bug#23483: 24.5; cygwin emacs w32 doesn not ask to save files when windows shuts down

[Ken Brown <kbrown@cornell.edu>]

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On 5/10/2016 12:32 PM, Eli Zaretskii wrote:
> What I think we need to do instead is send a message to the main
> thread that will produce a special event, and then bind that event to
> kill-emacs (probably in special-event-map).

Thanks.  My attempt to implement this is attached.

Ken


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diff --git a/src/keyboard.c b/src/keyboard.c
index 92d5c30..fe04b3f 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -3893,6 +3893,16 @@ kbd_buffer_get_event (KBOARD **kbp,
 	  kbd_fetch_ptr = event + 1;
 	}
 #endif
+
+#ifdef HAVE_NTGUI
+      else if (event->kind == END_SESSION_EVENT)
+	{
+	  /* Make an event (end-session).  */
+	  obj = list1 (Qend_session);
+	  kbd_fetch_ptr = event + 1;
+	}
+#endif
+
 #if defined (HAVE_X11) || defined (HAVE_NTGUI) \
     || defined (HAVE_NS)
       else if (event->kind == ICONIFY_EVENT)
@@ -10984,6 +10994,7 @@ syms_of_keyboard (void)
 
 #ifdef HAVE_NTGUI
   DEFSYM (Qlanguage_change, "language-change");
+  DEFSYM (Qend_session, "end-session");
 #endif
 
 #ifdef HAVE_DBUS
@@ -11758,6 +11769,10 @@ keys_of_keyboard (void)
 
   initial_define_lispy_key (Vspecial_event_map, "delete-frame",
 			    "handle-delete-frame");
+#ifdef HAVE_NTGUI
+  initial_define_lispy_key (Vspecial_event_map, "end-session",
+			    "kill-emacs");
+#endif
   initial_define_lispy_key (Vspecial_event_map, "ns-put-working-text",
 			    "ns-put-working-text");
   initial_define_lispy_key (Vspecial_event_map, "ns-unput-working-text",
diff --git a/src/termhooks.h b/src/termhooks.h
index d21d6ce..ff74d99 100644
--- a/src/termhooks.h
+++ b/src/termhooks.h
@@ -158,6 +158,9 @@ enum event_kind
   SELECTION_CLEAR_EVENT,	/* Another X client cleared our selection.  */
   BUFFER_SWITCH_EVENT,		/* A process filter has switched buffers.  */
   DELETE_WINDOW_EVENT,		/* An X client said "delete this window".  */
+#ifdef HAVE_NTGUI
+  END_SESSION_EVENT,		/* The user is logging out or shutting down.  */
+#endif
   MENU_BAR_EVENT,		/* An event generated by the menu bar.
 				   The frame_or_window field's cdr holds the
 				   Lisp-level event value.
diff --git a/src/w32fns.c b/src/w32fns.c
index ede8f6b..7a1f84a 100644
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -4795,6 +4795,11 @@ w32_wnd_proc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
       my_post_msg (&wmsg, hwnd, msg, wParam, lParam);
       return 0;
 
+    case WM_ENDSESSION:
+      my_post_msg (&wmsg, hwnd, msg, wParam, lParam);
+      /* If we return, the process will be terminated immediately.  */
+      sleep (1000);
+
     case WM_WINDOWPOSCHANGING:
       /* Don't restrict the sizing of any kind of frames.  If the window
 	 manager doesn't, there's no reason to do it ourselves.  */
diff --git a/src/w32term.c b/src/w32term.c
index 74ea6b5..72e1245 100644
--- a/src/w32term.c
+++ b/src/w32term.c
@@ -5260,6 +5260,10 @@ w32_read_socket (struct terminal *terminal,
 	    }
 	  break;
 
+	case WM_ENDSESSION:
+	  inev.kind = END_SESSION_EVENT;
+	  break;
+
 	case WM_INITMENU:
 	  f = x_window_to_frame (dpyinfo, msg.msg.hwnd);