Implement MojoGetBufferInformation(), part 1.

mojo/edk/system/dispatcher.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 "mojo/edk/system/dispatcher.h"
 
 #include "base/logging.h"
 #include "mojo/edk/system/configuration.h"
 #include "mojo/edk/system/data_pipe_consumer_dispatcher.h"
 #include "mojo/edk/system/data_pipe_producer_dispatcher.h"
@@ skipping 188 matching lines @@
 MojoResult Dispatcher::DuplicateBufferHandle(
     UserPointer<const MojoDuplicateBufferHandleOptions> options,
     RefPtr<Dispatcher>* new_dispatcher) {
   MutexLocker locker(&mutex_);
   if (is_closed_)
     return MOJO_RESULT_INVALID_ARGUMENT;
 
   return DuplicateBufferHandleImplNoLock(options, new_dispatcher);
 }
 
+MojoResult Dispatcher::GetBufferInformation(
+    UserPointer<MojoBufferInformation> info,
+    uint32_t info_num_bytes) {
+  MutexLocker locker(&mutex_);
+  if (is_closed_)
+    return MOJO_RESULT_INVALID_ARGUMENT;
+
+  return GetBufferInformationImplNoLock(info, info_num_bytes);
+}
+
 MojoResult Dispatcher::MapBuffer(
     uint64_t offset,
     uint64_t num_bytes,
     MojoMapBufferFlags flags,
     std::unique_ptr<PlatformSharedBufferMapping>* mapping) {
   MutexLocker locker(&mutex_);
   if (is_closed_)
     return MOJO_RESULT_INVALID_ARGUMENT;
 
   return MapBufferImplNoLock(offset, num_bytes, flags, mapping);
@@ skipping 132 matching lines @@
 
 MojoResult Dispatcher::DuplicateBufferHandleImplNoLock(
     UserPointer<const MojoDuplicateBufferHandleOptions> /*options*/,
     RefPtr<Dispatcher>* /*new_dispatcher*/) {
   mutex_.AssertHeld();
   DCHECK(!is_closed_);
   // By default, not supported. Only needed for buffer dispatchers.
   return MOJO_RESULT_INVALID_ARGUMENT;
 }
 
+MojoResult Dispatcher::GetBufferInformationImplNoLock(
+    UserPointer<MojoBufferInformation> /*info*/,
+    uint32_t /*info_num_bytes*/) {
+  mutex_.AssertHeld();
+  DCHECK(!is_closed_);
+  // By default, not supported. Only needed for buffer dispatchers.
+  return MOJO_RESULT_INVALID_ARGUMENT;
+}
+
 MojoResult Dispatcher::MapBufferImplNoLock(
     uint64_t /*offset*/,
     uint64_t /*num_bytes*/,
     MojoMapBufferFlags /*flags*/,
     std::unique_ptr<PlatformSharedBufferMapping>* /*mapping*/) {
   mutex_.AssertHeld();
   DCHECK(!is_closed_);
   // By default, not supported. Only needed for buffer dispatchers.
   return MOJO_RESULT_INVALID_ARGUMENT;
 }
@@ skipping 117 matching lines @@
 // DispatcherTransport ---------------------------------------------------------
 
 void DispatcherTransport::End() {
   DCHECK(dispatcher_);
   dispatcher_->mutex_.Unlock();
   dispatcher_ = nullptr;
 }
 
 }  // namespace system
 }  // namespace mojo