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gh-44883: improve the docs about select to explain what select can access #134293

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improve the docs about select to explain what select can access
chrisgramberg678 May 19, 2025
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chrisgramberg678 May 20, 2025
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8 changes: 8 additions & 0 deletions Doc/library/select.rst
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Expand Up @@ -158,6 +158,14 @@ The module defines the following:
library, and does not handle file descriptors that don't originate from
WinSock.

.. note::

:c:func:`!select` may not work with file objects that
internally buffer data because select is only aware of data in the
file descriptor provided by the kernel. However, :term:`file-like objects <file object>` often
contain a reference to a file descriptor via a :meth:`!fileno` method
which will work with select.

.. versionchanged:: 3.5
The function is now retried with a recomputed timeout when interrupted by
a signal, except if the signal handler raises an exception (see
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