package main

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

func main() {
    dstFile := "./bFile"
    serverAddr := "localhost:4040"
    server, err := net.Listen("tcp", serverAddr)
    CheckError(err)
    defer server.Close()
    recieveFile(server, dstFile)
}

func recieveFile(server net.Listener, dstFile string) {
    conn, err := server.Accept()
    CheckError(err)
    fo, err := os.Create(dstFile)
    CheckError(err)
    defer fo.Close()
    writenBytes, err := io.Copy(fo, conn)
    log.Printf("Saved %v bytes in file", writenBytes)
    CheckError(err)
}