time/tst-adjtime.c

   1 /* Basic tests for adjtime.
   2    Copyright (C) 2020-2021 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 <sys/time.h>
  20 #include <stdlib.h>
  21
  22 #include <errno.h>
  23 #include <support/check.h>
  24
  25
  26 static int
  27 do_test (void)
  28 {
  29   /* Check if the interface allows getting the amount of time remaining
  30      from any previous adjustment that has not yet been completed.  This
  31      is a non-privileged function of adjtime.  */
  32   struct timeval tv;
  33   int r = adjtime (NULL, &tv);
  34   if (r == -1)
  35     {
  36       if (errno == ENOSYS)
  37         FAIL_UNSUPPORTED ("adjtime unsupported");
  38       FAIL_EXIT1 ("adjtime (NULL, ...) failed: %m");
  39     }
  40
  41   return 0;
  42 }
  43
  44 #include <support/test-driver.c>