127 lines
4.6 KiB
Java
127 lines
4.6 KiB
Java
/*
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* Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Map;
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import jdk.test.lib.process.ProcessTools;
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import com.sun.jdi.Bootstrap;
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import com.sun.jdi.VirtualMachine;
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import com.sun.jdi.connect.AttachingConnector;
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import com.sun.jdi.connect.Connector;
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import com.sun.jdi.connect.IllegalConnectorArgumentsException;
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/**
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* @test
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* @bug 8338708
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* @summary Stress test for reattaching to a debuggee
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* @library /test/lib
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* @modules jdk.jdi
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* @run driver ProcessAttachTest
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*/
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class ReattachStressTestTarg {
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public static void main(String args[]) throws Exception {
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System.out.println("Debuggee started");
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while (true) {
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try {
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Thread.sleep(100);
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} catch (InterruptedException e) {
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}
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}
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}
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}
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public class ReattachStressTest {
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public static void main(String[] args) throws Exception {
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System.out.println("Test 1: Debuggee start with suspend=n");
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runTest("-agentlib:jdwp=transport=dt_socket,server=y,suspend=n");
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System.out.println("Test 2: Debuggee start with suspend=y");
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runTest("-agentlib:jdwp=transport=dt_socket,server=y,suspend=y");
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}
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private static void runTest(String jdwpArg) throws Exception {
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ProcessBuilder pb = ProcessTools.createTestJavaProcessBuilder(
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jdwpArg,
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"ReattachStressTestTarg");
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Process p = null;
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try {
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p = pb.start();
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// Read the first character of output to make sure we've waited until the
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// debuggee is ready. This will be the debug agent's "Listening..." message.
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InputStream is = p.getInputStream();
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is.read();
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// Attach a debugger
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tryDebug(p.pid(), is);
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} finally {
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p.destroyForcibly();
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}
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}
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private static void tryDebug(long pid, InputStream is) throws IOException,
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IllegalConnectorArgumentsException {
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// Get the ProcessAttachingConnector, which can attach using the pid of the debuggee.
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AttachingConnector ac = Bootstrap.virtualMachineManager().attachingConnectors()
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.stream()
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.filter(c -> c.name().equals("com.sun.jdi.ProcessAttach"))
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.findFirst()
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.orElseThrow(() -> new RuntimeException("Unable to locate ProcessAttachingConnector"));
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// Set the connector's "pid" argument to the pid of the debuggee.
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Map<String, Connector.Argument> args = ac.defaultArguments();
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Connector.StringArgument arg = (Connector.StringArgument)args.get("pid");
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arg.setValue("" + pid);
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// Loop that will repeatedly attach and detach from the same debuggee.
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for (int i = 0; i < 500; i++) {
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System.out.println(i + ": Debugger is attaching to: " + pid + " ...");
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// Attach to the debuggee.
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VirtualMachine vm = ac.attach(args);
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// Drain remaining "Listening..." output. Otherwise too much
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// output will buffer up and the debuggee may block until it is cleared.
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while (is.available() > 0) {
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is.read();
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}
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// We've attached. Do some things that will send JDWP commands.
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System.out.println("Attached!");
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System.out.println("JVM name: " + vm.name());
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System.out.println("Num threads: " + vm.allThreads().size());
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// We're all done with this debugger connection.
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vm.dispose();
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// Wait for first char of next "Listening..." output.
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is.read();
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}
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System.out.println("Debugger done.");
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}
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}
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