111 lines · c
1/* Set tz value2 * by: John Stultz <john.stultz@linaro.org>3 * (C) Copyright Linaro 20164 * Licensed under the GPLv25 *6 * This program is free software: you can redistribute it and/or modify7 * it under the terms of the GNU General Public License as published by8 * the Free Software Foundation, either version 2 of the License, or9 * (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 of13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the14 * 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 ksft_exit_pass();106 107err:108 set_tz(min, dst);109 ksft_exit_fail();110}111