DFHZARL executable module

Entry points

DFHZARL1

Called by

DFHACP, DFHCPCBA, DFHCPCLC, DFHCRS, DFHEGL, DFHETL, DFHLUP, DFHXFP, DFHXTP, DFHZARL, DFHZARM, DFHZERH, DFHZISP, DFHZLUS, DFHZSUP, DFHZTSP, DFHZXRL, DFHZXRT

Description

DFHZARL is called via the DFHLUC macro, which passes the LU6.2 request in a parameter list mapped by the DFHLUCDS DSECT. If the request is for a remote APPC device, DFHZARL passes the parameter list to DFHZXRL for processing. (APPC is advanced program-to-program communication.) Otherwise, it examines the parameter list to determine the function required. Most functions are processed by DFHZARL. However, it calls the following modules as indicated:

DFHZARER - Protocol errors and exceptions
DFHZARR  - RECEIVE requests
DFHZARRA - FREE-STORE requests
DFHZERH  - Handling FMH7s and negative responses
DFHZISP  - ALLOCATE and FREE requests
DFHZRVL  - Receiving SNA indicators from z/OS Communications Server
DFHZSDL  - Sending data to z/OS Communications Server.

It also manages the logical receive buffer pointers TCTERBLA and TCTERBLL in a consistent manner with the physical receive buffer pointers TCTERBA and TCTERBDL, as (address, length) pairs.