process: do not kill spawned processes on drop (#1814)

This updates the tokio `Command` and `Child` behavior to match that of
the stdlib: spawned processes will *not* be automatically killed when
the handle is dropped

Unlike the stdlib, any dropped (unix) processes may be reaped by tokio
behind-the-scenes after they exit and if new processes are awaited,
which mitigates the risks of piling up unreaped zombie unix processes

A `Command::kill_on_drop` method is added to allow the caller to
control whether the spawned child should be killed when the handle is
dropped. By default, this value is `false`.

The `Child::forget` method has been removed, as it is superseded by
`Command::kill_on_drop`

0 files changed, 0 insertions, 0 deletions