开启 xcb 事件循环

src/include/xcb.h

@@ -5,6 +5,7 @@
 #include <xcb/xproto.h>
 
 bool has_other_wm_running(void);
+int get_xcb_connection_fd(void);
 
 typedef struct monitor_rect_t monitor_rect_t;
 struct monitor_rect_t {
@@ -29,4 +30,5 @@ typedef struct window_list_t {
 } window_list_t;
 window_list_t *scan_window_list(void);
 void free_window_list(window_list_t *window_list);
+void start_xcb_event_loop(void);
 void clean_xcb(void);