[docs] [issue19876] selectors (and asyncio?): document behaviour on closed files/sockets

[Charles-François Natali]

Charles-François Natali added the comment:

The test is failing on Windows buildbot:
http://buildbot.python.org/all/builders/x86%20Windows%20Server%202003%20%5BSB%5D%203.x/builds/1851/steps/test/logs/stdio
"""
======================================================================
ERROR: test_unregister_after_fd_close_and_reuse (test.test_selectors.DefaultSelectorTestCase)
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Traceback (most recent call last):
  File "E:\Data\buildslave\cpython\3.x.snakebite-win2k3r2sp2-x86\build\lib\test\test_selectors.py", line 122, in test_unregister_after_fd_close_and_reuse
    os.dup2(rd2.fileno(), r)
OSError: [Errno 9] Bad file descriptor

======================================================================
ERROR: test_unregister_after_fd_close_and_reuse (test.test_selectors.SelectSelectorTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "E:\Data\buildslave\cpython\3.x.snakebite-win2k3r2sp2-x86\build\lib\test\test_selectors.py", line 122, in test_unregister_after_fd_close_and_reuse
    os.dup2(rd2.fileno(), r)
OSError: [Errno 9] Bad file descriptor
"""

Apparently, dup2() doesn't work on Windows because on Windows, sockets aren't file descriptors, but a different beast...

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status: closed -> open

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<http://bugs.python.org/issue19876>
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