[3.12] gh-114077: Fix OverflowError in socket.sendfile() when pass count >2GiB (GH-114079) (GH-114110)

(cherry picked from commit d4dfad2)

Co-authored-by: Serhiy Storchaka <[email protected]>

Author: miss-islington

Lib/socket.py

@@ -382,7 +382,7 @@ def _sendfile_use_sendfile(self, file, offset=0, count=None):
                     if timeout and not selector_select(timeout):
                         raise TimeoutError('timed out')
                     if count:
-                        blocksize = count - total_sent
+                        blocksize = min(count - total_sent, blocksize)
                         if blocksize <= 0:
                             break
                     try:

Misc/NEWS.d/next/Library/2024-01-15-12-12-54.gh-issue-114077.KcVnfj.rst

@@ -0,0 +1,2 @@
+Fix possible :exc:`OverflowError` in :meth:`socket.socket.sendfile` when pass
+*count* larger than 2 GiB on 32-bit platform.