Trapping signals in Python

Question

According to the documentation :

It is not possible to temporarily “block” signals from critical sections (since this is not supported by all Unix tastes).

What prevents me from using signal.signal(signum,SIG_IGN)to block it and then add a signal?

Answer 1

What stops you is that if the signal really comes and SIG_IGN is in place, it will be ignored and thrown away. When you add a signal later, it is too late because it has disappeared and you will never know that it happened.

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