PMLOOKUPNAME(3)
NAME
pmLookupName, pmRequestNames, pmReceiveNames - translate performance
metric names into PMIDs
C SYNOPSIS
#include <pcp/pmapi.h>
int pmLookupName(int numpmid, char **namelist, pmID *pmidlist) int pmRequestNames(int ctx, int numpmid, char **namelist) int pmReceiveNames(int ctx, pmID *pmidlist)
cc ... -lpcp
DESCRIPTION
Given a list in namelist containing numpmid full pathnames for performance metrics from a Performance Metrics Name Space (PMNS), pmLookupName returns the list of associated Performance Metric Identifiers
(PMIDs) via pmidlist.
The result from pmLookupName will be the number of names translated in
the absence of errors, else an error code less than zero. When errors
are encountered, the corresponding value in pmidlist will be
PM_ID_NULL.
Note that the error protocol guarantees there is a 1:1 relationship between the elements of namelist and pmidlist, hence both lists contain exactly numpmid elements. For this reason, the caller is expected to have pre-allocated a suitably sized array for pmidlist.
pmRequestNames and pmReceiveNames are used by applications which must
communicate with the PMCD asynchronously. These functions take explict
context handle ctx which must refer to a host context (i.e. created by
passing PM_CONTEXT_HOST to pmNewContext). pmRequestNames sends request
to translate names to PMIDs to PMCD and returns without waiting for the
response, pmReceiveNames reads reply from PMCD. It is the responsibility of the application to make sure the data are ready before calling
pmReceiveNames to avoid blocking.
SEE ALSO
PMAPI(3), pmGetChildren(3), pmGetChildrenStatus(3), pmGetConfig(3),
pmLoadNameSpace(3), pmNameID(3), pmNewContext(3), pcp.conf(4) and
pcp.env(4).
DIAGNOSTICS
- PM_ERR_TOOSMALL
- numpmid must be at least 1
- PM_ERR_NOPMNS
- Failed to access a PMNS for operation. Note that if the application hasn't a priori called pmLoadNameSpace(3) and wants to use the distributed PMNS, then a call to pmLookupName must be made after the creation of a context (see pmNewContext(3)).
- PM_ERR_NAME
- One or more of the elements of namelist does not correspond to a valid metric name in the PMNS.
- PM_ERR_NONLEAF
- A name referred to a node in the PMNS but it was not a leaf node.
- PM_ERR_*
- Other diagnostics are for protocol failures when accessing the distributed PMNS.
- PM_ERR_CTXBUSY
- Context is currently in use by another asynchronous call.