"TZ" and chroot() jails

[Philip Prindeville]

Hi.

I had a question:  after calling tzset(), is there a reliable way
to format the values of tzname[], daylight, and timezone into
a string to pass to setenv("TZ", ...) so that following a chroot(),
strftime() and localtime() continue to generate the correct
values?

Because I noticed that if you call tzset(), then chroot(), and
then any subsequent calls to tzset() happen (I think that
syslog() calls strftime_r() which calls tzset()), then the
subsequent calls to tzset() will clobber the previously good
values.

It's unfortunate that tzset() isn't idempotent following
initial success.

Thanks,

-Philip