Informix- Oracle migration: OMWB misapplies SUBSTR function !!!

Question

New problem occured:
OMWB translates Informix's substrings wrong:
Examples of translations:
INFORMIX ORACLE
wvs[1] SUBSTR(wvs,1)
wvs[2,10] SUBSTR(wvs,2,10)
wvs[10] SUBSTR(wvs,10)
It seems, that OMWB only copies index numbers in square brackets as parameters of Oracles's SUBSTR function. But SUBSTR works differently by string indexes closed to [] in Informix !
wvs[1] means 1-st character of wvs string, wvs[3,5] means substring from 3-rd to 5-th character of wvs (length 3), but SUBSTR(wvs,1) means substring from 1-st chracter to end of string, SUBSTR(wvs,3,5) means 5-characters long substring from 3-rd to 7-th character, e.t.c.
Vladimir Kubanka alias Bare Foot
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Answer 1

Well, I obtained <process_id> from V$SESSION, (...WHERE audsid=to_number(sessid) , ... , sessid:= sys_context('USERENV','SESSIONID') ).
But problem: this process_id is not the same, which has some process, creating standard tracefile "ora_<process_id>_orcl.trc".
In case I run procedure from SQLPLUS, process_id was for example 3258 and trace file had name "ora_3259_orcl.trc". It seems that tracefile was created by some child process, called from sqlplus (having UNIX process_id 3258). But it means, that child's process_id could be bigger more than +1 (when more users works in the same time). And in case I run procedure from some Windows-oriented client on my PC, the <process_id> (obtained from V$SESSION as written above in procedure) had some nonsense value (for ex. 54823716) and tracefile I found under name "ora_3271_orcl.trc" - it seems that process, creating tracefile had normal UNIX-liked process_id 3271. From this issues questions:
1. Is there some way to obtain in procedure process_id, which creates that standard tracefile?
OR:
2. Is there some way to obtain (in procedure) name of that tracefile ? (written into directory defined in USER_DUMP_DEST parameter)
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