

 *    software must display the following acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    licensing@OpenSSL.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED 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 OpenSSL PROJECT OR

 * ITS 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.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

#include "eng_int.h"

/* Initialise a engine type for use (or up its functional reference count

 * if it's already in use). This version is only used internally. */

EXPORT_C int engine_unlocked_init(ENGINE *e)

	{

	int to_return = 1;

	if((e->funct_ref == 0) && e->init)

		/* This is the first functional reference and the engine

		 * requires initialisation so we do it now. */

		to_return = e->init(e);

	if(to_return)

		{

		/* OK, we return a functional reference which is also a

		 * structural reference. */

		e->struct_ref++;

		e->funct_ref++;

		engine_ref_debug(e, 0, 1)

		engine_ref_debug(e, 1, 1)

		}

	return to_return;

	}

/* Free a functional reference to a engine type. This version is only used

 * internally. */

EXPORT_C int engine_unlocked_finish(ENGINE *e, int unlock_for_handlers)

	{

	int to_return = 1;

	/* Reduce the functional reference count here so if it's the terminating

	 * case, we can release the lock safely and call the finish() handler

	 * without risk of a race. We get a race if we leave the count until

	 * after and something else is calling "finish" at the same time -

	 * there's a chance that both threads will together take the count from

	 * 2 to 0 without either calling finish(). */

	e->funct_ref--;

	engine_ref_debug(e, 1, -1);

	if((e->funct_ref == 0) && e->finish)

		{

		if(unlock_for_handlers)

			CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);

		to_return = e->finish(e);

		if(unlock_for_handlers)

			CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);

		if(!to_return)

			return 0;

		}

#ifdef REF_CHECK

	if(e->funct_ref < 0)

		{

		fprintf(stderr,"ENGINE_finish, bad functional reference count\n");

		abort();

		}

#endif

	/* Release the structural reference too */

	if(!engine_free_util(e, 0))

		{

		ENGINEerr(ENGINE_F_ENGINE_UNLOCKED_FINISH,ENGINE_R_FINISH_FAILED);

		return 0;

		}

	return to_return;

	}

/* The API (locked) version of "init" */

EXPORT_C int ENGINE_init(ENGINE *e)

	{

	int ret;

	if(e == NULL)

		{

		ENGINEerr(ENGINE_F_ENGINE_INIT,ERR_R_PASSED_NULL_PARAMETER);

		return 0;

		}

	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);

	ret = engine_unlocked_init(e);

	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);

	return ret;

	}

/* The API (locked) version of "finish" */

EXPORT_C int ENGINE_finish(ENGINE *e)

	{

	int to_return = 1;

	if(e == NULL)

		{

		ENGINEerr(ENGINE_F_ENGINE_FINISH,ERR_R_PASSED_NULL_PARAMETER);

		return 0;

		}

	CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);

	to_return = engine_unlocked_finish(e, 1);

	CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);

	if(!to_return)

		{

		ENGINEerr(ENGINE_F_ENGINE_FINISH,ENGINE_R_FINISH_FAILED);

		return 0;

		}

	return to_return;

	}