ok($nbsig, 'Sigfd->new SFD_NONBLOCK works');
is($nbsig->wait_once, undef, 'nonblocking ->wait_once');
ok($! == Errno::EAGAIN, 'got EAGAIN');
kill('HUP', $$) or die "kill $!";
PublicInbox::DS->SetPostLoopCallback(sub {}); # loop once
ok($nbsig, 'Sigfd->new SFD_NONBLOCK works');
is($nbsig->wait_once, undef, 'nonblocking ->wait_once');
ok($! == Errno::EAGAIN, 'got EAGAIN');
kill('HUP', $$) or die "kill $!";
PublicInbox::DS->SetPostLoopCallback(sub {}); # loop once