Martin Panter <vadmium...@gmail.com> added the comment:

Is this to get “spawn” working on a non-Linux platform like a recent Free BSD, 
OS X, or Solaris? If so, see Issue 26228.

If not, you might have to explain your use case better. Polling for the child 
exiting is going to race with handling the child’s output, and if there are 
other processes writing to the terminal after the child exits this will change 
the behaviour.

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nosy: +martin.panter

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<https://bugs.python.org/issue34785>
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