/**
* Method to install a signal handler.
*
* @param integer $signal The signal number.
* @param callable $handler The signal handler which may be the name of a user created function,
* or method, or either of the two global constants SIG_IGN or SIG_DFL.
* @param boolean $restart Specifies whether system call restarting should be used when this
* signal arrives.
*
* @return boolean True on success.
*
* @see pcntl_signal()
* @since 1.7.3
*/
protected function pcntlSignal($signal, $handler, $restart = true)
{
return pcntl_signal($signal, $handler, $restart);
}