+char *strdup_malloc(const char *s);
+
+int send_message_pid(pid_t pid, const char *msg, char **reply);
+
+int ustcomm_ustd_recv_message(struct ustcomm_ustd *ustd, char **msg, struct ustcomm_source *src, int timeout);
+int ustcomm_app_recv_message(struct ustcomm_app *app, char **msg, struct ustcomm_source *src, int timeout);