int send_message(pid_t pid, const char *msg, char **reply);
+int ustcomm_ustd_recv_message(struct ustcomm_ustd *ustd, char **msg);
+int ustcomm_app_recv_message(struct ustcomm_app *app, char **msg);
+
int ustcomm_init_app(pid_t pid, struct ustcomm_app *handle);
int ustcomm_init_ustd(struct ustcomm_ustd *handle);