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1/* Set tai offset2 * by: John Stultz <john.stultz@linaro.org>3 * (C) Copyright Linaro 20134 * 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_tai(int offset)29{30 struct timex tx;31 32 memset(&tx, 0, sizeof(tx));33 34 tx.modes = ADJ_TAI;35 tx.constant = offset;36 37 return adjtimex(&tx);38}39 40int get_tai(void)41{42 struct timex tx;43 44 memset(&tx, 0, sizeof(tx));45 46 adjtimex(&tx);47 return tx.tai;48}49 50int main(int argc, char **argv)51{52 int i, ret;53 54 ret = get_tai();55 printf("tai offset started at %i\n", ret);56 57 printf("Checking tai offsets can be properly set: ");58 fflush(stdout);59 for (i = 1; i <= 60; i++) {60 ret = set_tai(i);61 ret = get_tai();62 if (ret != i) {63 printf("[FAILED] expected: %i got %i\n", i, ret);64 ksft_exit_fail();65 }66 }67 printf("[OK]\n");68 ksft_exit_pass();69}70