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NAME | C SYNOPSIS | DESCRIPTION | CAVEAT | DIAGNOSTICS | SEE ALSO | COLOPHON |
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PMDATEXT(3) Library Functions Manual PMDATEXT(3)
pmdaText - extract metric help text for a PMDA
#include <pcp/pmapi.h>
#include <pcp/pmda.h>
int pmdaText(int ident, int type, char **buffer, pmdaExt *pmda);
cc ... -lpcp_pmda -lpcp
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 identifi‐
er, 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_ONE‐
LINE 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.
The PMDA must be using PMDA_INTERFACE_2 or later, as specified in
the call to pmdaDSO(3) or pmdaDaemon(3).
If the requested help text could not be obtained, pmdaText will
return PM_ERR_TEXT.
newhelp(1), malloc(3), PMAPI(3), PMDA(3), pmdaDaemon(3),
pmdaDSO(3), pmdaInit(3), pmLookupInDomText(3) and pmLookupText(3).
This page is part of the PCP (Performance Co-Pilot) project. In‐
formation about the project can be found at ⟨http://www.pcp.io/⟩.
If you have a bug report for this manual page, send it to
pcp@groups.io. This page was obtained from the project's upstream
Git repository ⟨https://github.com/performancecopilot/pcp.git⟩ on
2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 2025-08-11.) 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 man-pages@man7.org
Performance Co-Pilot PCP PMDATEXT(3)
Pages that refer to this page: pmda(3), pmdadaemon(3), pmdadso(3), pmdagetoptions(3), pmdahelp(3), pmdainit(3), pmdamain(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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