sysdeps/unix/sysv/linux/tst-timerfd.c

   1 /* Test for timerfd related functions
   2    Copyright (C) 2021 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <time.h>
  20 #include <support/check.h>
  21 #include <support/xunistd.h>
  22 #include <support/timespec.h>
  23 #include <sys/time.h>
  24 #include <sys/timerfd.h>
  25
  26 static int
  27 do_test (void)
  28 {
  29   struct itimerspec settings = { { 2, 0 }, { 2, 0 } };
  30   struct itimerspec val1, val2;
  31   int fd, ret;
  32
  33   fd = timerfd_create (CLOCK_REALTIME, 0);
  34   if (fd < 0)
  35     FAIL_EXIT1 ("*** timerfd_create failed: %m");
  36
  37   /* Set the timer.  */
  38   ret = timerfd_settime (fd, 0, &settings, NULL);
  39   if (ret != 0)
  40     FAIL_EXIT1 ("*** timerfd_settime failed: %m\n");
  41
  42   /* Read the timer just before sleep.  */
  43   ret = timerfd_gettime (fd, &val1);
  44   if (ret != 0)
  45     FAIL_EXIT1 ("*** timerfd_gettime failed: %m\n");
  46
  47   /* Sleep for 1 second.  */
  48   ret = usleep (1000000);
  49   if (ret != 0)
  50     FAIL_EXIT1 ("*** usleep failed: %m\n");
  51
  52   /* Read the timer just after sleep.  */
  53   ret = timerfd_gettime (fd, &val2);
  54   if (ret != 0)
  55     FAIL_EXIT1 ("*** timerfd_gettime failed: %m\n");
  56
  57   /* Check difference between timerfd_gettime calls.  */
  58   struct timespec r = timespec_sub (val2.it_value, val1.it_value);
  59   TEST_COMPARE (support_timespec_check_in_range
  60                 ((struct timespec) { 1, 0 }, r, 1.0, 1.5), 0);
  61
  62   return 0;
  63 }
  64
  65 #include <support/test-driver.c>