How to Gracefully Intercept Ctrl C in a Java Command Line Application?

Intercepting Ctrl C in a Command Line Application

Intercepting Ctrl C in a CLI Java application allows a different action to be executed instead of the default behavior of terminating the process. Here's a solution to achieve this using platform-specific methods:

Java

Java provides the Runtime.addShutdownHook() method that creates an exit handler thread which runs code when the JVM is shutting down. However, this will only intercept Ctrl C as an intermediate step before the JVM completely closes.

Signal Handling

For cross-platform signal handling, you can use SignalHandler from the sun.misc package. This approach allows intercepting the SIGINT signal caused by Ctrl C on Unix-like systems (including Linux and Solaris).

Example

<code class="java">import sun.misc.Signal;

public class CtrlCInterceptor {

    public static void main(String[] args) {
        Signal.handle(new Signal("INT"), signal -> {
            // Handle Ctrl+C gracefully
            System.out.println("Ctrl+C pressed. Performing cleanup actions...");
        });
    }
}</code>

This code registers a handler for the "INT" signal (Ctrl C) and prints a message when it's received. You can perform any necessary cleanup actions within the handler block.

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