Richard Oudkerk added the comment:
> The safest default would be fork+exec though we need to implement the
> fork+exec code as a C extension module or have it use subprocess (as I
> noted in the mb_fork_exec.patch review).
That was an old version of the patch.
In the branch
http://hg.python.org/sandbox/sbt#spawn
_posixsubprocess is used instead of fork+exec, and all unnecessary fds are
closed. See
http://hg.python.org/sandbox/sbt/file/8f08d83264a0/Lib/multiprocessing/popen_spawn_posix.py
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