SSL_set_shutdown, SSL_get_shutdown - manipulate shutdown state of an SSL connection
void SSL_set_shutdown(SSL *ssl, int mode);
int SSL_get_shutdown(const SSL *ssl);
The shutdown state of an ssl connection is a bitmask of:
SSL_SENT_SHUTDOWN and SSL_RECEIVED_SHUTDOWN can be set at the same time.
The shutdown state of the connection is used to determine the state of the
ssl session. If the session is still open, when
SSL_clear(3) or SSL_free(3) is called, it is considered bad and removed according to RFC2246. The
actual condition for a correctly closed session is SSL_SENT_SHUTDOWN
(according to the TLS RFC, it is acceptable to only send the ``close
notify'' alert but to not wait for the peer's answer, when the underlying
connection is closed).
If a ``close notify'' was received, SSL_RECEIVED_SHUTDOWN will be set, for
setting SSL_SENT_SHUTDOWN the application must however still call