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