tests/test-boot-time.c

   1 /* Test of getting the boot time.
   2    Copyright (C) 2023-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2023.  */
  18
  19 #include <config.h>
  20
  21 #include "boot-time.h"
  22
  23 #include <stddef.h>
  24 #include <stdio.h>
  25 #include <time.h>
  26
  27 #include "macros.h"
  28
  29 int
  30 main (int argc, char *argv[])
  31 {
  32   struct timespec boot_time;
  33   ASSERT (get_boot_time (&boot_time) == 0);
  34
  35   time_t tim = boot_time.tv_sec;
  36   struct tm *gmt = gmtime (&tim);
  37   ASSERT (gmt != NULL);
  38   char timbuf[100];
  39   ASSERT (strftime (timbuf, sizeof (timbuf), "%Y-%m-%d %H:%M:%S", gmt) > 0);
  40
  41   printf ("Boot time (UTC): %s.%09ld\n", timbuf, (long) boot_time.tv_nsec);
  42
  43   /* If the boot time is more than 5 years in the past or more than a week
  44      in the future, the value must be wrong.  */
  45   time_t now = time (NULL);
  46   ASSERT (tim >= now - 157680000);
  47   ASSERT (tim <= now + 604800);
  48
  49   return test_exit_status;
  50 }