How to Intercept Ctrl C in Java CLI Applications Across Platforms?

Intercepting Ctrl C in CLI Java Applications

In a command line interface (CLI) application, capturing Ctrl C can prove invaluable. This key combination, which typically terminates the process, can be redirected to execute custom actions. Achieving this functionality consistently across platforms poses a challenge.

Multi-Platform Solution

For Unix and Solaris, you can utilize the SignalHandler class from the sun.misc package. This class enables interception of the SIGINT signal generated by Ctrl C.

import sun.misc.Signal;
import sun.misc.SignalHandler;

class CtrlCHandler implements SignalHandler {
    public void handle(Signal signal) {
        // Your custom Ctrl+C handling logic
    }
}

Signal.handle(new Signal("INT"), new CtrlCHandler());

For Windows, a similar approach can be employed using the Runtime class and a shutdown hook.

Runtime.getRuntime().addShutdownHook(new Thread() {
    public void run() {
        // Your custom Ctrl+C handling logic
    }
});

However, this technique only allows for intermediate interception before the JVM shuts down.

Alternative Approach

Instead of using the methods mentioned above, consider utilizing a different method for reading characters from standard input, such as System.in.read(). This approach provides direct control over input handling, including the ability to intercept Ctrl C.

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