TLMSCMND passes buffer addresses to the exit routine using standard linkage conventions (register 1 points to a parameter list). The two buffer addresses are
The exit must set the return code (register 15) to zeros to allow continuation or to nonzero to reject the input and display the message returned by the exit. This user exit should be assembled and linked through SMP USERMOD. An example of the JCL is located in CAI.CTAPJCL (TLMJU012).
This exit is activated by specifying YES for the CMDEXIT system option.
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