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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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timespec_get(3) Library Functions Manual timespec_get(3)
timespec_get, timespec_getres - ISO C interface to clock and time
functions
Standard C library (libc, -lc),
#include <time.h>
int timespec_get(struct timespec *res, int base);
int timespec_getres(struct timespec *tp, int base);
The timespec_get() function stores the current time, based on the
specified time base, in the timespec(3type) structure pointed to
by res.
The timespec_getres() function stores the resolution of times
retrieved by timespec_get() with the specified time base in the
timespec(3type) structure pointed to by tp, if tp is non-NULL.
For a particular time base, the resolution is constant for the
lifetime of the calling process.
TIME_UTC is always a supported time base, and is the only time
base supported on Linux. The time and resolution in this time
base are the same as those retrieved by
clock_gettime(CLOCK_REALTIME, res) and
clock_getres(CLOCK_REALTIME, tp), respectively. Other systems may
support additional time bases.
timespec_get() returns the nonzero base if it is a supported time
base and the current time was successfully retrieved, or 0
otherwise.
timespec_getres() returns the nonzero base if it is a supported
time base, or 0 otherwise.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ timespec_get(), timespec_getres() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
timespec_get()
TIME_UTC
C23 (though ISO C doesn't specify the time epoch),
POSIX.1-2024.
timespec_getres()
C23.
timespec_get()
TIME_UTC
C11, POSIX.1-2024, glibc 2.16, musl 1.1.10.
timespec_getres()
C23, glibc 2.34.
clock_gettime(2), clock_getres(2)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
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⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.15 2025-02-10 timespec_get(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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