I didn't have time to read and understand that puzzle, but for further enlightenment perhaps you could look at the POSIX spec for how file descriptors and streams interact <http://www.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_05.html#tag_02_05_01> and then, if glibc seems to violate that spec, please let glibc-bugs know what the problem is, by showing exactly where the violation is.
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