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Linux Socket Programming by Example by Warren W. Gay

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Chapter 14. Out-of-Band Data

This chapter will bring you into the fray of using out-of-band data with TCP. You will learn why it is provided and about some of its pitfalls. Most important of all however, you will become equipped to properly apply out-of-band modes of communication, with any protocol that supports it.

Here is a summary of what will be covered in this chapter:

  • Define what out-of-band data is.

  • Why is it needed?

  • What are the socket related issues of using it?

  • What are the variations in the TCP/IP implementation?

  • How do you use it with TCP stream sockets?

Defining Out-of-Band

Imagine a lineup of people at the bank waiting to cash their paychecks. The line forms a queue, in which people eventually move forward to be served by a teller. Now ...

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