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1e2b6882fc
On Windows, the tv_sec field of the timeval structure has the type C long, whereas it has the type C time_t on all other platforms. A C long has a size of 32 bits (signed inter, 1 bit for the sign, 31 bits for the value) which is not enough to store an Epoch timestamp after the year 2038. Add the _PyTime_AsTimevalTime_t() function written for datetime.datetime.now(): convert a _PyTime_t timestamp to a (secs, us) tuple where secs type is time_t. It allows to support dates after the year 2038 on Windows. Enhance also _PyTime_AsTimeval_impl() to detect overflow on the number of seconds when rounding the number of microseconds.
197 lines
6.6 KiB
C
197 lines
6.6 KiB
C
#ifndef Py_LIMITED_API
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#ifndef Py_PYTIME_H
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#define Py_PYTIME_H
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#include "pyconfig.h" /* include for defines */
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#include "object.h"
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/**************************************************************************
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Symbols and macros to supply platform-independent interfaces to time related
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functions and constants
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**************************************************************************/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef PY_INT64_T
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/* _PyTime_t: Python timestamp with subsecond precision. It can be used to
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store a duration, and so indirectly a date (related to another date, like
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UNIX epoch). */
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typedef PY_INT64_T _PyTime_t;
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#define _PyTime_MIN PY_LLONG_MIN
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#define _PyTime_MAX PY_LLONG_MAX
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#else
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# error "_PyTime_t need signed 64-bit integer type"
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#endif
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typedef enum {
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/* Round towards minus infinity (-inf).
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For example, used to read a clock. */
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_PyTime_ROUND_FLOOR=0,
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/* Round towards infinity (+inf).
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For example, used for timeout to wait "at least" N seconds. */
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_PyTime_ROUND_CEILING=1,
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/* Round to nearest with ties going to nearest even integer.
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For example, used to round from a Python float. */
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_PyTime_ROUND_HALF_EVEN
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} _PyTime_round_t;
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/* Convert a time_t to a PyLong. */
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PyAPI_FUNC(PyObject *) _PyLong_FromTime_t(
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time_t sec);
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/* Convert a PyLong to a time_t. */
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PyAPI_FUNC(time_t) _PyLong_AsTime_t(
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PyObject *obj);
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/* Convert a number of seconds, int or float, to time_t. */
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PyAPI_FUNC(int) _PyTime_ObjectToTime_t(
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PyObject *obj,
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time_t *sec,
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_PyTime_round_t);
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/* Convert a number of seconds, int or float, to a timeval structure.
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usec is in the range [0; 999999] and rounded towards zero.
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For example, -1.2 is converted to (-2, 800000). */
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PyAPI_FUNC(int) _PyTime_ObjectToTimeval(
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PyObject *obj,
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time_t *sec,
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long *usec,
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_PyTime_round_t);
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/* Convert a number of seconds, int or float, to a timespec structure.
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nsec is in the range [0; 999999999] and rounded towards zero.
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For example, -1.2 is converted to (-2, 800000000). */
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PyAPI_FUNC(int) _PyTime_ObjectToTimespec(
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PyObject *obj,
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time_t *sec,
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long *nsec,
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_PyTime_round_t);
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/* Create a timestamp from a number of seconds. */
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PyAPI_FUNC(_PyTime_t) _PyTime_FromSeconds(int seconds);
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/* Macro to create a timestamp from a number of seconds, no integer overflow.
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Only use the macro for small values, prefer _PyTime_FromSeconds(). */
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#define _PYTIME_FROMSECONDS(seconds) \
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((_PyTime_t)(seconds) * (1000 * 1000 * 1000))
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/* Create a timestamp from a number of nanoseconds. */
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PyAPI_FUNC(_PyTime_t) _PyTime_FromNanoseconds(PY_LONG_LONG ns);
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/* Convert a number of seconds (Python float or int) to a timetamp.
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Raise an exception and return -1 on error, return 0 on success. */
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PyAPI_FUNC(int) _PyTime_FromSecondsObject(_PyTime_t *t,
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PyObject *obj,
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_PyTime_round_t round);
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/* Convert a number of milliseconds (Python float or int, 10^-3) to a timetamp.
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Raise an exception and return -1 on error, return 0 on success. */
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PyAPI_FUNC(int) _PyTime_FromMillisecondsObject(_PyTime_t *t,
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PyObject *obj,
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_PyTime_round_t round);
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/* Convert a timestamp to a number of seconds as a C double. */
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PyAPI_FUNC(double) _PyTime_AsSecondsDouble(_PyTime_t t);
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/* Convert timestamp to a number of milliseconds (10^-3 seconds). */
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PyAPI_FUNC(_PyTime_t) _PyTime_AsMilliseconds(_PyTime_t t,
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_PyTime_round_t round);
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/* Convert timestamp to a number of microseconds (10^-6 seconds). */
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PyAPI_FUNC(_PyTime_t) _PyTime_AsMicroseconds(_PyTime_t t,
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_PyTime_round_t round);
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/* Convert timestamp to a number of nanoseconds (10^-9 seconds) as a Python int
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object. */
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PyAPI_FUNC(PyObject *) _PyTime_AsNanosecondsObject(_PyTime_t t);
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/* Convert a timestamp to a timeval structure (microsecond resolution).
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tv_usec is always positive.
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Raise an exception and return -1 if the conversion overflowed,
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return 0 on success. */
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PyAPI_FUNC(int) _PyTime_AsTimeval(_PyTime_t t,
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struct timeval *tv,
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_PyTime_round_t round);
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/* Similar to _PyTime_AsTimeval(), but don't raise an exception on error. */
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PyAPI_FUNC(int) _PyTime_AsTimeval_noraise(_PyTime_t t,
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struct timeval *tv,
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_PyTime_round_t round);
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/* Convert a timestamp to a number of seconds (secs) and microseconds (us).
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us is always positive. This function is similar to _PyTime_AsTimeval()
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except that secs is always a time_t type, whereas the timeval structure
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uses a C long for tv_sec on Windows.
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Raise an exception and return -1 if the conversion overflowed,
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return 0 on success. */
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PyAPI_FUNC(int) _PyTime_AsTimevalTime_t(
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_PyTime_t t,
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time_t *secs,
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int *us,
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_PyTime_round_t round);
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#if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_KQUEUE)
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/* Convert a timestamp to a timespec structure (nanosecond resolution).
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tv_nsec is always positive.
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Raise an exception and return -1 on error, return 0 on success. */
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PyAPI_FUNC(int) _PyTime_AsTimespec(_PyTime_t t, struct timespec *ts);
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#endif
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/* Get the current time from the system clock.
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The function cannot fail. _PyTime_Init() ensures that the system clock
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works. */
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PyAPI_FUNC(_PyTime_t) _PyTime_GetSystemClock(void);
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/* Get the time of a monotonic clock, i.e. a clock that cannot go backwards.
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The clock is not affected by system clock updates. The reference point of
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the returned value is undefined, so that only the difference between the
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results of consecutive calls is valid.
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The function cannot fail. _PyTime_Init() ensures that a monotonic clock
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is available and works. */
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PyAPI_FUNC(_PyTime_t) _PyTime_GetMonotonicClock(void);
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/* Structure used by time.get_clock_info() */
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typedef struct {
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const char *implementation;
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int monotonic;
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int adjustable;
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double resolution;
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} _Py_clock_info_t;
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/* Get the current time from the system clock.
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* Fill clock information if info is not NULL.
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* Raise an exception and return -1 on error, return 0 on success.
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*/
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PyAPI_FUNC(int) _PyTime_GetSystemClockWithInfo(
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_PyTime_t *t,
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_Py_clock_info_t *info);
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/* Get the time of a monotonic clock, i.e. a clock that cannot go backwards.
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The clock is not affected by system clock updates. The reference point of
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the returned value is undefined, so that only the difference between the
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results of consecutive calls is valid.
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Fill info (if set) with information of the function used to get the time.
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Return 0 on success, raise an exception and return -1 on error. */
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PyAPI_FUNC(int) _PyTime_GetMonotonicClockWithInfo(
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_PyTime_t *t,
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_Py_clock_info_t *info);
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/* Initialize time.
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Return 0 on success, raise an exception and return -1 on error. */
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PyAPI_FUNC(int) _PyTime_Init(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* Py_PYTIME_H */
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#endif /* Py_LIMITED_API */
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