New script that checks if a script is running

diff --git a/include/pidfile.php b/include/pidfile.php
new file mode 100644 (file)
index 0000000..47df8d1
--- /dev/null
+++ b/include/pidfile.php
@@ -0,0 +1,32 @@
+<?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 (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;
+       }
+}
+?>