[NaCl SDK] Add some more logging to nacl_io.

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 <pthread.h>
 
 #include "nacl_io/filesystem.h"
@@ skipping 133 matching lines @@
         // Attempt to clear O_APPEND.
         return EPERM;
       }
       // Only certain flags are mutable
       const int mutable_flags = O_ASYNC | O_NONBLOCK;
       flags &= mutable_flags;
       handle_attr_.flags &= ~mutable_flags;
       handle_attr_.flags |= flags;
       return 0;
     }
+    default:
+      LOG_ERROR("Unsupported fcntl: %#x", request);
+      break;
   }
   return ENOSYS;
 }
 
 Error KernelHandle::Accept(PP_Resource* new_sock,
                            struct sockaddr* addr,
                            socklen_t* len) {
   SocketNode* sock = socket_node();
   if (!sock)
     return ENOTSOCK;
@@ skipping 61 matching lines @@
     return ENOTSOCK;
   if (OpenMode() == O_RDONLY)
     return EACCES;
 
   AUTO_LOCK(handle_lock_);
   return sock->SendTo(handle_attr_, buf, len, flags, dest_addr, addrlen,
                       out_len);
 }
 
 }  // namespace nacl_io