typedef enum { ... } SilcClientFileError;

    File transmission error types.  These types are returned by
    some of the file transmission functions, and by the monitor
    callback to indicate error.

    typedef enum {
      SILC_CLIENT_FILE_OK,
      SILC_CLIENT_FILE_ERROR,
      SILC_CLIENT_FILE_UNKNOWN_SESSION,
      SILC_CLIENT_FILE_ALREADY_STARTED,
      SILC_CLIENT_FILE_NO_SUCH_FILE,
      SILC_CLIENT_FILE_PERMISSION_DENIED,
      SILC_CLIENT_FILE_KEY_AGREEMENT_FAILED,
    } SilcClientFileError;