test/jdk/com/sun/tools/attach/warnings/Application.java

/*
 * Copyright (c) 2023, 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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import java.io.DataOutputStream;
import java.net.InetAddress;
import java.net.Socket;

/**
 * The "application" launched by DyamicLoadWarningTest.
 *
 * The application phones home, sends its pid to the test, waits for a reply, then exits.
 */
public class Application {
    public static void main(String[] args) throws Exception {
        InetAddress lh = InetAddress.getLoopbackAddress();
        int port = Integer.parseInt(args[0]);
        try (Socket s = new Socket(lh, port);
             DataOutputStream out = new DataOutputStream(s.getOutputStream())) {

            // send pid
            long pid = ProcessHandle.current().pid();
            out.writeLong(pid);

            // wait for shutdown
            s.getInputStream().read();
        }
    }
}