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What is the type declared by the header file signal.h?

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What is the type declared by the header file signal.h?

(a) sig_atomic_t

(b) sig_signal_t

(c) sig_signal_h

(d) sig_stomic_h

I had been asked this question during a job interview.

I need to ask this question from Signal Handling topic in chapter C Library of C

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The correct answer is (a) sig_atomic_t

The explanation is: The only type declared in signal.h is sig_atomic_h.

This is of int type and used as a variable in signal handling.

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