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+/* 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. */
+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. */
+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" */
+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" */
+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;
+ }