src/test/test-clock.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright (C) 2016 Canonical Ltd.
   4 ***/
   5
   6 #include <unistd.h>
   7 #include <fcntl.h>
   8
   9 #include "clock-util.h"
  10 #include "fd-util.h"
  11 #include "fileio.h"
  12 #include "log.h"
  13 #include "macro.h"
  14
  15 static void test_clock_is_localtime(void) {
  16         char adjtime[] = "/tmp/test-adjtime.XXXXXX";
  17         int fd = -1;
  18         _cleanup_fclose_ FILE* f = NULL;
  19
  20         static const struct scenario {
  21                 const char* contents;
  22                 int expected_result;
  23         } scenarios[] = {
  24                 /* adjtime configures UTC */
  25                 {"0.0 0 0\n0\nUTC\n", 0},
  26                 /* adjtime configures local time */
  27                 {"0.0 0 0\n0\nLOCAL\n", 1},
  28                 /* no final EOL */
  29                 {"0.0 0 0\n0\nUTC", 0},
  30                 {"0.0 0 0\n0\nLOCAL", 1},
  31                 /* empty value -> defaults to UTC */
  32                 {"0.0 0 0\n0\n", 0},
  33                 /* unknown value -> defaults to UTC */
  34                 {"0.0 0 0\n0\nFOO\n", 0},
  35                 /* no third line */
  36                 {"0.0 0 0", 0},
  37                 {"0.0 0 0\n", 0},
  38                 {"0.0 0 0\n0", 0},
  39         };
  40
  41         /* without an adjtime file we default to UTC */
  42         assert_se(clock_is_localtime("/nonexisting/adjtime") == 0);
  43
  44         fd = mkostemp_safe(adjtime);
  45         assert_se(fd >= 0);
  46         log_info("adjtime test file: %s", adjtime);
  47         f = fdopen(fd, "w");
  48         assert_se(f);
  49
  50         for (size_t i = 0; i < ELEMENTSOF(scenarios); ++i) {
  51                 log_info("scenario #%zu:, expected result %i", i, scenarios[i].expected_result);
  52                 log_info("%s", scenarios[i].contents);
  53                 rewind(f);
  54                 ftruncate(fd, 0);
  55                 assert_se(write_string_stream(f, scenarios[i].contents, WRITE_STRING_FILE_AVOID_NEWLINE) == 0);
  56                 assert_se(clock_is_localtime(adjtime) == scenarios[i].expected_result);
  57         }
  58
  59         unlink(adjtime);
  60 }
  61
  62 /* Test with the real /etc/adjtime */
  63 static void test_clock_is_localtime_system(void) {
  64         int r;
  65         r = clock_is_localtime(NULL);
  66
  67         if (access("/etc/adjtime", F_OK) == 0) {
  68                 log_info("/etc/adjtime exists, clock_is_localtime() == %i", r);
  69                 /* if /etc/adjtime exists we expect some answer, no error or
  70                  * crash */
  71                 assert_se(IN_SET(r, 0, 1));
  72         } else
  73                 /* default is UTC if there is no /etc/adjtime */
  74                 assert_se(r == 0);
  75 }
  76
  77 int main(int argc, char *argv[]) {
  78         test_clock_is_localtime();
  79         test_clock_is_localtime_system();
  80
  81         return 0;
  82 }