package main

import (
	"fmt"
	"io"
	"log"
	"os"
)

func main() {
	var buf [1048576]byte

	fd, err := os.Open("/dev/urandom")
	if err != nil {
		log.Fatal("Couldn't open urandom, " + err.Error())
	}
	count, err := io.ReadFull(fd, buf[:])
	if err != nil || count != len(buf) {
		log.Fatal("COuldn't read bytes, " + err.Error())
	}
	fd.Close()
	i := 0
	total := 0
	fd, err = os.Create("tmp.dat")
	for {
		i, err = fd.Write(buf[:])
		if err != nil || i != 1048576 {
			fmt.Printf("EOF at %dmb, %s\n", total, err.Error())
			fd.Close()
			os.Remove("tmp.dat")
			log.Fatal("End")
		}
		total++
	}
}