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[Bug network/14415] New: AI_V4MAPPED is useless with AI_UNSPEC but they're used together as defaults when hints=NULL


http://sourceware.org/bugzilla/show_bug.cgi?id=14415

             Bug #: 14415
           Summary: AI_V4MAPPED is useless with AI_UNSPEC but they're used
                    together as defaults when hints=NULL
           Product: glibc
           Version: 2.15
            Status: NEW
          Severity: minor
          Priority: P2
         Component: network
        AssignedTo: unassigned@sourceware.org
        ReportedBy: psimerda@redhat.com
    Classification: Unclassified


>From 'man getaddrinfo':

  Specifying hints as NULL is equivalent to  setting  ai_socktype and
  ai_protocol to 0; ai_family to AF_UNSPEC; and ai_flags to
  (AI_V4MAPPED | AI_ADDRCONFIG).

  ...

  If hint.ai_flags specifies the AI_V4MAPPED flag, and hints.ai_family
  was specified as  AF_INET6, and no  matching IPv6 addresses could be
  found, then return IPv4-mapped IPv6 addresses in the list pointed to
  by res. If both AI_V4MAPPED and AI_ALL are specified in hints.ai_flags,
  then return both IPv6 and IPv4-mapped IPv6 addresses in the list pointed
  to by res. AI_ALL is ignored if AI_V4MAPPED is not also specified.

As I read it, AI_V4MAPPED is useless without AF_INET6. So either it is wrong,
or I miss something about AI_V4MAPPED that should be documented in the manpage.

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