node/test/simple/test-dgram-unix-anon.js

common = require("../common");
assert = common.assert

var Buffer = require("buffer").Buffer,
    fs = require("fs"),
    dgram = require("dgram"), server, client,
    server_path = "/tmp/dgram_server_sock",
    messages_to_send = [
      new Buffer("First message to send"),
      new Buffer("Second message to send"),
      new Buffer("Third message to send"),
      new Buffer("Fourth message to send")
    ],
    timer;

server = dgram.createSocket("unix_dgram");
server.bind(server_path);
server.messages = [];
server.on("message", function (msg, rinfo) {
  console.log("server got: " + msg);
  assert.strictEqual(rinfo.address, ""); // anon client sending
  server.messages.push(msg.toString());
  if (server.messages.length === messages_to_send.length) {
      server.messages.forEach(function (m, i) {
      assert.strictEqual(m, messages_to_send[i].toString());
    });
    server.close();
    client.close();
  }
});
server.on("listening", function () {
  console.log("server is listening");
  client = dgram.createSocket("unix_dgram");
  messages_to_send.forEach(function (m) {
    client.send(m, 0, m.length, server_path, function (err, bytes) {
      if (err) {
        console.log("Caught error in client send.");
        throw err;
      }
      console.log("client wrote " + bytes + " bytes.");
    });
  });
  client.on("close", function () {
    if (server.fd === null) {
      clearTimeout(timer);
    }
  });
});
server.on("close", function () {
  if (client.fd === null) {
    clearTimeout(timer);
  }
});

timer = setTimeout(function () {
    throw new Error("Timeout");
}, 200);