[tor-bugs] #3473 [Pluggable transport]: Better signal handling for obfsproxy

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#3473: Better signal handling for obfsproxy
---------------------------------+------------------------------------------
 Reporter:  asn                  |          Owner:  asn
     Type:  defect               |         Status:  new
 Priority:  normal               |      Milestone:     
Component:  Pluggable transport  |        Version:     
 Keywords:                       |         Parent:     
   Points:                       |   Actualpoints:     
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 We currently treat SIGINT and SIGTERM equally, by terminating obfsproxy
 asap.

 180-pluggable-transport.txt dictates that:
 '''
   Proxies should respond to a single INT signal by closing their
   listener ports and not accepting any new connections, but keeping
   all connections open, then terminating when connections are all
   closed.  Proxies should respond to a second INT signal by shutting
   down cleanly.
 '''

 I think we should conform SIGINT with the 180 spec, and leave SIGTERM as
 is.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3473>
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