SSL_free() decrements the reference count of ssl, and removes the SSL structure pointed to
by ssl and frees up the allocated
memory if the reference count has reached 0.
NOTES
SSL_free() also calls the free()ing procedures for indirectly
affected items, if applicable: the buffering BIO, the read and write
BIOs, cipher lists specially created for this ssl, the SSL_SESSION. Do not explicitly free these
indirectly freed up items before or after calling SSL_free(), as
trying to free things twice may lead to program failure.
The ssl session has reference counts from two users: the SSL object,
for which the reference count is removed by SSL_free() and the
internal session cache. If the session is considered bad, because
SSL_shutdown(3) was not
called for the connection and SSL_set_shutdown(3) was not
used to set the SSL_SENT_SHUTDOWN state, the session will also be
removed from the session cache as required by RFC2246.
RETURN VALUES
SSL_free() does not provide diagnostic information.