[docs] [issue25787] Add an explanation what happens with subprocess parent and child processes when signals are sent

[Karl Richter]

Karl Richter added the comment:

Please also explain how to deal with process replacement in child processes (assuming that http://stackoverflow.com/questions/34059576/how-to-register-a-signal-handler-for-a-subprocess/34065587#34065587 is correct).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25787>
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