extern int ustcomm_connect_app(pid_t pid, struct ustcomm_connection *conn);
extern int ustcomm_connect_path(const char *path, struct ustcomm_connection *conn, pid_t signalpid);
extern int ustcomm_connect_app(pid_t pid, struct ustcomm_connection *conn);
extern int ustcomm_connect_path(const char *path, struct ustcomm_connection *conn, pid_t signalpid);