shmem_buffer_impl.h

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// Copyright (c) Space-ng, inc. All rights reserved.
 
#pragma once
#include <unistd.h>
 
#include <cstddef>
#include <cstdint>
#include <random>
 
namespace sol3::core::impl {
 
class FileDescriptor {
 public:
  explicit FileDescriptor(int fd = -1);
  ~FileDescriptor();
 
  // Move constructor
  FileDescriptor(FileDescriptor&& other) noexcept;
 
  // Move assignment
  FileDescriptor& operator=(FileDescriptor&& other) noexcept;
 
  // Disable copy
  FileDescriptor(FileDescriptor const&) = delete;
  FileDescriptor& operator=(FileDescriptor const&) = delete;
 
  int get() const;
  void reset(int fd = -1);
 
 private:
  int fd_;
  void close();
};
 
class Mmap {
 public:
  Mmap() = default;
  Mmap(void* addr, size_t length, int prot, int flags, int fd, off_t offset);
  ~Mmap();
 
  void* data() const;
  size_t size() const;
  bool valid() const;
 
  // Non-copyable, movable
  Mmap(Mmap const&) = delete;
  Mmap& operator=(Mmap const&) = delete;
  Mmap(Mmap&& other) noexcept;
  Mmap& operator=(Mmap&& other) noexcept;
 
 private:
  void* ptr_ = nullptr;
  size_t len_ = 0;
};
 
inline uint64_t makeUuid() {
  std::random_device rd;
  std::mt19937_64 gen(rd());
  return gen();
}
 
}  // namespace sol3::core::impl