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}