Chapter 2: Operating-System Structures: Services, System Calls, and Design

Operating-System Structures: Services, System Calls, and Design then explains how operating systems provide application programming interfaces (APIs) that allow programs to request services via system calls, covering common categories like process control, file manipulation, device management, information maintenance, and communications. The discussion extends to system program utilities, which offer a more user-friendly environment by managing file operations, status information, and programming support tools. The chapter also details OS design and implementation considerations, including user goals versus system goals, policy versus mechanism separation, and the trade-offs between microkernel and monolithic architectures. Key topics such as loadable kernel modules, layered approaches, and hybrid systems are examined alongside modern virtual machine concepts and their role in system development and isolation. It covers the importance of OS debugging and performance tuning, as well as system boot processes, from firmware initialization to kernel loading. By the end, readers understand how the structure of an operating system influences its flexibility, maintainability, performance, and ability to support diverse hardware and application environments.