319 lines
9.1 KiB
C
319 lines
9.1 KiB
C
/*
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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 <sys/_timeval.h>
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#include <sys/types.h>
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#include <sys/timespec.h>
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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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/*-
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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 * (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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#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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#ifndef _KERNEL /* NetBSD/OpenBSD compatible interfaces */
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#define timerclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
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#define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
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#define timercmp(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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#define timeradd(tvp, uvp, vvp) \
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do { \
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(vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \
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(vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
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if ((vvp)->tv_usec >= 1000000) { \
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(vvp)->tv_sec++; \
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(vvp)->tv_usec -= 1000000; \
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} \
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} while (0)
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#define timersub(tvp, uvp, vvp) \
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do { \
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(vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
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(vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
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if ((vvp)->tv_usec < 0) { \
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(vvp)->tv_sec--; \
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(vvp)->tv_usec += 1000000; \
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} \
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} while (0)
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#endif
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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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/*
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* Getkerninfo clock information structure
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*/
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struct clockinfo {
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int hz; /* clock frequency */
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int tick; /* micro-seconds per hz tick */
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int spare;
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int stathz; /* statistics clock frequency */
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int profhz; /* profiling clock frequency */
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};
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/* CLOCK_REALTIME and TIMER_ABSTIME are supposed to be in time.h */
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#ifndef CLOCK_REALTIME
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#define CLOCK_REALTIME 0
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#endif
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#define CLOCK_VIRTUAL 1
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#define CLOCK_PROF 2
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#define CLOCK_MONOTONIC 4
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#define TIMER_RELTIME 0x0 /* relative timer */
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#ifndef TIMER_ABSTIME
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#define TIMER_ABSTIME 0x1 /* absolute timer */
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#endif
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#ifdef _KERNEL
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extern time_t time_second;
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extern time_t time_uptime;
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extern struct timeval boottime;
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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 GMT 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 10 msec is acceptable or where
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* performance is priority. (NB: "precision", _not_ "resolution" !)
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*
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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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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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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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#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 adjtime(const struct timeval *, struct timeval *);
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int futimes(int, const struct timeval *);
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int getitimer(int, struct itimerval *);
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int gettimeofday(struct timeval *, struct timezone *);
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int lutimes(const char *, const struct timeval *);
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int setitimer(int, const struct itimerval *, struct itimerval *);
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int settimeofday(const struct timeval *, const struct timezone *);
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int utimes(const char *, const struct timeval *);
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__END_DECLS
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#endif /* !_KERNEL */
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#endif /* !_SYS_TIME_H_ */
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