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/*
* Copyright (c) 2024, 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.
*/
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import jdk.test.lib.process.ProcessTools;
import com.sun.jdi.Bootstrap;
import com.sun.jdi.VirtualMachine;
import com.sun.jdi.connect.AttachingConnector;
import com.sun.jdi.connect.Connector;
import com.sun.jdi.connect.IllegalConnectorArgumentsException;
/**
* @test
* @bug 8338708
* @summary Stress test for reattaching to a debuggee
* @library /test/lib
* @modules jdk.jdi
* @run driver ProcessAttachTest
*/
class ReattachStressTestTarg {
public static void main(String args[]) throws Exception {
System.out.println("Debuggee started");
while (true) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
}
}
}
}
public class ReattachStressTest {
public static void main(String[] args) throws Exception {
System.out.println("Test 1: Debuggee start with suspend=n");
runTest("-agentlib:jdwp=transport=dt_socket,server=y,suspend=n");
System.out.println("Test 2: Debuggee start with suspend=y");
runTest("-agentlib:jdwp=transport=dt_socket,server=y,suspend=y");
}
private static void runTest(String jdwpArg) throws Exception {
ProcessBuilder pb = ProcessTools.createTestJavaProcessBuilder(
jdwpArg,
"ReattachStressTestTarg");
Process p = null;
try {
p = pb.start();
// Read the first character of output to make sure we've waited until the
// debuggee is ready. This will be the debug agent's "Listening..." message.
InputStream is = p.getInputStream();
is.read();
// Attach a debugger
tryDebug(p.pid(), is);
} finally {
p.destroyForcibly();
}
}
private static void tryDebug(long pid, InputStream is) throws IOException,
IllegalConnectorArgumentsException {
// Get the ProcessAttachingConnector, which can attach using the pid of the debuggee.
AttachingConnector ac = Bootstrap.virtualMachineManager().attachingConnectors()
.stream()
.filter(c -> c.name().equals("com.sun.jdi.ProcessAttach"))
.findFirst()
.orElseThrow(() -> new RuntimeException("Unable to locate ProcessAttachingConnector"));
// Set the connector's "pid" argument to the pid of the debuggee.
Map<String, Connector.Argument> args = ac.defaultArguments();
Connector.StringArgument arg = (Connector.StringArgument)args.get("pid");
arg.setValue("" + pid);
// Loop that will repeatedly attach and detach from the same debuggee.
for (int i = 0; i < 500; i++) {
System.out.println(i + ": Debugger is attaching to: " + pid + " ...");
// Attach to the debuggee.
VirtualMachine vm = ac.attach(args);
// Drain remaining "Listening..." output. Otherwise too much
// output will buffer up and the debuggee may block until it is cleared.
while (is.available() > 0) {
is.read();
}
// We've attached. Do some things that will send JDWP commands.
System.out.println("Attached!");
System.out.println("JVM name: " + vm.name());
System.out.println("Num threads: " + vm.allThreads().size());
// We're all done with this debugger connection.
vm.dispose();
// Wait for first char of next "Listening..." output.
is.read();
}
System.out.println("Debugger done.");
}
}
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