Milter-greylist

Quoting iewebguy <mark@...>:

>
>
> --- In milter-greylist@yahoogroups.com, Emmanuel Dreyfus <manu@n...>
> wrote:
>
> > key point is to link with a thread safe resolver. libspf and libspf_alt
> > make DNS querries within milter-greylist, and milter-greylist is a
> > threaded program. If the resolver is not thread safe, you crash at the
> > first time two thread make a DNS query at the same time
>
> How can I tell if I have a thread-safe resolver?  I am running a raq
> 550     (cobalt linux)

Try to find which glibc you have (rpm -qf /lib/libresolv.so may work)
and check through the installed doc or online docs (not the manpages
are most often with Linux it does not mention if a given function is MT safe)...
Last way out will be checking the glibc code ...
Libresolv in old versions of glibc was not thread-safe see
 http://cs-people.bu.edu/artdodge/linux/glibc/resolv/

Emmanuel, you might be interested in the following thread :
http://tinyurl.com/3whpd
Many Milters writers need to do DNS requests from their Milters ...
Milter is low level and a higher level interface offering DNS requests,
MIME decoding/altering would help a lot ...

SL/

PS : http://www.nongnu.org/ruli/ looks nice but is GPL Licensed (some
may say "infected" :-) ) SO I guess it cannot be used for avoiding
libresolv use.