diff -r 990734f548ef -r 655020a30e77 ucx/ucx.h
--- a/ucx/ucx.h	Sun Nov 04 20:50:12 2012 +0100
+++ b/ucx/ucx.h	Fri Nov 30 13:10:58 2012 +0100
@@ -37,6 +37,12 @@
 /* element,custom data -> copy of element */
 typedef void*(*copy_func)(void*,void*);
 
+/* buffer, element size, element count, stream */
+typedef size_t(*write_func)(const void*, size_t, size_t, void*);
+
+/* buffer, element size, element count, stream */
+typedef size_t(*read_func)(void*, size_t, size_t, void*);
+
 #ifdef	__cplusplus
 }
 #endif