ACSE/Presentation and ROSE Interface Programmer's Guide

Chapter 3 33

Using ACSE/Presentation

Step 1: Create a Communication Endpoint

Step 1: Create a Communication

Endpoint

Process A and Process B must both create communication endpoints as

shown in Figure 3-1, using the call ap_open(). A communication endpoint

is a ﬁle descriptor (fd) which is returned on successful completion of the

ap_open() call. The process uses the ﬁle descriptor in all subsequent A/P

calls.

Each process must create a communication endpoint, and only one

association can be associated with each endpoint. To create multiple

associations, you must create additional communication endpoints for

each one.

Figure 3-1 Create a Communication Endpoint

Communication

Endpoint A

Endpoint B

ap_open()

Process A Process B