[Bug libc/10540] New: getaddrinfo() fails if /etc/hosts is missing, instead of falling through to nss_dns

["vorlon at debian dot org" <sourceware-bugzilla at sourceware dot org>]

glibc 2.10 introduces a regression in getaddrinfo(); with a standard nsswitch.conf:

$ grep host /etc/nsswitch.conf 
hosts:          files dns
$

and no /etc/hosts file on the system (which is legitimate; e.g., in a chroot):

$ cat /etc/hosts
cat: /etc/hosts: No such file or directory
$

all calls to getaddrinfo() will fail, short-circuited by an nss_files failure
before invoking nss_dns.

Trivial test case, patch to follow.

-- 
           Summary: getaddrinfo() fails if /etc/hosts is missing, instead of
                    falling through to nss_dns
           Product: glibc
           Version: 2.10
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: vorlon at debian dot org
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: x86_64-linux-gnu
  GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=10540

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