1 // Copyright 2016 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 // This file provides a C++ wrapping around the Mojo C API for platform handles, 6 // replacing the prefix of "Mojo" with a "mojo" namespace. 7 // 8 // Please see "mojo/public/c/system/platform_handle.h" for complete 9 // documentation of the API. 10 11 #ifndef MOJO_PUBLIC_CPP_SYSTEM_PLATFORM_HANDLE_H_ 12 #define MOJO_PUBLIC_CPP_SYSTEM_PLATFORM_HANDLE_H_ 13 14 #include <stdint.h> 15 16 #include "base/compiler_specific.h" 17 #include "base/files/file.h" 18 #include "base/logging.h" 19 #include "base/macros.h" 20 #include "base/memory/shared_memory_handle.h" 21 #include "base/process/process_handle.h" 22 #include "mojo/public/c/system/platform_handle.h" 23 #include "mojo/public/cpp/system/buffer.h" 24 #include "mojo/public/cpp/system/handle.h" 25 #include "mojo/public/cpp/system/system_export.h" 26 27 #if defined(OS_WIN) 28 #include <windows.h> 29 #endif 30 31 namespace mojo { 32 33 #if defined(OS_POSIX) 34 const MojoPlatformHandleType kPlatformFileHandleType = 35 MOJO_PLATFORM_HANDLE_TYPE_FILE_DESCRIPTOR; 36 37 #if defined(OS_MACOSX) && !defined(OS_IOS) 38 const MojoPlatformHandleType kPlatformSharedBufferHandleType = 39 MOJO_PLATFORM_HANDLE_TYPE_MACH_PORT; 40 #else 41 const MojoPlatformHandleType kPlatformSharedBufferHandleType = 42 MOJO_PLATFORM_HANDLE_TYPE_FILE_DESCRIPTOR; 43 #endif // defined(OS_MACOSX) && !defined(OS_IOS) 44 45 #elif defined(OS_WIN) 46 const MojoPlatformHandleType kPlatformFileHandleType = 47 MOJO_PLATFORM_HANDLE_TYPE_WINDOWS_HANDLE; 48 49 const MojoPlatformHandleType kPlatformSharedBufferHandleType = 50 MOJO_PLATFORM_HANDLE_TYPE_WINDOWS_HANDLE; 51 #endif // defined(OS_POSIX) 52 53 // Wraps a PlatformFile as a Mojo handle. Takes ownership of the file object. 54 MOJO_CPP_SYSTEM_EXPORT 55 ScopedHandle WrapPlatformFile(base::PlatformFile platform_file); 56 57 // Unwraps a PlatformFile from a Mojo handle. 58 MOJO_CPP_SYSTEM_EXPORT 59 MojoResult UnwrapPlatformFile(ScopedHandle handle, base::PlatformFile* file); 60 61 // Wraps a base::SharedMemoryHandle as a Mojo handle. Takes ownership of the 62 // SharedMemoryHandle. Note that |read_only| is only an indicator of whether 63 // |memory_handle| only supports read-only mapping. It does NOT have any 64 // influence on the access control of the shared buffer object. 65 MOJO_CPP_SYSTEM_EXPORT 66 ScopedSharedBufferHandle WrapSharedMemoryHandle( 67 const base::SharedMemoryHandle& memory_handle, 68 size_t size, 69 bool read_only); 70 71 // Unwraps a base::SharedMemoryHandle from a Mojo handle. The caller assumes 72 // responsibility for the lifetime of the SharedMemoryHandle. 73 MOJO_CPP_SYSTEM_EXPORT MojoResult 74 UnwrapSharedMemoryHandle(ScopedSharedBufferHandle handle, 75 base::SharedMemoryHandle* memory_handle, 76 size_t* size, 77 bool* read_only); 78 79 #if defined(OS_MACOSX) && !defined(OS_IOS) 80 // Wraps a mach_port_t as a Mojo handle. This takes a reference to the 81 // Mach port. 82 MOJO_CPP_SYSTEM_EXPORT ScopedHandle WrapMachPort(mach_port_t port); 83 84 // Unwraps a mach_port_t from a Mojo handle. The caller gets ownership of the 85 // Mach port. 86 MOJO_CPP_SYSTEM_EXPORT MojoResult UnwrapMachPort(ScopedHandle handle, 87 mach_port_t* port); 88 #endif // defined(OS_MACOSX) && !defined(OS_IOS) 89 90 } // namespace mojo 91 92 #endif // MOJO_PUBLIC_CPP_SYSTEM_PLATFORM_HANDLE_H_ 93
