Does Node.js "new Socket" create a Unix file socket?

Question

I've been working with node.js for the past couple of weeks and I need to implement the FAST-CGI protocol. The problem is that when I create a UNIX socket (via "new Socket") I need to get the filename, or file descriptor. But socket.fd is null (default parameter).

My question is: Does "new Socket" creates a operating system socket object file, and if so, how can I get the Socket File Descriptor or File Name?

I'm not sure if this is how I should create a Socket, but here is the case:
node:

var net = require(net)
var socket = new net.Socket()
console.log(socket);

{
 bufferSize: 0,
 fd:null,
 type: null,
 allowHalfOpen: false,
 _writeImpl: [Function],
 _readImpl: [Function],
 _shutdownImpl: [Function]
}

Yeah, exactly, socket.fd is empty until you actually do socket.connect() ;) — usoban
– usoban, Commented Sep 23, 2011 at 16:07
Oohhh.... So the actual system socket is created when connect is called.But when i call socket.connect('/tmp/file.sock') it gives me (Error: ENOENT, No such file or directory)... Should I create the file before ? or what should I do ? — user961357
– user961357, Commented Sep 23, 2011 at 16:46
Yes, you should. Also, as I noted in my answer below, FD can be given when creating new socket: new net.Socket({fd : '/tmp/file.sock'}) — usoban
– usoban, Commented Sep 23, 2011 at 17:06
It turns out, that you should only specify the existing file descriptor of socket, and it should be a number (fd:NaN)... So how do I create the file ? Should I use fs.open ??? — user961357
– user961357, Commented Sep 23, 2011 at 17:18
Yeah, fs.open is the way. I appended the code to my answer below. Works for me on Ubuntu (with node 0.4.11) — usoban
– usoban, Commented Sep 23, 2011 at 17:30

usoban · Accepted Answer · 2011-09-23 17:29:47Z

7

Well when you connect a socket, socket.fd is not null, at least not in my case, so provide an example case please.

Note that you can also specify existing file descriptor at socket creation.

Edit:

var net = require('net'),
    fs = require('fs'),
    sock;

// Create socket file
fs.open('/tmp/node.test.sock', 'w+', function(err, fdesc){
    if (err || !fdesc) {
        throw 'Error: ' + (err || 'No fdesc');
    }

    // Create socket
    sock = new net.Socket({ fd : fdesc });
    console.log(sock);
});

edited Sep 23, 2011 at 17:29

answered Sep 23, 2011 at 15:16

usoban

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1 Comment

ccnokes Over a year ago

This doesn't work anymore, it says "Unsupported fd type: FILE". :(

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