--- src/data/socket_file.cc.orig	2008-02-06 13:42:49.000000000 +0100
+++ src/data/socket_file.cc		2008-02-06 13:46:25.000000000 +0100
@@ -134,6 +134,16 @@
   if (!is_open())
     throw internal_error("SocketFile::set_size() called on a closed file");
 
+  #define CHUNK_SIZE 4096
+  int i, w;
+  char block[CHUNK_SIZE] = {0};
+
+  for (i=0, w=0; i<size; i+=w) {
+    w = write(m_fd, block, CHUNK_SIZE);
+    if (w == -1)
+      throw internal_error("SocketFile::write() failed");
+  }
+
   if (ftruncate(m_fd, size) == 0)
     return true;