Jean-Paul Calderone <exar...@twistedmatrix.com> added the comment:

> Furthermore, python's socket documentation makes it clear:

Why does CPython go out of its way to make it impossible to pass 0 to the 
platform listen() API?  The part of the specification you quoted makes it very 
clear that 0 is a valid value for this argument.  And 0 seems to have a very 
different meaning than 1, but for some reason CPython thinks that 1 is a better 
thing for 0 to mean.

Perhaps there is a real reason someone thought to add this check in 
sock_listen, but if not, I think it's worth considering removing this check.

Unfortunately the commit message for the revision which added this check 
(r3880) is not informative:

sock_listen: ensure backlog argument is at least1

> If you really want to only accept 1 connection (I'm talking of sending back a 
> SYN-ACK, not an accept() call), you can just close the server socket

This makes perfect sense, though, and is good advice in general.

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<http://bugs.python.org/issue8498>
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