#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>

#include "info.h"


main(void)
{  
    int  i, id;
    struct info *ctrl;
    int v1, v2;
	int choice;

	// create the shared memory segment 
	// .. id is the file identifier of the shared memory segment 
	// .. if the key is shared, any process can attach to this shared memory segment 
	// .. 0666 is the file permission for the shared memory segment
    if ( (id = shmget( KEY,MSIZ,IPC_CREAT | 0666) ) < 0 )
    {
	   //error…; 
	   printf("error 1\n");
	   exit(1) ; 
    }


	// attach a local pointer to the shared memory segment created
	// .. exit if fails
    if ( (ctrl = (struct info *) shmat( id, 0, 0)) <= (struct info *) (0) )
	{
		//error … ; 
     	printf("error 2\n");
		exit(1) ;  
	}
	ctrl->flag=0;
	ctrl->value1=0;
	ctrl->value1=0;
	ctrl->sum=0;
    while(ctrl->flag!=-1)
    {
		//ctrl->flag=0;
        // ask for numbers and set flag to 1
        printf("Value 1: ");
        scanf("%d",&v1);
        printf("Value 2: ");
        scanf("%d",&v2);
        ctrl->value1 = v1;
		ctrl->value2 = v2;
		ctrl->flag = 1;
		printf("Would you like to continue? Yes(1) or No(-1) : ");
        scanf("%d",&choice);
		if (choice == -1)
		{
			ctrl->flag = -1;
		} else ctrl->flag=0;
		
    }


	//now detach the pointer from the shared memory
	shmdt(ctrl);
	//let us delete the shared memory
	shmctl(id,IPC_RMID,NULL);
	
	//job done
}