Question

Which of the following system calls returns one or more file descriptors?

(a) dup, dup2

(b) fcntl

(c) pipe

(d) dup, dup2, fcntl and pipe

I have been asked this question by my school teacher while I was bunking the class.

The above asked question is from Process Control System Calls in section System Programming II – Process Control & Unix System Performance of Unix

Answer 1

The correct choice is (d) dup, dup2, fcntl and pipe

The explanation: dup, dup2, fcntl and pipe are the system calls which returns one or more file descriptors when invoked.