[Bug libc/28931] hosts lookup broken for SUCCESS=CONTINUE and SUCCESS=MERGE

[siddhesh at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28931

--- Comment #2 from Siddhesh Poyarekar <siddhesh at sourceware dot org> ---
(In reply to Siddhesh Poyarekar from comment #0)
> SUCCESS=MERGE should merge results from the previous and next module but
> that is broken with gethostbyname4_r, since it tries to allocate both into
> the same scratch buffer, overwriting the previous results.

Re-reading the manual, it looks like we require SUCCESS=merge to return lookup
failure for all but the groups database.

====
The @samp{merge} only applies to the @samp{success} status.  It is 
currently implemented for the @samp{group} database and its group  
members field, @samp{gr_mem}.  If specified for other databases, it
causes the lookup to fail (if the @var{status} matches).           
====

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