[Python-bugs-list] [ python-Bugs-805194 ] Inappropriate error received using socket timeout

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Bugs item #805194, was opened at 2003-09-12 12:56
Message generated for change (Settings changed) made by tim_one
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Category: Windows
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Popov (evgeni_popov)
>Assigned to: Nobody/Anonymous (nobody)
Summary: Inappropriate error received using socket timeout

Initial Comment:
When using the timeout option with a socket object 

(python 2.3), I don't have the same behaviour under 

Windows than under Linux / Mac.



Specifically, if trying to connect to an unopened port of 

the localhost, I get a timeout exception on Windows 

(tested under W2K Server), whereas I get a "111 - 

Connection Refused" exception on Linux and "22 - Invalid 

Argument" on Mac (OS X).



Even if the error message under Mac is not really 

appropriate (someone said to me he got the 

right 'Connection Refused' on his MAC), I think that the 

behaviour under Linux and Mac is the right one, in that it

sends (quickly) an error message and not timeouting.



Note that when using blocking socket the behaviour is 

ok under all platforms: they each return back quickly 

a "Connection refused" error message (err codes are 

different depending on the platform (61=Mac,

111=Linux, 10061=Windows)). FYI, I don't use firewall or 

similar prog on my windows box (but that should not 

matter, because it does work in blocking mode, so that 

can't be a firewall problem).



I heard that the timeout option was implemented based 

on Timothy O'Malley timeoutsocket.py. Then, maybe the 

pb can come from the usage of select in the connection 

function: select is not asked to get back exceptions in 

the returned triple, whereas I think some errors can be

returned back through this mean under Windows 

(according to Tip 25 of Jon C. Snader book's "Effective 

TCP/IP Programming"). So, by not checking the returned 

exceptions, we would miss the "connection refused" 

error and get instead the timeout error...



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