SignalRegistry.php
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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);
	}
	}

	/**
	* @internal
	*/
	public function scheduleAlarm(int $seconds): void
	{
	pcntl_alarm($seconds);
	}
	}