test/hotspot/jtreg/serviceability/attach/RemovingUnixDomainSocketTest.java

/*
 * Copyright (c) 2019, 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.
 *
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 */

/*
 * @test
 * @bug 8225193
 * @requires os.family != "windows"
 * @library /test/lib
 * @run main RemovingUnixDomainSocketTest
 */

import java.io.File;
import java.io.IOException;
import java.nio.file.Path;
import java.util.concurrent.TimeUnit;

import jdk.test.lib.Utils;
import jdk.test.lib.apps.LingeredApp;
import jdk.test.lib.JDKToolLauncher;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;

public class RemovingUnixDomainSocketTest {

    // timeout (in seconds)
    private static final long timeout = Utils.adjustTimeout(60);

    private static void runJCmd(long pid) throws InterruptedException, IOException {
        JDKToolLauncher jcmd = JDKToolLauncher.createUsingTestJDK("jcmd");
        jcmd.addToolArg(Long.toString(pid));
        jcmd.addToolArg("VM.version");

        Process jcmdProc = ProcessTools.startProcess("jcmd", new ProcessBuilder(jcmd.getCommand()));

        OutputAnalyzer out = new OutputAnalyzer(jcmdProc);

        if (!jcmdProc.waitFor(timeout, TimeUnit.SECONDS)) {
            log("jcmd is still running after " + timeout + " seconds, terminating...");
            jcmdProc.destroy();
            jcmdProc.waitFor();
        }

        log("jcmd stdout: [" + out.getStdout() + "];\n" +
            "jcmd  stderr: [" + out.getStderr() + "]\n" +
            "jcmd  exitValue = " + out.getExitValue());

        out.shouldHaveExitValue(0)
           .stderrShouldBeEmptyIgnoreVMWarnings();
    }

    public static void main(String... args) throws Exception {
        LingeredApp app = null;
        try {
            app = LingeredApp.startApp();

            // Access to Attach Listener
            runJCmd(app.getPid());

            // Remove unix domain socket file
            File sockFile = Path.of(System.getProperty("java.io.tmpdir"),
                                   ".java_pid" + app.getPid())
                               .toFile();
            log("Remove " + sockFile.toString());
            sockFile.delete();

            // Access to Attach Listener again
            runJCmd(app.getPid());
        } finally {
            LingeredApp.stopApp(app);
        }
    }

    static void log(Object s) {
        System.out.println(String.valueOf(s));
    }
}