It is the only method to access the kernel system. The system call uses an API to expose the operating system's services to user programs. When a computer software needs to access the operating system's kernel, it makes a system call. System calls are required for any programs that use resources. The kernel system can only be accessed using system calls. It acts as a link between the operating system and a process, allowing user-level programs to request operating system services. The Application Program Interface (API) connects the operating system's functions to user programs. A system call is a request from computer software to an operating system's kernel. A system call is a method of interacting with the operating system via programs. What is a System Call?Ī system call is a method for a computer program to request a service from the kernel of the operating system on which it is running. In this article, you will learn about the system calls in the operating system and discuss their types and many other things. System calls are predefined functions that the operating system may directly invoke if a high-level language is used. A system call can be written in assembly language or a high-level language like C or Pascal. The program requests several services, and the OS responds by invoking a series of system calls to satisfy the request. Next → ← prev System Calls in Operating System (OS)Ī system call is a way for a user program to interface with the operating system.
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