Index: uspace/lib/c/include/io/chardev_srv.h
===================================================================
--- uspace/lib/c/include/io/chardev_srv.h	(revision c4c60250a236ed30397cd89ce5cea5eaf59cfba5)
+++ uspace/lib/c/include/io/chardev_srv.h	(revision 96258fcbd61a26b0de930d1c77a5891bfdd010a9)
@@ -61,4 +61,5 @@
 	int (*read)(chardev_srv_t *, void *, size_t, size_t *);
 	int (*write)(chardev_srv_t *, const void *, size_t, size_t *);
+	void (*def_handler)(chardev_srv_t *, ipc_callid_t, ipc_call_t *);
 };