Throughout, change 'tty_attached' to 'real_tty_attached', for clarity.

Throughout, change 'OutputStopped' to 'output_stopped', for consistency.
* dtable.cc (stdio_init): Set controlling tty if not set by stdio opens.
* exceptions.cc (ctrl_c_handler): Avoid special pgid checking if no tty is
associated with the process.
(Suggested by Tim Baker <dbaker@direct.ca>)
* external.cc (fillout_pinfo): Return actual tty number for ctty.
* fhandler_console.cc (get_tty_stuff): Set ctty when shared memory is
allocated.  Accept flags input from open().
(set_console_ctty): New function.
(fhandler_console::open): Pass flags to get_tty_stuff and rely on this function
to set the ctty, if appropriate.
* fhandler_termios.cc (fhandler_termios::set_ctty): Move to tty_min class.
* fhandler_tty.cc (fhandler_tty_slave::open): Use tc field to access
set_ctty().
* tty.h (TTY_CONSOLE): Move to include/sys/cygwin.h.
(tty_min): Add set_ctty class here.
* include/sys/cygwin.h (TTY_CONSOLE): New home here.
* path.cc (symlink_info): Make contents an actual buffer.  Pass more flags to
case_check.
(path_conv::check): Reorganize to do parsing based on posix path rather than
native path.
(symlink_info::check): Expect posix path as input.  Translate to native path
here.  Accept path_conv flags.  Stop parsing if not a symlink regardless of
whether previous path was a symlink.

winsup/cygwin/fhandler_tty.cc

@@ -254,7 +254,7 @@ fhandler_pty_master::process_slave_output (char *buf, size_t len, int pktmode_on
     {
       /* We need to return a left over \n character, resulting from
 	 \r\n conversion.  Note that we already checked for FLUSHO and
-	 OutputStopped at the time that we read the character, so we
+	 output_stopped at the time that we read the character, so we
 	 don't check again here.  */
       buf[0] = '\n';
       need_nl = 0;
@@ -464,7 +464,7 @@ fhandler_tty_slave::open (const char *, int flags, mode_t)
   tcinit (cygwin_shared->tty[ttynum]);
 
   attach_tty (ttynum);
-  set_ctty (ttynum, flags);
+  tc->set_ctty (ttynum, flags);
 
   set_flags (flags);
   /* Create synchronisation events */