Modules/timemodule.c

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