[warn] sigaction: Invalid argument

[dshemin]

Got this warning when trying to setup signal event, code sample:

$base = event_base_new();
$signalEvent = event_new();
event_set($signalEvent, SIGUSR1, EV_SIGNAL | EV_PERSIST, function () {
    echo 'Got signal'. PHP_EOL;
});
event_base_set($signalEvent, $base);
event_add($signalEvent);
event_base_loop($base);

Try it in Docker containers php7.0 and php7.0-zts, both based on Debian Jessie.