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d8694245 JS |
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 | #ifdef KTEST | |
32 | #include "../kselftest.h" | |
33 | #else | |
34 | static inline int ksft_exit_pass(void) | |
35 | { | |
36 | exit(0); | |
37 | } | |
38 | static inline int ksft_exit_fail(void) | |
39 | { | |
40 | exit(1); | |
41 | } | |
42 | #endif | |
43 | ||
44 | #define NSEC_PER_SEC 1000000000LL | |
45 | ||
46 | ||
47 | int change_skew_test(int ppm) | |
48 | { | |
49 | struct timex tx; | |
50 | int ret; | |
51 | ||
52 | tx.modes = ADJ_FREQUENCY; | |
53 | tx.freq = ppm << 16; | |
54 | ||
55 | ret = adjtimex(&tx); | |
56 | if (ret < 0) { | |
57 | printf("Error adjusting freq\n"); | |
58 | return ret; | |
59 | } | |
60 | ||
61 | ret = system("./raw_skew"); | |
62 | ret |= system("./inconsistency-check"); | |
63 | ret |= system("./nanosleep"); | |
64 | ||
65 | return ret; | |
66 | } | |
67 | ||
68 | ||
69 | int main(int argv, char **argc) | |
70 | { | |
71 | struct timex tx; | |
72 | int i, ret; | |
73 | ||
74 | int ppm[5] = {0, 250, 500, -250, -500}; | |
75 | ||
76 | /* Kill ntpd */ | |
77 | ret = system("killall -9 ntpd"); | |
78 | ||
79 | /* Make sure there's no offset adjustment going on */ | |
80 | tx.modes = ADJ_OFFSET; | |
81 | tx.offset = 0; | |
82 | ret = adjtimex(&tx); | |
83 | ||
84 | if (ret < 0) { | |
85 | printf("Maybe you're not running as root?\n"); | |
86 | return -1; | |
87 | } | |
88 | ||
89 | for (i = 0; i < 5; i++) { | |
90 | printf("Using %i ppm adjustment\n", ppm[i]); | |
91 | ret = change_skew_test(ppm[i]); | |
92 | if (ret) | |
93 | break; | |
94 | } | |
95 | ||
96 | /* Set things back */ | |
97 | tx.modes = ADJ_FREQUENCY; | |
98 | tx.offset = 0; | |
99 | adjtimex(&tx); | |
100 | ||
101 | if (ret) { | |
102 | printf("[FAIL]"); | |
103 | return ksft_exit_fail(); | |
104 | } | |
105 | printf("[OK]"); | |
106 | return ksft_exit_pass(); | |
107 | } |