protected function registerSignals()
{
foreach (self::$signals as $no => $name) {
if ($name === 'SIGKILL' || $name == 'SIGSTOP') {
continue;
}
if (!\pcntl_signal($no, [$this, 'sighandler'], true)) {
$this->log('Cannot assign ' . $name . ' signal');
}
}
}