On 18 Jul 1999, Dag-Erling Smorgrav wrote:
> Alfred Perlstein <[EMAIL PROTECTED]> writes:
> > On 18 Jul 1999, Dag-Erling Smorgrav wrote:
> > > Alfred Perlstein <[EMAIL PROTECTED]> writes:
> > > > I doubt this is
> > > > at all portable and may fail because of optimizations and ABI, such
> > > > as archs that store the return address in a register...
> > > I know - I don't expect it to be portable.
> > *slap* :)
>
> It's #ifdef'ed so you can drop it on platforms where it doesn't work :)
>
> > > > gdb and glibc have some functions to assist in runtime backtraces,
> > > > perhaps a look there may help?
> > > I found out about __builtin_return_address(0).
> > what is that? a function? available on freebsd?
>
> GCC builtin function.
>
> > by setting an alternate signal stack i think you can check
> > if you are in a signal using this. this may not be the best way
> > but it seems like a viable solution.
>
> Hmm, I ended up using a global variable which I increment at the
> beginning of the signal handler, and decrement at the end.
As long as you make sure the code won't have multiple access
that would work.
-Alfred
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