Access to transaction status

Hi all,

I am currently implementing an experimental middleware based replicator for
a set
of fully replicated databases.

Do be able to handle all sorts of failures I needed two functions:

- A function to get the current XID
- A function which I can use later to tell if a given XID
commited/aborted/whatever

I did a small implementation of this (see attachment).

Could one of you hackers tell me if you think this is

- an ugly way of  accessing the clog?
- totally wrong because I missed some point?
- or a good and correct idea :)

It would be very nice if someone had the time to have a short look into
this.

Greetings,
Christian