diff -r 56cd8111b7f7 -r 41300fa6a67c src/network/socket/qnativesocketengine_p.h
--- a/src/network/socket/qnativesocketengine_p.h	Tue Jan 26 12:42:25 2010 +0200
+++ b/src/network/socket/qnativesocketengine_p.h	Tue Feb 02 00:43:10 2010 +0200
@@ -135,6 +135,8 @@
     bool hasPendingDatagrams() const;
     qint64 pendingDatagramSize() const;
 
+    qint64 bytesToWrite() const;
+
     qint64 receiveBufferSize() const;
     void setReceiveBufferSize(qint64 bufferSize);