Write+move instead of rewrite for dnsseed.dat

main.cpp

@@ -270,11 +270,14 @@ extern "C" void* ThreadDumper(void*) {
   do {
     Sleep(100000);
     {
-      FILE *f = fopen("dnsseed.dat","w+");
+      FILE *f = fopen("dnsseed.dat.new","w+");
       if (f) {
+        {
           CAutoFile cf(f);
           cf << db;
         }
+        rename("dnsseed.dat.new", "dnsseed.dat");
+      }
       FILE *d = fopen("dnsseed.dump", "w");
       vector<CAddrReport> v = db.GetAll();
       sort(v.begin(), v.end(), StatCompare);