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SSL_SESSION_free.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" SSL_SESSION_new, SSL_SESSION_dup, SSL_SESSION_up_ref, SSL_SESSION_free \- create, free and manage SSL_SESSION structures .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/ssl.h> \& \& SSL_SESSION *SSL_SESSION_new(void); \& SSL_SESSION *SSL_SESSION_dup(SSL_SESSION *src); \& int SSL_SESSION_up_ref(SSL_SESSION *ses); \& void SSL_SESSION_free(SSL_SESSION *session); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSSL_SESSION_new()\fR creates a new \s-1SSL_SESSION\s0 structure and returns a pointer to it. .PP \&\fBSSL_SESSION_dup()\fR copies the contents of the \s-1SSL_SESSION\s0 structure in \fBsrc\fR and returns a pointer to it. .PP \&\fBSSL_SESSION_up_ref()\fR increments the reference count on the given \s-1SSL_SESSION\s0 structure. .PP \&\fBSSL_SESSION_free()\fR decrements the reference count of \fBsession\fR and removes the \fB\s-1SSL_SESSION\s0\fR structure pointed to by \fBsession\fR and frees up the allocated memory, if the reference count has reached 0. If \fBsession\fR is \s-1NULL\s0 nothing is done. .SH "NOTES" .IX Header "NOTES" \&\s-1SSL_SESSION\s0 objects are allocated, when a \s-1TLS/SSL\s0 handshake operation is successfully completed. Depending on the settings, see \&\fBSSL_CTX_set_session_cache_mode\fR\|(3), the \s-1SSL_SESSION\s0 objects are internally referenced by the \s-1SSL_CTX\s0 and linked into its session cache. \s-1SSL\s0 objects may be using the \s-1SSL_SESSION\s0 object; as a session may be reused, several \s-1SSL\s0 objects may be using one \s-1SSL_SESSION\s0 object at the same time. It is therefore crucial to keep the reference count (usage information) correct and not delete a \s-1SSL_SESSION\s0 object that is still used, as this may lead to program failures due to dangling pointers. These failures may also appear delayed, e.g. when an \s-1SSL_SESSION\s0 object was completely freed as the reference count incorrectly became 0, but it is still referenced in the internal session cache and the cache list is processed during a \&\fBSSL_CTX_flush_sessions\fR\|(3) operation. .PP \&\fBSSL_SESSION_free()\fR must only be called for \s-1SSL_SESSION\s0 objects, for which the reference count was explicitly incremented (e.g. by calling \fBSSL_get1_session()\fR, see \fBSSL_get_session\fR\|(3)) or when the \s-1SSL_SESSION\s0 object was generated outside a \s-1TLS\s0 handshake operation, e.g. by using \fBd2i_SSL_SESSION\fR\|(3). It must not be called on other \s-1SSL_SESSION\s0 objects, as this would cause incorrect reference counts and therefore program failures. .SH "RETURN VALUES" .IX Header "RETURN VALUES" SSL_SESSION_new returns a pointer to the newly allocated \s-1SSL_SESSION\s0 structure or \s-1NULL\s0 on error. .PP SSL_SESSION_up_ref returns 1 on success or 0 on error. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBssl\fR\|(7), \fBSSL_get_session\fR\|(3), \&\fBSSL_CTX_set_session_cache_mode\fR\|(3), \&\fBSSL_CTX_flush_sessions\fR\|(3), \&\fBd2i_SSL_SESSION\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" The \fBSSL_SESSION_dup()\fR function was added in OpenSSL 1.1.1. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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