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gh-87909: avoid a 0 bytes copy call to sendfile() #101231

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@gpshead gpshead commented Jan 22, 2023 •
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That triggers an EAGAIN error on a minority of kernels and filesystems.

Based on a patch suggestion by pmrv (see the linked issue).

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pythongh-87909: avoid a 0 bytes copy call to sendfile()
6b07ef9 
That triggers an EAGAIN error on a minority of kernels and filesystems.
@gpshead gpshead added type-bug An unexpected behavior, bug, or error needs backport to 3.10 only security fixes stdlib Python modules in the Lib dir needs backport to 3.11 only security fixes labels Jan 22, 2023
@gpshead gpshead self-assigned this Jan 22, 2023
@bedevere-bot bedevere-bot mentioned this pull request Jan 22, 2023
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@gpshead gpshead marked this pull request as draft January 22, 2023 02:57
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gpshead commented Jan 22, 2023

I turned the old patch on the issue into this PR... it's clearly not right based on existing tests:

test_exception_on_second_call (test.test_shutil.TestZeroCopySendfile.test_exception_on_second_call) ... FAIL
test_small_chunks (test.test_shutil.TestZeroCopySendfile.test_small_chunks) ... FAIL

======================================================================
FAIL: test_exception_on_second_call (test.test_shutil.TestZeroCopySendfile.test_exception_on_second_call)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/runner/work/cpython/cpython-ro-srcdir/Lib/test/test_shutil.py", line 2565, in test_exception_on_second_call
    with self.assertRaises(OSError) as cm:
AssertionError: OSError not raised

======================================================================
FAIL: test_small_chunks (test.test_shutil.TestZeroCopySendfile.test_small_chunks)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/runner/work/cpython/cpython-ro-srcdir/Lib/test/test_shutil.py", line 2591, in test_small_chunks
    self.assertEqual(read_file(TESTFN2, binary=True), self.FILEDATA)
AssertionError: b'Qcj[83[886](https://github.com/python/cpython/actions/runs/3977715463/jobs/6819054400#step:17:887)00 chars]vKQMs' != b'Qcj[8388600 chars]vKQMsQcjlcBkZjwawMTZtHYhdRhukiOdKiAFKthzsKfEAa[2097107 chars]KQMs'

----------------------------------------------------------------------
Ran 2 tests in 1.977s

FAILED (failures=2)
test test_shutil failed
1 test failed again:
    test_shutil

@gpshead gpshead removed their assignment Jan 22, 2023
@hugovk hugovk removed the needs backport to 3.10 only security fixes label Apr 7, 2023
@serhiy-storchaka serhiy-storchaka added needs backport to 3.12 only security fixes needs backport to 3.13 bugs and security fixes and removed needs backport to 3.11 only security fixes labels May 9, 2024
@hugovk hugovk removed the needs backport to 3.12 only security fixes label Apr 26, 2025
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hugovk commented Apr 26, 2025

This old patch didn't work out, shall we close it?

@hugovk hugovk added the pending The issue will be closed if no feedback is provided label Apr 26, 2025
@gpshead gpshead closed this Apr 26, 2025
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