other

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

service

```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();
```