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01: /* Checking macros for select functions.
02:    Copyright (C) 2011 Free Software Foundation, Inc.
03:    This file is part of the GNU C Library.
04: 
05:    The GNU C Library is free software; you can redistribute it and/or
06:    modify it under the terms of the GNU Lesser General Public
07:    License as published by the Free Software Foundation; either
08:    version 2.1 of the License, or (at your option) any later version.
09: 
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, write to the Free
17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18:    02111-1307 USA.  */
19: 
20: #ifndef _SYS_SELECT_H
21: # error "Never include <bits/select2.h> directly; use <sys/select.h> instead."
22: #endif
23: 
24: /* Helper functions to issue warnings and errors when needed.  */
25: extern unsigned long int __fdelt_chk (unsigned long int __d);
26: extern unsigned long int __fdelt_warn (unsigned long int __d)
27:   __warnattr ("bit outside of fd_set selected");
28: #undef __FD_ELT
29: #define __FD_ELT(d) \
30:   __extension__                                                             \
31:   ({ unsigned long int __d = (d);                                           \
32:      (__builtin_constant_p (__d)                                            \
33:       ? (__d >= __FD_SETSIZE                                                \
34:          ? __fdelt_warn (__d) : (__d / __NFDBITS))                          \
35:       : __fdelt_chk (__d)); })
36: 

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