The Tor Browser: ipc/glue/SharedMemoryBasic

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-

     2  * vim: sw=2 ts=8 et :

     3  */

     4 /* This Source Code Form is subject to the terms of the Mozilla Public

     5  * License, v. 2.0. If a copy of the MPL was not distributed with this

     6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     8 #ifndef mozilla_ipc_SharedMemoryBasic_android_h

     9 #define mozilla_ipc_SharedMemoryBasic_android_h

    11 #include "base/file_descriptor_posix.h"

    13 #include "SharedMemory.h"

    15 //

    16 // This is a low-level wrapper around platform shared memory.  Don't

    17 // use it directly; use Shmem allocated through IPDL interfaces.

    18 //

    20 namespace mozilla {

    21 namespace ipc {

    23 class SharedMemoryBasic : public SharedMemory

    24 {

    25 public:

    26   typedef base::FileDescriptor Handle;

    28   SharedMemoryBasic();

    30   SharedMemoryBasic(const Handle& aHandle);

    32   virtual ~SharedMemoryBasic();

    34   virtual bool Create(size_t aNbytes) MOZ_OVERRIDE;

    36   virtual bool Map(size_t nBytes) MOZ_OVERRIDE;

    38   virtual void* memory() const MOZ_OVERRIDE

    39   {

    40     return mMemory;

    41   }

    43   virtual SharedMemoryType Type() const MOZ_OVERRIDE

    44   {

    45     return TYPE_BASIC;

    46   }

    48   static Handle NULLHandle()

    49   {

    50     return Handle();

    51   }

    53   static bool IsHandleValid(const Handle &aHandle)

    54   {

    55     return aHandle.fd >= 0;

    56   }

    58   bool ShareToProcess(base::ProcessHandle aProcess,

    59                       Handle* aNewHandle);

    61 private:

    62   void Unmap();

    63   void Destroy();

    65   // The /dev/ashmem fd we allocate.

    66   int mShmFd;

    67   // Pointer to mapped region, null if unmapped.

    68   void *mMemory;

    69 };

    71 } // namespace ipc

    72 } // namespace mozilla

    74 #endif // ifndef mozilla_ipc_SharedMemoryBasic_android_h

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