#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=1000;
	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;
}