https://docs.oracle.com/cd/E86824_01/html/E54765/execl-2.html
exec, execl , execle , execlp , execv , execve , execvp , fexecve - execute a file
man pagessystem callsexeclsection
https://www.qnx.com/developers/docs/6.6.0_anm11_wf10/com.qnx.doc.neutrino.lib_ref/topic/e/execl.html
execl