Add sigaction() versions that allow specify the signal by its number#2449

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ChrysoliteAzalea wants to merge 3 commits intonix-rust:masterfrom ChrysoliteAzalea:numeric_signals

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Commits on Jun 15, 2024

Add sigaction() versions that allow specify the signal by its number (to allow working with real-time signals) and replace the signal handler without retrieving the old one.
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Fix return value of nix::sys::signal::sigaction_noretrieve()
ChrysoliteAzalea
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cargo fmt
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