source: python/vendor/Python-2.7.6/Modules/timemodule.c

Last change on this file was 388, checked in by dmik, 11 years ago

python: Update vendor to 2.7.6.
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Line 
1
2/* Time module */
3
4#include "Python.h"
5#include "structseq.h"
6#include "timefuncs.h"
7
8#ifdef __APPLE__
9#if defined(HAVE_GETTIMEOFDAY) && defined(HAVE_FTIME)
10 /*
11 * floattime falls back to ftime when getttimeofday fails because the latter
12 * might fail on some platforms. This fallback is unwanted on MacOSX because
13 * that makes it impossible to use a binary build on OSX 10.4 on earlier
14 * releases of the OS. Therefore claim we don't support ftime.
15 */
16# undef HAVE_FTIME
17#endif
18#endif
19
20#include <ctype.h>
21
22#ifdef HAVE_SYS_TYPES_H
23#include <sys/types.h>
24#endif /* HAVE_SYS_TYPES_H */
25
26#ifdef QUICKWIN
27#include <io.h>
28#endif
29
30#ifdef HAVE_FTIME
31#include <sys/timeb.h>
32#if !defined(MS_WINDOWS) && !defined(PYOS_OS2)
33extern int ftime(struct timeb *);
34#endif /* MS_WINDOWS */
35#endif /* HAVE_FTIME */
36
37#if defined(__WATCOMC__) && !defined(__QNX__)
38#include <i86.h>
39#else
40#ifdef MS_WINDOWS
41#define WIN32_LEAN_AND_MEAN
42#include <windows.h>
43#include "pythread.h"
44
45/* helper to allow us to interrupt sleep() on Windows*/
46static HANDLE hInterruptEvent = NULL;
47static BOOL WINAPI PyCtrlHandler(DWORD dwCtrlType)
48{
49 SetEvent(hInterruptEvent);
50 /* allow other default handlers to be called.
51 Default Python handler will setup the
52 KeyboardInterrupt exception.
53 */
54 return FALSE;
55}
56static long main_thread;
57
58
59#if defined(__BORLANDC__)
60/* These overrides not needed for Win32 */
61#define timezone _timezone
62#define tzname _tzname
63#define daylight _daylight
64#endif /* __BORLANDC__ */
65#endif /* MS_WINDOWS */
66#endif /* !__WATCOMC__ || __QNX__ */
67
68#if defined(MS_WINDOWS) && !defined(__BORLANDC__)
69/* Win32 has better clock replacement; we have our own version below. */
70#undef HAVE_CLOCK
71#endif /* MS_WINDOWS && !defined(__BORLANDC__) */
72
73#if defined(PYOS_OS2)
74#define INCL_DOS
75#define INCL_ERRORS
76#include <os2.h>
77#endif
78
79#if defined(PYCC_VACPP)
80#include <sys/time.h>
81#endif
82
83#ifdef __BEOS__
84#include <time.h>
85/* For bigtime_t, snooze(). - [cjh] */
86#include <support/SupportDefs.h>
87#include <kernel/OS.h>
88#endif
89
90#ifdef RISCOS
91extern int riscos_sleep(double);
92#endif
93
94/* Forward declarations */
95static int floatsleep(double);
96static double floattime(void);
97
98/* For Y2K check */
99static PyObject *moddict = NULL;
100
101/* Exposed in timefuncs.h. */
102time_t
103_PyTime_DoubleToTimet(double x)
104{
105 time_t result;
106 double diff;
107
108 result = (time_t)x;
109 /* How much info did we lose? time_t may be an integral or
110 * floating type, and we don't know which. If it's integral,
111 * we don't know whether C truncates, rounds, returns the floor,
112 * etc. If we lost a second or more, the C rounding is
113 * unreasonable, or the input just doesn't fit in a time_t;
114 * call it an error regardless. Note that the original cast to
115 * time_t can cause a C error too, but nothing we can do to
116 * worm around that.
117 */
118 diff = x - (double)result;
119 if (diff <= -1.0 || diff >= 1.0) {
120 PyErr_SetString(PyExc_ValueError,
121 "timestamp out of range for platform time_t");
122 result = (time_t)-1;
123 }
124 return result;
125}
126
127static PyObject *
128time_time(PyObject *self, PyObject *unused)
129{
130 double secs;
131 secs = floattime();
132 if (secs == 0.0) {
133 PyErr_SetFromErrno(PyExc_IOError);
134 return NULL;
135 }
136 return PyFloat_FromDouble(secs);
137}
138
139PyDoc_STRVAR(time_doc,
140"time() -> floating point number\n\
141\n\
142Return the current time in seconds since the Epoch.\n\
143Fractions of a second may be present if the system clock provides them.");
144
145#ifdef HAVE_CLOCK
146
147#ifndef CLOCKS_PER_SEC
148#ifdef CLK_TCK
149#define CLOCKS_PER_SEC CLK_TCK
150#else
151#define CLOCKS_PER_SEC 1000000
152#endif
153#endif
154
155static PyObject *
156time_clock(PyObject *self, PyObject *unused)
157{
158 return PyFloat_FromDouble(((double)clock()) / CLOCKS_PER_SEC);
159}
160#endif /* HAVE_CLOCK */
161
162#if defined(MS_WINDOWS) && !defined(__BORLANDC__)
163/* Due to Mark Hammond and Tim Peters */
164static PyObject *
165time_clock(PyObject *self, PyObject *unused)
166{
167 static LARGE_INTEGER ctrStart;
168 static double divisor = 0.0;
169 LARGE_INTEGER now;
170 double diff;
171
172 if (divisor == 0.0) {
173 LARGE_INTEGER freq;
174 QueryPerformanceCounter(&ctrStart);
175 if (!QueryPerformanceFrequency(&freq) || freq.QuadPart == 0) {
176 /* Unlikely to happen - this works on all intel
177 machines at least! Revert to clock() */
178 return PyFloat_FromDouble(((double)clock()) /
179 CLOCKS_PER_SEC);
180 }
181 divisor = (double)freq.QuadPart;
182 }
183 QueryPerformanceCounter(&now);
184 diff = (double)(now.QuadPart - ctrStart.QuadPart);
185 return PyFloat_FromDouble(diff / divisor);
186}
187
188#define HAVE_CLOCK /* So it gets included in the methods */
189#endif /* MS_WINDOWS && !defined(__BORLANDC__) */
190
191#ifdef HAVE_CLOCK
192PyDoc_STRVAR(clock_doc,
193"clock() -> floating point number\n\
194\n\
195Return the CPU time or real time since the start of the process or since\n\
196the first call to clock(). This has as much precision as the system\n\
197records.");
198#endif
199
200static PyObject *
201time_sleep(PyObject *self, PyObject *args)
202{
203 double secs;
204 if (!PyArg_ParseTuple(args, "d:sleep", &secs))
205 return NULL;
206 if (floatsleep(secs) != 0)
207 return NULL;
208 Py_INCREF(Py_None);
209 return Py_None;
210}
211
212PyDoc_STRVAR(sleep_doc,
213"sleep(seconds)\n\
214\n\
215Delay execution for a given number of seconds. The argument may be\n\
216a floating point number for subsecond precision.");
217
218static PyStructSequence_Field struct_time_type_fields[] = {
219 {"tm_year", "year, for example, 1993"},
220 {"tm_mon", "month of year, range [1, 12]"},
221 {"tm_mday", "day of month, range [1, 31]"},
222 {"tm_hour", "hours, range [0, 23]"},
223 {"tm_min", "minutes, range [0, 59]"},
224 {"tm_sec", "seconds, range [0, 61])"},
225 {"tm_wday", "day of week, range [0, 6], Monday is 0"},
226 {"tm_yday", "day of year, range [1, 366]"},
227 {"tm_isdst", "1 if summer time is in effect, 0 if not, and -1 if unknown"},
228 {0}
229};
230
231static PyStructSequence_Desc struct_time_type_desc = {
232 "time.struct_time",
233 "The time value as returned by gmtime(), localtime(), and strptime(), and\n"
234 " accepted by asctime(), mktime() and strftime(). May be considered as a\n"
235 " sequence of 9 integers.\n\n"
236 " Note that several fields' values are not the same as those defined by\n"
237 " the C language standard for struct tm. For example, the value of the\n"
238 " field tm_year is the actual year, not year - 1900. See individual\n"
239 " fields' descriptions for details.",
240 struct_time_type_fields,
241 9,
242};
243
244static int initialized;
245static PyTypeObject StructTimeType;
246
247static PyObject *
248tmtotuple(struct tm *p)
249{
250 PyObject *v = PyStructSequence_New(&StructTimeType);
251 if (v == NULL)
252 return NULL;
253
254#define SET(i,val) PyStructSequence_SET_ITEM(v, i, PyInt_FromLong((long) val))
255
256 SET(0, p->tm_year + 1900);
257 SET(1, p->tm_mon + 1); /* Want January == 1 */
258 SET(2, p->tm_mday);
259 SET(3, p->tm_hour);
260 SET(4, p->tm_min);
261 SET(5, p->tm_sec);
262 SET(6, (p->tm_wday + 6) % 7); /* Want Monday == 0 */
263 SET(7, p->tm_yday + 1); /* Want January, 1 == 1 */
264 SET(8, p->tm_isdst);
265#undef SET
266 if (PyErr_Occurred()) {
267 Py_XDECREF(v);
268 return NULL;
269 }
270
271 return v;
272}
273
274static PyObject *
275time_convert(double when, struct tm * (*function)(const time_t *))
276{
277 struct tm *p;
278 time_t whent = _PyTime_DoubleToTimet(when);
279
280 if (whent == (time_t)-1 && PyErr_Occurred())
281 return NULL;
282 errno = 0;
283 p = function(&whent);
284 if (p == NULL) {
285#ifdef EINVAL
286 if (errno == 0)
287 errno = EINVAL;
288#endif
289 return PyErr_SetFromErrno(PyExc_ValueError);
290 }
291 return tmtotuple(p);
292}
293
294/* Parse arg tuple that can contain an optional float-or-None value;
295 format needs to be "|O:name".
296 Returns non-zero on success (parallels PyArg_ParseTuple).
297*/
298static int
299parse_time_double_args(PyObject *args, char *format, double *pwhen)
300{
301 PyObject *ot = NULL;
302
303 if (!PyArg_ParseTuple(args, format, &ot))
304 return 0;
305 if (ot == NULL || ot == Py_None)
306 *pwhen = floattime();
307 else {
308 double when = PyFloat_AsDouble(ot);
309 if (PyErr_Occurred())
310 return 0;
311 *pwhen = when;
312 }
313 return 1;
314}
315
316static PyObject *
317time_gmtime(PyObject *self, PyObject *args)
318{
319 double when;
320 if (!parse_time_double_args(args, "|O:gmtime", &when))
321 return NULL;
322 return time_convert(when, gmtime);
323}
324
325PyDoc_STRVAR(gmtime_doc,
326"gmtime([seconds]) -> (tm_year, tm_mon, tm_mday, tm_hour, tm_min,\n\
327 tm_sec, tm_wday, tm_yday, tm_isdst)\n\
328\n\
329Convert seconds since the Epoch to a time tuple expressing UTC (a.k.a.\n\
330GMT). When 'seconds' is not passed in, convert the current time instead.");
331
332static PyObject *
333time_localtime(PyObject *self, PyObject *args)
334{
335 double when;
336 if (!parse_time_double_args(args, "|O:localtime", &when))
337 return NULL;
338 return time_convert(when, localtime);
339}
340
341PyDoc_STRVAR(localtime_doc,
342"localtime([seconds]) -> (tm_year,tm_mon,tm_mday,tm_hour,tm_min,\n\
343 tm_sec,tm_wday,tm_yday,tm_isdst)\n\
344\n\
345Convert seconds since the Epoch to a time tuple expressing local time.\n\
346When 'seconds' is not passed in, convert the current time instead.");
347
348static int
349gettmarg(PyObject *args, struct tm *p)
350{
351 int y;
352 memset((void *) p, '\0', sizeof(struct tm));
353
354 if (!PyArg_Parse(args, "(iiiiiiiii)",
355 &y,
356 &p->tm_mon,
357 &p->tm_mday,
358 &p->tm_hour,
359 &p->tm_min,
360 &p->tm_sec,
361 &p->tm_wday,
362 &p->tm_yday,
363 &p->tm_isdst))
364 return 0;
365 if (y < 1900) {
366 PyObject *accept = PyDict_GetItemString(moddict,
367 "accept2dyear");
368 if (accept == NULL || !PyInt_Check(accept) ||
369 PyInt_AsLong(accept) == 0) {
370 PyErr_SetString(PyExc_ValueError,
371 "year >= 1900 required");
372 return 0;
373 }
374 if (69 <= y && y <= 99)
375 y += 1900;
376 else if (0 <= y && y <= 68)
377 y += 2000;
378 else {
379 PyErr_SetString(PyExc_ValueError,
380 "year out of range");
381 return 0;
382 }
383 }
384 p->tm_year = y - 1900;
385 p->tm_mon--;
386 p->tm_wday = (p->tm_wday + 1) % 7;
387 p->tm_yday--;
388 return 1;
389}
390
391#ifdef HAVE_STRFTIME
392static PyObject *
393time_strftime(PyObject *self, PyObject *args)
394{
395 PyObject *tup = NULL;
396 struct tm buf;
397 const char *fmt;
398 size_t fmtlen, buflen;
399 char *outbuf = 0;
400 size_t i;
401
402 memset((void *) &buf, '\0', sizeof(buf));
403
404 if (!PyArg_ParseTuple(args, "s|O:strftime", &fmt, &tup))
405 return NULL;
406
407 if (tup == NULL) {
408 time_t tt = time(NULL);
409 buf = *localtime(&tt);
410 } else if (!gettmarg(tup, &buf))
411 return NULL;
412
413 /* Checks added to make sure strftime() does not crash Python by
414 indexing blindly into some array for a textual representation
415 by some bad index (fixes bug #897625).
416
417 Also support values of zero from Python code for arguments in which
418 that is out of range by forcing that value to the lowest value that
419 is valid (fixed bug #1520914).
420
421 Valid ranges based on what is allowed in struct tm:
422
423 - tm_year: [0, max(int)] (1)
424 - tm_mon: [0, 11] (2)
425 - tm_mday: [1, 31]
426 - tm_hour: [0, 23]
427 - tm_min: [0, 59]
428 - tm_sec: [0, 60]
429 - tm_wday: [0, 6] (1)
430 - tm_yday: [0, 365] (2)
431 - tm_isdst: [-max(int), max(int)]
432
433 (1) gettmarg() handles bounds-checking.
434 (2) Python's acceptable range is one greater than the range in C,
435 thus need to check against automatic decrement by gettmarg().
436 */
437 if (buf.tm_mon == -1)
438 buf.tm_mon = 0;
439 else if (buf.tm_mon < 0 || buf.tm_mon > 11) {
440 PyErr_SetString(PyExc_ValueError, "month out of range");
441 return NULL;
442 }
443 if (buf.tm_mday == 0)
444 buf.tm_mday = 1;
445 else if (buf.tm_mday < 0 || buf.tm_mday > 31) {
446 PyErr_SetString(PyExc_ValueError, "day of month out of range");
447 return NULL;
448 }
449 if (buf.tm_hour < 0 || buf.tm_hour > 23) {
450 PyErr_SetString(PyExc_ValueError, "hour out of range");
451 return NULL;
452 }
453 if (buf.tm_min < 0 || buf.tm_min > 59) {
454 PyErr_SetString(PyExc_ValueError, "minute out of range");
455 return NULL;
456 }
457 if (buf.tm_sec < 0 || buf.tm_sec > 61) {
458 PyErr_SetString(PyExc_ValueError, "seconds out of range");
459 return NULL;
460 }
461 /* tm_wday does not need checking of its upper-bound since taking
462 ``% 7`` in gettmarg() automatically restricts the range. */
463 if (buf.tm_wday < 0) {
464 PyErr_SetString(PyExc_ValueError, "day of week out of range");
465 return NULL;
466 }
467 if (buf.tm_yday == -1)
468 buf.tm_yday = 0;
469 else if (buf.tm_yday < 0 || buf.tm_yday > 365) {
470 PyErr_SetString(PyExc_ValueError, "day of year out of range");
471 return NULL;
472 }
473 /* Normalize tm_isdst just in case someone foolishly implements %Z
474 based on the assumption that tm_isdst falls within the range of
475 [-1, 1] */
476 if (buf.tm_isdst < -1)
477 buf.tm_isdst = -1;
478 else if (buf.tm_isdst > 1)
479 buf.tm_isdst = 1;
480
481#ifdef MS_WINDOWS
482 /* check that the format string contains only valid directives */
483 for(outbuf = strchr(fmt, '%');
484 outbuf != NULL;
485 outbuf = strchr(outbuf+2, '%'))
486 {
487 if (outbuf[1]=='#')
488 ++outbuf; /* not documented by python, */
489 if (outbuf[1]=='\0' ||
490 !strchr("aAbBcdHIjmMpSUwWxXyYzZ%", outbuf[1]))
491 {
492 PyErr_SetString(PyExc_ValueError, "Invalid format string");
493 return 0;
494 }
495 }
496#endif
497
498 fmtlen = strlen(fmt);
499
500 /* I hate these functions that presume you know how big the output
501 * will be ahead of time...
502 */
503 for (i = 1024; ; i += i) {
504 outbuf = (char *)malloc(i);
505 if (outbuf == NULL) {
506 return PyErr_NoMemory();
507 }
508 buflen = strftime(outbuf, i, fmt, &buf);
509 if (buflen > 0 || i >= 256 * fmtlen) {
510 /* If the buffer is 256 times as long as the format,
511 it's probably not failing for lack of room!
512 More likely, the format yields an empty result,
513 e.g. an empty format, or %Z when the timezone
514 is unknown. */
515 PyObject *ret;
516 ret = PyString_FromStringAndSize(outbuf, buflen);
517 free(outbuf);
518 return ret;
519 }
520 free(outbuf);
521#if defined _MSC_VER && _MSC_VER >= 1400 && defined(__STDC_SECURE_LIB__)
522 /* VisualStudio .NET 2005 does this properly */
523 if (buflen == 0 && errno == EINVAL) {
524 PyErr_SetString(PyExc_ValueError, "Invalid format string");
525 return 0;
526 }
527#endif
528
529 }
530}
531
532PyDoc_STRVAR(strftime_doc,
533"strftime(format[, tuple]) -> string\n\
534\n\
535Convert a time tuple to a string according to a format specification.\n\
536See the library reference manual for formatting codes. When the time tuple\n\
537is not present, current time as returned by localtime() is used.");
538#endif /* HAVE_STRFTIME */
539
540static PyObject *
541time_strptime(PyObject *self, PyObject *args)
542{
543 PyObject *strptime_module = PyImport_ImportModuleNoBlock("_strptime");
544 PyObject *strptime_result;
545
546 if (!strptime_module)
547 return NULL;
548 strptime_result = PyObject_CallMethod(strptime_module,
549 "_strptime_time", "O", args);
550 Py_DECREF(strptime_module);
551 return strptime_result;
552}
553
554PyDoc_STRVAR(strptime_doc,
555"strptime(string, format) -> struct_time\n\
556\n\
557Parse a string to a time tuple according to a format specification.\n\
558See the library reference manual for formatting codes (same as strftime()).");
559
560
561static PyObject *
562time_asctime(PyObject *self, PyObject *args)
563{
564 PyObject *tup = NULL;
565 struct tm buf;
566 char *p;
567 if (!PyArg_UnpackTuple(args, "asctime", 0, 1, &tup))
568 return NULL;
569 if (tup == NULL) {
570 time_t tt = time(NULL);
571 buf = *localtime(&tt);
572 } else if (!gettmarg(tup, &buf))
573 return NULL;
574 p = asctime(&buf);
575 if (p == NULL) {
576 PyErr_SetString(PyExc_ValueError, "invalid time");
577 return NULL;
578 }
579 if (p[24] == '\n')
580 p[24] = '\0';
581 return PyString_FromString(p);
582}
583
584PyDoc_STRVAR(asctime_doc,
585"asctime([tuple]) -> string\n\
586\n\
587Convert a time tuple to a string, e.g. 'Sat Jun 06 16:26:11 1998'.\n\
588When the time tuple is not present, current time as returned by localtime()\n\
589is used.");
590
591static PyObject *
592time_ctime(PyObject *self, PyObject *args)
593{
594 PyObject *ot = NULL;
595 time_t tt;
596 char *p;
597
598 if (!PyArg_UnpackTuple(args, "ctime", 0, 1, &ot))
599 return NULL;
600 if (ot == NULL || ot == Py_None)
601 tt = time(NULL);
602 else {
603 double dt = PyFloat_AsDouble(ot);
604 if (PyErr_Occurred())
605 return NULL;
606 tt = _PyTime_DoubleToTimet(dt);
607 if (tt == (time_t)-1 && PyErr_Occurred())
608 return NULL;
609 }
610 p = ctime(&tt);
611 if (p == NULL) {
612 PyErr_SetString(PyExc_ValueError, "unconvertible time");
613 return NULL;
614 }
615 if (p[24] == '\n')
616 p[24] = '\0';
617 return PyString_FromString(p);
618}
619
620PyDoc_STRVAR(ctime_doc,
621"ctime(seconds) -> string\n\
622\n\
623Convert a time in seconds since the Epoch to a string in local time.\n\
624This is equivalent to asctime(localtime(seconds)). When the time tuple is\n\
625not present, current time as returned by localtime() is used.");
626
627#ifdef HAVE_MKTIME
628static PyObject *
629time_mktime(PyObject *self, PyObject *tup)
630{
631 struct tm buf;
632 time_t tt;
633 if (!gettmarg(tup, &buf))
634 return NULL;
635 buf.tm_wday = -1; /* sentinel; original value ignored */
636 tt = mktime(&buf);
637 /* Return value of -1 does not necessarily mean an error, but tm_wday
638 * cannot remain set to -1 if mktime succeeded. */
639 if (tt == (time_t)(-1) && buf.tm_wday == -1) {
640 PyErr_SetString(PyExc_OverflowError,
641 "mktime argument out of range");
642 return NULL;
643 }
644 return PyFloat_FromDouble((double)tt);
645}
646
647PyDoc_STRVAR(mktime_doc,
648"mktime(tuple) -> floating point number\n\
649\n\
650Convert a time tuple in local time to seconds since the Epoch.");
651#endif /* HAVE_MKTIME */
652
653#ifdef HAVE_WORKING_TZSET
654static void inittimezone(PyObject *module);
655
656static PyObject *
657time_tzset(PyObject *self, PyObject *unused)
658{
659 PyObject* m;
660
661 m = PyImport_ImportModuleNoBlock("time");
662 if (m == NULL) {
663 return NULL;
664 }
665
666 tzset();
667
668 /* Reset timezone, altzone, daylight and tzname */
669 inittimezone(m);
670 Py_DECREF(m);
671
672 Py_INCREF(Py_None);
673 return Py_None;
674}
675
676PyDoc_STRVAR(tzset_doc,
677"tzset()\n\
678\n\
679Initialize, or reinitialize, the local timezone to the value stored in\n\
680os.environ['TZ']. The TZ environment variable should be specified in\n\
681standard Unix timezone format as documented in the tzset man page\n\
682(eg. 'US/Eastern', 'Europe/Amsterdam'). Unknown timezones will silently\n\
683fall back to UTC. If the TZ environment variable is not set, the local\n\
684timezone is set to the systems best guess of wallclock time.\n\
685Changing the TZ environment variable without calling tzset *may* change\n\
686the local timezone used by methods such as localtime, but this behaviour\n\
687should not be relied on.");
688#endif /* HAVE_WORKING_TZSET */
689
690static void
691inittimezone(PyObject *m) {
692 /* This code moved from inittime wholesale to allow calling it from
693 time_tzset. In the future, some parts of it can be moved back
694 (for platforms that don't HAVE_WORKING_TZSET, when we know what they
695 are), and the extraneous calls to tzset(3) should be removed.
696 I haven't done this yet, as I don't want to change this code as
697 little as possible when introducing the time.tzset and time.tzsetwall
698 methods. This should simply be a method of doing the following once,
699 at the top of this function and removing the call to tzset() from
700 time_tzset():
701
702 #ifdef HAVE_TZSET
703 tzset()
704 #endif
705
706 And I'm lazy and hate C so nyer.
707 */
708#if defined(HAVE_TZNAME) && !defined(__GLIBC__) && !defined(__CYGWIN__)
709 tzset();
710#ifdef PYOS_OS2
711 PyModule_AddIntConstant(m, "timezone", _timezone);
712#else /* !PYOS_OS2 */
713 PyModule_AddIntConstant(m, "timezone", timezone);
714#endif /* PYOS_OS2 */
715#ifdef HAVE_ALTZONE
716 PyModule_AddIntConstant(m, "altzone", altzone);
717#else
718#ifdef PYOS_OS2
719 PyModule_AddIntConstant(m, "altzone", _timezone-3600);
720#else /* !PYOS_OS2 */
721 PyModule_AddIntConstant(m, "altzone", timezone-3600);
722#endif /* PYOS_OS2 */
723#endif
724 PyModule_AddIntConstant(m, "daylight", daylight);
725 PyModule_AddObject(m, "tzname",
726 Py_BuildValue("(zz)", tzname[0], tzname[1]));
727#else /* !HAVE_TZNAME || __GLIBC__ || __CYGWIN__*/
728#ifdef HAVE_STRUCT_TM_TM_ZONE
729 {
730#define YEAR ((time_t)((365 * 24 + 6) * 3600))
731 time_t t;
732 struct tm *p;
733 long janzone, julyzone;
734 char janname[10], julyname[10];
735 t = (time((time_t *)0) / YEAR) * YEAR;
736 p = localtime(&t);
737 janzone = -p->tm_gmtoff;
738 strncpy(janname, p->tm_zone ? p->tm_zone : " ", 9);
739 janname[9] = '\0';
740 t += YEAR/2;
741 p = localtime(&t);
742 julyzone = -p->tm_gmtoff;
743 strncpy(julyname, p->tm_zone ? p->tm_zone : " ", 9);
744 julyname[9] = '\0';
745
746 if( janzone < julyzone ) {
747 /* DST is reversed in the southern hemisphere */
748 PyModule_AddIntConstant(m, "timezone", julyzone);
749 PyModule_AddIntConstant(m, "altzone", janzone);
750 PyModule_AddIntConstant(m, "daylight",
751 janzone != julyzone);
752 PyModule_AddObject(m, "tzname",
753 Py_BuildValue("(zz)",
754 julyname, janname));
755 } else {
756 PyModule_AddIntConstant(m, "timezone", janzone);
757 PyModule_AddIntConstant(m, "altzone", julyzone);
758 PyModule_AddIntConstant(m, "daylight",
759 janzone != julyzone);
760 PyModule_AddObject(m, "tzname",
761 Py_BuildValue("(zz)",
762 janname, julyname));
763 }
764 }
765#else
766#endif /* HAVE_STRUCT_TM_TM_ZONE */
767#ifdef __CYGWIN__
768 tzset();
769 PyModule_AddIntConstant(m, "timezone", _timezone);
770 PyModule_AddIntConstant(m, "altzone", _timezone-3600);
771 PyModule_AddIntConstant(m, "daylight", _daylight);
772 PyModule_AddObject(m, "tzname",
773 Py_BuildValue("(zz)", _tzname[0], _tzname[1]));
774#endif /* __CYGWIN__ */
775#endif /* !HAVE_TZNAME || __GLIBC__ || __CYGWIN__*/
776}
777
778
779static PyMethodDef time_methods[] = {
780 {"time", time_time, METH_NOARGS, time_doc},
781#ifdef HAVE_CLOCK
782 {"clock", time_clock, METH_NOARGS, clock_doc},
783#endif
784 {"sleep", time_sleep, METH_VARARGS, sleep_doc},
785 {"gmtime", time_gmtime, METH_VARARGS, gmtime_doc},
786 {"localtime", time_localtime, METH_VARARGS, localtime_doc},
787 {"asctime", time_asctime, METH_VARARGS, asctime_doc},
788 {"ctime", time_ctime, METH_VARARGS, ctime_doc},
789#ifdef HAVE_MKTIME
790 {"mktime", time_mktime, METH_O, mktime_doc},
791#endif
792#ifdef HAVE_STRFTIME
793 {"strftime", time_strftime, METH_VARARGS, strftime_doc},
794#endif
795 {"strptime", time_strptime, METH_VARARGS, strptime_doc},
796#ifdef HAVE_WORKING_TZSET
797 {"tzset", time_tzset, METH_NOARGS, tzset_doc},
798#endif
799 {NULL, NULL} /* sentinel */
800};
801
802
803PyDoc_STRVAR(module_doc,
804"This module provides various functions to manipulate time values.\n\
805\n\
806There are two standard representations of time. One is the number\n\
807of seconds since the Epoch, in UTC (a.k.a. GMT). It may be an integer\n\
808or a floating point number (to represent fractions of seconds).\n\
809The Epoch is system-defined; on Unix, it is generally January 1st, 1970.\n\
810The actual value can be retrieved by calling gmtime(0).\n\
811\n\
812The other representation is a tuple of 9 integers giving local time.\n\
813The tuple items are:\n\
814 year (four digits, e.g. 1998)\n\
815 month (1-12)\n\
816 day (1-31)\n\
817 hours (0-23)\n\
818 minutes (0-59)\n\
819 seconds (0-59)\n\
820 weekday (0-6, Monday is 0)\n\
821 Julian day (day in the year, 1-366)\n\
822 DST (Daylight Savings Time) flag (-1, 0 or 1)\n\
823If the DST flag is 0, the time is given in the regular time zone;\n\
824if it is 1, the time is given in the DST time zone;\n\
825if it is -1, mktime() should guess based on the date and time.\n\
826\n\
827Variables:\n\
828\n\
829timezone -- difference in seconds between UTC and local standard time\n\
830altzone -- difference in seconds between UTC and local DST time\n\
831daylight -- whether local time should reflect DST\n\
832tzname -- tuple of (standard time zone name, DST time zone name)\n\
833\n\
834Functions:\n\
835\n\
836time() -- return current time in seconds since the Epoch as a float\n\
837clock() -- return CPU time since process start as a float\n\
838sleep() -- delay for a number of seconds given as a float\n\
839gmtime() -- convert seconds since Epoch to UTC tuple\n\
840localtime() -- convert seconds since Epoch to local time tuple\n\
841asctime() -- convert time tuple to string\n\
842ctime() -- convert time in seconds to string\n\
843mktime() -- convert local time tuple to seconds since Epoch\n\
844strftime() -- convert time tuple to string according to format specification\n\
845strptime() -- parse string to time tuple according to format specification\n\
846tzset() -- change the local timezone");
847
848
849PyMODINIT_FUNC
850inittime(void)
851{
852 PyObject *m;
853 char *p;
854 m = Py_InitModule3("time", time_methods, module_doc);
855 if (m == NULL)
856 return;
857
858 /* Accept 2-digit dates unless PYTHONY2K is set and non-empty */
859 p = Py_GETENV("PYTHONY2K");
860 PyModule_AddIntConstant(m, "accept2dyear", (long) (!p || !*p));
861 /* If an embedded interpreter is shutdown and reinitialized the old
862 moddict was not decrefed on shutdown and the next import of this
863 module leads to a leak. Conditionally decref here to prevent that.
864 */
865 Py_XDECREF(moddict);
866 /* Squirrel away the module's dictionary for the y2k check */
867 moddict = PyModule_GetDict(m);
868 Py_INCREF(moddict);
869
870 /* Set, or reset, module variables like time.timezone */
871 inittimezone(m);
872
873#ifdef MS_WINDOWS
874 /* Helper to allow interrupts for Windows.
875 If Ctrl+C event delivered while not sleeping
876 it will be ignored.
877 */
878 main_thread = PyThread_get_thread_ident();
879 hInterruptEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
880 SetConsoleCtrlHandler( PyCtrlHandler, TRUE);
881#endif /* MS_WINDOWS */
882 if (!initialized) {
883 PyStructSequence_InitType(&StructTimeType,
884 &struct_time_type_desc);
885 }
886 Py_INCREF(&StructTimeType);
887 PyModule_AddObject(m, "struct_time", (PyObject*) &StructTimeType);
888 initialized = 1;
889}
890
891
892/* Implement floattime() for various platforms */
893
894static double
895floattime(void)
896{
897 /* There are three ways to get the time:
898 (1) gettimeofday() -- resolution in microseconds
899 (2) ftime() -- resolution in milliseconds
900 (3) time() -- resolution in seconds
901 In all cases the return value is a float in seconds.
902 Since on some systems (e.g. SCO ODT 3.0) gettimeofday() may
903 fail, so we fall back on ftime() or time().
904 Note: clock resolution does not imply clock accuracy! */
905#ifdef HAVE_GETTIMEOFDAY
906 {
907 struct timeval t;
908#ifdef GETTIMEOFDAY_NO_TZ
909 if (gettimeofday(&t) == 0)
910 return (double)t.tv_sec + t.tv_usec*0.000001;
911#else /* !GETTIMEOFDAY_NO_TZ */
912 if (gettimeofday(&t, (struct timezone *)NULL) == 0)
913 return (double)t.tv_sec + t.tv_usec*0.000001;
914#endif /* !GETTIMEOFDAY_NO_TZ */
915 }
916
917#endif /* !HAVE_GETTIMEOFDAY */
918 {
919#if defined(HAVE_FTIME)
920 struct timeb t;
921 ftime(&t);
922 return (double)t.time + (double)t.millitm * (double)0.001;
923#else /* !HAVE_FTIME */
924 time_t secs;
925 time(&secs);
926 return (double)secs;
927#endif /* !HAVE_FTIME */
928 }
929}
930
931
932/* Implement floatsleep() for various platforms.
933 When interrupted (or when another error occurs), return -1 and
934 set an exception; else return 0. */
935
936static int
937floatsleep(double secs)
938{
939/* XXX Should test for MS_WINDOWS first! */
940#if defined(HAVE_SELECT) && !defined(__BEOS__) && !defined(__EMX__)
941 struct timeval t;
942 double frac;
943 frac = fmod(secs, 1.0);
944 secs = floor(secs);
945 t.tv_sec = (long)secs;
946 t.tv_usec = (long)(frac*1000000.0);
947 Py_BEGIN_ALLOW_THREADS
948 if (select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &t) != 0) {
949#ifdef EINTR
950 if (errno != EINTR) {
951#else
952 if (1) {
953#endif
954 Py_BLOCK_THREADS
955 PyErr_SetFromErrno(PyExc_IOError);
956 return -1;
957 }
958 }
959 Py_END_ALLOW_THREADS
960#elif defined(__WATCOMC__) && !defined(__QNX__)
961 /* XXX Can't interrupt this sleep */
962 Py_BEGIN_ALLOW_THREADS
963 delay((int)(secs * 1000 + 0.5)); /* delay() uses milliseconds */
964 Py_END_ALLOW_THREADS
965#elif defined(MS_WINDOWS)
966 {
967 double millisecs = secs * 1000.0;
968 unsigned long ul_millis;
969
970 if (millisecs > (double)ULONG_MAX) {
971 PyErr_SetString(PyExc_OverflowError,
972 "sleep length is too large");
973 return -1;
974 }
975 Py_BEGIN_ALLOW_THREADS
976 /* Allow sleep(0) to maintain win32 semantics, and as decreed
977 * by Guido, only the main thread can be interrupted.
978 */
979 ul_millis = (unsigned long)millisecs;
980 if (ul_millis == 0 ||
981 main_thread != PyThread_get_thread_ident())
982 Sleep(ul_millis);
983 else {
984 DWORD rc;
985 ResetEvent(hInterruptEvent);
986 rc = WaitForSingleObject(hInterruptEvent, ul_millis);
987 if (rc == WAIT_OBJECT_0) {
988 /* Yield to make sure real Python signal
989 * handler called.
990 */
991 Sleep(1);
992 Py_BLOCK_THREADS
993 errno = EINTR;
994 PyErr_SetFromErrno(PyExc_IOError);
995 return -1;
996 }
997 }
998 Py_END_ALLOW_THREADS
999 }
1000#elif defined(PYOS_OS2)
1001 /* This Sleep *IS* Interruptable by Exceptions */
1002 Py_BEGIN_ALLOW_THREADS
1003 if (DosSleep(secs * 1000) != NO_ERROR) {
1004 Py_BLOCK_THREADS
1005 PyErr_SetFromErrno(PyExc_IOError);
1006 return -1;
1007 }
1008 Py_END_ALLOW_THREADS
1009#elif defined(__BEOS__)
1010 /* This sleep *CAN BE* interrupted. */
1011 {
1012 if( secs <= 0.0 ) {
1013 return;
1014 }
1015
1016 Py_BEGIN_ALLOW_THREADS
1017 /* BeOS snooze() is in microseconds... */
1018 if( snooze( (bigtime_t)( secs * 1000.0 * 1000.0 ) ) == B_INTERRUPTED ) {
1019 Py_BLOCK_THREADS
1020 PyErr_SetFromErrno( PyExc_IOError );
1021 return -1;
1022 }
1023 Py_END_ALLOW_THREADS
1024 }
1025#elif defined(RISCOS)
1026 if (secs <= 0.0)
1027 return 0;
1028 Py_BEGIN_ALLOW_THREADS
1029 /* This sleep *CAN BE* interrupted. */
1030 if ( riscos_sleep(secs) )
1031 return -1;
1032 Py_END_ALLOW_THREADS
1033#elif defined(PLAN9)
1034 {
1035 double millisecs = secs * 1000.0;
1036 if (millisecs > (double)LONG_MAX) {
1037 PyErr_SetString(PyExc_OverflowError, "sleep length is too large");
1038 return -1;
1039 }
1040 /* This sleep *CAN BE* interrupted. */
1041 Py_BEGIN_ALLOW_THREADS
1042 if(sleep((long)millisecs) < 0){
1043 Py_BLOCK_THREADS
1044 PyErr_SetFromErrno(PyExc_IOError);
1045 return -1;
1046 }
1047 Py_END_ALLOW_THREADS
1048 }
1049#else
1050 /* XXX Can't interrupt this sleep */
1051 Py_BEGIN_ALLOW_THREADS
1052 sleep((int)secs);
1053 Py_END_ALLOW_THREADS
1054#endif
1055
1056 return 0;
1057}
1058
1059/* export floattime to socketmodule.c */
1060PyAPI_FUNC(double)
1061_PyTime_FloatTime(void)
1062{
1063 return floattime();
1064}
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