gl/tests/test-sleep.c

   1 /* Test of sleep() function.
   2    Copyright (C) 2007-2012 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  18
  19 #include <config.h>
  20
  21 #include <unistd.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (sleep, unsigned int, (unsigned int));
  25
  26 #include <signal.h>
  27
  28 #include "macros.h"
  29
  30 #if HAVE_DECL_ALARM
  31 static void
  32 handle_alarm (int sig)
  33 {
  34   if (sig != SIGALRM)
  35     _exit (1);
  36 }
  37 #endif
  38
  39 int
  40 main (void)
  41 {
  42   ASSERT (sleep (1) <= 1);
  43
  44   ASSERT (sleep (0) == 0);
  45
  46 #if HAVE_DECL_ALARM
  47   {
  48     const unsigned int pentecost = 50 * 24 * 60 * 60; /* 50 days.  */
  49     unsigned int remaining;
  50     signal (SIGALRM, handle_alarm);
  51     alarm (1);
  52     remaining = sleep (pentecost);
  53     ASSERT (pentecost - 10 < remaining && remaining <= pentecost);
  54   }
  55 #endif
  56
  57   return 0;
  58 }