Question

What is meant by a System Call? How it is used? How does an Application
program (AP) use these calls during execution?​

Answer 1

Answer:

In computing, a system call is the programmatic way in which a computer program requests a service from the kernel of the operating system it is executed on. ... System calls provide an essential interface between a process and the operating system.

System call provides the services of the operating system to the user programs via Application Program Interface(API). It provides an interface between a process and operating system to allow user-level processes to request services of the operating system. System calls are the only entry points into the kernel system.

For example if we need to write a program code to read data from one file, copy that data into another file. The first information that the program requires is the name of the two files, the input and output files.

In an interactive system, this type of program execution requires some system calls by OS.

• First call is to write a prompting message on the screen

• Second, to read from the keyboard, the characters which define the two files.

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