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58505a8791
Make fhandler_socket_local::dup and fhandler_socket_local::fcntl (a new method) call fhandler_base::dup and fhandler_base::fcntl if O_PATH is set. We're viewing the socket as a disk file here, but there's no need to implement the actions of fhandler_disk_file::dup and fhandler_disk_file::fcntl, which do nothing useful in this case beyond what the fhandler_base methods do. (The extra actions are only useful when I/O is going to be done on the file.)
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