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Shared Memory Under Linux

Mike Perry (mikepery@fscked.org)

11/9/99

This document aims to provide an overview of shared memory under Linux. It coveres both the System V IPC, and BSD mmap(). It is intended for those who have a basic familiarity with ANSI C. A sample and oversimplified malloc debugger is provided as an example program.

1. Introduction

1.1 What is Shared Memory?
1.2 Types of Shared memory available
1.3 General Principles

2. BSD mmap

2.1 Synopsis
2.2 Overview

3. Examples

4. Writing a malloc debugger

4.1 Concepts
4.2 Goals
4.3 Code

5. System V IPC

5.1 Introduction
5.2 Common Ground
5.3 Shared segments
5.4 Message Queues
5.5 Semaphores

6. System V vs. BSD

6.1 BSD mmap

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