LXR linux/tools/testing/selftests/timers/set-tz.c

   1/* Set tz value
   2 *              by: John Stultz <john.stultz@linaro.org>
   3 *              (C) Copyright Linaro 2016
   4 *              Licensed under the GPLv2
   5 *
   6 *   This program is free software: you can redistribute it and/or modify
   7 *   it under the terms of the GNU General Public License as published by
   8 *   the Free Software Foundation, either version 2 of the License, or
   9 *   (at your option) any later version.
  10 *
  11 *   This program is distributed in the hope that it will be useful,
  12 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *   GNU General Public License for more details.
  15 */
  16
  17
  18#include <stdio.h>
  19#include <stdlib.h>
  20#include <time.h>
  21#include <sys/time.h>
  22#include <sys/timex.h>
  23#include <string.h>
  24#include <signal.h>
  25#include <unistd.h>
  26#include "../kselftest.h"
  27
  28int set_tz(int min, int dst)
  29{
  30        struct timezone tz;
  31
  32        tz.tz_minuteswest = min;
  33        tz.tz_dsttime = dst;
  34
  35        return settimeofday(0, &tz);
  36}
  37
  38int get_tz_min(void)
  39{
  40        struct timezone tz;
  41        struct timeval tv;
  42
  43        memset(&tz, 0, sizeof(tz));
  44        gettimeofday(&tv, &tz);
  45        return tz.tz_minuteswest;
  46}
  47
  48int get_tz_dst(void)
  49{
  50        struct timezone tz;
  51        struct timeval tv;
  52
  53        memset(&tz, 0, sizeof(tz));
  54        gettimeofday(&tv, &tz);
  55        return tz.tz_dsttime;
  56}
  57
  58int main(int argc, char **argv)
  59{
  60        int i, ret;
  61        int min, dst;
  62
  63        min = get_tz_min();
  64        dst = get_tz_dst();
  65        printf("tz_minuteswest started at %i, dst at %i\n", min, dst);
  66
  67        printf("Checking tz_minuteswest can be properly set: ");
  68        for (i = -15*60; i < 15*60; i += 30) {
  69                ret = set_tz(i, dst);
  70                ret = get_tz_min();
  71                if (ret != i) {
  72                        printf("[FAILED] expected: %i got %i\n", i, ret);
  73                        goto err;
  74                }
  75        }
  76        printf("[OK]\n");
  77
  78        printf("Checking invalid tz_minuteswest values are caught: ");
  79
  80        if (!set_tz(-15*60-1, dst)) {
  81                printf("[FAILED] %i didn't return failure!\n", -15*60-1);
  82                goto err;
  83        }
  84
  85        if (!set_tz(15*60+1, dst)) {
  86                printf("[FAILED] %i didn't return failure!\n", 15*60+1);
  87                goto err;
  88        }
  89
  90        if (!set_tz(-24*60, dst)) {
  91                printf("[FAILED] %i didn't return failure!\n", -24*60);
  92                goto err;
  93        }
  94
  95        if (!set_tz(24*60, dst)) {
  96                printf("[FAILED] %i didn't return failure!\n", 24*60);
  97                goto err;
  98        }
  99
 100        printf("[OK]\n");
 101
 102        set_tz(min, dst);
 103        return ksft_exit_pass();
 104
 105err:
 106        set_tz(min, dst);
 107        return ksft_exit_fail();
 108}
 109