/*
    signaltest.c
    
    Started by Jeff Ondich on 3/26/96
    Last modified 16 February 2022
    
    This program gives a simple example of how a process
    can catch a signal.  Here, SIGINT signals (typically
    generated by the user hitting CTL-C) are caught.
*/

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

const long limit = 20000000000;
const long frequency = 50000000;

void interrupt_handler(int);

int main() {
    long i;

    /* The initial handler for the SIGINT signal is
       assuredly the default, so confusion will not reign */
    if (signal(SIGINT, interrupt_handler) != SIG_DFL) {
        fprintf( stderr, "I'm confused.\n" );
    }

    /* Start counting. */
    for (i=0; i < limit; i++) {
        if (i % frequency == 0) {
            fprintf(stderr, "%ld\n", i);
            fflush(stderr);
        }
    }

    return 0;
}


void interrupt_handler( int sig ) {
    fprintf(stderr, "Sorry, but I just don't want to quit.\n");
    fflush(stderr);
}