Guide for the Newbie, Reference for the Pro

After 10 years of developing real-time software for DOS and embedded systems, I needed to develop software for the real-time O/S, QNX, a POSIX compliant O/S. Unlike DOS, QNX is a real operating system which demands a different programming paradigm. Without Lewine's book, I'm not certain I could have made the shift.

This book may be too complicated for somebody unfamiliar with C programming. But, if you know the language, it provides all the basics to successfully create software on a POSIX system. The first half of the book elaborates on how to do things in POSIX. Lewine does not assume that the reader knows anything about UNIX. Plenty of example code clarifies the the theory. All the examples are heavily annotated. One cannot *not* learn the POSIX programming paradigm from this book.

For real-time programming, information about POSIX.4 was needed, and I gleaned this from Gallmeister's PROGRAMMING FOR THE REAL WORLD: POSIX.4, also an O'Reilly book. Once through these books, code began to flow from my keyboard. The QNX library manuals made far more sense.

As an "expert" (I've been doing this for about 5 years), I still refer to the back of Lewine's book. The last half is a reference to the POSIX library functions. Although I haven't done much programming under LINUX, I presume this would be a useful reference for that O/S. The latter half of the book documents the function calls at least as well as any manual for a C programming library that I've ever seen. I've gotten to the point where this book mostly sits on my shelf--but it's comforting to know that when I can't remember the arguments for sigprocmask(), I can take it down and find the answer quickly.

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• Readable, informative, and well organized