5.3-RELEASE TODO

Matthias Andree matthias.andree at uni-dortmund.de
Sat Oct 9 04:05:06 PDT 2004


Jacques A. Vidrine schrieb am 2004-10-08:

> > All that is needed is that interfaces that cannot communicate a
> > temporary failure and do not fail when used without NIS (such as
> > getpw*()) retry forever until they can offer a permanent result.
> 
> Though your PR may have merit, this is not a "showstopper bug" for
> 5.3.  FreeBSD has this behavior since the dawn of time, as does Linux
> (IIRC).

About time this was fixed then after such a long period of falsely
claiming that existing users were nonexistent within periods of
NIS/network trouble.

Linux's (GNU libc's, to be precise) current behaviour is nothing more
than a poor and incomplete copy of Solaris' "name service switch"
interface - Linux lacks TRYAGAIN=forever functionality with is the
default on Solaris for anything but DNS (and the DNS-related interfaces
such as gethostbyname DO have a means to distinguish temporary from
permanent error).

The problem is that the current code, in case of a temporary problem,
pretends that there was a permanent condition, and this must end, very
few applications (if any) check for errno.

Convenience link:
http://www.freebsd.org/cgi/man.cgi?query=nsswitch.conf&apropos=0&sektion=0&manpath=SunOS+5.8&format=html

What _technical_ reason is there that prevents a fix? (don't tell me
we've been doing this for so long or WackOS XYZ has been doing this for
so long). Currently, FreeBSD's NIS implementation is a fair weather
implementation.

The issue at hand is also found to be annoying and reported by other
people, see for instance Rahul Dhesi's post to the GNU libc bug report
list: http://www.mail-archive.com/bug-glibc@gnu.org/msg07471.html

http://sources.redhat.com/bugzilla/show_bug.cgi?id=430

I have recently been burnt _again_ by this issue and I am more than
annoyed. If all that is missing is someone who hacks libc, I'll try my
best but I have little experience with RPC so I'm not sure if I can come
up with something quickly.

Cheers,

-- 
Matthias Andree

Encrypted mail welcome: my GnuPG key ID is 0x052E7D95 (PGP/MIME preferred)


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