First actual commit

index.js

@@ -0,0 +1,24 @@
+var fs      = require('fs-extra');
+var running = require('running');
+
+module.exports = {
+  lock: function(name, callback) {
+    var filename = '/var/run/' + name + '.pid';
+
+    // Checks if PID file exists
+    if (fs.existsSync(filename)) {
+      // Checks if the PID is still active
+      var pid = fs.readFileSync(filename, 'utf8');
+
+      if (running(pid)) {
+        console.log('PID ' + pid + ' found in ' + filename + ' is running.');
+        process.exit(1);
+      }
+    }
+
+    // Writes the PID
+    fs.writeFileSync(filename, process.pid);
+
+    callback && callback();
+  }
+};