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: /usr/include/bits/

files >> /usr/include/bits/select2.h

 /* Checking macros for select functions.
   Copyright (C) 2011, 2012 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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