pmdadaemon(3) — Linux manual page

PMDADAEMON(3)           Library Functions Manual           PMDADAEMON(3)

NAME

       pmdaDaemon - initialize the PMDA to run as a daemon

C SYNOPSIS

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

       void pmdaDaemon(pmdaInterface *dispatch, int interface, const
               char *name, int domain, const char *logfile, const
               char *helptext);

       cc ... -lpcp_pmda -lpcp

DESCRIPTION

       pmdaDaemon initializes the pmdaInterface structure to use the in‐
       terface extensions assuming the PMDA(3) is to be run as a daemon.
       The pmdaInterface structure is initialized with:

       name   The name of the agent.

       domain The default domain number of the agent which uniquely
              identifies this PMDA from other running PMDAs.  This may
              be subsequently changed by a command line option -d (see
              pmdaGetOpt(3)).

       logfile
              The default path to the log file.  This may be replaced by
              the -l command line option if using pmdaGetOpt.  logfile
              will be copied with strdup(3), so the storage associated
              with logfile may be released after the call to pmdaDaemon.

       helptext
              The default path to the help text (see pmdaText(3).  This
              may be replaced by the -h command line option if using
              pmdaGetOpt(3).  If no help text is installed, or you are
              not using pmdaText(3), then this should be set to NULL,
              otherwise helptext will be copied with strdup(3), so the
              storage associated with helptext may be released after the
              call to pmdaDaemon.

       The callbacks are initialized to pmdaProfile(3), pmdaFetch(3),
       pmdaDesc(3), pmdaText(3), pmdaInstance(3) and pmdaStore(3).

CAVEAT

       The PMDA must be using PMDA_INTERFACE_2 or later.

       Once pmdaDaemon has been called, it is expected that the pmdaIn‐
       terface structure pointed to by dispatch will remain accessible
       to the routines in libpcp_pmda (not reclaimed off the stack, not
       freed or otherwise released, etc.).  If the caller needs to move
       or relocate the pmdaInterface structure for any reason, then af‐
       ter the move pmdaInterfaceMoved(3) must be called to re-establish
       the internal integrity of the pmdaInterface structure at the new
       location before any other routine in libpcp_pmda is called.

DIAGNOSTICS

       Unable to allocate memory for pmdaExt structure
              In addition, the dispatch->status field is set to a value
              less than zero.

       PMDA interface version interface not supported
              The interface version is not supported by pmdaDaemon.

SEE ALSO

       PMAPI(3), PMDA(3), pmdaDSO(3), pmdaGetOpt(3),
       pmdaInterfaceMoved(3) and pmdaText(3).

COLOPHON

       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 2024-06-14.
       (At that time, the date of the most recent commit that was found
       in the repository was 2024-06-14.)  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                     PMDADAEMON(3)

Pages that refer to this page: pmda(3), pmdaattribute(3), pmdachildren(3), pmdaconnect(3), pmdadesc(3), pmdadso(3), pmdafetch(3), pmdagetoptions(3), pmdahelp(3), pmdainit(3), pmdainstance(3), pmdainterfacemoved(3), pmdalabel(3), pmdaname(3), pmdaopenlog(3), pmdapmid(3), pmdaprofile(3), pmdastore(3), pmdatext(3)

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