Real time signals in ROOT

Does root support real time signals SIGRTMIN to SIGRTMAX? I know TSignalHandler can handle the POSIX.1 signals but I would like to use and handle the real time ones in a ROOT application.

If the classes to use real time signals do not already exist would I be breaking ROOT by installing the signal handlers with direct system calls like sigaction?
Would it be safe to make calls to the ROOT libraries from such custom handlers?