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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2019 Linaro Limited. All rights reserved.
* Author: Rafael David Tinoco <rafael.tinoco@linaro.org>
*/
#include <errno.h>
#define TST_NO_DEFAULT_MAIN
#include "tst_test.h"
#include "tst_timer.h"
#include "tst_clocks.h"
#include "tst_wallclock.h"
#include "lapi/posix_clocks.h"
static struct timespec real_begin, mono_begin;
static int clock_saved;
void tst_wallclock_save(void)
{
/* save initial monotonic time to restore it when needed */
if (tst_clock_gettime(CLOCK_REALTIME, &real_begin))
tst_brk(TBROK | TERRNO, "tst_clock_gettime() realtime failed");
if (tst_clock_gettime(CLOCK_MONOTONIC_RAW, &mono_begin)) {
if (errno == EINVAL) {
tst_brk(TCONF | TERRNO,
"tst_clock_gettime() didn't support CLOCK_MONOTONIC_RAW");
}
tst_brk(TBROK | TERRNO, "tst_clock_gettime() monotonic failed");
}
clock_saved = 1;
}
void tst_wallclock_restore(void)
{
static struct timespec mono_end, elapsed, adjust;
if (!clock_saved)
return;
clock_saved = 0;
if (tst_clock_gettime(CLOCK_MONOTONIC_RAW, &mono_end))
tst_brk(TBROK | TERRNO, "tst_clock_gettime() monotonic failed");
elapsed = tst_timespec_diff(mono_end, mono_begin);
adjust = tst_timespec_add(real_begin, elapsed);
/* restore realtime clock based on monotonic delta */
if (tst_clock_settime(CLOCK_REALTIME, &adjust))
tst_brk(TBROK | TERRNO, "tst_clock_settime() realtime failed");
}
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