201 lines
6.8 KiB
Groff
Executable File
201 lines
6.8 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "OPENSSL_INIT_SSL 3"
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.TH OPENSSL_INIT_SSL 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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OPENSSL_init_ssl \- OpenSSL (libssl and libcrypto) initialisation
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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\&
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\& int OPENSSL_init_ssl(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "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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.PP
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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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.PP
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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 \fIOPENSSL_init_ssl()\fR can be used for this purpose. Calling
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this function will explicitly initialise \s-1BOTH\s0 libcrypto and libssl. To
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explicitly initialise \s-1ONLY\s0 libcrypto see the
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\&\fIOPENSSL_init_crypto\fR\|(3) function.
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.PP
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Numerous internal OpenSSL functions call \fIOPENSSL_init_ssl()\fR.
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Therefore, in order to perform non-default initialisation,
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\&\fIOPENSSL_init_ssl()\fR \s-1MUST\s0 be called by application code prior to
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any other OpenSSL function calls.
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.PP
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The \fBopts\fR 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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\&\fIOPENSSL_init_crypto\fR\|(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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.IP "\s-1OPENSSL_INIT_NO_LOAD_SSL_STRINGS\s0" 4
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.IX 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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\&\fIOPENSSL_init_ssl()\fR with the option
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\&\fB\s-1OPENSSL_INIT_LOAD_SSL_STRINGS\s0\fR will be ignored.
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.IP "\s-1OPENSSL_INIT_LOAD_SSL_STRINGS\s0" 4
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.IX 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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\&\fIOPENSSL_init_ssl()\fR with the option
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\&\fB\s-1OPENSSL_INIT_LOAD_SSL_STRINGS\s0\fR will be ignored.
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.PP
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\&\fIOPENSSL_init_ssl()\fR takes a \fBsettings\fR parameter which can be used to
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set parameter values. See \fIOPENSSL_init_crypto\fR\|(3) for details.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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The function \fIOPENSSL_init_ssl()\fR returns 1 on success or 0 on error.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIOPENSSL_init_crypto\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The \fIOPENSSL_init_ssl()\fR function was added in OpenSSL 1.1.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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