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NAME | C SYNOPSIS | DESCRIPTION | RETURN VALUE | EXAMPLES | SEE ALSO | COLOPHON |
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PMSPECLOCALPMDA(3) Library Functions Manual PMSPECLOCALPMDA(3)
pmSpecLocalPMDA - process command-line argument for the table of
DSO PMDAs
#include "pmapi.h"
#include "libpcp.h"
char *pmSpecLocalPMDA(const char *spec);
cc ... -lpcp
For Performance Co-Pilot (PCP) applications, contexts of type
PM_CONTEXT_LOCAL are used by clients that wish to fetch metrics
directly from one or more PMDAs on the local host without involv‐
ing pmcd(1).
pmSpecLocalPMDA provides a convenience wrapper to be used by ap‐
plications that wish to use a command line argument (usually with
-K) to control the DSO PMDAs that are available for a PM_CON‐
TEXT_LOCAL context.
The spec argument specifies actions for one or more DSO PMDAs us‐
ing up to four fields separated by commas (``,''), namely:
- an opcode with one of the values add (add a new entry), del
(delete an existing entry) or clear (clear all entries from
the table).
- the PMDA's domain number
- the path to the PMDA DSO (may be absolute or relative to
the $PCP_VAR_DIR/pmdas directory and the DSO suffix is op‐
tional), and
- the name of the PMDA's initialization routine.
All fields are required to add a new entry. To delete an entry
the opcode is required plus either or both of the domain number
and path fields. To clear all entries, only the opcode is re‐
quired.
If spec is parsed successfully, then the DSO table is updated with
the extracted fields.
On success, pmSpecLocalPMDA will return NULL.
On error or failure, pmSpecLocalPMDA will return a pointer to a
static error message.
Some examples of valid spec strings:
clear Delete all entries from the DSO table.
add,123,foo/foo_pmda,foo_init
Add the ``foo'' PMDA using domain 123. The PMDA's DSO is
most likely in below the directory $PCP_PMDAS_DIR and named
foo/foo_pmda.so (for ELF-style platforms) or foo/foo_pm‐
da.dylib (for BSD-style platforms) or foo\foo_pmda.dll (for
Windows-style platforms). The initialization routine for
the ``foo'' PMDA is foo_init().
del,123
Delete the entry for the DSO with domain 123.
del,,foo/foo_pmda
Delete the entry with a pathname to the DSO that matches
foo/foo_pmda.
del,123,foo/foo_pmda
Delete the entry for the DSO with either domain 123 and/or
a pathname to the DSO that matches foo/foo_pmda.
pmcd(1), PMAPI(3) and pmNewContext(3).
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
2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 2025-08-11.) 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 PMSPECLOCALPMDA(3)
Pages that refer to this page: pcp2arrow(1), pcp2elasticsearch(1), pcp2graphite(1), pcp2influxdb(1), pcp2json(1), pcp2openmetrics(1), pcp2spark(1), pcp2template(1), pcp2xlsx(1), pcp2xml(1), pcp2zabbix(1), pmchart(1), pminfo(1), pmlogger(1), pmprobe(1), pmrep(1), pmstat(1), pmstore(1), pmval(1), pmgetoptions(3), __pmlocalpmda(3), pmnewcontext(3), pmrep.conf(5)
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HTML rendering created 2025-09-06 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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