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vendor/symfony/console/SignalRegistry/SignalMap.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;
+
+/**
+ * @author Grégoire Pineau <lyrixx@lyrixx.info>
+ */
+class SignalMap
+{
+    private static array $map;
+
+    public static function getSignalName(int $signal): ?string
+    {
+        if (!\extension_loaded('pcntl')) {
+            return null;
+        }
+
+        if (!isset(self::$map)) {
+            $r = new \ReflectionExtension('pcntl');
+            $c = $r->getConstants();
+            $map = array_filter($c, fn ($k) => str_starts_with($k, 'SIG') && !str_starts_with($k, 'SIG_') && 'SIGBABY' !== $k, \ARRAY_FILTER_USE_KEY);
+            self::$map = array_flip($map);
+        }
+
+        return self::$map[$signal] ?? null;
+    }
+}

vendor/symfony/console/SignalRegistry/SignalRegistry.php

@@ -0,0 +1,108 @@
+<?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
+{
+    /**
+     * @var array<int, array<callable>>
+     */
+    private array $signalHandlers = [];
+
+    /**
+     * @var array<array<int, array<callable>>>
+     */
+    private array $stack = [];
+
+    /**
+     * @var array<int, callable|int|string>
+     */
+    private array $originalHandlers = [];
+
+    public function __construct()
+    {
+        if (\function_exists('pcntl_async_signals')) {
+            pcntl_async_signals(true);
+        }
+    }
+
+    public function register(int $signal, callable $signalHandler): void
+    {
+        $previous = pcntl_signal_get_handler($signal);
+
+        if (!isset($this->originalHandlers[$signal])) {
+            $this->originalHandlers[$signal] = $previous;
+        }
+
+        if (!isset($this->signalHandlers[$signal])) {
+            if (\is_callable($previous) && [$this, 'handle'] !== $previous) {
+                $this->signalHandlers[$signal][] = $previous;
+            }
+        }
+
+        $this->signalHandlers[$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);
+        }
+    }
+
+    /**
+     * Pushes the current active handlers onto the stack and clears the active list.
+     *
+     * This prepares the registry for a new set of handlers within a specific scope.
+     *
+     * @internal
+     */
+    public function pushCurrentHandlers(): void
+    {
+        $this->stack[] = $this->signalHandlers;
+        $this->signalHandlers = [];
+    }
+
+    /**
+     * Restores the previous handlers from the stack, making them active.
+     *
+     * This also restores the original OS-level signal handler if no
+     * more handlers are registered for a signal that was just popped.
+     *
+     * @internal
+     */
+    public function popPreviousHandlers(): void
+    {
+        $popped = $this->signalHandlers;
+        $this->signalHandlers = array_pop($this->stack) ?? [];
+
+        // Restore OS handler if no more Symfony handlers for this signal
+        foreach ($popped as $signal => $handlers) {
+            if (!($this->signalHandlers[$signal] ?? false) && isset($this->originalHandlers[$signal])) {
+                pcntl_signal($signal, $this->originalHandlers[$signal]);
+            }
+        }
+    }
+}