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CIL 2026 | System | Question: 31

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What does the $\mathrm{read}()$ system call in an operating system do?

  1. Blocks until the requested number of bytes is read
  2. Copies data directly from device hardware into user space without kernel intervention
  3. Runs entirely in user mode for performance
  4. Copies data from kernel space to user space, possibly after reading from device buffers

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