test/hotspot/jtreg/runtime/posixSig/TestPosixSig.java

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/*
 * @test TestPosixSig.java
 * @bug 8292559
 * @summary test that -XX:+CheckJNICalss displays changed signal handlers.
 * @requires os.family != "windows"
 * @library /test/lib
 * @run driver TestPosixSig
 */

import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;

public class TestPosixSig {

    private static native void changeSigActionFor(int val);

    public static void main(String[] args) throws Throwable {
        // Get the library path property.
        String libpath = System.getProperty("java.library.path");

        if (args.length == 0) {

            // Create a new java process for the TestPsig Java/JNI test.
            // We run the VM in interpreted mode, because the JIT might mark
            // a Java method as not-entrant, which means turning the first instruction
            // into an illegal one. Calling such a method after establishing
            // the new SIGILL signal handler with TestPosixSig.changeSigActionFor(4)
            // below, but before the JNI checker noted and reacted on this signal handler
            // modification, the JVM may crash or hang in an endless loop, where the
            // illegal instruction will be continously executed, raising SIGILL, and
            // the signal handler will return to the illegal instruction again...
            ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder(
                "-XX:+CheckJNICalls",
                "-Xint",
                "-Djava.library.path=" + libpath + ":.",
                "TestPosixSig", "dummy");

            // Start the process and check the output.
            OutputAnalyzer output = new OutputAnalyzer(pb.start());
            String outputString = output.getOutput();
            if (!outputString.contains("Warning: SIGILL handler modified!") ||
                !outputString.contains("Warning: SIGFPE handler modified!")) {
                System.out.println("output: " + outputString);
                throw new RuntimeException("Test failed, missing signal Warning");
            }
            output.shouldHaveExitValue(0);

        } else {
            System.loadLibrary("TestPsig");
            TestPosixSig.changeSigActionFor(8); // SIGFPE
            TestPosixSig.changeSigActionFor(4); // SIGILL
            Thread.sleep(600);
        }
    }
}