HP 800 ACSE/Presentation and ROSE Interface Programmer's Guide - Page 33

Step 1: Create a Communication, Endpoint

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Using ACSE/Presentation Step 1: Create a Communication Endpoint Figure 3-1 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. Create a Communication Endpoint Process A Process B ap_open() Communication Endpoint A ap_open() Communication Endpoint B Chapter 3 33

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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
Communication
Endpoint A
Endpoint B
ap_open()
ap_open()
Process A
Process B