How to Prevent Ctrl C from Terminating Your Java CLI Application?

Interception of Ctrl C in CLI Java Applications

Problem: How to handle Ctrl C events in a CLI Java application to prevent process termination?

Context: The default behavior for Ctrl C in CLI applications is to terminate the process, but for certain applications, it may be necessary to intercept this signal and execute specific actions instead.

Solution:

To intercept Ctrl C in a multi-platform CLI Java application, you can employ one of the following methods:

Runtime Shutdown Hook:

Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
        // Your shutdown code that handles Ctrl+C
    }
});

This method will execute your code when the JVM shuts down as a result of Ctrl C. However, it may not provide complete control over the signal handling.

SignalHandler:

public class SignalHandler {

    public static void registerCtrlCHandler() {
        try {
            Signal.handle(new Signal("INT"), (s) -> {
                // Your Ctrl+C handling logic here
            });
        } catch (Exception e) {
            // Handle exception
        }
    }
}

Using the SignalHandler from the sun.misc package, you can intercept the SIGINT signal, which is triggered by Ctrl C, and perform custom actions within your application. This provides more granular control over the signal handling.

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