/*
 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 */

package java.lang;

import jdk.internal.misc.Signal;


/**
 * Package-private utility class for setting up and tearing down
 * platform-specific support for termination-triggered shutdowns.
 *
 * @author Mark Reinhold
 * @since 1.3
 */

class Terminator {

 private static Signal.Handler handler = null;

 /* Invocations of setup and teardown are already synchronized
 * on the shutdown lock, so no further synchronization is needed here
 */

 static void setup() {
 if (handler != null) return;
 Signal.Handler sh = new Signal.Handler() {
 public void handle(Signal sig) {
 Shutdown.exit(sig.getNumber() + 0200);
 }
 };
 handler = sh;

 // When -Xrs is specified the user is responsible for
 // ensuring that shutdown hooks are run by calling
 // System.exit()
 try {
 Signal.handle(new Signal("INT"), sh);
 } catch (IllegalArgumentException e) {
 }
 try {
 Signal.handle(new Signal("TERM"), sh);
 } catch (IllegalArgumentException e) {
 }
 }

 static void teardown() {
 /* The current sun.misc.Signal class does not support
 * the cancellation of handlers
 */
 }

}