1/* Checking macros for select functions.
 2   Copyright (C) 2011-2025 Free Software Foundation, Inc.
 3   This file is part of the GNU C Library.
 4
 5   The GNU C Library is free software; you can redistribute it and/or
 6   modify it under the terms of the GNU Lesser General Public
 7   License as published by the Free Software Foundation; either
 8   version 2.1 of the License, or (at your option) any later version.
 9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library; if not, see
17   <https://www.gnu.org/licenses/>.  */
18
19#ifndef _SYS_SELECT_H
20# error "Never include <bits/select2.h> directly; use <sys/select.h> instead."
21#endif
22
23#include <bits/select-decl.h>
24
25#undef __FD_ELT
26#define	__FD_ELT(d) \
27  __extension__								    \
28  ({ long int __d = (d);						    \
29     (__builtin_constant_p (__d)					    \
30      ? (0 <= __d && __d < __FD_SETSIZE					    \
31	 ? (__d / __NFDBITS)						    \
32	 : __fdelt_warn (__d))						    \
33      : __fdelt_chk (__d)); })