[Twisted-Python] How to get an unused port

[Andrew Bennetts]

Gabriel Rossetti wrote:
> Hello,
>
> I need to be able to get an unused port for a server, it will then 
> communicate it to a third party.
> I don't have any restrictions other than it shouldn't be a known used port 
> (one used by other apps (above 1023)), but for that I'll probably have to 
> create a list and verify manually. Does anyone know how to do this (without 
> iterating all ports and trying), it must be possible since a client gets 
> the next unused port from the OS, I'd like to do this with Twisted if 
> possible.

Pass 0 as the port number.

-Andrew.