package main

import (
	"fmt"
	"os"
	"syscall"
	"unsafe"
	)

func main() {
	n := 1000
	t := int(unsafe.Sizeof(0)) * n

	map_file, _ := os.Create("/tmp/test.dat")
	_, _ = map_file.Seek(int64(t - 1), 0)
	map_file.Write([]byte(" "))

	mmap, _ := syscall.Mmap(map_file.Fd(), 0, int(t), syscall.PROT_READ | syscall.PROT_WRITE, syscall.MAP_SHARED)
	map_array := (*[1000]int)(unsafe.Pointer(&mmap))

	for i:=0; i < n; i++ {
		map_array[i] = i*i
	}

	fmt.Println(*map_array)
}