I/O PCB or AIB, I/O Area, I/O Area Length, IO Area, area length, area, …

I/O PCB

Pointer to the PCB that represents a destination.

AIB

Specifies the application interface block (AIB) that is used for the call. This parameter is an input and output parameter. The following fields must be initialized in the AIB:

AIBID Eye catcher.

This 8-byte field must contain DFSAIBbb.

AIBLEN AIB lengths.

This field must contain the actual length of the AIB that the application program obtained.

AIBRSNM1 Resource name.

This 8-byte, left-justified field must contain the PCB name IOPCBbbb.

AIBOALEN I/O area length.

This field must contain the length of the I/O area that is specified in the call list.

I/O Area Length

No longer used. For compatibility reasons, this parameter must still be included in the call, and it must contain a valid address.

I/O Area

As an input parameter, used to specify the check point ID (8-bit). As an output parameter, pointer to a buffer to receive the next input message. The area must be long enough to hold the longest message that can be returned.

Area length

Specifies a 4-byte field in your program that contains the length in binary of the first area to checkpoint. This parameter is an input parameter. Up to seven area lengths can be specified. For each area length, you must also specify an area parameter.

Area

Specifies the area in your program that you want IMS to checkpoint. Always specify the area length parameter first, followed by the area parameter.