Index: uspace/lib/socket/include/net_err.h
===================================================================
--- uspace/lib/socket/include/net_err.h	(revision 2fa10f640409c06070df4329491173719b3e824c)
+++ uspace/lib/socket/include/net_err.h	(revision 553f430ae7554b5a008b156a9bf4f21e339982bc)
@@ -81,4 +81,6 @@
 #endif
 
+#define ERROR_NONE(value)	!ERROR_OCCURRED((value))
+
 /** Error propagation
  *