Q14

MSQ1 mark

Which of the following standard $C$ library functions will always invoke a system call when executed from a single-threaded process in a $\text{UNIX/Linux}$ operating system?

(A)

$\textsf{exit}$

(B)

$\textsf{malloc}$

(C)

$\textsf{sleep}$

(D)

$\textsf{strlen}$

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