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77 lines
1.8 KiB
77 lines
1.8 KiB
/* ADJ_FREQ Skew consistency 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 back |
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* and forth and watches for consistency problems. Thus this test requires |
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* that the inconsistency-check tests be present in the same directory it |
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* is run from. |
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* |
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* To build: |
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* $ gcc skew_consistency.c -o skew_consistency -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 <unistd.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 <sys/types.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include <string.h> |
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#include <sys/wait.h> |
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#include "../kselftest.h" |
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#define NSEC_PER_SEC 1000000000LL |
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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 ret, ppm; |
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pid_t pid; |
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printf("Running Asynchronous Frequency Changing Tests...\n"); |
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pid = fork(); |
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if (!pid) |
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return system("./inconsistency-check -c 1 -t 600"); |
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ppm = 500; |
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ret = 0; |
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while (pid != waitpid(pid, &ret, WNOHANG)) { |
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ppm = -ppm; |
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tx.modes = ADJ_FREQUENCY; |
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tx.freq = ppm << 16; |
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adjtimex(&tx); |
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usleep(500000); |
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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("[FAILED]\n"); |
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return ksft_exit_fail(); |
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} |
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printf("[OK]\n"); |
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return ksft_exit_pass(); |
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}
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