Unix socket binding - Errno::EADDRINUSE

[kingp0dd]

Originally found in Puma:
puma/puma#1521

Offending code in Ruby:
https://bugs.ruby-lang.org/issues/16277

require 'socket'

path = File.expand_path('listen.sock')
backlog = 5

s = UNIXServer.new(path)
if backlog
  s.listen backlog
else
  s.listen
end

File.delete(path) if File.exists?(path)

Listening twice does not throw Errno::EADDRINUSE in Linux but it does in WSL.

[therealkenc]

Spiritually #2915 (TCP over there).