(_Ropnfbk(openFile))->pgm_record_len will give you the record length forthe
_RFILE * open file handle (pOpenFile in my example).
As for more info, check out the following manuals:
"ILE C/C++ Run-Time Library Functions"
"ILE C/C++ Programmer's Guide" -- for some reason IBM puts it under
Websphere Development Studio category
There are other manuals I use, but these should suffice I think.