* fhandler_console.c (fhandler_console::read): Record the state of the SHIFT,

CTRL and ALT keys at the time of the last keyboard input event.
(fhandler_console::ioctl): Handle requests to retrieve the keyboard modifiers
via the TIOCLINUX command.
* fhandler_tty.c (fhandler_tty_slave::read): Ditto.
* include/sys/termios.h (TIOCLINUX): New macro definition.

winsup/cygwin/include/sys/termios.h

@@ -330,5 +330,6 @@ struct winsize
 
 #define TIOCGWINSZ (('T' << 8) | 1)
 #define TIOCSWINSZ (('T' << 8) | 2)
+#define TIOCLINUX  (('T' << 8) | 3)
 
 #endif	/* _SYS_TERMIOS_H */