Updated exception

Exception.h

@@ -3,13 +3,14 @@
 
 #include <string.h>
 #include <string>
+#include <errno.h>
 
 namespace coreutils {
 
    class Exception {
 
     public:
-      Exception(std::string text, std::string file = __FILE__, int line = __LINE__, int errorNumber = -1);
+      Exception(std::string text, std::string file = __FILE__, int line = __LINE__, int errorNumber = errno);
 
       std::string className;
       std::string file;