01: /*
02: * Copyright 1999-2001 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any questions.
24: */
25:
26: package java.lang;
27:
28: import sun.misc.Signal;
29: import sun.misc.SignalHandler;
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: * @version 1.16, 07/05/05
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)
50: return;
51: SignalHandler sh = new SignalHandler() {
52: public void handle(Signal sig) {
53: Shutdown.exit(sig.getNumber() + 0200);
54: }
55: };
56: handler = sh;
57: try {
58: Signal.handle(new Signal("INT"), sh);
59: Signal.handle(new Signal("TERM"), sh);
60: } catch (IllegalArgumentException e) {
61: // When -Xrs is specified the user is responsible for
62: // ensuring that shutdown hooks are run by calling
63: // System.exit()
64: }
65: }
66:
67: static void teardown() {
68: /* The current sun.misc.Signal class does not support
69: * the cancellation of handlers
70: */
71: }
72:
73: }
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