Getting current transaction id

Hello all

I'm in the need for my custom written replication engine to obtain the current
transaction id from a trigger function. As far as I'm told it's not possible
today. Would people object much if this functionality was added for 8.2 ?
It's the last piece of postgresql C code I have left in my application and I
think it would be a nice information in general to have available for users.
If not for anything else then for simple statistics.

I attached the function I use with great success today.

Best regards,
Nicolai Petri

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PG_FUNCTION_INFO_V1(get_transaction_id);

Datum get_transaction_id(PG_FUNCTION_ARGS) {
TransactionId curxact;

curxact=GetTopTransactionId();
return Int32GetDatum(curxact);
}
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