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96 lines
2.1 KiB
96 lines
2.1 KiB
/* ADJ_FREQ Skew change test |
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* by: john stultz ([email protected]) |
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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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