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      1 // Copyright 2018 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "mojo/core/platform_handle_utils.h"
      6 
      7 #include "build/build_config.h"
      8 
      9 #if defined(OS_FUCHSIA)
     10 #include <lib/zx/vmo.h>
     11 #elif defined(OS_POSIX)
     12 #include "base/files/scoped_file.h"
     13 #elif defined(OS_WIN)
     14 #include "base/win/scoped_handle.h"
     15 #endif
     16 
     17 #if defined(OS_MACOSX) && !defined(OS_IOS)
     18 #include "base/mac/scoped_mach_port.h"
     19 #endif
     20 
     21 namespace mojo {
     22 namespace core {
     23 
     24 void ExtractPlatformHandlesFromSharedMemoryRegionHandle(
     25     base::subtle::PlatformSharedMemoryRegion::ScopedPlatformHandle handle,
     26     PlatformHandle* extracted_handle,
     27     PlatformHandle* extracted_readonly_handle) {
     28 #if defined(OS_WIN)
     29   *extracted_handle = PlatformHandle(base::win::ScopedHandle(handle.Take()));
     30 #elif defined(OS_FUCHSIA)
     31   *extracted_handle = PlatformHandle(std::move(handle));
     32 #elif defined(OS_MACOSX) && !defined(OS_IOS)
     33   // This is a Mach port. Same code as above and below, but separated for
     34   // clarity.
     35   *extracted_handle = PlatformHandle(std::move(handle));
     36 #elif defined(OS_ANDROID)
     37   // This is a file descriptor. Same code as above, but separated for clarity.
     38   *extracted_handle = PlatformHandle(std::move(handle));
     39 #else
     40   *extracted_handle = PlatformHandle(std::move(handle.fd));
     41   *extracted_readonly_handle = PlatformHandle(std::move(handle.readonly_fd));
     42 #endif
     43 }
     44 
     45 base::subtle::PlatformSharedMemoryRegion::ScopedPlatformHandle
     46 CreateSharedMemoryRegionHandleFromPlatformHandles(
     47     PlatformHandle handle,
     48     PlatformHandle readonly_handle) {
     49 #if defined(OS_WIN)
     50   DCHECK(!readonly_handle.is_valid());
     51   return handle.TakeHandle();
     52 #elif defined(OS_FUCHSIA)
     53   DCHECK(!readonly_handle.is_valid());
     54   return zx::vmo(handle.TakeHandle());
     55 #elif defined(OS_MACOSX) && !defined(OS_IOS)
     56   DCHECK(!readonly_handle.is_valid());
     57   return handle.TakeMachPort();
     58 #elif defined(OS_ANDROID)
     59   DCHECK(!readonly_handle.is_valid());
     60   return handle.TakeFD();
     61 #else
     62   return base::subtle::ScopedFDPair(handle.TakeFD(), readonly_handle.TakeFD());
     63 #endif
     64 }
     65 
     66 }  // namespace core
     67 }  // namespace mojo
     68