Unverified50% confidenceFactExact time
Modern operating systems use the privilege-level mechanism provided by the CPU to divide the execution environment into user mode and kernel mode; user-mode programs run at a restricted privilege level and cannot directly access hardware or arbitrary memory; when they need services such as file read/write, network communication, or process management, they must trap into the kernel via a system call (syscall), and the kernel executes it on their behalf.
1
Sources
50%
Confidence
Long-term
Relevance
10/15/2026
First Seen
Sources
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Related Claims
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