How to fire trigger/event on session end !?

Is there a way to fire trigger or some store procedure just before session ends, but also get info from ending session (like Terminal, Machine, User...) ?

create table logoff_tbl (
  who  varchar2(30),
  when date
create trigger trg_logoff
before logoff on database
begin
  insert into logoff_tbl values(sys_context('userenv','session_user'), sysdate);
end;
/

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