| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame^] | 1 | /* Checking macros for select functions. |
| 2 | Copyright (C) 2011-2016 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 | <http://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 | /* Helper functions to issue warnings and errors when needed. */ |
| 24 | extern long int __fdelt_chk (long int __d); |
| 25 | extern long int __fdelt_warn (long int __d) |
| 26 | __warnattr ("bit outside of fd_set selected"); |
| 27 | #undef __FD_ELT |
| 28 | #define __FD_ELT(d) \ |
| 29 | __extension__ \ |
| 30 | ({ long int __d = (d); \ |
| 31 | (__builtin_constant_p (__d) \ |
| 32 | ? (0 <= __d && __d < __FD_SETSIZE \ |
| 33 | ? (__d / __NFDBITS) \ |
| 34 | : __fdelt_warn (__d)) \ |
| 35 | : __fdelt_chk (__d)); }) |