Isn't this provided by inetd and systemd? They bind the socket and hand it to the server, who doesn't need permission to bind any port at all? (with the added o

Isn't this provided by inetd and systemd? They bind the socket and hand it to the server, who doesn't need permission to bind any port at all? (with the added optional benefit of "socket activation", i.e. starting the server on-demand when the first connection comes in)