#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include<stdio.h>
#define KEY1 (1492)
int main()
{

	int shmid;
	volatile int * addr;
	pid_t  pid1;
	
	shmid=shmget(KEY1,4*1,SHM_R|SHM_W);
	addr=shmat(shmid,0,4);
	addr=0;
	pid1=fork();
	if(pid1==0)
	{
		addr[0]=1;
		sleep(1);
		addr=2;
		sleep(1);
		addr=3;
	}
	else
	{	
		printf("addr is %i \n",addr);
		sleep(1);
		printf("addr is %i \n",addr);
		sleep(1);
		printf("addr is %i \n",addr);
		sleep(1);

		
		if((shmctl(shmid,IPC_RMID, 0)) < 0) 
		{
			printf("shmctl shared mem delete NG\n");
			exit(1);
		} 				
		printf("shmctl shared mem delete OK\n"); 
	}

	return 0;
}