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137 .IX Title "SSL_SESSION_free 3"
138 .TH SSL_SESSION_free 3 "2009-07-19" "1.0.1n" "OpenSSL"
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144 SSL_SESSION_free \- free an allocated SSL_SESSION structure
148 .IX Header "SYNOPSIS"
150 \& #include <openssl/ssl.h>
152 \& void SSL_SESSION_free(SSL_SESSION *session);
155 .IX Header "DESCRIPTION"
156 \&\fISSL_SESSION_free()\fR decrements the reference count of \fBsession\fR and removes
157 the \fB\s-1SSL_SESSION\s0\fR structure pointed to by \fBsession\fR and frees up the allocated
158 memory, if the reference count has reached 0.
161 \&\s-1SSL_SESSION\s0 objects are allocated, when a \s-1TLS/SSL\s0 handshake operation
162 is successfully completed. Depending on the settings, see
163 \&\fISSL_CTX_set_session_cache_mode\fR\|(3),
164 the \s-1SSL_SESSION\s0 objects are internally referenced by the \s-1SSL_CTX\s0 and
165 linked into its session cache. \s-1SSL\s0 objects may be using the \s-1SSL_SESSION\s0 object;
166 as a session may be reused, several \s-1SSL\s0 objects may be using one \s-1SSL_SESSION\s0
167 object at the same time. It is therefore crucial to keep the reference
168 count (usage information) correct and not delete a \s-1SSL_SESSION\s0 object
169 that is still used, as this may lead to program failures due to
170 dangling pointers. These failures may also appear delayed, e.g.
171 when an \s-1SSL_SESSION\s0 object was completely freed as the reference count
172 incorrectly became 0, but it is still referenced in the internal
173 session cache and the cache list is processed during a
174 \&\fISSL_CTX_flush_sessions\fR\|(3) operation.
176 \&\fISSL_SESSION_free()\fR must only be called for \s-1SSL_SESSION\s0 objects, for
177 which the reference count was explicitly incremented (e.g.
178 by calling \fISSL_get1_session()\fR, see \fISSL_get_session\fR\|(3))
179 or when the \s-1SSL_SESSION\s0 object was generated outside a \s-1TLS\s0 handshake
180 operation, e.g. by using \fId2i_SSL_SESSION\fR\|(3).
181 It must not be called on other \s-1SSL_SESSION\s0 objects, as this would cause
182 incorrect reference counts and therefore program failures.
184 .IX Header "RETURN VALUES"
185 \&\fISSL_SESSION_free()\fR does not provide diagnostic information.
187 .IX Header "SEE ALSO"
188 \&\fIssl\fR\|(3), \fISSL_get_session\fR\|(3),
189 \&\fISSL_CTX_set_session_cache_mode\fR\|(3),
190 \&\fISSL_CTX_flush_sessions\fR\|(3),
191 \fId2i_SSL_SESSION\fR\|(3)