#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
 
static void catch_function(int signal) {
    puts("Interactive attention signal caught.");
}
 
int main(void) {
    if (signal(SIGINT, catch_function) == SIG_ERR) {
        fputs("An error occurred while setting a signal handler.\n", stderr);
        return EXIT_FAILURE;
    }
    puts("Raising the interactive attention signal.");
    if (raise(SIGINT) != 0) {
        fputs("Error raising the signal.\n", stderr);
        return EXIT_FAILURE;
    }

    while(1)
    {

    }

    puts("Exiting.");
    return 0;
}