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[Bug stdio/20677] perror() changes orientation of stream when it is redirected


https://sourceware.org/bugzilla/show_bug.cgi?id=20677

--- Comment #6 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Igor Liferenko from comment #5)

> What is your opinion about this patch?

See comment 2.  You cannot assume stderr is backed by a POSIX file descriptor.

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