pmdastore3
Store a value into a metric for a pmda
Part of pmdaStore(3).
C synopsis
#include <pcp/pmapi.h>
#include <pcp/pmda.h>
int pmdaStore(pmResult *result, pmdaExt *pmda);
cc ... -lpcp_pmda -lpcp
Overview
As part of the Performance Metrics Domain Agent (PMDA) API (see PMDA(3)), pmdaStore is the generic callback for storing a value into a metric. pmdaStore is usually a no-op as, by default, no metrics can be altered. Also, the implementation of a store callback which does permit metrics to be altered by pmstore(1) is very application dependent.
Diagnostics
pmdaStore returns PM_ERR_PERMISSION to indicate that no metrics may be modified.
Caveat
The PMDA must be using PMDA_PROTOCOL_2 or later, as specified in the call to pmdaDSO(3) or pmdaDaemon(3).