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