I wrote the following two chapters in C Unleashed: 

Chapter 22 Cross-Platform Development: Communications Programming
Chapter 23 Writing Common Gateway Interface (CGI) Applications in C

It was an interesting experience, I enjoyed it and cursed it at the same time.  In any event, here is a brief description of the books contents and some links you may find useful.  

Publisher:  Sams 

ISBN:        0672318962

1400 pages Book & CD edition (August 18th, 2000)

C Unleashed is a very comprehensive book on the ANSI C programming language. This book promotes solid, portable programming using ANSI C, thus benefiting programmers on any platform, including mainframes. Covers the New Standard for C, known as C9X, and includes embedded systems, simulation processing, threading and multiprocessing, digital signal processing, and natural language processing.

Covers the recently ratified new C standard - C99

Focuses on portable programming, providing code that is useful across all platforms, including mainframes

CD-ROM contains arbitrary precision math and matrix math libraries, tree and sorting libraries, debugging trace routines, Julian date conversion routines, memory allocation tracking source code, DJGPP compiler and a draft of the new C99 standards

Amazon.com Listing 

Errata Updates .. err, yes even my chapters have errata updates.