Antoine Pitrou added the comment: Closing a socket whose fd has already been closed before is a bug waiting to happen. Indeed it feels harmless if you just get a EBADF, but if the given fd gets reused in the meantime for another file or socket, your close() method is going to close a resource which doesn't belong to the socket (and then the fd can be reused for yet another resource without its owner knowing, and confusion/hilarity ensues).
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