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STREAMS Programming Guide
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Document Information

Preface

Part I Application Programming Interface

1.  Overview of STREAMS

What Is STREAMS?

STREAMS Definitions

Stream as a Data Path

Stream Head

STREAMS Module

STREAMS Device Driver

STREAMS Data

Message Queues

Communicating With a STREAMS Device

STREAMS Multiplexing

STREAMS Polling

Message Transfer Flow Control

When to Use STREAMS

How STREAMS Works--Application Interface

Opening a Stream

Closing a Stream

Controlling Data Flow

Simple Stream Example

How STREAMS Works at the Kernel Level

Creating the Stream Head

Message Processing

Structure of a STREAMS Device Driver

Message Components

Message Queueing Priority

Structure of a Message Queue

Configuring Multiplexed Streams

Multithreading the Kernel

Service Interfaces

Manipulating Modules

Protocol Portability

Protocol Substitution

Protocol Migration

Module Reusability

2.  STREAMS Application-Level Components

3.  STREAMS Application-Level Mechanisms

4.  Application Access to the STREAMS Driver and Module Interfaces

5.  STREAMS Administration

6.  Pipes and Queues

Part II Kernel Interface

7.  STREAMS Framework - Kernel Level

8.  STREAMS Kernel-Level Mechanisms

9.  STREAMS Drivers

10.  STREAMS Modules

11.  Configuring STREAMS Drivers and Modules

12.  Multithreaded STREAMS

13.  STREAMS Multiplex Drivers

Part III Advanced Topics

14.  Debugging STREAMS-based Applications

Part IV Appendixes

A.  Message Types

B.  Kernel Utility Interface Summary

C.  STREAMS-Based Terminal Subsystem

D.  STREAMS FAQ

Glossary

Index

When to Use STREAMS

The STREAMS framework is most useful when modularity and configurability are issues. For instance, network drivers, terminal drivers, and graphics I/O device drivers benefit from using STREAMS. Modules can be pushed (added) and popped (removed) to create desired program behavior.

STREAMS is general enough to provide modularity between a range of protocols. It is a major component in networking support utilities for UNIX System V because it facilitates communication between network protocols.