[GENERAL] PL/pgSQL equivalent to PQtransactionStatus?

[Christophe]

My apologies if this is in the docs and I missed it, but is there a  
PL/pgSQL function equivalent for the pglib function  
PQtransactionStatus (i.e., a way to find out if we're in an open  
transaction block, and if that transaction is in an error status)?

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