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* fhandler.h (fhandler_base::status): Declare private.
(fhandler_base::open_status): Ditto.
(class fhandler_socket): Move status bits into private bitfield struct
type status_flags. Change accessor methods appropriately.
* fhandler_socket.cc (fhandler_socket::fhandler_socket): Accomodate
above status bit changes.
* tty.h: Remove status bit enumerator.
(TTYISSETF): Remove.
(TTYSETF): Remove.
(TTYCLEARF): Remove.
(TTYCONDSETF): Remove.
(tty_min::status): Define as private bitfield struct type status_flags.
Add appropriate accessor methods.
* fhandler_console.cc: Use tty_min::status accessor methods throughout.
* fhandler_termios.cc: Ditto.
* winsup.h (__ISSETF): Remove.
(__SETF): Remove.
(__CLEARF): Remove.
(__CONDSETF): Remove.