Hi! _nss_dns_gethostbyname* trusts getanswer_r to set *errnop and *h_errnop right (and from what I can see, at least for the too small buffer case it does the right thing), but _nss_dns_gethostbyaddr2_r will overwrite anything getanswer_r put into those variables with whatever h_errno/errno contain (which probably isn't related to the current error). I've tested it fixes the 258 PTR records getnameinfo query in BZ, though haven't done much testing beyond that. 2008-02-25 Jakub Jelinek <jakub@redhat.com> [BZ #5790] * resolv/nss_dns/dns-host.c (_nss_dns_gethostbyaddr2_r): Don't overwrite *h_errnop/*errnop values from getanswer_r in case of failure. --- libc/resolv/nss_dns/dns-host.c 30 Oct 2007 00:57:56 -0000 1.46 +++ libc/resolv/nss_dns/dns-host.c 25 Feb 2008 16:04:58 -0000 @@ -386,11 +386,7 @@ _nss_dns_gethostbyaddr2_r (const void *a if (host_buffer.buf != orig_host_buffer) free (host_buffer.buf); if (status != NSS_STATUS_SUCCESS) - { - *h_errnop = h_errno; - *errnop = errno; - return status; - } + return status; #ifdef SUNSECURITY This is not implemented because it is not possible to use the current Jakub