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

   1 /* Test for clock_adjtime
   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 <time.h>
  20 #include <stdlib.h>
  21 #include <sys/time.h>
  22 #include <support/check.h>
  23 #include <support/timespec.h>
  24
  25 #ifndef ADJTIME_CALL
  26 # define ADJTIME_CALL(__clock, __timex) clock_adjtime (__clock, __timex)
  27 #endif
  28
  29 static int
  30 do_test (void)
  31 {
  32   struct timespec tv_then, tv_now;
  33   struct timex delta;
  34
  35   /* Check if altering target time is allowed.  */
  36   if (getenv (SETTIME_ENV_NAME) == NULL)
  37     FAIL_UNSUPPORTED ("clock_adjtime is executed only when "\
  38                       SETTIME_ENV_NAME" is set\n");
  39
  40   tv_then = xclock_now (CLOCK_REALTIME);
  41
  42   /* Setup time value to adjust - 1 sec. */
  43   delta.time.tv_sec = 1;
  44   delta.time.tv_usec = 0;
  45   delta.modes = ADJ_SETOFFSET;
  46
  47   int ret = ADJTIME_CALL (CLOCK_REALTIME, &delta);
  48   if (ret == -1)
  49     FAIL_EXIT1 ("clock_adjtime failed: %m\n");
  50
  51   tv_now = xclock_now (CLOCK_REALTIME);
  52
  53   /* Check if clock_adjtime adjusted the system time.  */
  54   struct timespec r = timespec_sub (tv_now, tv_then);
  55   TEST_COMPARE (support_timespec_check_in_range
  56                 ((struct timespec) { 1, 0 }, r, 0.9, 1.1), 1);
  57
  58   return 0;
  59 }
  60
  61 #include <support/test-driver.c>