I have an embedded Linux with a write lock on all system folders (including /etc) and only one folder being freely writable, called /writable. /etc/localtime is a symbolic link that points to /writable/localtime.
My (test) application changes the timezone by copying a different timezone file into the location at /writable/localtime, then calls tzset() and tries to read tzname.
However regardless of whether I copy the timezone information or turn the file into a symlink pointing elsewhere, tzset does neither change tzname, nor does it update the offsets (meaning using localtime yields the same results).
Only after restarting the application, the new timezone takes effect.
Why?
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