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pmdatext(3)

NAME

   pmdaText - extract metric help text for a PMDA

C SYNOPSIS

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

   int pmdaText(int ident, int type, char **buffer, pmdaExt *pmda);

   cc ... -lpcp_pmda -lpcp

DESCRIPTION

   As  part  of  the  Performance  Metrics  Domain  Agent  (PMDA) API (see
   PMDA(3)), pmdaText uses the standard PMDA(3) data structures to  return
   the  help  text  for  metric  ident  in  buffer.  The help text must be
   located in help text files created with newhelp(1), and the  associated
   files are automatically opened by pmdaInit(3).

   The  path  to  the  (basename of the) help text files can be set in the
   calls to pmdaDSO(3) or pmdaDaemon(3) and overridden by the  -h  command
   line option in pmdaGetOpt(3).

   The  encoding  of  ident  follows  the  internal  scheme used below the
   routines pmLookupText(3) and pmLookupInDomText(3), namely ident encodes
   either  a metric identifier or an instance domain identifier, according
   to the value of type.

   The type argument is a bit mask  that  encodes  the  interpretation  of
   ident  and  the  requested  form  of  help  text,  as  follows:  either
   PM_TEXT_PMID if ident is a metric identifier, or PM_TEXT_INDOM if ident
   is  an  instance domain identifier, plus either PM_TEXT_ONELINE for the
   one line help text or PM_TEXT_HELP for the full help text.

   The buffer is managed internally (usually it is cached), and it  should
   not be released or freed by the caller of pmdaText.

DIAGNOSTICS

   If  the requested help text could not be obtained, pmdaText will return
   PM_ERR_TEXT.

CAVEAT

   The PMDA must be using PMDA_PROTOCOL_2 or later, as  specified  in  the
   call to pmdaDSO(3) or pmdaDaemon(3).

SEE ALSO

   newhelp(1),  malloc(3),  PMAPI(3),  PMDA(3), pmdaDaemon(3), pmdaDSO(3),
   pmdaInit(3), pmLookupInDomText(3) and pmLookupText(3).



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