[issue16105] Pass read only FD to signal.set_wakeup_fd

[Charles-François Natali]

Charles-François Natali added the comment:

> A signal handler can be called anymore, anywhere. How do you handle such
> exception in an application? "handle": do something better than exit the
> apllication.

Well, chances are you won't, but failing with an explicit error
message is better than silently failing to deliver signals (which may
result in a deadlock, for example).

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