1 /* 2 * Copyright (c) 1999, 2001, 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 26 package java.lang; 27 28 import sun.misc.Signal; 29 import sun.misc.SignalHandler; 30 31 32 /** 33 * Package-private utility class for setting up and tearing down 34 * platform-specific support for termination-triggered shutdowns. 35 * 36 * @author Mark Reinhold 37 * @since 1.3 38 */ 39 40 class Terminator { 41 42 private static SignalHandler handler = null; 43 44 /* Invocations of setup and teardown are already synchronized 45 * on the shutdown lock, so no further synchronization is needed here 46 */ 47 48 static void setup() { 49 if (handler != null) return; 50 SignalHandler sh = new SignalHandler() { 51 public void handle(Signal sig) { 52 Shutdown.exit(sig.getNumber() + 0200); 53 } 54 }; 55 handler = sh; 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("HUP"), sh); 61 } catch (IllegalArgumentException e) { 62 } 63 try { 64 Signal.handle(new Signal("INT"), sh); 65 } catch (IllegalArgumentException e) { 66 } 67 try { 68 Signal.handle(new Signal("TERM"), sh); 69 } catch (IllegalArgumentException e) { 70 } 71 } 72 73 static void teardown() { 74 /* The current sun.misc.Signal class does not support 75 * the cancellation of handlers 76 */ 77 } 78 79 }