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/* $NetBSD: time.h,v 1.11 2021/12/19 12:30:23 riastradh Exp $ */
/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Taylor R. Campbell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _LINUX_TIME_H_
#define _LINUX_TIME_H_
#include <sys/time.h>
#include <linux/math64.h>
#include <linux/seqlock.h>
#define timespec64 timespec /* take that, 2038 */
#define NSEC_PER_USEC 1000L
#define NSEC_PER_MSEC 1000000L
#define NSEC_PER_SEC 1000000000L
#define USEC_PER_MSEC 1000L
/*
* XXX get_seconds as implemented by Linux is a Y2038 bug waiting to
* happen on 32-bit systems because it returns unsigned long. Some
* callers in Linux (implicitly) convert the result to time_t, though.
* We'll pretend get_seconds returns time_t and make sure all our
* callers treat it as if it did.
*/
static inline time_t
get_seconds(void)
{
return time_second;
}
static inline void
getrawmonotonic(struct timespec *ts)
{
getnanouptime(ts);
}
static inline void
do_gettimeofday(struct timeval *tv)
{
microtime(tv);
}
static inline bool
timespec_valid(const struct timespec *ts)
{
if (ts->tv_sec < 0)
return false;
if (1000000000L <= ts->tv_nsec)
return false;
return true;
}
static inline struct timespec
ns_to_timespec(const int64_t nsec)
{
struct timespec ts;
ts.tv_sec = (nsec / 1000000000L);
ts.tv_nsec = (nsec % 1000000000L);
if (ts.tv_nsec < 0) {
ts.tv_sec -= 1;
ts.tv_nsec += 1000000000L;
}
return ts;
}
static inline int64_t
timespec_to_ns(const struct timespec *ts)
{
return (((int64_t)ts->tv_sec * 1000000000LL) + ts->tv_nsec);
}
static inline struct timeval
ns_to_timeval(int64_t nsec)
{
struct timespec ts;
struct timeval tv;
ts = ns_to_timespec(nsec);
TIMESPEC_TO_TIMEVAL(&tv, &ts);
return tv;
}
static inline int64_t
timeval_to_ns(const struct timeval *tv)
{
return (((int64_t)tv->tv_sec * 1000000000UL) + (tv->tv_usec * 1000ul));
}
static inline struct timespec
timespec_sub(struct timespec a, struct timespec b)
{
struct timespec d;
timespecsub(&a, &b, &d);
return d;
}
static inline void
set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec)
{
while (nsec >= 1000000000L) {
nsec -= 1000000000L;
sec += 1;
}
while (nsec < 0) {
nsec += 1000000000L;
sec -= 1;
}
ts->tv_sec = sec;
ts->tv_nsec = nsec;
}
static inline bool
time_after32(uint32_t a, uint32_t b)
{
return (int32_t)(b - a) < 0;
}
#endif /* _LINUX_TIME_H_ */
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