set-tai.c (1527B)
1/* Set tai offset 2 * by: John Stultz <john.stultz@linaro.org> 3 * (C) Copyright Linaro 2013 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_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 return ksft_exit_fail(); 65 } 66 } 67 printf("[OK]\n"); 68 return ksft_exit_pass(); 69}