> You mean SysV does not have C function for unsetting environment? I guess 
> this is why zsh has coded direct environ global manipulations (controlled by 
> USE_SET_UNSET_ENV). We can probably borrow code from there. I cannot say 
> though in which systems **environ is supported, but both bash and zsh just 
> use only the execve function out of exec* functions family: this means that 
> environment pointer is always passed directly (though with constructs like 
> `FOO=bar frobnicate` and `local -x` it would be strange to see something 
> else: it would be hard to constantly update global variable correctly).

To be more specific: there are two kinds of “direct environ manipulations”:

1. environ = new_environ,
2. envp = (environ [+ i]); *envp = string.

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