Jeroen Demeyer added the comment:

Here is a proposal for an API:

* getsignal: return the Python-level signal handler (this is an existing 
function)

* setsignal: set the Python-level signal handler (but not the OS-level signal 
handler)

* getossignal: get the OS-level signal handler as opaque object

* setossignal: set the OS-level signal handler with an opaque object

Using these primitives, you could implement anything that you want on a higher 
level.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13285>
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