# File lib/net/sftp/protocol/05/impl.rb, line 61
    def open( id, path, flags, mode=0660 )
      sftp_flags, desired_access = case
        when flags & IO::WRONLY != 0 then
          [ F_CREATE_TRUNCATE,
            ACE::F_WRITE_DATA | ACE::F_WRITE_ATTRIBUTES ]
        when flags & IO::RDWR   != 0 then
          [ F_OPEN_OR_CREATE,
            ACE::F_READ_DATA | ACE::F_READ_ATTRIBUTES |
            ACE::F_WRITE_DATA | ACE::F_WRITE_ATTRIBUTES ]
        when flags & IO::APPEND != 0 then
          [ F_OPEN_OR_CREATE | F_APPEND_DATA,
            ACE::F_WRITE_DATA | ACE::F_WRITE_ATTRIBUTES |
            ACE::F_APPEND_DATA ]
        else
          [ F_OPEN_EXISTING,
            ACE::F_READ_DATA | ACE::F_READ_ATTRIBUTES ]
      end

      sftp_flags |= F_OPEN_OR_CREATE if flags & IO::CREAT != 0
      sftp_flags |= F_TRUNCATE_EXISTING if flags & IO::TRUNC != 0

      attributes = @attr_factory.empty
      attributes.permissions = mode

      open_raw id, path, desired_access, sftp_flags, attributes
    end