Even though Python marks any handles it opens as non-inheritable there
is still a race when using `subprocess.Popen` since creating a process
with redirected stdio requires temporarily creating inheritable handles.
By implementing support for `subprocess.Popen(close_fds=True)` we fix
this race.
In order to implement this we use PROC_THREAD_ATTRIBUTE_HANDLE_LIST
which is available since Windows Vista. Which allows to pass an explicit
list of handles to inherit when creating a process.
This commit also adds `STARTUPINFO.lpAttributeList["handle_list"]`
which can be used to control PROC_THREAD_ATTRIBUTE_HANDLE_LIST
directly.
* Fixes#30581 by adding a path to use newer GetMaximumProcessorCount API on Windows calls to os.cpu_count()
* Add NEWS.d entry for bpo-30581, os.cpu_count on Windows.
* Tweak NEWS entry
* bpo-30362 Add list options to launcher.
* bpo-30362 Add list options to help message.
* To avoid possible later conflict with python replaced flags with --launcher-list and --launcher-list-paths
* bpo-30362 Changed flag to -0 as suggested on review.
* bpo-30362: Modified to default to not path for -0, -0p to dispaly path and append * to default
* bpo-30362: Modified to display list on required version not found.
* bpo-30362 add --list and --list-paths added back in following review by paul.moore
* bpo-30362 Cleaner handing of -0 & -0p by not calling exit directly per review by @zooba
* bpo-30362: Tidy up and add news & what's new
Removed commented out line of code in PC/launcher.c.
Added the results of using blurb to add details of bpo-30362 & bpo-30291.
Updated Doc/whatsnew/3.7.rst to add a Windows only section covering both tickets.
* bpo-30362 Resolve conflict in Doc/whatsnew/3.7.rst
* bpo-30362:Address Whitespace Issue in Doc\whatsnew\3.7.rst
* Shorten NEWS message for bpo-30362
* Shorten NEWS item for bpo-30291
Add "Misc/NEWS.d" directory tree for "blurb".
CPython workflow is changing! We're going to start using "blurb"
to manage Misc/NEWS entries:
https://github.com/python/core-workflow
(This will be a big win for release managers, honest.)
This checkin simply populates the "Misc/NEWS.d" subdirectory tree
so that people can start putting their news entries in there.
No other changes (yet).
Ned Deily
Steve Dower
Segev Finer
Berker Peksag
pdox
Zachary Ware
Gregory P. Smith
larryhastings
Christopher Wilcox
Steve (Gadget) Barnes