How do I find my own session's serial# ?

How do I kill a list of processes, ensuring the executing session is not one of them?

I need both sid SID and SERIAL# and this is the only way I could think of getting them.

PL/SQL snippet:

select  sys_context ('USERENV','SID'),sys_context('USERENV','SESSIONID') INTO  env_sid, env_sessid FROM dual;

select serial$ from gv$session into env_serno where sid=env_sid and audsid=env_sessid;

I thought this would be OK, but after a couple weeks of using it the procedure, a user has complained that they received the  "ORA-01422: exact fetch returns more than requested number of rows".   I assume it was the second statement that produced the error.   We can't reproduce it now.