Code review comment for lp:~alan-griffiths/mir/some-acceptance-tests-use-mir-Server-API

27 + auto open_client_socket() -> int;
Given the api, I'd assume that I own the returned fd after calling this function, but it would be a bit more clear if it returned a mir::Fd.

Otherwise, I'm persuaded that this can solve help solve the endpoint-on-filesystem and think its useful.