src/test/test-clock.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright (C) 2016 Canonical Ltd.
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <unistd.h>
  21 #include <fcntl.h>
  22
  23 #include "clock-util.h"
  24 #include "fd-util.h"
  25 #include "fileio.h"
  26 #include "log.h"
  27 #include "macro.h"
  28
  29 static void test_clock_is_localtime(void) {
  30         char adjtime[] = "/tmp/test-adjtime.XXXXXX";
  31         int fd = -1;
  32         _cleanup_fclose_ FILE* f = NULL;
  33
  34         static const struct scenario {
  35                 const char* contents;
  36                 int expected_result;
  37         } scenarios[] = {
  38                 /* adjtime configures UTC */
  39                 {"0.0 0 0\n0\nUTC\n", 0},
  40                 /* adjtime configures local time */
  41                 {"0.0 0 0\n0\nLOCAL\n", 1},
  42                 /* no final EOL */
  43                 {"0.0 0 0\n0\nUTC", 0},
  44                 {"0.0 0 0\n0\nLOCAL", 1},
  45                 /* empty value -> defaults to UTC */
  46                 {"0.0 0 0\n0\n", 0},
  47                 /* unknown value -> defaults to UTC */
  48                 {"0.0 0 0\n0\nFOO\n", 0},
  49                 /* no third line */
  50                 {"0.0 0 0", 0},
  51                 {"0.0 0 0\n", 0},
  52                 {"0.0 0 0\n0", 0},
  53         };
  54
  55         /* without an adjtime file we default to UTC */
  56         assert_se(clock_is_localtime("/nonexisting/adjtime") == 0);
  57
  58         fd = mkostemp_safe(adjtime);
  59         assert_se(fd >= 0);
  60         log_info("adjtime test file: %s", adjtime);
  61         f = fdopen(fd, "w");
  62         assert_se(f);
  63
  64         for (size_t i = 0; i < ELEMENTSOF(scenarios); ++i) {
  65                 log_info("scenario #%zu:, expected result %i", i, scenarios[i].expected_result);
  66                 log_info("%s", scenarios[i].contents);
  67                 rewind(f);
  68                 ftruncate(fd, 0);
  69                 assert_se(write_string_stream(f, scenarios[i].contents, false) == 0);
  70                 assert_se(clock_is_localtime(adjtime) == scenarios[i].expected_result);
  71         }
  72
  73         unlink(adjtime);
  74 }
  75
  76 /* Test with the real /etc/adjtime */
  77 static void test_clock_is_localtime_system(void) {
  78         int r;
  79         r = clock_is_localtime(NULL);
  80
  81         if (access("/etc/adjtime", F_OK) == 0) {
  82                 log_info("/etc/adjtime exists, clock_is_localtime() == %i", r);
  83                 /* if /etc/adjtime exists we expect some answer, no error or
  84                  * crash */
  85                 assert_se(r == 0 || r == 1);
  86         } else
  87                 /* default is UTC if there is no /etc/adjtime */
  88                 assert_se(r == 0);
  89 }
  90
  91 int main(int argc, char *argv[]) {
  92         test_clock_is_localtime();
  93         test_clock_is_localtime_system();
  94
  95         return 0;
  96 }