// Copyright 2018 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. #include "base/memory/unsafe_shared_memory_region.h" #include #include "base/check_op.h" namespace base { UnsafeSharedMemoryRegion::CreateFunction* UnsafeSharedMemoryRegion::create_hook_ = nullptr; // static UnsafeSharedMemoryRegion UnsafeSharedMemoryRegion::Create(size_t size) { if (create_hook_) return create_hook_(size); subtle::PlatformSharedMemoryRegion handle = subtle::PlatformSharedMemoryRegion::CreateUnsafe(size); return UnsafeSharedMemoryRegion(std::move(handle)); } // static UnsafeSharedMemoryRegion UnsafeSharedMemoryRegion::Deserialize( subtle::PlatformSharedMemoryRegion handle) { return UnsafeSharedMemoryRegion(std::move(handle)); } // static subtle::PlatformSharedMemoryRegion UnsafeSharedMemoryRegion::TakeHandleForSerialization( UnsafeSharedMemoryRegion region) { return std::move(region.handle_); } UnsafeSharedMemoryRegion::UnsafeSharedMemoryRegion() = default; UnsafeSharedMemoryRegion::UnsafeSharedMemoryRegion( UnsafeSharedMemoryRegion&& region) = default; UnsafeSharedMemoryRegion& UnsafeSharedMemoryRegion::operator=( UnsafeSharedMemoryRegion&& region) = default; UnsafeSharedMemoryRegion::~UnsafeSharedMemoryRegion() = default; UnsafeSharedMemoryRegion UnsafeSharedMemoryRegion::Duplicate() const { return UnsafeSharedMemoryRegion(handle_.Duplicate()); } WritableSharedMemoryMapping UnsafeSharedMemoryRegion::Map( SharedMemoryMapper* mapper) const { return MapAt(0, handle_.GetSize(), mapper); } WritableSharedMemoryMapping UnsafeSharedMemoryRegion::MapAt( uint64_t offset, size_t size, SharedMemoryMapper* mapper) const { if (!IsValid()) return {}; auto result = handle_.MapAt(offset, size, mapper); if (!result.has_value()) return {}; return WritableSharedMemoryMapping(result.value(), size, handle_.GetGUID(), mapper); } bool UnsafeSharedMemoryRegion::IsValid() const { return handle_.IsValid(); } UnsafeSharedMemoryRegion::UnsafeSharedMemoryRegion( subtle::PlatformSharedMemoryRegion handle) : handle_(std::move(handle)) { if (handle_.IsValid()) { CHECK_EQ(handle_.GetMode(), subtle::PlatformSharedMemoryRegion::Mode::kUnsafe); } } } // namespace base