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Title "SSL_SESSION_free 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
SSL_SESSION_free - free an allocated SSL_SESSION structure Header "SYNOPSIS" .Vb 1 #include <openssl/ssl.h> \& void SSL_SESSION_free(SSL_SESSION *session); .Ve Header "DESCRIPTION" \fISSL_SESSION_free() decrements the reference count of session and removes the \s-1SSL_SESSION\s0 structure pointed to by session and frees up the allocated memory, if the reference count has reached 0. 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 \fISSL_CTX_set_session_cache_mode\|(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 \fISSL_CTX_flush_sessions\|(3) operation.

\fISSL_SESSION_free() must only be called for \s-1SSL_SESSION\s0 objects, for which the reference count was explicitly incremented (e.g. by calling SSL_get1_session(), see SSL_get_session\|(3)) or when the \s-1SSL_SESSION\s0 object was generated outside a \s-1TLS\s0 handshake operation, e.g. by using d2i_SSL_SESSION\|(3). It must not be called on other \s-1SSL_SESSION\s0 objects, as this would cause incorrect reference counts and therefore program failures.

Header "RETURN VALUES" \fISSL_SESSION_free() does not provide diagnostic information. Header "SEE ALSO" \fIssl\|(3), SSL_get_session\|(3), \fISSL_CTX_set_session_cache_mode\|(3), \fISSL_CTX_flush_sessions\|(3), d2i_SSL_SESSION\|(3)