is a gnutls_session_t type.
void * session_id
is a pointer to space to hold the session id.
size_t * session_id_size
initially should contain the maximum session_id size and
will be updated.
Returns the current session ID. This can be used if you want to check
if the next session you tried to resume was actually resumed. That
is because resumed sessions share the same session ID with the
The session ID is selected by the server, that identify the current
session. In all supported TLS protocols, the session id is less than
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gnutls 3.5.9 gnutls_session_get_id(3)