SCGIServer and unusal termination

Diez B. Roggisch deets at nospam.web.de
Tue Nov 17 18:30:05 CET 2009


Eden Kirin wrote:

> Diez B. Roggisch wrote:
> 
>>> Is there some reasonable explanation for this behaviour? Thanks in
>>> advance.
>> 
>> I can only guess that SCGIServer does something to stdout. Your code
>> isn't executed twice, so the doubling seems to come from writing it
>> twice.
> 
> Yes I know that code isn't executed twice since the value of n remains
> the same, only print lines are doubled.
> 
>> Try e.g. redirecting stdout and stderr to different files, and see if
>> things appear once in both.
> 
> Redirection of stdout:
> 
> eden at sunce:~/data/project/ScgiServer/test> python test.py 1> output.txt
> ^Ceden at sunce:~/data/project/ScgiServer/test> cat output.txt
> Starting server.
> Exception!
> Terminating server, attempt 1.
> Check n: 2.
> Starting server.
> Exception!
> Terminating server, attempt 1.
> Check n: 2.
> 
> Redirecting stderr creates an empty file. I still haven't found the
> solution.
> 

Then 

 - save a reference to sys.stdout *before* invoking the server
 - compare to it after interruption. If it has changed, you at least know
that somebody messed with it, and can beat him or whatever you see fit.

Diez



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