Current File : //opt/alt/ruby32/include/ruby/internal/intern/time.h
#ifndef RBIMPL_INTERN_TIME_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_INTERN_TIME_H
/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright This file is a part of the programming language Ruby.
* Permission is hereby granted, to either redistribute and/or
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
* implementation details. Don't take them as canon. They could
* rapidly appear then vanish. The name (path) of this header file
* is also an implementation detail. Do not expect it to persist
* at the place it is now. Developers are free to move it anywhere
* anytime at will.
* @note To ruby-core: remember that this header can be possibly
* recursively included from extension libraries written in C++.
* Do not expect for instance `__VA_ARGS__` is always available.
* We assume C99 for ruby itself but we don't assume languages of
* extension libraries. They could be written in C++98.
* @brief Public APIs related to ::rb_cTime.
*/
#include "ruby/internal/config.h"
#ifdef HAVE_TIME_H
# include <time.h> /* for time_t */
#endif
#include "ruby/internal/attr/nonnull.h"
#include "ruby/internal/dllexport.h"
#include "ruby/internal/value.h"
RBIMPL_SYMBOL_EXPORT_BEGIN()
struct timespec;
struct timeval;
/* time.c */
RBIMPL_ATTR_NONNULL(())
/**
* Fills the current time into the given struct.
*
* @param[out] ts Return buffer.
* @exception rb_eSystemCallError Access denied for hardware clock.
* @post Current time is stored in `*ts`.
*/
void rb_timespec_now(struct timespec *ts);
/**
* Creates an instance of ::rb_cTime with the given time and the local
* timezone.
*
* @param[in] sec Seconds since the UNIX epoch.
* @param[in] usec Subsecond part, in microseconds resolution.
* @exception rb_eRangeError Cannot express the time.
* @return An allocated instance of ::rb_cTime.
*/
VALUE rb_time_new(time_t sec, long usec);
/**
* Identical to rb_time_new(), except it accepts the time in nanoseconds
* resolution.
*
* @param[in] sec Seconds since the UNIX epoch.
* @param[in] nsec Subsecond part, in nanoseconds resolution.
* @exception rb_eRangeError Cannot express the time.
* @return An allocated instance of ::rb_cTime.
*/
VALUE rb_time_nano_new(time_t sec, long nsec);
RBIMPL_ATTR_NONNULL(())
/**
* Creates an instance of ::rb_cTime, with given time and offset.
*
* @param[in] ts Time specifier.
* @param[in] offset Offset specifier, can take following values:
* - `INT_MAX`: `ts` is in local time.
* - `INT_MAX - 1`: `ts` is in UTC.
* - `-86400` to `86400`: fixed timezone.
* @exception rb_eArgError Malformed `offset`.
* @return An allocated instance of ::rb_cTime.
*/
VALUE rb_time_timespec_new(const struct timespec *ts, int offset);
/**
* Identical to rb_time_timespec_new(), except it takes Ruby values instead of
* C structs.
*
* @param[in] timev Something numeric. Currently Integers, Rationals,
* and Floats are accepted.
* @param[in] off Offset specifier. As of 2.7 this argument is
* heavily extended to take following kinds of
* objects:
* - ::RUBY_Qundef ... means UTC.
* - ::rb_cString ... "+12:34" etc.
* - A mysterious "zone" object. This is largely
* undocumented. However the initial intent was
* that we want to accept
* `ActiveSupport::TimeZone` here. Other gems
* could also be possible... But how to make an
* acceptable class is beyond this document.
* @exception rb_eArgError Malformed `off`.
* @return An allocated instance of ::rb_cTime.
*/
VALUE rb_time_num_new(VALUE timev, VALUE off);
/**
* Creates a "time interval". This basically converts an instance of
* ::rb_cNumeric into a struct `timeval`, but for instance negative time
* interval must not exist.
*
* @param[in] num An instance of ::rb_cNumeric.
* @exception rb_eArgError `num` is negative.
* @exception rb_eRangeError `num` is out of range of `timeval::tv_sec`.
* @return A struct that represents the identical time to `num`.
*/
struct timeval rb_time_interval(VALUE num);
/**
* Converts an instance of rb_cTime to a struct timeval that represents the
* identical point of time. It can also take something numeric; would consider
* it as a UNIX time then.
*
* @param[in] time Instance of either ::rb_cTime or ::rb_cNumeric.
* @exception rb_eRangeError `time` is out of range of `timeval::tv_sec`.
* @return A struct that represents the identical time to `num`.
*/
struct timeval rb_time_timeval(VALUE time);
/**
* Identical to rb_time_timeval(), except for return type.
*
* @param[in] time Instance of either ::rb_cTime or ::rb_cNumeric.
* @exception rb_eRangeError `time` is out of range of `timeval::tv_sec`.
* @return A struct that represents the identical time to `num`.
*/
struct timespec rb_time_timespec(VALUE time);
/**
* Identical to rb_time_interval(), except for return type.
*
* @param[in] num An instance of ::rb_cNumeric.
* @exception rb_eArgError `num` is negative.
* @exception rb_eRangeError `num` is out of range of `timespec::tv_sec`.
* @return A struct that represents the identical time to `num`.
*/
struct timespec rb_time_timespec_interval(VALUE num);
/**
* Queries the offset, in seconds between the time zone of the time and the
* UTC.
*
* @param[in] time An instance of ::rb_cTime.
* @return Numeric offset.
*/
VALUE rb_time_utc_offset(VALUE time);
RBIMPL_SYMBOL_EXPORT_END()
#endif /* RBIMPL_INTERN_TIME_H */
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