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pmloadasciinamespace(3)


NAME

   pmLoadASCIINameSpace - establish a local PMNS for an application

C SYNOPSIS

   #include <pcp/pmapi.h>

   int pmLoadASCIINameSpace(const char *filename, int dupok);

   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   pmLoadASCIINameSpace   or  pmLoadNameSpace(3).   If  the
   application wants 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
   pmLoadASCIINameSpace.

   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.

   pmLoadASCIINameSpace is a variant of pmLoadNameSpace(3)  in  which  the
   dupok argument may be used to control the handling of multiple names in
   the PMNS that may  be  associated  with  a  single  Performance  Metric
   Identifier  (PMID).  A value of 0 disallows duplicates, any other value
   allows  duplicates  and  the  latter  is  the  default   behaviour   of
   pmLoadNameSpace(3) as of Version 3.10.3 of PCP.

   The  other  difference  is  that  when pmLoadASCIINameSpace is used and
   filename is not PM_NS_DEFAULT,  the  PMNS  file  will  always  be  pre-
   processed  with  pmcpp(1)  as described in pmns(5).  This allows a PMNS
   file that contains C-style comments, pre-processor directives or macros
   to be processed correctly before the PMNS is parsed.

   pmLoadASCIINameSpace 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),   pmLoadNameSpace(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 to load more than one PMNS, or to call
          either pmLoadASCIINameSpace and/or pmLoadNameSpace(3) more  than
          once.

   PM_ERR_PMNS

          Syntax error in an ASCII format PMNS.



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