ULTRIX Guide to Network Programming

This document is the "ULTRIX Guide to Network Programming," published by Digital Equipment Corporation in June 1990 for ULTRIX Version 4.0 or higher.

It serves as a comprehensive guide for experienced programmers familiar with C and ULTRIX networking concepts, introducing them to the architectures and components of the ULTRIX network programming environment.

The manual covers:

• Network Architecture: Including the ISO Reference Model and Digital's network layering schemes.
• Socket Interface: Detailed instructions on using the socket interface for network applications, covering creation, binding, connection establishment, data transfer, and advanced topics like nonblocking sockets, out-of-band data, and broadcasting. It also describes network library procedures for obtaining host, network, protocol, and service information.
• Client/Server Model: Provides code examples for both connection-mode and connectionless-mode client/server applications.
• X/Open Transport Interface (XTI): Explains how XTI fits into the ULTRIX networking environment, supporting transport-independent C library functions for TCP and UDP services.
• Distributed Applications with DECrpc: Describes the programming interface for Remote Procedure Calls (RPC), including the RPC runtime library, Network Interface Definition Language (NIDL) Compiler, and Location Brokers for building distributed applications.
• ULTRIX Extended SNMP Agent: Guides on writing extensions to the Simple Network Management Protocol (SNMP) Agent to manage private Management Information Bases (MIBs).
• Packet Filter Programming: Briefly describes the kernel-resident network packet demultiplexer for low-level access to network data link layers like Ethernet.

The document includes numerous code examples and refers to related ULTRIX documentation for further details.