Understanding completion codes for EXEC-Initiated EXECs with WAIT(YES) and User-Written programs

Both EXEC-initiated EXECs with WAIT(YES) and user-written programs gain control of the thread while the execution of the initiating EXEC is suspended.

When the execution of the initiating EXEC is resumed the initiating EXEC can determine the success of the called EXEC or program by testing the BBI variables IMFCC and IMFRC.

If IMFCC is zero, meaning the EXEC (with the WAIT(YES) parameter) or user-written program was successfully scheduled, a separate local variable, IMFRC, will be set with the return code from the program or EXEC. A selected EXEC with WAIT(YES) can return this value by using the EXIT command. See EXIT. The following example causes IMFRC to be set to 12 when the calling EXEC receives control: