misc/tst-fdset.c

   1 /* Test FD* macros.
   2    Copyright (C) 1997-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Robert Bihlmeyer <robbe@orcus.priv.at>.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <stdio.h>
  21 #include <sys/types.h>
  22
  23 int
  24 main (void)
  25 {
  26   int retval = 0;
  27   int i;
  28   fd_set set;
  29
  30   FD_ZERO (&set);
  31   for (i=0; i < FD_SETSIZE; ++i)
  32     {
  33       printf ("%d =>  check:", i);
  34       if (FD_ISSET (i, &set) == 0)
  35         fputs ("ok", stdout);
  36       else
  37         {
  38           fputs ("nok", stdout);
  39           retval = 1;
  40         }
  41       fputs (", set", stdout);
  42       FD_SET (i, &set);
  43       fputs (", check:", stdout);
  44       if (FD_ISSET (i, &set))
  45         fputs ("ok", stdout);
  46       else
  47         {
  48           fputs ("nok", stdout);
  49           retval = 1;
  50         }
  51       fputs (", clear", stdout);
  52       FD_CLR (i, &set);
  53       fputs (", check:", stdout);
  54       if (FD_ISSET (i, &set) == 0)
  55         puts ("ok");
  56       else
  57         {
  58           puts ("nok");
  59           retval = 1;
  60         }
  61     }
  62
  63   return retval;
  64 }