Index: uspace/lib/libc/include/ipc/ipc.h
===================================================================
--- uspace/lib/libc/include/ipc/ipc.h	(revision 36d852c81b0cd5dc20eb486f72e3451ade4780a2)
+++ uspace/lib/libc/include/ipc/ipc.h	(revision ee1b8ca73ee74edd4f777249bab470594b67a438)
@@ -261,9 +261,13 @@
 extern int ipc_forward_fast(ipc_callid_t callid, int phoneid, int method,
     ipcarg_t arg1, ipcarg_t arg2, int mode);
+
+
+extern int ipc_data_read_send(int phoneid, void *dst, size_t size);
+extern int ipc_data_read_receive(ipc_callid_t *callid, size_t *size);
+extern int ipc_data_read_deliver(ipc_callid_t callid, void *src, size_t size);
 extern int ipc_data_write_send(int phoneid, void *src, size_t size);
 extern int ipc_data_write_receive(ipc_callid_t *callid, void **dst,
     size_t *size);
-extern ipcarg_t ipc_data_write_deliver(ipc_callid_t callid, void *dst,
-    size_t size);
+extern int ipc_data_write_deliver(ipc_callid_t callid, void *dst, size_t size);
 
 #endif