GATE CSE 2023 Q23: Events that guarantee a switch from user to kernel mode

Which one or more of the following options guarantee that a computer system will transition from user mode to kernel mode?

Try it: multiple select: one or more correct options

Select all correct options. No negative marking, no partial marks.

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Answer: C, D (official GATE 2023 final answer key)

Concept used: Traps (system calls) and exceptions (faults) enter the kernel; ordinary library calls need not.

First step: Ask whether malloc can be served entirely from memory the process already has.

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Source: official GATE 2023 CS question paper and final answer key, organised by IIT Kanpur. Question paper · Answer key