missing file for lesson 21

cfenollosa · cfenollosa · commit 1ffc847737ae · 2015-04-01T09:45:59.000+02:00
diff --git a/21-shell/libc/function.h b/21-shell/libc/function.h
@@ -0,0 +1,8 @@
+#ifndef FUNCTION_H
+#define FUNCTION_H
+
+/* Sometimes we want to keep parameters to a function for later use
+ * and this is a solution to avoid the 'unused parameter' compiler warning */
+#define UNUSED(x) (void)(x)
+
+#endif
