Cautiously added ENABLE_DISABLE_FSYNC and disable_fsync, hedged about

[exim.git] / doc / doc-txt / NewStuff

diff --git a/doc/doc-txt/NewStuff b/doc/doc-txt/NewStuff
index 9cc8f81cc4da0eb993df2785be09d2fdf398d6cf..ac707ae4018a78ce146b300f159c3fed7f34c0fc 100644 (file)
--- a/doc/doc-txt/NewStuff
+++ b/doc/doc-txt/NewStuff
@@ -1,4 +1,4 @@
-$Cambridge: exim/doc/doc-txt/NewStuff,v 1.128 2007/01/18 15:35:42 ph10 Exp $
+$Cambridge: exim/doc/doc-txt/NewStuff,v 1.129 2007/01/22 16:29:54 ph10 Exp $

 
 New Features in Exim
 --------------------
 
 New Features in Exim
 --------------------


@@ -175,6 +175,17 @@ Version 4.67
     preference order for the cipher algorithms. The first one in the client's
     list that is also advertised by the server is tried first.
 
     preference order for the cipher algorithms. The first one in the client's
     list that is also advertised by the server is tried first.
 

+ 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. You must
+    not set this option unless you really, really, really understand what you
+    are doing. No pre-compiled distributions of Exim should ever set this
+    option. When it is set, Exim compiles a runtime option called
+    disable_fsync. If this is set true, Exim no longer calls fsync() to force
+    updated files' data to be written to disc. Unexpected events such as
+    crashes and power outages may cause data to be lost or scrambled. Beware.
+
+    When ENABLE_DISABLE_FSYNC is not set, a reference to disable_fsync in a
+    runtime configuration generates an "unknown option" error.
+

 
 Version 4.66
 ------------
 
 Version 4.66
 ------------