The C Library Reference Guide
by Eric Huss
This guide provides a useful look at the standard C programming language. In no way does this guide attempt to teach one how to program in C, nor will it attempt to provide the history of C or the various implementations of it. It is merely a handy reference to the standard C library. This guide is not a definitive look at the entire ANSI C standard. It is simply a quick reference to the functions and syntax of the language.
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by David A. Curry - O'Reilly
'Using C on the UNIX System' provides a thorough introduction to the UNIX system call libraries. This book is aimed at programmers who already know C, but who want to take full advantage of the UNIX programming environment.
This online wiki book is a quick and easy introduction to the ANSI C programming language. It is written by a novice, and is intended for use by a novice. However, it does assume some familiarity with a programming language.
by Brian Hall
A brief how-to guide on network programming using Internet sockets, written for anybody who is just starting out with socket programming. The section on Windows programming is also included. The guide is updated for IPv6.
by K. Joseph Wesley, R. Rajesh Jeba Anbiah
This is an intermediate to advanced C programming book writen for C lovers, students, programmers, and other enthusiasts. The book is written to open many secrets of C, it alos introduces various approaches to solve different problems.