It's not hard. Start psql, then in another window use ps to determine the PID of the connected backend. (The pg_stat_activity view might help too.) Then
gdb /path/to/postgres-executable PID gdb> b whereever gdb> cont
and away you go.
I'd add that when working with shared libraries, you need to make sure they are loaded before you attach to the process (I think there is a way to deal with it after the fact, but I'm not sure of the details). To do that, either execute a function in the library (e.g. select dblink_connect...) or use the LOAD command like this:
regression=# load '$libdir/dblink'; LOAD
HTH,
Joe
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