Date: Mon, 11 Jun 2001 09:31:31 -0500 From: "Jacques A. Vidrine" <n@nectar.com> To: Peter Wemm <peter@wemm.org> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: nsswitch dynamically loadable modules Message-ID: <20010611093131.A17422@shade.nectar.com> In-Reply-To: <20010611001723.C9A7F380E@overcee.netplex.com.au>; from peter@wemm.org on Sun, Jun 10, 2001 at 05:17:23PM -0700 References: <20010610200113.T89118-100000@fourier.szit.bme.hu> <20010611001723.C9A7F380E@overcee.netplex.com.au>
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On Sun, Jun 10, 2001 at 05:17:23PM -0700, Peter Wemm wrote:
> This is probably why it wont be committed. If it uses dlopen() then it
> cannot work for the statically linked /bin/ls, /bin/sh, etc. Anything in /
> sbin or /bin will never be able to see the usernames. If you built the
> entire system with NOSHARED=NO, then /bin/ls, /bin/sh etc will be dynamically
> linked and the patches will probably work. However, you had better have
> /usr on your root (/) file system or you wont be able to boot. Linux's
> solution is to put the ld.so and libc.so onto the / partition in /lib.
This is the evolution I have in mind:
nsswitch static only (FreeBSD-CURRENT today)
|
V
nsswitch w/static support for files, dns, nis; modules can be added
for other sources; these modules may be compiled statically as part
of libc, but would generally be loaded dynamically (this is roughly
the stage the prototype was at)
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V
`module' implementing stubs to communicate with an external process;
the external process itself can dynamically load other modules (this
is my target before my next commit to -CURRENT)
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V
(finished) the stub/external process module is a standard way of
providing additional sources, giving three ways to `link' in modules:
static, dynamic, stub
The static & stub cases would support all executables; the dynamic
case of course would only be available for dynamically-linked
executables.
Supporting the `stub' case was the primary cause for designing a new
nsdispatch() API.
Cheers,
--
Jacques Vidrine / n@nectar.com / jvidrine@verio.net / nectar@FreeBSD.org
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