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[3.10] gh-91401: Conservative backport of subprocess._USE_VFORK (#91932)

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This does not alter the `_posixsubprocess.fork_exec()` private API to
avoid issues for anyone relying on that (bad idea) or for anyone who's
`subprocess.py` and `_posixsubprocess.so` upgrades may not become
visible to existing Python 3.10 processes at the same time.

Backports the concept of cd5726fe67.

Provides a fail-safe way to disable vfork for #91401.

I didn't backport the documentation as I don't actually expect this to be used and `.. versionadded: 3.10.5` always looks weird in docs. It's being done more to have a fail-safe in place for people just in case.
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Gregory P. Smith 2022-05-01 16:09:50 -07:00 • committed by GitHub
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Lib/subprocess.py
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@ -691,7 +691,10 @@ def _use_posix_spawn():
return False
# These are primarily fail-safe knobs for negatives. A True value does not
# guarantee the given libc/syscall API will be used.
_USE_POSIX_SPAWN = _use_posix_spawn()
_USE_VFORK = True
class Popen: