System Calls are discussed as follows

System calls gives the interface between a process and the OS. These calls are commonly available as the assembly language instructions. The system call interface layer comprises entry point in the kernel code; because all the system resources are managed by the kernel any user or application request which involves access to any system resource should be handled by the kernel code, but the user process should not be given open access to the kernel code for the security reasons. So that user processes can invoke execution of kernel code, several openings into the kernel code, also called as system calls, are provided. System calls allow the processes and users to manipulate the system resources like files and processes.

System calls can be categorized into the groups given below:

1.   Process Control
2.   File Management
3.   Device Management
4.   Information maintenance
5.   Communications

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