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148 lars 1 
<?php
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/*
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 * This file is part of the Symfony package.
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 *
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 * (c) Fabien Potencier <fabien@symfony.com>
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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namespace Symfony\Component\Console\SignalRegistry;
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final class SignalRegistry
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{
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    private array $signalHandlers = [];
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    public function __construct()
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    {
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        if (\function_exists('pcntl_async_signals')) {
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            pcntl_async_signals(true);
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        }
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    }
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    public function register(int $signal, callable $signalHandler): void
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    {
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        if (!isset($this->signalHandlers[$signal])) {
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            $previousCallback = pcntl_signal_get_handler($signal);
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            if (\is_callable($previousCallback)) {
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                $this->signalHandlers[$signal][] = $previousCallback;
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            }
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        }
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        $this->signalHandlers[$signal][] = $signalHandler;
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        pcntl_signal($signal, $this->handle(...));
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    }
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    public static function isSupported(): bool
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    {
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        return \function_exists('pcntl_signal');
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    }
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    /**
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     * @internal
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     */
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    public function handle(int $signal): void
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    {
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        $count = \count($this->signalHandlers[$signal]);
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        foreach ($this->signalHandlers[$signal] as $i => $signalHandler) {
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            $hasNext = $i !== $count - 1;
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            $signalHandler($signal, $hasNext);
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        }
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    }
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}