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

[Adhemerval Zanella <adhemerval dot zanella at linaro dot org>]

On 14/03/2019 13:47, Paul Eggert wrote:
> 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.
> 

+1 on making this a tunable. Adding another configure switch means another
build permutation to check for consistency.