general


timer:

nanosm::Timer : nanosm::EventLoop::Pollable
	bool Set(... duration, ... callback);
	// OnReady() will just call the timer callback


proesses:

nanosm::Process : nanosm::EventLoop::Pollable
	void Kill();
	bool Spawn(... exitCallback);

	static std::shared_ptr<Process> SpawnCmdLine();

nanosm::RestartingProcess final : Process
	// spawn is shadowed by a version that exits callback to set timerfd-backed timer which on expiry/callback will be cancelled
	// then spawn the process again (which will make it have a valid pidfd again etc etc

	std::shared_ptr<Timer> timer;

program mainn flow:

main()
	parse config (fail if it's bad)
	create state (nanosm::NanoSm), from parsed config
	create event loop
	post callback into event loop to run state
	run event loop

nanosm::NanoSm::Run()
	spawn wm (if this fails give up and exit early)
	for each app (in toml order):
		spawn app

	return (the event loop wil persist and keep everything alive until it needs to shutdown)