c - Can not read utmpx file in go

Question

package main

import (
 "os"
 "fmt"
)

func main() {
  fd, err := os.Open("/var/run/utmpx")
  fmt.Println(fd, err)
  var data []byte
  len, err := fd.Read(data)
  fmt.Println(len, err)
}

&{0xc42000a240} nil

0 nil

There is no error, also no data.

This path /var/run/utmpx is read from system header file.

How to get this path is another question

system: macOS el capiton, go version go1.8 darwin/amd64

**My final goal is to read this file into go struct.**This file contains system users infomation.

Can I do that ? I will keep trying...

Answer 1

Waitting for answers