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