507      * @param int $signal A valid POSIX signal (see https://php.net/pcntl.constants)
515     public function signal(int $signal)  function in Symfony\\Component\\Process\\Process
517         $this->doSignal($signal, true);
914 …* @param int|null  $signal  A POSIX signal to send in case the process has not stop at timeout, de…
918     public function stop(float $timeout = 10, ?int $signal = null)  argument
931                 $this->doSignal($signal ?: 9, false);
939                 return $this->stop(0, $signal);
1505      * @param int  $signal         A valid POSIX signal (see https://php.net/pcntl.constants)
1512     private function doSignal(int $signal, bool $throwException): bool  argument
1533                 $ok = @proc_terminate($this->process, $signal);
1535                 $ok = @posix_kill($pid, $signal);
1536 …  } elseif ($ok = proc_open(sprintf('kill -%d %d', $signal, $pid), [2 => ['pipe', 'w']], $pipes)) {
1541 …                  throw new RuntimeException(sprintf('Error while sending signal "%s".', $signal));
1548         $this->latestSignal = $signal;