1. adb will recognize the shell protocol. so this xdbd version need use adb shell -x to debug for closing the recognize shell protocol. in future we will fix it 

```c struct xdbd_service_t { xdbd_pid_t pid; xdbd_event_t *read; xdbd_event_t *write; } xdbd_service_create(); // xdbd_service_fetch(); xdbd_service_destroy(); ```