The procedures exported from guix/build/syscalls : 

network-interface-names
network-interface-flags
set-network-interface-flags
network-interface-netmask

.. and possibily a few others all take an argument called "sock" or "socket".

In the case of network-interface-names this parameter is #:optional and 
defaults to  (socket SOCK_STREAM AF_INET 0)

In all of the other procedures this argument is not optional, but so far
as I can tell, all callers pass the above expression as its value, and 
if I understand the API correctly, it's unlikely that anything else will
ever be required.

Will you accept a patch making "sock" #:optional for all parameters which
need it?



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