GATE (Graduate Aptitude Test in Engineering) Computer Science & IT (CS) Operating System-Processes Study Material (Page 12 of 14)

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System Calls

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  • This is a leftover topic of the Operating systems. Though the term has been used very often in many of the topic that we have already seen, let us just define it formally.

System Call

  • It is the programmatic way in which a computer program requests a service from the kernel of the operating system it is executed on. If a program in user mode requires access to RAM or any other hardware resource, it must ask the kernel to provide access to that resource.
  • System call provides the services of the operating system to the user programs via Application Program Interfaces or APIs. It provides an interface between a process and operating system. System calls are the only entry points into the kernel system. All …

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Studying Operating Systems and UNIX

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  • Being a core topic, it is expected to weigh in heavily on the exam pattern. That said, we generally see that the topics can be handled well. The mathematical questions from the topics like scheduling and paging are particularly scoring.
  • The only drawback is that such questions can tend to be time consuming. On the Unix section, we usually expect one or two questions in a normal paper.
  • Chances are that the standard commands can be asked directly or there can be a tougher question asking to integrate the outputs of several commands.
  • However, the commands could come from outside the syllabus as well.

Learning Op…

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