[Bug 91931] fflush(3) is misleading about input streams

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https://bugzilla.kernel.org/show_bug.cgi?id=91931

--- Comment #3 from Michael Kerrisk <mtk.manpages@xxxxxxxxx> ---
(In reply to cubbi from comment #0)

> On a very minor note, fflush(3) also claims that
> "The standards do not specify the behavior for input streams"
> 
> This is no longer precisely correct; POSIX specifies behavior for seekable
> input streams to move fileno's offset to match FILE's offset and undo all
> ungetc's:
> http://pubs.opengroup.org/onlinepubs/9699919799/functions/fflush.html and
> glibc conforms to that (or tries to,
> https://sourceware.org/bugzilla/show_bug.cgi?id=5994 is still open)

Thanks. I modified the text to note that POSIX.1-2008 does add specification
for input streams.

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