[NaCl SDK] Add UDP and TCP Sockets

native_client_sdk/src/libraries/nacl_io/kernel_handle.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "nacl_io/kernel_handle.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <pthread.h>
 
@@ skipping 11 matching lines @@
 
 KernelHandle::KernelHandle(const ScopedMount& mnt, const ScopedMountNode& node)
     : mount_(mnt), node_(node), offs_(0) {}
 
 KernelHandle::~KernelHandle() {
   // Force release order for cases where mount_ is not ref'd by mounting.
   node_.reset(NULL);
   mount_.reset(NULL);
 }
 
+// Returns the MountNodeSocket* if this node is a socket.
+MountNodeSocket*  KernelHandle::socket_node() {
+  if (node_.get() && node_->IsaSock())
+    return reinterpret_cast<MountNodeSocket*>(node_.get());
+  return NULL;
+}
+
 Error KernelHandle::Init(int open_mode) {
   if (open_mode & O_APPEND) {
     Error error = node_->GetSize(&offs_);
     if (error)
       return error;
   }
 
   return 0;
 }
 
@@ skipping 57 matching lines @@
 
 Error KernelHandle::GetDents(struct dirent* pdir, size_t nbytes, int* cnt) {
   AUTO_LOCK(offs_lock_);
   Error error = node_->GetDents(offs_, pdir, nbytes, cnt);
   if (0 == error)
     offs_ += *cnt;
   return error;
 }
 
 }  // namespace nacl_io