Question about feof()

[Guy Harris]

>    Could someone out there in net-land explain the reason for the 
> following behaviour?
> 
>    If I change the "r" to a "w", then I get a surprise.  The call to
> feof() now returns a 0.  Why is that?

Because it never read from "/dev/null", and hence didn't know that it was at
the end of the file.  What did you *expect* it to do?  Unfortunately,
"_filbuf" merely returns EOF if you try to read from something that wasn't
open for reading; it doesn't set the error indication, so "ferror" won't
tell you that you goofed.