time/tst-clock_nanosleep.c

   1 /* Copyright (C) 2003-2023 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, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <stdio.h>
  20 #include <unistd.h>
  21 #include <sys/time.h>
  22 #include <time.h>
  23 #include <intprops.h>
  24 #include <support/support.h>
  25 #include <support/check.h>
  26
  27 /* Test that clock_nanosleep() does sleep.  */
  28 static void
  29 clock_nanosleep_test (void)
  30 {
  31   /* Current time.  */
  32   struct timeval tv1;
  33   gettimeofday (&tv1, NULL);
  34
  35   struct timespec ts = { 1, 0 };
  36   TEMP_FAILURE_RETRY (clock_nanosleep (CLOCK_REALTIME, 0, &ts, &ts));
  37
  38   /* At least one second must have passed.  */
  39   struct timeval tv2;
  40   gettimeofday (&tv2, NULL);
  41
  42   tv2.tv_sec -= tv1.tv_sec;
  43   tv2.tv_usec -= tv1.tv_usec;
  44   if (tv2.tv_usec < 0)
  45     --tv2.tv_sec;
  46
  47   TEST_VERIFY (tv2.tv_sec >= 1);
  48 }
  49
  50 static void
  51 clock_nanosleep_large_timeout (void)
  52 {
  53   support_create_timer (0, 100000000, false, NULL);
  54   struct timespec ts = { TYPE_MAXIMUM (time_t), 0 };
  55   int r = clock_nanosleep (CLOCK_REALTIME, 0, &ts, NULL);
  56   TEST_VERIFY (r == EINTR || r == EOVERFLOW);
  57 }
  58
  59 static int
  60 do_test (void)
  61 {
  62   clock_nanosleep_test ();
  63   clock_nanosleep_large_timeout ();
  64   return 0;
  65 }
  66
  67 #include <support/test-driver.c>