[Twisted-Python] What is backlog?

[Andreas Kostyrka]

Just guessing it's the parameter that gets passed to the listen system
call. And that again tells the kernel how many connections to allow to
backlog.

Citing the listen manpage on Linux:

       The  backlog  argument  defines  the  maximum length to which the
queue of pending connections for sockd may grow.  If a connection
request arrives when the queue is full, the client may receive an
       error with an indication of ECONNREFUSED or, if the underlying
protocol supports retransmission, the request may be ignored so that a
later reattempt at connection succeeds.

Andreas

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