Operating System: System Calls and System Programs

System Calls and System Programs

System calls provide an interface between the process and the operating system. System calls allow userlevel processes to request some services from the operating system which process itself is not allowed to do. For example, for I/O a process involves a system call telling the operating system to read or write particular area and this request is satisfied by the operating system.

System programs provide basic functioning to users so that they do not need to write their own environment for program development (e.g. editors, compilers) and program execution (shells). In some sense, they are bundles of useful system calls.

Types of System Calls are: Click Here