[tor-bugs] #17638 [Tor]: Make ersatz_socketpair work on IPv6-only systems:

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#17638: Make ersatz_socketpair work on IPv6-only systems:
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 Reporter:  teor                         |          Owner:
     Type:  defect                       |         Status:  needs_review
 Priority:  Medium                       |      Milestone:  Tor:
Component:  Tor                          |  0.2.8.x-final
 Severity:  Normal                       |        Version:  Tor:
 Keywords:  easy ipv6 TorCoreTeam201511  |  unspecified
Parent ID:                               |     Resolution:
  Sponsor:                               |  Actual Points:
                                         |         Points:
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Changes (by teor):

 * status:  new => needs_review


Comment:

 Please see my branch bug17638-ipv6-ersatz-socketpair on
 https://github.com/teor2345/tor.git , which works on:

 * IPv4-only OS X (IPv6 link-local)
 * IPv4/IPv6 OS X (IPv6 tunnel)
 * IPv6-only OS X (IPv4 localhost)
 * IPv4-only Linux
 * IPv6-only Linux (IPv4 localhost)
 * IPv6-only FreeBSD jail (no IPv4 or IPv6 localhost) - by skipping the
 test on EINVAL, which is what we want - we don't want to be creating IP
 sockets on routable addresses in ersatz_socketpair

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17638#comment:1>
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