implement zero downtime restarts & let systemd manage the socket
socket is now managed by systemd and passed to the server, the server then takes over. on receiving INT, TERM or QUIT the server tries to finish all pending calls and then detaches from the socket again, so it gets traffic queued, and quits. if/when traffic is queued systemd will (re)start the service to begin the dance from the top the server no longer has builtin listening capabilities. it must always be started through the service or manually via systemd-socket-activate code cheekily borrowed from my geoip service
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