pmSemStr_r3

C synopsis

#include <pcp/pmapi.h>

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

cc ... -lpcp

Overview

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.

Notes

Both of these routines are safe to call from threaded applications.