Node.js中定义的`listen`函数在哪里？

Question

I'm poking around the Node.js internals, and I came across the following method definition

//File: node/lib/net.js
Socket.prototype.listen = function() {
  debug('socket.listen');
  var self = this;
  self.on('connection', arguments[0]);
  listen(self, null, null, null);
};

Within the Socket object's listen method, there's a call to a (seemingly) global function, also named listen .

listen(self, null, null, null);

Where is this javascript method/function defined? I've scoured all the javascript files in the code-base and can't seem to find it.

(There's no specific task I'm trying to accomplish here, other than tracing node's execution path and trying to understand the patterns in use deep in the system.)

Answer 1

https://github.com/joyent/node/blob/b80d11d46b3b2abff1cf1fe887971ea50fd7d497/lib/net.js#L1088

It's just a function declared lower in the file, which is OK in javascript due to function hoisting.

Answer 2

It's defined farther down in net.js . As of 0.11.5, it's at line 1089 :

function listen(self, address, port, addressType, backlog, fd) {
  if (!cluster) cluster = require('cluster');    

  if (cluster.isMaster) {
    self._listen2(address, port, addressType, backlog, fd);
    return;
  }

  // ...
}