scd: Enable card removal check after select_application.

* scd/apdu.c (open_ccid_reader): Fix error handling of ccid_get_atr.
* scd/app.c (select_application): Always kick the loop if new APP.
* scd/ccid-driver.c (ccid_open_usb_reader): Don't setup at open.
(ccid_slot_status): Setup interrupt transfer when !ON_WIRE.

--

We can use the interrupt transfer to be notified about card status
change.  In this case, we don't need to issue PC_to_RDR_GetSlotStatus
command.  This change improve the setup the notification; it should be
done after registration of APP.

When the setup is done just after opening the USB connection (before
issuing PC_to_RDR_IccPowerOn), a reader might notifies about no card
availability (because of not yet powered on), even though the card is
ready to be powered on.

GnuPG-bug-id: 3508
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>

scd/apdu.c

@@ -1497,8 +1497,13 @@ open_ccid_reader (struct dev_list *dl)
   err = ccid_open_reader (dl->portstr, dl->idx, dl->ccid_table,
                           &slotp->ccid.handle, &slotp->rdrname);
   if (!err)
-    err = ccid_get_atr (slotp->ccid.handle,
+    {
-                        slotp->atr, sizeof slotp->atr, &slotp->atrlen);
+      err = ccid_get_atr (slotp->ccid.handle,
+                          slotp->atr, sizeof slotp->atr, &slotp->atrlen);
+      if (err)
+        ccid_close_reader (slotp->ccid.handle);
+    }
+
   if (err)
     {
       slotp->used = 0;

scd/app.c

@@ -323,7 +323,7 @@ select_application (ctrl_t ctrl, const char *name, app_t *r_app,
   if (scan || !app_top)
     {
       struct dev_list *l;
-      int periodical_check_needed = 0;
+      int new_app = 0;
 
       /* Scan the devices to find new device(s).  */
       err = apdu_dev_list_start (opt.reader_port, &l);
@@ -349,8 +349,7 @@ select_application (ctrl_t ctrl, const char *name, app_t *r_app,
             {
               err = app_new_register (slot, ctrl, name,
                                       periodical_check_needed_this);
-              if (periodical_check_needed_this)
+              new_app++;
-                periodical_check_needed = 1;
             }
 
           if (err)
@@ -359,9 +358,8 @@ select_application (ctrl_t ctrl, const char *name, app_t *r_app,
 
       apdu_dev_list_finish (l);
 
-      /* If periodical check is needed for new device(s), kick the
+      /* If new device(s), kick the scdaemon loop.  */
-       scdaemon loop.  */
+      if (new_app)
-      if (periodical_check_needed)
         scd_kick_the_loop ();
     }
 

scd/ccid-driver.c

@@ -1661,9 +1661,6 @@ ccid_open_usb_reader (const char *spec_reader_name,
         }
     }
 
-  if ((*handle)->ep_intr >= 0)
-    ccid_setup_intr (*handle);
-
   rc = ccid_vendor_specific_init (*handle);
 
  leave:
@@ -2311,6 +2308,11 @@ ccid_slot_status (ccid_driver_t handle, int *statusbits, int on_wire)
      no need to send on wire.  */
   if (!on_wire && !ccid_require_get_status (handle))
     {
+      /* Setup interrupt transfer at the initial call of slot_status
+         with ON_WIRE == 0 */
+      if (handle->transfer == NULL && handle->ep_intr >= 0)
+        ccid_setup_intr (handle);
+
       *statusbits = 0;
       return 0;
     }
@@ -3748,7 +3750,7 @@ main (int argc, char **argv)
   if (!no_poll)
     ccid_poll (ccid);
   fputs ("getting slot status ...\n", stderr);
-  rc = ccid_slot_status (ccid, &slotstat);
+  rc = ccid_slot_status (ccid, &slotstat, 1);
   if (rc)
     {
       print_error (rc);

scd/scdaemon.c

@@ -1003,6 +1003,7 @@ handle_signal (int signo)
 
     case SIGCONT:
       /* Nothing.  */
+      log_debug ("SIGCONT received - breaking select\n");
       break;
 
     case SIGTERM: