pmloadnamespace(3) [centos man page]
PMLOADNAMESPACE(3) Library Functions Manual 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. 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). By default, multiple names in the PMNS are not allowed to be associated with a single Performance Metrics Identifier (PMID). pmLoadASCI- INameSpace(3) provides an alternative interface with user-defined control over the processing of duplicate PMIDs 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 configura- tion 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. Performance Co-Pilot PCP PMLOADNAMESPACE(3)
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PMGETCHILDRENSTATUS(3) Library Functions Manual PMGETCHILDRENSTATUS(3) NAME
pmGetChildrenStatus - return the descendent nodes of a PMNS node and their respective status C SYNOPSIS
#include <pcp/pmapi.h> int pmGetChildrenStatus(const char *name, char ***offspring, int **status); cc ... -lpcp DESCRIPTION
Given a fully qualified pathname to a node in the current Performance Metrics Name Space (PMNS), as identified by name, pmGetChildrenStatus returns via offspring a list of the relative names of all of the immediate descendent nodes of name in the current PMNS. As a special case, if name is an empty string (i.e.""), the immediate descendants of the root node in the PMNS will be returned. If status is not NULL, then pmGetChildrenStatus will also return the status of each child via status. The status will refer to either a leaf node (with value PMNS_LEAF_STATUS ) or a non-leaf node (with value PMNS_NONLEAF_STATUS ). Normally, pmGetChildrenStatus will return the number of descendent names discovered, else a value less than zero for an error. The value zero indicates that name is a valid metric name, i.e. is associated with a leaf node in the PMNS. The resulting list of pointers offspring and the values (the relative names) that the pointers reference will have been allocated by pmGetChildrenStatus with a single call to malloc(3C), and it is the responsibility of the pmGetChildrenStatus caller to free(offspring) to release the space when it is no longer required. The same holds true for the status array. When an error occurs, or name is a leaf node (i.e. the result of pmGetChildrenStatus is less than one), both offspring and status are unde- fined (no space will have been allocated, and so calling free(3C) is a singularly bad idea). 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 configura- tion file, as described in pcp.conf(5). Values for these variables may be obtained programmatically using the pmGetConfig(3) function. SEE ALSO
PMAPI(3), pmGetChildren(3), pmGetConfig(3), pmLoadASCIINameSpace(3), pmLoadNameSpace(3), pmLookupName(3), pmNameID(3), pcp.conf(5), pcp.env(5) and pmns(5). DIAGNOSTICS
PM_ERR_NOPMNS Failed to access a PMNS for operation. Note that if the application hasn't a priori called pmLoadNameSpace(3) and wants to use the distributed PMNS, then a call to pmGetChildrenStatus must be made inside a current context. PM_ERR_NAME The pathname name is not valid in the current PMNS PM_ERR_* Other diagnostics are for protocol failures when accessing the distributed PMNS. Performance Co-Pilot PCP PMGETCHILDRENSTATUS(3)