-int ustcomm_connect_app(pid_t pid, struct ustcomm_connection *conn);
-int ustcomm_send_request(struct ustcomm_connection *conn, char *req, char **reply);
-int ustcomm_send_reply(struct ustcomm_server *server, char *msg, struct ustcomm_source *src);
+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_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_close_all_connections(struct ustcomm_server *server);