mirror of https://gitee.com/openkylin/linux.git
97 lines
2.1 KiB
C
97 lines
2.1 KiB
C
/* ADJ_FREQ Skew change test
|
|
* by: john stultz (johnstul@us.ibm.com)
|
|
* (C) Copyright IBM 2012
|
|
* Licensed under the GPLv2
|
|
*
|
|
* NOTE: This is a meta-test which cranks the ADJ_FREQ knob and
|
|
* then uses other tests to detect problems. Thus this test requires
|
|
* that the raw_skew, inconsistency-check and nanosleep tests be
|
|
* present in the same directory it is run from.
|
|
*
|
|
* To build:
|
|
* $ gcc change_skew.c -o change_skew -lrt
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/time.h>
|
|
#include <sys/timex.h>
|
|
#include <time.h>
|
|
#include "../kselftest.h"
|
|
|
|
#define NSEC_PER_SEC 1000000000LL
|
|
|
|
|
|
int change_skew_test(int ppm)
|
|
{
|
|
struct timex tx;
|
|
int ret;
|
|
|
|
tx.modes = ADJ_FREQUENCY;
|
|
tx.freq = ppm << 16;
|
|
|
|
ret = adjtimex(&tx);
|
|
if (ret < 0) {
|
|
printf("Error adjusting freq\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = system("./raw_skew");
|
|
ret |= system("./inconsistency-check");
|
|
ret |= system("./nanosleep");
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
int main(int argv, char **argc)
|
|
{
|
|
struct timex tx;
|
|
int i, ret;
|
|
|
|
int ppm[5] = {0, 250, 500, -250, -500};
|
|
|
|
/* Kill ntpd */
|
|
ret = system("killall -9 ntpd");
|
|
|
|
/* Make sure there's no offset adjustment going on */
|
|
tx.modes = ADJ_OFFSET;
|
|
tx.offset = 0;
|
|
ret = adjtimex(&tx);
|
|
|
|
if (ret < 0) {
|
|
printf("Maybe you're not running as root?\n");
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < 5; i++) {
|
|
printf("Using %i ppm adjustment\n", ppm[i]);
|
|
ret = change_skew_test(ppm[i]);
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
/* Set things back */
|
|
tx.modes = ADJ_FREQUENCY;
|
|
tx.offset = 0;
|
|
adjtimex(&tx);
|
|
|
|
if (ret) {
|
|
printf("[FAIL]");
|
|
return ksft_exit_fail();
|
|
}
|
|
printf("[OK]");
|
|
return ksft_exit_pass();
|
|
}
|