1/* 2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package java.lang; 27 28import jdk.internal.misc.Signal; 29 30 31/** 32 * Package-private utility class for setting up and tearing down 33 * platform-specific support for termination-triggered shutdowns. 34 * 35 * @author Mark Reinhold 36 * @since 1.3 37 */ 38 39class Terminator { 40 41 private static Signal.Handler handler = null; 42 43 /* Invocations of setup and teardown are already synchronized 44 * on the shutdown lock, so no further synchronization is needed here 45 */ 46 47 static void setup() { 48 if (handler != null) return; 49 Signal.Handler sh = new Signal.Handler() { 50 public void handle(Signal sig) { 51 Shutdown.exit(sig.getNumber() + 0200); 52 } 53 }; 54 handler = sh; 55 56 // When -Xrs is specified the user is responsible for 57 // ensuring that shutdown hooks are run by calling 58 // System.exit() 59 try { 60 Signal.handle(new Signal("INT"), sh); 61 } catch (IllegalArgumentException e) { 62 } 63 try { 64 Signal.handle(new Signal("TERM"), sh); 65 } catch (IllegalArgumentException e) { 66 } 67 } 68 69 static void teardown() { 70 /* The current sun.misc.Signal class does not support 71 * the cancellation of handlers 72 */ 73 } 74 75} 76