[Bug nscd/13375] New: nscd inhibits HOSTALIASES envvar
matz at suse dot de
sourceware-bugzilla@sourceware.org
Wed Nov 2 15:36:00 GMT 2011
http://sourceware.org/bugzilla/show_bug.cgi?id=13375
Bug #: 13375
Summary: nscd inhibits HOSTALIASES envvar
Product: glibc
Version: 2.14
Status: NEW
Severity: normal
Priority: P2
Component: nscd
AssignedTo: drepper.fsp@gmail.com
ReportedBy: matz@suse.de
Classification: Unclassified
Make sure nscd is running and indeed caching hosts database lookups (not the
case with debian for instance), then:
% HOSTALIASES=./fooalias strace getent hosts bla 2>&1 | grep fooalias
shows that the file isn't accessed. It is accessed if nscd isn't running
(and in that case is correctly interpreted). getent is just a convenient
shorthand for a testcase, the gethostbyname interface behaves the same,
i.e. doesn't lookup HOSTALIASES files when nscd is running. But according
to the manpage it should. I think it's an extension, not POSIX behaviour,
but one side needs to be fixed, either docu or code.
FWIW, the environment variable isn't respected because res_hostalias
isn't called, because __libc_res_nquery isn't called, because the
nscd-accessing routines are called first.
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