[issue13285] signal module ignores external signal changes

[Jeroen Demeyer]

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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<http://bugs.python.org/issue13285>
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