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pmdaname(3)

NAME

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

C SYNOPSIS

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

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

   cc ... -lpcp_pmda -lpcp

DESCRIPTION

   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 version.four.name  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

   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

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

SEE ALSO

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



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