mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-08-04 00:48:58 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 8

bpo-24658: Fix read/write greater than 2 GiB on macOS (GH-1705)

Browse source 
On macOS, fix reading from and writing into a file with a size larger than 2 GiB.
This commit is contained in:
Stéphane Wirtel 2018-10-18 01:05:04 +02:00 • committed by Victor Stinner
parent 0f11a88622
commit 74a8b6ea7e
5 changed files with 33 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

13
Lib/test/test_largefile.py
View file

@ -5,12 +5,12 @@ import os
import stat
import sys
import unittest
from test.support import TESTFN, requires, unlink
from test.support import TESTFN, requires, unlink, bigmemtest
import io # C implementation of io
import _pyio as pyio # Python implementation of io
# size of file to create (>2 GiB; 2 GiB == 2,147,483,648 bytes)
size = 2500000000
size = 2_500_000_000
class LargeFileTest:
"""Test that each file function works as expected for large
@ -45,6 +45,15 @@ class LargeFileTest:
raise cls.failureException('File was not truncated by opening '
'with mode "wb"')
# _pyio.FileIO.readall() uses a temporary bytearray then casted to bytes,
# so memuse=2 is needed
@bigmemtest(size=size, memuse=2, dry_run=False)
def test_large_read(self, _size):
# bpo-24658: Test that a read greater than 2GB does not fail.
with self.open(TESTFN, "rb") as f:
self.assertEqual(len(f.read()), size + 1)
self.assertEqual(f.tell(), size + 1)
def test_osstat(self):
self.assertEqual(os.stat(TESTFN)[stat.ST_SIZE], size+1)