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Corinna Vinschen cb1469277a Cygwin: fix potential SEGV in sigwaitinfo/signalfd scenario
On sigwaitinfo or reading from a signalfd, signal processing sets up
signal handling via sigdelayed even if the handler address is NULL.
This doesn't have any impact on sigwaitinfo scenarios (or at least, I
wasn't able to come up with a reproducer) but it breaks signalfd
scenarios, where eventually a call to call_signal_handler from
sigdelayed will try to call the NULL function.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2020-10-14 10:53:58 -04:00
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