lib/Process.php
public function signal(int $signo)
    {
        if (!$this->isRunning()) {
            throw new StatusError("Process is not running.");
        }

        $this->processRunner->signal($this->handle, $signo);
    }
public function signal(int $signo)
    {
        if (!$this->isRunning()) {
            throw new StatusError("Process is not running.");
        }

        $this->processRunner->signal($this->handle, $signo);
    }
Send a signal signal to the process.

@param int $signo Signal number to send to process.

@throws StatusError If the process is not running.
@throws ProcessException If sending the signal fails.