posix/tst-nanosleep.c

   1 /* Copyright (C) 2003 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <stdio.h>
  21 #include <unistd.h>
  22 #include <sys/time.h>
  23 #include <time.h>
  24
  25
  26 /* Test that nanosleep() does sleep.  */
  27 static int
  28 do_test (void)
  29 {
  30   /* Current time.  */
  31   struct timeval tv1;
  32   (void) gettimeofday (&tv1, NULL);
  33
  34   struct timespec ts;
  35   ts.tv_sec = 1;
  36   ts.tv_nsec = 0;
  37   TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
  38
  39   /* At least one second must have passed.  */
  40   struct timeval tv2;
  41   (void) gettimeofday (&tv2, NULL);
  42
  43   tv2.tv_sec -= tv1.tv_sec;
  44   tv2.tv_usec -= tv1.tv_usec;
  45   if (tv2.tv_usec < 0)
  46     --tv2.tv_sec;
  47
  48   if (tv2.tv_sec < 1)
  49     {
  50       puts ("nanosleep didn't sleep long enough");
  51       return 1;
  52     }
  53
  54   return 0;
  55 }
  56
  57 #define TEST_FUNCTION do_test ()
  58 #include "../test-skeleton.c"