-#define __IN(fds, n) (fds->in + n)
-#define __OUT(fds, n) (fds->out + n)
-#define __EX(fds, n) (fds->ex + n)
-#define __RES_IN(fds, n) (fds->res_in + n)
-#define __RES_OUT(fds, n) (fds->res_out + n)
-#define __RES_EX(fds, n) (fds->res_ex + n)
-
-#define BITS(fds, n) (*__IN(fds, n)|*__OUT(fds, n)|*__EX(fds, n))
+#define BITS(fds, n) (*FDS_IN(fds, n)|*FDS_OUT(fds, n)|*FDS_EX(fds, n))