1 /* 2 * Copyright (c) 2007, 2018, 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 package vm.share; 24 25 import java.io.File; 26 import java.io.IOException; 27 import java.lang.management.ManagementFactory; 28 import java.lang.reflect.Field; 29 30 import nsk.share.TestBug; 31 32 import com.sun.management.HotSpotDiagnosticMXBean; 33 34 public final class ProcessUtils { 35 static { 36 System.loadLibrary("ProcessUtils"); 37 } 38 ProcessUtils()39 private ProcessUtils() {} 40 41 /** 42 * Send Ctrl-\ to java process and Ctrl-Break on Windows. 43 * This will usually trigger stack dump for all threads and 44 * may trigger heap dump. 45 * 46 * @return true if it was successful 47 */ sendCtrlBreak()48 public static native boolean sendCtrlBreak(); 49 50 /** 51 * Send any signal to java process on Unix. It currently does nothing on Windows. 52 * 53 * @return true if it was successful 54 */ sendSignal(int signalNum)55 public static native boolean sendSignal(int signalNum); 56 57 /** 58 * Force java process to dump core. 59 * 60 * This is done by sending SIGSEGV on unix systems. 61 * 62 * @return true if it was successful, false if not (for example on Windows) 63 */ dumpCore()64 public static native boolean dumpCore(); 65 66 /** 67 * Get PID of java process. 68 * 69 * @return PID 70 */ getPid()71 public static native int getPid(); 72 getPid(Process process)73 public static int getPid(Process process) { 74 Throwable exception; 75 try { 76 Field pidField = process.getClass().getDeclaredField("pid"); 77 pidField.setAccessible(true); 78 return ((Integer) pidField.get(process)).intValue(); 79 } catch (NoSuchFieldException e) { 80 exception = e; 81 } catch (IllegalAccessException e) { 82 exception = e; 83 } 84 // Try to get Windows handle 85 try { 86 Field handleField = process.getClass().getDeclaredField("handle"); 87 handleField.setAccessible(true); 88 long handle = ((Long) handleField.get(process)).longValue(); 89 return getWindowsPid(handle); 90 } catch (NoSuchFieldException e) { 91 exception = e; 92 } catch (IllegalAccessException e) { 93 exception = e; 94 } 95 throw new TestBug("Unable to determine pid from process class " + process.getClass(), exception); 96 } 97 getWindowsPid(long handle)98 private static native int getWindowsPid(long handle); 99 100 @SuppressWarnings("restriction") dumpHeapWithHotspotDiagnosticMXBean(String fileName)101 public static void dumpHeapWithHotspotDiagnosticMXBean(String fileName) throws IOException { 102 System.err.println("Dumping heap to " + fileName); 103 104 File f = new File(fileName); 105 if (f.exists()) 106 f.delete(); 107 108 HotSpotDiagnosticMXBean b = ManagementFactory.getPlatformMXBeans( 109 com.sun.management.HotSpotDiagnosticMXBean.class).get(0); 110 b.dumpHeap(fileName, false); 111 } 112 } 113