120 lines
2.4 KiB
C
120 lines
2.4 KiB
C
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/* Set tz value
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* by: John Stultz <john.stultz@linaro.org>
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* (C) Copyright Linaro 2016
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* Licensed under the GPLv2
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <sys/time.h>
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#include <sys/timex.h>
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#include <string.h>
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#include <signal.h>
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#include <unistd.h>
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#ifdef KTEST
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#include "../kselftest.h"
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#else
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static inline int ksft_exit_pass(void)
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{
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exit(0);
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}
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static inline int ksft_exit_fail(void)
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{
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exit(1);
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}
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#endif
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int set_tz(int min, int dst)
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{
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struct timezone tz;
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tz.tz_minuteswest = min;
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tz.tz_dsttime = dst;
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return settimeofday(0, &tz);
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}
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int get_tz_min(void)
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{
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struct timezone tz;
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struct timeval tv;
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memset(&tz, 0, sizeof(tz));
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gettimeofday(&tv, &tz);
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return tz.tz_minuteswest;
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}
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int get_tz_dst(void)
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{
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struct timezone tz;
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struct timeval tv;
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memset(&tz, 0, sizeof(tz));
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gettimeofday(&tv, &tz);
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return tz.tz_dsttime;
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}
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int main(int argc, char **argv)
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{
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int i, ret;
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int min, dst;
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min = get_tz_min();
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dst = get_tz_dst();
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printf("tz_minuteswest started at %i, dst at %i\n", min, dst);
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printf("Checking tz_minuteswest can be properly set: ");
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for (i = -15*60; i < 15*60; i += 30) {
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ret = set_tz(i, dst);
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ret = get_tz_min();
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if (ret != i) {
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printf("[FAILED] expected: %i got %i\n", i, ret);
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goto err;
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}
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}
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printf("[OK]\n");
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printf("Checking invalid tz_minuteswest values are caught: ");
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if (!set_tz(-15*60-1, dst)) {
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printf("[FAILED] %i didn't return failure!\n", -15*60-1);
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goto err;
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}
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if (!set_tz(15*60+1, dst)) {
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printf("[FAILED] %i didn't return failure!\n", 15*60+1);
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goto err;
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}
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if (!set_tz(-24*60, dst)) {
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printf("[FAILED] %i didn't return failure!\n", -24*60);
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goto err;
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}
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if (!set_tz(24*60, dst)) {
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printf("[FAILED] %i didn't return failure!\n", 24*60);
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goto err;
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}
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printf("[OK]\n");
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set_tz(min, dst);
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return ksft_exit_pass();
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err:
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set_tz(min, dst);
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return ksft_exit_fail();
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}
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