[lug] g++ signals and exceptions question

[Jonathan Briggs]

I should probably ask this question on one of the C++ newsgroups, but I
haven't had decent newsgroup access for a few months now.  On to the
question...

I was thinking that it would be pretty neat if a C++ program could catch
a signal and raise an exception.  I tried throwing an exception from a
signal handler, but that only resulted in a messy crash.  I'm sure this
is because signal handlers use a completely different program stack
while running.

Functions such as siglongjmp can manipulate the original program stack
and go somewhere else.  Does anyone know of a C++ (it can be g++ / Linux
specific) function or library that would allow raising an exception from
a signal handler?

If it doesn't exist, I might try writing it.

Do any of you who are experienced C++ programmers see anything wrong
with this idea?  One problem I thought of is that it might violate
exception restrictions (functions that declare they will never throw, or
will only throw exceptions of type int, for example.)
-- 
Jonathan Briggs
jbriggs at esoft.com
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