ACC X.25 Protocol User's Guide

64 Chapter4

X.25 Application Programming

Introduction

CAUTION TheAPIdescribedheremaynotbeusedforanX.25linkorVCZLUthat

is accessed or used by the X.25/9000 Streams product.

This chapter contains a general discussion of programming using the

ZCOM a n d ACC X.25 API calls for communicating across X.25 Virtual

Circuits. However, before reading this chapter you should review

chapters 1, 2, and the section “Message Header” in chapter 3 of the

ACC Programmer’s Reference Guide. You should also review the

following man pages: zinit(), zopen(), zinfo(), zset_rcvr(), zcntl(), zsend(),

zread(),andzclos(),intheACC Programmer’s Reference Guide.Inmost

X.25 applications, these are the core general ZCOM API routines that

will be used.

The general ZCOM API routines are used to initialize your application

and to send and receive data to/from Virtual Circuit ZLUs. The ACC X.25

API routines are used to perform X.25 specific actions such as

establishing and clearing calls on SVCs or sending Reset Requests. This

chapterisbrokenintofoursections:ProgrammaticConfiguration,X.25

Link Ini tialization, S ending and Receiving data, and Using the X.25 API

routines.

To help you understand the general structure of a n X.25 application, the

following pseudo code example is provided.