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   pmgetchildrenstatus    ( 3 )

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Имя (Name)

pmGetChildrenStatus - return the descendent nodes of a PMNS node
       and their respective status

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Синопсис C (C Synopsis)

#include <pcp/pmapi.h>

       int pmGetChildrenStatus(const char *name, char ***offspring,
               int **status);

       cc ... -lpcp

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Описание (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(3),
       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 undefined (no space will have been allocated and so calling
       free(3) is a singularly bad idea).

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Диагностика (Diagnostic)

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.

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Окружение PCP (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.

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Смотри также (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).

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