[docs] [issue25482] signal.set_wakeup_fd() doesn't work if the signal don't have handler

[Atsuo Ishimoto]

Atsuo Ishimoto added the comment:

Thank you for good sample. This should be written in PEP 475.

But installing new signal handler can cause different behavior. 

As in my previous example, if other 3rd party libraries(ncurses in my case) need to handle the signal, signal is consumed by Python handler and not delivered to the library.

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