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131 .IX Title "SSL_SESSION_free 3"
132 .TH SSL_SESSION_free 3 "2017-11-02" "1.0.2m" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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138 SSL_SESSION_free \- free an allocated SSL_SESSION structure
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/ssl.h>
144 \& void SSL_SESSION_free(SSL_SESSION *session);
147 .IX Header "DESCRIPTION"
148 \&\fISSL_SESSION_free()\fR decrements the reference count of \fBsession\fR and removes
149 the \fB\s-1SSL_SESSION\s0\fR structure pointed to by \fBsession\fR and frees up the allocated
150 memory, if the reference count has reached 0.
153 \&\s-1SSL_SESSION\s0 objects are allocated, when a \s-1TLS/SSL\s0 handshake operation
154 is successfully completed. Depending on the settings, see
155 \&\fISSL_CTX_set_session_cache_mode\fR\|(3),
156 the \s-1SSL_SESSION\s0 objects are internally referenced by the \s-1SSL_CTX\s0 and
157 linked into its session cache. \s-1SSL\s0 objects may be using the \s-1SSL_SESSION\s0 object;
158 as a session may be reused, several \s-1SSL\s0 objects may be using one \s-1SSL_SESSION\s0
159 object at the same time. It is therefore crucial to keep the reference
160 count (usage information) correct and not delete a \s-1SSL_SESSION\s0 object
161 that is still used, as this may lead to program failures due to
162 dangling pointers. These failures may also appear delayed, e.g.
163 when an \s-1SSL_SESSION\s0 object was completely freed as the reference count
164 incorrectly became 0, but it is still referenced in the internal
165 session cache and the cache list is processed during a
166 \&\fISSL_CTX_flush_sessions\fR\|(3) operation.
168 \&\fISSL_SESSION_free()\fR must only be called for \s-1SSL_SESSION\s0 objects, for
169 which the reference count was explicitly incremented (e.g.
170 by calling \fISSL_get1_session()\fR, see \fISSL_get_session\fR\|(3))
171 or when the \s-1SSL_SESSION\s0 object was generated outside a \s-1TLS\s0 handshake
172 operation, e.g. by using \fId2i_SSL_SESSION\fR\|(3).
173 It must not be called on other \s-1SSL_SESSION\s0 objects, as this would cause
174 incorrect reference counts and therefore program failures.
176 .IX Header "RETURN VALUES"
177 \&\fISSL_SESSION_free()\fR does not provide diagnostic information.
179 .IX Header "SEE ALSO"
180 \&\fIssl\fR\|(3), \fISSL_get_session\fR\|(3),
181 \&\fISSL_CTX_set_session_cache_mode\fR\|(3),
182 \&\fISSL_CTX_flush_sessions\fR\|(3),
183 \fId2i_SSL_SESSION\fR\|(3)