gio: add G_IO_ERROR_NOT_CONNECTED

It adds a new error G_IO_ERROR_NOT_CONNECTED
and makes the win32 error ERROR_PIPE_LISTENING
to be translated to it.

https://bugzilla.gnome.org/show_bug.cgi?id=741016

gio/gioenums.h

@@ -475,6 +475,7 @@ typedef enum {
  *     "connection closed" errors returned %G_IO_ERROR_BROKEN_PIPE, but others
  *     returned %G_IO_ERROR_FAILED. Now they should all return the same
  *     value, which has this more logical name. Since 2.44.
+ * @G_IO_ERROR_NOT_CONNECTED: Transport endpoint is not connected. Since 2.44
  *
  * Error codes returned by GIO functions.
  *
@@ -539,6 +540,7 @@ typedef enum {
   G_IO_ERROR_PROXY_NOT_ALLOWED,
   G_IO_ERROR_BROKEN_PIPE,
   G_IO_ERROR_CONNECTION_CLOSED = G_IO_ERROR_BROKEN_PIPE
+  G_IO_ERROR_NOT_CONNECTED
 } GIOErrorEnum;
 
 

gio/gioerror.c

@@ -314,6 +314,9 @@ g_io_error_from_win32_error (gint error_code)
     case WSAECONNRESET:
       return G_IO_ERROR_CONNECTION_CLOSED;
 
+    case ERROR_PIPE_LISTENING:
+      return G_IO_ERROR_NOT_CONNECTED;
+
     default:
       return G_IO_ERROR_FAILED;
     }