dgram: support dgram.send with multiple buffers

Added ability to dgram.send to send multiple buffers, _writev style.
The offset and length parameters in dgram.send are now optional.
Refactored the dgram benchmarks, and seperated them from net.
Added docs for the new signature.

Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
Fixes: https://github.com/nodejs/node/issues/4302
PR-URL: https://github.com/nodejs/node/pull/4374

1 files changed, 21 insertions, 0 deletions

diff --git a/test/parallel/test-dgram-send-callback-buffer.js b/test/parallel/test-dgram-send-callback-buffer.js
new file mode 100644
index 0000000000..1aea2f77ef
--- /dev/null
+++ b/test/parallel/test-dgram-send-callback-buffer.js
@@ -0,0 +1,21 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const dgram = require('dgram');
+
+const client = dgram.createSocket('udp4');
+
+const buf = new Buffer(256);
+
+const onMessage = common.mustCall(function(err, bytes) {
+  assert.equal(bytes, buf.length);
+  clearTimeout(timer);
+  client.close();
+});
+
+const timer = setTimeout(function() {
+  throw new Error('Timeout');
+}, common.platformTimeout(200));
+
+client.send(buf, common.PORT, common.localhostIPv4, onMessage);