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

   1 /* Test for timerfd related functions
   2    Copyright (C) 2021-2024 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 <errno.h>
  20 #include <intprops.h>
  21 #include <time.h>
  22 #include <support/check.h>
  23 #include <support/support.h>
  24 #include <support/xunistd.h>
  25 #include <support/timespec.h>
  26 #include <sys/time.h>
  27 #include <sys/timerfd.h>
  28
  29 static void
  30 timerfd_test (void)
  31 {
  32   struct itimerspec settings = { { 0, 0 }, { 2, 0 } };
  33   struct itimerspec val;
  34   int fd, ret;
  35
  36   fd = timerfd_create (CLOCK_REALTIME, 0);
  37   if (fd < 0)
  38     FAIL_EXIT1 ("*** timerfd_create failed: %m");
  39
  40   /* Set the timer.  */
  41   ret = timerfd_settime (fd, 0, &settings, NULL);
  42   if (ret != 0)
  43     FAIL_EXIT1 ("*** timerfd_settime failed: %m\n");
  44
  45   /* Sleep for 1 second.  */
  46   ret = usleep (1000000);
  47   if (ret != 0)
  48     FAIL_EXIT1 ("*** usleep failed: %m\n");
  49
  50   /* Read the timer just after sleep.  */
  51   ret = timerfd_gettime (fd, &val);
  52   if (ret != 0)
  53     FAIL_EXIT1 ("*** timerfd_gettime failed: %m\n");
  54
  55   /* Check difference between timerfd_gettime calls.  */
  56   TEST_COMPARE (support_timespec_check_in_range
  57                 ((struct timespec) { 1, 0 }, val.it_value, 0.9, 1.0), 1);
  58
  59   xclose (fd);
  60 }
  61
  62 static void
  63 timerfd_large_timeout (void)
  64 {
  65   int fd = timerfd_create (CLOCK_REALTIME, 0);
  66   TEST_VERIFY (fd != -1);
  67   support_create_timer (0, 100000000, false, NULL);
  68   struct itimerspec it = { { 0, 0 }, { TYPE_MAXIMUM (time_t), 0 } };
  69   int r = timerfd_settime (fd, 0, &it, NULL);
  70   if (r == 0)
  71     {
  72       uint64_t buf;
  73       TEST_COMPARE (read (fd, &buf, sizeof (buf)), -1);
  74       TEST_VERIFY (errno == EINTR);
  75     }
  76   else
  77     TEST_COMPARE (errno, EOVERFLOW);
  78 }
  79
  80 static int
  81 do_test (void)
  82 {
  83   timerfd_test ();
  84   timerfd_large_timeout ();
  85   return 0;
  86 }
  87
  88 #include <support/test-driver.c>