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.\" ========================================================================
.\"
.IX Title "SSL_SESSION_FREE 3SSL"
.TH SSL_SESSION_FREE 3SSL "2023-10-23" "3.0.11" "OpenSSL"
.\" For nroff, turn off justification. 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(const 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 creates a new \s-1SSL_SESSION\s0 structure that is a copy of \fBsrc\fR.
The copy is not owned by any cache that \fBsrc\fR may have been in.
.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_dup returns a pointer to the new copy 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\-2023 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (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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