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NAME | C SYNOPSIS | CAVEAT | DESCRIPTION | DIAGNOSTICS AND RETURN VALUES | SEE ALSO | COLOPHON |
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PMAREWRITEMETA(3) Library Functions Manual PMAREWRITEMETA(3)
pmaRewriteMeta - try to change the version of an archive metadata
record
#include <pcp/pmapi.h>
#include <pcp/libpcp.h>
#include <pcp/archive.h>
int pmaRewriteMeta(__pmLogCtl *inlcp, __pmLogCtl *outlcp,
__int32_t *rbuf);
cc ... -lpcp_archive -lpcp
This documentation is intended for internal Performance Co-Pilot
(PCP) developer use.
These interfaces are not part of the PCP APIs that are guaranteed
to remain fixed across releases, and they may not work, or may
provide different semantics at some point in the future.
A physical metadata record from the input archive identified by
inlcp is passed in via rbuf and this is reformatted if required to
produce the equivalent metadata record for the output archive
identified by outlcp.
Combined with the input and output archive versions, the type of
the metadata record (as extracted from rbuf) is used to decide if;
for some record types and version changes no rewriting is re‐
quired.
pmaRewriteMeta is intended to be used in cases where the archive
version of inlcp and outlcp are different. The only sane choice
of archive versions today is PM_LOG_VERS02 for inlcp and
PM_LOG_VERS03 for outlcp, which would be requesting a rewrite from
archive version 2 format to archive version 3 format (as only ver‐
sions 2 and 3 are currently supported).
If rewriting takes place the old rbuf will have been free'd and a
new rbuf allocated with malloc(3). It is the caller's responsi‐
bility to make sure this potential free-and-allocate will be safe,
e.g. no dangling references into the contents of rbuf, or pass in
a copy of the record if it is precious.
In several places, fatal errors will trigger an error message and
force the application to exit.
If there is no defined translation for the versions of inlcp and
outlcp then pmaRewriteMeta returns PM_ERR_APPVERSION (a slight
perversion of this error code).
If no rewrite is performed, the return value is 0, otherwise a re‐
turn value of 1 indicates a rewrite has taken place and rbuf has
been reallocated.
free(3), malloc(3), PMAPI(3), and pmaRewriteData(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 PCP PMAREWRITEMETA(3)
Pages that refer to this page: pmarewritedata(3)
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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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