Getting the calling SQL statement in a PL/SQL function

A programmer here asked me whether there was a way for him, inside a
function, to obtain the SQL used to call the function.  He's tried
identifying the calling session and then looking into v$sqlarea to get
the sql executed by that session, but what shows there is the sql
being executed by his function.  Is there a good way to find the
calling sql with certainty?

Thanks,

Glenn
--
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