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// 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 <utility>
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() const {
return MapAt(0, handle_.GetSize());
}
WritableSharedMemoryMapping UnsafeSharedMemoryRegion::MapAt(off_t offset,
size_t size) const {
if (!IsValid())
return {};
void* memory = nullptr;
size_t mapped_size = 0;
if (!handle_.MapAt(offset, size, &memory, &mapped_size))
return {};
return WritableSharedMemoryMapping(memory, size, mapped_size,
handle_.GetGUID());
}
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
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