[Bug stdio/21398] freopen does not check dup3 return value, and does not return error if dup3 fails (seen when open returns fd 0, and freopen on stdin)

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=21398

--- Comment #5 from Andreas Schwab <schwab@linux-m68k.org> ---
freopen operates on streams, not file descriptors.

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