pmdaText(3) — Linux manual page


PMDATEXT(3)               Library Functions Manual               PMDATEXT(3)

NAME         top

       pmdaText - extract metric help text for a PMDA

C SYNOPSIS         top

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

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

       cc ... -lpcp_pmda -lpcp

DESCRIPTION         top

       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         top

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

CAVEAT         top

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

SEE ALSO         top

       newhelp(1), malloc(3), PMAPI(3), PMDA(3), pmdaDaemon(3), pmdaDSO(3),
       pmdaInit(3), pmLookupInDomText(3) and pmLookupText(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
       rendering problems in this HTML version of the page, or you believe
       there is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

Performance Co-Pilot                 PCP                         PMDATEXT(3)

Pages that refer to this page: pmda(3)PMDA(3)pmdaCloseHelp(3)pmdadaemon(3)pmdaDaemon(3)pmdadso(3)pmdaDSO(3)pmdaExtGetData(3)pmdaExtSetData(3)pmdaExtSetFlags(3)pmdaGetContext(3)pmdaGetHelp(3)pmdaGetInDomHelp(3)pmdaGetOpt(3)pmdagetoptions(3)pmdaGetOptions(3)pmdahelp(3)pmdainit(3)pmdaInit(3)pmdamain(3)pmdaMain(3)pmdaOpenHelp(3)pmdaRehash(3)pmdaSetCheckCallBack(3)pmdaSetCommFlags(3)pmdaSetData(3)pmdaSetDoneCallBack(3)pmdaSetEndContextCallBack(3)pmdaSetFlags(3)pmdaSetResultCallBack(3)