2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
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15 * This product includes software developed by the University of
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33 * @(#)time.h 8.5 (Berkeley) 5/4/95
40 #include <sys/types.h>
41 #include <sys/timespec.h>
44 * Structure returned by gettimeofday(2) system call,
45 * and used in other calls.
48 long tv_sec; /* seconds */
49 long tv_usec; /* and microseconds */
53 int tz_minuteswest; /* minutes west of Greenwich */
54 int tz_dsttime; /* type of dst correction */
56 #define DST_NONE 0 /* not on dst */
57 #define DST_USA 1 /* USA style dst */
58 #define DST_AUST 2 /* Australian style dst */
59 #define DST_WET 3 /* Western European dst */
60 #define DST_MET 4 /* Middle European dst */
61 #define DST_EET 5 /* Eastern European dst */
62 #define DST_CAN 6 /* Canada */
71 bintime_addx(struct bintime *bt, uint64_t x)
82 bintime_add(struct bintime *bt, struct bintime *bt2)
87 bt->frac += bt2->frac;
94 bintime_sub(struct bintime *bt, struct bintime *bt2)
99 bt->frac -= bt2->frac;
106 * Background information:
108 * When converting between timestamps on parallel timescales of differing
109 * resolutions it is historical and scientific practice to round down rather
110 * than doing 4/5 rounding.
112 * The date changes at midnight, not at noon.
114 * Even at 15:59:59.999999999 it's not four'o'clock.
116 * time_second ticks after N.999999999 not after N.4999999999
120 bintime2timespec(struct bintime *bt, struct timespec *ts)
123 ts->tv_sec = bt->sec;
124 ts->tv_nsec = ((uint64_t)1000000000 * (uint32_t)(bt->frac >> 32)) >> 32;
128 timespec2bintime(struct timespec *ts, struct bintime *bt)
131 bt->sec = ts->tv_sec;
132 /* 18446744073 = int(2^64 / 1000000000) */
133 bt->frac = ts->tv_nsec * (uint64_t)18446744073LL;
137 bintime2timeval(struct bintime *bt, struct timeval *tv)
140 tv->tv_sec = bt->sec;
141 tv->tv_usec = ((uint64_t)1000000 * (uint32_t)(bt->frac >> 32)) >> 32;
145 timeval2bintime(struct timeval *tv, struct bintime *bt)
148 bt->sec = tv->tv_sec;
149 /* 18446744073709 = int(2^64 / 1000000) */
150 bt->frac = tv->tv_usec * (uint64_t)18446744073709LL;
152 #endif /* __BSD_VISIBLE */
156 /* Operations on timespecs */
157 #define timespecclear(tvp) ((tvp)->tv_sec = (tvp)->tv_nsec = 0)
158 #define timespecisset(tvp) ((tvp)->tv_sec || (tvp)->tv_nsec)
159 #define timespeccmp(tvp, uvp, cmp) \
160 (((tvp)->tv_sec == (uvp)->tv_sec) ? \
161 ((tvp)->tv_nsec cmp (uvp)->tv_nsec) : \
162 ((tvp)->tv_sec cmp (uvp)->tv_sec))
163 #define timespecadd(vvp, uvp) \
165 (vvp)->tv_sec += (uvp)->tv_sec; \
166 (vvp)->tv_nsec += (uvp)->tv_nsec; \
167 if ((vvp)->tv_nsec >= 1000000000) { \
169 (vvp)->tv_nsec -= 1000000000; \
172 #define timespecsub(vvp, uvp) \
174 (vvp)->tv_sec -= (uvp)->tv_sec; \
175 (vvp)->tv_nsec -= (uvp)->tv_nsec; \
176 if ((vvp)->tv_nsec < 0) { \
178 (vvp)->tv_nsec += 1000000000; \
182 /* Operations on timevals. */
184 #define timevalclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
185 #define timevalisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
186 #define timevalcmp(tvp, uvp, cmp) \
187 (((tvp)->tv_sec == (uvp)->tv_sec) ? \
188 ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
189 ((tvp)->tv_sec cmp (uvp)->tv_sec))
191 /* timevaladd and timevalsub are not inlined */
195 #ifndef _KERNEL /* NetBSD/OpenBSD compatible interfaces */
197 #define timerclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
198 #define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
199 #define timercmp(tvp, uvp, cmp) \
200 (((tvp)->tv_sec == (uvp)->tv_sec) ? \
201 ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
202 ((tvp)->tv_sec cmp (uvp)->tv_sec))
203 #define timeradd(tvp, uvp, vvp) \
205 (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \
206 (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
207 if ((vvp)->tv_usec >= 1000000) { \
209 (vvp)->tv_usec -= 1000000; \
212 #define timersub(tvp, uvp, vvp) \
214 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
215 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
216 if ((vvp)->tv_usec < 0) { \
218 (vvp)->tv_usec += 1000000; \
224 * Names of the interval timers, and structure
225 * defining a timer setting.
227 #define ITIMER_REAL 0
228 #define ITIMER_VIRTUAL 1
229 #define ITIMER_PROF 2
232 struct timeval it_interval; /* timer interval */
233 struct timeval it_value; /* current value */
237 * Getkerninfo clock information structure
240 int hz; /* clock frequency */
241 int tick; /* micro-seconds per hz tick */
243 int stathz; /* statistics clock frequency */
244 int profhz; /* profiling clock frequency */
247 /* CLOCK_REALTIME and TIMER_ABSTIME are supposed to be in time.h */
249 #ifndef CLOCK_REALTIME
250 #define CLOCK_REALTIME 0
252 #define CLOCK_VIRTUAL 1
255 #define TIMER_RELTIME 0x0 /* relative timer */
256 #ifndef TIMER_ABSTIME
257 #define TIMER_ABSTIME 0x1 /* absolute timer */
261 extern time_t time_second;
264 * Functions for looking at our clock: [get]{bin,nano,micro}[up]time()
266 * Functions without the "get" prefix returns the best timestamp
267 * we can produce in the given format.
269 * "bin" == struct bintime == seconds + 64 bit fraction of seconds.
270 * "nano" == struct timespec == seconds + nanoseconds.
271 * "micro" == struct timeval == seconds + microseconds.
273 * Functions containing "up" returns time relative to boot and
274 * should be used for calculating time intervals.
276 * Functions without "up" returns GMT time.
278 * Functions with the "get" prefix returns a less precise result
279 * much faster than the functions without "get" prefix and should
280 * be used where a precision of 10 msec is acceptable or where
281 * performance is priority. (NB: "precision", _not_ "resolution" !)
285 void binuptime(struct bintime *bt);
286 void nanouptime(struct timespec *tsp);
287 void microuptime(struct timeval *tvp);
289 void bintime(struct bintime *bt);
290 void nanotime(struct timespec *tsp);
291 void microtime(struct timeval *tvp);
293 void getbinuptime(struct bintime *bt);
294 void getnanouptime(struct timespec *tsp);
295 void getmicrouptime(struct timeval *tvp);
297 void getbintime(struct bintime *bt);
298 void getnanotime(struct timespec *tsp);
299 void getmicrotime(struct timeval *tvp);
301 /* Other functions */
302 int itimerdecr(struct itimerval *itp, int usec);
303 int itimerfix(struct timeval *tv);
304 void timevaladd(struct timeval *t1, struct timeval *t2);
305 void timevalsub(struct timeval *t1, struct timeval *t2);
306 int tvtohz(struct timeval *tv);
310 #include <sys/cdefs.h>
313 int adjtime(const struct timeval *, struct timeval *);
314 int futimes(int, const struct timeval *);
315 int getitimer(int, struct itimerval *);
316 int gettimeofday(struct timeval *, struct timezone *);
317 int lutimes(const char *, const struct timeval *);
318 int setitimer(int, const struct itimerval *, struct itimerval *);
319 int settimeofday(const struct timeval *, const struct timezone *);
320 int utimes(const char *, const struct timeval *);
323 #endif /* !_KERNEL */
325 #endif /* !_SYS_TIME_H_ */