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z/OS Communications Server: SNA Programmer's LU 6.2 Guide

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z/OS Communications Server: SNA Programmer's LU 6.2 Guide
SC27-3669-00

Important LU 6.2 concepts

LU 6.2 and the VTAM API

Common control blocks and mappings

Access method control block

LU 6.2 control blocks and mappings

Common macroinstructions

Vector lists used during OPEN processing

Vector lists used during APPCCMD processing

Application exit routines

How VTAM implements LU 6.2 architecture

Verbs that VTAM implements

LU 6.2 option sets

Option sets that VTAM implements

Data structures

Designing programs to use LU 6.2 services

Startup processing for LU 6.2 application programs

Negotiating session limits

LU 6.2 transaction processing

Understanding conversations

Conversation queues for macroinstruction processing

Allocating a conversation and receiving the allocate

Comparing normal information to expedited information

Comparing data to indications

Sending and receiving expedited information

Deallocating the conversation

Implementing LU 6.2 option sets

VTAM support for sync point services

Program initialization parameters (PIP) data

Coding the APPCCMD macroinstruction

Managing sessions

How session limits are used

Types of sessions

Number and representation of sessions

Application's role in session limit negotiation

Initiating session limit negotiation

Logon mode table versus LU-mode table

Specifying values for session limit negotiation

Defined negotiation limits

How defined negotiation limits are set

Parameters on the APPL definition statement

Building a CNOS session limits control block

Draining

Session deactivation

Security acceptance information

Security level definition

Overriding the default security acceptance level

Defining negotiation limits and displaying session limits

Initializing and pointing to the control block

Setting session limits to 0

Additional session limit considerations

Parallel session support

Activating and deactivating sessions

VTAM's role in session activation and deactivation

Application program's role in session activation and deactivation

How can the LU names differ?

Ownership of the affinity between an LU and a generic resource member

CNOS general data stream (GDS) variable

Retrieving information for a mode and sessions to be restored

Allocating a conversation

Building an FMH-5

Issuing the CONTROL=ALLOC macroinstruction

Responding to an FMH-5

Receiving data along with the FMH-5

Deallocating a conversation

Deallocating a half-duplex conversation normally

Example of receiving a normal Half-duplex conversation deallocation

Deallocating a Half-duplex conversation abnormally

Deallocating a full-duplex conversation

Deallocating a full-duplex conversation normally

Deallocating a full-duplex conversation abnormally

Using CONTROL=DEALLOC and CONTROL=DEALLOCQ

Sending information

Roles of sender and receiver

Entering SEND state

Example of entering SEND state

Sending normal information

Sending logical record data

Sending confirmation requests

Example of a confirmation request

Sending expedited information

Sending information on full-duplex conversations

Use of the SEND buffer

Flushing the buffer

Roles of sender and receiver

Sending normal information

Sending logical record data

Sending expedited information

Buffer list requirements

Handling storage shortages

Receiving information

Receiving information on half-duplex conversations

Roles of sender and receiver

Entering RECEIVE state

Receiving normal information

Responding to confirmation requests

Receiving expedited information

Receiving information on full-duplex conversations

Roles of sender and receiver

Receiving normal information

Receiving expedited data

Specifying how information is received

Example of using any-mode RECEIVEs

Continuation modes for receiving expedited information

Error handling

Sending and receiving data using high performance data transfer

Sending data using HPDT

SEND processing using the HPDT interface

Creating and sending multiple pieces of data in one CSM buffer

Receiving data using HPDT

Considerations for the successful completion of a receive

Controlling the amount of data received

Data delivery considerations

Cross-memory considerations when the RPL is not posted complete

Application data clear responsibilities

Using exit routines

Vectors provided for the ATTN(CNOS)

LOSS function

Using other EXLST exit routines

Application programs without a LOGON exit routine

SCIP

Application programs without a SCIP exit routine

LOSTERM exit routine

VTAM's LU 6.2 security options

Defining profiles for LU-LU session pairs in RACF

Session-level verification

Defining the degree of level 1 session-level verification

Defining the degree of level 2 session-level verification

Conversation-level security

Data encryption

Handling errors

Data purging and truncating

Conversation states

APPCCMD macroinstruction overview

Example of a sample LU 6.2 application program

Example of retrieving information for a mode and any restored sessions

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