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// 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(FATAL) << "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
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