[Process] Fix for #8754 (Timed-out processes are successful)

src/Symfony/Component/Process/Process.php

@@ -646,9 +646,9 @@ class Process
         $timeoutMicro = microtime(true) + $timeout;
         if ($this->isRunning()) {
             proc_terminate($this->process);
-            while ($this->isRunning() && microtime(true) < $timeoutMicro) {
+            do {
                 usleep(1000);
-            }
+            } while ($this->isRunning() && microtime(true) < $timeoutMicro);
 
             if ($this->isRunning() && !$this->isSigchildEnabled()) {
                 if (null !== $signal || defined('SIGKILL')) {

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

@@ -444,6 +444,7 @@ abstract class AbstractProcessTest extends \PHPUnit_Framework_TestCase
         $duration = microtime(true) - $start;
 
         $this->assertLessThan($timeout + $precision, $duration);
+        $this->assertFalse($process->isSuccessful());
     }
 
     public function testGetPid()

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

@@ -61,6 +61,14 @@ class SigchildDisabledProcessTest extends AbstractProcessTest
         parent::testProcessWithoutTermSignal();
     }
 
+    /**
+     * @expectedException \Symfony\Component\Process\Exception\RuntimeException
+     */
+    public function testCheckTimeoutOnStartedProcess()
+    {
+        parent::testCheckTimeoutOnStartedProcess();
+    }
+
     /**
      * @expectedException \Symfony\Component\Process\Exception\RuntimeException
      */