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

   1 /* Test for ntp_gettime.
   2    Copyright (C) 2021-2023 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 <stdlib.h>
  21 #include <sys/timex.h>
  22 #include <support/check.h>
  23 #include <support/xtime.h>
  24
  25 #ifndef NTP_GETTIME_SYSCALL
  26 # define NTP_GETTIME_SYSCALL ntp_gettime
  27 #endif
  28
  29 #define STR(__s) #__s
  30
  31 static int
  32 do_test (void)
  33 {
  34   struct timespec tv_before_ntp, tv_after_ntp;
  35   struct ntptimeval ntv;
  36
  37   /* To prevent seconds rollover (which is very unlikely though),
  38      loop until we do match seconds values before and after
  39      call to ntp_gettime.  */
  40   do
  41     {
  42       tv_before_ntp = xclock_now (CLOCK_REALTIME);
  43
  44       int ret = NTP_GETTIME_SYSCALL (&ntv);
  45       if (ret == -1)
  46         FAIL_EXIT1 (STR(NTP_GETTIME_SYSCALL)" failed: %m\n");
  47
  48       tv_after_ntp = xclock_now (CLOCK_REALTIME);
  49     }
  50   while (tv_after_ntp.tv_sec != tv_before_ntp.tv_sec);
  51
  52   TEST_COMPARE (tv_after_ntp.tv_sec, ntv.time.tv_sec);
  53   return 0;
  54 }
  55
  56 #include <support/test-driver.c>