Issue 10882: add os.sendfile(). (patch provided by Ross Lagerwall)
diff --git a/Doc/whatsnew/3.3.rst b/Doc/whatsnew/3.3.rst
index 3e6da79..78d66fe 100644
--- a/Doc/whatsnew/3.3.rst
+++ b/Doc/whatsnew/3.3.rst
@@ -68,6 +68,19 @@
* Stub
+os
+--
+
+The :mod:`os` module has a new :func:`~os.sendfile` function which provides an
+efficent "zero-copy" way for copying data from one file (or socket) descriptor
+to another.
+The phrase "zero-copy" refers to the fact that all of the copying of data
+between the two descriptors is done entirely by the kernel, with no copying of
+data into userspace buffers.
+:func:`~os.sendfile` can be used to efficiently copy data from a file on disk to
+a network socket, e.g. for downloading a file.
+
+(Patch submitted by Ross Lagerwall and Giampaolo Rodolà in :issue:`10882`.)
Optimizations
=============