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- /* Checking macros for select functions.
- Copyright (C) 2011-2016 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
- #ifndef _SYS_SELECT_H
- # error "Never include <bits/select2.h> directly; use <sys/select.h> instead."
- #endif
- /* Helper functions to issue warnings and errors when needed. */
- extern long int __fdelt_chk (long int __d);
- extern long int __fdelt_warn (long int __d)
- __warnattr ("bit outside of fd_set selected");
- #undef __FD_ELT
- #define __FD_ELT(d) \
- __extension__ \
- ({ long int __d = (d); \
- (__builtin_constant_p (__d) \
- ? (0 <= __d && __d < __FD_SETSIZE \
- ? (__d / __NFDBITS) \
- : __fdelt_warn (__d)) \
- : __fdelt_chk (__d)); })
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