SSL_SESSION_FREE(3) OpenSSL SSL_SESSION_FREE(3)NAMESSL_SESSION_free - free an allocated SSL_SESSION structure
SYNOPSIS
#include <openssl/ssl.h>
void SSL_SESSION_free(SSL_SESSION *session);
DESCRIPTIONSSL_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 set-
tings, 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 com-
pletely 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 incre-
mented (e.g. by calling SSL_get1_session(), see
SSL_get_session(3)) or when the SSL_SESSION object was gen-
erated 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 VALUESSSL_SESSION_free() does not provide diagnostic information.
SEE ALSOssl(3), SSL_get_session(3),
SSL_CTX_set_session_cache_mode(3),
SSL_CTX_flush_sessions(3),
d2i_SSL_SESSION(3)MirOS BSD #10-current 2005-02-05 1
