rtapi_is - details of rtapi configuration

rtapi_is_kernelspace() returns nonzero when rtapi modules run in kernel space (e.g., under RTAI) and zero
       when they run in userspace (e.g., under uspace).

       rtapi_is_realtime()  returns  nonzero  when  capable of running with realtime guarantees.  For rtai, this
       always returns nonzero (but actually loading  realtime  modules  will  fail  if  not  running  under  the
       appropriate kernel).  For uspace, this returns nonzero when the running kernel indicates it is capable of
       realtime  performance.   If rtapi_app is not setuid root, this returns nonzero even though rtapi_app will
       not be able to obtain realtime scheduling or hardware access, so e.g., attempting to  loadrt  a  hardware
       driver will fail.

       rtapi_is - details of rtapi configuration

       May  be called from non-realtime or from realtime setup code.  rtapi_is_realtime() may perform filesystem
       I/O.

       Zero for false, nonzero for true.

LinuxCNC Documentation                             2006-10-12                                   rtapi_is(3rtapi)

       int rtapi_is_kernelspace()

       int rtapi_is_realtime()