foo.c: In function ‘main’:
foo.c:26:18: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘int *’ [-Wformat=]
   26 |         printf("%d",&signal);
      |                 ~^  ~~~~~~~
      |                  |  |
      |                  |  int *
      |                  int
      |                 %ls