/*

 * Copyright (c) 2006, 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.

 *

 * 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.

 */

/*

 * author Edward Wang

 *

 * @test

 * @bug 6368984

 * @key intermittent

 * @summary Configuring unconnected Socket before passing to implAccept

 *          can cause fd leak.

 *          This test may fail intermittently if foreign processes will

 *          try to establish connection to the test server socket.

 * @requires (os.family != "windows")

 * @library /test/lib

 * @build jdk.test.lib.Utils

 *        jdk.test.lib.Asserts

 *        jdk.test.lib.JDKToolFinder

 *        jdk.test.lib.JDKToolLauncher

 *        jdk.test.lib.Platform

 *        jdk.test.lib.process.*

 *        AcceptCauseFileDescriptorLeak

 * @run main/othervm AcceptCauseFileDescriptorLeak root

 * @run main/othervm -Djdk.net.usePlainSocketImpl AcceptCauseFileDescriptorLeak root

 */

import java.io.IOException;

import java.net.InetAddress;

import java.net.InetSocketAddress;

import java.net.ServerSocket;

import java.net.Socket;

import java.util.List;

import jdk.test.lib.JDKToolFinder;

import jdk.test.lib.process.OutputAnalyzer;

public class AcceptCauseFileDescriptorLeak {

    private static final int REPS = 2048;

    private static final int THRESHOLD = 1024;

    public static void main(String[] args) throws Exception {

        if (args.length != 0) {

            OutputAnalyzer analyzer = execCmd("ulimit -n -H");

            String output = analyzer.getOutput();

            if (output == null || output.length() == 0) {

                throw new RuntimeException("\"ulimit -n -H\" output nothing"

                        + " and its exit code is " + analyzer.getExitValue());

            } else {

                output = output.trim();

                // Set max open file descriptors to 1024

                // if it is unlimited or greater than 1024,

                // otherwise just do test directly

                if ("unlimited".equals(output)

                        || Integer.valueOf(output) > THRESHOLD) {

                    analyzer = execCmd("ulimit -n " + THRESHOLD + "; "

                            + composeJavaTestStr());

                    System.out.println("Output: ["

                            + analyzer.getOutput() + "]");

                    int rc = analyzer.getExitValue();

                    if (rc != 0) {

                        throw new RuntimeException(

                                "Unexpected exit code: " + rc);

                    }

                    return;

                }

            }

        }

        final ServerSocket ss = new ServerSocket() {

            public Socket accept() throws IOException {

                Socket s = new Socket() {

                };

                s.setSoTimeout(10000);

                implAccept(s);

                return s;

            }

        };

        ss.bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));

        Thread t = new Thread(new Runnable() {

            public void run() {

                int repsCompleted = 0;

                try {

                    for (; repsCompleted < REPS; repsCompleted++) {

                        (new Socket(InetAddress.getLoopbackAddress(), ss.getLocalPort())).close();

                    }

                } catch (IOException e) {

                    e.printStackTrace();

                } finally {

                    System.out.println("Client iterations completed:" + repsCompleted);

                }

            }

        });

        t.start();

        int repsCompleted = 0;

        try {

            for (; repsCompleted < REPS; repsCompleted++) {

                ss.accept().close();

            }

        } finally {

            System.out.println("Server iterations completed:" + repsCompleted);

            ss.close();

        }

        t.join();

    }

    /**

     * Execute command with shell

     *

     * @param  command

     * @return OutputAnalyzer

     * @throws IOException

     */

    static OutputAnalyzer execCmd(String command) throws IOException {

        List<String> cmd = List.of("sh", "-c", command);

        System.out.println("Executing: " + cmd);

        ProcessBuilder pb = new ProcessBuilder(cmd);

        return new OutputAnalyzer(pb.start());

    }

    static String composeJavaTestStr() {

        return JDKToolFinder.getTestJDKTool("java") + " "

                + AcceptCauseFileDescriptorLeak.class.getName();

    }

}