/*
- Signal handling example
- Catch control C
- sigaction not used because it is not supported

ECED 3403
27 June 16
*/

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <signal.h> /* Signal handling software */

#define FALSE 0
#define TRUE  1

int waiting_for_signal; /* T|F - indicates whether ^C detected */

void sigint_hdlr()
{
	/*
	- Invoked when SIGINT (control-C) is detected
	- changes state of waiting_for_signal
	- signal must be reinitialized
	*/
	waiting_for_signal = FALSE;
	signal(SIGINT, (_crt_signal_t) sigint_hdlr); /* Reinitialize SIGINT */
}

int main(int argc, char *argv[])
{
	/*
	- Mainline - example of loop waiting for sigint
	*/
	long loop_count;
	int i;

	/* Call signal() - bind sigint_hdlr to SIGINT */
	signal(SIGINT, (_crt_signal_t) sigint_hdlr);

	for (i = 0; i<5; i++)
	{
		printf("Starting %d...\n", i);
		loop_count = 0;
		waiting_for_signal = TRUE;

		while (waiting_for_signal)
			loop_count++;

		printf("All done %ld\n", loop_count);
		getchar();
	}

	getchar();
	return 0;
}