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 | return ksft_exit_fail(); |
65 | } |
66 | } |
67 | printf("[OK]\n" ); |
68 | return ksft_exit_pass(); |
69 | } |
70 | |