[NaCl SDK] Add some more logging to nacl_io.

native_client_sdk/src/libraries/nacl_io/socket/tcp_node.cc

 // Copyright 2013 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/ossocket.h"
 #ifdef PROVIDES_SOCKET_API
 
 #include <assert.h>
 #include <errno.h>
 #include <string.h>
 #include <algorithm>
 
 #include "nacl_io/kernel_handle.h"
+#include "nacl_io/log.h"
 #include "nacl_io/pepper_interface.h"
 #include "nacl_io/socket/tcp_node.h"
 #include "nacl_io/stream/stream_fs.h"
 
 namespace {
 const size_t kMaxPacketSize = 65536;
 const size_t kDefaultFifoSize = kMaxPacketSize * 8;
 }
 
 namespace nacl_io {
@@ skipping 256 matching lines @@
 void TcpNode::Destroy() {
   emitter_->DetachStream();
   SocketNode::Destroy();
 }
 
 Error TcpNode::Init(int open_flags) {
   Error err = SocketNode::Init(open_flags);
   if (err != 0)
     return err;
 
-  if (TCPInterface() == NULL)
+  if (TCPInterface() == NULL) {
+    LOG_ERROR("Got NULL interface: TCP");
     return EACCES;
+  }
 
   if (socket_resource_ != 0) {
     // TCP sockets that are contructed with an existing socket_resource_
     // are those that generated from calls to Accept() and therefore are
     // already connected.
     remote_addr_ = TCPInterface()->GetRemoteAddress(socket_resource_);
     ConnectDone_Locked();
   } else {
     socket_resource_ =
         TCPInterface()->Create(filesystem_->ppapi()->GetInstance());
-    if (0 == socket_resource_)
+    if (0 == socket_resource_) {
+      LOG_ERROR("Unable to create TCP resource.");
       return EACCES;
+    }
     SetStreamFlags(SSF_CAN_CONNECT);
   }
 
   return 0;
 }
 
 EventEmitter* TcpNode::GetEventEmitter() {
   return emitter_.get();
 }
 
@@ skipping 162 matching lines @@
   }
 
   ConnectDone_Locked();
   return 0;
 }
 
 Error TcpNode::Shutdown(int how) {
   AUTO_LOCK(node_lock_);
   if (!IsConnected())
     return ENOTCONN;
+
   {
     AUTO_LOCK(emitter_->GetLock());
     emitter_->SetError_Locked();
   }
   return 0;
 }
 
 void TcpNode::ConnectDone_Locked() {
   local_addr_ = TCPInterface()->GetLocalAddress(socket_resource_);
 
@@ skipping 54 matching lines @@
   assert(emitter_.get());
   if (emitter_->GetError_Locked())
     return EPIPE;
   *out_len = emitter_->WriteOut_Locked((char*)buf, len);
   return 0;
 }
 
 }  // namespace nacl_io
 
 #endif  // PROVIDES_SOCKET_API