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)
      31  libc_hidden_def (__fdelt_chk)