gistfile1.txt

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

int main(void)
{
	int up[2];
	int down[2];
	
	pipe(up);
	pipe(down);

	if(fork() == 0)
	{	
		close(up[0]);
		close(down[1]);
		int passenger_location = rand()%11; 
		int lift_location;
		int bIsInLift = 0;
		
		do
		{		
			write(up[1], &passenger_location, sizeof(passenger_location)); // WRITE PASSENGER LOCATION
			
			read(down[0], &lift_location, sizeof(lift_location));
			
			if(bIsInLift)
			{
				//Waiting in lift
				//NOW SELECT NEW FLOOR
				int new_location = rand()%11;
				write(up[1], new_location, sizeof(new_location));
				sleep(1);
				
				read(down[0], %
			}
			else if(passenger_location != lift_location)
			{
				printf("PASSENGER: I AM ON FLOOR: %d, THE LIFT MONITOR SAYS IT IS ON FLOOR: %d\n", passenger_location, lift_location);			
			}
			else
			{
				bIsInLift = 1;
				write(up[1], &bIsInLift, sizeof(bIsInLift)); // IM IN THE LIFT
			}	
			
		}
		while(lift_location != 10);
	} 
	else
	{	
		close(up[1]);
		close(down[0]);		
		int lift_location = 0;
		int passenger_location;
		int bPassengerAboard = 0;

		do
		{
			read(up[0], &passenger_location, sizeof(passenger_location));
				
			if (lift_location != passenger_location)
			{
				sleep(2); // TRAVEL
				
				if (lift_location < passenger_location) // LESS
				{
					lift_location++;		
				}
				else
				{
					lift_location--;
				}
				printf("Lift: Now at floor %d\n", lift_location);					
			}			
			write(down[1], &lift_location, sizeof(lift_location)); // WRITE MY LOCATION
											
		}
		while(lift_location != 10);
		
	}
	return 0;
}