Implement MojoGetBufferInformation(), part 1.

mojo/edk/system/dispatcher.h

 // 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.
 
 #ifndef MOJO_EDK_SYSTEM_DISPATCHER_H_
 #define MOJO_EDK_SYSTEM_DISPATCHER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 98 matching lines @@
   MojoResult BeginReadData(UserPointer<const void*> buffer,
                            UserPointer<uint32_t> buffer_num_bytes,
                            MojoReadDataFlags flags);
   MojoResult EndReadData(uint32_t num_bytes_read);
   // |options| may be null. |new_dispatcher| must not be null, but
   // |*new_dispatcher| should be null (and will contain the dispatcher for the
   // new handle on success).
   MojoResult DuplicateBufferHandle(
       UserPointer<const MojoDuplicateBufferHandleOptions> options,
       util::RefPtr<Dispatcher>* new_dispatcher);
+  MojoResult GetBufferInformation(UserPointer<MojoBufferInformation> info,
+                                  uint32_t info_num_bytes);
   MojoResult MapBuffer(
       uint64_t offset,
       uint64_t num_bytes,
       MojoMapBufferFlags flags,
       std::unique_ptr<platform::PlatformSharedBufferMapping>* mapping);
 
   // Gets the current handle signals state. (The default implementation simply
   // returns a default-constructed |HandleSignalsState|, i.e., no signals
   // satisfied or satisfiable.) Note: The state is subject to change from other
   // threads.
@@ skipping 129 matching lines @@
   virtual MojoResult BeginReadDataImplNoLock(
       UserPointer<const void*> buffer,
       UserPointer<uint32_t> buffer_num_bytes,
       MojoReadDataFlags flags) MOJO_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
   virtual MojoResult EndReadDataImplNoLock(uint32_t num_bytes_read)
       MOJO_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
   virtual MojoResult DuplicateBufferHandleImplNoLock(
       UserPointer<const MojoDuplicateBufferHandleOptions> options,
       util::RefPtr<Dispatcher>* new_dispatcher)
       MOJO_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
+  virtual MojoResult GetBufferInformationImplNoLock(
+      UserPointer<MojoBufferInformation> info,
+      uint32_t info_num_bytes) MOJO_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
   virtual MojoResult MapBufferImplNoLock(
       uint64_t offset,
       uint64_t num_bytes,
       MojoMapBufferFlags flags,
       std::unique_ptr<platform::PlatformSharedBufferMapping>* mapping)
       MOJO_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
   virtual HandleSignalsState GetHandleSignalsStateImplNoLock() const
       MOJO_SHARED_LOCKS_REQUIRED(mutex_);
   virtual MojoResult AddAwakableImplNoLock(Awakable* awakable,
                                            MojoHandleSignals signals,
@@ skipping 145 matching lines @@
 
 // So logging macros and |DCHECK_EQ()|, etc. work.
 inline std::ostream& operator<<(std::ostream& out, Dispatcher::Type type) {
   return out << static_cast<int>(type);
 }
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_DISPATCHER_H_