NAME

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

C SYNOPSIS

       #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);

       cc ... -lpcp

DESCRIPTION

       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.

NOTES

       For variants of these interfaces using nanosecond precision and  the  timespec  structure,
       refer to pmtimespecNow(3).

SEE ALSO

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