The X.25 Licensed Program works under the STREAMS environment. Refer to the section on STREAMS in the AIX Version 4.3 Communications Programming Concepts for more details on how this works under AIX.
When an X.25 port is configured, the various modules of supporting code are loaded into the STREAMS environment as shown in the following figure. Then the driver and modules are pushed to create the protocol stack.
Once the system is configured for use, the STREAMS setup happens automatically. Applications of NPI and the instances of the X.3/X.28-based PAD require that an instance of the module be pushed onto the stream. This is taken care of by the application.
For more information on STREAMS concepts and programming, refer to the Unix System V Release 4 Programmer's Guide Streams, published by Prentice Hall and Unix System V Network Programming, by Stephen A. Rago, published by Addison-Wesley, Reading, Massachusetts.
Note: See "Appendix H. Using AIXLink/X.25 over the IBM 2-Port Multiprotocol Adapter" for information on how the x.25 modules are loaded into STRAMS when using 2-Port Multiprotocol Adpaters.
