What does WEXITSTATUS(status) return?

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I am trying to understand how WEXITSTATUS(status) works. I have come across a piece of code where the return value of WEXITSTATUS(status) is being added to a variable.

Here is the snippet:

waitpid(-1, &status, 0);
counter += WEXITSTATUS(status);

How can the return value of WEXITSTATUS be calculated?

signals posix unix fork c
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