How to test if SELinux is 'running'

["Tom London" <selinux gmail com>]

What is the 'approved' method for determining if SELinux is 'running',
that is, active, and in either enforcing or permissive mode?

If my feeble memory serves me, there used to be a 'isSELinux' or some
such, but I can't seem to find this anymore.

I'd like to modify some scripts to work both with and without SELinux
active, e.g., vmware.  It is currently testing against the contents of
/selinux/enforce, but that does not seem right....

Thanks,
   tom
-- 
Tom London