[Console] Add signal event

Author: noniagriconomie

components/console/events.rst

@@ -155,3 +155,20 @@ Listeners receive a
     The exit code received in this case is the exception code.
 
 .. _`reserved exit codes`: https://www.tldp.org/LDP/abs/html/exitcodes.html
+
+The ``ConsoleEvents::SIGNAL`` Event
+-----------------------------------
+
+**Typical Purposes**: To handle some signals for all application commands.
+
+Listeners receive a
+:class:`Symfony\\Component\\Console\\Event\\ConsoleSignalEvent` event::
+
+    use Symfony\Component\Console\ConsoleEvents;
+    use Symfony\Component\Console\Event\ConsoleSignalEvent;
+
+    $dispatcher->addListener(ConsoleEvents::SIGNAL, function (ConsoleSignalEvent $event) {
+        $signal = $event->getHandlingSignal();
+
+        // ...
+    });

console.rst

@@ -427,6 +427,50 @@ call ``setAutoExit(false)`` on it to get the command result in ``CommandTester``
     :class:`Symfony\\Component\\Console\\Application <Symfony\\Component\\Console\\Application>`
     and extend the normal ``\PHPUnit\Framework\TestCase``.
 
+Command Reacting to Signal
+--------------------------
+
+.. versionadded:: 5.2
+
+    The :class:`Symfony\\Component\\Console\\Command\\SignalableCommandInterface` interface
+    for reacting to signals was introduced in Symfony 5.2.
+
+You can make your commands react to signals by implementing the ``SignalableCommandInterface`` interface::
+
+    // ...
+    
+    use Symfony\Component\Console\Command\Command;
+    use Symfony\Component\Console\Command\SignalableCommandInterface;
+
+    class MyCommand extends Command implements SignalableCommandInterface
+    {
+        // ...
+
+        public function getSubscribedSignals(): array
+        {
+            // constants defined by PCNTL extension
+            // https://www.php.net/manual/en/pcntl.constants.php
+            return [SIGINT, SIGTERM];
+        }
+
+        public function handleSignal(int $signal): void
+        {
+            if (SIGINT === $signal) {
+                // handle SIGINT signal
+            }
+
+            // handle SIGTERM signal
+        }
+
+        protected function execute(InputInterface $input, OutputInterface $output): int
+        {
+            // ...
+            // your normal command execution flow
+
+            return Command::SUCCESS;
+        }
+    }
+
 Logging Command Errors
 ----------------------