Ø  System program –

·         System program provide interface between application program and operating system.

·         System program provide a more convenient environment for program development and execution.

·         Simply user interface to read system tool.

·         There are many types of system call –

1.      File management

2.      Status information

3.      File modification

4.      Programming language

5.      Programming loading and executing

6.      Communication

7.      Background service

    

1.      File management – these program provide create, delete, copy, rename, print etc. it is for files and directories.

2.      Status information –some program simply ask a system for the date-time, amount of available memory or disk space number of user logging and debugging information.

3.      File modification – in this program available to create and modify the content of files stored on disk or other secondary storage device.

4.      Programming language support – compiler, assembler, debugger and interpreter for common programming language(c, c ++,java)

5.      Programming loading and executing – after compiling a program it must be load into memory to be executed use loader linker system program.

6.      Communication – these programs provide the mechanism for creating virtual connection among process, users and computer system. They provide also sharing facility from one to another system.

7.      Background services – background service one continues to run until the system is holted. it is also known as daemons. Example –network daemon, process scheduler daemon etc.