Newsgroup: comp.lang.perl

I want to be able to write C callback routines in Perl.  These
routines are called while some other C routine that implements a
Perl function is evaluated.  Does anyone have an idea of what value
should I give to the stack pointer in the C callback routine?
Currently I am setting a global variable to the value of the stack
pointer just before calling routines that might result in Perl
callbacks, but this is not very elegant.  I have also had a look
in the signal handler routine, but I got dizzy and anyway, I think 
it does a lot more than what I am trying to do.

Diomidis

PS I am quite aware of the phrase in perl-4.036/usub/README:

	It's not clear, for instance, how a given structure should be
	passed to Perl.  But that shouldn't bother you--if you've
	gotten this far, it's already obvious that you are totally
	mad.

-- 
Diomidis Spinellis    Internet: <dds@doc.ic.ac.uk>  UUCP: ...!uknet!icdoc!dds
Department of Computing, Imperial College, London SW7     #include "/dev/tty"

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