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annotate test/serviceability/attach/AttachWithStalePidFile.java @ 20218:828056cf311f

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8040792: G1: Memory usage calculation uses sizeof(this) instead of sizeof(classname) Summary: A few locations in the code use sizeof(this) which returns the size of the pointer instead of sizeof(classname) which returns the size of the sum of its members. This change fixes these errors and adds a few tests. Reviewed-by: mgerdin, brutisso
author tschatzl
date Mon, 21 Jul 2014 09:40:19 +0200
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 }
2e8f19c2feef 7162400: Intermittent java.io.IOException: Bad file number during HotSpotVirtualMachine.executeCommand
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133
2e8f19c2feef 7162400: Intermittent java.io.IOException: Bad file number during HotSpotVirtualMachine.executeCommand
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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 }