source: trunk/libs/newlib/src/newlib/libc/include/sys/time.h @ 444

/* time.h -- An implementation of the standard Unix <sys/time.h> file.
   Written by Geoffrey Noer <noer@cygnus.com>
   Public domain; no rights reserved. */

/*-
 * Copyright (c) 1982, 1986, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *      @(#)time.h      8.5 (Berkeley) 5/4/95
 * $FreeBSD$
 */

#ifndef _SYS_TIME_H_
#define _SYS_TIME_H_

#include <_ansi.h>
#include <sys/cdefs.h>
#include <sys/_timeval.h>
#include <sys/types.h>
#include <sys/timespec.h>

#if __BSD_VISIBLE || __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
#include <sys/select.h>
#endif

struct timezone {
        int     tz_minuteswest; /* minutes west of Greenwich */
        int     tz_dsttime;     /* type of dst correction */
};
#define DST_NONE        0       /* not on dst */
#define DST_USA         1       /* USA style dst */
#define DST_AUST        2       /* Australian style dst */
#define DST_WET         3       /* Western European dst */
#define DST_MET         4       /* Middle European dst */
#define DST_EET         5       /* Eastern European dst */
#define DST_CAN         6       /* Canada */

#if __BSD_VISIBLE
struct bintime {
        time_t  sec;
        uint64_t frac;
};

static __inline void
bintime_addx(struct bintime *_bt, uint64_t _x)
{
        uint64_t _u;

        _u = _bt->frac;
        _bt->frac += _x;
        if (_u > _bt->frac)
                _bt->sec++;
}

static __inline void
bintime_add(struct bintime *_bt, const struct bintime *_bt2)
{
        uint64_t _u;

        _u = _bt->frac;
        _bt->frac += _bt2->frac;
        if (_u > _bt->frac)
                _bt->sec++;
        _bt->sec += _bt2->sec;
}

static __inline void
bintime_sub(struct bintime *_bt, const struct bintime *_bt2)
{
        uint64_t _u;

        _u = _bt->frac;
        _bt->frac -= _bt2->frac;
        if (_u < _bt->frac)
                _bt->sec--;
        _bt->sec -= _bt2->sec;
}

static __inline void
bintime_mul(struct bintime *_bt, u_int _x)
{
        uint64_t _p1, _p2;

        _p1 = (_bt->frac & 0xffffffffull) * _x;
        _p2 = (_bt->frac >> 32) * _x + (_p1 >> 32);
        _bt->sec *= _x;
        _bt->sec += (_p2 >> 32);
        _bt->frac = (_p2 << 32) | (_p1 & 0xffffffffull);
}

static __inline void
bintime_shift(struct bintime *_bt, int _exp)
{

        if (_exp > 0) {
                _bt->sec <<= _exp;
                _bt->sec |= _bt->frac >> (64 - _exp);
                _bt->frac <<= _exp;
        } else if (_exp < 0) {
                _bt->frac >>= -_exp;
                _bt->frac |= (uint64_t)_bt->sec << (64 + _exp);
                _bt->sec >>= -_exp;
        }
}

#define bintime_clear(a)        ((a)->sec = (a)->frac = 0)
#define bintime_isset(a)        ((a)->sec || (a)->frac)
#define bintime_cmp(a, b, cmp)                                          \
        (((a)->sec == (b)->sec) ?                                       \
            ((a)->frac cmp (b)->frac) :                                 \
            ((a)->sec cmp (b)->sec))

#define SBT_1S  ((sbintime_t)1 << 32)
#define SBT_1M  (SBT_1S * 60)
#define SBT_1MS (SBT_1S / 1000)
#define SBT_1US (SBT_1S / 1000000)
#define SBT_1NS (SBT_1S / 1000000000)
#define SBT_MAX 0x7fffffffffffffffLL

static __inline int
sbintime_getsec(sbintime_t _sbt)
{

        return (_sbt >> 32);
}

static __inline sbintime_t
bttosbt(const struct bintime _bt)
{

        return (((sbintime_t)_bt.sec << 32) + (_bt.frac >> 32));
}

static __inline struct bintime
sbttobt(sbintime_t _sbt)
{
        struct bintime _bt;

        _bt.sec = _sbt >> 32;
        _bt.frac = _sbt << 32;
        return (_bt);
}

/*-
 * Background information:
 *
 * When converting between timestamps on parallel timescales of differing
 * resolutions it is historical and scientific practice to round down rather
 * than doing 4/5 rounding.
 *
 *   The date changes at midnight, not at noon.
 *
 *   Even at 15:59:59.999999999 it's not four'o'clock.
 *
 *   time_second ticks after N.999999999 not after N.4999999999
 */

static __inline void
bintime2timespec(const struct bintime *_bt, struct timespec *_ts)
{

        _ts->tv_sec = _bt->sec;
        _ts->tv_nsec = ((uint64_t)1000000000 *
            (uint32_t)(_bt->frac >> 32)) >> 32;
}

static __inline void
timespec2bintime(const struct timespec *_ts, struct bintime *_bt)
{

        _bt->sec = _ts->tv_sec;
        /* 18446744073 = int(2^64 / 1000000000) */
        _bt->frac = _ts->tv_nsec * (uint64_t)18446744073LL;
}

static __inline void
bintime2timeval(const struct bintime *_bt, struct timeval *_tv)
{

        _tv->tv_sec = _bt->sec;
        _tv->tv_usec = ((uint64_t)1000000 * (uint32_t)(_bt->frac >> 32)) >> 32;
}

static __inline void
timeval2bintime(const struct timeval *_tv, struct bintime *_bt)
{

        _bt->sec = _tv->tv_sec;
        /* 18446744073709 = int(2^64 / 1000000) */
        _bt->frac = _tv->tv_usec * (uint64_t)18446744073709LL;
}

static __inline struct timespec
sbttots(sbintime_t _sbt)
{
        struct timespec _ts;

        _ts.tv_sec = _sbt >> 32;
        _ts.tv_nsec = ((uint64_t)1000000000 * (uint32_t)_sbt) >> 32;
        return (_ts);
}

static __inline sbintime_t
tstosbt(struct timespec _ts)
{

        return (((sbintime_t)_ts.tv_sec << 32) +
            (_ts.tv_nsec * (((uint64_t)1 << 63) / 500000000) >> 32));
}

static __inline struct timeval
sbttotv(sbintime_t _sbt)
{
        struct timeval _tv;

        _tv.tv_sec = _sbt >> 32;
        _tv.tv_usec = ((uint64_t)1000000 * (uint32_t)_sbt) >> 32;
        return (_tv);
}

static __inline sbintime_t
tvtosbt(struct timeval _tv)
{

        return (((sbintime_t)_tv.tv_sec << 32) +
            (_tv.tv_usec * (((uint64_t)1 << 63) / 500000) >> 32));
}
#endif /* __BSD_VISIBLE */

/*
 * Names of the interval timers, and structure
 * defining a timer setting.
 */
#define ITIMER_REAL     0
#define ITIMER_VIRTUAL  1
#define ITIMER_PROF     2

struct itimerval {
        struct  timeval it_interval;    /* timer interval */
        struct  timeval it_value;       /* current value */
};

#ifndef _KERNEL
#include <time.h>

__BEGIN_DECLS
int utimes (const char *__path, const struct timeval *__tvp);

#if __BSD_VISIBLE
int adjtime (const struct timeval *, struct timeval *);
int futimes (int, const struct timeval *);
int lutimes (const char *, const struct timeval *);
int settimeofday (const struct timeval *, const struct timezone *);
#endif

#if __MISC_VISIBLE || __XSI_VISIBLE
int getitimer (int __which, struct itimerval *__value);
int setitimer (int __which, const struct itimerval *__restrict __value,
                                        struct itimerval *__restrict __ovalue);
#endif

int gettimeofday (struct timeval *__restrict __p,
                          void *__restrict __tz);

#if __GNU_VISIBLE
int futimesat (int, const char *, const struct timeval [2]);
#endif

#ifdef _COMPILING_NEWLIB
int _gettimeofday (struct timeval *__p, void *__tz);
#endif

__END_DECLS

#endif /* !_KERNEL */
#include <machine/_time.h>

#endif /* !_SYS_TIME_H_ */