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NAME | C SYNOPSIS | DESCRIPTION | DIAGNOSTICS | PCP ENVIRONMENT | SEE ALSO | COLOPHON |
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PMGETCHILDRENSTATUS(3) Library Functions Manual PMGETCHILDRENSTATUS(3)
pmGetChildrenStatus - return the descendent nodes of a PMNS node
and their respective status
#include <pcp/pmapi.h>
int pmGetChildrenStatus(const char *name, char ***offspring,
int **status);
cc ... -lpcp
Given a fully qualified pathname to a node in the current Perfor‐
mance 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 imme‐
diate 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 descen‐
dent 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 rel‐
ative 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(off‐
spring) 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).
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.
Environment variables with the prefix PCP_ are used to parameter‐
ize the file and directory names used by PCP. On each installa‐
tion, the file /etc/pcp.conf contains the local values for these
variables. The $PCP_CONF variable may be used to specify an al‐
ternative configuration file, as described in pcp.conf(5). Val‐
ues for these variables may be obtained programmatically using
the pmGetConfig(3) function.
PMAPI(3), pmGetChildren(3), pmGetConfig(3),
pmLoadASCIINameSpace(3), pmLoadNameSpace(3), pmLookupName(3),
pmNameID(3), pcp.conf(5), pcp.env(5) and PMNS(5).
This page is part of the PCP (Performance Co-Pilot) project. In‐
formation about the project can be found at ⟨http://www.pcp.io/⟩.
If you have a bug report for this manual page, send it to
pcp@groups.io. This page was obtained from the project's
upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2024-06-14.
(At that time, the date of the most recent commit that was found
in the repository was 2024-06-14.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
Performance Co-Pilot PCP PMGETCHILDRENSTATUS(3)
Pages that refer to this page: pmgetchildren(3), pmgetderivedcontrol(3), pmlookupname(3), pmnameall(3), pmnameid(3), pmwebapi(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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