This book is deservedly popular with serious programmers around the world, as it contains the most important and practical information about managing UNIX and Linux kernels. Without this knowledge, it is impossible to write effective and reliable code. From the basics - files, directories and processes - you will gradually move on to more complex issues, such as signal processing and terminal input, a multithreaded execution model and interprocess communication using sockets. In total, this book covers more than 70 interfaces, including POSIX asynchronous input functions, cyclic locks, barriers, and POSIX semaphores.