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In UNIX, what will the open system call return?

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In UNIX, what will the open system call return?

(a) pointer to the entry in the open file table

(b) pointer to the entry in the system wide table

(c) a file to the process calling it

(d) none of the mentioned

I have been asked this question at a job interview.

This interesting question is from File System Interface Access Methods in portion File Systems and their Implementation of Operating System

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Correct answer is (a) pointer to the entry in the open file table

Best explanation: None.

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