[Bug libc/984] Respond to changed resolv.conf in gethostbyname

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=984

--- Comment #8 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Carlos O'Donell from comment #7)

> How is that a problem in glibc if sendmail caches the resolver? Or are you
> saying something else? That libc.so.6 caches the resolvers and fails to call
> out to nscd? That would be a real bug, and we'd like to see some kind of
> reproducer for that if possible, so we can fix the issue.

sendmail needs to do MX lookups, so it uses res_query (and res_search,
depending on the context) and not one of the getaddrinfo/get*by* functions. 
It's also a forking daemon.  It initializes the glibc resolver before forking,
and I assume all the child processes inherit the cached list of name servers.

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