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Question: What is difference between system call and system program?

Answer: system call will cause CPU running level switch, from user level to kernel level,while system program maybe is simple library function, like sins,cons.



Category Operating Systems Interview Questions & Answers - Exam Mode / Learning Mode
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Question: What is difference between system call and system program?
Answer:

system call will cause CPU running level switch, from user level to kernel level,while system program maybe is simple library function, like sins,cons. Source: CoolInterview.com

Answered by: Lu Deliang | Date: 11/7/2007 | Contact Lu Deliang Contact Lu Deliang

System call is an interface between running procee and O.S. If a process needs a service from O.S. it issues a system call. <br>System program is a program provided by the O.S. for some common task. Source: CoolInterview.com

Answered by: Sarwat Nizamani | Date: 11/14/2007 | Contact Sarwat Nizamani Contact Sarwat Nizamani

system call are special APIs provided by OS to<br>let the user manipulate hardware in restricted manner or to do priviledged jobs.<br>where as system programs are special program which are lies between OS and Application programs. They are closer to kernel as compared to application programs. ex compiler , OS , Editor. Source: CoolInterview.com

Answered by: Manish Gupta | Date: 11/15/2007 | Contact Manish Gupta Contact Manish Gupta

A system call is a request to the operating system to do something. A system program is a program that provides services to other programs. An os is an example of a system program. Source: CoolInterview.com

Answered by: Prateek Nagaria | Date: 9/21/2009 | Contact Prateek Nagaria Contact Prateek Nagaria

system call provide an interface to the sevices made available by the o.s.. Source: CoolInterview.com

Answered by: sweta | Date: 5/28/2010 | Contact sweta Contact sweta

System calls provide an interface between the process an the operating system. System calls allow user-level processes to request some services from the operating system which process itself is not allowed to do. In handling the trap, the operating system will enter in the kernel mode, where it has access to privileged instructions, and can perform the desired service on the behalf of user-level process. It is because of the critical nature of operations that the operating system itself does them every time they are needed. 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 (editors, compilers) and program execution (shells). In some sense, they are bundles of useful system calls.

Source: CoolInterview.com

Answered by: suman gupta | Date: 6/10/2010 | Contact suman gupta Contact suman gupta


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