1 | /* ADJ_FREQ Skew change test |
2 | * by: john stultz (johnstul@us.ibm.com) |
3 | * (C) Copyright IBM 2012 |
4 | * Licensed under the GPLv2 |
5 | * |
6 | * NOTE: This is a meta-test which cranks the ADJ_FREQ knob and |
7 | * then uses other tests to detect problems. Thus this test requires |
8 | * that the raw_skew, inconsistency-check and nanosleep tests be |
9 | * present in the same directory it is run from. |
10 | * |
11 | * To build: |
12 | * $ gcc change_skew.c -o change_skew -lrt |
13 | * |
14 | * This program is free software: you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation, either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * This program is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | */ |
24 | |
25 | |
26 | #include <stdio.h> |
27 | #include <stdlib.h> |
28 | #include <sys/time.h> |
29 | #include <sys/timex.h> |
30 | #include <time.h> |
31 | #include "../kselftest.h" |
32 | |
33 | #define NSEC_PER_SEC 1000000000LL |
34 | |
35 | |
36 | int change_skew_test(int ppm) |
37 | { |
38 | struct timex tx; |
39 | int ret; |
40 | |
41 | tx.modes = ADJ_FREQUENCY; |
42 | tx.freq = ppm << 16; |
43 | |
44 | ret = adjtimex(&tx); |
45 | if (ret < 0) { |
46 | printf("Error adjusting freq\n" ); |
47 | return ret; |
48 | } |
49 | |
50 | ret = system("./raw_skew" ); |
51 | ret |= system("./inconsistency-check" ); |
52 | ret |= system("./nanosleep" ); |
53 | |
54 | return ret; |
55 | } |
56 | |
57 | |
58 | int main(int argc, char **argv) |
59 | { |
60 | struct timex tx; |
61 | int i, ret; |
62 | |
63 | int ppm[5] = {0, 250, 500, -250, -500}; |
64 | |
65 | /* Kill ntpd */ |
66 | ret = system("killall -9 ntpd" ); |
67 | |
68 | /* Make sure there's no offset adjustment going on */ |
69 | tx.modes = ADJ_OFFSET; |
70 | tx.offset = 0; |
71 | ret = adjtimex(&tx); |
72 | |
73 | if (ret < 0) { |
74 | printf("Maybe you're not running as root?\n" ); |
75 | return -1; |
76 | } |
77 | |
78 | for (i = 0; i < 5; i++) { |
79 | printf("Using %i ppm adjustment\n" , ppm[i]); |
80 | ret = change_skew_test(ppm: ppm[i]); |
81 | if (ret) |
82 | break; |
83 | } |
84 | |
85 | /* Set things back */ |
86 | tx.modes = ADJ_FREQUENCY; |
87 | tx.offset = 0; |
88 | adjtimex(&tx); |
89 | |
90 | if (ret) { |
91 | printf("[FAIL]" ); |
92 | return ksft_exit_fail(); |
93 | } |
94 | printf("[OK]" ); |
95 | return ksft_exit_pass(); |
96 | } |
97 | |