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Readline key binding/function to repeat last searched character [closed]

With readline emacs keybindings, I'm aware that I can search forward or backward a character using ctrl+] and ctrl+alt+], respectively. I'm wondering if there's a way to repeat the last such searched ...
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How does emacs respond to Unix signals?

I'd like to know how GNU Emacs responds, by defaults, to such signals as HUP and USR1. Is this behavior documented in any manual? If so, where? If not, is there a place I could look in the source ...