check for function availability before trying to restart

application/core/ManiaControl.php

@@ -246,11 +246,20 @@ class ManiaControl implements CommandListener, TimerListener {
 		$this->log('Restarting ManiaControl!');
 
 		// Execute start script in background
-		// TODO: restart the .php script itself ($_SERVER['scriptname'] or something + $argv)
 		if (SystemUtil::isUnix()) {
+			// Unix
+			if (!SystemUtil::checkFunctionAvailability('exec')) {
+				$this->log("Can't restart ManiaControl because the function 'exec' is disabled!");
+				return;
+			}
 			$command = 'sh ' . escapeshellarg(ManiaControlDir . 'ManiaControl.sh') . ' > /dev/null &';
 			exec($command);
 		} else {
+			// Windows
+			if (!SystemUtil::checkFunctionAvailability('system')) {
+				$this->log("Can't restart ManiaControl because the function 'system' is disabled!");
+				return;
+			}
 			$command = escapeshellarg(ManiaControlDir . "ManiaControl.bat");
 			system($command); // TODO: windows gets stuck here as long controller is running
 		}

application/core/Utils/SystemUtil.php

@@ -45,4 +45,24 @@ class SystemUtil {
 	public static function isUnix() {
 		return (self::getOS() === self::OS_UNIX);
 	}
+
+	/**
+	 * Check whether the given Function is available
+	 *
+	 * @param string $functionName
+	 * @return bool
+	 */
+	public static function checkFunctionAvailability($functionName) {
+		return (function_exists($functionName) && !in_array($functionName, self::getDisabledFunctions()));
+	}
+
+	/**
+	 * Get the Array of Disabled Functions
+	 *
+	 * @return array
+	 */
+	public static function getDisabledFunctions() {
+		$disabledText = ini_get('disable_functions');
+		return explode(',', $disabledText);
+	}
 }