[Dev-luatex] os.execute: All command execution is disabled

[Linas]

Hi, all,
I'm trying to run any program with io.popen or io.execute and it's not working.

1) io.execute returns 'nil'
2) io.popen returns 'nil  All command execution is disabled' 

simple example:
\documentclass{article}
\begin{document}
\directlua{print (io.popen('ipconfig.exe'))}
\end{document}

winxp, texlive2009, luatex version: beta-0.40.6-2009110118

in file 'loslibext-1.c' i see that this output is returned if shellenabledp <=0.
so, question is how to enable shell execution! \pdfshellescape is removed from
that version.

Thanks, Linas