debug/fdelt_chk.c

   1 /* Copyright (C) 2011-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stdio.h>
  19 #include <sys/select.h>
  20
  21
  22 long int
  23 __fdelt_chk (long int d)
  24 {
  25   if (d < 0 || d >= FD_SETSIZE)
  26     __fortify_fail ("bit out of range 0 - FD_SETSIZE on fd_set");
  27
  28   return d / __NFDBITS;
  29 }
  30 strong_alias (__fdelt_chk, __fdelt_warn)