eventmachine daemon start method

em.rb

@pid_full = '/tmp/my_daemon.pid'

def run
	EM.run{
	 	Signal.trap('INT') { stop }
	 	Signal.trap('TERM'){ stop }
	 	# your daemon code runs here. This will not exit since it is running in EM
	}
end

def get_pid
	if File.exists?(@pid_full)
		file = File.new(@pid_full, "r")
		pid = file.read
		file.close

		pid
	else
		0
	end
end

def start
	pid = get_pid
	if pid != 0
		warn "Daemon is already running"
		exit -1
	end

	pid = fork {
		run
	}
	begin
		file = File.new(@pid_full, "w")
		file.write(pid)
		file.close
		Process.detach(pid)
	rescue => exc
		Process.kill('TERM', pid)
		warn "Cannot start daemon: #{exc.message}"
	end
end

def stop
	pid = get_pid
	begin
		EM.stop
	rescue
	end

	if pid != 0
		Process.kill('HUP', pid.to_i)
		File.delete(@pid_full)
		puts "Stopped"
	else
		warn "Daemon is not running"
		exit -1
	end
end