mirror of https://gitee.com/openkylin/linux.git
80 lines
1.6 KiB
C
80 lines
1.6 KiB
C
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/* Set tai offset
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* by: John Stultz <john.stultz@linaro.org>
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* (C) Copyright Linaro 2013
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* Licensed under the GPLv2
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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 <time.h>
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#include <sys/time.h>
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#include <sys/timex.h>
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#include <string.h>
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#include <signal.h>
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#include <unistd.h>
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#ifdef KTEST
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#include "../kselftest.h"
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#else
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static inline int ksft_exit_pass(void)
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{
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exit(0);
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}
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static inline int ksft_exit_fail(void)
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{
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exit(1);
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}
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#endif
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int set_tai(int offset)
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{
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struct timex tx;
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memset(&tx, 0, sizeof(tx));
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tx.modes = ADJ_TAI;
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tx.constant = offset;
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return adjtimex(&tx);
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}
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int get_tai(void)
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{
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struct timex tx;
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memset(&tx, 0, sizeof(tx));
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adjtimex(&tx);
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return tx.tai;
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}
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int main(int argc, char **argv)
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{
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int i, ret;
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ret = get_tai();
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printf("tai offset started at %i\n", ret);
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printf("Checking tai offsets can be properly set: ");
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for (i = 1; i <= 60; i++) {
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ret = set_tai(i);
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ret = get_tai();
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if (ret != i) {
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printf("[FAILED] expected: %i got %i\n", i, ret);
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return ksft_exit_fail();
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}
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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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