1 #include "Python.h"
2 #ifdef MS_WINDOWS
3 #include <windows.h>
4 #endif
5
6 #if defined(__APPLE__)
7 #include <mach/mach_time.h> /* mach_absolute_time(), mach_timebase_info() */
8 #endif
9
10 #define _PyTime_check_mul_overflow(a, b) \
11 (assert(b > 0), \
12 (_PyTime_t)(a) < _PyTime_MIN / (_PyTime_t)(b) \
13 || _PyTime_MAX / (_PyTime_t)(b) < (_PyTime_t)(a))
14
15 /* To millisecond (10^-3) */
16 #define SEC_TO_MS 1000
17
18 /* To microseconds (10^-6) */
19 #define MS_TO_US 1000
20 #define SEC_TO_US (SEC_TO_MS * MS_TO_US)
21
22 /* To nanoseconds (10^-9) */
23 #define US_TO_NS 1000
24 #define MS_TO_NS (MS_TO_US * US_TO_NS)
25 #define SEC_TO_NS (SEC_TO_MS * MS_TO_NS)
26
27 /* Conversion from nanoseconds */
28 #define NS_TO_MS (1000 * 1000)
29 #define NS_TO_US (1000)
30
31 static void
error_time_t_overflow(void)32 error_time_t_overflow(void)
33 {
34 PyErr_SetString(PyExc_OverflowError,
35 "timestamp out of range for platform time_t");
36 }
37
38 time_t
_PyLong_AsTime_t(PyObject * obj)39 _PyLong_AsTime_t(PyObject *obj)
40 {
41 #if SIZEOF_TIME_T == SIZEOF_LONG_LONG
42 long long val;
43 val = PyLong_AsLongLong(obj);
44 #else
45 long val;
46 Py_BUILD_ASSERT(sizeof(time_t) <= sizeof(long));
47 val = PyLong_AsLong(obj);
48 #endif
49 if (val == -1 && PyErr_Occurred()) {
50 if (PyErr_ExceptionMatches(PyExc_OverflowError))
51 error_time_t_overflow();
52 return -1;
53 }
54 return (time_t)val;
55 }
56
57 PyObject *
_PyLong_FromTime_t(time_t t)58 _PyLong_FromTime_t(time_t t)
59 {
60 #if SIZEOF_TIME_T == SIZEOF_LONG_LONG
61 return PyLong_FromLongLong((long long)t);
62 #else
63 Py_BUILD_ASSERT(sizeof(time_t) <= sizeof(long));
64 return PyLong_FromLong((long)t);
65 #endif
66 }
67
68 /* Round to nearest with ties going to nearest even integer
69 (_PyTime_ROUND_HALF_EVEN) */
70 static double
_PyTime_RoundHalfEven(double x)71 _PyTime_RoundHalfEven(double x)
72 {
73 double rounded = round(x);
74 if (fabs(x-rounded) == 0.5)
75 /* halfway case: round to even */
76 rounded = 2.0*round(x/2.0);
77 return rounded;
78 }
79
80 static double
_PyTime_Round(double x,_PyTime_round_t round)81 _PyTime_Round(double x, _PyTime_round_t round)
82 {
83 /* volatile avoids optimization changing how numbers are rounded */
84 volatile double d;
85
86 d = x;
87 if (round == _PyTime_ROUND_HALF_EVEN)
88 d = _PyTime_RoundHalfEven(d);
89 else if (round == _PyTime_ROUND_CEILING)
90 d = ceil(d);
91 else
92 d = floor(d);
93 return d;
94 }
95
96 static int
_PyTime_DoubleToDenominator(double d,time_t * sec,long * numerator,double denominator,_PyTime_round_t round)97 _PyTime_DoubleToDenominator(double d, time_t *sec, long *numerator,
98 double denominator, _PyTime_round_t round)
99 {
100 double intpart, err;
101 /* volatile avoids optimization changing how numbers are rounded */
102 volatile double floatpart;
103
104 floatpart = modf(d, &intpart);
105
106 floatpart *= denominator;
107 floatpart = _PyTime_Round(floatpart, round);
108 if (floatpart >= denominator) {
109 floatpart -= denominator;
110 intpart += 1.0;
111 }
112 else if (floatpart < 0) {
113 floatpart += denominator;
114 intpart -= 1.0;
115 }
116 assert(0.0 <= floatpart && floatpart < denominator);
117
118 *sec = (time_t)intpart;
119 *numerator = (long)floatpart;
120
121 err = intpart - (double)*sec;
122 if (err <= -1.0 || err >= 1.0) {
123 error_time_t_overflow();
124 return -1;
125 }
126 return 0;
127 }
128
129 static int
_PyTime_ObjectToDenominator(PyObject * obj,time_t * sec,long * numerator,double denominator,_PyTime_round_t round)130 _PyTime_ObjectToDenominator(PyObject *obj, time_t *sec, long *numerator,
131 double denominator, _PyTime_round_t round)
132 {
133 assert(denominator <= (double)LONG_MAX);
134
135 if (PyFloat_Check(obj)) {
136 double d = PyFloat_AsDouble(obj);
137 return _PyTime_DoubleToDenominator(d, sec, numerator,
138 denominator, round);
139 }
140 else {
141 *sec = _PyLong_AsTime_t(obj);
142 *numerator = 0;
143 if (*sec == (time_t)-1 && PyErr_Occurred())
144 return -1;
145 return 0;
146 }
147 }
148
149 int
_PyTime_ObjectToTime_t(PyObject * obj,time_t * sec,_PyTime_round_t round)150 _PyTime_ObjectToTime_t(PyObject *obj, time_t *sec, _PyTime_round_t round)
151 {
152 if (PyFloat_Check(obj)) {
153 double intpart, err;
154 /* volatile avoids optimization changing how numbers are rounded */
155 volatile double d;
156
157 d = PyFloat_AsDouble(obj);
158 d = _PyTime_Round(d, round);
159 (void)modf(d, &intpart);
160
161 *sec = (time_t)intpart;
162 err = intpart - (double)*sec;
163 if (err <= -1.0 || err >= 1.0) {
164 error_time_t_overflow();
165 return -1;
166 }
167 return 0;
168 }
169 else {
170 *sec = _PyLong_AsTime_t(obj);
171 if (*sec == (time_t)-1 && PyErr_Occurred())
172 return -1;
173 return 0;
174 }
175 }
176
177 int
_PyTime_ObjectToTimespec(PyObject * obj,time_t * sec,long * nsec,_PyTime_round_t round)178 _PyTime_ObjectToTimespec(PyObject *obj, time_t *sec, long *nsec,
179 _PyTime_round_t round)
180 {
181 int res;
182 res = _PyTime_ObjectToDenominator(obj, sec, nsec, 1e9, round);
183 assert(0 <= *nsec && *nsec < SEC_TO_NS);
184 return res;
185 }
186
187 int
_PyTime_ObjectToTimeval(PyObject * obj,time_t * sec,long * usec,_PyTime_round_t round)188 _PyTime_ObjectToTimeval(PyObject *obj, time_t *sec, long *usec,
189 _PyTime_round_t round)
190 {
191 int res;
192 res = _PyTime_ObjectToDenominator(obj, sec, usec, 1e6, round);
193 assert(0 <= *usec && *usec < SEC_TO_US);
194 return res;
195 }
196
197 static void
_PyTime_overflow(void)198 _PyTime_overflow(void)
199 {
200 PyErr_SetString(PyExc_OverflowError,
201 "timestamp too large to convert to C _PyTime_t");
202 }
203
204 _PyTime_t
_PyTime_FromSeconds(int seconds)205 _PyTime_FromSeconds(int seconds)
206 {
207 _PyTime_t t;
208 t = (_PyTime_t)seconds;
209 /* ensure that integer overflow cannot happen, int type should have 32
210 bits, whereas _PyTime_t type has at least 64 bits (SEC_TO_MS takes 30
211 bits). */
212 Py_BUILD_ASSERT(INT_MAX <= _PyTime_MAX / SEC_TO_NS);
213 Py_BUILD_ASSERT(INT_MIN >= _PyTime_MIN / SEC_TO_NS);
214 assert((t >= 0 && t <= _PyTime_MAX / SEC_TO_NS)
215 || (t < 0 && t >= _PyTime_MIN / SEC_TO_NS));
216 t *= SEC_TO_NS;
217 return t;
218 }
219
220 _PyTime_t
_PyTime_FromNanoseconds(long long ns)221 _PyTime_FromNanoseconds(long long ns)
222 {
223 _PyTime_t t;
224 Py_BUILD_ASSERT(sizeof(long long) <= sizeof(_PyTime_t));
225 t = Py_SAFE_DOWNCAST(ns, long long, _PyTime_t);
226 return t;
227 }
228
229 #ifdef HAVE_CLOCK_GETTIME
230 static int
_PyTime_FromTimespec(_PyTime_t * tp,struct timespec * ts,int raise)231 _PyTime_FromTimespec(_PyTime_t *tp, struct timespec *ts, int raise)
232 {
233 _PyTime_t t;
234 int res = 0;
235
236 Py_BUILD_ASSERT(sizeof(ts->tv_sec) <= sizeof(_PyTime_t));
237 t = (_PyTime_t)ts->tv_sec;
238
239 if (_PyTime_check_mul_overflow(t, SEC_TO_NS)) {
240 if (raise)
241 _PyTime_overflow();
242 res = -1;
243 }
244 t = t * SEC_TO_NS;
245
246 t += ts->tv_nsec;
247
248 *tp = t;
249 return res;
250 }
251 #elif !defined(MS_WINDOWS)
252 static int
_PyTime_FromTimeval(_PyTime_t * tp,struct timeval * tv,int raise)253 _PyTime_FromTimeval(_PyTime_t *tp, struct timeval *tv, int raise)
254 {
255 _PyTime_t t;
256 int res = 0;
257
258 Py_BUILD_ASSERT(sizeof(tv->tv_sec) <= sizeof(_PyTime_t));
259 t = (_PyTime_t)tv->tv_sec;
260
261 if (_PyTime_check_mul_overflow(t, SEC_TO_NS)) {
262 if (raise)
263 _PyTime_overflow();
264 res = -1;
265 }
266 t = t * SEC_TO_NS;
267
268 t += (_PyTime_t)tv->tv_usec * US_TO_NS;
269
270 *tp = t;
271 return res;
272 }
273 #endif
274
275 static int
_PyTime_FromFloatObject(_PyTime_t * t,double value,_PyTime_round_t round,long unit_to_ns)276 _PyTime_FromFloatObject(_PyTime_t *t, double value, _PyTime_round_t round,
277 long unit_to_ns)
278 {
279 double err;
280 /* volatile avoids optimization changing how numbers are rounded */
281 volatile double d;
282
283 /* convert to a number of nanoseconds */
284 d = value;
285 d *= (double)unit_to_ns;
286 d = _PyTime_Round(d, round);
287
288 *t = (_PyTime_t)d;
289 err = d - (double)*t;
290 if (fabs(err) >= 1.0) {
291 _PyTime_overflow();
292 return -1;
293 }
294 return 0;
295 }
296
297 static int
_PyTime_FromObject(_PyTime_t * t,PyObject * obj,_PyTime_round_t round,long unit_to_ns)298 _PyTime_FromObject(_PyTime_t *t, PyObject *obj, _PyTime_round_t round,
299 long unit_to_ns)
300 {
301 if (PyFloat_Check(obj)) {
302 double d;
303 d = PyFloat_AsDouble(obj);
304 return _PyTime_FromFloatObject(t, d, round, unit_to_ns);
305 }
306 else {
307 long long sec;
308 Py_BUILD_ASSERT(sizeof(long long) <= sizeof(_PyTime_t));
309
310 sec = PyLong_AsLongLong(obj);
311 if (sec == -1 && PyErr_Occurred()) {
312 if (PyErr_ExceptionMatches(PyExc_OverflowError))
313 _PyTime_overflow();
314 return -1;
315 }
316
317 if (_PyTime_check_mul_overflow(sec, unit_to_ns)) {
318 _PyTime_overflow();
319 return -1;
320 }
321 *t = sec * unit_to_ns;
322 return 0;
323 }
324 }
325
326 int
_PyTime_FromSecondsObject(_PyTime_t * t,PyObject * obj,_PyTime_round_t round)327 _PyTime_FromSecondsObject(_PyTime_t *t, PyObject *obj, _PyTime_round_t round)
328 {
329 return _PyTime_FromObject(t, obj, round, SEC_TO_NS);
330 }
331
332 int
_PyTime_FromMillisecondsObject(_PyTime_t * t,PyObject * obj,_PyTime_round_t round)333 _PyTime_FromMillisecondsObject(_PyTime_t *t, PyObject *obj, _PyTime_round_t round)
334 {
335 return _PyTime_FromObject(t, obj, round, MS_TO_NS);
336 }
337
338 double
_PyTime_AsSecondsDouble(_PyTime_t t)339 _PyTime_AsSecondsDouble(_PyTime_t t)
340 {
341 /* volatile avoids optimization changing how numbers are rounded */
342 volatile double d;
343
344 if (t % SEC_TO_NS == 0) {
345 _PyTime_t secs;
346 /* Divide using integers to avoid rounding issues on the integer part.
347 1e-9 cannot be stored exactly in IEEE 64-bit. */
348 secs = t / SEC_TO_NS;
349 d = (double)secs;
350 }
351 else {
352 d = (double)t;
353 d /= 1e9;
354 }
355 return d;
356 }
357
358 PyObject *
_PyTime_AsNanosecondsObject(_PyTime_t t)359 _PyTime_AsNanosecondsObject(_PyTime_t t)
360 {
361 Py_BUILD_ASSERT(sizeof(long long) >= sizeof(_PyTime_t));
362 return PyLong_FromLongLong((long long)t);
363 }
364
365 static _PyTime_t
_PyTime_Divide(const _PyTime_t t,const _PyTime_t k,const _PyTime_round_t round)366 _PyTime_Divide(const _PyTime_t t, const _PyTime_t k,
367 const _PyTime_round_t round)
368 {
369 assert(k > 1);
370 if (round == _PyTime_ROUND_HALF_EVEN) {
371 _PyTime_t x, r, abs_r;
372 x = t / k;
373 r = t % k;
374 abs_r = Py_ABS(r);
375 if (abs_r > k / 2 || (abs_r == k / 2 && (Py_ABS(x) & 1))) {
376 if (t >= 0)
377 x++;
378 else
379 x--;
380 }
381 return x;
382 }
383 else if (round == _PyTime_ROUND_CEILING) {
384 if (t >= 0)
385 return (t + k - 1) / k;
386 else
387 return t / k;
388 }
389 else {
390 if (t >= 0)
391 return t / k;
392 else
393 return (t - (k - 1)) / k;
394 }
395 }
396
397 _PyTime_t
_PyTime_AsMilliseconds(_PyTime_t t,_PyTime_round_t round)398 _PyTime_AsMilliseconds(_PyTime_t t, _PyTime_round_t round)
399 {
400 return _PyTime_Divide(t, NS_TO_MS, round);
401 }
402
403 _PyTime_t
_PyTime_AsMicroseconds(_PyTime_t t,_PyTime_round_t round)404 _PyTime_AsMicroseconds(_PyTime_t t, _PyTime_round_t round)
405 {
406 return _PyTime_Divide(t, NS_TO_US, round);
407 }
408
409 static int
_PyTime_AsTimeval_impl(_PyTime_t t,_PyTime_t * p_secs,int * p_us,_PyTime_round_t round)410 _PyTime_AsTimeval_impl(_PyTime_t t, _PyTime_t *p_secs, int *p_us,
411 _PyTime_round_t round)
412 {
413 _PyTime_t secs, ns;
414 int usec;
415 int res = 0;
416
417 secs = t / SEC_TO_NS;
418 ns = t % SEC_TO_NS;
419
420 usec = (int)_PyTime_Divide(ns, US_TO_NS, round);
421 if (usec < 0) {
422 usec += SEC_TO_US;
423 if (secs != _PyTime_MIN)
424 secs -= 1;
425 else
426 res = -1;
427 }
428 else if (usec >= SEC_TO_US) {
429 usec -= SEC_TO_US;
430 if (secs != _PyTime_MAX)
431 secs += 1;
432 else
433 res = -1;
434 }
435 assert(0 <= usec && usec < SEC_TO_US);
436
437 *p_secs = secs;
438 *p_us = usec;
439
440 return res;
441 }
442
443 static int
_PyTime_AsTimevalStruct_impl(_PyTime_t t,struct timeval * tv,_PyTime_round_t round,int raise)444 _PyTime_AsTimevalStruct_impl(_PyTime_t t, struct timeval *tv,
445 _PyTime_round_t round, int raise)
446 {
447 _PyTime_t secs, secs2;
448 int us;
449 int res;
450
451 res = _PyTime_AsTimeval_impl(t, &secs, &us, round);
452
453 #ifdef MS_WINDOWS
454 tv->tv_sec = (long)secs;
455 #else
456 tv->tv_sec = secs;
457 #endif
458 tv->tv_usec = us;
459
460 secs2 = (_PyTime_t)tv->tv_sec;
461 if (res < 0 || secs2 != secs) {
462 if (raise)
463 error_time_t_overflow();
464 return -1;
465 }
466 return 0;
467 }
468
469 int
_PyTime_AsTimeval(_PyTime_t t,struct timeval * tv,_PyTime_round_t round)470 _PyTime_AsTimeval(_PyTime_t t, struct timeval *tv, _PyTime_round_t round)
471 {
472 return _PyTime_AsTimevalStruct_impl(t, tv, round, 1);
473 }
474
475 int
_PyTime_AsTimeval_noraise(_PyTime_t t,struct timeval * tv,_PyTime_round_t round)476 _PyTime_AsTimeval_noraise(_PyTime_t t, struct timeval *tv, _PyTime_round_t round)
477 {
478 return _PyTime_AsTimevalStruct_impl(t, tv, round, 0);
479 }
480
481 int
_PyTime_AsTimevalTime_t(_PyTime_t t,time_t * p_secs,int * us,_PyTime_round_t round)482 _PyTime_AsTimevalTime_t(_PyTime_t t, time_t *p_secs, int *us,
483 _PyTime_round_t round)
484 {
485 _PyTime_t secs;
486 int res;
487
488 res = _PyTime_AsTimeval_impl(t, &secs, us, round);
489
490 *p_secs = secs;
491
492 if (res < 0 || (_PyTime_t)*p_secs != secs) {
493 error_time_t_overflow();
494 return -1;
495 }
496 return 0;
497 }
498
499
500 #if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_KQUEUE)
501 int
_PyTime_AsTimespec(_PyTime_t t,struct timespec * ts)502 _PyTime_AsTimespec(_PyTime_t t, struct timespec *ts)
503 {
504 _PyTime_t secs, nsec;
505
506 secs = t / SEC_TO_NS;
507 nsec = t % SEC_TO_NS;
508 if (nsec < 0) {
509 nsec += SEC_TO_NS;
510 secs -= 1;
511 }
512 ts->tv_sec = (time_t)secs;
513 assert(0 <= nsec && nsec < SEC_TO_NS);
514 ts->tv_nsec = nsec;
515
516 if ((_PyTime_t)ts->tv_sec != secs) {
517 error_time_t_overflow();
518 return -1;
519 }
520 return 0;
521 }
522 #endif
523
524 static int
pygettimeofday(_PyTime_t * tp,_Py_clock_info_t * info,int raise)525 pygettimeofday(_PyTime_t *tp, _Py_clock_info_t *info, int raise)
526 {
527 #ifdef MS_WINDOWS
528 FILETIME system_time;
529 ULARGE_INTEGER large;
530
531 assert(info == NULL || raise);
532
533 GetSystemTimeAsFileTime(&system_time);
534 large.u.LowPart = system_time.dwLowDateTime;
535 large.u.HighPart = system_time.dwHighDateTime;
536 /* 11,644,473,600,000,000,000: number of nanoseconds between
537 the 1st january 1601 and the 1st january 1970 (369 years + 89 leap
538 days). */
539 *tp = large.QuadPart * 100 - 11644473600000000000;
540 if (info) {
541 DWORD timeAdjustment, timeIncrement;
542 BOOL isTimeAdjustmentDisabled, ok;
543
544 info->implementation = "GetSystemTimeAsFileTime()";
545 info->monotonic = 0;
546 ok = GetSystemTimeAdjustment(&timeAdjustment, &timeIncrement,
547 &isTimeAdjustmentDisabled);
548 if (!ok) {
549 PyErr_SetFromWindowsErr(0);
550 return -1;
551 }
552 info->resolution = timeIncrement * 1e-7;
553 info->adjustable = 1;
554 }
555
556 #else /* MS_WINDOWS */
557 int err;
558 #ifdef HAVE_CLOCK_GETTIME
559 struct timespec ts;
560 #else
561 struct timeval tv;
562 #endif
563
564 assert(info == NULL || raise);
565
566 #ifdef HAVE_CLOCK_GETTIME
567 err = clock_gettime(CLOCK_REALTIME, &ts);
568 if (err) {
569 if (raise)
570 PyErr_SetFromErrno(PyExc_OSError);
571 return -1;
572 }
573 if (_PyTime_FromTimespec(tp, &ts, raise) < 0)
574 return -1;
575
576 if (info) {
577 struct timespec res;
578 info->implementation = "clock_gettime(CLOCK_REALTIME)";
579 info->monotonic = 0;
580 info->adjustable = 1;
581 if (clock_getres(CLOCK_REALTIME, &res) == 0)
582 info->resolution = res.tv_sec + res.tv_nsec * 1e-9;
583 else
584 info->resolution = 1e-9;
585 }
586 #else /* HAVE_CLOCK_GETTIME */
587
588 /* test gettimeofday() */
589 #ifdef GETTIMEOFDAY_NO_TZ
590 err = gettimeofday(&tv);
591 #else
592 err = gettimeofday(&tv, (struct timezone *)NULL);
593 #endif
594 if (err) {
595 if (raise)
596 PyErr_SetFromErrno(PyExc_OSError);
597 return -1;
598 }
599 if (_PyTime_FromTimeval(tp, &tv, raise) < 0)
600 return -1;
601
602 if (info) {
603 info->implementation = "gettimeofday()";
604 info->resolution = 1e-6;
605 info->monotonic = 0;
606 info->adjustable = 1;
607 }
608 #endif /* !HAVE_CLOCK_GETTIME */
609 #endif /* !MS_WINDOWS */
610 return 0;
611 }
612
613 _PyTime_t
_PyTime_GetSystemClock(void)614 _PyTime_GetSystemClock(void)
615 {
616 _PyTime_t t;
617 if (pygettimeofday(&t, NULL, 0) < 0) {
618 /* should not happen, _PyTime_Init() checked the clock at startup */
619 assert(0);
620
621 /* use a fixed value instead of a random value from the stack */
622 t = 0;
623 }
624 return t;
625 }
626
627 int
_PyTime_GetSystemClockWithInfo(_PyTime_t * t,_Py_clock_info_t * info)628 _PyTime_GetSystemClockWithInfo(_PyTime_t *t, _Py_clock_info_t *info)
629 {
630 return pygettimeofday(t, info, 1);
631 }
632
633 static int
pymonotonic(_PyTime_t * tp,_Py_clock_info_t * info,int raise)634 pymonotonic(_PyTime_t *tp, _Py_clock_info_t *info, int raise)
635 {
636 #if defined(MS_WINDOWS)
637 ULONGLONG ticks;
638 _PyTime_t t;
639
640 assert(info == NULL || raise);
641
642 ticks = GetTickCount64();
643 Py_BUILD_ASSERT(sizeof(ticks) <= sizeof(_PyTime_t));
644 t = (_PyTime_t)ticks;
645
646 if (_PyTime_check_mul_overflow(t, MS_TO_NS)) {
647 if (raise) {
648 _PyTime_overflow();
649 return -1;
650 }
651 /* Hello, time traveler! */
652 assert(0);
653 }
654 *tp = t * MS_TO_NS;
655
656 if (info) {
657 DWORD timeAdjustment, timeIncrement;
658 BOOL isTimeAdjustmentDisabled, ok;
659 info->implementation = "GetTickCount64()";
660 info->monotonic = 1;
661 ok = GetSystemTimeAdjustment(&timeAdjustment, &timeIncrement,
662 &isTimeAdjustmentDisabled);
663 if (!ok) {
664 PyErr_SetFromWindowsErr(0);
665 return -1;
666 }
667 info->resolution = timeIncrement * 1e-7;
668 info->adjustable = 0;
669 }
670
671 #elif defined(__APPLE__)
672 static mach_timebase_info_data_t timebase;
673 uint64_t time;
674
675 if (timebase.denom == 0) {
676 /* According to the Technical Q&A QA1398, mach_timebase_info() cannot
677 fail: https://developer.apple.com/library/mac/#qa/qa1398/ */
678 (void)mach_timebase_info(&timebase);
679 }
680
681 time = mach_absolute_time();
682
683 /* apply timebase factor */
684 time *= timebase.numer;
685 time /= timebase.denom;
686
687 *tp = time;
688
689 if (info) {
690 info->implementation = "mach_absolute_time()";
691 info->resolution = (double)timebase.numer / timebase.denom * 1e-9;
692 info->monotonic = 1;
693 info->adjustable = 0;
694 }
695
696 #else
697 struct timespec ts;
698 #ifdef CLOCK_HIGHRES
699 const clockid_t clk_id = CLOCK_HIGHRES;
700 const char *implementation = "clock_gettime(CLOCK_HIGHRES)";
701 #else
702 const clockid_t clk_id = CLOCK_MONOTONIC;
703 const char *implementation = "clock_gettime(CLOCK_MONOTONIC)";
704 #endif
705
706 assert(info == NULL || raise);
707
708 if (clock_gettime(clk_id, &ts) != 0) {
709 if (raise) {
710 PyErr_SetFromErrno(PyExc_OSError);
711 return -1;
712 }
713 return -1;
714 }
715
716 if (info) {
717 struct timespec res;
718 info->monotonic = 1;
719 info->implementation = implementation;
720 info->adjustable = 0;
721 if (clock_getres(clk_id, &res) != 0) {
722 PyErr_SetFromErrno(PyExc_OSError);
723 return -1;
724 }
725 info->resolution = res.tv_sec + res.tv_nsec * 1e-9;
726 }
727 if (_PyTime_FromTimespec(tp, &ts, raise) < 0)
728 return -1;
729 #endif
730 return 0;
731 }
732
733 _PyTime_t
_PyTime_GetMonotonicClock(void)734 _PyTime_GetMonotonicClock(void)
735 {
736 _PyTime_t t;
737 if (pymonotonic(&t, NULL, 0) < 0) {
738 /* should not happen, _PyTime_Init() checked that monotonic clock at
739 startup */
740 assert(0);
741
742 /* use a fixed value instead of a random value from the stack */
743 t = 0;
744 }
745 return t;
746 }
747
748 int
_PyTime_GetMonotonicClockWithInfo(_PyTime_t * tp,_Py_clock_info_t * info)749 _PyTime_GetMonotonicClockWithInfo(_PyTime_t *tp, _Py_clock_info_t *info)
750 {
751 return pymonotonic(tp, info, 1);
752 }
753
754 int
_PyTime_Init(void)755 _PyTime_Init(void)
756 {
757 _PyTime_t t;
758
759 /* ensure that the system clock works */
760 if (_PyTime_GetSystemClockWithInfo(&t, NULL) < 0)
761 return -1;
762
763 /* ensure that the operating system provides a monotonic clock */
764 if (_PyTime_GetMonotonicClockWithInfo(&t, NULL) < 0)
765 return -1;
766
767 return 0;
768 }
769
770 int
_PyTime_localtime(time_t t,struct tm * tm)771 _PyTime_localtime(time_t t, struct tm *tm)
772 {
773 #ifdef MS_WINDOWS
774 int error;
775
776 error = localtime_s(tm, &t);
777 if (error != 0) {
778 errno = error;
779 PyErr_SetFromErrno(PyExc_OSError);
780 return -1;
781 }
782 return 0;
783 #else /* !MS_WINDOWS */
784 if (localtime_r(&t, tm) == NULL) {
785 #ifdef EINVAL
786 if (errno == 0)
787 errno = EINVAL;
788 #endif
789 PyErr_SetFromErrno(PyExc_OSError);
790 return -1;
791 }
792 return 0;
793 #endif /* MS_WINDOWS */
794 }
795
796 int
_PyTime_gmtime(time_t t,struct tm * tm)797 _PyTime_gmtime(time_t t, struct tm *tm)
798 {
799 #ifdef MS_WINDOWS
800 int error;
801
802 error = gmtime_s(tm, &t);
803 if (error != 0) {
804 errno = error;
805 PyErr_SetFromErrno(PyExc_OSError);
806 return -1;
807 }
808 return 0;
809 #else /* !MS_WINDOWS */
810 if (gmtime_r(&t, tm) == NULL) {
811 #ifdef EINVAL
812 if (errno == 0)
813 errno = EINVAL;
814 #endif
815 PyErr_SetFromErrno(PyExc_OSError);
816 return -1;
817 }
818 return 0;
819 #endif /* MS_WINDOWS */
820 }
821