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pmdadso(3)

NAME

   pmdaDSO - initialize the PMDA to run as a DSO

C SYNOPSIS

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

   int pmdaDSO(pmdaInterface *dispatch, int interface, char *name,
           char *helptext);

   cc ... -lpcp_pmda -lpcp

DESCRIPTION

   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.

   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)).

DIAGNOSTICS

   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.

CAVEAT

   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.

SEE ALSO

   pmcd(1),     PMAPI(3),     PMDA(3),     pmdaDaemon(3),     pmdaInit(3),
   pmdaInterfaceMoved(3) and pmdaText(3).



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