79847968f9
away in the past from the current time. This should be plenty for the scheduler to do its job. It provides assurance that the timestamp returned is actually a valid one, not just some random garbage.
102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/*-
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* Copyright (c) 2016 Maksym Sobolyev <sobomax@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/time.h>
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#include <time.h>
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#include "uc_check_time.h"
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static const struct timeval max_diff_tv = {.tv_sec = 1, .tv_usec = 0};
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static const struct timespec max_diff_ts = {.tv_sec = 1, .tv_nsec = 0};
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#define timespeccmp(tvp, uvp, cmp) \
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(((tvp)->tv_sec == (uvp)->tv_sec) ? \
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((tvp)->tv_nsec cmp (uvp)->tv_nsec) : \
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((tvp)->tv_sec cmp (uvp)->tv_sec))
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#define timespecsub(vvp, uvp) \
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do { \
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(vvp)->tv_sec -= (uvp)->tv_sec; \
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(vvp)->tv_nsec -= (uvp)->tv_nsec; \
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if ((vvp)->tv_nsec < 0) { \
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(vvp)->tv_sec--; \
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(vvp)->tv_nsec += 1000000000; \
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} \
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} while (0)
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int
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uc_check_bintime(const struct bintime *mt)
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{
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struct timespec bt;
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bintime2timespec(mt, &bt);
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return (uc_check_timespec_real(&bt));
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}
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int
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uc_check_timeval(const struct timeval *bt)
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{
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struct timeval ct, dt;
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if (gettimeofday(&ct, NULL) < 0)
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return (-1);
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timersub(&ct, bt, &dt);
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if (!timercmp(&dt, &max_diff_tv, <))
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return (-1);
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return (0);
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}
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int
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uc_check_timespec_real(const struct timespec *bt)
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{
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struct timespec ct;
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if (clock_gettime(CLOCK_REALTIME, &ct) < 0)
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return (-1);
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timespecsub(&ct, bt);
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if (!timespeccmp(&ct, &max_diff_ts, <))
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return (-1);
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return (0);
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}
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int
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uc_check_timespec_mono(const struct timespec *bt)
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{
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struct timespec ct;
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if (clock_gettime(CLOCK_MONOTONIC, &ct) < 0)
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return (-1);
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timespecsub(&ct, bt);
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if (!timespeccmp(&ct, &max_diff_ts, <))
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return (-1);
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return (0);
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}
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