Operating System Services


- Program execution – system capability to load a program into memory and to run it.

- I/O operations - since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O.

- File-system manipulation – program capability to read, write, create, and delete files.

- Communications – exchange of information between processes executing either on the same computer or on different systems tied together by a network. Implemented via shared memory or message passing.

- Error detection – ensure correct computing by detecting errors in the CPU and memory hardware, in I/O devices, or in user programs.