public function signal($signal)
    {
        $pid = null === $this->ppid ? $this->pid : $this->ppid;

        return posix_kill($pid, $signal);
    }
public function signal($signal)
    {
        $pid = null === $this->ppid ? $this->pid : $this->ppid;

        return posix_kill($pid, $signal);
    }
public function signal ( $ signal ) { $ pid = null === $ this -> ppid ? $ this -> pid : $ this -> ppid ; return posix_kill ( $ pid , $ signal ) ; }
Sends a signal to the other process.
Sends a signal to the other process .