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/*
* Copyright (c) 2013, 2016, 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
* @modules java.base/jdk.internal.misc:open
* @modules java.base/java.lang:open
* @modules jdk.attach/sun.tools.attach
* @library /test/lib
* @run main AttachWithStalePidFile
*/
import jdk.test.lib.Platform;
import jdk.test.lib.process.ProcessTools;
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);
waitForTargetReady(target);
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 void waitForTargetReady(Process target) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(target.getInputStream()));
String line = br.readLine();
// wait for the ready message having been printed or EOF (line == null)
while (line != null && !line.equals(AttachWithStalePidFileTarget.READY_MSG)) {
line = br.readLine();
}
// target VM ready
}
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().matches("Operation not permitted|Not owner")) {
System.out.println("Unable to remove exisiting stale PID file" + pidFile);
System.out.println("===================================================");
e.printStackTrace(System.out);
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);
}
}
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