Signal Handling (`signal.h`)

Signals are asynchronous notifications (e.g., SIGINT, SIGTERM). Use signal or the more robust sigaction to install handlers.

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

void handler(int sig) {
    if (sig == SIGINT) {
        printf("\nCaught Ctrl‑C, exiting gracefully...\n");
        exit(0);
    }
}

int main(void) {
    struct sigaction sa = {0};
    sa.sa_handler = handler;
    sigemptyset(&sa.sa_mask);
    sigaction(SIGINT, &sa, NULL);
    while (1) { /* busy work */ }
    return 0;
}