Reworked the DaemonCommand.

* Accepts options for PID and log file.
* Uses posix_kill whenever available.
* Checks that the daemon actually started or stopped.
* Try to terminate then kill the daemon.
* Uses the logger or output instead of "echo".

Added a ProcessControl interface and implementations.

Closed #908

PHPCI/ProcessControl/WindowsProcessControl.php

@@ -0,0 +1,54 @@
+<?php
+/**
+ * PHPCI - Continuous Integration for PHP
+ *
+ * @copyright    Copyright 2015, Block 8 Limited.
+ * @license      https://github.com/Block8/PHPCI/blob/master/LICENSE.md
+ * @link         https://www.phptesting.org/
+ */
+
+namespace PHPCI\ProcessControl;
+
+/**
+ * Control processes using the "tasklist" and "taskkill" commands.
+ *
+ * @author Adirelle <adirelle@gmail.com>
+ */
+class WindowsProcessControl implements ProcessControlInterface
+{
+    /**
+     * Check if the process is running using the "tasklist" command.
+     *
+     * @param type $pid
+     * @return bool
+     */
+    public function isRunning($pid)
+    {
+        $lastLine = exec(sprintf('tasklist /fi "PID eq %d" /nh /fo csv 2>nul:', $pid));
+        $record = str_getcsv($lastLine);
+        return isset($record[1]) && intval($record[1]) === $pid;
+    }
+
+    /**
+     * Terminate the process using the "taskkill" command.
+     *
+     * @param type $pid
+     * @param bool $forcefully
+     */
+    public function kill($pid, $forcefully = false)
+    {
+        exec(sprintf("taskkill /t /pid %d %s 2>nul:", $pid, $forcefully ? '/f' : ''));
+    }
+
+    /**
+     * Check whether the commands "tasklist" and "taskkill" are available.
+     *
+     * @return bool
+     *
+     * @internal
+     */
+    public static function isAvailable()
+    {
+        return DIRECTORY_SEPARATOR === '\\' && exec("where tasklist") && exec("where taskkill");
+    }
+}