Глобальные хоткеи в xcb

#include <xcb/xcb.h>
#include <xcb/xcb_keysyms.h>
#include <X11/keysym.h>
#include <stdio.h>
#include <stdlib.h>

int main(void)
{
  xcb_connection_t    *c;
  xcb_screen_t        *s;
  xcb_window_t         w;
  xcb_gcontext_t       g;
  xcb_generic_event_t *e;
  uint32_t             mask;
  uint32_t             values[2];
  int                  done = 0;
  xcb_rectangle_t      r = { 20, 20, 60, 60 };

  c = xcb_connect(NULL,NULL);
  if (xcb_connection_has_error(c)) {
    printf("Cannot open display\n");
    exit(1);
  }

  s = xcb_setup_roots_iterator( xcb_get_setup(c) ).data;

  g = xcb_generate_id(c);
  w = s->root;
  mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
  values[0] = s->black_pixel;
  values[1] = 0;
  xcb_create_gc(c, g, w, mask, values);

  w = xcb_generate_id(c);
  mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
  values[0] = s->white_pixel;
  values[1] = XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_KEY_PRESS;
  xcb_create_window(c, s->root_depth, w, s->root,
                    10, 10, 100, 100, 1,
                    XCB_WINDOW_CLASS_INPUT_OUTPUT, s->root_visual,
                    mask, values);

  xcb_map_window(c, w);
  xcb_flush(c);

  // HOTKEYS
  xcb_key_symbols_t* keySymbs = xcb_key_symbols_alloc(c);
  xcb_keycode_t* keyCode = xcb_key_symbols_get_keycode(keySymbs, XK_F12);
  xcb_void_cookie_t vc = xcb_grab_key(c, 1, s->root, XCB_MOD_MASK_CONTROL | XCB_MOD_MASK_SHIFT, *keyCode,
                                     XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC);
  
  while (!done && (e = xcb_wait_for_event(c))) {
    switch (e->response_type & ~0x80) {
    case XCB_EXPOSE:
      xcb_poly_fill_rectangle(c, w, g,  1, &r);
      xcb_flush(c);
      break;
    case XCB_KEY_PRESS:
      fprintf(stderr, "Key pressed");
      break;
    }
    free(e);
  }

  xcb_disconnect(c);

  return 0;
}