[tor-bugs] #16630 [Tor]: Remove casting when registering signals

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#16630: Remove casting when registering signals
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 Reporter:  cypherpunks  |          Owner:
     Type:  enhancement  |         Status:  new
 Priority:  minor        |      Milestone:
Component:  Tor          |        Version:  Tor: unspecified
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
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 The current code for registering signals, `handle_signals`, uses casting
 to convert the signal type into a pointer. The result is a pointer where
 its address is the signal type instead of an actual memory location.

 This hack requires the callback functions `signal_callback` and
 `process_signal` to do the same hack in reverse to get the signal type
 back.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16630>
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