* fhandler.h (fhandler_tty_slave): Declare new methods.

* select.cc (fhandler_tty_slave::select_read): New method.
* select.cc (fhandler_tty_slave::ready_for_read): Ditto.
* select.cc (verify_tty_slave): New function.
* fhandler_termios.cc (fhandler_termios::line_edit): Empty input
buffer on signal.
* fhandler_tty.cc (fhandler_tty_slave::read): Check for input data
after reading from pipe. Reset event if input pipe is empty.
* tty.h (class tty): Allow creating events with manual reset.
* tty.cc (tty::get_event): Use manual_reset flag.
* tty.cc (tty::common_init): Create input_available_event with
manual reset.

winsup/cygwin/fhandler.h

@@ -761,6 +761,8 @@ public:
   int ioctl (unsigned int cmd, void *);
 
   off_t lseek (off_t, int) { return 0; }
+  select_record *select_read (select_record *s);
+  int ready_for_read (int fd, DWORD howlong, int ignra);
 };
 
 class fhandler_pty_master: public fhandler_tty_common