Wal -long transaction

[Agnes Bocchino <agnes.bocchino@xxxxxxxx>]

I would like to know how Postgresql works when all the files 
(checkpoint_segment *2 + 1)
are full ,
does Postgresql rollback the transaction when all the wal segments are used,
or does the server stop with an error message ?
(I have tried to make the test but without success for finding a long 
transaction)

thanks
regards