z/OS V1R6.0 DFSMS Access Method Services for Catalogs

Invoking from ProgramIOROUTINE: Address of the program that is to be invoked to process I/O operation upon the data setassociated with DDNAME. This routine, instead of the processor, is invoked for all operations againstthe data set. See “USER I/O ROUTINES” in this appendix for linkage and interface conventionsbetween the IOROUTINE and access method services.AUSER DATA: Address, supplied by the user, that is passed to the exit routines.Auxiliary List‘AUXLIST’LENGTHFLAGSRESERVEDACEROVOLISTBASEVOLAuxiliary list: Optional. Provides away to allow migration/recall products topass indications through AMS IMPORT toSMS for volume selection.‘AUXLIST’: 8-character identifierwith name of control block.LENGTH: A halfword that specifiesthe length of the AUXLIST.FLAGS: One byte of processingflags used by AMS.‘AUXVOLST’LENGTHVOLIST CNTVOLUME INFO #1ACERO: Address of the ACEROcontrol block to be passedto SMS.VOLIST: Address of the space providedfor IMPORT to return to a list of volumename and associations used to satisfythe request.BASEVOL: Address pointing to the volumeserial number of the base cluster foran ALTERNATE INDEX.VOLUME INFO #nWORKAREA VOLUME LIST: Provides a listlarge enough to return the informationnecessary for the object being imported.‘AUXVOLST’: 8-character identifierwith name of control block.Figure 31. Processor Invocation Argument List from Your Program (Part 2 of 2)LENGTH: One fullword that specifies thenumber of bytes in the volume list.VOLIST CNT: One fullword that specifies thenumber of VOLSERS returned. For multi-volumeimport, the volume list can be as large as 118volume (59 for data component, 59 for indexcomponent).VOLUME INFO: Multiple volume informationentries. Each contains two bytes of a sixcharacter volume name, return status for thevolume, and a character association (D or I).Processor InvocationFigure 31 on page 425 shows the processor invocation argument list as it exists inthe user’s area. The 24-bit virtual addresses are passed in argument lists, controlblocks, buffers, and user exit routines.426 z/OS V1R6.0 DFSMS Access Method Services for Catalogs