Add some SYS_E[...] error codes.
@@ -35,6 +35,9 @@ extern "C" {
#define SYS_EBUSY (-8)
#define SYS_ENODEV (-9)
#define SYS_ERANGE (-10)
+#define SYS_EALREADY (-11)
+#define SYS_ENOTSUP (-12)
+#define SYS_EUNKNOWN (-13)
#define SYS_EPERUSER (-65535)
