pidfile.php is in use by two addons. So we restore it here.

include/pidfile.php

@@ -0,0 +1,41 @@
+<?php
+class pidfile {
+	private $_file;
+	private $_running;
+
+	public function __construct($dir, $name) {
+		$this->_file = "$dir/$name.pid";
+
+		if (file_exists($this->_file)) {
+			$pid = trim(@file_get_contents($this->_file));
+			if (($pid != "") AND posix_kill($pid, 0)) {
+				$this->_running = true;
+			}
+		}
+
+		if (! $this->_running) {
+			$pid = getmypid();
+			file_put_contents($this->_file, $pid);
+		}
+	}
+
+	public function __destruct() {
+		if ((! $this->_running) && file_exists($this->_file)) {
+			@unlink($this->_file);
+		}
+	}
+
+	public function is_already_running() {
+		return $this->_running;
+	}
+
+	public function running_time() {
+		return(time() - @filectime($this->_file));
+	}
+
+	public function kill() {
+		if (file_exists($this->_file))
+			return(posix_kill(file_get_contents($this->_file), SIGTERM));
+	}
+}
+?>