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Clarify fd inheritance when close_fds=False. (GH-6240) 

Clarify the subprocess documentation.
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Gregory P. Smith 2018-03-25 10:27:59 -07:00 committed by GitHub
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Doc/library/subprocess.rst
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@ -459,7 +459,10 @@ functions.
common use of *preexec_fn* to call os.setsid() in the child. common use of *preexec_fn* to call os.setsid() in the child.
If *close_fds* is true, all file descriptors except :const:`0`, :const:`1` and If *close_fds* is true, all file descriptors except :const:`0`, :const:`1` and
:const:`2` will be closed before the child process is executed. :const:`2` will be closed before the child process is executed. Otherwise
when *close_fds* is false, file descriptors obey their inheritable flag
as described in :ref:`fd_inheritance`.
On Windows, if *close_fds* is true then no handles will be inherited by the On Windows, if *close_fds* is true then no handles will be inherited by the
child process unless explicitly passed in the ``handle_list`` element of child process unless explicitly passed in the ``handle_list`` element of
:attr:`STARTUPINFO.lpAttributeList`, or by standard handle redirection. :attr:`STARTUPINFO.lpAttributeList`, or by standard handle redirection.