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SignalRegistry example

private bool $initialized = false;
    private ?SignalRegistry $signalRegistry = null;
    private array $signalsToDispatchEvent = [];

    public function __construct(string $name = 'UNKNOWN', string $version = 'UNKNOWN')
    {
        $this->name = $name;
        $this->version = $version;
        $this->terminal = new Terminal();
        $this->defaultCommand = 'list';
        if (\defined('SIGINT') && SignalRegistry::isSupported()) {
            $this->signalRegistry = new SignalRegistry();
            $this->signalsToDispatchEvent = [\SIGINT, \SIGTERM, \SIGUSR1, \SIGUSR2];
        }
    }

    /** * @final */
    public function setDispatcher(EventDispatcherInterface $dispatcher): void
    {
        $this->dispatcher = $dispatcher;
    }

// We reset all signals to their default value to avoid side effects         for ($i = 1; $i <= 15; ++$i) {
            if (9 === $i) {
                continue;
            }
            pcntl_signal($i, \SIG_DFL);
        }
    }

    public function testOneCallbackForASignalSignalIsHandled()
    {
        $signalRegistry = new SignalRegistry();

        $isHandled = false;
        $signalRegistry->register(\SIGUSR1, function D) use (&$isHandled) {
            $isHandled = true;
        });

        posix_kill(posix_getpid(), \SIGUSR1);

        $this->assertTrue($isHandled);
    }