python-useful-helpers / exec-helpers / 40909550263

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Do not fail killing a process that exits meanwhile

kill_proc_tree raised psutil.NoSuchProcess when the process exited after
it was found but before its children were listed or it was waited for.
On the error paths of Subprocess this replaced the error being handled,
for example the OSError of a failed STDIN write.

- A process that is gone when its children are listed counts as closed,
  as one that is gone when it is looked up already did.
- A process that is gone when it is waited for is ignored: the kill has
  reached its goal.

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