/*
 Creating a shared memory segment and attaching it 
 to the logical address space.  sharedMem2.c++       
 Its logical address, size and removal     
*/
#include <iostream>
using namespace std;
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#define SIZE 4
#define MAXSIZE (2*4096) // 16KB

int main() {
	int shmID, *p;
        struct shmid_ds buff;

	shmID = shmget(ftok("/home/goutam", 1234), SIZE, 
                            IPC_CREAT | 0777);
	if(shmID == -1) {
          cerr << "Error in shmget";
          exit(1) ;
	}
	p = (int *) shmat(shmID, 0, 0777);
        cout << "Shared memory address: " 
             << (void *) p << "\n";
        p[0]=0; p[MAXSIZE]=MAXSIZE;
        cout << "data: " << p[0] << "-"
             << p[MAXSIZE] << "\n";
	shmdt(p) ;
        shmctl(shmID, IPC_RMID, &buff);
        
	return 0 ;
}