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Re: [PATCH] deprecate libnsl/libnss_*
- From: Thorsten Kukuk <kukuk at suse dot de>
- To: libc-alpha at sourceware dot org
- Date: Thu, 7 Apr 2016 11:54:03 +0200
- Subject: Re: [PATCH] deprecate libnsl/libnss_*
- Authentication-results: sourceware.org; auth=none
- References: <20160404134356 dot GA20216 at suse dot de> <5702780D dot 7070208 at redhat dot com> <20160404142237 dot GA20583 at suse dot de> <57062C77 dot 1080103 at redhat dot com>
On Thu, Apr 07, Florian Weimer wrote:
> So we now have code duplication between the external NSS modules and
> nss_files and nscd in glibc (on top of the components which are supposed
> to be obsolete). This isn't really desirable.
You mean the parser stuff? Yes, that's duplicate code, but I don't want
to export that with an official interface from glibc.
> libtirpc also pulls in a lot of libraries, which makes it less
> compatible with in-process NSS modules. I think it is generally assumed
> that the Sun PRC code in glibc was dead, but it is currently not due to
> nss_nis, and nss_nis is still relatively widely used. nss_nis linked
> against the current version of libtirpc likely has compatibility
> problems due to the additional libraries which it brings in, and the
> late loading of libpthread (in response to a NSS request).
Yes, libtirpc has some more dependencies, because it has rpcsec directly
included and don't need an extra library try to override glibc functions
But I don't understand why you see compatibility problemes here, except
that now, with external libnsl and libtirpc, libnss_nis also speaks with
IPv6 NIS servers.
The libnss_nis interface is the same, the interface to the yp_* functions
is the same, except that the external libnsl linked against libtirpc
speaks additional IPv6.
> We'll prepare things in Fedora for an external nss_nis implementation,
> but I'm not sure if it's a feasible approach with what we currently have.
It's the only way to communicate via IPv6.
Thorsten Kukuk, Senior Architect SLES & Common Code Base
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nuernberg, Germany
GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)