1PMTIMEVALNOW(3) Library Functions Manual PMTIMEVALNOW(3)
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6 pmtimevalNow, pmtimevalInc, pmtimevalDec, pmtimevalAdd, pmtimevalSub,
7 pmtimevalToReal, pmtimevalFromReal, pmPrintStamp - helper routines for
8 time stored as a struct timeval
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11 #include <pcp/pmapi.h>
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13 void pmtimevalNow(struct timeval *tv);
14 void pmtimevalInc(struct timeval *ap, const struct timeval *bp);
15 void pmtimevalDec(struct timeval *ap, const struct timeval *bp);
16 double pmtimevalAdd(const struct timeval *ap, const struct timeval
17 *bp);
18 double pmtimevalSub(const struct timeval *ap, const struct timeval
19 *bp);
20 double pmtimevalToReal(const struct timeval *val);
21 void pmtimevalFromReal(double secs, struct timeval *val);
22 void pmPrintStamp(FILE *f, const struct timeval *tp);
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24 cc ... -lpcp
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27 pmtimevalNow is a platform-independent method that returns the current
28 system time since the Epoch in tv.
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30 pmtimevalInc adds the time in ap to the time in bp and stores the re‐
31 sult in ap. Similarly pmtimevalDec subtracts the time in bp from the
32 time in ap and stores the result in ap.
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34 pmtimevalAdd (and pmtimevalSub) add (and subtract) times and return the
35 result as a double value. The time in the ap argument is not changed.
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37 pmtimevalToReal converts the time in tp to an equivalent double value.
38 pmtimevalFromReal provides the reverse conversion, taking the time in
39 secs and returning the equivalent time in val.
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41 pmPrintStamp prints the timestamp from tp on the stream f in the local
42 time (as returned by pmLocaltime(3)) in the format HH:MM:SS.XXX.
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45 For variants of these interfaces using nanosecond precision and the
46 timespec structure, refer to pmtimespecNow(3).
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49 gettimeofday(2), time(2), PMAPI(3), pmLocaltime(3) and pmtimespec‐
50 Now(3).
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54Performance Co-Pilot PCP PMTIMEVALNOW(3)