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Commit 9abb2bfc left behind code to block signals inside signal handlers on Windows, because our signal porting layer didn't have sigaction(). Provide a minimal implementation that is capable of blocking signals, to get rid of platform differences. See also related commit c94ae9d8. Discussion: https://postgr.es/m/CA%2BhUKGKKKfcgx6jzok9AYenp2TNti_tfs8FMoJpL8%2B0Gsy%3D%3D_A%40mail.gmail.com