About SIGKILL/SIGSTOP new syscall in FreeBSD Unix signal subsystem

Greetings,

I am trying to write a small syscall on FreeBSD 12.4-REL, purely for educational purpose.
I want to avoid SIGKILL/SIGSTOP signals in FreeBSD/Unix, so I try to understand /usr/src/sys/kern/kern_sig.c .
Can you help me, please ?

My idea is not new. My Linux implementation worked on Linux 4, Linux 5, Linux 6. Now I am trying
to write a clean FreeBSD 12 system call, with this idea -- http://code.uriel.ro/inventica/angel.html .

Please help me with some guidance.
Thank you !
Alex.
 
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