[PATCH,HURD] hurd: compliance fixes for ptsname_r

[Pino Toscano]

Hi,

Alle venerdì 20 luglio 2012, Roland McGrath ha scritto:
> > Ok, I see that its `buf' argument is marked nonnull. I added that
> > check because I saw the gnulib test for it explicitly checking
> > that ptsname_r(fd, NULL, 0) would be properly failing with EINVAL
> > (and the man page even explicitly mention that return value,
> > unlike with basically most of the other functions). Should gnulib
> > do that check only on Linux, then?
> 
> Well, everybody's wrong.  The libc manual never said that you can
> pass NULL and expect not to crash, and the man page was IMHO wrong
> to document it that way.  The other implementations never should
> have checked for NULL, but they have done so for a long time. 
> gnulib never should have passed NULL to this function and IMHO it
> should be fixed not to do so. But given the history, the least of
> avaialble evils is to make the Hurd implementation consistent with
> the others and do the check.

(few months later... I forgot I sent this patch, so I'm bring it again.)

I updated the patch; is it okay to commit, or should I bring back the 
buf==NULL check?

-- 
Pino Toscano
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