RT_PREEMPT autodetection from user program

Hi,

I need to autodetect the RT kernel for an application which runs under RTAI, Xenomai, RT_PREEMPT and vanilla kernels. 

To support a unified binary, I need to runtime detect the RT OS - what are my best options for RT_PREEMPT? from https://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO#Checking_the_Kernel I gather the single method:

parsing 'ps' output for IRQ handlers being kthreads, i.e. for '[IRQ' or '[irq'

any chance of doing better than that, or parsing of utsname.release for "-rt"?  A false positive on a vanilla kernel could be a safety hazard.

thanks in advance,

Michael