posix-programmers-guide
This book is a guide to the operating system interface as guaranteed by the POSIX standard. You can write complete,conforming applications by using the information in this book.The POSIX library of functions is complete enough to write many useful and sophisticated applications.However,there are many areas that the POSIX standard does not yet address. Thus,programmers must implement strategies that isolate nonportable code from portable-code,such that even hardware-dependent features are easily identified.The object of this book is to help the programmers resolve portability issues at the design stage of development,and not after the program has been fully implemented on a particular system.