[PATCH] resolv: Add test for getaddrinfo returning EAI_AGAIN on DNS failure

[Florian Weimer]

* H. J. Lu:

> On Tue, Sep 16, 2025 at 12:43 PM Sergey Kolosov <skolosov@redhat.com> wrote:
>>
>> Test for BZ #16849. This test verifies that getaddrinfo correctly
>> returns the EAI_AGAIN error code when DNS queries fail due to a network
>> failure. The test queries with AF_INET, AF_INET6, AF_UNSPEC address
>> families and expects getaddrinfo to return EAI_AGAIN in each case.
>> ---
>> To validate the test, I manually reverted the fix for BZ #16849 in
>> nss/getaddrinfo.c, specifically the condition:
>
> Is it possible to write a container test with network/DNS disabled?

It is, but it would test something else (ICMP error from unreachable UDP
port).  It could still be a useful additional test.

Thanks,
Florian