src/share/classes/sun/misc/VM.java

@@ -365,10 +365,15 @@
      * Returns the first non-null class loader up the execution stack,
      * or null if only code from the null class loader is on the stack.
      */
     public static native ClassLoader latestUserDefinedLoader();
 
+    /**
+     * Returns {@code true} if we are in a set UID program.
+     */
+    public static native boolean isSetUID();
+
     static {
         initialize();
     }
     private native static void initialize();
 }