+ * Unconfigured device function; driver not configured.
+ */
+enxio()
+{
+
+ return (ENXIO);
+}
+
+/*
+ * Unsupported ioctl function.
+ */
+enoioctl()
+{
+
+ return (ENOTTY);
+}
+
+/*
+ * Unsupported system function.
+ * This is used for an otherwise-reasonable operation
+ * that is not supported by the current system binary.
+ */
+enosys()
+{
+
+ return (ENOSYS);
+}
+
+/*
+ * Return error for operation not supported
+ * on a specific object or file type.