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NAME | C SYNOPSIS | DESCRIPTION | DIAGNOSTICS | CAVEAT | SEE ALSO | COLOPHON |
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PMDADSO(3) Library Functions Manual PMDADSO(3)
pmdaDSO - initialize the PMDA to run as a DSO
#include <pcp/pmapi.h>
#include <pcp/pmda.h>
int pmdaDSO(pmdaInterface *dispatch, int interface, char *name,
char *helptext);
cc ... -lpcp_pmda -lpcp
pmdaDSO initializes the pmdaInterface structure to use the interface
extensions, assuming the PMDA(3) is to be run as a DSO. The
pmdaInterface structure is initialized with:
name The name of the agent.
helptext The default path to the help text (see pmdaText(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, so the storage
associated with helptext may be released after the
call to pmdaDSO.
The callbacks are initialized to pmdaProfile(3), pmdaFetch(3),
pmdaDesc(3), pmdaText(3), pmdaInstance(3) and pmdaStore(3).
The interface structure also contains the domain of the PMDA(3),
which is defined in the pmcd(1) configuration file. The domain is
used to initialize the metric and instance descriptors (see
pmdaInit(3)).
Incompatible version of pmcd detected
When pmcd(1) creates the pmdaInterface structure, the
dispatch.comm.version field is set to the highest
protocol that pmcd(1) understands. This message
indicates that the pmcd(1) process does not understand
the protocol used by pmdaDSO.
Unable to allocate memory for pmdaExt structure
In addition, dispatch->status is set to a value less
than zero.
The PMDA must be using PMDA_INTERFACE_2 or later.
Once pmdaDSO has been called, it is expected that the pmdaInterface
structure pointed to by dispatch will remain accessible to the
routines in libpcp_pmda (not reclaimed off the stack, not freed or
oherwise released, etc.). If the caller needs to move or relocate
the pmdaInterface structure for any reason, then after the move
pmdaInterfaceMoved(3) must be called to resestablish the internal
integrity of the pmdaInterface structure at the new location before
any other routine in libpcp_pmda is called.
pmcd(1), PMAPI(3), PMDA(3), pmdaDaemon(3), pmdaInit(3),
pmdaInterfaceMoved(3) and pmdaText(3).
This page is part of the PCP (Performance Co-Pilot) project.
Information 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
2018-02-02. (At that time, the date of the most recent commit that
was found in the repository was 2018-02-02.) 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 PMDADSO(3)
Pages that refer to this page: pmda(3), pmdaattribute(3), pmdachildren(3), pmdadaemon(3), pmdadesc(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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