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From: Ulrich Drepper <drepper@redhat.com> Date: 09 Jul 2000 14:18:27 -0700 Mark Kettenis <kettenis@wins.uva.nl> writes: > In the upgrade to BIND-8.2.2-P5, two symbols have been lost: > > 1. The variable _res_resultcodes. > > 2. The function __p_rr. > > So in principle the glibc 2.2 libresolv.so isn't binary compatible > with the one from glibc 2.1. These were rever exported. Therefore nothing has to be changed. Sorry, we have them in resolv/Versions, and nm /lib/libresolv-2.1.3.so gives: 00005784 T __p_rr 0000bb8c D _res_resultcodes Or do you mean that since these symbols start with an underscore, they're supposed to be only used internally? That's fine for these two, but for instance my /usr/bin/sendmail has: U __dn_skipname@@GLIBC_2.0 Which symbols got prefixed with a double underscore was arbitrarily decided by whatever was in the BIND 4.9.x imported into glibc 2.0. If the resolver interface has really been restricted to (the symbols that are marked #ifdef BIND_RES_POSIX3 in <resolv.h>): dn_expand(), res_init(), res_query(), res_search(), res_querydomain() and res_mkquery() up to now, why were virtually all symbols added to the version map in glibc 2.1? Moreover, BIND 4.9.7 adds res_send() to that list, and documents dn_comp (which still has a double underscore in reality) on its resolver.3 man page. Nowadays BIND 8 simply gives all symbols a double underscore, and documents even more interfaces. I'm certainly not against exporting a limited set of symbols, but we should take some care in choosing the set. At a minimum the symbols on the BIND 4.9.7 man page should be exported. If we can decide on a restricted set of symbols that will officially be exported from libresolv.so, I'm willing to document them. Mark
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