+ if (e) {
+ _cleanup_free_ char *ee = NULL;
+
+ ee = bus_address_escape(e);
+ if (!ee) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+#ifdef ENABLE_KDBUS
+ asprintf(&b->address, "kernel:path=/dev/kdbus/%lu-user/bus;unix:path=%s/bus", (unsigned long) getuid(), ee);
+#else
+ b->address = strjoin("unix:path=", ee, "/bus", NULL);
+#endif
+ } else {
+#ifdef ENABLE_KDBUS
+ asprintf(&b->address, "kernel:path=/dev/kdbus/%lu-user/bus", (unsigned long) getuid());
+#else
+ return -ECONNREFUSED;
+#endif