mirror of https://github.com/python/cpython
123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
#include "Python.h"
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#ifdef MS_WINDOWS
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#include <windows.h>
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#endif
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#if defined(__APPLE__) && defined(HAVE_GETTIMEOFDAY) && defined(HAVE_FTIME)
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/*
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* _PyTime_gettimeofday falls back to ftime when getttimeofday fails because the latter
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* might fail on some platforms. This fallback is unwanted on MacOSX because
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* that makes it impossible to use a binary build on OSX 10.4 on earlier
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* releases of the OS. Therefore claim we don't support ftime.
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*/
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# undef HAVE_FTIME
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#endif
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#if defined(HAVE_FTIME) && !defined(MS_WINDOWS)
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#include <sys/timeb.h>
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extern int ftime(struct timeb *);
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#endif
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void
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_PyTime_gettimeofday(_PyTime_timeval *tp)
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{
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#ifdef MS_WINDOWS
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FILETIME system_time;
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ULARGE_INTEGER large;
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ULONGLONG microseconds;
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GetSystemTimeAsFileTime(&system_time);
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large.u.LowPart = system_time.dwLowDateTime;
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large.u.HighPart = system_time.dwHighDateTime;
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/* 11,644,473,600,000,000: number of microseconds between
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the 1st january 1601 and the 1st january 1970 (369 years + 89 leap
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days). */
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microseconds = large.QuadPart / 10 - 11644473600000000;
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tp->tv_sec = microseconds / 1000000;
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tp->tv_usec = microseconds % 1000000;
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#else
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/* There are three ways to get the time:
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(1) gettimeofday() -- resolution in microseconds
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(2) ftime() -- resolution in milliseconds
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(3) time() -- resolution in seconds
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In all cases the return value in a timeval struct.
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Since on some systems (e.g. SCO ODT 3.0) gettimeofday() may
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fail, so we fall back on ftime() or time().
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Note: clock resolution does not imply clock accuracy! */
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#ifdef HAVE_GETTIMEOFDAY
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#ifdef GETTIMEOFDAY_NO_TZ
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if (gettimeofday(tp) == 0)
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return;
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#else /* !GETTIMEOFDAY_NO_TZ */
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if (gettimeofday(tp, (struct timezone *)NULL) == 0)
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return;
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#endif /* !GETTIMEOFDAY_NO_TZ */
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#endif /* !HAVE_GETTIMEOFDAY */
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#if defined(HAVE_FTIME)
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{
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struct timeb t;
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ftime(&t);
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tp->tv_sec = t.time;
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tp->tv_usec = t.millitm * 1000;
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}
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#else /* !HAVE_FTIME */
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tp->tv_sec = time(NULL);
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tp->tv_usec = 0;
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#endif /* !HAVE_FTIME */
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#endif /* MS_WINDOWS */
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}
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int
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_PyTime_ObjectToTimespec(PyObject *obj, time_t *sec, long *nsec)
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{
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if (PyFloat_Check(obj)) {
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double d, intpart, floatpart, err;
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d = PyFloat_AsDouble(obj);
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floatpart = modf(d, &intpart);
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if (floatpart < 0) {
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floatpart = 1.0 + floatpart;
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intpart -= 1.0;
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}
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*sec = (time_t)intpart;
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err = intpart - (double)*sec;
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if (err <= -1.0 || err >= 1.0)
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goto overflow;
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floatpart *= 1e9;
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*nsec = (long)floatpart;
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return 0;
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}
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else {
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#if defined(HAVE_LONG_LONG) && SIZEOF_TIME_T == SIZEOF_LONG_LONG
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*sec = PyLong_AsLongLong(obj);
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#else
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assert(sizeof(time_t) <= sizeof(long));
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*sec = PyLong_AsLong(obj);
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#endif
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if (*sec == -1 && PyErr_Occurred()) {
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if (PyErr_ExceptionMatches(PyExc_OverflowError))
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goto overflow;
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else
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return -1;
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}
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*nsec = 0;
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return 0;
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}
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overflow:
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PyErr_SetString(PyExc_OverflowError,
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"timestamp out of range for platform time_t");
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return -1;
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}
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void
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_PyTime_Init()
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{
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/* Do nothing. Needed to force linking. */
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}
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