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SSL_SESSION_free(3)                                OpenSSL                               SSL_SESSION_free(3)



NAME
       SSL_SESSION_free - free an allocated SSL_SESSION structure

SYNOPSIS
        #include <openssl/ssl.h>

        void SSL_SESSION_free(SSL_SESSION *session);

DESCRIPTION
       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 reference count has reached 0.

NOTES
       SSL_SESSION objects are allocated, when a TLS/SSL handshake operation is successfully completed.
       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 session 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_session(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.

RETURN VALUES
       SSL_SESSION_free() does not provide diagnostic information.

SEE ALSO
       ssl(3), SSL_get_session(3), SSL_CTX_set_session_cache_mode(3), SSL_CTX_flush_sessions(3),
        d2i_SSL_SESSION(3)



0.9.8                                            2009-04-03                              SSL_SESSION_free(3)