How to Gracefully Handle Ctrl-C Events in C ?

Catching Ctrl-C Events in C

In C , capturing Ctrl-C (SIGINT) events is crucial for handling graceful program termination. The signal library provides a straightforward mechanism for this, but its reliability varies across different implementations.

To ensure consistent behavior, it's recommended to use the sigaction function instead. Here's a revised version of Tom's code using sigaction:

#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

void my_handler(int s) {
    printf("Caught signal %d\n", s);
    exit(1);
}

int main(int argc, char** argv) {

    struct sigaction sigIntHandler;

    sigIntHandler.sa_handler = my_handler;
    sigemptyset(&sigIntHandler.sa_mask);
    sigIntHandler.sa_flags = 0;

    sigaction(SIGINT, &sigIntHandler, NULL);

    pause();

    return 0;
}

This code defines a signal handler, my_handler, that prints a message and exits the program when a SIGINT signal (Ctrl-C) is received. The sigaction function registers the handler for the SIGINT signal and sets the necessary flags for correct behavior.

Now, when the program is running and Ctrl-C is pressed, it will catch the signal and invoke the handler, which in turn prints the appropriate message and terminates the program gracefully.

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