+/* --mute: If true, accept connections from switches but do not reply to any
+ * of their messages (for debugging fail-open mode). */
+static bool mute = false;
+
+/* -q, --queue: OpenFlow queue to use, or the default queue if UINT32_MAX. */
+static uint32_t queue_id = UINT32_MAX;
+
+/* --unixctl: Name of unixctl socket, or null to use the default. */
+static char *unixctl_path = NULL;
+