Is libresolv part of glibc?

[Florian Weimer]

* Nikolaos Chatzikonstantinou:

> On Thu, Nov 7, 2024 at 3:06 AM Florian Weimer <fweimer@redhat.com> wrote:
>>
>> * Nikolaos Chatzikonstantinou via Libc-help:
>>
>> > Could you please clarify if libresolv is part of glibc, and if so,
>> > where can I read more about it?
>>
>> On GNU systems, libresolv is provided by glibc.  The code originated
>> with mostly BIND 4 (with some parts taken from early BIND 8 releases).
>> I don't know where it is documented in full (Stevens, UNIX Network
>> Programming only describes only a tiny part of it).
>>
>> In general, if you need a DNS client library, you should consider
>> looking elsewhere.  The code is very old and difficult to maintain for
>> various reasons.
>
> Thank you for clarifying. I've since located the code under the
> resolv/ directory of the glibc repository. Should this information be
> part of resolv/README and the glibc manual? To have a note
> discouraging users from using it in new projects. If you'd like, I'll
> send a patch.

We don't have documentation for these functions, so there isn't a good
place to add this information.  A README file in the source tree is
unlikely to be helpful.  We added some deprecation warnings to
<resolv.h>, but I'm not sure if this is the right approach for the more
widely-used functions.

Thanks,
Florian