pmtimeval(3) — Linux manual page

NAME | C SYNOPSIS | DESCRIPTION | SEE ALSO | COLOPHON

PMTIMEVALNOW(3)         Library Functions Manual         PMTIMEVALNOW(3)

NAME         top

       pmtimevalNow, pmtimevalInc, pmtimevalDec, pmtimevalAdd,
       pmtimevalSub, pmtimevalToReal, pmtimevalFromReal, pmPrintStamp,
       pmPrintHighResStamp - helper routines for time stored as a struct
       timeval

C SYNOPSIS         top

       #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 pmPrintStamp(FILE *f, const struct timeval *tp);
       void pmPrintHighResStamp(FILE *f, const struct timespec *tp);

       cc ... -lpcp

DESCRIPTION         top

       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
       return 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.

       pmPrintStamp 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.  pmPrintHighResStamp performs a similar service,
       but for a struct timespec and reports the timestamp to nanosecond
       precision.

SEE ALSO         top

       gettimeofday(2), time(2), PMAPI(3) and pmLocaltime(3).

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at 
       ⟨http://www.pcp.io/⟩.  If you have a bug report for this manual
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Performance Co-Pilot               PCP                   PMTIMEVALNOW(3)