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(defun local-addr (family port)
(caseql family
(af-inet (new sockaddr-in addr inaddr-loopback port port))
(af-inet6 (new sockaddr-in6 addr in6addr-loopback port port))))
(defun bindfree (sock from to)
(for ((port from))
((<= port to) (error "unable to bind socket"))
((inc port))
(let ((addr (local-addr (sock-family sock) port)))
(when (ignerr (sock-bind sock addr))
(sock-listen sock)
(return-from bindfree addr)))))
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