What is the main function of a system-level call designed to write data to the…
2025
What is the main function of a system-level call designed to write data to the console device (e.g., WriteConsole on some platforms)?
Answer: D. It sends a sequence of characters or bytes from a user buffer to the console for display. — System-level output functions like WriteConsole() are used to display text on the console screen. The program provides a buffer containing characters or…
- A.
It closes the console device handle after output.
- B.
It captures keystrokes from the keyboard and stores them in a buffer.
- C.
It modifies the process's memory layout to include console buffers.
- D.
It sends a sequence of characters or bytes from a user buffer to the console for display.
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Correct answer: D
System-level output functions like WriteConsole() are used to display text on the console screen. The program provides a buffer containing characters or bytes, and the operating system writes that data to the console device.
Typical process:
Program prepares output data.
WriteConsole() is called with:
console handle
buffer address
number of characters
Operating system displays the data on the console.
WriteConsole(hConsole, "Hello", 5, &written, NULL);
This writes the string "Hello" to the console.