信号

syscall.SIGHUP : 终端控制进程结束(终端连接断开)
syscall.SIGINT : 用户发送INTR字符(Ctrl+C)触发
syscall.SIGTERM : 结束程序(可以被捕获、阻塞或忽略) kill pid 出发

func WaitExitSingnal {
        ch := make(chan os.Signal, 1)
        signal.Notify(ch, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM)
        for {
            s := <-ch
            switch s {
            case syscall.SIGHUP:
                log.Info("收到终端断开信号, 忽略", "system")
            case syscall.SIGINT, syscall.SIGTERM:
                log.Info("应用准备退出", "system")
                self.GracefulStop()
                return
            }
        }
    }