goroutine for CPU Percentages

gistfile1.go

        go func(ws *websocket.Conn, ch chan bool) {
                var prev []string
                var vals []string
                for ;; {
                        f,e := os.Open("/proc/stat")
                        if e != nil {
                                return
                        }
                        defer f.Close()

                        r := bufio.NewReader(f)
                        line,_,e := r.ReadLine()
                        if e != nil {
                                return
                        }
                        vals = strings.Split(string(line), " ", -1)[2:6]

                        if prev != nil {
                                percent := (100 * (Sum(vals[:3]) - Sum(prev[:3]))/(Sum(vals) - Sum(prev)))
                                msg := fmt.Sprintf("%d", percent)
                                fmt.Println(string(msg))
                                ws.Write([]byte(msg))

                        }

                        prev = vals
                }
                ch <- true
        }(ws, ch)