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bpo-38319: Fix shutil._fastcopy_sendfile(): set sendfile() max block size (GH-16491)

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Giampaolo Rodola 2019-10-01 11:40:54 +08:00 • committed by GitHub
parent cf57cabef8
commit 94e165096f
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3 changed files with 11 additions and 5 deletions
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10
Lib/shutil.py
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@ -135,9 +135,13 @@ def _fastcopy_sendfile(fsrc, fdst):
# 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: