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| 1 // Copyright 2017 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 #include "base/file_descriptor_store.h" |
| 6 |
| 7 #include <utility> |
| 8 |
| 9 #include "base/logging.h" |
| 10 |
| 11 namespace base { |
| 12 |
| 13 FileDescriptorStore::Descriptor::Descriptor(const std::string& key, |
| 14 base::ScopedFD fd) |
| 15 : key(key), |
| 16 fd(std::move(fd)), |
| 17 region(base::MemoryMappedFile::Region::kWholeFile) {} |
| 18 |
| 19 FileDescriptorStore::Descriptor::Descriptor( |
| 20 const std::string& key, |
| 21 base::ScopedFD fd, |
| 22 base::MemoryMappedFile::Region region) |
| 23 : key(key), fd(std::move(fd)), region(region) {} |
| 24 |
| 25 FileDescriptorStore::Descriptor::Descriptor( |
| 26 FileDescriptorStore::Descriptor&& other) |
| 27 : key(other.key), fd(std::move(other.fd)), region(other.region) {} |
| 28 |
| 29 FileDescriptorStore::Descriptor::~Descriptor() {} |
| 30 |
| 31 FileDescriptorStore::Descriptor& FileDescriptorStore::Descriptor::operator=( |
| 32 FileDescriptorStore::Descriptor&& other) { |
| 33 key = other.key; |
| 34 fd = std::move(other.fd); |
| 35 region = other.region; |
| 36 return *this; |
| 37 } |
| 38 |
| 39 // static |
| 40 FileDescriptorStore& FileDescriptorStore::GetInstance() { |
| 41 static FileDescriptorStore* store = new FileDescriptorStore; |
| 42 return *store; |
| 43 } |
| 44 |
| 45 base::ScopedFD FileDescriptorStore::TakeFD( |
| 46 const std::string& key, |
| 47 base::MemoryMappedFile::Region* region) { |
| 48 base::ScopedFD fd = MaybeTakeFD(key, region); |
| 49 if (!fd.is_valid()) |
| 50 DLOG(FATAL) << "Unknown global descriptor: " << key; |
| 51 return fd; |
| 52 } |
| 53 |
| 54 base::ScopedFD FileDescriptorStore::MaybeTakeFD( |
| 55 const std::string& key, |
| 56 base::MemoryMappedFile::Region* region) { |
| 57 auto iter = descriptors_.find(key); |
| 58 if (iter == descriptors_.end()) |
| 59 return base::ScopedFD(); |
| 60 descriptors_.erase(iter); |
| 61 if (region) |
| 62 *region = iter->second.region; |
| 63 return std::move(iter->second.fd); |
| 64 } |
| 65 |
| 66 void FileDescriptorStore::Set(const std::string& key, base::ScopedFD fd) { |
| 67 Set(key, std::move(fd), base::MemoryMappedFile::Region::kWholeFile); |
| 68 } |
| 69 |
| 70 void FileDescriptorStore::Set(const std::string& key, |
| 71 base::ScopedFD fd, |
| 72 base::MemoryMappedFile::Region region) { |
| 73 Descriptor descriptor(key, std::move(fd), region); |
| 74 descriptors_.insert(std::make_pair(key, std::move(descriptor))); |
| 75 } |
| 76 |
| 77 FileDescriptorStore::FileDescriptorStore() {} |
| 78 |
| 79 FileDescriptorStore::~FileDescriptorStore() {} |
| 80 |
| 81 } // namespace base |
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