Chapter 24. TCP: Transmission Control Protocol


The Transmission Control Protocol, or TCP, provides a connection-oriented, reliable, byte-stream service between the two end points of an application. This is completely different from UDP’s connectionless, unreliable, datagram service.

The implementation of UDP presented in Chapter 23 comprised 9 functions and about 800 lines of C code. The TCP implementation we’re about to describe comprises 28 functions and almost 4,500 lines of C code. Therefore we divide the presentation of TCP into multiple chapters.

These chapters are not an introduction to TCP. We assume the reader is familiar with the operation of TCP from Chapters 1724 of Volume 1.

Code Introduction

The TCP functions appear in six ...

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