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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
required.
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 versions 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
responsibility 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
return 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.
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 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 PMAREWRITEMETA(3)
Pages that refer to this page: pmarewritedata(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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