89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/*
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* Copyright 2022-2025 Free Software Foundation, Inc.
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* Written by Paul Eggert.
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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 3 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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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <timespec.h>
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#include <stdio.h>
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int
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main (void)
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{
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long int res = gettime_res ();
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printf ("gettime_res returned %ld ns\n", res);
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if (res <= 0)
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{
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fprintf (stderr, "gettime_res value %ld not positive\n", res);
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return 1;
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}
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if (res < TIMESPEC_HZ)
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{
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if (TIMESPEC_HZ % res != 0)
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{
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fprintf (stderr,
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("gettime_res value %ld ns is smaller than %d"
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" but does not divide it\n"),
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res, TIMESPEC_HZ);
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return 1;
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}
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}
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else
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{
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if (res % TIMESPEC_HZ != 0)
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{
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fprintf (stderr,
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("gettime_res value %ld ns is larger than %d"
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" but is not a multiple of it\n"),
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res, TIMESPEC_HZ);
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return 1;
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}
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}
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int saw_res = 0;
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for (int i = 0; i < 100000; i++)
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{
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struct timespec t = current_timespec ();
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if (res < TIMESPEC_HZ
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? t.tv_nsec % res != 0
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: t.tv_nsec != 0 || t.tv_sec % (res / TIMESPEC_HZ) != 0)
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{
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fprintf (stderr,
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("current_timespec returned %lld.%09ld which is not"
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" a multiple of the resolution, %ld ns\n"),
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(long long) t.tv_sec, t.tv_nsec, res);
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return 1;
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}
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if (res < TIMESPEC_HZ
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? (t.tv_nsec / res % 2 != 0
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|| t.tv_nsec / res % 5 != 0)
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: (t.tv_sec / (res / TIMESPEC_HZ) % 2 != 0
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|| t.tv_sec / (res / TIMESPEC_HZ) % 5 != 0))
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saw_res = 1;
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}
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if (saw_res == 0)
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fprintf (stderr,
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("warning: all timestamps had coarser"
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" resolution than %ld ns\n"),
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res);
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return 0;
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}
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