--- /dev/null	2016-02-02 08:28:09.597457739 +0100
+++ new/src/java.base/share/classes/jdk/internal/misc/NativeSignal.java	2016-02-02 22:57:29.077518467 +0100
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 1998, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package jdk.internal.misc;
+
+/**
+ * Internal interface implemented by private extension of {@link java.util.Signal}.
+ */
+public interface NativeSignal {
+
+    /**
+     * Register a native handler of the Signal.
+     * Given handler replaces current signal handler.
+     *
+     * @param nativeHandler a native signal handler
+     * @throws UnsupportedOperationException if handling of the signal is
+     *                                       not supported by the implementation
+     */
+    void register(long nativeHandler);
+
+    /**
+     * Unregister a native handler of the Signal.
+     * If given nativeHandler is the most recently registered handler for the signal,
+     * signal handling is restored to the state prior to registering given nativeHandler
+     * and the method returns {@code true}; otherwise the currently registered
+     * handler is left unchanged and {@code false} is returned.
+     *
+     * @param nativeHandler a native signal handler
+     * @return {@code true} if given nativeHandler was the most recently registered handler
+     *         and was unregistered, otherwise {@code false}
+     */
+    boolean unregister(long nativeHandler);
+}