extern int ustcomm_send_request(struct ustcomm_connection *conn, const char *req, char **reply);
extern int ustcomm_send_reply(struct ustcomm_server *server, char *msg, struct ustcomm_source *src);
extern int ustcomm_disconnect(struct ustcomm_connection *conn);
extern int ustcomm_send_request(struct ustcomm_connection *conn, const char *req, char **reply);
extern int ustcomm_send_reply(struct ustcomm_server *server, char *msg, struct ustcomm_source *src);
extern int ustcomm_disconnect(struct ustcomm_connection *conn);