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[3.7] Clarify fd inheritance when close_fds=False. (GH-6240) #6241

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Merged
miss-islington merged 1 commit into from
Mar 25, 2018
Merged

[3.7] Clarify fd inheritance when close_fds=False. (GH-6240) #6241

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5 changes: 4 additions & 1 deletion Doc/library/subprocess.rst
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Expand Up @@ -459,7 +459,10 @@ functions.
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
: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
child process unless explicitly passed in the ``handle_list`` element of
:attr:`STARTUPINFO.lpAttributeList`, or by standard handle redirection.
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