1/*
2 * Copyright (c) 2017, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24import com.sun.tools.attach.VirtualMachine;
25
26import java.io.IOException;
27
28/**
29 * @test
30 * @modules jdk.attach
31 * @run main AttachSelf
32 * @run main/othervm -Djdk.attach.allowAttachSelf AttachSelf
33 * @run main/othervm -Djdk.attach.allowAttachSelf=true AttachSelf
34 * @run main/othervm -Djdk.attach.allowAttachSelf=false AttachSelf
35 */
36
37public class AttachSelf {
38
39    public static void main(String[] args) throws Exception {
40
41        String value = System.getProperty("jdk.attach.allowAttachSelf");
42        boolean canAttachSelf = (value != null) && !value.equals("false");
43
44        String vmid = "" + ProcessHandle.current().pid();
45
46        VirtualMachine vm = null;
47        try {
48            vm = VirtualMachine.attach(vmid);
49            if (!canAttachSelf)
50                throw new RuntimeException("Attached to self not expected");
51        } catch (IOException ioe) {
52            if (canAttachSelf)
53                throw ioe;
54        } finally {
55            if (vm != null) vm.detach();
56        }
57
58    }
59
60}
61
62