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NAME | C SYNOPSIS | CAVEAT | DESCRIPTION | RETURN VALUES | DIAGNOSTICS | SEE ALSO | COLOPHON |
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PMCLEANMAPDIR(3) Library Functions Manual PMCLEANMAPDIR(3)
__pmCleanMapDir - remove old files from a map directory
#include "pmapi.h"
#include "libpcp.h"
int __pmCleanMapDir(const char *dirname, const char * special);
cc ... -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.
pmlogger(1) and pmie(1) maintain directories of map files that
provide a mapping from a pmlogger(1) or pmie(1) process id (PID)
to important parameters of those processes.
__pmCleanMapDir removes ``dead'' files in these directories,
specifically the directory entries in dirname should follow these
rules, else __pmCleanMapDir will remove them:
+ the name should be numeric, else it should be equal special (if
special is not NULL)
+ for a numeric directory entry it should be a regular file and
the name should be the PID of a running process
+ for a match on special the directory entry should be a symbolic
link and the last component of the link should be the ASCII
encoding of the PID of a running process
Before any of these checks are done, __pmCleanMapDir checks that
dirname is indeed a directory, and the user id and group id of
the caller match the user id and group id of dirname.
If a serious error occurs, __pmCleanMapDir returns a negative
value suitable for reporting with pmErrStr(3). Otherwise the
return value is the number of entries that have been removed.
Verbose diagnostics describing the actions of __pmCleanMapDir
will be reported on standard error of the debug option misc is
set, e.g. via -D misc from the command line.
pmdbg(1), PMAPI(3) and pmErrStr(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 [email protected]. 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
[email protected]
Performance Co-Pilot PCP PMCLEANMAPDIR(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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