In a message dated 10/5/2008 11:55:34 A.M. Central Daylight Time, [EMAIL PROTECTED] writes: >I am looking for the simplest way to intercept/modify an i/o for a VSAM data set without impacting the application. I only know of one way to intercept/modify an I/O of any kind, and it is not simple. You must insert a front-end for an IOS module that is involved with the normal processing of an I/O request before it is started with the SSCH instruction. There are several different modules from which you could choose, but in all cases this is an extremely non-trivial task, your code that inserts the front-end must be authorized, and your code that runs when the I/O is intercepted must be bullet-proof with industrial-strength recovery. If you are not faint-hearted and have a sandbox system that you can crash at least 20 times, email me offline for further enlightenment. And intercepting the I/O is an order of magnitude easier than modifying it once intercepted. The reason that modifying it is so hard is because of the vast complexity of DASD channel programs, all possible variations of which your code must support. Bill Fairchild Rocket Software
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