211 lines
8.0 KiB
Java
211 lines
8.0 KiB
Java
/*
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* Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import static java.lang.Long.parseLong;
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import static java.lang.System.getProperty;
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import static java.nio.file.Files.readAllBytes;
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import static java.util.Arrays.stream;
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import static java.util.stream.Collectors.joining;
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import static java.util.stream.Collectors.toList;
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import static jdk.test.lib.process.ProcessTools.createJavaProcessBuilder;
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import static jdk.test.lib.Platform.isWindows;
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import jdk.test.lib.Utils;
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import jtreg.SkippedException;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.util.Collection;
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import java.util.Optional;
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import java.util.stream.Stream;
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/*
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* @test TestInheritFD
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* @bug 8176717 8176809 8222500
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* @summary a new process should not inherit open file descriptors
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* @comment On Aix lsof requires root privileges.
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* @requires os.family != "aix"
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* java.management
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* @run driver TestInheritFD
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*/
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/**
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* Test that HotSpot does not leak logging file descriptors.
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*
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* This test is performed in three steps. The first VM starts a second VM with
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* gc logging enabled. The second VM starts a third VM and redirects the third
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* VMs output to the first VM, it then exits and hopefully closes its log file.
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*
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* The third VM waits for the second to exit and close its log file. After that,
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* the third VM tries to rename the log file of the second VM. If it succeeds in
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* doing so it means that the third VM did not inherit the open log file
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* (windows can not rename opened files easily)
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*
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* The third VM communicates the success to rename the file by printing "CLOSED
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* FD". The first VM checks that the string was printed by the third VM.
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*
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* On unix like systems "lsof" or "pfiles" is used.
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*/
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public class TestInheritFD {
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public static final String LEAKS_FD = "VM RESULT => LEAKS FD";
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public static final String RETAINS_FD = "VM RESULT => RETAINS FD";
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public static final String EXIT = "VM RESULT => VM EXIT";
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public static final String LOG_SUFFIX = ".strangelogsuffixthatcanbecheckedfor";
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// first VM
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public static void main(String[] args) throws Exception {
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String logPath = Utils.createTempFile("logging", LOG_SUFFIX).toFile().getName();
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File commFile = Utils.createTempFile("communication", ".txt").toFile();
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if (!isWindows() && !lsofCommand().isPresent()) {
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throw new SkippedException("Could not find lsof like command");
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}
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ProcessBuilder pb = createJavaProcessBuilder(
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"-Xlog:gc:\"" + logPath + "\"",
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"-Dtest.jdk=" + getProperty("test.jdk"),
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VMStartedWithLogging.class.getName(),
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logPath);
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pb.redirectOutput(commFile); // use temp file to communicate between processes
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pb.start();
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String out = "";
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do {
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out = new String(readAllBytes(commFile.toPath()));
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Thread.sleep(100);
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System.out.println("SLEEP 100 millis");
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} while (!out.contains(EXIT));
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System.out.println(out);
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if (out.contains(RETAINS_FD)) {
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System.out.println("Log file was not inherited by third VM");
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} else {
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throw new RuntimeException("could not match: " + RETAINS_FD);
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}
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}
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static class VMStartedWithLogging {
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// second VM
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public static void main(String[] args) throws IOException, InterruptedException {
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ProcessBuilder pb = createJavaProcessBuilder(
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"-Dtest.jdk=" + getProperty("test.jdk"),
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VMShouldNotInheritFileDescriptors.class.getName(),
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args[0],
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"" + ProcessHandle.current().pid());
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pb.inheritIO(); // in future, redirect information from third VM to first VM
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pb.start();
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if (!isWindows()) {
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System.out.println("(Second VM) Open file descriptors:\n" + outputContainingFilenames().stream().collect(joining("\n")));
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}
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}
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}
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static class VMShouldNotInheritFileDescriptors {
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// third VM
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public static void main(String[] args) throws InterruptedException {
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try {
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File logFile = new File(args[0]);
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long parentPid = parseLong(args[1]);
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fakeLeakyJVM(false); // for debugging of test case
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if (isWindows()) {
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windows(logFile, parentPid);
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} else {
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Collection<String> output = outputContainingFilenames();
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System.out.println("(Third VM) Open file descriptors:\n" + output.stream().collect(joining("\n")));
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System.out.println(findOpenLogFile(output) ? LEAKS_FD : RETAINS_FD);
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}
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} catch (Exception e) {
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System.out.println(e.toString());
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} finally {
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System.out.println(EXIT);
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}
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}
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}
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// for debugging of test case
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@SuppressWarnings("resource")
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static void fakeLeakyJVM(boolean fake) {
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if (fake) {
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try {
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new FileOutputStream("fakeLeakyJVM" + LOG_SUFFIX, false);
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} catch (FileNotFoundException e) {
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}
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}
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}
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static Stream<String> run(String... args){
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try {
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return new BufferedReader(new InputStreamReader(new ProcessBuilder(args).start().getInputStream())).lines();
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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static Optional<String[]> lsofCommandCache = stream(new String[][]{
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{"/usr/bin/lsof", "-p"},
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{"/usr/sbin/lsof", "-p"},
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{"/bin/lsof", "-p"},
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{"/sbin/lsof", "-p"},
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{"/usr/local/bin/lsof", "-p"},
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{"/usr/bin/pfiles", "-F"}}) // Solaris
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.filter(args -> new File(args[0]).exists())
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.findFirst();
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static Optional<String[]> lsofCommand() {
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return lsofCommandCache;
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}
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static Collection<String> outputContainingFilenames() {
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long pid = ProcessHandle.current().pid();
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String[] command = lsofCommand().orElseThrow(() -> new RuntimeException("lsof like command not found"));
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System.out.println("using command: " + command[0] + " " + command[1]);
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return run(command[0], command[1], "" + pid).collect(toList());
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}
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static boolean findOpenLogFile(Collection<String> fileNames) {
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return fileNames.stream()
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.filter(fileName -> fileName.contains(LOG_SUFFIX))
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.findAny()
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.isPresent();
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}
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static void windows(File f, long parentPid) throws InterruptedException {
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System.out.println("waiting for pid: " + parentPid);
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ProcessHandle.of(parentPid).ifPresent(handle -> handle.onExit().join());
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System.out.println("trying to rename file to the same name: " + f);
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System.out.println(f.renameTo(f) ? RETAINS_FD : LEAKS_FD); // this parts communicates a closed file descriptor by printing "VM RESULT => RETAINS FD"
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}
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}
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