Fix POSIX compatible bug for sigwaitinfo and sigtimedwait. POSIX says siginfo pointer parameter can be NULL and if the function success, it should return signal number but not zero. The waitset it past should be negatived before it can be used as thread signal mask.
Fix POSIX compatible bug for sigwaitinfo and sigtimedwait.
POSIX says siginfo pointer parameter can be NULL and if the
function success, it should return signal number but not zero.
The waitset it past should be negatived before it can be
used as thread signal mask.

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