AIFs for Large Files

by Rajesh Channabasavaiah
Commercial Systems Division

The Architected Interface Facility (AIF) Operating System product has been enhanced to handle the instances of Managing Large Files (Up to 1TB) with the AIF Intrinsics. AIFs are a software layer between non-operating system software and internals providing controlled access to MPE/iX internal functionality and data structure. For Release 6.5, four AIF Intrinsics have been identified and modified to obtain the required functionality for handling Large Files.

The four AIF Intrinsics are as follows:

Enhancement for AIFFILEGGET/AIFFILEGPUT

These Intrinsics have been enhanced for handling Large Files with the addition of three item numbers which are as follows:

Item #	Item Type	Description
5101	Longint_type	End of File
5102	Longint_type	File limit
5103	Longint_type	Number of Sectors

Enhancement for AIFFILELGET/AIFFILELPUT

These Intrinsics have been enhanced for handling Large Files with the addition of a New Item number which is as follows:

Item #	Item Type	Description
4101	Longint_type	Record pointer offset

Error Messages

Two New Error Messages have been introduced for the AIF:OS product as part of the Large Files project to handle the existing items and the new items for the Intrinsics documented above.

Error #	Description
4101	Set if the designated file is a Large File
4102	Set if the designated file is not a Large File