Dennis Boone drb at
Mon Nov 19 15:31:06 CST 2018

 > IFBR14 if you all are not familiar with MVS / MVT batch programming
 > is a program which immediately terminates w/o any return codes by
 > doing an assembly language return to the caller of the job step via
 > the contents of R14 of the processor, which is also the return
 > address.

Actually, in the aforementioned environment, it's not really possible to
return without a code.  The relevant register will contain some value,
whether you set it or not.

The famous bug in IEFBR14 was that it failed to set that return code, so
the job often aborted due to whatever garbage was in the register.


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