[issue41625] Add splice() to the os module

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Nice, AIX can build again Python. But now the 3 tests fail since the test uses a pipe and a file, whereas on AIX, it seems like splice() requires one end to be a socket.

I wrote attached PR 23354 to skip the 3 tests on AIX.

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ERROR: test_splice (test.test_os.FileTests)
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Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.aixtools-aix-power6/build/Lib/test/test_os.py", line 406, in test_splice
    i = os.splice(in_fd, write_fd, 5)
OSError: [Errno 57] Socket operation on non-socket

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ERROR: test_splice_offset_in (test.test_os.FileTests)
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Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.aixtools-aix-power6/build/Lib/test/test_os.py", line 440, in test_splice_offset_in
    i = os.splice(in_fd, write_fd, bytes_to_copy, offset_src=in_skip)
OSError: [Errno 57] Socket operation on non-socket

======================================================================
ERROR: test_splice_offset_out (test.test_os.FileTests)
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Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.aixtools-aix-power6/build/Lib/test/test_os.py", line 479, in test_splice_offset_out
    i = os.splice(read_fd, out_fd, bytes_to_copy, offset_dst=out_seek)
OSError: [Errno 57] Socket operation on non-socket

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41625>
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