InheritHandle.java

/*
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 * 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 4945514 8042581
 * @summary DatagramSocket should make handle not inherited
 */

import java.net.BindException;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

public class InheritHandle {
    private static final long SLEEPTIME_MS = 1000L;

    public static void main(String[] args) throws Exception {
        int port;
        try (DatagramSocket sock = new DatagramSocket(0);) {
            sock.setReuseAddress(true);
            port = sock.getLocalPort();

            /**
             * spawn a child to check whether handle passed to it or not; it
             * shouldn't
             */
            Runtime.getRuntime().exec("sleep 10");
        }

        try (DatagramSocket sock = new DatagramSocket(null);) {
            sock.setReuseAddress(true);
            int retries = 0;
            boolean isWindows = System.getProperty("os.name").startsWith("Windows");
            InetSocketAddress addr = new InetSocketAddress(port);
            while (true) {
                try {
                    sock.bind(addr);
                    break;
                } catch (BindException e) {
                    if (isWindows && retries++ < 5) {
                        Thread.sleep(SLEEPTIME_MS);
                        System.out.println("BindException \"" + e.getMessage() + "\", retrying...");
                        continue;
                    } else {
                        throw e;
                    }
                }
            }

        }
    }
}