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SSL_SESSION_free(3) OpenSSL SSL_SESSION_free(3)
SSL_SESSION_free - free an allocated SSL_SESSION structure
void SSL_SESSION_free(SSL_SESSION *session);
SSL_SESSION_free() decrements the reference count of session and removes the SSL_SESSION
structure pointed to by session and frees up the allocated memory, if the the reference
count has reached 0.
SSL_SESSION objects are allocated, when a TLS/SSL handshake operation is successfully com-
pleted. Depending on the settings, see SSL_CTX_set_session_cache_mode(3), the SSL_SESSION
objects are internally referenced by the SSL_CTX and linked into its session cache. SSL
objects may be using the SSL_SESSION object; as a session may be reused, several SSL
objects may be using one SSL_SESSION object at the same time. It is therefore crucial to
keep the reference count (usage information) correct and not delete a SSL_SESSION 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 SSL_SESSION object was completely freed as
the reference count incorrectly became 0, but it is still referenced in the internal ses-
sion cache and the cache list is processed during a SSL_CTX_flush_sessions(3) operation.
SSL_SESSION_free() must only be called for SSL_SESSION objects, for which the reference
count was explicitly incremented (e.g. by calling SSL_get1_session(), see SSL_get_ses-
sion(3)) or when the SSL_SESSION object was generated outside a TLS handshake operation,
e.g. by using d2i_SSL_SESSION(3). It must not be called on other SSL_SESSION objects, as
this would cause incorrect reference counts and therefore program failures.
SSL_SESSION_free() does not provide diagnostic information.
ssl(3), SSL_get_session(3), SSL_CTX_set_session_cache_mode(3), SSL_CTX_flush_sessions(3),
0.9.7d 2002-12-01 SSL_SESSION_free(3)
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