pmSemStr man page

pmSemStr, pmSemStr_r — convert a performance metric semantic into a string

C Synopsis

#include <pcp/pmapi.h>

const char *pmSemStr(int sem);
char *pmSemStr_r(int sem, char *buf, int buflen);

cc ... -lpcp


Given a performance metric semantic, pmSemStr produces a terse ASCII equivalent, appropriate for use in error and diagnostic messages. The pmSemStr_r function does the same, but stores the result in a user-supplied buffer buf of length buflen, which should have room for at least 20 bytes.

The value for sem is typically extracted from a pmDesc structure, following a call to pmLookupDesc(3) for a particular performance metric.

Examples are counter (for sem equals PM_SEM_COUNTER), discrete (for sem equals PM_SEM_DISCRETE), instant (for sem equals PM_SEM_INSTANT), etc.

The string value result for pmSemStr is held in a single static buffer, so the returned value is only valid until the next call to pmSemStr.


pmSemStr returns a pointer to a static buffer and hence is not thread-safe. Multi-threaded applications should use pmSemStr_r instead.

See Also

PMAPI(3), pmAtomStr(3), pmConvScale(3), pmExtractValue(3), pmLookupDesc(3), pmPrintValue(3), pmIDStr(3), pmInDomStr(3), pmTypeStr(3) and pmUnitsStr(3).

Referenced By

pmIDStr(3), pmInDomStr(3), pmTypeStr(3), pmUnitsStr(3).

Explore man page connections for pmSemStr(3).

pmsemstr(3) is an alias of pmSemStr(3).

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