longjmp and state

[LEGO <luis.ontanon@...>]

Hi,
Lately I been working into embedding Lua into ethereal
(http://www.ethereal.com).
In ethereal we use longjmps to fallback from a dissector that has failed.

So I have a question regarding the impact of these longjmps would have
to the lua machine.

If a routime called by a lua_CFunction longjmps way back (bellow the
point where the lua machine  was called) would the lua machine be
still usable?

If it doesn't, Is there a way to protect  the machine from such
backward jumps .

Thanks.

Luis
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