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/*
* Copyright (c) 2003, 2015, 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.
*/
/* @test
* @bug 4531526
* @summary Test that more than one debuggee cannot bind to same port
* at the same time.
* @library /lib/testlibrary
*
* @modules java.management
* jdk.jdi
* @build jdk.testlibrary.* VMConnection ExclusiveBind HelloWorld
* @run driver ExclusiveBind
*/
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.ArrayList;
import java.util.Map;
import java.util.List;
import java.util.Iterator;
import java.util.concurrent.TimeUnit;
import jdk.testlibrary.ProcessTools;
import jdk.testlibrary.Utils;
public class ExclusiveBind {
/*
* 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 ProcessBuilder prepareLauncher(String address, boolean suspend, String class_name) throws Exception {
List<String> args = new ArrayList<>();
for(String dbgOption : VMConnection.getDebuggeeVMOptions().split(" ")) {
if (!dbgOption.trim().isEmpty()) {
args.add(dbgOption);
}
}
String lib = "-agentlib:jdwp=transport=dt_socket,server=y,suspend=";
if (suspend) {
lib += "y";
} else {
lib += "n";
}
lib += ",address=" + address;
args.add(lib);
args.add(class_name);
return ProcessTools.createJavaProcessBuilder(args.toArray(new String[args.size()]));
}
/*
* - 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
ProcessBuilder process1 = prepareLauncher(address, true, "HelloWorld");
// start the debuggee and wait for the "ready" message
Process p = ProcessTools.startProcess(
"process1",
process1,
line -> line.equals("Listening for transport dt_socket at address: " + address),
Utils.adjustTimeout(5000),
TimeUnit.MILLISECONDS
);
// launch a second debuggee with the same address
ProcessBuilder process2 = prepareLauncher(address, false, "HelloWorld");
// get exit status from second debuggee
int exitCode = ProcessTools.startProcess("process2", 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");
}
}
}
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