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          Boost.Asio supports programs that utilise the fork() system
          call. Provided the program calls io_context.notify_fork()
          at the appropriate times, Boost.Asio will recreate any internal file descriptors
          (such as the "self-pipe trick" descriptor used for waking up
          a reactor). The notification is usually performed as follows:
        
io_context_.notify_fork(boost::asio::io_context::fork_prepare);
if (fork() == 0)
{
  io_context_.notify_fork(boost::asio::io_context::fork_child);
  ...
}
else
{
  io_context_.notify_fork(boost::asio::io_context::fork_parent);
  ...
}
          User-defined services can also be made fork-aware by overriding the io_context::service::notify_fork()
          virtual function.
        
          Note that any file descriptors accessible via Boost.Asio's public API (e.g.
          the descriptors underlying basic_socket<>, posix::stream_descriptor,
          etc.) are not altered during a fork. It is the program's responsibility
          to manage these as required.
        
io_context::notify_fork(), io_context::fork_event, io_context::service::notify_fork(), Fork examples.