[Bug network/14990] New: getaddrinfo with servname=NULL returns addresses multiple times

["psimerda at redhat dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14990

             Bug #: 14990
           Summary: getaddrinfo with servname=NULL returns addresses
                    multiple times
           Product: glibc
           Version: 2.15
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
        AssignedTo: unassigned@sourceware.org
        ReportedBy: psimerda@redhat.com
    Classification: Unclassified


Testing in python:

>>> print(*getaddrinfo ("localhost", None), sep='\n')

Actual result:

(10, 1, 6, '', ('::1', 0, 0, 0))
(10, 2, 17, '', ('::1', 0, 0, 0))
(10, 3, 0, '', ('::1', 0, 0, 0))
(2, 1, 6, '', ('127.0.0.1', 0))
(2, 2, 17, '', ('127.0.0.1', 0))
(2, 3, 0, '', ('127.0.0.1', 0))

Expected result:

(10, 0, 0, '', ('::1', 0, 0, 0))
(2, 0, 0, '', ('127.0.0.1', 0))

POSIX1-2008:

If servname is null, the call shall return network-level addresses for the
specified nodename.

http://pubs.opengroup.org/onlinepubs/009604499/functions/getaddrinfo.html

Filling in the socktype and protocol is IMO not a good idea and returning
duplicate addresses prevents applications from using getaddrinfo for host name
resolution and violates POSIX.

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