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73b6924ed7
Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Richard Levitte <levitte@openssl.org>
76 lines
2.4 KiB
Plaintext
76 lines
2.4 KiB
Plaintext
=pod
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=head1 NAME
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OPENSSL_init_ssl - OpenSSL (libssl and libcrypto) initialisation
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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int OPENSSL_init_ssl(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings);
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=head1 DESCRIPTION
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During normal operation OpenSSL (libssl and libcrypto) will allocate various
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resources at start up that must, subsequently, be freed on close down of the
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library. Additionally some resources are allocated on a per thread basis (if the
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application is multi-threaded), and these resources must be freed prior to the
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thread closing.
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As of version 1.1.0 OpenSSL will automatically allocate all resources that it
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needs so no explicit initialisation is required. Similarly it will also
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automatically deinitialise as required.
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However, there may be situations when explicit initialisation is desirable or
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needed, for example when some non-default initialisation is required. The
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function OPENSSL_init_ssl() can be used for this purpose. Calling
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this function will explicitly initialise BOTH libcrypto and libssl. To
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explicitly initialise ONLY libcrypto see the
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L<OPENSSL_init_crypto(3)> function.
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Numerous internal OpenSSL functions call OPENSSL_init_ssl().
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Therefore, in order to perform non-default initialisation,
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OPENSSL_init_ssl() MUST be called by application code prior to
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any other OpenSSL function calls.
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The B<opts> parameter specifies which aspects of libssl and libcrypto should be
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initialised. Valid options for libcrypto are described on the
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L<OPENSSL_init_crypto(3)> page. In addition to any libcrypto
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specific option the following libssl options can also be used:
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=over 4
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=item OPENSSL_INIT_NO_LOAD_SSL_STRINGS
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Suppress automatic loading of the libssl error strings. This option is
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not a default option. Once selected subsequent calls to
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OPENSSL_init_ssl() with the option
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B<OPENSSL_INIT_LOAD_SSL_STRINGS> will be ignored.
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=item OPENSSL_INIT_LOAD_SSL_STRINGS
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Automatic loading of the libssl error strings. This option is a
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default option. Once selected subsequent calls to
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OPENSSL_init_ssl() with the option
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B<OPENSSL_INIT_LOAD_SSL_STRINGS> will be ignored.
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=back
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OPENSSL_init_ssl() takes a B<settings> parameter which can be used to
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set parameter values. See L<OPENSSL_init_crypto(3)> for details.
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=head1 RETURN VALUES
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The function OPENSSL_init_ssl() returns 1 on success or 0 on error.
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=head1 SEE ALSO
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L<OPENSSL_init_crypto(3)>
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=head1 HISTORY
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The OPENSSL_init_ssl() function was added in OpenSSL 1.1.0.
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=cut
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