448 lines
12 KiB
C
448 lines
12 KiB
C
/* time.h -- An implementation of the standard Unix <sys/time.h> file.
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Written by Geoffrey Noer <noer@cygnus.com>
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Public domain; no rights reserved. */
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/*-
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. 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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)time.h 8.5 (Berkeley) 5/4/95
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* $FreeBSD$
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*/
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#ifndef _SYS_TIME_H_
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#define _SYS_TIME_H_
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#include <_ansi.h>
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#include <sys/cdefs.h>
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#include <sys/_timeval.h>
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#include <sys/types.h>
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#include <sys/timespec.h>
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/* Cygwin exposes sys/select.h to users of sys/time.h for a couple of years
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so we have to maintain that. Note that this is in accordance with POSIX. */
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#ifdef __CYGWIN__
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#include <sys/select.h>
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#endif /* __CYGWIN__ */
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struct timezone {
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int tz_minuteswest; /* minutes west of Greenwich */
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int tz_dsttime; /* type of dst correction */
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};
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#define DST_NONE 0 /* not on dst */
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#define DST_USA 1 /* USA style dst */
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#define DST_AUST 2 /* Australian style dst */
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#define DST_WET 3 /* Western European dst */
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#define DST_MET 4 /* Middle European dst */
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#define DST_EET 5 /* Eastern European dst */
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#define DST_CAN 6 /* Canada */
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#if __BSD_VISIBLE
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struct bintime {
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time_t sec;
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uint64_t frac;
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};
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static __inline void
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bintime_addx(struct bintime *_bt, uint64_t _x)
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{
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uint64_t _u;
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_u = _bt->frac;
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_bt->frac += _x;
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if (_u > _bt->frac)
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_bt->sec++;
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}
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static __inline void
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bintime_add(struct bintime *_bt, const struct bintime *_bt2)
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{
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uint64_t _u;
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_u = _bt->frac;
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_bt->frac += _bt2->frac;
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if (_u > _bt->frac)
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_bt->sec++;
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_bt->sec += _bt2->sec;
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}
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static __inline void
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bintime_sub(struct bintime *_bt, const struct bintime *_bt2)
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{
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uint64_t _u;
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_u = _bt->frac;
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_bt->frac -= _bt2->frac;
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if (_u < _bt->frac)
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_bt->sec--;
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_bt->sec -= _bt2->sec;
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}
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static __inline void
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bintime_mul(struct bintime *_bt, u_int _x)
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{
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uint64_t _p1, _p2;
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_p1 = (_bt->frac & 0xffffffffull) * _x;
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_p2 = (_bt->frac >> 32) * _x + (_p1 >> 32);
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_bt->sec *= _x;
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_bt->sec += (_p2 >> 32);
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_bt->frac = (_p2 << 32) | (_p1 & 0xffffffffull);
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}
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static __inline void
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bintime_shift(struct bintime *_bt, int _exp)
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{
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if (_exp > 0) {
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_bt->sec <<= _exp;
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_bt->sec |= _bt->frac >> (64 - _exp);
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_bt->frac <<= _exp;
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} else if (_exp < 0) {
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_bt->frac >>= -_exp;
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_bt->frac |= (uint64_t)_bt->sec << (64 + _exp);
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_bt->sec >>= -_exp;
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}
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}
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#define bintime_clear(a) ((a)->sec = (a)->frac = 0)
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#define bintime_isset(a) ((a)->sec || (a)->frac)
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#define bintime_cmp(a, b, cmp) \
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(((a)->sec == (b)->sec) ? \
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((a)->frac cmp (b)->frac) : \
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((a)->sec cmp (b)->sec))
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#define SBT_1S ((sbintime_t)1 << 32)
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#define SBT_1M (SBT_1S * 60)
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#define SBT_1MS (SBT_1S / 1000)
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#define SBT_1US (SBT_1S / 1000000)
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#define SBT_1NS (SBT_1S / 1000000000)
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#define SBT_MAX 0x7fffffffffffffffLL
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static __inline int
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sbintime_getsec(sbintime_t _sbt)
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{
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return (_sbt >> 32);
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}
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static __inline sbintime_t
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bttosbt(const struct bintime _bt)
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{
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return (((sbintime_t)_bt.sec << 32) + (_bt.frac >> 32));
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}
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static __inline struct bintime
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sbttobt(sbintime_t _sbt)
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{
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struct bintime _bt;
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_bt.sec = _sbt >> 32;
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_bt.frac = _sbt << 32;
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return (_bt);
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}
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/*-
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* Background information:
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*
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* When converting between timestamps on parallel timescales of differing
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* resolutions it is historical and scientific practice to round down rather
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* than doing 4/5 rounding.
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*
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* The date changes at midnight, not at noon.
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*
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* Even at 15:59:59.999999999 it's not four'o'clock.
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*
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* time_second ticks after N.999999999 not after N.4999999999
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*/
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static __inline void
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bintime2timespec(const struct bintime *_bt, struct timespec *_ts)
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{
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_ts->tv_sec = _bt->sec;
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_ts->tv_nsec = ((uint64_t)1000000000 *
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(uint32_t)(_bt->frac >> 32)) >> 32;
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}
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static __inline void
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timespec2bintime(const struct timespec *_ts, struct bintime *_bt)
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{
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_bt->sec = _ts->tv_sec;
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/* 18446744073 = int(2^64 / 1000000000) */
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_bt->frac = _ts->tv_nsec * (uint64_t)18446744073LL;
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}
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static __inline void
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bintime2timeval(const struct bintime *_bt, struct timeval *_tv)
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{
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_tv->tv_sec = _bt->sec;
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_tv->tv_usec = ((uint64_t)1000000 * (uint32_t)(_bt->frac >> 32)) >> 32;
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}
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static __inline void
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timeval2bintime(const struct timeval *_tv, struct bintime *_bt)
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{
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_bt->sec = _tv->tv_sec;
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/* 18446744073709 = int(2^64 / 1000000) */
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_bt->frac = _tv->tv_usec * (uint64_t)18446744073709LL;
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}
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static __inline struct timespec
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sbttots(sbintime_t _sbt)
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{
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struct timespec _ts;
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_ts.tv_sec = _sbt >> 32;
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_ts.tv_nsec = ((uint64_t)1000000000 * (uint32_t)_sbt) >> 32;
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return (_ts);
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}
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static __inline sbintime_t
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tstosbt(struct timespec _ts)
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{
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return (((sbintime_t)_ts.tv_sec << 32) +
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(_ts.tv_nsec * (((uint64_t)1 << 63) / 500000000) >> 32));
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}
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static __inline struct timeval
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sbttotv(sbintime_t _sbt)
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{
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struct timeval _tv;
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_tv.tv_sec = _sbt >> 32;
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_tv.tv_usec = ((uint64_t)1000000 * (uint32_t)_sbt) >> 32;
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return (_tv);
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}
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static __inline sbintime_t
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tvtosbt(struct timeval _tv)
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{
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return (((sbintime_t)_tv.tv_sec << 32) +
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(_tv.tv_usec * (((uint64_t)1 << 63) / 500000) >> 32));
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}
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#endif /* __BSD_VISIBLE */
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#ifdef _KERNEL
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/* Operations on timespecs */
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#define timespecclear(tvp) ((tvp)->tv_sec = (tvp)->tv_nsec = 0)
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#define timespecisset(tvp) ((tvp)->tv_sec || (tvp)->tv_nsec)
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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 timespecadd(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 >= 1000000000) { \
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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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#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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/* Operations on timevals. */
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#define timevalclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
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#define timevalisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
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#define timevalcmp(tvp, uvp, cmp) \
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(((tvp)->tv_sec == (uvp)->tv_sec) ? \
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((tvp)->tv_usec cmp (uvp)->tv_usec) : \
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((tvp)->tv_sec cmp (uvp)->tv_sec))
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/* timevaladd and timevalsub are not inlined */
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#endif /* _KERNEL */
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/*
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* Names of the interval timers, and structure
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* defining a timer setting.
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*/
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#define ITIMER_REAL 0
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#define ITIMER_VIRTUAL 1
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#define ITIMER_PROF 2
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struct itimerval {
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struct timeval it_interval; /* timer interval */
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struct timeval it_value; /* current value */
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};
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#ifdef _KERNEL
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/*
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* Kernel to clock driver interface.
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*/
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void inittodr(time_t base);
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void resettodr(void);
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extern volatile time_t time_second;
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extern volatile time_t time_uptime;
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extern struct bintime boottimebin;
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extern struct timeval boottime;
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extern struct bintime tc_tick_bt;
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extern sbintime_t tc_tick_sbt;
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extern struct bintime tick_bt;
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extern sbintime_t tick_sbt;
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extern int tc_precexp;
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extern int tc_timepercentage;
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extern struct bintime bt_timethreshold;
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extern struct bintime bt_tickthreshold;
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extern sbintime_t sbt_timethreshold;
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extern sbintime_t sbt_tickthreshold;
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/*
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* Functions for looking at our clock: [get]{bin,nano,micro}[up]time()
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*
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* Functions without the "get" prefix returns the best timestamp
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* we can produce in the given format.
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*
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* "bin" == struct bintime == seconds + 64 bit fraction of seconds.
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* "nano" == struct timespec == seconds + nanoseconds.
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* "micro" == struct timeval == seconds + microseconds.
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*
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* Functions containing "up" returns time relative to boot and
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* should be used for calculating time intervals.
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*
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* Functions without "up" returns UTC time.
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*
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* Functions with the "get" prefix returns a less precise result
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* much faster than the functions without "get" prefix and should
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* be used where a precision of 1/hz seconds is acceptable or where
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* performance is priority. (NB: "precision", _not_ "resolution" !)
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*/
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void binuptime(struct bintime *bt);
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void nanouptime(struct timespec *tsp);
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void microuptime(struct timeval *tvp);
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static __inline sbintime_t
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sbinuptime(void)
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{
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struct bintime _bt;
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binuptime(&_bt);
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return (bttosbt(_bt));
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}
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void bintime(struct bintime *bt);
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void nanotime(struct timespec *tsp);
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void microtime(struct timeval *tvp);
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void getbinuptime(struct bintime *bt);
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void getnanouptime(struct timespec *tsp);
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void getmicrouptime(struct timeval *tvp);
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static __inline sbintime_t
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getsbinuptime(void)
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{
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struct bintime _bt;
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getbinuptime(&_bt);
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return (bttosbt(_bt));
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}
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void getbintime(struct bintime *bt);
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void getnanotime(struct timespec *tsp);
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void getmicrotime(struct timeval *tvp);
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/* Other functions */
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int itimerdecr(struct itimerval *itp, int usec);
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int itimerfix(struct timeval *tv);
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int ppsratecheck(struct timeval *, int *, int);
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int ratecheck(struct timeval *, const struct timeval *);
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void timevaladd(struct timeval *t1, const struct timeval *t2);
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void timevalsub(struct timeval *t1, const struct timeval *t2);
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int tvtohz(struct timeval *tv);
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#define TC_DEFAULTPERC 5
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#define BT2FREQ(bt) \
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(((uint64_t)0x8000000000000000 + ((bt)->frac >> 2)) / \
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((bt)->frac >> 1))
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#define SBT2FREQ(sbt) ((SBT_1S + ((sbt) >> 1)) / (sbt))
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#define FREQ2BT(freq, bt) \
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{ \
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(bt)->sec = 0; \
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(bt)->frac = ((uint64_t)0x8000000000000000 / (freq)) << 1; \
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}
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#define TIMESEL(sbt, sbt2) \
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(((sbt2) >= sbt_timethreshold) ? \
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((*(sbt) = getsbinuptime()), 1) : ((*(sbt) = sbinuptime()), 0))
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#else /* !_KERNEL */
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#include <time.h>
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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int _EXFUN(setitimer, (int __which, const struct itimerval *__restrict __value,
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struct itimerval *__restrict __ovalue));
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int _EXFUN(utimes, (const char *__path, const struct timeval *__tvp));
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#if __BSD_VISIBLE
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int _EXFUN(adjtime, (const struct timeval *, struct timeval *));
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int _EXFUN(futimes, (int, const struct timeval *));
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int _EXFUN(futimesat, (int, const char *, const struct timeval [2]));
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int _EXFUN(lutimes, (const char *, const struct timeval *));
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int _EXFUN(settimeofday, (const struct timeval *, const struct timezone *));
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#endif
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#if __XSI_VISIBLE
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int _EXFUN(getitimer, (int __which, struct itimerval *__value));
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int _EXFUN(gettimeofday, (struct timeval *__restrict __p,
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void *__restrict __tz));
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#endif
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#ifdef _COMPILING_NEWLIB
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int _EXFUN(_gettimeofday, (struct timeval *__p, void *__tz));
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#endif
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__END_DECLS
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#endif /* !_KERNEL */
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#endif /* !_SYS_TIME_H_ */
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