+ * @param cls the closure from GNUNET_HELPER_start()
+ */
+typedef void (*GNUNET_HELPER_ExceptionCallback) (void *cls);
+
+
+/**
+ * Starts a helper and begins reading from it. The helper process is
+ * restarted when it dies except when it is stopped using GNUNET_HELPER_stop()
+ * or when the exp_cb callback is not NULL.
+ *
+ * @param with_control_pipe does the helper support the use of a control pipe for signalling?