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        fflush(stdout);
  69        for (i = -15*60; i < 15*60; i += 30) {
  70                ret = set_tz(i, dst);
  71                ret = get_tz_min();
  72                if (ret != i) {
  73                        printf("[FAILED] expected: %i got %i\n", i, ret);
  74                        goto err;
  75                }
  76        }
  77        printf("[OK]\n");
  78
  79        printf("Checking invalid tz_minuteswest values are caught: ");
  80        fflush(stdout);
  81
  82        if (!set_tz(-15*60-1, dst)) {
  83                printf("[FAILED] %i didn't return failure!\n", -15*60-1);
  84                goto err;
  85        }
  86
  87        if (!set_tz(15*60+1, dst)) {
  88                printf("[FAILED] %i didn't return failure!\n", 15*60+1);
  89                goto err;
  90        }
  91
  92        if (!set_tz(-24*60, dst)) {
  93                printf("[FAILED] %i didn't return failure!\n", -24*60);
  94                goto err;
  95        }
  96
  97        if (!set_tz(24*60, dst)) {
  98                printf("[FAILED] %i didn't return failure!\n", 24*60);
  99                goto err;
 100        }
 101
 102        printf("[OK]\n");
 103
 104        set_tz(min, dst);
 105        return ksft_exit_pass();
 106
 107err:
 108        set_tz(min, dst);
 109        return ksft_exit_fail();
 110}
 111