Re: BUG #17454: Using psql without ipv4 address,the inet_server_port do not return PORT.

On Sun, 3 Apr 2022 at 16:50, Wong Simon <thbytwo@live.cn> wrote:
> If I run multiple instances on one server with local socket, how can I distinguish them?I think the port is need.

You distinguish them by the socket NAME whose "extension" is the port
as a decimal string. The socket name is derived from the port option,
but it is not a port. It's clearly specified:

But if you just need to distinguish instance on diferent ports, query
the "port" configuration parameter, IIRC this is unique ( although may
be you can somehow reuse it with careful usage of listen_addresses and
unix_socket_directories ).