[luatex] os.setenv and getenv

[Dirk Laurie]

2013/8/8 Norbert Preining <preining at logic.at>:

> Once more: It seems that the os.setenv function does not have an
> effect on the running process on Windows, only on child process?

Is that really Windows-specific? Thinking in Lua terms, environment
variables are like Lua upvalues, they belong one level higher up,
and they must be read-only, otherwise a running process can queer
the pitch for other processes started in the same environment.