Hello ISC,

we have trouble with exported getaddrinfo function (also getnameinfo,
freeaddrinfo, gai_strerror) from libirs. It is unclear to me why it
does export symbols without irs_ prefix and without its own header
file. I found some testing in configure script regarding salen
attribute. But it does not even test supported flags of system call.

What is reason to reimplement library call provided usually by libc
library? I think there might be some testing in configure script
whether getaddrinfo implementation is sufficient. If not, it might add
its own symbols. But I would prefer something like lwresd_getaddrinfo:
irs_getaddrinfo, maybe with possibility to define getaddrinfo define
from header. I miss at least manual configure option to disable it. I
suspect there is some reason for it. Is there functionality missing
from system libraries? Would it make sense to export irs_ prefixed
variants where own implementation is needed and use system functions in
the other case?

I have found libirs is usually used only by delv from bind package,
maybe to provide also verification. It is used also by DHCP server
however. But it prevents linking together with openldap library, which
is using flags that bind implementation does not support.

See https://bugzilla.redhat.com/show_bug.cgi?id=1205168

What is a reason to export system calls?

Best Regards,

--
Petr Menšík
Software Engineer
Red Hat, http://www.redhat.com/
email: pemensik@redhat.com  PGP: 65C6C973