timespec_get, _timespec32_get, _timespec64_get

아티클
06/05/2017

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The latest version of this topic can be found at timespec_get, _timespec32_get, _timespec64_get1.

Sets the interval pointed to by the first argument to the current calendar time, based on the specified time base.

Syntax

int timespec_get(  
    struct timespec* const time_spec,  
    int const base  
);  
int _timespec32_get(  
    struct _timespec32* const time_spec,  
    int const base  
);  
int _timespec64_get(  
    struct _timespec64* const time_spec,  
    int const base  
);

Parameters

time_spec
Pointer to a struct that is set to the time in seconds and nanoseconds since the start of the epoch.

base
A non-zero implementation-specific value that specifies the time base.

Return Value

The value of base if successful, otherwise it returns zero.

Remarks

The timespec_get functions set the current time in the struct pointed to by the time_spec argument. All versions of this struct have two members, tv_sec and tv_nsec. The tv_sec value is set to the whole number of seconds and tv_nsec to the integral number of nanoseconds, rounded to the resolution of the system clock, since the start of the epoch specified by base.

Microsoft Specific

These functions support only TIME_UTC as the base value. This sets the time_spec value to the number of seconds and nanoseconds since the epoch start, Midnight, January 1, 1970, Coordinated Universal Time (UTC). In a struct _timespec32, tv_sec is a __time32_t value. In a struct _timespec64, tv_sec is a __time64_t value. In a struct timespec, tv_sec is a time_t type, which is 32 bits or 64 bits in length depending on whether the preprocessor macro _USE_32BIT_TIME_T is defined. The timespec_get function is an inline function that calls _timespec32_get if _USE_32BIT_TIME_T is defined; otherwise it calls _timespec64_get.

End Microsoft Specific

Requirements

Routine	Required header
`timespec_get`, `_timespec32_get`, `_timespec64_get`	C: <time.h>, C++: <ctime> or <time.h>

For additional compatibility information, see Compatibility.

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