time/tst-ftime.c

   1 /* Verify that ftime is sane.
   2    Copyright (C) 2014-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sys/timeb.h>
  20 #include <stdio.h>
  21
  22 static int
  23 do_test (void)
  24 {
  25   struct timeb prev, curr = {.time = 0, .millitm = 0};
  26   int sec = 0;
  27
  28   while (sec != 3)
  29     {
  30       prev = curr;
  31
  32       if (ftime (&curr))
  33         {
  34           printf ("ftime returned an error\n");
  35           return 1;
  36         }
  37
  38       if (curr.time < prev.time)
  39         {
  40           printf ("ftime's time flowed backwards\n");
  41           return 1;
  42         }
  43
  44       if (curr.time == prev.time
  45           && curr.millitm < prev.millitm)
  46         {
  47           printf ("ftime's millitm flowed backwards\n");
  48           return 1;
  49         }
  50
  51       if (curr.time > prev.time)
  52         sec ++;
  53     }
  54   return 0;
  55 }
  56
  57 #define TEST_FUNCTION do_test ()
  58 #include "../test-skeleton.c"