About Operating System Services [EASY EXPLANATION]

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operating system services-principle of operating system

In computer science, very common term is to hear is Operating system and after listening operating system the question arises what an operating system does and what services an operating system gives. So, I’m here writing this post to discuss these about operating system.
First of all you all should know what is an operating system?

Definition says that an operating system is like an interface in the form of software (system software)   between user (end – user) and hardware.

From definition of an operating system we can say that it does all the things we are interacting in a computer system.

Here especially I’m focusing on what services an operating system give to the user and the programs used by the user in a computer system.


Program Execution

When a program is going to execute then an operating system has to load that program into memory so it would execute normally or shows an error. This is the service to load program into memory for execution.


File System Manipulation

Operating system provides service to program which is using file system for writing into and reading from files. Other operations handled by operating system on files are deleting and creating files.


I/O Operation

We know that programs running in a computer system could ask for file or i/o operations so these operations can’t be handle by user directly without the help of operating system.


Communication

In a computer system a program or process could ask for information which is using by any another process at that time. So former process needs to communicate with later process, these operations are also handled by an operating system. Communication can also of two types:-

In first case, both processes are on a same computer system.

In second case, both processes are on different computer systems and these computers are linked through a computer network. So communication can be made through shared memory or by message passing mechanism i.e. data packets having information are moved from one place to another.


Error Detection

The operating system constantly needs to be aware of possible errors. Error may occur in the CPU and memory hardware (such as memory error or power failure), in I/O devices (such as connection failure on a network or lack of paper in the printer) and in the user program (such as more use of CPU time, to access illegal memory location). For each type of error the operating system should take the appropriate action to ensure correct and consisting computing.


Resources Allocation

When there are multiple users or multiple jobs running at the same time instant, resources must be allocated to each of them. Different type of resources such as CPU cycles, main memory, files storage, I/O devices are managed by the operating system.


Security

Security of the system from unauthorized users is also an important service provided by an operating system. Such security starts with each user having to authenticate him to the system by the means of a password to be allowed to access the resources. Security must also provide backup and recovery routines for starting over in the event of a system failure.

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