/*

 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 */

import com.sun.tools.attach.VirtualMachine;

import java.io.IOException;

/**

 * @test

 * @modules jdk.attach

 * @run main AttachSelf

 * @run main/othervm -Djdk.attach.allowAttachSelf AttachSelf

 * @run main/othervm -Djdk.attach.allowAttachSelf=true AttachSelf

 * @run main/othervm -Djdk.attach.allowAttachSelf=false AttachSelf

 */

public class AttachSelf {

    public static void main(String[] args) throws Exception {

        String value = System.getProperty("jdk.attach.allowAttachSelf");

        boolean canAttachSelf = (value != null) && !value.equals("false");

        String vmid = "" + ProcessHandle.current().pid();

        VirtualMachine vm = null;

        try {

            vm = VirtualMachine.attach(vmid);

            if (!canAttachSelf)

                throw new RuntimeException("Attached to self not expected");

        } catch (IOException ioe) {

            if (canAttachSelf)

                throw ioe;

        } finally {

            if (vm != null) vm.detach();

        }

    }

}