_WSTATUS - FreeBSD

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#define WIFSTOPPED(x) (_WSTATUS(x) == _WSTOPPED)

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#define WIFSIGNALED(x) (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0 && (x) != 0x13)

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#define WTERMSIG(x) (_WSTATUS(x))

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#define WIFEXITED(x) (_WSTATUS(x) == 0)