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}
70