bpo-38319: Fix shutil._fastcopy_sendfile(): set sendfile() max block size (GH-16491) (#16506)
(cherry picked from commit 94e165096fd65e8237e60de570fb609604ab94c9)
Co-authored-by: Giampaolo Rodola <g.rodola@gmail.com>
diff --git a/Lib/shutil.py b/Lib/shutil.py
index 5c1255a..1e89256 100644
--- a/Lib/shutil.py
+++ b/Lib/shutil.py
@@ -135,9 +135,13 @@
# should not make any difference, also in case the file content
# changes while being copied.
try:
- blocksize = max(os.fstat(infd).st_size, 2 ** 23) # min 8MB
- except Exception:
- blocksize = 2 ** 27 # 128MB
+ blocksize = max(os.fstat(infd).st_size, 2 ** 23) # min 8MiB
+ except OSError:
+ blocksize = 2 ** 27 # 128MiB
+ # On 32-bit architectures truncate to 1GiB to avoid OverflowError,
+ # see bpo-38319.
+ if sys.maxsize < 2 ** 32:
+ blocksize = min(blocksize, 2 ** 30)
offset = 0
while True: