Wednesday, April 29, 2020

Operating Systems Question Bank with Answers 08

What is the purpose of system calls in OS? What is the mechanism used to implement system calls?


What is the purpose of a system call? What mechanism is typically used to implement system calls?

System calls are part of most modern operating systems.

A system call is the means by which an application (user-space process) can invoke services within the operating system.

They are typically implemented by using software interrupts or traps: hardware supported instructions which transfer control to a well-defined entry point in the operating system, switching the processor mode to ”privileged" in the process.

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