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

#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/time.h>


int main(int argc, char** argv)
{
	int f = 0;
	int n = 3;
	int i = 0;
	int fChild = 0;
	int pid;
	int status = 0;
	int time_to_run = 30;
	int dummy = 0;
	struct rusage ruse;	
	struct timeval start_time;
	struct timeval cur_time;


	printf("Enter #ofprocs, time_to_run\n");
	scanf("%d %d", &n, &time_to_run);

	gettimeofday(&start_time, NULL);

	printf("Forking new process.\n");
	/* Fork n processes */
	for (i = 0; i < n; i++)
	{
		f = fork();
		if (f == 0)
		{
			printf("Child created - pid %d.\n", getpid());
			fChild = 1;
			break;
		}
	}
	
	if (fChild == 1)
	{
		/* Set their own lottery tickets */


		/* Do some work for some time - say 30secs of actual time */
		do
		{
			dummy++;
			gettimeofday(&cur_time, NULL);
		} while (cur_time.tv_sec - start_time.tv_sec < time_to_run);
	}
	else
	{
		/* parent */
		/* Wait for all three to finish, grab their resources */
		while ( (pid = wait4(-1, &status, 0, &ruse)) != -1)
		{
			/* Print statistics */
			printf("Pid %d finished.\n", pid);
			printf("\tTime - user %ld, sys %ld\n", ruse.ru_utime.tv_sec, ruse.ru_stime.tv_sec);	
			printf("\tTime - user %ld, sys %ld\n", ruse.ru_utime.tv_usec, ruse.ru_stime.tv_usec);	
		}
	}

	return 0;
}