What's wrong with just always doing the stat?
Nothing, but just one extra system call in a performance critical path.
Or, if it's really important to avoid the stat, put the code that makes
beyond-POSIX assumptions under #ifdef linux. Then we'd have code that
is in general correct, and avoids a stat on systems known to not return
any bytes on a directory.
I basically whitelisted OSs that are tested by our CI and for which
fread() on a directory FILE* returns 0 and where we can save the stat()
when it is a non-empty file, which is the nominal case for most GDAL usage.
--
http://www.spatialys.com
My software is free, but my time generally not.
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