/* Handle the keyboard interrupt signal
 * Loop infinitely, until we interrupt.
 * This demonstrates that we can return from a handler
 * to the code that it was executing when the signal
 * arrived. This is not a typical use of a signal-handler.
 * Typically, we want to exit from the program.
 * But it demonstrates that the flow is different between signal-handling and exception-handling.
 */

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

int quit = 0;

void handler (int signal) {
	printf("\nCaught signal %d\n", signal);
	printf( "The signal we caught is equal to SIGINT: %d\n", signal==SIGINT);
	quit = 1;
	
	return;
	//exit(-1); //to terminate
}

int main () {
	// SIGINT "program interrupt" signal, the signal is sent when the user type
	// INTR character, usually Ctrl+c 
	signal(SIGINT, *handler); 
	
	while (!quit) {
		printf("blah\n");
		int a = 0;
		for (int i = 0; i < 1000000; i++) {
            if (i%2 == 0) {
                a += 1;
            }
            else {
                a -= 1;
            }
		}
	}
	printf("\nCleaning up\n");
	
	return 0;
}