sandboxed-api/sandboxed_api/embed_file.h

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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SANDBOXED_API_EMBED_FILE_H_
#define SANDBOXED_API_EMBED_FILE_H_
#include "sandboxed_api/file_toc.h"
#include "absl/base/thread_annotations.h"
#include "absl/container/flat_hash_map.h"
#include "absl/synchronization/mutex.h"
namespace sapi {
// The class provides primitives for converting FileToc structures into
// executable files.
class EmbedFile {
public:
EmbedFile(const EmbedFile&) = delete;
EmbedFile& operator=(const EmbedFile&) = delete;
// Returns the pointer to the per-process EmbedFile object.
static EmbedFile* instance();
// Returns a file-descriptor for a given FileToc.
int GetFdForFileToc(const FileToc* toc);
// Returns a duplicated file-descriptor for a given FileToc.
int GetDupFdForFileToc(const FileToc* toc);
private:
// Creates an executable file for a given FileToc, and return its
// file-descriptors (-1 in case of errors).
static int CreateFdForFileToc(const FileToc* toc);
EmbedFile() = default;
// List of File TOCs and corresponding file-descriptors.
absl::flat_hash_map<const FileToc*, int> file_tocs_
ABSL_GUARDED_BY(file_tocs_mutex_);
absl::Mutex file_tocs_mutex_;
};
} // namespace sapi
#endif // SANDBOXED_API_EMBED_FILE_H_