[tor-bugs] #21360 [Core Tor/Tor]: add controller event to track changes to 'getinfo onions/detached'

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#21360: add controller event to track changes to 'getinfo onions/detached'
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     Reporter:  mischief      |      Owner:
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.1.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 i have a program which adds a detached onion, and it has an option to
 block until a signal, and if a signal is received, the onion is deleted.

 however, if some other control connection deletes the onion, my program
 doesn't know it, and polling seems hackish.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21360>
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