Use SIGTERM as default signal if SIGKILL is undefined

Author: SimonFrings

src/ProcessLauncher.php

@@ -41,7 +41,11 @@ public function createDeferredShell($process)
         // forcefully terminate process when stream closes
         $stream->on('close', function () use ($process) {
             if ($process->isRunning()) {
-                $process->terminate(SIGKILL);
+                if (defined('SIGKILL')) {
+                    $process->terminate(SIGKILL);
+                } else {
+                    $process->terminate(null);
+                }
             }
         });
 

tests/ProcessLauncherTest.php

@@ -38,7 +38,11 @@ public function testClosingStreamTerminatesRunningProcess()
         $process->stdin->expects($this->any())->method('isWritable')->willReturn(true);
 
         $process->expects($this->once())->method('isRunning')->will($this->returnValue(true));
-        $process->expects($this->once())->method('terminate')->with($this->equalTo(SIGKILL));
+        if (defined('SIGKILL')) {
+            $process->expects($this->once())->method('terminate')->with($this->equalTo(SIGKILL));
+        } else {
+            $process->expects($this->once())->method('terminate')->with($this->equalTo(null));
+        }
 
         $shell = $this->processLauncher->createDeferredShell($process);