R. David Murray added the comment: Antoine already answered that question: it does not make sense to have a single stream that is open for *update* if it is not seekable. The fact C conflates "update" with "both read and write" can be seen as a design bug in C :) The remaining question might be: is there a sensible way (that fits with the design of the IO system) to hook BufferedRWPair up to open?
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