Remove send fd functionality

It was broken anyway. It will go into its own class later.

lib/net.js

@@ -23,8 +23,6 @@ var accept      = binding.accept;
 var close       = binding.close;
 var shutdown    = binding.shutdown;
 var read        = binding.read;
-var recvMsg     = binding.recvMsg;
-var sendFD      = binding.sendFD;
 var write       = binding.write;
 var toRead      = binding.toRead;
 var setNoDelay  = binding.setNoDelay;
@@ -248,13 +246,11 @@ function _doFlush () {
   var socket = this.socket;
   // Stream becomes writeable on connect() but don't flush if there's
   // nothing actually to write
-  if ((socket._writeQueueSize == 0) && (socket._writeMessageQueueSize == 0)) {
+  if (socket._writeQueueSize == 0) {
       return;
   }
   if (socket.flush()) {
     assert(socket._writeQueueSize == 0);
-    assert(socket._writeMessageQueueSize == 0);
-
     if (socket._events && socket._events['drain']) socket.emit("drain");
     if (socket.ondrain) socket.ondrain(); // Optimization
   }
@@ -280,21 +276,10 @@ function initStream (self) {
     var bytesRead;
 
     try {
-      if (self.type == "unix") {
-        bytesRead = recvMsg(self.fd,
-                            recvBuffer,
-                            recvBuffer.used,
-                            recvBuffer.length - recvBuffer.used);
-        //debug('recvMsg.fd ' + recvMsg.fd);
-        if (recvMsg.fd) {
-          self.emit('fd', recvMsg.fd);
-        }
-      } else {
       bytesRead = read(self.fd,
                        recvBuffer,
                        recvBuffer.used,
                        recvBuffer.length - recvBuffer.used);
-      }
     } catch (e) {
       self.forceClose(e);
       return;
@@ -302,7 +287,7 @@ function initStream (self) {
 
     //debug('bytesRead ' + bytesRead + '\n');
 
-    if (!recvMsg.fd && bytesRead == 0) {
+    if (bytesRead == 0) {
       self.readable = false;
       self._readWatcher.stop();
 
@@ -351,7 +336,6 @@ function initStream (self) {
   self._writeQueue = [];    // queue of buffers that need to be written to socket
                           // XXX use link list?
   self._writeQueueSize = 0; // in bytes, not to be confused with _writeQueue.length!
-  self._writeMessageQueueSize = 0; // number of messages remaining to be sent
 
   self._writeWatcher = ioWatchers.alloc();
   self._writeWatcher.socket = self;
@@ -442,30 +426,17 @@ Stream.prototype._writeString = function (data, encoding) {
   var charsWritten;
   var bytesWritten;
 
-  // The special encoding "fd" means that data is an integer FD and we want
-  // to pass the FD on the socket with sendmsg()
-  if (encoding == "fd") {
-    buffer.isFd = true;
-    // TODO is this OK -- does it guarantee that the fd is the only thing in the buffer?
-    charsWritten = buffer.asciiWrite(data, buffer.used, buffer.length - buffer.used);
-    bytesWritten = charsWritten;
-  } else if (encoding.toLowerCase() == 'utf8') {
-    buffer.isFd = false;
+  if (encoding.toLowerCase() == 'utf8') {
     charsWritten = buffer.utf8Write(data, buffer.used);
     bytesWritten = Buffer.utf8ByteLength(data.slice(0, charsWritten));
   } else {
     // ascii
-    buffer.isFd = false;
     charsWritten = buffer.asciiWrite(data, buffer.used);
     bytesWritten = charsWritten;
   }
 
   buffer.used += bytesWritten;
-  if (buffer.isFd) {
-    self._writeMessageQueueSize += 1;
-  } else {
   self._writeQueueSize += bytesWritten;
-  }
 
   //debug('charsWritten ' + charsWritten);
   //debug('buffer.used ' + buffer.used);
@@ -596,28 +567,6 @@ Stream.prototype._writeQueued = function (data, encoding) {
   return this.flush();
 };
 
-// Sends a file descriptor over a unix socket
-Stream.prototype.sendFD = function(socketToPass) {
-  var self = this;
-
-  if (!self.writable) throw new Error('Stream is not writable');
-
-  if (self.__writeQueueLast() == END_OF_FILE) {
-    throw new Error('socket.close() called already; cannot write.');
-  }
-
-  if (self.type != "unix") {
-    throw new Error('FD passing only available on unix sockets');
-  }
-
-  if (! socketToPass instanceof Stream) {
-    throw new Error('Provided arg is not a socket');
-  }
-
-  return self.write(socketToPass.fd.toString(), "fd");
-};
-
-
 // Flushes the write buffer out.
 // Returns true if the entire buffer was flushed.
 Stream.prototype.flush = function () {
@@ -644,15 +593,10 @@ Stream.prototype.flush = function () {
     var fdToSend = null;
 
     try {
-      if (b.isFd) {
-        fdToSend = parseInt(b.asciiSlice(b.sent, b.used - b.sent));
-        bytesWritten = writeFD(self.fd, fdToSend);
-      } else {
       bytesWritten = write(self.fd,
                            b,
                            b.sent,
                            b.used - b.sent);
-      }
     } catch (e) {
       self.forceClose(e);
       return false;
@@ -667,10 +611,6 @@ Stream.prototype.flush = function () {
       self._writeWatcher.start();
       assert(self._writeQueueSize > 0);
       return false;
-    } else if (b.isFd) {
-      b.sent = b.used;
-      self._writeMessageQueueSize -= 1;
-      //debug('sent fd: ' + fdToSend);
     } else {
       b.sent += bytesWritten;
       self._writeQueueSize -= bytesWritten;