This exit allows you to provide an exit routine for scanning JCL and JES2 control statements for jobs submitted through card readers, RJE, SNA and BSC NJE, and SPOOL reload. For jobs submitted through internal readers or TCP/IP NJE, exit 54 is called to process JCL and JES2 control statements (JECL). If this exit is implemented and enabled, it is taken whenever JES2 encounters a JCL or JES2 control statement. (Note: JOB statements are not included in the scan).

For JCL statements, your exit routine can interpret JCL parameters and, based on this interpretation, decide whether JES2 should cancel the job, purge the job, or allow the job to continue normally. Your routine can also alter JCL parameters and supply additional JCL parameters. If necessary, in supplying expanded JCL data, your routine can pass a JCL continuation statement back to JES2 or add statements before or after the current JCL statement.

For JES2 control statements, your routine can interpret the JES2 control parameters and sub-parameters and, based on this interpretation, decide whether JES2 should cancel the job, purge the job, or allow the job to continue normally. For any JES2 control statement, you can write your exit routine as a replacement for the standard JES2 control statement processing , suppressing execution of the standard JES2 scan, or you can perform your own (partial) processing and then allow JES2 to execute the standard control statement routine processing. Also, your routine can alter a JES2 control statement and then pass the modified statement back to JES2 for standard processing, or your routine can pass an entirely new JES2 control statement back to JES2, to be read (and processed) before or after the current control statement.

This exit also allows you to process your own installation-specific JES2 control statements or to implement new, installation-specific sub-parameters for existing JES2 control statements.

This exit gets control when JES2 detects a JES2 control statement or JCL statement within a job. JES2 also gives control to your exit routine when JES2 detects a JES2 control statement or JCL statement outside a job. JES2 also gives control to your exit routine when it detects a JCL continuation statement.

This exit allows you to input processing - JCL/JECL.