namespace hamigaki {
  namespace process {
    class child;
    void launch_detached(const std::string&, const std::vector<std::string>&, 
                         const environment&);
    void launch_detached(const std::string&, const std::vector<std::string>&);
    void launch_detached(const std::string&, const environment&);
    void launch_detached(const std::string&);
  }
}

namespace hamigaki {
  namespace process {
    class context;
  }
}

namespace hamigaki {
  namespace process {
    class environment;
  }
}

namespace hamigaki {
  namespace process {
    typedef implementation defined handle_type;

    class pipe_source;
    class pipe_sink;
  }
}

namespace hamigaki {
  namespace process {
    child launch_shell(const std::string&, const context&);
    child launch_shell(const std::string&);
    std::string shell_expand(const std::string&);
  }
}

namespace hamigaki {
  namespace process {
    class status;
  }
}

namespace hamigaki {
  namespace process {
    class stream_behavior;
    stream_behavior capture_stream();
    stream_behavior close_stream();
    stream_behavior inherit_stream();
    stream_behavior redirect_stream_to_stdout();
    stream_behavior silence_stream();
  }
}