pmnameid(3) — Linux manual page

PMNAMEID(3)              Library Functions Manual             PMNAMEID(3)

NAME         top

       pmNameID - translate a PMID to a performance metric name

C SYNOPSIS         top

       #include <pcp/pmapi.h>

       int pmNameID(pmID pmid, char **name);

       cc ... -lpcp

DESCRIPTION         top

       Given  a  Performance  Metric Identifier (PMID) via pmid, pmNameID
       will determine the corresponding metric name, if any, in the  Per‐
       formance Metrics Name Space (PMNS), and return this via name.

       If  the PMNS contains multiple names associated with the requested
       PMID, one of these will be returned via name, but there is no  way
       to  determine  which  of  the  duplicate  names this will be.  See
       pmNameAll(3) if all of the corresponding names are required.

       As of Version 3.10.3 of PCP, duplicate names for the same PMID are
       allowed in the PMNS, so using pmNameAll(3) is recommended over pm‐
       NameID.

       name is a null-byte terminated string, allocated by pmNameID using
       malloc(3) and it is the caller's responsibility to call free(3) to
       release the storage when the value is no longer required.

       In the absence of errors, pmNameID returns zero.

DIAGNOSTICS         top

       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 pmNameID
              must be made after the creation of a context (see
              pmNewContext(3)).

       PM_ERR_PMID
              pmid does not correspond to a defined PMID in the PMNS.

       PM_ERR_*
              Other diagnostics are for protocol failures when accessing
              the distributed PMNS.

SEE ALSO         top

       PMAPI(3), pmGetChildren(3), pmGetChildrenStatus(3),
       pmGetConfig(3), pmLoadASCIINameSpace(3), pmLoadNameSpace(3),
       pmLookupName(3), pmNameAll(3), pmNewContext(3), pcp.conf(5),
       pcp.env(5) and PMNS(5).

COLOPHON         top

       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
       [email protected].  This page was obtained from the project's upstream
       Git repository ⟨https://github.com/performancecopilot/pcp.git⟩ on
       2025-08-11.  (At that time, the date of the most recent commit
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       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 [email protected]

Performance Co-Pilot               PCP                        PMNAMEID(3)

Pages that refer to this page: pmapi(3),  pmdaname(3),  pmgetchildren(3),  pmgetchildrenstatus(3),  pmgetderivedcontrol(3),  pmlookupname(3),  pmnameall(3)

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