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<?php
namespace Illuminate\Console;
/**
* @internal
*/
class Signals
{
/**
* The signal registry instance.
*
* @var \Symfony\Component\Console\SignalRegistry\SignalRegistry
*/
protected $registry;
/**
* The signal registry's previous list of handlers.
*
* @var array<int, array<int, callable>>|null
*/
protected $previousHandlers;
/**
* The current availability resolver, if any.
*
* @var (callable(): bool)|null
*/
protected static $availabilityResolver;
/**
* Create a new signal registrar instance.
*
* @param \Symfony\Component\Console\SignalRegistry\SignalRegistry $registry
* @return void
*/
public function __construct($registry)
{
$this->registry = $registry;
$this->previousHandlers = $this->getHandlers();
}
/**
* Register a new signal handler.
*
* @param int $signal
* @param callable(int $signal): void $callback
* @return void
*/
public function register($signal, $callback)
{
$this->previousHandlers[$signal] ??= $this->initializeSignal($signal);
with($this->getHandlers(), function ($handlers) use ($signal) {
$handlers[$signal] ??= $this->initializeSignal($signal);
$this->setHandlers($handlers);
});
$this->registry->register($signal, $callback);
with($this->getHandlers(), function ($handlers) use ($signal) {
$lastHandlerInserted = array_pop($handlers[$signal]);
array_unshift($handlers[$signal], $lastHandlerInserted);
$this->setHandlers($handlers);
});
}
/**
* Gets the signal's existing handler in array format.
*
* @return array<int, callable(int $signal): void>
*/
protected function initializeSignal($signal)
{
return is_callable($existingHandler = pcntl_signal_get_handler($signal))
? [$existingHandler]
: null;
}
/**
* Unregister the current signal handlers.
*
* @return array<int, array<int, callable(int $signal): void>>
*/
public function unregister()
{
$previousHandlers = $this->previousHandlers;
foreach ($previousHandlers as $signal => $handler) {
if (is_null($handler)) {
pcntl_signal($signal, SIG_DFL);
unset($previousHandlers[$signal]);
}
}
$this->setHandlers($previousHandlers);
}
/**
* Execute the given callback if "signals" should be used and are available.
*
* @param callable $callback
* @return void
*/
public static function whenAvailable($callback)
{
$resolver = static::$availabilityResolver;
if ($resolver()) {
$callback();
}
}
/**
* Get the registry's handlers.
*
* @return array<int, array<int, callable>>
*/
protected function getHandlers()
{
return (fn () => $this->signalHandlers)
->call($this->registry);
}
/**
* Set the registry's handlers.
*
* @param array<int, array<int, callable(int $signal):void>> $handlers
* @return void
*/
protected function setHandlers($handlers)
{
(fn () => $this->signalHandlers = $handlers)
->call($this->registry);
}
/**
* Set the availability resolver.
*
* @param callable(): bool
* @return void
*/
public static function resolveAvailabilityUsing($resolver)
{
static::$availabilityResolver = $resolver;
}
}