[process] Added destructor to process to make sure handles are always closed in the right order.

src/Symfony/Component/Process/Process.php

@@ -133,6 +133,12 @@ class Process
         $this->options = array_replace(array('suppress_errors' => true, 'binary_pipes' => true), $options);
     }
 
+    public function __destruct()
+    {
+        // stop() will check if we have a process running.
+        $this->stop();
+    }
+
     /**
      * Runs the process.
      *

src/Symfony/Component/Process/Tests/ProcessTest.php

@@ -121,6 +121,18 @@ class ProcessTest extends \PHPUnit_Framework_TestCase
         }
     }
 
+    public function testPhpDeadlock()
+    {
+        $this->markTestSkipped('Can course php to hang');
+
+        // Sleep dont work as it will allow the process to handle signals and close
+        // file handles from the other end.
+        $process = new Process('php -r "while (true) {}"');
+        $process->start();
+
+        // PHP will deadlock when it tries to cleanup $process
+    }
+
     public function responsesCodeProvider()
     {
         return array(