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/*
 * @test
 * @summary verifies that failure in AttachListener::dequeue does not crash the VM
 * @bug 8356177
 * @library /test/lib
 * @modules jdk.attach/sun.tools.attach
 *
 * @run driver FailedDequeueTest
 */

import java.io.IOException;

import com.sun.tools.attach.VirtualMachine;
import sun.tools.attach.HotSpotVirtualMachine;

import jdk.test.lib.apps.LingeredApp;

public class FailedDequeueTest {

    public static void main(String[] args) throws Exception {
        LingeredApp app = null;
        try {
            app = LingeredApp.startApp("-Xlog:attach=trace");
            test(app);
        } finally {
            LingeredApp.stopApp(app);
        }
    }

    // The test uses HotSpotVirtualMachine.setFlag method with long flag value (longer than 256K).
    private static String flagName = "HeapDumpPath";
    private static String flagValue = "X" + "A".repeat(256 * 1024) + "X";

    private static void test(LingeredApp app) throws Exception {
        HotSpotVirtualMachine vm = (HotSpotVirtualMachine)VirtualMachine.attach(String.valueOf(app.getPid()));
        try {
            // Should throw IOException and don't crash
            vm.setFlag(flagName, flagValue);

            throw new RuntimeException("expected IOException is not thrown");
        } catch (IOException ex) {
            System.out.println("OK: setFlag thrown expected exception:");
            ex.printStackTrace(System.out);
        } finally {
            vm.detach();
        }
    }
}