* gpg-agent.c (handle_connections): Need to check for events if

select returns with -1.

* tools.texi (gpg-connect-agent): New.

* app-openpgp.c (get_one_do): Never try to get a non cacheable
object from the cache.
(get_one_do): Add new arg to return an error code.  Changed all
callers.
(do_getattr): Let it return a proper error code.

* app.c (select_application): Return an error code and the
application context in an new arg.
* command.c (open_card): Adjusted for that.  Don't use the
fallback if no card is present.  Return an error if the card has
been removed without a reset.
(do_reset, cmd_serialno): Clear that error flag.
(TEST_CARD_REMOVAL): New. Use it with all command handlers.

* scdaemon.c (ticker_thread): Termintate if a shutdown is pending.

* apdu.c: Added some PCSC error codes.
(pcsc_error_to_sw): New.
(reset_pcsc_reader, pcsc_get_status, pcsc_send_apdu)
(open_pcsc_reader): Do proper error code mapping.

* gpg-connect-agent.c: New.
* Makefile.am: Add it.

scd/scdaemon.c

@@ -936,7 +936,7 @@ ticker_thread (void *dummy_arg)
   sigs_ev = NULL;
 #endif
   
-  for (;;)
+  while (!shutdown_pending)
     {
       if (!time_ev)
         {
@@ -968,6 +968,7 @@ ticker_thread (void *dummy_arg)
     }
 
   pth_event_free (sigs_ev, PTH_FREE_ALL);
+  return NULL;
 }
 #endif /*USE_GNU_PTH*/
 #endif /*!HAVE_OPENSC*/