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aio_notify: fix _POSIX_REALTIME_SIGNALS check
Check that _POSIX_REALTIME_SIGNALS is greater than zero to assume realtime signals are supported, instead of any non-zero value (including -1).
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@ -95,7 +95,7 @@ __aio_notify_only (struct sigevent *sigev)
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else if (sigev->sigev_notify == SIGEV_SIGNAL)
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{
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/* We have to send a signal. */
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#if _POSIX_REALTIME_SIGNALS
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#if _POSIX_REALTIME_SIGNALS > 0
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/* Note that the standard gives us the option of using a plain
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non-queuing signal here when SA_SIGINFO is not set for the signal. */
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# ifdef BROKEN_THREAD_SIGNALS
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