Version 2 (modified by 6 years ago) (diff) | ,
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Logging
Sometimes the problem is so obvious that you will simply get the error directly from the command line or in the server log file.
Basics
Otherwise, a good first step is to start xpra from the command line and add "-d CATEGORY
" to it. The list of categories can be found with xpra -d help
.
You can also prefix the CATEGORY
with a dash "-
" to disable debug logging for it. ie:
xpra start :10 -d all,-window
Environment Variables
Each logging category can also be enabled using environment variable, which can be useful if you cannot modify the command line, or if the logging should happen very early on, or if you aren't calling the code from its normal wrappers.
Use: XPRA_CATEGORY_DEBUG=1 xpra ...
to enable debug logging for your chosen CATEGORY
.
Xpra control interface
It is also possible to enable and disable debug logging at runtime using:
xpra control :DISPLAY debug enable CATEGORY
and
xpra control :DISPLAY debug enable CATEGORY
And you can get the current list of debug loggers which:
xpra control :DISPLAY debug status
Detailed Logging
Some subsystems require special environment variables to enable logging, this is to minimize the cost of logging in performance critical paths.
For example:
- x11 event handling:
XPRA_X11_DEBUG_EVENTS="*" xpra start :10
or
XPRA_X11_DEBUG_EVENTS="EnterNotify,CreateNotify" xpra start :10
XShm
andimage
debugging code:XPRA_XSHM_DEBUG=1 xpra start :10
or
XPRA_XIMAGE_DEBUG=1 xpra start :10
Please refer to the source code for details and more up to date information.