Golang 防止多个进程重复执行通过文件锁

func lock() {
	lockFile := "./lock.pid"
	lock, err := os.Open(lockFile)
	defer lock.Close()
	if err == nil {
		filePid, err := ioutil.ReadAll(lock)

		if err == nil {
			pidStr := fmt.Sprintf("%s", filePid)

			pid, _ := strconv.Atoi(pidStr)
			_, err := os.FindProcess(pid)
			if err == nil {
				fmt.Printf("[ERROR] 工具已启动[%s].", pidStr)
				os.Exit(1)
			}
		}
	}
	lock, err = os.Create(lockFile)
	if err != nil {
		log.Fatal("创建文件锁失败", err)
	}
	defer lock.Close()
	pid := fmt.Sprint(os.Getpid())
	lock.WriteString(pid)
}