New submission from Jarry Shaw <jarrys...@icloud.com>:

As in pty.spawn, once started, the parent process will be hanged, even if the 
child process is already dead (or a zombie), and must wait for a 
KeyboardInterrupt or else to terminate the whole process.

Thus, I propose to revise `_copy` function, where the parent process hung, to 
check if the child process is dead periodically and if so, terminate the whole 
process then return as shown in the patch file.

----------
components: Library (Lib)
files: pty-diff.patch
keywords: patch
messages: 326206
nosy: jarryshaw
priority: normal
severity: normal
status: open
title: pty.spawn -- auto-termination after child process is dead (a zombie)
type: enhancement
versions: Python 3.4, Python 3.5, Python 3.6, Python 3.7, Python 3.8
Added file: https://bugs.python.org/file47820/pty-diff.patch

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