Index: uspace/lib/c/include/async.h
===================================================================
--- uspace/lib/c/include/async.h	(revision 455f190e4b0862368809250e0ad9bfb7504cfe9a)
+++ uspace/lib/c/include/async.h	(revision 866e627983a4c2729536d3da7c79932dc4dc9f27)
@@ -479,4 +479,10 @@
 extern async_sess_t *async_callback_receive_start(exch_mgmt_t, ipc_call_t *);
 
+extern int async_state_change_start(async_exch_t *, sysarg_t, sysarg_t,
+    sysarg_t, async_exch_t *);
+extern bool async_state_change_receive(ipc_callid_t *, sysarg_t *, sysarg_t *,
+    sysarg_t *);
+extern int async_state_change_finalize(ipc_callid_t, async_exch_t *);
+
 #endif