[PATCH] Fix multiple minor tzset glitches [BZ #24004]

[Paul Eggert]

On 3/14/19 7:10 AM, Florian Weimer wrote:
> * Paul Eggert:
>
>> Yes, and it would be good to add a way to control polling of /etc files,
>> and whatever method is used to control polling of /etc/nsswitch.conf
>> etc. could also be used to control polling of /etc/localtime.
> I think this should be a configuration file.  We can use a shared
> mapping (or use /etc/ld.so.cache) to make up-to-date checks really,
> really cheap.  But I think we should apply this mechanism only to files
> where the system administrator has enabled this feature.

Will the configuration file will have also an entry to control whether
the configuration file itself is polled? :-)

Come to think of it, this has the same feel as the other tunables, so
perhaps it'd be better to add it to the tunables feature. Something like
this:

export GLIBC_TUNABLES='glibc.etcpoll.nsswitch=1'

in order to enable polling of /etc/nsswitch.conf.