csrc/node-v0.10.24/test/simple/test-dgram-multicast-setTTL.js

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

var common = require('../common'),
    assert = require('assert'),
    dgram = require('dgram'),
    thrown = false,
    socket = dgram.createSocket('udp4');

socket.bind(common.PORT);
socket.on('listening', function () {
  socket.setMulticastTTL(16);

  //Try to set an invalid TTL (valid ttl is > 0 and < 256)
  try {
    socket.setMulticastTTL(1000);
  } catch (e) {
    thrown = true;
  }

  assert(thrown, 'Setting an invalid multicast TTL should throw some error');

  //close the socket
  socket.close();
});