Today, Marcus Brinkmann ([EMAIL PROTECTED]) wrote:
# > GNU 0.2 (granite.man.uk.ekto.org init runs these programs,
# > # and restartsthem when th01) (console)
#
# Whop!!! (Eyes falling out)
Okay, having now looked at libshouldbeinlibc/localhost.c, I understand
your suprise at this.
The code snippet in question is:
do {
[Snip buffer (re)allocation stuff here]
} while((gethostname(buf, buf_len) == 0 && !memchr (buf, '\0', buf_len))
|| errno == ENAMETOOLONG);
Obviously the returned buffer must be null-terminated somewhere, else the
memchr() test would fail. gethostname() isn't failing, else this code
after the loop would kick in:
if (errno)
/* gethostname() failed, abort. */
{
free(buf);
buf = 0;
}
And my test calls to localhost() in an aptly-named foo.c (just a
printf() of the result) show no unusual behaviour.
Thus, I can only conclude that either:
- Something in getty is calling localhost() and munging the result
- gethostname() in some situations is returning garbage (this could be a
case of GIGO).
I can rule out the former based on the fact that the only thing using
localhost() in getty.c is:
char *hostname = localhost ();
cc = asprintf( ..., hostname?: "?", ... );
So, it appears to be some libc weirdness.
I've not looked in detail at a deeper level than this; how/why does the
hostname persist? I notice that it's exactly the same
munged text that appears after every reboot (and every log out, for that
matter), although I'm not sure if that's of any significance - I doubt it
is.
It does seem strange that this is limited to getty - I would've expected
weirdness elsewhere if it was a libc issue, although maybe I've just not
hit any yet.
As an aside, this may or may not have a bearing on things:
90% of what I'm running is straight from Marcus' tarball. The following
packages I've installed from /dist/sid/binary-i386-hurd on my friendly
debian mirror:
binutils_2.10.0.18-2.deb
cpp_2.95.2-14.deb
gcc_2.95-2-14.deb
gnumach-dev_1.2-3.deb
hurd-dev_20000803.deb
libc0.2-dev_2.1.3-10.deb
libc0.2_2.1.3-10.deb
make_3.79-2.deb
Plus, I've built from source:
inetutils-1.3.2
sh-utils-2.0
bash-2.03.0(1)
(And various other packages that I probably aren't relevant)
If anybody's running a pretty similar configuration, perhaps they could
try setting their hostname to something of a similar length? (to recap, my
hostname is set to 'granite.man.uk.ekto.org')
--
Mo McKinlay Chief Software Architect inter/open Labs
-------------------------------------------------------------------------
GnuPG Key: pub 1024D/76A275F9 2000-07-22 Mo McKinlay <[EMAIL PROTECTED]>
