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

[Martin Panter]

Martin Panter added the comment:

I think Karl’s original report was mainly about normal signal handling in the long term in the child, i.e. behaviour after exec() succeeds.

Ian, your problem sounds more like a bug or unfortunate quirk of the window between fork() and exec(). Maybe it is possible to solve it by blocking or resetting signal handlers, or using posix_spawn() (Issue 20104).

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