[NaCl SDK] Add UDP and TCP Sockets

native_client_sdk/src/libraries/nacl_io/kernel_handle.cc

Index: native_client_sdk/src/libraries/nacl_io/kernel_handle.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/kernel_handle.cc b/native_client_sdk/src/libraries/nacl_io/kernel_handle.cc
index d93c05b09991ffe54221d29051795f185d0d939b..37d3fa43b7ff40f1af119aaaa08ca37868550dd3 100644
--- a/native_client_sdk/src/libraries/nacl_io/kernel_handle.cc
+++ b/native_client_sdk/src/libraries/nacl_io/kernel_handle.cc
@@ -29,6 +29,13 @@ KernelHandle::~KernelHandle() {
   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_);