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proposal : backend startup hook / after logon trigger

From: Tomas Vondra <tv(at)fuzzy(dot)cz>
To: pgsql-hackers(at)postgresql(dot)org
Subject: proposal : backend startup hook / after logon trigger
Date: 2011-11-11 00:12:02
Message-ID: (view raw or whole thread)
Lists: pgsql-hackers

I occasionally need to perform some action whenever a user connects, and
there's nothing like an "AFTER LOGON" trigger (available in some other

Is there any particular reason why there's not a "backend start hook",
executed right after a backend is initialized? I've tried a very simple
PoC (basically just a new hook definition, called from PostgresMain(),
see the after-logon-hook.diff (and a simple module that uses it is in

This obviously is not a complete patch or something, but is there a good
reason why this is a stupid idea?

Obviously this is a bit low-level approach, as most of the time the
triggers are implemented in a PL. But who says you can't call a PL from
the C module ...


Attachment: after-logon-hook.diff
Description: text/plain (1.6 KB)
Attachment: logon.c
Description: text/x-c (1.1 KB)


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