Index: uspace/lib/c/include/errno.h
===================================================================
--- uspace/lib/c/include/errno.h	(revision dde2c909ae78adc75e2a57f90c8bc2db69a43bc9)
+++ uspace/lib/c/include/errno.h	(revision b1c6e58ba745c196849b41e8a430aabd7f1bbddf)
@@ -62,4 +62,7 @@
 #define ESTALL (-301)
 
+/** Empty resource (no data). */
+#define EEMPTY (-302)
+
 /** An API function is called while another blocking function is in progress. */
 #define EINPROGRESS  (-10036)