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The linkage editor, The APPLY and ACCEPT commands invoke system utilities, such as superzap or to perform the actual installation of the SYSMOD into its appropriate libraries. SMP/E also uses these utilities to back out failing maintenance during RESTORE processing.
When SMP/E uses superzap to apply fixes, it instructs superzap to place the SYSMOD ID in an identification data record (IDR data record) in the affected CSECT of the load module. IDR data records store fix (zap) information. SMP/E then records the SYSMOD ID in the UMID subentry of the appropriate MOD entry in the CSI.
On rare occasions, the IDR data record can become too full. The linkage editor initializes a certain number of IDR data records when it creates a load module, and when superzap fills these, the SYSMOD information is no longer captured. You can use the Program Freezer Function (5.5), however, to determine if changes were made, regardless of the availability of IDR data.
When SMP/E uses the linkage editor to install a new function or a replacement module, the linkage editor clears and resets the IDR data records of the program. You can use the Program Statistics Display (5.2) to identify modules that the linkage editor completely replaced. You can find these modules by sorting the Program Statistics Display output by link‑edit date. Note whether the program was relinked after its initial installation. Change control authorizations should support any link‑edits that occurred after the date that the product was installed.
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