pmdaName(3) — Linux manual page


PMDANAME(3)               Library Functions Manual               PMDANAME(3)

NAME         top

       pmdaName  -  translate  a PMID to a set of dynamic performance metric

C SYNOPSIS         top

       #include <pcp/pmapi.h>
       #include <pcp/pmda.h>

       int pmdaName(pmID pmid, char ***nameset, pmdaExt *pmda);

       cc ... -lpcp_pmda -lpcp

DESCRIPTION         top

       As part of the Performance Metrics Domain Agent (PMDA) API (see
       PMDA(3)), pmdaName is the generic callback for translating a pmid
       into one or more dynamic metric names (nameset).

       Because implementing dynamic performance metrics requires specific
       PMDA support, and the facility is an optional component of a PMDA
       (most PMDAs do not support dynamic performance metrics), pmdaName is
       a skeleton implementation that returns PM_ERR_NAME.

       A PMDA that supports dynamic performance metrics will provide a
       private callback that replaces pmdaName (by assignment to of the pmdaInterface structure) and implements the
       translation from a pmid to a set of dynamic performance metric names
       returned via nameset.  The behaviour, return values and memory
       allocation rules for nameset are the same as for pmNameAll(3).

DIAGNOSTICS         top

       pmdaName returns PM_ERR_PMID if the name is not recognized or cannot
       be translated, otherwise the number of metric names found (most
       commonly 1).

CAVEAT         top

       The PMDA must be using PMDA_PROTOCOL_4 or later, as specified in the
       call to pmdaDSO(3) or pmdaDaemon(3).

SEE ALSO         top

       PMAPI(3), PMDA(3), pmdaDaemon(3), pmdaDSO(3), pmdaMain(3),
       pmNameAll(3) and pmNameID(3).

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at ⟨⟩.
       If you have a bug report for this manual page, send it to  This page was obtained from the project's upstream
       Git repository ⟨⟩ on
       2020-09-18.  (At that time, the date of the most recent commit that
       was found in the repository was 2020-09-18.)  If you discover any
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       (which is not part of the original manual page), send a mail to

Performance Co-Pilot                 PCP                         PMDANAME(3)

Pages that refer to this page: pmdaGetContext(3)pmdamain(3)pmdaMain(3)pmdaSetCheckCallBack(3)pmdaSetDoneCallBack(3)pmdaSetEndContextCallBack(3)pmdaSetResultCallBack(3)