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    <p>Warning, this is <strong>not</strong> what you should do. <a href="http://www.oracle.com/technetwork/java/faq-sun-packages-142232.html" rel="nofollow">The usual reasons</a> for avoiding the sun package apply. Think thrice before actually using this in real code. At minimum the access to the signal handling should be done with reflection and fall back to registering the usual shutdown hook when it fails. I left that out for brevity.</p> <p>So, all hope abandon, ye who enter here:</p> <pre><code>import java.util.concurrent.atomic.AtomicBoolean; import sun.misc.Signal; import sun.misc.SignalHandler; public class Sigint { private static void prepareShutdownHandling() { // This would be the normal shutdown hook final Thread shutdown = new Thread() { @Override public void run() { // Simulate slow shutdown for (int i = 0; i &lt; 10; i++) { System.out.println("Normal shutdown running"); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(System.err); } } System.out.println("Normal shutdown finished"); System.exit(0); } }; Signal.handle(new Signal("INT"), new SignalHandler() { private AtomicBoolean inShutdown = new AtomicBoolean(); public void handle(Signal sig) { if (inShutdown.compareAndSet(false, true)) { // Normal shutdown shutdown.start(); } else { System.err.println("Emergency shutdown"); System.exit(1); } } }); } public static void main(String args[]) { prepareShutdownHandling(); while (true) { System.out.println("Main program running"); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(System.err); } } } } </code></pre>
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    1. POCatch multiple Ctrl+C keypresses in Java to do graceful and forced shutdowns
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    1. COThanks for an elegant solution! So essentially what it boils down to is that it is impossible to do the signal handling required in a portable / cross-platform way using Java? (without using sun.* libraries) Or perhaps really in any language if signal handling varies much between platforms?
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    2. CO@Nils I'd hardly call it elegant :-D. AFAIK there's no portable way, and the *supported* non-portable way (signal chaining) runs the handlers after the usual signal handling so I presume it would not work (I haven't tried). But maybe someone comes up with a more reliable hack.
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    3. COLooks like the way to do it without sun.* is: the default SIGINT handler can be suppressed with -Xrs parameter. Then the signal handling can be done in native code. Not great for portability that solution either - neither the command line switch nor the native code.
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