The proper way to do this is to have a way for processes to consume sort of public event queue exported by the service in question, and conditionally exec(3) pr

The proper way to do this is to have a way for processes to consume sort of public event queue exported by the service in question, and conditionally exec(3) processes in response. Much like the kernel has uevents for device node managers to listen on over a Netlink channel. Without proper mechanism, you can't have true activation from a black box.