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Further information about all of the books of the late W. Richard Stevens (including program source code, with some modified code versions for Linux submitted by readers) can be found at http://www.kohala.com/start/.
Stevens, W.R. 1998. UNIX Network Programming, Volume 1 (2nd edition): Networking APIs: Sockets and XTI. Prentice Hall, Upper Saddle River, New Jersey.