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System calls and library functions are same.

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System calls and library functions are same.

(a) True

(b) False

This question was addressed to me at a job interview.

I'm obligated to ask this question of File Handling System Calls in portion System Programming I – Files of Unix

1 Answer

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The correct choice is (b) False

Easy explanation: System calls are built into the kernel, but library functions are built on top of them. When a system call is invoked, the pre-processor switches to kernel mode and returns to the user mode when the call completes.

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