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