|
NAME | C SYNOPSIS | DESCRIPTION | SEE ALSO | COLOPHON |
PMOPENLOG(3) Library Functions Manual PMOPENLOG(3)
pmOpenLog - create a log file for diagnostics and debug output
#include <pcp/pmapi.h>
FILE *pmOpenLog(const char *progname, const char *logname,
FILE *oldstream, int *status);
cc ... -lpcp
pmOpenLog reassigns the standard I/O stream oldstream (normally
stderr) to be associated with the file logname. If logname is not
"-" and already exists, it will be removed and recreated if possible
(to ensure correct ownership and permissions from the caller to
pmOpenLog).
As a special case, if logname is "-" then no removal or reopening is
performed and the function simply sets status to 1 and returns
oldstream. This is useful when the caller wants diagnostics on
oldstream stream (normally stderr) rather than a file, e.g. pmlogger
-l- or pmcd -f -l-. Logging to stderr is also useful for PMDAs in a
containerized environment where it is beneficial for all PMDA logs to
be written to pmcd's stderr stream (and thus to a single
destination), whether that is a file such as pmcd.log or the original
stream inherited from the shell.
On return, the function value is the standard I/O stream, possibly
replacing oldstream. In the event of an error, the return value will
be oldstream unchanged and status will be 0.
For success, status is 1, and a standard preamble is written to
logname
Log for progname on hostname started date and time
and an atexit(3) handler is installed to write the postscript message
to logname
Log finished date and time
when the processes exits.
progname is only used to annotate messages.
atexit(3) and freopen(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
2020-08-13. (At that time, the date of the most recent commit that
was found in the repository was 2020-08-11.) 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 PMOPENLOG(3)
Pages that refer to this page: pmnotifyerr(3) , pmNotifyErr(3) , pmSyslog(3)