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Which of the following mode is used for opening a file in both reading and writing?

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Which of the following mode is used for opening a file in both reading and writing?

(a) O_RDONLY

(b) O_WRONLY

(c) O_RDWR

(d) O_WDR

This question was addressed to me in an international level competition.

Question is from System Calls Basics in chapter System Programming I – Files of Unix

1 Answer

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Correct answer is (c) O_RDWR

The explanation is: There are three modes of opening a file namely:

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