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
28 int 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
40 int 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
50 int 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
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.