time.h revision 96052
11541Srgrimes/* 21541Srgrimes * Copyright (c) 1982, 1986, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * Redistribution and use in source and binary forms, with or without 61541Srgrimes * modification, are permitted provided that the following conditions 71541Srgrimes * are met: 81541Srgrimes * 1. Redistributions of source code must retain the above copyright 91541Srgrimes * notice, this list of conditions and the following disclaimer. 101541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111541Srgrimes * notice, this list of conditions and the following disclaimer in the 121541Srgrimes * documentation and/or other materials provided with the distribution. 131541Srgrimes * 3. All advertising materials mentioning features or use of this software 141541Srgrimes * must display the following acknowledgement: 151541Srgrimes * This product includes software developed by the University of 161541Srgrimes * California, Berkeley and its contributors. 171541Srgrimes * 4. Neither the name of the University nor the names of its contributors 181541Srgrimes * may be used to endorse or promote products derived from this software 191541Srgrimes * without specific prior written permission. 201541Srgrimes * 211541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311541Srgrimes * SUCH DAMAGE. 321541Srgrimes * 3314487Shsu * @(#)time.h 8.5 (Berkeley) 5/4/95 3450477Speter * $FreeBSD: head/sys/sys/time.h 96052 2002-05-05 04:33:09Z bde $ 351541Srgrimes */ 361541Srgrimes 371541Srgrimes#ifndef _SYS_TIME_H_ 381541Srgrimes#define _SYS_TIME_H_ 391541Srgrimes 4014487Shsu#include <sys/types.h> 4114487Shsu 421541Srgrimes/* 431541Srgrimes * Structure returned by gettimeofday(2) system call, 441541Srgrimes * and used in other calls. 451541Srgrimes */ 461541Srgrimesstruct timeval { 471541Srgrimes long tv_sec; /* seconds */ 481541Srgrimes long tv_usec; /* and microseconds */ 491541Srgrimes}; 501541Srgrimes 5125775Speter#ifndef _TIMESPEC_DECLARED 5225775Speter#define _TIMESPEC_DECLARED 531541Srgrimesstruct timespec { 5418397Snate time_t tv_sec; /* seconds */ 5518397Snate long tv_nsec; /* and nanoseconds */ 561541Srgrimes}; 5725775Speter#endif 581541Srgrimes 5941827Sdes#define TIMEVAL_TO_TIMESPEC(tv, ts) \ 6041827Sdes do { \ 6141827Sdes (ts)->tv_sec = (tv)->tv_sec; \ 6241827Sdes (ts)->tv_nsec = (tv)->tv_usec * 1000; \ 6341827Sdes } while (0) 6441827Sdes#define TIMESPEC_TO_TIMEVAL(tv, ts) \ 6541827Sdes do { \ 6641827Sdes (tv)->tv_sec = (ts)->tv_sec; \ 6741827Sdes (tv)->tv_usec = (ts)->tv_nsec / 1000; \ 6841827Sdes } while (0) 691541Srgrimes 701541Srgrimesstruct timezone { 711541Srgrimes int tz_minuteswest; /* minutes west of Greenwich */ 721541Srgrimes int tz_dsttime; /* type of dst correction */ 731541Srgrimes}; 741541Srgrimes#define DST_NONE 0 /* not on dst */ 751541Srgrimes#define DST_USA 1 /* USA style dst */ 761541Srgrimes#define DST_AUST 2 /* Australian style dst */ 771541Srgrimes#define DST_WET 3 /* Western European dst */ 781541Srgrimes#define DST_MET 4 /* Middle European dst */ 791541Srgrimes#define DST_EET 5 /* Eastern European dst */ 801541Srgrimes#define DST_CAN 6 /* Canada */ 811541Srgrimes 8290362Sphkstruct bintime { 8395817Sphk time_t sec; 8495817Sphk uint64_t frac; 8590362Sphk}; 8690362Sphk 8790362Sphkstatic __inline void 8892769Sphkbintime_addx(struct bintime *bt, uint64_t x) 8990362Sphk{ 9092769Sphk uint64_t u; 9190362Sphk 9290362Sphk u = bt->frac; 9390362Sphk bt->frac += x; 9490362Sphk if (u > bt->frac) 9590362Sphk bt->sec++; 9690362Sphk} 9790362Sphk 9890362Sphkstatic __inline void 9990362Sphkbintime_add(struct bintime *bt, struct bintime *bt2) 10090362Sphk{ 10192769Sphk uint64_t u; 10290362Sphk 10390362Sphk u = bt->frac; 10490362Sphk bt->frac += bt2->frac; 10590362Sphk if (u > bt->frac) 10690362Sphk bt->sec++; 10790362Sphk bt->sec += bt2->sec; 10890362Sphk} 10990362Sphk 11090362Sphkstatic __inline void 11190362Sphkbintime_sub(struct bintime *bt, struct bintime *bt2) 11290362Sphk{ 11392769Sphk uint64_t u; 11490362Sphk 11590362Sphk u = bt->frac; 11690362Sphk bt->frac -= bt2->frac; 11790362Sphk if (u < bt->frac) 11890362Sphk bt->sec--; 11990362Sphk bt->sec -= bt2->sec; 12090362Sphk} 12190362Sphk 12292769Sphk/*- 12392769Sphk * Background information: 12492769Sphk * 12592769Sphk * When converting between timestamps on parallel timescales of differing 12692769Sphk * resolutions it is historical and scientific practice to round down rather 12792769Sphk * than doing 4/5 rounding. 12892769Sphk * 12992769Sphk * The date changes at midnight, not at noon. 13092769Sphk * 13192769Sphk * Even at 15:59:59.999999999 it's not four'o'clock. 13292769Sphk * 13392769Sphk * time_second ticks after N.999999999 not after N.4999999999 13492769Sphk */ 13592769Sphk 13690362Sphkstatic __inline void 13790362Sphkbintime2timespec(struct bintime *bt, struct timespec *ts) 13890362Sphk{ 13990362Sphk 14090362Sphk ts->tv_sec = bt->sec; 14195817Sphk ts->tv_nsec = ((uint64_t)1000000000 * (uint32_t)(bt->frac >> 32)) >> 32; 14290362Sphk} 14390362Sphk 14490362Sphkstatic __inline void 14590362Sphktimespec2bintime(struct timespec *ts, struct bintime *bt) 14690362Sphk{ 14790362Sphk 14890362Sphk bt->sec = ts->tv_sec; 14992769Sphk /* 18446744073 = int(2^64 / 1000000000) */ 15092769Sphk bt->frac = ts->tv_nsec * (uint64_t)18446744073LL; 15190362Sphk} 15290362Sphk 15390362Sphkstatic __inline void 15490362Sphkbintime2timeval(struct bintime *bt, struct timeval *tv) 15590362Sphk{ 15690362Sphk 15790362Sphk tv->tv_sec = bt->sec; 15895817Sphk tv->tv_usec = ((uint64_t)1000000 * (uint32_t)(bt->frac >> 32)) >> 32; 15990362Sphk} 16090362Sphk 16190362Sphkstatic __inline void 16290362Sphktimeval2bintime(struct timeval *tv, struct bintime *bt) 16390362Sphk{ 16490362Sphk 16590362Sphk bt->sec = tv->tv_sec; 16692769Sphk /* 18446744073709 = int(2^64 / 1000000) */ 16792769Sphk bt->frac = tv->tv_usec * (uint64_t)18446744073709LL; 16890362Sphk} 16990362Sphk 17055205Speter#ifdef _KERNEL 17135058Sphk 17235029Sphk/* Operations on timespecs */ 17335401Seivind#define timespecclear(tvp) ((tvp)->tv_sec = (tvp)->tv_nsec = 0) 17435029Sphk#define timespecisset(tvp) ((tvp)->tv_sec || (tvp)->tv_nsec) 17535029Sphk#define timespeccmp(tvp, uvp, cmp) \ 17635029Sphk (((tvp)->tv_sec == (uvp)->tv_sec) ? \ 17735029Sphk ((tvp)->tv_nsec cmp (uvp)->tv_nsec) : \ 17835029Sphk ((tvp)->tv_sec cmp (uvp)->tv_sec)) 17935058Sphk#define timespecadd(vvp, uvp) \ 18035029Sphk do { \ 18135058Sphk (vvp)->tv_sec += (uvp)->tv_sec; \ 18235058Sphk (vvp)->tv_nsec += (uvp)->tv_nsec; \ 18335029Sphk if ((vvp)->tv_nsec >= 1000000000) { \ 18435029Sphk (vvp)->tv_sec++; \ 18535029Sphk (vvp)->tv_nsec -= 1000000000; \ 18635029Sphk } \ 18735029Sphk } while (0) 18835058Sphk#define timespecsub(vvp, uvp) \ 18935029Sphk do { \ 19035058Sphk (vvp)->tv_sec -= (uvp)->tv_sec; \ 19135058Sphk (vvp)->tv_nsec -= (uvp)->tv_nsec; \ 19235029Sphk if ((vvp)->tv_nsec < 0) { \ 19335029Sphk (vvp)->tv_sec--; \ 19435029Sphk (vvp)->tv_nsec += 1000000000; \ 19535029Sphk } \ 19635029Sphk } while (0) 19735058Sphk 1981541Srgrimes/* Operations on timevals. */ 19935058Sphk 20074574Smarkm#define timevalclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0) 20135058Sphk#define timevalisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec) 20235029Sphk#define timevalcmp(tvp, uvp, cmp) \ 20335029Sphk (((tvp)->tv_sec == (uvp)->tv_sec) ? \ 20435029Sphk ((tvp)->tv_usec cmp (uvp)->tv_usec) : \ 20535029Sphk ((tvp)->tv_sec cmp (uvp)->tv_sec)) 20635058Sphk 20735058Sphk/* timevaladd and timevalsub are not inlined */ 20835058Sphk 20955205Speter#endif /* _KERNEL */ 21035029Sphk 21172093Sasmodai#ifndef _KERNEL /* NetBSD/OpenBSD compatible interfaces */ 21235058Sphk 21374574Smarkm#define timerclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0) 2141541Srgrimes#define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec) 21535058Sphk#define timercmp(tvp, uvp, cmp) \ 2161541Srgrimes (((tvp)->tv_sec == (uvp)->tv_sec) ? \ 2171541Srgrimes ((tvp)->tv_usec cmp (uvp)->tv_usec) : \ 2181541Srgrimes ((tvp)->tv_sec cmp (uvp)->tv_sec)) 21921099Speter#define timeradd(tvp, uvp, vvp) \ 22021099Speter do { \ 22121099Speter (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \ 22221099Speter (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \ 22321099Speter if ((vvp)->tv_usec >= 1000000) { \ 22421099Speter (vvp)->tv_sec++; \ 22521099Speter (vvp)->tv_usec -= 1000000; \ 22621099Speter } \ 22721099Speter } while (0) 22821099Speter#define timersub(tvp, uvp, vvp) \ 22921099Speter do { \ 23021099Speter (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \ 23121099Speter (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \ 23221099Speter if ((vvp)->tv_usec < 0) { \ 23321099Speter (vvp)->tv_sec--; \ 23421099Speter (vvp)->tv_usec += 1000000; \ 23521099Speter } \ 23621099Speter } while (0) 23721099Speter#endif 2381541Srgrimes 2391541Srgrimes/* 2401541Srgrimes * Names of the interval timers, and structure 2411541Srgrimes * defining a timer setting. 2421541Srgrimes */ 2431541Srgrimes#define ITIMER_REAL 0 2441541Srgrimes#define ITIMER_VIRTUAL 1 2451541Srgrimes#define ITIMER_PROF 2 2461541Srgrimes 24783045Sobrienstruct itimerval { 2481541Srgrimes struct timeval it_interval; /* timer interval */ 2491541Srgrimes struct timeval it_value; /* current value */ 2501541Srgrimes}; 2511541Srgrimes 2521541Srgrimes/* 2531541Srgrimes * Getkerninfo clock information structure 2541541Srgrimes */ 2551541Srgrimesstruct clockinfo { 2561541Srgrimes int hz; /* clock frequency */ 2571541Srgrimes int tick; /* micro-seconds per hz tick */ 25896052Sbde int spare; 2591541Srgrimes int stathz; /* statistics clock frequency */ 2601541Srgrimes int profhz; /* profiling clock frequency */ 2611541Srgrimes}; 2621541Srgrimes 26334030Sdufault/* CLOCK_REALTIME and TIMER_ABSTIME are supposed to be in time.h */ 26434030Sdufault 26534030Sdufault#ifndef CLOCK_REALTIME 26625578Speter#define CLOCK_REALTIME 0 26734030Sdufault#endif 26825578Speter#define CLOCK_VIRTUAL 1 26925578Speter#define CLOCK_PROF 2 27025578Speter 27125578Speter#define TIMER_RELTIME 0x0 /* relative timer */ 27234030Sdufault#ifndef TIMER_ABSTIME 27325578Speter#define TIMER_ABSTIME 0x1 /* absolute timer */ 27434030Sdufault#endif 27525578Speter 27655205Speter#ifdef _KERNEL 27734961Sphkextern time_t time_second; 27833690Sphk 27995817Sphk/* 28095491Sphk * Functions for looking at our clock: [get]{bin,nano,micro}[up]time() 28195491Sphk * 28295491Sphk * Functions without the "get" prefix returns the best timestamp 28395491Sphk * we can produce in the given format. 28495491Sphk * 28595491Sphk * "bin" == struct bintime == seconds + 64 bit fraction of seconds. 28695491Sphk * "nano" == struct timespec == seconds + nanoseconds. 28795491Sphk * "micro" == struct timeval == seconds + microseconds. 28895491Sphk * 28995491Sphk * Functions containing "up" returns time relative to boot and 29095491Sphk * should be used for calculating time intervals. 29195491Sphk * 29295491Sphk * Functions without "up" returns GMT time. 29395491Sphk * 29495491Sphk * Functions with the "get" prefix returns a less precise result 29595491Sphk * much faster than the functions without "get" prefix and should 29695491Sphk * be used where a precision of 10 msec is acceptable or where 29795491Sphk * performance is priority. (NB: "precision", _not_ "resolution" !) 29895491Sphk * 29995491Sphk */ 30095491Sphk 30190362Sphkvoid binuptime(struct bintime *bt); 30295817Sphkvoid nanouptime(struct timespec *tsp); 30395817Sphkvoid microuptime(struct timeval *tvp); 30495491Sphk 30590362Sphkvoid bintime(struct bintime *bt); 30695817Sphkvoid nanotime(struct timespec *tsp); 30795817Sphkvoid microtime(struct timeval *tvp); 30895491Sphk 30995491Sphkvoid getbinuptime(struct bintime *bt); 31095491Sphkvoid getnanouptime(struct timespec *tsp); 31195817Sphkvoid getmicrouptime(struct timeval *tvp); 31295491Sphk 31395491Sphkvoid getbintime(struct bintime *bt); 31495491Sphkvoid getnanotime(struct timespec *tsp); 31595817Sphkvoid getmicrotime(struct timeval *tvp); 31695491Sphk 31795817Sphk/* Other functions */ 31892719Salfredint itimerdecr(struct itimerval *itp, int usec); 31992719Salfredint itimerfix(struct timeval *tv); 32095817Sphkvoid timevaladd(struct timeval *t1, struct timeval *t2); 32195817Sphkvoid timevalsub(struct timeval *t1, struct timeval *t2); 32295817Sphkint tvtohz(struct timeval *tv); 32355205Speter#else /* !_KERNEL */ 3241541Srgrimes#include <time.h> 3251541Srgrimes 3261541Srgrimes#include <sys/cdefs.h> 3271541Srgrimes 3281541Srgrimes__BEGIN_DECLS 32992719Salfredint adjtime(const struct timeval *, struct timeval *); 33092719Salfredint futimes(int, const struct timeval *); 33192719Salfredint getitimer(int, struct itimerval *); 33292719Salfredint gettimeofday(struct timeval *, struct timezone *); 33392719Salfredint lutimes(const char *, const struct timeval *); 33492719Salfredint setitimer(int, const struct itimerval *, struct itimerval *); 33592719Salfredint settimeofday(const struct timeval *, const struct timezone *); 33692719Salfredint utimes(const char *, const struct timeval *); 3371541Srgrimes__END_DECLS 3381541Srgrimes 33955205Speter#endif /* !_KERNEL */ 3401541Srgrimes 3411541Srgrimes#endif /* !_SYS_TIME_H_ */ 342