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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 involving
pmcd(1).
pmSpecLocalPMDA provides a convenience wrapper to be used by
applications that wish to use a command line argument (usually with
-K) to control the DSO PMDAs that are available for a
PM_CONTEXT_LOCAL context.
The spec argument specifies actions for one or more DSO PMDAs using
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 optional), 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 required.
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_pmda.dylib (for BSD-style platforms) or fooo_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.
Information 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
2018-02-02. (At that time, the date of the most recent commit that
was found in the repository was 2018-02-02.) 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: pcp2elasticsearch(1), pcp2graphite(1), pcp2influxdb(1), pcp2json(1), pcp2xlsx(1), pcp2xml(1), pcp2zabbix(1), pminfo(1), pmlogger(1), pmprobe(1), pmrep(1), pmstore(1), pmval(1), pmwebd(1), pmgetoptions(3), pmrep.conf(5)
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