diff -r 56cd8111b7f7 -r 41300fa6a67c src/network/socket/qabstractsocketengine_p.h
--- a/src/network/socket/qabstractsocketengine_p.h	Tue Jan 26 12:42:25 2010 +0200
+++ b/src/network/socket/qabstractsocketengine_p.h	Tue Feb 02 00:43:10 2010 +0200
@@ -126,6 +126,8 @@
     virtual qint64 pendingDatagramSize() const = 0;
 #endif
 
+    virtual qint64 bytesToWrite() const = 0;
+
     virtual int option(SocketOption option) const = 0;
     virtual bool setOption(SocketOption option, int value) = 0;