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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <[email protected]>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\Console\SignalRegistry;
  13  
  14  final class SignalRegistry
  15  {
  16      private $signalHandlers = [];
  17  
  18      public function __construct()
  19      {
  20          if (\function_exists('pcntl_async_signals')) {
  21              pcntl_async_signals(true);
  22          }
  23      }
  24  
  25      public function register(int $signal, callable $signalHandler): void
  26      {
  27          if (!isset($this->signalHandlers[$signal])) {
  28              $previousCallback = pcntl_signal_get_handler($signal);
  29  
  30              if (\is_callable($previousCallback)) {
  31                  $this->signalHandlers[$signal][] = $previousCallback;
  32              }
  33          }
  34  
  35          $this->signalHandlers[$signal][] = $signalHandler;
  36  
  37          pcntl_signal($signal, [$this, 'handle']);
  38      }
  39  
  40      public static function isSupported(): bool
  41      {
  42          if (!\function_exists('pcntl_signal')) {
  43              return false;
  44          }
  45  
  46          if (\in_array('pcntl_signal', explode(',', ini_get('disable_functions')))) {
  47              return false;
  48          }
  49  
  50          return true;
  51      }
  52  
  53      /**
  54       * @internal
  55       */
  56      public function handle(int $signal): void
  57      {
  58          $count = \count($this->signalHandlers[$signal]);
  59  
  60          foreach ($this->signalHandlers[$signal] as $i => $signalHandler) {
  61              $hasNext = $i !== $count - 1;
  62              $signalHandler($signal, $hasNext);
  63          }
  64      }
  65  }