| /* 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)); }) |