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Which of the following macro returns true if the file type is a directory?

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Which of the following macro returns true if the file type is a directory?

(a) S_ISREG

(b) S_ISDIR

(c) S_ISCHR

(d) S_ISFIFO

This question was addressed to me during an interview.

The origin of the question is File Handling System Calls topic in chapter System Programming I – Files of Unix

1 Answer

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Best answer
Right option is (b) S_ISDIR

Explanation: The S_ISDIR macro returns true if the file type is a directory. The S_ISREG returns true if the file type is regular.

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