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base/file_descriptor_store.h

+// Copyright 2017 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.
+
+#ifndef BASE_FILE_DESCRIPTOR_STORE_H_
+#define BASE_FILE_DESCRIPTOR_STORE_H_
+
+#include <stdint.h>
+
+#include <vector>
+
+#include "base/files/memory_mapped_file.h"
+#include "base/memory/singleton.h"
+
+namespace base {
+
+// The file descriptor store is used to associate file descriptors with keys
+// that must be unique.
+// It is used to share file descriptors from a process to its child.
+class BASE_EXPORT FileDescriptorStore {
+ public:
+  struct Descriptor {
+    Descriptor(const std::string& key, int fd);
+    Descriptor(const std::string& key,
+               int fd,
+               base::MemoryMappedFile::Region region);
+
+    // Globally unique key.
+    std::string key;
+    // Actual FD.
+    int fd;
+    // Optional region, defaults to kWholeFile.
+    base::MemoryMappedFile::Region region;
+  };
+  typedef std::vector<Descriptor> Mapping;
+
+  // Returns the singleton instance of FileDescriptorStore.
+  static FileDescriptorStore* GetInstance();
+
+  // Gets a descriptor given a key. It is a fatal error if the key is not known.
+  int Get(const std::string& key) const;
+
+  // Gets a descriptor given a key. Returns -1 on error.
+  int MaybeGet(const std::string& key) const;
+
+  // Gets a region given a key. It is a fatal error if the key is not known.
+  base::MemoryMappedFile::Region GetRegion(const std::string& key) const;
+
+  // Sets the descriptor for the given |key|. This sets the region associated
+  // with |key| to kWholeFile.
+  void Set(const std::string& key, int fd);
+
+  // Sets the descriptor and |region| for the given |key|.
+  void Set(const std::string& key,
+           int fd,
+           base::MemoryMappedFile::Region region);
+
+  void Reset(const Mapping& mapping);
+
+ private:
+  friend struct DefaultSingletonTraits<FileDescriptorStore>;
+  FileDescriptorStore();
+  ~FileDescriptorStore();
+
+  Mapping descriptors_;
+};
+
+}  // namespace base
+
+#endif  // BASE_FILE_DESCRIPTOR_STORE_H_