diff -r fd16c54261b3 -r 90ce3da70b43 jdk/test/com/sun/jdi/ExclusiveBind.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/com/sun/jdi/ExclusiveBind.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,168 @@
+/*
+ * Copyright 2003-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/* @test
+ * @bug 4531526
+ * @summary Test that more than one debuggee cannot bind to same port
+ *          at the same time.
+ *
+ * @build VMConnection ExclusiveBind HelloWorld
+ * @run main ExclusiveBind
+ */
+import java.io.InputStream;
+import java.io.IOException;
+import java.io.File;
+import java.net.ServerSocket;
+import com.sun.jdi.Bootstrap;
+import com.sun.jdi.VirtualMachine;
+import com.sun.jdi.connect.Connector;
+import com.sun.jdi.connect.AttachingConnector;
+import java.util.Map;
+import java.util.List;
+import java.util.Iterator;
+
+public class ExclusiveBind {
+
+    /*
+     * Helper class to direct process output to the parent
+     * System.out
+     */
+    static class IOHandler implements Runnable {
+        InputStream in;
+
+        IOHandler(InputStream in) {
+            this.in = in;
+        }
+
+        static void handle(InputStream in) {
+            IOHandler handler = new IOHandler(in);
+            Thread thr = new Thread(handler);
+            thr.setDaemon(true);
+            thr.start();
+        }
+
+        public void run() {
+            try {
+                byte b[] = new byte[100];
+                for (;;) {
+                    int n = in.read(b);
+                    if (n < 0) return;
+                    for (int i=0; i<n; i++) {
+                        System.out.print((char)b[i]);
+                    }
+                }
+            } catch (IOException ioe) { }
+        }
+
+    }
+
+    /*
+     * Find a connector by name
+     */
+    private static Connector findConnector(String name) {
+        List connectors = Bootstrap.virtualMachineManager().allConnectors();
+        Iterator iter = connectors.iterator();
+        while (iter.hasNext()) {
+            Connector connector = (Connector)iter.next();
+            if (connector.name().equals(name)) {
+                return connector;
+            }
+        }
+        return null;
+    }
+
+    /*
+     * Launch (in server mode) a debuggee with the given address and
+     * suspend mode.
+     */
+    private static Process launch(String address, boolean suspend, String class_name) throws IOException {
+        String exe = System.getProperty("java.home") + File.separator + "bin" +
+            File.separator;
+        String arch = System.getProperty("os.arch");
+        if (arch.equals("sparcv9")) {
+            exe += "sparcv9/java";
+        } else {
+            exe += "java";
+        }
+        String cmd = exe + " " + VMConnection.getDebuggeeVMOptions() +
+            " -agentlib:jdwp=transport=dt_socket,server=y,suspend=";
+        if (suspend) {
+            cmd += "y";
+        } else {
+            cmd += "n";
+        }
+        cmd += ",address=" + address + " " + class_name;
+
+        System.out.println("Starting: " + cmd);
+
+        Process p = Runtime.getRuntime().exec(cmd);
+        IOHandler.handle(p.getInputStream());
+        IOHandler.handle(p.getErrorStream());
+
+        return p;
+    }
+
+    /*
+     * - pick a TCP port
+     * - Launch a debuggee in server=y,suspend=y,address=${port}
+     * - Launch a second debuggee in server=y,suspend=n with the same port
+     * - Second debuggee should fail with an error (address already in use)
+     * - For clean-up we attach to the first debuggee and resume it.
+     */
+    public static void main(String args[]) throws Exception {
+        // find a free port
+        ServerSocket ss = new ServerSocket(0);
+        int port = ss.getLocalPort();
+        ss.close();
+
+        String address = String.valueOf(port);
+
+        // launch the first debuggee
+        Process process1 = launch(address, true, "HelloWorld");
+
+        // give first debuggee time to suspend
+        Thread.currentThread().sleep(5000);
+
+        // launch a second debuggee with the same address
+        Process process2 = launch(address, false, "HelloWorld");
+
+        // get exit status from second debuggee
+        int exitCode = process2.waitFor();
+
+        // clean-up - attach to first debuggee and resume it
+        AttachingConnector conn = (AttachingConnector)findConnector("com.sun.jdi.SocketAttach");
+        Map conn_args = conn.defaultArguments();
+        Connector.IntegerArgument port_arg =
+            (Connector.IntegerArgument)conn_args.get("port");
+        port_arg.setValue(port);
+        VirtualMachine vm = conn.attach(conn_args);
+        vm.resume();
+
+        // if the second debuggee ran to completion then we've got a problem
+        if (exitCode == 0) {
+            throw new RuntimeException("Test failed - second debuggee didn't fail to bind");
+        } else {
+            System.out.println("Test passed - second debuggee correctly failed to bind");
+        }
+    }
+}