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
34static inline int ksft_exit_pass(void)
35{
36	exit(0);
37}
38static inline int ksft_exit_fail(void)
39{
40	exit(1);
41}
42#endif
43
44#define NSEC_PER_SEC 1000000000LL
45
46
47int 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
69int 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