-void hc_conn_set_driver_channel (HCConn *, int);
-void hc_conn_set_driver_ssl_client (HCConn *, HCConn *);
+int hc_conn_set_driver_channel (HCConn *, int);
+int hc_conn_set_driver_ssl_client (HCConn *, HCConn *);
+int hc_conn_set_driver_ssl_server (HCConn *, HCConn *);