Operating System Services

Operating System - provides an environment for the execution of programs and services to programs and users

Examples:

• UI (user interface) - Command Line, Graphical UI (GUI), touch-screen, batch

• Program Execution - Must be-able to load a program into memory, and not crash if the program does

• I/O operations - Programs may need IO, this maybe from a file or device

• File system manipulation - Programs may need files, read and write, directories, create/delete them, search for them, info on a file and permissions of the file

• Communications - sharing of information internal and external to the computer, ether done with memory or packets

• Error Detection - Must be-able to detect all errors (device, cpu, memory), take appropriate steps not to crash, and provide error information to help USER or PROGRAMER

• Resource Allocation - When multiple Users or Programs are running, surfactant resources are allocated to each (resources: CPU, Memory, File storage, IO)

• Logging - Logs which users use which resources and how much

• Protection - Controls who accesses what

• Security - Only allows certain actions with User Authentication