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pmloadnamespace(3)


NAME

   pmLoadNameSpace - load a local PMNS for an application

C SYNOPSIS

   #include <pcp/pmapi.h>

   int pmLoadNameSpace(const char *filename);

   cc ... -lpcp

DESCRIPTION

   If  the  application  wants  to force using a local Performance Metrics
   Name Space (PMNS) instead of a distributed PMNS then it must  load  the
   PMNS   using   pmLoadNameSpace   or  pmLoadASCIINameSpace(3).   If  the
   application is to use a distributed PMNS, then it  should  NOT  make  a
   call to load the PMNS explicitly.

   Most  applications  using a Performance Metrics Application Programming
   Interface  (PMAPI)  context  (of  any  type,  so   PM_CONTEXT_HOST   or
   PM_CONTEXT_ARCHIVE   or  PM_CONTEXT_LOCAL)  should  not  need  to  call
   pmLoadNameSpace.

   The  filename  argument  designates  the   PMNS   of   interest.    For
   applications   not   requiring  a  tailored  PMNS,  the  special  value
   PM_NS_DEFAULT may be used for filename, to force the default local PMNS
   to be loaded.

   The  default  local  PMNS  is  found in the file $PCP_VAR_DIR/pmns/root
   unless the environment variable PMNS_DEFAULT is set, in which case  the
   value  is assumed to be the pathname to the file containing the default
   local PMNS.

   Externally a PMNS is stored in an ASCII format as described in pmns(5).
   However,  note  that  pmLoadNameSpace assumes filename does not contain
   any C-style comments, pre-processor directives or macros;  if  this  is
   not the case, pmLoadASCIINameSpace(3) should be used instead.

   As of Version 3.10.3 of PCP, by default, multiple names in the PMNS are
   allowed to be associated with a single Performance  Metrics  Identifier
   (PMID)   and   this  is  unconditionally  allowed  by  pmLoadNameSpace.
   pmLoadASCIINameSpace(3) provides an alternative  interface  with  user-
   defined  control over the handling of duplicate names for the same PMID
   in the PMNS.

   pmLoadNameSpace returns zero on success.

FILES

   $PCP_VAR_DIR/pmns/root   the default local PMNS, when  the  environment
                            variable PMNS_DEFAULT is unset

PCP ENVIRONMENT

   Environment variables with the prefix PCP_ are used to parameterize the
   file and directory names used by PCP.  On each installation,  the  file
   /etc/pcp.conf  contains  the  local  values  for  these variables.  The
   $PCP_CONF variable may be used to specify an alternative  configuration
   file,  as  described in pcp.conf(5).  Values for these variables may be
   obtained programmatically using the pmGetConfig(3) function.

SEE ALSO

   PMAPI(3), pmGetConfig(3), pmLoadASCIINameSpace(3),  pmTrimNameSpace(3),
   pcp.conf(5), pcp.env(5) and pmns(5).

DIAGNOSTICS

   Syntax  and  other  errors  in  the parsing of the PMNS are reported on
   stderr with a message of the form ``Error Parsing ASCII PMNS: ...''.

   PM_ERR_DUPPMNS

          It is an error to try and load more than one PMNS,  or  to  call
          either  pmLoadNameSpace and/or pmLoadASCIINameSpace(3) more than
          once.

   PM_ERR_PMNS

          Syntax error in the PMNS file.



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