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vendor/symfony/console/SignalRegistry/SignalRegistry.php

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