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annotate test/serviceability/attach/AttachWithStalePidFile.java @ 18408:2c3666f44855

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Truffle: initial commit of object API implementation
author Andreas Woess <andreas.woess@jku.at>
date Tue, 18 Nov 2014 23:19:43 +0100
parents 09f19d3de485
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /*
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25 * @test
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26 * @bug 7162400
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27 * @key regression
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28 * @summary Regression test for attach issue where stale pid files in /tmp lead to connection issues
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29 * @library /testlibrary
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30 * @build com.oracle.java.testlibrary.* AttachWithStalePidFileTarget
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31 * @run main AttachWithStalePidFile
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32 */
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33
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34 import com.oracle.java.testlibrary.*;
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35 import com.sun.tools.attach.VirtualMachine;
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36 import sun.tools.attach.HotSpotVirtualMachine;
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37 import java.lang.reflect.Field;
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38 import java.nio.file.*;
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39 import java.nio.file.attribute.*;
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40 import java.io.*;
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41
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42 public class AttachWithStalePidFile {
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43 public static void main(String... args) throws Exception {
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44
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45 // this test is only valid on non-Windows platforms
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46 if(Platform.isWindows()) {
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47 System.out.println("This test is only valid on non-Windows platforms.");
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48 return;
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49 }
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50
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51 // Since there might be stale pid-files owned by different
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52 // users on the system we may need to retry the test in case we
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53 // are unable to remove the existing file.
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54 int retries = 5;
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55 while(!runTest() && --retries > 0);
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56
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57 if(retries == 0) {
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58 throw new RuntimeException("Test failed after 5 retries. " +
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59 "Remove any /tmp/.java_pid* files and retry.");
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60 }
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61 }
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62
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63 public static boolean runTest() throws Exception {
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64 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
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65 "-XX:+UnlockDiagnosticVMOptions", "-XX:+PauseAtStartup", "AttachWithStalePidFileTarget");
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66 Process target = pb.start();
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67 Path pidFile = null;
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68
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69 try {
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70 int pid = getUnixProcessId(target);
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71
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72 // create the stale .java_pid file. use hard-coded /tmp path as in th VM
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73 pidFile = createJavaPidFile(pid);
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74 if(pidFile == null) {
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75 return false;
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76 }
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77
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78 // wait for vm.paused file to be created and delete it once we find it.
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79 waitForAndResumeVM(pid);
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80
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81 // unfortunately there's no reliable way to know the VM is ready to receive the
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82 // attach request so we have to do an arbitrary sleep.
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83 Thread.sleep(5000);
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84
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85 HotSpotVirtualMachine vm = (HotSpotVirtualMachine)VirtualMachine.attach(((Integer)pid).toString());
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86 BufferedReader remoteDataReader = new BufferedReader(new InputStreamReader(vm.remoteDataDump()));
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87 String line = null;
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88 while((line = remoteDataReader.readLine()) != null);
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89
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90 vm.detach();
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91 return true;
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92 }
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93 finally {
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94 target.destroy();
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95 target.waitFor();
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96
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97 if(pidFile != null && Files.exists(pidFile)) {
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98 Files.delete(pidFile);
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99 }
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100 }
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101 }
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102
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103 private static Path createJavaPidFile(int pid) throws Exception {
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104 Path pidFile = Paths.get("/tmp/.java_pid" + pid);
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105 if(Files.exists(pidFile)) {
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106 try {
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107 Files.delete(pidFile);
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108 }
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109 catch(FileSystemException e) {
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110 if(e.getReason().equals("Operation not permitted")) {
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111 System.out.println("Unable to remove exisiting stale PID file" + pidFile);
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112 return null;
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113 }
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114 throw e;
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115 }
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116 }
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117 return Files.createFile(pidFile,
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118 PosixFilePermissions.asFileAttribute(PosixFilePermissions.fromString("rw-------")));
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119 }
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120
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121 private static void waitForAndResumeVM(int pid) throws Exception {
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122 Path pauseFile = Paths.get("vm.paused." + pid);
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123 int retries = 60;
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124 while(!Files.exists(pauseFile) && --retries > 0) {
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125 Thread.sleep(1000);
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126 }
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127 if(retries == 0) {
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128 throw new RuntimeException("Timeout waiting for VM to start. " +
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129 "vm.paused file not created within 60 seconds.");
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130 }
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131 Files.delete(pauseFile);
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132 }
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133
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134 private static int getUnixProcessId(Process unixProcess) throws Exception {
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135 Field pidField = unixProcess.getClass().getDeclaredField("pid");
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136 pidField.setAccessible(true);
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137 return (Integer)pidField.get(unixProcess);
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138 }
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139 }