| /* |
| * Copyright (c) 2013, 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 |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 7162400 |
| * @key regression |
| * @summary Regression test for attach issue where stale pid files in /tmp lead to connection issues |
| * @library /testlibrary |
| * @build com.oracle.java.testlibrary.* AttachWithStalePidFileTarget |
| * @run main AttachWithStalePidFile |
| */ |
| |
| import com.oracle.java.testlibrary.*; |
| import com.sun.tools.attach.VirtualMachine; |
| import sun.tools.attach.HotSpotVirtualMachine; |
| import java.lang.reflect.Field; |
| import java.nio.file.*; |
| import java.nio.file.attribute.*; |
| import java.io.*; |
| |
| public class AttachWithStalePidFile { |
| public static void main(String... args) throws Exception { |
| |
| // this test is only valid on non-Windows platforms |
| if(Platform.isWindows()) { |
| System.out.println("This test is only valid on non-Windows platforms."); |
| return; |
| } |
| |
| // Since there might be stale pid-files owned by different |
| // users on the system we may need to retry the test in case we |
| // are unable to remove the existing file. |
| int retries = 5; |
| while(!runTest() && --retries > 0); |
| |
| if(retries == 0) { |
| throw new RuntimeException("Test failed after 5 retries. " + |
| "Remove any /tmp/.java_pid* files and retry."); |
| } |
| } |
| |
| public static boolean runTest() throws Exception { |
| ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( |
| "-XX:+UnlockDiagnosticVMOptions", "-XX:+PauseAtStartup", "AttachWithStalePidFileTarget"); |
| Process target = pb.start(); |
| Path pidFile = null; |
| |
| try { |
| int pid = getUnixProcessId(target); |
| |
| // create the stale .java_pid file. use hard-coded /tmp path as in th VM |
| pidFile = createJavaPidFile(pid); |
| if(pidFile == null) { |
| return false; |
| } |
| |
| // wait for vm.paused file to be created and delete it once we find it. |
| waitForAndResumeVM(pid); |
| |
| // unfortunately there's no reliable way to know the VM is ready to receive the |
| // attach request so we have to do an arbitrary sleep. |
| Thread.sleep(5000); |
| |
| HotSpotVirtualMachine vm = (HotSpotVirtualMachine)VirtualMachine.attach(((Integer)pid).toString()); |
| BufferedReader remoteDataReader = new BufferedReader(new InputStreamReader(vm.remoteDataDump())); |
| String line = null; |
| while((line = remoteDataReader.readLine()) != null); |
| |
| vm.detach(); |
| return true; |
| } |
| finally { |
| target.destroy(); |
| target.waitFor(); |
| |
| if(pidFile != null && Files.exists(pidFile)) { |
| Files.delete(pidFile); |
| } |
| } |
| } |
| |
| private static Path createJavaPidFile(int pid) throws Exception { |
| Path pidFile = Paths.get("/tmp/.java_pid" + pid); |
| if(Files.exists(pidFile)) { |
| try { |
| Files.delete(pidFile); |
| } |
| catch(FileSystemException e) { |
| if(e.getReason().equals("Operation not permitted")) { |
| System.out.println("Unable to remove exisiting stale PID file" + pidFile); |
| return null; |
| } |
| throw e; |
| } |
| } |
| return Files.createFile(pidFile, |
| PosixFilePermissions.asFileAttribute(PosixFilePermissions.fromString("rw-------"))); |
| } |
| |
| private static void waitForAndResumeVM(int pid) throws Exception { |
| Path pauseFile = Paths.get("vm.paused." + pid); |
| int retries = 60; |
| while(!Files.exists(pauseFile) && --retries > 0) { |
| Thread.sleep(1000); |
| } |
| if(retries == 0) { |
| throw new RuntimeException("Timeout waiting for VM to start. " + |
| "vm.paused file not created within 60 seconds."); |
| } |
| Files.delete(pauseFile); |
| } |
| |
| private static int getUnixProcessId(Process unixProcess) throws Exception { |
| Field pidField = unixProcess.getClass().getDeclaredField("pid"); |
| pidField.setAccessible(true); |
| return (Integer)pidField.get(unixProcess); |
| } |
| } |