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NAME | C SYNOPSIS | DESCRIPTION | NOTES | COMPATIBILITY | SEE ALSO | COLOPHON |
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PMTIMEVALNOW(3) Library Functions Manual PMTIMEVALNOW(3)
pmtimevalNow, pmtimevalInc, pmtimevalDec, pmtimevalAdd,
pmtimevalSub, pmtimevalToReal, pmtimevalFromReal,
pmtimevalTotimespec, pmtimevalPrint - helper routines for time
stored as a struct timeval
#include <pcp/pmapi.h>
void pmtimevalNow(struct timeval *tv);
void pmtimevalInc(struct timeval *ap, const struct timeval *bp);
void pmtimevalDec(struct timeval *ap, const struct timeval *bp);
double pmtimevalAdd(const struct timeval *ap,
const struct timeval *bp);
double pmtimevalSub(const struct timeval *ap,
const struct timeval *bp);
double pmtimevalToReal(const struct timeval *val);
void pmtimevalFromReal(double secs, struct timeval *val);
void pmtimevalTotimespec(struct timeval *tvp, struct timespec
*tsp);
void pmtimevalPrint(FILE *f, const struct timeval *tp);
cc ... -lpcp
pmtimevalNow is a platform-independent method that returns the
current system time since the Epoch in tv.
pmtimevalInc adds the time in ap to the time in bp and stores the
result in ap. Similarly pmtimevalDec subtracts the time in bp
from the time in ap and stores the result in ap.
pmtimevalAdd (and pmtimevalSub) add (and subtract) times and re‐
turn the result as a double value. The time in the ap argument is
not changed.
pmtimevalToReal converts the time in tp to an equivalent double
value. pmtimevalFromReal provides the reverse conversion, taking
the time in secs and returning the equivalent time in val.
pmtimevalTotimespec converts the struct timeval tvp into an equiv‐
alent struct timespec tsp (modulo rounding microseconds up to
nanoseconds).
pmtimevalPrint prints the timestamp from tp on the stream f in the
local time (as returned by pmLocaltime(3)) in the format
HH:MM:SS.XXX.
For variants of these interfaces using nanosecond precision and
the timespec structure, refer to pmtimespecNow(3).
Prior to PCP 7.0 the routine pmtimevalPrint was called pm‐
PrintStamp. To support PMAPI transition, the old routine can
still be used if applications are recompiled with -DPMAPI_VER‐
SION=2.
pmPrintStamp is now deprecated and compile-time support for this
routine name will be removed in a future release.
gettimeofday(2), time(2), PMAPI(3), pmLocaltime(3) and
pmtimespecNow(3).
This page is part of the PCP (Performance Co-Pilot) project. In‐
formation about the project can be found at ⟨http://www.pcp.io/⟩.
If you have a bug report for this manual page, send it to
pcp@groups.io. This page was obtained from the project's upstream
Git repository ⟨https://github.com/performancecopilot/pcp.git⟩ on
2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 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 man-pages@man7.org
Performance Co-Pilot PCP PMTIMEVALNOW(3)
Pages that refer to this page: pmtimespec(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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