Support listen systemd.socket

[uasan]

Hi.

To start the service on demand, support for the systemd.socket is necessary, for example, as is done in other servers:
https://github.com/rubenv/node-systemd

app.listen('systemd', ...);

Is planned implement?
Thanks.

[ghost]

No that sounds like a bad idea.

[uasan]

Ok, maybe zero port (0 fd STDIN)?
This is also a working for systemd.socket

app.listen(0, ...);