| // Copyright 2017 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/file_descriptor_store.h" |
| |
| #include <utility> |
| |
| #include "base/logging.h" |
| |
| namespace base { |
| |
| FileDescriptorStore::Descriptor::Descriptor(const std::string& key, |
| base::ScopedFD fd) |
| : key(key), |
| fd(std::move(fd)), |
| region(base::MemoryMappedFile::Region::kWholeFile) {} |
| |
| FileDescriptorStore::Descriptor::Descriptor( |
| const std::string& key, |
| base::ScopedFD fd, |
| base::MemoryMappedFile::Region region) |
| : key(key), fd(std::move(fd)), region(region) {} |
| |
| FileDescriptorStore::Descriptor::Descriptor( |
| FileDescriptorStore::Descriptor&& other) |
| : key(other.key), fd(std::move(other.fd)), region(other.region) {} |
| |
| FileDescriptorStore::Descriptor::~Descriptor() = default; |
| |
| // static |
| FileDescriptorStore& FileDescriptorStore::GetInstance() { |
| static FileDescriptorStore* store = new FileDescriptorStore; |
| return *store; |
| } |
| |
| base::ScopedFD FileDescriptorStore::TakeFD( |
| const std::string& key, |
| base::MemoryMappedFile::Region* region) { |
| base::ScopedFD fd = MaybeTakeFD(key, region); |
| if (!fd.is_valid()) |
| DLOG(DCHECK) << "Unknown global descriptor: " << key; |
| return fd; |
| } |
| |
| base::ScopedFD FileDescriptorStore::MaybeTakeFD( |
| const std::string& key, |
| base::MemoryMappedFile::Region* region) { |
| auto iter = descriptors_.find(key); |
| if (iter == descriptors_.end()) |
| return base::ScopedFD(); |
| *region = iter->second.region; |
| base::ScopedFD result = std::move(iter->second.fd); |
| descriptors_.erase(iter); |
| return result; |
| } |
| |
| void FileDescriptorStore::Set(const std::string& key, base::ScopedFD fd) { |
| Set(key, std::move(fd), base::MemoryMappedFile::Region::kWholeFile); |
| } |
| |
| void FileDescriptorStore::Set(const std::string& key, |
| base::ScopedFD fd, |
| base::MemoryMappedFile::Region region) { |
| Descriptor descriptor(key, std::move(fd), region); |
| descriptors_.insert(std::make_pair(key, std::move(descriptor))); |
| } |
| |
| FileDescriptorStore::FileDescriptorStore() = default; |
| |
| FileDescriptorStore::~FileDescriptorStore() = default; |
| |
| } // namespace base |