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rvnx

MariaDB explicitly checks if the port is non-zero before listening on a TCP socket:

https://github.com/MariaDB/server/blob/ae998c22b2ce4f1023a6c...

> if (mysqld_port)

> activate_tcp_port(mysqld_port, &listen_sockets, false);

if (mysqld_port) means "if mysqld_port is different from 0"

This seems to be at least in MariaDB 5.5 (year 2012)

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And if you set MariaDB to not have Internet connectivity, it attempts to accomplish this by setting the TCP port to 0. Ostensibly because it's not supposed to be a valid TCP port, except it actually is on thousands and thousands of systems.

So I don't know if the check you're referencing is evaluated when someone sets their instance of MariaDB to "not" be internet accessible.

This is the place where the listening socket is initialized, and you can see that if the port is 0, it doesn't do anything. Are you observing different behavior?

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