System calls and services are at the heart of any operating system. This is the free course of the second part of an operating system. However, if you have completed part one, then you can get started with this unit. The concepts include understanding various operating system services, system calls, API calls, file system structure, and a lot more. You will also be able to have an understanding of the various types of system calls as well. In this course, you will understand Operating system services, Types of System calls, and File system structure. Enroll today & get a free certificate.