From 87c88faa88c33cdc927868a09025ab23f77c0208 Mon Sep 17 00:00:00 2001
From: AN Long <aisk@users.noreply.github.com>
Date: Thu, 23 Nov 2023 22:26:20 +0800
Subject: [PATCH] using transmitfile for sendfile on windows

---
 Lib/socket.py                                                   | 2 ++
 .../next/Windows/2023-11-23-22-25-16.gh-issue-65920.6wWsHN.rst  | 1 +
 2 files changed, 3 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Windows/2023-11-23-22-25-16.gh-issue-65920.6wWsHN.rst

diff --git a/Lib/socket.py b/Lib/socket.py
index b1d66574620..431cbb39e6d 100644
--- a/Lib/socket.py
+++ b/Lib/socket.py
@@ -514,6 +514,8 @@ def sendfile(self, file, offset=0, count=None):
         The socket must be of SOCK_STREAM type.
         Non-blocking sockets are not supported.
         """
+        if sys.platform == "win32":
+            return self._sendfile_use_transmitfile(file, offset, count)
         try:
             return self._sendfile_use_sendfile(file, offset, count)
         except _GiveupOnSendfile:
diff --git a/Misc/NEWS.d/next/Windows/2023-11-23-22-25-16.gh-issue-65920.6wWsHN.rst b/Misc/NEWS.d/next/Windows/2023-11-23-22-25-16.gh-issue-65920.6wWsHN.rst
new file mode 100644
index 00000000000..ff0923890ea
--- /dev/null
+++ b/Misc/NEWS.d/next/Windows/2023-11-23-22-25-16.gh-issue-65920.6wWsHN.rst
@@ -0,0 +1 @@
+Use ``TransmitFile`` on Windows to implement ``socket.sendfile``.