36 Chapter 3
Using ACSE/Presentation
Step 2: Establish an Association
APRI also supports the binding of the local presentation address without
specifying a network address. This allows a single responder to receive
association indications for any of the subnetworks configured on an OTS/
9000 system. To use this feature, when setting the local address through
the AP_BIND_PADDR environment attribute, set the n_nsaps field of
the ap_paddr_t structure to zero. When this feature is used, no local
NSAP information need be provided in the ap_paddr_t structure.
NOTE Rebinding the presentation address to a communication endpoint is not
supported in this release. Binding to the presentation address can only
be done in the AP_UNBOUND state.
Figure 3-4 Bind Endpoint to Presentation Address
Set up the Data Transfer Environment
In order for Process A to communicate with Process B, Process A calls
ap_set_env() using the AP_REM_PADDR attribute which contains the
presentation address of Process B. (See Figure 3-5.)
Communication
Communication
Endpoint A
Endpoint B
Process A Process B
AP Environment A AP Environment B
ap_set_env()
ap_set_env()
AP_BIND_PADDR,
AP_BIND_PADDR,
a_p_set,
a_s_set,
a_t_set,
a_nsap
b_p_set,
b_s_set,
b_t_set,
b_nsap
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