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Receive a file descriptor from a L{sendmsg} message on the given C{AF_UNIX}
socket.
@param socketfd: An C{AF_UNIX} socket, attached to another process waiting
to send sockets via the ancillary data mechanism in L{send1msg}.
@param fd: C{int}
@return: a 2-tuple of (new file descriptor, description).
@rtype: 2-tuple of (C{int}, C{bytes})
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