. Recently a question was posted regarding SubSystem Datasets, more appropriatly the use of a SUBSYS= parameter on a DD statement. //DD1 DD SUBSYS=(ssn,'parms'). . I believe this information was once documented in GG66-3131 (the SubSystem Interface in MVS/SP Version 3) and documented the SSI function codes for Allocation, Converter, Open, Close and GET). . . After several days of reserach I do see that IXGSEXIT (log stream subsystem exit) may be the documentation that replaced GG66-3131. IXGSEXIT can support applications that use QSAM and BSAM (GET and READ) requests to sequential dataset. . . IXGSEXIT documents similar exit points for Allocation, ConVerter, Open, Close, GET, and unallocate. . . In either case both documents provide similiar functionality with respect to processing SubSystem Dataset via the SUBSYS= parameter on a DD statement. . . However neither technology provides a PUT/WRITE function/exit. So how does the SubSystem Address Space process a PUT/WRITE from an application that has a DD SUBSYS=xxxx statement ? . How does the Subsystem Address Space get notified that a record was written to it ? . . Simple Example: Lets say for this discussion I want to transfer all I/O from a an applications SYSOUT DD with SUBSYS=xxxx to a 64Bit Memory Chunk. Once I have all my exits established, Each I/O from an application with the appropriate SUBSYS statement should be directed to my SubSystem Address Space. Do I understand this correctly ? . How does the subsystem address space receive/obtain the data from the Applications PUT/WRITE statement, so that the SubSystem Address Space can populate the 64Bit Memory Chunk ? . . Paul D'Angelo ************* .
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