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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_MEMORY_PLATFORM_SHARED_MEMORY_HANDLE_H_
#define BASE_MEMORY_PLATFORM_SHARED_MEMORY_HANDLE_H_
#include "build/build_config.h"
#if BUILDFLAG(IS_APPLE)
#include <mach/mach.h>
#include "base/apple/scoped_mach_port.h"
#elif BUILDFLAG(IS_FUCHSIA)
#include <lib/zx/vmo.h>
#elif BUILDFLAG(IS_WIN)
#include "base/win/scoped_handle.h"
#include "base/win/windows_types.h"
#elif BUILDFLAG(IS_POSIX)
#include <sys/types.h>
#include "base/files/scoped_file.h"
#endif
namespace base::subtle {
#if BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_APPLE) && !BUILDFLAG(IS_ANDROID)
// Helper structs to keep two descriptors on POSIX. It's needed to support
// ConvertToReadOnly().
struct BASE_EXPORT FDPair {
// The main shared memory descriptor that is used for mapping. May be either
// writable or read-only, depending on region's mode.
int fd;
// The read-only descriptor, valid only in kWritable mode. Replaces |fd| when
// a region is converted to read-only.
int readonly_fd;
};
struct BASE_EXPORT ScopedFDPair {
ScopedFDPair();
ScopedFDPair(ScopedFD in_fd, ScopedFD in_readonly_fd);
ScopedFDPair(ScopedFDPair&&);
ScopedFDPair& operator=(ScopedFDPair&&);
~ScopedFDPair();
FDPair get() const;
ScopedFD fd;
ScopedFD readonly_fd;
};
#endif
// Platform-specific shared memory type used by the shared memory system.
#if BUILDFLAG(IS_APPLE)
using PlatformSharedMemoryHandle = mach_port_t;
using ScopedPlatformSharedMemoryHandle = apple::ScopedMachSendRight;
#elif BUILDFLAG(IS_FUCHSIA)
using PlatformSharedMemoryHandle = zx::unowned_vmo;
using ScopedPlatformSharedMemoryHandle = zx::vmo;
#elif BUILDFLAG(IS_WIN)
using PlatformSharedMemoryHandle = HANDLE;
using ScopedPlatformSharedMemoryHandle = win::ScopedHandle;
#elif BUILDFLAG(IS_ANDROID)
using PlatformSharedMemoryHandle = int;
using ScopedPlatformSharedMemoryHandle = ScopedFD;
#else
using PlatformSharedMemoryHandle = FDPair;
using ScopedPlatformSharedMemoryHandle = ScopedFDPair;
#endif
} // namespace base::subtle
#endif // BASE_MEMORY_PLATFORM_SHARED_MEMORY_HANDLE_H_
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