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| | /*
* Copyright 2022 Free Software Foundation, Inc.
* Written by Paul Eggert.
*
* 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 3 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <timespec.h>
#include <stdio.h>
int
main (void)
{
long int res = gettime_res ();
printf ("gettime_res returned %ld ns\n", res);
if (res <= 0)
{
fprintf (stderr, "gettime_res value %ld not positive\n", res);
return 1;
}
if (res < TIMESPEC_HZ)
{
if (TIMESPEC_HZ % res != 0)
{
fprintf (stderr,
("gettime_res value %ld ns is smaller than %d"
" but does not divide it\n"),
res, TIMESPEC_HZ);
return 1;
}
}
else
{
if (res % TIMESPEC_HZ != 0)
{
fprintf (stderr,
("gettime_res value %ld ns is larger than %d"
" but is not a multiple of it\n"),
res, TIMESPEC_HZ);
return 1;
}
}
int saw_res = 0;
for (int i = 0; i < 100000; i++)
{
struct timespec t = current_timespec ();
if (res < TIMESPEC_HZ
? t.tv_nsec % res != 0
: t.tv_nsec != 0 || t.tv_sec % (res / TIMESPEC_HZ) != 0)
{
fprintf (stderr,
("current_timespec returned %lld.%09ld which is not"
" a multiple of the resolution, %ld ns\n"),
(long long) t.tv_sec, t.tv_nsec, res);
return 1;
}
if (res < TIMESPEC_HZ
? (t.tv_nsec / res % 2 != 0
|| t.tv_nsec / res % 5 != 0)
: (t.tv_sec / (res / TIMESPEC_HZ) % 2 != 0
|| t.tv_sec / (res / TIMESPEC_HZ) % 5 != 0))
saw_res = 1;
}
if (saw_res == 0)
fprintf (stderr,
("warning: all timestamps had coarser"
" resolution than %ld ns\n"),
res);
return 0;
}
|