#include <iostream>
#include <cstring>
#include <cstdlib>
#include <cstdint>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#define SHM_KEY 1234
using namespace std;
void *attach_shared_memory(size_t& shm_bytes) {
	int shmid=shmget(SHM_KEY,1,0666);
	if (shmid==-1) {
		cout << "Attach memory failed " << endl;
		_exit(1);
	}
	void *base=shmat(shmid,NULL,0);
	return base;

}
int main(void) {
	size_t l=10000;
	size_t n=640;
	
	size_t shm_bytes=l*n*n*sizeof(uint8_t);
	void *base=attach_shared_memory(shm_bytes);
	uint8_t *a=(uint8_t *)base;
	for (int i=0;i<n;i++) {
		cout << (unsigned int) a[i] << " " ;
		}
		cout << endl;
		return 0;
}