Part II: 2. OS structure [B1]

Question 1

OS services;
What are the services for the users?

Answer 1

Will vary from one OS to another, but common classes are:
User interface: GUI, CLI
File system access: create, read, write, and delete files through the file system.
I/O operations:
Program execution: Load, run and execute.
Communication
Error detection.

The services provided by the OS aim to make the computer more accessible and manageable for users, shielding from complexities of hardware an low-level system operations.

Question 2

OS services; what are those that facilitate the operations of a computer system?

Question 3

System calls; what is a system call and how does it work?

Answer 3

A system call provide an interface to the services, made available by an OS. -> User-level processes to request services of the OS.

Question 4

System calls; Provide an overview of different types of system calls.

Answer 4

Categories:
1: process control
2: file management
3: device management
4: information maintenance
5: communications
6: protection

Question 5

What are system programs?

Answer 5

Bundles of useful system calls. They provide basic functonality to the users so that users do not need to write their own programs to solve common problems.

Question 6

Overview of OS structures.