1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)time.h 8.5 (Berkeley) 5/4/95
32 * $FreeBSD: stable/12/sys/sys/time.h 372421 2022-08-20 02:27:37Z asomers $
33 */
34
35 #ifndef _SYS_TIME_H_
36 #define _SYS_TIME_H_
37
38 #include <sys/_timeval.h>
39 #include <sys/types.h>
40 #include <sys/timespec.h>
41
42 struct timezone {
43 int tz_minuteswest; /* minutes west of Greenwich */
44 int tz_dsttime; /* type of dst correction */
45 };
46 #define DST_NONE 0 /* not on dst */
47 #define DST_USA 1 /* USA style dst */
48 #define DST_AUST 2 /* Australian style dst */
49 #define DST_WET 3 /* Western European dst */
50 #define DST_MET 4 /* Middle European dst */
51 #define DST_EET 5 /* Eastern European dst */
52 #define DST_CAN 6 /* Canada */
53
54 #if __BSD_VISIBLE
55 struct bintime {
56 time_t sec;
57 uint64_t frac;
58 };
59
60 static __inline void
bintime_addx(struct bintime * _bt,uint64_t _x)61 bintime_addx(struct bintime *_bt, uint64_t _x)
62 {
63 uint64_t _u;
64
65 _u = _bt->frac;
66 _bt->frac += _x;
67 if (_u > _bt->frac)
68 _bt->sec++;
69 }
70
71 static __inline void
bintime_add(struct bintime * _bt,const struct bintime * _bt2)72 bintime_add(struct bintime *_bt, const struct bintime *_bt2)
73 {
74 uint64_t _u;
75
76 _u = _bt->frac;
77 _bt->frac += _bt2->frac;
78 if (_u > _bt->frac)
79 _bt->sec++;
80 _bt->sec += _bt2->sec;
81 }
82
83 static __inline void
bintime_sub(struct bintime * _bt,const struct bintime * _bt2)84 bintime_sub(struct bintime *_bt, const struct bintime *_bt2)
85 {
86 uint64_t _u;
87
88 _u = _bt->frac;
89 _bt->frac -= _bt2->frac;
90 if (_u < _bt->frac)
91 _bt->sec--;
92 _bt->sec -= _bt2->sec;
93 }
94
95 static __inline void
bintime_mul(struct bintime * _bt,u_int _x)96 bintime_mul(struct bintime *_bt, u_int _x)
97 {
98 uint64_t _p1, _p2;
99
100 _p1 = (_bt->frac & 0xffffffffull) * _x;
101 _p2 = (_bt->frac >> 32) * _x + (_p1 >> 32);
102 _bt->sec *= _x;
103 _bt->sec += (_p2 >> 32);
104 _bt->frac = (_p2 << 32) | (_p1 & 0xffffffffull);
105 }
106
107 static __inline void
bintime_shift(struct bintime * _bt,int _exp)108 bintime_shift(struct bintime *_bt, int _exp)
109 {
110
111 if (_exp > 0) {
112 _bt->sec <<= _exp;
113 _bt->sec |= _bt->frac >> (64 - _exp);
114 _bt->frac <<= _exp;
115 } else if (_exp < 0) {
116 _bt->frac >>= -_exp;
117 _bt->frac |= (uint64_t)_bt->sec << (64 + _exp);
118 _bt->sec >>= -_exp;
119 }
120 }
121
122 #define bintime_clear(a) ((a)->sec = (a)->frac = 0)
123 #define bintime_isset(a) ((a)->sec || (a)->frac)
124 #define bintime_cmp(a, b, cmp) \
125 (((a)->sec == (b)->sec) ? \
126 ((a)->frac cmp (b)->frac) : \
127 ((a)->sec cmp (b)->sec))
128
129 #define SBT_1S ((sbintime_t)1 << 32)
130 #define SBT_1M (SBT_1S * 60)
131 #define SBT_1MS (SBT_1S / 1000)
132 #define SBT_1US (SBT_1S / 1000000)
133 #define SBT_1NS (SBT_1S / 1000000000) /* beware rounding, see nstosbt() */
134 #define SBT_MAX 0x7fffffffffffffffLL
135
136 static __inline int
sbintime_getsec(sbintime_t _sbt)137 sbintime_getsec(sbintime_t _sbt)
138 {
139
140 return (_sbt >> 32);
141 }
142
143 static __inline sbintime_t
bttosbt(const struct bintime _bt)144 bttosbt(const struct bintime _bt)
145 {
146
147 return (((sbintime_t)_bt.sec << 32) + (_bt.frac >> 32));
148 }
149
150 static __inline struct bintime
sbttobt(sbintime_t _sbt)151 sbttobt(sbintime_t _sbt)
152 {
153 struct bintime _bt;
154
155 _bt.sec = _sbt >> 32;
156 _bt.frac = _sbt << 32;
157 return (_bt);
158 }
159
160 /*
161 * Decimal<->sbt conversions. Multiplying or dividing by SBT_1NS results in
162 * large roundoff errors which sbttons() and nstosbt() avoid. Millisecond and
163 * microsecond functions are also provided for completeness.
164 *
165 * These functions return the smallest sbt larger or equal to the
166 * number of seconds requested so that sbttoX(Xtosbt(y)) == y. Unlike
167 * top of second computations below, which require that we tick at the
168 * top of second, these need to be rounded up so we do whatever for at
169 * least as long as requested.
170 *
171 * The naive computation we'd do is this
172 * ((unit * 2^64 / SIFACTOR) + 2^32-1) >> 32
173 * However, that overflows. Instead, we compute
174 * ((unit * 2^63 / SIFACTOR) + 2^31-1) >> 32
175 * and use pre-computed constants that are the ceil of the 2^63 / SIFACTOR
176 * term to ensure we are using exactly the right constant. We use the lesser
177 * evil of ull rather than a uint64_t cast to ensure we have well defined
178 * right shift semantics. With these changes, we get all the ns, us and ms
179 * conversions back and forth right.
180 * Note: This file is used for both kernel and userland includes, so we can't
181 * rely on KASSERT being defined, nor can we pollute the namespace by including
182 * assert.h.
183 */
184 static __inline int64_t
sbttons(sbintime_t _sbt)185 sbttons(sbintime_t _sbt)
186 {
187 uint64_t ns;
188
189 #ifdef KASSERT
190 KASSERT(_sbt >= 0, ("Negative values illegal for sbttons: %jx", _sbt));
191 #endif
192 ns = _sbt;
193 if (ns >= SBT_1S)
194 ns = (ns >> 32) * 1000000000;
195 else
196 ns = 0;
197
198 return (ns + (1000000000 * (_sbt & 0xffffffffu) >> 32));
199 }
200
201 static __inline sbintime_t
nstosbt(int64_t _ns)202 nstosbt(int64_t _ns)
203 {
204 sbintime_t sb = 0;
205
206 #ifdef KASSERT
207 KASSERT(_ns >= 0, ("Negative values illegal for nstosbt: %jd", _ns));
208 #endif
209 if (_ns >= 1000000000) {
210 sb = (_ns / 1000000000) * SBT_1S;
211 _ns = _ns % 1000000000;
212 }
213 /* 9223372037 = ceil(2^63 / 1000000000) */
214 sb += ((_ns * 9223372037ull) + 0x7fffffff) >> 31;
215 return (sb);
216 }
217
218 static __inline int64_t
sbttous(sbintime_t _sbt)219 sbttous(sbintime_t _sbt)
220 {
221
222 #ifdef KASSERT
223 KASSERT(_sbt >= 0, ("Negative values illegal for sbttous: %jx", _sbt));
224 #endif
225 return ((_sbt >> 32) * 1000000 +
226 (1000000 * (_sbt & 0xffffffffu) >> 32));
227 }
228
229 static __inline sbintime_t
ustosbt(int64_t _us)230 ustosbt(int64_t _us)
231 {
232 sbintime_t sb = 0;
233
234 #ifdef KASSERT
235 KASSERT(_us >= 0, ("Negative values illegal for ustosbt: %jd", _us));
236 #endif
237 if (_us >= 1000000) {
238 sb = (_us / 1000000) * SBT_1S;
239 _us = _us % 1000000;
240 }
241 /* 9223372036855 = ceil(2^63 / 1000000) */
242 sb += ((_us * 9223372036855ull) + 0x7fffffff) >> 31;
243 return (sb);
244 }
245
246 static __inline int64_t
sbttoms(sbintime_t _sbt)247 sbttoms(sbintime_t _sbt)
248 {
249 #ifdef KASSERT
250 KASSERT(_sbt >= 0, ("Negative values illegal for sbttoms: %jx", _sbt));
251 #endif
252 return ((_sbt >> 32) * 1000 + (1000 * (_sbt & 0xffffffffu) >> 32));
253 }
254
255 static __inline sbintime_t
mstosbt(int64_t _ms)256 mstosbt(int64_t _ms)
257 {
258 sbintime_t sb = 0;
259
260 #ifdef KASSERT
261 KASSERT(_ms >= 0, ("Negative values illegal for mstosbt: %jd", _ms));
262 #endif
263 if (_ms >= 1000) {
264 sb = (_ms / 1000) * SBT_1S;
265 _ms = _ms % 1000;
266 }
267 /* 9223372036854776 = ceil(2^63 / 1000) */
268 sb += ((_ms * 9223372036854776ull) + 0x7fffffff) >> 31;
269 return (sb);
270 }
271
272 /*-
273 * Background information:
274 *
275 * When converting between timestamps on parallel timescales of differing
276 * resolutions it is historical and scientific practice to round down rather
277 * than doing 4/5 rounding.
278 *
279 * The date changes at midnight, not at noon.
280 *
281 * Even at 15:59:59.999999999 it's not four'o'clock.
282 *
283 * time_second ticks after N.999999999 not after N.4999999999
284 */
285
286 static __inline void
bintime2timespec(const struct bintime * _bt,struct timespec * _ts)287 bintime2timespec(const struct bintime *_bt, struct timespec *_ts)
288 {
289
290 _ts->tv_sec = _bt->sec;
291 _ts->tv_nsec = ((uint64_t)1000000000 *
292 (uint32_t)(_bt->frac >> 32)) >> 32;
293 }
294
295 static __inline void
timespec2bintime(const struct timespec * _ts,struct bintime * _bt)296 timespec2bintime(const struct timespec *_ts, struct bintime *_bt)
297 {
298
299 _bt->sec = _ts->tv_sec;
300 /* 18446744073 = int(2^64 / 1000000000) */
301 _bt->frac = _ts->tv_nsec * (uint64_t)18446744073LL;
302 }
303
304 static __inline void
bintime2timeval(const struct bintime * _bt,struct timeval * _tv)305 bintime2timeval(const struct bintime *_bt, struct timeval *_tv)
306 {
307
308 _tv->tv_sec = _bt->sec;
309 _tv->tv_usec = ((uint64_t)1000000 * (uint32_t)(_bt->frac >> 32)) >> 32;
310 }
311
312 static __inline void
timeval2bintime(const struct timeval * _tv,struct bintime * _bt)313 timeval2bintime(const struct timeval *_tv, struct bintime *_bt)
314 {
315
316 _bt->sec = _tv->tv_sec;
317 /* 18446744073709 = int(2^64 / 1000000) */
318 _bt->frac = _tv->tv_usec * (uint64_t)18446744073709LL;
319 }
320
321 static __inline struct timespec
sbttots(sbintime_t _sbt)322 sbttots(sbintime_t _sbt)
323 {
324 struct timespec _ts;
325
326 _ts.tv_sec = _sbt >> 32;
327 _ts.tv_nsec = sbttons((uint32_t)_sbt);
328 return (_ts);
329 }
330
331 static __inline sbintime_t
tstosbt(struct timespec _ts)332 tstosbt(struct timespec _ts)
333 {
334
335 return (((sbintime_t)_ts.tv_sec << 32) + nstosbt(_ts.tv_nsec));
336 }
337
338 static __inline struct timeval
sbttotv(sbintime_t _sbt)339 sbttotv(sbintime_t _sbt)
340 {
341 struct timeval _tv;
342
343 _tv.tv_sec = _sbt >> 32;
344 _tv.tv_usec = sbttous((uint32_t)_sbt);
345 return (_tv);
346 }
347
348 static __inline sbintime_t
tvtosbt(struct timeval _tv)349 tvtosbt(struct timeval _tv)
350 {
351
352 return (((sbintime_t)_tv.tv_sec << 32) + ustosbt(_tv.tv_usec));
353 }
354 #endif /* __BSD_VISIBLE */
355
356 #ifdef _KERNEL
357 /*
358 * Simple macros to convert ticks to milliseconds
359 * or microseconds and vice-versa. The answer
360 * will always be at least 1. Note the return
361 * value is a uint32_t however we step up the
362 * operations to 64 bit to avoid any overflow/underflow
363 * problems.
364 */
365 #define TICKS_2_MSEC(t) max(1, (uint32_t)(hz == 1000) ? \
366 (t) : (((uint64_t)(t) * (uint64_t)1000)/(uint64_t)hz))
367 #define TICKS_2_USEC(t) max(1, (uint32_t)(hz == 1000) ? \
368 ((t) * 1000) : (((uint64_t)(t) * (uint64_t)1000000)/(uint64_t)hz))
369 #define MSEC_2_TICKS(m) max(1, (uint32_t)((hz == 1000) ? \
370 (m) : ((uint64_t)(m) * (uint64_t)hz)/(uint64_t)1000))
371 #define USEC_2_TICKS(u) max(1, (uint32_t)((hz == 1000) ? \
372 ((u) / 1000) : ((uint64_t)(u) * (uint64_t)hz)/(uint64_t)1000000))
373
374 #endif
375 /* Operations on timespecs */
376 #define timespecclear(tvp) ((tvp)->tv_sec = (tvp)->tv_nsec = 0)
377 #define timespecisset(tvp) ((tvp)->tv_sec || (tvp)->tv_nsec)
378 #define timespeccmp(tvp, uvp, cmp) \
379 (((tvp)->tv_sec == (uvp)->tv_sec) ? \
380 ((tvp)->tv_nsec cmp (uvp)->tv_nsec) : \
381 ((tvp)->tv_sec cmp (uvp)->tv_sec))
382
383 #define timespecadd(tsp, usp, vsp) \
384 do { \
385 (vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec; \
386 (vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec; \
387 if ((vsp)->tv_nsec >= 1000000000L) { \
388 (vsp)->tv_sec++; \
389 (vsp)->tv_nsec -= 1000000000L; \
390 } \
391 } while (0)
392 #define timespecsub(tsp, usp, vsp) \
393 do { \
394 (vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec; \
395 (vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec; \
396 if ((vsp)->tv_nsec < 0) { \
397 (vsp)->tv_sec--; \
398 (vsp)->tv_nsec += 1000000000L; \
399 } \
400 } while (0)
401
402 #ifdef _KERNEL
403
404 /* Operations on timevals. */
405
406 #define timevalclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
407 #define timevalisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
408 #define timevalcmp(tvp, uvp, cmp) \
409 (((tvp)->tv_sec == (uvp)->tv_sec) ? \
410 ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
411 ((tvp)->tv_sec cmp (uvp)->tv_sec))
412
413 /* timevaladd and timevalsub are not inlined */
414
415 #endif /* _KERNEL */
416
417 #ifndef _KERNEL /* NetBSD/OpenBSD compatible interfaces */
418
419 #define timerclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
420 #define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
421 #define timercmp(tvp, uvp, cmp) \
422 (((tvp)->tv_sec == (uvp)->tv_sec) ? \
423 ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
424 ((tvp)->tv_sec cmp (uvp)->tv_sec))
425 #define timeradd(tvp, uvp, vvp) \
426 do { \
427 (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \
428 (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
429 if ((vvp)->tv_usec >= 1000000) { \
430 (vvp)->tv_sec++; \
431 (vvp)->tv_usec -= 1000000; \
432 } \
433 } while (0)
434 #define timersub(tvp, uvp, vvp) \
435 do { \
436 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
437 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
438 if ((vvp)->tv_usec < 0) { \
439 (vvp)->tv_sec--; \
440 (vvp)->tv_usec += 1000000; \
441 } \
442 } while (0)
443 #endif
444
445 /*
446 * Names of the interval timers, and structure
447 * defining a timer setting.
448 */
449 #define ITIMER_REAL 0
450 #define ITIMER_VIRTUAL 1
451 #define ITIMER_PROF 2
452
453 struct itimerval {
454 struct timeval it_interval; /* timer interval */
455 struct timeval it_value; /* current value */
456 };
457
458 /*
459 * Getkerninfo clock information structure
460 */
461 struct clockinfo {
462 int hz; /* clock frequency */
463 int tick; /* micro-seconds per hz tick */
464 int spare;
465 int stathz; /* statistics clock frequency */
466 int profhz; /* profiling clock frequency */
467 };
468
469 /* These macros are also in time.h. */
470 #ifndef CLOCK_REALTIME
471 #define CLOCK_REALTIME 0
472 #endif
473 #ifndef CLOCK_VIRTUAL
474 #define CLOCK_VIRTUAL 1
475 #define CLOCK_PROF 2
476 #endif
477 #ifndef CLOCK_MONOTONIC
478 #define CLOCK_MONOTONIC 4
479 #define CLOCK_UPTIME 5 /* FreeBSD-specific. */
480 #define CLOCK_UPTIME_PRECISE 7 /* FreeBSD-specific. */
481 #define CLOCK_UPTIME_FAST 8 /* FreeBSD-specific. */
482 #define CLOCK_REALTIME_PRECISE 9 /* FreeBSD-specific. */
483 #define CLOCK_REALTIME_FAST 10 /* FreeBSD-specific. */
484 #define CLOCK_MONOTONIC_PRECISE 11 /* FreeBSD-specific. */
485 #define CLOCK_MONOTONIC_FAST 12 /* FreeBSD-specific. */
486 #define CLOCK_SECOND 13 /* FreeBSD-specific. */
487 #define CLOCK_THREAD_CPUTIME_ID 14
488 #define CLOCK_PROCESS_CPUTIME_ID 15
489 #endif
490
491 #ifndef TIMER_ABSTIME
492 #define TIMER_RELTIME 0x0 /* relative timer */
493 #define TIMER_ABSTIME 0x1 /* absolute timer */
494 #endif
495
496 #if __BSD_VISIBLE
497 #define CPUCLOCK_WHICH_PID 0
498 #define CPUCLOCK_WHICH_TID 1
499 #endif
500
501 #ifdef _KERNEL
502
503 /*
504 * Kernel to clock driver interface.
505 */
506 void inittodr(time_t base);
507 void resettodr(void);
508
509 extern volatile time_t time_second;
510 extern volatile time_t time_uptime;
511 extern struct bintime tc_tick_bt;
512 extern sbintime_t tc_tick_sbt;
513 extern struct bintime tick_bt;
514 extern sbintime_t tick_sbt;
515 extern int tc_precexp;
516 extern int tc_timepercentage;
517 extern struct bintime bt_timethreshold;
518 extern struct bintime bt_tickthreshold;
519 extern sbintime_t sbt_timethreshold;
520 extern sbintime_t sbt_tickthreshold;
521
522 extern volatile int rtc_generation;
523
524 /*
525 * Functions for looking at our clock: [get]{bin,nano,micro}[up]time()
526 *
527 * Functions without the "get" prefix returns the best timestamp
528 * we can produce in the given format.
529 *
530 * "bin" == struct bintime == seconds + 64 bit fraction of seconds.
531 * "nano" == struct timespec == seconds + nanoseconds.
532 * "micro" == struct timeval == seconds + microseconds.
533 *
534 * Functions containing "up" returns time relative to boot and
535 * should be used for calculating time intervals.
536 *
537 * Functions without "up" returns UTC time.
538 *
539 * Functions with the "get" prefix returns a less precise result
540 * much faster than the functions without "get" prefix and should
541 * be used where a precision of 1/hz seconds is acceptable or where
542 * performance is priority. (NB: "precision", _not_ "resolution" !)
543 */
544
545 void binuptime(struct bintime *bt);
546 void nanouptime(struct timespec *tsp);
547 void microuptime(struct timeval *tvp);
548
549 static __inline sbintime_t
sbinuptime(void)550 sbinuptime(void)
551 {
552 struct bintime _bt;
553
554 binuptime(&_bt);
555 return (bttosbt(_bt));
556 }
557
558 void bintime(struct bintime *bt);
559 void nanotime(struct timespec *tsp);
560 void microtime(struct timeval *tvp);
561
562 void getbinuptime(struct bintime *bt);
563 void getnanouptime(struct timespec *tsp);
564 void getmicrouptime(struct timeval *tvp);
565
566 static __inline sbintime_t
getsbinuptime(void)567 getsbinuptime(void)
568 {
569 struct bintime _bt;
570
571 getbinuptime(&_bt);
572 return (bttosbt(_bt));
573 }
574
575 void getbintime(struct bintime *bt);
576 void getnanotime(struct timespec *tsp);
577 void getmicrotime(struct timeval *tvp);
578
579 void getboottime(struct timeval *boottime);
580 void getboottimebin(struct bintime *boottimebin);
581
582 /* Other functions */
583 int itimerdecr(struct itimerval *itp, int usec);
584 int itimerfix(struct timeval *tv);
585 int ppsratecheck(struct timeval *, int *, int);
586 int ratecheck(struct timeval *, const struct timeval *);
587 void timevaladd(struct timeval *t1, const struct timeval *t2);
588 void timevalsub(struct timeval *t1, const struct timeval *t2);
589 int tvtohz(struct timeval *tv);
590
591 #define TC_DEFAULTPERC 5
592
593 #define BT2FREQ(bt) \
594 (((uint64_t)0x8000000000000000 + ((bt)->frac >> 2)) / \
595 ((bt)->frac >> 1))
596
597 #define SBT2FREQ(sbt) ((SBT_1S + ((sbt) >> 1)) / (sbt))
598
599 #define FREQ2BT(freq, bt) \
600 { \
601 (bt)->sec = 0; \
602 (bt)->frac = ((uint64_t)0x8000000000000000 / (freq)) << 1; \
603 }
604
605 #define TIMESEL(sbt, sbt2) \
606 (((sbt2) >= sbt_timethreshold) ? \
607 ((*(sbt) = getsbinuptime()), 1) : ((*(sbt) = sbinuptime()), 0))
608
609 #else /* !_KERNEL */
610 #include <time.h>
611
612 #include <sys/cdefs.h>
613 #include <sys/select.h>
614
615 __BEGIN_DECLS
616 int setitimer(int, const struct itimerval *, struct itimerval *);
617 int utimes(const char *, const struct timeval *);
618
619 #if __BSD_VISIBLE
620 int adjtime(const struct timeval *, struct timeval *);
621 int clock_getcpuclockid2(id_t, int, clockid_t *);
622 int futimes(int, const struct timeval *);
623 int futimesat(int, const char *, const struct timeval [2]);
624 int lutimes(const char *, const struct timeval *);
625 int settimeofday(const struct timeval *, const struct timezone *);
626 #endif
627
628 #if __XSI_VISIBLE
629 int getitimer(int, struct itimerval *);
630 int gettimeofday(struct timeval *, struct timezone *);
631 #endif
632
633 __END_DECLS
634
635 #endif /* !_KERNEL */
636
637 #endif /* !_SYS_TIME_H_ */
638