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OPENSSL_INIT_SSL(3)		    OpenSSL		   OPENSSL_INIT_SSL(3)

NAME
       OPENSSL_init_ssl	- OpenSSL (libssl and libcrypto) initialisation

SYNOPSIS
	#include <openssl/ssl.h>

	int OPENSSL_init_ssl(uint64_t opts, const OPENSSL_INIT_SETTINGS	*settings);

DESCRIPTION
       During normal operation OpenSSL (libssl and libcrypto) will allocate
       various resources at start up that must,	subsequently, be freed on
       close down of the library. Additionally some resources are allocated on
       a per thread basis (if the application is multi-threaded), and these
       resources must be freed prior to	the thread closing.

       As of version 1.1.0 OpenSSL will	automatically allocate all resources
       that it needs so	no explicit initialisation is required.	Similarly it
       will also automatically deinitialise as required.

       However,	there may be situations	when explicit initialisation is
       desirable or needed, for	example	when some non-default initialisation
       is required. The	function OPENSSL_init_ssl() can	be used	for this
       purpose.	Calling	this function will explicitly initialise BOTH
       libcrypto and libssl. To	explicitly initialise ONLY libcrypto see the
       OPENSSL_init_crypto(3) function.

       Numerous	internal OpenSSL functions call	OPENSSL_init_ssl().
       Therefore, in order to perform non-default initialisation,
       OPENSSL_init_ssl() MUST be called by application	code prior to any
       other OpenSSL function calls.

       The opts	parameter specifies which aspects of libssl and	libcrypto
       should be initialised. Valid options for	libcrypto are described	on the
       OPENSSL_init_crypto(3) page. In addition	to any libcrypto specific
       option the following libssl options can also be used:

       OPENSSL_INIT_NO_LOAD_SSL_STRINGS
	   Suppress automatic loading of the libssl error strings. This	option
	   is not a default option. Once selected subsequent calls to
	   OPENSSL_init_ssl() with the option OPENSSL_INIT_LOAD_SSL_STRINGS
	   will	be ignored.

       OPENSSL_INIT_LOAD_SSL_STRINGS
	   Automatic loading of	the libssl error strings. This option is a
	   default option. Once	selected subsequent calls to
	   OPENSSL_init_ssl() with the option OPENSSL_INIT_LOAD_SSL_STRINGS
	   will	be ignored.

       OPENSSL_init_ssl() takes	a settings parameter which can be used to set
       parameter values.  See OPENSSL_init_crypto(3) for details.

RETURN VALUES
       The function OPENSSL_init_ssl() returns 1 on success or 0 on error.

SEE ALSO
       OPENSSL_init_crypto(3)

HISTORY
       The OPENSSL_init_ssl() function was added in OpenSSL 1.1.0.

COPYRIGHT
       Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.

       Licensed	under the OpenSSL license (the "License").  You	may not	use
       this file except	in compliance with the License.	 You can obtain	a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.

1.1.1d				  2019-09-10		   OPENSSL_INIT_SSL(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | HISTORY | COPYRIGHT

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