[Bug libc/7060] New: getaddrinfo() with hints.ai_family = PF_UNSPEC changes behavior in glibc 2.9

["bero at arklinux dot org" <sourceware-bugzilla at sourceware dot org>]

Up until glibc 2.8, this would work and return the IPv4 address:

struct addrinfo hints, *ai, *aitop;
int err;
char *host=strdup("www.google.com");
char *port=strdup("80");
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
err=getaddrinfo(host, port, &hints, &aitop);
if(err)
    fprintf(stderr, "Error: %s", strerror(err));


In glibc 2.9, it returns Error: Name or service not known
Changing hints.ai_family to PF_INET makes it work with glibc 2.9.

I'm not sure which behavior is correct, but 2.9's does break a few 
applications (ncftp for one).

This is on an IPv4 machine (with an IPv6 address for localhost set); 
nsswitch.conf has "hosts: files mdns dns"

-- 
           Summary: getaddrinfo() with hints.ai_family = PF_UNSPEC changes
                    behavior in glibc 2.9
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: bero at arklinux dot org
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=7060

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