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
ksft_exit_pass(void)34 static inline int ksft_exit_pass(void)
35 {
36 exit(0);
37 }
ksft_exit_fail(void)38 static inline int ksft_exit_fail(void)
39 {
40 exit(1);
41 }
42 #endif
43
44 #define NSEC_PER_SEC 1000000000LL
45
46
change_skew_test(int ppm)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
main(int argv,char ** argc)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 }
108