timespec_get
Defined in header <time.h>
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(since C11) | |
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(since C11) |
1) Modifies the timespec
object pointed to by ts
to hold the current calendar time in the time base base
.
2) Expands to a value suitable for use as the base
argument of timespec_get
Other macro constants beginning with TIME_
may be provided by the implementation to indicate additional time bases.
If base
is TIME_UTC
, then.
- ts->tv_sec is set to the number of seconds since an implementation defined epoch, truncated to a whole value
- ts->tv_nsec member is set to the integral number of nanoseconds, rounded to the resolution of the system clock
Parameters
ts | - | pointer to an object of type struct timespec
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base | - | TIME_UTC or another nonzero integer value indicating the time base
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Return value
The value of base
if successful, zero otherwise.
Notes
The POSIX function clock_gettime(CLOCK_REALTIME, ts) may also be used to populate a timespec
with the time since the Epoch.
Example
#include <stdio.h>
#include <time.h>
int main(void)
{
struct timespec ts;
timespec_get(&ts, TIME_UTC);
char buff[100];
strftime(buff, sizeof buff, "%D %T", gmtime(&ts.tv_sec));
printf("Current time: %s.%09ld UTC\n", buff, ts.tv_nsec);
}
Output:
Current time: 02/18/15 14:34:03.048508855 UTC
References
C11 standard (ISO/IEC 9899:2011):
- 7.27.2.5 The timespec_get function (p: 390)
See also
(since C11) |
time in seconds and nanoseconds (struct) |
returns the current calendar time of the system as time since epoch (function) |
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