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